Vendor import (really!) of the OpenSolaris bits for DTrace.

18 files changed, 25785 insertions, 0 deletions

diff --git a/cddl/contrib/opensolaris/uts/common/ctf/ctf_mod.c b/cddl/contrib/opensolaris/uts/common/ctf/ctf_mod.c
new file mode 100644
index 0000000..b34cf40
--- /dev/null
+++ b/cddl/contrib/opensolaris/uts/common/ctf/ctf_mod.c
@@ -0,0 +1,177 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2003 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <sys/sysmacros.h>
+#include <sys/modctl.h>
+#include <sys/debug.h>
+#include <sys/mman.h>
+#include <sys/modctl.h>
+#include <sys/kobj.h>
+#include <ctf_impl.h>
+
+int ctf_leave_compressed = 0;
+
+static struct modlmisc modlmisc = {
+	&mod_miscops, "Compact C Type Format routines"
+};
+
+static struct modlinkage modlinkage = {
+	MODREV_1, &modlmisc, NULL
+};
+
+int
+_init(void)
+{
+	return (mod_install(&modlinkage));
+}
+
+int
+_info(struct modinfo *mip)
+{
+	return (mod_info(&modlinkage, mip));
+}
+
+int
+_fini(void)
+{
+	return (mod_remove(&modlinkage));
+}
+
+/*ARGSUSED*/
+void *
+ctf_zopen(int *errp)
+{
+	return ((void *)1); /* zmod is always loaded because we depend on it */
+}
+
+/*ARGSUSED*/
+const void *
+ctf_sect_mmap(ctf_sect_t *sp, int fd)
+{
+	return (MAP_FAILED); /* we don't support this in the kernel */
+}
+
+/*ARGSUSED*/
+void
+ctf_sect_munmap(const ctf_sect_t *sp)
+{
+	/* we don't support this in the kernel */
+}
+
+/*ARGSUSED*/
+ctf_file_t *
+ctf_fdopen(int fd, int *errp)
+{
+	return (ctf_set_open_errno(errp, ENOTSUP));
+}
+
+/*ARGSUSED*/
+ctf_file_t *
+ctf_open(const char *filename, int *errp)
+{
+	return (ctf_set_open_errno(errp, ENOTSUP));
+}
+
+/*ARGSUSED*/
+int
+ctf_write(ctf_file_t *fp, int fd)
+{
+	return (ctf_set_errno(fp, ENOTSUP));
+}
+
+int
+ctf_version(int version)
+{
+	ASSERT(version > 0 && version <= CTF_VERSION);
+
+	if (version > 0)
+		_libctf_version = MIN(CTF_VERSION, version);
+
+	return (_libctf_version);
+}
+
+/*ARGSUSED*/
+ctf_file_t *
+ctf_modopen(struct module *mp, int *error)
+{
+	ctf_sect_t ctfsect, symsect, strsect;
+	ctf_file_t *fp = NULL;
+	int err;
+
+	if (error == NULL)
+		error = &err;
+
+	ctfsect.cts_name = ".SUNW_ctf";
+	ctfsect.cts_type = SHT_PROGBITS;
+	ctfsect.cts_flags = SHF_ALLOC;
+	ctfsect.cts_data = mp->ctfdata;
+	ctfsect.cts_size = mp->ctfsize;
+	ctfsect.cts_entsize = 1;
+	ctfsect.cts_offset = 0;
+
+	symsect.cts_name = ".symtab";
+	symsect.cts_type = SHT_SYMTAB;
+	symsect.cts_flags = 0;
+	symsect.cts_data = mp->symtbl;
+	symsect.cts_size = mp->symhdr->sh_size;
+#ifdef _LP64
+	symsect.cts_entsize = sizeof (Elf64_Sym);
+#else
+	symsect.cts_entsize = sizeof (Elf32_Sym);
+#endif
+	symsect.cts_offset = 0;
+
+	strsect.cts_name = ".strtab";
+	strsect.cts_type = SHT_STRTAB;
+	strsect.cts_flags = 0;
+	strsect.cts_data = mp->strings;
+	strsect.cts_size = mp->strhdr->sh_size;
+	strsect.cts_entsize = 1;
+	strsect.cts_offset = 0;
+
+	ASSERT(MUTEX_HELD(&mod_lock));
+
+	if ((fp = ctf_bufopen(&ctfsect, &symsect, &strsect, error)) == NULL)
+		return (NULL);
+
+	if (!ctf_leave_compressed && (caddr_t)fp->ctf_base != mp->ctfdata) {
+		/*
+		 * We must have just uncompressed the CTF data.  To avoid
+		 * others having to pay the (substantial) cost of decompressing
+		 * the data, we're going to substitute the uncompressed version
+		 * for the compressed version.  Note that this implies that the
+		 * first CTF consumer will induce memory impact on the system
+		 * (but in the name of performance of future CTF consumers).
+		 */
+		kobj_set_ctf(mp, (caddr_t)fp->ctf_base, fp->ctf_size);
+		fp->ctf_data.cts_data = fp->ctf_base;
+		fp->ctf_data.cts_size = fp->ctf_size;
+	}
+
+	return (fp);
+}
diff --git a/cddl/contrib/opensolaris/uts/common/ctf/ctf_subr.c b/cddl/contrib/opensolaris/uts/common/ctf/ctf_subr.c
new file mode 100644
index 0000000..cd0a828
--- /dev/null
+++ b/cddl/contrib/opensolaris/uts/common/ctf/ctf_subr.c
@@ -0,0 +1,96 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <ctf_impl.h>
+#include <sys/kobj.h>
+#include <sys/kobj_impl.h>
+
+/*
+ * This module is used both during the normal operation of the kernel (i.e.
+ * after kmem has been initialized) and during boot (before unix`_start has
+ * been called).  kobj_alloc is able to tell the difference between the two
+ * cases, and as such must be used instead of kmem_alloc.
+ */
+
+void *
+ctf_data_alloc(size_t size)
+{
+	void *buf = kobj_alloc(size, KM_NOWAIT|KM_SCRATCH);
+
+	if (buf == NULL)
+		return (MAP_FAILED);
+
+	return (buf);
+}
+
+void
+ctf_data_free(void *buf, size_t size)
+{
+	kobj_free(buf, size);
+}
+
+/*ARGSUSED*/
+void
+ctf_data_protect(void *buf, size_t size)
+{
+	/* we don't support this operation in the kernel */
+}
+
+void *
+ctf_alloc(size_t size)
+{
+	return (kobj_alloc(size, KM_NOWAIT|KM_TMP));
+}
+
+/*ARGSUSED*/
+void
+ctf_free(void *buf, size_t size)
+{
+	kobj_free(buf, size);
+}
+
+/*ARGSUSED*/
+const char *
+ctf_strerror(int err)
+{
+	return (NULL); /* we don't support this operation in the kernel */
+}
+
+/*PRINTFLIKE1*/
+void
+ctf_dprintf(const char *format, ...)
+{
+	if (_libctf_debug) {
+		va_list alist;
+
+		va_start(alist, format);
+		(void) printf("ctf DEBUG: ");
+		(void) vprintf(format, alist);
+		va_end(alist);
+	}
+}
diff --git a/cddl/contrib/opensolaris/uts/common/dtrace/dtrace.c b/cddl/contrib/opensolaris/uts/common/dtrace/dtrace.c
new file mode 100644
index 0000000..35971db
--- /dev/null
+++ b/cddl/contrib/opensolaris/uts/common/dtrace/dtrace.c
@@ -0,0 +1,15521 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+/*
+ * DTrace - Dynamic Tracing for Solaris
+ *
+ * This is the implementation of the Solaris Dynamic Tracing framework
+ * (DTrace).  The user-visible interface to DTrace is described at length in
+ * the "Solaris Dynamic Tracing Guide".  The interfaces between the libdtrace
+ * library, the in-kernel DTrace framework, and the DTrace providers are
+ * described in the block comments in the <sys/dtrace.h> header file.  The
+ * internal architecture of DTrace is described in the block comments in the
+ * <sys/dtrace_impl.h> header file.  The comments contained within the DTrace
+ * implementation very much assume mastery of all of these sources; if one has
+ * an unanswered question about the implementation, one should consult them
+ * first.
+ *
+ * The functions here are ordered roughly as follows:
+ *
+ *   - Probe context functions
+ *   - Probe hashing functions
+ *   - Non-probe context utility functions
+ *   - Matching functions
+ *   - Provider-to-Framework API functions
+ *   - Probe management functions
+ *   - DIF object functions
+ *   - Format functions
+ *   - Predicate functions
+ *   - ECB functions
+ *   - Buffer functions
+ *   - Enabling functions
+ *   - DOF functions
+ *   - Anonymous enabling functions
+ *   - Consumer state functions
+ *   - Helper functions
+ *   - Hook functions
+ *   - Driver cookbook functions
+ *
+ * Each group of functions begins with a block comment labelled the "DTrace
+ * [Group] Functions", allowing one to find each block by searching forward
+ * on capital-f functions.
+ */
+#include <sys/errno.h>
+#include <sys/stat.h>
+#include <sys/modctl.h>
+#include <sys/conf.h>
+#include <sys/systm.h>
+#include <sys/ddi.h>
+#include <sys/sunddi.h>
+#include <sys/cpuvar.h>
+#include <sys/kmem.h>
+#include <sys/strsubr.h>
+#include <sys/sysmacros.h>
+#include <sys/dtrace_impl.h>
+#include <sys/atomic.h>
+#include <sys/cmn_err.h>
+#include <sys/mutex_impl.h>
+#include <sys/rwlock_impl.h>
+#include <sys/ctf_api.h>
+#include <sys/panic.h>
+#include <sys/priv_impl.h>
+#include <sys/policy.h>
+#include <sys/cred_impl.h>
+#include <sys/procfs_isa.h>
+#include <sys/taskq.h>
+#include <sys/mkdev.h>
+#include <sys/kdi.h>
+#include <sys/zone.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+/*
+ * DTrace Tunable Variables
+ *
+ * The following variables may be tuned by adding a line to /etc/system that
+ * includes both the name of the DTrace module ("dtrace") and the name of the
+ * variable.  For example:
+ *
+ *   set dtrace:dtrace_destructive_disallow = 1
+ *
+ * In general, the only variables that one should be tuning this way are those
+ * that affect system-wide DTrace behavior, and for which the default behavior
+ * is undesirable.  Most of these variables are tunable on a per-consumer
+ * basis using DTrace options, and need not be tuned on a system-wide basis.
+ * When tuning these variables, avoid pathological values; while some attempt
+ * is made to verify the integrity of these variables, they are not considered
+ * part of the supported interface to DTrace, and they are therefore not
+ * checked comprehensively.  Further, these variables should not be tuned
+ * dynamically via "mdb -kw" or other means; they should only be tuned via
+ * /etc/system.
+ */
+int		dtrace_destructive_disallow = 0;
+dtrace_optval_t	dtrace_nonroot_maxsize = (16 * 1024 * 1024);
+size_t		dtrace_difo_maxsize = (256 * 1024);
+dtrace_optval_t	dtrace_dof_maxsize = (256 * 1024);
+size_t		dtrace_global_maxsize = (16 * 1024);
+size_t		dtrace_actions_max = (16 * 1024);
+size_t		dtrace_retain_max = 1024;
+dtrace_optval_t	dtrace_helper_actions_max = 32;
+dtrace_optval_t	dtrace_helper_providers_max = 32;
+dtrace_optval_t	dtrace_dstate_defsize = (1 * 1024 * 1024);
+size_t		dtrace_strsize_default = 256;
+dtrace_optval_t	dtrace_cleanrate_default = 9900990;		/* 101 hz */
+dtrace_optval_t	dtrace_cleanrate_min = 200000;			/* 5000 hz */
+dtrace_optval_t	dtrace_cleanrate_max = (uint64_t)60 * NANOSEC;	/* 1/minute */
+dtrace_optval_t	dtrace_aggrate_default = NANOSEC;		/* 1 hz */
+dtrace_optval_t	dtrace_statusrate_default = NANOSEC;		/* 1 hz */
+dtrace_optval_t dtrace_statusrate_max = (hrtime_t)10 * NANOSEC;	 /* 6/minute */
+dtrace_optval_t	dtrace_switchrate_default = NANOSEC;		/* 1 hz */
+dtrace_optval_t	dtrace_nspec_default = 1;
+dtrace_optval_t	dtrace_specsize_default = 32 * 1024;
+dtrace_optval_t dtrace_stackframes_default = 20;
+dtrace_optval_t dtrace_ustackframes_default = 20;
+dtrace_optval_t dtrace_jstackframes_default = 50;
+dtrace_optval_t dtrace_jstackstrsize_default = 512;
+int		dtrace_msgdsize_max = 128;
+hrtime_t	dtrace_chill_max = 500 * (NANOSEC / MILLISEC);	/* 500 ms */
+hrtime_t	dtrace_chill_interval = NANOSEC;		/* 1000 ms */
+int		dtrace_devdepth_max = 32;
+int		dtrace_err_verbose;
+hrtime_t	dtrace_deadman_interval = NANOSEC;
+hrtime_t	dtrace_deadman_timeout = (hrtime_t)10 * NANOSEC;
+hrtime_t	dtrace_deadman_user = (hrtime_t)30 * NANOSEC;
+
+/*
+ * DTrace External Variables
+ *
+ * As dtrace(7D) is a kernel module, any DTrace variables are obviously
+ * available to DTrace consumers via the backtick (`) syntax.  One of these,
+ * dtrace_zero, is made deliberately so:  it is provided as a source of
+ * well-known, zero-filled memory.  While this variable is not documented,
+ * it is used by some translators as an implementation detail.
+ */
+const char	dtrace_zero[256] = { 0 };	/* zero-filled memory */
+
+/*
+ * DTrace Internal Variables
+ */
+static dev_info_t	*dtrace_devi;		/* device info */
+static vmem_t		*dtrace_arena;		/* probe ID arena */
+static vmem_t		*dtrace_minor;		/* minor number arena */
+static taskq_t		*dtrace_taskq;		/* task queue */
+static dtrace_probe_t	**dtrace_probes;	/* array of all probes */
+static int		dtrace_nprobes;		/* number of probes */
+static dtrace_provider_t *dtrace_provider;	/* provider list */
+static dtrace_meta_t	*dtrace_meta_pid;	/* user-land meta provider */
+static int		dtrace_opens;		/* number of opens */
+static int		dtrace_helpers;		/* number of helpers */
+static void		*dtrace_softstate;	/* softstate pointer */
+static dtrace_hash_t	*dtrace_bymod;		/* probes hashed by module */
+static dtrace_hash_t	*dtrace_byfunc;		/* probes hashed by function */
+static dtrace_hash_t	*dtrace_byname;		/* probes hashed by name */
+static dtrace_toxrange_t *dtrace_toxrange;	/* toxic range array */
+static int		dtrace_toxranges;	/* number of toxic ranges */
+static int		dtrace_toxranges_max;	/* size of toxic range array */
+static dtrace_anon_t	dtrace_anon;		/* anonymous enabling */
+static kmem_cache_t	*dtrace_state_cache;	/* cache for dynamic state */
+static uint64_t		dtrace_vtime_references; /* number of vtimestamp refs */
+static kthread_t	*dtrace_panicked;	/* panicking thread */
+static dtrace_ecb_t	*dtrace_ecb_create_cache; /* cached created ECB */
+static dtrace_genid_t	dtrace_probegen;	/* current probe generation */
+static dtrace_helpers_t *dtrace_deferred_pid;	/* deferred helper list */
+static dtrace_enabling_t *dtrace_retained;	/* list of retained enablings */
+static dtrace_dynvar_t	dtrace_dynhash_sink;	/* end of dynamic hash chains */
+
+/*
+ * DTrace Locking
+ * DTrace is protected by three (relatively coarse-grained) locks:
+ *
+ * (1) dtrace_lock is required to manipulate essentially any DTrace state,
+ *     including enabling state, probes, ECBs, consumer state, helper state,
+ *     etc.  Importantly, dtrace_lock is _not_ required when in probe context;
+ *     probe context is lock-free -- synchronization is handled via the
+ *     dtrace_sync() cross call mechanism.
+ *
+ * (2) dtrace_provider_lock is required when manipulating provider state, or
+ *     when provider state must be held constant.
+ *
+ * (3) dtrace_meta_lock is required when manipulating meta provider state, or
+ *     when meta provider state must be held constant.
+ *
+ * The lock ordering between these three locks is dtrace_meta_lock before
+ * dtrace_provider_lock before dtrace_lock.  (In particular, there are
+ * several places where dtrace_provider_lock is held by the framework as it
+ * calls into the providers -- which then call back into the framework,
+ * grabbing dtrace_lock.)
+ *
+ * There are two other locks in the mix:  mod_lock and cpu_lock.  With respect
+ * to dtrace_provider_lock and dtrace_lock, cpu_lock continues its historical
+ * role as a coarse-grained lock; it is acquired before both of these locks.
+ * With respect to dtrace_meta_lock, its behavior is stranger:  cpu_lock must
+ * be acquired _between_ dtrace_meta_lock and any other DTrace locks.
+ * mod_lock is similar with respect to dtrace_provider_lock in that it must be
+ * acquired _between_ dtrace_provider_lock and dtrace_lock.
+ */
+static kmutex_t		dtrace_lock;		/* probe state lock */
+static kmutex_t		dtrace_provider_lock;	/* provider state lock */
+static kmutex_t		dtrace_meta_lock;	/* meta-provider state lock */
+
+/*
+ * DTrace Provider Variables
+ *
+ * These are the variables relating to DTrace as a provider (that is, the
+ * provider of the BEGIN, END, and ERROR probes).
+ */
+static dtrace_pattr_t	dtrace_provider_attr = {
+{ DTRACE_STABILITY_STABLE, DTRACE_STABILITY_STABLE, DTRACE_CLASS_COMMON },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_STABLE, DTRACE_STABILITY_STABLE, DTRACE_CLASS_COMMON },
+{ DTRACE_STABILITY_STABLE, DTRACE_STABILITY_STABLE, DTRACE_CLASS_COMMON },
+};
+
+static void
+dtrace_nullop(void)
+{}
+
+static dtrace_pops_t	dtrace_provider_ops = {
+	(void (*)(void *, const dtrace_probedesc_t *))dtrace_nullop,
+	(void (*)(void *, struct modctl *))dtrace_nullop,
+	(void (*)(void *, dtrace_id_t, void *))dtrace_nullop,
+	(void (*)(void *, dtrace_id_t, void *))dtrace_nullop,
+	(void (*)(void *, dtrace_id_t, void *))dtrace_nullop,
+	(void (*)(void *, dtrace_id_t, void *))dtrace_nullop,
+	NULL,
+	NULL,
+	NULL,
+	(void (*)(void *, dtrace_id_t, void *))dtrace_nullop
+};
+
+static dtrace_id_t	dtrace_probeid_begin;	/* special BEGIN probe */
+static dtrace_id_t	dtrace_probeid_end;	/* special END probe */
+dtrace_id_t		dtrace_probeid_error;	/* special ERROR probe */
+
+/*
+ * DTrace Helper Tracing Variables
+ */
+uint32_t dtrace_helptrace_next = 0;
+uint32_t dtrace_helptrace_nlocals;
+char	*dtrace_helptrace_buffer;
+int	dtrace_helptrace_bufsize = 512 * 1024;
+
+#ifdef DEBUG
+int	dtrace_helptrace_enabled = 1;
+#else
+int	dtrace_helptrace_enabled = 0;
+#endif
+
+/*
+ * DTrace Error Hashing
+ *
+ * On DEBUG kernels, DTrace will track the errors that has seen in a hash
+ * table.  This is very useful for checking coverage of tests that are
+ * expected to induce DIF or DOF processing errors, and may be useful for
+ * debugging problems in the DIF code generator or in DOF generation .  The
+ * error hash may be examined with the ::dtrace_errhash MDB dcmd.
+ */
+#ifdef DEBUG
+static dtrace_errhash_t	dtrace_errhash[DTRACE_ERRHASHSZ];
+static const char *dtrace_errlast;
+static kthread_t *dtrace_errthread;
+static kmutex_t dtrace_errlock;
+#endif
+
+/*
+ * DTrace Macros and Constants
+ *
+ * These are various macros that are useful in various spots in the
+ * implementation, along with a few random constants that have no meaning
+ * outside of the implementation.  There is no real structure to this cpp
+ * mishmash -- but is there ever?
+ */
+#define	DTRACE_HASHSTR(hash, probe)	\
+	dtrace_hash_str(*((char **)((uintptr_t)(probe) + (hash)->dth_stroffs)))
+
+#define	DTRACE_HASHNEXT(hash, probe)	\
+	(dtrace_probe_t **)((uintptr_t)(probe) + (hash)->dth_nextoffs)
+
+#define	DTRACE_HASHPREV(hash, probe)	\
+	(dtrace_probe_t **)((uintptr_t)(probe) + (hash)->dth_prevoffs)
+
+#define	DTRACE_HASHEQ(hash, lhs, rhs)	\
+	(strcmp(*((char **)((uintptr_t)(lhs) + (hash)->dth_stroffs)), \
+	    *((char **)((uintptr_t)(rhs) + (hash)->dth_stroffs))) == 0)
+
+#define	DTRACE_AGGHASHSIZE_SLEW		17
+
+#define	DTRACE_V4MAPPED_OFFSET		(sizeof (uint32_t) * 3)
+
+/*
+ * The key for a thread-local variable consists of the lower 61 bits of the
+ * t_did, plus the 3 bits of the highest active interrupt above LOCK_LEVEL.
+ * We add DIF_VARIABLE_MAX to t_did to assure that the thread key is never
+ * equal to a variable identifier.  This is necessary (but not sufficient) to
+ * assure that global associative arrays never collide with thread-local
+ * variables.  To guarantee that they cannot collide, we must also define the
+ * order for keying dynamic variables.  That order is:
+ *
+ *   [ key0 ] ... [ keyn ] [ variable-key ] [ tls-key ]
+ *
+ * Because the variable-key and the tls-key are in orthogonal spaces, there is
+ * no way for a global variable key signature to match a thread-local key
+ * signature.
+ */
+#define	DTRACE_TLS_THRKEY(where) { \
+	uint_t intr = 0; \
+	uint_t actv = CPU->cpu_intr_actv >> (LOCK_LEVEL + 1); \
+	for (; actv; actv >>= 1) \
+		intr++; \
+	ASSERT(intr < (1 << 3)); \
+	(where) = ((curthread->t_did + DIF_VARIABLE_MAX) & \
+	    (((uint64_t)1 << 61) - 1)) | ((uint64_t)intr << 61); \
+}
+
+#define	DT_BSWAP_8(x)	((x) & 0xff)
+#define	DT_BSWAP_16(x)	((DT_BSWAP_8(x) << 8) | DT_BSWAP_8((x) >> 8))
+#define	DT_BSWAP_32(x)	((DT_BSWAP_16(x) << 16) | DT_BSWAP_16((x) >> 16))
+#define	DT_BSWAP_64(x)	((DT_BSWAP_32(x) << 32) | DT_BSWAP_32((x) >> 32))
+
+#define	DT_MASK_LO 0x00000000FFFFFFFFULL
+
+#define	DTRACE_STORE(type, tomax, offset, what) \
+	*((type *)((uintptr_t)(tomax) + (uintptr_t)offset)) = (type)(what);
+
+#ifndef __i386
+#define	DTRACE_ALIGNCHECK(addr, size, flags)				\
+	if (addr & (size - 1)) {					\
+		*flags |= CPU_DTRACE_BADALIGN;				\
+		cpu_core[CPU->cpu_id].cpuc_dtrace_illval = addr;	\
+		return (0);						\
+	}
+#else
+#define	DTRACE_ALIGNCHECK(addr, size, flags)
+#endif
+
+/*
+ * Test whether a range of memory starting at testaddr of size testsz falls
+ * within the range of memory described by addr, sz.  We take care to avoid
+ * problems with overflow and underflow of the unsigned quantities, and
+ * disallow all negative sizes.  Ranges of size 0 are allowed.
+ */
+#define	DTRACE_INRANGE(testaddr, testsz, baseaddr, basesz) \
+	((testaddr) - (baseaddr) < (basesz) && \
+	(testaddr) + (testsz) - (baseaddr) <= (basesz) && \
+	(testaddr) + (testsz) >= (testaddr))
+
+/*
+ * Test whether alloc_sz bytes will fit in the scratch region.  We isolate
+ * alloc_sz on the righthand side of the comparison in order to avoid overflow
+ * or underflow in the comparison with it.  This is simpler than the INRANGE
+ * check above, because we know that the dtms_scratch_ptr is valid in the
+ * range.  Allocations of size zero are allowed.
+ */
+#define	DTRACE_INSCRATCH(mstate, alloc_sz) \
+	((mstate)->dtms_scratch_base + (mstate)->dtms_scratch_size - \
+	(mstate)->dtms_scratch_ptr >= (alloc_sz))
+
+#define	DTRACE_LOADFUNC(bits)						\
+/*CSTYLED*/								\
+uint##bits##_t								\
+dtrace_load##bits(uintptr_t addr)					\
+{									\
+	size_t size = bits / NBBY;					\
+	/*CSTYLED*/							\
+	uint##bits##_t rval;						\
+	int i;								\
+	volatile uint16_t *flags = (volatile uint16_t *)		\
+	    &cpu_core[CPU->cpu_id].cpuc_dtrace_flags;			\
+									\
+	DTRACE_ALIGNCHECK(addr, size, flags);				\
+									\
+	for (i = 0; i < dtrace_toxranges; i++) {			\
+		if (addr >= dtrace_toxrange[i].dtt_limit)		\
+			continue;					\
+									\
+		if (addr + size <= dtrace_toxrange[i].dtt_base)		\
+			continue;					\
+									\
+		/*							\
+		 * This address falls within a toxic region; return 0.	\
+		 */							\
+		*flags |= CPU_DTRACE_BADADDR;				\
+		cpu_core[CPU->cpu_id].cpuc_dtrace_illval = addr;	\
+		return (0);						\
+	}								\
+									\
+	*flags |= CPU_DTRACE_NOFAULT;					\
+	/*CSTYLED*/							\
+	rval = *((volatile uint##bits##_t *)addr);			\
+	*flags &= ~CPU_DTRACE_NOFAULT;					\
+									\
+	return (!(*flags & CPU_DTRACE_FAULT) ? rval : 0);		\
+}
+
+#ifdef _LP64
+#define	dtrace_loadptr	dtrace_load64
+#else
+#define	dtrace_loadptr	dtrace_load32
+#endif
+
+#define	DTRACE_DYNHASH_FREE	0
+#define	DTRACE_DYNHASH_SINK	1
+#define	DTRACE_DYNHASH_VALID	2
+
+#define	DTRACE_MATCH_NEXT	0
+#define	DTRACE_MATCH_DONE	1
+#define	DTRACE_ANCHORED(probe)	((probe)->dtpr_func[0] != '\0')
+#define	DTRACE_STATE_ALIGN	64
+
+#define	DTRACE_FLAGS2FLT(flags)						\
+	(((flags) & CPU_DTRACE_BADADDR) ? DTRACEFLT_BADADDR :		\
+	((flags) & CPU_DTRACE_ILLOP) ? DTRACEFLT_ILLOP :		\
+	((flags) & CPU_DTRACE_DIVZERO) ? DTRACEFLT_DIVZERO :		\
+	((flags) & CPU_DTRACE_KPRIV) ? DTRACEFLT_KPRIV :		\
+	((flags) & CPU_DTRACE_UPRIV) ? DTRACEFLT_UPRIV :		\
+	((flags) & CPU_DTRACE_TUPOFLOW) ?  DTRACEFLT_TUPOFLOW :		\
+	((flags) & CPU_DTRACE_BADALIGN) ?  DTRACEFLT_BADALIGN :		\
+	((flags) & CPU_DTRACE_NOSCRATCH) ?  DTRACEFLT_NOSCRATCH :	\
+	((flags) & CPU_DTRACE_BADSTACK) ?  DTRACEFLT_BADSTACK :		\
+	DTRACEFLT_UNKNOWN)
+
+#define	DTRACEACT_ISSTRING(act)						\
+	((act)->dta_kind == DTRACEACT_DIFEXPR &&			\
+	(act)->dta_difo->dtdo_rtype.dtdt_kind == DIF_TYPE_STRING)
+
+static size_t dtrace_strlen(const char *, size_t);
+static dtrace_probe_t *dtrace_probe_lookup_id(dtrace_id_t id);
+static void dtrace_enabling_provide(dtrace_provider_t *);
+static int dtrace_enabling_match(dtrace_enabling_t *, int *);
+static void dtrace_enabling_matchall(void);
+static dtrace_state_t *dtrace_anon_grab(void);
+static uint64_t dtrace_helper(int, dtrace_mstate_t *,
+    dtrace_state_t *, uint64_t, uint64_t);
+static dtrace_helpers_t *dtrace_helpers_create(proc_t *);
+static void dtrace_buffer_drop(dtrace_buffer_t *);
+static intptr_t dtrace_buffer_reserve(dtrace_buffer_t *, size_t, size_t,
+    dtrace_state_t *, dtrace_mstate_t *);
+static int dtrace_state_option(dtrace_state_t *, dtrace_optid_t,
+    dtrace_optval_t);
+static int dtrace_ecb_create_enable(dtrace_probe_t *, void *);
+static void dtrace_helper_provider_destroy(dtrace_helper_provider_t *);
+
+/*
+ * DTrace Probe Context Functions
+ *
+ * These functions are called from probe context.  Because probe context is
+ * any context in which C may be called, arbitrarily locks may be held,
+ * interrupts may be disabled, we may be in arbitrary dispatched state, etc.
+ * As a result, functions called from probe context may only call other DTrace
+ * support functions -- they may not interact at all with the system at large.
+ * (Note that the ASSERT macro is made probe-context safe by redefining it in
+ * terms of dtrace_assfail(), a probe-context safe function.) If arbitrary
+ * loads are to be performed from probe context, they _must_ be in terms of
+ * the safe dtrace_load*() variants.
+ *
+ * Some functions in this block are not actually called from probe context;
+ * for these functions, there will be a comment above the function reading
+ * "Note:  not called from probe context."
+ */
+void
+dtrace_panic(const char *format, ...)
+{
+	va_list alist;
+
+	va_start(alist, format);
+	dtrace_vpanic(format, alist);
+	va_end(alist);
+}
+
+int
+dtrace_assfail(const char *a, const char *f, int l)
+{
+	dtrace_panic("assertion failed: %s, file: %s, line: %d", a, f, l);
+
+	/*
+	 * We just need something here that even the most clever compiler
+	 * cannot optimize away.
+	 */
+	return (a[(uintptr_t)f]);
+}
+
+/*
+ * Atomically increment a specified error counter from probe context.
+ */
+static void
+dtrace_error(uint32_t *counter)
+{
+	/*
+	 * Most counters stored to in probe context are per-CPU counters.
+	 * However, there are some error conditions that are sufficiently
+	 * arcane that they don't merit per-CPU storage.  If these counters
+	 * are incremented concurrently on different CPUs, scalability will be
+	 * adversely affected -- but we don't expect them to be white-hot in a
+	 * correctly constructed enabling...
+	 */
+	uint32_t oval, nval;
+
+	do {
+		oval = *counter;
+
+		if ((nval = oval + 1) == 0) {
+			/*
+			 * If the counter would wrap, set it to 1 -- assuring
+			 * that the counter is never zero when we have seen
+			 * errors.  (The counter must be 32-bits because we
+			 * aren't guaranteed a 64-bit compare&swap operation.)
+			 * To save this code both the infamy of being fingered
+			 * by a priggish news story and the indignity of being
+			 * the target of a neo-puritan witch trial, we're
+			 * carefully avoiding any colorful description of the
+			 * likelihood of this condition -- but suffice it to
+			 * say that it is only slightly more likely than the
+			 * overflow of predicate cache IDs, as discussed in
+			 * dtrace_predicate_create().
+			 */
+			nval = 1;
+		}
+	} while (dtrace_cas32(counter, oval, nval) != oval);
+}
+
+/*
+ * Use the DTRACE_LOADFUNC macro to define functions for each of loading a
+ * uint8_t, a uint16_t, a uint32_t and a uint64_t.
+ */
+DTRACE_LOADFUNC(8)
+DTRACE_LOADFUNC(16)
+DTRACE_LOADFUNC(32)
+DTRACE_LOADFUNC(64)
+
+static int
+dtrace_inscratch(uintptr_t dest, size_t size, dtrace_mstate_t *mstate)
+{
+	if (dest < mstate->dtms_scratch_base)
+		return (0);
+
+	if (dest + size < dest)
+		return (0);
+
+	if (dest + size > mstate->dtms_scratch_ptr)
+		return (0);
+
+	return (1);
+}
+
+static int
+dtrace_canstore_statvar(uint64_t addr, size_t sz,
+    dtrace_statvar_t **svars, int nsvars)
+{
+	int i;
+
+	for (i = 0; i < nsvars; i++) {
+		dtrace_statvar_t *svar = svars[i];
+
+		if (svar == NULL || svar->dtsv_size == 0)
+			continue;
+
+		if (DTRACE_INRANGE(addr, sz, svar->dtsv_data, svar->dtsv_size))
+			return (1);
+	}
+
+	return (0);
+}
+
+/*
+ * Check to see if the address is within a memory region to which a store may
+ * be issued.  This includes the DTrace scratch areas, and any DTrace variable
+ * region.  The caller of dtrace_canstore() is responsible for performing any
+ * alignment checks that are needed before stores are actually executed.
+ */
+static int
+dtrace_canstore(uint64_t addr, size_t sz, dtrace_mstate_t *mstate,
+    dtrace_vstate_t *vstate)
+{
+	/*
+	 * First, check to see if the address is in scratch space...
+	 */
+	if (DTRACE_INRANGE(addr, sz, mstate->dtms_scratch_base,
+	    mstate->dtms_scratch_size))
+		return (1);
+
+	/*
+	 * Now check to see if it's a dynamic variable.  This check will pick
+	 * up both thread-local variables and any global dynamically-allocated
+	 * variables.
+	 */
+	if (DTRACE_INRANGE(addr, sz, (uintptr_t)vstate->dtvs_dynvars.dtds_base,
+	    vstate->dtvs_dynvars.dtds_size)) {
+		dtrace_dstate_t *dstate = &vstate->dtvs_dynvars;
+		uintptr_t base = (uintptr_t)dstate->dtds_base +
+		    (dstate->dtds_hashsize * sizeof (dtrace_dynhash_t));
+		uintptr_t chunkoffs;
+
+		/*
+		 * Before we assume that we can store here, we need to make
+		 * sure that it isn't in our metadata -- storing to our
+		 * dynamic variable metadata would corrupt our state.  For
+		 * the range to not include any dynamic variable metadata,
+		 * it must:
+		 *
+		 *	(1) Start above the hash table that is at the base of
+		 *	the dynamic variable space
+		 *
+		 *	(2) Have a starting chunk offset that is beyond the
+		 *	dtrace_dynvar_t that is at the base of every chunk
+		 *
+		 *	(3) Not span a chunk boundary
+		 *
+		 */
+		if (addr < base)
+			return (0);
+
+		chunkoffs = (addr - base) % dstate->dtds_chunksize;
+
+		if (chunkoffs < sizeof (dtrace_dynvar_t))
+			return (0);
+
+		if (chunkoffs + sz > dstate->dtds_chunksize)
+			return (0);
+
+		return (1);
+	}
+
+	/*
+	 * Finally, check the static local and global variables.  These checks
+	 * take the longest, so we perform them last.
+	 */
+	if (dtrace_canstore_statvar(addr, sz,
+	    vstate->dtvs_locals, vstate->dtvs_nlocals))
+		return (1);
+
+	if (dtrace_canstore_statvar(addr, sz,
+	    vstate->dtvs_globals, vstate->dtvs_nglobals))
+		return (1);
+
+	return (0);
+}
+
+
+/*
+ * Convenience routine to check to see if the address is within a memory
+ * region in which a load may be issued given the user's privilege level;
+ * if not, it sets the appropriate error flags and loads 'addr' into the
+ * illegal value slot.
+ *
+ * DTrace subroutines (DIF_SUBR_*) should use this helper to implement
+ * appropriate memory access protection.
+ */
+static int
+dtrace_canload(uint64_t addr, size_t sz, dtrace_mstate_t *mstate,
+    dtrace_vstate_t *vstate)
+{
+	volatile uintptr_t *illval = &cpu_core[CPU->cpu_id].cpuc_dtrace_illval;
+
+	/*
+	 * If we hold the privilege to read from kernel memory, then
+	 * everything is readable.
+	 */
+	if ((mstate->dtms_access & DTRACE_ACCESS_KERNEL) != 0)
+		return (1);
+
+	/*
+	 * You can obviously read that which you can store.
+	 */
+	if (dtrace_canstore(addr, sz, mstate, vstate))
+		return (1);
+
+	/*
+	 * We're allowed to read from our own string table.
+	 */
+	if (DTRACE_INRANGE(addr, sz, (uintptr_t)mstate->dtms_difo->dtdo_strtab,
+	    mstate->dtms_difo->dtdo_strlen))
+		return (1);
+
+	DTRACE_CPUFLAG_SET(CPU_DTRACE_KPRIV);
+	*illval = addr;
+	return (0);
+}
+
+/*
+ * Convenience routine to check to see if a given string is within a memory
+ * region in which a load may be issued given the user's privilege level;
+ * this exists so that we don't need to issue unnecessary dtrace_strlen()
+ * calls in the event that the user has all privileges.
+ */
+static int
+dtrace_strcanload(uint64_t addr, size_t sz, dtrace_mstate_t *mstate,
+    dtrace_vstate_t *vstate)
+{
+	size_t strsz;
+
+	/*
+	 * If we hold the privilege to read from kernel memory, then
+	 * everything is readable.
+	 */
+	if ((mstate->dtms_access & DTRACE_ACCESS_KERNEL) != 0)
+		return (1);
+
+	strsz = 1 + dtrace_strlen((char *)(uintptr_t)addr, sz);
+	if (dtrace_canload(addr, strsz, mstate, vstate))
+		return (1);
+
+	return (0);
+}
+
+/*
+ * Convenience routine to check to see if a given variable is within a memory
+ * region in which a load may be issued given the user's privilege level.
+ */
+static int
+dtrace_vcanload(void *src, dtrace_diftype_t *type, dtrace_mstate_t *mstate,
+    dtrace_vstate_t *vstate)
+{
+	size_t sz;
+	ASSERT(type->dtdt_flags & DIF_TF_BYREF);
+
+	/*
+	 * If we hold the privilege to read from kernel memory, then
+	 * everything is readable.
+	 */
+	if ((mstate->dtms_access & DTRACE_ACCESS_KERNEL) != 0)
+		return (1);
+
+	if (type->dtdt_kind == DIF_TYPE_STRING)
+		sz = dtrace_strlen(src,
+		    vstate->dtvs_state->dts_options[DTRACEOPT_STRSIZE]) + 1;
+	else
+		sz = type->dtdt_size;
+
+	return (dtrace_canload((uintptr_t)src, sz, mstate, vstate));
+}
+
+/*
+ * Compare two strings using safe loads.
+ */
+static int
+dtrace_strncmp(char *s1, char *s2, size_t limit)
+{
+	uint8_t c1, c2;
+	volatile uint16_t *flags;
+
+	if (s1 == s2 || limit == 0)
+		return (0);
+
+	flags = (volatile uint16_t *)&cpu_core[CPU->cpu_id].cpuc_dtrace_flags;
+
+	do {
+		if (s1 == NULL) {
+			c1 = '\0';
+		} else {
+			c1 = dtrace_load8((uintptr_t)s1++);
+		}
+
+		if (s2 == NULL) {
+			c2 = '\0';
+		} else {
+			c2 = dtrace_load8((uintptr_t)s2++);
+		}
+
+		if (c1 != c2)
+			return (c1 - c2);
+	} while (--limit && c1 != '\0' && !(*flags & CPU_DTRACE_FAULT));
+
+	return (0);
+}
+
+/*
+ * Compute strlen(s) for a string using safe memory accesses.  The additional
+ * len parameter is used to specify a maximum length to ensure completion.
+ */
+static size_t
+dtrace_strlen(const char *s, size_t lim)
+{
+	uint_t len;
+
+	for (len = 0; len != lim; len++) {
+		if (dtrace_load8((uintptr_t)s++) == '\0')
+			break;
+	}
+
+	return (len);
+}
+
+/*
+ * Check if an address falls within a toxic region.
+ */
+static int
+dtrace_istoxic(uintptr_t kaddr, size_t size)
+{
+	uintptr_t taddr, tsize;
+	int i;
+
+	for (i = 0; i < dtrace_toxranges; i++) {
+		taddr = dtrace_toxrange[i].dtt_base;
+		tsize = dtrace_toxrange[i].dtt_limit - taddr;
+
+		if (kaddr - taddr < tsize) {
+			DTRACE_CPUFLAG_SET(CPU_DTRACE_BADADDR);
+			cpu_core[CPU->cpu_id].cpuc_dtrace_illval = kaddr;
+			return (1);
+		}
+
+		if (taddr - kaddr < size) {
+			DTRACE_CPUFLAG_SET(CPU_DTRACE_BADADDR);
+			cpu_core[CPU->cpu_id].cpuc_dtrace_illval = taddr;
+			return (1);
+		}
+	}
+
+	return (0);
+}
+
+/*
+ * Copy src to dst using safe memory accesses.  The src is assumed to be unsafe
+ * memory specified by the DIF program.  The dst is assumed to be safe memory
+ * that we can store to directly because it is managed by DTrace.  As with
+ * standard bcopy, overlapping copies are handled properly.
+ */
+static void
+dtrace_bcopy(const void *src, void *dst, size_t len)
+{
+	if (len != 0) {
+		uint8_t *s1 = dst;
+		const uint8_t *s2 = src;
+
+		if (s1 <= s2) {
+			do {
+				*s1++ = dtrace_load8((uintptr_t)s2++);
+			} while (--len != 0);
+		} else {
+			s2 += len;
+			s1 += len;
+
+			do {
+				*--s1 = dtrace_load8((uintptr_t)--s2);
+			} while (--len != 0);
+		}
+	}
+}
+
+/*
+ * Copy src to dst using safe memory accesses, up to either the specified
+ * length, or the point that a nul byte is encountered.  The src is assumed to
+ * be unsafe memory specified by the DIF program.  The dst is assumed to be
+ * safe memory that we can store to directly because it is managed by DTrace.
+ * Unlike dtrace_bcopy(), overlapping regions are not handled.
+ */
+static void
+dtrace_strcpy(const void *src, void *dst, size_t len)
+{
+	if (len != 0) {
+		uint8_t *s1 = dst, c;
+		const uint8_t *s2 = src;
+
+		do {
+			*s1++ = c = dtrace_load8((uintptr_t)s2++);
+		} while (--len != 0 && c != '\0');
+	}
+}
+
+/*
+ * Copy src to dst, deriving the size and type from the specified (BYREF)
+ * variable type.  The src is assumed to be unsafe memory specified by the DIF
+ * program.  The dst is assumed to be DTrace variable memory that is of the
+ * specified type; we assume that we can store to directly.
+ */
+static void
+dtrace_vcopy(void *src, void *dst, dtrace_diftype_t *type)
+{
+	ASSERT(type->dtdt_flags & DIF_TF_BYREF);
+
+	if (type->dtdt_kind == DIF_TYPE_STRING) {
+		dtrace_strcpy(src, dst, type->dtdt_size);
+	} else {
+		dtrace_bcopy(src, dst, type->dtdt_size);
+	}
+}
+
+/*
+ * Compare s1 to s2 using safe memory accesses.  The s1 data is assumed to be
+ * unsafe memory specified by the DIF program.  The s2 data is assumed to be
+ * safe memory that we can access directly because it is managed by DTrace.
+ */
+static int
+dtrace_bcmp(const void *s1, const void *s2, size_t len)
+{
+	volatile uint16_t *flags;
+
+	flags = (volatile uint16_t *)&cpu_core[CPU->cpu_id].cpuc_dtrace_flags;
+
+	if (s1 == s2)
+		return (0);
+
+	if (s1 == NULL || s2 == NULL)
+		return (1);
+
+	if (s1 != s2 && len != 0) {
+		const uint8_t *ps1 = s1;
+		const uint8_t *ps2 = s2;
+
+		do {
+			if (dtrace_load8((uintptr_t)ps1++) != *ps2++)
+				return (1);
+		} while (--len != 0 && !(*flags & CPU_DTRACE_FAULT));
+	}
+	return (0);
+}
+
+/*
+ * Zero the specified region using a simple byte-by-byte loop.  Note that this
+ * is for safe DTrace-managed memory only.
+ */
+static void
+dtrace_bzero(void *dst, size_t len)
+{
+	uchar_t *cp;
+
+	for (cp = dst; len != 0; len--)
+		*cp++ = 0;
+}
+
+static void
+dtrace_add_128(uint64_t *addend1, uint64_t *addend2, uint64_t *sum)
+{
+	uint64_t result[2];
+
+	result[0] = addend1[0] + addend2[0];
+	result[1] = addend1[1] + addend2[1] +
+	    (result[0] < addend1[0] || result[0] < addend2[0] ? 1 : 0);
+
+	sum[0] = result[0];
+	sum[1] = result[1];
+}
+
+/*
+ * Shift the 128-bit value in a by b. If b is positive, shift left.
+ * If b is negative, shift right.
+ */
+static void
+dtrace_shift_128(uint64_t *a, int b)
+{
+	uint64_t mask;
+
+	if (b == 0)
+		return;
+
+	if (b < 0) {
+		b = -b;
+		if (b >= 64) {
+			a[0] = a[1] >> (b - 64);
+			a[1] = 0;
+		} else {
+			a[0] >>= b;
+			mask = 1LL << (64 - b);
+			mask -= 1;
+			a[0] |= ((a[1] & mask) << (64 - b));
+			a[1] >>= b;
+		}
+	} else {
+		if (b >= 64) {
+			a[1] = a[0] << (b - 64);
+			a[0] = 0;
+		} else {
+			a[1] <<= b;
+			mask = a[0] >> (64 - b);
+			a[1] |= mask;
+			a[0] <<= b;
+		}
+	}
+}
+
+/*
+ * The basic idea is to break the 2 64-bit values into 4 32-bit values,
+ * use native multiplication on those, and then re-combine into the
+ * resulting 128-bit value.
+ *
+ * (hi1 << 32 + lo1) * (hi2 << 32 + lo2) =
+ *     hi1 * hi2 << 64 +
+ *     hi1 * lo2 << 32 +
+ *     hi2 * lo1 << 32 +
+ *     lo1 * lo2
+ */
+static void
+dtrace_multiply_128(uint64_t factor1, uint64_t factor2, uint64_t *product)
+{
+	uint64_t hi1, hi2, lo1, lo2;
+	uint64_t tmp[2];
+
+	hi1 = factor1 >> 32;
+	hi2 = factor2 >> 32;
+
+	lo1 = factor1 & DT_MASK_LO;
+	lo2 = factor2 & DT_MASK_LO;
+
+	product[0] = lo1 * lo2;
+	product[1] = hi1 * hi2;
+
+	tmp[0] = hi1 * lo2;
+	tmp[1] = 0;
+	dtrace_shift_128(tmp, 32);
+	dtrace_add_128(product, tmp, product);
+
+	tmp[0] = hi2 * lo1;
+	tmp[1] = 0;
+	dtrace_shift_128(tmp, 32);
+	dtrace_add_128(product, tmp, product);
+}
+
+/*
+ * This privilege check should be used by actions and subroutines to
+ * verify that the user credentials of the process that enabled the
+ * invoking ECB match the target credentials
+ */
+static int
+dtrace_priv_proc_common_user(dtrace_state_t *state)
+{
+	cred_t *cr, *s_cr = state->dts_cred.dcr_cred;
+
+	/*
+	 * We should always have a non-NULL state cred here, since if cred
+	 * is null (anonymous tracing), we fast-path bypass this routine.
+	 */
+	ASSERT(s_cr != NULL);
+
+	if ((cr = CRED()) != NULL &&
+	    s_cr->cr_uid == cr->cr_uid &&
+	    s_cr->cr_uid == cr->cr_ruid &&
+	    s_cr->cr_uid == cr->cr_suid &&
+	    s_cr->cr_gid == cr->cr_gid &&
+	    s_cr->cr_gid == cr->cr_rgid &&
+	    s_cr->cr_gid == cr->cr_sgid)
+		return (1);
+
+	return (0);
+}
+
+/*
+ * This privilege check should be used by actions and subroutines to
+ * verify that the zone of the process that enabled the invoking ECB
+ * matches the target credentials
+ */
+static int
+dtrace_priv_proc_common_zone(dtrace_state_t *state)
+{
+	cred_t *cr, *s_cr = state->dts_cred.dcr_cred;
+
+	/*
+	 * We should always have a non-NULL state cred here, since if cred
+	 * is null (anonymous tracing), we fast-path bypass this routine.
+	 */
+	ASSERT(s_cr != NULL);
+
+	if ((cr = CRED()) != NULL &&
+	    s_cr->cr_zone == cr->cr_zone)
+		return (1);
+
+	return (0);
+}
+
+/*
+ * This privilege check should be used by actions and subroutines to
+ * verify that the process has not setuid or changed credentials.
+ */
+static int
+dtrace_priv_proc_common_nocd()
+{
+	proc_t *proc;
+
+	if ((proc = ttoproc(curthread)) != NULL &&
+	    !(proc->p_flag & SNOCD))
+		return (1);
+
+	return (0);
+}
+
+static int
+dtrace_priv_proc_destructive(dtrace_state_t *state)
+{
+	int action = state->dts_cred.dcr_action;
+
+	if (((action & DTRACE_CRA_PROC_DESTRUCTIVE_ALLZONE) == 0) &&
+	    dtrace_priv_proc_common_zone(state) == 0)
+		goto bad;
+
+	if (((action & DTRACE_CRA_PROC_DESTRUCTIVE_ALLUSER) == 0) &&
+	    dtrace_priv_proc_common_user(state) == 0)
+		goto bad;
+
+	if (((action & DTRACE_CRA_PROC_DESTRUCTIVE_CREDCHG) == 0) &&
+	    dtrace_priv_proc_common_nocd() == 0)
+		goto bad;
+
+	return (1);
+
+bad:
+	cpu_core[CPU->cpu_id].cpuc_dtrace_flags |= CPU_DTRACE_UPRIV;
+
+	return (0);
+}
+
+static int
+dtrace_priv_proc_control(dtrace_state_t *state)
+{
+	if (state->dts_cred.dcr_action & DTRACE_CRA_PROC_CONTROL)
+		return (1);
+
+	if (dtrace_priv_proc_common_zone(state) &&
+	    dtrace_priv_proc_common_user(state) &&
+	    dtrace_priv_proc_common_nocd())
+		return (1);
+
+	cpu_core[CPU->cpu_id].cpuc_dtrace_flags |= CPU_DTRACE_UPRIV;
+
+	return (0);
+}
+
+static int
+dtrace_priv_proc(dtrace_state_t *state)
+{
+	if (state->dts_cred.dcr_action & DTRACE_CRA_PROC)
+		return (1);
+
+	cpu_core[CPU->cpu_id].cpuc_dtrace_flags |= CPU_DTRACE_UPRIV;
+
+	return (0);
+}
+
+static int
+dtrace_priv_kernel(dtrace_state_t *state)
+{
+	if (state->dts_cred.dcr_action & DTRACE_CRA_KERNEL)
+		return (1);
+
+	cpu_core[CPU->cpu_id].cpuc_dtrace_flags |= CPU_DTRACE_KPRIV;
+
+	return (0);
+}
+
+static int
+dtrace_priv_kernel_destructive(dtrace_state_t *state)
+{
+	if (state->dts_cred.dcr_action & DTRACE_CRA_KERNEL_DESTRUCTIVE)
+		return (1);
+
+	cpu_core[CPU->cpu_id].cpuc_dtrace_flags |= CPU_DTRACE_KPRIV;
+
+	return (0);
+}
+
+/*
+ * Note:  not called from probe context.  This function is called
+ * asynchronously (and at a regular interval) from outside of probe context to
+ * clean the dirty dynamic variable lists on all CPUs.  Dynamic variable
+ * cleaning is explained in detail in <sys/dtrace_impl.h>.
+ */
+void
+dtrace_dynvar_clean(dtrace_dstate_t *dstate)
+{
+	dtrace_dynvar_t *dirty;
+	dtrace_dstate_percpu_t *dcpu;
+	int i, work = 0;
+
+	for (i = 0; i < NCPU; i++) {
+		dcpu = &dstate->dtds_percpu[i];
+
+		ASSERT(dcpu->dtdsc_rinsing == NULL);
+
+		/*
+		 * If the dirty list is NULL, there is no dirty work to do.
+		 */
+		if (dcpu->dtdsc_dirty == NULL)
+			continue;
+
+		/*
+		 * If the clean list is non-NULL, then we're not going to do
+		 * any work for this CPU -- it means that there has not been
+		 * a dtrace_dynvar() allocation on this CPU (or from this CPU)
+		 * since the last time we cleaned house.
+		 */
+		if (dcpu->dtdsc_clean != NULL)
+			continue;
+
+		work = 1;
+
+		/*
+		 * Atomically move the dirty list aside.
+		 */
+		do {
+			dirty = dcpu->dtdsc_dirty;
+
+			/*
+			 * Before we zap the dirty list, set the rinsing list.
+			 * (This allows for a potential assertion in
+			 * dtrace_dynvar():  if a free dynamic variable appears
+			 * on a hash chain, either the dirty list or the
+			 * rinsing list for some CPU must be non-NULL.)
+			 */
+			dcpu->dtdsc_rinsing = dirty;
+			dtrace_membar_producer();
+		} while (dtrace_casptr(&dcpu->dtdsc_dirty,
+		    dirty, NULL) != dirty);
+	}
+
+	if (!work) {
+		/*
+		 * We have no work to do; we can simply return.
+		 */
+		return;
+	}
+
+	dtrace_sync();
+
+	for (i = 0; i < NCPU; i++) {
+		dcpu = &dstate->dtds_percpu[i];
+
+		if (dcpu->dtdsc_rinsing == NULL)
+			continue;
+
+		/*
+		 * We are now guaranteed that no hash chain contains a pointer
+		 * into this dirty list; we can make it clean.
+		 */
+		ASSERT(dcpu->dtdsc_clean == NULL);
+		dcpu->dtdsc_clean = dcpu->dtdsc_rinsing;
+		dcpu->dtdsc_rinsing = NULL;
+	}
+
+	/*
+	 * Before we actually set the state to be DTRACE_DSTATE_CLEAN, make
+	 * sure that all CPUs have seen all of the dtdsc_clean pointers.
+	 * This prevents a race whereby a CPU incorrectly decides that
+	 * the state should be something other than DTRACE_DSTATE_CLEAN
+	 * after dtrace_dynvar_clean() has completed.
+	 */
+	dtrace_sync();
+
+	dstate->dtds_state = DTRACE_DSTATE_CLEAN;
+}
+
+/*
+ * Depending on the value of the op parameter, this function looks-up,
+ * allocates or deallocates an arbitrarily-keyed dynamic variable.  If an
+ * allocation is requested, this function will return a pointer to a
+ * dtrace_dynvar_t corresponding to the allocated variable -- or NULL if no
+ * variable can be allocated.  If NULL is returned, the appropriate counter
+ * will be incremented.
+ */
+dtrace_dynvar_t *
+dtrace_dynvar(dtrace_dstate_t *dstate, uint_t nkeys,
+    dtrace_key_t *key, size_t dsize, dtrace_dynvar_op_t op,
+    dtrace_mstate_t *mstate, dtrace_vstate_t *vstate)
+{
+	uint64_t hashval = DTRACE_DYNHASH_VALID;
+	dtrace_dynhash_t *hash = dstate->dtds_hash;
+	dtrace_dynvar_t *free, *new_free, *next, *dvar, *start, *prev = NULL;
+	processorid_t me = CPU->cpu_id, cpu = me;
+	dtrace_dstate_percpu_t *dcpu = &dstate->dtds_percpu[me];
+	size_t bucket, ksize;
+	size_t chunksize = dstate->dtds_chunksize;
+	uintptr_t kdata, lock, nstate;
+	uint_t i;
+
+	ASSERT(nkeys != 0);
+
+	/*
+	 * Hash the key.  As with aggregations, we use Jenkins' "One-at-a-time"
+	 * algorithm.  For the by-value portions, we perform the algorithm in
+	 * 16-bit chunks (as opposed to 8-bit chunks).  This speeds things up a
+	 * bit, and seems to have only a minute effect on distribution.  For
+	 * the by-reference data, we perform "One-at-a-time" iterating (safely)
+	 * over each referenced byte.  It's painful to do this, but it's much
+	 * better than pathological hash distribution.  The efficacy of the
+	 * hashing algorithm (and a comparison with other algorithms) may be
+	 * found by running the ::dtrace_dynstat MDB dcmd.
+	 */
+	for (i = 0; i < nkeys; i++) {
+		if (key[i].dttk_size == 0) {
+			uint64_t val = key[i].dttk_value;
+
+			hashval += (val >> 48) & 0xffff;
+			hashval += (hashval << 10);
+			hashval ^= (hashval >> 6);
+
+			hashval += (val >> 32) & 0xffff;
+			hashval += (hashval << 10);
+			hashval ^= (hashval >> 6);
+
+			hashval += (val >> 16) & 0xffff;
+			hashval += (hashval << 10);
+			hashval ^= (hashval >> 6);
+
+			hashval += val & 0xffff;
+			hashval += (hashval << 10);
+			hashval ^= (hashval >> 6);
+		} else {
+			/*
+			 * This is incredibly painful, but it beats the hell
+			 * out of the alternative.
+			 */
+			uint64_t j, size = key[i].dttk_size;
+			uintptr_t base = (uintptr_t)key[i].dttk_value;
+
+			if (!dtrace_canload(base, size, mstate, vstate))
+				break;
+
+			for (j = 0; j < size; j++) {
+				hashval += dtrace_load8(base + j);
+				hashval += (hashval << 10);
+				hashval ^= (hashval >> 6);
+			}
+		}
+	}
+
+	if (DTRACE_CPUFLAG_ISSET(CPU_DTRACE_FAULT))
+		return (NULL);
+
+	hashval += (hashval << 3);
+	hashval ^= (hashval >> 11);
+	hashval += (hashval << 15);
+
+	/*
+	 * There is a remote chance (ideally, 1 in 2^31) that our hashval
+	 * comes out to be one of our two sentinel hash values.  If this
+	 * actually happens, we set the hashval to be a value known to be a
+	 * non-sentinel value.
+	 */
+	if (hashval == DTRACE_DYNHASH_FREE || hashval == DTRACE_DYNHASH_SINK)
+		hashval = DTRACE_DYNHASH_VALID;
+
+	/*
+	 * Yes, it's painful to do a divide here.  If the cycle count becomes
+	 * important here, tricks can be pulled to reduce it.  (However, it's
+	 * critical that hash collisions be kept to an absolute minimum;
+	 * they're much more painful than a divide.)  It's better to have a
+	 * solution that generates few collisions and still keeps things
+	 * relatively simple.
+	 */
+	bucket = hashval % dstate->dtds_hashsize;
+
+	if (op == DTRACE_DYNVAR_DEALLOC) {
+		volatile uintptr_t *lockp = &hash[bucket].dtdh_lock;
+
+		for (;;) {
+			while ((lock = *lockp) & 1)
+				continue;
+
+			if (dtrace_casptr((void *)lockp,
+			    (void *)lock, (void *)(lock + 1)) == (void *)lock)
+				break;
+		}
+
+		dtrace_membar_producer();
+	}
+
+top:
+	prev = NULL;
+	lock = hash[bucket].dtdh_lock;
+
+	dtrace_membar_consumer();
+
+	start = hash[bucket].dtdh_chain;
+	ASSERT(start != NULL && (start->dtdv_hashval == DTRACE_DYNHASH_SINK ||
+	    start->dtdv_hashval != DTRACE_DYNHASH_FREE ||
+	    op != DTRACE_DYNVAR_DEALLOC));
+
+	for (dvar = start; dvar != NULL; dvar = dvar->dtdv_next) {
+		dtrace_tuple_t *dtuple = &dvar->dtdv_tuple;
+		dtrace_key_t *dkey = &dtuple->dtt_key[0];
+
+		if (dvar->dtdv_hashval != hashval) {
+			if (dvar->dtdv_hashval == DTRACE_DYNHASH_SINK) {
+				/*
+				 * We've reached the sink, and therefore the
+				 * end of the hash chain; we can kick out of
+				 * the loop knowing that we have seen a valid
+				 * snapshot of state.
+				 */
+				ASSERT(dvar->dtdv_next == NULL);
+				ASSERT(dvar == &dtrace_dynhash_sink);
+				break;
+			}
+
+			if (dvar->dtdv_hashval == DTRACE_DYNHASH_FREE) {
+				/*
+				 * We've gone off the rails:  somewhere along
+				 * the line, one of the members of this hash
+				 * chain was deleted.  Note that we could also
+				 * detect this by simply letting this loop run
+				 * to completion, as we would eventually hit
+				 * the end of the dirty list.  However, we
+				 * want to avoid running the length of the
+				 * dirty list unnecessarily (it might be quite
+				 * long), so we catch this as early as
+				 * possible by detecting the hash marker.  In
+				 * this case, we simply set dvar to NULL and
+				 * break; the conditional after the loop will
+				 * send us back to top.
+				 */
+				dvar = NULL;
+				break;
+			}
+
+			goto next;
+		}
+
+		if (dtuple->dtt_nkeys != nkeys)
+			goto next;
+
+		for (i = 0; i < nkeys; i++, dkey++) {
+			if (dkey->dttk_size != key[i].dttk_size)
+				goto next; /* size or type mismatch */
+
+			if (dkey->dttk_size != 0) {
+				if (dtrace_bcmp(
+				    (void *)(uintptr_t)key[i].dttk_value,
+				    (void *)(uintptr_t)dkey->dttk_value,
+				    dkey->dttk_size))
+					goto next;
+			} else {
+				if (dkey->dttk_value != key[i].dttk_value)
+					goto next;
+			}
+		}
+
+		if (op != DTRACE_DYNVAR_DEALLOC)
+			return (dvar);
+
+		ASSERT(dvar->dtdv_next == NULL ||
+		    dvar->dtdv_next->dtdv_hashval != DTRACE_DYNHASH_FREE);
+
+		if (prev != NULL) {
+			ASSERT(hash[bucket].dtdh_chain != dvar);
+			ASSERT(start != dvar);
+			ASSERT(prev->dtdv_next == dvar);
+			prev->dtdv_next = dvar->dtdv_next;
+		} else {
+			if (dtrace_casptr(&hash[bucket].dtdh_chain,
+			    start, dvar->dtdv_next) != start) {
+				/*
+				 * We have failed to atomically swing the
+				 * hash table head pointer, presumably because
+				 * of a conflicting allocation on another CPU.
+				 * We need to reread the hash chain and try
+				 * again.
+				 */
+				goto top;
+			}
+		}
+
+		dtrace_membar_producer();
+
+		/*
+		 * Now set the hash value to indicate that it's free.
+		 */
+		ASSERT(hash[bucket].dtdh_chain != dvar);
+		dvar->dtdv_hashval = DTRACE_DYNHASH_FREE;
+
+		dtrace_membar_producer();
+
+		/*
+		 * Set the next pointer to point at the dirty list, and
+		 * atomically swing the dirty pointer to the newly freed dvar.
+		 */
+		do {
+			next = dcpu->dtdsc_dirty;
+			dvar->dtdv_next = next;
+		} while (dtrace_casptr(&dcpu->dtdsc_dirty, next, dvar) != next);
+
+		/*
+		 * Finally, unlock this hash bucket.
+		 */
+		ASSERT(hash[bucket].dtdh_lock == lock);
+		ASSERT(lock & 1);
+		hash[bucket].dtdh_lock++;
+
+		return (NULL);
+next:
+		prev = dvar;
+		continue;
+	}
+
+	if (dvar == NULL) {
+		/*
+		 * If dvar is NULL, it is because we went off the rails:
+		 * one of the elements that we traversed in the hash chain
+		 * was deleted while we were traversing it.  In this case,
+		 * we assert that we aren't doing a dealloc (deallocs lock
+		 * the hash bucket to prevent themselves from racing with
+		 * one another), and retry the hash chain traversal.
+		 */
+		ASSERT(op != DTRACE_DYNVAR_DEALLOC);
+		goto top;
+	}
+
+	if (op != DTRACE_DYNVAR_ALLOC) {
+		/*
+		 * If we are not to allocate a new variable, we want to
+		 * return NULL now.  Before we return, check that the value
+		 * of the lock word hasn't changed.  If it has, we may have
+		 * seen an inconsistent snapshot.
+		 */
+		if (op == DTRACE_DYNVAR_NOALLOC) {
+			if (hash[bucket].dtdh_lock != lock)
+				goto top;
+		} else {
+			ASSERT(op == DTRACE_DYNVAR_DEALLOC);
+			ASSERT(hash[bucket].dtdh_lock == lock);
+			ASSERT(lock & 1);
+			hash[bucket].dtdh_lock++;
+		}
+
+		return (NULL);
+	}
+
+	/*
+	 * We need to allocate a new dynamic variable.  The size we need is the
+	 * size of dtrace_dynvar plus the size of nkeys dtrace_key_t's plus the
+	 * size of any auxiliary key data (rounded up to 8-byte alignment) plus
+	 * the size of any referred-to data (dsize).  We then round the final
+	 * size up to the chunksize for allocation.
+	 */
+	for (ksize = 0, i = 0; i < nkeys; i++)
+		ksize += P2ROUNDUP(key[i].dttk_size, sizeof (uint64_t));
+
+	/*
+	 * This should be pretty much impossible, but could happen if, say,
+	 * strange DIF specified the tuple.  Ideally, this should be an
+	 * assertion and not an error condition -- but that requires that the
+	 * chunksize calculation in dtrace_difo_chunksize() be absolutely
+	 * bullet-proof.  (That is, it must not be able to be fooled by
+	 * malicious DIF.)  Given the lack of backwards branches in DIF,
+	 * solving this would presumably not amount to solving the Halting
+	 * Problem -- but it still seems awfully hard.
+	 */
+	if (sizeof (dtrace_dynvar_t) + sizeof (dtrace_key_t) * (nkeys - 1) +
+	    ksize + dsize > chunksize) {
+		dcpu->dtdsc_drops++;
+		return (NULL);
+	}
+
+	nstate = DTRACE_DSTATE_EMPTY;
+
+	do {
+retry:
+		free = dcpu->dtdsc_free;
+
+		if (free == NULL) {
+			dtrace_dynvar_t *clean = dcpu->dtdsc_clean;
+			void *rval;
+
+			if (clean == NULL) {
+				/*
+				 * We're out of dynamic variable space on
+				 * this CPU.  Unless we have tried all CPUs,
+				 * we'll try to allocate from a different
+				 * CPU.
+				 */
+				switch (dstate->dtds_state) {
+				case DTRACE_DSTATE_CLEAN: {
+					void *sp = &dstate->dtds_state;
+
+					if (++cpu >= NCPU)
+						cpu = 0;
+
+					if (dcpu->dtdsc_dirty != NULL &&
+					    nstate == DTRACE_DSTATE_EMPTY)
+						nstate = DTRACE_DSTATE_DIRTY;
+
+					if (dcpu->dtdsc_rinsing != NULL)
+						nstate = DTRACE_DSTATE_RINSING;
+
+					dcpu = &dstate->dtds_percpu[cpu];
+
+					if (cpu != me)
+						goto retry;
+
+					(void) dtrace_cas32(sp,
+					    DTRACE_DSTATE_CLEAN, nstate);
+
+					/*
+					 * To increment the correct bean
+					 * counter, take another lap.
+					 */
+					goto retry;
+				}
+
+				case DTRACE_DSTATE_DIRTY:
+					dcpu->dtdsc_dirty_drops++;
+					break;
+
+				case DTRACE_DSTATE_RINSING:
+					dcpu->dtdsc_rinsing_drops++;
+					break;
+
+				case DTRACE_DSTATE_EMPTY:
+					dcpu->dtdsc_drops++;
+					break;
+				}
+
+				DTRACE_CPUFLAG_SET(CPU_DTRACE_DROP);
+				return (NULL);
+			}
+
+			/*
+			 * The clean list appears to be non-empty.  We want to
+			 * move the clean list to the free list; we start by
+			 * moving the clean pointer aside.
+			 */
+			if (dtrace_casptr(&dcpu->dtdsc_clean,
+			    clean, NULL) != clean) {
+				/*
+				 * We are in one of two situations:
+				 *
+				 *  (a)	The clean list was switched to the
+				 *	free list by another CPU.
+				 *
+				 *  (b)	The clean list was added to by the
+				 *	cleansing cyclic.
+				 *
+				 * In either of these situations, we can
+				 * just reattempt the free list allocation.
+				 */
+				goto retry;
+			}
+
+			ASSERT(clean->dtdv_hashval == DTRACE_DYNHASH_FREE);
+
+			/*
+			 * Now we'll move the clean list to the free list.
+			 * It's impossible for this to fail:  the only way
+			 * the free list can be updated is through this
+			 * code path, and only one CPU can own the clean list.
+			 * Thus, it would only be possible for this to fail if
+			 * this code were racing with dtrace_dynvar_clean().
+			 * (That is, if dtrace_dynvar_clean() updated the clean
+			 * list, and we ended up racing to update the free
+			 * list.)  This race is prevented by the dtrace_sync()
+			 * in dtrace_dynvar_clean() -- which flushes the
+			 * owners of the clean lists out before resetting
+			 * the clean lists.
+			 */
+			rval = dtrace_casptr(&dcpu->dtdsc_free, NULL, clean);
+			ASSERT(rval == NULL);
+			goto retry;
+		}
+
+		dvar = free;
+		new_free = dvar->dtdv_next;
+	} while (dtrace_casptr(&dcpu->dtdsc_free, free, new_free) != free);
+
+	/*
+	 * We have now allocated a new chunk.  We copy the tuple keys into the
+	 * tuple array and copy any referenced key data into the data space
+	 * following the tuple array.  As we do this, we relocate dttk_value
+	 * in the final tuple to point to the key data address in the chunk.
+	 */
+	kdata = (uintptr_t)&dvar->dtdv_tuple.dtt_key[nkeys];
+	dvar->dtdv_data = (void *)(kdata + ksize);
+	dvar->dtdv_tuple.dtt_nkeys = nkeys;
+
+	for (i = 0; i < nkeys; i++) {
+		dtrace_key_t *dkey = &dvar->dtdv_tuple.dtt_key[i];
+		size_t kesize = key[i].dttk_size;
+
+		if (kesize != 0) {
+			dtrace_bcopy(
+			    (const void *)(uintptr_t)key[i].dttk_value,
+			    (void *)kdata, kesize);
+			dkey->dttk_value = kdata;
+			kdata += P2ROUNDUP(kesize, sizeof (uint64_t));
+		} else {
+			dkey->dttk_value = key[i].dttk_value;
+		}
+
+		dkey->dttk_size = kesize;
+	}
+
+	ASSERT(dvar->dtdv_hashval == DTRACE_DYNHASH_FREE);
+	dvar->dtdv_hashval = hashval;
+	dvar->dtdv_next = start;
+
+	if (dtrace_casptr(&hash[bucket].dtdh_chain, start, dvar) == start)
+		return (dvar);
+
+	/*
+	 * The cas has failed.  Either another CPU is adding an element to
+	 * this hash chain, or another CPU is deleting an element from this
+	 * hash chain.  The simplest way to deal with both of these cases
+	 * (though not necessarily the most efficient) is to free our
+	 * allocated block and tail-call ourselves.  Note that the free is
+	 * to the dirty list and _not_ to the free list.  This is to prevent
+	 * races with allocators, above.
+	 */
+	dvar->dtdv_hashval = DTRACE_DYNHASH_FREE;
+
+	dtrace_membar_producer();
+
+	do {
+		free = dcpu->dtdsc_dirty;
+		dvar->dtdv_next = free;
+	} while (dtrace_casptr(&dcpu->dtdsc_dirty, free, dvar) != free);
+
+	return (dtrace_dynvar(dstate, nkeys, key, dsize, op, mstate, vstate));
+}
+
+/*ARGSUSED*/
+static void
+dtrace_aggregate_min(uint64_t *oval, uint64_t nval, uint64_t arg)
+{
+	if ((int64_t)nval < (int64_t)*oval)
+		*oval = nval;
+}
+
+/*ARGSUSED*/
+static void
+dtrace_aggregate_max(uint64_t *oval, uint64_t nval, uint64_t arg)
+{
+	if ((int64_t)nval > (int64_t)*oval)
+		*oval = nval;
+}
+
+static void
+dtrace_aggregate_quantize(uint64_t *quanta, uint64_t nval, uint64_t incr)
+{
+	int i, zero = DTRACE_QUANTIZE_ZEROBUCKET;
+	int64_t val = (int64_t)nval;
+
+	if (val < 0) {
+		for (i = 0; i < zero; i++) {
+			if (val <= DTRACE_QUANTIZE_BUCKETVAL(i)) {
+				quanta[i] += incr;
+				return;
+			}
+		}
+	} else {
+		for (i = zero + 1; i < DTRACE_QUANTIZE_NBUCKETS; i++) {
+			if (val < DTRACE_QUANTIZE_BUCKETVAL(i)) {
+				quanta[i - 1] += incr;
+				return;
+			}
+		}
+
+		quanta[DTRACE_QUANTIZE_NBUCKETS - 1] += incr;
+		return;
+	}
+
+	ASSERT(0);
+}
+
+static void
+dtrace_aggregate_lquantize(uint64_t *lquanta, uint64_t nval, uint64_t incr)
+{
+	uint64_t arg = *lquanta++;
+	int32_t base = DTRACE_LQUANTIZE_BASE(arg);
+	uint16_t step = DTRACE_LQUANTIZE_STEP(arg);
+	uint16_t levels = DTRACE_LQUANTIZE_LEVELS(arg);
+	int32_t val = (int32_t)nval, level;
+
+	ASSERT(step != 0);
+	ASSERT(levels != 0);
+
+	if (val < base) {
+		/*
+		 * This is an underflow.
+		 */
+		lquanta[0] += incr;
+		return;
+	}
+
+	level = (val - base) / step;
+
+	if (level < levels) {
+		lquanta[level + 1] += incr;
+		return;
+	}
+
+	/*
+	 * This is an overflow.
+	 */
+	lquanta[levels + 1] += incr;
+}
+
+/*ARGSUSED*/
+static void
+dtrace_aggregate_avg(uint64_t *data, uint64_t nval, uint64_t arg)
+{
+	data[0]++;
+	data[1] += nval;
+}
+
+/*ARGSUSED*/
+static void
+dtrace_aggregate_stddev(uint64_t *data, uint64_t nval, uint64_t arg)
+{
+	int64_t snval = (int64_t)nval;
+	uint64_t tmp[2];
+
+	data[0]++;
+	data[1] += nval;
+
+	/*
+	 * What we want to say here is:
+	 *
+	 * data[2] += nval * nval;
+	 *
+	 * But given that nval is 64-bit, we could easily overflow, so
+	 * we do this as 128-bit arithmetic.
+	 */
+	if (snval < 0)
+		snval = -snval;
+
+	dtrace_multiply_128((uint64_t)snval, (uint64_t)snval, tmp);
+	dtrace_add_128(data + 2, tmp, data + 2);
+}
+
+/*ARGSUSED*/
+static void
+dtrace_aggregate_count(uint64_t *oval, uint64_t nval, uint64_t arg)
+{
+	*oval = *oval + 1;
+}
+
+/*ARGSUSED*/
+static void
+dtrace_aggregate_sum(uint64_t *oval, uint64_t nval, uint64_t arg)
+{
+	*oval += nval;
+}
+
+/*
+ * Aggregate given the tuple in the principal data buffer, and the aggregating
+ * action denoted by the specified dtrace_aggregation_t.  The aggregation
+ * buffer is specified as the buf parameter.  This routine does not return
+ * failure; if there is no space in the aggregation buffer, the data will be
+ * dropped, and a corresponding counter incremented.
+ */
+static void
+dtrace_aggregate(dtrace_aggregation_t *agg, dtrace_buffer_t *dbuf,
+    intptr_t offset, dtrace_buffer_t *buf, uint64_t expr, uint64_t arg)
+{
+	dtrace_recdesc_t *rec = &agg->dtag_action.dta_rec;
+	uint32_t i, ndx, size, fsize;
+	uint32_t align = sizeof (uint64_t) - 1;
+	dtrace_aggbuffer_t *agb;
+	dtrace_aggkey_t *key;
+	uint32_t hashval = 0, limit, isstr;
+	caddr_t tomax, data, kdata;
+	dtrace_actkind_t action;
+	dtrace_action_t *act;
+	uintptr_t offs;
+
+	if (buf == NULL)
+		return;
+
+	if (!agg->dtag_hasarg) {
+		/*
+		 * Currently, only quantize() and lquantize() take additional
+		 * arguments, and they have the same semantics:  an increment
+		 * value that defaults to 1 when not present.  If additional
+		 * aggregating actions take arguments, the setting of the
+		 * default argument value will presumably have to become more
+		 * sophisticated...
+		 */
+		arg = 1;
+	}
+
+	action = agg->dtag_action.dta_kind - DTRACEACT_AGGREGATION;
+	size = rec->dtrd_offset - agg->dtag_base;
+	fsize = size + rec->dtrd_size;
+
+	ASSERT(dbuf->dtb_tomax != NULL);
+	data = dbuf->dtb_tomax + offset + agg->dtag_base;
+
+	if ((tomax = buf->dtb_tomax) == NULL) {
+		dtrace_buffer_drop(buf);
+		return;
+	}
+
+	/*
+	 * The metastructure is always at the bottom of the buffer.
+	 */
+	agb = (dtrace_aggbuffer_t *)(tomax + buf->dtb_size -
+	    sizeof (dtrace_aggbuffer_t));
+
+	if (buf->dtb_offset == 0) {
+		/*
+		 * We just kludge up approximately 1/8th of the size to be
+		 * buckets.  If this guess ends up being routinely
+		 * off-the-mark, we may need to dynamically readjust this
+		 * based on past performance.
+		 */
+		uintptr_t hashsize = (buf->dtb_size >> 3) / sizeof (uintptr_t);
+
+		if ((uintptr_t)agb - hashsize * sizeof (dtrace_aggkey_t *) <
+		    (uintptr_t)tomax || hashsize == 0) {
+			/*
+			 * We've been given a ludicrously small buffer;
+			 * increment our drop count and leave.
+			 */
+			dtrace_buffer_drop(buf);
+			return;
+		}
+
+		/*
+		 * And now, a pathetic attempt to try to get a an odd (or
+		 * perchance, a prime) hash size for better hash distribution.
+		 */
+		if (hashsize > (DTRACE_AGGHASHSIZE_SLEW << 3))
+			hashsize -= DTRACE_AGGHASHSIZE_SLEW;
+
+		agb->dtagb_hashsize = hashsize;
+		agb->dtagb_hash = (dtrace_aggkey_t **)((uintptr_t)agb -
+		    agb->dtagb_hashsize * sizeof (dtrace_aggkey_t *));
+		agb->dtagb_free = (uintptr_t)agb->dtagb_hash;
+
+		for (i = 0; i < agb->dtagb_hashsize; i++)
+			agb->dtagb_hash[i] = NULL;
+	}
+
+	ASSERT(agg->dtag_first != NULL);
+	ASSERT(agg->dtag_first->dta_intuple);
+
+	/*
+	 * Calculate the hash value based on the key.  Note that we _don't_
+	 * include the aggid in the hashing (but we will store it as part of
+	 * the key).  The hashing algorithm is Bob Jenkins' "One-at-a-time"
+	 * algorithm: a simple, quick algorithm that has no known funnels, and
+	 * gets good distribution in practice.  The efficacy of the hashing
+	 * algorithm (and a comparison with other algorithms) may be found by
+	 * running the ::dtrace_aggstat MDB dcmd.
+	 */
+	for (act = agg->dtag_first; act->dta_intuple; act = act->dta_next) {
+		i = act->dta_rec.dtrd_offset - agg->dtag_base;
+		limit = i + act->dta_rec.dtrd_size;
+		ASSERT(limit <= size);
+		isstr = DTRACEACT_ISSTRING(act);
+
+		for (; i < limit; i++) {
+			hashval += data[i];
+			hashval += (hashval << 10);
+			hashval ^= (hashval >> 6);
+
+			if (isstr && data[i] == '\0')
+				break;
+		}
+	}
+
+	hashval += (hashval << 3);
+	hashval ^= (hashval >> 11);
+	hashval += (hashval << 15);
+
+	/*
+	 * Yes, the divide here is expensive -- but it's generally the least
+	 * of the performance issues given the amount of data that we iterate
+	 * over to compute hash values, compare data, etc.
+	 */
+	ndx = hashval % agb->dtagb_hashsize;
+
+	for (key = agb->dtagb_hash[ndx]; key != NULL; key = key->dtak_next) {
+		ASSERT((caddr_t)key >= tomax);
+		ASSERT((caddr_t)key < tomax + buf->dtb_size);
+
+		if (hashval != key->dtak_hashval || key->dtak_size != size)
+			continue;
+
+		kdata = key->dtak_data;
+		ASSERT(kdata >= tomax && kdata < tomax + buf->dtb_size);
+
+		for (act = agg->dtag_first; act->dta_intuple;
+		    act = act->dta_next) {
+			i = act->dta_rec.dtrd_offset - agg->dtag_base;
+			limit = i + act->dta_rec.dtrd_size;
+			ASSERT(limit <= size);
+			isstr = DTRACEACT_ISSTRING(act);
+
+			for (; i < limit; i++) {
+				if (kdata[i] != data[i])
+					goto next;
+
+				if (isstr && data[i] == '\0')
+					break;
+			}
+		}
+
+		if (action != key->dtak_action) {
+			/*
+			 * We are aggregating on the same value in the same
+			 * aggregation with two different aggregating actions.
+			 * (This should have been picked up in the compiler,
+			 * so we may be dealing with errant or devious DIF.)
+			 * This is an error condition; we indicate as much,
+			 * and return.
+			 */
+			DTRACE_CPUFLAG_SET(CPU_DTRACE_ILLOP);
+			return;
+		}
+
+		/*
+		 * This is a hit:  we need to apply the aggregator to
+		 * the value at this key.
+		 */
+		agg->dtag_aggregate((uint64_t *)(kdata + size), expr, arg);
+		return;
+next:
+		continue;
+	}
+
+	/*
+	 * We didn't find it.  We need to allocate some zero-filled space,
+	 * link it into the hash table appropriately, and apply the aggregator
+	 * to the (zero-filled) value.
+	 */
+	offs = buf->dtb_offset;
+	while (offs & (align - 1))
+		offs += sizeof (uint32_t);
+
+	/*
+	 * If we don't have enough room to both allocate a new key _and_
+	 * its associated data, increment the drop count and return.
+	 */
+	if ((uintptr_t)tomax + offs + fsize >
+	    agb->dtagb_free - sizeof (dtrace_aggkey_t)) {
+		dtrace_buffer_drop(buf);
+		return;
+	}
+
+	/*CONSTCOND*/
+	ASSERT(!(sizeof (dtrace_aggkey_t) & (sizeof (uintptr_t) - 1)));
+	key = (dtrace_aggkey_t *)(agb->dtagb_free - sizeof (dtrace_aggkey_t));
+	agb->dtagb_free -= sizeof (dtrace_aggkey_t);
+
+	key->dtak_data = kdata = tomax + offs;
+	buf->dtb_offset = offs + fsize;
+
+	/*
+	 * Now copy the data across.
+	 */
+	*((dtrace_aggid_t *)kdata) = agg->dtag_id;
+
+	for (i = sizeof (dtrace_aggid_t); i < size; i++)
+		kdata[i] = data[i];
+
+	/*
+	 * Because strings are not zeroed out by default, we need to iterate
+	 * looking for actions that store strings, and we need to explicitly
+	 * pad these strings out with zeroes.
+	 */
+	for (act = agg->dtag_first; act->dta_intuple; act = act->dta_next) {
+		int nul;
+
+		if (!DTRACEACT_ISSTRING(act))
+			continue;
+
+		i = act->dta_rec.dtrd_offset - agg->dtag_base;
+		limit = i + act->dta_rec.dtrd_size;
+		ASSERT(limit <= size);
+
+		for (nul = 0; i < limit; i++) {
+			if (nul) {
+				kdata[i] = '\0';
+				continue;
+			}
+
+			if (data[i] != '\0')
+				continue;
+
+			nul = 1;
+		}
+	}
+
+	for (i = size; i < fsize; i++)
+		kdata[i] = 0;
+
+	key->dtak_hashval = hashval;
+	key->dtak_size = size;
+	key->dtak_action = action;
+	key->dtak_next = agb->dtagb_hash[ndx];
+	agb->dtagb_hash[ndx] = key;
+
+	/*
+	 * Finally, apply the aggregator.
+	 */
+	*((uint64_t *)(key->dtak_data + size)) = agg->dtag_initial;
+	agg->dtag_aggregate((uint64_t *)(key->dtak_data + size), expr, arg);
+}
+
+/*
+ * Given consumer state, this routine finds a speculation in the INACTIVE
+ * state and transitions it into the ACTIVE state.  If there is no speculation
+ * in the INACTIVE state, 0 is returned.  In this case, no error counter is
+ * incremented -- it is up to the caller to take appropriate action.
+ */
+static int
+dtrace_speculation(dtrace_state_t *state)
+{
+	int i = 0;
+	dtrace_speculation_state_t current;
+	uint32_t *stat = &state->dts_speculations_unavail, count;
+
+	while (i < state->dts_nspeculations) {
+		dtrace_speculation_t *spec = &state->dts_speculations[i];
+
+		current = spec->dtsp_state;
+
+		if (current != DTRACESPEC_INACTIVE) {
+			if (current == DTRACESPEC_COMMITTINGMANY ||
+			    current == DTRACESPEC_COMMITTING ||
+			    current == DTRACESPEC_DISCARDING)
+				stat = &state->dts_speculations_busy;
+			i++;
+			continue;
+		}
+
+		if (dtrace_cas32((uint32_t *)&spec->dtsp_state,
+		    current, DTRACESPEC_ACTIVE) == current)
+			return (i + 1);
+	}
+
+	/*
+	 * We couldn't find a speculation.  If we found as much as a single
+	 * busy speculation buffer, we'll attribute this failure as "busy"
+	 * instead of "unavail".
+	 */
+	do {
+		count = *stat;
+	} while (dtrace_cas32(stat, count, count + 1) != count);
+
+	return (0);
+}
+
+/*
+ * This routine commits an active speculation.  If the specified speculation
+ * is not in a valid state to perform a commit(), this routine will silently do
+ * nothing.  The state of the specified speculation is transitioned according
+ * to the state transition diagram outlined in <sys/dtrace_impl.h>
+ */
+static void
+dtrace_speculation_commit(dtrace_state_t *state, processorid_t cpu,
+    dtrace_specid_t which)
+{
+	dtrace_speculation_t *spec;
+	dtrace_buffer_t *src, *dest;
+	uintptr_t daddr, saddr, dlimit;
+	dtrace_speculation_state_t current, new;
+	intptr_t offs;
+
+	if (which == 0)
+		return;
+
+	if (which > state->dts_nspeculations) {
+		cpu_core[cpu].cpuc_dtrace_flags |= CPU_DTRACE_ILLOP;
+		return;
+	}
+
+	spec = &state->dts_speculations[which - 1];
+	src = &spec->dtsp_buffer[cpu];
+	dest = &state->dts_buffer[cpu];
+
+	do {
+		current = spec->dtsp_state;
+
+		if (current == DTRACESPEC_COMMITTINGMANY)
+			break;
+
+		switch (current) {
+		case DTRACESPEC_INACTIVE:
+		case DTRACESPEC_DISCARDING:
+			return;
+
+		case DTRACESPEC_COMMITTING:
+			/*
+			 * This is only possible if we are (a) commit()'ing
+			 * without having done a prior speculate() on this CPU
+			 * and (b) racing with another commit() on a different
+			 * CPU.  There's nothing to do -- we just assert that
+			 * our offset is 0.
+			 */
+			ASSERT(src->dtb_offset == 0);
+			return;
+
+		case DTRACESPEC_ACTIVE:
+			new = DTRACESPEC_COMMITTING;
+			break;
+
+		case DTRACESPEC_ACTIVEONE:
+			/*
+			 * This speculation is active on one CPU.  If our
+			 * buffer offset is non-zero, we know that the one CPU
+			 * must be us.  Otherwise, we are committing on a
+			 * different CPU from the speculate(), and we must
+			 * rely on being asynchronously cleaned.
+			 */
+			if (src->dtb_offset != 0) {
+				new = DTRACESPEC_COMMITTING;
+				break;
+			}
+			/*FALLTHROUGH*/
+
+		case DTRACESPEC_ACTIVEMANY:
+			new = DTRACESPEC_COMMITTINGMANY;
+			break;
+
+		default:
+			ASSERT(0);
+		}
+	} while (dtrace_cas32((uint32_t *)&spec->dtsp_state,
+	    current, new) != current);
+
+	/*
+	 * We have set the state to indicate that we are committing this
+	 * speculation.  Now reserve the necessary space in the destination
+	 * buffer.
+	 */
+	if ((offs = dtrace_buffer_reserve(dest, src->dtb_offset,
+	    sizeof (uint64_t), state, NULL)) < 0) {
+		dtrace_buffer_drop(dest);
+		goto out;
+	}
+
+	/*
+	 * We have the space; copy the buffer across.  (Note that this is a
+	 * highly subobtimal bcopy(); in the unlikely event that this becomes
+	 * a serious performance issue, a high-performance DTrace-specific
+	 * bcopy() should obviously be invented.)
+	 */
+	daddr = (uintptr_t)dest->dtb_tomax + offs;
+	dlimit = daddr + src->dtb_offset;
+	saddr = (uintptr_t)src->dtb_tomax;
+
+	/*
+	 * First, the aligned portion.
+	 */
+	while (dlimit - daddr >= sizeof (uint64_t)) {
+		*((uint64_t *)daddr) = *((uint64_t *)saddr);
+
+		daddr += sizeof (uint64_t);
+		saddr += sizeof (uint64_t);
+	}
+
+	/*
+	 * Now any left-over bit...
+	 */
+	while (dlimit - daddr)
+		*((uint8_t *)daddr++) = *((uint8_t *)saddr++);
+
+	/*
+	 * Finally, commit the reserved space in the destination buffer.
+	 */
+	dest->dtb_offset = offs + src->dtb_offset;
+
+out:
+	/*
+	 * If we're lucky enough to be the only active CPU on this speculation
+	 * buffer, we can just set the state back to DTRACESPEC_INACTIVE.
+	 */
+	if (current == DTRACESPEC_ACTIVE ||
+	    (current == DTRACESPEC_ACTIVEONE && new == DTRACESPEC_COMMITTING)) {
+		uint32_t rval = dtrace_cas32((uint32_t *)&spec->dtsp_state,
+		    DTRACESPEC_COMMITTING, DTRACESPEC_INACTIVE);
+
+		ASSERT(rval == DTRACESPEC_COMMITTING);
+	}
+
+	src->dtb_offset = 0;
+	src->dtb_xamot_drops += src->dtb_drops;
+	src->dtb_drops = 0;
+}
+
+/*
+ * This routine discards an active speculation.  If the specified speculation
+ * is not in a valid state to perform a discard(), this routine will silently
+ * do nothing.  The state of the specified speculation is transitioned
+ * according to the state transition diagram outlined in <sys/dtrace_impl.h>
+ */
+static void
+dtrace_speculation_discard(dtrace_state_t *state, processorid_t cpu,
+    dtrace_specid_t which)
+{
+	dtrace_speculation_t *spec;
+	dtrace_speculation_state_t current, new;
+	dtrace_buffer_t *buf;
+
+	if (which == 0)
+		return;
+
+	if (which > state->dts_nspeculations) {
+		cpu_core[cpu].cpuc_dtrace_flags |= CPU_DTRACE_ILLOP;
+		return;
+	}
+
+	spec = &state->dts_speculations[which - 1];
+	buf = &spec->dtsp_buffer[cpu];
+
+	do {
+		current = spec->dtsp_state;
+
+		switch (current) {
+		case DTRACESPEC_INACTIVE:
+		case DTRACESPEC_COMMITTINGMANY:
+		case DTRACESPEC_COMMITTING:
+		case DTRACESPEC_DISCARDING:
+			return;
+
+		case DTRACESPEC_ACTIVE:
+		case DTRACESPEC_ACTIVEMANY:
+			new = DTRACESPEC_DISCARDING;
+			break;
+
+		case DTRACESPEC_ACTIVEONE:
+			if (buf->dtb_offset != 0) {
+				new = DTRACESPEC_INACTIVE;
+			} else {
+				new = DTRACESPEC_DISCARDING;
+			}
+			break;
+
+		default:
+			ASSERT(0);
+		}
+	} while (dtrace_cas32((uint32_t *)&spec->dtsp_state,
+	    current, new) != current);
+
+	buf->dtb_offset = 0;
+	buf->dtb_drops = 0;
+}
+
+/*
+ * Note:  not called from probe context.  This function is called
+ * asynchronously from cross call context to clean any speculations that are
+ * in the COMMITTINGMANY or DISCARDING states.  These speculations may not be
+ * transitioned back to the INACTIVE state until all CPUs have cleaned the
+ * speculation.
+ */
+static void
+dtrace_speculation_clean_here(dtrace_state_t *state)
+{
+	dtrace_icookie_t cookie;
+	processorid_t cpu = CPU->cpu_id;
+	dtrace_buffer_t *dest = &state->dts_buffer[cpu];
+	dtrace_specid_t i;
+
+	cookie = dtrace_interrupt_disable();
+
+	if (dest->dtb_tomax == NULL) {
+		dtrace_interrupt_enable(cookie);
+		return;
+	}
+
+	for (i = 0; i < state->dts_nspeculations; i++) {
+		dtrace_speculation_t *spec = &state->dts_speculations[i];
+		dtrace_buffer_t *src = &spec->dtsp_buffer[cpu];
+
+		if (src->dtb_tomax == NULL)
+			continue;
+
+		if (spec->dtsp_state == DTRACESPEC_DISCARDING) {
+			src->dtb_offset = 0;
+			continue;
+		}
+
+		if (spec->dtsp_state != DTRACESPEC_COMMITTINGMANY)
+			continue;
+
+		if (src->dtb_offset == 0)
+			continue;
+
+		dtrace_speculation_commit(state, cpu, i + 1);
+	}
+
+	dtrace_interrupt_enable(cookie);
+}
+
+/*
+ * Note:  not called from probe context.  This function is called
+ * asynchronously (and at a regular interval) to clean any speculations that
+ * are in the COMMITTINGMANY or DISCARDING states.  If it discovers that there
+ * is work to be done, it cross calls all CPUs to perform that work;
+ * COMMITMANY and DISCARDING speculations may not be transitioned back to the
+ * INACTIVE state until they have been cleaned by all CPUs.
+ */
+static void
+dtrace_speculation_clean(dtrace_state_t *state)
+{
+	int work = 0, rv;
+	dtrace_specid_t i;
+
+	for (i = 0; i < state->dts_nspeculations; i++) {
+		dtrace_speculation_t *spec = &state->dts_speculations[i];
+
+		ASSERT(!spec->dtsp_cleaning);
+
+		if (spec->dtsp_state != DTRACESPEC_DISCARDING &&
+		    spec->dtsp_state != DTRACESPEC_COMMITTINGMANY)
+			continue;
+
+		work++;
+		spec->dtsp_cleaning = 1;
+	}
+
+	if (!work)
+		return;
+
+	dtrace_xcall(DTRACE_CPUALL,
+	    (dtrace_xcall_t)dtrace_speculation_clean_here, state);
+
+	/*
+	 * We now know that all CPUs have committed or discarded their
+	 * speculation buffers, as appropriate.  We can now set the state
+	 * to inactive.
+	 */
+	for (i = 0; i < state->dts_nspeculations; i++) {
+		dtrace_speculation_t *spec = &state->dts_speculations[i];
+		dtrace_speculation_state_t current, new;
+
+		if (!spec->dtsp_cleaning)
+			continue;
+
+		current = spec->dtsp_state;
+		ASSERT(current == DTRACESPEC_DISCARDING ||
+		    current == DTRACESPEC_COMMITTINGMANY);
+
+		new = DTRACESPEC_INACTIVE;
+
+		rv = dtrace_cas32((uint32_t *)&spec->dtsp_state, current, new);
+		ASSERT(rv == current);
+		spec->dtsp_cleaning = 0;
+	}
+}
+
+/*
+ * Called as part of a speculate() to get the speculative buffer associated
+ * with a given speculation.  Returns NULL if the specified speculation is not
+ * in an ACTIVE state.  If the speculation is in the ACTIVEONE state -- and
+ * the active CPU is not the specified CPU -- the speculation will be
+ * atomically transitioned into the ACTIVEMANY state.
+ */
+static dtrace_buffer_t *
+dtrace_speculation_buffer(dtrace_state_t *state, processorid_t cpuid,
+    dtrace_specid_t which)
+{
+	dtrace_speculation_t *spec;
+	dtrace_speculation_state_t current, new;
+	dtrace_buffer_t *buf;
+
+	if (which == 0)
+		return (NULL);
+
+	if (which > state->dts_nspeculations) {
+		cpu_core[cpuid].cpuc_dtrace_flags |= CPU_DTRACE_ILLOP;
+		return (NULL);
+	}
+
+	spec = &state->dts_speculations[which - 1];
+	buf = &spec->dtsp_buffer[cpuid];
+
+	do {
+		current = spec->dtsp_state;
+
+		switch (current) {
+		case DTRACESPEC_INACTIVE:
+		case DTRACESPEC_COMMITTINGMANY:
+		case DTRACESPEC_DISCARDING:
+			return (NULL);
+
+		case DTRACESPEC_COMMITTING:
+			ASSERT(buf->dtb_offset == 0);
+			return (NULL);
+
+		case DTRACESPEC_ACTIVEONE:
+			/*
+			 * This speculation is currently active on one CPU.
+			 * Check the offset in the buffer; if it's non-zero,
+			 * that CPU must be us (and we leave the state alone).
+			 * If it's zero, assume that we're starting on a new
+			 * CPU -- and change the state to indicate that the
+			 * speculation is active on more than one CPU.
+			 */
+			if (buf->dtb_offset != 0)
+				return (buf);
+
+			new = DTRACESPEC_ACTIVEMANY;
+			break;
+
+		case DTRACESPEC_ACTIVEMANY:
+			return (buf);
+
+		case DTRACESPEC_ACTIVE:
+			new = DTRACESPEC_ACTIVEONE;
+			break;
+
+		default:
+			ASSERT(0);
+		}
+	} while (dtrace_cas32((uint32_t *)&spec->dtsp_state,
+	    current, new) != current);
+
+	ASSERT(new == DTRACESPEC_ACTIVEONE || new == DTRACESPEC_ACTIVEMANY);
+	return (buf);
+}
+
+/*
+ * Return a string.  In the event that the user lacks the privilege to access
+ * arbitrary kernel memory, we copy the string out to scratch memory so that we
+ * don't fail access checking.
+ *
+ * dtrace_dif_variable() uses this routine as a helper for various
+ * builtin values such as 'execname' and 'probefunc.'
+ */
+uintptr_t
+dtrace_dif_varstr(uintptr_t addr, dtrace_state_t *state,
+    dtrace_mstate_t *mstate)
+{
+	uint64_t size = state->dts_options[DTRACEOPT_STRSIZE];
+	uintptr_t ret;
+	size_t strsz;
+
+	/*
+	 * The easy case: this probe is allowed to read all of memory, so
+	 * we can just return this as a vanilla pointer.
+	 */
+	if ((mstate->dtms_access & DTRACE_ACCESS_KERNEL) != 0)
+		return (addr);
+
+	/*
+	 * This is the tougher case: we copy the string in question from
+	 * kernel memory into scratch memory and return it that way: this
+	 * ensures that we won't trip up when access checking tests the
+	 * BYREF return value.
+	 */
+	strsz = dtrace_strlen((char *)addr, size) + 1;
+
+	if (mstate->dtms_scratch_ptr + strsz >
+	    mstate->dtms_scratch_base + mstate->dtms_scratch_size) {
+		DTRACE_CPUFLAG_SET(CPU_DTRACE_NOSCRATCH);
+		return (NULL);
+	}
+
+	dtrace_strcpy((const void *)addr, (void *)mstate->dtms_scratch_ptr,
+	    strsz);
+	ret = mstate->dtms_scratch_ptr;
+	mstate->dtms_scratch_ptr += strsz;
+	return (ret);
+}
+
+/*
+ * This function implements the DIF emulator's variable lookups.  The emulator
+ * passes a reserved variable identifier and optional built-in array index.
+ */
+static uint64_t
+dtrace_dif_variable(dtrace_mstate_t *mstate, dtrace_state_t *state, uint64_t v,
+    uint64_t ndx)
+{
+	/*
+	 * If we're accessing one of the uncached arguments, we'll turn this
+	 * into a reference in the args array.
+	 */
+	if (v >= DIF_VAR_ARG0 && v <= DIF_VAR_ARG9) {
+		ndx = v - DIF_VAR_ARG0;
+		v = DIF_VAR_ARGS;
+	}
+
+	switch (v) {
+	case DIF_VAR_ARGS:
+		ASSERT(mstate->dtms_present & DTRACE_MSTATE_ARGS);
+		if (ndx >= sizeof (mstate->dtms_arg) /
+		    sizeof (mstate->dtms_arg[0])) {
+			int aframes = mstate->dtms_probe->dtpr_aframes + 2;
+			dtrace_provider_t *pv;
+			uint64_t val;
+
+			pv = mstate->dtms_probe->dtpr_provider;
+			if (pv->dtpv_pops.dtps_getargval != NULL)
+				val = pv->dtpv_pops.dtps_getargval(pv->dtpv_arg,
+				    mstate->dtms_probe->dtpr_id,
+				    mstate->dtms_probe->dtpr_arg, ndx, aframes);
+			else
+				val = dtrace_getarg(ndx, aframes);
+
+			/*
+			 * This is regrettably required to keep the compiler
+			 * from tail-optimizing the call to dtrace_getarg().
+			 * The condition always evaluates to true, but the
+			 * compiler has no way of figuring that out a priori.
+			 * (None of this would be necessary if the compiler
+			 * could be relied upon to _always_ tail-optimize
+			 * the call to dtrace_getarg() -- but it can't.)
+			 */
+			if (mstate->dtms_probe != NULL)
+				return (val);
+
+			ASSERT(0);
+		}
+
+		return (mstate->dtms_arg[ndx]);
+
+	case DIF_VAR_UREGS: {
+		klwp_t *lwp;
+
+		if (!dtrace_priv_proc(state))
+			return (0);
+
+		if ((lwp = curthread->t_lwp) == NULL) {
+			DTRACE_CPUFLAG_SET(CPU_DTRACE_BADADDR);
+			cpu_core[CPU->cpu_id].cpuc_dtrace_illval = NULL;
+			return (0);
+		}
+
+		return (dtrace_getreg(lwp->lwp_regs, ndx));
+	}
+
+	case DIF_VAR_CURTHREAD:
+		if (!dtrace_priv_kernel(state))
+			return (0);
+		return ((uint64_t)(uintptr_t)curthread);
+
+	case DIF_VAR_TIMESTAMP:
+		if (!(mstate->dtms_present & DTRACE_MSTATE_TIMESTAMP)) {
+			mstate->dtms_timestamp = dtrace_gethrtime();
+			mstate->dtms_present |= DTRACE_MSTATE_TIMESTAMP;
+		}
+		return (mstate->dtms_timestamp);
+
+	case DIF_VAR_VTIMESTAMP:
+		ASSERT(dtrace_vtime_references != 0);
+		return (curthread->t_dtrace_vtime);
+
+	case DIF_VAR_WALLTIMESTAMP:
+		if (!(mstate->dtms_present & DTRACE_MSTATE_WALLTIMESTAMP)) {
+			mstate->dtms_walltimestamp = dtrace_gethrestime();
+			mstate->dtms_present |= DTRACE_MSTATE_WALLTIMESTAMP;
+		}
+		return (mstate->dtms_walltimestamp);
+
+	case DIF_VAR_IPL:
+		if (!dtrace_priv_kernel(state))
+			return (0);
+		if (!(mstate->dtms_present & DTRACE_MSTATE_IPL)) {
+			mstate->dtms_ipl = dtrace_getipl();
+			mstate->dtms_present |= DTRACE_MSTATE_IPL;
+		}
+		return (mstate->dtms_ipl);
+
+	case DIF_VAR_EPID:
+		ASSERT(mstate->dtms_present & DTRACE_MSTATE_EPID);
+		return (mstate->dtms_epid);
+
+	case DIF_VAR_ID:
+		ASSERT(mstate->dtms_present & DTRACE_MSTATE_PROBE);
+		return (mstate->dtms_probe->dtpr_id);
+
+	case DIF_VAR_STACKDEPTH:
+		if (!dtrace_priv_kernel(state))
+			return (0);
+		if (!(mstate->dtms_present & DTRACE_MSTATE_STACKDEPTH)) {
+			int aframes = mstate->dtms_probe->dtpr_aframes + 2;
+
+			mstate->dtms_stackdepth = dtrace_getstackdepth(aframes);
+			mstate->dtms_present |= DTRACE_MSTATE_STACKDEPTH;
+		}
+		return (mstate->dtms_stackdepth);
+
+	case DIF_VAR_USTACKDEPTH:
+		if (!dtrace_priv_proc(state))
+			return (0);
+		if (!(mstate->dtms_present & DTRACE_MSTATE_USTACKDEPTH)) {
+			/*
+			 * See comment in DIF_VAR_PID.
+			 */
+			if (DTRACE_ANCHORED(mstate->dtms_probe) &&
+			    CPU_ON_INTR(CPU)) {
+				mstate->dtms_ustackdepth = 0;
+			} else {
+				DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT);
+				mstate->dtms_ustackdepth =
+				    dtrace_getustackdepth();
+				DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT);
+			}
+			mstate->dtms_present |= DTRACE_MSTATE_USTACKDEPTH;
+		}
+		return (mstate->dtms_ustackdepth);
+
+	case DIF_VAR_CALLER:
+		if (!dtrace_priv_kernel(state))
+			return (0);
+		if (!(mstate->dtms_present & DTRACE_MSTATE_CALLER)) {
+			int aframes = mstate->dtms_probe->dtpr_aframes + 2;
+
+			if (!DTRACE_ANCHORED(mstate->dtms_probe)) {
+				/*
+				 * If this is an unanchored probe, we are
+				 * required to go through the slow path:
+				 * dtrace_caller() only guarantees correct
+				 * results for anchored probes.
+				 */
+				pc_t caller[2];
+
+				dtrace_getpcstack(caller, 2, aframes,
+				    (uint32_t *)(uintptr_t)mstate->dtms_arg[0]);
+				mstate->dtms_caller = caller[1];
+			} else if ((mstate->dtms_caller =
+			    dtrace_caller(aframes)) == -1) {
+				/*
+				 * We have failed to do this the quick way;
+				 * we must resort to the slower approach of
+				 * calling dtrace_getpcstack().
+				 */
+				pc_t caller;
+
+				dtrace_getpcstack(&caller, 1, aframes, NULL);
+				mstate->dtms_caller = caller;
+			}
+
+			mstate->dtms_present |= DTRACE_MSTATE_CALLER;
+		}
+		return (mstate->dtms_caller);
+
+	case DIF_VAR_UCALLER:
+		if (!dtrace_priv_proc(state))
+			return (0);
+
+		if (!(mstate->dtms_present & DTRACE_MSTATE_UCALLER)) {
+			uint64_t ustack[3];
+
+			/*
+			 * dtrace_getupcstack() fills in the first uint64_t
+			 * with the current PID.  The second uint64_t will
+			 * be the program counter at user-level.  The third
+			 * uint64_t will contain the caller, which is what
+			 * we're after.
+			 */
+			ustack[2] = NULL;
+			DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT);
+			dtrace_getupcstack(ustack, 3);
+			DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT);
+			mstate->dtms_ucaller = ustack[2];
+			mstate->dtms_present |= DTRACE_MSTATE_UCALLER;
+		}
+
+		return (mstate->dtms_ucaller);
+
+	case DIF_VAR_PROBEPROV:
+		ASSERT(mstate->dtms_present & DTRACE_MSTATE_PROBE);
+		return (dtrace_dif_varstr(
+		    (uintptr_t)mstate->dtms_probe->dtpr_provider->dtpv_name,
+		    state, mstate));
+
+	case DIF_VAR_PROBEMOD:
+		ASSERT(mstate->dtms_present & DTRACE_MSTATE_PROBE);
+		return (dtrace_dif_varstr(
+		    (uintptr_t)mstate->dtms_probe->dtpr_mod,
+		    state, mstate));
+
+	case DIF_VAR_PROBEFUNC:
+		ASSERT(mstate->dtms_present & DTRACE_MSTATE_PROBE);
+		return (dtrace_dif_varstr(
+		    (uintptr_t)mstate->dtms_probe->dtpr_func,
+		    state, mstate));
+
+	case DIF_VAR_PROBENAME:
+		ASSERT(mstate->dtms_present & DTRACE_MSTATE_PROBE);
+		return (dtrace_dif_varstr(
+		    (uintptr_t)mstate->dtms_probe->dtpr_name,
+		    state, mstate));
+
+	case DIF_VAR_PID:
+		if (!dtrace_priv_proc(state))
+			return (0);
+
+		/*
+		 * Note that we are assuming that an unanchored probe is
+		 * always due to a high-level interrupt.  (And we're assuming
+		 * that there is only a single high level interrupt.)
+		 */
+		if (DTRACE_ANCHORED(mstate->dtms_probe) && CPU_ON_INTR(CPU))
+			return (pid0.pid_id);
+
+		/*
+		 * It is always safe to dereference one's own t_procp pointer:
+		 * it always points to a valid, allocated proc structure.
+		 * Further, it is always safe to dereference the p_pidp member
+		 * of one's own proc structure.  (These are truisms becuase
+		 * threads and processes don't clean up their own state --
+		 * they leave that task to whomever reaps them.)
+		 */
+		return ((uint64_t)curthread->t_procp->p_pidp->pid_id);
+
+	case DIF_VAR_PPID:
+		if (!dtrace_priv_proc(state))
+			return (0);
+
+		/*
+		 * See comment in DIF_VAR_PID.
+		 */
+		if (DTRACE_ANCHORED(mstate->dtms_probe) && CPU_ON_INTR(CPU))
+			return (pid0.pid_id);
+
+		/*
+		 * It is always safe to dereference one's own t_procp pointer:
+		 * it always points to a valid, allocated proc structure.
+		 * (This is true because threads don't clean up their own
+		 * state -- they leave that task to whomever reaps them.)
+		 */
+		return ((uint64_t)curthread->t_procp->p_ppid);
+
+	case DIF_VAR_TID:
+		/*
+		 * See comment in DIF_VAR_PID.
+		 */
+		if (DTRACE_ANCHORED(mstate->dtms_probe) && CPU_ON_INTR(CPU))
+			return (0);
+
+		return ((uint64_t)curthread->t_tid);
+
+	case DIF_VAR_EXECNAME:
+		if (!dtrace_priv_proc(state))
+			return (0);
+
+		/*
+		 * See comment in DIF_VAR_PID.
+		 */
+		if (DTRACE_ANCHORED(mstate->dtms_probe) && CPU_ON_INTR(CPU))
+			return ((uint64_t)(uintptr_t)p0.p_user.u_comm);
+
+		/*
+		 * It is always safe to dereference one's own t_procp pointer:
+		 * it always points to a valid, allocated proc structure.
+		 * (This is true because threads don't clean up their own
+		 * state -- they leave that task to whomever reaps them.)
+		 */
+		return (dtrace_dif_varstr(
+		    (uintptr_t)curthread->t_procp->p_user.u_comm,
+		    state, mstate));
+
+	case DIF_VAR_ZONENAME:
+		if (!dtrace_priv_proc(state))
+			return (0);
+
+		/*
+		 * See comment in DIF_VAR_PID.
+		 */
+		if (DTRACE_ANCHORED(mstate->dtms_probe) && CPU_ON_INTR(CPU))
+			return ((uint64_t)(uintptr_t)p0.p_zone->zone_name);
+
+		/*
+		 * It is always safe to dereference one's own t_procp pointer:
+		 * it always points to a valid, allocated proc structure.
+		 * (This is true because threads don't clean up their own
+		 * state -- they leave that task to whomever reaps them.)
+		 */
+		return (dtrace_dif_varstr(
+		    (uintptr_t)curthread->t_procp->p_zone->zone_name,
+		    state, mstate));
+
+	case DIF_VAR_UID:
+		if (!dtrace_priv_proc(state))
+			return (0);
+
+		/*
+		 * See comment in DIF_VAR_PID.
+		 */
+		if (DTRACE_ANCHORED(mstate->dtms_probe) && CPU_ON_INTR(CPU))
+			return ((uint64_t)p0.p_cred->cr_uid);
+
+		/*
+		 * It is always safe to dereference one's own t_procp pointer:
+		 * it always points to a valid, allocated proc structure.
+		 * (This is true because threads don't clean up their own
+		 * state -- they leave that task to whomever reaps them.)
+		 *
+		 * Additionally, it is safe to dereference one's own process
+		 * credential, since this is never NULL after process birth.
+		 */
+		return ((uint64_t)curthread->t_procp->p_cred->cr_uid);
+
+	case DIF_VAR_GID:
+		if (!dtrace_priv_proc(state))
+			return (0);
+
+		/*
+		 * See comment in DIF_VAR_PID.
+		 */
+		if (DTRACE_ANCHORED(mstate->dtms_probe) && CPU_ON_INTR(CPU))
+			return ((uint64_t)p0.p_cred->cr_gid);
+
+		/*
+		 * It is always safe to dereference one's own t_procp pointer:
+		 * it always points to a valid, allocated proc structure.
+		 * (This is true because threads don't clean up their own
+		 * state -- they leave that task to whomever reaps them.)
+		 *
+		 * Additionally, it is safe to dereference one's own process
+		 * credential, since this is never NULL after process birth.
+		 */
+		return ((uint64_t)curthread->t_procp->p_cred->cr_gid);
+
+	case DIF_VAR_ERRNO: {
+		klwp_t *lwp;
+		if (!dtrace_priv_proc(state))
+			return (0);
+
+		/*
+		 * See comment in DIF_VAR_PID.
+		 */
+		if (DTRACE_ANCHORED(mstate->dtms_probe) && CPU_ON_INTR(CPU))
+			return (0);
+
+		/*
+		 * It is always safe to dereference one's own t_lwp pointer in
+		 * the event that this pointer is non-NULL.  (This is true
+		 * because threads and lwps don't clean up their own state --
+		 * they leave that task to whomever reaps them.)
+		 */
+		if ((lwp = curthread->t_lwp) == NULL)
+			return (0);
+
+		return ((uint64_t)lwp->lwp_errno);
+	}
+	default:
+		DTRACE_CPUFLAG_SET(CPU_DTRACE_ILLOP);
+		return (0);
+	}
+}
+
+/*
+ * Emulate the execution of DTrace ID subroutines invoked by the call opcode.
+ * Notice that we don't bother validating the proper number of arguments or
+ * their types in the tuple stack.  This isn't needed because all argument
+ * interpretation is safe because of our load safety -- the worst that can
+ * happen is that a bogus program can obtain bogus results.
+ */
+static void
+dtrace_dif_subr(uint_t subr, uint_t rd, uint64_t *regs,
+    dtrace_key_t *tupregs, int nargs,
+    dtrace_mstate_t *mstate, dtrace_state_t *state)
+{
+	volatile uint16_t *flags = &cpu_core[CPU->cpu_id].cpuc_dtrace_flags;
+	volatile uintptr_t *illval = &cpu_core[CPU->cpu_id].cpuc_dtrace_illval;
+	dtrace_vstate_t *vstate = &state->dts_vstate;
+
+	union {
+		mutex_impl_t mi;
+		uint64_t mx;
+	} m;
+
+	union {
+		krwlock_t ri;
+		uintptr_t rw;
+	} r;
+
+	switch (subr) {
+	case DIF_SUBR_RAND:
+		regs[rd] = (dtrace_gethrtime() * 2416 + 374441) % 1771875;
+		break;
+
+	case DIF_SUBR_MUTEX_OWNED:
+		if (!dtrace_canload(tupregs[0].dttk_value, sizeof (kmutex_t),
+		    mstate, vstate)) {
+			regs[rd] = NULL;
+			break;
+		}
+
+		m.mx = dtrace_load64(tupregs[0].dttk_value);
+		if (MUTEX_TYPE_ADAPTIVE(&m.mi))
+			regs[rd] = MUTEX_OWNER(&m.mi) != MUTEX_NO_OWNER;
+		else
+			regs[rd] = LOCK_HELD(&m.mi.m_spin.m_spinlock);
+		break;
+
+	case DIF_SUBR_MUTEX_OWNER:
+		if (!dtrace_canload(tupregs[0].dttk_value, sizeof (kmutex_t),
+		    mstate, vstate)) {
+			regs[rd] = NULL;
+			break;
+		}
+
+		m.mx = dtrace_load64(tupregs[0].dttk_value);
+		if (MUTEX_TYPE_ADAPTIVE(&m.mi) &&
+		    MUTEX_OWNER(&m.mi) != MUTEX_NO_OWNER)
+			regs[rd] = (uintptr_t)MUTEX_OWNER(&m.mi);
+		else
+			regs[rd] = 0;
+		break;
+
+	case DIF_SUBR_MUTEX_TYPE_ADAPTIVE:
+		if (!dtrace_canload(tupregs[0].dttk_value, sizeof (kmutex_t),
+		    mstate, vstate)) {
+			regs[rd] = NULL;
+			break;
+		}
+
+		m.mx = dtrace_load64(tupregs[0].dttk_value);
+		regs[rd] = MUTEX_TYPE_ADAPTIVE(&m.mi);
+		break;
+
+	case DIF_SUBR_MUTEX_TYPE_SPIN:
+		if (!dtrace_canload(tupregs[0].dttk_value, sizeof (kmutex_t),
+		    mstate, vstate)) {
+			regs[rd] = NULL;
+			break;
+		}
+
+		m.mx = dtrace_load64(tupregs[0].dttk_value);
+		regs[rd] = MUTEX_TYPE_SPIN(&m.mi);
+		break;
+
+	case DIF_SUBR_RW_READ_HELD: {
+		uintptr_t tmp;
+
+		if (!dtrace_canload(tupregs[0].dttk_value, sizeof (uintptr_t),
+		    mstate, vstate)) {
+			regs[rd] = NULL;
+			break;
+		}
+
+		r.rw = dtrace_loadptr(tupregs[0].dttk_value);
+		regs[rd] = _RW_READ_HELD(&r.ri, tmp);
+		break;
+	}
+
+	case DIF_SUBR_RW_WRITE_HELD:
+		if (!dtrace_canload(tupregs[0].dttk_value, sizeof (krwlock_t),
+		    mstate, vstate)) {
+			regs[rd] = NULL;
+			break;
+		}
+
+		r.rw = dtrace_loadptr(tupregs[0].dttk_value);
+		regs[rd] = _RW_WRITE_HELD(&r.ri);
+		break;
+
+	case DIF_SUBR_RW_ISWRITER:
+		if (!dtrace_canload(tupregs[0].dttk_value, sizeof (krwlock_t),
+		    mstate, vstate)) {
+			regs[rd] = NULL;
+			break;
+		}
+
+		r.rw = dtrace_loadptr(tupregs[0].dttk_value);
+		regs[rd] = _RW_ISWRITER(&r.ri);
+		break;
+
+	case DIF_SUBR_BCOPY: {
+		/*
+		 * We need to be sure that the destination is in the scratch
+		 * region -- no other region is allowed.
+		 */
+		uintptr_t src = tupregs[0].dttk_value;
+		uintptr_t dest = tupregs[1].dttk_value;
+		size_t size = tupregs[2].dttk_value;
+
+		if (!dtrace_inscratch(dest, size, mstate)) {
+			*flags |= CPU_DTRACE_BADADDR;
+			*illval = regs[rd];
+			break;
+		}
+
+		if (!dtrace_canload(src, size, mstate, vstate)) {
+			regs[rd] = NULL;
+			break;
+		}
+
+		dtrace_bcopy((void *)src, (void *)dest, size);
+		break;
+	}
+
+	case DIF_SUBR_ALLOCA:
+	case DIF_SUBR_COPYIN: {
+		uintptr_t dest = P2ROUNDUP(mstate->dtms_scratch_ptr, 8);
+		uint64_t size =
+		    tupregs[subr == DIF_SUBR_ALLOCA ? 0 : 1].dttk_value;
+		size_t scratch_size = (dest - mstate->dtms_scratch_ptr) + size;
+
+		/*
+		 * This action doesn't require any credential checks since
+		 * probes will not activate in user contexts to which the
+		 * enabling user does not have permissions.
+		 */
+
+		/*
+		 * Rounding up the user allocation size could have overflowed
+		 * a large, bogus allocation (like -1ULL) to 0.
+		 */
+		if (scratch_size < size ||
+		    !DTRACE_INSCRATCH(mstate, scratch_size)) {
+			DTRACE_CPUFLAG_SET(CPU_DTRACE_NOSCRATCH);
+			regs[rd] = NULL;
+			break;
+		}
+
+		if (subr == DIF_SUBR_COPYIN) {
+			DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT);
+			dtrace_copyin(tupregs[0].dttk_value, dest, size, flags);
+			DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT);
+		}
+
+		mstate->dtms_scratch_ptr += scratch_size;
+		regs[rd] = dest;
+		break;
+	}
+
+	case DIF_SUBR_COPYINTO: {
+		uint64_t size = tupregs[1].dttk_value;
+		uintptr_t dest = tupregs[2].dttk_value;
+
+		/*
+		 * This action doesn't require any credential checks since
+		 * probes will not activate in user contexts to which the
+		 * enabling user does not have permissions.
+		 */
+		if (!dtrace_inscratch(dest, size, mstate)) {
+			*flags |= CPU_DTRACE_BADADDR;
+			*illval = regs[rd];
+			break;
+		}
+
+		DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT);
+		dtrace_copyin(tupregs[0].dttk_value, dest, size, flags);
+		DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT);
+		break;
+	}
+
+	case DIF_SUBR_COPYINSTR: {
+		uintptr_t dest = mstate->dtms_scratch_ptr;
+		uint64_t size = state->dts_options[DTRACEOPT_STRSIZE];
+
+		if (nargs > 1 && tupregs[1].dttk_value < size)
+			size = tupregs[1].dttk_value + 1;
+
+		/*
+		 * This action doesn't require any credential checks since
+		 * probes will not activate in user contexts to which the
+		 * enabling user does not have permissions.
+		 */
+		if (!DTRACE_INSCRATCH(mstate, size)) {
+			DTRACE_CPUFLAG_SET(CPU_DTRACE_NOSCRATCH);
+			regs[rd] = NULL;
+			break;
+		}
+
+		DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT);
+		dtrace_copyinstr(tupregs[0].dttk_value, dest, size, flags);
+		DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT);
+
+		((char *)dest)[size - 1] = '\0';
+		mstate->dtms_scratch_ptr += size;
+		regs[rd] = dest;
+		break;
+	}
+
+	case DIF_SUBR_MSGSIZE:
+	case DIF_SUBR_MSGDSIZE: {
+		uintptr_t baddr = tupregs[0].dttk_value, daddr;
+		uintptr_t wptr, rptr;
+		size_t count = 0;
+		int cont = 0;
+
+		while (baddr != NULL && !(*flags & CPU_DTRACE_FAULT)) {
+
+			if (!dtrace_canload(baddr, sizeof (mblk_t), mstate,
+			    vstate)) {
+				regs[rd] = NULL;
+				break;
+			}
+
+			wptr = dtrace_loadptr(baddr +
+			    offsetof(mblk_t, b_wptr));
+
+			rptr = dtrace_loadptr(baddr +
+			    offsetof(mblk_t, b_rptr));
+
+			if (wptr < rptr) {
+				*flags |= CPU_DTRACE_BADADDR;
+				*illval = tupregs[0].dttk_value;
+				break;
+			}
+
+			daddr = dtrace_loadptr(baddr +
+			    offsetof(mblk_t, b_datap));
+
+			baddr = dtrace_loadptr(baddr +
+			    offsetof(mblk_t, b_cont));
+
+			/*
+			 * We want to prevent against denial-of-service here,
+			 * so we're only going to search the list for
+			 * dtrace_msgdsize_max mblks.
+			 */
+			if (cont++ > dtrace_msgdsize_max) {
+				*flags |= CPU_DTRACE_ILLOP;
+				break;
+			}
+
+			if (subr == DIF_SUBR_MSGDSIZE) {
+				if (dtrace_load8(daddr +
+				    offsetof(dblk_t, db_type)) != M_DATA)
+					continue;
+			}
+
+			count += wptr - rptr;
+		}
+
+		if (!(*flags & CPU_DTRACE_FAULT))
+			regs[rd] = count;
+
+		break;
+	}
+
+	case DIF_SUBR_PROGENYOF: {
+		pid_t pid = tupregs[0].dttk_value;
+		proc_t *p;
+		int rval = 0;
+
+		DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT);
+
+		for (p = curthread->t_procp; p != NULL; p = p->p_parent) {
+			if (p->p_pidp->pid_id == pid) {
+				rval = 1;
+				break;
+			}
+		}
+
+		DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT);
+
+		regs[rd] = rval;
+		break;
+	}
+
+	case DIF_SUBR_SPECULATION:
+		regs[rd] = dtrace_speculation(state);
+		break;
+
+	case DIF_SUBR_COPYOUT: {
+		uintptr_t kaddr = tupregs[0].dttk_value;
+		uintptr_t uaddr = tupregs[1].dttk_value;
+		uint64_t size = tupregs[2].dttk_value;
+
+		if (!dtrace_destructive_disallow &&
+		    dtrace_priv_proc_control(state) &&
+		    !dtrace_istoxic(kaddr, size)) {
+			DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT);
+			dtrace_copyout(kaddr, uaddr, size, flags);
+			DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT);
+		}
+		break;
+	}
+
+	case DIF_SUBR_COPYOUTSTR: {
+		uintptr_t kaddr = tupregs[0].dttk_value;
+		uintptr_t uaddr = tupregs[1].dttk_value;
+		uint64_t size = tupregs[2].dttk_value;
+
+		if (!dtrace_destructive_disallow &&
+		    dtrace_priv_proc_control(state) &&
+		    !dtrace_istoxic(kaddr, size)) {
+			DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT);
+			dtrace_copyoutstr(kaddr, uaddr, size, flags);
+			DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT);
+		}
+		break;
+	}
+
+	case DIF_SUBR_STRLEN: {
+		size_t sz;
+		uintptr_t addr = (uintptr_t)tupregs[0].dttk_value;
+		sz = dtrace_strlen((char *)addr,
+		    state->dts_options[DTRACEOPT_STRSIZE]);
+
+		if (!dtrace_canload(addr, sz + 1, mstate, vstate)) {
+			regs[rd] = NULL;
+			break;
+		}
+
+		regs[rd] = sz;
+
+		break;
+	}
+
+	case DIF_SUBR_STRCHR:
+	case DIF_SUBR_STRRCHR: {
+		/*
+		 * We're going to iterate over the string looking for the
+		 * specified character.  We will iterate until we have reached
+		 * the string length or we have found the character.  If this
+		 * is DIF_SUBR_STRRCHR, we will look for the last occurrence
+		 * of the specified character instead of the first.
+		 */
+		uintptr_t saddr = tupregs[0].dttk_value;
+		uintptr_t addr = tupregs[0].dttk_value;
+		uintptr_t limit = addr + state->dts_options[DTRACEOPT_STRSIZE];
+		char c, target = (char)tupregs[1].dttk_value;
+
+		for (regs[rd] = NULL; addr < limit; addr++) {
+			if ((c = dtrace_load8(addr)) == target) {
+				regs[rd] = addr;
+
+				if (subr == DIF_SUBR_STRCHR)
+					break;
+			}
+
+			if (c == '\0')
+				break;
+		}
+
+		if (!dtrace_canload(saddr, addr - saddr, mstate, vstate)) {
+			regs[rd] = NULL;
+			break;
+		}
+
+		break;
+	}
+
+	case DIF_SUBR_STRSTR:
+	case DIF_SUBR_INDEX:
+	case DIF_SUBR_RINDEX: {
+		/*
+		 * We're going to iterate over the string looking for the
+		 * specified string.  We will iterate until we have reached
+		 * the string length or we have found the string.  (Yes, this
+		 * is done in the most naive way possible -- but considering
+		 * that the string we're searching for is likely to be
+		 * relatively short, the complexity of Rabin-Karp or similar
+		 * hardly seems merited.)
+		 */
+		char *addr = (char *)(uintptr_t)tupregs[0].dttk_value;
+		char *substr = (char *)(uintptr_t)tupregs[1].dttk_value;
+		uint64_t size = state->dts_options[DTRACEOPT_STRSIZE];
+		size_t len = dtrace_strlen(addr, size);
+		size_t sublen = dtrace_strlen(substr, size);
+		char *limit = addr + len, *orig = addr;
+		int notfound = subr == DIF_SUBR_STRSTR ? 0 : -1;
+		int inc = 1;
+
+		regs[rd] = notfound;
+
+		if (!dtrace_canload((uintptr_t)addr, len + 1, mstate, vstate)) {
+			regs[rd] = NULL;
+			break;
+		}
+
+		if (!dtrace_canload((uintptr_t)substr, sublen + 1, mstate,
+		    vstate)) {
+			regs[rd] = NULL;
+			break;
+		}
+
+		/*
+		 * strstr() and index()/rindex() have similar semantics if
+		 * both strings are the empty string: strstr() returns a
+		 * pointer to the (empty) string, and index() and rindex()
+		 * both return index 0 (regardless of any position argument).
+		 */
+		if (sublen == 0 && len == 0) {
+			if (subr == DIF_SUBR_STRSTR)
+				regs[rd] = (uintptr_t)addr;
+			else
+				regs[rd] = 0;
+			break;
+		}
+
+		if (subr != DIF_SUBR_STRSTR) {
+			if (subr == DIF_SUBR_RINDEX) {
+				limit = orig - 1;
+				addr += len;
+				inc = -1;
+			}
+
+			/*
+			 * Both index() and rindex() take an optional position
+			 * argument that denotes the starting position.
+			 */
+			if (nargs == 3) {
+				int64_t pos = (int64_t)tupregs[2].dttk_value;
+
+				/*
+				 * If the position argument to index() is
+				 * negative, Perl implicitly clamps it at
+				 * zero.  This semantic is a little surprising
+				 * given the special meaning of negative
+				 * positions to similar Perl functions like
+				 * substr(), but it appears to reflect a
+				 * notion that index() can start from a
+				 * negative index and increment its way up to
+				 * the string.  Given this notion, Perl's
+				 * rindex() is at least self-consistent in
+				 * that it implicitly clamps positions greater
+				 * than the string length to be the string
+				 * length.  Where Perl completely loses
+				 * coherence, however, is when the specified
+				 * substring is the empty string ("").  In
+				 * this case, even if the position is
+				 * negative, rindex() returns 0 -- and even if
+				 * the position is greater than the length,
+				 * index() returns the string length.  These
+				 * semantics violate the notion that index()
+				 * should never return a value less than the
+				 * specified position and that rindex() should
+				 * never return a value greater than the
+				 * specified position.  (One assumes that
+				 * these semantics are artifacts of Perl's
+				 * implementation and not the results of
+				 * deliberate design -- it beggars belief that
+				 * even Larry Wall could desire such oddness.)
+				 * While in the abstract one would wish for
+				 * consistent position semantics across
+				 * substr(), index() and rindex() -- or at the
+				 * very least self-consistent position
+				 * semantics for index() and rindex() -- we
+				 * instead opt to keep with the extant Perl
+				 * semantics, in all their broken glory.  (Do
+				 * we have more desire to maintain Perl's
+				 * semantics than Perl does?  Probably.)
+				 */
+				if (subr == DIF_SUBR_RINDEX) {
+					if (pos < 0) {
+						if (sublen == 0)
+							regs[rd] = 0;
+						break;
+					}
+
+					if (pos > len)
+						pos = len;
+				} else {
+					if (pos < 0)
+						pos = 0;
+
+					if (pos >= len) {
+						if (sublen == 0)
+							regs[rd] = len;
+						break;
+					}
+				}
+
+				addr = orig + pos;
+			}
+		}
+
+		for (regs[rd] = notfound; addr != limit; addr += inc) {
+			if (dtrace_strncmp(addr, substr, sublen) == 0) {
+				if (subr != DIF_SUBR_STRSTR) {
+					/*
+					 * As D index() and rindex() are
+					 * modeled on Perl (and not on awk),
+					 * we return a zero-based (and not a
+					 * one-based) index.  (For you Perl
+					 * weenies: no, we're not going to add
+					 * $[ -- and shouldn't you be at a con
+					 * or something?)
+					 */
+					regs[rd] = (uintptr_t)(addr - orig);
+					break;
+				}
+
+				ASSERT(subr == DIF_SUBR_STRSTR);
+				regs[rd] = (uintptr_t)addr;
+				break;
+			}
+		}
+
+		break;
+	}
+
+	case DIF_SUBR_STRTOK: {
+		uintptr_t addr = tupregs[0].dttk_value;
+		uintptr_t tokaddr = tupregs[1].dttk_value;
+		uint64_t size = state->dts_options[DTRACEOPT_STRSIZE];
+		uintptr_t limit, toklimit = tokaddr + size;
+		uint8_t c, tokmap[32];	 /* 256 / 8 */
+		char *dest = (char *)mstate->dtms_scratch_ptr;
+		int i;
+
+		/*
+		 * Check both the token buffer and (later) the input buffer,
+		 * since both could be non-scratch addresses.
+		 */
+		if (!dtrace_strcanload(tokaddr, size, mstate, vstate)) {
+			regs[rd] = NULL;
+			break;
+		}
+
+		if (!DTRACE_INSCRATCH(mstate, size)) {
+			DTRACE_CPUFLAG_SET(CPU_DTRACE_NOSCRATCH);
+			regs[rd] = NULL;
+			break;
+		}
+
+		if (addr == NULL) {
+			/*
+			 * If the address specified is NULL, we use our saved
+			 * strtok pointer from the mstate.  Note that this
+			 * means that the saved strtok pointer is _only_
+			 * valid within multiple enablings of the same probe --
+			 * it behaves like an implicit clause-local variable.
+			 */
+			addr = mstate->dtms_strtok;
+		} else {
+			/*
+			 * If the user-specified address is non-NULL we must
+			 * access check it.  This is the only time we have
+			 * a chance to do so, since this address may reside
+			 * in the string table of this clause-- future calls
+			 * (when we fetch addr from mstate->dtms_strtok)
+			 * would fail this access check.
+			 */
+			if (!dtrace_strcanload(addr, size, mstate, vstate)) {
+				regs[rd] = NULL;
+				break;
+			}
+		}
+
+		/*
+		 * First, zero the token map, and then process the token
+		 * string -- setting a bit in the map for every character
+		 * found in the token string.
+		 */
+		for (i = 0; i < sizeof (tokmap); i++)
+			tokmap[i] = 0;
+
+		for (; tokaddr < toklimit; tokaddr++) {
+			if ((c = dtrace_load8(tokaddr)) == '\0')
+				break;
+
+			ASSERT((c >> 3) < sizeof (tokmap));
+			tokmap[c >> 3] |= (1 << (c & 0x7));
+		}
+
+		for (limit = addr + size; addr < limit; addr++) {
+			/*
+			 * We're looking for a character that is _not_ contained
+			 * in the token string.
+			 */
+			if ((c = dtrace_load8(addr)) == '\0')
+				break;
+
+			if (!(tokmap[c >> 3] & (1 << (c & 0x7))))
+				break;
+		}
+
+		if (c == '\0') {
+			/*
+			 * We reached the end of the string without finding
+			 * any character that was not in the token string.
+			 * We return NULL in this case, and we set the saved
+			 * address to NULL as well.
+			 */
+			regs[rd] = NULL;
+			mstate->dtms_strtok = NULL;
+			break;
+		}
+
+		/*
+		 * From here on, we're copying into the destination string.
+		 */
+		for (i = 0; addr < limit && i < size - 1; addr++) {
+			if ((c = dtrace_load8(addr)) == '\0')
+				break;
+
+			if (tokmap[c >> 3] & (1 << (c & 0x7)))
+				break;
+
+			ASSERT(i < size);
+			dest[i++] = c;
+		}
+
+		ASSERT(i < size);
+		dest[i] = '\0';
+		regs[rd] = (uintptr_t)dest;
+		mstate->dtms_scratch_ptr += size;
+		mstate->dtms_strtok = addr;
+		break;
+	}
+
+	case DIF_SUBR_SUBSTR: {
+		uintptr_t s = tupregs[0].dttk_value;
+		uint64_t size = state->dts_options[DTRACEOPT_STRSIZE];
+		char *d = (char *)mstate->dtms_scratch_ptr;
+		int64_t index = (int64_t)tupregs[1].dttk_value;
+		int64_t remaining = (int64_t)tupregs[2].dttk_value;
+		size_t len = dtrace_strlen((char *)s, size);
+		int64_t i = 0;
+
+		if (!dtrace_canload(s, len + 1, mstate, vstate)) {
+			regs[rd] = NULL;
+			break;
+		}
+
+		if (nargs <= 2)
+			remaining = (int64_t)size;
+
+		if (!DTRACE_INSCRATCH(mstate, size)) {
+			DTRACE_CPUFLAG_SET(CPU_DTRACE_NOSCRATCH);
+			regs[rd] = NULL;
+			break;
+		}
+
+		if (index < 0) {
+			index += len;
+
+			if (index < 0 && index + remaining > 0) {
+				remaining += index;
+				index = 0;
+			}
+		}
+
+		if (index >= len || index < 0)
+			index = len;
+
+		for (d[0] = '\0'; remaining > 0; remaining--) {
+			if ((d[i++] = dtrace_load8(s++ + index)) == '\0')
+				break;
+
+			if (i == size) {
+				d[i - 1] = '\0';
+				break;
+			}
+		}
+
+		mstate->dtms_scratch_ptr += size;
+		regs[rd] = (uintptr_t)d;
+		break;
+	}
+
+	case DIF_SUBR_GETMAJOR:
+#ifdef _LP64
+		regs[rd] = (tupregs[0].dttk_value >> NBITSMINOR64) & MAXMAJ64;
+#else
+		regs[rd] = (tupregs[0].dttk_value >> NBITSMINOR) & MAXMAJ;
+#endif
+		break;
+
+	case DIF_SUBR_GETMINOR:
+#ifdef _LP64
+		regs[rd] = tupregs[0].dttk_value & MAXMIN64;
+#else
+		regs[rd] = tupregs[0].dttk_value & MAXMIN;
+#endif
+		break;
+
+	case DIF_SUBR_DDI_PATHNAME: {
+		/*
+		 * This one is a galactic mess.  We are going to roughly
+		 * emulate ddi_pathname(), but it's made more complicated
+		 * by the fact that we (a) want to include the minor name and
+		 * (b) must proceed iteratively instead of recursively.
+		 */
+		uintptr_t dest = mstate->dtms_scratch_ptr;
+		uint64_t size = state->dts_options[DTRACEOPT_STRSIZE];
+		char *start = (char *)dest, *end = start + size - 1;
+		uintptr_t daddr = tupregs[0].dttk_value;
+		int64_t minor = (int64_t)tupregs[1].dttk_value;
+		char *s;
+		int i, len, depth = 0;
+
+		/*
+		 * Due to all the pointer jumping we do and context we must
+		 * rely upon, we just mandate that the user must have kernel
+		 * read privileges to use this routine.
+		 */
+		if ((mstate->dtms_access & DTRACE_ACCESS_KERNEL) == 0) {
+			*flags |= CPU_DTRACE_KPRIV;
+			*illval = daddr;
+			regs[rd] = NULL;
+		}
+
+		if (!DTRACE_INSCRATCH(mstate, size)) {
+			DTRACE_CPUFLAG_SET(CPU_DTRACE_NOSCRATCH);
+			regs[rd] = NULL;
+			break;
+		}
+
+		*end = '\0';
+
+		/*
+		 * We want to have a name for the minor.  In order to do this,
+		 * we need to walk the minor list from the devinfo.  We want
+		 * to be sure that we don't infinitely walk a circular list,
+		 * so we check for circularity by sending a scout pointer
+		 * ahead two elements for every element that we iterate over;
+		 * if the list is circular, these will ultimately point to the
+		 * same element.  You may recognize this little trick as the
+		 * answer to a stupid interview question -- one that always
+		 * seems to be asked by those who had to have it laboriously
+		 * explained to them, and who can't even concisely describe
+		 * the conditions under which one would be forced to resort to
+		 * this technique.  Needless to say, those conditions are
+		 * found here -- and probably only here.  Is this is the only
+		 * use of this infamous trick in shipping, production code?
+		 * If it isn't, it probably should be...
+		 */
+		if (minor != -1) {
+			uintptr_t maddr = dtrace_loadptr(daddr +
+			    offsetof(struct dev_info, devi_minor));
+
+			uintptr_t next = offsetof(struct ddi_minor_data, next);
+			uintptr_t name = offsetof(struct ddi_minor_data,
+			    d_minor) + offsetof(struct ddi_minor, name);
+			uintptr_t dev = offsetof(struct ddi_minor_data,
+			    d_minor) + offsetof(struct ddi_minor, dev);
+			uintptr_t scout;
+
+			if (maddr != NULL)
+				scout = dtrace_loadptr(maddr + next);
+
+			while (maddr != NULL && !(*flags & CPU_DTRACE_FAULT)) {
+				uint64_t m;
+#ifdef _LP64
+				m = dtrace_load64(maddr + dev) & MAXMIN64;
+#else
+				m = dtrace_load32(maddr + dev) & MAXMIN;
+#endif
+				if (m != minor) {
+					maddr = dtrace_loadptr(maddr + next);
+
+					if (scout == NULL)
+						continue;
+
+					scout = dtrace_loadptr(scout + next);
+
+					if (scout == NULL)
+						continue;
+
+					scout = dtrace_loadptr(scout + next);
+
+					if (scout == NULL)
+						continue;
+
+					if (scout == maddr) {
+						*flags |= CPU_DTRACE_ILLOP;
+						break;
+					}
+
+					continue;
+				}
+
+				/*
+				 * We have the minor data.  Now we need to
+				 * copy the minor's name into the end of the
+				 * pathname.
+				 */
+				s = (char *)dtrace_loadptr(maddr + name);
+				len = dtrace_strlen(s, size);
+
+				if (*flags & CPU_DTRACE_FAULT)
+					break;
+
+				if (len != 0) {
+					if ((end -= (len + 1)) < start)
+						break;
+
+					*end = ':';
+				}
+
+				for (i = 1; i <= len; i++)
+					end[i] = dtrace_load8((uintptr_t)s++);
+				break;
+			}
+		}
+
+		while (daddr != NULL && !(*flags & CPU_DTRACE_FAULT)) {
+			ddi_node_state_t devi_state;
+
+			devi_state = dtrace_load32(daddr +
+			    offsetof(struct dev_info, devi_node_state));
+
+			if (*flags & CPU_DTRACE_FAULT)
+				break;
+
+			if (devi_state >= DS_INITIALIZED) {
+				s = (char *)dtrace_loadptr(daddr +
+				    offsetof(struct dev_info, devi_addr));
+				len = dtrace_strlen(s, size);
+
+				if (*flags & CPU_DTRACE_FAULT)
+					break;
+
+				if (len != 0) {
+					if ((end -= (len + 1)) < start)
+						break;
+
+					*end = '@';
+				}
+
+				for (i = 1; i <= len; i++)
+					end[i] = dtrace_load8((uintptr_t)s++);
+			}
+
+			/*
+			 * Now for the node name...
+			 */
+			s = (char *)dtrace_loadptr(daddr +
+			    offsetof(struct dev_info, devi_node_name));
+
+			daddr = dtrace_loadptr(daddr +
+			    offsetof(struct dev_info, devi_parent));
+
+			/*
+			 * If our parent is NULL (that is, if we're the root
+			 * node), we're going to use the special path
+			 * "devices".
+			 */
+			if (daddr == NULL)
+				s = "devices";
+
+			len = dtrace_strlen(s, size);
+			if (*flags & CPU_DTRACE_FAULT)
+				break;
+
+			if ((end -= (len + 1)) < start)
+				break;
+
+			for (i = 1; i <= len; i++)
+				end[i] = dtrace_load8((uintptr_t)s++);
+			*end = '/';
+
+			if (depth++ > dtrace_devdepth_max) {
+				*flags |= CPU_DTRACE_ILLOP;
+				break;
+			}
+		}
+
+		if (end < start)
+			DTRACE_CPUFLAG_SET(CPU_DTRACE_NOSCRATCH);
+
+		if (daddr == NULL) {
+			regs[rd] = (uintptr_t)end;
+			mstate->dtms_scratch_ptr += size;
+		}
+
+		break;
+	}
+
+	case DIF_SUBR_STRJOIN: {
+		char *d = (char *)mstate->dtms_scratch_ptr;
+		uint64_t size = state->dts_options[DTRACEOPT_STRSIZE];
+		uintptr_t s1 = tupregs[0].dttk_value;
+		uintptr_t s2 = tupregs[1].dttk_value;
+		int i = 0;
+
+		if (!dtrace_strcanload(s1, size, mstate, vstate) ||
+		    !dtrace_strcanload(s2, size, mstate, vstate)) {
+			regs[rd] = NULL;
+			break;
+		}
+
+		if (!DTRACE_INSCRATCH(mstate, size)) {
+			DTRACE_CPUFLAG_SET(CPU_DTRACE_NOSCRATCH);
+			regs[rd] = NULL;
+			break;
+		}
+
+		for (;;) {
+			if (i >= size) {
+				DTRACE_CPUFLAG_SET(CPU_DTRACE_NOSCRATCH);
+				regs[rd] = NULL;
+				break;
+			}
+
+			if ((d[i++] = dtrace_load8(s1++)) == '\0') {
+				i--;
+				break;
+			}
+		}
+
+		for (;;) {
+			if (i >= size) {
+				DTRACE_CPUFLAG_SET(CPU_DTRACE_NOSCRATCH);
+				regs[rd] = NULL;
+				break;
+			}
+
+			if ((d[i++] = dtrace_load8(s2++)) == '\0')
+				break;
+		}
+
+		if (i < size) {
+			mstate->dtms_scratch_ptr += i;
+			regs[rd] = (uintptr_t)d;
+		}
+
+		break;
+	}
+
+	case DIF_SUBR_LLTOSTR: {
+		int64_t i = (int64_t)tupregs[0].dttk_value;
+		int64_t val = i < 0 ? i * -1 : i;
+		uint64_t size = 22;	/* enough room for 2^64 in decimal */
+		char *end = (char *)mstate->dtms_scratch_ptr + size - 1;
+
+		if (!DTRACE_INSCRATCH(mstate, size)) {
+			DTRACE_CPUFLAG_SET(CPU_DTRACE_NOSCRATCH);
+			regs[rd] = NULL;
+			break;
+		}
+
+		for (*end-- = '\0'; val; val /= 10)
+			*end-- = '0' + (val % 10);
+
+		if (i == 0)
+			*end-- = '0';
+
+		if (i < 0)
+			*end-- = '-';
+
+		regs[rd] = (uintptr_t)end + 1;
+		mstate->dtms_scratch_ptr += size;
+		break;
+	}
+
+	case DIF_SUBR_HTONS:
+	case DIF_SUBR_NTOHS:
+#ifdef _BIG_ENDIAN
+		regs[rd] = (uint16_t)tupregs[0].dttk_value;
+#else
+		regs[rd] = DT_BSWAP_16((uint16_t)tupregs[0].dttk_value);
+#endif
+		break;
+
+
+	case DIF_SUBR_HTONL:
+	case DIF_SUBR_NTOHL:
+#ifdef _BIG_ENDIAN
+		regs[rd] = (uint32_t)tupregs[0].dttk_value;
+#else
+		regs[rd] = DT_BSWAP_32((uint32_t)tupregs[0].dttk_value);
+#endif
+		break;
+
+
+	case DIF_SUBR_HTONLL:
+	case DIF_SUBR_NTOHLL:
+#ifdef _BIG_ENDIAN
+		regs[rd] = (uint64_t)tupregs[0].dttk_value;
+#else
+		regs[rd] = DT_BSWAP_64((uint64_t)tupregs[0].dttk_value);
+#endif
+		break;
+
+
+	case DIF_SUBR_DIRNAME:
+	case DIF_SUBR_BASENAME: {
+		char *dest = (char *)mstate->dtms_scratch_ptr;
+		uint64_t size = state->dts_options[DTRACEOPT_STRSIZE];
+		uintptr_t src = tupregs[0].dttk_value;
+		int i, j, len = dtrace_strlen((char *)src, size);
+		int lastbase = -1, firstbase = -1, lastdir = -1;
+		int start, end;
+
+		if (!dtrace_canload(src, len + 1, mstate, vstate)) {
+			regs[rd] = NULL;
+			break;
+		}
+
+		if (!DTRACE_INSCRATCH(mstate, size)) {
+			DTRACE_CPUFLAG_SET(CPU_DTRACE_NOSCRATCH);
+			regs[rd] = NULL;
+			break;
+		}
+
+		/*
+		 * The basename and dirname for a zero-length string is
+		 * defined to be "."
+		 */
+		if (len == 0) {
+			len = 1;
+			src = (uintptr_t)".";
+		}
+
+		/*
+		 * Start from the back of the string, moving back toward the
+		 * front until we see a character that isn't a slash.  That
+		 * character is the last character in the basename.
+		 */
+		for (i = len - 1; i >= 0; i--) {
+			if (dtrace_load8(src + i) != '/')
+				break;
+		}
+
+		if (i >= 0)
+			lastbase = i;
+
+		/*
+		 * Starting from the last character in the basename, move
+		 * towards the front until we find a slash.  The character
+		 * that we processed immediately before that is the first
+		 * character in the basename.
+		 */
+		for (; i >= 0; i--) {
+			if (dtrace_load8(src + i) == '/')
+				break;
+		}
+
+		if (i >= 0)
+			firstbase = i + 1;
+
+		/*
+		 * Now keep going until we find a non-slash character.  That
+		 * character is the last character in the dirname.
+		 */
+		for (; i >= 0; i--) {
+			if (dtrace_load8(src + i) != '/')
+				break;
+		}
+
+		if (i >= 0)
+			lastdir = i;
+
+		ASSERT(!(lastbase == -1 && firstbase != -1));
+		ASSERT(!(firstbase == -1 && lastdir != -1));
+
+		if (lastbase == -1) {
+			/*
+			 * We didn't find a non-slash character.  We know that
+			 * the length is non-zero, so the whole string must be
+			 * slashes.  In either the dirname or the basename
+			 * case, we return '/'.
+			 */
+			ASSERT(firstbase == -1);
+			firstbase = lastbase = lastdir = 0;
+		}
+
+		if (firstbase == -1) {
+			/*
+			 * The entire string consists only of a basename
+			 * component.  If we're looking for dirname, we need
+			 * to change our string to be just "."; if we're
+			 * looking for a basename, we'll just set the first
+			 * character of the basename to be 0.
+			 */
+			if (subr == DIF_SUBR_DIRNAME) {
+				ASSERT(lastdir == -1);
+				src = (uintptr_t)".";
+				lastdir = 0;
+			} else {
+				firstbase = 0;
+			}
+		}
+
+		if (subr == DIF_SUBR_DIRNAME) {
+			if (lastdir == -1) {
+				/*
+				 * We know that we have a slash in the name --
+				 * or lastdir would be set to 0, above.  And
+				 * because lastdir is -1, we know that this
+				 * slash must be the first character.  (That
+				 * is, the full string must be of the form
+				 * "/basename".)  In this case, the last
+				 * character of the directory name is 0.
+				 */
+				lastdir = 0;
+			}
+
+			start = 0;
+			end = lastdir;
+		} else {
+			ASSERT(subr == DIF_SUBR_BASENAME);
+			ASSERT(firstbase != -1 && lastbase != -1);
+			start = firstbase;
+			end = lastbase;
+		}
+
+		for (i = start, j = 0; i <= end && j < size - 1; i++, j++)
+			dest[j] = dtrace_load8(src + i);
+
+		dest[j] = '\0';
+		regs[rd] = (uintptr_t)dest;
+		mstate->dtms_scratch_ptr += size;
+		break;
+	}
+
+	case DIF_SUBR_CLEANPATH: {
+		char *dest = (char *)mstate->dtms_scratch_ptr, c;
+		uint64_t size = state->dts_options[DTRACEOPT_STRSIZE];
+		uintptr_t src = tupregs[0].dttk_value;
+		int i = 0, j = 0;
+
+		if (!dtrace_strcanload(src, size, mstate, vstate)) {
+			regs[rd] = NULL;
+			break;
+		}
+
+		if (!DTRACE_INSCRATCH(mstate, size)) {
+			DTRACE_CPUFLAG_SET(CPU_DTRACE_NOSCRATCH);
+			regs[rd] = NULL;
+			break;
+		}
+
+		/*
+		 * Move forward, loading each character.
+		 */
+		do {
+			c = dtrace_load8(src + i++);
+next:
+			if (j + 5 >= size)	/* 5 = strlen("/..c\0") */
+				break;
+
+			if (c != '/') {
+				dest[j++] = c;
+				continue;
+			}
+
+			c = dtrace_load8(src + i++);
+
+			if (c == '/') {
+				/*
+				 * We have two slashes -- we can just advance
+				 * to the next character.
+				 */
+				goto next;
+			}
+
+			if (c != '.') {
+				/*
+				 * This is not "." and it's not ".." -- we can
+				 * just store the "/" and this character and
+				 * drive on.
+				 */
+				dest[j++] = '/';
+				dest[j++] = c;
+				continue;
+			}
+
+			c = dtrace_load8(src + i++);
+
+			if (c == '/') {
+				/*
+				 * This is a "/./" component.  We're not going
+				 * to store anything in the destination buffer;
+				 * we're just going to go to the next component.
+				 */
+				goto next;
+			}
+
+			if (c != '.') {
+				/*
+				 * This is not ".." -- we can just store the
+				 * "/." and this character and continue
+				 * processing.
+				 */
+				dest[j++] = '/';
+				dest[j++] = '.';
+				dest[j++] = c;
+				continue;
+			}
+
+			c = dtrace_load8(src + i++);
+
+			if (c != '/' && c != '\0') {
+				/*
+				 * This is not ".." -- it's "..[mumble]".
+				 * We'll store the "/.." and this character
+				 * and continue processing.
+				 */
+				dest[j++] = '/';
+				dest[j++] = '.';
+				dest[j++] = '.';
+				dest[j++] = c;
+				continue;
+			}
+
+			/*
+			 * This is "/../" or "/..\0".  We need to back up
+			 * our destination pointer until we find a "/".
+			 */
+			i--;
+			while (j != 0 && dest[--j] != '/')
+				continue;
+
+			if (c == '\0')
+				dest[++j] = '/';
+		} while (c != '\0');
+
+		dest[j] = '\0';
+		regs[rd] = (uintptr_t)dest;
+		mstate->dtms_scratch_ptr += size;
+		break;
+	}
+
+	case DIF_SUBR_INET_NTOA:
+	case DIF_SUBR_INET_NTOA6:
+	case DIF_SUBR_INET_NTOP: {
+		size_t size;
+		int af, argi, i;
+		char *base, *end;
+
+		if (subr == DIF_SUBR_INET_NTOP) {
+			af = (int)tupregs[0].dttk_value;
+			argi = 1;
+		} else {
+			af = subr == DIF_SUBR_INET_NTOA ? AF_INET: AF_INET6;
+			argi = 0;
+		}
+
+		if (af == AF_INET) {
+			ipaddr_t ip4;
+			uint8_t *ptr8, val;
+
+			/*
+			 * Safely load the IPv4 address.
+			 */
+			ip4 = dtrace_load32(tupregs[argi].dttk_value);
+
+			/*
+			 * Check an IPv4 string will fit in scratch.
+			 */
+			size = INET_ADDRSTRLEN;
+			if (!DTRACE_INSCRATCH(mstate, size)) {
+				DTRACE_CPUFLAG_SET(CPU_DTRACE_NOSCRATCH);
+				regs[rd] = NULL;
+				break;
+			}
+			base = (char *)mstate->dtms_scratch_ptr;
+			end = (char *)mstate->dtms_scratch_ptr + size - 1;
+
+			/*
+			 * Stringify as a dotted decimal quad.
+			 */
+			*end-- = '\0';
+			ptr8 = (uint8_t *)&ip4;
+			for (i = 3; i >= 0; i--) {
+				val = ptr8[i];
+
+				if (val == 0) {
+					*end-- = '0';
+				} else {
+					for (; val; val /= 10) {
+						*end-- = '0' + (val % 10);
+					}
+				}
+
+				if (i > 0)
+					*end-- = '.';
+			}
+			ASSERT(end + 1 >= base);
+
+		} else if (af == AF_INET6) {
+			struct in6_addr ip6;
+			int firstzero, tryzero, numzero, v6end;
+			uint16_t val;
+			const char digits[] = "0123456789abcdef";
+
+			/*
+			 * Stringify using RFC 1884 convention 2 - 16 bit
+			 * hexadecimal values with a zero-run compression.
+			 * Lower case hexadecimal digits are used.
+			 * 	eg, fe80::214:4fff:fe0b:76c8.
+			 * The IPv4 embedded form is returned for inet_ntop,
+			 * just the IPv4 string is returned for inet_ntoa6.
+			 */
+
+			/*
+			 * Safely load the IPv6 address.
+			 */
+			dtrace_bcopy(
+			    (void *)(uintptr_t)tupregs[argi].dttk_value,
+			    (void *)(uintptr_t)&ip6, sizeof (struct in6_addr));
+
+			/*
+			 * Check an IPv6 string will fit in scratch.
+			 */
+			size = INET6_ADDRSTRLEN;
+			if (!DTRACE_INSCRATCH(mstate, size)) {
+				DTRACE_CPUFLAG_SET(CPU_DTRACE_NOSCRATCH);
+				regs[rd] = NULL;
+				break;
+			}
+			base = (char *)mstate->dtms_scratch_ptr;
+			end = (char *)mstate->dtms_scratch_ptr + size - 1;
+			*end-- = '\0';
+
+			/*
+			 * Find the longest run of 16 bit zero values
+			 * for the single allowed zero compression - "::".
+			 */
+			firstzero = -1;
+			tryzero = -1;
+			numzero = 1;
+			for (i = 0; i < sizeof (struct in6_addr); i++) {
+				if (ip6._S6_un._S6_u8[i] == 0 &&
+				    tryzero == -1 && i % 2 == 0) {
+					tryzero = i;
+					continue;
+				}
+
+				if (tryzero != -1 &&
+				    (ip6._S6_un._S6_u8[i] != 0 ||
+				    i == sizeof (struct in6_addr) - 1)) {
+
+					if (i - tryzero <= numzero) {
+						tryzero = -1;
+						continue;
+					}
+
+					firstzero = tryzero;
+					numzero = i - i % 2 - tryzero;
+					tryzero = -1;
+
+					if (ip6._S6_un._S6_u8[i] == 0 &&
+					    i == sizeof (struct in6_addr) - 1)
+						numzero += 2;
+				}
+			}
+			ASSERT(firstzero + numzero <= sizeof (struct in6_addr));
+
+			/*
+			 * Check for an IPv4 embedded address.
+			 */
+			v6end = sizeof (struct in6_addr) - 2;
+			if (IN6_IS_ADDR_V4MAPPED(&ip6) ||
+			    IN6_IS_ADDR_V4COMPAT(&ip6)) {
+				for (i = sizeof (struct in6_addr) - 1;
+				    i >= DTRACE_V4MAPPED_OFFSET; i--) {
+					ASSERT(end >= base);
+
+					val = ip6._S6_un._S6_u8[i];
+
+					if (val == 0) {
+						*end-- = '0';
+					} else {
+						for (; val; val /= 10) {
+							*end-- = '0' + val % 10;
+						}
+					}
+
+					if (i > DTRACE_V4MAPPED_OFFSET)
+						*end-- = '.';
+				}
+
+				if (subr == DIF_SUBR_INET_NTOA6)
+					goto inetout;
+
+				/*
+				 * Set v6end to skip the IPv4 address that
+				 * we have already stringified.
+				 */
+				v6end = 10;
+			}
+
+			/*
+			 * Build the IPv6 string by working through the
+			 * address in reverse.
+			 */
+			for (i = v6end; i >= 0; i -= 2) {
+				ASSERT(end >= base);
+
+				if (i == firstzero + numzero - 2) {
+					*end-- = ':';
+					*end-- = ':';
+					i -= numzero - 2;
+					continue;
+				}
+
+				if (i < 14 && i != firstzero - 2)
+					*end-- = ':';
+
+				val = (ip6._S6_un._S6_u8[i] << 8) +
+				    ip6._S6_un._S6_u8[i + 1];
+
+				if (val == 0) {
+					*end-- = '0';
+				} else {
+					for (; val; val /= 16) {
+						*end-- = digits[val % 16];
+					}
+				}
+			}
+			ASSERT(end + 1 >= base);
+
+		} else {
+			/*
+			 * The user didn't use AH_INET or AH_INET6.
+			 */
+			DTRACE_CPUFLAG_SET(CPU_DTRACE_ILLOP);
+			regs[rd] = NULL;
+			break;
+		}
+
+inetout:	regs[rd] = (uintptr_t)end + 1;
+		mstate->dtms_scratch_ptr += size;
+		break;
+	}
+
+	}
+}
+
+/*
+ * Emulate the execution of DTrace IR instructions specified by the given
+ * DIF object.  This function is deliberately void of assertions as all of
+ * the necessary checks are handled by a call to dtrace_difo_validate().
+ */
+static uint64_t
+dtrace_dif_emulate(dtrace_difo_t *difo, dtrace_mstate_t *mstate,
+    dtrace_vstate_t *vstate, dtrace_state_t *state)
+{
+	const dif_instr_t *text = difo->dtdo_buf;
+	const uint_t textlen = difo->dtdo_len;
+	const char *strtab = difo->dtdo_strtab;
+	const uint64_t *inttab = difo->dtdo_inttab;
+
+	uint64_t rval = 0;
+	dtrace_statvar_t *svar;
+	dtrace_dstate_t *dstate = &vstate->dtvs_dynvars;
+	dtrace_difv_t *v;
+	volatile uint16_t *flags = &cpu_core[CPU->cpu_id].cpuc_dtrace_flags;
+	volatile uintptr_t *illval = &cpu_core[CPU->cpu_id].cpuc_dtrace_illval;
+
+	dtrace_key_t tupregs[DIF_DTR_NREGS + 2]; /* +2 for thread and id */
+	uint64_t regs[DIF_DIR_NREGS];
+	uint64_t *tmp;
+
+	uint8_t cc_n = 0, cc_z = 0, cc_v = 0, cc_c = 0;
+	int64_t cc_r;
+	uint_t pc = 0, id, opc;
+	uint8_t ttop = 0;
+	dif_instr_t instr;
+	uint_t r1, r2, rd;
+
+	/*
+	 * We stash the current DIF object into the machine state: we need it
+	 * for subsequent access checking.
+	 */
+	mstate->dtms_difo = difo;
+
+	regs[DIF_REG_R0] = 0; 		/* %r0 is fixed at zero */
+
+	while (pc < textlen && !(*flags & CPU_DTRACE_FAULT)) {
+		opc = pc;
+
+		instr = text[pc++];
+		r1 = DIF_INSTR_R1(instr);
+		r2 = DIF_INSTR_R2(instr);
+		rd = DIF_INSTR_RD(instr);
+
+		switch (DIF_INSTR_OP(instr)) {
+		case DIF_OP_OR:
+			regs[rd] = regs[r1] | regs[r2];
+			break;
+		case DIF_OP_XOR:
+			regs[rd] = regs[r1] ^ regs[r2];
+			break;
+		case DIF_OP_AND:
+			regs[rd] = regs[r1] & regs[r2];
+			break;
+		case DIF_OP_SLL:
+			regs[rd] = regs[r1] << regs[r2];
+			break;
+		case DIF_OP_SRL:
+			regs[rd] = regs[r1] >> regs[r2];
+			break;
+		case DIF_OP_SUB:
+			regs[rd] = regs[r1] - regs[r2];
+			break;
+		case DIF_OP_ADD:
+			regs[rd] = regs[r1] + regs[r2];
+			break;
+		case DIF_OP_MUL:
+			regs[rd] = regs[r1] * regs[r2];
+			break;
+		case DIF_OP_SDIV:
+			if (regs[r2] == 0) {
+				regs[rd] = 0;
+				*flags |= CPU_DTRACE_DIVZERO;
+			} else {
+				regs[rd] = (int64_t)regs[r1] /
+				    (int64_t)regs[r2];
+			}
+			break;
+
+		case DIF_OP_UDIV:
+			if (regs[r2] == 0) {
+				regs[rd] = 0;
+				*flags |= CPU_DTRACE_DIVZERO;
+			} else {
+				regs[rd] = regs[r1] / regs[r2];
+			}
+			break;
+
+		case DIF_OP_SREM:
+			if (regs[r2] == 0) {
+				regs[rd] = 0;
+				*flags |= CPU_DTRACE_DIVZERO;
+			} else {
+				regs[rd] = (int64_t)regs[r1] %
+				    (int64_t)regs[r2];
+			}
+			break;
+
+		case DIF_OP_UREM:
+			if (regs[r2] == 0) {
+				regs[rd] = 0;
+				*flags |= CPU_DTRACE_DIVZERO;
+			} else {
+				regs[rd] = regs[r1] % regs[r2];
+			}
+			break;
+
+		case DIF_OP_NOT:
+			regs[rd] = ~regs[r1];
+			break;
+		case DIF_OP_MOV:
+			regs[rd] = regs[r1];
+			break;
+		case DIF_OP_CMP:
+			cc_r = regs[r1] - regs[r2];
+			cc_n = cc_r < 0;
+			cc_z = cc_r == 0;
+			cc_v = 0;
+			cc_c = regs[r1] < regs[r2];
+			break;
+		case DIF_OP_TST:
+			cc_n = cc_v = cc_c = 0;
+			cc_z = regs[r1] == 0;
+			break;
+		case DIF_OP_BA:
+			pc = DIF_INSTR_LABEL(instr);
+			break;
+		case DIF_OP_BE:
+			if (cc_z)
+				pc = DIF_INSTR_LABEL(instr);
+			break;
+		case DIF_OP_BNE:
+			if (cc_z == 0)
+				pc = DIF_INSTR_LABEL(instr);
+			break;
+		case DIF_OP_BG:
+			if ((cc_z | (cc_n ^ cc_v)) == 0)
+				pc = DIF_INSTR_LABEL(instr);
+			break;
+		case DIF_OP_BGU:
+			if ((cc_c | cc_z) == 0)
+				pc = DIF_INSTR_LABEL(instr);
+			break;
+		case DIF_OP_BGE:
+			if ((cc_n ^ cc_v) == 0)
+				pc = DIF_INSTR_LABEL(instr);
+			break;
+		case DIF_OP_BGEU:
+			if (cc_c == 0)
+				pc = DIF_INSTR_LABEL(instr);
+			break;
+		case DIF_OP_BL:
+			if (cc_n ^ cc_v)
+				pc = DIF_INSTR_LABEL(instr);
+			break;
+		case DIF_OP_BLU:
+			if (cc_c)
+				pc = DIF_INSTR_LABEL(instr);
+			break;
+		case DIF_OP_BLE:
+			if (cc_z | (cc_n ^ cc_v))
+				pc = DIF_INSTR_LABEL(instr);
+			break;
+		case DIF_OP_BLEU:
+			if (cc_c | cc_z)
+				pc = DIF_INSTR_LABEL(instr);
+			break;
+		case DIF_OP_RLDSB:
+			if (!dtrace_canstore(regs[r1], 1, mstate, vstate)) {
+				*flags |= CPU_DTRACE_KPRIV;
+				*illval = regs[r1];
+				break;
+			}
+			/*FALLTHROUGH*/
+		case DIF_OP_LDSB:
+			regs[rd] = (int8_t)dtrace_load8(regs[r1]);
+			break;
+		case DIF_OP_RLDSH:
+			if (!dtrace_canstore(regs[r1], 2, mstate, vstate)) {
+				*flags |= CPU_DTRACE_KPRIV;
+				*illval = regs[r1];
+				break;
+			}
+			/*FALLTHROUGH*/
+		case DIF_OP_LDSH:
+			regs[rd] = (int16_t)dtrace_load16(regs[r1]);
+			break;
+		case DIF_OP_RLDSW:
+			if (!dtrace_canstore(regs[r1], 4, mstate, vstate)) {
+				*flags |= CPU_DTRACE_KPRIV;
+				*illval = regs[r1];
+				break;
+			}
+			/*FALLTHROUGH*/
+		case DIF_OP_LDSW:
+			regs[rd] = (int32_t)dtrace_load32(regs[r1]);
+			break;
+		case DIF_OP_RLDUB:
+			if (!dtrace_canstore(regs[r1], 1, mstate, vstate)) {
+				*flags |= CPU_DTRACE_KPRIV;
+				*illval = regs[r1];
+				break;
+			}
+			/*FALLTHROUGH*/
+		case DIF_OP_LDUB:
+			regs[rd] = dtrace_load8(regs[r1]);
+			break;
+		case DIF_OP_RLDUH:
+			if (!dtrace_canstore(regs[r1], 2, mstate, vstate)) {
+				*flags |= CPU_DTRACE_KPRIV;
+				*illval = regs[r1];
+				break;
+			}
+			/*FALLTHROUGH*/
+		case DIF_OP_LDUH:
+			regs[rd] = dtrace_load16(regs[r1]);
+			break;
+		case DIF_OP_RLDUW:
+			if (!dtrace_canstore(regs[r1], 4, mstate, vstate)) {
+				*flags |= CPU_DTRACE_KPRIV;
+				*illval = regs[r1];
+				break;
+			}
+			/*FALLTHROUGH*/
+		case DIF_OP_LDUW:
+			regs[rd] = dtrace_load32(regs[r1]);
+			break;
+		case DIF_OP_RLDX:
+			if (!dtrace_canstore(regs[r1], 8, mstate, vstate)) {
+				*flags |= CPU_DTRACE_KPRIV;
+				*illval = regs[r1];
+				break;
+			}
+			/*FALLTHROUGH*/
+		case DIF_OP_LDX:
+			regs[rd] = dtrace_load64(regs[r1]);
+			break;
+		case DIF_OP_ULDSB:
+			regs[rd] = (int8_t)
+			    dtrace_fuword8((void *)(uintptr_t)regs[r1]);
+			break;
+		case DIF_OP_ULDSH:
+			regs[rd] = (int16_t)
+			    dtrace_fuword16((void *)(uintptr_t)regs[r1]);
+			break;
+		case DIF_OP_ULDSW:
+			regs[rd] = (int32_t)
+			    dtrace_fuword32((void *)(uintptr_t)regs[r1]);
+			break;
+		case DIF_OP_ULDUB:
+			regs[rd] =
+			    dtrace_fuword8((void *)(uintptr_t)regs[r1]);
+			break;
+		case DIF_OP_ULDUH:
+			regs[rd] =
+			    dtrace_fuword16((void *)(uintptr_t)regs[r1]);
+			break;
+		case DIF_OP_ULDUW:
+			regs[rd] =
+			    dtrace_fuword32((void *)(uintptr_t)regs[r1]);
+			break;
+		case DIF_OP_ULDX:
+			regs[rd] =
+			    dtrace_fuword64((void *)(uintptr_t)regs[r1]);
+			break;
+		case DIF_OP_RET:
+			rval = regs[rd];
+			pc = textlen;
+			break;
+		case DIF_OP_NOP:
+			break;
+		case DIF_OP_SETX:
+			regs[rd] = inttab[DIF_INSTR_INTEGER(instr)];
+			break;
+		case DIF_OP_SETS:
+			regs[rd] = (uint64_t)(uintptr_t)
+			    (strtab + DIF_INSTR_STRING(instr));
+			break;
+		case DIF_OP_SCMP: {
+			size_t sz = state->dts_options[DTRACEOPT_STRSIZE];
+			uintptr_t s1 = regs[r1];
+			uintptr_t s2 = regs[r2];
+
+			if (s1 != NULL &&
+			    !dtrace_strcanload(s1, sz, mstate, vstate))
+				break;
+			if (s2 != NULL &&
+			    !dtrace_strcanload(s2, sz, mstate, vstate))
+				break;
+
+			cc_r = dtrace_strncmp((char *)s1, (char *)s2, sz);
+
+			cc_n = cc_r < 0;
+			cc_z = cc_r == 0;
+			cc_v = cc_c = 0;
+			break;
+		}
+		case DIF_OP_LDGA:
+			regs[rd] = dtrace_dif_variable(mstate, state,
+			    r1, regs[r2]);
+			break;
+		case DIF_OP_LDGS:
+			id = DIF_INSTR_VAR(instr);
+
+			if (id >= DIF_VAR_OTHER_UBASE) {
+				uintptr_t a;
+
+				id -= DIF_VAR_OTHER_UBASE;
+				svar = vstate->dtvs_globals[id];
+				ASSERT(svar != NULL);
+				v = &svar->dtsv_var;
+
+				if (!(v->dtdv_type.dtdt_flags & DIF_TF_BYREF)) {
+					regs[rd] = svar->dtsv_data;
+					break;
+				}
+
+				a = (uintptr_t)svar->dtsv_data;
+
+				if (*(uint8_t *)a == UINT8_MAX) {
+					/*
+					 * If the 0th byte is set to UINT8_MAX
+					 * then this is to be treated as a
+					 * reference to a NULL variable.
+					 */
+					regs[rd] = NULL;
+				} else {
+					regs[rd] = a + sizeof (uint64_t);
+				}
+
+				break;
+			}
+
+			regs[rd] = dtrace_dif_variable(mstate, state, id, 0);
+			break;
+
+		case DIF_OP_STGS:
+			id = DIF_INSTR_VAR(instr);
+
+			ASSERT(id >= DIF_VAR_OTHER_UBASE);
+			id -= DIF_VAR_OTHER_UBASE;
+
+			svar = vstate->dtvs_globals[id];
+			ASSERT(svar != NULL);
+			v = &svar->dtsv_var;
+
+			if (v->dtdv_type.dtdt_flags & DIF_TF_BYREF) {
+				uintptr_t a = (uintptr_t)svar->dtsv_data;
+
+				ASSERT(a != NULL);
+				ASSERT(svar->dtsv_size != 0);
+
+				if (regs[rd] == NULL) {
+					*(uint8_t *)a = UINT8_MAX;
+					break;
+				} else {
+					*(uint8_t *)a = 0;
+					a += sizeof (uint64_t);
+				}
+				if (!dtrace_vcanload(
+				    (void *)(uintptr_t)regs[rd], &v->dtdv_type,
+				    mstate, vstate))
+					break;
+
+				dtrace_vcopy((void *)(uintptr_t)regs[rd],
+				    (void *)a, &v->dtdv_type);
+				break;
+			}
+
+			svar->dtsv_data = regs[rd];
+			break;
+
+		case DIF_OP_LDTA:
+			/*
+			 * There are no DTrace built-in thread-local arrays at
+			 * present.  This opcode is saved for future work.
+			 */
+			*flags |= CPU_DTRACE_ILLOP;
+			regs[rd] = 0;
+			break;
+
+		case DIF_OP_LDLS:
+			id = DIF_INSTR_VAR(instr);
+
+			if (id < DIF_VAR_OTHER_UBASE) {
+				/*
+				 * For now, this has no meaning.
+				 */
+				regs[rd] = 0;
+				break;
+			}
+
+			id -= DIF_VAR_OTHER_UBASE;
+
+			ASSERT(id < vstate->dtvs_nlocals);
+			ASSERT(vstate->dtvs_locals != NULL);
+
+			svar = vstate->dtvs_locals[id];
+			ASSERT(svar != NULL);
+			v = &svar->dtsv_var;
+
+			if (v->dtdv_type.dtdt_flags & DIF_TF_BYREF) {
+				uintptr_t a = (uintptr_t)svar->dtsv_data;
+				size_t sz = v->dtdv_type.dtdt_size;
+
+				sz += sizeof (uint64_t);
+				ASSERT(svar->dtsv_size == NCPU * sz);
+				a += CPU->cpu_id * sz;
+
+				if (*(uint8_t *)a == UINT8_MAX) {
+					/*
+					 * If the 0th byte is set to UINT8_MAX
+					 * then this is to be treated as a
+					 * reference to a NULL variable.
+					 */
+					regs[rd] = NULL;
+				} else {
+					regs[rd] = a + sizeof (uint64_t);
+				}
+
+				break;
+			}
+
+			ASSERT(svar->dtsv_size == NCPU * sizeof (uint64_t));
+			tmp = (uint64_t *)(uintptr_t)svar->dtsv_data;
+			regs[rd] = tmp[CPU->cpu_id];
+			break;
+
+		case DIF_OP_STLS:
+			id = DIF_INSTR_VAR(instr);
+
+			ASSERT(id >= DIF_VAR_OTHER_UBASE);
+			id -= DIF_VAR_OTHER_UBASE;
+			ASSERT(id < vstate->dtvs_nlocals);
+
+			ASSERT(vstate->dtvs_locals != NULL);
+			svar = vstate->dtvs_locals[id];
+			ASSERT(svar != NULL);
+			v = &svar->dtsv_var;
+
+			if (v->dtdv_type.dtdt_flags & DIF_TF_BYREF) {
+				uintptr_t a = (uintptr_t)svar->dtsv_data;
+				size_t sz = v->dtdv_type.dtdt_size;
+
+				sz += sizeof (uint64_t);
+				ASSERT(svar->dtsv_size == NCPU * sz);
+				a += CPU->cpu_id * sz;
+
+				if (regs[rd] == NULL) {
+					*(uint8_t *)a = UINT8_MAX;
+					break;
+				} else {
+					*(uint8_t *)a = 0;
+					a += sizeof (uint64_t);
+				}
+
+				if (!dtrace_vcanload(
+				    (void *)(uintptr_t)regs[rd], &v->dtdv_type,
+				    mstate, vstate))
+					break;
+
+				dtrace_vcopy((void *)(uintptr_t)regs[rd],
+				    (void *)a, &v->dtdv_type);
+				break;
+			}
+
+			ASSERT(svar->dtsv_size == NCPU * sizeof (uint64_t));
+			tmp = (uint64_t *)(uintptr_t)svar->dtsv_data;
+			tmp[CPU->cpu_id] = regs[rd];
+			break;
+
+		case DIF_OP_LDTS: {
+			dtrace_dynvar_t *dvar;
+			dtrace_key_t *key;
+
+			id = DIF_INSTR_VAR(instr);
+			ASSERT(id >= DIF_VAR_OTHER_UBASE);
+			id -= DIF_VAR_OTHER_UBASE;
+			v = &vstate->dtvs_tlocals[id];
+
+			key = &tupregs[DIF_DTR_NREGS];
+			key[0].dttk_value = (uint64_t)id;
+			key[0].dttk_size = 0;
+			DTRACE_TLS_THRKEY(key[1].dttk_value);
+			key[1].dttk_size = 0;
+
+			dvar = dtrace_dynvar(dstate, 2, key,
+			    sizeof (uint64_t), DTRACE_DYNVAR_NOALLOC,
+			    mstate, vstate);
+
+			if (dvar == NULL) {
+				regs[rd] = 0;
+				break;
+			}
+
+			if (v->dtdv_type.dtdt_flags & DIF_TF_BYREF) {
+				regs[rd] = (uint64_t)(uintptr_t)dvar->dtdv_data;
+			} else {
+				regs[rd] = *((uint64_t *)dvar->dtdv_data);
+			}
+
+			break;
+		}
+
+		case DIF_OP_STTS: {
+			dtrace_dynvar_t *dvar;
+			dtrace_key_t *key;
+
+			id = DIF_INSTR_VAR(instr);
+			ASSERT(id >= DIF_VAR_OTHER_UBASE);
+			id -= DIF_VAR_OTHER_UBASE;
+
+			key = &tupregs[DIF_DTR_NREGS];
+			key[0].dttk_value = (uint64_t)id;
+			key[0].dttk_size = 0;
+			DTRACE_TLS_THRKEY(key[1].dttk_value);
+			key[1].dttk_size = 0;
+			v = &vstate->dtvs_tlocals[id];
+
+			dvar = dtrace_dynvar(dstate, 2, key,
+			    v->dtdv_type.dtdt_size > sizeof (uint64_t) ?
+			    v->dtdv_type.dtdt_size : sizeof (uint64_t),
+			    regs[rd] ? DTRACE_DYNVAR_ALLOC :
+			    DTRACE_DYNVAR_DEALLOC, mstate, vstate);
+
+			/*
+			 * Given that we're storing to thread-local data,
+			 * we need to flush our predicate cache.
+			 */
+			curthread->t_predcache = NULL;
+
+			if (dvar == NULL)
+				break;
+
+			if (v->dtdv_type.dtdt_flags & DIF_TF_BYREF) {
+				if (!dtrace_vcanload(
+				    (void *)(uintptr_t)regs[rd],
+				    &v->dtdv_type, mstate, vstate))
+					break;
+
+				dtrace_vcopy((void *)(uintptr_t)regs[rd],
+				    dvar->dtdv_data, &v->dtdv_type);
+			} else {
+				*((uint64_t *)dvar->dtdv_data) = regs[rd];
+			}
+
+			break;
+		}
+
+		case DIF_OP_SRA:
+			regs[rd] = (int64_t)regs[r1] >> regs[r2];
+			break;
+
+		case DIF_OP_CALL:
+			dtrace_dif_subr(DIF_INSTR_SUBR(instr), rd,
+			    regs, tupregs, ttop, mstate, state);
+			break;
+
+		case DIF_OP_PUSHTR:
+			if (ttop == DIF_DTR_NREGS) {
+				*flags |= CPU_DTRACE_TUPOFLOW;
+				break;
+			}
+
+			if (r1 == DIF_TYPE_STRING) {
+				/*
+				 * If this is a string type and the size is 0,
+				 * we'll use the system-wide default string
+				 * size.  Note that we are _not_ looking at
+				 * the value of the DTRACEOPT_STRSIZE option;
+				 * had this been set, we would expect to have
+				 * a non-zero size value in the "pushtr".
+				 */
+				tupregs[ttop].dttk_size =
+				    dtrace_strlen((char *)(uintptr_t)regs[rd],
+				    regs[r2] ? regs[r2] :
+				    dtrace_strsize_default) + 1;
+			} else {
+				tupregs[ttop].dttk_size = regs[r2];
+			}
+
+			tupregs[ttop++].dttk_value = regs[rd];
+			break;
+
+		case DIF_OP_PUSHTV:
+			if (ttop == DIF_DTR_NREGS) {
+				*flags |= CPU_DTRACE_TUPOFLOW;
+				break;
+			}
+
+			tupregs[ttop].dttk_value = regs[rd];
+			tupregs[ttop++].dttk_size = 0;
+			break;
+
+		case DIF_OP_POPTS:
+			if (ttop != 0)
+				ttop--;
+			break;
+
+		case DIF_OP_FLUSHTS:
+			ttop = 0;
+			break;
+
+		case DIF_OP_LDGAA:
+		case DIF_OP_LDTAA: {
+			dtrace_dynvar_t *dvar;
+			dtrace_key_t *key = tupregs;
+			uint_t nkeys = ttop;
+
+			id = DIF_INSTR_VAR(instr);
+			ASSERT(id >= DIF_VAR_OTHER_UBASE);
+			id -= DIF_VAR_OTHER_UBASE;
+
+			key[nkeys].dttk_value = (uint64_t)id;
+			key[nkeys++].dttk_size = 0;
+
+			if (DIF_INSTR_OP(instr) == DIF_OP_LDTAA) {
+				DTRACE_TLS_THRKEY(key[nkeys].dttk_value);
+				key[nkeys++].dttk_size = 0;
+				v = &vstate->dtvs_tlocals[id];
+			} else {
+				v = &vstate->dtvs_globals[id]->dtsv_var;
+			}
+
+			dvar = dtrace_dynvar(dstate, nkeys, key,
+			    v->dtdv_type.dtdt_size > sizeof (uint64_t) ?
+			    v->dtdv_type.dtdt_size : sizeof (uint64_t),
+			    DTRACE_DYNVAR_NOALLOC, mstate, vstate);
+
+			if (dvar == NULL) {
+				regs[rd] = 0;
+				break;
+			}
+
+			if (v->dtdv_type.dtdt_flags & DIF_TF_BYREF) {
+				regs[rd] = (uint64_t)(uintptr_t)dvar->dtdv_data;
+			} else {
+				regs[rd] = *((uint64_t *)dvar->dtdv_data);
+			}
+
+			break;
+		}
+
+		case DIF_OP_STGAA:
+		case DIF_OP_STTAA: {
+			dtrace_dynvar_t *dvar;
+			dtrace_key_t *key = tupregs;
+			uint_t nkeys = ttop;
+
+			id = DIF_INSTR_VAR(instr);
+			ASSERT(id >= DIF_VAR_OTHER_UBASE);
+			id -= DIF_VAR_OTHER_UBASE;
+
+			key[nkeys].dttk_value = (uint64_t)id;
+			key[nkeys++].dttk_size = 0;
+
+			if (DIF_INSTR_OP(instr) == DIF_OP_STTAA) {
+				DTRACE_TLS_THRKEY(key[nkeys].dttk_value);
+				key[nkeys++].dttk_size = 0;
+				v = &vstate->dtvs_tlocals[id];
+			} else {
+				v = &vstate->dtvs_globals[id]->dtsv_var;
+			}
+
+			dvar = dtrace_dynvar(dstate, nkeys, key,
+			    v->dtdv_type.dtdt_size > sizeof (uint64_t) ?
+			    v->dtdv_type.dtdt_size : sizeof (uint64_t),
+			    regs[rd] ? DTRACE_DYNVAR_ALLOC :
+			    DTRACE_DYNVAR_DEALLOC, mstate, vstate);
+
+			if (dvar == NULL)
+				break;
+
+			if (v->dtdv_type.dtdt_flags & DIF_TF_BYREF) {
+				if (!dtrace_vcanload(
+				    (void *)(uintptr_t)regs[rd], &v->dtdv_type,
+				    mstate, vstate))
+					break;
+
+				dtrace_vcopy((void *)(uintptr_t)regs[rd],
+				    dvar->dtdv_data, &v->dtdv_type);
+			} else {
+				*((uint64_t *)dvar->dtdv_data) = regs[rd];
+			}
+
+			break;
+		}
+
+		case DIF_OP_ALLOCS: {
+			uintptr_t ptr = P2ROUNDUP(mstate->dtms_scratch_ptr, 8);
+			size_t size = ptr - mstate->dtms_scratch_ptr + regs[r1];
+
+			/*
+			 * Rounding up the user allocation size could have
+			 * overflowed large, bogus allocations (like -1ULL) to
+			 * 0.
+			 */
+			if (size < regs[r1] ||
+			    !DTRACE_INSCRATCH(mstate, size)) {
+				DTRACE_CPUFLAG_SET(CPU_DTRACE_NOSCRATCH);
+				regs[rd] = NULL;
+				break;
+			}
+
+			dtrace_bzero((void *) mstate->dtms_scratch_ptr, size);
+			mstate->dtms_scratch_ptr += size;
+			regs[rd] = ptr;
+			break;
+		}
+
+		case DIF_OP_COPYS:
+			if (!dtrace_canstore(regs[rd], regs[r2],
+			    mstate, vstate)) {
+				*flags |= CPU_DTRACE_BADADDR;
+				*illval = regs[rd];
+				break;
+			}
+
+			if (!dtrace_canload(regs[r1], regs[r2], mstate, vstate))
+				break;
+
+			dtrace_bcopy((void *)(uintptr_t)regs[r1],
+			    (void *)(uintptr_t)regs[rd], (size_t)regs[r2]);
+			break;
+
+		case DIF_OP_STB:
+			if (!dtrace_canstore(regs[rd], 1, mstate, vstate)) {
+				*flags |= CPU_DTRACE_BADADDR;
+				*illval = regs[rd];
+				break;
+			}
+			*((uint8_t *)(uintptr_t)regs[rd]) = (uint8_t)regs[r1];
+			break;
+
+		case DIF_OP_STH:
+			if (!dtrace_canstore(regs[rd], 2, mstate, vstate)) {
+				*flags |= CPU_DTRACE_BADADDR;
+				*illval = regs[rd];
+				break;
+			}
+			if (regs[rd] & 1) {
+				*flags |= CPU_DTRACE_BADALIGN;
+				*illval = regs[rd];
+				break;
+			}
+			*((uint16_t *)(uintptr_t)regs[rd]) = (uint16_t)regs[r1];
+			break;
+
+		case DIF_OP_STW:
+			if (!dtrace_canstore(regs[rd], 4, mstate, vstate)) {
+				*flags |= CPU_DTRACE_BADADDR;
+				*illval = regs[rd];
+				break;
+			}
+			if (regs[rd] & 3) {
+				*flags |= CPU_DTRACE_BADALIGN;
+				*illval = regs[rd];
+				break;
+			}
+			*((uint32_t *)(uintptr_t)regs[rd]) = (uint32_t)regs[r1];
+			break;
+
+		case DIF_OP_STX:
+			if (!dtrace_canstore(regs[rd], 8, mstate, vstate)) {
+				*flags |= CPU_DTRACE_BADADDR;
+				*illval = regs[rd];
+				break;
+			}
+			if (regs[rd] & 7) {
+				*flags |= CPU_DTRACE_BADALIGN;
+				*illval = regs[rd];
+				break;
+			}
+			*((uint64_t *)(uintptr_t)regs[rd]) = regs[r1];
+			break;
+		}
+	}
+
+	if (!(*flags & CPU_DTRACE_FAULT))
+		return (rval);
+
+	mstate->dtms_fltoffs = opc * sizeof (dif_instr_t);
+	mstate->dtms_present |= DTRACE_MSTATE_FLTOFFS;
+
+	return (0);
+}
+
+static void
+dtrace_action_breakpoint(dtrace_ecb_t *ecb)
+{
+	dtrace_probe_t *probe = ecb->dte_probe;
+	dtrace_provider_t *prov = probe->dtpr_provider;
+	char c[DTRACE_FULLNAMELEN + 80], *str;
+	char *msg = "dtrace: breakpoint action at probe ";
+	char *ecbmsg = " (ecb ";
+	uintptr_t mask = (0xf << (sizeof (uintptr_t) * NBBY / 4));
+	uintptr_t val = (uintptr_t)ecb;
+	int shift = (sizeof (uintptr_t) * NBBY) - 4, i = 0;
+
+	if (dtrace_destructive_disallow)
+		return;
+
+	/*
+	 * It's impossible to be taking action on the NULL probe.
+	 */
+	ASSERT(probe != NULL);
+
+	/*
+	 * This is a poor man's (destitute man's?) sprintf():  we want to
+	 * print the provider name, module name, function name and name of
+	 * the probe, along with the hex address of the ECB with the breakpoint
+	 * action -- all of which we must place in the character buffer by
+	 * hand.
+	 */
+	while (*msg != '\0')
+		c[i++] = *msg++;
+
+	for (str = prov->dtpv_name; *str != '\0'; str++)
+		c[i++] = *str;
+	c[i++] = ':';
+
+	for (str = probe->dtpr_mod; *str != '\0'; str++)
+		c[i++] = *str;
+	c[i++] = ':';
+
+	for (str = probe->dtpr_func; *str != '\0'; str++)
+		c[i++] = *str;
+	c[i++] = ':';
+
+	for (str = probe->dtpr_name; *str != '\0'; str++)
+		c[i++] = *str;
+
+	while (*ecbmsg != '\0')
+		c[i++] = *ecbmsg++;
+
+	while (shift >= 0) {
+		mask = (uintptr_t)0xf << shift;
+
+		if (val >= ((uintptr_t)1 << shift))
+			c[i++] = "0123456789abcdef"[(val & mask) >> shift];
+		shift -= 4;
+	}
+
+	c[i++] = ')';
+	c[i] = '\0';
+
+	debug_enter(c);
+}
+
+static void
+dtrace_action_panic(dtrace_ecb_t *ecb)
+{
+	dtrace_probe_t *probe = ecb->dte_probe;
+
+	/*
+	 * It's impossible to be taking action on the NULL probe.
+	 */
+	ASSERT(probe != NULL);
+
+	if (dtrace_destructive_disallow)
+		return;
+
+	if (dtrace_panicked != NULL)
+		return;
+
+	if (dtrace_casptr(&dtrace_panicked, NULL, curthread) != NULL)
+		return;
+
+	/*
+	 * We won the right to panic.  (We want to be sure that only one
+	 * thread calls panic() from dtrace_probe(), and that panic() is
+	 * called exactly once.)
+	 */
+	dtrace_panic("dtrace: panic action at probe %s:%s:%s:%s (ecb %p)",
+	    probe->dtpr_provider->dtpv_name, probe->dtpr_mod,
+	    probe->dtpr_func, probe->dtpr_name, (void *)ecb);
+}
+
+static void
+dtrace_action_raise(uint64_t sig)
+{
+	if (dtrace_destructive_disallow)
+		return;
+
+	if (sig >= NSIG) {
+		DTRACE_CPUFLAG_SET(CPU_DTRACE_ILLOP);
+		return;
+	}
+
+	/*
+	 * raise() has a queue depth of 1 -- we ignore all subsequent
+	 * invocations of the raise() action.
+	 */
+	if (curthread->t_dtrace_sig == 0)
+		curthread->t_dtrace_sig = (uint8_t)sig;
+
+	curthread->t_sig_check = 1;
+	aston(curthread);
+}
+
+static void
+dtrace_action_stop(void)
+{
+	if (dtrace_destructive_disallow)
+		return;
+
+	if (!curthread->t_dtrace_stop) {
+		curthread->t_dtrace_stop = 1;
+		curthread->t_sig_check = 1;
+		aston(curthread);
+	}
+}
+
+static void
+dtrace_action_chill(dtrace_mstate_t *mstate, hrtime_t val)
+{
+	hrtime_t now;
+	volatile uint16_t *flags;
+	cpu_t *cpu = CPU;
+
+	if (dtrace_destructive_disallow)
+		return;
+
+	flags = (volatile uint16_t *)&cpu_core[cpu->cpu_id].cpuc_dtrace_flags;
+
+	now = dtrace_gethrtime();
+
+	if (now - cpu->cpu_dtrace_chillmark > dtrace_chill_interval) {
+		/*
+		 * We need to advance the mark to the current time.
+		 */
+		cpu->cpu_dtrace_chillmark = now;
+		cpu->cpu_dtrace_chilled = 0;
+	}
+
+	/*
+	 * Now check to see if the requested chill time would take us over
+	 * the maximum amount of time allowed in the chill interval.  (Or
+	 * worse, if the calculation itself induces overflow.)
+	 */
+	if (cpu->cpu_dtrace_chilled + val > dtrace_chill_max ||
+	    cpu->cpu_dtrace_chilled + val < cpu->cpu_dtrace_chilled) {
+		*flags |= CPU_DTRACE_ILLOP;
+		return;
+	}
+
+	while (dtrace_gethrtime() - now < val)
+		continue;
+
+	/*
+	 * Normally, we assure that the value of the variable "timestamp" does
+	 * not change within an ECB.  The presence of chill() represents an
+	 * exception to this rule, however.
+	 */
+	mstate->dtms_present &= ~DTRACE_MSTATE_TIMESTAMP;
+	cpu->cpu_dtrace_chilled += val;
+}
+
+static void
+dtrace_action_ustack(dtrace_mstate_t *mstate, dtrace_state_t *state,
+    uint64_t *buf, uint64_t arg)
+{
+	int nframes = DTRACE_USTACK_NFRAMES(arg);
+	int strsize = DTRACE_USTACK_STRSIZE(arg);
+	uint64_t *pcs = &buf[1], *fps;
+	char *str = (char *)&pcs[nframes];
+	int size, offs = 0, i, j;
+	uintptr_t old = mstate->dtms_scratch_ptr, saved;
+	uint16_t *flags = &cpu_core[CPU->cpu_id].cpuc_dtrace_flags;
+	char *sym;
+
+	/*
+	 * Should be taking a faster path if string space has not been
+	 * allocated.
+	 */
+	ASSERT(strsize != 0);
+
+	/*
+	 * We will first allocate some temporary space for the frame pointers.
+	 */
+	fps = (uint64_t *)P2ROUNDUP(mstate->dtms_scratch_ptr, 8);
+	size = (uintptr_t)fps - mstate->dtms_scratch_ptr +
+	    (nframes * sizeof (uint64_t));
+
+	if (!DTRACE_INSCRATCH(mstate, size)) {
+		/*
+		 * Not enough room for our frame pointers -- need to indicate
+		 * that we ran out of scratch space.
+		 */
+		DTRACE_CPUFLAG_SET(CPU_DTRACE_NOSCRATCH);
+		return;
+	}
+
+	mstate->dtms_scratch_ptr += size;
+	saved = mstate->dtms_scratch_ptr;
+
+	/*
+	 * Now get a stack with both program counters and frame pointers.
+	 */
+	DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT);
+	dtrace_getufpstack(buf, fps, nframes + 1);
+	DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT);
+
+	/*
+	 * If that faulted, we're cooked.
+	 */
+	if (*flags & CPU_DTRACE_FAULT)
+		goto out;
+
+	/*
+	 * Now we want to walk up the stack, calling the USTACK helper.  For
+	 * each iteration, we restore the scratch pointer.
+	 */
+	for (i = 0; i < nframes; i++) {
+		mstate->dtms_scratch_ptr = saved;
+
+		if (offs >= strsize)
+			break;
+
+		sym = (char *)(uintptr_t)dtrace_helper(
+		    DTRACE_HELPER_ACTION_USTACK,
+		    mstate, state, pcs[i], fps[i]);
+
+		/*
+		 * If we faulted while running the helper, we're going to
+		 * clear the fault and null out the corresponding string.
+		 */
+		if (*flags & CPU_DTRACE_FAULT) {
+			*flags &= ~CPU_DTRACE_FAULT;
+			str[offs++] = '\0';
+			continue;
+		}
+
+		if (sym == NULL) {
+			str[offs++] = '\0';
+			continue;
+		}
+
+		DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT);
+
+		/*
+		 * Now copy in the string that the helper returned to us.
+		 */
+		for (j = 0; offs + j < strsize; j++) {
+			if ((str[offs + j] = sym[j]) == '\0')
+				break;
+		}
+
+		DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT);
+
+		offs += j + 1;
+	}
+
+	if (offs >= strsize) {
+		/*
+		 * If we didn't have room for all of the strings, we don't
+		 * abort processing -- this needn't be a fatal error -- but we
+		 * still want to increment a counter (dts_stkstroverflows) to
+		 * allow this condition to be warned about.  (If this is from
+		 * a jstack() action, it is easily tuned via jstackstrsize.)
+		 */
+		dtrace_error(&state->dts_stkstroverflows);
+	}
+
+	while (offs < strsize)
+		str[offs++] = '\0';
+
+out:
+	mstate->dtms_scratch_ptr = old;
+}
+
+/*
+ * If you're looking for the epicenter of DTrace, you just found it.  This
+ * is the function called by the provider to fire a probe -- from which all
+ * subsequent probe-context DTrace activity emanates.
+ */
+void
+dtrace_probe(dtrace_id_t id, uintptr_t arg0, uintptr_t arg1,
+    uintptr_t arg2, uintptr_t arg3, uintptr_t arg4)
+{
+	processorid_t cpuid;
+	dtrace_icookie_t cookie;
+	dtrace_probe_t *probe;
+	dtrace_mstate_t mstate;
+	dtrace_ecb_t *ecb;
+	dtrace_action_t *act;
+	intptr_t offs;
+	size_t size;
+	int vtime, onintr;
+	volatile uint16_t *flags;
+	hrtime_t now;
+
+	/*
+	 * Kick out immediately if this CPU is still being born (in which case
+	 * curthread will be set to -1) or the current thread can't allow
+	 * probes in its current context.
+	 */
+	if (((uintptr_t)curthread & 1) || (curthread->t_flag & T_DONTDTRACE))
+		return;
+
+	cookie = dtrace_interrupt_disable();
+	probe = dtrace_probes[id - 1];
+	cpuid = CPU->cpu_id;
+	onintr = CPU_ON_INTR(CPU);
+
+	if (!onintr && probe->dtpr_predcache != DTRACE_CACHEIDNONE &&
+	    probe->dtpr_predcache == curthread->t_predcache) {
+		/*
+		 * We have hit in the predicate cache; we know that
+		 * this predicate would evaluate to be false.
+		 */
+		dtrace_interrupt_enable(cookie);
+		return;
+	}
+
+	if (panic_quiesce) {
+		/*
+		 * We don't trace anything if we're panicking.
+		 */
+		dtrace_interrupt_enable(cookie);
+		return;
+	}
+
+	now = dtrace_gethrtime();
+	vtime = dtrace_vtime_references != 0;
+
+	if (vtime && curthread->t_dtrace_start)
+		curthread->t_dtrace_vtime += now - curthread->t_dtrace_start;
+
+	mstate.dtms_difo = NULL;
+	mstate.dtms_probe = probe;
+	mstate.dtms_strtok = NULL;
+	mstate.dtms_arg[0] = arg0;
+	mstate.dtms_arg[1] = arg1;
+	mstate.dtms_arg[2] = arg2;
+	mstate.dtms_arg[3] = arg3;
+	mstate.dtms_arg[4] = arg4;
+
+	flags = (volatile uint16_t *)&cpu_core[cpuid].cpuc_dtrace_flags;
+
+	for (ecb = probe->dtpr_ecb; ecb != NULL; ecb = ecb->dte_next) {
+		dtrace_predicate_t *pred = ecb->dte_predicate;
+		dtrace_state_t *state = ecb->dte_state;
+		dtrace_buffer_t *buf = &state->dts_buffer[cpuid];
+		dtrace_buffer_t *aggbuf = &state->dts_aggbuffer[cpuid];
+		dtrace_vstate_t *vstate = &state->dts_vstate;
+		dtrace_provider_t *prov = probe->dtpr_provider;
+		int committed = 0;
+		caddr_t tomax;
+
+		/*
+		 * A little subtlety with the following (seemingly innocuous)
+		 * declaration of the automatic 'val':  by looking at the
+		 * code, you might think that it could be declared in the
+		 * action processing loop, below.  (That is, it's only used in
+		 * the action processing loop.)  However, it must be declared
+		 * out of that scope because in the case of DIF expression
+		 * arguments to aggregating actions, one iteration of the
+		 * action loop will use the last iteration's value.
+		 */
+#ifdef lint
+		uint64_t val = 0;
+#else
+		uint64_t val;
+#endif
+
+		mstate.dtms_present = DTRACE_MSTATE_ARGS | DTRACE_MSTATE_PROBE;
+		*flags &= ~CPU_DTRACE_ERROR;
+
+		if (prov == dtrace_provider) {
+			/*
+			 * If dtrace itself is the provider of this probe,
+			 * we're only going to continue processing the ECB if
+			 * arg0 (the dtrace_state_t) is equal to the ECB's
+			 * creating state.  (This prevents disjoint consumers
+			 * from seeing one another's metaprobes.)
+			 */
+			if (arg0 != (uint64_t)(uintptr_t)state)
+				continue;
+		}
+
+		if (state->dts_activity != DTRACE_ACTIVITY_ACTIVE) {
+			/*
+			 * We're not currently active.  If our provider isn't
+			 * the dtrace pseudo provider, we're not interested.
+			 */
+			if (prov != dtrace_provider)
+				continue;
+
+			/*
+			 * Now we must further check if we are in the BEGIN
+			 * probe.  If we are, we will only continue processing
+			 * if we're still in WARMUP -- if one BEGIN enabling
+			 * has invoked the exit() action, we don't want to
+			 * evaluate subsequent BEGIN enablings.
+			 */
+			if (probe->dtpr_id == dtrace_probeid_begin &&
+			    state->dts_activity != DTRACE_ACTIVITY_WARMUP) {
+				ASSERT(state->dts_activity ==
+				    DTRACE_ACTIVITY_DRAINING);
+				continue;
+			}
+		}
+
+		if (ecb->dte_cond) {
+			/*
+			 * If the dte_cond bits indicate that this
+			 * consumer is only allowed to see user-mode firings
+			 * of this probe, call the provider's dtps_usermode()
+			 * entry point to check that the probe was fired
+			 * while in a user context. Skip this ECB if that's
+			 * not the case.
+			 */
+			if ((ecb->dte_cond & DTRACE_COND_USERMODE) &&
+			    prov->dtpv_pops.dtps_usermode(prov->dtpv_arg,
+			    probe->dtpr_id, probe->dtpr_arg) == 0)
+				continue;
+
+			/*
+			 * This is more subtle than it looks. We have to be
+			 * absolutely certain that CRED() isn't going to
+			 * change out from under us so it's only legit to
+			 * examine that structure if we're in constrained
+			 * situations. Currently, the only times we'll this
+			 * check is if a non-super-user has enabled the
+			 * profile or syscall providers -- providers that
+			 * allow visibility of all processes. For the
+			 * profile case, the check above will ensure that
+			 * we're examining a user context.
+			 */
+			if (ecb->dte_cond & DTRACE_COND_OWNER) {
+				cred_t *cr;
+				cred_t *s_cr =
+				    ecb->dte_state->dts_cred.dcr_cred;
+				proc_t *proc;
+
+				ASSERT(s_cr != NULL);
+
+				if ((cr = CRED()) == NULL ||
+				    s_cr->cr_uid != cr->cr_uid ||
+				    s_cr->cr_uid != cr->cr_ruid ||
+				    s_cr->cr_uid != cr->cr_suid ||
+				    s_cr->cr_gid != cr->cr_gid ||
+				    s_cr->cr_gid != cr->cr_rgid ||
+				    s_cr->cr_gid != cr->cr_sgid ||
+				    (proc = ttoproc(curthread)) == NULL ||
+				    (proc->p_flag & SNOCD))
+					continue;
+			}
+
+			if (ecb->dte_cond & DTRACE_COND_ZONEOWNER) {
+				cred_t *cr;
+				cred_t *s_cr =
+				    ecb->dte_state->dts_cred.dcr_cred;
+
+				ASSERT(s_cr != NULL);
+
+				if ((cr = CRED()) == NULL ||
+				    s_cr->cr_zone->zone_id !=
+				    cr->cr_zone->zone_id)
+					continue;
+			}
+		}
+
+		if (now - state->dts_alive > dtrace_deadman_timeout) {
+			/*
+			 * We seem to be dead.  Unless we (a) have kernel
+			 * destructive permissions (b) have expicitly enabled
+			 * destructive actions and (c) destructive actions have
+			 * not been disabled, we're going to transition into
+			 * the KILLED state, from which no further processing
+			 * on this state will be performed.
+			 */
+			if (!dtrace_priv_kernel_destructive(state) ||
+			    !state->dts_cred.dcr_destructive ||
+			    dtrace_destructive_disallow) {
+				void *activity = &state->dts_activity;
+				dtrace_activity_t current;
+
+				do {
+					current = state->dts_activity;
+				} while (dtrace_cas32(activity, current,
+				    DTRACE_ACTIVITY_KILLED) != current);
+
+				continue;
+			}
+		}
+
+		if ((offs = dtrace_buffer_reserve(buf, ecb->dte_needed,
+		    ecb->dte_alignment, state, &mstate)) < 0)
+			continue;
+
+		tomax = buf->dtb_tomax;
+		ASSERT(tomax != NULL);
+
+		if (ecb->dte_size != 0)
+			DTRACE_STORE(uint32_t, tomax, offs, ecb->dte_epid);
+
+		mstate.dtms_epid = ecb->dte_epid;
+		mstate.dtms_present |= DTRACE_MSTATE_EPID;
+
+		if (state->dts_cred.dcr_visible & DTRACE_CRV_KERNEL)
+			mstate.dtms_access = DTRACE_ACCESS_KERNEL;
+		else
+			mstate.dtms_access = 0;
+
+		if (pred != NULL) {
+			dtrace_difo_t *dp = pred->dtp_difo;
+			int rval;
+
+			rval = dtrace_dif_emulate(dp, &mstate, vstate, state);
+
+			if (!(*flags & CPU_DTRACE_ERROR) && !rval) {
+				dtrace_cacheid_t cid = probe->dtpr_predcache;
+
+				if (cid != DTRACE_CACHEIDNONE && !onintr) {
+					/*
+					 * Update the predicate cache...
+					 */
+					ASSERT(cid == pred->dtp_cacheid);
+					curthread->t_predcache = cid;
+				}
+
+				continue;
+			}
+		}
+
+		for (act = ecb->dte_action; !(*flags & CPU_DTRACE_ERROR) &&
+		    act != NULL; act = act->dta_next) {
+			size_t valoffs;
+			dtrace_difo_t *dp;
+			dtrace_recdesc_t *rec = &act->dta_rec;
+
+			size = rec->dtrd_size;
+			valoffs = offs + rec->dtrd_offset;
+
+			if (DTRACEACT_ISAGG(act->dta_kind)) {
+				uint64_t v = 0xbad;
+				dtrace_aggregation_t *agg;
+
+				agg = (dtrace_aggregation_t *)act;
+
+				if ((dp = act->dta_difo) != NULL)
+					v = dtrace_dif_emulate(dp,
+					    &mstate, vstate, state);
+
+				if (*flags & CPU_DTRACE_ERROR)
+					continue;
+
+				/*
+				 * Note that we always pass the expression
+				 * value from the previous iteration of the
+				 * action loop.  This value will only be used
+				 * if there is an expression argument to the
+				 * aggregating action, denoted by the
+				 * dtag_hasarg field.
+				 */
+				dtrace_aggregate(agg, buf,
+				    offs, aggbuf, v, val);
+				continue;
+			}
+
+			switch (act->dta_kind) {
+			case DTRACEACT_STOP:
+				if (dtrace_priv_proc_destructive(state))
+					dtrace_action_stop();
+				continue;
+
+			case DTRACEACT_BREAKPOINT:
+				if (dtrace_priv_kernel_destructive(state))
+					dtrace_action_breakpoint(ecb);
+				continue;
+
+			case DTRACEACT_PANIC:
+				if (dtrace_priv_kernel_destructive(state))
+					dtrace_action_panic(ecb);
+				continue;
+
+			case DTRACEACT_STACK:
+				if (!dtrace_priv_kernel(state))
+					continue;
+
+				dtrace_getpcstack((pc_t *)(tomax + valoffs),
+				    size / sizeof (pc_t), probe->dtpr_aframes,
+				    DTRACE_ANCHORED(probe) ? NULL :
+				    (uint32_t *)arg0);
+
+				continue;
+
+			case DTRACEACT_JSTACK:
+			case DTRACEACT_USTACK:
+				if (!dtrace_priv_proc(state))
+					continue;
+
+				/*
+				 * See comment in DIF_VAR_PID.
+				 */
+				if (DTRACE_ANCHORED(mstate.dtms_probe) &&
+				    CPU_ON_INTR(CPU)) {
+					int depth = DTRACE_USTACK_NFRAMES(
+					    rec->dtrd_arg) + 1;
+
+					dtrace_bzero((void *)(tomax + valoffs),
+					    DTRACE_USTACK_STRSIZE(rec->dtrd_arg)
+					    + depth * sizeof (uint64_t));
+
+					continue;
+				}
+
+				if (DTRACE_USTACK_STRSIZE(rec->dtrd_arg) != 0 &&
+				    curproc->p_dtrace_helpers != NULL) {
+					/*
+					 * This is the slow path -- we have
+					 * allocated string space, and we're
+					 * getting the stack of a process that
+					 * has helpers.  Call into a separate
+					 * routine to perform this processing.
+					 */
+					dtrace_action_ustack(&mstate, state,
+					    (uint64_t *)(tomax + valoffs),
+					    rec->dtrd_arg);
+					continue;
+				}
+
+				DTRACE_CPUFLAG_SET(CPU_DTRACE_NOFAULT);
+				dtrace_getupcstack((uint64_t *)
+				    (tomax + valoffs),
+				    DTRACE_USTACK_NFRAMES(rec->dtrd_arg) + 1);
+				DTRACE_CPUFLAG_CLEAR(CPU_DTRACE_NOFAULT);
+				continue;
+
+			default:
+				break;
+			}
+
+			dp = act->dta_difo;
+			ASSERT(dp != NULL);
+
+			val = dtrace_dif_emulate(dp, &mstate, vstate, state);
+
+			if (*flags & CPU_DTRACE_ERROR)
+				continue;
+
+			switch (act->dta_kind) {
+			case DTRACEACT_SPECULATE:
+				ASSERT(buf == &state->dts_buffer[cpuid]);
+				buf = dtrace_speculation_buffer(state,
+				    cpuid, val);
+
+				if (buf == NULL) {
+					*flags |= CPU_DTRACE_DROP;
+					continue;
+				}
+
+				offs = dtrace_buffer_reserve(buf,
+				    ecb->dte_needed, ecb->dte_alignment,
+				    state, NULL);
+
+				if (offs < 0) {
+					*flags |= CPU_DTRACE_DROP;
+					continue;
+				}
+
+				tomax = buf->dtb_tomax;
+				ASSERT(tomax != NULL);
+
+				if (ecb->dte_size != 0)
+					DTRACE_STORE(uint32_t, tomax, offs,
+					    ecb->dte_epid);
+				continue;
+
+			case DTRACEACT_CHILL:
+				if (dtrace_priv_kernel_destructive(state))
+					dtrace_action_chill(&mstate, val);
+				continue;
+
+			case DTRACEACT_RAISE:
+				if (dtrace_priv_proc_destructive(state))
+					dtrace_action_raise(val);
+				continue;
+
+			case DTRACEACT_COMMIT:
+				ASSERT(!committed);
+
+				/*
+				 * We need to commit our buffer state.
+				 */
+				if (ecb->dte_size)
+					buf->dtb_offset = offs + ecb->dte_size;
+				buf = &state->dts_buffer[cpuid];
+				dtrace_speculation_commit(state, cpuid, val);
+				committed = 1;
+				continue;
+
+			case DTRACEACT_DISCARD:
+				dtrace_speculation_discard(state, cpuid, val);
+				continue;
+
+			case DTRACEACT_DIFEXPR:
+			case DTRACEACT_LIBACT:
+			case DTRACEACT_PRINTF:
+			case DTRACEACT_PRINTA:
+			case DTRACEACT_SYSTEM:
+			case DTRACEACT_FREOPEN:
+				break;
+
+			case DTRACEACT_SYM:
+			case DTRACEACT_MOD:
+				if (!dtrace_priv_kernel(state))
+					continue;
+				break;
+
+			case DTRACEACT_USYM:
+			case DTRACEACT_UMOD:
+			case DTRACEACT_UADDR: {
+				struct pid *pid = curthread->t_procp->p_pidp;
+
+				if (!dtrace_priv_proc(state))
+					continue;
+
+				DTRACE_STORE(uint64_t, tomax,
+				    valoffs, (uint64_t)pid->pid_id);
+				DTRACE_STORE(uint64_t, tomax,
+				    valoffs + sizeof (uint64_t), val);
+
+				continue;
+			}
+
+			case DTRACEACT_EXIT: {
+				/*
+				 * For the exit action, we are going to attempt
+				 * to atomically set our activity to be
+				 * draining.  If this fails (either because
+				 * another CPU has beat us to the exit action,
+				 * or because our current activity is something
+				 * other than ACTIVE or WARMUP), we will
+				 * continue.  This assures that the exit action
+				 * can be successfully recorded at most once
+				 * when we're in the ACTIVE state.  If we're
+				 * encountering the exit() action while in
+				 * COOLDOWN, however, we want to honor the new
+				 * status code.  (We know that we're the only
+				 * thread in COOLDOWN, so there is no race.)
+				 */
+				void *activity = &state->dts_activity;
+				dtrace_activity_t current = state->dts_activity;
+
+				if (current == DTRACE_ACTIVITY_COOLDOWN)
+					break;
+
+				if (current != DTRACE_ACTIVITY_WARMUP)
+					current = DTRACE_ACTIVITY_ACTIVE;
+
+				if (dtrace_cas32(activity, current,
+				    DTRACE_ACTIVITY_DRAINING) != current) {
+					*flags |= CPU_DTRACE_DROP;
+					continue;
+				}
+
+				break;
+			}
+
+			default:
+				ASSERT(0);
+			}
+
+			if (dp->dtdo_rtype.dtdt_flags & DIF_TF_BYREF) {
+				uintptr_t end = valoffs + size;
+
+				if (!dtrace_vcanload((void *)(uintptr_t)val,
+				    &dp->dtdo_rtype, &mstate, vstate))
+					continue;
+
+				/*
+				 * If this is a string, we're going to only
+				 * load until we find the zero byte -- after
+				 * which we'll store zero bytes.
+				 */
+				if (dp->dtdo_rtype.dtdt_kind ==
+				    DIF_TYPE_STRING) {
+					char c = '\0' + 1;
+					int intuple = act->dta_intuple;
+					size_t s;
+
+					for (s = 0; s < size; s++) {
+						if (c != '\0')
+							c = dtrace_load8(val++);
+
+						DTRACE_STORE(uint8_t, tomax,
+						    valoffs++, c);
+
+						if (c == '\0' && intuple)
+							break;
+					}
+
+					continue;
+				}
+
+				while (valoffs < end) {
+					DTRACE_STORE(uint8_t, tomax, valoffs++,
+					    dtrace_load8(val++));
+				}
+
+				continue;
+			}
+
+			switch (size) {
+			case 0:
+				break;
+
+			case sizeof (uint8_t):
+				DTRACE_STORE(uint8_t, tomax, valoffs, val);
+				break;
+			case sizeof (uint16_t):
+				DTRACE_STORE(uint16_t, tomax, valoffs, val);
+				break;
+			case sizeof (uint32_t):
+				DTRACE_STORE(uint32_t, tomax, valoffs, val);
+				break;
+			case sizeof (uint64_t):
+				DTRACE_STORE(uint64_t, tomax, valoffs, val);
+				break;
+			default:
+				/*
+				 * Any other size should have been returned by
+				 * reference, not by value.
+				 */
+				ASSERT(0);
+				break;
+			}
+		}
+
+		if (*flags & CPU_DTRACE_DROP)
+			continue;
+
+		if (*flags & CPU_DTRACE_FAULT) {
+			int ndx;
+			dtrace_action_t *err;
+
+			buf->dtb_errors++;
+
+			if (probe->dtpr_id == dtrace_probeid_error) {
+				/*
+				 * There's nothing we can do -- we had an
+				 * error on the error probe.  We bump an
+				 * error counter to at least indicate that
+				 * this condition happened.
+				 */
+				dtrace_error(&state->dts_dblerrors);
+				continue;
+			}
+
+			if (vtime) {
+				/*
+				 * Before recursing on dtrace_probe(), we
+				 * need to explicitly clear out our start
+				 * time to prevent it from being accumulated
+				 * into t_dtrace_vtime.
+				 */
+				curthread->t_dtrace_start = 0;
+			}
+
+			/*
+			 * Iterate over the actions to figure out which action
+			 * we were processing when we experienced the error.
+			 * Note that act points _past_ the faulting action; if
+			 * act is ecb->dte_action, the fault was in the
+			 * predicate, if it's ecb->dte_action->dta_next it's
+			 * in action #1, and so on.
+			 */
+			for (err = ecb->dte_action, ndx = 0;
+			    err != act; err = err->dta_next, ndx++)
+				continue;
+
+			dtrace_probe_error(state, ecb->dte_epid, ndx,
+			    (mstate.dtms_present & DTRACE_MSTATE_FLTOFFS) ?
+			    mstate.dtms_fltoffs : -1, DTRACE_FLAGS2FLT(*flags),
+			    cpu_core[cpuid].cpuc_dtrace_illval);
+
+			continue;
+		}
+
+		if (!committed)
+			buf->dtb_offset = offs + ecb->dte_size;
+	}
+
+	if (vtime)
+		curthread->t_dtrace_start = dtrace_gethrtime();
+
+	dtrace_interrupt_enable(cookie);
+}
+
+/*
+ * DTrace Probe Hashing Functions
+ *
+ * The functions in this section (and indeed, the functions in remaining
+ * sections) are not _called_ from probe context.  (Any exceptions to this are
+ * marked with a "Note:".)  Rather, they are called from elsewhere in the
+ * DTrace framework to look-up probes in, add probes to and remove probes from
+ * the DTrace probe hashes.  (Each probe is hashed by each element of the
+ * probe tuple -- allowing for fast lookups, regardless of what was
+ * specified.)
+ */
+static uint_t
+dtrace_hash_str(char *p)
+{
+	unsigned int g;
+	uint_t hval = 0;
+
+	while (*p) {
+		hval = (hval << 4) + *p++;
+		if ((g = (hval & 0xf0000000)) != 0)
+			hval ^= g >> 24;
+		hval &= ~g;
+	}
+	return (hval);
+}
+
+static dtrace_hash_t *
+dtrace_hash_create(uintptr_t stroffs, uintptr_t nextoffs, uintptr_t prevoffs)
+{
+	dtrace_hash_t *hash = kmem_zalloc(sizeof (dtrace_hash_t), KM_SLEEP);
+
+	hash->dth_stroffs = stroffs;
+	hash->dth_nextoffs = nextoffs;
+	hash->dth_prevoffs = prevoffs;
+
+	hash->dth_size = 1;
+	hash->dth_mask = hash->dth_size - 1;
+
+	hash->dth_tab = kmem_zalloc(hash->dth_size *
+	    sizeof (dtrace_hashbucket_t *), KM_SLEEP);
+
+	return (hash);
+}
+
+static void
+dtrace_hash_destroy(dtrace_hash_t *hash)
+{
+#ifdef DEBUG
+	int i;
+
+	for (i = 0; i < hash->dth_size; i++)
+		ASSERT(hash->dth_tab[i] == NULL);
+#endif
+
+	kmem_free(hash->dth_tab,
+	    hash->dth_size * sizeof (dtrace_hashbucket_t *));
+	kmem_free(hash, sizeof (dtrace_hash_t));
+}
+
+static void
+dtrace_hash_resize(dtrace_hash_t *hash)
+{
+	int size = hash->dth_size, i, ndx;
+	int new_size = hash->dth_size << 1;
+	int new_mask = new_size - 1;
+	dtrace_hashbucket_t **new_tab, *bucket, *next;
+
+	ASSERT((new_size & new_mask) == 0);
+
+	new_tab = kmem_zalloc(new_size * sizeof (void *), KM_SLEEP);
+
+	for (i = 0; i < size; i++) {
+		for (bucket = hash->dth_tab[i]; bucket != NULL; bucket = next) {
+			dtrace_probe_t *probe = bucket->dthb_chain;
+
+			ASSERT(probe != NULL);
+			ndx = DTRACE_HASHSTR(hash, probe) & new_mask;
+
+			next = bucket->dthb_next;
+			bucket->dthb_next = new_tab[ndx];
+			new_tab[ndx] = bucket;
+		}
+	}
+
+	kmem_free(hash->dth_tab, hash->dth_size * sizeof (void *));
+	hash->dth_tab = new_tab;
+	hash->dth_size = new_size;
+	hash->dth_mask = new_mask;
+}
+
+static void
+dtrace_hash_add(dtrace_hash_t *hash, dtrace_probe_t *new)
+{
+	int hashval = DTRACE_HASHSTR(hash, new);
+	int ndx = hashval & hash->dth_mask;
+	dtrace_hashbucket_t *bucket = hash->dth_tab[ndx];
+	dtrace_probe_t **nextp, **prevp;
+
+	for (; bucket != NULL; bucket = bucket->dthb_next) {
+		if (DTRACE_HASHEQ(hash, bucket->dthb_chain, new))
+			goto add;
+	}
+
+	if ((hash->dth_nbuckets >> 1) > hash->dth_size) {
+		dtrace_hash_resize(hash);
+		dtrace_hash_add(hash, new);
+		return;
+	}
+
+	bucket = kmem_zalloc(sizeof (dtrace_hashbucket_t), KM_SLEEP);
+	bucket->dthb_next = hash->dth_tab[ndx];
+	hash->dth_tab[ndx] = bucket;
+	hash->dth_nbuckets++;
+
+add:
+	nextp = DTRACE_HASHNEXT(hash, new);
+	ASSERT(*nextp == NULL && *(DTRACE_HASHPREV(hash, new)) == NULL);
+	*nextp = bucket->dthb_chain;
+
+	if (bucket->dthb_chain != NULL) {
+		prevp = DTRACE_HASHPREV(hash, bucket->dthb_chain);
+		ASSERT(*prevp == NULL);
+		*prevp = new;
+	}
+
+	bucket->dthb_chain = new;
+	bucket->dthb_len++;
+}
+
+static dtrace_probe_t *
+dtrace_hash_lookup(dtrace_hash_t *hash, dtrace_probe_t *template)
+{
+	int hashval = DTRACE_HASHSTR(hash, template);
+	int ndx = hashval & hash->dth_mask;
+	dtrace_hashbucket_t *bucket = hash->dth_tab[ndx];
+
+	for (; bucket != NULL; bucket = bucket->dthb_next) {
+		if (DTRACE_HASHEQ(hash, bucket->dthb_chain, template))
+			return (bucket->dthb_chain);
+	}
+
+	return (NULL);
+}
+
+static int
+dtrace_hash_collisions(dtrace_hash_t *hash, dtrace_probe_t *template)
+{
+	int hashval = DTRACE_HASHSTR(hash, template);
+	int ndx = hashval & hash->dth_mask;
+	dtrace_hashbucket_t *bucket = hash->dth_tab[ndx];
+
+	for (; bucket != NULL; bucket = bucket->dthb_next) {
+		if (DTRACE_HASHEQ(hash, bucket->dthb_chain, template))
+			return (bucket->dthb_len);
+	}
+
+	return (NULL);
+}
+
+static void
+dtrace_hash_remove(dtrace_hash_t *hash, dtrace_probe_t *probe)
+{
+	int ndx = DTRACE_HASHSTR(hash, probe) & hash->dth_mask;
+	dtrace_hashbucket_t *bucket = hash->dth_tab[ndx];
+
+	dtrace_probe_t **prevp = DTRACE_HASHPREV(hash, probe);
+	dtrace_probe_t **nextp = DTRACE_HASHNEXT(hash, probe);
+
+	/*
+	 * Find the bucket that we're removing this probe from.
+	 */
+	for (; bucket != NULL; bucket = bucket->dthb_next) {
+		if (DTRACE_HASHEQ(hash, bucket->dthb_chain, probe))
+			break;
+	}
+
+	ASSERT(bucket != NULL);
+
+	if (*prevp == NULL) {
+		if (*nextp == NULL) {
+			/*
+			 * The removed probe was the only probe on this
+			 * bucket; we need to remove the bucket.
+			 */
+			dtrace_hashbucket_t *b = hash->dth_tab[ndx];
+
+			ASSERT(bucket->dthb_chain == probe);
+			ASSERT(b != NULL);
+
+			if (b == bucket) {
+				hash->dth_tab[ndx] = bucket->dthb_next;
+			} else {
+				while (b->dthb_next != bucket)
+					b = b->dthb_next;
+				b->dthb_next = bucket->dthb_next;
+			}
+
+			ASSERT(hash->dth_nbuckets > 0);
+			hash->dth_nbuckets--;
+			kmem_free(bucket, sizeof (dtrace_hashbucket_t));
+			return;
+		}
+
+		bucket->dthb_chain = *nextp;
+	} else {
+		*(DTRACE_HASHNEXT(hash, *prevp)) = *nextp;
+	}
+
+	if (*nextp != NULL)
+		*(DTRACE_HASHPREV(hash, *nextp)) = *prevp;
+}
+
+/*
+ * DTrace Utility Functions
+ *
+ * These are random utility functions that are _not_ called from probe context.
+ */
+static int
+dtrace_badattr(const dtrace_attribute_t *a)
+{
+	return (a->dtat_name > DTRACE_STABILITY_MAX ||
+	    a->dtat_data > DTRACE_STABILITY_MAX ||
+	    a->dtat_class > DTRACE_CLASS_MAX);
+}
+
+/*
+ * Return a duplicate copy of a string.  If the specified string is NULL,
+ * this function returns a zero-length string.
+ */
+static char *
+dtrace_strdup(const char *str)
+{
+	char *new = kmem_zalloc((str != NULL ? strlen(str) : 0) + 1, KM_SLEEP);
+
+	if (str != NULL)
+		(void) strcpy(new, str);
+
+	return (new);
+}
+
+#define	DTRACE_ISALPHA(c)	\
+	(((c) >= 'a' && (c) <= 'z') || ((c) >= 'A' && (c) <= 'Z'))
+
+static int
+dtrace_badname(const char *s)
+{
+	char c;
+
+	if (s == NULL || (c = *s++) == '\0')
+		return (0);
+
+	if (!DTRACE_ISALPHA(c) && c != '-' && c != '_' && c != '.')
+		return (1);
+
+	while ((c = *s++) != '\0') {
+		if (!DTRACE_ISALPHA(c) && (c < '0' || c > '9') &&
+		    c != '-' && c != '_' && c != '.' && c != '`')
+			return (1);
+	}
+
+	return (0);
+}
+
+static void
+dtrace_cred2priv(cred_t *cr, uint32_t *privp, uid_t *uidp, zoneid_t *zoneidp)
+{
+	uint32_t priv;
+
+	if (cr == NULL || PRIV_POLICY_ONLY(cr, PRIV_ALL, B_FALSE)) {
+		/*
+		 * For DTRACE_PRIV_ALL, the uid and zoneid don't matter.
+		 */
+		priv = DTRACE_PRIV_ALL;
+	} else {
+		*uidp = crgetuid(cr);
+		*zoneidp = crgetzoneid(cr);
+
+		priv = 0;
+		if (PRIV_POLICY_ONLY(cr, PRIV_DTRACE_KERNEL, B_FALSE))
+			priv |= DTRACE_PRIV_KERNEL | DTRACE_PRIV_USER;
+		else if (PRIV_POLICY_ONLY(cr, PRIV_DTRACE_USER, B_FALSE))
+			priv |= DTRACE_PRIV_USER;
+		if (PRIV_POLICY_ONLY(cr, PRIV_DTRACE_PROC, B_FALSE))
+			priv |= DTRACE_PRIV_PROC;
+		if (PRIV_POLICY_ONLY(cr, PRIV_PROC_OWNER, B_FALSE))
+			priv |= DTRACE_PRIV_OWNER;
+		if (PRIV_POLICY_ONLY(cr, PRIV_PROC_ZONE, B_FALSE))
+			priv |= DTRACE_PRIV_ZONEOWNER;
+	}
+
+	*privp = priv;
+}
+
+#ifdef DTRACE_ERRDEBUG
+static void
+dtrace_errdebug(const char *str)
+{
+	int hval = dtrace_hash_str((char *)str) % DTRACE_ERRHASHSZ;
+	int occupied = 0;
+
+	mutex_enter(&dtrace_errlock);
+	dtrace_errlast = str;
+	dtrace_errthread = curthread;
+
+	while (occupied++ < DTRACE_ERRHASHSZ) {
+		if (dtrace_errhash[hval].dter_msg == str) {
+			dtrace_errhash[hval].dter_count++;
+			goto out;
+		}
+
+		if (dtrace_errhash[hval].dter_msg != NULL) {
+			hval = (hval + 1) % DTRACE_ERRHASHSZ;
+			continue;
+		}
+
+		dtrace_errhash[hval].dter_msg = str;
+		dtrace_errhash[hval].dter_count = 1;
+		goto out;
+	}
+
+	panic("dtrace: undersized error hash");
+out:
+	mutex_exit(&dtrace_errlock);
+}
+#endif
+
+/*
+ * DTrace Matching Functions
+ *
+ * These functions are used to match groups of probes, given some elements of
+ * a probe tuple, or some globbed expressions for elements of a probe tuple.
+ */
+static int
+dtrace_match_priv(const dtrace_probe_t *prp, uint32_t priv, uid_t uid,
+    zoneid_t zoneid)
+{
+	if (priv != DTRACE_PRIV_ALL) {
+		uint32_t ppriv = prp->dtpr_provider->dtpv_priv.dtpp_flags;
+		uint32_t match = priv & ppriv;
+
+		/*
+		 * No PRIV_DTRACE_* privileges...
+		 */
+		if ((priv & (DTRACE_PRIV_PROC | DTRACE_PRIV_USER |
+		    DTRACE_PRIV_KERNEL)) == 0)
+			return (0);
+
+		/*
+		 * No matching bits, but there were bits to match...
+		 */
+		if (match == 0 && ppriv != 0)
+			return (0);
+
+		/*
+		 * Need to have permissions to the process, but don't...
+		 */
+		if (((ppriv & ~match) & DTRACE_PRIV_OWNER) != 0 &&
+		    uid != prp->dtpr_provider->dtpv_priv.dtpp_uid) {
+			return (0);
+		}
+
+		/*
+		 * Need to be in the same zone unless we possess the
+		 * privilege to examine all zones.
+		 */
+		if (((ppriv & ~match) & DTRACE_PRIV_ZONEOWNER) != 0 &&
+		    zoneid != prp->dtpr_provider->dtpv_priv.dtpp_zoneid) {
+			return (0);
+		}
+	}
+
+	return (1);
+}
+
+/*
+ * dtrace_match_probe compares a dtrace_probe_t to a pre-compiled key, which
+ * consists of input pattern strings and an ops-vector to evaluate them.
+ * This function returns >0 for match, 0 for no match, and <0 for error.
+ */
+static int
+dtrace_match_probe(const dtrace_probe_t *prp, const dtrace_probekey_t *pkp,
+    uint32_t priv, uid_t uid, zoneid_t zoneid)
+{
+	dtrace_provider_t *pvp = prp->dtpr_provider;
+	int rv;
+
+	if (pvp->dtpv_defunct)
+		return (0);
+
+	if ((rv = pkp->dtpk_pmatch(pvp->dtpv_name, pkp->dtpk_prov, 0)) <= 0)
+		return (rv);
+
+	if ((rv = pkp->dtpk_mmatch(prp->dtpr_mod, pkp->dtpk_mod, 0)) <= 0)
+		return (rv);
+
+	if ((rv = pkp->dtpk_fmatch(prp->dtpr_func, pkp->dtpk_func, 0)) <= 0)
+		return (rv);
+
+	if ((rv = pkp->dtpk_nmatch(prp->dtpr_name, pkp->dtpk_name, 0)) <= 0)
+		return (rv);
+
+	if (dtrace_match_priv(prp, priv, uid, zoneid) == 0)
+		return (0);
+
+	return (rv);
+}
+
+/*
+ * dtrace_match_glob() is a safe kernel implementation of the gmatch(3GEN)
+ * interface for matching a glob pattern 'p' to an input string 's'.  Unlike
+ * libc's version, the kernel version only applies to 8-bit ASCII strings.
+ * In addition, all of the recursion cases except for '*' matching have been
+ * unwound.  For '*', we still implement recursive evaluation, but a depth
+ * counter is maintained and matching is aborted if we recurse too deep.
+ * The function returns 0 if no match, >0 if match, and <0 if recursion error.
+ */
+static int
+dtrace_match_glob(const char *s, const char *p, int depth)
+{
+	const char *olds;
+	char s1, c;
+	int gs;
+
+	if (depth > DTRACE_PROBEKEY_MAXDEPTH)
+		return (-1);
+
+	if (s == NULL)
+		s = ""; /* treat NULL as empty string */
+
+top:
+	olds = s;
+	s1 = *s++;
+
+	if (p == NULL)
+		return (0);
+
+	if ((c = *p++) == '\0')
+		return (s1 == '\0');
+
+	switch (c) {
+	case '[': {
+		int ok = 0, notflag = 0;
+		char lc = '\0';
+
+		if (s1 == '\0')
+			return (0);
+
+		if (*p == '!') {
+			notflag = 1;
+			p++;
+		}
+
+		if ((c = *p++) == '\0')
+			return (0);
+
+		do {
+			if (c == '-' && lc != '\0' && *p != ']') {
+				if ((c = *p++) == '\0')
+					return (0);
+				if (c == '\\' && (c = *p++) == '\0')
+					return (0);
+
+				if (notflag) {
+					if (s1 < lc || s1 > c)
+						ok++;
+					else
+						return (0);
+				} else if (lc <= s1 && s1 <= c)
+					ok++;
+
+			} else if (c == '\\' && (c = *p++) == '\0')
+				return (0);
+
+			lc = c; /* save left-hand 'c' for next iteration */
+
+			if (notflag) {
+				if (s1 != c)
+					ok++;
+				else
+					return (0);
+			} else if (s1 == c)
+				ok++;
+
+			if ((c = *p++) == '\0')
+				return (0);
+
+		} while (c != ']');
+
+		if (ok)
+			goto top;
+
+		return (0);
+	}
+
+	case '\\':
+		if ((c = *p++) == '\0')
+			return (0);
+		/*FALLTHRU*/
+
+	default:
+		if (c != s1)
+			return (0);
+		/*FALLTHRU*/
+
+	case '?':
+		if (s1 != '\0')
+			goto top;
+		return (0);
+
+	case '*':
+		while (*p == '*')
+			p++; /* consecutive *'s are identical to a single one */
+
+		if (*p == '\0')
+			return (1);
+
+		for (s = olds; *s != '\0'; s++) {
+			if ((gs = dtrace_match_glob(s, p, depth + 1)) != 0)
+				return (gs);
+		}
+
+		return (0);
+	}
+}
+
+/*ARGSUSED*/
+static int
+dtrace_match_string(const char *s, const char *p, int depth)
+{
+	return (s != NULL && strcmp(s, p) == 0);
+}
+
+/*ARGSUSED*/
+static int
+dtrace_match_nul(const char *s, const char *p, int depth)
+{
+	return (1); /* always match the empty pattern */
+}
+
+/*ARGSUSED*/
+static int
+dtrace_match_nonzero(const char *s, const char *p, int depth)
+{
+	return (s != NULL && s[0] != '\0');
+}
+
+static int
+dtrace_match(const dtrace_probekey_t *pkp, uint32_t priv, uid_t uid,
+    zoneid_t zoneid, int (*matched)(dtrace_probe_t *, void *), void *arg)
+{
+	dtrace_probe_t template, *probe;
+	dtrace_hash_t *hash = NULL;
+	int len, best = INT_MAX, nmatched = 0;
+	dtrace_id_t i;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+
+	/*
+	 * If the probe ID is specified in the key, just lookup by ID and
+	 * invoke the match callback once if a matching probe is found.
+	 */
+	if (pkp->dtpk_id != DTRACE_IDNONE) {
+		if ((probe = dtrace_probe_lookup_id(pkp->dtpk_id)) != NULL &&
+		    dtrace_match_probe(probe, pkp, priv, uid, zoneid) > 0) {
+			(void) (*matched)(probe, arg);
+			nmatched++;
+		}
+		return (nmatched);
+	}
+
+	template.dtpr_mod = (char *)pkp->dtpk_mod;
+	template.dtpr_func = (char *)pkp->dtpk_func;
+	template.dtpr_name = (char *)pkp->dtpk_name;
+
+	/*
+	 * We want to find the most distinct of the module name, function
+	 * name, and name.  So for each one that is not a glob pattern or
+	 * empty string, we perform a lookup in the corresponding hash and
+	 * use the hash table with the fewest collisions to do our search.
+	 */
+	if (pkp->dtpk_mmatch == &dtrace_match_string &&
+	    (len = dtrace_hash_collisions(dtrace_bymod, &template)) < best) {
+		best = len;
+		hash = dtrace_bymod;
+	}
+
+	if (pkp->dtpk_fmatch == &dtrace_match_string &&
+	    (len = dtrace_hash_collisions(dtrace_byfunc, &template)) < best) {
+		best = len;
+		hash = dtrace_byfunc;
+	}
+
+	if (pkp->dtpk_nmatch == &dtrace_match_string &&
+	    (len = dtrace_hash_collisions(dtrace_byname, &template)) < best) {
+		best = len;
+		hash = dtrace_byname;
+	}
+
+	/*
+	 * If we did not select a hash table, iterate over every probe and
+	 * invoke our callback for each one that matches our input probe key.
+	 */
+	if (hash == NULL) {
+		for (i = 0; i < dtrace_nprobes; i++) {
+			if ((probe = dtrace_probes[i]) == NULL ||
+			    dtrace_match_probe(probe, pkp, priv, uid,
+			    zoneid) <= 0)
+				continue;
+
+			nmatched++;
+
+			if ((*matched)(probe, arg) != DTRACE_MATCH_NEXT)
+				break;
+		}
+
+		return (nmatched);
+	}
+
+	/*
+	 * If we selected a hash table, iterate over each probe of the same key
+	 * name and invoke the callback for every probe that matches the other
+	 * attributes of our input probe key.
+	 */
+	for (probe = dtrace_hash_lookup(hash, &template); probe != NULL;
+	    probe = *(DTRACE_HASHNEXT(hash, probe))) {
+
+		if (dtrace_match_probe(probe, pkp, priv, uid, zoneid) <= 0)
+			continue;
+
+		nmatched++;
+
+		if ((*matched)(probe, arg) != DTRACE_MATCH_NEXT)
+			break;
+	}
+
+	return (nmatched);
+}
+
+/*
+ * Return the function pointer dtrace_probecmp() should use to compare the
+ * specified pattern with a string.  For NULL or empty patterns, we select
+ * dtrace_match_nul().  For glob pattern strings, we use dtrace_match_glob().
+ * For non-empty non-glob strings, we use dtrace_match_string().
+ */
+static dtrace_probekey_f *
+dtrace_probekey_func(const char *p)
+{
+	char c;
+
+	if (p == NULL || *p == '\0')
+		return (&dtrace_match_nul);
+
+	while ((c = *p++) != '\0') {
+		if (c == '[' || c == '?' || c == '*' || c == '\\')
+			return (&dtrace_match_glob);
+	}
+
+	return (&dtrace_match_string);
+}
+
+/*
+ * Build a probe comparison key for use with dtrace_match_probe() from the
+ * given probe description.  By convention, a null key only matches anchored
+ * probes: if each field is the empty string, reset dtpk_fmatch to
+ * dtrace_match_nonzero().
+ */
+static void
+dtrace_probekey(const dtrace_probedesc_t *pdp, dtrace_probekey_t *pkp)
+{
+	pkp->dtpk_prov = pdp->dtpd_provider;
+	pkp->dtpk_pmatch = dtrace_probekey_func(pdp->dtpd_provider);
+
+	pkp->dtpk_mod = pdp->dtpd_mod;
+	pkp->dtpk_mmatch = dtrace_probekey_func(pdp->dtpd_mod);
+
+	pkp->dtpk_func = pdp->dtpd_func;
+	pkp->dtpk_fmatch = dtrace_probekey_func(pdp->dtpd_func);
+
+	pkp->dtpk_name = pdp->dtpd_name;
+	pkp->dtpk_nmatch = dtrace_probekey_func(pdp->dtpd_name);
+
+	pkp->dtpk_id = pdp->dtpd_id;
+
+	if (pkp->dtpk_id == DTRACE_IDNONE &&
+	    pkp->dtpk_pmatch == &dtrace_match_nul &&
+	    pkp->dtpk_mmatch == &dtrace_match_nul &&
+	    pkp->dtpk_fmatch == &dtrace_match_nul &&
+	    pkp->dtpk_nmatch == &dtrace_match_nul)
+		pkp->dtpk_fmatch = &dtrace_match_nonzero;
+}
+
+/*
+ * DTrace Provider-to-Framework API Functions
+ *
+ * These functions implement much of the Provider-to-Framework API, as
+ * described in <sys/dtrace.h>.  The parts of the API not in this section are
+ * the functions in the API for probe management (found below), and
+ * dtrace_probe() itself (found above).
+ */
+
+/*
+ * Register the calling provider with the DTrace framework.  This should
+ * generally be called by DTrace providers in their attach(9E) entry point.
+ */
+int
+dtrace_register(const char *name, const dtrace_pattr_t *pap, uint32_t priv,
+    cred_t *cr, const dtrace_pops_t *pops, void *arg, dtrace_provider_id_t *idp)
+{
+	dtrace_provider_t *provider;
+
+	if (name == NULL || pap == NULL || pops == NULL || idp == NULL) {
+		cmn_err(CE_WARN, "failed to register provider '%s': invalid "
+		    "arguments", name ? name : "<NULL>");
+		return (EINVAL);
+	}
+
+	if (name[0] == '\0' || dtrace_badname(name)) {
+		cmn_err(CE_WARN, "failed to register provider '%s': invalid "
+		    "provider name", name);
+		return (EINVAL);
+	}
+
+	if ((pops->dtps_provide == NULL && pops->dtps_provide_module == NULL) ||
+	    pops->dtps_enable == NULL || pops->dtps_disable == NULL ||
+	    pops->dtps_destroy == NULL ||
+	    ((pops->dtps_resume == NULL) != (pops->dtps_suspend == NULL))) {
+		cmn_err(CE_WARN, "failed to register provider '%s': invalid "
+		    "provider ops", name);
+		return (EINVAL);
+	}
+
+	if (dtrace_badattr(&pap->dtpa_provider) ||
+	    dtrace_badattr(&pap->dtpa_mod) ||
+	    dtrace_badattr(&pap->dtpa_func) ||
+	    dtrace_badattr(&pap->dtpa_name) ||
+	    dtrace_badattr(&pap->dtpa_args)) {
+		cmn_err(CE_WARN, "failed to register provider '%s': invalid "
+		    "provider attributes", name);
+		return (EINVAL);
+	}
+
+	if (priv & ~DTRACE_PRIV_ALL) {
+		cmn_err(CE_WARN, "failed to register provider '%s': invalid "
+		    "privilege attributes", name);
+		return (EINVAL);
+	}
+
+	if ((priv & DTRACE_PRIV_KERNEL) &&
+	    (priv & (DTRACE_PRIV_USER | DTRACE_PRIV_OWNER)) &&
+	    pops->dtps_usermode == NULL) {
+		cmn_err(CE_WARN, "failed to register provider '%s': need "
+		    "dtps_usermode() op for given privilege attributes", name);
+		return (EINVAL);
+	}
+
+	provider = kmem_zalloc(sizeof (dtrace_provider_t), KM_SLEEP);
+	provider->dtpv_name = kmem_alloc(strlen(name) + 1, KM_SLEEP);
+	(void) strcpy(provider->dtpv_name, name);
+
+	provider->dtpv_attr = *pap;
+	provider->dtpv_priv.dtpp_flags = priv;
+	if (cr != NULL) {
+		provider->dtpv_priv.dtpp_uid = crgetuid(cr);
+		provider->dtpv_priv.dtpp_zoneid = crgetzoneid(cr);
+	}
+	provider->dtpv_pops = *pops;
+
+	if (pops->dtps_provide == NULL) {
+		ASSERT(pops->dtps_provide_module != NULL);
+		provider->dtpv_pops.dtps_provide =
+		    (void (*)(void *, const dtrace_probedesc_t *))dtrace_nullop;
+	}
+
+	if (pops->dtps_provide_module == NULL) {
+		ASSERT(pops->dtps_provide != NULL);
+		provider->dtpv_pops.dtps_provide_module =
+		    (void (*)(void *, struct modctl *))dtrace_nullop;
+	}
+
+	if (pops->dtps_suspend == NULL) {
+		ASSERT(pops->dtps_resume == NULL);
+		provider->dtpv_pops.dtps_suspend =
+		    (void (*)(void *, dtrace_id_t, void *))dtrace_nullop;
+		provider->dtpv_pops.dtps_resume =
+		    (void (*)(void *, dtrace_id_t, void *))dtrace_nullop;
+	}
+
+	provider->dtpv_arg = arg;
+	*idp = (dtrace_provider_id_t)provider;
+
+	if (pops == &dtrace_provider_ops) {
+		ASSERT(MUTEX_HELD(&dtrace_provider_lock));
+		ASSERT(MUTEX_HELD(&dtrace_lock));
+		ASSERT(dtrace_anon.dta_enabling == NULL);
+
+		/*
+		 * We make sure that the DTrace provider is at the head of
+		 * the provider chain.
+		 */
+		provider->dtpv_next = dtrace_provider;
+		dtrace_provider = provider;
+		return (0);
+	}
+
+	mutex_enter(&dtrace_provider_lock);
+	mutex_enter(&dtrace_lock);
+
+	/*
+	 * If there is at least one provider registered, we'll add this
+	 * provider after the first provider.
+	 */
+	if (dtrace_provider != NULL) {
+		provider->dtpv_next = dtrace_provider->dtpv_next;
+		dtrace_provider->dtpv_next = provider;
+	} else {
+		dtrace_provider = provider;
+	}
+
+	if (dtrace_retained != NULL) {
+		dtrace_enabling_provide(provider);
+
+		/*
+		 * Now we need to call dtrace_enabling_matchall() -- which
+		 * will acquire cpu_lock and dtrace_lock.  We therefore need
+		 * to drop all of our locks before calling into it...
+		 */
+		mutex_exit(&dtrace_lock);
+		mutex_exit(&dtrace_provider_lock);
+		dtrace_enabling_matchall();
+
+		return (0);
+	}
+
+	mutex_exit(&dtrace_lock);
+	mutex_exit(&dtrace_provider_lock);
+
+	return (0);
+}
+
+/*
+ * Unregister the specified provider from the DTrace framework.  This should
+ * generally be called by DTrace providers in their detach(9E) entry point.
+ */
+int
+dtrace_unregister(dtrace_provider_id_t id)
+{
+	dtrace_provider_t *old = (dtrace_provider_t *)id;
+	dtrace_provider_t *prev = NULL;
+	int i, self = 0;
+	dtrace_probe_t *probe, *first = NULL;
+
+	if (old->dtpv_pops.dtps_enable ==
+	    (void (*)(void *, dtrace_id_t, void *))dtrace_nullop) {
+		/*
+		 * If DTrace itself is the provider, we're called with locks
+		 * already held.
+		 */
+		ASSERT(old == dtrace_provider);
+		ASSERT(dtrace_devi != NULL);
+		ASSERT(MUTEX_HELD(&dtrace_provider_lock));
+		ASSERT(MUTEX_HELD(&dtrace_lock));
+		self = 1;
+
+		if (dtrace_provider->dtpv_next != NULL) {
+			/*
+			 * There's another provider here; return failure.
+			 */
+			return (EBUSY);
+		}
+	} else {
+		mutex_enter(&dtrace_provider_lock);
+		mutex_enter(&mod_lock);
+		mutex_enter(&dtrace_lock);
+	}
+
+	/*
+	 * If anyone has /dev/dtrace open, or if there are anonymous enabled
+	 * probes, we refuse to let providers slither away, unless this
+	 * provider has already been explicitly invalidated.
+	 */
+	if (!old->dtpv_defunct &&
+	    (dtrace_opens || (dtrace_anon.dta_state != NULL &&
+	    dtrace_anon.dta_state->dts_necbs > 0))) {
+		if (!self) {
+			mutex_exit(&dtrace_lock);
+			mutex_exit(&mod_lock);
+			mutex_exit(&dtrace_provider_lock);
+		}
+		return (EBUSY);
+	}
+
+	/*
+	 * Attempt to destroy the probes associated with this provider.
+	 */
+	for (i = 0; i < dtrace_nprobes; i++) {
+		if ((probe = dtrace_probes[i]) == NULL)
+			continue;
+
+		if (probe->dtpr_provider != old)
+			continue;
+
+		if (probe->dtpr_ecb == NULL)
+			continue;
+
+		/*
+		 * We have at least one ECB; we can't remove this provider.
+		 */
+		if (!self) {
+			mutex_exit(&dtrace_lock);
+			mutex_exit(&mod_lock);
+			mutex_exit(&dtrace_provider_lock);
+		}
+		return (EBUSY);
+	}
+
+	/*
+	 * All of the probes for this provider are disabled; we can safely
+	 * remove all of them from their hash chains and from the probe array.
+	 */
+	for (i = 0; i < dtrace_nprobes; i++) {
+		if ((probe = dtrace_probes[i]) == NULL)
+			continue;
+
+		if (probe->dtpr_provider != old)
+			continue;
+
+		dtrace_probes[i] = NULL;
+
+		dtrace_hash_remove(dtrace_bymod, probe);
+		dtrace_hash_remove(dtrace_byfunc, probe);
+		dtrace_hash_remove(dtrace_byname, probe);
+
+		if (first == NULL) {
+			first = probe;
+			probe->dtpr_nextmod = NULL;
+		} else {
+			probe->dtpr_nextmod = first;
+			first = probe;
+		}
+	}
+
+	/*
+	 * The provider's probes have been removed from the hash chains and
+	 * from the probe array.  Now issue a dtrace_sync() to be sure that
+	 * everyone has cleared out from any probe array processing.
+	 */
+	dtrace_sync();
+
+	for (probe = first; probe != NULL; probe = first) {
+		first = probe->dtpr_nextmod;
+
+		old->dtpv_pops.dtps_destroy(old->dtpv_arg, probe->dtpr_id,
+		    probe->dtpr_arg);
+		kmem_free(probe->dtpr_mod, strlen(probe->dtpr_mod) + 1);
+		kmem_free(probe->dtpr_func, strlen(probe->dtpr_func) + 1);
+		kmem_free(probe->dtpr_name, strlen(probe->dtpr_name) + 1);
+		vmem_free(dtrace_arena, (void *)(uintptr_t)(probe->dtpr_id), 1);
+		kmem_free(probe, sizeof (dtrace_probe_t));
+	}
+
+	if ((prev = dtrace_provider) == old) {
+		ASSERT(self || dtrace_devi == NULL);
+		ASSERT(old->dtpv_next == NULL || dtrace_devi == NULL);
+		dtrace_provider = old->dtpv_next;
+	} else {
+		while (prev != NULL && prev->dtpv_next != old)
+			prev = prev->dtpv_next;
+
+		if (prev == NULL) {
+			panic("attempt to unregister non-existent "
+			    "dtrace provider %p\n", (void *)id);
+		}
+
+		prev->dtpv_next = old->dtpv_next;
+	}
+
+	if (!self) {
+		mutex_exit(&dtrace_lock);
+		mutex_exit(&mod_lock);
+		mutex_exit(&dtrace_provider_lock);
+	}
+
+	kmem_free(old->dtpv_name, strlen(old->dtpv_name) + 1);
+	kmem_free(old, sizeof (dtrace_provider_t));
+
+	return (0);
+}
+
+/*
+ * Invalidate the specified provider.  All subsequent probe lookups for the
+ * specified provider will fail, but its probes will not be removed.
+ */
+void
+dtrace_invalidate(dtrace_provider_id_t id)
+{
+	dtrace_provider_t *pvp = (dtrace_provider_t *)id;
+
+	ASSERT(pvp->dtpv_pops.dtps_enable !=
+	    (void (*)(void *, dtrace_id_t, void *))dtrace_nullop);
+
+	mutex_enter(&dtrace_provider_lock);
+	mutex_enter(&dtrace_lock);
+
+	pvp->dtpv_defunct = 1;
+
+	mutex_exit(&dtrace_lock);
+	mutex_exit(&dtrace_provider_lock);
+}
+
+/*
+ * Indicate whether or not DTrace has attached.
+ */
+int
+dtrace_attached(void)
+{
+	/*
+	 * dtrace_provider will be non-NULL iff the DTrace driver has
+	 * attached.  (It's non-NULL because DTrace is always itself a
+	 * provider.)
+	 */
+	return (dtrace_provider != NULL);
+}
+
+/*
+ * Remove all the unenabled probes for the given provider.  This function is
+ * not unlike dtrace_unregister(), except that it doesn't remove the provider
+ * -- just as many of its associated probes as it can.
+ */
+int
+dtrace_condense(dtrace_provider_id_t id)
+{
+	dtrace_provider_t *prov = (dtrace_provider_t *)id;
+	int i;
+	dtrace_probe_t *probe;
+
+	/*
+	 * Make sure this isn't the dtrace provider itself.
+	 */
+	ASSERT(prov->dtpv_pops.dtps_enable !=
+	    (void (*)(void *, dtrace_id_t, void *))dtrace_nullop);
+
+	mutex_enter(&dtrace_provider_lock);
+	mutex_enter(&dtrace_lock);
+
+	/*
+	 * Attempt to destroy the probes associated with this provider.
+	 */
+	for (i = 0; i < dtrace_nprobes; i++) {
+		if ((probe = dtrace_probes[i]) == NULL)
+			continue;
+
+		if (probe->dtpr_provider != prov)
+			continue;
+
+		if (probe->dtpr_ecb != NULL)
+			continue;
+
+		dtrace_probes[i] = NULL;
+
+		dtrace_hash_remove(dtrace_bymod, probe);
+		dtrace_hash_remove(dtrace_byfunc, probe);
+		dtrace_hash_remove(dtrace_byname, probe);
+
+		prov->dtpv_pops.dtps_destroy(prov->dtpv_arg, i + 1,
+		    probe->dtpr_arg);
+		kmem_free(probe->dtpr_mod, strlen(probe->dtpr_mod) + 1);
+		kmem_free(probe->dtpr_func, strlen(probe->dtpr_func) + 1);
+		kmem_free(probe->dtpr_name, strlen(probe->dtpr_name) + 1);
+		kmem_free(probe, sizeof (dtrace_probe_t));
+		vmem_free(dtrace_arena, (void *)((uintptr_t)i + 1), 1);
+	}
+
+	mutex_exit(&dtrace_lock);
+	mutex_exit(&dtrace_provider_lock);
+
+	return (0);
+}
+
+/*
+ * DTrace Probe Management Functions
+ *
+ * The functions in this section perform the DTrace probe management,
+ * including functions to create probes, look-up probes, and call into the
+ * providers to request that probes be provided.  Some of these functions are
+ * in the Provider-to-Framework API; these functions can be identified by the
+ * fact that they are not declared "static".
+ */
+
+/*
+ * Create a probe with the specified module name, function name, and name.
+ */
+dtrace_id_t
+dtrace_probe_create(dtrace_provider_id_t prov, const char *mod,
+    const char *func, const char *name, int aframes, void *arg)
+{
+	dtrace_probe_t *probe, **probes;
+	dtrace_provider_t *provider = (dtrace_provider_t *)prov;
+	dtrace_id_t id;
+
+	if (provider == dtrace_provider) {
+		ASSERT(MUTEX_HELD(&dtrace_lock));
+	} else {
+		mutex_enter(&dtrace_lock);
+	}
+
+	id = (dtrace_id_t)(uintptr_t)vmem_alloc(dtrace_arena, 1,
+	    VM_BESTFIT | VM_SLEEP);
+	probe = kmem_zalloc(sizeof (dtrace_probe_t), KM_SLEEP);
+
+	probe->dtpr_id = id;
+	probe->dtpr_gen = dtrace_probegen++;
+	probe->dtpr_mod = dtrace_strdup(mod);
+	probe->dtpr_func = dtrace_strdup(func);
+	probe->dtpr_name = dtrace_strdup(name);
+	probe->dtpr_arg = arg;
+	probe->dtpr_aframes = aframes;
+	probe->dtpr_provider = provider;
+
+	dtrace_hash_add(dtrace_bymod, probe);
+	dtrace_hash_add(dtrace_byfunc, probe);
+	dtrace_hash_add(dtrace_byname, probe);
+
+	if (id - 1 >= dtrace_nprobes) {
+		size_t osize = dtrace_nprobes * sizeof (dtrace_probe_t *);
+		size_t nsize = osize << 1;
+
+		if (nsize == 0) {
+			ASSERT(osize == 0);
+			ASSERT(dtrace_probes == NULL);
+			nsize = sizeof (dtrace_probe_t *);
+		}
+
+		probes = kmem_zalloc(nsize, KM_SLEEP);
+
+		if (dtrace_probes == NULL) {
+			ASSERT(osize == 0);
+			dtrace_probes = probes;
+			dtrace_nprobes = 1;
+		} else {
+			dtrace_probe_t **oprobes = dtrace_probes;
+
+			bcopy(oprobes, probes, osize);
+			dtrace_membar_producer();
+			dtrace_probes = probes;
+
+			dtrace_sync();
+
+			/*
+			 * All CPUs are now seeing the new probes array; we can
+			 * safely free the old array.
+			 */
+			kmem_free(oprobes, osize);
+			dtrace_nprobes <<= 1;
+		}
+
+		ASSERT(id - 1 < dtrace_nprobes);
+	}
+
+	ASSERT(dtrace_probes[id - 1] == NULL);
+	dtrace_probes[id - 1] = probe;
+
+	if (provider != dtrace_provider)
+		mutex_exit(&dtrace_lock);
+
+	return (id);
+}
+
+static dtrace_probe_t *
+dtrace_probe_lookup_id(dtrace_id_t id)
+{
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+
+	if (id == 0 || id > dtrace_nprobes)
+		return (NULL);
+
+	return (dtrace_probes[id - 1]);
+}
+
+static int
+dtrace_probe_lookup_match(dtrace_probe_t *probe, void *arg)
+{
+	*((dtrace_id_t *)arg) = probe->dtpr_id;
+
+	return (DTRACE_MATCH_DONE);
+}
+
+/*
+ * Look up a probe based on provider and one or more of module name, function
+ * name and probe name.
+ */
+dtrace_id_t
+dtrace_probe_lookup(dtrace_provider_id_t prid, const char *mod,
+    const char *func, const char *name)
+{
+	dtrace_probekey_t pkey;
+	dtrace_id_t id;
+	int match;
+
+	pkey.dtpk_prov = ((dtrace_provider_t *)prid)->dtpv_name;
+	pkey.dtpk_pmatch = &dtrace_match_string;
+	pkey.dtpk_mod = mod;
+	pkey.dtpk_mmatch = mod ? &dtrace_match_string : &dtrace_match_nul;
+	pkey.dtpk_func = func;
+	pkey.dtpk_fmatch = func ? &dtrace_match_string : &dtrace_match_nul;
+	pkey.dtpk_name = name;
+	pkey.dtpk_nmatch = name ? &dtrace_match_string : &dtrace_match_nul;
+	pkey.dtpk_id = DTRACE_IDNONE;
+
+	mutex_enter(&dtrace_lock);
+	match = dtrace_match(&pkey, DTRACE_PRIV_ALL, 0, 0,
+	    dtrace_probe_lookup_match, &id);
+	mutex_exit(&dtrace_lock);
+
+	ASSERT(match == 1 || match == 0);
+	return (match ? id : 0);
+}
+
+/*
+ * Returns the probe argument associated with the specified probe.
+ */
+void *
+dtrace_probe_arg(dtrace_provider_id_t id, dtrace_id_t pid)
+{
+	dtrace_probe_t *probe;
+	void *rval = NULL;
+
+	mutex_enter(&dtrace_lock);
+
+	if ((probe = dtrace_probe_lookup_id(pid)) != NULL &&
+	    probe->dtpr_provider == (dtrace_provider_t *)id)
+		rval = probe->dtpr_arg;
+
+	mutex_exit(&dtrace_lock);
+
+	return (rval);
+}
+
+/*
+ * Copy a probe into a probe description.
+ */
+static void
+dtrace_probe_description(const dtrace_probe_t *prp, dtrace_probedesc_t *pdp)
+{
+	bzero(pdp, sizeof (dtrace_probedesc_t));
+	pdp->dtpd_id = prp->dtpr_id;
+
+	(void) strncpy(pdp->dtpd_provider,
+	    prp->dtpr_provider->dtpv_name, DTRACE_PROVNAMELEN - 1);
+
+	(void) strncpy(pdp->dtpd_mod, prp->dtpr_mod, DTRACE_MODNAMELEN - 1);
+	(void) strncpy(pdp->dtpd_func, prp->dtpr_func, DTRACE_FUNCNAMELEN - 1);
+	(void) strncpy(pdp->dtpd_name, prp->dtpr_name, DTRACE_NAMELEN - 1);
+}
+
+/*
+ * Called to indicate that a probe -- or probes -- should be provided by a
+ * specfied provider.  If the specified description is NULL, the provider will
+ * be told to provide all of its probes.  (This is done whenever a new
+ * consumer comes along, or whenever a retained enabling is to be matched.) If
+ * the specified description is non-NULL, the provider is given the
+ * opportunity to dynamically provide the specified probe, allowing providers
+ * to support the creation of probes on-the-fly.  (So-called _autocreated_
+ * probes.)  If the provider is NULL, the operations will be applied to all
+ * providers; if the provider is non-NULL the operations will only be applied
+ * to the specified provider.  The dtrace_provider_lock must be held, and the
+ * dtrace_lock must _not_ be held -- the provider's dtps_provide() operation
+ * will need to grab the dtrace_lock when it reenters the framework through
+ * dtrace_probe_lookup(), dtrace_probe_create(), etc.
+ */
+static void
+dtrace_probe_provide(dtrace_probedesc_t *desc, dtrace_provider_t *prv)
+{
+	struct modctl *ctl;
+	int all = 0;
+
+	ASSERT(MUTEX_HELD(&dtrace_provider_lock));
+
+	if (prv == NULL) {
+		all = 1;
+		prv = dtrace_provider;
+	}
+
+	do {
+		/*
+		 * First, call the blanket provide operation.
+		 */
+		prv->dtpv_pops.dtps_provide(prv->dtpv_arg, desc);
+
+		/*
+		 * Now call the per-module provide operation.  We will grab
+		 * mod_lock to prevent the list from being modified.  Note
+		 * that this also prevents the mod_busy bits from changing.
+		 * (mod_busy can only be changed with mod_lock held.)
+		 */
+		mutex_enter(&mod_lock);
+
+		ctl = &modules;
+		do {
+			if (ctl->mod_busy || ctl->mod_mp == NULL)
+				continue;
+
+			prv->dtpv_pops.dtps_provide_module(prv->dtpv_arg, ctl);
+
+		} while ((ctl = ctl->mod_next) != &modules);
+
+		mutex_exit(&mod_lock);
+	} while (all && (prv = prv->dtpv_next) != NULL);
+}
+
+/*
+ * Iterate over each probe, and call the Framework-to-Provider API function
+ * denoted by offs.
+ */
+static void
+dtrace_probe_foreach(uintptr_t offs)
+{
+	dtrace_provider_t *prov;
+	void (*func)(void *, dtrace_id_t, void *);
+	dtrace_probe_t *probe;
+	dtrace_icookie_t cookie;
+	int i;
+
+	/*
+	 * We disable interrupts to walk through the probe array.  This is
+	 * safe -- the dtrace_sync() in dtrace_unregister() assures that we
+	 * won't see stale data.
+	 */
+	cookie = dtrace_interrupt_disable();
+
+	for (i = 0; i < dtrace_nprobes; i++) {
+		if ((probe = dtrace_probes[i]) == NULL)
+			continue;
+
+		if (probe->dtpr_ecb == NULL) {
+			/*
+			 * This probe isn't enabled -- don't call the function.
+			 */
+			continue;
+		}
+
+		prov = probe->dtpr_provider;
+		func = *((void(**)(void *, dtrace_id_t, void *))
+		    ((uintptr_t)&prov->dtpv_pops + offs));
+
+		func(prov->dtpv_arg, i + 1, probe->dtpr_arg);
+	}
+
+	dtrace_interrupt_enable(cookie);
+}
+
+static int
+dtrace_probe_enable(const dtrace_probedesc_t *desc, dtrace_enabling_t *enab)
+{
+	dtrace_probekey_t pkey;
+	uint32_t priv;
+	uid_t uid;
+	zoneid_t zoneid;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+	dtrace_ecb_create_cache = NULL;
+
+	if (desc == NULL) {
+		/*
+		 * If we're passed a NULL description, we're being asked to
+		 * create an ECB with a NULL probe.
+		 */
+		(void) dtrace_ecb_create_enable(NULL, enab);
+		return (0);
+	}
+
+	dtrace_probekey(desc, &pkey);
+	dtrace_cred2priv(enab->dten_vstate->dtvs_state->dts_cred.dcr_cred,
+	    &priv, &uid, &zoneid);
+
+	return (dtrace_match(&pkey, priv, uid, zoneid, dtrace_ecb_create_enable,
+	    enab));
+}
+
+/*
+ * DTrace Helper Provider Functions
+ */
+static void
+dtrace_dofattr2attr(dtrace_attribute_t *attr, const dof_attr_t dofattr)
+{
+	attr->dtat_name = DOF_ATTR_NAME(dofattr);
+	attr->dtat_data = DOF_ATTR_DATA(dofattr);
+	attr->dtat_class = DOF_ATTR_CLASS(dofattr);
+}
+
+static void
+dtrace_dofprov2hprov(dtrace_helper_provdesc_t *hprov,
+    const dof_provider_t *dofprov, char *strtab)
+{
+	hprov->dthpv_provname = strtab + dofprov->dofpv_name;
+	dtrace_dofattr2attr(&hprov->dthpv_pattr.dtpa_provider,
+	    dofprov->dofpv_provattr);
+	dtrace_dofattr2attr(&hprov->dthpv_pattr.dtpa_mod,
+	    dofprov->dofpv_modattr);
+	dtrace_dofattr2attr(&hprov->dthpv_pattr.dtpa_func,
+	    dofprov->dofpv_funcattr);
+	dtrace_dofattr2attr(&hprov->dthpv_pattr.dtpa_name,
+	    dofprov->dofpv_nameattr);
+	dtrace_dofattr2attr(&hprov->dthpv_pattr.dtpa_args,
+	    dofprov->dofpv_argsattr);
+}
+
+static void
+dtrace_helper_provide_one(dof_helper_t *dhp, dof_sec_t *sec, pid_t pid)
+{
+	uintptr_t daddr = (uintptr_t)dhp->dofhp_dof;
+	dof_hdr_t *dof = (dof_hdr_t *)daddr;
+	dof_sec_t *str_sec, *prb_sec, *arg_sec, *off_sec, *enoff_sec;
+	dof_provider_t *provider;
+	dof_probe_t *probe;
+	uint32_t *off, *enoff;
+	uint8_t *arg;
+	char *strtab;
+	uint_t i, nprobes;
+	dtrace_helper_provdesc_t dhpv;
+	dtrace_helper_probedesc_t dhpb;
+	dtrace_meta_t *meta = dtrace_meta_pid;
+	dtrace_mops_t *mops = &meta->dtm_mops;
+	void *parg;
+
+	provider = (dof_provider_t *)(uintptr_t)(daddr + sec->dofs_offset);
+	str_sec = (dof_sec_t *)(uintptr_t)(daddr + dof->dofh_secoff +
+	    provider->dofpv_strtab * dof->dofh_secsize);
+	prb_sec = (dof_sec_t *)(uintptr_t)(daddr + dof->dofh_secoff +
+	    provider->dofpv_probes * dof->dofh_secsize);
+	arg_sec = (dof_sec_t *)(uintptr_t)(daddr + dof->dofh_secoff +
+	    provider->dofpv_prargs * dof->dofh_secsize);
+	off_sec = (dof_sec_t *)(uintptr_t)(daddr + dof->dofh_secoff +
+	    provider->dofpv_proffs * dof->dofh_secsize);
+
+	strtab = (char *)(uintptr_t)(daddr + str_sec->dofs_offset);
+	off = (uint32_t *)(uintptr_t)(daddr + off_sec->dofs_offset);
+	arg = (uint8_t *)(uintptr_t)(daddr + arg_sec->dofs_offset);
+	enoff = NULL;
+
+	/*
+	 * See dtrace_helper_provider_validate().
+	 */
+	if (dof->dofh_ident[DOF_ID_VERSION] != DOF_VERSION_1 &&
+	    provider->dofpv_prenoffs != DOF_SECT_NONE) {
+		enoff_sec = (dof_sec_t *)(uintptr_t)(daddr + dof->dofh_secoff +
+		    provider->dofpv_prenoffs * dof->dofh_secsize);
+		enoff = (uint32_t *)(uintptr_t)(daddr + enoff_sec->dofs_offset);
+	}
+
+	nprobes = prb_sec->dofs_size / prb_sec->dofs_entsize;
+
+	/*
+	 * Create the provider.
+	 */
+	dtrace_dofprov2hprov(&dhpv, provider, strtab);
+
+	if ((parg = mops->dtms_provide_pid(meta->dtm_arg, &dhpv, pid)) == NULL)
+		return;
+
+	meta->dtm_count++;
+
+	/*
+	 * Create the probes.
+	 */
+	for (i = 0; i < nprobes; i++) {
+		probe = (dof_probe_t *)(uintptr_t)(daddr +
+		    prb_sec->dofs_offset + i * prb_sec->dofs_entsize);
+
+		dhpb.dthpb_mod = dhp->dofhp_mod;
+		dhpb.dthpb_func = strtab + probe->dofpr_func;
+		dhpb.dthpb_name = strtab + probe->dofpr_name;
+		dhpb.dthpb_base = probe->dofpr_addr;
+		dhpb.dthpb_offs = off + probe->dofpr_offidx;
+		dhpb.dthpb_noffs = probe->dofpr_noffs;
+		if (enoff != NULL) {
+			dhpb.dthpb_enoffs = enoff + probe->dofpr_enoffidx;
+			dhpb.dthpb_nenoffs = probe->dofpr_nenoffs;
+		} else {
+			dhpb.dthpb_enoffs = NULL;
+			dhpb.dthpb_nenoffs = 0;
+		}
+		dhpb.dthpb_args = arg + probe->dofpr_argidx;
+		dhpb.dthpb_nargc = probe->dofpr_nargc;
+		dhpb.dthpb_xargc = probe->dofpr_xargc;
+		dhpb.dthpb_ntypes = strtab + probe->dofpr_nargv;
+		dhpb.dthpb_xtypes = strtab + probe->dofpr_xargv;
+
+		mops->dtms_create_probe(meta->dtm_arg, parg, &dhpb);
+	}
+}
+
+static void
+dtrace_helper_provide(dof_helper_t *dhp, pid_t pid)
+{
+	uintptr_t daddr = (uintptr_t)dhp->dofhp_dof;
+	dof_hdr_t *dof = (dof_hdr_t *)daddr;
+	int i;
+
+	ASSERT(MUTEX_HELD(&dtrace_meta_lock));
+
+	for (i = 0; i < dof->dofh_secnum; i++) {
+		dof_sec_t *sec = (dof_sec_t *)(uintptr_t)(daddr +
+		    dof->dofh_secoff + i * dof->dofh_secsize);
+
+		if (sec->dofs_type != DOF_SECT_PROVIDER)
+			continue;
+
+		dtrace_helper_provide_one(dhp, sec, pid);
+	}
+
+	/*
+	 * We may have just created probes, so we must now rematch against
+	 * any retained enablings.  Note that this call will acquire both
+	 * cpu_lock and dtrace_lock; the fact that we are holding
+	 * dtrace_meta_lock now is what defines the ordering with respect to
+	 * these three locks.
+	 */
+	dtrace_enabling_matchall();
+}
+
+static void
+dtrace_helper_provider_remove_one(dof_helper_t *dhp, dof_sec_t *sec, pid_t pid)
+{
+	uintptr_t daddr = (uintptr_t)dhp->dofhp_dof;
+	dof_hdr_t *dof = (dof_hdr_t *)daddr;
+	dof_sec_t *str_sec;
+	dof_provider_t *provider;
+	char *strtab;
+	dtrace_helper_provdesc_t dhpv;
+	dtrace_meta_t *meta = dtrace_meta_pid;
+	dtrace_mops_t *mops = &meta->dtm_mops;
+
+	provider = (dof_provider_t *)(uintptr_t)(daddr + sec->dofs_offset);
+	str_sec = (dof_sec_t *)(uintptr_t)(daddr + dof->dofh_secoff +
+	    provider->dofpv_strtab * dof->dofh_secsize);
+
+	strtab = (char *)(uintptr_t)(daddr + str_sec->dofs_offset);
+
+	/*
+	 * Create the provider.
+	 */
+	dtrace_dofprov2hprov(&dhpv, provider, strtab);
+
+	mops->dtms_remove_pid(meta->dtm_arg, &dhpv, pid);
+
+	meta->dtm_count--;
+}
+
+static void
+dtrace_helper_provider_remove(dof_helper_t *dhp, pid_t pid)
+{
+	uintptr_t daddr = (uintptr_t)dhp->dofhp_dof;
+	dof_hdr_t *dof = (dof_hdr_t *)daddr;
+	int i;
+
+	ASSERT(MUTEX_HELD(&dtrace_meta_lock));
+
+	for (i = 0; i < dof->dofh_secnum; i++) {
+		dof_sec_t *sec = (dof_sec_t *)(uintptr_t)(daddr +
+		    dof->dofh_secoff + i * dof->dofh_secsize);
+
+		if (sec->dofs_type != DOF_SECT_PROVIDER)
+			continue;
+
+		dtrace_helper_provider_remove_one(dhp, sec, pid);
+	}
+}
+
+/*
+ * DTrace Meta Provider-to-Framework API Functions
+ *
+ * These functions implement the Meta Provider-to-Framework API, as described
+ * in <sys/dtrace.h>.
+ */
+int
+dtrace_meta_register(const char *name, const dtrace_mops_t *mops, void *arg,
+    dtrace_meta_provider_id_t *idp)
+{
+	dtrace_meta_t *meta;
+	dtrace_helpers_t *help, *next;
+	int i;
+
+	*idp = DTRACE_METAPROVNONE;
+
+	/*
+	 * We strictly don't need the name, but we hold onto it for
+	 * debuggability. All hail error queues!
+	 */
+	if (name == NULL) {
+		cmn_err(CE_WARN, "failed to register meta-provider: "
+		    "invalid name");
+		return (EINVAL);
+	}
+
+	if (mops == NULL ||
+	    mops->dtms_create_probe == NULL ||
+	    mops->dtms_provide_pid == NULL ||
+	    mops->dtms_remove_pid == NULL) {
+		cmn_err(CE_WARN, "failed to register meta-register %s: "
+		    "invalid ops", name);
+		return (EINVAL);
+	}
+
+	meta = kmem_zalloc(sizeof (dtrace_meta_t), KM_SLEEP);
+	meta->dtm_mops = *mops;
+	meta->dtm_name = kmem_alloc(strlen(name) + 1, KM_SLEEP);
+	(void) strcpy(meta->dtm_name, name);
+	meta->dtm_arg = arg;
+
+	mutex_enter(&dtrace_meta_lock);
+	mutex_enter(&dtrace_lock);
+
+	if (dtrace_meta_pid != NULL) {
+		mutex_exit(&dtrace_lock);
+		mutex_exit(&dtrace_meta_lock);
+		cmn_err(CE_WARN, "failed to register meta-register %s: "
+		    "user-land meta-provider exists", name);
+		kmem_free(meta->dtm_name, strlen(meta->dtm_name) + 1);
+		kmem_free(meta, sizeof (dtrace_meta_t));
+		return (EINVAL);
+	}
+
+	dtrace_meta_pid = meta;
+	*idp = (dtrace_meta_provider_id_t)meta;
+
+	/*
+	 * If there are providers and probes ready to go, pass them
+	 * off to the new meta provider now.
+	 */
+
+	help = dtrace_deferred_pid;
+	dtrace_deferred_pid = NULL;
+
+	mutex_exit(&dtrace_lock);
+
+	while (help != NULL) {
+		for (i = 0; i < help->dthps_nprovs; i++) {
+			dtrace_helper_provide(&help->dthps_provs[i]->dthp_prov,
+			    help->dthps_pid);
+		}
+
+		next = help->dthps_next;
+		help->dthps_next = NULL;
+		help->dthps_prev = NULL;
+		help->dthps_deferred = 0;
+		help = next;
+	}
+
+	mutex_exit(&dtrace_meta_lock);
+
+	return (0);
+}
+
+int
+dtrace_meta_unregister(dtrace_meta_provider_id_t id)
+{
+	dtrace_meta_t **pp, *old = (dtrace_meta_t *)id;
+
+	mutex_enter(&dtrace_meta_lock);
+	mutex_enter(&dtrace_lock);
+
+	if (old == dtrace_meta_pid) {
+		pp = &dtrace_meta_pid;
+	} else {
+		panic("attempt to unregister non-existent "
+		    "dtrace meta-provider %p\n", (void *)old);
+	}
+
+	if (old->dtm_count != 0) {
+		mutex_exit(&dtrace_lock);
+		mutex_exit(&dtrace_meta_lock);
+		return (EBUSY);
+	}
+
+	*pp = NULL;
+
+	mutex_exit(&dtrace_lock);
+	mutex_exit(&dtrace_meta_lock);
+
+	kmem_free(old->dtm_name, strlen(old->dtm_name) + 1);
+	kmem_free(old, sizeof (dtrace_meta_t));
+
+	return (0);
+}
+
+
+/*
+ * DTrace DIF Object Functions
+ */
+static int
+dtrace_difo_err(uint_t pc, const char *format, ...)
+{
+	if (dtrace_err_verbose) {
+		va_list alist;
+
+		(void) uprintf("dtrace DIF object error: [%u]: ", pc);
+		va_start(alist, format);
+		(void) vuprintf(format, alist);
+		va_end(alist);
+	}
+
+#ifdef DTRACE_ERRDEBUG
+	dtrace_errdebug(format);
+#endif
+	return (1);
+}
+
+/*
+ * Validate a DTrace DIF object by checking the IR instructions.  The following
+ * rules are currently enforced by dtrace_difo_validate():
+ *
+ * 1. Each instruction must have a valid opcode
+ * 2. Each register, string, variable, or subroutine reference must be valid
+ * 3. No instruction can modify register %r0 (must be zero)
+ * 4. All instruction reserved bits must be set to zero
+ * 5. The last instruction must be a "ret" instruction
+ * 6. All branch targets must reference a valid instruction _after_ the branch
+ */
+static int
+dtrace_difo_validate(dtrace_difo_t *dp, dtrace_vstate_t *vstate, uint_t nregs,
+    cred_t *cr)
+{
+	int err = 0, i;
+	int (*efunc)(uint_t pc, const char *, ...) = dtrace_difo_err;
+	int kcheckload;
+	uint_t pc;
+
+	kcheckload = cr == NULL ||
+	    (vstate->dtvs_state->dts_cred.dcr_visible & DTRACE_CRV_KERNEL) == 0;
+
+	dp->dtdo_destructive = 0;
+
+	for (pc = 0; pc < dp->dtdo_len && err == 0; pc++) {
+		dif_instr_t instr = dp->dtdo_buf[pc];
+
+		uint_t r1 = DIF_INSTR_R1(instr);
+		uint_t r2 = DIF_INSTR_R2(instr);
+		uint_t rd = DIF_INSTR_RD(instr);
+		uint_t rs = DIF_INSTR_RS(instr);
+		uint_t label = DIF_INSTR_LABEL(instr);
+		uint_t v = DIF_INSTR_VAR(instr);
+		uint_t subr = DIF_INSTR_SUBR(instr);
+		uint_t type = DIF_INSTR_TYPE(instr);
+		uint_t op = DIF_INSTR_OP(instr);
+
+		switch (op) {
+		case DIF_OP_OR:
+		case DIF_OP_XOR:
+		case DIF_OP_AND:
+		case DIF_OP_SLL:
+		case DIF_OP_SRL:
+		case DIF_OP_SRA:
+		case DIF_OP_SUB:
+		case DIF_OP_ADD:
+		case DIF_OP_MUL:
+		case DIF_OP_SDIV:
+		case DIF_OP_UDIV:
+		case DIF_OP_SREM:
+		case DIF_OP_UREM:
+		case DIF_OP_COPYS:
+			if (r1 >= nregs)
+				err += efunc(pc, "invalid register %u\n", r1);
+			if (r2 >= nregs)
+				err += efunc(pc, "invalid register %u\n", r2);
+			if (rd >= nregs)
+				err += efunc(pc, "invalid register %u\n", rd);
+			if (rd == 0)
+				err += efunc(pc, "cannot write to %r0\n");
+			break;
+		case DIF_OP_NOT:
+		case DIF_OP_MOV:
+		case DIF_OP_ALLOCS:
+			if (r1 >= nregs)
+				err += efunc(pc, "invalid register %u\n", r1);
+			if (r2 != 0)
+				err += efunc(pc, "non-zero reserved bits\n");
+			if (rd >= nregs)
+				err += efunc(pc, "invalid register %u\n", rd);
+			if (rd == 0)
+				err += efunc(pc, "cannot write to %r0\n");
+			break;
+		case DIF_OP_LDSB:
+		case DIF_OP_LDSH:
+		case DIF_OP_LDSW:
+		case DIF_OP_LDUB:
+		case DIF_OP_LDUH:
+		case DIF_OP_LDUW:
+		case DIF_OP_LDX:
+			if (r1 >= nregs)
+				err += efunc(pc, "invalid register %u\n", r1);
+			if (r2 != 0)
+				err += efunc(pc, "non-zero reserved bits\n");
+			if (rd >= nregs)
+				err += efunc(pc, "invalid register %u\n", rd);
+			if (rd == 0)
+				err += efunc(pc, "cannot write to %r0\n");
+			if (kcheckload)
+				dp->dtdo_buf[pc] = DIF_INSTR_LOAD(op +
+				    DIF_OP_RLDSB - DIF_OP_LDSB, r1, rd);
+			break;
+		case DIF_OP_RLDSB:
+		case DIF_OP_RLDSH:
+		case DIF_OP_RLDSW:
+		case DIF_OP_RLDUB:
+		case DIF_OP_RLDUH:
+		case DIF_OP_RLDUW:
+		case DIF_OP_RLDX:
+			if (r1 >= nregs)
+				err += efunc(pc, "invalid register %u\n", r1);
+			if (r2 != 0)
+				err += efunc(pc, "non-zero reserved bits\n");
+			if (rd >= nregs)
+				err += efunc(pc, "invalid register %u\n", rd);
+			if (rd == 0)
+				err += efunc(pc, "cannot write to %r0\n");
+			break;
+		case DIF_OP_ULDSB:
+		case DIF_OP_ULDSH:
+		case DIF_OP_ULDSW:
+		case DIF_OP_ULDUB:
+		case DIF_OP_ULDUH:
+		case DIF_OP_ULDUW:
+		case DIF_OP_ULDX:
+			if (r1 >= nregs)
+				err += efunc(pc, "invalid register %u\n", r1);
+			if (r2 != 0)
+				err += efunc(pc, "non-zero reserved bits\n");
+			if (rd >= nregs)
+				err += efunc(pc, "invalid register %u\n", rd);
+			if (rd == 0)
+				err += efunc(pc, "cannot write to %r0\n");
+			break;
+		case DIF_OP_STB:
+		case DIF_OP_STH:
+		case DIF_OP_STW:
+		case DIF_OP_STX:
+			if (r1 >= nregs)
+				err += efunc(pc, "invalid register %u\n", r1);
+			if (r2 != 0)
+				err += efunc(pc, "non-zero reserved bits\n");
+			if (rd >= nregs)
+				err += efunc(pc, "invalid register %u\n", rd);
+			if (rd == 0)
+				err += efunc(pc, "cannot write to 0 address\n");
+			break;
+		case DIF_OP_CMP:
+		case DIF_OP_SCMP:
+			if (r1 >= nregs)
+				err += efunc(pc, "invalid register %u\n", r1);
+			if (r2 >= nregs)
+				err += efunc(pc, "invalid register %u\n", r2);
+			if (rd != 0)
+				err += efunc(pc, "non-zero reserved bits\n");
+			break;
+		case DIF_OP_TST:
+			if (r1 >= nregs)
+				err += efunc(pc, "invalid register %u\n", r1);
+			if (r2 != 0 || rd != 0)
+				err += efunc(pc, "non-zero reserved bits\n");
+			break;
+		case DIF_OP_BA:
+		case DIF_OP_BE:
+		case DIF_OP_BNE:
+		case DIF_OP_BG:
+		case DIF_OP_BGU:
+		case DIF_OP_BGE:
+		case DIF_OP_BGEU:
+		case DIF_OP_BL:
+		case DIF_OP_BLU:
+		case DIF_OP_BLE:
+		case DIF_OP_BLEU:
+			if (label >= dp->dtdo_len) {
+				err += efunc(pc, "invalid branch target %u\n",
+				    label);
+			}
+			if (label <= pc) {
+				err += efunc(pc, "backward branch to %u\n",
+				    label);
+			}
+			break;
+		case DIF_OP_RET:
+			if (r1 != 0 || r2 != 0)
+				err += efunc(pc, "non-zero reserved bits\n");
+			if (rd >= nregs)
+				err += efunc(pc, "invalid register %u\n", rd);
+			break;
+		case DIF_OP_NOP:
+		case DIF_OP_POPTS:
+		case DIF_OP_FLUSHTS:
+			if (r1 != 0 || r2 != 0 || rd != 0)
+				err += efunc(pc, "non-zero reserved bits\n");
+			break;
+		case DIF_OP_SETX:
+			if (DIF_INSTR_INTEGER(instr) >= dp->dtdo_intlen) {
+				err += efunc(pc, "invalid integer ref %u\n",
+				    DIF_INSTR_INTEGER(instr));
+			}
+			if (rd >= nregs)
+				err += efunc(pc, "invalid register %u\n", rd);
+			if (rd == 0)
+				err += efunc(pc, "cannot write to %r0\n");
+			break;
+		case DIF_OP_SETS:
+			if (DIF_INSTR_STRING(instr) >= dp->dtdo_strlen) {
+				err += efunc(pc, "invalid string ref %u\n",
+				    DIF_INSTR_STRING(instr));
+			}
+			if (rd >= nregs)
+				err += efunc(pc, "invalid register %u\n", rd);
+			if (rd == 0)
+				err += efunc(pc, "cannot write to %r0\n");
+			break;
+		case DIF_OP_LDGA:
+		case DIF_OP_LDTA:
+			if (r1 > DIF_VAR_ARRAY_MAX)
+				err += efunc(pc, "invalid array %u\n", r1);
+			if (r2 >= nregs)
+				err += efunc(pc, "invalid register %u\n", r2);
+			if (rd >= nregs)
+				err += efunc(pc, "invalid register %u\n", rd);
+			if (rd == 0)
+				err += efunc(pc, "cannot write to %r0\n");
+			break;
+		case DIF_OP_LDGS:
+		case DIF_OP_LDTS:
+		case DIF_OP_LDLS:
+		case DIF_OP_LDGAA:
+		case DIF_OP_LDTAA:
+			if (v < DIF_VAR_OTHER_MIN || v > DIF_VAR_OTHER_MAX)
+				err += efunc(pc, "invalid variable %u\n", v);
+			if (rd >= nregs)
+				err += efunc(pc, "invalid register %u\n", rd);
+			if (rd == 0)
+				err += efunc(pc, "cannot write to %r0\n");
+			break;
+		case DIF_OP_STGS:
+		case DIF_OP_STTS:
+		case DIF_OP_STLS:
+		case DIF_OP_STGAA:
+		case DIF_OP_STTAA:
+			if (v < DIF_VAR_OTHER_UBASE || v > DIF_VAR_OTHER_MAX)
+				err += efunc(pc, "invalid variable %u\n", v);
+			if (rs >= nregs)
+				err += efunc(pc, "invalid register %u\n", rd);
+			break;
+		case DIF_OP_CALL:
+			if (subr > DIF_SUBR_MAX)
+				err += efunc(pc, "invalid subr %u\n", subr);
+			if (rd >= nregs)
+				err += efunc(pc, "invalid register %u\n", rd);
+			if (rd == 0)
+				err += efunc(pc, "cannot write to %r0\n");
+
+			if (subr == DIF_SUBR_COPYOUT ||
+			    subr == DIF_SUBR_COPYOUTSTR) {
+				dp->dtdo_destructive = 1;
+			}
+			break;
+		case DIF_OP_PUSHTR:
+			if (type != DIF_TYPE_STRING && type != DIF_TYPE_CTF)
+				err += efunc(pc, "invalid ref type %u\n", type);
+			if (r2 >= nregs)
+				err += efunc(pc, "invalid register %u\n", r2);
+			if (rs >= nregs)
+				err += efunc(pc, "invalid register %u\n", rs);
+			break;
+		case DIF_OP_PUSHTV:
+			if (type != DIF_TYPE_CTF)
+				err += efunc(pc, "invalid val type %u\n", type);
+			if (r2 >= nregs)
+				err += efunc(pc, "invalid register %u\n", r2);
+			if (rs >= nregs)
+				err += efunc(pc, "invalid register %u\n", rs);
+			break;
+		default:
+			err += efunc(pc, "invalid opcode %u\n",
+			    DIF_INSTR_OP(instr));
+		}
+	}
+
+	if (dp->dtdo_len != 0 &&
+	    DIF_INSTR_OP(dp->dtdo_buf[dp->dtdo_len - 1]) != DIF_OP_RET) {
+		err += efunc(dp->dtdo_len - 1,
+		    "expected 'ret' as last DIF instruction\n");
+	}
+
+	if (!(dp->dtdo_rtype.dtdt_flags & DIF_TF_BYREF)) {
+		/*
+		 * If we're not returning by reference, the size must be either
+		 * 0 or the size of one of the base types.
+		 */
+		switch (dp->dtdo_rtype.dtdt_size) {
+		case 0:
+		case sizeof (uint8_t):
+		case sizeof (uint16_t):
+		case sizeof (uint32_t):
+		case sizeof (uint64_t):
+			break;
+
+		default:
+			err += efunc(dp->dtdo_len - 1, "bad return size");
+		}
+	}
+
+	for (i = 0; i < dp->dtdo_varlen && err == 0; i++) {
+		dtrace_difv_t *v = &dp->dtdo_vartab[i], *existing = NULL;
+		dtrace_diftype_t *vt, *et;
+		uint_t id, ndx;
+
+		if (v->dtdv_scope != DIFV_SCOPE_GLOBAL &&
+		    v->dtdv_scope != DIFV_SCOPE_THREAD &&
+		    v->dtdv_scope != DIFV_SCOPE_LOCAL) {
+			err += efunc(i, "unrecognized variable scope %d\n",
+			    v->dtdv_scope);
+			break;
+		}
+
+		if (v->dtdv_kind != DIFV_KIND_ARRAY &&
+		    v->dtdv_kind != DIFV_KIND_SCALAR) {
+			err += efunc(i, "unrecognized variable type %d\n",
+			    v->dtdv_kind);
+			break;
+		}
+
+		if ((id = v->dtdv_id) > DIF_VARIABLE_MAX) {
+			err += efunc(i, "%d exceeds variable id limit\n", id);
+			break;
+		}
+
+		if (id < DIF_VAR_OTHER_UBASE)
+			continue;
+
+		/*
+		 * For user-defined variables, we need to check that this
+		 * definition is identical to any previous definition that we
+		 * encountered.
+		 */
+		ndx = id - DIF_VAR_OTHER_UBASE;
+
+		switch (v->dtdv_scope) {
+		case DIFV_SCOPE_GLOBAL:
+			if (ndx < vstate->dtvs_nglobals) {
+				dtrace_statvar_t *svar;
+
+				if ((svar = vstate->dtvs_globals[ndx]) != NULL)
+					existing = &svar->dtsv_var;
+			}
+
+			break;
+
+		case DIFV_SCOPE_THREAD:
+			if (ndx < vstate->dtvs_ntlocals)
+				existing = &vstate->dtvs_tlocals[ndx];
+			break;
+
+		case DIFV_SCOPE_LOCAL:
+			if (ndx < vstate->dtvs_nlocals) {
+				dtrace_statvar_t *svar;
+
+				if ((svar = vstate->dtvs_locals[ndx]) != NULL)
+					existing = &svar->dtsv_var;
+			}
+
+			break;
+		}
+
+		vt = &v->dtdv_type;
+
+		if (vt->dtdt_flags & DIF_TF_BYREF) {
+			if (vt->dtdt_size == 0) {
+				err += efunc(i, "zero-sized variable\n");
+				break;
+			}
+
+			if (v->dtdv_scope == DIFV_SCOPE_GLOBAL &&
+			    vt->dtdt_size > dtrace_global_maxsize) {
+				err += efunc(i, "oversized by-ref global\n");
+				break;
+			}
+		}
+
+		if (existing == NULL || existing->dtdv_id == 0)
+			continue;
+
+		ASSERT(existing->dtdv_id == v->dtdv_id);
+		ASSERT(existing->dtdv_scope == v->dtdv_scope);
+
+		if (existing->dtdv_kind != v->dtdv_kind)
+			err += efunc(i, "%d changed variable kind\n", id);
+
+		et = &existing->dtdv_type;
+
+		if (vt->dtdt_flags != et->dtdt_flags) {
+			err += efunc(i, "%d changed variable type flags\n", id);
+			break;
+		}
+
+		if (vt->dtdt_size != 0 && vt->dtdt_size != et->dtdt_size) {
+			err += efunc(i, "%d changed variable type size\n", id);
+			break;
+		}
+	}
+
+	return (err);
+}
+
+/*
+ * Validate a DTrace DIF object that it is to be used as a helper.  Helpers
+ * are much more constrained than normal DIFOs.  Specifically, they may
+ * not:
+ *
+ * 1. Make calls to subroutines other than copyin(), copyinstr() or
+ *    miscellaneous string routines
+ * 2. Access DTrace variables other than the args[] array, and the
+ *    curthread, pid, ppid, tid, execname, zonename, uid and gid variables.
+ * 3. Have thread-local variables.
+ * 4. Have dynamic variables.
+ */
+static int
+dtrace_difo_validate_helper(dtrace_difo_t *dp)
+{
+	int (*efunc)(uint_t pc, const char *, ...) = dtrace_difo_err;
+	int err = 0;
+	uint_t pc;
+
+	for (pc = 0; pc < dp->dtdo_len; pc++) {
+		dif_instr_t instr = dp->dtdo_buf[pc];
+
+		uint_t v = DIF_INSTR_VAR(instr);
+		uint_t subr = DIF_INSTR_SUBR(instr);
+		uint_t op = DIF_INSTR_OP(instr);
+
+		switch (op) {
+		case DIF_OP_OR:
+		case DIF_OP_XOR:
+		case DIF_OP_AND:
+		case DIF_OP_SLL:
+		case DIF_OP_SRL:
+		case DIF_OP_SRA:
+		case DIF_OP_SUB:
+		case DIF_OP_ADD:
+		case DIF_OP_MUL:
+		case DIF_OP_SDIV:
+		case DIF_OP_UDIV:
+		case DIF_OP_SREM:
+		case DIF_OP_UREM:
+		case DIF_OP_COPYS:
+		case DIF_OP_NOT:
+		case DIF_OP_MOV:
+		case DIF_OP_RLDSB:
+		case DIF_OP_RLDSH:
+		case DIF_OP_RLDSW:
+		case DIF_OP_RLDUB:
+		case DIF_OP_RLDUH:
+		case DIF_OP_RLDUW:
+		case DIF_OP_RLDX:
+		case DIF_OP_ULDSB:
+		case DIF_OP_ULDSH:
+		case DIF_OP_ULDSW:
+		case DIF_OP_ULDUB:
+		case DIF_OP_ULDUH:
+		case DIF_OP_ULDUW:
+		case DIF_OP_ULDX:
+		case DIF_OP_STB:
+		case DIF_OP_STH:
+		case DIF_OP_STW:
+		case DIF_OP_STX:
+		case DIF_OP_ALLOCS:
+		case DIF_OP_CMP:
+		case DIF_OP_SCMP:
+		case DIF_OP_TST:
+		case DIF_OP_BA:
+		case DIF_OP_BE:
+		case DIF_OP_BNE:
+		case DIF_OP_BG:
+		case DIF_OP_BGU:
+		case DIF_OP_BGE:
+		case DIF_OP_BGEU:
+		case DIF_OP_BL:
+		case DIF_OP_BLU:
+		case DIF_OP_BLE:
+		case DIF_OP_BLEU:
+		case DIF_OP_RET:
+		case DIF_OP_NOP:
+		case DIF_OP_POPTS:
+		case DIF_OP_FLUSHTS:
+		case DIF_OP_SETX:
+		case DIF_OP_SETS:
+		case DIF_OP_LDGA:
+		case DIF_OP_LDLS:
+		case DIF_OP_STGS:
+		case DIF_OP_STLS:
+		case DIF_OP_PUSHTR:
+		case DIF_OP_PUSHTV:
+			break;
+
+		case DIF_OP_LDGS:
+			if (v >= DIF_VAR_OTHER_UBASE)
+				break;
+
+			if (v >= DIF_VAR_ARG0 && v <= DIF_VAR_ARG9)
+				break;
+
+			if (v == DIF_VAR_CURTHREAD || v == DIF_VAR_PID ||
+			    v == DIF_VAR_PPID || v == DIF_VAR_TID ||
+			    v == DIF_VAR_EXECNAME || v == DIF_VAR_ZONENAME ||
+			    v == DIF_VAR_UID || v == DIF_VAR_GID)
+				break;
+
+			err += efunc(pc, "illegal variable %u\n", v);
+			break;
+
+		case DIF_OP_LDTA:
+		case DIF_OP_LDTS:
+		case DIF_OP_LDGAA:
+		case DIF_OP_LDTAA:
+			err += efunc(pc, "illegal dynamic variable load\n");
+			break;
+
+		case DIF_OP_STTS:
+		case DIF_OP_STGAA:
+		case DIF_OP_STTAA:
+			err += efunc(pc, "illegal dynamic variable store\n");
+			break;
+
+		case DIF_OP_CALL:
+			if (subr == DIF_SUBR_ALLOCA ||
+			    subr == DIF_SUBR_BCOPY ||
+			    subr == DIF_SUBR_COPYIN ||
+			    subr == DIF_SUBR_COPYINTO ||
+			    subr == DIF_SUBR_COPYINSTR ||
+			    subr == DIF_SUBR_INDEX ||
+			    subr == DIF_SUBR_INET_NTOA ||
+			    subr == DIF_SUBR_INET_NTOA6 ||
+			    subr == DIF_SUBR_INET_NTOP ||
+			    subr == DIF_SUBR_LLTOSTR ||
+			    subr == DIF_SUBR_RINDEX ||
+			    subr == DIF_SUBR_STRCHR ||
+			    subr == DIF_SUBR_STRJOIN ||
+			    subr == DIF_SUBR_STRRCHR ||
+			    subr == DIF_SUBR_STRSTR ||
+			    subr == DIF_SUBR_HTONS ||
+			    subr == DIF_SUBR_HTONL ||
+			    subr == DIF_SUBR_HTONLL ||
+			    subr == DIF_SUBR_NTOHS ||
+			    subr == DIF_SUBR_NTOHL ||
+			    subr == DIF_SUBR_NTOHLL)
+				break;
+
+			err += efunc(pc, "invalid subr %u\n", subr);
+			break;
+
+		default:
+			err += efunc(pc, "invalid opcode %u\n",
+			    DIF_INSTR_OP(instr));
+		}
+	}
+
+	return (err);
+}
+
+/*
+ * Returns 1 if the expression in the DIF object can be cached on a per-thread
+ * basis; 0 if not.
+ */
+static int
+dtrace_difo_cacheable(dtrace_difo_t *dp)
+{
+	int i;
+
+	if (dp == NULL)
+		return (0);
+
+	for (i = 0; i < dp->dtdo_varlen; i++) {
+		dtrace_difv_t *v = &dp->dtdo_vartab[i];
+
+		if (v->dtdv_scope != DIFV_SCOPE_GLOBAL)
+			continue;
+
+		switch (v->dtdv_id) {
+		case DIF_VAR_CURTHREAD:
+		case DIF_VAR_PID:
+		case DIF_VAR_TID:
+		case DIF_VAR_EXECNAME:
+		case DIF_VAR_ZONENAME:
+			break;
+
+		default:
+			return (0);
+		}
+	}
+
+	/*
+	 * This DIF object may be cacheable.  Now we need to look for any
+	 * array loading instructions, any memory loading instructions, or
+	 * any stores to thread-local variables.
+	 */
+	for (i = 0; i < dp->dtdo_len; i++) {
+		uint_t op = DIF_INSTR_OP(dp->dtdo_buf[i]);
+
+		if ((op >= DIF_OP_LDSB && op <= DIF_OP_LDX) ||
+		    (op >= DIF_OP_ULDSB && op <= DIF_OP_ULDX) ||
+		    (op >= DIF_OP_RLDSB && op <= DIF_OP_RLDX) ||
+		    op == DIF_OP_LDGA || op == DIF_OP_STTS)
+			return (0);
+	}
+
+	return (1);
+}
+
+static void
+dtrace_difo_hold(dtrace_difo_t *dp)
+{
+	int i;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+
+	dp->dtdo_refcnt++;
+	ASSERT(dp->dtdo_refcnt != 0);
+
+	/*
+	 * We need to check this DIF object for references to the variable
+	 * DIF_VAR_VTIMESTAMP.
+	 */
+	for (i = 0; i < dp->dtdo_varlen; i++) {
+		dtrace_difv_t *v = &dp->dtdo_vartab[i];
+
+		if (v->dtdv_id != DIF_VAR_VTIMESTAMP)
+			continue;
+
+		if (dtrace_vtime_references++ == 0)
+			dtrace_vtime_enable();
+	}
+}
+
+/*
+ * This routine calculates the dynamic variable chunksize for a given DIF
+ * object.  The calculation is not fool-proof, and can probably be tricked by
+ * malicious DIF -- but it works for all compiler-generated DIF.  Because this
+ * calculation is likely imperfect, dtrace_dynvar() is able to gracefully fail
+ * if a dynamic variable size exceeds the chunksize.
+ */
+static void
+dtrace_difo_chunksize(dtrace_difo_t *dp, dtrace_vstate_t *vstate)
+{
+	uint64_t sval;
+	dtrace_key_t tupregs[DIF_DTR_NREGS + 2]; /* +2 for thread and id */
+	const dif_instr_t *text = dp->dtdo_buf;
+	uint_t pc, srd = 0;
+	uint_t ttop = 0;
+	size_t size, ksize;
+	uint_t id, i;
+
+	for (pc = 0; pc < dp->dtdo_len; pc++) {
+		dif_instr_t instr = text[pc];
+		uint_t op = DIF_INSTR_OP(instr);
+		uint_t rd = DIF_INSTR_RD(instr);
+		uint_t r1 = DIF_INSTR_R1(instr);
+		uint_t nkeys = 0;
+		uchar_t scope;
+
+		dtrace_key_t *key = tupregs;
+
+		switch (op) {
+		case DIF_OP_SETX:
+			sval = dp->dtdo_inttab[DIF_INSTR_INTEGER(instr)];
+			srd = rd;
+			continue;
+
+		case DIF_OP_STTS:
+			key = &tupregs[DIF_DTR_NREGS];
+			key[0].dttk_size = 0;
+			key[1].dttk_size = 0;
+			nkeys = 2;
+			scope = DIFV_SCOPE_THREAD;
+			break;
+
+		case DIF_OP_STGAA:
+		case DIF_OP_STTAA:
+			nkeys = ttop;
+
+			if (DIF_INSTR_OP(instr) == DIF_OP_STTAA)
+				key[nkeys++].dttk_size = 0;
+
+			key[nkeys++].dttk_size = 0;
+
+			if (op == DIF_OP_STTAA) {
+				scope = DIFV_SCOPE_THREAD;
+			} else {
+				scope = DIFV_SCOPE_GLOBAL;
+			}
+
+			break;
+
+		case DIF_OP_PUSHTR:
+			if (ttop == DIF_DTR_NREGS)
+				return;
+
+			if ((srd == 0 || sval == 0) && r1 == DIF_TYPE_STRING) {
+				/*
+				 * If the register for the size of the "pushtr"
+				 * is %r0 (or the value is 0) and the type is
+				 * a string, we'll use the system-wide default
+				 * string size.
+				 */
+				tupregs[ttop++].dttk_size =
+				    dtrace_strsize_default;
+			} else {
+				if (srd == 0)
+					return;
+
+				tupregs[ttop++].dttk_size = sval;
+			}
+
+			break;
+
+		case DIF_OP_PUSHTV:
+			if (ttop == DIF_DTR_NREGS)
+				return;
+
+			tupregs[ttop++].dttk_size = 0;
+			break;
+
+		case DIF_OP_FLUSHTS:
+			ttop = 0;
+			break;
+
+		case DIF_OP_POPTS:
+			if (ttop != 0)
+				ttop--;
+			break;
+		}
+
+		sval = 0;
+		srd = 0;
+
+		if (nkeys == 0)
+			continue;
+
+		/*
+		 * We have a dynamic variable allocation; calculate its size.
+		 */
+		for (ksize = 0, i = 0; i < nkeys; i++)
+			ksize += P2ROUNDUP(key[i].dttk_size, sizeof (uint64_t));
+
+		size = sizeof (dtrace_dynvar_t);
+		size += sizeof (dtrace_key_t) * (nkeys - 1);
+		size += ksize;
+
+		/*
+		 * Now we need to determine the size of the stored data.
+		 */
+		id = DIF_INSTR_VAR(instr);
+
+		for (i = 0; i < dp->dtdo_varlen; i++) {
+			dtrace_difv_t *v = &dp->dtdo_vartab[i];
+
+			if (v->dtdv_id == id && v->dtdv_scope == scope) {
+				size += v->dtdv_type.dtdt_size;
+				break;
+			}
+		}
+
+		if (i == dp->dtdo_varlen)
+			return;
+
+		/*
+		 * We have the size.  If this is larger than the chunk size
+		 * for our dynamic variable state, reset the chunk size.
+		 */
+		size = P2ROUNDUP(size, sizeof (uint64_t));
+
+		if (size > vstate->dtvs_dynvars.dtds_chunksize)
+			vstate->dtvs_dynvars.dtds_chunksize = size;
+	}
+}
+
+static void
+dtrace_difo_init(dtrace_difo_t *dp, dtrace_vstate_t *vstate)
+{
+	int i, oldsvars, osz, nsz, otlocals, ntlocals;
+	uint_t id;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+	ASSERT(dp->dtdo_buf != NULL && dp->dtdo_len != 0);
+
+	for (i = 0; i < dp->dtdo_varlen; i++) {
+		dtrace_difv_t *v = &dp->dtdo_vartab[i];
+		dtrace_statvar_t *svar, ***svarp;
+		size_t dsize = 0;
+		uint8_t scope = v->dtdv_scope;
+		int *np;
+
+		if ((id = v->dtdv_id) < DIF_VAR_OTHER_UBASE)
+			continue;
+
+		id -= DIF_VAR_OTHER_UBASE;
+
+		switch (scope) {
+		case DIFV_SCOPE_THREAD:
+			while (id >= (otlocals = vstate->dtvs_ntlocals)) {
+				dtrace_difv_t *tlocals;
+
+				if ((ntlocals = (otlocals << 1)) == 0)
+					ntlocals = 1;
+
+				osz = otlocals * sizeof (dtrace_difv_t);
+				nsz = ntlocals * sizeof (dtrace_difv_t);
+
+				tlocals = kmem_zalloc(nsz, KM_SLEEP);
+
+				if (osz != 0) {
+					bcopy(vstate->dtvs_tlocals,
+					    tlocals, osz);
+					kmem_free(vstate->dtvs_tlocals, osz);
+				}
+
+				vstate->dtvs_tlocals = tlocals;
+				vstate->dtvs_ntlocals = ntlocals;
+			}
+
+			vstate->dtvs_tlocals[id] = *v;
+			continue;
+
+		case DIFV_SCOPE_LOCAL:
+			np = &vstate->dtvs_nlocals;
+			svarp = &vstate->dtvs_locals;
+
+			if (v->dtdv_type.dtdt_flags & DIF_TF_BYREF)
+				dsize = NCPU * (v->dtdv_type.dtdt_size +
+				    sizeof (uint64_t));
+			else
+				dsize = NCPU * sizeof (uint64_t);
+
+			break;
+
+		case DIFV_SCOPE_GLOBAL:
+			np = &vstate->dtvs_nglobals;
+			svarp = &vstate->dtvs_globals;
+
+			if (v->dtdv_type.dtdt_flags & DIF_TF_BYREF)
+				dsize = v->dtdv_type.dtdt_size +
+				    sizeof (uint64_t);
+
+			break;
+
+		default:
+			ASSERT(0);
+		}
+
+		while (id >= (oldsvars = *np)) {
+			dtrace_statvar_t **statics;
+			int newsvars, oldsize, newsize;
+
+			if ((newsvars = (oldsvars << 1)) == 0)
+				newsvars = 1;
+
+			oldsize = oldsvars * sizeof (dtrace_statvar_t *);
+			newsize = newsvars * sizeof (dtrace_statvar_t *);
+
+			statics = kmem_zalloc(newsize, KM_SLEEP);
+
+			if (oldsize != 0) {
+				bcopy(*svarp, statics, oldsize);
+				kmem_free(*svarp, oldsize);
+			}
+
+			*svarp = statics;
+			*np = newsvars;
+		}
+
+		if ((svar = (*svarp)[id]) == NULL) {
+			svar = kmem_zalloc(sizeof (dtrace_statvar_t), KM_SLEEP);
+			svar->dtsv_var = *v;
+
+			if ((svar->dtsv_size = dsize) != 0) {
+				svar->dtsv_data = (uint64_t)(uintptr_t)
+				    kmem_zalloc(dsize, KM_SLEEP);
+			}
+
+			(*svarp)[id] = svar;
+		}
+
+		svar->dtsv_refcnt++;
+	}
+
+	dtrace_difo_chunksize(dp, vstate);
+	dtrace_difo_hold(dp);
+}
+
+static dtrace_difo_t *
+dtrace_difo_duplicate(dtrace_difo_t *dp, dtrace_vstate_t *vstate)
+{
+	dtrace_difo_t *new;
+	size_t sz;
+
+	ASSERT(dp->dtdo_buf != NULL);
+	ASSERT(dp->dtdo_refcnt != 0);
+
+	new = kmem_zalloc(sizeof (dtrace_difo_t), KM_SLEEP);
+
+	ASSERT(dp->dtdo_buf != NULL);
+	sz = dp->dtdo_len * sizeof (dif_instr_t);
+	new->dtdo_buf = kmem_alloc(sz, KM_SLEEP);
+	bcopy(dp->dtdo_buf, new->dtdo_buf, sz);
+	new->dtdo_len = dp->dtdo_len;
+
+	if (dp->dtdo_strtab != NULL) {
+		ASSERT(dp->dtdo_strlen != 0);
+		new->dtdo_strtab = kmem_alloc(dp->dtdo_strlen, KM_SLEEP);
+		bcopy(dp->dtdo_strtab, new->dtdo_strtab, dp->dtdo_strlen);
+		new->dtdo_strlen = dp->dtdo_strlen;
+	}
+
+	if (dp->dtdo_inttab != NULL) {
+		ASSERT(dp->dtdo_intlen != 0);
+		sz = dp->dtdo_intlen * sizeof (uint64_t);
+		new->dtdo_inttab = kmem_alloc(sz, KM_SLEEP);
+		bcopy(dp->dtdo_inttab, new->dtdo_inttab, sz);
+		new->dtdo_intlen = dp->dtdo_intlen;
+	}
+
+	if (dp->dtdo_vartab != NULL) {
+		ASSERT(dp->dtdo_varlen != 0);
+		sz = dp->dtdo_varlen * sizeof (dtrace_difv_t);
+		new->dtdo_vartab = kmem_alloc(sz, KM_SLEEP);
+		bcopy(dp->dtdo_vartab, new->dtdo_vartab, sz);
+		new->dtdo_varlen = dp->dtdo_varlen;
+	}
+
+	dtrace_difo_init(new, vstate);
+	return (new);
+}
+
+static void
+dtrace_difo_destroy(dtrace_difo_t *dp, dtrace_vstate_t *vstate)
+{
+	int i;
+
+	ASSERT(dp->dtdo_refcnt == 0);
+
+	for (i = 0; i < dp->dtdo_varlen; i++) {
+		dtrace_difv_t *v = &dp->dtdo_vartab[i];
+		dtrace_statvar_t *svar, **svarp;
+		uint_t id;
+		uint8_t scope = v->dtdv_scope;
+		int *np;
+
+		switch (scope) {
+		case DIFV_SCOPE_THREAD:
+			continue;
+
+		case DIFV_SCOPE_LOCAL:
+			np = &vstate->dtvs_nlocals;
+			svarp = vstate->dtvs_locals;
+			break;
+
+		case DIFV_SCOPE_GLOBAL:
+			np = &vstate->dtvs_nglobals;
+			svarp = vstate->dtvs_globals;
+			break;
+
+		default:
+			ASSERT(0);
+		}
+
+		if ((id = v->dtdv_id) < DIF_VAR_OTHER_UBASE)
+			continue;
+
+		id -= DIF_VAR_OTHER_UBASE;
+		ASSERT(id < *np);
+
+		svar = svarp[id];
+		ASSERT(svar != NULL);
+		ASSERT(svar->dtsv_refcnt > 0);
+
+		if (--svar->dtsv_refcnt > 0)
+			continue;
+
+		if (svar->dtsv_size != 0) {
+			ASSERT(svar->dtsv_data != NULL);
+			kmem_free((void *)(uintptr_t)svar->dtsv_data,
+			    svar->dtsv_size);
+		}
+
+		kmem_free(svar, sizeof (dtrace_statvar_t));
+		svarp[id] = NULL;
+	}
+
+	kmem_free(dp->dtdo_buf, dp->dtdo_len * sizeof (dif_instr_t));
+	kmem_free(dp->dtdo_inttab, dp->dtdo_intlen * sizeof (uint64_t));
+	kmem_free(dp->dtdo_strtab, dp->dtdo_strlen);
+	kmem_free(dp->dtdo_vartab, dp->dtdo_varlen * sizeof (dtrace_difv_t));
+
+	kmem_free(dp, sizeof (dtrace_difo_t));
+}
+
+static void
+dtrace_difo_release(dtrace_difo_t *dp, dtrace_vstate_t *vstate)
+{
+	int i;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+	ASSERT(dp->dtdo_refcnt != 0);
+
+	for (i = 0; i < dp->dtdo_varlen; i++) {
+		dtrace_difv_t *v = &dp->dtdo_vartab[i];
+
+		if (v->dtdv_id != DIF_VAR_VTIMESTAMP)
+			continue;
+
+		ASSERT(dtrace_vtime_references > 0);
+		if (--dtrace_vtime_references == 0)
+			dtrace_vtime_disable();
+	}
+
+	if (--dp->dtdo_refcnt == 0)
+		dtrace_difo_destroy(dp, vstate);
+}
+
+/*
+ * DTrace Format Functions
+ */
+static uint16_t
+dtrace_format_add(dtrace_state_t *state, char *str)
+{
+	char *fmt, **new;
+	uint16_t ndx, len = strlen(str) + 1;
+
+	fmt = kmem_zalloc(len, KM_SLEEP);
+	bcopy(str, fmt, len);
+
+	for (ndx = 0; ndx < state->dts_nformats; ndx++) {
+		if (state->dts_formats[ndx] == NULL) {
+			state->dts_formats[ndx] = fmt;
+			return (ndx + 1);
+		}
+	}
+
+	if (state->dts_nformats == USHRT_MAX) {
+		/*
+		 * This is only likely if a denial-of-service attack is being
+		 * attempted.  As such, it's okay to fail silently here.
+		 */
+		kmem_free(fmt, len);
+		return (0);
+	}
+
+	/*
+	 * For simplicity, we always resize the formats array to be exactly the
+	 * number of formats.
+	 */
+	ndx = state->dts_nformats++;
+	new = kmem_alloc((ndx + 1) * sizeof (char *), KM_SLEEP);
+
+	if (state->dts_formats != NULL) {
+		ASSERT(ndx != 0);
+		bcopy(state->dts_formats, new, ndx * sizeof (char *));
+		kmem_free(state->dts_formats, ndx * sizeof (char *));
+	}
+
+	state->dts_formats = new;
+	state->dts_formats[ndx] = fmt;
+
+	return (ndx + 1);
+}
+
+static void
+dtrace_format_remove(dtrace_state_t *state, uint16_t format)
+{
+	char *fmt;
+
+	ASSERT(state->dts_formats != NULL);
+	ASSERT(format <= state->dts_nformats);
+	ASSERT(state->dts_formats[format - 1] != NULL);
+
+	fmt = state->dts_formats[format - 1];
+	kmem_free(fmt, strlen(fmt) + 1);
+	state->dts_formats[format - 1] = NULL;
+}
+
+static void
+dtrace_format_destroy(dtrace_state_t *state)
+{
+	int i;
+
+	if (state->dts_nformats == 0) {
+		ASSERT(state->dts_formats == NULL);
+		return;
+	}
+
+	ASSERT(state->dts_formats != NULL);
+
+	for (i = 0; i < state->dts_nformats; i++) {
+		char *fmt = state->dts_formats[i];
+
+		if (fmt == NULL)
+			continue;
+
+		kmem_free(fmt, strlen(fmt) + 1);
+	}
+
+	kmem_free(state->dts_formats, state->dts_nformats * sizeof (char *));
+	state->dts_nformats = 0;
+	state->dts_formats = NULL;
+}
+
+/*
+ * DTrace Predicate Functions
+ */
+static dtrace_predicate_t *
+dtrace_predicate_create(dtrace_difo_t *dp)
+{
+	dtrace_predicate_t *pred;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+	ASSERT(dp->dtdo_refcnt != 0);
+
+	pred = kmem_zalloc(sizeof (dtrace_predicate_t), KM_SLEEP);
+	pred->dtp_difo = dp;
+	pred->dtp_refcnt = 1;
+
+	if (!dtrace_difo_cacheable(dp))
+		return (pred);
+
+	if (dtrace_predcache_id == DTRACE_CACHEIDNONE) {
+		/*
+		 * This is only theoretically possible -- we have had 2^32
+		 * cacheable predicates on this machine.  We cannot allow any
+		 * more predicates to become cacheable:  as unlikely as it is,
+		 * there may be a thread caching a (now stale) predicate cache
+		 * ID. (N.B.: the temptation is being successfully resisted to
+		 * have this cmn_err() "Holy shit -- we executed this code!")
+		 */
+		return (pred);
+	}
+
+	pred->dtp_cacheid = dtrace_predcache_id++;
+
+	return (pred);
+}
+
+static void
+dtrace_predicate_hold(dtrace_predicate_t *pred)
+{
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+	ASSERT(pred->dtp_difo != NULL && pred->dtp_difo->dtdo_refcnt != 0);
+	ASSERT(pred->dtp_refcnt > 0);
+
+	pred->dtp_refcnt++;
+}
+
+static void
+dtrace_predicate_release(dtrace_predicate_t *pred, dtrace_vstate_t *vstate)
+{
+	dtrace_difo_t *dp = pred->dtp_difo;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+	ASSERT(dp != NULL && dp->dtdo_refcnt != 0);
+	ASSERT(pred->dtp_refcnt > 0);
+
+	if (--pred->dtp_refcnt == 0) {
+		dtrace_difo_release(pred->dtp_difo, vstate);
+		kmem_free(pred, sizeof (dtrace_predicate_t));
+	}
+}
+
+/*
+ * DTrace Action Description Functions
+ */
+static dtrace_actdesc_t *
+dtrace_actdesc_create(dtrace_actkind_t kind, uint32_t ntuple,
+    uint64_t uarg, uint64_t arg)
+{
+	dtrace_actdesc_t *act;
+
+	ASSERT(!DTRACEACT_ISPRINTFLIKE(kind) || (arg != NULL &&
+	    arg >= KERNELBASE) || (arg == NULL && kind == DTRACEACT_PRINTA));
+
+	act = kmem_zalloc(sizeof (dtrace_actdesc_t), KM_SLEEP);
+	act->dtad_kind = kind;
+	act->dtad_ntuple = ntuple;
+	act->dtad_uarg = uarg;
+	act->dtad_arg = arg;
+	act->dtad_refcnt = 1;
+
+	return (act);
+}
+
+static void
+dtrace_actdesc_hold(dtrace_actdesc_t *act)
+{
+	ASSERT(act->dtad_refcnt >= 1);
+	act->dtad_refcnt++;
+}
+
+static void
+dtrace_actdesc_release(dtrace_actdesc_t *act, dtrace_vstate_t *vstate)
+{
+	dtrace_actkind_t kind = act->dtad_kind;
+	dtrace_difo_t *dp;
+
+	ASSERT(act->dtad_refcnt >= 1);
+
+	if (--act->dtad_refcnt != 0)
+		return;
+
+	if ((dp = act->dtad_difo) != NULL)
+		dtrace_difo_release(dp, vstate);
+
+	if (DTRACEACT_ISPRINTFLIKE(kind)) {
+		char *str = (char *)(uintptr_t)act->dtad_arg;
+
+		ASSERT((str != NULL && (uintptr_t)str >= KERNELBASE) ||
+		    (str == NULL && act->dtad_kind == DTRACEACT_PRINTA));
+
+		if (str != NULL)
+			kmem_free(str, strlen(str) + 1);
+	}
+
+	kmem_free(act, sizeof (dtrace_actdesc_t));
+}
+
+/*
+ * DTrace ECB Functions
+ */
+static dtrace_ecb_t *
+dtrace_ecb_add(dtrace_state_t *state, dtrace_probe_t *probe)
+{
+	dtrace_ecb_t *ecb;
+	dtrace_epid_t epid;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+
+	ecb = kmem_zalloc(sizeof (dtrace_ecb_t), KM_SLEEP);
+	ecb->dte_predicate = NULL;
+	ecb->dte_probe = probe;
+
+	/*
+	 * The default size is the size of the default action: recording
+	 * the epid.
+	 */
+	ecb->dte_size = ecb->dte_needed = sizeof (dtrace_epid_t);
+	ecb->dte_alignment = sizeof (dtrace_epid_t);
+
+	epid = state->dts_epid++;
+
+	if (epid - 1 >= state->dts_necbs) {
+		dtrace_ecb_t **oecbs = state->dts_ecbs, **ecbs;
+		int necbs = state->dts_necbs << 1;
+
+		ASSERT(epid == state->dts_necbs + 1);
+
+		if (necbs == 0) {
+			ASSERT(oecbs == NULL);
+			necbs = 1;
+		}
+
+		ecbs = kmem_zalloc(necbs * sizeof (*ecbs), KM_SLEEP);
+
+		if (oecbs != NULL)
+			bcopy(oecbs, ecbs, state->dts_necbs * sizeof (*ecbs));
+
+		dtrace_membar_producer();
+		state->dts_ecbs = ecbs;
+
+		if (oecbs != NULL) {
+			/*
+			 * If this state is active, we must dtrace_sync()
+			 * before we can free the old dts_ecbs array:  we're
+			 * coming in hot, and there may be active ring
+			 * buffer processing (which indexes into the dts_ecbs
+			 * array) on another CPU.
+			 */
+			if (state->dts_activity != DTRACE_ACTIVITY_INACTIVE)
+				dtrace_sync();
+
+			kmem_free(oecbs, state->dts_necbs * sizeof (*ecbs));
+		}
+
+		dtrace_membar_producer();
+		state->dts_necbs = necbs;
+	}
+
+	ecb->dte_state = state;
+
+	ASSERT(state->dts_ecbs[epid - 1] == NULL);
+	dtrace_membar_producer();
+	state->dts_ecbs[(ecb->dte_epid = epid) - 1] = ecb;
+
+	return (ecb);
+}
+
+static void
+dtrace_ecb_enable(dtrace_ecb_t *ecb)
+{
+	dtrace_probe_t *probe = ecb->dte_probe;
+
+	ASSERT(MUTEX_HELD(&cpu_lock));
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+	ASSERT(ecb->dte_next == NULL);
+
+	if (probe == NULL) {
+		/*
+		 * This is the NULL probe -- there's nothing to do.
+		 */
+		return;
+	}
+
+	if (probe->dtpr_ecb == NULL) {
+		dtrace_provider_t *prov = probe->dtpr_provider;
+
+		/*
+		 * We're the first ECB on this probe.
+		 */
+		probe->dtpr_ecb = probe->dtpr_ecb_last = ecb;
+
+		if (ecb->dte_predicate != NULL)
+			probe->dtpr_predcache = ecb->dte_predicate->dtp_cacheid;
+
+		prov->dtpv_pops.dtps_enable(prov->dtpv_arg,
+		    probe->dtpr_id, probe->dtpr_arg);
+	} else {
+		/*
+		 * This probe is already active.  Swing the last pointer to
+		 * point to the new ECB, and issue a dtrace_sync() to assure
+		 * that all CPUs have seen the change.
+		 */
+		ASSERT(probe->dtpr_ecb_last != NULL);
+		probe->dtpr_ecb_last->dte_next = ecb;
+		probe->dtpr_ecb_last = ecb;
+		probe->dtpr_predcache = 0;
+
+		dtrace_sync();
+	}
+}
+
+static void
+dtrace_ecb_resize(dtrace_ecb_t *ecb)
+{
+	uint32_t maxalign = sizeof (dtrace_epid_t);
+	uint32_t align = sizeof (uint8_t), offs, diff;
+	dtrace_action_t *act;
+	int wastuple = 0;
+	uint32_t aggbase = UINT32_MAX;
+	dtrace_state_t *state = ecb->dte_state;
+
+	/*
+	 * If we record anything, we always record the epid.  (And we always
+	 * record it first.)
+	 */
+	offs = sizeof (dtrace_epid_t);
+	ecb->dte_size = ecb->dte_needed = sizeof (dtrace_epid_t);
+
+	for (act = ecb->dte_action; act != NULL; act = act->dta_next) {
+		dtrace_recdesc_t *rec = &act->dta_rec;
+
+		if ((align = rec->dtrd_alignment) > maxalign)
+			maxalign = align;
+
+		if (!wastuple && act->dta_intuple) {
+			/*
+			 * This is the first record in a tuple.  Align the
+			 * offset to be at offset 4 in an 8-byte aligned
+			 * block.
+			 */
+			diff = offs + sizeof (dtrace_aggid_t);
+
+			if (diff = (diff & (sizeof (uint64_t) - 1)))
+				offs += sizeof (uint64_t) - diff;
+
+			aggbase = offs - sizeof (dtrace_aggid_t);
+			ASSERT(!(aggbase & (sizeof (uint64_t) - 1)));
+		}
+
+		/*LINTED*/
+		if (rec->dtrd_size != 0 && (diff = (offs & (align - 1)))) {
+			/*
+			 * The current offset is not properly aligned; align it.
+			 */
+			offs += align - diff;
+		}
+
+		rec->dtrd_offset = offs;
+
+		if (offs + rec->dtrd_size > ecb->dte_needed) {
+			ecb->dte_needed = offs + rec->dtrd_size;
+
+			if (ecb->dte_needed > state->dts_needed)
+				state->dts_needed = ecb->dte_needed;
+		}
+
+		if (DTRACEACT_ISAGG(act->dta_kind)) {
+			dtrace_aggregation_t *agg = (dtrace_aggregation_t *)act;
+			dtrace_action_t *first = agg->dtag_first, *prev;
+
+			ASSERT(rec->dtrd_size != 0 && first != NULL);
+			ASSERT(wastuple);
+			ASSERT(aggbase != UINT32_MAX);
+
+			agg->dtag_base = aggbase;
+
+			while ((prev = first->dta_prev) != NULL &&
+			    DTRACEACT_ISAGG(prev->dta_kind)) {
+				agg = (dtrace_aggregation_t *)prev;
+				first = agg->dtag_first;
+			}
+
+			if (prev != NULL) {
+				offs = prev->dta_rec.dtrd_offset +
+				    prev->dta_rec.dtrd_size;
+			} else {
+				offs = sizeof (dtrace_epid_t);
+			}
+			wastuple = 0;
+		} else {
+			if (!act->dta_intuple)
+				ecb->dte_size = offs + rec->dtrd_size;
+
+			offs += rec->dtrd_size;
+		}
+
+		wastuple = act->dta_intuple;
+	}
+
+	if ((act = ecb->dte_action) != NULL &&
+	    !(act->dta_kind == DTRACEACT_SPECULATE && act->dta_next == NULL) &&
+	    ecb->dte_size == sizeof (dtrace_epid_t)) {
+		/*
+		 * If the size is still sizeof (dtrace_epid_t), then all
+		 * actions store no data; set the size to 0.
+		 */
+		ecb->dte_alignment = maxalign;
+		ecb->dte_size = 0;
+
+		/*
+		 * If the needed space is still sizeof (dtrace_epid_t), then
+		 * all actions need no additional space; set the needed
+		 * size to 0.
+		 */
+		if (ecb->dte_needed == sizeof (dtrace_epid_t))
+			ecb->dte_needed = 0;
+
+		return;
+	}
+
+	/*
+	 * Set our alignment, and make sure that the dte_size and dte_needed
+	 * are aligned to the size of an EPID.
+	 */
+	ecb->dte_alignment = maxalign;
+	ecb->dte_size = (ecb->dte_size + (sizeof (dtrace_epid_t) - 1)) &
+	    ~(sizeof (dtrace_epid_t) - 1);
+	ecb->dte_needed = (ecb->dte_needed + (sizeof (dtrace_epid_t) - 1)) &
+	    ~(sizeof (dtrace_epid_t) - 1);
+	ASSERT(ecb->dte_size <= ecb->dte_needed);
+}
+
+static dtrace_action_t *
+dtrace_ecb_aggregation_create(dtrace_ecb_t *ecb, dtrace_actdesc_t *desc)
+{
+	dtrace_aggregation_t *agg;
+	size_t size = sizeof (uint64_t);
+	int ntuple = desc->dtad_ntuple;
+	dtrace_action_t *act;
+	dtrace_recdesc_t *frec;
+	dtrace_aggid_t aggid;
+	dtrace_state_t *state = ecb->dte_state;
+
+	agg = kmem_zalloc(sizeof (dtrace_aggregation_t), KM_SLEEP);
+	agg->dtag_ecb = ecb;
+
+	ASSERT(DTRACEACT_ISAGG(desc->dtad_kind));
+
+	switch (desc->dtad_kind) {
+	case DTRACEAGG_MIN:
+		agg->dtag_initial = INT64_MAX;
+		agg->dtag_aggregate = dtrace_aggregate_min;
+		break;
+
+	case DTRACEAGG_MAX:
+		agg->dtag_initial = INT64_MIN;
+		agg->dtag_aggregate = dtrace_aggregate_max;
+		break;
+
+	case DTRACEAGG_COUNT:
+		agg->dtag_aggregate = dtrace_aggregate_count;
+		break;
+
+	case DTRACEAGG_QUANTIZE:
+		agg->dtag_aggregate = dtrace_aggregate_quantize;
+		size = (((sizeof (uint64_t) * NBBY) - 1) * 2 + 1) *
+		    sizeof (uint64_t);
+		break;
+
+	case DTRACEAGG_LQUANTIZE: {
+		uint16_t step = DTRACE_LQUANTIZE_STEP(desc->dtad_arg);
+		uint16_t levels = DTRACE_LQUANTIZE_LEVELS(desc->dtad_arg);
+
+		agg->dtag_initial = desc->dtad_arg;
+		agg->dtag_aggregate = dtrace_aggregate_lquantize;
+
+		if (step == 0 || levels == 0)
+			goto err;
+
+		size = levels * sizeof (uint64_t) + 3 * sizeof (uint64_t);
+		break;
+	}
+
+	case DTRACEAGG_AVG:
+		agg->dtag_aggregate = dtrace_aggregate_avg;
+		size = sizeof (uint64_t) * 2;
+		break;
+
+	case DTRACEAGG_STDDEV:
+		agg->dtag_aggregate = dtrace_aggregate_stddev;
+		size = sizeof (uint64_t) * 4;
+		break;
+
+	case DTRACEAGG_SUM:
+		agg->dtag_aggregate = dtrace_aggregate_sum;
+		break;
+
+	default:
+		goto err;
+	}
+
+	agg->dtag_action.dta_rec.dtrd_size = size;
+
+	if (ntuple == 0)
+		goto err;
+
+	/*
+	 * We must make sure that we have enough actions for the n-tuple.
+	 */
+	for (act = ecb->dte_action_last; act != NULL; act = act->dta_prev) {
+		if (DTRACEACT_ISAGG(act->dta_kind))
+			break;
+
+		if (--ntuple == 0) {
+			/*
+			 * This is the action with which our n-tuple begins.
+			 */
+			agg->dtag_first = act;
+			goto success;
+		}
+	}
+
+	/*
+	 * This n-tuple is short by ntuple elements.  Return failure.
+	 */
+	ASSERT(ntuple != 0);
+err:
+	kmem_free(agg, sizeof (dtrace_aggregation_t));
+	return (NULL);
+
+success:
+	/*
+	 * If the last action in the tuple has a size of zero, it's actually
+	 * an expression argument for the aggregating action.
+	 */
+	ASSERT(ecb->dte_action_last != NULL);
+	act = ecb->dte_action_last;
+
+	if (act->dta_kind == DTRACEACT_DIFEXPR) {
+		ASSERT(act->dta_difo != NULL);
+
+		if (act->dta_difo->dtdo_rtype.dtdt_size == 0)
+			agg->dtag_hasarg = 1;
+	}
+
+	/*
+	 * We need to allocate an id for this aggregation.
+	 */
+	aggid = (dtrace_aggid_t)(uintptr_t)vmem_alloc(state->dts_aggid_arena, 1,
+	    VM_BESTFIT | VM_SLEEP);
+
+	if (aggid - 1 >= state->dts_naggregations) {
+		dtrace_aggregation_t **oaggs = state->dts_aggregations;
+		dtrace_aggregation_t **aggs;
+		int naggs = state->dts_naggregations << 1;
+		int onaggs = state->dts_naggregations;
+
+		ASSERT(aggid == state->dts_naggregations + 1);
+
+		if (naggs == 0) {
+			ASSERT(oaggs == NULL);
+			naggs = 1;
+		}
+
+		aggs = kmem_zalloc(naggs * sizeof (*aggs), KM_SLEEP);
+
+		if (oaggs != NULL) {
+			bcopy(oaggs, aggs, onaggs * sizeof (*aggs));
+			kmem_free(oaggs, onaggs * sizeof (*aggs));
+		}
+
+		state->dts_aggregations = aggs;
+		state->dts_naggregations = naggs;
+	}
+
+	ASSERT(state->dts_aggregations[aggid - 1] == NULL);
+	state->dts_aggregations[(agg->dtag_id = aggid) - 1] = agg;
+
+	frec = &agg->dtag_first->dta_rec;
+	if (frec->dtrd_alignment < sizeof (dtrace_aggid_t))
+		frec->dtrd_alignment = sizeof (dtrace_aggid_t);
+
+	for (act = agg->dtag_first; act != NULL; act = act->dta_next) {
+		ASSERT(!act->dta_intuple);
+		act->dta_intuple = 1;
+	}
+
+	return (&agg->dtag_action);
+}
+
+static void
+dtrace_ecb_aggregation_destroy(dtrace_ecb_t *ecb, dtrace_action_t *act)
+{
+	dtrace_aggregation_t *agg = (dtrace_aggregation_t *)act;
+	dtrace_state_t *state = ecb->dte_state;
+	dtrace_aggid_t aggid = agg->dtag_id;
+
+	ASSERT(DTRACEACT_ISAGG(act->dta_kind));
+	vmem_free(state->dts_aggid_arena, (void *)(uintptr_t)aggid, 1);
+
+	ASSERT(state->dts_aggregations[aggid - 1] == agg);
+	state->dts_aggregations[aggid - 1] = NULL;
+
+	kmem_free(agg, sizeof (dtrace_aggregation_t));
+}
+
+static int
+dtrace_ecb_action_add(dtrace_ecb_t *ecb, dtrace_actdesc_t *desc)
+{
+	dtrace_action_t *action, *last;
+	dtrace_difo_t *dp = desc->dtad_difo;
+	uint32_t size = 0, align = sizeof (uint8_t), mask;
+	uint16_t format = 0;
+	dtrace_recdesc_t *rec;
+	dtrace_state_t *state = ecb->dte_state;
+	dtrace_optval_t *opt = state->dts_options, nframes, strsize;
+	uint64_t arg = desc->dtad_arg;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+	ASSERT(ecb->dte_action == NULL || ecb->dte_action->dta_refcnt == 1);
+
+	if (DTRACEACT_ISAGG(desc->dtad_kind)) {
+		/*
+		 * If this is an aggregating action, there must be neither
+		 * a speculate nor a commit on the action chain.
+		 */
+		dtrace_action_t *act;
+
+		for (act = ecb->dte_action; act != NULL; act = act->dta_next) {
+			if (act->dta_kind == DTRACEACT_COMMIT)
+				return (EINVAL);
+
+			if (act->dta_kind == DTRACEACT_SPECULATE)
+				return (EINVAL);
+		}
+
+		action = dtrace_ecb_aggregation_create(ecb, desc);
+
+		if (action == NULL)
+			return (EINVAL);
+	} else {
+		if (DTRACEACT_ISDESTRUCTIVE(desc->dtad_kind) ||
+		    (desc->dtad_kind == DTRACEACT_DIFEXPR &&
+		    dp != NULL && dp->dtdo_destructive)) {
+			state->dts_destructive = 1;
+		}
+
+		switch (desc->dtad_kind) {
+		case DTRACEACT_PRINTF:
+		case DTRACEACT_PRINTA:
+		case DTRACEACT_SYSTEM:
+		case DTRACEACT_FREOPEN:
+			/*
+			 * We know that our arg is a string -- turn it into a
+			 * format.
+			 */
+			if (arg == NULL) {
+				ASSERT(desc->dtad_kind == DTRACEACT_PRINTA);
+				format = 0;
+			} else {
+				ASSERT(arg != NULL);
+				ASSERT(arg > KERNELBASE);
+				format = dtrace_format_add(state,
+				    (char *)(uintptr_t)arg);
+			}
+
+			/*FALLTHROUGH*/
+		case DTRACEACT_LIBACT:
+		case DTRACEACT_DIFEXPR:
+			if (dp == NULL)
+				return (EINVAL);
+
+			if ((size = dp->dtdo_rtype.dtdt_size) != 0)
+				break;
+
+			if (dp->dtdo_rtype.dtdt_kind == DIF_TYPE_STRING) {
+				if (!(dp->dtdo_rtype.dtdt_flags & DIF_TF_BYREF))
+					return (EINVAL);
+
+				size = opt[DTRACEOPT_STRSIZE];
+			}
+
+			break;
+
+		case DTRACEACT_STACK:
+			if ((nframes = arg) == 0) {
+				nframes = opt[DTRACEOPT_STACKFRAMES];
+				ASSERT(nframes > 0);
+				arg = nframes;
+			}
+
+			size = nframes * sizeof (pc_t);
+			break;
+
+		case DTRACEACT_JSTACK:
+			if ((strsize = DTRACE_USTACK_STRSIZE(arg)) == 0)
+				strsize = opt[DTRACEOPT_JSTACKSTRSIZE];
+
+			if ((nframes = DTRACE_USTACK_NFRAMES(arg)) == 0)
+				nframes = opt[DTRACEOPT_JSTACKFRAMES];
+
+			arg = DTRACE_USTACK_ARG(nframes, strsize);
+
+			/*FALLTHROUGH*/
+		case DTRACEACT_USTACK:
+			if (desc->dtad_kind != DTRACEACT_JSTACK &&
+			    (nframes = DTRACE_USTACK_NFRAMES(arg)) == 0) {
+				strsize = DTRACE_USTACK_STRSIZE(arg);
+				nframes = opt[DTRACEOPT_USTACKFRAMES];
+				ASSERT(nframes > 0);
+				arg = DTRACE_USTACK_ARG(nframes, strsize);
+			}
+
+			/*
+			 * Save a slot for the pid.
+			 */
+			size = (nframes + 1) * sizeof (uint64_t);
+			size += DTRACE_USTACK_STRSIZE(arg);
+			size = P2ROUNDUP(size, (uint32_t)(sizeof (uintptr_t)));
+
+			break;
+
+		case DTRACEACT_SYM:
+		case DTRACEACT_MOD:
+			if (dp == NULL || ((size = dp->dtdo_rtype.dtdt_size) !=
+			    sizeof (uint64_t)) ||
+			    (dp->dtdo_rtype.dtdt_flags & DIF_TF_BYREF))
+				return (EINVAL);
+			break;
+
+		case DTRACEACT_USYM:
+		case DTRACEACT_UMOD:
+		case DTRACEACT_UADDR:
+			if (dp == NULL ||
+			    (dp->dtdo_rtype.dtdt_size != sizeof (uint64_t)) ||
+			    (dp->dtdo_rtype.dtdt_flags & DIF_TF_BYREF))
+				return (EINVAL);
+
+			/*
+			 * We have a slot for the pid, plus a slot for the
+			 * argument.  To keep things simple (aligned with
+			 * bitness-neutral sizing), we store each as a 64-bit
+			 * quantity.
+			 */
+			size = 2 * sizeof (uint64_t);
+			break;
+
+		case DTRACEACT_STOP:
+		case DTRACEACT_BREAKPOINT:
+		case DTRACEACT_PANIC:
+			break;
+
+		case DTRACEACT_CHILL:
+		case DTRACEACT_DISCARD:
+		case DTRACEACT_RAISE:
+			if (dp == NULL)
+				return (EINVAL);
+			break;
+
+		case DTRACEACT_EXIT:
+			if (dp == NULL ||
+			    (size = dp->dtdo_rtype.dtdt_size) != sizeof (int) ||
+			    (dp->dtdo_rtype.dtdt_flags & DIF_TF_BYREF))
+				return (EINVAL);
+			break;
+
+		case DTRACEACT_SPECULATE:
+			if (ecb->dte_size > sizeof (dtrace_epid_t))
+				return (EINVAL);
+
+			if (dp == NULL)
+				return (EINVAL);
+
+			state->dts_speculates = 1;
+			break;
+
+		case DTRACEACT_COMMIT: {
+			dtrace_action_t *act = ecb->dte_action;
+
+			for (; act != NULL; act = act->dta_next) {
+				if (act->dta_kind == DTRACEACT_COMMIT)
+					return (EINVAL);
+			}
+
+			if (dp == NULL)
+				return (EINVAL);
+			break;
+		}
+
+		default:
+			return (EINVAL);
+		}
+
+		if (size != 0 || desc->dtad_kind == DTRACEACT_SPECULATE) {
+			/*
+			 * If this is a data-storing action or a speculate,
+			 * we must be sure that there isn't a commit on the
+			 * action chain.
+			 */
+			dtrace_action_t *act = ecb->dte_action;
+
+			for (; act != NULL; act = act->dta_next) {
+				if (act->dta_kind == DTRACEACT_COMMIT)
+					return (EINVAL);
+			}
+		}
+
+		action = kmem_zalloc(sizeof (dtrace_action_t), KM_SLEEP);
+		action->dta_rec.dtrd_size = size;
+	}
+
+	action->dta_refcnt = 1;
+	rec = &action->dta_rec;
+	size = rec->dtrd_size;
+
+	for (mask = sizeof (uint64_t) - 1; size != 0 && mask > 0; mask >>= 1) {
+		if (!(size & mask)) {
+			align = mask + 1;
+			break;
+		}
+	}
+
+	action->dta_kind = desc->dtad_kind;
+
+	if ((action->dta_difo = dp) != NULL)
+		dtrace_difo_hold(dp);
+
+	rec->dtrd_action = action->dta_kind;
+	rec->dtrd_arg = arg;
+	rec->dtrd_uarg = desc->dtad_uarg;
+	rec->dtrd_alignment = (uint16_t)align;
+	rec->dtrd_format = format;
+
+	if ((last = ecb->dte_action_last) != NULL) {
+		ASSERT(ecb->dte_action != NULL);
+		action->dta_prev = last;
+		last->dta_next = action;
+	} else {
+		ASSERT(ecb->dte_action == NULL);
+		ecb->dte_action = action;
+	}
+
+	ecb->dte_action_last = action;
+
+	return (0);
+}
+
+static void
+dtrace_ecb_action_remove(dtrace_ecb_t *ecb)
+{
+	dtrace_action_t *act = ecb->dte_action, *next;
+	dtrace_vstate_t *vstate = &ecb->dte_state->dts_vstate;
+	dtrace_difo_t *dp;
+	uint16_t format;
+
+	if (act != NULL && act->dta_refcnt > 1) {
+		ASSERT(act->dta_next == NULL || act->dta_next->dta_refcnt == 1);
+		act->dta_refcnt--;
+	} else {
+		for (; act != NULL; act = next) {
+			next = act->dta_next;
+			ASSERT(next != NULL || act == ecb->dte_action_last);
+			ASSERT(act->dta_refcnt == 1);
+
+			if ((format = act->dta_rec.dtrd_format) != 0)
+				dtrace_format_remove(ecb->dte_state, format);
+
+			if ((dp = act->dta_difo) != NULL)
+				dtrace_difo_release(dp, vstate);
+
+			if (DTRACEACT_ISAGG(act->dta_kind)) {
+				dtrace_ecb_aggregation_destroy(ecb, act);
+			} else {
+				kmem_free(act, sizeof (dtrace_action_t));
+			}
+		}
+	}
+
+	ecb->dte_action = NULL;
+	ecb->dte_action_last = NULL;
+	ecb->dte_size = sizeof (dtrace_epid_t);
+}
+
+static void
+dtrace_ecb_disable(dtrace_ecb_t *ecb)
+{
+	/*
+	 * We disable the ECB by removing it from its probe.
+	 */
+	dtrace_ecb_t *pecb, *prev = NULL;
+	dtrace_probe_t *probe = ecb->dte_probe;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+
+	if (probe == NULL) {
+		/*
+		 * This is the NULL probe; there is nothing to disable.
+		 */
+		return;
+	}
+
+	for (pecb = probe->dtpr_ecb; pecb != NULL; pecb = pecb->dte_next) {
+		if (pecb == ecb)
+			break;
+		prev = pecb;
+	}
+
+	ASSERT(pecb != NULL);
+
+	if (prev == NULL) {
+		probe->dtpr_ecb = ecb->dte_next;
+	} else {
+		prev->dte_next = ecb->dte_next;
+	}
+
+	if (ecb == probe->dtpr_ecb_last) {
+		ASSERT(ecb->dte_next == NULL);
+		probe->dtpr_ecb_last = prev;
+	}
+
+	/*
+	 * The ECB has been disconnected from the probe; now sync to assure
+	 * that all CPUs have seen the change before returning.
+	 */
+	dtrace_sync();
+
+	if (probe->dtpr_ecb == NULL) {
+		/*
+		 * That was the last ECB on the probe; clear the predicate
+		 * cache ID for the probe, disable it and sync one more time
+		 * to assure that we'll never hit it again.
+		 */
+		dtrace_provider_t *prov = probe->dtpr_provider;
+
+		ASSERT(ecb->dte_next == NULL);
+		ASSERT(probe->dtpr_ecb_last == NULL);
+		probe->dtpr_predcache = DTRACE_CACHEIDNONE;
+		prov->dtpv_pops.dtps_disable(prov->dtpv_arg,
+		    probe->dtpr_id, probe->dtpr_arg);
+		dtrace_sync();
+	} else {
+		/*
+		 * There is at least one ECB remaining on the probe.  If there
+		 * is _exactly_ one, set the probe's predicate cache ID to be
+		 * the predicate cache ID of the remaining ECB.
+		 */
+		ASSERT(probe->dtpr_ecb_last != NULL);
+		ASSERT(probe->dtpr_predcache == DTRACE_CACHEIDNONE);
+
+		if (probe->dtpr_ecb == probe->dtpr_ecb_last) {
+			dtrace_predicate_t *p = probe->dtpr_ecb->dte_predicate;
+
+			ASSERT(probe->dtpr_ecb->dte_next == NULL);
+
+			if (p != NULL)
+				probe->dtpr_predcache = p->dtp_cacheid;
+		}
+
+		ecb->dte_next = NULL;
+	}
+}
+
+static void
+dtrace_ecb_destroy(dtrace_ecb_t *ecb)
+{
+	dtrace_state_t *state = ecb->dte_state;
+	dtrace_vstate_t *vstate = &state->dts_vstate;
+	dtrace_predicate_t *pred;
+	dtrace_epid_t epid = ecb->dte_epid;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+	ASSERT(ecb->dte_next == NULL);
+	ASSERT(ecb->dte_probe == NULL || ecb->dte_probe->dtpr_ecb != ecb);
+
+	if ((pred = ecb->dte_predicate) != NULL)
+		dtrace_predicate_release(pred, vstate);
+
+	dtrace_ecb_action_remove(ecb);
+
+	ASSERT(state->dts_ecbs[epid - 1] == ecb);
+	state->dts_ecbs[epid - 1] = NULL;
+
+	kmem_free(ecb, sizeof (dtrace_ecb_t));
+}
+
+static dtrace_ecb_t *
+dtrace_ecb_create(dtrace_state_t *state, dtrace_probe_t *probe,
+    dtrace_enabling_t *enab)
+{
+	dtrace_ecb_t *ecb;
+	dtrace_predicate_t *pred;
+	dtrace_actdesc_t *act;
+	dtrace_provider_t *prov;
+	dtrace_ecbdesc_t *desc = enab->dten_current;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+	ASSERT(state != NULL);
+
+	ecb = dtrace_ecb_add(state, probe);
+	ecb->dte_uarg = desc->dted_uarg;
+
+	if ((pred = desc->dted_pred.dtpdd_predicate) != NULL) {
+		dtrace_predicate_hold(pred);
+		ecb->dte_predicate = pred;
+	}
+
+	if (probe != NULL) {
+		/*
+		 * If the provider shows more leg than the consumer is old
+		 * enough to see, we need to enable the appropriate implicit
+		 * predicate bits to prevent the ecb from activating at
+		 * revealing times.
+		 *
+		 * Providers specifying DTRACE_PRIV_USER at register time
+		 * are stating that they need the /proc-style privilege
+		 * model to be enforced, and this is what DTRACE_COND_OWNER
+		 * and DTRACE_COND_ZONEOWNER will then do at probe time.
+		 */
+		prov = probe->dtpr_provider;
+		if (!(state->dts_cred.dcr_visible & DTRACE_CRV_ALLPROC) &&
+		    (prov->dtpv_priv.dtpp_flags & DTRACE_PRIV_USER))
+			ecb->dte_cond |= DTRACE_COND_OWNER;
+
+		if (!(state->dts_cred.dcr_visible & DTRACE_CRV_ALLZONE) &&
+		    (prov->dtpv_priv.dtpp_flags & DTRACE_PRIV_USER))
+			ecb->dte_cond |= DTRACE_COND_ZONEOWNER;
+
+		/*
+		 * If the provider shows us kernel innards and the user
+		 * is lacking sufficient privilege, enable the
+		 * DTRACE_COND_USERMODE implicit predicate.
+		 */
+		if (!(state->dts_cred.dcr_visible & DTRACE_CRV_KERNEL) &&
+		    (prov->dtpv_priv.dtpp_flags & DTRACE_PRIV_KERNEL))
+			ecb->dte_cond |= DTRACE_COND_USERMODE;
+	}
+
+	if (dtrace_ecb_create_cache != NULL) {
+		/*
+		 * If we have a cached ecb, we'll use its action list instead
+		 * of creating our own (saving both time and space).
+		 */
+		dtrace_ecb_t *cached = dtrace_ecb_create_cache;
+		dtrace_action_t *act = cached->dte_action;
+
+		if (act != NULL) {
+			ASSERT(act->dta_refcnt > 0);
+			act->dta_refcnt++;
+			ecb->dte_action = act;
+			ecb->dte_action_last = cached->dte_action_last;
+			ecb->dte_needed = cached->dte_needed;
+			ecb->dte_size = cached->dte_size;
+			ecb->dte_alignment = cached->dte_alignment;
+		}
+
+		return (ecb);
+	}
+
+	for (act = desc->dted_action; act != NULL; act = act->dtad_next) {
+		if ((enab->dten_error = dtrace_ecb_action_add(ecb, act)) != 0) {
+			dtrace_ecb_destroy(ecb);
+			return (NULL);
+		}
+	}
+
+	dtrace_ecb_resize(ecb);
+
+	return (dtrace_ecb_create_cache = ecb);
+}
+
+static int
+dtrace_ecb_create_enable(dtrace_probe_t *probe, void *arg)
+{
+	dtrace_ecb_t *ecb;
+	dtrace_enabling_t *enab = arg;
+	dtrace_state_t *state = enab->dten_vstate->dtvs_state;
+
+	ASSERT(state != NULL);
+
+	if (probe != NULL && probe->dtpr_gen < enab->dten_probegen) {
+		/*
+		 * This probe was created in a generation for which this
+		 * enabling has previously created ECBs; we don't want to
+		 * enable it again, so just kick out.
+		 */
+		return (DTRACE_MATCH_NEXT);
+	}
+
+	if ((ecb = dtrace_ecb_create(state, probe, enab)) == NULL)
+		return (DTRACE_MATCH_DONE);
+
+	dtrace_ecb_enable(ecb);
+	return (DTRACE_MATCH_NEXT);
+}
+
+static dtrace_ecb_t *
+dtrace_epid2ecb(dtrace_state_t *state, dtrace_epid_t id)
+{
+	dtrace_ecb_t *ecb;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+
+	if (id == 0 || id > state->dts_necbs)
+		return (NULL);
+
+	ASSERT(state->dts_necbs > 0 && state->dts_ecbs != NULL);
+	ASSERT((ecb = state->dts_ecbs[id - 1]) == NULL || ecb->dte_epid == id);
+
+	return (state->dts_ecbs[id - 1]);
+}
+
+static dtrace_aggregation_t *
+dtrace_aggid2agg(dtrace_state_t *state, dtrace_aggid_t id)
+{
+	dtrace_aggregation_t *agg;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+
+	if (id == 0 || id > state->dts_naggregations)
+		return (NULL);
+
+	ASSERT(state->dts_naggregations > 0 && state->dts_aggregations != NULL);
+	ASSERT((agg = state->dts_aggregations[id - 1]) == NULL ||
+	    agg->dtag_id == id);
+
+	return (state->dts_aggregations[id - 1]);
+}
+
+/*
+ * DTrace Buffer Functions
+ *
+ * The following functions manipulate DTrace buffers.  Most of these functions
+ * are called in the context of establishing or processing consumer state;
+ * exceptions are explicitly noted.
+ */
+
+/*
+ * Note:  called from cross call context.  This function switches the two
+ * buffers on a given CPU.  The atomicity of this operation is assured by
+ * disabling interrupts while the actual switch takes place; the disabling of
+ * interrupts serializes the execution with any execution of dtrace_probe() on
+ * the same CPU.
+ */
+static void
+dtrace_buffer_switch(dtrace_buffer_t *buf)
+{
+	caddr_t tomax = buf->dtb_tomax;
+	caddr_t xamot = buf->dtb_xamot;
+	dtrace_icookie_t cookie;
+
+	ASSERT(!(buf->dtb_flags & DTRACEBUF_NOSWITCH));
+	ASSERT(!(buf->dtb_flags & DTRACEBUF_RING));
+
+	cookie = dtrace_interrupt_disable();
+	buf->dtb_tomax = xamot;
+	buf->dtb_xamot = tomax;
+	buf->dtb_xamot_drops = buf->dtb_drops;
+	buf->dtb_xamot_offset = buf->dtb_offset;
+	buf->dtb_xamot_errors = buf->dtb_errors;
+	buf->dtb_xamot_flags = buf->dtb_flags;
+	buf->dtb_offset = 0;
+	buf->dtb_drops = 0;
+	buf->dtb_errors = 0;
+	buf->dtb_flags &= ~(DTRACEBUF_ERROR | DTRACEBUF_DROPPED);
+	dtrace_interrupt_enable(cookie);
+}
+
+/*
+ * Note:  called from cross call context.  This function activates a buffer
+ * on a CPU.  As with dtrace_buffer_switch(), the atomicity of the operation
+ * is guaranteed by the disabling of interrupts.
+ */
+static void
+dtrace_buffer_activate(dtrace_state_t *state)
+{
+	dtrace_buffer_t *buf;
+	dtrace_icookie_t cookie = dtrace_interrupt_disable();
+
+	buf = &state->dts_buffer[CPU->cpu_id];
+
+	if (buf->dtb_tomax != NULL) {
+		/*
+		 * We might like to assert that the buffer is marked inactive,
+		 * but this isn't necessarily true:  the buffer for the CPU
+		 * that processes the BEGIN probe has its buffer activated
+		 * manually.  In this case, we take the (harmless) action
+		 * re-clearing the bit INACTIVE bit.
+		 */
+		buf->dtb_flags &= ~DTRACEBUF_INACTIVE;
+	}
+
+	dtrace_interrupt_enable(cookie);
+}
+
+static int
+dtrace_buffer_alloc(dtrace_buffer_t *bufs, size_t size, int flags,
+    processorid_t cpu)
+{
+	cpu_t *cp;
+	dtrace_buffer_t *buf;
+
+	ASSERT(MUTEX_HELD(&cpu_lock));
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+
+	if (size > dtrace_nonroot_maxsize &&
+	    !PRIV_POLICY_CHOICE(CRED(), PRIV_ALL, B_FALSE))
+		return (EFBIG);
+
+	cp = cpu_list;
+
+	do {
+		if (cpu != DTRACE_CPUALL && cpu != cp->cpu_id)
+			continue;
+
+		buf = &bufs[cp->cpu_id];
+
+		/*
+		 * If there is already a buffer allocated for this CPU, it
+		 * is only possible that this is a DR event.  In this case,
+		 * the buffer size must match our specified size.
+		 */
+		if (buf->dtb_tomax != NULL) {
+			ASSERT(buf->dtb_size == size);
+			continue;
+		}
+
+		ASSERT(buf->dtb_xamot == NULL);
+
+		if ((buf->dtb_tomax = kmem_zalloc(size, KM_NOSLEEP)) == NULL)
+			goto err;
+
+		buf->dtb_size = size;
+		buf->dtb_flags = flags;
+		buf->dtb_offset = 0;
+		buf->dtb_drops = 0;
+
+		if (flags & DTRACEBUF_NOSWITCH)
+			continue;
+
+		if ((buf->dtb_xamot = kmem_zalloc(size, KM_NOSLEEP)) == NULL)
+			goto err;
+	} while ((cp = cp->cpu_next) != cpu_list);
+
+	return (0);
+
+err:
+	cp = cpu_list;
+
+	do {
+		if (cpu != DTRACE_CPUALL && cpu != cp->cpu_id)
+			continue;
+
+		buf = &bufs[cp->cpu_id];
+
+		if (buf->dtb_xamot != NULL) {
+			ASSERT(buf->dtb_tomax != NULL);
+			ASSERT(buf->dtb_size == size);
+			kmem_free(buf->dtb_xamot, size);
+		}
+
+		if (buf->dtb_tomax != NULL) {
+			ASSERT(buf->dtb_size == size);
+			kmem_free(buf->dtb_tomax, size);
+		}
+
+		buf->dtb_tomax = NULL;
+		buf->dtb_xamot = NULL;
+		buf->dtb_size = 0;
+	} while ((cp = cp->cpu_next) != cpu_list);
+
+	return (ENOMEM);
+}
+
+/*
+ * Note:  called from probe context.  This function just increments the drop
+ * count on a buffer.  It has been made a function to allow for the
+ * possibility of understanding the source of mysterious drop counts.  (A
+ * problem for which one may be particularly disappointed that DTrace cannot
+ * be used to understand DTrace.)
+ */
+static void
+dtrace_buffer_drop(dtrace_buffer_t *buf)
+{
+	buf->dtb_drops++;
+}
+
+/*
+ * Note:  called from probe context.  This function is called to reserve space
+ * in a buffer.  If mstate is non-NULL, sets the scratch base and size in the
+ * mstate.  Returns the new offset in the buffer, or a negative value if an
+ * error has occurred.
+ */
+static intptr_t
+dtrace_buffer_reserve(dtrace_buffer_t *buf, size_t needed, size_t align,
+    dtrace_state_t *state, dtrace_mstate_t *mstate)
+{
+	intptr_t offs = buf->dtb_offset, soffs;
+	intptr_t woffs;
+	caddr_t tomax;
+	size_t total;
+
+	if (buf->dtb_flags & DTRACEBUF_INACTIVE)
+		return (-1);
+
+	if ((tomax = buf->dtb_tomax) == NULL) {
+		dtrace_buffer_drop(buf);
+		return (-1);
+	}
+
+	if (!(buf->dtb_flags & (DTRACEBUF_RING | DTRACEBUF_FILL))) {
+		while (offs & (align - 1)) {
+			/*
+			 * Assert that our alignment is off by a number which
+			 * is itself sizeof (uint32_t) aligned.
+			 */
+			ASSERT(!((align - (offs & (align - 1))) &
+			    (sizeof (uint32_t) - 1)));
+			DTRACE_STORE(uint32_t, tomax, offs, DTRACE_EPIDNONE);
+			offs += sizeof (uint32_t);
+		}
+
+		if ((soffs = offs + needed) > buf->dtb_size) {
+			dtrace_buffer_drop(buf);
+			return (-1);
+		}
+
+		if (mstate == NULL)
+			return (offs);
+
+		mstate->dtms_scratch_base = (uintptr_t)tomax + soffs;
+		mstate->dtms_scratch_size = buf->dtb_size - soffs;
+		mstate->dtms_scratch_ptr = mstate->dtms_scratch_base;
+
+		return (offs);
+	}
+
+	if (buf->dtb_flags & DTRACEBUF_FILL) {
+		if (state->dts_activity != DTRACE_ACTIVITY_COOLDOWN &&
+		    (buf->dtb_flags & DTRACEBUF_FULL))
+			return (-1);
+		goto out;
+	}
+
+	total = needed + (offs & (align - 1));
+
+	/*
+	 * For a ring buffer, life is quite a bit more complicated.  Before
+	 * we can store any padding, we need to adjust our wrapping offset.
+	 * (If we've never before wrapped or we're not about to, no adjustment
+	 * is required.)
+	 */
+	if ((buf->dtb_flags & DTRACEBUF_WRAPPED) ||
+	    offs + total > buf->dtb_size) {
+		woffs = buf->dtb_xamot_offset;
+
+		if (offs + total > buf->dtb_size) {
+			/*
+			 * We can't fit in the end of the buffer.  First, a
+			 * sanity check that we can fit in the buffer at all.
+			 */
+			if (total > buf->dtb_size) {
+				dtrace_buffer_drop(buf);
+				return (-1);
+			}
+
+			/*
+			 * We're going to be storing at the top of the buffer,
+			 * so now we need to deal with the wrapped offset.  We
+			 * only reset our wrapped offset to 0 if it is
+			 * currently greater than the current offset.  If it
+			 * is less than the current offset, it is because a
+			 * previous allocation induced a wrap -- but the
+			 * allocation didn't subsequently take the space due
+			 * to an error or false predicate evaluation.  In this
+			 * case, we'll just leave the wrapped offset alone: if
+			 * the wrapped offset hasn't been advanced far enough
+			 * for this allocation, it will be adjusted in the
+			 * lower loop.
+			 */
+			if (buf->dtb_flags & DTRACEBUF_WRAPPED) {
+				if (woffs >= offs)
+					woffs = 0;
+			} else {
+				woffs = 0;
+			}
+
+			/*
+			 * Now we know that we're going to be storing to the
+			 * top of the buffer and that there is room for us
+			 * there.  We need to clear the buffer from the current
+			 * offset to the end (there may be old gunk there).
+			 */
+			while (offs < buf->dtb_size)
+				tomax[offs++] = 0;
+
+			/*
+			 * We need to set our offset to zero.  And because we
+			 * are wrapping, we need to set the bit indicating as
+			 * much.  We can also adjust our needed space back
+			 * down to the space required by the ECB -- we know
+			 * that the top of the buffer is aligned.
+			 */
+			offs = 0;
+			total = needed;
+			buf->dtb_flags |= DTRACEBUF_WRAPPED;
+		} else {
+			/*
+			 * There is room for us in the buffer, so we simply
+			 * need to check the wrapped offset.
+			 */
+			if (woffs < offs) {
+				/*
+				 * The wrapped offset is less than the offset.
+				 * This can happen if we allocated buffer space
+				 * that induced a wrap, but then we didn't
+				 * subsequently take the space due to an error
+				 * or false predicate evaluation.  This is
+				 * okay; we know that _this_ allocation isn't
+				 * going to induce a wrap.  We still can't
+				 * reset the wrapped offset to be zero,
+				 * however: the space may have been trashed in
+				 * the previous failed probe attempt.  But at
+				 * least the wrapped offset doesn't need to
+				 * be adjusted at all...
+				 */
+				goto out;
+			}
+		}
+
+		while (offs + total > woffs) {
+			dtrace_epid_t epid = *(uint32_t *)(tomax + woffs);
+			size_t size;
+
+			if (epid == DTRACE_EPIDNONE) {
+				size = sizeof (uint32_t);
+			} else {
+				ASSERT(epid <= state->dts_necbs);
+				ASSERT(state->dts_ecbs[epid - 1] != NULL);
+
+				size = state->dts_ecbs[epid - 1]->dte_size;
+			}
+
+			ASSERT(woffs + size <= buf->dtb_size);
+			ASSERT(size != 0);
+
+			if (woffs + size == buf->dtb_size) {
+				/*
+				 * We've reached the end of the buffer; we want
+				 * to set the wrapped offset to 0 and break
+				 * out.  However, if the offs is 0, then we're
+				 * in a strange edge-condition:  the amount of
+				 * space that we want to reserve plus the size
+				 * of the record that we're overwriting is
+				 * greater than the size of the buffer.  This
+				 * is problematic because if we reserve the
+				 * space but subsequently don't consume it (due
+				 * to a failed predicate or error) the wrapped
+				 * offset will be 0 -- yet the EPID at offset 0
+				 * will not be committed.  This situation is
+				 * relatively easy to deal with:  if we're in
+				 * this case, the buffer is indistinguishable
+				 * from one that hasn't wrapped; we need only
+				 * finish the job by clearing the wrapped bit,
+				 * explicitly setting the offset to be 0, and
+				 * zero'ing out the old data in the buffer.
+				 */
+				if (offs == 0) {
+					buf->dtb_flags &= ~DTRACEBUF_WRAPPED;
+					buf->dtb_offset = 0;
+					woffs = total;
+
+					while (woffs < buf->dtb_size)
+						tomax[woffs++] = 0;
+				}
+
+				woffs = 0;
+				break;
+			}
+
+			woffs += size;
+		}
+
+		/*
+		 * We have a wrapped offset.  It may be that the wrapped offset
+		 * has become zero -- that's okay.
+		 */
+		buf->dtb_xamot_offset = woffs;
+	}
+
+out:
+	/*
+	 * Now we can plow the buffer with any necessary padding.
+	 */
+	while (offs & (align - 1)) {
+		/*
+		 * Assert that our alignment is off by a number which
+		 * is itself sizeof (uint32_t) aligned.
+		 */
+		ASSERT(!((align - (offs & (align - 1))) &
+		    (sizeof (uint32_t) - 1)));
+		DTRACE_STORE(uint32_t, tomax, offs, DTRACE_EPIDNONE);
+		offs += sizeof (uint32_t);
+	}
+
+	if (buf->dtb_flags & DTRACEBUF_FILL) {
+		if (offs + needed > buf->dtb_size - state->dts_reserve) {
+			buf->dtb_flags |= DTRACEBUF_FULL;
+			return (-1);
+		}
+	}
+
+	if (mstate == NULL)
+		return (offs);
+
+	/*
+	 * For ring buffers and fill buffers, the scratch space is always
+	 * the inactive buffer.
+	 */
+	mstate->dtms_scratch_base = (uintptr_t)buf->dtb_xamot;
+	mstate->dtms_scratch_size = buf->dtb_size;
+	mstate->dtms_scratch_ptr = mstate->dtms_scratch_base;
+
+	return (offs);
+}
+
+static void
+dtrace_buffer_polish(dtrace_buffer_t *buf)
+{
+	ASSERT(buf->dtb_flags & DTRACEBUF_RING);
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+
+	if (!(buf->dtb_flags & DTRACEBUF_WRAPPED))
+		return;
+
+	/*
+	 * We need to polish the ring buffer.  There are three cases:
+	 *
+	 * - The first (and presumably most common) is that there is no gap
+	 *   between the buffer offset and the wrapped offset.  In this case,
+	 *   there is nothing in the buffer that isn't valid data; we can
+	 *   mark the buffer as polished and return.
+	 *
+	 * - The second (less common than the first but still more common
+	 *   than the third) is that there is a gap between the buffer offset
+	 *   and the wrapped offset, and the wrapped offset is larger than the
+	 *   buffer offset.  This can happen because of an alignment issue, or
+	 *   can happen because of a call to dtrace_buffer_reserve() that
+	 *   didn't subsequently consume the buffer space.  In this case,
+	 *   we need to zero the data from the buffer offset to the wrapped
+	 *   offset.
+	 *
+	 * - The third (and least common) is that there is a gap between the
+	 *   buffer offset and the wrapped offset, but the wrapped offset is
+	 *   _less_ than the buffer offset.  This can only happen because a
+	 *   call to dtrace_buffer_reserve() induced a wrap, but the space
+	 *   was not subsequently consumed.  In this case, we need to zero the
+	 *   space from the offset to the end of the buffer _and_ from the
+	 *   top of the buffer to the wrapped offset.
+	 */
+	if (buf->dtb_offset < buf->dtb_xamot_offset) {
+		bzero(buf->dtb_tomax + buf->dtb_offset,
+		    buf->dtb_xamot_offset - buf->dtb_offset);
+	}
+
+	if (buf->dtb_offset > buf->dtb_xamot_offset) {
+		bzero(buf->dtb_tomax + buf->dtb_offset,
+		    buf->dtb_size - buf->dtb_offset);
+		bzero(buf->dtb_tomax, buf->dtb_xamot_offset);
+	}
+}
+
+static void
+dtrace_buffer_free(dtrace_buffer_t *bufs)
+{
+	int i;
+
+	for (i = 0; i < NCPU; i++) {
+		dtrace_buffer_t *buf = &bufs[i];
+
+		if (buf->dtb_tomax == NULL) {
+			ASSERT(buf->dtb_xamot == NULL);
+			ASSERT(buf->dtb_size == 0);
+			continue;
+		}
+
+		if (buf->dtb_xamot != NULL) {
+			ASSERT(!(buf->dtb_flags & DTRACEBUF_NOSWITCH));
+			kmem_free(buf->dtb_xamot, buf->dtb_size);
+		}
+
+		kmem_free(buf->dtb_tomax, buf->dtb_size);
+		buf->dtb_size = 0;
+		buf->dtb_tomax = NULL;
+		buf->dtb_xamot = NULL;
+	}
+}
+
+/*
+ * DTrace Enabling Functions
+ */
+static dtrace_enabling_t *
+dtrace_enabling_create(dtrace_vstate_t *vstate)
+{
+	dtrace_enabling_t *enab;
+
+	enab = kmem_zalloc(sizeof (dtrace_enabling_t), KM_SLEEP);
+	enab->dten_vstate = vstate;
+
+	return (enab);
+}
+
+static void
+dtrace_enabling_add(dtrace_enabling_t *enab, dtrace_ecbdesc_t *ecb)
+{
+	dtrace_ecbdesc_t **ndesc;
+	size_t osize, nsize;
+
+	/*
+	 * We can't add to enablings after we've enabled them, or after we've
+	 * retained them.
+	 */
+	ASSERT(enab->dten_probegen == 0);
+	ASSERT(enab->dten_next == NULL && enab->dten_prev == NULL);
+
+	if (enab->dten_ndesc < enab->dten_maxdesc) {
+		enab->dten_desc[enab->dten_ndesc++] = ecb;
+		return;
+	}
+
+	osize = enab->dten_maxdesc * sizeof (dtrace_enabling_t *);
+
+	if (enab->dten_maxdesc == 0) {
+		enab->dten_maxdesc = 1;
+	} else {
+		enab->dten_maxdesc <<= 1;
+	}
+
+	ASSERT(enab->dten_ndesc < enab->dten_maxdesc);
+
+	nsize = enab->dten_maxdesc * sizeof (dtrace_enabling_t *);
+	ndesc = kmem_zalloc(nsize, KM_SLEEP);
+	bcopy(enab->dten_desc, ndesc, osize);
+	kmem_free(enab->dten_desc, osize);
+
+	enab->dten_desc = ndesc;
+	enab->dten_desc[enab->dten_ndesc++] = ecb;
+}
+
+static void
+dtrace_enabling_addlike(dtrace_enabling_t *enab, dtrace_ecbdesc_t *ecb,
+    dtrace_probedesc_t *pd)
+{
+	dtrace_ecbdesc_t *new;
+	dtrace_predicate_t *pred;
+	dtrace_actdesc_t *act;
+
+	/*
+	 * We're going to create a new ECB description that matches the
+	 * specified ECB in every way, but has the specified probe description.
+	 */
+	new = kmem_zalloc(sizeof (dtrace_ecbdesc_t), KM_SLEEP);
+
+	if ((pred = ecb->dted_pred.dtpdd_predicate) != NULL)
+		dtrace_predicate_hold(pred);
+
+	for (act = ecb->dted_action; act != NULL; act = act->dtad_next)
+		dtrace_actdesc_hold(act);
+
+	new->dted_action = ecb->dted_action;
+	new->dted_pred = ecb->dted_pred;
+	new->dted_probe = *pd;
+	new->dted_uarg = ecb->dted_uarg;
+
+	dtrace_enabling_add(enab, new);
+}
+
+static void
+dtrace_enabling_dump(dtrace_enabling_t *enab)
+{
+	int i;
+
+	for (i = 0; i < enab->dten_ndesc; i++) {
+		dtrace_probedesc_t *desc = &enab->dten_desc[i]->dted_probe;
+
+		cmn_err(CE_NOTE, "enabling probe %d (%s:%s:%s:%s)", i,
+		    desc->dtpd_provider, desc->dtpd_mod,
+		    desc->dtpd_func, desc->dtpd_name);
+	}
+}
+
+static void
+dtrace_enabling_destroy(dtrace_enabling_t *enab)
+{
+	int i;
+	dtrace_ecbdesc_t *ep;
+	dtrace_vstate_t *vstate = enab->dten_vstate;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+
+	for (i = 0; i < enab->dten_ndesc; i++) {
+		dtrace_actdesc_t *act, *next;
+		dtrace_predicate_t *pred;
+
+		ep = enab->dten_desc[i];
+
+		if ((pred = ep->dted_pred.dtpdd_predicate) != NULL)
+			dtrace_predicate_release(pred, vstate);
+
+		for (act = ep->dted_action; act != NULL; act = next) {
+			next = act->dtad_next;
+			dtrace_actdesc_release(act, vstate);
+		}
+
+		kmem_free(ep, sizeof (dtrace_ecbdesc_t));
+	}
+
+	kmem_free(enab->dten_desc,
+	    enab->dten_maxdesc * sizeof (dtrace_enabling_t *));
+
+	/*
+	 * If this was a retained enabling, decrement the dts_nretained count
+	 * and take it off of the dtrace_retained list.
+	 */
+	if (enab->dten_prev != NULL || enab->dten_next != NULL ||
+	    dtrace_retained == enab) {
+		ASSERT(enab->dten_vstate->dtvs_state != NULL);
+		ASSERT(enab->dten_vstate->dtvs_state->dts_nretained > 0);
+		enab->dten_vstate->dtvs_state->dts_nretained--;
+	}
+
+	if (enab->dten_prev == NULL) {
+		if (dtrace_retained == enab) {
+			dtrace_retained = enab->dten_next;
+
+			if (dtrace_retained != NULL)
+				dtrace_retained->dten_prev = NULL;
+		}
+	} else {
+		ASSERT(enab != dtrace_retained);
+		ASSERT(dtrace_retained != NULL);
+		enab->dten_prev->dten_next = enab->dten_next;
+	}
+
+	if (enab->dten_next != NULL) {
+		ASSERT(dtrace_retained != NULL);
+		enab->dten_next->dten_prev = enab->dten_prev;
+	}
+
+	kmem_free(enab, sizeof (dtrace_enabling_t));
+}
+
+static int
+dtrace_enabling_retain(dtrace_enabling_t *enab)
+{
+	dtrace_state_t *state;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+	ASSERT(enab->dten_next == NULL && enab->dten_prev == NULL);
+	ASSERT(enab->dten_vstate != NULL);
+
+	state = enab->dten_vstate->dtvs_state;
+	ASSERT(state != NULL);
+
+	/*
+	 * We only allow each state to retain dtrace_retain_max enablings.
+	 */
+	if (state->dts_nretained >= dtrace_retain_max)
+		return (ENOSPC);
+
+	state->dts_nretained++;
+
+	if (dtrace_retained == NULL) {
+		dtrace_retained = enab;
+		return (0);
+	}
+
+	enab->dten_next = dtrace_retained;
+	dtrace_retained->dten_prev = enab;
+	dtrace_retained = enab;
+
+	return (0);
+}
+
+static int
+dtrace_enabling_replicate(dtrace_state_t *state, dtrace_probedesc_t *match,
+    dtrace_probedesc_t *create)
+{
+	dtrace_enabling_t *new, *enab;
+	int found = 0, err = ENOENT;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+	ASSERT(strlen(match->dtpd_provider) < DTRACE_PROVNAMELEN);
+	ASSERT(strlen(match->dtpd_mod) < DTRACE_MODNAMELEN);
+	ASSERT(strlen(match->dtpd_func) < DTRACE_FUNCNAMELEN);
+	ASSERT(strlen(match->dtpd_name) < DTRACE_NAMELEN);
+
+	new = dtrace_enabling_create(&state->dts_vstate);
+
+	/*
+	 * Iterate over all retained enablings, looking for enablings that
+	 * match the specified state.
+	 */
+	for (enab = dtrace_retained; enab != NULL; enab = enab->dten_next) {
+		int i;
+
+		/*
+		 * dtvs_state can only be NULL for helper enablings -- and
+		 * helper enablings can't be retained.
+		 */
+		ASSERT(enab->dten_vstate->dtvs_state != NULL);
+
+		if (enab->dten_vstate->dtvs_state != state)
+			continue;
+
+		/*
+		 * Now iterate over each probe description; we're looking for
+		 * an exact match to the specified probe description.
+		 */
+		for (i = 0; i < enab->dten_ndesc; i++) {
+			dtrace_ecbdesc_t *ep = enab->dten_desc[i];
+			dtrace_probedesc_t *pd = &ep->dted_probe;
+
+			if (strcmp(pd->dtpd_provider, match->dtpd_provider))
+				continue;
+
+			if (strcmp(pd->dtpd_mod, match->dtpd_mod))
+				continue;
+
+			if (strcmp(pd->dtpd_func, match->dtpd_func))
+				continue;
+
+			if (strcmp(pd->dtpd_name, match->dtpd_name))
+				continue;
+
+			/*
+			 * We have a winning probe!  Add it to our growing
+			 * enabling.
+			 */
+			found = 1;
+			dtrace_enabling_addlike(new, ep, create);
+		}
+	}
+
+	if (!found || (err = dtrace_enabling_retain(new)) != 0) {
+		dtrace_enabling_destroy(new);
+		return (err);
+	}
+
+	return (0);
+}
+
+static void
+dtrace_enabling_retract(dtrace_state_t *state)
+{
+	dtrace_enabling_t *enab, *next;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+
+	/*
+	 * Iterate over all retained enablings, destroy the enablings retained
+	 * for the specified state.
+	 */
+	for (enab = dtrace_retained; enab != NULL; enab = next) {
+		next = enab->dten_next;
+
+		/*
+		 * dtvs_state can only be NULL for helper enablings -- and
+		 * helper enablings can't be retained.
+		 */
+		ASSERT(enab->dten_vstate->dtvs_state != NULL);
+
+		if (enab->dten_vstate->dtvs_state == state) {
+			ASSERT(state->dts_nretained > 0);
+			dtrace_enabling_destroy(enab);
+		}
+	}
+
+	ASSERT(state->dts_nretained == 0);
+}
+
+static int
+dtrace_enabling_match(dtrace_enabling_t *enab, int *nmatched)
+{
+	int i = 0;
+	int matched = 0;
+
+	ASSERT(MUTEX_HELD(&cpu_lock));
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+
+	for (i = 0; i < enab->dten_ndesc; i++) {
+		dtrace_ecbdesc_t *ep = enab->dten_desc[i];
+
+		enab->dten_current = ep;
+		enab->dten_error = 0;
+
+		matched += dtrace_probe_enable(&ep->dted_probe, enab);
+
+		if (enab->dten_error != 0) {
+			/*
+			 * If we get an error half-way through enabling the
+			 * probes, we kick out -- perhaps with some number of
+			 * them enabled.  Leaving enabled probes enabled may
+			 * be slightly confusing for user-level, but we expect
+			 * that no one will attempt to actually drive on in
+			 * the face of such errors.  If this is an anonymous
+			 * enabling (indicated with a NULL nmatched pointer),
+			 * we cmn_err() a message.  We aren't expecting to
+			 * get such an error -- such as it can exist at all,
+			 * it would be a result of corrupted DOF in the driver
+			 * properties.
+			 */
+			if (nmatched == NULL) {
+				cmn_err(CE_WARN, "dtrace_enabling_match() "
+				    "error on %p: %d", (void *)ep,
+				    enab->dten_error);
+			}
+
+			return (enab->dten_error);
+		}
+	}
+
+	enab->dten_probegen = dtrace_probegen;
+	if (nmatched != NULL)
+		*nmatched = matched;
+
+	return (0);
+}
+
+static void
+dtrace_enabling_matchall(void)
+{
+	dtrace_enabling_t *enab;
+
+	mutex_enter(&cpu_lock);
+	mutex_enter(&dtrace_lock);
+
+	/*
+	 * Because we can be called after dtrace_detach() has been called, we
+	 * cannot assert that there are retained enablings.  We can safely
+	 * load from dtrace_retained, however:  the taskq_destroy() at the
+	 * end of dtrace_detach() will block pending our completion.
+	 */
+	for (enab = dtrace_retained; enab != NULL; enab = enab->dten_next)
+		(void) dtrace_enabling_match(enab, NULL);
+
+	mutex_exit(&dtrace_lock);
+	mutex_exit(&cpu_lock);
+}
+
+static int
+dtrace_enabling_matchstate(dtrace_state_t *state, int *nmatched)
+{
+	dtrace_enabling_t *enab;
+	int matched, total = 0, err;
+
+	ASSERT(MUTEX_HELD(&cpu_lock));
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+
+	for (enab = dtrace_retained; enab != NULL; enab = enab->dten_next) {
+		ASSERT(enab->dten_vstate->dtvs_state != NULL);
+
+		if (enab->dten_vstate->dtvs_state != state)
+			continue;
+
+		if ((err = dtrace_enabling_match(enab, &matched)) != 0)
+			return (err);
+
+		total += matched;
+	}
+
+	if (nmatched != NULL)
+		*nmatched = total;
+
+	return (0);
+}
+
+/*
+ * If an enabling is to be enabled without having matched probes (that is, if
+ * dtrace_state_go() is to be called on the underlying dtrace_state_t), the
+ * enabling must be _primed_ by creating an ECB for every ECB description.
+ * This must be done to assure that we know the number of speculations, the
+ * number of aggregations, the minimum buffer size needed, etc. before we
+ * transition out of DTRACE_ACTIVITY_INACTIVE.  To do this without actually
+ * enabling any probes, we create ECBs for every ECB decription, but with a
+ * NULL probe -- which is exactly what this function does.
+ */
+static void
+dtrace_enabling_prime(dtrace_state_t *state)
+{
+	dtrace_enabling_t *enab;
+	int i;
+
+	for (enab = dtrace_retained; enab != NULL; enab = enab->dten_next) {
+		ASSERT(enab->dten_vstate->dtvs_state != NULL);
+
+		if (enab->dten_vstate->dtvs_state != state)
+			continue;
+
+		/*
+		 * We don't want to prime an enabling more than once, lest
+		 * we allow a malicious user to induce resource exhaustion.
+		 * (The ECBs that result from priming an enabling aren't
+		 * leaked -- but they also aren't deallocated until the
+		 * consumer state is destroyed.)
+		 */
+		if (enab->dten_primed)
+			continue;
+
+		for (i = 0; i < enab->dten_ndesc; i++) {
+			enab->dten_current = enab->dten_desc[i];
+			(void) dtrace_probe_enable(NULL, enab);
+		}
+
+		enab->dten_primed = 1;
+	}
+}
+
+/*
+ * Called to indicate that probes should be provided due to retained
+ * enablings.  This is implemented in terms of dtrace_probe_provide(), but it
+ * must take an initial lap through the enabling calling the dtps_provide()
+ * entry point explicitly to allow for autocreated probes.
+ */
+static void
+dtrace_enabling_provide(dtrace_provider_t *prv)
+{
+	int i, all = 0;
+	dtrace_probedesc_t desc;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+	ASSERT(MUTEX_HELD(&dtrace_provider_lock));
+
+	if (prv == NULL) {
+		all = 1;
+		prv = dtrace_provider;
+	}
+
+	do {
+		dtrace_enabling_t *enab = dtrace_retained;
+		void *parg = prv->dtpv_arg;
+
+		for (; enab != NULL; enab = enab->dten_next) {
+			for (i = 0; i < enab->dten_ndesc; i++) {
+				desc = enab->dten_desc[i]->dted_probe;
+				mutex_exit(&dtrace_lock);
+				prv->dtpv_pops.dtps_provide(parg, &desc);
+				mutex_enter(&dtrace_lock);
+			}
+		}
+	} while (all && (prv = prv->dtpv_next) != NULL);
+
+	mutex_exit(&dtrace_lock);
+	dtrace_probe_provide(NULL, all ? NULL : prv);
+	mutex_enter(&dtrace_lock);
+}
+
+/*
+ * DTrace DOF Functions
+ */
+/*ARGSUSED*/
+static void
+dtrace_dof_error(dof_hdr_t *dof, const char *str)
+{
+	if (dtrace_err_verbose)
+		cmn_err(CE_WARN, "failed to process DOF: %s", str);
+
+#ifdef DTRACE_ERRDEBUG
+	dtrace_errdebug(str);
+#endif
+}
+
+/*
+ * Create DOF out of a currently enabled state.  Right now, we only create
+ * DOF containing the run-time options -- but this could be expanded to create
+ * complete DOF representing the enabled state.
+ */
+static dof_hdr_t *
+dtrace_dof_create(dtrace_state_t *state)
+{
+	dof_hdr_t *dof;
+	dof_sec_t *sec;
+	dof_optdesc_t *opt;
+	int i, len = sizeof (dof_hdr_t) +
+	    roundup(sizeof (dof_sec_t), sizeof (uint64_t)) +
+	    sizeof (dof_optdesc_t) * DTRACEOPT_MAX;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+
+	dof = kmem_zalloc(len, KM_SLEEP);
+	dof->dofh_ident[DOF_ID_MAG0] = DOF_MAG_MAG0;
+	dof->dofh_ident[DOF_ID_MAG1] = DOF_MAG_MAG1;
+	dof->dofh_ident[DOF_ID_MAG2] = DOF_MAG_MAG2;
+	dof->dofh_ident[DOF_ID_MAG3] = DOF_MAG_MAG3;
+
+	dof->dofh_ident[DOF_ID_MODEL] = DOF_MODEL_NATIVE;
+	dof->dofh_ident[DOF_ID_ENCODING] = DOF_ENCODE_NATIVE;
+	dof->dofh_ident[DOF_ID_VERSION] = DOF_VERSION;
+	dof->dofh_ident[DOF_ID_DIFVERS] = DIF_VERSION;
+	dof->dofh_ident[DOF_ID_DIFIREG] = DIF_DIR_NREGS;
+	dof->dofh_ident[DOF_ID_DIFTREG] = DIF_DTR_NREGS;
+
+	dof->dofh_flags = 0;
+	dof->dofh_hdrsize = sizeof (dof_hdr_t);
+	dof->dofh_secsize = sizeof (dof_sec_t);
+	dof->dofh_secnum = 1;	/* only DOF_SECT_OPTDESC */
+	dof->dofh_secoff = sizeof (dof_hdr_t);
+	dof->dofh_loadsz = len;
+	dof->dofh_filesz = len;
+	dof->dofh_pad = 0;
+
+	/*
+	 * Fill in the option section header...
+	 */
+	sec = (dof_sec_t *)((uintptr_t)dof + sizeof (dof_hdr_t));
+	sec->dofs_type = DOF_SECT_OPTDESC;
+	sec->dofs_align = sizeof (uint64_t);
+	sec->dofs_flags = DOF_SECF_LOAD;
+	sec->dofs_entsize = sizeof (dof_optdesc_t);
+
+	opt = (dof_optdesc_t *)((uintptr_t)sec +
+	    roundup(sizeof (dof_sec_t), sizeof (uint64_t)));
+
+	sec->dofs_offset = (uintptr_t)opt - (uintptr_t)dof;
+	sec->dofs_size = sizeof (dof_optdesc_t) * DTRACEOPT_MAX;
+
+	for (i = 0; i < DTRACEOPT_MAX; i++) {
+		opt[i].dofo_option = i;
+		opt[i].dofo_strtab = DOF_SECIDX_NONE;
+		opt[i].dofo_value = state->dts_options[i];
+	}
+
+	return (dof);
+}
+
+static dof_hdr_t *
+dtrace_dof_copyin(uintptr_t uarg, int *errp)
+{
+	dof_hdr_t hdr, *dof;
+
+	ASSERT(!MUTEX_HELD(&dtrace_lock));
+
+	/*
+	 * First, we're going to copyin() the sizeof (dof_hdr_t).
+	 */
+	if (copyin((void *)uarg, &hdr, sizeof (hdr)) != 0) {
+		dtrace_dof_error(NULL, "failed to copyin DOF header");
+		*errp = EFAULT;
+		return (NULL);
+	}
+
+	/*
+	 * Now we'll allocate the entire DOF and copy it in -- provided
+	 * that the length isn't outrageous.
+	 */
+	if (hdr.dofh_loadsz >= dtrace_dof_maxsize) {
+		dtrace_dof_error(&hdr, "load size exceeds maximum");
+		*errp = E2BIG;
+		return (NULL);
+	}
+
+	if (hdr.dofh_loadsz < sizeof (hdr)) {
+		dtrace_dof_error(&hdr, "invalid load size");
+		*errp = EINVAL;
+		return (NULL);
+	}
+
+	dof = kmem_alloc(hdr.dofh_loadsz, KM_SLEEP);
+
+	if (copyin((void *)uarg, dof, hdr.dofh_loadsz) != 0) {
+		kmem_free(dof, hdr.dofh_loadsz);
+		*errp = EFAULT;
+		return (NULL);
+	}
+
+	return (dof);
+}
+
+static dof_hdr_t *
+dtrace_dof_property(const char *name)
+{
+	uchar_t *buf;
+	uint64_t loadsz;
+	unsigned int len, i;
+	dof_hdr_t *dof;
+
+	/*
+	 * Unfortunately, array of values in .conf files are always (and
+	 * only) interpreted to be integer arrays.  We must read our DOF
+	 * as an integer array, and then squeeze it into a byte array.
+	 */
+	if (ddi_prop_lookup_int_array(DDI_DEV_T_ANY, dtrace_devi, 0,
+	    (char *)name, (int **)&buf, &len) != DDI_PROP_SUCCESS)
+		return (NULL);
+
+	for (i = 0; i < len; i++)
+		buf[i] = (uchar_t)(((int *)buf)[i]);
+
+	if (len < sizeof (dof_hdr_t)) {
+		ddi_prop_free(buf);
+		dtrace_dof_error(NULL, "truncated header");
+		return (NULL);
+	}
+
+	if (len < (loadsz = ((dof_hdr_t *)buf)->dofh_loadsz)) {
+		ddi_prop_free(buf);
+		dtrace_dof_error(NULL, "truncated DOF");
+		return (NULL);
+	}
+
+	if (loadsz >= dtrace_dof_maxsize) {
+		ddi_prop_free(buf);
+		dtrace_dof_error(NULL, "oversized DOF");
+		return (NULL);
+	}
+
+	dof = kmem_alloc(loadsz, KM_SLEEP);
+	bcopy(buf, dof, loadsz);
+	ddi_prop_free(buf);
+
+	return (dof);
+}
+
+static void
+dtrace_dof_destroy(dof_hdr_t *dof)
+{
+	kmem_free(dof, dof->dofh_loadsz);
+}
+
+/*
+ * Return the dof_sec_t pointer corresponding to a given section index.  If the
+ * index is not valid, dtrace_dof_error() is called and NULL is returned.  If
+ * a type other than DOF_SECT_NONE is specified, the header is checked against
+ * this type and NULL is returned if the types do not match.
+ */
+static dof_sec_t *
+dtrace_dof_sect(dof_hdr_t *dof, uint32_t type, dof_secidx_t i)
+{
+	dof_sec_t *sec = (dof_sec_t *)(uintptr_t)
+	    ((uintptr_t)dof + dof->dofh_secoff + i * dof->dofh_secsize);
+
+	if (i >= dof->dofh_secnum) {
+		dtrace_dof_error(dof, "referenced section index is invalid");
+		return (NULL);
+	}
+
+	if (!(sec->dofs_flags & DOF_SECF_LOAD)) {
+		dtrace_dof_error(dof, "referenced section is not loadable");
+		return (NULL);
+	}
+
+	if (type != DOF_SECT_NONE && type != sec->dofs_type) {
+		dtrace_dof_error(dof, "referenced section is the wrong type");
+		return (NULL);
+	}
+
+	return (sec);
+}
+
+static dtrace_probedesc_t *
+dtrace_dof_probedesc(dof_hdr_t *dof, dof_sec_t *sec, dtrace_probedesc_t *desc)
+{
+	dof_probedesc_t *probe;
+	dof_sec_t *strtab;
+	uintptr_t daddr = (uintptr_t)dof;
+	uintptr_t str;
+	size_t size;
+
+	if (sec->dofs_type != DOF_SECT_PROBEDESC) {
+		dtrace_dof_error(dof, "invalid probe section");
+		return (NULL);
+	}
+
+	if (sec->dofs_align != sizeof (dof_secidx_t)) {
+		dtrace_dof_error(dof, "bad alignment in probe description");
+		return (NULL);
+	}
+
+	if (sec->dofs_offset + sizeof (dof_probedesc_t) > dof->dofh_loadsz) {
+		dtrace_dof_error(dof, "truncated probe description");
+		return (NULL);
+	}
+
+	probe = (dof_probedesc_t *)(uintptr_t)(daddr + sec->dofs_offset);
+	strtab = dtrace_dof_sect(dof, DOF_SECT_STRTAB, probe->dofp_strtab);
+
+	if (strtab == NULL)
+		return (NULL);
+
+	str = daddr + strtab->dofs_offset;
+	size = strtab->dofs_size;
+
+	if (probe->dofp_provider >= strtab->dofs_size) {
+		dtrace_dof_error(dof, "corrupt probe provider");
+		return (NULL);
+	}
+
+	(void) strncpy(desc->dtpd_provider,
+	    (char *)(str + probe->dofp_provider),
+	    MIN(DTRACE_PROVNAMELEN - 1, size - probe->dofp_provider));
+
+	if (probe->dofp_mod >= strtab->dofs_size) {
+		dtrace_dof_error(dof, "corrupt probe module");
+		return (NULL);
+	}
+
+	(void) strncpy(desc->dtpd_mod, (char *)(str + probe->dofp_mod),
+	    MIN(DTRACE_MODNAMELEN - 1, size - probe->dofp_mod));
+
+	if (probe->dofp_func >= strtab->dofs_size) {
+		dtrace_dof_error(dof, "corrupt probe function");
+		return (NULL);
+	}
+
+	(void) strncpy(desc->dtpd_func, (char *)(str + probe->dofp_func),
+	    MIN(DTRACE_FUNCNAMELEN - 1, size - probe->dofp_func));
+
+	if (probe->dofp_name >= strtab->dofs_size) {
+		dtrace_dof_error(dof, "corrupt probe name");
+		return (NULL);
+	}
+
+	(void) strncpy(desc->dtpd_name, (char *)(str + probe->dofp_name),
+	    MIN(DTRACE_NAMELEN - 1, size - probe->dofp_name));
+
+	return (desc);
+}
+
+static dtrace_difo_t *
+dtrace_dof_difo(dof_hdr_t *dof, dof_sec_t *sec, dtrace_vstate_t *vstate,
+    cred_t *cr)
+{
+	dtrace_difo_t *dp;
+	size_t ttl = 0;
+	dof_difohdr_t *dofd;
+	uintptr_t daddr = (uintptr_t)dof;
+	size_t max = dtrace_difo_maxsize;
+	int i, l, n;
+
+	static const struct {
+		int section;
+		int bufoffs;
+		int lenoffs;
+		int entsize;
+		int align;
+		const char *msg;
+	} difo[] = {
+		{ DOF_SECT_DIF, offsetof(dtrace_difo_t, dtdo_buf),
+		offsetof(dtrace_difo_t, dtdo_len), sizeof (dif_instr_t),
+		sizeof (dif_instr_t), "multiple DIF sections" },
+
+		{ DOF_SECT_INTTAB, offsetof(dtrace_difo_t, dtdo_inttab),
+		offsetof(dtrace_difo_t, dtdo_intlen), sizeof (uint64_t),
+		sizeof (uint64_t), "multiple integer tables" },
+
+		{ DOF_SECT_STRTAB, offsetof(dtrace_difo_t, dtdo_strtab),
+		offsetof(dtrace_difo_t, dtdo_strlen), 0,
+		sizeof (char), "multiple string tables" },
+
+		{ DOF_SECT_VARTAB, offsetof(dtrace_difo_t, dtdo_vartab),
+		offsetof(dtrace_difo_t, dtdo_varlen), sizeof (dtrace_difv_t),
+		sizeof (uint_t), "multiple variable tables" },
+
+		{ DOF_SECT_NONE, 0, 0, 0, NULL }
+	};
+
+	if (sec->dofs_type != DOF_SECT_DIFOHDR) {
+		dtrace_dof_error(dof, "invalid DIFO header section");
+		return (NULL);
+	}
+
+	if (sec->dofs_align != sizeof (dof_secidx_t)) {
+		dtrace_dof_error(dof, "bad alignment in DIFO header");
+		return (NULL);
+	}
+
+	if (sec->dofs_size < sizeof (dof_difohdr_t) ||
+	    sec->dofs_size % sizeof (dof_secidx_t)) {
+		dtrace_dof_error(dof, "bad size in DIFO header");
+		return (NULL);
+	}
+
+	dofd = (dof_difohdr_t *)(uintptr_t)(daddr + sec->dofs_offset);
+	n = (sec->dofs_size - sizeof (*dofd)) / sizeof (dof_secidx_t) + 1;
+
+	dp = kmem_zalloc(sizeof (dtrace_difo_t), KM_SLEEP);
+	dp->dtdo_rtype = dofd->dofd_rtype;
+
+	for (l = 0; l < n; l++) {
+		dof_sec_t *subsec;
+		void **bufp;
+		uint32_t *lenp;
+
+		if ((subsec = dtrace_dof_sect(dof, DOF_SECT_NONE,
+		    dofd->dofd_links[l])) == NULL)
+			goto err; /* invalid section link */
+
+		if (ttl + subsec->dofs_size > max) {
+			dtrace_dof_error(dof, "exceeds maximum size");
+			goto err;
+		}
+
+		ttl += subsec->dofs_size;
+
+		for (i = 0; difo[i].section != DOF_SECT_NONE; i++) {
+			if (subsec->dofs_type != difo[i].section)
+				continue;
+
+			if (!(subsec->dofs_flags & DOF_SECF_LOAD)) {
+				dtrace_dof_error(dof, "section not loaded");
+				goto err;
+			}
+
+			if (subsec->dofs_align != difo[i].align) {
+				dtrace_dof_error(dof, "bad alignment");
+				goto err;
+			}
+
+			bufp = (void **)((uintptr_t)dp + difo[i].bufoffs);
+			lenp = (uint32_t *)((uintptr_t)dp + difo[i].lenoffs);
+
+			if (*bufp != NULL) {
+				dtrace_dof_error(dof, difo[i].msg);
+				goto err;
+			}
+
+			if (difo[i].entsize != subsec->dofs_entsize) {
+				dtrace_dof_error(dof, "entry size mismatch");
+				goto err;
+			}
+
+			if (subsec->dofs_entsize != 0 &&
+			    (subsec->dofs_size % subsec->dofs_entsize) != 0) {
+				dtrace_dof_error(dof, "corrupt entry size");
+				goto err;
+			}
+
+			*lenp = subsec->dofs_size;
+			*bufp = kmem_alloc(subsec->dofs_size, KM_SLEEP);
+			bcopy((char *)(uintptr_t)(daddr + subsec->dofs_offset),
+			    *bufp, subsec->dofs_size);
+
+			if (subsec->dofs_entsize != 0)
+				*lenp /= subsec->dofs_entsize;
+
+			break;
+		}
+
+		/*
+		 * If we encounter a loadable DIFO sub-section that is not
+		 * known to us, assume this is a broken program and fail.
+		 */
+		if (difo[i].section == DOF_SECT_NONE &&
+		    (subsec->dofs_flags & DOF_SECF_LOAD)) {
+			dtrace_dof_error(dof, "unrecognized DIFO subsection");
+			goto err;
+		}
+	}
+
+	if (dp->dtdo_buf == NULL) {
+		/*
+		 * We can't have a DIF object without DIF text.
+		 */
+		dtrace_dof_error(dof, "missing DIF text");
+		goto err;
+	}
+
+	/*
+	 * Before we validate the DIF object, run through the variable table
+	 * looking for the strings -- if any of their size are under, we'll set
+	 * their size to be the system-wide default string size.  Note that
+	 * this should _not_ happen if the "strsize" option has been set --
+	 * in this case, the compiler should have set the size to reflect the
+	 * setting of the option.
+	 */
+	for (i = 0; i < dp->dtdo_varlen; i++) {
+		dtrace_difv_t *v = &dp->dtdo_vartab[i];
+		dtrace_diftype_t *t = &v->dtdv_type;
+
+		if (v->dtdv_id < DIF_VAR_OTHER_UBASE)
+			continue;
+
+		if (t->dtdt_kind == DIF_TYPE_STRING && t->dtdt_size == 0)
+			t->dtdt_size = dtrace_strsize_default;
+	}
+
+	if (dtrace_difo_validate(dp, vstate, DIF_DIR_NREGS, cr) != 0)
+		goto err;
+
+	dtrace_difo_init(dp, vstate);
+	return (dp);
+
+err:
+	kmem_free(dp->dtdo_buf, dp->dtdo_len * sizeof (dif_instr_t));
+	kmem_free(dp->dtdo_inttab, dp->dtdo_intlen * sizeof (uint64_t));
+	kmem_free(dp->dtdo_strtab, dp->dtdo_strlen);
+	kmem_free(dp->dtdo_vartab, dp->dtdo_varlen * sizeof (dtrace_difv_t));
+
+	kmem_free(dp, sizeof (dtrace_difo_t));
+	return (NULL);
+}
+
+static dtrace_predicate_t *
+dtrace_dof_predicate(dof_hdr_t *dof, dof_sec_t *sec, dtrace_vstate_t *vstate,
+    cred_t *cr)
+{
+	dtrace_difo_t *dp;
+
+	if ((dp = dtrace_dof_difo(dof, sec, vstate, cr)) == NULL)
+		return (NULL);
+
+	return (dtrace_predicate_create(dp));
+}
+
+static dtrace_actdesc_t *
+dtrace_dof_actdesc(dof_hdr_t *dof, dof_sec_t *sec, dtrace_vstate_t *vstate,
+    cred_t *cr)
+{
+	dtrace_actdesc_t *act, *first = NULL, *last = NULL, *next;
+	dof_actdesc_t *desc;
+	dof_sec_t *difosec;
+	size_t offs;
+	uintptr_t daddr = (uintptr_t)dof;
+	uint64_t arg;
+	dtrace_actkind_t kind;
+
+	if (sec->dofs_type != DOF_SECT_ACTDESC) {
+		dtrace_dof_error(dof, "invalid action section");
+		return (NULL);
+	}
+
+	if (sec->dofs_offset + sizeof (dof_actdesc_t) > dof->dofh_loadsz) {
+		dtrace_dof_error(dof, "truncated action description");
+		return (NULL);
+	}
+
+	if (sec->dofs_align != sizeof (uint64_t)) {
+		dtrace_dof_error(dof, "bad alignment in action description");
+		return (NULL);
+	}
+
+	if (sec->dofs_size < sec->dofs_entsize) {
+		dtrace_dof_error(dof, "section entry size exceeds total size");
+		return (NULL);
+	}
+
+	if (sec->dofs_entsize != sizeof (dof_actdesc_t)) {
+		dtrace_dof_error(dof, "bad entry size in action description");
+		return (NULL);
+	}
+
+	if (sec->dofs_size / sec->dofs_entsize > dtrace_actions_max) {
+		dtrace_dof_error(dof, "actions exceed dtrace_actions_max");
+		return (NULL);
+	}
+
+	for (offs = 0; offs < sec->dofs_size; offs += sec->dofs_entsize) {
+		desc = (dof_actdesc_t *)(daddr +
+		    (uintptr_t)sec->dofs_offset + offs);
+		kind = (dtrace_actkind_t)desc->dofa_kind;
+
+		if (DTRACEACT_ISPRINTFLIKE(kind) &&
+		    (kind != DTRACEACT_PRINTA ||
+		    desc->dofa_strtab != DOF_SECIDX_NONE)) {
+			dof_sec_t *strtab;
+			char *str, *fmt;
+			uint64_t i;
+
+			/*
+			 * printf()-like actions must have a format string.
+			 */
+			if ((strtab = dtrace_dof_sect(dof,
+			    DOF_SECT_STRTAB, desc->dofa_strtab)) == NULL)
+				goto err;
+
+			str = (char *)((uintptr_t)dof +
+			    (uintptr_t)strtab->dofs_offset);
+
+			for (i = desc->dofa_arg; i < strtab->dofs_size; i++) {
+				if (str[i] == '\0')
+					break;
+			}
+
+			if (i >= strtab->dofs_size) {
+				dtrace_dof_error(dof, "bogus format string");
+				goto err;
+			}
+
+			if (i == desc->dofa_arg) {
+				dtrace_dof_error(dof, "empty format string");
+				goto err;
+			}
+
+			i -= desc->dofa_arg;
+			fmt = kmem_alloc(i + 1, KM_SLEEP);
+			bcopy(&str[desc->dofa_arg], fmt, i + 1);
+			arg = (uint64_t)(uintptr_t)fmt;
+		} else {
+			if (kind == DTRACEACT_PRINTA) {
+				ASSERT(desc->dofa_strtab == DOF_SECIDX_NONE);
+				arg = 0;
+			} else {
+				arg = desc->dofa_arg;
+			}
+		}
+
+		act = dtrace_actdesc_create(kind, desc->dofa_ntuple,
+		    desc->dofa_uarg, arg);
+
+		if (last != NULL) {
+			last->dtad_next = act;
+		} else {
+			first = act;
+		}
+
+		last = act;
+
+		if (desc->dofa_difo == DOF_SECIDX_NONE)
+			continue;
+
+		if ((difosec = dtrace_dof_sect(dof,
+		    DOF_SECT_DIFOHDR, desc->dofa_difo)) == NULL)
+			goto err;
+
+		act->dtad_difo = dtrace_dof_difo(dof, difosec, vstate, cr);
+
+		if (act->dtad_difo == NULL)
+			goto err;
+	}
+
+	ASSERT(first != NULL);
+	return (first);
+
+err:
+	for (act = first; act != NULL; act = next) {
+		next = act->dtad_next;
+		dtrace_actdesc_release(act, vstate);
+	}
+
+	return (NULL);
+}
+
+static dtrace_ecbdesc_t *
+dtrace_dof_ecbdesc(dof_hdr_t *dof, dof_sec_t *sec, dtrace_vstate_t *vstate,
+    cred_t *cr)
+{
+	dtrace_ecbdesc_t *ep;
+	dof_ecbdesc_t *ecb;
+	dtrace_probedesc_t *desc;
+	dtrace_predicate_t *pred = NULL;
+
+	if (sec->dofs_size < sizeof (dof_ecbdesc_t)) {
+		dtrace_dof_error(dof, "truncated ECB description");
+		return (NULL);
+	}
+
+	if (sec->dofs_align != sizeof (uint64_t)) {
+		dtrace_dof_error(dof, "bad alignment in ECB description");
+		return (NULL);
+	}
+
+	ecb = (dof_ecbdesc_t *)((uintptr_t)dof + (uintptr_t)sec->dofs_offset);
+	sec = dtrace_dof_sect(dof, DOF_SECT_PROBEDESC, ecb->dofe_probes);
+
+	if (sec == NULL)
+		return (NULL);
+
+	ep = kmem_zalloc(sizeof (dtrace_ecbdesc_t), KM_SLEEP);
+	ep->dted_uarg = ecb->dofe_uarg;
+	desc = &ep->dted_probe;
+
+	if (dtrace_dof_probedesc(dof, sec, desc) == NULL)
+		goto err;
+
+	if (ecb->dofe_pred != DOF_SECIDX_NONE) {
+		if ((sec = dtrace_dof_sect(dof,
+		    DOF_SECT_DIFOHDR, ecb->dofe_pred)) == NULL)
+			goto err;
+
+		if ((pred = dtrace_dof_predicate(dof, sec, vstate, cr)) == NULL)
+			goto err;
+
+		ep->dted_pred.dtpdd_predicate = pred;
+	}
+
+	if (ecb->dofe_actions != DOF_SECIDX_NONE) {
+		if ((sec = dtrace_dof_sect(dof,
+		    DOF_SECT_ACTDESC, ecb->dofe_actions)) == NULL)
+			goto err;
+
+		ep->dted_action = dtrace_dof_actdesc(dof, sec, vstate, cr);
+
+		if (ep->dted_action == NULL)
+			goto err;
+	}
+
+	return (ep);
+
+err:
+	if (pred != NULL)
+		dtrace_predicate_release(pred, vstate);
+	kmem_free(ep, sizeof (dtrace_ecbdesc_t));
+	return (NULL);
+}
+
+/*
+ * Apply the relocations from the specified 'sec' (a DOF_SECT_URELHDR) to the
+ * specified DOF.  At present, this amounts to simply adding 'ubase' to the
+ * site of any user SETX relocations to account for load object base address.
+ * In the future, if we need other relocations, this function can be extended.
+ */
+static int
+dtrace_dof_relocate(dof_hdr_t *dof, dof_sec_t *sec, uint64_t ubase)
+{
+	uintptr_t daddr = (uintptr_t)dof;
+	dof_relohdr_t *dofr =
+	    (dof_relohdr_t *)(uintptr_t)(daddr + sec->dofs_offset);
+	dof_sec_t *ss, *rs, *ts;
+	dof_relodesc_t *r;
+	uint_t i, n;
+
+	if (sec->dofs_size < sizeof (dof_relohdr_t) ||
+	    sec->dofs_align != sizeof (dof_secidx_t)) {
+		dtrace_dof_error(dof, "invalid relocation header");
+		return (-1);
+	}
+
+	ss = dtrace_dof_sect(dof, DOF_SECT_STRTAB, dofr->dofr_strtab);
+	rs = dtrace_dof_sect(dof, DOF_SECT_RELTAB, dofr->dofr_relsec);
+	ts = dtrace_dof_sect(dof, DOF_SECT_NONE, dofr->dofr_tgtsec);
+
+	if (ss == NULL || rs == NULL || ts == NULL)
+		return (-1); /* dtrace_dof_error() has been called already */
+
+	if (rs->dofs_entsize < sizeof (dof_relodesc_t) ||
+	    rs->dofs_align != sizeof (uint64_t)) {
+		dtrace_dof_error(dof, "invalid relocation section");
+		return (-1);
+	}
+
+	r = (dof_relodesc_t *)(uintptr_t)(daddr + rs->dofs_offset);
+	n = rs->dofs_size / rs->dofs_entsize;
+
+	for (i = 0; i < n; i++) {
+		uintptr_t taddr = daddr + ts->dofs_offset + r->dofr_offset;
+
+		switch (r->dofr_type) {
+		case DOF_RELO_NONE:
+			break;
+		case DOF_RELO_SETX:
+			if (r->dofr_offset >= ts->dofs_size || r->dofr_offset +
+			    sizeof (uint64_t) > ts->dofs_size) {
+				dtrace_dof_error(dof, "bad relocation offset");
+				return (-1);
+			}
+
+			if (!IS_P2ALIGNED(taddr, sizeof (uint64_t))) {
+				dtrace_dof_error(dof, "misaligned setx relo");
+				return (-1);
+			}
+
+			*(uint64_t *)taddr += ubase;
+			break;
+		default:
+			dtrace_dof_error(dof, "invalid relocation type");
+			return (-1);
+		}
+
+		r = (dof_relodesc_t *)((uintptr_t)r + rs->dofs_entsize);
+	}
+
+	return (0);
+}
+
+/*
+ * The dof_hdr_t passed to dtrace_dof_slurp() should be a partially validated
+ * header:  it should be at the front of a memory region that is at least
+ * sizeof (dof_hdr_t) in size -- and then at least dof_hdr.dofh_loadsz in
+ * size.  It need not be validated in any other way.
+ */
+static int
+dtrace_dof_slurp(dof_hdr_t *dof, dtrace_vstate_t *vstate, cred_t *cr,
+    dtrace_enabling_t **enabp, uint64_t ubase, int noprobes)
+{
+	uint64_t len = dof->dofh_loadsz, seclen;
+	uintptr_t daddr = (uintptr_t)dof;
+	dtrace_ecbdesc_t *ep;
+	dtrace_enabling_t *enab;
+	uint_t i;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+	ASSERT(dof->dofh_loadsz >= sizeof (dof_hdr_t));
+
+	/*
+	 * Check the DOF header identification bytes.  In addition to checking
+	 * valid settings, we also verify that unused bits/bytes are zeroed so
+	 * we can use them later without fear of regressing existing binaries.
+	 */
+	if (bcmp(&dof->dofh_ident[DOF_ID_MAG0],
+	    DOF_MAG_STRING, DOF_MAG_STRLEN) != 0) {
+		dtrace_dof_error(dof, "DOF magic string mismatch");
+		return (-1);
+	}
+
+	if (dof->dofh_ident[DOF_ID_MODEL] != DOF_MODEL_ILP32 &&
+	    dof->dofh_ident[DOF_ID_MODEL] != DOF_MODEL_LP64) {
+		dtrace_dof_error(dof, "DOF has invalid data model");
+		return (-1);
+	}
+
+	if (dof->dofh_ident[DOF_ID_ENCODING] != DOF_ENCODE_NATIVE) {
+		dtrace_dof_error(dof, "DOF encoding mismatch");
+		return (-1);
+	}
+
+	if (dof->dofh_ident[DOF_ID_VERSION] != DOF_VERSION_1 &&
+	    dof->dofh_ident[DOF_ID_VERSION] != DOF_VERSION_2) {
+		dtrace_dof_error(dof, "DOF version mismatch");
+		return (-1);
+	}
+
+	if (dof->dofh_ident[DOF_ID_DIFVERS] != DIF_VERSION_2) {
+		dtrace_dof_error(dof, "DOF uses unsupported instruction set");
+		return (-1);
+	}
+
+	if (dof->dofh_ident[DOF_ID_DIFIREG] > DIF_DIR_NREGS) {
+		dtrace_dof_error(dof, "DOF uses too many integer registers");
+		return (-1);
+	}
+
+	if (dof->dofh_ident[DOF_ID_DIFTREG] > DIF_DTR_NREGS) {
+		dtrace_dof_error(dof, "DOF uses too many tuple registers");
+		return (-1);
+	}
+
+	for (i = DOF_ID_PAD; i < DOF_ID_SIZE; i++) {
+		if (dof->dofh_ident[i] != 0) {
+			dtrace_dof_error(dof, "DOF has invalid ident byte set");
+			return (-1);
+		}
+	}
+
+	if (dof->dofh_flags & ~DOF_FL_VALID) {
+		dtrace_dof_error(dof, "DOF has invalid flag bits set");
+		return (-1);
+	}
+
+	if (dof->dofh_secsize == 0) {
+		dtrace_dof_error(dof, "zero section header size");
+		return (-1);
+	}
+
+	/*
+	 * Check that the section headers don't exceed the amount of DOF
+	 * data.  Note that we cast the section size and number of sections
+	 * to uint64_t's to prevent possible overflow in the multiplication.
+	 */
+	seclen = (uint64_t)dof->dofh_secnum * (uint64_t)dof->dofh_secsize;
+
+	if (dof->dofh_secoff > len || seclen > len ||
+	    dof->dofh_secoff + seclen > len) {
+		dtrace_dof_error(dof, "truncated section headers");
+		return (-1);
+	}
+
+	if (!IS_P2ALIGNED(dof->dofh_secoff, sizeof (uint64_t))) {
+		dtrace_dof_error(dof, "misaligned section headers");
+		return (-1);
+	}
+
+	if (!IS_P2ALIGNED(dof->dofh_secsize, sizeof (uint64_t))) {
+		dtrace_dof_error(dof, "misaligned section size");
+		return (-1);
+	}
+
+	/*
+	 * Take an initial pass through the section headers to be sure that
+	 * the headers don't have stray offsets.  If the 'noprobes' flag is
+	 * set, do not permit sections relating to providers, probes, or args.
+	 */
+	for (i = 0; i < dof->dofh_secnum; i++) {
+		dof_sec_t *sec = (dof_sec_t *)(daddr +
+		    (uintptr_t)dof->dofh_secoff + i * dof->dofh_secsize);
+
+		if (noprobes) {
+			switch (sec->dofs_type) {
+			case DOF_SECT_PROVIDER:
+			case DOF_SECT_PROBES:
+			case DOF_SECT_PRARGS:
+			case DOF_SECT_PROFFS:
+				dtrace_dof_error(dof, "illegal sections "
+				    "for enabling");
+				return (-1);
+			}
+		}
+
+		if (!(sec->dofs_flags & DOF_SECF_LOAD))
+			continue; /* just ignore non-loadable sections */
+
+		if (sec->dofs_align & (sec->dofs_align - 1)) {
+			dtrace_dof_error(dof, "bad section alignment");
+			return (-1);
+		}
+
+		if (sec->dofs_offset & (sec->dofs_align - 1)) {
+			dtrace_dof_error(dof, "misaligned section");
+			return (-1);
+		}
+
+		if (sec->dofs_offset > len || sec->dofs_size > len ||
+		    sec->dofs_offset + sec->dofs_size > len) {
+			dtrace_dof_error(dof, "corrupt section header");
+			return (-1);
+		}
+
+		if (sec->dofs_type == DOF_SECT_STRTAB && *((char *)daddr +
+		    sec->dofs_offset + sec->dofs_size - 1) != '\0') {
+			dtrace_dof_error(dof, "non-terminating string table");
+			return (-1);
+		}
+	}
+
+	/*
+	 * Take a second pass through the sections and locate and perform any
+	 * relocations that are present.  We do this after the first pass to
+	 * be sure that all sections have had their headers validated.
+	 */
+	for (i = 0; i < dof->dofh_secnum; i++) {
+		dof_sec_t *sec = (dof_sec_t *)(daddr +
+		    (uintptr_t)dof->dofh_secoff + i * dof->dofh_secsize);
+
+		if (!(sec->dofs_flags & DOF_SECF_LOAD))
+			continue; /* skip sections that are not loadable */
+
+		switch (sec->dofs_type) {
+		case DOF_SECT_URELHDR:
+			if (dtrace_dof_relocate(dof, sec, ubase) != 0)
+				return (-1);
+			break;
+		}
+	}
+
+	if ((enab = *enabp) == NULL)
+		enab = *enabp = dtrace_enabling_create(vstate);
+
+	for (i = 0; i < dof->dofh_secnum; i++) {
+		dof_sec_t *sec = (dof_sec_t *)(daddr +
+		    (uintptr_t)dof->dofh_secoff + i * dof->dofh_secsize);
+
+		if (sec->dofs_type != DOF_SECT_ECBDESC)
+			continue;
+
+		if ((ep = dtrace_dof_ecbdesc(dof, sec, vstate, cr)) == NULL) {
+			dtrace_enabling_destroy(enab);
+			*enabp = NULL;
+			return (-1);
+		}
+
+		dtrace_enabling_add(enab, ep);
+	}
+
+	return (0);
+}
+
+/*
+ * Process DOF for any options.  This routine assumes that the DOF has been
+ * at least processed by dtrace_dof_slurp().
+ */
+static int
+dtrace_dof_options(dof_hdr_t *dof, dtrace_state_t *state)
+{
+	int i, rval;
+	uint32_t entsize;
+	size_t offs;
+	dof_optdesc_t *desc;
+
+	for (i = 0; i < dof->dofh_secnum; i++) {
+		dof_sec_t *sec = (dof_sec_t *)((uintptr_t)dof +
+		    (uintptr_t)dof->dofh_secoff + i * dof->dofh_secsize);
+
+		if (sec->dofs_type != DOF_SECT_OPTDESC)
+			continue;
+
+		if (sec->dofs_align != sizeof (uint64_t)) {
+			dtrace_dof_error(dof, "bad alignment in "
+			    "option description");
+			return (EINVAL);
+		}
+
+		if ((entsize = sec->dofs_entsize) == 0) {
+			dtrace_dof_error(dof, "zeroed option entry size");
+			return (EINVAL);
+		}
+
+		if (entsize < sizeof (dof_optdesc_t)) {
+			dtrace_dof_error(dof, "bad option entry size");
+			return (EINVAL);
+		}
+
+		for (offs = 0; offs < sec->dofs_size; offs += entsize) {
+			desc = (dof_optdesc_t *)((uintptr_t)dof +
+			    (uintptr_t)sec->dofs_offset + offs);
+
+			if (desc->dofo_strtab != DOF_SECIDX_NONE) {
+				dtrace_dof_error(dof, "non-zero option string");
+				return (EINVAL);
+			}
+
+			if (desc->dofo_value == DTRACEOPT_UNSET) {
+				dtrace_dof_error(dof, "unset option");
+				return (EINVAL);
+			}
+
+			if ((rval = dtrace_state_option(state,
+			    desc->dofo_option, desc->dofo_value)) != 0) {
+				dtrace_dof_error(dof, "rejected option");
+				return (rval);
+			}
+		}
+	}
+
+	return (0);
+}
+
+/*
+ * DTrace Consumer State Functions
+ */
+int
+dtrace_dstate_init(dtrace_dstate_t *dstate, size_t size)
+{
+	size_t hashsize, maxper, min, chunksize = dstate->dtds_chunksize;
+	void *base;
+	uintptr_t limit;
+	dtrace_dynvar_t *dvar, *next, *start;
+	int i;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+	ASSERT(dstate->dtds_base == NULL && dstate->dtds_percpu == NULL);
+
+	bzero(dstate, sizeof (dtrace_dstate_t));
+
+	if ((dstate->dtds_chunksize = chunksize) == 0)
+		dstate->dtds_chunksize = DTRACE_DYNVAR_CHUNKSIZE;
+
+	if (size < (min = dstate->dtds_chunksize + sizeof (dtrace_dynhash_t)))
+		size = min;
+
+	if ((base = kmem_zalloc(size, KM_NOSLEEP)) == NULL)
+		return (ENOMEM);
+
+	dstate->dtds_size = size;
+	dstate->dtds_base = base;
+	dstate->dtds_percpu = kmem_cache_alloc(dtrace_state_cache, KM_SLEEP);
+	bzero(dstate->dtds_percpu, NCPU * sizeof (dtrace_dstate_percpu_t));
+
+	hashsize = size / (dstate->dtds_chunksize + sizeof (dtrace_dynhash_t));
+
+	if (hashsize != 1 && (hashsize & 1))
+		hashsize--;
+
+	dstate->dtds_hashsize = hashsize;
+	dstate->dtds_hash = dstate->dtds_base;
+
+	/*
+	 * Set all of our hash buckets to point to the single sink, and (if
+	 * it hasn't already been set), set the sink's hash value to be the
+	 * sink sentinel value.  The sink is needed for dynamic variable
+	 * lookups to know that they have iterated over an entire, valid hash
+	 * chain.
+	 */
+	for (i = 0; i < hashsize; i++)
+		dstate->dtds_hash[i].dtdh_chain = &dtrace_dynhash_sink;
+
+	if (dtrace_dynhash_sink.dtdv_hashval != DTRACE_DYNHASH_SINK)
+		dtrace_dynhash_sink.dtdv_hashval = DTRACE_DYNHASH_SINK;
+
+	/*
+	 * Determine number of active CPUs.  Divide free list evenly among
+	 * active CPUs.
+	 */
+	start = (dtrace_dynvar_t *)
+	    ((uintptr_t)base + hashsize * sizeof (dtrace_dynhash_t));
+	limit = (uintptr_t)base + size;
+
+	maxper = (limit - (uintptr_t)start) / NCPU;
+	maxper = (maxper / dstate->dtds_chunksize) * dstate->dtds_chunksize;
+
+	for (i = 0; i < NCPU; i++) {
+		dstate->dtds_percpu[i].dtdsc_free = dvar = start;
+
+		/*
+		 * If we don't even have enough chunks to make it once through
+		 * NCPUs, we're just going to allocate everything to the first
+		 * CPU.  And if we're on the last CPU, we're going to allocate
+		 * whatever is left over.  In either case, we set the limit to
+		 * be the limit of the dynamic variable space.
+		 */
+		if (maxper == 0 || i == NCPU - 1) {
+			limit = (uintptr_t)base + size;
+			start = NULL;
+		} else {
+			limit = (uintptr_t)start + maxper;
+			start = (dtrace_dynvar_t *)limit;
+		}
+
+		ASSERT(limit <= (uintptr_t)base + size);
+
+		for (;;) {
+			next = (dtrace_dynvar_t *)((uintptr_t)dvar +
+			    dstate->dtds_chunksize);
+
+			if ((uintptr_t)next + dstate->dtds_chunksize >= limit)
+				break;
+
+			dvar->dtdv_next = next;
+			dvar = next;
+		}
+
+		if (maxper == 0)
+			break;
+	}
+
+	return (0);
+}
+
+void
+dtrace_dstate_fini(dtrace_dstate_t *dstate)
+{
+	ASSERT(MUTEX_HELD(&cpu_lock));
+
+	if (dstate->dtds_base == NULL)
+		return;
+
+	kmem_free(dstate->dtds_base, dstate->dtds_size);
+	kmem_cache_free(dtrace_state_cache, dstate->dtds_percpu);
+}
+
+static void
+dtrace_vstate_fini(dtrace_vstate_t *vstate)
+{
+	/*
+	 * Logical XOR, where are you?
+	 */
+	ASSERT((vstate->dtvs_nglobals == 0) ^ (vstate->dtvs_globals != NULL));
+
+	if (vstate->dtvs_nglobals > 0) {
+		kmem_free(vstate->dtvs_globals, vstate->dtvs_nglobals *
+		    sizeof (dtrace_statvar_t *));
+	}
+
+	if (vstate->dtvs_ntlocals > 0) {
+		kmem_free(vstate->dtvs_tlocals, vstate->dtvs_ntlocals *
+		    sizeof (dtrace_difv_t));
+	}
+
+	ASSERT((vstate->dtvs_nlocals == 0) ^ (vstate->dtvs_locals != NULL));
+
+	if (vstate->dtvs_nlocals > 0) {
+		kmem_free(vstate->dtvs_locals, vstate->dtvs_nlocals *
+		    sizeof (dtrace_statvar_t *));
+	}
+}
+
+static void
+dtrace_state_clean(dtrace_state_t *state)
+{
+	if (state->dts_activity == DTRACE_ACTIVITY_INACTIVE)
+		return;
+
+	dtrace_dynvar_clean(&state->dts_vstate.dtvs_dynvars);
+	dtrace_speculation_clean(state);
+}
+
+static void
+dtrace_state_deadman(dtrace_state_t *state)
+{
+	hrtime_t now;
+
+	dtrace_sync();
+
+	now = dtrace_gethrtime();
+
+	if (state != dtrace_anon.dta_state &&
+	    now - state->dts_laststatus >= dtrace_deadman_user)
+		return;
+
+	/*
+	 * We must be sure that dts_alive never appears to be less than the
+	 * value upon entry to dtrace_state_deadman(), and because we lack a
+	 * dtrace_cas64(), we cannot store to it atomically.  We thus instead
+	 * store INT64_MAX to it, followed by a memory barrier, followed by
+	 * the new value.  This assures that dts_alive never appears to be
+	 * less than its true value, regardless of the order in which the
+	 * stores to the underlying storage are issued.
+	 */
+	state->dts_alive = INT64_MAX;
+	dtrace_membar_producer();
+	state->dts_alive = now;
+}
+
+dtrace_state_t *
+dtrace_state_create(dev_t *devp, cred_t *cr)
+{
+	minor_t minor;
+	major_t major;
+	char c[30];
+	dtrace_state_t *state;
+	dtrace_optval_t *opt;
+	int bufsize = NCPU * sizeof (dtrace_buffer_t), i;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+	ASSERT(MUTEX_HELD(&cpu_lock));
+
+	minor = (minor_t)(uintptr_t)vmem_alloc(dtrace_minor, 1,
+	    VM_BESTFIT | VM_SLEEP);
+
+	if (ddi_soft_state_zalloc(dtrace_softstate, minor) != DDI_SUCCESS) {
+		vmem_free(dtrace_minor, (void *)(uintptr_t)minor, 1);
+		return (NULL);
+	}
+
+	state = ddi_get_soft_state(dtrace_softstate, minor);
+	state->dts_epid = DTRACE_EPIDNONE + 1;
+
+	(void) snprintf(c, sizeof (c), "dtrace_aggid_%d", minor);
+	state->dts_aggid_arena = vmem_create(c, (void *)1, UINT32_MAX, 1,
+	    NULL, NULL, NULL, 0, VM_SLEEP | VMC_IDENTIFIER);
+
+	if (devp != NULL) {
+		major = getemajor(*devp);
+	} else {
+		major = ddi_driver_major(dtrace_devi);
+	}
+
+	state->dts_dev = makedevice(major, minor);
+
+	if (devp != NULL)
+		*devp = state->dts_dev;
+
+	/*
+	 * We allocate NCPU buffers.  On the one hand, this can be quite
+	 * a bit of memory per instance (nearly 36K on a Starcat).  On the
+	 * other hand, it saves an additional memory reference in the probe
+	 * path.
+	 */
+	state->dts_buffer = kmem_zalloc(bufsize, KM_SLEEP);
+	state->dts_aggbuffer = kmem_zalloc(bufsize, KM_SLEEP);
+	state->dts_cleaner = CYCLIC_NONE;
+	state->dts_deadman = CYCLIC_NONE;
+	state->dts_vstate.dtvs_state = state;
+
+	for (i = 0; i < DTRACEOPT_MAX; i++)
+		state->dts_options[i] = DTRACEOPT_UNSET;
+
+	/*
+	 * Set the default options.
+	 */
+	opt = state->dts_options;
+	opt[DTRACEOPT_BUFPOLICY] = DTRACEOPT_BUFPOLICY_SWITCH;
+	opt[DTRACEOPT_BUFRESIZE] = DTRACEOPT_BUFRESIZE_AUTO;
+	opt[DTRACEOPT_NSPEC] = dtrace_nspec_default;
+	opt[DTRACEOPT_SPECSIZE] = dtrace_specsize_default;
+	opt[DTRACEOPT_CPU] = (dtrace_optval_t)DTRACE_CPUALL;
+	opt[DTRACEOPT_STRSIZE] = dtrace_strsize_default;
+	opt[DTRACEOPT_STACKFRAMES] = dtrace_stackframes_default;
+	opt[DTRACEOPT_USTACKFRAMES] = dtrace_ustackframes_default;
+	opt[DTRACEOPT_CLEANRATE] = dtrace_cleanrate_default;
+	opt[DTRACEOPT_AGGRATE] = dtrace_aggrate_default;
+	opt[DTRACEOPT_SWITCHRATE] = dtrace_switchrate_default;
+	opt[DTRACEOPT_STATUSRATE] = dtrace_statusrate_default;
+	opt[DTRACEOPT_JSTACKFRAMES] = dtrace_jstackframes_default;
+	opt[DTRACEOPT_JSTACKSTRSIZE] = dtrace_jstackstrsize_default;
+
+	state->dts_activity = DTRACE_ACTIVITY_INACTIVE;
+
+	/*
+	 * Depending on the user credentials, we set flag bits which alter probe
+	 * visibility or the amount of destructiveness allowed.  In the case of
+	 * actual anonymous tracing, or the possession of all privileges, all of
+	 * the normal checks are bypassed.
+	 */
+	if (cr == NULL || PRIV_POLICY_ONLY(cr, PRIV_ALL, B_FALSE)) {
+		state->dts_cred.dcr_visible = DTRACE_CRV_ALL;
+		state->dts_cred.dcr_action = DTRACE_CRA_ALL;
+	} else {
+		/*
+		 * Set up the credentials for this instantiation.  We take a
+		 * hold on the credential to prevent it from disappearing on
+		 * us; this in turn prevents the zone_t referenced by this
+		 * credential from disappearing.  This means that we can
+		 * examine the credential and the zone from probe context.
+		 */
+		crhold(cr);
+		state->dts_cred.dcr_cred = cr;
+
+		/*
+		 * CRA_PROC means "we have *some* privilege for dtrace" and
+		 * unlocks the use of variables like pid, zonename, etc.
+		 */
+		if (PRIV_POLICY_ONLY(cr, PRIV_DTRACE_USER, B_FALSE) ||
+		    PRIV_POLICY_ONLY(cr, PRIV_DTRACE_PROC, B_FALSE)) {
+			state->dts_cred.dcr_action |= DTRACE_CRA_PROC;
+		}
+
+		/*
+		 * dtrace_user allows use of syscall and profile providers.
+		 * If the user also has proc_owner and/or proc_zone, we
+		 * extend the scope to include additional visibility and
+		 * destructive power.
+		 */
+		if (PRIV_POLICY_ONLY(cr, PRIV_DTRACE_USER, B_FALSE)) {
+			if (PRIV_POLICY_ONLY(cr, PRIV_PROC_OWNER, B_FALSE)) {
+				state->dts_cred.dcr_visible |=
+				    DTRACE_CRV_ALLPROC;
+
+				state->dts_cred.dcr_action |=
+				    DTRACE_CRA_PROC_DESTRUCTIVE_ALLUSER;
+			}
+
+			if (PRIV_POLICY_ONLY(cr, PRIV_PROC_ZONE, B_FALSE)) {
+				state->dts_cred.dcr_visible |=
+				    DTRACE_CRV_ALLZONE;
+
+				state->dts_cred.dcr_action |=
+				    DTRACE_CRA_PROC_DESTRUCTIVE_ALLZONE;
+			}
+
+			/*
+			 * If we have all privs in whatever zone this is,
+			 * we can do destructive things to processes which
+			 * have altered credentials.
+			 */
+			if (priv_isequalset(priv_getset(cr, PRIV_EFFECTIVE),
+			    cr->cr_zone->zone_privset)) {
+				state->dts_cred.dcr_action |=
+				    DTRACE_CRA_PROC_DESTRUCTIVE_CREDCHG;
+			}
+		}
+
+		/*
+		 * Holding the dtrace_kernel privilege also implies that
+		 * the user has the dtrace_user privilege from a visibility
+		 * perspective.  But without further privileges, some
+		 * destructive actions are not available.
+		 */
+		if (PRIV_POLICY_ONLY(cr, PRIV_DTRACE_KERNEL, B_FALSE)) {
+			/*
+			 * Make all probes in all zones visible.  However,
+			 * this doesn't mean that all actions become available
+			 * to all zones.
+			 */
+			state->dts_cred.dcr_visible |= DTRACE_CRV_KERNEL |
+			    DTRACE_CRV_ALLPROC | DTRACE_CRV_ALLZONE;
+
+			state->dts_cred.dcr_action |= DTRACE_CRA_KERNEL |
+			    DTRACE_CRA_PROC;
+			/*
+			 * Holding proc_owner means that destructive actions
+			 * for *this* zone are allowed.
+			 */
+			if (PRIV_POLICY_ONLY(cr, PRIV_PROC_OWNER, B_FALSE))
+				state->dts_cred.dcr_action |=
+				    DTRACE_CRA_PROC_DESTRUCTIVE_ALLUSER;
+
+			/*
+			 * Holding proc_zone means that destructive actions
+			 * for this user/group ID in all zones is allowed.
+			 */
+			if (PRIV_POLICY_ONLY(cr, PRIV_PROC_ZONE, B_FALSE))
+				state->dts_cred.dcr_action |=
+				    DTRACE_CRA_PROC_DESTRUCTIVE_ALLZONE;
+
+			/*
+			 * If we have all privs in whatever zone this is,
+			 * we can do destructive things to processes which
+			 * have altered credentials.
+			 */
+			if (priv_isequalset(priv_getset(cr, PRIV_EFFECTIVE),
+			    cr->cr_zone->zone_privset)) {
+				state->dts_cred.dcr_action |=
+				    DTRACE_CRA_PROC_DESTRUCTIVE_CREDCHG;
+			}
+		}
+
+		/*
+		 * Holding the dtrace_proc privilege gives control over fasttrap
+		 * and pid providers.  We need to grant wider destructive
+		 * privileges in the event that the user has proc_owner and/or
+		 * proc_zone.
+		 */
+		if (PRIV_POLICY_ONLY(cr, PRIV_DTRACE_PROC, B_FALSE)) {
+			if (PRIV_POLICY_ONLY(cr, PRIV_PROC_OWNER, B_FALSE))
+				state->dts_cred.dcr_action |=
+				    DTRACE_CRA_PROC_DESTRUCTIVE_ALLUSER;
+
+			if (PRIV_POLICY_ONLY(cr, PRIV_PROC_ZONE, B_FALSE))
+				state->dts_cred.dcr_action |=
+				    DTRACE_CRA_PROC_DESTRUCTIVE_ALLZONE;
+		}
+	}
+
+	return (state);
+}
+
+static int
+dtrace_state_buffer(dtrace_state_t *state, dtrace_buffer_t *buf, int which)
+{
+	dtrace_optval_t *opt = state->dts_options, size;
+	processorid_t cpu;
+	int flags = 0, rval;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+	ASSERT(MUTEX_HELD(&cpu_lock));
+	ASSERT(which < DTRACEOPT_MAX);
+	ASSERT(state->dts_activity == DTRACE_ACTIVITY_INACTIVE ||
+	    (state == dtrace_anon.dta_state &&
+	    state->dts_activity == DTRACE_ACTIVITY_ACTIVE));
+
+	if (opt[which] == DTRACEOPT_UNSET || opt[which] == 0)
+		return (0);
+
+	if (opt[DTRACEOPT_CPU] != DTRACEOPT_UNSET)
+		cpu = opt[DTRACEOPT_CPU];
+
+	if (which == DTRACEOPT_SPECSIZE)
+		flags |= DTRACEBUF_NOSWITCH;
+
+	if (which == DTRACEOPT_BUFSIZE) {
+		if (opt[DTRACEOPT_BUFPOLICY] == DTRACEOPT_BUFPOLICY_RING)
+			flags |= DTRACEBUF_RING;
+
+		if (opt[DTRACEOPT_BUFPOLICY] == DTRACEOPT_BUFPOLICY_FILL)
+			flags |= DTRACEBUF_FILL;
+
+		if (state != dtrace_anon.dta_state ||
+		    state->dts_activity != DTRACE_ACTIVITY_ACTIVE)
+			flags |= DTRACEBUF_INACTIVE;
+	}
+
+	for (size = opt[which]; size >= sizeof (uint64_t); size >>= 1) {
+		/*
+		 * The size must be 8-byte aligned.  If the size is not 8-byte
+		 * aligned, drop it down by the difference.
+		 */
+		if (size & (sizeof (uint64_t) - 1))
+			size -= size & (sizeof (uint64_t) - 1);
+
+		if (size < state->dts_reserve) {
+			/*
+			 * Buffers always must be large enough to accommodate
+			 * their prereserved space.  We return E2BIG instead
+			 * of ENOMEM in this case to allow for user-level
+			 * software to differentiate the cases.
+			 */
+			return (E2BIG);
+		}
+
+		rval = dtrace_buffer_alloc(buf, size, flags, cpu);
+
+		if (rval != ENOMEM) {
+			opt[which] = size;
+			return (rval);
+		}
+
+		if (opt[DTRACEOPT_BUFRESIZE] == DTRACEOPT_BUFRESIZE_MANUAL)
+			return (rval);
+	}
+
+	return (ENOMEM);
+}
+
+static int
+dtrace_state_buffers(dtrace_state_t *state)
+{
+	dtrace_speculation_t *spec = state->dts_speculations;
+	int rval, i;
+
+	if ((rval = dtrace_state_buffer(state, state->dts_buffer,
+	    DTRACEOPT_BUFSIZE)) != 0)
+		return (rval);
+
+	if ((rval = dtrace_state_buffer(state, state->dts_aggbuffer,
+	    DTRACEOPT_AGGSIZE)) != 0)
+		return (rval);
+
+	for (i = 0; i < state->dts_nspeculations; i++) {
+		if ((rval = dtrace_state_buffer(state,
+		    spec[i].dtsp_buffer, DTRACEOPT_SPECSIZE)) != 0)
+			return (rval);
+	}
+
+	return (0);
+}
+
+static void
+dtrace_state_prereserve(dtrace_state_t *state)
+{
+	dtrace_ecb_t *ecb;
+	dtrace_probe_t *probe;
+
+	state->dts_reserve = 0;
+
+	if (state->dts_options[DTRACEOPT_BUFPOLICY] != DTRACEOPT_BUFPOLICY_FILL)
+		return;
+
+	/*
+	 * If our buffer policy is a "fill" buffer policy, we need to set the
+	 * prereserved space to be the space required by the END probes.
+	 */
+	probe = dtrace_probes[dtrace_probeid_end - 1];
+	ASSERT(probe != NULL);
+
+	for (ecb = probe->dtpr_ecb; ecb != NULL; ecb = ecb->dte_next) {
+		if (ecb->dte_state != state)
+			continue;
+
+		state->dts_reserve += ecb->dte_needed + ecb->dte_alignment;
+	}
+}
+
+static int
+dtrace_state_go(dtrace_state_t *state, processorid_t *cpu)
+{
+	dtrace_optval_t *opt = state->dts_options, sz, nspec;
+	dtrace_speculation_t *spec;
+	dtrace_buffer_t *buf;
+	cyc_handler_t hdlr;
+	cyc_time_t when;
+	int rval = 0, i, bufsize = NCPU * sizeof (dtrace_buffer_t);
+	dtrace_icookie_t cookie;
+
+	mutex_enter(&cpu_lock);
+	mutex_enter(&dtrace_lock);
+
+	if (state->dts_activity != DTRACE_ACTIVITY_INACTIVE) {
+		rval = EBUSY;
+		goto out;
+	}
+
+	/*
+	 * Before we can perform any checks, we must prime all of the
+	 * retained enablings that correspond to this state.
+	 */
+	dtrace_enabling_prime(state);
+
+	if (state->dts_destructive && !state->dts_cred.dcr_destructive) {
+		rval = EACCES;
+		goto out;
+	}
+
+	dtrace_state_prereserve(state);
+
+	/*
+	 * Now we want to do is try to allocate our speculations.
+	 * We do not automatically resize the number of speculations; if
+	 * this fails, we will fail the operation.
+	 */
+	nspec = opt[DTRACEOPT_NSPEC];
+	ASSERT(nspec != DTRACEOPT_UNSET);
+
+	if (nspec > INT_MAX) {
+		rval = ENOMEM;
+		goto out;
+	}
+
+	spec = kmem_zalloc(nspec * sizeof (dtrace_speculation_t), KM_NOSLEEP);
+
+	if (spec == NULL) {
+		rval = ENOMEM;
+		goto out;
+	}
+
+	state->dts_speculations = spec;
+	state->dts_nspeculations = (int)nspec;
+
+	for (i = 0; i < nspec; i++) {
+		if ((buf = kmem_zalloc(bufsize, KM_NOSLEEP)) == NULL) {
+			rval = ENOMEM;
+			goto err;
+		}
+
+		spec[i].dtsp_buffer = buf;
+	}
+
+	if (opt[DTRACEOPT_GRABANON] != DTRACEOPT_UNSET) {
+		if (dtrace_anon.dta_state == NULL) {
+			rval = ENOENT;
+			goto out;
+		}
+
+		if (state->dts_necbs != 0) {
+			rval = EALREADY;
+			goto out;
+		}
+
+		state->dts_anon = dtrace_anon_grab();
+		ASSERT(state->dts_anon != NULL);
+		state = state->dts_anon;
+
+		/*
+		 * We want "grabanon" to be set in the grabbed state, so we'll
+		 * copy that option value from the grabbing state into the
+		 * grabbed state.
+		 */
+		state->dts_options[DTRACEOPT_GRABANON] =
+		    opt[DTRACEOPT_GRABANON];
+
+		*cpu = dtrace_anon.dta_beganon;
+
+		/*
+		 * If the anonymous state is active (as it almost certainly
+		 * is if the anonymous enabling ultimately matched anything),
+		 * we don't allow any further option processing -- but we
+		 * don't return failure.
+		 */
+		if (state->dts_activity != DTRACE_ACTIVITY_INACTIVE)
+			goto out;
+	}
+
+	if (opt[DTRACEOPT_AGGSIZE] != DTRACEOPT_UNSET &&
+	    opt[DTRACEOPT_AGGSIZE] != 0) {
+		if (state->dts_aggregations == NULL) {
+			/*
+			 * We're not going to create an aggregation buffer
+			 * because we don't have any ECBs that contain
+			 * aggregations -- set this option to 0.
+			 */
+			opt[DTRACEOPT_AGGSIZE] = 0;
+		} else {
+			/*
+			 * If we have an aggregation buffer, we must also have
+			 * a buffer to use as scratch.
+			 */
+			if (opt[DTRACEOPT_BUFSIZE] == DTRACEOPT_UNSET ||
+			    opt[DTRACEOPT_BUFSIZE] < state->dts_needed) {
+				opt[DTRACEOPT_BUFSIZE] = state->dts_needed;
+			}
+		}
+	}
+
+	if (opt[DTRACEOPT_SPECSIZE] != DTRACEOPT_UNSET &&
+	    opt[DTRACEOPT_SPECSIZE] != 0) {
+		if (!state->dts_speculates) {
+			/*
+			 * We're not going to create speculation buffers
+			 * because we don't have any ECBs that actually
+			 * speculate -- set the speculation size to 0.
+			 */
+			opt[DTRACEOPT_SPECSIZE] = 0;
+		}
+	}
+
+	/*
+	 * The bare minimum size for any buffer that we're actually going to
+	 * do anything to is sizeof (uint64_t).
+	 */
+	sz = sizeof (uint64_t);
+
+	if ((state->dts_needed != 0 && opt[DTRACEOPT_BUFSIZE] < sz) ||
+	    (state->dts_speculates && opt[DTRACEOPT_SPECSIZE] < sz) ||
+	    (state->dts_aggregations != NULL && opt[DTRACEOPT_AGGSIZE] < sz)) {
+		/*
+		 * A buffer size has been explicitly set to 0 (or to a size
+		 * that will be adjusted to 0) and we need the space -- we
+		 * need to return failure.  We return ENOSPC to differentiate
+		 * it from failing to allocate a buffer due to failure to meet
+		 * the reserve (for which we return E2BIG).
+		 */
+		rval = ENOSPC;
+		goto out;
+	}
+
+	if ((rval = dtrace_state_buffers(state)) != 0)
+		goto err;
+
+	if ((sz = opt[DTRACEOPT_DYNVARSIZE]) == DTRACEOPT_UNSET)
+		sz = dtrace_dstate_defsize;
+
+	do {
+		rval = dtrace_dstate_init(&state->dts_vstate.dtvs_dynvars, sz);
+
+		if (rval == 0)
+			break;
+
+		if (opt[DTRACEOPT_BUFRESIZE] == DTRACEOPT_BUFRESIZE_MANUAL)
+			goto err;
+	} while (sz >>= 1);
+
+	opt[DTRACEOPT_DYNVARSIZE] = sz;
+
+	if (rval != 0)
+		goto err;
+
+	if (opt[DTRACEOPT_STATUSRATE] > dtrace_statusrate_max)
+		opt[DTRACEOPT_STATUSRATE] = dtrace_statusrate_max;
+
+	if (opt[DTRACEOPT_CLEANRATE] == 0)
+		opt[DTRACEOPT_CLEANRATE] = dtrace_cleanrate_max;
+
+	if (opt[DTRACEOPT_CLEANRATE] < dtrace_cleanrate_min)
+		opt[DTRACEOPT_CLEANRATE] = dtrace_cleanrate_min;
+
+	if (opt[DTRACEOPT_CLEANRATE] > dtrace_cleanrate_max)
+		opt[DTRACEOPT_CLEANRATE] = dtrace_cleanrate_max;
+
+	hdlr.cyh_func = (cyc_func_t)dtrace_state_clean;
+	hdlr.cyh_arg = state;
+	hdlr.cyh_level = CY_LOW_LEVEL;
+
+	when.cyt_when = 0;
+	when.cyt_interval = opt[DTRACEOPT_CLEANRATE];
+
+	state->dts_cleaner = cyclic_add(&hdlr, &when);
+
+	hdlr.cyh_func = (cyc_func_t)dtrace_state_deadman;
+	hdlr.cyh_arg = state;
+	hdlr.cyh_level = CY_LOW_LEVEL;
+
+	when.cyt_when = 0;
+	when.cyt_interval = dtrace_deadman_interval;
+
+	state->dts_alive = state->dts_laststatus = dtrace_gethrtime();
+	state->dts_deadman = cyclic_add(&hdlr, &when);
+
+	state->dts_activity = DTRACE_ACTIVITY_WARMUP;
+
+	/*
+	 * Now it's time to actually fire the BEGIN probe.  We need to disable
+	 * interrupts here both to record the CPU on which we fired the BEGIN
+	 * probe (the data from this CPU will be processed first at user
+	 * level) and to manually activate the buffer for this CPU.
+	 */
+	cookie = dtrace_interrupt_disable();
+	*cpu = CPU->cpu_id;
+	ASSERT(state->dts_buffer[*cpu].dtb_flags & DTRACEBUF_INACTIVE);
+	state->dts_buffer[*cpu].dtb_flags &= ~DTRACEBUF_INACTIVE;
+
+	dtrace_probe(dtrace_probeid_begin,
+	    (uint64_t)(uintptr_t)state, 0, 0, 0, 0);
+	dtrace_interrupt_enable(cookie);
+	/*
+	 * We may have had an exit action from a BEGIN probe; only change our
+	 * state to ACTIVE if we're still in WARMUP.
+	 */
+	ASSERT(state->dts_activity == DTRACE_ACTIVITY_WARMUP ||
+	    state->dts_activity == DTRACE_ACTIVITY_DRAINING);
+
+	if (state->dts_activity == DTRACE_ACTIVITY_WARMUP)
+		state->dts_activity = DTRACE_ACTIVITY_ACTIVE;
+
+	/*
+	 * Regardless of whether or not now we're in ACTIVE or DRAINING, we
+	 * want each CPU to transition its principal buffer out of the
+	 * INACTIVE state.  Doing this assures that no CPU will suddenly begin
+	 * processing an ECB halfway down a probe's ECB chain; all CPUs will
+	 * atomically transition from processing none of a state's ECBs to
+	 * processing all of them.
+	 */
+	dtrace_xcall(DTRACE_CPUALL,
+	    (dtrace_xcall_t)dtrace_buffer_activate, state);
+	goto out;
+
+err:
+	dtrace_buffer_free(state->dts_buffer);
+	dtrace_buffer_free(state->dts_aggbuffer);
+
+	if ((nspec = state->dts_nspeculations) == 0) {
+		ASSERT(state->dts_speculations == NULL);
+		goto out;
+	}
+
+	spec = state->dts_speculations;
+	ASSERT(spec != NULL);
+
+	for (i = 0; i < state->dts_nspeculations; i++) {
+		if ((buf = spec[i].dtsp_buffer) == NULL)
+			break;
+
+		dtrace_buffer_free(buf);
+		kmem_free(buf, bufsize);
+	}
+
+	kmem_free(spec, nspec * sizeof (dtrace_speculation_t));
+	state->dts_nspeculations = 0;
+	state->dts_speculations = NULL;
+
+out:
+	mutex_exit(&dtrace_lock);
+	mutex_exit(&cpu_lock);
+
+	return (rval);
+}
+
+static int
+dtrace_state_stop(dtrace_state_t *state, processorid_t *cpu)
+{
+	dtrace_icookie_t cookie;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+
+	if (state->dts_activity != DTRACE_ACTIVITY_ACTIVE &&
+	    state->dts_activity != DTRACE_ACTIVITY_DRAINING)
+		return (EINVAL);
+
+	/*
+	 * We'll set the activity to DTRACE_ACTIVITY_DRAINING, and issue a sync
+	 * to be sure that every CPU has seen it.  See below for the details
+	 * on why this is done.
+	 */
+	state->dts_activity = DTRACE_ACTIVITY_DRAINING;
+	dtrace_sync();
+
+	/*
+	 * By this point, it is impossible for any CPU to be still processing
+	 * with DTRACE_ACTIVITY_ACTIVE.  We can thus set our activity to
+	 * DTRACE_ACTIVITY_COOLDOWN and know that we're not racing with any
+	 * other CPU in dtrace_buffer_reserve().  This allows dtrace_probe()
+	 * and callees to know that the activity is DTRACE_ACTIVITY_COOLDOWN
+	 * iff we're in the END probe.
+	 */
+	state->dts_activity = DTRACE_ACTIVITY_COOLDOWN;
+	dtrace_sync();
+	ASSERT(state->dts_activity == DTRACE_ACTIVITY_COOLDOWN);
+
+	/*
+	 * Finally, we can release the reserve and call the END probe.  We
+	 * disable interrupts across calling the END probe to allow us to
+	 * return the CPU on which we actually called the END probe.  This
+	 * allows user-land to be sure that this CPU's principal buffer is
+	 * processed last.
+	 */
+	state->dts_reserve = 0;
+
+	cookie = dtrace_interrupt_disable();
+	*cpu = CPU->cpu_id;
+	dtrace_probe(dtrace_probeid_end,
+	    (uint64_t)(uintptr_t)state, 0, 0, 0, 0);
+	dtrace_interrupt_enable(cookie);
+
+	state->dts_activity = DTRACE_ACTIVITY_STOPPED;
+	dtrace_sync();
+
+	return (0);
+}
+
+static int
+dtrace_state_option(dtrace_state_t *state, dtrace_optid_t option,
+    dtrace_optval_t val)
+{
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+
+	if (state->dts_activity != DTRACE_ACTIVITY_INACTIVE)
+		return (EBUSY);
+
+	if (option >= DTRACEOPT_MAX)
+		return (EINVAL);
+
+	if (option != DTRACEOPT_CPU && val < 0)
+		return (EINVAL);
+
+	switch (option) {
+	case DTRACEOPT_DESTRUCTIVE:
+		if (dtrace_destructive_disallow)
+			return (EACCES);
+
+		state->dts_cred.dcr_destructive = 1;
+		break;
+
+	case DTRACEOPT_BUFSIZE:
+	case DTRACEOPT_DYNVARSIZE:
+	case DTRACEOPT_AGGSIZE:
+	case DTRACEOPT_SPECSIZE:
+	case DTRACEOPT_STRSIZE:
+		if (val < 0)
+			return (EINVAL);
+
+		if (val >= LONG_MAX) {
+			/*
+			 * If this is an otherwise negative value, set it to
+			 * the highest multiple of 128m less than LONG_MAX.
+			 * Technically, we're adjusting the size without
+			 * regard to the buffer resizing policy, but in fact,
+			 * this has no effect -- if we set the buffer size to
+			 * ~LONG_MAX and the buffer policy is ultimately set to
+			 * be "manual", the buffer allocation is guaranteed to
+			 * fail, if only because the allocation requires two
+			 * buffers.  (We set the the size to the highest
+			 * multiple of 128m because it ensures that the size
+			 * will remain a multiple of a megabyte when
+			 * repeatedly halved -- all the way down to 15m.)
+			 */
+			val = LONG_MAX - (1 << 27) + 1;
+		}
+	}
+
+	state->dts_options[option] = val;
+
+	return (0);
+}
+
+static void
+dtrace_state_destroy(dtrace_state_t *state)
+{
+	dtrace_ecb_t *ecb;
+	dtrace_vstate_t *vstate = &state->dts_vstate;
+	minor_t minor = getminor(state->dts_dev);
+	int i, bufsize = NCPU * sizeof (dtrace_buffer_t);
+	dtrace_speculation_t *spec = state->dts_speculations;
+	int nspec = state->dts_nspeculations;
+	uint32_t match;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+	ASSERT(MUTEX_HELD(&cpu_lock));
+
+	/*
+	 * First, retract any retained enablings for this state.
+	 */
+	dtrace_enabling_retract(state);
+	ASSERT(state->dts_nretained == 0);
+
+	if (state->dts_activity == DTRACE_ACTIVITY_ACTIVE ||
+	    state->dts_activity == DTRACE_ACTIVITY_DRAINING) {
+		/*
+		 * We have managed to come into dtrace_state_destroy() on a
+		 * hot enabling -- almost certainly because of a disorderly
+		 * shutdown of a consumer.  (That is, a consumer that is
+		 * exiting without having called dtrace_stop().) In this case,
+		 * we're going to set our activity to be KILLED, and then
+		 * issue a sync to be sure that everyone is out of probe
+		 * context before we start blowing away ECBs.
+		 */
+		state->dts_activity = DTRACE_ACTIVITY_KILLED;
+		dtrace_sync();
+	}
+
+	/*
+	 * Release the credential hold we took in dtrace_state_create().
+	 */
+	if (state->dts_cred.dcr_cred != NULL)
+		crfree(state->dts_cred.dcr_cred);
+
+	/*
+	 * Now we can safely disable and destroy any enabled probes.  Because
+	 * any DTRACE_PRIV_KERNEL probes may actually be slowing our progress
+	 * (especially if they're all enabled), we take two passes through the
+	 * ECBs:  in the first, we disable just DTRACE_PRIV_KERNEL probes, and
+	 * in the second we disable whatever is left over.
+	 */
+	for (match = DTRACE_PRIV_KERNEL; ; match = 0) {
+		for (i = 0; i < state->dts_necbs; i++) {
+			if ((ecb = state->dts_ecbs[i]) == NULL)
+				continue;
+
+			if (match && ecb->dte_probe != NULL) {
+				dtrace_probe_t *probe = ecb->dte_probe;
+				dtrace_provider_t *prov = probe->dtpr_provider;
+
+				if (!(prov->dtpv_priv.dtpp_flags & match))
+					continue;
+			}
+
+			dtrace_ecb_disable(ecb);
+			dtrace_ecb_destroy(ecb);
+		}
+
+		if (!match)
+			break;
+	}
+
+	/*
+	 * Before we free the buffers, perform one more sync to assure that
+	 * every CPU is out of probe context.
+	 */
+	dtrace_sync();
+
+	dtrace_buffer_free(state->dts_buffer);
+	dtrace_buffer_free(state->dts_aggbuffer);
+
+	for (i = 0; i < nspec; i++)
+		dtrace_buffer_free(spec[i].dtsp_buffer);
+
+	if (state->dts_cleaner != CYCLIC_NONE)
+		cyclic_remove(state->dts_cleaner);
+
+	if (state->dts_deadman != CYCLIC_NONE)
+		cyclic_remove(state->dts_deadman);
+
+	dtrace_dstate_fini(&vstate->dtvs_dynvars);
+	dtrace_vstate_fini(vstate);
+	kmem_free(state->dts_ecbs, state->dts_necbs * sizeof (dtrace_ecb_t *));
+
+	if (state->dts_aggregations != NULL) {
+#ifdef DEBUG
+		for (i = 0; i < state->dts_naggregations; i++)
+			ASSERT(state->dts_aggregations[i] == NULL);
+#endif
+		ASSERT(state->dts_naggregations > 0);
+		kmem_free(state->dts_aggregations,
+		    state->dts_naggregations * sizeof (dtrace_aggregation_t *));
+	}
+
+	kmem_free(state->dts_buffer, bufsize);
+	kmem_free(state->dts_aggbuffer, bufsize);
+
+	for (i = 0; i < nspec; i++)
+		kmem_free(spec[i].dtsp_buffer, bufsize);
+
+	kmem_free(spec, nspec * sizeof (dtrace_speculation_t));
+
+	dtrace_format_destroy(state);
+
+	vmem_destroy(state->dts_aggid_arena);
+	ddi_soft_state_free(dtrace_softstate, minor);
+	vmem_free(dtrace_minor, (void *)(uintptr_t)minor, 1);
+}
+
+/*
+ * DTrace Anonymous Enabling Functions
+ */
+static dtrace_state_t *
+dtrace_anon_grab(void)
+{
+	dtrace_state_t *state;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+
+	if ((state = dtrace_anon.dta_state) == NULL) {
+		ASSERT(dtrace_anon.dta_enabling == NULL);
+		return (NULL);
+	}
+
+	ASSERT(dtrace_anon.dta_enabling != NULL);
+	ASSERT(dtrace_retained != NULL);
+
+	dtrace_enabling_destroy(dtrace_anon.dta_enabling);
+	dtrace_anon.dta_enabling = NULL;
+	dtrace_anon.dta_state = NULL;
+
+	return (state);
+}
+
+static void
+dtrace_anon_property(void)
+{
+	int i, rv;
+	dtrace_state_t *state;
+	dof_hdr_t *dof;
+	char c[32];		/* enough for "dof-data-" + digits */
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+	ASSERT(MUTEX_HELD(&cpu_lock));
+
+	for (i = 0; ; i++) {
+		(void) snprintf(c, sizeof (c), "dof-data-%d", i);
+
+		dtrace_err_verbose = 1;
+
+		if ((dof = dtrace_dof_property(c)) == NULL) {
+			dtrace_err_verbose = 0;
+			break;
+		}
+
+		/*
+		 * We want to create anonymous state, so we need to transition
+		 * the kernel debugger to indicate that DTrace is active.  If
+		 * this fails (e.g. because the debugger has modified text in
+		 * some way), we won't continue with the processing.
+		 */
+		if (kdi_dtrace_set(KDI_DTSET_DTRACE_ACTIVATE) != 0) {
+			cmn_err(CE_NOTE, "kernel debugger active; anonymous "
+			    "enabling ignored.");
+			dtrace_dof_destroy(dof);
+			break;
+		}
+
+		/*
+		 * If we haven't allocated an anonymous state, we'll do so now.
+		 */
+		if ((state = dtrace_anon.dta_state) == NULL) {
+			state = dtrace_state_create(NULL, NULL);
+			dtrace_anon.dta_state = state;
+
+			if (state == NULL) {
+				/*
+				 * This basically shouldn't happen:  the only
+				 * failure mode from dtrace_state_create() is a
+				 * failure of ddi_soft_state_zalloc() that
+				 * itself should never happen.  Still, the
+				 * interface allows for a failure mode, and
+				 * we want to fail as gracefully as possible:
+				 * we'll emit an error message and cease
+				 * processing anonymous state in this case.
+				 */
+				cmn_err(CE_WARN, "failed to create "
+				    "anonymous state");
+				dtrace_dof_destroy(dof);
+				break;
+			}
+		}
+
+		rv = dtrace_dof_slurp(dof, &state->dts_vstate, CRED(),
+		    &dtrace_anon.dta_enabling, 0, B_TRUE);
+
+		if (rv == 0)
+			rv = dtrace_dof_options(dof, state);
+
+		dtrace_err_verbose = 0;
+		dtrace_dof_destroy(dof);
+
+		if (rv != 0) {
+			/*
+			 * This is malformed DOF; chuck any anonymous state
+			 * that we created.
+			 */
+			ASSERT(dtrace_anon.dta_enabling == NULL);
+			dtrace_state_destroy(state);
+			dtrace_anon.dta_state = NULL;
+			break;
+		}
+
+		ASSERT(dtrace_anon.dta_enabling != NULL);
+	}
+
+	if (dtrace_anon.dta_enabling != NULL) {
+		int rval;
+
+		/*
+		 * dtrace_enabling_retain() can only fail because we are
+		 * trying to retain more enablings than are allowed -- but
+		 * we only have one anonymous enabling, and we are guaranteed
+		 * to be allowed at least one retained enabling; we assert
+		 * that dtrace_enabling_retain() returns success.
+		 */
+		rval = dtrace_enabling_retain(dtrace_anon.dta_enabling);
+		ASSERT(rval == 0);
+
+		dtrace_enabling_dump(dtrace_anon.dta_enabling);
+	}
+}
+
+/*
+ * DTrace Helper Functions
+ */
+static void
+dtrace_helper_trace(dtrace_helper_action_t *helper,
+    dtrace_mstate_t *mstate, dtrace_vstate_t *vstate, int where)
+{
+	uint32_t size, next, nnext, i;
+	dtrace_helptrace_t *ent;
+	uint16_t flags = cpu_core[CPU->cpu_id].cpuc_dtrace_flags;
+
+	if (!dtrace_helptrace_enabled)
+		return;
+
+	ASSERT(vstate->dtvs_nlocals <= dtrace_helptrace_nlocals);
+
+	/*
+	 * What would a tracing framework be without its own tracing
+	 * framework?  (Well, a hell of a lot simpler, for starters...)
+	 */
+	size = sizeof (dtrace_helptrace_t) + dtrace_helptrace_nlocals *
+	    sizeof (uint64_t) - sizeof (uint64_t);
+
+	/*
+	 * Iterate until we can allocate a slot in the trace buffer.
+	 */
+	do {
+		next = dtrace_helptrace_next;
+
+		if (next + size < dtrace_helptrace_bufsize) {
+			nnext = next + size;
+		} else {
+			nnext = size;
+		}
+	} while (dtrace_cas32(&dtrace_helptrace_next, next, nnext) != next);
+
+	/*
+	 * We have our slot; fill it in.
+	 */
+	if (nnext == size)
+		next = 0;
+
+	ent = (dtrace_helptrace_t *)&dtrace_helptrace_buffer[next];
+	ent->dtht_helper = helper;
+	ent->dtht_where = where;
+	ent->dtht_nlocals = vstate->dtvs_nlocals;
+
+	ent->dtht_fltoffs = (mstate->dtms_present & DTRACE_MSTATE_FLTOFFS) ?
+	    mstate->dtms_fltoffs : -1;
+	ent->dtht_fault = DTRACE_FLAGS2FLT(flags);
+	ent->dtht_illval = cpu_core[CPU->cpu_id].cpuc_dtrace_illval;
+
+	for (i = 0; i < vstate->dtvs_nlocals; i++) {
+		dtrace_statvar_t *svar;
+
+		if ((svar = vstate->dtvs_locals[i]) == NULL)
+			continue;
+
+		ASSERT(svar->dtsv_size >= NCPU * sizeof (uint64_t));
+		ent->dtht_locals[i] =
+		    ((uint64_t *)(uintptr_t)svar->dtsv_data)[CPU->cpu_id];
+	}
+}
+
+static uint64_t
+dtrace_helper(int which, dtrace_mstate_t *mstate,
+    dtrace_state_t *state, uint64_t arg0, uint64_t arg1)
+{
+	uint16_t *flags = &cpu_core[CPU->cpu_id].cpuc_dtrace_flags;
+	uint64_t sarg0 = mstate->dtms_arg[0];
+	uint64_t sarg1 = mstate->dtms_arg[1];
+	uint64_t rval;
+	dtrace_helpers_t *helpers = curproc->p_dtrace_helpers;
+	dtrace_helper_action_t *helper;
+	dtrace_vstate_t *vstate;
+	dtrace_difo_t *pred;
+	int i, trace = dtrace_helptrace_enabled;
+
+	ASSERT(which >= 0 && which < DTRACE_NHELPER_ACTIONS);
+
+	if (helpers == NULL)
+		return (0);
+
+	if ((helper = helpers->dthps_actions[which]) == NULL)
+		return (0);
+
+	vstate = &helpers->dthps_vstate;
+	mstate->dtms_arg[0] = arg0;
+	mstate->dtms_arg[1] = arg1;
+
+	/*
+	 * Now iterate over each helper.  If its predicate evaluates to 'true',
+	 * we'll call the corresponding actions.  Note that the below calls
+	 * to dtrace_dif_emulate() may set faults in machine state.  This is
+	 * okay:  our caller (the outer dtrace_dif_emulate()) will simply plow
+	 * the stored DIF offset with its own (which is the desired behavior).
+	 * Also, note the calls to dtrace_dif_emulate() may allocate scratch
+	 * from machine state; this is okay, too.
+	 */
+	for (; helper != NULL; helper = helper->dtha_next) {
+		if ((pred = helper->dtha_predicate) != NULL) {
+			if (trace)
+				dtrace_helper_trace(helper, mstate, vstate, 0);
+
+			if (!dtrace_dif_emulate(pred, mstate, vstate, state))
+				goto next;
+
+			if (*flags & CPU_DTRACE_FAULT)
+				goto err;
+		}
+
+		for (i = 0; i < helper->dtha_nactions; i++) {
+			if (trace)
+				dtrace_helper_trace(helper,
+				    mstate, vstate, i + 1);
+
+			rval = dtrace_dif_emulate(helper->dtha_actions[i],
+			    mstate, vstate, state);
+
+			if (*flags & CPU_DTRACE_FAULT)
+				goto err;
+		}
+
+next:
+		if (trace)
+			dtrace_helper_trace(helper, mstate, vstate,
+			    DTRACE_HELPTRACE_NEXT);
+	}
+
+	if (trace)
+		dtrace_helper_trace(helper, mstate, vstate,
+		    DTRACE_HELPTRACE_DONE);
+
+	/*
+	 * Restore the arg0 that we saved upon entry.
+	 */
+	mstate->dtms_arg[0] = sarg0;
+	mstate->dtms_arg[1] = sarg1;
+
+	return (rval);
+
+err:
+	if (trace)
+		dtrace_helper_trace(helper, mstate, vstate,
+		    DTRACE_HELPTRACE_ERR);
+
+	/*
+	 * Restore the arg0 that we saved upon entry.
+	 */
+	mstate->dtms_arg[0] = sarg0;
+	mstate->dtms_arg[1] = sarg1;
+
+	return (NULL);
+}
+
+static void
+dtrace_helper_action_destroy(dtrace_helper_action_t *helper,
+    dtrace_vstate_t *vstate)
+{
+	int i;
+
+	if (helper->dtha_predicate != NULL)
+		dtrace_difo_release(helper->dtha_predicate, vstate);
+
+	for (i = 0; i < helper->dtha_nactions; i++) {
+		ASSERT(helper->dtha_actions[i] != NULL);
+		dtrace_difo_release(helper->dtha_actions[i], vstate);
+	}
+
+	kmem_free(helper->dtha_actions,
+	    helper->dtha_nactions * sizeof (dtrace_difo_t *));
+	kmem_free(helper, sizeof (dtrace_helper_action_t));
+}
+
+static int
+dtrace_helper_destroygen(int gen)
+{
+	proc_t *p = curproc;
+	dtrace_helpers_t *help = p->p_dtrace_helpers;
+	dtrace_vstate_t *vstate;
+	int i;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+
+	if (help == NULL || gen > help->dthps_generation)
+		return (EINVAL);
+
+	vstate = &help->dthps_vstate;
+
+	for (i = 0; i < DTRACE_NHELPER_ACTIONS; i++) {
+		dtrace_helper_action_t *last = NULL, *h, *next;
+
+		for (h = help->dthps_actions[i]; h != NULL; h = next) {
+			next = h->dtha_next;
+
+			if (h->dtha_generation == gen) {
+				if (last != NULL) {
+					last->dtha_next = next;
+				} else {
+					help->dthps_actions[i] = next;
+				}
+
+				dtrace_helper_action_destroy(h, vstate);
+			} else {
+				last = h;
+			}
+		}
+	}
+
+	/*
+	 * Interate until we've cleared out all helper providers with the
+	 * given generation number.
+	 */
+	for (;;) {
+		dtrace_helper_provider_t *prov;
+
+		/*
+		 * Look for a helper provider with the right generation. We
+		 * have to start back at the beginning of the list each time
+		 * because we drop dtrace_lock. It's unlikely that we'll make
+		 * more than two passes.
+		 */
+		for (i = 0; i < help->dthps_nprovs; i++) {
+			prov = help->dthps_provs[i];
+
+			if (prov->dthp_generation == gen)
+				break;
+		}
+
+		/*
+		 * If there were no matches, we're done.
+		 */
+		if (i == help->dthps_nprovs)
+			break;
+
+		/*
+		 * Move the last helper provider into this slot.
+		 */
+		help->dthps_nprovs--;
+		help->dthps_provs[i] = help->dthps_provs[help->dthps_nprovs];
+		help->dthps_provs[help->dthps_nprovs] = NULL;
+
+		mutex_exit(&dtrace_lock);
+
+		/*
+		 * If we have a meta provider, remove this helper provider.
+		 */
+		mutex_enter(&dtrace_meta_lock);
+		if (dtrace_meta_pid != NULL) {
+			ASSERT(dtrace_deferred_pid == NULL);
+			dtrace_helper_provider_remove(&prov->dthp_prov,
+			    p->p_pid);
+		}
+		mutex_exit(&dtrace_meta_lock);
+
+		dtrace_helper_provider_destroy(prov);
+
+		mutex_enter(&dtrace_lock);
+	}
+
+	return (0);
+}
+
+static int
+dtrace_helper_validate(dtrace_helper_action_t *helper)
+{
+	int err = 0, i;
+	dtrace_difo_t *dp;
+
+	if ((dp = helper->dtha_predicate) != NULL)
+		err += dtrace_difo_validate_helper(dp);
+
+	for (i = 0; i < helper->dtha_nactions; i++)
+		err += dtrace_difo_validate_helper(helper->dtha_actions[i]);
+
+	return (err == 0);
+}
+
+static int
+dtrace_helper_action_add(int which, dtrace_ecbdesc_t *ep)
+{
+	dtrace_helpers_t *help;
+	dtrace_helper_action_t *helper, *last;
+	dtrace_actdesc_t *act;
+	dtrace_vstate_t *vstate;
+	dtrace_predicate_t *pred;
+	int count = 0, nactions = 0, i;
+
+	if (which < 0 || which >= DTRACE_NHELPER_ACTIONS)
+		return (EINVAL);
+
+	help = curproc->p_dtrace_helpers;
+	last = help->dthps_actions[which];
+	vstate = &help->dthps_vstate;
+
+	for (count = 0; last != NULL; last = last->dtha_next) {
+		count++;
+		if (last->dtha_next == NULL)
+			break;
+	}
+
+	/*
+	 * If we already have dtrace_helper_actions_max helper actions for this
+	 * helper action type, we'll refuse to add a new one.
+	 */
+	if (count >= dtrace_helper_actions_max)
+		return (ENOSPC);
+
+	helper = kmem_zalloc(sizeof (dtrace_helper_action_t), KM_SLEEP);
+	helper->dtha_generation = help->dthps_generation;
+
+	if ((pred = ep->dted_pred.dtpdd_predicate) != NULL) {
+		ASSERT(pred->dtp_difo != NULL);
+		dtrace_difo_hold(pred->dtp_difo);
+		helper->dtha_predicate = pred->dtp_difo;
+	}
+
+	for (act = ep->dted_action; act != NULL; act = act->dtad_next) {
+		if (act->dtad_kind != DTRACEACT_DIFEXPR)
+			goto err;
+
+		if (act->dtad_difo == NULL)
+			goto err;
+
+		nactions++;
+	}
+
+	helper->dtha_actions = kmem_zalloc(sizeof (dtrace_difo_t *) *
+	    (helper->dtha_nactions = nactions), KM_SLEEP);
+
+	for (act = ep->dted_action, i = 0; act != NULL; act = act->dtad_next) {
+		dtrace_difo_hold(act->dtad_difo);
+		helper->dtha_actions[i++] = act->dtad_difo;
+	}
+
+	if (!dtrace_helper_validate(helper))
+		goto err;
+
+	if (last == NULL) {
+		help->dthps_actions[which] = helper;
+	} else {
+		last->dtha_next = helper;
+	}
+
+	if (vstate->dtvs_nlocals > dtrace_helptrace_nlocals) {
+		dtrace_helptrace_nlocals = vstate->dtvs_nlocals;
+		dtrace_helptrace_next = 0;
+	}
+
+	return (0);
+err:
+	dtrace_helper_action_destroy(helper, vstate);
+	return (EINVAL);
+}
+
+static void
+dtrace_helper_provider_register(proc_t *p, dtrace_helpers_t *help,
+    dof_helper_t *dofhp)
+{
+	ASSERT(MUTEX_NOT_HELD(&dtrace_lock));
+
+	mutex_enter(&dtrace_meta_lock);
+	mutex_enter(&dtrace_lock);
+
+	if (!dtrace_attached() || dtrace_meta_pid == NULL) {
+		/*
+		 * If the dtrace module is loaded but not attached, or if
+		 * there aren't isn't a meta provider registered to deal with
+		 * these provider descriptions, we need to postpone creating
+		 * the actual providers until later.
+		 */
+
+		if (help->dthps_next == NULL && help->dthps_prev == NULL &&
+		    dtrace_deferred_pid != help) {
+			help->dthps_deferred = 1;
+			help->dthps_pid = p->p_pid;
+			help->dthps_next = dtrace_deferred_pid;
+			help->dthps_prev = NULL;
+			if (dtrace_deferred_pid != NULL)
+				dtrace_deferred_pid->dthps_prev = help;
+			dtrace_deferred_pid = help;
+		}
+
+		mutex_exit(&dtrace_lock);
+
+	} else if (dofhp != NULL) {
+		/*
+		 * If the dtrace module is loaded and we have a particular
+		 * helper provider description, pass that off to the
+		 * meta provider.
+		 */
+
+		mutex_exit(&dtrace_lock);
+
+		dtrace_helper_provide(dofhp, p->p_pid);
+
+	} else {
+		/*
+		 * Otherwise, just pass all the helper provider descriptions
+		 * off to the meta provider.
+		 */
+
+		int i;
+		mutex_exit(&dtrace_lock);
+
+		for (i = 0; i < help->dthps_nprovs; i++) {
+			dtrace_helper_provide(&help->dthps_provs[i]->dthp_prov,
+			    p->p_pid);
+		}
+	}
+
+	mutex_exit(&dtrace_meta_lock);
+}
+
+static int
+dtrace_helper_provider_add(dof_helper_t *dofhp, int gen)
+{
+	dtrace_helpers_t *help;
+	dtrace_helper_provider_t *hprov, **tmp_provs;
+	uint_t tmp_maxprovs, i;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+
+	help = curproc->p_dtrace_helpers;
+	ASSERT(help != NULL);
+
+	/*
+	 * If we already have dtrace_helper_providers_max helper providers,
+	 * we're refuse to add a new one.
+	 */
+	if (help->dthps_nprovs >= dtrace_helper_providers_max)
+		return (ENOSPC);
+
+	/*
+	 * Check to make sure this isn't a duplicate.
+	 */
+	for (i = 0; i < help->dthps_nprovs; i++) {
+		if (dofhp->dofhp_addr ==
+		    help->dthps_provs[i]->dthp_prov.dofhp_addr)
+			return (EALREADY);
+	}
+
+	hprov = kmem_zalloc(sizeof (dtrace_helper_provider_t), KM_SLEEP);
+	hprov->dthp_prov = *dofhp;
+	hprov->dthp_ref = 1;
+	hprov->dthp_generation = gen;
+
+	/*
+	 * Allocate a bigger table for helper providers if it's already full.
+	 */
+	if (help->dthps_maxprovs == help->dthps_nprovs) {
+		tmp_maxprovs = help->dthps_maxprovs;
+		tmp_provs = help->dthps_provs;
+
+		if (help->dthps_maxprovs == 0)
+			help->dthps_maxprovs = 2;
+		else
+			help->dthps_maxprovs *= 2;
+		if (help->dthps_maxprovs > dtrace_helper_providers_max)
+			help->dthps_maxprovs = dtrace_helper_providers_max;
+
+		ASSERT(tmp_maxprovs < help->dthps_maxprovs);
+
+		help->dthps_provs = kmem_zalloc(help->dthps_maxprovs *
+		    sizeof (dtrace_helper_provider_t *), KM_SLEEP);
+
+		if (tmp_provs != NULL) {
+			bcopy(tmp_provs, help->dthps_provs, tmp_maxprovs *
+			    sizeof (dtrace_helper_provider_t *));
+			kmem_free(tmp_provs, tmp_maxprovs *
+			    sizeof (dtrace_helper_provider_t *));
+		}
+	}
+
+	help->dthps_provs[help->dthps_nprovs] = hprov;
+	help->dthps_nprovs++;
+
+	return (0);
+}
+
+static void
+dtrace_helper_provider_destroy(dtrace_helper_provider_t *hprov)
+{
+	mutex_enter(&dtrace_lock);
+
+	if (--hprov->dthp_ref == 0) {
+		dof_hdr_t *dof;
+		mutex_exit(&dtrace_lock);
+		dof = (dof_hdr_t *)(uintptr_t)hprov->dthp_prov.dofhp_dof;
+		dtrace_dof_destroy(dof);
+		kmem_free(hprov, sizeof (dtrace_helper_provider_t));
+	} else {
+		mutex_exit(&dtrace_lock);
+	}
+}
+
+static int
+dtrace_helper_provider_validate(dof_hdr_t *dof, dof_sec_t *sec)
+{
+	uintptr_t daddr = (uintptr_t)dof;
+	dof_sec_t *str_sec, *prb_sec, *arg_sec, *off_sec, *enoff_sec;
+	dof_provider_t *provider;
+	dof_probe_t *probe;
+	uint8_t *arg;
+	char *strtab, *typestr;
+	dof_stridx_t typeidx;
+	size_t typesz;
+	uint_t nprobes, j, k;
+
+	ASSERT(sec->dofs_type == DOF_SECT_PROVIDER);
+
+	if (sec->dofs_offset & (sizeof (uint_t) - 1)) {
+		dtrace_dof_error(dof, "misaligned section offset");
+		return (-1);
+	}
+
+	/*
+	 * The section needs to be large enough to contain the DOF provider
+	 * structure appropriate for the given version.
+	 */
+	if (sec->dofs_size <
+	    ((dof->dofh_ident[DOF_ID_VERSION] == DOF_VERSION_1) ?
+	    offsetof(dof_provider_t, dofpv_prenoffs) :
+	    sizeof (dof_provider_t))) {
+		dtrace_dof_error(dof, "provider section too small");
+		return (-1);
+	}
+
+	provider = (dof_provider_t *)(uintptr_t)(daddr + sec->dofs_offset);
+	str_sec = dtrace_dof_sect(dof, DOF_SECT_STRTAB, provider->dofpv_strtab);
+	prb_sec = dtrace_dof_sect(dof, DOF_SECT_PROBES, provider->dofpv_probes);
+	arg_sec = dtrace_dof_sect(dof, DOF_SECT_PRARGS, provider->dofpv_prargs);
+	off_sec = dtrace_dof_sect(dof, DOF_SECT_PROFFS, provider->dofpv_proffs);
+
+	if (str_sec == NULL || prb_sec == NULL ||
+	    arg_sec == NULL || off_sec == NULL)
+		return (-1);
+
+	enoff_sec = NULL;
+
+	if (dof->dofh_ident[DOF_ID_VERSION] != DOF_VERSION_1 &&
+	    provider->dofpv_prenoffs != DOF_SECT_NONE &&
+	    (enoff_sec = dtrace_dof_sect(dof, DOF_SECT_PRENOFFS,
+	    provider->dofpv_prenoffs)) == NULL)
+		return (-1);
+
+	strtab = (char *)(uintptr_t)(daddr + str_sec->dofs_offset);
+
+	if (provider->dofpv_name >= str_sec->dofs_size ||
+	    strlen(strtab + provider->dofpv_name) >= DTRACE_PROVNAMELEN) {
+		dtrace_dof_error(dof, "invalid provider name");
+		return (-1);
+	}
+
+	if (prb_sec->dofs_entsize == 0 ||
+	    prb_sec->dofs_entsize > prb_sec->dofs_size) {
+		dtrace_dof_error(dof, "invalid entry size");
+		return (-1);
+	}
+
+	if (prb_sec->dofs_entsize & (sizeof (uintptr_t) - 1)) {
+		dtrace_dof_error(dof, "misaligned entry size");
+		return (-1);
+	}
+
+	if (off_sec->dofs_entsize != sizeof (uint32_t)) {
+		dtrace_dof_error(dof, "invalid entry size");
+		return (-1);
+	}
+
+	if (off_sec->dofs_offset & (sizeof (uint32_t) - 1)) {
+		dtrace_dof_error(dof, "misaligned section offset");
+		return (-1);
+	}
+
+	if (arg_sec->dofs_entsize != sizeof (uint8_t)) {
+		dtrace_dof_error(dof, "invalid entry size");
+		return (-1);
+	}
+
+	arg = (uint8_t *)(uintptr_t)(daddr + arg_sec->dofs_offset);
+
+	nprobes = prb_sec->dofs_size / prb_sec->dofs_entsize;
+
+	/*
+	 * Take a pass through the probes to check for errors.
+	 */
+	for (j = 0; j < nprobes; j++) {
+		probe = (dof_probe_t *)(uintptr_t)(daddr +
+		    prb_sec->dofs_offset + j * prb_sec->dofs_entsize);
+
+		if (probe->dofpr_func >= str_sec->dofs_size) {
+			dtrace_dof_error(dof, "invalid function name");
+			return (-1);
+		}
+
+		if (strlen(strtab + probe->dofpr_func) >= DTRACE_FUNCNAMELEN) {
+			dtrace_dof_error(dof, "function name too long");
+			return (-1);
+		}
+
+		if (probe->dofpr_name >= str_sec->dofs_size ||
+		    strlen(strtab + probe->dofpr_name) >= DTRACE_NAMELEN) {
+			dtrace_dof_error(dof, "invalid probe name");
+			return (-1);
+		}
+
+		/*
+		 * The offset count must not wrap the index, and the offsets
+		 * must also not overflow the section's data.
+		 */
+		if (probe->dofpr_offidx + probe->dofpr_noffs <
+		    probe->dofpr_offidx ||
+		    (probe->dofpr_offidx + probe->dofpr_noffs) *
+		    off_sec->dofs_entsize > off_sec->dofs_size) {
+			dtrace_dof_error(dof, "invalid probe offset");
+			return (-1);
+		}
+
+		if (dof->dofh_ident[DOF_ID_VERSION] != DOF_VERSION_1) {
+			/*
+			 * If there's no is-enabled offset section, make sure
+			 * there aren't any is-enabled offsets. Otherwise
+			 * perform the same checks as for probe offsets
+			 * (immediately above).
+			 */
+			if (enoff_sec == NULL) {
+				if (probe->dofpr_enoffidx != 0 ||
+				    probe->dofpr_nenoffs != 0) {
+					dtrace_dof_error(dof, "is-enabled "
+					    "offsets with null section");
+					return (-1);
+				}
+			} else if (probe->dofpr_enoffidx +
+			    probe->dofpr_nenoffs < probe->dofpr_enoffidx ||
+			    (probe->dofpr_enoffidx + probe->dofpr_nenoffs) *
+			    enoff_sec->dofs_entsize > enoff_sec->dofs_size) {
+				dtrace_dof_error(dof, "invalid is-enabled "
+				    "offset");
+				return (-1);
+			}
+
+			if (probe->dofpr_noffs + probe->dofpr_nenoffs == 0) {
+				dtrace_dof_error(dof, "zero probe and "
+				    "is-enabled offsets");
+				return (-1);
+			}
+		} else if (probe->dofpr_noffs == 0) {
+			dtrace_dof_error(dof, "zero probe offsets");
+			return (-1);
+		}
+
+		if (probe->dofpr_argidx + probe->dofpr_xargc <
+		    probe->dofpr_argidx ||
+		    (probe->dofpr_argidx + probe->dofpr_xargc) *
+		    arg_sec->dofs_entsize > arg_sec->dofs_size) {
+			dtrace_dof_error(dof, "invalid args");
+			return (-1);
+		}
+
+		typeidx = probe->dofpr_nargv;
+		typestr = strtab + probe->dofpr_nargv;
+		for (k = 0; k < probe->dofpr_nargc; k++) {
+			if (typeidx >= str_sec->dofs_size) {
+				dtrace_dof_error(dof, "bad "
+				    "native argument type");
+				return (-1);
+			}
+
+			typesz = strlen(typestr) + 1;
+			if (typesz > DTRACE_ARGTYPELEN) {
+				dtrace_dof_error(dof, "native "
+				    "argument type too long");
+				return (-1);
+			}
+			typeidx += typesz;
+			typestr += typesz;
+		}
+
+		typeidx = probe->dofpr_xargv;
+		typestr = strtab + probe->dofpr_xargv;
+		for (k = 0; k < probe->dofpr_xargc; k++) {
+			if (arg[probe->dofpr_argidx + k] > probe->dofpr_nargc) {
+				dtrace_dof_error(dof, "bad "
+				    "native argument index");
+				return (-1);
+			}
+
+			if (typeidx >= str_sec->dofs_size) {
+				dtrace_dof_error(dof, "bad "
+				    "translated argument type");
+				return (-1);
+			}
+
+			typesz = strlen(typestr) + 1;
+			if (typesz > DTRACE_ARGTYPELEN) {
+				dtrace_dof_error(dof, "translated argument "
+				    "type too long");
+				return (-1);
+			}
+
+			typeidx += typesz;
+			typestr += typesz;
+		}
+	}
+
+	return (0);
+}
+
+static int
+dtrace_helper_slurp(dof_hdr_t *dof, dof_helper_t *dhp)
+{
+	dtrace_helpers_t *help;
+	dtrace_vstate_t *vstate;
+	dtrace_enabling_t *enab = NULL;
+	int i, gen, rv, nhelpers = 0, nprovs = 0, destroy = 1;
+	uintptr_t daddr = (uintptr_t)dof;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+
+	if ((help = curproc->p_dtrace_helpers) == NULL)
+		help = dtrace_helpers_create(curproc);
+
+	vstate = &help->dthps_vstate;
+
+	if ((rv = dtrace_dof_slurp(dof, vstate, NULL, &enab,
+	    dhp != NULL ? dhp->dofhp_addr : 0, B_FALSE)) != 0) {
+		dtrace_dof_destroy(dof);
+		return (rv);
+	}
+
+	/*
+	 * Look for helper providers and validate their descriptions.
+	 */
+	if (dhp != NULL) {
+		for (i = 0; i < dof->dofh_secnum; i++) {
+			dof_sec_t *sec = (dof_sec_t *)(uintptr_t)(daddr +
+			    dof->dofh_secoff + i * dof->dofh_secsize);
+
+			if (sec->dofs_type != DOF_SECT_PROVIDER)
+				continue;
+
+			if (dtrace_helper_provider_validate(dof, sec) != 0) {
+				dtrace_enabling_destroy(enab);
+				dtrace_dof_destroy(dof);
+				return (-1);
+			}
+
+			nprovs++;
+		}
+	}
+
+	/*
+	 * Now we need to walk through the ECB descriptions in the enabling.
+	 */
+	for (i = 0; i < enab->dten_ndesc; i++) {
+		dtrace_ecbdesc_t *ep = enab->dten_desc[i];
+		dtrace_probedesc_t *desc = &ep->dted_probe;
+
+		if (strcmp(desc->dtpd_provider, "dtrace") != 0)
+			continue;
+
+		if (strcmp(desc->dtpd_mod, "helper") != 0)
+			continue;
+
+		if (strcmp(desc->dtpd_func, "ustack") != 0)
+			continue;
+
+		if ((rv = dtrace_helper_action_add(DTRACE_HELPER_ACTION_USTACK,
+		    ep)) != 0) {
+			/*
+			 * Adding this helper action failed -- we are now going
+			 * to rip out the entire generation and return failure.
+			 */
+			(void) dtrace_helper_destroygen(help->dthps_generation);
+			dtrace_enabling_destroy(enab);
+			dtrace_dof_destroy(dof);
+			return (-1);
+		}
+
+		nhelpers++;
+	}
+
+	if (nhelpers < enab->dten_ndesc)
+		dtrace_dof_error(dof, "unmatched helpers");
+
+	gen = help->dthps_generation++;
+	dtrace_enabling_destroy(enab);
+
+	if (dhp != NULL && nprovs > 0) {
+		dhp->dofhp_dof = (uint64_t)(uintptr_t)dof;
+		if (dtrace_helper_provider_add(dhp, gen) == 0) {
+			mutex_exit(&dtrace_lock);
+			dtrace_helper_provider_register(curproc, help, dhp);
+			mutex_enter(&dtrace_lock);
+
+			destroy = 0;
+		}
+	}
+
+	if (destroy)
+		dtrace_dof_destroy(dof);
+
+	return (gen);
+}
+
+static dtrace_helpers_t *
+dtrace_helpers_create(proc_t *p)
+{
+	dtrace_helpers_t *help;
+
+	ASSERT(MUTEX_HELD(&dtrace_lock));
+	ASSERT(p->p_dtrace_helpers == NULL);
+
+	help = kmem_zalloc(sizeof (dtrace_helpers_t), KM_SLEEP);
+	help->dthps_actions = kmem_zalloc(sizeof (dtrace_helper_action_t *) *
+	    DTRACE_NHELPER_ACTIONS, KM_SLEEP);
+
+	p->p_dtrace_helpers = help;
+	dtrace_helpers++;
+
+	return (help);
+}
+
+static void
+dtrace_helpers_destroy(void)
+{
+	dtrace_helpers_t *help;
+	dtrace_vstate_t *vstate;
+	proc_t *p = curproc;
+	int i;
+
+	mutex_enter(&dtrace_lock);
+
+	ASSERT(p->p_dtrace_helpers != NULL);
+	ASSERT(dtrace_helpers > 0);
+
+	help = p->p_dtrace_helpers;
+	vstate = &help->dthps_vstate;
+
+	/*
+	 * We're now going to lose the help from this process.
+	 */
+	p->p_dtrace_helpers = NULL;
+	dtrace_sync();
+
+	/*
+	 * Destory the helper actions.
+	 */
+	for (i = 0; i < DTRACE_NHELPER_ACTIONS; i++) {
+		dtrace_helper_action_t *h, *next;
+
+		for (h = help->dthps_actions[i]; h != NULL; h = next) {
+			next = h->dtha_next;
+			dtrace_helper_action_destroy(h, vstate);
+			h = next;
+		}
+	}
+
+	mutex_exit(&dtrace_lock);
+
+	/*
+	 * Destroy the helper providers.
+	 */
+	if (help->dthps_maxprovs > 0) {
+		mutex_enter(&dtrace_meta_lock);
+		if (dtrace_meta_pid != NULL) {
+			ASSERT(dtrace_deferred_pid == NULL);
+
+			for (i = 0; i < help->dthps_nprovs; i++) {
+				dtrace_helper_provider_remove(
+				    &help->dthps_provs[i]->dthp_prov, p->p_pid);
+			}
+		} else {
+			mutex_enter(&dtrace_lock);
+			ASSERT(help->dthps_deferred == 0 ||
+			    help->dthps_next != NULL ||
+			    help->dthps_prev != NULL ||
+			    help == dtrace_deferred_pid);
+
+			/*
+			 * Remove the helper from the deferred list.
+			 */
+			if (help->dthps_next != NULL)
+				help->dthps_next->dthps_prev = help->dthps_prev;
+			if (help->dthps_prev != NULL)
+				help->dthps_prev->dthps_next = help->dthps_next;
+			if (dtrace_deferred_pid == help) {
+				dtrace_deferred_pid = help->dthps_next;
+				ASSERT(help->dthps_prev == NULL);
+			}
+
+			mutex_exit(&dtrace_lock);
+		}
+
+		mutex_exit(&dtrace_meta_lock);
+
+		for (i = 0; i < help->dthps_nprovs; i++) {
+			dtrace_helper_provider_destroy(help->dthps_provs[i]);
+		}
+
+		kmem_free(help->dthps_provs, help->dthps_maxprovs *
+		    sizeof (dtrace_helper_provider_t *));
+	}
+
+	mutex_enter(&dtrace_lock);
+
+	dtrace_vstate_fini(&help->dthps_vstate);
+	kmem_free(help->dthps_actions,
+	    sizeof (dtrace_helper_action_t *) * DTRACE_NHELPER_ACTIONS);
+	kmem_free(help, sizeof (dtrace_helpers_t));
+
+	--dtrace_helpers;
+	mutex_exit(&dtrace_lock);
+}
+
+static void
+dtrace_helpers_duplicate(proc_t *from, proc_t *to)
+{
+	dtrace_helpers_t *help, *newhelp;
+	dtrace_helper_action_t *helper, *new, *last;
+	dtrace_difo_t *dp;
+	dtrace_vstate_t *vstate;
+	int i, j, sz, hasprovs = 0;
+
+	mutex_enter(&dtrace_lock);
+	ASSERT(from->p_dtrace_helpers != NULL);
+	ASSERT(dtrace_helpers > 0);
+
+	help = from->p_dtrace_helpers;
+	newhelp = dtrace_helpers_create(to);
+	ASSERT(to->p_dtrace_helpers != NULL);
+
+	newhelp->dthps_generation = help->dthps_generation;
+	vstate = &newhelp->dthps_vstate;
+
+	/*
+	 * Duplicate the helper actions.
+	 */
+	for (i = 0; i < DTRACE_NHELPER_ACTIONS; i++) {
+		if ((helper = help->dthps_actions[i]) == NULL)
+			continue;
+
+		for (last = NULL; helper != NULL; helper = helper->dtha_next) {
+			new = kmem_zalloc(sizeof (dtrace_helper_action_t),
+			    KM_SLEEP);
+			new->dtha_generation = helper->dtha_generation;
+
+			if ((dp = helper->dtha_predicate) != NULL) {
+				dp = dtrace_difo_duplicate(dp, vstate);
+				new->dtha_predicate = dp;
+			}
+
+			new->dtha_nactions = helper->dtha_nactions;
+			sz = sizeof (dtrace_difo_t *) * new->dtha_nactions;
+			new->dtha_actions = kmem_alloc(sz, KM_SLEEP);
+
+			for (j = 0; j < new->dtha_nactions; j++) {
+				dtrace_difo_t *dp = helper->dtha_actions[j];
+
+				ASSERT(dp != NULL);
+				dp = dtrace_difo_duplicate(dp, vstate);
+				new->dtha_actions[j] = dp;
+			}
+
+			if (last != NULL) {
+				last->dtha_next = new;
+			} else {
+				newhelp->dthps_actions[i] = new;
+			}
+
+			last = new;
+		}
+	}
+
+	/*
+	 * Duplicate the helper providers and register them with the
+	 * DTrace framework.
+	 */
+	if (help->dthps_nprovs > 0) {
+		newhelp->dthps_nprovs = help->dthps_nprovs;
+		newhelp->dthps_maxprovs = help->dthps_nprovs;
+		newhelp->dthps_provs = kmem_alloc(newhelp->dthps_nprovs *
+		    sizeof (dtrace_helper_provider_t *), KM_SLEEP);
+		for (i = 0; i < newhelp->dthps_nprovs; i++) {
+			newhelp->dthps_provs[i] = help->dthps_provs[i];
+			newhelp->dthps_provs[i]->dthp_ref++;
+		}
+
+		hasprovs = 1;
+	}
+
+	mutex_exit(&dtrace_lock);
+
+	if (hasprovs)
+		dtrace_helper_provider_register(to, newhelp, NULL);
+}
+
+/*
+ * DTrace Hook Functions
+ */
+static void
+dtrace_module_loaded(struct modctl *ctl)
+{
+	dtrace_provider_t *prv;
+
+	mutex_enter(&dtrace_provider_lock);
+	mutex_enter(&mod_lock);
+
+	ASSERT(ctl->mod_busy);
+
+	/*
+	 * We're going to call each providers per-module provide operation
+	 * specifying only this module.
+	 */
+	for (prv = dtrace_provider; prv != NULL; prv = prv->dtpv_next)
+		prv->dtpv_pops.dtps_provide_module(prv->dtpv_arg, ctl);
+
+	mutex_exit(&mod_lock);
+	mutex_exit(&dtrace_provider_lock);
+
+	/*
+	 * If we have any retained enablings, we need to match against them.
+	 * Enabling probes requires that cpu_lock be held, and we cannot hold
+	 * cpu_lock here -- it is legal for cpu_lock to be held when loading a
+	 * module.  (In particular, this happens when loading scheduling
+	 * classes.)  So if we have any retained enablings, we need to dispatch
+	 * our task queue to do the match for us.
+	 */
+	mutex_enter(&dtrace_lock);
+
+	if (dtrace_retained == NULL) {
+		mutex_exit(&dtrace_lock);
+		return;
+	}
+
+	(void) taskq_dispatch(dtrace_taskq,
+	    (task_func_t *)dtrace_enabling_matchall, NULL, TQ_SLEEP);
+
+	mutex_exit(&dtrace_lock);
+
+	/*
+	 * And now, for a little heuristic sleaze:  in general, we want to
+	 * match modules as soon as they load.  However, we cannot guarantee
+	 * this, because it would lead us to the lock ordering violation
+	 * outlined above.  The common case, of course, is that cpu_lock is
+	 * _not_ held -- so we delay here for a clock tick, hoping that that's
+	 * long enough for the task queue to do its work.  If it's not, it's
+	 * not a serious problem -- it just means that the module that we
+	 * just loaded may not be immediately instrumentable.
+	 */
+	delay(1);
+}
+
+static void
+dtrace_module_unloaded(struct modctl *ctl)
+{
+	dtrace_probe_t template, *probe, *first, *next;
+	dtrace_provider_t *prov;
+
+	template.dtpr_mod = ctl->mod_modname;
+
+	mutex_enter(&dtrace_provider_lock);
+	mutex_enter(&mod_lock);
+	mutex_enter(&dtrace_lock);
+
+	if (dtrace_bymod == NULL) {
+		/*
+		 * The DTrace module is loaded (obviously) but not attached;
+		 * we don't have any work to do.
+		 */
+		mutex_exit(&dtrace_provider_lock);
+		mutex_exit(&mod_lock);
+		mutex_exit(&dtrace_lock);
+		return;
+	}
+
+	for (probe = first = dtrace_hash_lookup(dtrace_bymod, &template);
+	    probe != NULL; probe = probe->dtpr_nextmod) {
+		if (probe->dtpr_ecb != NULL) {
+			mutex_exit(&dtrace_provider_lock);
+			mutex_exit(&mod_lock);
+			mutex_exit(&dtrace_lock);
+
+			/*
+			 * This shouldn't _actually_ be possible -- we're
+			 * unloading a module that has an enabled probe in it.
+			 * (It's normally up to the provider to make sure that
+			 * this can't happen.)  However, because dtps_enable()
+			 * doesn't have a failure mode, there can be an
+			 * enable/unload race.  Upshot:  we don't want to
+			 * assert, but we're not going to disable the
+			 * probe, either.
+			 */
+			if (dtrace_err_verbose) {
+				cmn_err(CE_WARN, "unloaded module '%s' had "
+				    "enabled probes", ctl->mod_modname);
+			}
+
+			return;
+		}
+	}
+
+	probe = first;
+
+	for (first = NULL; probe != NULL; probe = next) {
+		ASSERT(dtrace_probes[probe->dtpr_id - 1] == probe);
+
+		dtrace_probes[probe->dtpr_id - 1] = NULL;
+
+		next = probe->dtpr_nextmod;
+		dtrace_hash_remove(dtrace_bymod, probe);
+		dtrace_hash_remove(dtrace_byfunc, probe);
+		dtrace_hash_remove(dtrace_byname, probe);
+
+		if (first == NULL) {
+			first = probe;
+			probe->dtpr_nextmod = NULL;
+		} else {
+			probe->dtpr_nextmod = first;
+			first = probe;
+		}
+	}
+
+	/*
+	 * We've removed all of the module's probes from the hash chains and
+	 * from the probe array.  Now issue a dtrace_sync() to be sure that
+	 * everyone has cleared out from any probe array processing.
+	 */
+	dtrace_sync();
+
+	for (probe = first; probe != NULL; probe = first) {
+		first = probe->dtpr_nextmod;
+		prov = probe->dtpr_provider;
+		prov->dtpv_pops.dtps_destroy(prov->dtpv_arg, probe->dtpr_id,
+		    probe->dtpr_arg);
+		kmem_free(probe->dtpr_mod, strlen(probe->dtpr_mod) + 1);
+		kmem_free(probe->dtpr_func, strlen(probe->dtpr_func) + 1);
+		kmem_free(probe->dtpr_name, strlen(probe->dtpr_name) + 1);
+		vmem_free(dtrace_arena, (void *)(uintptr_t)probe->dtpr_id, 1);
+		kmem_free(probe, sizeof (dtrace_probe_t));
+	}
+
+	mutex_exit(&dtrace_lock);
+	mutex_exit(&mod_lock);
+	mutex_exit(&dtrace_provider_lock);
+}
+
+void
+dtrace_suspend(void)
+{
+	dtrace_probe_foreach(offsetof(dtrace_pops_t, dtps_suspend));
+}
+
+void
+dtrace_resume(void)
+{
+	dtrace_probe_foreach(offsetof(dtrace_pops_t, dtps_resume));
+}
+
+static int
+dtrace_cpu_setup(cpu_setup_t what, processorid_t cpu)
+{
+	ASSERT(MUTEX_HELD(&cpu_lock));
+	mutex_enter(&dtrace_lock);
+
+	switch (what) {
+	case CPU_CONFIG: {
+		dtrace_state_t *state;
+		dtrace_optval_t *opt, rs, c;
+
+		/*
+		 * For now, we only allocate a new buffer for anonymous state.
+		 */
+		if ((state = dtrace_anon.dta_state) == NULL)
+			break;
+
+		if (state->dts_activity != DTRACE_ACTIVITY_ACTIVE)
+			break;
+
+		opt = state->dts_options;
+		c = opt[DTRACEOPT_CPU];
+
+		if (c != DTRACE_CPUALL && c != DTRACEOPT_UNSET && c != cpu)
+			break;
+
+		/*
+		 * Regardless of what the actual policy is, we're going to
+		 * temporarily set our resize policy to be manual.  We're
+		 * also going to temporarily set our CPU option to denote
+		 * the newly configured CPU.
+		 */
+		rs = opt[DTRACEOPT_BUFRESIZE];
+		opt[DTRACEOPT_BUFRESIZE] = DTRACEOPT_BUFRESIZE_MANUAL;
+		opt[DTRACEOPT_CPU] = (dtrace_optval_t)cpu;
+
+		(void) dtrace_state_buffers(state);
+
+		opt[DTRACEOPT_BUFRESIZE] = rs;
+		opt[DTRACEOPT_CPU] = c;
+
+		break;
+	}
+
+	case CPU_UNCONFIG:
+		/*
+		 * We don't free the buffer in the CPU_UNCONFIG case.  (The
+		 * buffer will be freed when the consumer exits.)
+		 */
+		break;
+
+	default:
+		break;
+	}
+
+	mutex_exit(&dtrace_lock);
+	return (0);
+}
+
+static void
+dtrace_cpu_setup_initial(processorid_t cpu)
+{
+	(void) dtrace_cpu_setup(CPU_CONFIG, cpu);
+}
+
+static void
+dtrace_toxrange_add(uintptr_t base, uintptr_t limit)
+{
+	if (dtrace_toxranges >= dtrace_toxranges_max) {
+		int osize, nsize;
+		dtrace_toxrange_t *range;
+
+		osize = dtrace_toxranges_max * sizeof (dtrace_toxrange_t);
+
+		if (osize == 0) {
+			ASSERT(dtrace_toxrange == NULL);
+			ASSERT(dtrace_toxranges_max == 0);
+			dtrace_toxranges_max = 1;
+		} else {
+			dtrace_toxranges_max <<= 1;
+		}
+
+		nsize = dtrace_toxranges_max * sizeof (dtrace_toxrange_t);
+		range = kmem_zalloc(nsize, KM_SLEEP);
+
+		if (dtrace_toxrange != NULL) {
+			ASSERT(osize != 0);
+			bcopy(dtrace_toxrange, range, osize);
+			kmem_free(dtrace_toxrange, osize);
+		}
+
+		dtrace_toxrange = range;
+	}
+
+	ASSERT(dtrace_toxrange[dtrace_toxranges].dtt_base == NULL);
+	ASSERT(dtrace_toxrange[dtrace_toxranges].dtt_limit == NULL);
+
+	dtrace_toxrange[dtrace_toxranges].dtt_base = base;
+	dtrace_toxrange[dtrace_toxranges].dtt_limit = limit;
+	dtrace_toxranges++;
+}
+
+/*
+ * DTrace Driver Cookbook Functions
+ */
+/*ARGSUSED*/
+static int
+dtrace_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
+{
+	dtrace_provider_id_t id;
+	dtrace_state_t *state = NULL;
+	dtrace_enabling_t *enab;
+
+	mutex_enter(&cpu_lock);
+	mutex_enter(&dtrace_provider_lock);
+	mutex_enter(&dtrace_lock);
+
+	if (ddi_soft_state_init(&dtrace_softstate,
+	    sizeof (dtrace_state_t), 0) != 0) {
+		cmn_err(CE_NOTE, "/dev/dtrace failed to initialize soft state");
+		mutex_exit(&cpu_lock);
+		mutex_exit(&dtrace_provider_lock);
+		mutex_exit(&dtrace_lock);
+		return (DDI_FAILURE);
+	}
+
+	if (ddi_create_minor_node(devi, DTRACEMNR_DTRACE, S_IFCHR,
+	    DTRACEMNRN_DTRACE, DDI_PSEUDO, NULL) == DDI_FAILURE ||
+	    ddi_create_minor_node(devi, DTRACEMNR_HELPER, S_IFCHR,
+	    DTRACEMNRN_HELPER, DDI_PSEUDO, NULL) == DDI_FAILURE) {
+		cmn_err(CE_NOTE, "/dev/dtrace couldn't create minor nodes");
+		ddi_remove_minor_node(devi, NULL);
+		ddi_soft_state_fini(&dtrace_softstate);
+		mutex_exit(&cpu_lock);
+		mutex_exit(&dtrace_provider_lock);
+		mutex_exit(&dtrace_lock);
+		return (DDI_FAILURE);
+	}
+
+	ddi_report_dev(devi);
+	dtrace_devi = devi;
+
+	dtrace_modload = dtrace_module_loaded;
+	dtrace_modunload = dtrace_module_unloaded;
+	dtrace_cpu_init = dtrace_cpu_setup_initial;
+	dtrace_helpers_cleanup = dtrace_helpers_destroy;
+	dtrace_helpers_fork = dtrace_helpers_duplicate;
+	dtrace_cpustart_init = dtrace_suspend;
+	dtrace_cpustart_fini = dtrace_resume;
+	dtrace_debugger_init = dtrace_suspend;
+	dtrace_debugger_fini = dtrace_resume;
+
+	register_cpu_setup_func((cpu_setup_func_t *)dtrace_cpu_setup, NULL);
+
+	ASSERT(MUTEX_HELD(&cpu_lock));
+
+	dtrace_arena = vmem_create("dtrace", (void *)1, UINT32_MAX, 1,
+	    NULL, NULL, NULL, 0, VM_SLEEP | VMC_IDENTIFIER);
+	dtrace_minor = vmem_create("dtrace_minor", (void *)DTRACEMNRN_CLONE,
+	    UINT32_MAX - DTRACEMNRN_CLONE, 1, NULL, NULL, NULL, 0,
+	    VM_SLEEP | VMC_IDENTIFIER);
+	dtrace_taskq = taskq_create("dtrace_taskq", 1, maxclsyspri,
+	    1, INT_MAX, 0);
+
+	dtrace_state_cache = kmem_cache_create("dtrace_state_cache",
+	    sizeof (dtrace_dstate_percpu_t) * NCPU, DTRACE_STATE_ALIGN,
+	    NULL, NULL, NULL, NULL, NULL, 0);
+
+	ASSERT(MUTEX_HELD(&cpu_lock));
+	dtrace_bymod = dtrace_hash_create(offsetof(dtrace_probe_t, dtpr_mod),
+	    offsetof(dtrace_probe_t, dtpr_nextmod),
+	    offsetof(dtrace_probe_t, dtpr_prevmod));
+
+	dtrace_byfunc = dtrace_hash_create(offsetof(dtrace_probe_t, dtpr_func),
+	    offsetof(dtrace_probe_t, dtpr_nextfunc),
+	    offsetof(dtrace_probe_t, dtpr_prevfunc));
+
+	dtrace_byname = dtrace_hash_create(offsetof(dtrace_probe_t, dtpr_name),
+	    offsetof(dtrace_probe_t, dtpr_nextname),
+	    offsetof(dtrace_probe_t, dtpr_prevname));
+
+	if (dtrace_retain_max < 1) {
+		cmn_err(CE_WARN, "illegal value (%lu) for dtrace_retain_max; "
+		    "setting to 1", dtrace_retain_max);
+		dtrace_retain_max = 1;
+	}
+
+	/*
+	 * Now discover our toxic ranges.
+	 */
+	dtrace_toxic_ranges(dtrace_toxrange_add);
+
+	/*
+	 * Before we register ourselves as a provider to our own framework,
+	 * we would like to assert that dtrace_provider is NULL -- but that's
+	 * not true if we were loaded as a dependency of a DTrace provider.
+	 * Once we've registered, we can assert that dtrace_provider is our
+	 * pseudo provider.
+	 */
+	(void) dtrace_register("dtrace", &dtrace_provider_attr,
+	    DTRACE_PRIV_NONE, 0, &dtrace_provider_ops, NULL, &id);
+
+	ASSERT(dtrace_provider != NULL);
+	ASSERT((dtrace_provider_id_t)dtrace_provider == id);
+
+	dtrace_probeid_begin = dtrace_probe_create((dtrace_provider_id_t)
+	    dtrace_provider, NULL, NULL, "BEGIN", 0, NULL);
+	dtrace_probeid_end = dtrace_probe_create((dtrace_provider_id_t)
+	    dtrace_provider, NULL, NULL, "END", 0, NULL);
+	dtrace_probeid_error = dtrace_probe_create((dtrace_provider_id_t)
+	    dtrace_provider, NULL, NULL, "ERROR", 1, NULL);
+
+	dtrace_anon_property();
+	mutex_exit(&cpu_lock);
+
+	/*
+	 * If DTrace helper tracing is enabled, we need to allocate the
+	 * trace buffer and initialize the values.
+	 */
+	if (dtrace_helptrace_enabled) {
+		ASSERT(dtrace_helptrace_buffer == NULL);
+		dtrace_helptrace_buffer =
+		    kmem_zalloc(dtrace_helptrace_bufsize, KM_SLEEP);
+		dtrace_helptrace_next = 0;
+	}
+
+	/*
+	 * If there are already providers, we must ask them to provide their
+	 * probes, and then match any anonymous enabling against them.  Note
+	 * that there should be no other retained enablings at this time:
+	 * the only retained enablings at this time should be the anonymous
+	 * enabling.
+	 */
+	if (dtrace_anon.dta_enabling != NULL) {
+		ASSERT(dtrace_retained == dtrace_anon.dta_enabling);
+
+		dtrace_enabling_provide(NULL);
+		state = dtrace_anon.dta_state;
+
+		/*
+		 * We couldn't hold cpu_lock across the above call to
+		 * dtrace_enabling_provide(), but we must hold it to actually
+		 * enable the probes.  We have to drop all of our locks, pick
+		 * up cpu_lock, and regain our locks before matching the
+		 * retained anonymous enabling.
+		 */
+		mutex_exit(&dtrace_lock);
+		mutex_exit(&dtrace_provider_lock);
+
+		mutex_enter(&cpu_lock);
+		mutex_enter(&dtrace_provider_lock);
+		mutex_enter(&dtrace_lock);
+
+		if ((enab = dtrace_anon.dta_enabling) != NULL)
+			(void) dtrace_enabling_match(enab, NULL);
+
+		mutex_exit(&cpu_lock);
+	}
+
+	mutex_exit(&dtrace_lock);
+	mutex_exit(&dtrace_provider_lock);
+
+	if (state != NULL) {
+		/*
+		 * If we created any anonymous state, set it going now.
+		 */
+		(void) dtrace_state_go(state, &dtrace_anon.dta_beganon);
+	}
+
+	return (DDI_SUCCESS);
+}
+
+/*ARGSUSED*/
+static int
+dtrace_open(dev_t *devp, int flag, int otyp, cred_t *cred_p)
+{
+	dtrace_state_t *state;
+	uint32_t priv;
+	uid_t uid;
+	zoneid_t zoneid;
+
+	if (getminor(*devp) == DTRACEMNRN_HELPER)
+		return (0);
+
+	/*
+	 * If this wasn't an open with the "helper" minor, then it must be
+	 * the "dtrace" minor.
+	 */
+	ASSERT(getminor(*devp) == DTRACEMNRN_DTRACE);
+
+	/*
+	 * If no DTRACE_PRIV_* bits are set in the credential, then the
+	 * caller lacks sufficient permission to do anything with DTrace.
+	 */
+	dtrace_cred2priv(cred_p, &priv, &uid, &zoneid);
+	if (priv == DTRACE_PRIV_NONE)
+		return (EACCES);
+
+	/*
+	 * Ask all providers to provide all their probes.
+	 */
+	mutex_enter(&dtrace_provider_lock);
+	dtrace_probe_provide(NULL, NULL);
+	mutex_exit(&dtrace_provider_lock);
+
+	mutex_enter(&cpu_lock);
+	mutex_enter(&dtrace_lock);
+	dtrace_opens++;
+	dtrace_membar_producer();
+
+	/*
+	 * If the kernel debugger is active (that is, if the kernel debugger
+	 * modified text in some way), we won't allow the open.
+	 */
+	if (kdi_dtrace_set(KDI_DTSET_DTRACE_ACTIVATE) != 0) {
+		dtrace_opens--;
+		mutex_exit(&cpu_lock);
+		mutex_exit(&dtrace_lock);
+		return (EBUSY);
+	}
+
+	state = dtrace_state_create(devp, cred_p);
+	mutex_exit(&cpu_lock);
+
+	if (state == NULL) {
+		if (--dtrace_opens == 0)
+			(void) kdi_dtrace_set(KDI_DTSET_DTRACE_DEACTIVATE);
+		mutex_exit(&dtrace_lock);
+		return (EAGAIN);
+	}
+
+	mutex_exit(&dtrace_lock);
+
+	return (0);
+}
+
+/*ARGSUSED*/
+static int
+dtrace_close(dev_t dev, int flag, int otyp, cred_t *cred_p)
+{
+	minor_t minor = getminor(dev);
+	dtrace_state_t *state;
+
+	if (minor == DTRACEMNRN_HELPER)
+		return (0);
+
+	state = ddi_get_soft_state(dtrace_softstate, minor);
+
+	mutex_enter(&cpu_lock);
+	mutex_enter(&dtrace_lock);
+
+	if (state->dts_anon) {
+		/*
+		 * There is anonymous state. Destroy that first.
+		 */
+		ASSERT(dtrace_anon.dta_state == NULL);
+		dtrace_state_destroy(state->dts_anon);
+	}
+
+	dtrace_state_destroy(state);
+	ASSERT(dtrace_opens > 0);
+	if (--dtrace_opens == 0)
+		(void) kdi_dtrace_set(KDI_DTSET_DTRACE_DEACTIVATE);
+
+	mutex_exit(&dtrace_lock);
+	mutex_exit(&cpu_lock);
+
+	return (0);
+}
+
+/*ARGSUSED*/
+static int
+dtrace_ioctl_helper(int cmd, intptr_t arg, int *rv)
+{
+	int rval;
+	dof_helper_t help, *dhp = NULL;
+
+	switch (cmd) {
+	case DTRACEHIOC_ADDDOF:
+		if (copyin((void *)arg, &help, sizeof (help)) != 0) {
+			dtrace_dof_error(NULL, "failed to copyin DOF helper");
+			return (EFAULT);
+		}
+
+		dhp = &help;
+		arg = (intptr_t)help.dofhp_dof;
+		/*FALLTHROUGH*/
+
+	case DTRACEHIOC_ADD: {
+		dof_hdr_t *dof = dtrace_dof_copyin(arg, &rval);
+
+		if (dof == NULL)
+			return (rval);
+
+		mutex_enter(&dtrace_lock);
+
+		/*
+		 * dtrace_helper_slurp() takes responsibility for the dof --
+		 * it may free it now or it may save it and free it later.
+		 */
+		if ((rval = dtrace_helper_slurp(dof, dhp)) != -1) {
+			*rv = rval;
+			rval = 0;
+		} else {
+			rval = EINVAL;
+		}
+
+		mutex_exit(&dtrace_lock);
+		return (rval);
+	}
+
+	case DTRACEHIOC_REMOVE: {
+		mutex_enter(&dtrace_lock);
+		rval = dtrace_helper_destroygen(arg);
+		mutex_exit(&dtrace_lock);
+
+		return (rval);
+	}
+
+	default:
+		break;
+	}
+
+	return (ENOTTY);
+}
+
+/*ARGSUSED*/
+static int
+dtrace_ioctl(dev_t dev, int cmd, intptr_t arg, int md, cred_t *cr, int *rv)
+{
+	minor_t minor = getminor(dev);
+	dtrace_state_t *state;
+	int rval;
+
+	if (minor == DTRACEMNRN_HELPER)
+		return (dtrace_ioctl_helper(cmd, arg, rv));
+
+	state = ddi_get_soft_state(dtrace_softstate, minor);
+
+	if (state->dts_anon) {
+		ASSERT(dtrace_anon.dta_state == NULL);
+		state = state->dts_anon;
+	}
+
+	switch (cmd) {
+	case DTRACEIOC_PROVIDER: {
+		dtrace_providerdesc_t pvd;
+		dtrace_provider_t *pvp;
+
+		if (copyin((void *)arg, &pvd, sizeof (pvd)) != 0)
+			return (EFAULT);
+
+		pvd.dtvd_name[DTRACE_PROVNAMELEN - 1] = '\0';
+		mutex_enter(&dtrace_provider_lock);
+
+		for (pvp = dtrace_provider; pvp != NULL; pvp = pvp->dtpv_next) {
+			if (strcmp(pvp->dtpv_name, pvd.dtvd_name) == 0)
+				break;
+		}
+
+		mutex_exit(&dtrace_provider_lock);
+
+		if (pvp == NULL)
+			return (ESRCH);
+
+		bcopy(&pvp->dtpv_priv, &pvd.dtvd_priv, sizeof (dtrace_ppriv_t));
+		bcopy(&pvp->dtpv_attr, &pvd.dtvd_attr, sizeof (dtrace_pattr_t));
+		if (copyout(&pvd, (void *)arg, sizeof (pvd)) != 0)
+			return (EFAULT);
+
+		return (0);
+	}
+
+	case DTRACEIOC_EPROBE: {
+		dtrace_eprobedesc_t epdesc;
+		dtrace_ecb_t *ecb;
+		dtrace_action_t *act;
+		void *buf;
+		size_t size;
+		uintptr_t dest;
+		int nrecs;
+
+		if (copyin((void *)arg, &epdesc, sizeof (epdesc)) != 0)
+			return (EFAULT);
+
+		mutex_enter(&dtrace_lock);
+
+		if ((ecb = dtrace_epid2ecb(state, epdesc.dtepd_epid)) == NULL) {
+			mutex_exit(&dtrace_lock);
+			return (EINVAL);
+		}
+
+		if (ecb->dte_probe == NULL) {
+			mutex_exit(&dtrace_lock);
+			return (EINVAL);
+		}
+
+		epdesc.dtepd_probeid = ecb->dte_probe->dtpr_id;
+		epdesc.dtepd_uarg = ecb->dte_uarg;
+		epdesc.dtepd_size = ecb->dte_size;
+
+		nrecs = epdesc.dtepd_nrecs;
+		epdesc.dtepd_nrecs = 0;
+		for (act = ecb->dte_action; act != NULL; act = act->dta_next) {
+			if (DTRACEACT_ISAGG(act->dta_kind) || act->dta_intuple)
+				continue;
+
+			epdesc.dtepd_nrecs++;
+		}
+
+		/*
+		 * Now that we have the size, we need to allocate a temporary
+		 * buffer in which to store the complete description.  We need
+		 * the temporary buffer to be able to drop dtrace_lock()
+		 * across the copyout(), below.
+		 */
+		size = sizeof (dtrace_eprobedesc_t) +
+		    (epdesc.dtepd_nrecs * sizeof (dtrace_recdesc_t));
+
+		buf = kmem_alloc(size, KM_SLEEP);
+		dest = (uintptr_t)buf;
+
+		bcopy(&epdesc, (void *)dest, sizeof (epdesc));
+		dest += offsetof(dtrace_eprobedesc_t, dtepd_rec[0]);
+
+		for (act = ecb->dte_action; act != NULL; act = act->dta_next) {
+			if (DTRACEACT_ISAGG(act->dta_kind) || act->dta_intuple)
+				continue;
+
+			if (nrecs-- == 0)
+				break;
+
+			bcopy(&act->dta_rec, (void *)dest,
+			    sizeof (dtrace_recdesc_t));
+			dest += sizeof (dtrace_recdesc_t);
+		}
+
+		mutex_exit(&dtrace_lock);
+
+		if (copyout(buf, (void *)arg, dest - (uintptr_t)buf) != 0) {
+			kmem_free(buf, size);
+			return (EFAULT);
+		}
+
+		kmem_free(buf, size);
+		return (0);
+	}
+
+	case DTRACEIOC_AGGDESC: {
+		dtrace_aggdesc_t aggdesc;
+		dtrace_action_t *act;
+		dtrace_aggregation_t *agg;
+		int nrecs;
+		uint32_t offs;
+		dtrace_recdesc_t *lrec;
+		void *buf;
+		size_t size;
+		uintptr_t dest;
+
+		if (copyin((void *)arg, &aggdesc, sizeof (aggdesc)) != 0)
+			return (EFAULT);
+
+		mutex_enter(&dtrace_lock);
+
+		if ((agg = dtrace_aggid2agg(state, aggdesc.dtagd_id)) == NULL) {
+			mutex_exit(&dtrace_lock);
+			return (EINVAL);
+		}
+
+		aggdesc.dtagd_epid = agg->dtag_ecb->dte_epid;
+
+		nrecs = aggdesc.dtagd_nrecs;
+		aggdesc.dtagd_nrecs = 0;
+
+		offs = agg->dtag_base;
+		lrec = &agg->dtag_action.dta_rec;
+		aggdesc.dtagd_size = lrec->dtrd_offset + lrec->dtrd_size - offs;
+
+		for (act = agg->dtag_first; ; act = act->dta_next) {
+			ASSERT(act->dta_intuple ||
+			    DTRACEACT_ISAGG(act->dta_kind));
+
+			/*
+			 * If this action has a record size of zero, it
+			 * denotes an argument to the aggregating action.
+			 * Because the presence of this record doesn't (or
+			 * shouldn't) affect the way the data is interpreted,
+			 * we don't copy it out to save user-level the
+			 * confusion of dealing with a zero-length record.
+			 */
+			if (act->dta_rec.dtrd_size == 0) {
+				ASSERT(agg->dtag_hasarg);
+				continue;
+			}
+
+			aggdesc.dtagd_nrecs++;
+
+			if (act == &agg->dtag_action)
+				break;
+		}
+
+		/*
+		 * Now that we have the size, we need to allocate a temporary
+		 * buffer in which to store the complete description.  We need
+		 * the temporary buffer to be able to drop dtrace_lock()
+		 * across the copyout(), below.
+		 */
+		size = sizeof (dtrace_aggdesc_t) +
+		    (aggdesc.dtagd_nrecs * sizeof (dtrace_recdesc_t));
+
+		buf = kmem_alloc(size, KM_SLEEP);
+		dest = (uintptr_t)buf;
+
+		bcopy(&aggdesc, (void *)dest, sizeof (aggdesc));
+		dest += offsetof(dtrace_aggdesc_t, dtagd_rec[0]);
+
+		for (act = agg->dtag_first; ; act = act->dta_next) {
+			dtrace_recdesc_t rec = act->dta_rec;
+
+			/*
+			 * See the comment in the above loop for why we pass
+			 * over zero-length records.
+			 */
+			if (rec.dtrd_size == 0) {
+				ASSERT(agg->dtag_hasarg);
+				continue;
+			}
+
+			if (nrecs-- == 0)
+				break;
+
+			rec.dtrd_offset -= offs;
+			bcopy(&rec, (void *)dest, sizeof (rec));
+			dest += sizeof (dtrace_recdesc_t);
+
+			if (act == &agg->dtag_action)
+				break;
+		}
+
+		mutex_exit(&dtrace_lock);
+
+		if (copyout(buf, (void *)arg, dest - (uintptr_t)buf) != 0) {
+			kmem_free(buf, size);
+			return (EFAULT);
+		}
+
+		kmem_free(buf, size);
+		return (0);
+	}
+
+	case DTRACEIOC_ENABLE: {
+		dof_hdr_t *dof;
+		dtrace_enabling_t *enab = NULL;
+		dtrace_vstate_t *vstate;
+		int err = 0;
+
+		*rv = 0;
+
+		/*
+		 * If a NULL argument has been passed, we take this as our
+		 * cue to reevaluate our enablings.
+		 */
+		if (arg == NULL) {
+			mutex_enter(&cpu_lock);
+			mutex_enter(&dtrace_lock);
+			err = dtrace_enabling_matchstate(state, rv);
+			mutex_exit(&dtrace_lock);
+			mutex_exit(&cpu_lock);
+
+			return (err);
+		}
+
+		if ((dof = dtrace_dof_copyin(arg, &rval)) == NULL)
+			return (rval);
+
+		mutex_enter(&cpu_lock);
+		mutex_enter(&dtrace_lock);
+		vstate = &state->dts_vstate;
+
+		if (state->dts_activity != DTRACE_ACTIVITY_INACTIVE) {
+			mutex_exit(&dtrace_lock);
+			mutex_exit(&cpu_lock);
+			dtrace_dof_destroy(dof);
+			return (EBUSY);
+		}
+
+		if (dtrace_dof_slurp(dof, vstate, cr, &enab, 0, B_TRUE) != 0) {
+			mutex_exit(&dtrace_lock);
+			mutex_exit(&cpu_lock);
+			dtrace_dof_destroy(dof);
+			return (EINVAL);
+		}
+
+		if ((rval = dtrace_dof_options(dof, state)) != 0) {
+			dtrace_enabling_destroy(enab);
+			mutex_exit(&dtrace_lock);
+			mutex_exit(&cpu_lock);
+			dtrace_dof_destroy(dof);
+			return (rval);
+		}
+
+		if ((err = dtrace_enabling_match(enab, rv)) == 0) {
+			err = dtrace_enabling_retain(enab);
+		} else {
+			dtrace_enabling_destroy(enab);
+		}
+
+		mutex_exit(&cpu_lock);
+		mutex_exit(&dtrace_lock);
+		dtrace_dof_destroy(dof);
+
+		return (err);
+	}
+
+	case DTRACEIOC_REPLICATE: {
+		dtrace_repldesc_t desc;
+		dtrace_probedesc_t *match = &desc.dtrpd_match;
+		dtrace_probedesc_t *create = &desc.dtrpd_create;
+		int err;
+
+		if (copyin((void *)arg, &desc, sizeof (desc)) != 0)
+			return (EFAULT);
+
+		match->dtpd_provider[DTRACE_PROVNAMELEN - 1] = '\0';
+		match->dtpd_mod[DTRACE_MODNAMELEN - 1] = '\0';
+		match->dtpd_func[DTRACE_FUNCNAMELEN - 1] = '\0';
+		match->dtpd_name[DTRACE_NAMELEN - 1] = '\0';
+
+		create->dtpd_provider[DTRACE_PROVNAMELEN - 1] = '\0';
+		create->dtpd_mod[DTRACE_MODNAMELEN - 1] = '\0';
+		create->dtpd_func[DTRACE_FUNCNAMELEN - 1] = '\0';
+		create->dtpd_name[DTRACE_NAMELEN - 1] = '\0';
+
+		mutex_enter(&dtrace_lock);
+		err = dtrace_enabling_replicate(state, match, create);
+		mutex_exit(&dtrace_lock);
+
+		return (err);
+	}
+
+	case DTRACEIOC_PROBEMATCH:
+	case DTRACEIOC_PROBES: {
+		dtrace_probe_t *probe = NULL;
+		dtrace_probedesc_t desc;
+		dtrace_probekey_t pkey;
+		dtrace_id_t i;
+		int m = 0;
+		uint32_t priv;
+		uid_t uid;
+		zoneid_t zoneid;
+
+		if (copyin((void *)arg, &desc, sizeof (desc)) != 0)
+			return (EFAULT);
+
+		desc.dtpd_provider[DTRACE_PROVNAMELEN - 1] = '\0';
+		desc.dtpd_mod[DTRACE_MODNAMELEN - 1] = '\0';
+		desc.dtpd_func[DTRACE_FUNCNAMELEN - 1] = '\0';
+		desc.dtpd_name[DTRACE_NAMELEN - 1] = '\0';
+
+		/*
+		 * Before we attempt to match this probe, we want to give
+		 * all providers the opportunity to provide it.
+		 */
+		if (desc.dtpd_id == DTRACE_IDNONE) {
+			mutex_enter(&dtrace_provider_lock);
+			dtrace_probe_provide(&desc, NULL);
+			mutex_exit(&dtrace_provider_lock);
+			desc.dtpd_id++;
+		}
+
+		if (cmd == DTRACEIOC_PROBEMATCH)  {
+			dtrace_probekey(&desc, &pkey);
+			pkey.dtpk_id = DTRACE_IDNONE;
+		}
+
+		dtrace_cred2priv(cr, &priv, &uid, &zoneid);
+
+		mutex_enter(&dtrace_lock);
+
+		if (cmd == DTRACEIOC_PROBEMATCH) {
+			for (i = desc.dtpd_id; i <= dtrace_nprobes; i++) {
+				if ((probe = dtrace_probes[i - 1]) != NULL &&
+				    (m = dtrace_match_probe(probe, &pkey,
+				    priv, uid, zoneid)) != 0)
+					break;
+			}
+
+			if (m < 0) {
+				mutex_exit(&dtrace_lock);
+				return (EINVAL);
+			}
+
+		} else {
+			for (i = desc.dtpd_id; i <= dtrace_nprobes; i++) {
+				if ((probe = dtrace_probes[i - 1]) != NULL &&
+				    dtrace_match_priv(probe, priv, uid, zoneid))
+					break;
+			}
+		}
+
+		if (probe == NULL) {
+			mutex_exit(&dtrace_lock);
+			return (ESRCH);
+		}
+
+		dtrace_probe_description(probe, &desc);
+		mutex_exit(&dtrace_lock);
+
+		if (copyout(&desc, (void *)arg, sizeof (desc)) != 0)
+			return (EFAULT);
+
+		return (0);
+	}
+
+	case DTRACEIOC_PROBEARG: {
+		dtrace_argdesc_t desc;
+		dtrace_probe_t *probe;
+		dtrace_provider_t *prov;
+
+		if (copyin((void *)arg, &desc, sizeof (desc)) != 0)
+			return (EFAULT);
+
+		if (desc.dtargd_id == DTRACE_IDNONE)
+			return (EINVAL);
+
+		if (desc.dtargd_ndx == DTRACE_ARGNONE)
+			return (EINVAL);
+
+		mutex_enter(&dtrace_provider_lock);
+		mutex_enter(&mod_lock);
+		mutex_enter(&dtrace_lock);
+
+		if (desc.dtargd_id > dtrace_nprobes) {
+			mutex_exit(&dtrace_lock);
+			mutex_exit(&mod_lock);
+			mutex_exit(&dtrace_provider_lock);
+			return (EINVAL);
+		}
+
+		if ((probe = dtrace_probes[desc.dtargd_id - 1]) == NULL) {
+			mutex_exit(&dtrace_lock);
+			mutex_exit(&mod_lock);
+			mutex_exit(&dtrace_provider_lock);
+			return (EINVAL);
+		}
+
+		mutex_exit(&dtrace_lock);
+
+		prov = probe->dtpr_provider;
+
+		if (prov->dtpv_pops.dtps_getargdesc == NULL) {
+			/*
+			 * There isn't any typed information for this probe.
+			 * Set the argument number to DTRACE_ARGNONE.
+			 */
+			desc.dtargd_ndx = DTRACE_ARGNONE;
+		} else {
+			desc.dtargd_native[0] = '\0';
+			desc.dtargd_xlate[0] = '\0';
+			desc.dtargd_mapping = desc.dtargd_ndx;
+
+			prov->dtpv_pops.dtps_getargdesc(prov->dtpv_arg,
+			    probe->dtpr_id, probe->dtpr_arg, &desc);
+		}
+
+		mutex_exit(&mod_lock);
+		mutex_exit(&dtrace_provider_lock);
+
+		if (copyout(&desc, (void *)arg, sizeof (desc)) != 0)
+			return (EFAULT);
+
+		return (0);
+	}
+
+	case DTRACEIOC_GO: {
+		processorid_t cpuid;
+		rval = dtrace_state_go(state, &cpuid);
+
+		if (rval != 0)
+			return (rval);
+
+		if (copyout(&cpuid, (void *)arg, sizeof (cpuid)) != 0)
+			return (EFAULT);
+
+		return (0);
+	}
+
+	case DTRACEIOC_STOP: {
+		processorid_t cpuid;
+
+		mutex_enter(&dtrace_lock);
+		rval = dtrace_state_stop(state, &cpuid);
+		mutex_exit(&dtrace_lock);
+
+		if (rval != 0)
+			return (rval);
+
+		if (copyout(&cpuid, (void *)arg, sizeof (cpuid)) != 0)
+			return (EFAULT);
+
+		return (0);
+	}
+
+	case DTRACEIOC_DOFGET: {
+		dof_hdr_t hdr, *dof;
+		uint64_t len;
+
+		if (copyin((void *)arg, &hdr, sizeof (hdr)) != 0)
+			return (EFAULT);
+
+		mutex_enter(&dtrace_lock);
+		dof = dtrace_dof_create(state);
+		mutex_exit(&dtrace_lock);
+
+		len = MIN(hdr.dofh_loadsz, dof->dofh_loadsz);
+		rval = copyout(dof, (void *)arg, len);
+		dtrace_dof_destroy(dof);
+
+		return (rval == 0 ? 0 : EFAULT);
+	}
+
+	case DTRACEIOC_AGGSNAP:
+	case DTRACEIOC_BUFSNAP: {
+		dtrace_bufdesc_t desc;
+		caddr_t cached;
+		dtrace_buffer_t *buf;
+
+		if (copyin((void *)arg, &desc, sizeof (desc)) != 0)
+			return (EFAULT);
+
+		if (desc.dtbd_cpu < 0 || desc.dtbd_cpu >= NCPU)
+			return (EINVAL);
+
+		mutex_enter(&dtrace_lock);
+
+		if (cmd == DTRACEIOC_BUFSNAP) {
+			buf = &state->dts_buffer[desc.dtbd_cpu];
+		} else {
+			buf = &state->dts_aggbuffer[desc.dtbd_cpu];
+		}
+
+		if (buf->dtb_flags & (DTRACEBUF_RING | DTRACEBUF_FILL)) {
+			size_t sz = buf->dtb_offset;
+
+			if (state->dts_activity != DTRACE_ACTIVITY_STOPPED) {
+				mutex_exit(&dtrace_lock);
+				return (EBUSY);
+			}
+
+			/*
+			 * If this buffer has already been consumed, we're
+			 * going to indicate that there's nothing left here
+			 * to consume.
+			 */
+			if (buf->dtb_flags & DTRACEBUF_CONSUMED) {
+				mutex_exit(&dtrace_lock);
+
+				desc.dtbd_size = 0;
+				desc.dtbd_drops = 0;
+				desc.dtbd_errors = 0;
+				desc.dtbd_oldest = 0;
+				sz = sizeof (desc);
+
+				if (copyout(&desc, (void *)arg, sz) != 0)
+					return (EFAULT);
+
+				return (0);
+			}
+
+			/*
+			 * If this is a ring buffer that has wrapped, we want
+			 * to copy the whole thing out.
+			 */
+			if (buf->dtb_flags & DTRACEBUF_WRAPPED) {
+				dtrace_buffer_polish(buf);
+				sz = buf->dtb_size;
+			}
+
+			if (copyout(buf->dtb_tomax, desc.dtbd_data, sz) != 0) {
+				mutex_exit(&dtrace_lock);
+				return (EFAULT);
+			}
+
+			desc.dtbd_size = sz;
+			desc.dtbd_drops = buf->dtb_drops;
+			desc.dtbd_errors = buf->dtb_errors;
+			desc.dtbd_oldest = buf->dtb_xamot_offset;
+
+			mutex_exit(&dtrace_lock);
+
+			if (copyout(&desc, (void *)arg, sizeof (desc)) != 0)
+				return (EFAULT);
+
+			buf->dtb_flags |= DTRACEBUF_CONSUMED;
+
+			return (0);
+		}
+
+		if (buf->dtb_tomax == NULL) {
+			ASSERT(buf->dtb_xamot == NULL);
+			mutex_exit(&dtrace_lock);
+			return (ENOENT);
+		}
+
+		cached = buf->dtb_tomax;
+		ASSERT(!(buf->dtb_flags & DTRACEBUF_NOSWITCH));
+
+		dtrace_xcall(desc.dtbd_cpu,
+		    (dtrace_xcall_t)dtrace_buffer_switch, buf);
+
+		state->dts_errors += buf->dtb_xamot_errors;
+
+		/*
+		 * If the buffers did not actually switch, then the cross call
+		 * did not take place -- presumably because the given CPU is
+		 * not in the ready set.  If this is the case, we'll return
+		 * ENOENT.
+		 */
+		if (buf->dtb_tomax == cached) {
+			ASSERT(buf->dtb_xamot != cached);
+			mutex_exit(&dtrace_lock);
+			return (ENOENT);
+		}
+
+		ASSERT(cached == buf->dtb_xamot);
+
+		/*
+		 * We have our snapshot; now copy it out.
+		 */
+		if (copyout(buf->dtb_xamot, desc.dtbd_data,
+		    buf->dtb_xamot_offset) != 0) {
+			mutex_exit(&dtrace_lock);
+			return (EFAULT);
+		}
+
+		desc.dtbd_size = buf->dtb_xamot_offset;
+		desc.dtbd_drops = buf->dtb_xamot_drops;
+		desc.dtbd_errors = buf->dtb_xamot_errors;
+		desc.dtbd_oldest = 0;
+
+		mutex_exit(&dtrace_lock);
+
+		/*
+		 * Finally, copy out the buffer description.
+		 */
+		if (copyout(&desc, (void *)arg, sizeof (desc)) != 0)
+			return (EFAULT);
+
+		return (0);
+	}
+
+	case DTRACEIOC_CONF: {
+		dtrace_conf_t conf;
+
+		bzero(&conf, sizeof (conf));
+		conf.dtc_difversion = DIF_VERSION;
+		conf.dtc_difintregs = DIF_DIR_NREGS;
+		conf.dtc_diftupregs = DIF_DTR_NREGS;
+		conf.dtc_ctfmodel = CTF_MODEL_NATIVE;
+
+		if (copyout(&conf, (void *)arg, sizeof (conf)) != 0)
+			return (EFAULT);
+
+		return (0);
+	}
+
+	case DTRACEIOC_STATUS: {
+		dtrace_status_t stat;
+		dtrace_dstate_t *dstate;
+		int i, j;
+		uint64_t nerrs;
+
+		/*
+		 * See the comment in dtrace_state_deadman() for the reason
+		 * for setting dts_laststatus to INT64_MAX before setting
+		 * it to the correct value.
+		 */
+		state->dts_laststatus = INT64_MAX;
+		dtrace_membar_producer();
+		state->dts_laststatus = dtrace_gethrtime();
+
+		bzero(&stat, sizeof (stat));
+
+		mutex_enter(&dtrace_lock);
+
+		if (state->dts_activity == DTRACE_ACTIVITY_INACTIVE) {
+			mutex_exit(&dtrace_lock);
+			return (ENOENT);
+		}
+
+		if (state->dts_activity == DTRACE_ACTIVITY_DRAINING)
+			stat.dtst_exiting = 1;
+
+		nerrs = state->dts_errors;
+		dstate = &state->dts_vstate.dtvs_dynvars;
+
+		for (i = 0; i < NCPU; i++) {
+			dtrace_dstate_percpu_t *dcpu = &dstate->dtds_percpu[i];
+
+			stat.dtst_dyndrops += dcpu->dtdsc_drops;
+			stat.dtst_dyndrops_dirty += dcpu->dtdsc_dirty_drops;
+			stat.dtst_dyndrops_rinsing += dcpu->dtdsc_rinsing_drops;
+
+			if (state->dts_buffer[i].dtb_flags & DTRACEBUF_FULL)
+				stat.dtst_filled++;
+
+			nerrs += state->dts_buffer[i].dtb_errors;
+
+			for (j = 0; j < state->dts_nspeculations; j++) {
+				dtrace_speculation_t *spec;
+				dtrace_buffer_t *buf;
+
+				spec = &state->dts_speculations[j];
+				buf = &spec->dtsp_buffer[i];
+				stat.dtst_specdrops += buf->dtb_xamot_drops;
+			}
+		}
+
+		stat.dtst_specdrops_busy = state->dts_speculations_busy;
+		stat.dtst_specdrops_unavail = state->dts_speculations_unavail;
+		stat.dtst_stkstroverflows = state->dts_stkstroverflows;
+		stat.dtst_dblerrors = state->dts_dblerrors;
+		stat.dtst_killed =
+		    (state->dts_activity == DTRACE_ACTIVITY_KILLED);
+		stat.dtst_errors = nerrs;
+
+		mutex_exit(&dtrace_lock);
+
+		if (copyout(&stat, (void *)arg, sizeof (stat)) != 0)
+			return (EFAULT);
+
+		return (0);
+	}
+
+	case DTRACEIOC_FORMAT: {
+		dtrace_fmtdesc_t fmt;
+		char *str;
+		int len;
+
+		if (copyin((void *)arg, &fmt, sizeof (fmt)) != 0)
+			return (EFAULT);
+
+		mutex_enter(&dtrace_lock);
+
+		if (fmt.dtfd_format == 0 ||
+		    fmt.dtfd_format > state->dts_nformats) {
+			mutex_exit(&dtrace_lock);
+			return (EINVAL);
+		}
+
+		/*
+		 * Format strings are allocated contiguously and they are
+		 * never freed; if a format index is less than the number
+		 * of formats, we can assert that the format map is non-NULL
+		 * and that the format for the specified index is non-NULL.
+		 */
+		ASSERT(state->dts_formats != NULL);
+		str = state->dts_formats[fmt.dtfd_format - 1];
+		ASSERT(str != NULL);
+
+		len = strlen(str) + 1;
+
+		if (len > fmt.dtfd_length) {
+			fmt.dtfd_length = len;
+
+			if (copyout(&fmt, (void *)arg, sizeof (fmt)) != 0) {
+				mutex_exit(&dtrace_lock);
+				return (EINVAL);
+			}
+		} else {
+			if (copyout(str, fmt.dtfd_string, len) != 0) {
+				mutex_exit(&dtrace_lock);
+				return (EINVAL);
+			}
+		}
+
+		mutex_exit(&dtrace_lock);
+		return (0);
+	}
+
+	default:
+		break;
+	}
+
+	return (ENOTTY);
+}
+
+/*ARGSUSED*/
+static int
+dtrace_detach(dev_info_t *dip, ddi_detach_cmd_t cmd)
+{
+	dtrace_state_t *state;
+
+	switch (cmd) {
+	case DDI_DETACH:
+		break;
+
+	case DDI_SUSPEND:
+		return (DDI_SUCCESS);
+
+	default:
+		return (DDI_FAILURE);
+	}
+
+	mutex_enter(&cpu_lock);
+	mutex_enter(&dtrace_provider_lock);
+	mutex_enter(&dtrace_lock);
+
+	ASSERT(dtrace_opens == 0);
+
+	if (dtrace_helpers > 0) {
+		mutex_exit(&dtrace_provider_lock);
+		mutex_exit(&dtrace_lock);
+		mutex_exit(&cpu_lock);
+		return (DDI_FAILURE);
+	}
+
+	if (dtrace_unregister((dtrace_provider_id_t)dtrace_provider) != 0) {
+		mutex_exit(&dtrace_provider_lock);
+		mutex_exit(&dtrace_lock);
+		mutex_exit(&cpu_lock);
+		return (DDI_FAILURE);
+	}
+
+	dtrace_provider = NULL;
+
+	if ((state = dtrace_anon_grab()) != NULL) {
+		/*
+		 * If there were ECBs on this state, the provider should
+		 * have not been allowed to detach; assert that there is
+		 * none.
+		 */
+		ASSERT(state->dts_necbs == 0);
+		dtrace_state_destroy(state);
+
+		/*
+		 * If we're being detached with anonymous state, we need to
+		 * indicate to the kernel debugger that DTrace is now inactive.
+		 */
+		(void) kdi_dtrace_set(KDI_DTSET_DTRACE_DEACTIVATE);
+	}
+
+	bzero(&dtrace_anon, sizeof (dtrace_anon_t));
+	unregister_cpu_setup_func((cpu_setup_func_t *)dtrace_cpu_setup, NULL);
+	dtrace_cpu_init = NULL;
+	dtrace_helpers_cleanup = NULL;
+	dtrace_helpers_fork = NULL;
+	dtrace_cpustart_init = NULL;
+	dtrace_cpustart_fini = NULL;
+	dtrace_debugger_init = NULL;
+	dtrace_debugger_fini = NULL;
+	dtrace_modload = NULL;
+	dtrace_modunload = NULL;
+
+	mutex_exit(&cpu_lock);
+
+	if (dtrace_helptrace_enabled) {
+		kmem_free(dtrace_helptrace_buffer, dtrace_helptrace_bufsize);
+		dtrace_helptrace_buffer = NULL;
+	}
+
+	kmem_free(dtrace_probes, dtrace_nprobes * sizeof (dtrace_probe_t *));
+	dtrace_probes = NULL;
+	dtrace_nprobes = 0;
+
+	dtrace_hash_destroy(dtrace_bymod);
+	dtrace_hash_destroy(dtrace_byfunc);
+	dtrace_hash_destroy(dtrace_byname);
+	dtrace_bymod = NULL;
+	dtrace_byfunc = NULL;
+	dtrace_byname = NULL;
+
+	kmem_cache_destroy(dtrace_state_cache);
+	vmem_destroy(dtrace_minor);
+	vmem_destroy(dtrace_arena);
+
+	if (dtrace_toxrange != NULL) {
+		kmem_free(dtrace_toxrange,
+		    dtrace_toxranges_max * sizeof (dtrace_toxrange_t));
+		dtrace_toxrange = NULL;
+		dtrace_toxranges = 0;
+		dtrace_toxranges_max = 0;
+	}
+
+	ddi_remove_minor_node(dtrace_devi, NULL);
+	dtrace_devi = NULL;
+
+	ddi_soft_state_fini(&dtrace_softstate);
+
+	ASSERT(dtrace_vtime_references == 0);
+	ASSERT(dtrace_opens == 0);
+	ASSERT(dtrace_retained == NULL);
+
+	mutex_exit(&dtrace_lock);
+	mutex_exit(&dtrace_provider_lock);
+
+	/*
+	 * We don't destroy the task queue until after we have dropped our
+	 * locks (taskq_destroy() may block on running tasks).  To prevent
+	 * attempting to do work after we have effectively detached but before
+	 * the task queue has been destroyed, all tasks dispatched via the
+	 * task queue must check that DTrace is still attached before
+	 * performing any operation.
+	 */
+	taskq_destroy(dtrace_taskq);
+	dtrace_taskq = NULL;
+
+	return (DDI_SUCCESS);
+}
+
+/*ARGSUSED*/
+static int
+dtrace_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
+{
+	int error;
+
+	switch (infocmd) {
+	case DDI_INFO_DEVT2DEVINFO:
+		*result = (void *)dtrace_devi;
+		error = DDI_SUCCESS;
+		break;
+	case DDI_INFO_DEVT2INSTANCE:
+		*result = (void *)0;
+		error = DDI_SUCCESS;
+		break;
+	default:
+		error = DDI_FAILURE;
+	}
+	return (error);
+}
+
+static struct cb_ops dtrace_cb_ops = {
+	dtrace_open,		/* open */
+	dtrace_close,		/* close */
+	nulldev,		/* strategy */
+	nulldev,		/* print */
+	nodev,			/* dump */
+	nodev,			/* read */
+	nodev,			/* write */
+	dtrace_ioctl,		/* ioctl */
+	nodev,			/* devmap */
+	nodev,			/* mmap */
+	nodev,			/* segmap */
+	nochpoll,		/* poll */
+	ddi_prop_op,		/* cb_prop_op */
+	0,			/* streamtab  */
+	D_NEW | D_MP		/* Driver compatibility flag */
+};
+
+static struct dev_ops dtrace_ops = {
+	DEVO_REV,		/* devo_rev */
+	0,			/* refcnt */
+	dtrace_info,		/* get_dev_info */
+	nulldev,		/* identify */
+	nulldev,		/* probe */
+	dtrace_attach,		/* attach */
+	dtrace_detach,		/* detach */
+	nodev,			/* reset */
+	&dtrace_cb_ops,		/* driver operations */
+	NULL,			/* bus operations */
+	nodev			/* dev power */
+};
+
+static struct modldrv modldrv = {
+	&mod_driverops,		/* module type (this is a pseudo driver) */
+	"Dynamic Tracing",	/* name of module */
+	&dtrace_ops,		/* driver ops */
+};
+
+static struct modlinkage modlinkage = {
+	MODREV_1,
+	(void *)&modldrv,
+	NULL
+};
+
+int
+_init(void)
+{
+	return (mod_install(&modlinkage));
+}
+
+int
+_info(struct modinfo *modinfop)
+{
+	return (mod_info(&modlinkage, modinfop));
+}
+
+int
+_fini(void)
+{
+	return (mod_remove(&modlinkage));
+}
diff --git a/cddl/contrib/opensolaris/uts/common/dtrace/fasttrap.c b/cddl/contrib/opensolaris/uts/common/dtrace/fasttrap.c
new file mode 100644
index 0000000..dd78b48
--- /dev/null
+++ b/cddl/contrib/opensolaris/uts/common/dtrace/fasttrap.c
@@ -0,0 +1,2346 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <sys/atomic.h>
+#include <sys/errno.h>
+#include <sys/stat.h>
+#include <sys/modctl.h>
+#include <sys/conf.h>
+#include <sys/systm.h>
+#include <sys/ddi.h>
+#include <sys/sunddi.h>
+#include <sys/cpuvar.h>
+#include <sys/kmem.h>
+#include <sys/strsubr.h>
+#include <sys/fasttrap.h>
+#include <sys/fasttrap_impl.h>
+#include <sys/fasttrap_isa.h>
+#include <sys/dtrace.h>
+#include <sys/dtrace_impl.h>
+#include <sys/sysmacros.h>
+#include <sys/proc.h>
+#include <sys/priv.h>
+#include <sys/policy.h>
+#include <util/qsort.h>
+
+/*
+ * User-Land Trap-Based Tracing
+ * ----------------------------
+ *
+ * The fasttrap provider allows DTrace consumers to instrument any user-level
+ * instruction to gather data; this includes probes with semantic
+ * signifigance like entry and return as well as simple offsets into the
+ * function. While the specific techniques used are very ISA specific, the
+ * methodology is generalizable to any architecture.
+ *
+ *
+ * The General Methodology
+ * -----------------------
+ *
+ * With the primary goal of tracing every user-land instruction and the
+ * limitation that we can't trust user space so don't want to rely on much
+ * information there, we begin by replacing the instructions we want to trace
+ * with trap instructions. Each instruction we overwrite is saved into a hash
+ * table keyed by process ID and pc address. When we enter the kernel due to
+ * this trap instruction, we need the effects of the replaced instruction to
+ * appear to have occurred before we proceed with the user thread's
+ * execution.
+ *
+ * Each user level thread is represented by a ulwp_t structure which is
+ * always easily accessible through a register. The most basic way to produce
+ * the effects of the instruction we replaced is to copy that instruction out
+ * to a bit of scratch space reserved in the user thread's ulwp_t structure
+ * (a sort of kernel-private thread local storage), set the PC to that
+ * scratch space and single step. When we reenter the kernel after single
+ * stepping the instruction we must then adjust the PC to point to what would
+ * normally be the next instruction. Of course, special care must be taken
+ * for branches and jumps, but these represent such a small fraction of any
+ * instruction set that writing the code to emulate these in the kernel is
+ * not too difficult.
+ *
+ * Return probes may require several tracepoints to trace every return site,
+ * and, conversely, each tracepoint may activate several probes (the entry
+ * and offset 0 probes, for example). To solve this muliplexing problem,
+ * tracepoints contain lists of probes to activate and probes contain lists
+ * of tracepoints to enable. If a probe is activated, it adds its ID to
+ * existing tracepoints or creates new ones as necessary.
+ *
+ * Most probes are activated _before_ the instruction is executed, but return
+ * probes are activated _after_ the effects of the last instruction of the
+ * function are visible. Return probes must be fired _after_ we have
+ * single-stepped the instruction whereas all other probes are fired
+ * beforehand.
+ *
+ *
+ * Lock Ordering
+ * -------------
+ *
+ * The lock ordering below -- both internally and with respect to the DTrace
+ * framework -- is a little tricky and bears some explanation. Each provider
+ * has a lock (ftp_mtx) that protects its members including reference counts
+ * for enabled probes (ftp_rcount), consumers actively creating probes
+ * (ftp_ccount) and USDT consumers (ftp_mcount); all three prevent a provider
+ * from being freed. A provider is looked up by taking the bucket lock for the
+ * provider hash table, and is returned with its lock held. The provider lock
+ * may be taken in functions invoked by the DTrace framework, but may not be
+ * held while calling functions in the DTrace framework.
+ *
+ * To ensure consistency over multiple calls to the DTrace framework, the
+ * creation lock (ftp_cmtx) should be held. Naturally, the creation lock may
+ * not be taken when holding the provider lock as that would create a cyclic
+ * lock ordering. In situations where one would naturally take the provider
+ * lock and then the creation lock, we instead up a reference count to prevent
+ * the provider from disappearing, drop the provider lock, and acquire the
+ * creation lock.
+ *
+ * Briefly:
+ * 	bucket lock before provider lock
+ *	DTrace before provider lock
+ *	creation lock before DTrace
+ *	never hold the provider lock and creation lock simultaneously
+ */
+
+static dev_info_t *fasttrap_devi;
+static dtrace_meta_provider_id_t fasttrap_meta_id;
+
+static timeout_id_t fasttrap_timeout;
+static kmutex_t fasttrap_cleanup_mtx;
+static uint_t fasttrap_cleanup_work;
+
+/*
+ * Generation count on modifications to the global tracepoint lookup table.
+ */
+static volatile uint64_t fasttrap_mod_gen;
+
+/*
+ * When the fasttrap provider is loaded, fasttrap_max is set to either
+ * FASTTRAP_MAX_DEFAULT or the value for fasttrap-max-probes in the
+ * fasttrap.conf file. Each time a probe is created, fasttrap_total is
+ * incremented by the number of tracepoints that may be associated with that
+ * probe; fasttrap_total is capped at fasttrap_max.
+ */
+#define	FASTTRAP_MAX_DEFAULT		250000
+static uint32_t fasttrap_max;
+static uint32_t fasttrap_total;
+
+
+#define	FASTTRAP_TPOINTS_DEFAULT_SIZE	0x4000
+#define	FASTTRAP_PROVIDERS_DEFAULT_SIZE	0x100
+#define	FASTTRAP_PROCS_DEFAULT_SIZE	0x100
+
+#define	FASTTRAP_PID_NAME		"pid"
+
+fasttrap_hash_t			fasttrap_tpoints;
+static fasttrap_hash_t		fasttrap_provs;
+static fasttrap_hash_t		fasttrap_procs;
+
+static uint64_t			fasttrap_pid_count;	/* pid ref count */
+static kmutex_t			fasttrap_count_mtx;	/* lock on ref count */
+
+#define	FASTTRAP_ENABLE_FAIL	1
+#define	FASTTRAP_ENABLE_PARTIAL	2
+
+static int fasttrap_tracepoint_enable(proc_t *, fasttrap_probe_t *, uint_t);
+static void fasttrap_tracepoint_disable(proc_t *, fasttrap_probe_t *, uint_t);
+
+static fasttrap_provider_t *fasttrap_provider_lookup(pid_t, const char *,
+    const dtrace_pattr_t *);
+static void fasttrap_provider_retire(pid_t, const char *, int);
+static void fasttrap_provider_free(fasttrap_provider_t *);
+
+static fasttrap_proc_t *fasttrap_proc_lookup(pid_t);
+static void fasttrap_proc_release(fasttrap_proc_t *);
+
+#define	FASTTRAP_PROVS_INDEX(pid, name) \
+	((fasttrap_hash_str(name) + (pid)) & fasttrap_provs.fth_mask)
+
+#define	FASTTRAP_PROCS_INDEX(pid) ((pid) & fasttrap_procs.fth_mask)
+
+static int
+fasttrap_highbit(ulong_t i)
+{
+	int h = 1;
+
+	if (i == 0)
+		return (0);
+#ifdef _LP64
+	if (i & 0xffffffff00000000ul) {
+		h += 32; i >>= 32;
+	}
+#endif
+	if (i & 0xffff0000) {
+		h += 16; i >>= 16;
+	}
+	if (i & 0xff00) {
+		h += 8; i >>= 8;
+	}
+	if (i & 0xf0) {
+		h += 4; i >>= 4;
+	}
+	if (i & 0xc) {
+		h += 2; i >>= 2;
+	}
+	if (i & 0x2) {
+		h += 1;
+	}
+	return (h);
+}
+
+static uint_t
+fasttrap_hash_str(const char *p)
+{
+	unsigned int g;
+	uint_t hval = 0;
+
+	while (*p) {
+		hval = (hval << 4) + *p++;
+		if ((g = (hval & 0xf0000000)) != 0)
+			hval ^= g >> 24;
+		hval &= ~g;
+	}
+	return (hval);
+}
+
+void
+fasttrap_sigtrap(proc_t *p, kthread_t *t, uintptr_t pc)
+{
+	sigqueue_t *sqp = kmem_zalloc(sizeof (sigqueue_t), KM_SLEEP);
+
+	sqp->sq_info.si_signo = SIGTRAP;
+	sqp->sq_info.si_code = TRAP_DTRACE;
+	sqp->sq_info.si_addr = (caddr_t)pc;
+
+	mutex_enter(&p->p_lock);
+	sigaddqa(p, t, sqp);
+	mutex_exit(&p->p_lock);
+
+	if (t != NULL)
+		aston(t);
+}
+
+/*
+ * This function ensures that no threads are actively using the memory
+ * associated with probes that were formerly live.
+ */
+static void
+fasttrap_mod_barrier(uint64_t gen)
+{
+	int i;
+
+	if (gen < fasttrap_mod_gen)
+		return;
+
+	fasttrap_mod_gen++;
+
+	for (i = 0; i < NCPU; i++) {
+		mutex_enter(&cpu_core[i].cpuc_pid_lock);
+		mutex_exit(&cpu_core[i].cpuc_pid_lock);
+	}
+}
+
+/*
+ * This is the timeout's callback for cleaning up the providers and their
+ * probes.
+ */
+/*ARGSUSED*/
+static void
+fasttrap_pid_cleanup_cb(void *data)
+{
+	fasttrap_provider_t **fpp, *fp;
+	fasttrap_bucket_t *bucket;
+	dtrace_provider_id_t provid;
+	int i, later;
+
+	static volatile int in = 0;
+	ASSERT(in == 0);
+	in = 1;
+
+	mutex_enter(&fasttrap_cleanup_mtx);
+	while (fasttrap_cleanup_work) {
+		fasttrap_cleanup_work = 0;
+		mutex_exit(&fasttrap_cleanup_mtx);
+
+		later = 0;
+
+		/*
+		 * Iterate over all the providers trying to remove the marked
+		 * ones. If a provider is marked but not retired, we just
+		 * have to take a crack at removing it -- it's no big deal if
+		 * we can't.
+		 */
+		for (i = 0; i < fasttrap_provs.fth_nent; i++) {
+			bucket = &fasttrap_provs.fth_table[i];
+			mutex_enter(&bucket->ftb_mtx);
+			fpp = (fasttrap_provider_t **)&bucket->ftb_data;
+
+			while ((fp = *fpp) != NULL) {
+				if (!fp->ftp_marked) {
+					fpp = &fp->ftp_next;
+					continue;
+				}
+
+				mutex_enter(&fp->ftp_mtx);
+
+				/*
+				 * If this provider has consumers actively
+				 * creating probes (ftp_ccount) or is a USDT
+				 * provider (ftp_mcount), we can't unregister
+				 * or even condense.
+				 */
+				if (fp->ftp_ccount != 0 ||
+				    fp->ftp_mcount != 0) {
+					mutex_exit(&fp->ftp_mtx);
+					fp->ftp_marked = 0;
+					continue;
+				}
+
+				if (!fp->ftp_retired || fp->ftp_rcount != 0)
+					fp->ftp_marked = 0;
+
+				mutex_exit(&fp->ftp_mtx);
+
+				/*
+				 * If we successfully unregister this
+				 * provider we can remove it from the hash
+				 * chain and free the memory. If our attempt
+				 * to unregister fails and this is a retired
+				 * provider, increment our flag to try again
+				 * pretty soon. If we've consumed more than
+				 * half of our total permitted number of
+				 * probes call dtrace_condense() to try to
+				 * clean out the unenabled probes.
+				 */
+				provid = fp->ftp_provid;
+				if (dtrace_unregister(provid) != 0) {
+					if (fasttrap_total > fasttrap_max / 2)
+						(void) dtrace_condense(provid);
+					later += fp->ftp_marked;
+					fpp = &fp->ftp_next;
+				} else {
+					*fpp = fp->ftp_next;
+					fasttrap_provider_free(fp);
+				}
+			}
+			mutex_exit(&bucket->ftb_mtx);
+		}
+
+		mutex_enter(&fasttrap_cleanup_mtx);
+	}
+
+	ASSERT(fasttrap_timeout != 0);
+
+	/*
+	 * If we were unable to remove a retired provider, try again after
+	 * a second. This situation can occur in certain circumstances where
+	 * providers cannot be unregistered even though they have no probes
+	 * enabled because of an execution of dtrace -l or something similar.
+	 * If the timeout has been disabled (set to 1 because we're trying
+	 * to detach), we set fasttrap_cleanup_work to ensure that we'll
+	 * get a chance to do that work if and when the timeout is reenabled
+	 * (if detach fails).
+	 */
+	if (later > 0 && fasttrap_timeout != (timeout_id_t)1)
+		fasttrap_timeout = timeout(&fasttrap_pid_cleanup_cb, NULL, hz);
+	else if (later > 0)
+		fasttrap_cleanup_work = 1;
+	else
+		fasttrap_timeout = 0;
+
+	mutex_exit(&fasttrap_cleanup_mtx);
+	in = 0;
+}
+
+/*
+ * Activates the asynchronous cleanup mechanism.
+ */
+static void
+fasttrap_pid_cleanup(void)
+{
+	mutex_enter(&fasttrap_cleanup_mtx);
+	fasttrap_cleanup_work = 1;
+	if (fasttrap_timeout == 0)
+		fasttrap_timeout = timeout(&fasttrap_pid_cleanup_cb, NULL, 1);
+	mutex_exit(&fasttrap_cleanup_mtx);
+}
+
+/*
+ * This is called from cfork() via dtrace_fasttrap_fork(). The child
+ * process's address space is a (roughly) a copy of the parent process's so
+ * we have to remove all the instrumentation we had previously enabled in the
+ * parent.
+ */
+static void
+fasttrap_fork(proc_t *p, proc_t *cp)
+{
+	pid_t ppid = p->p_pid;
+	int i;
+
+	ASSERT(curproc == p);
+	ASSERT(p->p_proc_flag & P_PR_LOCK);
+	ASSERT(p->p_dtrace_count > 0);
+	ASSERT(cp->p_dtrace_count == 0);
+
+	/*
+	 * This would be simpler and faster if we maintained per-process
+	 * hash tables of enabled tracepoints. It could, however, potentially
+	 * slow down execution of a tracepoint since we'd need to go
+	 * through two levels of indirection. In the future, we should
+	 * consider either maintaining per-process ancillary lists of
+	 * enabled tracepoints or hanging a pointer to a per-process hash
+	 * table of enabled tracepoints off the proc structure.
+	 */
+
+	/*
+	 * We don't have to worry about the child process disappearing
+	 * because we're in fork().
+	 */
+	mutex_enter(&cp->p_lock);
+	sprlock_proc(cp);
+	mutex_exit(&cp->p_lock);
+
+	/*
+	 * Iterate over every tracepoint looking for ones that belong to the
+	 * parent process, and remove each from the child process.
+	 */
+	for (i = 0; i < fasttrap_tpoints.fth_nent; i++) {
+		fasttrap_tracepoint_t *tp;
+		fasttrap_bucket_t *bucket = &fasttrap_tpoints.fth_table[i];
+
+		mutex_enter(&bucket->ftb_mtx);
+		for (tp = bucket->ftb_data; tp != NULL; tp = tp->ftt_next) {
+			if (tp->ftt_pid == ppid &&
+			    tp->ftt_proc->ftpc_acount != 0) {
+				int ret = fasttrap_tracepoint_remove(cp, tp);
+				ASSERT(ret == 0);
+			}
+		}
+		mutex_exit(&bucket->ftb_mtx);
+	}
+
+	mutex_enter(&cp->p_lock);
+	sprunlock(cp);
+}
+
+/*
+ * This is called from proc_exit() or from exec_common() if p_dtrace_probes
+ * is set on the proc structure to indicate that there is a pid provider
+ * associated with this process.
+ */
+static void
+fasttrap_exec_exit(proc_t *p)
+{
+	ASSERT(p == curproc);
+	ASSERT(MUTEX_HELD(&p->p_lock));
+
+	mutex_exit(&p->p_lock);
+
+	/*
+	 * We clean up the pid provider for this process here; user-land
+	 * static probes are handled by the meta-provider remove entry point.
+	 */
+	fasttrap_provider_retire(p->p_pid, FASTTRAP_PID_NAME, 0);
+
+	mutex_enter(&p->p_lock);
+}
+
+
+/*ARGSUSED*/
+static void
+fasttrap_pid_provide(void *arg, const dtrace_probedesc_t *desc)
+{
+	/*
+	 * There are no "default" pid probes.
+	 */
+}
+
+static int
+fasttrap_tracepoint_enable(proc_t *p, fasttrap_probe_t *probe, uint_t index)
+{
+	fasttrap_tracepoint_t *tp, *new_tp = NULL;
+	fasttrap_bucket_t *bucket;
+	fasttrap_id_t *id;
+	pid_t pid;
+	uintptr_t pc;
+
+	ASSERT(index < probe->ftp_ntps);
+
+	pid = probe->ftp_pid;
+	pc = probe->ftp_tps[index].fit_tp->ftt_pc;
+	id = &probe->ftp_tps[index].fit_id;
+
+	ASSERT(probe->ftp_tps[index].fit_tp->ftt_pid == pid);
+
+	ASSERT(!(p->p_flag & SVFORK));
+
+	/*
+	 * Before we make any modifications, make sure we've imposed a barrier
+	 * on the generation in which this probe was last modified.
+	 */
+	fasttrap_mod_barrier(probe->ftp_gen);
+
+	bucket = &fasttrap_tpoints.fth_table[FASTTRAP_TPOINTS_INDEX(pid, pc)];
+
+	/*
+	 * If the tracepoint has already been enabled, just add our id to the
+	 * list of interested probes. This may be our second time through
+	 * this path in which case we'll have constructed the tracepoint we'd
+	 * like to install. If we can't find a match, and have an allocated
+	 * tracepoint ready to go, enable that one now.
+	 *
+	 * A tracepoint whose process is defunct is also considered defunct.
+	 */
+again:
+	mutex_enter(&bucket->ftb_mtx);
+	for (tp = bucket->ftb_data; tp != NULL; tp = tp->ftt_next) {
+		if (tp->ftt_pid != pid || tp->ftt_pc != pc ||
+		    tp->ftt_proc->ftpc_acount == 0)
+			continue;
+
+		/*
+		 * Now that we've found a matching tracepoint, it would be
+		 * a decent idea to confirm that the tracepoint is still
+		 * enabled and the trap instruction hasn't been overwritten.
+		 * Since this is a little hairy, we'll punt for now.
+		 */
+
+		/*
+		 * This can't be the first interested probe. We don't have
+		 * to worry about another thread being in the midst of
+		 * deleting this tracepoint (which would be the only valid
+		 * reason for a tracepoint to have no interested probes)
+		 * since we're holding P_PR_LOCK for this process.
+		 */
+		ASSERT(tp->ftt_ids != NULL || tp->ftt_retids != NULL);
+
+		switch (id->fti_ptype) {
+		case DTFTP_ENTRY:
+		case DTFTP_OFFSETS:
+		case DTFTP_IS_ENABLED:
+			id->fti_next = tp->ftt_ids;
+			membar_producer();
+			tp->ftt_ids = id;
+			membar_producer();
+			break;
+
+		case DTFTP_RETURN:
+		case DTFTP_POST_OFFSETS:
+			id->fti_next = tp->ftt_retids;
+			membar_producer();
+			tp->ftt_retids = id;
+			membar_producer();
+			break;
+
+		default:
+			ASSERT(0);
+		}
+
+		mutex_exit(&bucket->ftb_mtx);
+
+		if (new_tp != NULL) {
+			new_tp->ftt_ids = NULL;
+			new_tp->ftt_retids = NULL;
+		}
+
+		return (0);
+	}
+
+	/*
+	 * If we have a good tracepoint ready to go, install it now while
+	 * we have the lock held and no one can screw with us.
+	 */
+	if (new_tp != NULL) {
+		int rc = 0;
+
+		new_tp->ftt_next = bucket->ftb_data;
+		membar_producer();
+		bucket->ftb_data = new_tp;
+		membar_producer();
+		mutex_exit(&bucket->ftb_mtx);
+
+		/*
+		 * Activate the tracepoint in the ISA-specific manner.
+		 * If this fails, we need to report the failure, but
+		 * indicate that this tracepoint must still be disabled
+		 * by calling fasttrap_tracepoint_disable().
+		 */
+		if (fasttrap_tracepoint_install(p, new_tp) != 0)
+			rc = FASTTRAP_ENABLE_PARTIAL;
+
+		/*
+		 * Increment the count of the number of tracepoints active in
+		 * the victim process.
+		 */
+		ASSERT(p->p_proc_flag & P_PR_LOCK);
+		p->p_dtrace_count++;
+
+		return (rc);
+	}
+
+	mutex_exit(&bucket->ftb_mtx);
+
+	/*
+	 * Initialize the tracepoint that's been preallocated with the probe.
+	 */
+	new_tp = probe->ftp_tps[index].fit_tp;
+
+	ASSERT(new_tp->ftt_pid == pid);
+	ASSERT(new_tp->ftt_pc == pc);
+	ASSERT(new_tp->ftt_proc == probe->ftp_prov->ftp_proc);
+	ASSERT(new_tp->ftt_ids == NULL);
+	ASSERT(new_tp->ftt_retids == NULL);
+
+	switch (id->fti_ptype) {
+	case DTFTP_ENTRY:
+	case DTFTP_OFFSETS:
+	case DTFTP_IS_ENABLED:
+		id->fti_next = NULL;
+		new_tp->ftt_ids = id;
+		break;
+
+	case DTFTP_RETURN:
+	case DTFTP_POST_OFFSETS:
+		id->fti_next = NULL;
+		new_tp->ftt_retids = id;
+		break;
+
+	default:
+		ASSERT(0);
+	}
+
+	/*
+	 * If the ISA-dependent initialization goes to plan, go back to the
+	 * beginning and try to install this freshly made tracepoint.
+	 */
+	if (fasttrap_tracepoint_init(p, new_tp, pc, id->fti_ptype) == 0)
+		goto again;
+
+	new_tp->ftt_ids = NULL;
+	new_tp->ftt_retids = NULL;
+
+	return (FASTTRAP_ENABLE_FAIL);
+}
+
+static void
+fasttrap_tracepoint_disable(proc_t *p, fasttrap_probe_t *probe, uint_t index)
+{
+	fasttrap_bucket_t *bucket;
+	fasttrap_provider_t *provider = probe->ftp_prov;
+	fasttrap_tracepoint_t **pp, *tp;
+	fasttrap_id_t *id, **idp;
+	pid_t pid;
+	uintptr_t pc;
+
+	ASSERT(index < probe->ftp_ntps);
+
+	pid = probe->ftp_pid;
+	pc = probe->ftp_tps[index].fit_tp->ftt_pc;
+	id = &probe->ftp_tps[index].fit_id;
+
+	ASSERT(probe->ftp_tps[index].fit_tp->ftt_pid == pid);
+
+	/*
+	 * Find the tracepoint and make sure that our id is one of the
+	 * ones registered with it.
+	 */
+	bucket = &fasttrap_tpoints.fth_table[FASTTRAP_TPOINTS_INDEX(pid, pc)];
+	mutex_enter(&bucket->ftb_mtx);
+	for (tp = bucket->ftb_data; tp != NULL; tp = tp->ftt_next) {
+		if (tp->ftt_pid == pid && tp->ftt_pc == pc &&
+		    tp->ftt_proc == provider->ftp_proc)
+			break;
+	}
+
+	/*
+	 * If we somehow lost this tracepoint, we're in a world of hurt.
+	 */
+	ASSERT(tp != NULL);
+
+	switch (id->fti_ptype) {
+	case DTFTP_ENTRY:
+	case DTFTP_OFFSETS:
+	case DTFTP_IS_ENABLED:
+		ASSERT(tp->ftt_ids != NULL);
+		idp = &tp->ftt_ids;
+		break;
+
+	case DTFTP_RETURN:
+	case DTFTP_POST_OFFSETS:
+		ASSERT(tp->ftt_retids != NULL);
+		idp = &tp->ftt_retids;
+		break;
+
+	default:
+		ASSERT(0);
+	}
+
+	while ((*idp)->fti_probe != probe) {
+		idp = &(*idp)->fti_next;
+		ASSERT(*idp != NULL);
+	}
+
+	id = *idp;
+	*idp = id->fti_next;
+	membar_producer();
+
+	ASSERT(id->fti_probe == probe);
+
+	/*
+	 * If there are other registered enablings of this tracepoint, we're
+	 * all done, but if this was the last probe assocated with this
+	 * this tracepoint, we need to remove and free it.
+	 */
+	if (tp->ftt_ids != NULL || tp->ftt_retids != NULL) {
+
+		/*
+		 * If the current probe's tracepoint is in use, swap it
+		 * for an unused tracepoint.
+		 */
+		if (tp == probe->ftp_tps[index].fit_tp) {
+			fasttrap_probe_t *tmp_probe;
+			fasttrap_tracepoint_t **tmp_tp;
+			uint_t tmp_index;
+
+			if (tp->ftt_ids != NULL) {
+				tmp_probe = tp->ftt_ids->fti_probe;
+				/* LINTED - alignment */
+				tmp_index = FASTTRAP_ID_INDEX(tp->ftt_ids);
+				tmp_tp = &tmp_probe->ftp_tps[tmp_index].fit_tp;
+			} else {
+				tmp_probe = tp->ftt_retids->fti_probe;
+				/* LINTED - alignment */
+				tmp_index = FASTTRAP_ID_INDEX(tp->ftt_retids);
+				tmp_tp = &tmp_probe->ftp_tps[tmp_index].fit_tp;
+			}
+
+			ASSERT(*tmp_tp != NULL);
+			ASSERT(*tmp_tp != probe->ftp_tps[index].fit_tp);
+			ASSERT((*tmp_tp)->ftt_ids == NULL);
+			ASSERT((*tmp_tp)->ftt_retids == NULL);
+
+			probe->ftp_tps[index].fit_tp = *tmp_tp;
+			*tmp_tp = tp;
+		}
+
+		mutex_exit(&bucket->ftb_mtx);
+
+		/*
+		 * Tag the modified probe with the generation in which it was
+		 * changed.
+		 */
+		probe->ftp_gen = fasttrap_mod_gen;
+		return;
+	}
+
+	mutex_exit(&bucket->ftb_mtx);
+
+	/*
+	 * We can't safely remove the tracepoint from the set of active
+	 * tracepoints until we've actually removed the fasttrap instruction
+	 * from the process's text. We can, however, operate on this
+	 * tracepoint secure in the knowledge that no other thread is going to
+	 * be looking at it since we hold P_PR_LOCK on the process if it's
+	 * live or we hold the provider lock on the process if it's dead and
+	 * gone.
+	 */
+
+	/*
+	 * We only need to remove the actual instruction if we're looking
+	 * at an existing process
+	 */
+	if (p != NULL) {
+		/*
+		 * If we fail to restore the instruction we need to kill
+		 * this process since it's in a completely unrecoverable
+		 * state.
+		 */
+		if (fasttrap_tracepoint_remove(p, tp) != 0)
+			fasttrap_sigtrap(p, NULL, pc);
+
+		/*
+		 * Decrement the count of the number of tracepoints active
+		 * in the victim process.
+		 */
+		ASSERT(p->p_proc_flag & P_PR_LOCK);
+		p->p_dtrace_count--;
+	}
+
+	/*
+	 * Remove the probe from the hash table of active tracepoints.
+	 */
+	mutex_enter(&bucket->ftb_mtx);
+	pp = (fasttrap_tracepoint_t **)&bucket->ftb_data;
+	ASSERT(*pp != NULL);
+	while (*pp != tp) {
+		pp = &(*pp)->ftt_next;
+		ASSERT(*pp != NULL);
+	}
+
+	*pp = tp->ftt_next;
+	membar_producer();
+
+	mutex_exit(&bucket->ftb_mtx);
+
+	/*
+	 * Tag the modified probe with the generation in which it was changed.
+	 */
+	probe->ftp_gen = fasttrap_mod_gen;
+}
+
+static void
+fasttrap_enable_callbacks(void)
+{
+	/*
+	 * We don't have to play the rw lock game here because we're
+	 * providing something rather than taking something away --
+	 * we can be sure that no threads have tried to follow this
+	 * function pointer yet.
+	 */
+	mutex_enter(&fasttrap_count_mtx);
+	if (fasttrap_pid_count == 0) {
+		ASSERT(dtrace_pid_probe_ptr == NULL);
+		ASSERT(dtrace_return_probe_ptr == NULL);
+		dtrace_pid_probe_ptr = &fasttrap_pid_probe;
+		dtrace_return_probe_ptr = &fasttrap_return_probe;
+	}
+	ASSERT(dtrace_pid_probe_ptr == &fasttrap_pid_probe);
+	ASSERT(dtrace_return_probe_ptr == &fasttrap_return_probe);
+	fasttrap_pid_count++;
+	mutex_exit(&fasttrap_count_mtx);
+}
+
+static void
+fasttrap_disable_callbacks(void)
+{
+	ASSERT(MUTEX_HELD(&cpu_lock));
+
+	mutex_enter(&fasttrap_count_mtx);
+	ASSERT(fasttrap_pid_count > 0);
+	fasttrap_pid_count--;
+	if (fasttrap_pid_count == 0) {
+		cpu_t *cur, *cpu = CPU;
+
+		for (cur = cpu->cpu_next_onln; cur != cpu;
+		    cur = cur->cpu_next_onln) {
+			rw_enter(&cur->cpu_ft_lock, RW_WRITER);
+		}
+
+		dtrace_pid_probe_ptr = NULL;
+		dtrace_return_probe_ptr = NULL;
+
+		for (cur = cpu->cpu_next_onln; cur != cpu;
+		    cur = cur->cpu_next_onln) {
+			rw_exit(&cur->cpu_ft_lock);
+		}
+	}
+	mutex_exit(&fasttrap_count_mtx);
+}
+
+/*ARGSUSED*/
+static void
+fasttrap_pid_enable(void *arg, dtrace_id_t id, void *parg)
+{
+	fasttrap_probe_t *probe = parg;
+	proc_t *p;
+	int i, rc;
+
+	ASSERT(probe != NULL);
+	ASSERT(!probe->ftp_enabled);
+	ASSERT(id == probe->ftp_id);
+	ASSERT(MUTEX_HELD(&cpu_lock));
+
+	/*
+	 * Increment the count of enabled probes on this probe's provider;
+	 * the provider can't go away while the probe still exists. We
+	 * must increment this even if we aren't able to properly enable
+	 * this probe.
+	 */
+	mutex_enter(&probe->ftp_prov->ftp_mtx);
+	probe->ftp_prov->ftp_rcount++;
+	mutex_exit(&probe->ftp_prov->ftp_mtx);
+
+	/*
+	 * If this probe's provider is retired (meaning it was valid in a
+	 * previously exec'ed incarnation of this address space), bail out. The
+	 * provider can't go away while we're in this code path.
+	 */
+	if (probe->ftp_prov->ftp_retired)
+		return;
+
+	/*
+	 * If we can't find the process, it may be that we're in the context of
+	 * a fork in which the traced process is being born and we're copying
+	 * USDT probes. Otherwise, the process is gone so bail.
+	 */
+	if ((p = sprlock(probe->ftp_pid)) == NULL) {
+		if ((curproc->p_flag & SFORKING) == 0)
+			return;
+
+		mutex_enter(&pidlock);
+		p = prfind(probe->ftp_pid);
+
+		/*
+		 * Confirm that curproc is indeed forking the process in which
+		 * we're trying to enable probes.
+		 */
+		ASSERT(p != NULL);
+		ASSERT(p->p_parent == curproc);
+		ASSERT(p->p_stat == SIDL);
+
+		mutex_enter(&p->p_lock);
+		mutex_exit(&pidlock);
+
+		sprlock_proc(p);
+	}
+
+	ASSERT(!(p->p_flag & SVFORK));
+	mutex_exit(&p->p_lock);
+
+	/*
+	 * We have to enable the trap entry point before any user threads have
+	 * the chance to execute the trap instruction we're about to place
+	 * in their process's text.
+	 */
+	fasttrap_enable_callbacks();
+
+	/*
+	 * Enable all the tracepoints and add this probe's id to each
+	 * tracepoint's list of active probes.
+	 */
+	for (i = 0; i < probe->ftp_ntps; i++) {
+		if ((rc = fasttrap_tracepoint_enable(p, probe, i)) != 0) {
+			/*
+			 * If enabling the tracepoint failed completely,
+			 * we don't have to disable it; if the failure
+			 * was only partial we must disable it.
+			 */
+			if (rc == FASTTRAP_ENABLE_FAIL)
+				i--;
+			else
+				ASSERT(rc == FASTTRAP_ENABLE_PARTIAL);
+
+			/*
+			 * Back up and pull out all the tracepoints we've
+			 * created so far for this probe.
+			 */
+			while (i >= 0) {
+				fasttrap_tracepoint_disable(p, probe, i);
+				i--;
+			}
+
+			mutex_enter(&p->p_lock);
+			sprunlock(p);
+
+			/*
+			 * Since we're not actually enabling this probe,
+			 * drop our reference on the trap table entry.
+			 */
+			fasttrap_disable_callbacks();
+			return;
+		}
+	}
+
+	mutex_enter(&p->p_lock);
+	sprunlock(p);
+
+	probe->ftp_enabled = 1;
+}
+
+/*ARGSUSED*/
+static void
+fasttrap_pid_disable(void *arg, dtrace_id_t id, void *parg)
+{
+	fasttrap_probe_t *probe = parg;
+	fasttrap_provider_t *provider = probe->ftp_prov;
+	proc_t *p;
+	int i, whack = 0;
+
+	ASSERT(id == probe->ftp_id);
+
+	/*
+	 * We won't be able to acquire a /proc-esque lock on the process
+	 * iff the process is dead and gone. In this case, we rely on the
+	 * provider lock as a point of mutual exclusion to prevent other
+	 * DTrace consumers from disabling this probe.
+	 */
+	if ((p = sprlock(probe->ftp_pid)) != NULL) {
+		ASSERT(!(p->p_flag & SVFORK));
+		mutex_exit(&p->p_lock);
+	}
+
+	mutex_enter(&provider->ftp_mtx);
+
+	/*
+	 * Disable all the associated tracepoints (for fully enabled probes).
+	 */
+	if (probe->ftp_enabled) {
+		for (i = 0; i < probe->ftp_ntps; i++) {
+			fasttrap_tracepoint_disable(p, probe, i);
+		}
+	}
+
+	ASSERT(provider->ftp_rcount > 0);
+	provider->ftp_rcount--;
+
+	if (p != NULL) {
+		/*
+		 * Even though we may not be able to remove it entirely, we
+		 * mark this retired provider to get a chance to remove some
+		 * of the associated probes.
+		 */
+		if (provider->ftp_retired && !provider->ftp_marked)
+			whack = provider->ftp_marked = 1;
+		mutex_exit(&provider->ftp_mtx);
+
+		mutex_enter(&p->p_lock);
+		sprunlock(p);
+	} else {
+		/*
+		 * If the process is dead, we're just waiting for the
+		 * last probe to be disabled to be able to free it.
+		 */
+		if (provider->ftp_rcount == 0 && !provider->ftp_marked)
+			whack = provider->ftp_marked = 1;
+		mutex_exit(&provider->ftp_mtx);
+	}
+
+	if (whack)
+		fasttrap_pid_cleanup();
+
+	if (!probe->ftp_enabled)
+		return;
+
+	probe->ftp_enabled = 0;
+
+	ASSERT(MUTEX_HELD(&cpu_lock));
+	fasttrap_disable_callbacks();
+}
+
+/*ARGSUSED*/
+static void
+fasttrap_pid_getargdesc(void *arg, dtrace_id_t id, void *parg,
+    dtrace_argdesc_t *desc)
+{
+	fasttrap_probe_t *probe = parg;
+	char *str;
+	int i, ndx;
+
+	desc->dtargd_native[0] = '\0';
+	desc->dtargd_xlate[0] = '\0';
+
+	if (probe->ftp_prov->ftp_retired != 0 ||
+	    desc->dtargd_ndx >= probe->ftp_nargs) {
+		desc->dtargd_ndx = DTRACE_ARGNONE;
+		return;
+	}
+
+	ndx = (probe->ftp_argmap != NULL) ?
+	    probe->ftp_argmap[desc->dtargd_ndx] : desc->dtargd_ndx;
+
+	str = probe->ftp_ntypes;
+	for (i = 0; i < ndx; i++) {
+		str += strlen(str) + 1;
+	}
+
+	ASSERT(strlen(str + 1) < sizeof (desc->dtargd_native));
+	(void) strcpy(desc->dtargd_native, str);
+
+	if (probe->ftp_xtypes == NULL)
+		return;
+
+	str = probe->ftp_xtypes;
+	for (i = 0; i < desc->dtargd_ndx; i++) {
+		str += strlen(str) + 1;
+	}
+
+	ASSERT(strlen(str + 1) < sizeof (desc->dtargd_xlate));
+	(void) strcpy(desc->dtargd_xlate, str);
+}
+
+/*ARGSUSED*/
+static void
+fasttrap_pid_destroy(void *arg, dtrace_id_t id, void *parg)
+{
+	fasttrap_probe_t *probe = parg;
+	int i;
+	size_t size;
+
+	ASSERT(probe != NULL);
+	ASSERT(!probe->ftp_enabled);
+	ASSERT(fasttrap_total >= probe->ftp_ntps);
+
+	atomic_add_32(&fasttrap_total, -probe->ftp_ntps);
+	size = offsetof(fasttrap_probe_t, ftp_tps[probe->ftp_ntps]);
+
+	if (probe->ftp_gen + 1 >= fasttrap_mod_gen)
+		fasttrap_mod_barrier(probe->ftp_gen);
+
+	for (i = 0; i < probe->ftp_ntps; i++) {
+		kmem_free(probe->ftp_tps[i].fit_tp,
+		    sizeof (fasttrap_tracepoint_t));
+	}
+
+	kmem_free(probe, size);
+}
+
+
+static const dtrace_pattr_t pid_attr = {
+{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_ISA },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_ISA },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+};
+
+static dtrace_pops_t pid_pops = {
+	fasttrap_pid_provide,
+	NULL,
+	fasttrap_pid_enable,
+	fasttrap_pid_disable,
+	NULL,
+	NULL,
+	fasttrap_pid_getargdesc,
+	fasttrap_pid_getarg,
+	NULL,
+	fasttrap_pid_destroy
+};
+
+static dtrace_pops_t usdt_pops = {
+	fasttrap_pid_provide,
+	NULL,
+	fasttrap_pid_enable,
+	fasttrap_pid_disable,
+	NULL,
+	NULL,
+	fasttrap_pid_getargdesc,
+	fasttrap_usdt_getarg,
+	NULL,
+	fasttrap_pid_destroy
+};
+
+static fasttrap_proc_t *
+fasttrap_proc_lookup(pid_t pid)
+{
+	fasttrap_bucket_t *bucket;
+	fasttrap_proc_t *fprc, *new_fprc;
+
+	bucket = &fasttrap_procs.fth_table[FASTTRAP_PROCS_INDEX(pid)];
+	mutex_enter(&bucket->ftb_mtx);
+
+	for (fprc = bucket->ftb_data; fprc != NULL; fprc = fprc->ftpc_next) {
+		if (fprc->ftpc_pid == pid && fprc->ftpc_acount != 0) {
+			mutex_enter(&fprc->ftpc_mtx);
+			mutex_exit(&bucket->ftb_mtx);
+			fprc->ftpc_rcount++;
+			atomic_add_64(&fprc->ftpc_acount, 1);
+			mutex_exit(&fprc->ftpc_mtx);
+
+			return (fprc);
+		}
+	}
+
+	/*
+	 * Drop the bucket lock so we don't try to perform a sleeping
+	 * allocation under it.
+	 */
+	mutex_exit(&bucket->ftb_mtx);
+
+	new_fprc = kmem_zalloc(sizeof (fasttrap_proc_t), KM_SLEEP);
+	new_fprc->ftpc_pid = pid;
+	new_fprc->ftpc_rcount = 1;
+	new_fprc->ftpc_acount = 1;
+
+	mutex_enter(&bucket->ftb_mtx);
+
+	/*
+	 * Take another lap through the list to make sure a proc hasn't
+	 * been created for this pid while we weren't under the bucket lock.
+	 */
+	for (fprc = bucket->ftb_data; fprc != NULL; fprc = fprc->ftpc_next) {
+		if (fprc->ftpc_pid == pid && fprc->ftpc_acount != 0) {
+			mutex_enter(&fprc->ftpc_mtx);
+			mutex_exit(&bucket->ftb_mtx);
+			fprc->ftpc_rcount++;
+			atomic_add_64(&fprc->ftpc_acount, 1);
+			mutex_exit(&fprc->ftpc_mtx);
+
+			kmem_free(new_fprc, sizeof (fasttrap_proc_t));
+
+			return (fprc);
+		}
+	}
+
+	new_fprc->ftpc_next = bucket->ftb_data;
+	bucket->ftb_data = new_fprc;
+
+	mutex_exit(&bucket->ftb_mtx);
+
+	return (new_fprc);
+}
+
+static void
+fasttrap_proc_release(fasttrap_proc_t *proc)
+{
+	fasttrap_bucket_t *bucket;
+	fasttrap_proc_t *fprc, **fprcp;
+	pid_t pid = proc->ftpc_pid;
+
+	mutex_enter(&proc->ftpc_mtx);
+
+	ASSERT(proc->ftpc_rcount != 0);
+
+	if (--proc->ftpc_rcount != 0) {
+		mutex_exit(&proc->ftpc_mtx);
+		return;
+	}
+
+	mutex_exit(&proc->ftpc_mtx);
+
+	/*
+	 * There should definitely be no live providers associated with this
+	 * process at this point.
+	 */
+	ASSERT(proc->ftpc_acount == 0);
+
+	bucket = &fasttrap_procs.fth_table[FASTTRAP_PROCS_INDEX(pid)];
+	mutex_enter(&bucket->ftb_mtx);
+
+	fprcp = (fasttrap_proc_t **)&bucket->ftb_data;
+	while ((fprc = *fprcp) != NULL) {
+		if (fprc == proc)
+			break;
+
+		fprcp = &fprc->ftpc_next;
+	}
+
+	/*
+	 * Something strange has happened if we can't find the proc.
+	 */
+	ASSERT(fprc != NULL);
+
+	*fprcp = fprc->ftpc_next;
+
+	mutex_exit(&bucket->ftb_mtx);
+
+	kmem_free(fprc, sizeof (fasttrap_proc_t));
+}
+
+/*
+ * Lookup a fasttrap-managed provider based on its name and associated pid.
+ * If the pattr argument is non-NULL, this function instantiates the provider
+ * if it doesn't exist otherwise it returns NULL. The provider is returned
+ * with its lock held.
+ */
+static fasttrap_provider_t *
+fasttrap_provider_lookup(pid_t pid, const char *name,
+    const dtrace_pattr_t *pattr)
+{
+	fasttrap_provider_t *fp, *new_fp = NULL;
+	fasttrap_bucket_t *bucket;
+	char provname[DTRACE_PROVNAMELEN];
+	proc_t *p;
+	cred_t *cred;
+
+	ASSERT(strlen(name) < sizeof (fp->ftp_name));
+	ASSERT(pattr != NULL);
+
+	bucket = &fasttrap_provs.fth_table[FASTTRAP_PROVS_INDEX(pid, name)];
+	mutex_enter(&bucket->ftb_mtx);
+
+	/*
+	 * Take a lap through the list and return the match if we find it.
+	 */
+	for (fp = bucket->ftb_data; fp != NULL; fp = fp->ftp_next) {
+		if (fp->ftp_pid == pid && strcmp(fp->ftp_name, name) == 0 &&
+		    !fp->ftp_retired) {
+			mutex_enter(&fp->ftp_mtx);
+			mutex_exit(&bucket->ftb_mtx);
+			return (fp);
+		}
+	}
+
+	/*
+	 * Drop the bucket lock so we don't try to perform a sleeping
+	 * allocation under it.
+	 */
+	mutex_exit(&bucket->ftb_mtx);
+
+	/*
+	 * Make sure the process exists, isn't a child created as the result
+	 * of a vfork(2), and isn't a zombie (but may be in fork).
+	 */
+	mutex_enter(&pidlock);
+	if ((p = prfind(pid)) == NULL) {
+		mutex_exit(&pidlock);
+		return (NULL);
+	}
+	mutex_enter(&p->p_lock);
+	mutex_exit(&pidlock);
+	if (p->p_flag & (SVFORK | SEXITING)) {
+		mutex_exit(&p->p_lock);
+		return (NULL);
+	}
+
+	/*
+	 * Increment p_dtrace_probes so that the process knows to inform us
+	 * when it exits or execs. fasttrap_provider_free() decrements this
+	 * when we're done with this provider.
+	 */
+	p->p_dtrace_probes++;
+
+	/*
+	 * Grab the credentials for this process so we have
+	 * something to pass to dtrace_register().
+	 */
+	mutex_enter(&p->p_crlock);
+	crhold(p->p_cred);
+	cred = p->p_cred;
+	mutex_exit(&p->p_crlock);
+	mutex_exit(&p->p_lock);
+
+	new_fp = kmem_zalloc(sizeof (fasttrap_provider_t), KM_SLEEP);
+	new_fp->ftp_pid = pid;
+	new_fp->ftp_proc = fasttrap_proc_lookup(pid);
+
+	ASSERT(new_fp->ftp_proc != NULL);
+
+	mutex_enter(&bucket->ftb_mtx);
+
+	/*
+	 * Take another lap through the list to make sure a provider hasn't
+	 * been created for this pid while we weren't under the bucket lock.
+	 */
+	for (fp = bucket->ftb_data; fp != NULL; fp = fp->ftp_next) {
+		if (fp->ftp_pid == pid && strcmp(fp->ftp_name, name) == 0 &&
+		    !fp->ftp_retired) {
+			mutex_enter(&fp->ftp_mtx);
+			mutex_exit(&bucket->ftb_mtx);
+			fasttrap_provider_free(new_fp);
+			crfree(cred);
+			return (fp);
+		}
+	}
+
+	(void) strcpy(new_fp->ftp_name, name);
+
+	/*
+	 * Fail and return NULL if either the provider name is too long
+	 * or we fail to register this new provider with the DTrace
+	 * framework. Note that this is the only place we ever construct
+	 * the full provider name -- we keep it in pieces in the provider
+	 * structure.
+	 */
+	if (snprintf(provname, sizeof (provname), "%s%u", name, (uint_t)pid) >=
+	    sizeof (provname) ||
+	    dtrace_register(provname, pattr,
+	    DTRACE_PRIV_PROC | DTRACE_PRIV_OWNER | DTRACE_PRIV_ZONEOWNER, cred,
+	    pattr == &pid_attr ? &pid_pops : &usdt_pops, new_fp,
+	    &new_fp->ftp_provid) != 0) {
+		mutex_exit(&bucket->ftb_mtx);
+		fasttrap_provider_free(new_fp);
+		crfree(cred);
+		return (NULL);
+	}
+
+	new_fp->ftp_next = bucket->ftb_data;
+	bucket->ftb_data = new_fp;
+
+	mutex_enter(&new_fp->ftp_mtx);
+	mutex_exit(&bucket->ftb_mtx);
+
+	crfree(cred);
+	return (new_fp);
+}
+
+static void
+fasttrap_provider_free(fasttrap_provider_t *provider)
+{
+	pid_t pid = provider->ftp_pid;
+	proc_t *p;
+
+	/*
+	 * There need to be no associated enabled probes, no consumers
+	 * creating probes, and no meta providers referencing this provider.
+	 */
+	ASSERT(provider->ftp_rcount == 0);
+	ASSERT(provider->ftp_ccount == 0);
+	ASSERT(provider->ftp_mcount == 0);
+
+	fasttrap_proc_release(provider->ftp_proc);
+
+	kmem_free(provider, sizeof (fasttrap_provider_t));
+
+	/*
+	 * Decrement p_dtrace_probes on the process whose provider we're
+	 * freeing. We don't have to worry about clobbering somone else's
+	 * modifications to it because we have locked the bucket that
+	 * corresponds to this process's hash chain in the provider hash
+	 * table. Don't sweat it if we can't find the process.
+	 */
+	mutex_enter(&pidlock);
+	if ((p = prfind(pid)) == NULL) {
+		mutex_exit(&pidlock);
+		return;
+	}
+
+	mutex_enter(&p->p_lock);
+	mutex_exit(&pidlock);
+
+	p->p_dtrace_probes--;
+	mutex_exit(&p->p_lock);
+}
+
+static void
+fasttrap_provider_retire(pid_t pid, const char *name, int mprov)
+{
+	fasttrap_provider_t *fp;
+	fasttrap_bucket_t *bucket;
+	dtrace_provider_id_t provid;
+
+	ASSERT(strlen(name) < sizeof (fp->ftp_name));
+
+	bucket = &fasttrap_provs.fth_table[FASTTRAP_PROVS_INDEX(pid, name)];
+	mutex_enter(&bucket->ftb_mtx);
+
+	for (fp = bucket->ftb_data; fp != NULL; fp = fp->ftp_next) {
+		if (fp->ftp_pid == pid && strcmp(fp->ftp_name, name) == 0 &&
+		    !fp->ftp_retired)
+			break;
+	}
+
+	if (fp == NULL) {
+		mutex_exit(&bucket->ftb_mtx);
+		return;
+	}
+
+	mutex_enter(&fp->ftp_mtx);
+	ASSERT(!mprov || fp->ftp_mcount > 0);
+	if (mprov && --fp->ftp_mcount != 0)  {
+		mutex_exit(&fp->ftp_mtx);
+		mutex_exit(&bucket->ftb_mtx);
+		return;
+	}
+
+	/*
+	 * Mark the provider to be removed in our post-processing step, mark it
+	 * retired, and drop the active count on its proc. Marking it indicates
+	 * that we should try to remove it; setting the retired flag indicates
+	 * that we're done with this provider; dropping the active the proc
+	 * releases our hold, and when this reaches zero (as it will during
+	 * exit or exec) the proc and associated providers become defunct.
+	 *
+	 * We obviously need to take the bucket lock before the provider lock
+	 * to perform the lookup, but we need to drop the provider lock
+	 * before calling into the DTrace framework since we acquire the
+	 * provider lock in callbacks invoked from the DTrace framework. The
+	 * bucket lock therefore protects the integrity of the provider hash
+	 * table.
+	 */
+	atomic_add_64(&fp->ftp_proc->ftpc_acount, -1);
+	fp->ftp_retired = 1;
+	fp->ftp_marked = 1;
+	provid = fp->ftp_provid;
+	mutex_exit(&fp->ftp_mtx);
+
+	/*
+	 * We don't have to worry about invalidating the same provider twice
+	 * since fasttrap_provider_lookup() will ignore provider that have
+	 * been marked as retired.
+	 */
+	dtrace_invalidate(provid);
+
+	mutex_exit(&bucket->ftb_mtx);
+
+	fasttrap_pid_cleanup();
+}
+
+static int
+fasttrap_uint32_cmp(const void *ap, const void *bp)
+{
+	return (*(const uint32_t *)ap - *(const uint32_t *)bp);
+}
+
+static int
+fasttrap_uint64_cmp(const void *ap, const void *bp)
+{
+	return (*(const uint64_t *)ap - *(const uint64_t *)bp);
+}
+
+static int
+fasttrap_add_probe(fasttrap_probe_spec_t *pdata)
+{
+	fasttrap_provider_t *provider;
+	fasttrap_probe_t *pp;
+	fasttrap_tracepoint_t *tp;
+	char *name;
+	int i, aframes, whack;
+
+	/*
+	 * There needs to be at least one desired trace point.
+	 */
+	if (pdata->ftps_noffs == 0)
+		return (EINVAL);
+
+	switch (pdata->ftps_type) {
+	case DTFTP_ENTRY:
+		name = "entry";
+		aframes = FASTTRAP_ENTRY_AFRAMES;
+		break;
+	case DTFTP_RETURN:
+		name = "return";
+		aframes = FASTTRAP_RETURN_AFRAMES;
+		break;
+	case DTFTP_OFFSETS:
+		name = NULL;
+		break;
+	default:
+		return (EINVAL);
+	}
+
+	if ((provider = fasttrap_provider_lookup(pdata->ftps_pid,
+	    FASTTRAP_PID_NAME, &pid_attr)) == NULL)
+		return (ESRCH);
+
+	/*
+	 * Increment this reference count to indicate that a consumer is
+	 * actively adding a new probe associated with this provider. This
+	 * prevents the provider from being deleted -- we'll need to check
+	 * for pending deletions when we drop this reference count.
+	 */
+	provider->ftp_ccount++;
+	mutex_exit(&provider->ftp_mtx);
+
+	/*
+	 * Grab the creation lock to ensure consistency between calls to
+	 * dtrace_probe_lookup() and dtrace_probe_create() in the face of
+	 * other threads creating probes. We must drop the provider lock
+	 * before taking this lock to avoid a three-way deadlock with the
+	 * DTrace framework.
+	 */
+	mutex_enter(&provider->ftp_cmtx);
+
+	if (name == NULL) {
+		for (i = 0; i < pdata->ftps_noffs; i++) {
+			char name_str[17];
+
+			(void) sprintf(name_str, "%llx",
+			    (unsigned long long)pdata->ftps_offs[i]);
+
+			if (dtrace_probe_lookup(provider->ftp_provid,
+			    pdata->ftps_mod, pdata->ftps_func, name_str) != 0)
+				continue;
+
+			atomic_add_32(&fasttrap_total, 1);
+
+			if (fasttrap_total > fasttrap_max) {
+				atomic_add_32(&fasttrap_total, -1);
+				goto no_mem;
+			}
+
+			pp = kmem_zalloc(sizeof (fasttrap_probe_t), KM_SLEEP);
+
+			pp->ftp_prov = provider;
+			pp->ftp_faddr = pdata->ftps_pc;
+			pp->ftp_fsize = pdata->ftps_size;
+			pp->ftp_pid = pdata->ftps_pid;
+			pp->ftp_ntps = 1;
+
+			tp = kmem_zalloc(sizeof (fasttrap_tracepoint_t),
+			    KM_SLEEP);
+
+			tp->ftt_proc = provider->ftp_proc;
+			tp->ftt_pc = pdata->ftps_offs[i] + pdata->ftps_pc;
+			tp->ftt_pid = pdata->ftps_pid;
+
+			pp->ftp_tps[0].fit_tp = tp;
+			pp->ftp_tps[0].fit_id.fti_probe = pp;
+			pp->ftp_tps[0].fit_id.fti_ptype = pdata->ftps_type;
+
+			pp->ftp_id = dtrace_probe_create(provider->ftp_provid,
+			    pdata->ftps_mod, pdata->ftps_func, name_str,
+			    FASTTRAP_OFFSET_AFRAMES, pp);
+		}
+
+	} else if (dtrace_probe_lookup(provider->ftp_provid, pdata->ftps_mod,
+	    pdata->ftps_func, name) == 0) {
+		atomic_add_32(&fasttrap_total, pdata->ftps_noffs);
+
+		if (fasttrap_total > fasttrap_max) {
+			atomic_add_32(&fasttrap_total, -pdata->ftps_noffs);
+			goto no_mem;
+		}
+
+		/*
+		 * Make sure all tracepoint program counter values are unique.
+		 * We later assume that each probe has exactly one tracepoint
+		 * for a given pc.
+		 */
+		qsort(pdata->ftps_offs, pdata->ftps_noffs,
+		    sizeof (uint64_t), fasttrap_uint64_cmp);
+		for (i = 1; i < pdata->ftps_noffs; i++) {
+			if (pdata->ftps_offs[i] > pdata->ftps_offs[i - 1])
+				continue;
+
+			atomic_add_32(&fasttrap_total, -pdata->ftps_noffs);
+			goto no_mem;
+		}
+
+		ASSERT(pdata->ftps_noffs > 0);
+		pp = kmem_zalloc(offsetof(fasttrap_probe_t,
+		    ftp_tps[pdata->ftps_noffs]), KM_SLEEP);
+
+		pp->ftp_prov = provider;
+		pp->ftp_faddr = pdata->ftps_pc;
+		pp->ftp_fsize = pdata->ftps_size;
+		pp->ftp_pid = pdata->ftps_pid;
+		pp->ftp_ntps = pdata->ftps_noffs;
+
+		for (i = 0; i < pdata->ftps_noffs; i++) {
+			tp = kmem_zalloc(sizeof (fasttrap_tracepoint_t),
+			    KM_SLEEP);
+
+			tp->ftt_proc = provider->ftp_proc;
+			tp->ftt_pc = pdata->ftps_offs[i] + pdata->ftps_pc;
+			tp->ftt_pid = pdata->ftps_pid;
+
+			pp->ftp_tps[i].fit_tp = tp;
+			pp->ftp_tps[i].fit_id.fti_probe = pp;
+			pp->ftp_tps[i].fit_id.fti_ptype = pdata->ftps_type;
+		}
+
+		pp->ftp_id = dtrace_probe_create(provider->ftp_provid,
+		    pdata->ftps_mod, pdata->ftps_func, name, aframes, pp);
+	}
+
+	mutex_exit(&provider->ftp_cmtx);
+
+	/*
+	 * We know that the provider is still valid since we incremented the
+	 * creation reference count. If someone tried to clean up this provider
+	 * while we were using it (e.g. because the process called exec(2) or
+	 * exit(2)), take note of that and try to clean it up now.
+	 */
+	mutex_enter(&provider->ftp_mtx);
+	provider->ftp_ccount--;
+	whack = provider->ftp_retired;
+	mutex_exit(&provider->ftp_mtx);
+
+	if (whack)
+		fasttrap_pid_cleanup();
+
+	return (0);
+
+no_mem:
+	/*
+	 * If we've exhausted the allowable resources, we'll try to remove
+	 * this provider to free some up. This is to cover the case where
+	 * the user has accidentally created many more probes than was
+	 * intended (e.g. pid123:::).
+	 */
+	mutex_exit(&provider->ftp_cmtx);
+	mutex_enter(&provider->ftp_mtx);
+	provider->ftp_ccount--;
+	provider->ftp_marked = 1;
+	mutex_exit(&provider->ftp_mtx);
+
+	fasttrap_pid_cleanup();
+
+	return (ENOMEM);
+}
+
+/*ARGSUSED*/
+static void *
+fasttrap_meta_provide(void *arg, dtrace_helper_provdesc_t *dhpv, pid_t pid)
+{
+	fasttrap_provider_t *provider;
+
+	/*
+	 * A 32-bit unsigned integer (like a pid for example) can be
+	 * expressed in 10 or fewer decimal digits. Make sure that we'll
+	 * have enough space for the provider name.
+	 */
+	if (strlen(dhpv->dthpv_provname) + 10 >=
+	    sizeof (provider->ftp_name)) {
+		cmn_err(CE_WARN, "failed to instantiate provider %s: "
+		    "name too long to accomodate pid", dhpv->dthpv_provname);
+		return (NULL);
+	}
+
+	/*
+	 * Don't let folks spoof the true pid provider.
+	 */
+	if (strcmp(dhpv->dthpv_provname, FASTTRAP_PID_NAME) == 0) {
+		cmn_err(CE_WARN, "failed to instantiate provider %s: "
+		    "%s is an invalid name", dhpv->dthpv_provname,
+		    FASTTRAP_PID_NAME);
+		return (NULL);
+	}
+
+	/*
+	 * The highest stability class that fasttrap supports is ISA; cap
+	 * the stability of the new provider accordingly.
+	 */
+	if (dhpv->dthpv_pattr.dtpa_provider.dtat_class > DTRACE_CLASS_ISA)
+		dhpv->dthpv_pattr.dtpa_provider.dtat_class = DTRACE_CLASS_ISA;
+	if (dhpv->dthpv_pattr.dtpa_mod.dtat_class > DTRACE_CLASS_ISA)
+		dhpv->dthpv_pattr.dtpa_mod.dtat_class = DTRACE_CLASS_ISA;
+	if (dhpv->dthpv_pattr.dtpa_func.dtat_class > DTRACE_CLASS_ISA)
+		dhpv->dthpv_pattr.dtpa_func.dtat_class = DTRACE_CLASS_ISA;
+	if (dhpv->dthpv_pattr.dtpa_name.dtat_class > DTRACE_CLASS_ISA)
+		dhpv->dthpv_pattr.dtpa_name.dtat_class = DTRACE_CLASS_ISA;
+	if (dhpv->dthpv_pattr.dtpa_args.dtat_class > DTRACE_CLASS_ISA)
+		dhpv->dthpv_pattr.dtpa_args.dtat_class = DTRACE_CLASS_ISA;
+
+	if ((provider = fasttrap_provider_lookup(pid, dhpv->dthpv_provname,
+	    &dhpv->dthpv_pattr)) == NULL) {
+		cmn_err(CE_WARN, "failed to instantiate provider %s for "
+		    "process %u",  dhpv->dthpv_provname, (uint_t)pid);
+		return (NULL);
+	}
+
+	/*
+	 * Up the meta provider count so this provider isn't removed until
+	 * the meta provider has been told to remove it.
+	 */
+	provider->ftp_mcount++;
+
+	mutex_exit(&provider->ftp_mtx);
+
+	return (provider);
+}
+
+/*ARGSUSED*/
+static void
+fasttrap_meta_create_probe(void *arg, void *parg,
+    dtrace_helper_probedesc_t *dhpb)
+{
+	fasttrap_provider_t *provider = parg;
+	fasttrap_probe_t *pp;
+	fasttrap_tracepoint_t *tp;
+	int i, j;
+	uint32_t ntps;
+
+	/*
+	 * Since the meta provider count is non-zero we don't have to worry
+	 * about this provider disappearing.
+	 */
+	ASSERT(provider->ftp_mcount > 0);
+
+	/*
+	 * The offsets must be unique.
+	 */
+	qsort(dhpb->dthpb_offs, dhpb->dthpb_noffs, sizeof (uint32_t),
+	    fasttrap_uint32_cmp);
+	for (i = 1; i < dhpb->dthpb_noffs; i++) {
+		if (dhpb->dthpb_base + dhpb->dthpb_offs[i] <=
+		    dhpb->dthpb_base + dhpb->dthpb_offs[i - 1])
+			return;
+	}
+
+	qsort(dhpb->dthpb_enoffs, dhpb->dthpb_nenoffs, sizeof (uint32_t),
+	    fasttrap_uint32_cmp);
+	for (i = 1; i < dhpb->dthpb_nenoffs; i++) {
+		if (dhpb->dthpb_base + dhpb->dthpb_enoffs[i] <=
+		    dhpb->dthpb_base + dhpb->dthpb_enoffs[i - 1])
+			return;
+	}
+
+	/*
+	 * Grab the creation lock to ensure consistency between calls to
+	 * dtrace_probe_lookup() and dtrace_probe_create() in the face of
+	 * other threads creating probes.
+	 */
+	mutex_enter(&provider->ftp_cmtx);
+
+	if (dtrace_probe_lookup(provider->ftp_provid, dhpb->dthpb_mod,
+	    dhpb->dthpb_func, dhpb->dthpb_name) != 0) {
+		mutex_exit(&provider->ftp_cmtx);
+		return;
+	}
+
+	ntps = dhpb->dthpb_noffs + dhpb->dthpb_nenoffs;
+	ASSERT(ntps > 0);
+
+	atomic_add_32(&fasttrap_total, ntps);
+
+	if (fasttrap_total > fasttrap_max) {
+		atomic_add_32(&fasttrap_total, -ntps);
+		mutex_exit(&provider->ftp_cmtx);
+		return;
+	}
+
+	pp = kmem_zalloc(offsetof(fasttrap_probe_t, ftp_tps[ntps]), KM_SLEEP);
+
+	pp->ftp_prov = provider;
+	pp->ftp_pid = provider->ftp_pid;
+	pp->ftp_ntps = ntps;
+	pp->ftp_nargs = dhpb->dthpb_xargc;
+	pp->ftp_xtypes = dhpb->dthpb_xtypes;
+	pp->ftp_ntypes = dhpb->dthpb_ntypes;
+
+	/*
+	 * First create a tracepoint for each actual point of interest.
+	 */
+	for (i = 0; i < dhpb->dthpb_noffs; i++) {
+		tp = kmem_zalloc(sizeof (fasttrap_tracepoint_t), KM_SLEEP);
+
+		tp->ftt_proc = provider->ftp_proc;
+		tp->ftt_pc = dhpb->dthpb_base + dhpb->dthpb_offs[i];
+		tp->ftt_pid = provider->ftp_pid;
+
+		pp->ftp_tps[i].fit_tp = tp;
+		pp->ftp_tps[i].fit_id.fti_probe = pp;
+#ifdef __sparc
+		pp->ftp_tps[i].fit_id.fti_ptype = DTFTP_POST_OFFSETS;
+#else
+		pp->ftp_tps[i].fit_id.fti_ptype = DTFTP_OFFSETS;
+#endif
+	}
+
+	/*
+	 * Then create a tracepoint for each is-enabled point.
+	 */
+	for (j = 0; i < ntps; i++, j++) {
+		tp = kmem_zalloc(sizeof (fasttrap_tracepoint_t), KM_SLEEP);
+
+		tp->ftt_proc = provider->ftp_proc;
+		tp->ftt_pc = dhpb->dthpb_base + dhpb->dthpb_enoffs[j];
+		tp->ftt_pid = provider->ftp_pid;
+
+		pp->ftp_tps[i].fit_tp = tp;
+		pp->ftp_tps[i].fit_id.fti_probe = pp;
+		pp->ftp_tps[i].fit_id.fti_ptype = DTFTP_IS_ENABLED;
+	}
+
+	/*
+	 * If the arguments are shuffled around we set the argument remapping
+	 * table. Later, when the probe fires, we only remap the arguments
+	 * if the table is non-NULL.
+	 */
+	for (i = 0; i < dhpb->dthpb_xargc; i++) {
+		if (dhpb->dthpb_args[i] != i) {
+			pp->ftp_argmap = dhpb->dthpb_args;
+			break;
+		}
+	}
+
+	/*
+	 * The probe is fully constructed -- register it with DTrace.
+	 */
+	pp->ftp_id = dtrace_probe_create(provider->ftp_provid, dhpb->dthpb_mod,
+	    dhpb->dthpb_func, dhpb->dthpb_name, FASTTRAP_OFFSET_AFRAMES, pp);
+
+	mutex_exit(&provider->ftp_cmtx);
+}
+
+/*ARGSUSED*/
+static void
+fasttrap_meta_remove(void *arg, dtrace_helper_provdesc_t *dhpv, pid_t pid)
+{
+	/*
+	 * Clean up the USDT provider. There may be active consumers of the
+	 * provider busy adding probes, no damage will actually befall the
+	 * provider until that count has dropped to zero. This just puts
+	 * the provider on death row.
+	 */
+	fasttrap_provider_retire(pid, dhpv->dthpv_provname, 1);
+}
+
+static dtrace_mops_t fasttrap_mops = {
+	fasttrap_meta_create_probe,
+	fasttrap_meta_provide,
+	fasttrap_meta_remove
+};
+
+/*ARGSUSED*/
+static int
+fasttrap_open(dev_t *devp, int flag, int otyp, cred_t *cred_p)
+{
+	return (0);
+}
+
+/*ARGSUSED*/
+static int
+fasttrap_ioctl(dev_t dev, int cmd, intptr_t arg, int md, cred_t *cr, int *rv)
+{
+	if (!dtrace_attached())
+		return (EAGAIN);
+
+	if (cmd == FASTTRAPIOC_MAKEPROBE) {
+		fasttrap_probe_spec_t *uprobe = (void *)arg;
+		fasttrap_probe_spec_t *probe;
+		uint64_t noffs;
+		size_t size;
+		int ret;
+		char *c;
+
+		if (copyin(&uprobe->ftps_noffs, &noffs,
+		    sizeof (uprobe->ftps_noffs)))
+			return (EFAULT);
+
+		/*
+		 * Probes must have at least one tracepoint.
+		 */
+		if (noffs == 0)
+			return (EINVAL);
+
+		size = sizeof (fasttrap_probe_spec_t) +
+		    sizeof (probe->ftps_offs[0]) * (noffs - 1);
+
+		if (size > 1024 * 1024)
+			return (ENOMEM);
+
+		probe = kmem_alloc(size, KM_SLEEP);
+
+		if (copyin(uprobe, probe, size) != 0) {
+			kmem_free(probe, size);
+			return (EFAULT);
+		}
+
+		/*
+		 * Verify that the function and module strings contain no
+		 * funny characters.
+		 */
+		for (c = &probe->ftps_func[0]; *c != '\0'; c++) {
+			if (*c < 0x20 || 0x7f <= *c) {
+				ret = EINVAL;
+				goto err;
+			}
+		}
+
+		for (c = &probe->ftps_mod[0]; *c != '\0'; c++) {
+			if (*c < 0x20 || 0x7f <= *c) {
+				ret = EINVAL;
+				goto err;
+			}
+		}
+
+		if (!PRIV_POLICY_CHOICE(cr, PRIV_ALL, B_FALSE)) {
+			proc_t *p;
+			pid_t pid = probe->ftps_pid;
+
+			mutex_enter(&pidlock);
+			/*
+			 * Report an error if the process doesn't exist
+			 * or is actively being birthed.
+			 */
+			if ((p = prfind(pid)) == NULL || p->p_stat == SIDL) {
+				mutex_exit(&pidlock);
+				return (ESRCH);
+			}
+			mutex_enter(&p->p_lock);
+			mutex_exit(&pidlock);
+
+			if ((ret = priv_proc_cred_perm(cr, p, NULL,
+			    VREAD | VWRITE)) != 0) {
+				mutex_exit(&p->p_lock);
+				return (ret);
+			}
+
+			mutex_exit(&p->p_lock);
+		}
+
+		ret = fasttrap_add_probe(probe);
+err:
+		kmem_free(probe, size);
+
+		return (ret);
+
+	} else if (cmd == FASTTRAPIOC_GETINSTR) {
+		fasttrap_instr_query_t instr;
+		fasttrap_tracepoint_t *tp;
+		uint_t index;
+		int ret;
+
+		if (copyin((void *)arg, &instr, sizeof (instr)) != 0)
+			return (EFAULT);
+
+		if (!PRIV_POLICY_CHOICE(cr, PRIV_ALL, B_FALSE)) {
+			proc_t *p;
+			pid_t pid = instr.ftiq_pid;
+
+			mutex_enter(&pidlock);
+			/*
+			 * Report an error if the process doesn't exist
+			 * or is actively being birthed.
+			 */
+			if ((p = prfind(pid)) == NULL || p->p_stat == SIDL) {
+				mutex_exit(&pidlock);
+				return (ESRCH);
+			}
+			mutex_enter(&p->p_lock);
+			mutex_exit(&pidlock);
+
+			if ((ret = priv_proc_cred_perm(cr, p, NULL,
+			    VREAD)) != 0) {
+				mutex_exit(&p->p_lock);
+				return (ret);
+			}
+
+			mutex_exit(&p->p_lock);
+		}
+
+		index = FASTTRAP_TPOINTS_INDEX(instr.ftiq_pid, instr.ftiq_pc);
+
+		mutex_enter(&fasttrap_tpoints.fth_table[index].ftb_mtx);
+		tp = fasttrap_tpoints.fth_table[index].ftb_data;
+		while (tp != NULL) {
+			if (instr.ftiq_pid == tp->ftt_pid &&
+			    instr.ftiq_pc == tp->ftt_pc &&
+			    tp->ftt_proc->ftpc_acount != 0)
+				break;
+
+			tp = tp->ftt_next;
+		}
+
+		if (tp == NULL) {
+			mutex_exit(&fasttrap_tpoints.fth_table[index].ftb_mtx);
+			return (ENOENT);
+		}
+
+		bcopy(&tp->ftt_instr, &instr.ftiq_instr,
+		    sizeof (instr.ftiq_instr));
+		mutex_exit(&fasttrap_tpoints.fth_table[index].ftb_mtx);
+
+		if (copyout(&instr, (void *)arg, sizeof (instr)) != 0)
+			return (EFAULT);
+
+		return (0);
+	}
+
+	return (EINVAL);
+}
+
+static struct cb_ops fasttrap_cb_ops = {
+	fasttrap_open,		/* open */
+	nodev,			/* close */
+	nulldev,		/* strategy */
+	nulldev,		/* print */
+	nodev,			/* dump */
+	nodev,			/* read */
+	nodev,			/* write */
+	fasttrap_ioctl,		/* ioctl */
+	nodev,			/* devmap */
+	nodev,			/* mmap */
+	nodev,			/* segmap */
+	nochpoll,		/* poll */
+	ddi_prop_op,		/* cb_prop_op */
+	0,			/* streamtab  */
+	D_NEW | D_MP		/* Driver compatibility flag */
+};
+
+/*ARGSUSED*/
+static int
+fasttrap_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
+{
+	int error;
+
+	switch (infocmd) {
+	case DDI_INFO_DEVT2DEVINFO:
+		*result = (void *)fasttrap_devi;
+		error = DDI_SUCCESS;
+		break;
+	case DDI_INFO_DEVT2INSTANCE:
+		*result = (void *)0;
+		error = DDI_SUCCESS;
+		break;
+	default:
+		error = DDI_FAILURE;
+	}
+	return (error);
+}
+
+static int
+fasttrap_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
+{
+	ulong_t nent;
+
+	switch (cmd) {
+	case DDI_ATTACH:
+		break;
+	case DDI_RESUME:
+		return (DDI_SUCCESS);
+	default:
+		return (DDI_FAILURE);
+	}
+
+	if (ddi_create_minor_node(devi, "fasttrap", S_IFCHR, 0,
+	    DDI_PSEUDO, NULL) == DDI_FAILURE) {
+		ddi_remove_minor_node(devi, NULL);
+		return (DDI_FAILURE);
+	}
+
+	ddi_report_dev(devi);
+	fasttrap_devi = devi;
+
+	/*
+	 * Install our hooks into fork(2), exec(2), and exit(2).
+	 */
+	dtrace_fasttrap_fork_ptr = &fasttrap_fork;
+	dtrace_fasttrap_exit_ptr = &fasttrap_exec_exit;
+	dtrace_fasttrap_exec_ptr = &fasttrap_exec_exit;
+
+	fasttrap_max = ddi_getprop(DDI_DEV_T_ANY, devi, DDI_PROP_DONTPASS,
+	    "fasttrap-max-probes", FASTTRAP_MAX_DEFAULT);
+	fasttrap_total = 0;
+
+	/*
+	 * Conjure up the tracepoints hashtable...
+	 */
+	nent = ddi_getprop(DDI_DEV_T_ANY, devi, DDI_PROP_DONTPASS,
+	    "fasttrap-hash-size", FASTTRAP_TPOINTS_DEFAULT_SIZE);
+
+	if (nent == 0 || nent > 0x1000000)
+		nent = FASTTRAP_TPOINTS_DEFAULT_SIZE;
+
+	if ((nent & (nent - 1)) == 0)
+		fasttrap_tpoints.fth_nent = nent;
+	else
+		fasttrap_tpoints.fth_nent = 1 << fasttrap_highbit(nent);
+	ASSERT(fasttrap_tpoints.fth_nent > 0);
+	fasttrap_tpoints.fth_mask = fasttrap_tpoints.fth_nent - 1;
+	fasttrap_tpoints.fth_table = kmem_zalloc(fasttrap_tpoints.fth_nent *
+	    sizeof (fasttrap_bucket_t), KM_SLEEP);
+
+	/*
+	 * ... and the providers hash table...
+	 */
+	nent = FASTTRAP_PROVIDERS_DEFAULT_SIZE;
+	if ((nent & (nent - 1)) == 0)
+		fasttrap_provs.fth_nent = nent;
+	else
+		fasttrap_provs.fth_nent = 1 << fasttrap_highbit(nent);
+	ASSERT(fasttrap_provs.fth_nent > 0);
+	fasttrap_provs.fth_mask = fasttrap_provs.fth_nent - 1;
+	fasttrap_provs.fth_table = kmem_zalloc(fasttrap_provs.fth_nent *
+	    sizeof (fasttrap_bucket_t), KM_SLEEP);
+
+	/*
+	 * ... and the procs hash table.
+	 */
+	nent = FASTTRAP_PROCS_DEFAULT_SIZE;
+	if ((nent & (nent - 1)) == 0)
+		fasttrap_procs.fth_nent = nent;
+	else
+		fasttrap_procs.fth_nent = 1 << fasttrap_highbit(nent);
+	ASSERT(fasttrap_procs.fth_nent > 0);
+	fasttrap_procs.fth_mask = fasttrap_procs.fth_nent - 1;
+	fasttrap_procs.fth_table = kmem_zalloc(fasttrap_procs.fth_nent *
+	    sizeof (fasttrap_bucket_t), KM_SLEEP);
+
+	(void) dtrace_meta_register("fasttrap", &fasttrap_mops, NULL,
+	    &fasttrap_meta_id);
+
+	return (DDI_SUCCESS);
+}
+
+static int
+fasttrap_detach(dev_info_t *devi, ddi_detach_cmd_t cmd)
+{
+	int i, fail = 0;
+	timeout_id_t tmp;
+
+	switch (cmd) {
+	case DDI_DETACH:
+		break;
+	case DDI_SUSPEND:
+		return (DDI_SUCCESS);
+	default:
+		return (DDI_FAILURE);
+	}
+
+	/*
+	 * Unregister the meta-provider to make sure no new fasttrap-
+	 * managed providers come along while we're trying to close up
+	 * shop. If we fail to detach, we'll need to re-register as a
+	 * meta-provider. We can fail to unregister as a meta-provider
+	 * if providers we manage still exist.
+	 */
+	if (fasttrap_meta_id != DTRACE_METAPROVNONE &&
+	    dtrace_meta_unregister(fasttrap_meta_id) != 0)
+		return (DDI_FAILURE);
+
+	/*
+	 * Prevent any new timeouts from running by setting fasttrap_timeout
+	 * to a non-zero value, and wait for the current timeout to complete.
+	 */
+	mutex_enter(&fasttrap_cleanup_mtx);
+	fasttrap_cleanup_work = 0;
+
+	while (fasttrap_timeout != (timeout_id_t)1) {
+		tmp = fasttrap_timeout;
+		fasttrap_timeout = (timeout_id_t)1;
+
+		if (tmp != 0) {
+			mutex_exit(&fasttrap_cleanup_mtx);
+			(void) untimeout(tmp);
+			mutex_enter(&fasttrap_cleanup_mtx);
+		}
+	}
+
+	fasttrap_cleanup_work = 0;
+	mutex_exit(&fasttrap_cleanup_mtx);
+
+	/*
+	 * Iterate over all of our providers. If there's still a process
+	 * that corresponds to that pid, fail to detach.
+	 */
+	for (i = 0; i < fasttrap_provs.fth_nent; i++) {
+		fasttrap_provider_t **fpp, *fp;
+		fasttrap_bucket_t *bucket = &fasttrap_provs.fth_table[i];
+
+		mutex_enter(&bucket->ftb_mtx);
+		fpp = (fasttrap_provider_t **)&bucket->ftb_data;
+		while ((fp = *fpp) != NULL) {
+			/*
+			 * Acquire and release the lock as a simple way of
+			 * waiting for any other consumer to finish with
+			 * this provider. A thread must first acquire the
+			 * bucket lock so there's no chance of another thread
+			 * blocking on the provider's lock.
+			 */
+			mutex_enter(&fp->ftp_mtx);
+			mutex_exit(&fp->ftp_mtx);
+
+			if (dtrace_unregister(fp->ftp_provid) != 0) {
+				fail = 1;
+				fpp = &fp->ftp_next;
+			} else {
+				*fpp = fp->ftp_next;
+				fasttrap_provider_free(fp);
+			}
+		}
+
+		mutex_exit(&bucket->ftb_mtx);
+	}
+
+	if (fail) {
+		uint_t work;
+		/*
+		 * If we're failing to detach, we need to unblock timeouts
+		 * and start a new timeout if any work has accumulated while
+		 * we've been unsuccessfully trying to detach.
+		 */
+		mutex_enter(&fasttrap_cleanup_mtx);
+		fasttrap_timeout = 0;
+		work = fasttrap_cleanup_work;
+		mutex_exit(&fasttrap_cleanup_mtx);
+
+		if (work)
+			fasttrap_pid_cleanup();
+
+		(void) dtrace_meta_register("fasttrap", &fasttrap_mops, NULL,
+		    &fasttrap_meta_id);
+
+		return (DDI_FAILURE);
+	}
+
+#ifdef DEBUG
+	mutex_enter(&fasttrap_count_mtx);
+	ASSERT(fasttrap_pid_count == 0);
+	mutex_exit(&fasttrap_count_mtx);
+#endif
+
+	kmem_free(fasttrap_tpoints.fth_table,
+	    fasttrap_tpoints.fth_nent * sizeof (fasttrap_bucket_t));
+	fasttrap_tpoints.fth_nent = 0;
+
+	kmem_free(fasttrap_provs.fth_table,
+	    fasttrap_provs.fth_nent * sizeof (fasttrap_bucket_t));
+	fasttrap_provs.fth_nent = 0;
+
+	kmem_free(fasttrap_procs.fth_table,
+	    fasttrap_procs.fth_nent * sizeof (fasttrap_bucket_t));
+	fasttrap_procs.fth_nent = 0;
+
+	/*
+	 * We know there are no tracepoints in any process anywhere in
+	 * the system so there is no process which has its p_dtrace_count
+	 * greater than zero, therefore we know that no thread can actively
+	 * be executing code in fasttrap_fork(). Similarly for p_dtrace_probes
+	 * and fasttrap_exec() and fasttrap_exit().
+	 */
+	ASSERT(dtrace_fasttrap_fork_ptr == &fasttrap_fork);
+	dtrace_fasttrap_fork_ptr = NULL;
+
+	ASSERT(dtrace_fasttrap_exec_ptr == &fasttrap_exec_exit);
+	dtrace_fasttrap_exec_ptr = NULL;
+
+	ASSERT(dtrace_fasttrap_exit_ptr == &fasttrap_exec_exit);
+	dtrace_fasttrap_exit_ptr = NULL;
+
+	ddi_remove_minor_node(devi, NULL);
+
+	return (DDI_SUCCESS);
+}
+
+static struct dev_ops fasttrap_ops = {
+	DEVO_REV,		/* devo_rev */
+	0,			/* refcnt */
+	fasttrap_info,		/* get_dev_info */
+	nulldev,		/* identify */
+	nulldev,		/* probe */
+	fasttrap_attach,	/* attach */
+	fasttrap_detach,	/* detach */
+	nodev,			/* reset */
+	&fasttrap_cb_ops,	/* driver operations */
+	NULL,			/* bus operations */
+	nodev			/* dev power */
+};
+
+/*
+ * Module linkage information for the kernel.
+ */
+static struct modldrv modldrv = {
+	&mod_driverops,		/* module type (this is a pseudo driver) */
+	"Fasttrap Tracing",	/* name of module */
+	&fasttrap_ops,		/* driver ops */
+};
+
+static struct modlinkage modlinkage = {
+	MODREV_1,
+	(void *)&modldrv,
+	NULL
+};
+
+int
+_init(void)
+{
+	return (mod_install(&modlinkage));
+}
+
+int
+_info(struct modinfo *modinfop)
+{
+	return (mod_info(&modlinkage, modinfop));
+}
+
+int
+_fini(void)
+{
+	return (mod_remove(&modlinkage));
+}
diff --git a/cddl/contrib/opensolaris/uts/common/dtrace/lockstat.c b/cddl/contrib/opensolaris/uts/common/dtrace/lockstat.c
new file mode 100644
index 0000000..3eb76a0
--- /dev/null
+++ b/cddl/contrib/opensolaris/uts/common/dtrace/lockstat.c
@@ -0,0 +1,341 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <sys/open.h>
+#include <sys/file.h>
+#include <sys/conf.h>
+#include <sys/modctl.h>
+#include <sys/cmn_err.h>
+#include <sys/bitmap.h>
+#include <sys/debug.h>
+#include <sys/kmem.h>
+#include <sys/errno.h>
+#include <sys/sysmacros.h>
+#include <sys/lockstat.h>
+#include <sys/atomic.h>
+#include <sys/dtrace.h>
+
+#include <sys/ddi.h>
+#include <sys/sunddi.h>
+
+typedef struct lockstat_probe {
+	const char	*lsp_func;
+	const char	*lsp_name;
+	int		lsp_probe;
+	dtrace_id_t	lsp_id;
+} lockstat_probe_t;
+
+lockstat_probe_t lockstat_probes[] =
+{
+	{ LS_MUTEX_ENTER,	LSA_ACQUIRE,	LS_MUTEX_ENTER_ACQUIRE },
+	{ LS_MUTEX_ENTER,	LSA_BLOCK,	LS_MUTEX_ENTER_BLOCK },
+	{ LS_MUTEX_ENTER,	LSA_SPIN,	LS_MUTEX_ENTER_SPIN },
+	{ LS_MUTEX_EXIT,	LSA_RELEASE,	LS_MUTEX_EXIT_RELEASE },
+	{ LS_MUTEX_DESTROY,	LSA_RELEASE,	LS_MUTEX_DESTROY_RELEASE },
+	{ LS_MUTEX_TRYENTER,	LSA_ACQUIRE,	LS_MUTEX_TRYENTER_ACQUIRE },
+	{ LS_LOCK_SET,		LSS_ACQUIRE,	LS_LOCK_SET_ACQUIRE },
+	{ LS_LOCK_SET,		LSS_SPIN,	LS_LOCK_SET_SPIN },
+	{ LS_LOCK_SET_SPL,	LSS_ACQUIRE,	LS_LOCK_SET_SPL_ACQUIRE },
+	{ LS_LOCK_SET_SPL,	LSS_SPIN,	LS_LOCK_SET_SPL_SPIN },
+	{ LS_LOCK_TRY,		LSS_ACQUIRE,	LS_LOCK_TRY_ACQUIRE },
+	{ LS_LOCK_CLEAR,	LSS_RELEASE,	LS_LOCK_CLEAR_RELEASE },
+	{ LS_LOCK_CLEAR_SPLX,	LSS_RELEASE,	LS_LOCK_CLEAR_SPLX_RELEASE },
+	{ LS_CLOCK_UNLOCK,	LSS_RELEASE,	LS_CLOCK_UNLOCK_RELEASE },
+	{ LS_RW_ENTER,		LSR_ACQUIRE,	LS_RW_ENTER_ACQUIRE },
+	{ LS_RW_ENTER,		LSR_BLOCK,	LS_RW_ENTER_BLOCK },
+	{ LS_RW_EXIT,		LSR_RELEASE,	LS_RW_EXIT_RELEASE },
+	{ LS_RW_TRYENTER,	LSR_ACQUIRE,	LS_RW_TRYENTER_ACQUIRE },
+	{ LS_RW_TRYUPGRADE,	LSR_UPGRADE,	LS_RW_TRYUPGRADE_UPGRADE },
+	{ LS_RW_DOWNGRADE,	LSR_DOWNGRADE,	LS_RW_DOWNGRADE_DOWNGRADE },
+	{ LS_THREAD_LOCK,	LST_SPIN,	LS_THREAD_LOCK_SPIN },
+	{ LS_THREAD_LOCK_HIGH,	LST_SPIN,	LS_THREAD_LOCK_HIGH_SPIN },
+	{ NULL }
+};
+
+static dev_info_t	*lockstat_devi;	/* saved in xxattach() for xxinfo() */
+static kmutex_t		lockstat_test;	/* for testing purposes only */
+static dtrace_provider_id_t lockstat_id;
+
+/*ARGSUSED*/
+static void
+lockstat_enable(void *arg, dtrace_id_t id, void *parg)
+{
+	lockstat_probe_t *probe = parg;
+
+	ASSERT(!lockstat_probemap[probe->lsp_probe]);
+
+	lockstat_probemap[probe->lsp_probe] = id;
+	membar_producer();
+
+	lockstat_hot_patch();
+	membar_producer();
+
+	/*
+	 * Immediately generate a record for the lockstat_test mutex
+	 * to verify that the mutex hot-patch code worked as expected.
+	 */
+	mutex_enter(&lockstat_test);
+	mutex_exit(&lockstat_test);
+}
+
+/*ARGSUSED*/
+static void
+lockstat_disable(void *arg, dtrace_id_t id, void *parg)
+{
+	lockstat_probe_t *probe = parg;
+	int i;
+
+	ASSERT(lockstat_probemap[probe->lsp_probe]);
+
+	lockstat_probemap[probe->lsp_probe] = 0;
+	lockstat_hot_patch();
+	membar_producer();
+
+	/*
+	 * See if we have any probes left enabled.
+	 */
+	for (i = 0; i < LS_NPROBES; i++) {
+		if (lockstat_probemap[i]) {
+			/*
+			 * This probe is still enabled.  We don't need to deal
+			 * with waiting for all threads to be out of the
+			 * lockstat critical sections; just return.
+			 */
+			return;
+		}
+	}
+
+	/*
+	 * The delay() here isn't as cheesy as you might think.  We don't
+	 * want to busy-loop in the kernel, so we have to give up the
+	 * CPU between calls to lockstat_active_threads(); that much is
+	 * obvious.  But the reason it's a do..while loop rather than a
+	 * while loop is subtle.  The memory barrier above guarantees that
+	 * no threads will enter the lockstat code from this point forward.
+	 * However, another thread could already be executing lockstat code
+	 * without our knowledge if the update to its t_lockstat field hasn't
+	 * cleared its CPU's store buffer.  Delaying for one clock tick
+	 * guarantees that either (1) the thread will have *ample* time to
+	 * complete its work, or (2) the thread will be preempted, in which
+	 * case it will have to grab and release a dispatcher lock, which
+	 * will flush that CPU's store buffer.  Either way we're covered.
+	 */
+	do {
+		delay(1);
+	} while (lockstat_active_threads());
+}
+
+/*ARGSUSED*/
+static int
+lockstat_open(dev_t *devp, int flag, int otyp, cred_t *cred_p)
+{
+	return (0);
+}
+
+/* ARGSUSED */
+static int
+lockstat_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
+{
+	int error;
+
+	switch (infocmd) {
+	case DDI_INFO_DEVT2DEVINFO:
+		*result = (void *) lockstat_devi;
+		error = DDI_SUCCESS;
+		break;
+	case DDI_INFO_DEVT2INSTANCE:
+		*result = (void *)0;
+		error = DDI_SUCCESS;
+		break;
+	default:
+		error = DDI_FAILURE;
+	}
+	return (error);
+}
+
+/*ARGSUSED*/
+static void
+lockstat_provide(void *arg, const dtrace_probedesc_t *desc)
+{
+	int i = 0;
+
+	for (i = 0; lockstat_probes[i].lsp_func != NULL; i++) {
+		lockstat_probe_t *probe = &lockstat_probes[i];
+
+		if (dtrace_probe_lookup(lockstat_id, "genunix",
+		    probe->lsp_func, probe->lsp_name) != 0)
+			continue;
+
+		ASSERT(!probe->lsp_id);
+		probe->lsp_id = dtrace_probe_create(lockstat_id,
+		    "genunix", probe->lsp_func, probe->lsp_name,
+		    1, probe);
+	}
+}
+
+/*ARGSUSED*/
+static void
+lockstat_destroy(void *arg, dtrace_id_t id, void *parg)
+{
+	lockstat_probe_t *probe = parg;
+
+	ASSERT(!lockstat_probemap[probe->lsp_probe]);
+	probe->lsp_id = 0;
+}
+
+static dtrace_pattr_t lockstat_attr = {
+{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
+{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
+};
+
+static dtrace_pops_t lockstat_pops = {
+	lockstat_provide,
+	NULL,
+	lockstat_enable,
+	lockstat_disable,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	lockstat_destroy
+};
+
+static int
+lockstat_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
+{
+	switch (cmd) {
+	case DDI_ATTACH:
+		break;
+	case DDI_RESUME:
+		return (DDI_SUCCESS);
+	default:
+		return (DDI_FAILURE);
+	}
+
+	if (ddi_create_minor_node(devi, "lockstat", S_IFCHR, 0,
+	    DDI_PSEUDO, 0) == DDI_FAILURE ||
+	    dtrace_register("lockstat", &lockstat_attr, DTRACE_PRIV_KERNEL,
+	    NULL, &lockstat_pops, NULL, &lockstat_id) != 0) {
+		ddi_remove_minor_node(devi, NULL);
+		return (DDI_FAILURE);
+	}
+
+	lockstat_probe = dtrace_probe;
+	membar_producer();
+
+	ddi_report_dev(devi);
+	lockstat_devi = devi;
+	return (DDI_SUCCESS);
+}
+
+static int
+lockstat_detach(dev_info_t *devi, ddi_detach_cmd_t cmd)
+{
+	switch (cmd) {
+	case DDI_DETACH:
+		break;
+	case DDI_SUSPEND:
+		return (DDI_SUCCESS);
+	default:
+		return (DDI_FAILURE);
+	}
+
+	if (dtrace_unregister(lockstat_id) != 0)
+		return (DDI_FAILURE);
+
+	ddi_remove_minor_node(devi, NULL);
+	return (DDI_SUCCESS);
+}
+
+/*
+ * Configuration data structures
+ */
+static struct cb_ops lockstat_cb_ops = {
+	lockstat_open,		/* open */
+	nodev,			/* close */
+	nulldev,		/* strategy */
+	nulldev,		/* print */
+	nodev,			/* dump */
+	nodev,			/* read */
+	nodev,			/* write */
+	nodev,			/* ioctl */
+	nodev,			/* devmap */
+	nodev,			/* mmap */
+	nodev,			/* segmap */
+	nochpoll,		/* poll */
+	ddi_prop_op,		/* cb_prop_op */
+	0,			/* streamtab */
+	D_MP | D_NEW		/* Driver compatibility flag */
+};
+
+static struct dev_ops lockstat_ops = {
+	DEVO_REV,		/* devo_rev, */
+	0,			/* refcnt */
+	lockstat_info,		/* getinfo */
+	nulldev,		/* identify */
+	nulldev,		/* probe */
+	lockstat_attach,	/* attach */
+	lockstat_detach,	/* detach */
+	nulldev,		/* reset */
+	&lockstat_cb_ops,	/* cb_ops */
+	NULL,			/* bus_ops */
+};
+
+static struct modldrv modldrv = {
+	&mod_driverops,		/* Type of module.  This one is a driver */
+	"Lock Statistics %I%",	/* name of module */
+	&lockstat_ops,		/* driver ops */
+};
+
+static struct modlinkage modlinkage = {
+	MODREV_1, (void *)&modldrv, NULL
+};
+
+int
+_init(void)
+{
+	return (mod_install(&modlinkage));
+}
+
+int
+_fini(void)
+{
+	return (mod_remove(&modlinkage));
+}
+
+int
+_info(struct modinfo *modinfop)
+{
+	return (mod_info(&modlinkage, modinfop));
+}
diff --git a/cddl/contrib/opensolaris/uts/common/dtrace/profile.c b/cddl/contrib/opensolaris/uts/common/dtrace/profile.c
new file mode 100644
index 0000000..8de919a
--- /dev/null
+++ b/cddl/contrib/opensolaris/uts/common/dtrace/profile.c
@@ -0,0 +1,576 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <sys/errno.h>
+#include <sys/stat.h>
+#include <sys/modctl.h>
+#include <sys/conf.h>
+#include <sys/systm.h>
+#include <sys/ddi.h>
+#include <sys/sunddi.h>
+#include <sys/cpuvar.h>
+#include <sys/kmem.h>
+#include <sys/strsubr.h>
+#include <sys/dtrace.h>
+#include <sys/cyclic.h>
+#include <sys/atomic.h>
+
+static dev_info_t *profile_devi;
+static dtrace_provider_id_t profile_id;
+
+/*
+ * Regardless of platform, the stack frames look like this in the case of the
+ * profile provider:
+ *
+ *	profile_fire
+ *	cyclic_expire
+ *	cyclic_fire
+ *	[ cbe ]
+ *	[ interrupt code ]
+ *
+ * On x86, there are five frames from the generic interrupt code; further, the
+ * interrupted instruction appears as its own stack frame, giving us a total of
+ * 10.
+ *
+ * On SPARC, the picture is further complicated because the compiler
+ * optimizes away tail-calls -- so the following frames are optimized away:
+ *
+ * 	profile_fire
+ *	cyclic_expire
+ *
+ * This gives three frames.  However, on DEBUG kernels, the cyclic_expire
+ * frame cannot be tail-call eliminated, yielding four frames in this case.
+ *
+ * All of the above constraints lead to the mess below.  Yes, the profile
+ * provider should ideally figure this out on-the-fly by hitting one of its own
+ * probes and then walking its own stack trace.  This is complicated, however,
+ * and the static definition doesn't seem to be overly brittle.  Still, we
+ * allow for a manual override in case we get it completely wrong.
+ */
+#ifdef __x86
+#define	PROF_ARTIFICIAL_FRAMES	10
+#else
+#ifdef __sparc
+#ifdef DEBUG
+#define	PROF_ARTIFICIAL_FRAMES	4
+#else
+#define	PROF_ARTIFICIAL_FRAMES	3
+#endif
+#endif
+#endif
+
+#define	PROF_NAMELEN		15
+
+#define	PROF_PROFILE		0
+#define	PROF_TICK		1
+#define	PROF_PREFIX_PROFILE	"profile-"
+#define	PROF_PREFIX_TICK	"tick-"
+
+typedef struct profile_probe {
+	char		prof_name[PROF_NAMELEN];
+	dtrace_id_t	prof_id;
+	int		prof_kind;
+	hrtime_t	prof_interval;
+	cyclic_id_t	prof_cyclic;
+} profile_probe_t;
+
+typedef struct profile_probe_percpu {
+	hrtime_t	profc_expected;
+	hrtime_t	profc_interval;
+	profile_probe_t	*profc_probe;
+} profile_probe_percpu_t;
+
+hrtime_t	profile_interval_min = NANOSEC / 5000;		/* 5000 hz */
+int		profile_aframes = 0;				/* override */
+
+static int profile_rates[] = {
+    97, 199, 499, 997, 1999,
+    4001, 4999, 0, 0, 0,
+    0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0
+};
+
+static int profile_ticks[] = {
+    1, 10, 100, 500, 1000,
+    5000, 0, 0, 0, 0,
+    0, 0, 0, 0, 0
+};
+
+/*
+ * profile_max defines the upper bound on the number of profile probes that
+ * can exist (this is to prevent malicious or clumsy users from exhausing
+ * system resources by creating a slew of profile probes). At mod load time,
+ * this gets its value from PROFILE_MAX_DEFAULT or profile-max-probes if it's
+ * present in the profile.conf file.
+ */
+#define	PROFILE_MAX_DEFAULT	1000	/* default max. number of probes */
+static uint32_t profile_max;		/* maximum number of profile probes */
+static uint32_t profile_total;	/* current number of profile probes */
+
+static void
+profile_fire(void *arg)
+{
+	profile_probe_percpu_t *pcpu = arg;
+	profile_probe_t *prof = pcpu->profc_probe;
+	hrtime_t late;
+
+	late = dtrace_gethrtime() - pcpu->profc_expected;
+	pcpu->profc_expected += pcpu->profc_interval;
+
+	dtrace_probe(prof->prof_id, CPU->cpu_profile_pc,
+	    CPU->cpu_profile_upc, late, 0, 0);
+}
+
+static void
+profile_tick(void *arg)
+{
+	profile_probe_t *prof = arg;
+
+	dtrace_probe(prof->prof_id, CPU->cpu_profile_pc,
+	    CPU->cpu_profile_upc, 0, 0, 0);
+}
+
+static void
+profile_create(hrtime_t interval, const char *name, int kind)
+{
+	profile_probe_t *prof;
+	int nr_frames = PROF_ARTIFICIAL_FRAMES + dtrace_mach_aframes();
+
+	if (profile_aframes)
+		nr_frames = profile_aframes;
+
+	if (interval < profile_interval_min)
+		return;
+
+	if (dtrace_probe_lookup(profile_id, NULL, NULL, name) != 0)
+		return;
+
+	atomic_add_32(&profile_total, 1);
+	if (profile_total > profile_max) {
+		atomic_add_32(&profile_total, -1);
+		return;
+	}
+
+	prof = kmem_zalloc(sizeof (profile_probe_t), KM_SLEEP);
+	(void) strcpy(prof->prof_name, name);
+	prof->prof_interval = interval;
+	prof->prof_cyclic = CYCLIC_NONE;
+	prof->prof_kind = kind;
+	prof->prof_id = dtrace_probe_create(profile_id,
+	    NULL, NULL, name, nr_frames, prof);
+}
+
+/*ARGSUSED*/
+static void
+profile_provide(void *arg, const dtrace_probedesc_t *desc)
+{
+	int i, j, rate, kind;
+	hrtime_t val = 0, mult = 1, len;
+	const char *name, *suffix = NULL;
+
+	const struct {
+		char *prefix;
+		int kind;
+	} types[] = {
+		{ PROF_PREFIX_PROFILE, PROF_PROFILE },
+		{ PROF_PREFIX_TICK, PROF_TICK },
+		{ NULL, NULL }
+	};
+
+	const struct {
+		char *name;
+		hrtime_t mult;
+	} suffixes[] = {
+		{ "ns", 	NANOSEC / NANOSEC },
+		{ "nsec",	NANOSEC / NANOSEC },
+		{ "us",		NANOSEC / MICROSEC },
+		{ "usec",	NANOSEC / MICROSEC },
+		{ "ms",		NANOSEC / MILLISEC },
+		{ "msec",	NANOSEC / MILLISEC },
+		{ "s",		NANOSEC / SEC },
+		{ "sec",	NANOSEC / SEC },
+		{ "m",		NANOSEC * (hrtime_t)60 },
+		{ "min",	NANOSEC * (hrtime_t)60 },
+		{ "h",		NANOSEC * (hrtime_t)(60 * 60) },
+		{ "hour",	NANOSEC * (hrtime_t)(60 * 60) },
+		{ "d",		NANOSEC * (hrtime_t)(24 * 60 * 60) },
+		{ "day",	NANOSEC * (hrtime_t)(24 * 60 * 60) },
+		{ "hz",		0 },
+		{ NULL }
+	};
+
+	if (desc == NULL) {
+		char n[PROF_NAMELEN];
+
+		/*
+		 * If no description was provided, provide all of our probes.
+		 */
+		for (i = 0; i < sizeof (profile_rates) / sizeof (int); i++) {
+			if ((rate = profile_rates[i]) == 0)
+				continue;
+
+			(void) snprintf(n, PROF_NAMELEN, "%s%d",
+			    PROF_PREFIX_PROFILE, rate);
+			profile_create(NANOSEC / rate, n, PROF_PROFILE);
+		}
+
+		for (i = 0; i < sizeof (profile_ticks) / sizeof (int); i++) {
+			if ((rate = profile_ticks[i]) == 0)
+				continue;
+
+			(void) snprintf(n, PROF_NAMELEN, "%s%d",
+			    PROF_PREFIX_TICK, rate);
+			profile_create(NANOSEC / rate, n, PROF_TICK);
+		}
+
+		return;
+	}
+
+	name = desc->dtpd_name;
+
+	for (i = 0; types[i].prefix != NULL; i++) {
+		len = strlen(types[i].prefix);
+
+		if (strncmp(name, types[i].prefix, len) != 0)
+			continue;
+		break;
+	}
+
+	if (types[i].prefix == NULL)
+		return;
+
+	kind = types[i].kind;
+	j = strlen(name) - len;
+
+	/*
+	 * We need to start before any time suffix.
+	 */
+	for (j = strlen(name); j >= len; j--) {
+		if (name[j] >= '0' && name[j] <= '9')
+			break;
+		suffix = &name[j];
+	}
+
+	ASSERT(suffix != NULL);
+
+	/*
+	 * Now determine the numerical value present in the probe name.
+	 */
+	for (; j >= len; j--) {
+		if (name[j] < '0' || name[j] > '9')
+			return;
+
+		val += (name[j] - '0') * mult;
+		mult *= (hrtime_t)10;
+	}
+
+	if (val == 0)
+		return;
+
+	/*
+	 * Look-up the suffix to determine the multiplier.
+	 */
+	for (i = 0, mult = 0; suffixes[i].name != NULL; i++) {
+		if (strcasecmp(suffixes[i].name, suffix) == 0) {
+			mult = suffixes[i].mult;
+			break;
+		}
+	}
+
+	if (suffixes[i].name == NULL && *suffix != '\0')
+		return;
+
+	if (mult == 0) {
+		/*
+		 * The default is frequency-per-second.
+		 */
+		val = NANOSEC / val;
+	} else {
+		val *= mult;
+	}
+
+	profile_create(val, name, kind);
+}
+
+/*ARGSUSED*/
+static void
+profile_destroy(void *arg, dtrace_id_t id, void *parg)
+{
+	profile_probe_t *prof = parg;
+
+	ASSERT(prof->prof_cyclic == CYCLIC_NONE);
+	kmem_free(prof, sizeof (profile_probe_t));
+
+	ASSERT(profile_total >= 1);
+	atomic_add_32(&profile_total, -1);
+}
+
+/*ARGSUSED*/
+static void
+profile_online(void *arg, cpu_t *cpu, cyc_handler_t *hdlr, cyc_time_t *when)
+{
+	profile_probe_t *prof = arg;
+	profile_probe_percpu_t *pcpu;
+
+	pcpu = kmem_zalloc(sizeof (profile_probe_percpu_t), KM_SLEEP);
+	pcpu->profc_probe = prof;
+
+	hdlr->cyh_func = profile_fire;
+	hdlr->cyh_arg = pcpu;
+	hdlr->cyh_level = CY_HIGH_LEVEL;
+
+	when->cyt_interval = prof->prof_interval;
+	when->cyt_when = dtrace_gethrtime() + when->cyt_interval;
+
+	pcpu->profc_expected = when->cyt_when;
+	pcpu->profc_interval = when->cyt_interval;
+}
+
+/*ARGSUSED*/
+static void
+profile_offline(void *arg, cpu_t *cpu, void *oarg)
+{
+	profile_probe_percpu_t *pcpu = oarg;
+
+	ASSERT(pcpu->profc_probe == arg);
+	kmem_free(pcpu, sizeof (profile_probe_percpu_t));
+}
+
+/*ARGSUSED*/
+static void
+profile_enable(void *arg, dtrace_id_t id, void *parg)
+{
+	profile_probe_t *prof = parg;
+	cyc_omni_handler_t omni;
+	cyc_handler_t hdlr;
+	cyc_time_t when;
+
+	ASSERT(prof->prof_interval != 0);
+	ASSERT(MUTEX_HELD(&cpu_lock));
+
+	if (prof->prof_kind == PROF_TICK) {
+		hdlr.cyh_func = profile_tick;
+		hdlr.cyh_arg = prof;
+		hdlr.cyh_level = CY_HIGH_LEVEL;
+
+		when.cyt_interval = prof->prof_interval;
+		when.cyt_when = dtrace_gethrtime() + when.cyt_interval;
+	} else {
+		ASSERT(prof->prof_kind == PROF_PROFILE);
+		omni.cyo_online = profile_online;
+		omni.cyo_offline = profile_offline;
+		omni.cyo_arg = prof;
+	}
+
+	if (prof->prof_kind == PROF_TICK) {
+		prof->prof_cyclic = cyclic_add(&hdlr, &when);
+	} else {
+		prof->prof_cyclic = cyclic_add_omni(&omni);
+	}
+}
+
+/*ARGSUSED*/
+static void
+profile_disable(void *arg, dtrace_id_t id, void *parg)
+{
+	profile_probe_t *prof = parg;
+
+	ASSERT(prof->prof_cyclic != CYCLIC_NONE);
+	ASSERT(MUTEX_HELD(&cpu_lock));
+
+	cyclic_remove(prof->prof_cyclic);
+	prof->prof_cyclic = CYCLIC_NONE;
+}
+
+/*ARGSUSED*/
+static int
+profile_usermode(void *arg, dtrace_id_t id, void *parg)
+{
+	return (CPU->cpu_profile_pc == 0);
+}
+
+static dtrace_pattr_t profile_attr = {
+{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
+{ DTRACE_STABILITY_UNSTABLE, DTRACE_STABILITY_UNSTABLE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
+{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
+};
+
+static dtrace_pops_t profile_pops = {
+	profile_provide,
+	NULL,
+	profile_enable,
+	profile_disable,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	profile_usermode,
+	profile_destroy
+};
+
+static int
+profile_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
+{
+	switch (cmd) {
+	case DDI_ATTACH:
+		break;
+	case DDI_RESUME:
+		return (DDI_SUCCESS);
+	default:
+		return (DDI_FAILURE);
+	}
+
+	if (ddi_create_minor_node(devi, "profile", S_IFCHR, 0,
+	    DDI_PSEUDO, NULL) == DDI_FAILURE ||
+	    dtrace_register("profile", &profile_attr,
+	    DTRACE_PRIV_KERNEL | DTRACE_PRIV_USER, NULL,
+	    &profile_pops, NULL, &profile_id) != 0) {
+		ddi_remove_minor_node(devi, NULL);
+		return (DDI_FAILURE);
+	}
+
+	profile_max = ddi_getprop(DDI_DEV_T_ANY, devi, DDI_PROP_DONTPASS,
+	    "profile-max-probes", PROFILE_MAX_DEFAULT);
+
+	ddi_report_dev(devi);
+	profile_devi = devi;
+	return (DDI_SUCCESS);
+}
+
+static int
+profile_detach(dev_info_t *devi, ddi_detach_cmd_t cmd)
+{
+	switch (cmd) {
+	case DDI_DETACH:
+		break;
+	case DDI_SUSPEND:
+		return (DDI_SUCCESS);
+	default:
+		return (DDI_FAILURE);
+	}
+
+	if (dtrace_unregister(profile_id) != 0)
+		return (DDI_FAILURE);
+
+	ddi_remove_minor_node(devi, NULL);
+	return (DDI_SUCCESS);
+}
+
+/*ARGSUSED*/
+static int
+profile_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
+{
+	int error;
+
+	switch (infocmd) {
+	case DDI_INFO_DEVT2DEVINFO:
+		*result = (void *)profile_devi;
+		error = DDI_SUCCESS;
+		break;
+	case DDI_INFO_DEVT2INSTANCE:
+		*result = (void *)0;
+		error = DDI_SUCCESS;
+		break;
+	default:
+		error = DDI_FAILURE;
+	}
+	return (error);
+}
+
+/*ARGSUSED*/
+static int
+profile_open(dev_t *devp, int flag, int otyp, cred_t *cred_p)
+{
+	return (0);
+}
+
+static struct cb_ops profile_cb_ops = {
+	profile_open,		/* open */
+	nodev,			/* close */
+	nulldev,		/* strategy */
+	nulldev,		/* print */
+	nodev,			/* dump */
+	nodev,			/* read */
+	nodev,			/* write */
+	nodev,			/* ioctl */
+	nodev,			/* devmap */
+	nodev,			/* mmap */
+	nodev,			/* segmap */
+	nochpoll,		/* poll */
+	ddi_prop_op,		/* cb_prop_op */
+	0,			/* streamtab  */
+	D_NEW | D_MP		/* Driver compatibility flag */
+};
+
+static struct dev_ops profile_ops = {
+	DEVO_REV,		/* devo_rev, */
+	0,			/* refcnt  */
+	profile_info,		/* get_dev_info */
+	nulldev,		/* identify */
+	nulldev,		/* probe */
+	profile_attach,		/* attach */
+	profile_detach,		/* detach */
+	nodev,			/* reset */
+	&profile_cb_ops,	/* driver operations */
+	NULL,			/* bus operations */
+	nodev			/* dev power */
+};
+
+/*
+ * Module linkage information for the kernel.
+ */
+static struct modldrv modldrv = {
+	&mod_driverops,		/* module type (this is a pseudo driver) */
+	"Profile Interrupt Tracing",	/* name of module */
+	&profile_ops,		/* driver ops */
+};
+
+static struct modlinkage modlinkage = {
+	MODREV_1,
+	(void *)&modldrv,
+	NULL
+};
+
+int
+_init(void)
+{
+	return (mod_install(&modlinkage));
+}
+
+int
+_info(struct modinfo *modinfop)
+{
+	return (mod_info(&modlinkage, modinfop));
+}
+
+int
+_fini(void)
+{
+	return (mod_remove(&modlinkage));
+}
diff --git a/cddl/contrib/opensolaris/uts/common/dtrace/sdt_subr.c b/cddl/contrib/opensolaris/uts/common/dtrace/sdt_subr.c
new file mode 100644
index 0000000..66ff8a9
--- /dev/null
+++ b/cddl/contrib/opensolaris/uts/common/dtrace/sdt_subr.c
@@ -0,0 +1,888 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <sys/sdt_impl.h>
+
+static dtrace_pattr_t vtrace_attr = {
+{ DTRACE_STABILITY_UNSTABLE, DTRACE_STABILITY_UNSTABLE, DTRACE_CLASS_ISA },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_UNSTABLE, DTRACE_STABILITY_UNSTABLE, DTRACE_CLASS_ISA },
+};
+
+static dtrace_pattr_t info_attr = {
+{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_ISA },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_ISA },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
+};
+
+static dtrace_pattr_t fpu_attr = {
+{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_ISA },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_CPU },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
+};
+
+static dtrace_pattr_t fsinfo_attr = {
+{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_ISA },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_ISA },
+};
+
+static dtrace_pattr_t stab_attr = {
+{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_ISA },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_ISA },
+{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_ISA },
+};
+
+static dtrace_pattr_t sdt_attr = {
+{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_ISA },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
+};
+
+static dtrace_pattr_t xpv_attr = {
+{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_PLATFORM },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_PLATFORM },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_PLATFORM },
+};
+
+sdt_provider_t sdt_providers[] = {
+	{ "vtrace", "__vtrace_", &vtrace_attr, 0 },
+	{ "sysinfo", "__cpu_sysinfo_", &info_attr, 0 },
+	{ "vminfo", "__cpu_vminfo_", &info_attr, 0 },
+	{ "fpuinfo", "__fpuinfo_", &fpu_attr, 0 },
+	{ "sched", "__sched_", &stab_attr, 0 },
+	{ "proc", "__proc_", &stab_attr, 0 },
+	{ "io", "__io_", &stab_attr, 0 },
+	{ "mib", "__mib_", &stab_attr, 0 },
+	{ "fsinfo", "__fsinfo_", &fsinfo_attr, 0 },
+	{ "nfsv3", "__nfsv3_", &stab_attr, 0 },
+	{ "nfsv4", "__nfsv4_", &stab_attr, 0 },
+	{ "xpv", "__xpv_", &xpv_attr, 0 },
+	{ "sysevent", "__sysevent_", &stab_attr, 0 },
+	{ "sdt", NULL, &sdt_attr, 0 },
+	{ NULL }
+};
+
+sdt_argdesc_t sdt_args[] = {
+	{ "sched", "wakeup", 0, 0, "kthread_t *", "lwpsinfo_t *" },
+	{ "sched", "wakeup", 1, 0, "kthread_t *", "psinfo_t *" },
+	{ "sched", "dequeue", 0, 0, "kthread_t *", "lwpsinfo_t *" },
+	{ "sched", "dequeue", 1, 0, "kthread_t *", "psinfo_t *" },
+	{ "sched", "dequeue", 2, 1, "disp_t *", "cpuinfo_t *" },
+	{ "sched", "enqueue", 0, 0, "kthread_t *", "lwpsinfo_t *" },
+	{ "sched", "enqueue", 1, 0, "kthread_t *", "psinfo_t *" },
+	{ "sched", "enqueue", 2, 1, "disp_t *", "cpuinfo_t *" },
+	{ "sched", "enqueue", 3, 2, "int" },
+	{ "sched", "off-cpu", 0, 0, "kthread_t *", "lwpsinfo_t *" },
+	{ "sched", "off-cpu", 1, 0, "kthread_t *", "psinfo_t *" },
+	{ "sched", "tick", 0, 0, "kthread_t *", "lwpsinfo_t *" },
+	{ "sched", "tick", 1, 0, "kthread_t *", "psinfo_t *" },
+	{ "sched", "change-pri", 0, 0, "kthread_t *", "lwpsinfo_t *" },
+	{ "sched", "change-pri", 1, 0, "kthread_t *", "psinfo_t *" },
+	{ "sched", "change-pri", 2, 1, "pri_t" },
+	{ "sched", "schedctl-nopreempt", 0, 0, "kthread_t *", "lwpsinfo_t *" },
+	{ "sched", "schedctl-nopreempt", 1, 0, "kthread_t *", "psinfo_t *" },
+	{ "sched", "schedctl-nopreempt", 2, 1, "int" },
+	{ "sched", "schedctl-preempt", 0, 0, "kthread_t *", "lwpsinfo_t *" },
+	{ "sched", "schedctl-preempt", 1, 0, "kthread_t *", "psinfo_t *" },
+	{ "sched", "schedctl-yield", 0, 0, "int" },
+	{ "sched", "surrender", 0, 0, "kthread_t *", "lwpsinfo_t *" },
+	{ "sched", "surrender", 1, 0, "kthread_t *", "psinfo_t *" },
+	{ "sched", "cpucaps-sleep", 0, 0, "kthread_t *", "lwpsinfo_t *" },
+	{ "sched", "cpucaps-sleep", 1, 0, "kthread_t *", "psinfo_t *" },
+	{ "sched", "cpucaps-wakeup", 0, 0, "kthread_t *", "lwpsinfo_t *" },
+	{ "sched", "cpucaps-wakeup", 1, 0, "kthread_t *", "psinfo_t *" },
+
+	{ "proc", "create", 0, 0, "proc_t *", "psinfo_t *" },
+	{ "proc", "exec", 0, 0, "string" },
+	{ "proc", "exec-failure", 0, 0, "int" },
+	{ "proc", "exit", 0, 0, "int" },
+	{ "proc", "fault", 0, 0, "int" },
+	{ "proc", "fault", 1, 1, "siginfo_t *" },
+	{ "proc", "lwp-create", 0, 0, "kthread_t *", "lwpsinfo_t *" },
+	{ "proc", "lwp-create", 1, 0, "kthread_t *", "psinfo_t *" },
+	{ "proc", "signal-clear", 0, 0, "int" },
+	{ "proc", "signal-clear", 1, 1, "siginfo_t *" },
+	{ "proc", "signal-discard", 0, 0, "kthread_t *", "lwpsinfo_t *" },
+	{ "proc", "signal-discard", 1, 1, "proc_t *", "psinfo_t *" },
+	{ "proc", "signal-discard", 2, 2, "int" },
+	{ "proc", "signal-handle", 0, 0, "int" },
+	{ "proc", "signal-handle", 1, 1, "siginfo_t *" },
+	{ "proc", "signal-handle", 2, 2, "void (*)(void)" },
+	{ "proc", "signal-send", 0, 0, "kthread_t *", "lwpsinfo_t *" },
+	{ "proc", "signal-send", 1, 0, "kthread_t *", "psinfo_t *" },
+	{ "proc", "signal-send", 2, 1, "int" },
+
+	{ "io", "start", 0, 0, "buf_t *", "bufinfo_t *" },
+	{ "io", "start", 1, 0, "buf_t *", "devinfo_t *" },
+	{ "io", "start", 2, 0, "buf_t *", "fileinfo_t *" },
+	{ "io", "done", 0, 0, "buf_t *", "bufinfo_t *" },
+	{ "io", "done", 1, 0, "buf_t *", "devinfo_t *" },
+	{ "io", "done", 2, 0, "buf_t *", "fileinfo_t *" },
+	{ "io", "wait-start", 0, 0, "buf_t *", "bufinfo_t *" },
+	{ "io", "wait-start", 1, 0, "buf_t *", "devinfo_t *" },
+	{ "io", "wait-start", 2, 0, "buf_t *", "fileinfo_t *" },
+	{ "io", "wait-done", 0, 0, "buf_t *", "bufinfo_t *" },
+	{ "io", "wait-done", 1, 0, "buf_t *", "devinfo_t *" },
+	{ "io", "wait-done", 2, 0, "buf_t *", "fileinfo_t *" },
+
+	{ "mib", NULL, 0, 0, "int" },
+
+	{ "fsinfo", NULL, 0, 0, "vnode_t *", "fileinfo_t *" },
+	{ "fsinfo", NULL, 1, 1, "int", "int" },
+
+	{ "nfsv3", "op-getattr-start", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-getattr-start", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-getattr-start", 2, 3, "GETATTR3args *" },
+	{ "nfsv3", "op-getattr-done", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-getattr-done", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-getattr-done", 2, 3, "GETATTR3res *" },
+	{ "nfsv3", "op-setattr-start", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-setattr-start", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-setattr-start", 2, 3, "SETATTR3args *" },
+	{ "nfsv3", "op-setattr-done", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-setattr-done", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-setattr-done", 2, 3, "SETATTR3res *" },
+	{ "nfsv3", "op-lookup-start", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-lookup-start", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-lookup-start", 2, 3, "LOOKUP3args *" },
+	{ "nfsv3", "op-lookup-done", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-lookup-done", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-lookup-done", 2, 3, "LOOKUP3res *" },
+	{ "nfsv3", "op-access-start", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-access-start", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-access-start", 2, 3, "ACCESS3args *" },
+	{ "nfsv3", "op-access-done", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-access-done", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-access-done", 2, 3, "ACCESS3res *" },
+	{ "nfsv3", "op-commit-start", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-commit-start", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-commit-start", 2, 3, "COMMIT3args *" },
+	{ "nfsv3", "op-commit-done", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-commit-done", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-commit-done", 2, 3, "COMMIT3res *" },
+	{ "nfsv3", "op-create-start", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-create-start", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-create-start", 2, 3, "CREATE3args *" },
+	{ "nfsv3", "op-create-done", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-create-done", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-create-done", 2, 3, "CREATE3res *" },
+	{ "nfsv3", "op-fsinfo-start", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-fsinfo-start", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-fsinfo-start", 2, 3, "FSINFO3args *" },
+	{ "nfsv3", "op-fsinfo-done", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-fsinfo-done", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-fsinfo-done", 2, 3, "FSINFO3res *" },
+	{ "nfsv3", "op-fsstat-start", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-fsstat-start", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-fsstat-start", 2, 3, "FSSTAT3args *" },
+	{ "nfsv3", "op-fsstat-done", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-fsstat-done", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-fsstat-done", 2, 3, "FSSTAT3res *" },
+	{ "nfsv3", "op-link-start", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-link-start", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-link-start", 2, 3, "LINK3args *" },
+	{ "nfsv3", "op-link-done", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-link-done", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-link-done", 2, 3, "LINK3res *" },
+	{ "nfsv3", "op-mkdir-start", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-mkdir-start", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-mkdir-start", 2, 3, "MKDIR3args *" },
+	{ "nfsv3", "op-mkdir-done", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-mkdir-done", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-mkdir-done", 2, 3, "MKDIR3res *" },
+	{ "nfsv3", "op-mknod-start", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-mknod-start", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-mknod-start", 2, 3, "MKNOD3args *" },
+	{ "nfsv3", "op-mknod-done", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-mknod-done", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-mknod-done", 2, 3, "MKNOD3res *" },
+	{ "nfsv3", "op-null-start", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-null-start", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-null-done", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-null-done", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-pathconf-start", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-pathconf-start", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-pathconf-start", 2, 3, "PATHCONF3args *" },
+	{ "nfsv3", "op-pathconf-done", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-pathconf-done", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-pathconf-done", 2, 3, "PATHCONF3res *" },
+	{ "nfsv3", "op-read-start", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-read-start", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-read-start", 2, 3, "READ3args *" },
+	{ "nfsv3", "op-read-done", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-read-done", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-read-done", 2, 3, "READ3res *" },
+	{ "nfsv3", "op-readdir-start", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-readdir-start", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-readdir-start", 2, 3, "READDIR3args *" },
+	{ "nfsv3", "op-readdir-done", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-readdir-done", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-readdir-done", 2, 3, "READDIR3res *" },
+	{ "nfsv3", "op-readdirplus-start", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-readdirplus-start", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-readdirplus-start", 2, 3, "READDIRPLUS3args *" },
+	{ "nfsv3", "op-readdirplus-done", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-readdirplus-done", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-readdirplus-done", 2, 3, "READDIRPLUS3res *" },
+	{ "nfsv3", "op-readlink-start", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-readlink-start", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-readlink-start", 2, 3, "READLINK3args *" },
+	{ "nfsv3", "op-readlink-done", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-readlink-done", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-readlink-done", 2, 3, "READLINK3res *" },
+	{ "nfsv3", "op-remove-start", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-remove-start", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-remove-start", 2, 3, "REMOVE3args *" },
+	{ "nfsv3", "op-remove-done", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-remove-done", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-remove-done", 2, 3, "REMOVE3res *" },
+	{ "nfsv3", "op-rename-start", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-rename-start", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-rename-start", 2, 3, "RENAME3args *" },
+	{ "nfsv3", "op-rename-done", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-rename-done", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-rename-done", 2, 3, "RENAME3res *" },
+	{ "nfsv3", "op-rmdir-start", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-rmdir-start", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-rmdir-start", 2, 3, "RMDIR3args *" },
+	{ "nfsv3", "op-rmdir-done", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-rmdir-done", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-rmdir-done", 2, 3, "RMDIR3res *" },
+	{ "nfsv3", "op-setattr-start", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-setattr-start", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-setattr-start", 2, 3, "SETATTR3args *" },
+	{ "nfsv3", "op-setattr-done", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-setattr-done", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-setattr-done", 2, 3, "SETATTR3res *" },
+	{ "nfsv3", "op-symlink-start", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-symlink-start", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-symlink-start", 2, 3, "SYMLINK3args *" },
+	{ "nfsv3", "op-symlink-done", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-symlink-done", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-symlink-done", 2, 3, "SYMLINK3res *" },
+	{ "nfsv3", "op-write-start", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-write-start", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-write-start", 2, 3, "WRITE3args *" },
+	{ "nfsv3", "op-write-done", 0, 0, "struct svc_req *",
+	    "conninfo_t *" },
+	{ "nfsv3", "op-write-done", 1, 1, "nfsv3oparg_t *",
+	    "nfsv3opinfo_t *" },
+	{ "nfsv3", "op-write-done", 2, 3, "WRITE3res *" },
+
+	{ "nfsv4", "null-start", 0, 0, "struct svc_req *", "conninfo_t *" },
+	{ "nfsv4", "null-done", 0, 0, "struct svc_req *", "conninfo_t *" },
+	{ "nfsv4", "compound-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "compound-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "compound-start", 2, 1, "COMPOUND4args *" },
+	{ "nfsv4", "compound-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "compound-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "compound-done", 2, 1, "COMPOUND4res *" },
+	{ "nfsv4", "op-access-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *"},
+	{ "nfsv4", "op-access-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-access-start", 2, 1, "ACCESS4args *" },
+	{ "nfsv4", "op-access-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-access-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-access-done", 2, 1, "ACCESS4res *" },
+	{ "nfsv4", "op-close-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-close-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-close-start", 2, 1, "CLOSE4args *" },
+	{ "nfsv4", "op-close-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-close-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-close-done", 2, 1, "CLOSE4res *" },
+	{ "nfsv4", "op-commit-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-commit-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-commit-start", 2, 1, "COMMIT4args *" },
+	{ "nfsv4", "op-commit-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-commit-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-commit-done", 2, 1, "COMMIT4res *" },
+	{ "nfsv4", "op-create-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-create-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-create-start", 2, 1, "CREATE4args *" },
+	{ "nfsv4", "op-create-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-create-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-create-done", 2, 1, "CREATE4res *" },
+	{ "nfsv4", "op-delegpurge-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-delegpurge-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-delegpurge-start", 2, 1, "DELEGPURGE4args *" },
+	{ "nfsv4", "op-delegpurge-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-delegpurge-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-delegpurge-done", 2, 1, "DELEGPURGE4res *" },
+	{ "nfsv4", "op-delegreturn-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-delegreturn-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-delegreturn-start", 2, 1, "DELEGRETURN4args *" },
+	{ "nfsv4", "op-delegreturn-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-delegreturn-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-delegreturn-done", 2, 1, "DELEGRETURN4res *" },
+	{ "nfsv4", "op-getattr-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-getattr-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-getattr-start", 2, 1, "GETATTR4args *" },
+	{ "nfsv4", "op-getattr-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-getattr-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-getattr-done", 2, 1, "GETATTR4res *" },
+	{ "nfsv4", "op-getfh-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-getfh-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-getfh-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-getfh-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-getfh-done", 2, 1, "GETFH4res *" },
+	{ "nfsv4", "op-link-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-link-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-link-start", 2, 1, "LINK4args *" },
+	{ "nfsv4", "op-link-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-link-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-link-done", 2, 1, "LINK4res *" },
+	{ "nfsv4", "op-lock-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-lock-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-lock-start", 2, 1, "LOCK4args *" },
+	{ "nfsv4", "op-lock-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-lock-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-lock-done", 2, 1, "LOCK4res *" },
+	{ "nfsv4", "op-lockt-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-lockt-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-lockt-start", 2, 1, "LOCKT4args *" },
+	{ "nfsv4", "op-lockt-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-lockt-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-lockt-done", 2, 1, "LOCKT4res *" },
+	{ "nfsv4", "op-locku-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-locku-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-locku-start", 2, 1, "LOCKU4args *" },
+	{ "nfsv4", "op-locku-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-locku-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-locku-done", 2, 1, "LOCKU4res *" },
+	{ "nfsv4", "op-lookup-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-lookup-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-lookup-start", 2, 1, "LOOKUP4args *" },
+	{ "nfsv4", "op-lookup-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-lookup-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-lookup-done", 2, 1, "LOOKUP4res *" },
+	{ "nfsv4", "op-lookupp-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-lookupp-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-lookupp-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-lookupp-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-lookupp-done", 2, 1, "LOOKUPP4res *" },
+	{ "nfsv4", "op-nverify-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-nverify-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-nverify-start", 2, 1, "NVERIFY4args *" },
+	{ "nfsv4", "op-nverify-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-nverify-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-nverify-done", 2, 1, "NVERIFY4res *" },
+	{ "nfsv4", "op-open-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-open-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-open-start", 2, 1, "OPEN4args *" },
+	{ "nfsv4", "op-open-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-open-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-open-done", 2, 1, "OPEN4res *" },
+	{ "nfsv4", "op-open-confirm-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-open-confirm-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-open-confirm-start", 2, 1, "OPEN_CONFIRM4args *" },
+	{ "nfsv4", "op-open-confirm-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-open-confirm-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-open-confirm-done", 2, 1, "OPEN_CONFIRM4res *" },
+	{ "nfsv4", "op-open-downgrade-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-open-downgrade-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-open-downgrade-start", 2, 1, "OPEN_DOWNGRADE4args *" },
+	{ "nfsv4", "op-open-downgrade-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-open-downgrade-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-open-downgrade-done", 2, 1, "OPEN_DOWNGRADE4res *" },
+	{ "nfsv4", "op-openattr-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-openattr-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-openattr-start", 2, 1, "OPENATTR4args *" },
+	{ "nfsv4", "op-openattr-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-openattr-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-openattr-done", 2, 1, "OPENATTR4res *" },
+	{ "nfsv4", "op-putfh-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-putfh-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-putfh-start", 2, 1, "PUTFH4args *" },
+	{ "nfsv4", "op-putfh-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-putfh-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-putfh-done", 2, 1, "PUTFH4res *" },
+	{ "nfsv4", "op-putpubfh-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-putpubfh-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-putpubfh-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-putpubfh-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-putpubfh-done", 2, 1, "PUTPUBFH4res *" },
+	{ "nfsv4", "op-putrootfh-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-putrootfh-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-putrootfh-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-putrootfh-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-putrootfh-done", 2, 1, "PUTROOTFH4res *" },
+	{ "nfsv4", "op-read-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-read-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-read-start", 2, 1, "READ4args *" },
+	{ "nfsv4", "op-read-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-read-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-read-done", 2, 1, "READ4res *" },
+	{ "nfsv4", "op-readdir-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-readdir-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-readdir-start", 2, 1, "READDIR4args *" },
+	{ "nfsv4", "op-readdir-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-readdir-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-readdir-done", 2, 1, "READDIR4res *" },
+	{ "nfsv4", "op-readlink-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-readlink-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-readlink-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-readlink-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-readlink-done", 2, 1, "READLINK4res *" },
+	{ "nfsv4", "op-release-lockowner-start", 0, 0,
+	    "struct compound_state *", "conninfo_t *" },
+	{ "nfsv4", "op-release-lockowner-start", 1, 0,
+	    "struct compound_state *", "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-release-lockowner-start", 2, 1,
+	    "RELEASE_LOCKOWNER4args *" },
+	{ "nfsv4", "op-release-lockowner-done", 0, 0,
+	    "struct compound_state *", "conninfo_t *" },
+	{ "nfsv4", "op-release-lockowner-done", 1, 0,
+	    "struct compound_state *", "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-release-lockowner-done", 2, 1,
+	    "RELEASE_LOCKOWNER4res *" },
+	{ "nfsv4", "op-remove-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-remove-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-remove-start", 2, 1, "REMOVE4args *" },
+	{ "nfsv4", "op-remove-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-remove-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-remove-done", 2, 1, "REMOVE4res *" },
+	{ "nfsv4", "op-rename-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-rename-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-rename-start", 2, 1, "RENAME4args *" },
+	{ "nfsv4", "op-rename-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-rename-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-rename-done", 2, 1, "RENAME4res *" },
+	{ "nfsv4", "op-renew-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-renew-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-renew-start", 2, 1, "RENEW4args *" },
+	{ "nfsv4", "op-renew-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-renew-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-renew-done", 2, 1, "RENEW4res *" },
+	{ "nfsv4", "op-restorefh-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-restorefh-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-restorefh-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-restorefh-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-restorefh-done", 2, 1, "RESTOREFH4res *" },
+	{ "nfsv4", "op-savefh-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-savefh-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-savefh-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-savefh-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-savefh-done", 2, 1, "SAVEFH4res *" },
+	{ "nfsv4", "op-secinfo-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-secinfo-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-secinfo-start", 2, 1, "SECINFO4args *" },
+	{ "nfsv4", "op-secinfo-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-secinfo-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-secinfo-done", 2, 1, "SECINFO4res *" },
+	{ "nfsv4", "op-setattr-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-setattr-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-setattr-start", 2, 1, "SETATTR4args *" },
+	{ "nfsv4", "op-setattr-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-setattr-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-setattr-done", 2, 1, "SETATTR4res *" },
+	{ "nfsv4", "op-setclientid-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-setclientid-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-setclientid-start", 2, 1, "SETCLIENTID4args *" },
+	{ "nfsv4", "op-setclientid-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-setclientid-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-setclientid-done", 2, 1, "SETCLIENTID4res *" },
+	{ "nfsv4", "op-setclientid-confirm-start", 0, 0,
+	    "struct compound_state *", "conninfo_t *" },
+	{ "nfsv4", "op-setclientid-confirm-start", 1, 0,
+	    "struct compound_state *", "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-setclientid-confirm-start", 2, 1,
+	    "SETCLIENTID_CONFIRM4args *" },
+	{ "nfsv4", "op-setclientid-confirm-done", 0, 0,
+	    "struct compound_state *", "conninfo_t *" },
+	{ "nfsv4", "op-setclientid-confirm-done", 1, 0,
+	    "struct compound_state *", "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-setclientid-confirm-done", 2, 1,
+	    "SETCLIENTID_CONFIRM4res *" },
+	{ "nfsv4", "op-verify-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-verify-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-verify-start", 2, 1, "VERIFY4args *" },
+	{ "nfsv4", "op-verify-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-verify-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-verify-done", 2, 1, "VERIFY4res *" },
+	{ "nfsv4", "op-write-start", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-write-start", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-write-start", 2, 1, "WRITE4args *" },
+	{ "nfsv4", "op-write-done", 0, 0, "struct compound_state *",
+	    "conninfo_t *" },
+	{ "nfsv4", "op-write-done", 1, 0, "struct compound_state *",
+	    "nfsv4opinfo_t *" },
+	{ "nfsv4", "op-write-done", 2, 1, "WRITE4res *" },
+	{ "nfsv4", "cb-recall-start", 0, 0, "rfs4_client_t *",
+	    "conninfo_t *" },
+	{ "nfsv4", "cb-recall-start", 1, 1, "rfs4_deleg_state_t *",
+	    "nfsv4cbinfo_t *" },
+	{ "nfsv4", "cb-recall-start", 2, 2, "CB_RECALL4args *" },
+	{ "nfsv4", "cb-recall-done", 0, 0, "rfs4_client_t *",
+	    "conninfo_t *" },
+	{ "nfsv4", "cb-recall-done", 1, 1, "rfs4_deleg_state_t *",
+	    "nfsv4cbinfo_t *" },
+	{ "nfsv4", "cb-recall-done", 2, 2, "CB_RECALL4res *" },
+
+	{ "sysevent", "post", 0, 0, "evch_bind_t *", "syseventchaninfo_t *" },
+	{ "sysevent", "post", 1, 1, "sysevent_impl_t *", "syseventinfo_t *" },
+
+	{ "xpv", "add-to-physmap-end", 0, 0, "int" },
+	{ "xpv", "add-to-physmap-start", 0, 0, "domid_t" },
+	{ "xpv", "add-to-physmap-start", 1, 1, "uint_t" },
+	{ "xpv", "add-to-physmap-start", 2, 2, "ulong_t" },
+	{ "xpv", "add-to-physmap-start", 3, 3, "ulong_t" },
+	{ "xpv", "decrease-reservation-end", 0, 0, "int" },
+	{ "xpv", "decrease-reservation-start", 0, 0, "domid_t" },
+	{ "xpv", "decrease-reservation-start", 1, 1, "ulong_t" },
+	{ "xpv", "decrease-reservation-start", 2, 2, "uint_t" },
+	{ "xpv", "decrease-reservation-start", 3, 3, "ulong_t *" },
+	{ "xpv", "dom-create-start", 0, 0, "xen_domctl_t *" },
+	{ "xpv", "dom-destroy-start", 0, 0, "domid_t" },
+	{ "xpv", "dom-pause-start", 0, 0, "domid_t" },
+	{ "xpv", "dom-unpause-start", 0, 0, "domid_t" },
+	{ "xpv", "dom-create-end", 0, 0, "int" },
+	{ "xpv", "dom-destroy-end", 0, 0, "int" },
+	{ "xpv", "dom-pause-end", 0, 0, "int" },
+	{ "xpv", "dom-unpause-end", 0, 0, "int" },
+	{ "xpv", "evtchn-op-end", 0, 0, "int" },
+	{ "xpv", "evtchn-op-start", 0, 0, "int" },
+	{ "xpv", "evtchn-op-start", 1, 1, "void *" },
+	{ "xpv", "increase-reservation-end", 0, 0, "int" },
+	{ "xpv", "increase-reservation-start", 0, 0, "domid_t" },
+	{ "xpv", "increase-reservation-start", 1, 1, "ulong_t" },
+	{ "xpv", "increase-reservation-start", 2, 2, "uint_t" },
+	{ "xpv", "increase-reservation-start", 3, 3, "ulong_t *" },
+	{ "xpv", "mmap-end", 0, 0, "int" },
+	{ "xpv", "mmap-entry", 0, 0, "ulong_t" },
+	{ "xpv", "mmap-entry", 1, 1, "ulong_t" },
+	{ "xpv", "mmap-entry", 2, 2, "ulong_t" },
+	{ "xpv", "mmap-start", 0, 0, "domid_t" },
+	{ "xpv", "mmap-start", 1, 1, "int" },
+	{ "xpv", "mmap-start", 2, 2, "privcmd_mmap_entry_t *" },
+	{ "xpv", "mmapbatch-end", 0, 0, "int" },
+	{ "xpv", "mmapbatch-end", 1, 1, "struct seg *" },
+	{ "xpv", "mmapbatch-end", 2, 2, "caddr_t" },
+	{ "xpv", "mmapbatch-start", 0, 0, "domid_t" },
+	{ "xpv", "mmapbatch-start", 1, 1, "int" },
+	{ "xpv", "mmapbatch-start", 2, 2, "caddr_t" },
+	{ "xpv", "mmu-ext-op-end", 0, 0, "int" },
+	{ "xpv", "mmu-ext-op-start", 0, 0, "int" },
+	{ "xpv", "mmu-ext-op-start", 1, 1, "struct mmuext_op *" },
+	{ "xpv", "mmu-update-start", 0, 0, "int" },
+	{ "xpv", "mmu-update-start", 1, 1, "int" },
+	{ "xpv", "mmu-update-start", 2, 2, "mmu_update_t *" },
+	{ "xpv", "mmu-update-end", 0, 0, "int" },
+	{ "xpv", "populate-physmap-end", 0, 0, "int" },
+	{ "xpv", "populate-physmap-start", 0, 0, "domid_t" },
+	{ "xpv", "populate-physmap-start", 1, 1, "ulong_t" },
+	{ "xpv", "populate-physmap-start", 2, 2, "ulong_t *" },
+	{ "xpv", "set-memory-map-end", 0, 0, "int" },
+	{ "xpv", "set-memory-map-start", 0, 0, "domid_t" },
+	{ "xpv", "set-memory-map-start", 1, 1, "int" },
+	{ "xpv", "set-memory-map-start", 2, 2, "struct xen_memory_map *" },
+	{ "xpv", "setvcpucontext-end", 0, 0, "int" },
+	{ "xpv", "setvcpucontext-start", 0, 0, "domid_t" },
+	{ "xpv", "setvcpucontext-start", 1, 1, "vcpu_guest_context_t *" },
+	{ NULL }
+};
+
+/*ARGSUSED*/
+void
+sdt_getargdesc(void *arg, dtrace_id_t id, void *parg, dtrace_argdesc_t *desc)
+{
+	sdt_probe_t *sdp = parg;
+	int i;
+
+	desc->dtargd_native[0] = '\0';
+	desc->dtargd_xlate[0] = '\0';
+
+	for (i = 0; sdt_args[i].sda_provider != NULL; i++) {
+		sdt_argdesc_t *a = &sdt_args[i];
+
+		if (strcmp(sdp->sdp_provider->sdtp_name, a->sda_provider) != 0)
+			continue;
+
+		if (a->sda_name != NULL &&
+		    strcmp(sdp->sdp_name, a->sda_name) != 0)
+			continue;
+
+		if (desc->dtargd_ndx != a->sda_ndx)
+			continue;
+
+		if (a->sda_native != NULL)
+			(void) strcpy(desc->dtargd_native, a->sda_native);
+
+		if (a->sda_xlate != NULL)
+			(void) strcpy(desc->dtargd_xlate, a->sda_xlate);
+
+		desc->dtargd_mapping = a->sda_mapping;
+		return;
+	}
+
+	desc->dtargd_ndx = DTRACE_ARGNONE;
+}
diff --git a/cddl/contrib/opensolaris/uts/common/dtrace/systrace.c b/cddl/contrib/opensolaris/uts/common/dtrace/systrace.c
new file mode 100644
index 0000000..be14660
--- /dev/null
+++ b/cddl/contrib/opensolaris/uts/common/dtrace/systrace.c
@@ -0,0 +1,373 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <sys/dtrace.h>
+#include <sys/systrace.h>
+#include <sys/stat.h>
+#include <sys/systm.h>
+#include <sys/conf.h>
+#include <sys/ddi.h>
+#include <sys/sunddi.h>
+#include <sys/atomic.h>
+
+#define	SYSTRACE_ARTIFICIAL_FRAMES	1
+
+#define	SYSTRACE_SHIFT			16
+#define	SYSTRACE_ISENTRY(x)		((int)(x) >> SYSTRACE_SHIFT)
+#define	SYSTRACE_SYSNUM(x)		((int)(x) & ((1 << SYSTRACE_SHIFT) - 1))
+#define	SYSTRACE_ENTRY(id)		((1 << SYSTRACE_SHIFT) | (id))
+#define	SYSTRACE_RETURN(id)		(id)
+
+#if ((1 << SYSTRACE_SHIFT) <= NSYSCALL)
+#error 1 << SYSTRACE_SHIFT must exceed number of system calls
+#endif
+
+static dev_info_t *systrace_devi;
+static dtrace_provider_id_t systrace_id;
+
+static void
+systrace_init(struct sysent *actual, systrace_sysent_t **interposed)
+{
+	systrace_sysent_t *sysent = *interposed;
+	int i;
+
+	if (sysent == NULL) {
+		*interposed = sysent = kmem_zalloc(sizeof (systrace_sysent_t) *
+		    NSYSCALL, KM_SLEEP);
+	}
+
+	for (i = 0; i < NSYSCALL; i++) {
+		struct sysent *a = &actual[i];
+		systrace_sysent_t *s = &sysent[i];
+
+		if (LOADABLE_SYSCALL(a) && !LOADED_SYSCALL(a))
+			continue;
+
+		if (a->sy_callc == dtrace_systrace_syscall)
+			continue;
+
+#ifdef _SYSCALL32_IMPL
+		if (a->sy_callc == dtrace_systrace_syscall32)
+			continue;
+#endif
+
+		s->stsy_underlying = a->sy_callc;
+	}
+}
+
+/*ARGSUSED*/
+static void
+systrace_provide(void *arg, const dtrace_probedesc_t *desc)
+{
+	int i;
+
+	if (desc != NULL)
+		return;
+
+	systrace_init(sysent, &systrace_sysent);
+#ifdef _SYSCALL32_IMPL
+	systrace_init(sysent32, &systrace_sysent32);
+#endif
+
+	for (i = 0; i < NSYSCALL; i++) {
+		if (systrace_sysent[i].stsy_underlying == NULL)
+			continue;
+
+		if (dtrace_probe_lookup(systrace_id, NULL,
+		    syscallnames[i], "entry") != 0)
+			continue;
+
+		(void) dtrace_probe_create(systrace_id, NULL, syscallnames[i],
+		    "entry", SYSTRACE_ARTIFICIAL_FRAMES,
+		    (void *)((uintptr_t)SYSTRACE_ENTRY(i)));
+		(void) dtrace_probe_create(systrace_id, NULL, syscallnames[i],
+		    "return", SYSTRACE_ARTIFICIAL_FRAMES,
+		    (void *)((uintptr_t)SYSTRACE_RETURN(i)));
+
+		systrace_sysent[i].stsy_entry = DTRACE_IDNONE;
+		systrace_sysent[i].stsy_return = DTRACE_IDNONE;
+#ifdef _SYSCALL32_IMPL
+		systrace_sysent32[i].stsy_entry = DTRACE_IDNONE;
+		systrace_sysent32[i].stsy_return = DTRACE_IDNONE;
+#endif
+	}
+}
+
+/*ARGSUSED*/
+static void
+systrace_destroy(void *arg, dtrace_id_t id, void *parg)
+{
+	int sysnum = SYSTRACE_SYSNUM((uintptr_t)parg);
+
+	/*
+	 * There's nothing to do here but assert that we have actually been
+	 * disabled.
+	 */
+	if (SYSTRACE_ISENTRY((uintptr_t)parg)) {
+		ASSERT(systrace_sysent[sysnum].stsy_entry == DTRACE_IDNONE);
+#ifdef _SYSCALL32_IMPL
+		ASSERT(systrace_sysent32[sysnum].stsy_entry == DTRACE_IDNONE);
+#endif
+	} else {
+		ASSERT(systrace_sysent[sysnum].stsy_return == DTRACE_IDNONE);
+#ifdef _SYSCALL32_IMPL
+		ASSERT(systrace_sysent32[sysnum].stsy_return == DTRACE_IDNONE);
+#endif
+	}
+}
+
+/*ARGSUSED*/
+static void
+systrace_enable(void *arg, dtrace_id_t id, void *parg)
+{
+	int sysnum = SYSTRACE_SYSNUM((uintptr_t)parg);
+	int enabled = (systrace_sysent[sysnum].stsy_entry != DTRACE_IDNONE ||
+	    systrace_sysent[sysnum].stsy_return != DTRACE_IDNONE);
+
+	if (SYSTRACE_ISENTRY((uintptr_t)parg)) {
+		systrace_sysent[sysnum].stsy_entry = id;
+#ifdef _SYSCALL32_IMPL
+		systrace_sysent32[sysnum].stsy_entry = id;
+#endif
+	} else {
+		systrace_sysent[sysnum].stsy_return = id;
+#ifdef _SYSCALL32_IMPL
+		systrace_sysent32[sysnum].stsy_return = id;
+#endif
+	}
+
+	if (enabled) {
+		ASSERT(sysent[sysnum].sy_callc == dtrace_systrace_syscall);
+		return;
+	}
+
+	(void) casptr(&sysent[sysnum].sy_callc,
+	    (void *)systrace_sysent[sysnum].stsy_underlying,
+	    (void *)dtrace_systrace_syscall);
+#ifdef _SYSCALL32_IMPL
+	(void) casptr(&sysent32[sysnum].sy_callc,
+	    (void *)systrace_sysent32[sysnum].stsy_underlying,
+	    (void *)dtrace_systrace_syscall32);
+#endif
+}
+
+/*ARGSUSED*/
+static void
+systrace_disable(void *arg, dtrace_id_t id, void *parg)
+{
+	int sysnum = SYSTRACE_SYSNUM((uintptr_t)parg);
+	int disable = (systrace_sysent[sysnum].stsy_entry == DTRACE_IDNONE ||
+	    systrace_sysent[sysnum].stsy_return == DTRACE_IDNONE);
+
+	if (disable) {
+		(void) casptr(&sysent[sysnum].sy_callc,
+		    (void *)dtrace_systrace_syscall,
+		    (void *)systrace_sysent[sysnum].stsy_underlying);
+
+#ifdef _SYSCALL32_IMPL
+		(void) casptr(&sysent32[sysnum].sy_callc,
+		    (void *)dtrace_systrace_syscall32,
+		    (void *)systrace_sysent32[sysnum].stsy_underlying);
+#endif
+	}
+
+	if (SYSTRACE_ISENTRY((uintptr_t)parg)) {
+		systrace_sysent[sysnum].stsy_entry = DTRACE_IDNONE;
+#ifdef _SYSCALL32_IMPL
+		systrace_sysent32[sysnum].stsy_entry = DTRACE_IDNONE;
+#endif
+	} else {
+		systrace_sysent[sysnum].stsy_return = DTRACE_IDNONE;
+#ifdef _SYSCALL32_IMPL
+		systrace_sysent32[sysnum].stsy_return = DTRACE_IDNONE;
+#endif
+	}
+}
+
+static dtrace_pattr_t systrace_attr = {
+{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
+{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
+{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
+};
+
+static dtrace_pops_t systrace_pops = {
+	systrace_provide,
+	NULL,
+	systrace_enable,
+	systrace_disable,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	systrace_destroy
+};
+
+static int
+systrace_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
+{
+	switch (cmd) {
+	case DDI_ATTACH:
+		break;
+	case DDI_RESUME:
+		return (DDI_SUCCESS);
+	default:
+		return (DDI_FAILURE);
+	}
+
+	systrace_probe = (void (*)())dtrace_probe;
+	membar_enter();
+
+	if (ddi_create_minor_node(devi, "systrace", S_IFCHR, 0,
+	    DDI_PSEUDO, NULL) == DDI_FAILURE ||
+	    dtrace_register("syscall", &systrace_attr, DTRACE_PRIV_USER, NULL,
+	    &systrace_pops, NULL, &systrace_id) != 0) {
+		systrace_probe = systrace_stub;
+		ddi_remove_minor_node(devi, NULL);
+		return (DDI_FAILURE);
+	}
+
+	ddi_report_dev(devi);
+	systrace_devi = devi;
+
+	return (DDI_SUCCESS);
+}
+
+static int
+systrace_detach(dev_info_t *devi, ddi_detach_cmd_t cmd)
+{
+	switch (cmd) {
+	case DDI_DETACH:
+		break;
+	case DDI_SUSPEND:
+		return (DDI_SUCCESS);
+	default:
+		return (DDI_FAILURE);
+	}
+
+	if (dtrace_unregister(systrace_id) != 0)
+		return (DDI_FAILURE);
+
+	ddi_remove_minor_node(devi, NULL);
+	systrace_probe = systrace_stub;
+	return (DDI_SUCCESS);
+}
+
+/*ARGSUSED*/
+static int
+systrace_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
+{
+	int error;
+
+	switch (infocmd) {
+	case DDI_INFO_DEVT2DEVINFO:
+		*result = (void *)systrace_devi;
+		error = DDI_SUCCESS;
+		break;
+	case DDI_INFO_DEVT2INSTANCE:
+		*result = (void *)0;
+		error = DDI_SUCCESS;
+		break;
+	default:
+		error = DDI_FAILURE;
+	}
+	return (error);
+}
+
+/*ARGSUSED*/
+static int
+systrace_open(dev_t *devp, int flag, int otyp, cred_t *cred_p)
+{
+	return (0);
+}
+
+static struct cb_ops systrace_cb_ops = {
+	systrace_open,		/* open */
+	nodev,			/* close */
+	nulldev,		/* strategy */
+	nulldev,		/* print */
+	nodev,			/* dump */
+	nodev,			/* read */
+	nodev,			/* write */
+	nodev,			/* ioctl */
+	nodev,			/* devmap */
+	nodev,			/* mmap */
+	nodev,			/* segmap */
+	nochpoll,		/* poll */
+	ddi_prop_op,		/* cb_prop_op */
+	0,			/* streamtab  */
+	D_NEW | D_MP		/* Driver compatibility flag */
+};
+
+static struct dev_ops systrace_ops = {
+	DEVO_REV,		/* devo_rev, */
+	0,			/* refcnt  */
+	systrace_info,		/* get_dev_info */
+	nulldev,		/* identify */
+	nulldev,		/* probe */
+	systrace_attach,	/* attach */
+	systrace_detach,	/* detach */
+	nodev,			/* reset */
+	&systrace_cb_ops,	/* driver operations */
+	NULL,			/* bus operations */
+	nodev			/* dev power */
+};
+
+/*
+ * Module linkage information for the kernel.
+ */
+static struct modldrv modldrv = {
+	&mod_driverops,		/* module type (this is a pseudo driver) */
+	"System Call Tracing",	/* name of module */
+	&systrace_ops,		/* driver ops */
+};
+
+static struct modlinkage modlinkage = {
+	MODREV_1,
+	(void *)&modldrv,
+	NULL
+};
+
+int
+_init(void)
+{
+	return (mod_install(&modlinkage));
+}
+
+int
+_info(struct modinfo *modinfop)
+{
+	return (mod_info(&modlinkage, modinfop));
+}
+
+int
+_fini(void)
+{
+	return (mod_remove(&modlinkage));
+}
diff --git a/cddl/contrib/opensolaris/uts/common/sys/cmn_err.h b/cddl/contrib/opensolaris/uts/common/sys/cmn_err.h
new file mode 100644
index 0000000..e710d8e
--- /dev/null
+++ b/cddl/contrib/opensolaris/uts/common/sys/cmn_err.h
@@ -0,0 +1,128 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
+/*	  All Rights Reserved  	*/
+
+
+/*
+ * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef _SYS_CMN_ERR_H
+#define	_SYS_CMN_ERR_H
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#if defined(_KERNEL) && !defined(_ASM)
+#include <sys/va_list.h>
+#endif
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/* Common error handling severity levels */
+
+#define	CE_CONT		0	/* continuation		*/
+#define	CE_NOTE		1	/* notice		*/
+#define	CE_WARN		2	/* warning		*/
+#define	CE_PANIC	3	/* panic		*/
+#define	CE_IGNORE	4	/* print nothing	*/
+
+#ifndef _ASM
+
+#ifdef _KERNEL
+
+/*PRINTFLIKE2*/
+extern void cmn_err(int, const char *, ...)
+    __KPRINTFLIKE(2);
+#pragma rarely_called(cmn_err)
+
+extern void vzcmn_err(zoneid_t, int, const char *, __va_list)
+    __KVPRINTFLIKE(3);
+#pragma rarely_called(vzcmn_err)
+
+extern void vcmn_err(int, const char *, __va_list)
+    __KVPRINTFLIKE(2);
+#pragma rarely_called(vcmn_err)
+
+/*PRINTFLIKE3*/
+extern void zcmn_err(zoneid_t, int, const char *, ...)
+    __KPRINTFLIKE(3);
+#pragma rarely_called(zcmn_err)
+
+/*PRINTFLIKE1*/
+extern void printf(const char *, ...)
+    __KPRINTFLIKE(1);
+#pragma	rarely_called(printf)
+
+extern void vzprintf(zoneid_t, const char *, __va_list)
+    __KVPRINTFLIKE(2);
+#pragma rarely_called(vzprintf)
+
+/*PRINTFLIKE2*/
+extern void zprintf(zoneid_t, const char *, ...)
+    __KPRINTFLIKE(2);
+#pragma rarely_called(zprintf)
+
+extern void vprintf(const char *, __va_list)
+    __KVPRINTFLIKE(1);
+#pragma	rarely_called(vprintf)
+
+/*PRINTFLIKE1*/
+extern void uprintf(const char *, ...)
+    __KPRINTFLIKE(1);
+#pragma rarely_called(uprintf)
+
+extern void vuprintf(const char *, __va_list)
+    __KVPRINTFLIKE(1);
+#pragma rarely_called(vuprintf)
+
+/*PRINTFLIKE3*/
+extern size_t snprintf(char *, size_t, const char *, ...)
+    __KPRINTFLIKE(3);
+extern size_t vsnprintf(char *, size_t, const char *, __va_list)
+    __KVPRINTFLIKE(3);
+/*PRINTFLIKE2*/
+extern char *sprintf(char *, const char *, ...)
+    __KPRINTFLIKE(2);
+extern char *vsprintf(char *, const char *, __va_list)
+    __KVPRINTFLIKE(2);
+
+/*PRINTFLIKE1*/
+extern void panic(const char *, ...)
+    __KPRINTFLIKE(1) __NORETURN;
+#pragma rarely_called(panic)
+
+extern void vpanic(const char *, __va_list)
+    __KVPRINTFLIKE(1) __NORETURN;
+#pragma rarely_called(vpanic)
+
+#endif /* _KERNEL */
+#endif /* !_ASM */
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* _SYS_CMN_ERR_H */
diff --git a/cddl/contrib/opensolaris/uts/common/sys/cpupart.h b/cddl/contrib/opensolaris/uts/common/sys/cpupart.h
new file mode 100644
index 0000000..b9e0da4
--- /dev/null
+++ b/cddl/contrib/opensolaris/uts/common/sys/cpupart.h
@@ -0,0 +1,162 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef	_SYS_CPUPART_H
+#define	_SYS_CPUPART_H
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <sys/types.h>
+#include <sys/processor.h>
+#include <sys/cpuvar.h>
+#include <sys/disp.h>
+#include <sys/pset.h>
+#include <sys/lgrp.h>
+#include <sys/lgrp_user.h>
+#include <sys/pg.h>
+#include <sys/bitset.h>
+#include <sys/time.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#ifdef _KERNEL
+
+typedef int	cpupartid_t;
+
+/*
+ * Special partition id.
+ */
+#define	CP_DEFAULT	0
+
+/*
+ * Flags for cpupart_list()
+ */
+#define	CP_ALL		0		/* return all cpu partitions */
+#define	CP_NONEMPTY	1		/* return only non-empty ones */
+
+#if defined(_MACHDEP)
+struct mach_cpupart {
+	cpuset_t	mc_haltset;
+};
+
+extern struct mach_cpupart cp_default_mach;
+#else
+struct mach_cpupart;
+#endif
+
+typedef struct cpupart {
+	disp_t		cp_kp_queue;	/* partition-wide kpreempt queue */
+	cpupartid_t	cp_id;		/* partition ID */
+	int		cp_ncpus;	/* number of online processors */
+	struct cpupart	*cp_next;	/* next partition in list */
+	struct cpupart	*cp_prev;	/* previous partition in list */
+	struct cpu	*cp_cpulist;	/* processor list */
+	struct kstat	*cp_kstat;	/* per-partition statistics */
+
+	/*
+	 * cp_nrunnable and cp_nrunning are used to calculate load average.
+	 */
+	uint_t		cp_nrunnable;	/* current # of runnable threads */
+	uint_t		cp_nrunning;	/* current # of running threads */
+
+	/*
+	 * cp_updates, cp_nrunnable_cum, cp_nwaiting_cum, and cp_hp_avenrun
+	 * are used to generate kstat information on an as-needed basis.
+	 */
+	uint64_t	cp_updates;	/* number of statistics updates */
+	uint64_t	cp_nrunnable_cum; /* cum. # of runnable threads */
+	uint64_t	cp_nwaiting_cum;  /* cum. # of waiting threads */
+
+	struct loadavg_s cp_loadavg;	/* cpupart loadavg */
+
+	klgrpset_t	cp_lgrpset;	/* set of lgroups on which this */
+					/*    partition has cpus */
+	lpl_t		*cp_lgrploads;	/* table of load averages for this  */
+					/*    partition, indexed by lgrp ID */
+	int		cp_nlgrploads;	/* size of cp_lgrploads table */
+	uint64_t	cp_hp_avenrun[3]; /* high-precision load average */
+	uint_t		cp_attr;	/* bitmask of attributes */
+	lgrp_gen_t	cp_gen;		/* generation number */
+	lgrp_id_t	cp_lgrp_hint;	/* last home lgroup chosen */
+	bitset_t	cp_cmt_pgs;	/* CMT PGs represented */
+
+	struct mach_cpupart *cp_mach;   /* mach-specific */
+} cpupart_t;
+
+typedef struct cpupart_kstat {
+	kstat_named_t	cpk_updates;		/* number of updates */
+	kstat_named_t	cpk_runnable;		/* cum # of runnable threads */
+	kstat_named_t	cpk_waiting;		/* cum # waiting for I/O */
+	kstat_named_t	cpk_ncpus;		/* current # of CPUs */
+	kstat_named_t	cpk_avenrun_1min;	/* 1-minute load average */
+	kstat_named_t	cpk_avenrun_5min;	/* 5-minute load average */
+	kstat_named_t	cpk_avenrun_15min;	/* 15-minute load average */
+} cpupart_kstat_t;
+
+/*
+ * Macro to obtain the maximum run priority for the global queue associated
+ * with given cpu partition.
+ */
+#define	CP_MAXRUNPRI(cp)	((cp)->cp_kp_queue.disp_maxrunpri)
+
+/*
+ * This macro is used to determine if the given thread must surrender
+ * CPU to higher priority runnable threads on one of its dispatch queues.
+ * This should really be defined in <sys/disp.h> but it is not because
+ * including <sys/cpupart.h> there would cause recursive includes.
+ */
+#define	DISP_MUST_SURRENDER(t)				\
+	((DISP_MAXRUNPRI(t) > DISP_PRIO(t)) ||		\
+	(CP_MAXRUNPRI(t->t_cpupart) > DISP_PRIO(t)))
+
+extern cpupart_t	cp_default;
+extern cpupart_t	*cp_list_head;
+extern uint_t		cp_numparts;
+extern uint_t		cp_numparts_nonempty;
+
+extern void	cpupart_initialize_default();
+extern cpupart_t *cpupart_find(psetid_t);
+extern int	cpupart_create(psetid_t *);
+extern int	cpupart_destroy(psetid_t);
+extern psetid_t	cpupart_query_cpu(cpu_t *);
+extern int	cpupart_attach_cpu(psetid_t, cpu_t *, int);
+extern int	cpupart_get_cpus(psetid_t *, processorid_t *, uint_t *);
+extern int	cpupart_bind_thread(kthread_id_t, psetid_t, int, void *,
+    void *);
+extern void	cpupart_kpqalloc(pri_t);
+extern int	cpupart_get_loadavg(psetid_t, int *, int);
+extern uint_t	cpupart_list(psetid_t *, uint_t, int);
+extern int	cpupart_setattr(psetid_t, uint_t);
+extern int	cpupart_getattr(psetid_t, uint_t *);
+
+#endif	/* _KERNEL */
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* _SYS_CPUPART_H */
diff --git a/cddl/contrib/opensolaris/uts/common/sys/cpuvar.h b/cddl/contrib/opensolaris/uts/common/sys/cpuvar.h
new file mode 100644
index 0000000..c7b76b3
--- /dev/null
+++ b/cddl/contrib/opensolaris/uts/common/sys/cpuvar.h
@@ -0,0 +1,737 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef _SYS_CPUVAR_H
+#define	_SYS_CPUVAR_H
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <sys/thread.h>
+#include <sys/sysinfo.h>	/* has cpu_stat_t definition */
+#include <sys/disp.h>
+#include <sys/processor.h>
+
+#if (defined(_KERNEL) || defined(_KMEMUSER)) && defined(_MACHDEP)
+#include <sys/machcpuvar.h>
+#endif
+
+#include <sys/types.h>
+#include <sys/file.h>
+#include <sys/bitmap.h>
+#include <sys/rwlock.h>
+#include <sys/msacct.h>
+#if defined(__GNUC__) && defined(_ASM_INLINES) && defined(_KERNEL) && \
+	(defined(__i386) || defined(__amd64))
+#include <asm/cpuvar.h>
+#endif
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+struct squeue_set_s;
+
+#define	CPU_CACHE_COHERENCE_SIZE	64
+#define	S_LOADAVG_SZ	11
+#define	S_MOVAVG_SZ	10
+
+struct loadavg_s {
+	int lg_cur;		/* current loadavg entry */
+	unsigned int lg_len;	/* number entries recorded */
+	hrtime_t lg_total;	/* used to temporarily hold load totals */
+	hrtime_t lg_loads[S_LOADAVG_SZ];	/* table of recorded entries */
+};
+
+/*
+ * For fast event tracing.
+ */
+struct ftrace_record;
+typedef struct ftrace_data {
+	int			ftd_state;	/* ftrace flags */
+	kmutex_t		ftd_unused;	/* ftrace buffer lock, unused */
+	struct ftrace_record	*ftd_cur;	/* current record */
+	struct ftrace_record	*ftd_first;	/* first record */
+	struct ftrace_record	*ftd_last;	/* last record */
+} ftrace_data_t;
+
+struct cyc_cpu;
+struct nvlist;
+
+/*
+ * Per-CPU data.
+ *
+ * Be careful adding new members: if they are not the same in all modules (e.g.
+ * change size depending on a #define), CTF uniquification can fail to work
+ * properly.  Furthermore, this is transitive in that it applies recursively to
+ * all types pointed to by cpu_t.
+ */
+typedef struct cpu {
+	processorid_t	cpu_id;			/* CPU number */
+	processorid_t	cpu_seqid;	/* sequential CPU id (0..ncpus-1) */
+	volatile cpu_flag_t cpu_flags;		/* flags indicating CPU state */
+	struct cpu	*cpu_self;		/* pointer to itself */
+	kthread_t	*cpu_thread;		/* current thread */
+	kthread_t	*cpu_idle_thread;	/* idle thread for this CPU */
+	kthread_t	*cpu_pause_thread;	/* pause thread for this CPU */
+	klwp_id_t	cpu_lwp;		/* current lwp (if any) */
+	klwp_id_t	cpu_fpowner;		/* currently loaded fpu owner */
+	struct cpupart	*cpu_part;		/* partition with this CPU */
+	struct lgrp_ld	*cpu_lpl;		/* pointer to this cpu's load */
+	int		cpu_cache_offset;	/* see kmem.c for details */
+
+	/*
+	 * Links to other CPUs.  It is safe to walk these lists if
+	 * one of the following is true:
+	 * 	- cpu_lock held
+	 * 	- preemption disabled via kpreempt_disable
+	 * 	- PIL >= DISP_LEVEL
+	 * 	- acting thread is an interrupt thread
+	 * 	- all other CPUs are paused
+	 */
+	struct cpu	*cpu_next;		/* next existing CPU */
+	struct cpu	*cpu_prev;		/* prev existing CPU */
+	struct cpu	*cpu_next_onln;		/* next online (enabled) CPU */
+	struct cpu	*cpu_prev_onln;		/* prev online (enabled) CPU */
+	struct cpu	*cpu_next_part;		/* next CPU in partition */
+	struct cpu	*cpu_prev_part;		/* prev CPU in partition */
+	struct cpu	*cpu_next_lgrp;		/* next CPU in latency group */
+	struct cpu	*cpu_prev_lgrp;		/* prev CPU in latency group */
+	struct cpu	*cpu_next_lpl;		/* next CPU in lgrp partition */
+	struct cpu	*cpu_prev_lpl;
+
+	struct cpu_pg	*cpu_pg;		/* cpu's processor groups */
+
+	void		*cpu_reserved[4];	/* reserved for future use */
+
+	/*
+	 * Scheduling variables.
+	 */
+	disp_t		*cpu_disp;		/* dispatch queue data */
+	/*
+	 * Note that cpu_disp is set before the CPU is added to the system
+	 * and is never modified.  Hence, no additional locking is needed
+	 * beyond what's necessary to access the cpu_t structure.
+	 */
+	char		cpu_runrun;	/* scheduling flag - set to preempt */
+	char		cpu_kprunrun;		/* force kernel preemption */
+	pri_t		cpu_chosen_level; 	/* priority at which cpu */
+						/* was chosen for scheduling */
+	kthread_t	*cpu_dispthread; /* thread selected for dispatch */
+	disp_lock_t	cpu_thread_lock; /* dispatcher lock on current thread */
+	uint8_t		cpu_disp_flags;	/* flags used by dispatcher */
+	/*
+	 * The following field is updated when ever the cpu_dispthread
+	 * changes. Also in places, where the current thread(cpu_dispthread)
+	 * priority changes. This is used in disp_lowpri_cpu()
+	 */
+	pri_t		cpu_dispatch_pri; /* priority of cpu_dispthread */
+	clock_t		cpu_last_swtch;	/* last time switched to new thread */
+
+	/*
+	 * Interrupt data.
+	 */
+	caddr_t		cpu_intr_stack;	/* interrupt stack */
+	kthread_t	*cpu_intr_thread; /* interrupt thread list */
+	uint_t		cpu_intr_actv;	/* interrupt levels active (bitmask) */
+	int		cpu_base_spl;	/* priority for highest rupt active */
+
+	/*
+	 * Statistics.
+	 */
+	cpu_stats_t	cpu_stats;		/* per-CPU statistics */
+	struct kstat	*cpu_info_kstat;	/* kstat for cpu info */
+
+	uintptr_t	cpu_profile_pc;	/* kernel PC in profile interrupt */
+	uintptr_t	cpu_profile_upc; /* user PC in profile interrupt */
+	uintptr_t	cpu_profile_pil; /* PIL when profile interrupted */
+
+	ftrace_data_t	cpu_ftrace;		/* per cpu ftrace data */
+
+	clock_t		cpu_deadman_lbolt;	/* used by deadman() */
+	uint_t		cpu_deadman_countdown;	/* used by deadman() */
+
+	kmutex_t	cpu_cpc_ctxlock; /* protects context for idle thread */
+	kcpc_ctx_t	*cpu_cpc_ctx;	/* performance counter context */
+
+	/*
+	 * Configuration information for the processor_info system call.
+	 */
+	processor_info_t cpu_type_info;	/* config info */
+	time_t		cpu_state_begin; /* when CPU entered current state */
+	char		cpu_cpr_flags;	/* CPR related info */
+	struct cyc_cpu	*cpu_cyclic;	/* per cpu cyclic subsystem data */
+	struct squeue_set_s *cpu_squeue_set;	/* per cpu squeue set */
+	struct nvlist	*cpu_props;	/* pool-related properties */
+
+	krwlock_t	cpu_ft_lock;		/* DTrace: fasttrap lock */
+	uintptr_t	cpu_dtrace_caller;	/* DTrace: caller, if any */
+	hrtime_t	cpu_dtrace_chillmark;	/* DTrace: chill mark time */
+	hrtime_t	cpu_dtrace_chilled;	/* DTrace: total chill time */
+	volatile uint16_t cpu_mstate;		/* cpu microstate */
+	volatile uint16_t cpu_mstate_gen;	/* generation counter */
+	volatile hrtime_t cpu_mstate_start;	/* cpu microstate start time */
+	volatile hrtime_t cpu_acct[NCMSTATES];	/* cpu microstate data */
+	hrtime_t	cpu_intracct[NCMSTATES]; /* interrupt mstate data */
+	hrtime_t	cpu_waitrq;		/* cpu run-queue wait time */
+	struct loadavg_s cpu_loadavg;		/* loadavg info for this cpu */
+
+	char		*cpu_idstr;	/* for printing and debugging */
+	char		*cpu_brandstr;	/* for printing */
+
+	/*
+	 * Sum of all device interrupt weights that are currently directed at
+	 * this cpu. Cleared at start of interrupt redistribution.
+	 */
+	int32_t		cpu_intr_weight;
+	void		*cpu_vm_data;
+
+	struct cpu_physid *cpu_physid;	/* physical associations */
+
+	uint64_t	cpu_curr_clock;		/* current clock freq in Hz */
+	char		*cpu_supp_freqs;	/* supported freqs in Hz */
+
+	/*
+	 * Interrupt load factor used by dispatcher & softcall
+	 */
+	hrtime_t	cpu_intrlast;   /* total interrupt time (nsec) */
+	int		cpu_intrload;   /* interrupt load factor (0-99%) */
+
+	/*
+	 * New members must be added /before/ this member, as the CTF tools
+	 * rely on this being the last field before cpu_m, so they can
+	 * correctly calculate the offset when synthetically adding the cpu_m
+	 * member in objects that do not have it.  This fixup is required for
+	 * uniquification to work correctly.
+	 */
+	uintptr_t	cpu_m_pad;
+
+#if (defined(_KERNEL) || defined(_KMEMUSER)) && defined(_MACHDEP)
+	struct machcpu	cpu_m;		/* per architecture info */
+#endif
+} cpu_t;
+
+/*
+ * The cpu_core structure consists of per-CPU state available in any context.
+ * On some architectures, this may mean that the page(s) containing the
+ * NCPU-sized array of cpu_core structures must be locked in the TLB -- it
+ * is up to the platform to assure that this is performed properly.  Note that
+ * the structure is sized to avoid false sharing.
+ */
+#define	CPUC_SIZE		(sizeof (uint16_t) + sizeof (uintptr_t) + \
+				sizeof (kmutex_t))
+#define	CPUC_PADSIZE		CPU_CACHE_COHERENCE_SIZE - CPUC_SIZE
+
+typedef struct cpu_core {
+	uint16_t	cpuc_dtrace_flags;	/* DTrace flags */
+	uint8_t		cpuc_pad[CPUC_PADSIZE];	/* padding */
+	uintptr_t	cpuc_dtrace_illval;	/* DTrace illegal value */
+	kmutex_t	cpuc_pid_lock;		/* DTrace pid provider lock */
+} cpu_core_t;
+
+#ifdef _KERNEL
+extern cpu_core_t cpu_core[];
+#endif /* _KERNEL */
+
+/*
+ * CPU_ON_INTR() macro. Returns non-zero if currently on interrupt stack.
+ * Note that this isn't a test for a high PIL.  For example, cpu_intr_actv
+ * does not get updated when we go through sys_trap from TL>0 at high PIL.
+ * getpil() should be used instead to check for PIL levels.
+ */
+#define	CPU_ON_INTR(cpup) ((cpup)->cpu_intr_actv >> (LOCK_LEVEL + 1))
+
+#if defined(_KERNEL) || defined(_KMEMUSER)
+
+#define	INTR_STACK_SIZE	MAX(DEFAULTSTKSZ, PAGESIZE)
+
+/* MEMBERS PROTECTED BY "atomicity": cpu_flags */
+
+/*
+ * Flags in the CPU structure.
+ *
+ * These are protected by cpu_lock (except during creation).
+ *
+ * Offlined-CPUs have three stages of being offline:
+ *
+ * CPU_ENABLE indicates that the CPU is participating in I/O interrupts
+ * that can be directed at a number of different CPUs.  If CPU_ENABLE
+ * is off, the CPU will not be given interrupts that can be sent elsewhere,
+ * but will still get interrupts from devices associated with that CPU only,
+ * and from other CPUs.
+ *
+ * CPU_OFFLINE indicates that the dispatcher should not allow any threads
+ * other than interrupt threads to run on that CPU.  A CPU will not have
+ * CPU_OFFLINE set if there are any bound threads (besides interrupts).
+ *
+ * CPU_QUIESCED is set if p_offline was able to completely turn idle the
+ * CPU and it will not have to run interrupt threads.  In this case it'll
+ * stay in the idle loop until CPU_QUIESCED is turned off.
+ *
+ * CPU_FROZEN is used only by CPR to mark CPUs that have been successfully
+ * suspended (in the suspend path), or have yet to be resumed (in the resume
+ * case).
+ *
+ * On some platforms CPUs can be individually powered off.
+ * The following flags are set for powered off CPUs: CPU_QUIESCED,
+ * CPU_OFFLINE, and CPU_POWEROFF.  The following flags are cleared:
+ * CPU_RUNNING, CPU_READY, CPU_EXISTS, and CPU_ENABLE.
+ */
+#define	CPU_RUNNING	0x001		/* CPU running */
+#define	CPU_READY	0x002		/* CPU ready for cross-calls */
+#define	CPU_QUIESCED	0x004		/* CPU will stay in idle */
+#define	CPU_EXISTS	0x008		/* CPU is configured */
+#define	CPU_ENABLE	0x010		/* CPU enabled for interrupts */
+#define	CPU_OFFLINE	0x020		/* CPU offline via p_online */
+#define	CPU_POWEROFF	0x040		/* CPU is powered off */
+#define	CPU_FROZEN	0x080		/* CPU is frozen via CPR suspend */
+#define	CPU_SPARE	0x100		/* CPU offline available for use */
+#define	CPU_FAULTED	0x200		/* CPU offline diagnosed faulty */
+
+#define	FMT_CPU_FLAGS							\
+	"\20\12fault\11spare\10frozen"					\
+	"\7poweroff\6offline\5enable\4exist\3quiesced\2ready\1run"
+
+#define	CPU_ACTIVE(cpu)	(((cpu)->cpu_flags & CPU_OFFLINE) == 0)
+
+/*
+ * Flags for cpu_offline(), cpu_faulted(), and cpu_spare().
+ */
+#define	CPU_FORCED	0x0001		/* Force CPU offline */
+
+/*
+ * DTrace flags.
+ */
+#define	CPU_DTRACE_NOFAULT	0x0001	/* Don't fault */
+#define	CPU_DTRACE_DROP		0x0002	/* Drop this ECB */
+#define	CPU_DTRACE_BADADDR	0x0004	/* DTrace fault: bad address */
+#define	CPU_DTRACE_BADALIGN	0x0008	/* DTrace fault: bad alignment */
+#define	CPU_DTRACE_DIVZERO	0x0010	/* DTrace fault: divide by zero */
+#define	CPU_DTRACE_ILLOP	0x0020	/* DTrace fault: illegal operation */
+#define	CPU_DTRACE_NOSCRATCH	0x0040	/* DTrace fault: out of scratch */
+#define	CPU_DTRACE_KPRIV	0x0080	/* DTrace fault: bad kernel access */
+#define	CPU_DTRACE_UPRIV	0x0100	/* DTrace fault: bad user access */
+#define	CPU_DTRACE_TUPOFLOW	0x0200	/* DTrace fault: tuple stack overflow */
+#if defined(__sparc)
+#define	CPU_DTRACE_FAKERESTORE	0x0400	/* pid provider hint to getreg */
+#endif
+#define	CPU_DTRACE_ENTRY	0x0800	/* pid provider hint to ustack() */
+#define	CPU_DTRACE_BADSTACK	0x1000	/* DTrace fault: bad stack */
+
+#define	CPU_DTRACE_FAULT	(CPU_DTRACE_BADADDR | CPU_DTRACE_BADALIGN | \
+				CPU_DTRACE_DIVZERO | CPU_DTRACE_ILLOP | \
+				CPU_DTRACE_NOSCRATCH | CPU_DTRACE_KPRIV | \
+				CPU_DTRACE_UPRIV | CPU_DTRACE_TUPOFLOW | \
+				CPU_DTRACE_BADSTACK)
+#define	CPU_DTRACE_ERROR	(CPU_DTRACE_FAULT | CPU_DTRACE_DROP)
+
+/*
+ * Dispatcher flags
+ * These flags must be changed only by the current CPU.
+ */
+#define	CPU_DISP_DONTSTEAL	0x01	/* CPU undergoing context swtch */
+#define	CPU_DISP_HALTED		0x02	/* CPU halted waiting for interrupt */
+
+
+#endif /* _KERNEL || _KMEMUSER */
+
+#if (defined(_KERNEL) || defined(_KMEMUSER)) && defined(_MACHDEP)
+
+/*
+ * Macros for manipulating sets of CPUs as a bitmap.  Note that this
+ * bitmap may vary in size depending on the maximum CPU id a specific
+ * platform supports.  This may be different than the number of CPUs
+ * the platform supports, since CPU ids can be sparse.  We define two
+ * sets of macros; one for platforms where the maximum CPU id is less
+ * than the number of bits in a single word (32 in a 32-bit kernel,
+ * 64 in a 64-bit kernel), and one for platforms that require bitmaps
+ * of more than one word.
+ */
+
+#define	CPUSET_WORDS	BT_BITOUL(NCPU)
+#define	CPUSET_NOTINSET	((uint_t)-1)
+
+#if	CPUSET_WORDS > 1
+
+typedef struct cpuset {
+	ulong_t	cpub[CPUSET_WORDS];
+} cpuset_t;
+
+/*
+ * Private functions for manipulating cpusets that do not fit in a
+ * single word.  These should not be used directly; instead the
+ * CPUSET_* macros should be used so the code will be portable
+ * across different definitions of NCPU.
+ */
+extern	void	cpuset_all(cpuset_t *);
+extern	void	cpuset_all_but(cpuset_t *, uint_t);
+extern	int	cpuset_isnull(cpuset_t *);
+extern	int	cpuset_cmp(cpuset_t *, cpuset_t *);
+extern	void	cpuset_only(cpuset_t *, uint_t);
+extern	uint_t	cpuset_find(cpuset_t *);
+extern	void	cpuset_bounds(cpuset_t *, uint_t *, uint_t *);
+
+#define	CPUSET_ALL(set)			cpuset_all(&(set))
+#define	CPUSET_ALL_BUT(set, cpu)	cpuset_all_but(&(set), cpu)
+#define	CPUSET_ONLY(set, cpu)		cpuset_only(&(set), cpu)
+#define	CPU_IN_SET(set, cpu)		BT_TEST((set).cpub, cpu)
+#define	CPUSET_ADD(set, cpu)		BT_SET((set).cpub, cpu)
+#define	CPUSET_DEL(set, cpu)		BT_CLEAR((set).cpub, cpu)
+#define	CPUSET_ISNULL(set)		cpuset_isnull(&(set))
+#define	CPUSET_ISEQUAL(set1, set2)	cpuset_cmp(&(set1), &(set2))
+
+/*
+ * Find one CPU in the cpuset.
+ * Sets "cpu" to the id of the found CPU, or CPUSET_NOTINSET if no cpu
+ * could be found. (i.e. empty set)
+ */
+#define	CPUSET_FIND(set, cpu)		{		\
+	cpu = cpuset_find(&(set));			\
+}
+
+/*
+ * Determine the smallest and largest CPU id in the set. Returns
+ * CPUSET_NOTINSET in smallest and largest when set is empty.
+ */
+#define	CPUSET_BOUNDS(set, smallest, largest)	{		\
+	cpuset_bounds(&(set), &(smallest), &(largest));		\
+}
+
+/*
+ * Atomic cpuset operations
+ * These are safe to use for concurrent cpuset manipulations.
+ * "xdel" and "xadd" are exclusive operations, that set "result" to "0"
+ * if the add or del was successful, or "-1" if not successful.
+ * (e.g. attempting to add a cpu to a cpuset that's already there, or
+ * deleting a cpu that's not in the cpuset)
+ */
+
+#define	CPUSET_ATOMIC_DEL(set, cpu)	BT_ATOMIC_CLEAR((set).cpub, (cpu))
+#define	CPUSET_ATOMIC_ADD(set, cpu)	BT_ATOMIC_SET((set).cpub, (cpu))
+
+#define	CPUSET_ATOMIC_XADD(set, cpu, result) \
+	BT_ATOMIC_SET_EXCL((set).cpub, cpu, result)
+
+#define	CPUSET_ATOMIC_XDEL(set, cpu, result) \
+	BT_ATOMIC_CLEAR_EXCL((set).cpub, cpu, result)
+
+
+#define	CPUSET_OR(set1, set2)		{		\
+	int _i;						\
+	for (_i = 0; _i < CPUSET_WORDS; _i++)		\
+		(set1).cpub[_i] |= (set2).cpub[_i];	\
+}
+
+#define	CPUSET_XOR(set1, set2)		{		\
+	int _i;						\
+	for (_i = 0; _i < CPUSET_WORDS; _i++)		\
+		(set1).cpub[_i] ^= (set2).cpub[_i];	\
+}
+
+#define	CPUSET_AND(set1, set2)		{		\
+	int _i;						\
+	for (_i = 0; _i < CPUSET_WORDS; _i++)		\
+		(set1).cpub[_i] &= (set2).cpub[_i];	\
+}
+
+#define	CPUSET_ZERO(set)		{		\
+	int _i;						\
+	for (_i = 0; _i < CPUSET_WORDS; _i++)		\
+		(set).cpub[_i] = 0;			\
+}
+
+#elif	CPUSET_WORDS == 1
+
+typedef	ulong_t	cpuset_t;	/* a set of CPUs */
+
+#define	CPUSET(cpu)			(1UL << (cpu))
+
+#define	CPUSET_ALL(set)			((void)((set) = ~0UL))
+#define	CPUSET_ALL_BUT(set, cpu)	((void)((set) = ~CPUSET(cpu)))
+#define	CPUSET_ONLY(set, cpu)		((void)((set) = CPUSET(cpu)))
+#define	CPU_IN_SET(set, cpu)		((set) & CPUSET(cpu))
+#define	CPUSET_ADD(set, cpu)		((void)((set) |= CPUSET(cpu)))
+#define	CPUSET_DEL(set, cpu)		((void)((set) &= ~CPUSET(cpu)))
+#define	CPUSET_ISNULL(set)		((set) == 0)
+#define	CPUSET_ISEQUAL(set1, set2)	((set1) == (set2))
+#define	CPUSET_OR(set1, set2)		((void)((set1) |= (set2)))
+#define	CPUSET_XOR(set1, set2)		((void)((set1) ^= (set2)))
+#define	CPUSET_AND(set1, set2)		((void)((set1) &= (set2)))
+#define	CPUSET_ZERO(set)		((void)((set) = 0))
+
+#define	CPUSET_FIND(set, cpu)		{		\
+	cpu = (uint_t)(lowbit(set) - 1);				\
+}
+
+#define	CPUSET_BOUNDS(set, smallest, largest)	{	\
+	smallest = (uint_t)(lowbit(set) - 1);		\
+	largest = (uint_t)(highbit(set) - 1);		\
+}
+
+#define	CPUSET_ATOMIC_DEL(set, cpu)	atomic_and_long(&(set), ~CPUSET(cpu))
+#define	CPUSET_ATOMIC_ADD(set, cpu)	atomic_or_long(&(set), CPUSET(cpu))
+
+#define	CPUSET_ATOMIC_XADD(set, cpu, result) \
+	{ result = atomic_set_long_excl(&(set), (cpu)); }
+
+#define	CPUSET_ATOMIC_XDEL(set, cpu, result) \
+	{ result = atomic_clear_long_excl(&(set), (cpu)); }
+
+#else	/* CPUSET_WORDS <= 0 */
+
+#error NCPU is undefined or invalid
+
+#endif	/* CPUSET_WORDS	*/
+
+extern cpuset_t cpu_seqid_inuse;
+
+#endif	/* (_KERNEL || _KMEMUSER) && _MACHDEP */
+
+#define	CPU_CPR_OFFLINE		0x0
+#define	CPU_CPR_ONLINE		0x1
+#define	CPU_CPR_IS_OFFLINE(cpu)	(((cpu)->cpu_cpr_flags & CPU_CPR_ONLINE) == 0)
+#define	CPU_CPR_IS_ONLINE(cpu)	((cpu)->cpu_cpr_flags & CPU_CPR_ONLINE)
+#define	CPU_SET_CPR_FLAGS(cpu, flag)	((cpu)->cpu_cpr_flags |= flag)
+
+#if defined(_KERNEL) || defined(_KMEMUSER)
+
+extern struct cpu	*cpu[];		/* indexed by CPU number */
+extern cpu_t		*cpu_list;	/* list of CPUs */
+extern cpu_t		*cpu_active;	/* list of active CPUs */
+extern int		ncpus;		/* number of CPUs present */
+extern int		ncpus_online;	/* number of CPUs not quiesced */
+extern int		max_ncpus;	/* max present before ncpus is known */
+extern int		boot_max_ncpus;	/* like max_ncpus but for real */
+extern processorid_t	max_cpuid;	/* maximum CPU number */
+extern struct cpu	*cpu_inmotion;	/* offline or partition move target */
+extern cpu_t		*clock_cpu_list;
+
+#if defined(__i386) || defined(__amd64)
+extern struct cpu *curcpup(void);
+#define	CPU		(curcpup())	/* Pointer to current CPU */
+#else
+#define	CPU		(curthread->t_cpu)	/* Pointer to current CPU */
+#endif
+
+/*
+ * CPU_CURRENT indicates to thread_affinity_set to use CPU->cpu_id
+ * as the target and to grab cpu_lock instead of requiring the caller
+ * to grab it.
+ */
+#define	CPU_CURRENT	-3
+
+/*
+ * Per-CPU statistics
+ *
+ * cpu_stats_t contains numerous system and VM-related statistics, in the form
+ * of gauges or monotonically-increasing event occurrence counts.
+ */
+
+#define	CPU_STATS_ENTER_K()	kpreempt_disable()
+#define	CPU_STATS_EXIT_K()	kpreempt_enable()
+
+#define	CPU_STATS_ADD_K(class, stat, amount) \
+	{	kpreempt_disable(); /* keep from switching CPUs */\
+		CPU_STATS_ADDQ(CPU, class, stat, amount); \
+		kpreempt_enable(); \
+	}
+
+#define	CPU_STATS_ADDQ(cp, class, stat, amount)	{			\
+	extern void __dtrace_probe___cpu_##class##info_##stat(uint_t,	\
+	    uint64_t *, cpu_t *);					\
+	uint64_t *stataddr = &((cp)->cpu_stats.class.stat);		\
+	__dtrace_probe___cpu_##class##info_##stat((amount),		\
+	    stataddr, cp);						\
+	*(stataddr) += (amount);					\
+}
+
+#define	CPU_STATS(cp, stat)                                       \
+	((cp)->cpu_stats.stat)
+
+#endif /* _KERNEL || _KMEMUSER */
+
+/*
+ * CPU support routines.
+ */
+#if	defined(_KERNEL) && defined(__STDC__)	/* not for genassym.c */
+
+struct zone;
+
+void	cpu_list_init(cpu_t *);
+void	cpu_add_unit(cpu_t *);
+void	cpu_del_unit(int cpuid);
+void	cpu_add_active(cpu_t *);
+void	cpu_kstat_init(cpu_t *);
+void	cpu_visibility_add(cpu_t *, struct zone *);
+void	cpu_visibility_remove(cpu_t *, struct zone *);
+void	cpu_visibility_configure(cpu_t *, struct zone *);
+void	cpu_visibility_unconfigure(cpu_t *, struct zone *);
+void	cpu_visibility_online(cpu_t *, struct zone *);
+void	cpu_visibility_offline(cpu_t *, struct zone *);
+void	cpu_create_intrstat(cpu_t *);
+void	cpu_delete_intrstat(cpu_t *);
+int	cpu_kstat_intrstat_update(kstat_t *, int);
+void	cpu_intr_swtch_enter(kthread_t *);
+void	cpu_intr_swtch_exit(kthread_t *);
+
+void	mbox_lock_init(void);	 /* initialize cross-call locks */
+void	mbox_init(int cpun);	 /* initialize cross-calls */
+void	poke_cpu(int cpun);	 /* interrupt another CPU (to preempt) */
+
+/*
+ * values for safe_list.  Pause state that CPUs are in.
+ */
+#define	PAUSE_IDLE	0		/* normal state */
+#define	PAUSE_READY	1		/* paused thread ready to spl */
+#define	PAUSE_WAIT	2		/* paused thread is spl-ed high */
+#define	PAUSE_DIE	3		/* tell pause thread to leave */
+#define	PAUSE_DEAD	4		/* pause thread has left */
+
+void	mach_cpu_pause(volatile char *);
+
+void	pause_cpus(cpu_t *off_cp);
+void	start_cpus(void);
+int	cpus_paused(void);
+
+void	cpu_pause_init(void);
+cpu_t	*cpu_get(processorid_t cpun);	/* get the CPU struct associated */
+
+int	cpu_online(cpu_t *cp);			/* take cpu online */
+int	cpu_offline(cpu_t *cp, int flags);	/* take cpu offline */
+int	cpu_spare(cpu_t *cp, int flags);	/* take cpu to spare */
+int	cpu_faulted(cpu_t *cp, int flags);	/* take cpu to faulted */
+int	cpu_poweron(cpu_t *cp);		/* take powered-off cpu to offline */
+int	cpu_poweroff(cpu_t *cp);	/* take offline cpu to powered-off */
+
+cpu_t	*cpu_intr_next(cpu_t *cp);	/* get next online CPU taking intrs */
+int	cpu_intr_count(cpu_t *cp);	/* count # of CPUs handling intrs */
+int	cpu_intr_on(cpu_t *cp);		/* CPU taking I/O interrupts? */
+void	cpu_intr_enable(cpu_t *cp);	/* enable I/O interrupts */
+int	cpu_intr_disable(cpu_t *cp);	/* disable I/O interrupts */
+void	cpu_intr_alloc(cpu_t *cp, int n); /* allocate interrupt threads */
+
+/*
+ * Routines for checking CPU states.
+ */
+int	cpu_is_online(cpu_t *);		/* check if CPU is online */
+int	cpu_is_nointr(cpu_t *);		/* check if CPU can service intrs */
+int	cpu_is_active(cpu_t *);		/* check if CPU can run threads */
+int	cpu_is_offline(cpu_t *);	/* check if CPU is offline */
+int	cpu_is_poweredoff(cpu_t *);	/* check if CPU is powered off */
+
+int	cpu_flagged_online(cpu_flag_t);	/* flags show CPU is online */
+int	cpu_flagged_nointr(cpu_flag_t);	/* flags show CPU not handling intrs */
+int	cpu_flagged_active(cpu_flag_t); /* flags show CPU scheduling threads */
+int	cpu_flagged_offline(cpu_flag_t); /* flags show CPU is offline */
+int	cpu_flagged_poweredoff(cpu_flag_t); /* flags show CPU is powered off */
+
+/*
+ * The processor_info(2) state of a CPU is a simplified representation suitable
+ * for use by an application program.  Kernel subsystems should utilize the
+ * internal per-CPU state as given by the cpu_flags member of the cpu structure,
+ * as this information may include platform- or architecture-specific state
+ * critical to a subsystem's disposition of a particular CPU.
+ */
+void	cpu_set_state(cpu_t *);		/* record/timestamp current state */
+int	cpu_get_state(cpu_t *);		/* get current cpu state */
+const char *cpu_get_state_str(cpu_t *);	/* get current cpu state as string */
+
+
+void	cpu_set_supp_freqs(cpu_t *, const char *); /* set the CPU supported */
+						/* frequencies */
+
+int	cpu_configure(int);
+int	cpu_unconfigure(int);
+void	cpu_destroy_bound_threads(cpu_t *cp);
+
+extern int cpu_bind_thread(kthread_t *tp, processorid_t bind,
+    processorid_t *obind, int *error);
+extern int cpu_unbind(processorid_t cpu_id);
+extern void thread_affinity_set(kthread_t *t, int cpu_id);
+extern void thread_affinity_clear(kthread_t *t);
+extern void affinity_set(int cpu_id);
+extern void affinity_clear(void);
+extern void init_cpu_mstate(struct cpu *, int);
+extern void term_cpu_mstate(struct cpu *);
+extern void new_cpu_mstate(int, hrtime_t);
+extern void get_cpu_mstate(struct cpu *, hrtime_t *);
+extern void thread_nomigrate(void);
+extern void thread_allowmigrate(void);
+extern void weakbinding_stop(void);
+extern void weakbinding_start(void);
+
+/*
+ * The following routines affect the CPUs participation in interrupt processing,
+ * if that is applicable on the architecture.  This only affects interrupts
+ * which aren't directed at the processor (not cross calls).
+ *
+ * cpu_disable_intr returns non-zero if interrupts were previously enabled.
+ */
+int	cpu_disable_intr(struct cpu *cp); /* stop issuing interrupts to cpu */
+void	cpu_enable_intr(struct cpu *cp); /* start issuing interrupts to cpu */
+
+/*
+ * The mutex cpu_lock protects cpu_flags for all CPUs, as well as the ncpus
+ * and ncpus_online counts.
+ */
+extern kmutex_t	cpu_lock;	/* lock protecting CPU data */
+
+typedef enum {
+	CPU_INIT,
+	CPU_CONFIG,
+	CPU_UNCONFIG,
+	CPU_ON,
+	CPU_OFF,
+	CPU_CPUPART_IN,
+	CPU_CPUPART_OUT
+} cpu_setup_t;
+
+typedef int cpu_setup_func_t(cpu_setup_t, int, void *);
+
+/*
+ * Routines used to register interest in cpu's being added to or removed
+ * from the system.
+ */
+extern void register_cpu_setup_func(cpu_setup_func_t *, void *);
+extern void unregister_cpu_setup_func(cpu_setup_func_t *, void *);
+extern void cpu_state_change_notify(int, cpu_setup_t);
+
+/*
+ * Create various strings that describe the given CPU for the
+ * processor_info system call and configuration-related kstats.
+ */
+#define	CPU_IDSTRLEN	100
+
+extern void init_cpu_info(struct cpu *);
+extern void cpu_vm_data_init(struct cpu *);
+extern void cpu_vm_data_destroy(struct cpu *);
+
+#endif	/* _KERNEL */
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif /* _SYS_CPUVAR_H */
diff --git a/cddl/contrib/opensolaris/uts/common/sys/ctf.h b/cddl/contrib/opensolaris/uts/common/sys/ctf.h
new file mode 100644
index 0000000..065e985
--- /dev/null
+++ b/cddl/contrib/opensolaris/uts/common/sys/ctf.h
@@ -0,0 +1,358 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef	_CTF_H
+#define	_CTF_H
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <sys/types.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/*
+ * CTF - Compact ANSI-C Type Format
+ *
+ * This file format can be used to compactly represent the information needed
+ * by a debugger to interpret the ANSI-C types used by a given program.
+ * Traditionally, this kind of information is generated by the compiler when
+ * invoked with the -g flag and is stored in "stabs" strings or in the more
+ * modern DWARF format.  CTF provides a representation of only the information
+ * that is relevant to debugging a complex, optimized C program such as the
+ * operating system kernel in a form that is significantly more compact than
+ * the equivalent stabs or DWARF representation.  The format is data-model
+ * independent, so consumers do not need different code depending on whether
+ * they are 32-bit or 64-bit programs.  CTF assumes that a standard ELF symbol
+ * table is available for use in the debugger, and uses the structure and data
+ * of the symbol table to avoid storing redundant information.  The CTF data
+ * may be compressed on disk or in memory, indicated by a bit in the header.
+ * CTF may be interpreted in a raw disk file, or it may be stored in an ELF
+ * section, typically named .SUNW_ctf.  Data structures are aligned so that
+ * a raw CTF file or CTF ELF section may be manipulated using mmap(2).
+ *
+ * The CTF file or section itself has the following structure:
+ *
+ * +--------+--------+---------+----------+-------+--------+
+ * |  file  |  type  |  data   | function | data  | string |
+ * | header | labels | objects |   info   | types | table  |
+ * +--------+--------+---------+----------+-------+--------+
+ *
+ * The file header stores a magic number and version information, encoding
+ * flags, and the byte offset of each of the sections relative to the end of the
+ * header itself.  If the CTF data has been uniquified against another set of
+ * CTF data, a reference to that data also appears in the the header.  This
+ * reference is the name of the label corresponding to the types uniquified
+ * against.
+ *
+ * Following the header is a list of labels, used to group the types included in
+ * the data types section.  Each label is accompanied by a type ID i.  A given
+ * label refers to the group of types whose IDs are in the range [0, i].
+ *
+ * Data object and function records are stored in the same order as they appear
+ * in the corresponding symbol table, except that symbols marked SHN_UNDEF are
+ * not stored and symbols that have no type data are padded out with zeroes.
+ * For each data object, the type ID (a small integer) is recorded.  For each
+ * function, the type ID of the return type and argument types is recorded.
+ *
+ * The data types section is a list of variable size records that represent each
+ * type, in order by their ID.  The types themselves form a directed graph,
+ * where each node may contain one or more outgoing edges to other type nodes,
+ * denoted by their ID.
+ *
+ * Strings are recorded as a string table ID (0 or 1) and a byte offset into the
+ * string table.  String table 0 is the internal CTF string table.  String table
+ * 1 is the external string table, which is the string table associated with the
+ * ELF symbol table for this object.  CTF does not record any strings that are
+ * already in the symbol table, and the CTF string table does not contain any
+ * duplicated strings.
+ *
+ * If the CTF data has been merged with another parent CTF object, some outgoing
+ * edges may refer to type nodes that exist in another CTF object.  The debugger
+ * and libctf library are responsible for connecting the appropriate objects
+ * together so that the full set of types can be explored and manipulated.
+ */
+
+#define	CTF_MAX_TYPE	0xffff	/* max type identifier value */
+#define	CTF_MAX_NAME 0x7fffffff	/* max offset into a string table */
+#define	CTF_MAX_VLEN	0x3ff	/* max struct, union, enum members or args */
+#define	CTF_MAX_INTOFF	0xff	/* max offset of intrinsic value in bits */
+#define	CTF_MAX_INTBITS	0xffff	/* max size of an intrinsic in bits */
+
+/* See ctf_type_t */
+#define	CTF_MAX_SIZE	0xfffe	/* max size of a type in bytes */
+#define	CTF_LSIZE_SENT	0xffff	/* sentinel for ctt_size */
+#define	CTF_MAX_LSIZE	UINT64_MAX
+
+typedef struct ctf_preamble {
+	ushort_t ctp_magic;	/* magic number (CTF_MAGIC) */
+	uchar_t ctp_version;	/* data format version number (CTF_VERSION) */
+	uchar_t ctp_flags;	/* flags (see below) */
+} ctf_preamble_t;
+
+typedef struct ctf_header {
+	ctf_preamble_t cth_preamble;
+	uint_t cth_parlabel;	/* ref to name of parent lbl uniq'd against */
+	uint_t cth_parname;	/* ref to basename of parent */
+	uint_t cth_lbloff;	/* offset of label section */
+	uint_t cth_objtoff;	/* offset of object section */
+	uint_t cth_funcoff;	/* offset of function section */
+	uint_t cth_typeoff;	/* offset of type section */
+	uint_t cth_stroff;	/* offset of string section */
+	uint_t cth_strlen;	/* length of string section in bytes */
+} ctf_header_t;
+
+#define	cth_magic   cth_preamble.ctp_magic
+#define	cth_version cth_preamble.ctp_version
+#define	cth_flags   cth_preamble.ctp_flags
+
+#ifdef CTF_OLD_VERSIONS
+
+typedef struct ctf_header_v1 {
+	ctf_preamble_t cth_preamble;
+	uint_t cth_objtoff;
+	uint_t cth_funcoff;
+	uint_t cth_typeoff;
+	uint_t cth_stroff;
+	uint_t cth_strlen;
+} ctf_header_v1_t;
+
+#endif /* CTF_OLD_VERSIONS */
+
+#define	CTF_MAGIC	0xcff1	/* magic number identifying header */
+
+/* data format version number */
+#define	CTF_VERSION_1	1
+#define	CTF_VERSION_2	2
+#define	CTF_VERSION	CTF_VERSION_2	/* current version */
+
+#define	CTF_F_COMPRESS	0x1	/* data buffer is compressed */
+
+typedef struct ctf_lblent {
+	uint_t ctl_label;	/* ref to name of label */
+	uint_t ctl_typeidx;	/* last type associated with this label */
+} ctf_lblent_t;
+
+typedef struct ctf_stype {
+	uint_t ctt_name;	/* reference to name in string table */
+	ushort_t ctt_info;	/* encoded kind, variant length (see below) */
+	union {
+		ushort_t _size;	/* size of entire type in bytes */
+		ushort_t _type;	/* reference to another type */
+	} _u;
+} ctf_stype_t;
+
+/*
+ * type sizes, measured in bytes, come in two flavors.  99% of them fit within
+ * (USHRT_MAX - 1), and thus can be stored in the ctt_size member of a
+ * ctf_stype_t.  The maximum value for these sizes is CTF_MAX_SIZE.  The sizes
+ * larger than CTF_MAX_SIZE must be stored in the ctt_lsize member of a
+ * ctf_type_t.  Use of this member is indicated by the presence of
+ * CTF_LSIZE_SENT in ctt_size.
+ */
+typedef struct ctf_type {
+	uint_t ctt_name;	/* reference to name in string table */
+	ushort_t ctt_info;	/* encoded kind, variant length (see below) */
+	union {
+		ushort_t _size;	/* always CTF_LSIZE_SENT */
+		ushort_t _type; /* do not use */
+	} _u;
+	uint_t ctt_lsizehi;	/* high 32 bits of type size in bytes */
+	uint_t ctt_lsizelo;	/* low 32 bits of type size in bytes */
+} ctf_type_t;
+
+#define	ctt_size _u._size	/* for fundamental types that have a size */
+#define	ctt_type _u._type	/* for types that reference another type */
+
+/*
+ * The following macros compose and decompose values for ctt_info and
+ * ctt_name, as well as other structures that contain name references.
+ *
+ *             ------------------------
+ * ctt_info:   | kind | isroot | vlen |
+ *             ------------------------
+ *             15   11    10    9     0
+ *
+ * kind = CTF_INFO_KIND(c.ctt_info);     <-- CTF_K_* value (see below)
+ * vlen = CTF_INFO_VLEN(c.ctt_info);     <-- length of variable data list
+ *
+ * stid = CTF_NAME_STID(c.ctt_name);     <-- string table id number (0 or 1)
+ * offset = CTF_NAME_OFFSET(c.ctt_name); <-- string table byte offset
+ *
+ * c.ctt_info = CTF_TYPE_INFO(kind, vlen);
+ * c.ctt_name = CTF_TYPE_NAME(stid, offset);
+ */
+
+#define	CTF_INFO_KIND(info)	(((info) & 0xf800) >> 11)
+#define	CTF_INFO_ISROOT(info)	(((info) & 0x0400) >> 10)
+#define	CTF_INFO_VLEN(info)	(((info) & CTF_MAX_VLEN))
+
+#define	CTF_NAME_STID(name)	((name) >> 31)
+#define	CTF_NAME_OFFSET(name)	((name) & 0x7fffffff)
+
+#define	CTF_TYPE_INFO(kind, isroot, vlen) \
+	(((kind) << 11) | (((isroot) ? 1 : 0) << 10) | ((vlen) & CTF_MAX_VLEN))
+
+#define	CTF_TYPE_NAME(stid, offset) \
+	(((stid) << 31) | ((offset) & 0x7fffffff))
+
+#define	CTF_TYPE_ISPARENT(id)	((id) < 0x8000)
+#define	CTF_TYPE_ISCHILD(id)	((id) > 0x7fff)
+
+#define	CTF_TYPE_TO_INDEX(id)		((id) & 0x7fff)
+#define	CTF_INDEX_TO_TYPE(id, child)	((child) ? ((id) | 0x8000) : (id))
+#define	CTF_PARENT_SHIFT	15
+
+#define	CTF_STRTAB_0	0	/* symbolic define for string table id 0 */
+#define	CTF_STRTAB_1	1	/* symbolic define for string table id 1 */
+
+#define	CTF_TYPE_LSIZE(cttp) \
+	(((uint64_t)(cttp)->ctt_lsizehi) << 32 | (cttp)->ctt_lsizelo)
+#define	CTF_SIZE_TO_LSIZE_HI(size)	((uint32_t)((uint64_t)(size) >> 32))
+#define	CTF_SIZE_TO_LSIZE_LO(size)	((uint32_t)(size))
+
+#ifdef CTF_OLD_VERSIONS
+
+#define	CTF_INFO_KIND_V1(info)		(((info) & 0xf000) >> 12)
+#define	CTF_INFO_ISROOT_V1(info)	(((info) & 0x0800) >> 11)
+#define	CTF_INFO_VLEN_V1(info)		(((info) & 0x07ff))
+
+#define	CTF_TYPE_INFO_V1(kind, isroot, vlen) \
+	(((kind) << 12) | (((isroot) ? 1 : 0) << 11) | ((vlen) & 0x07ff))
+
+#endif /* CTF_OLD_VERSIONS */
+
+/*
+ * Values for CTF_TYPE_KIND().  If the kind has an associated data list,
+ * CTF_INFO_VLEN() will extract the number of elements in the list, and
+ * the type of each element is shown in the comments below.
+ */
+#define	CTF_K_UNKNOWN	0	/* unknown type (used for padding) */
+#define	CTF_K_INTEGER	1	/* variant data is CTF_INT_DATA() (see below) */
+#define	CTF_K_FLOAT	2	/* variant data is CTF_FP_DATA() (see below) */
+#define	CTF_K_POINTER	3	/* ctt_type is referenced type */
+#define	CTF_K_ARRAY	4	/* variant data is single ctf_array_t */
+#define	CTF_K_FUNCTION	5	/* ctt_type is return type, variant data is */
+				/* list of argument types (ushort_t's) */
+#define	CTF_K_STRUCT	6	/* variant data is list of ctf_member_t's */
+#define	CTF_K_UNION	7	/* variant data is list of ctf_member_t's */
+#define	CTF_K_ENUM	8	/* variant data is list of ctf_enum_t's */
+#define	CTF_K_FORWARD	9	/* no additional data; ctt_name is tag */
+#define	CTF_K_TYPEDEF	10	/* ctt_type is referenced type */
+#define	CTF_K_VOLATILE	11	/* ctt_type is base type */
+#define	CTF_K_CONST	12	/* ctt_type is base type */
+#define	CTF_K_RESTRICT	13	/* ctt_type is base type */
+
+#define	CTF_K_MAX	31	/* Maximum possible CTF_K_* value */
+
+/*
+ * Values for ctt_type when kind is CTF_K_INTEGER.  The flags, offset in bits,
+ * and size in bits are encoded as a single word using the following macros.
+ */
+#define	CTF_INT_ENCODING(data)	(((data) & 0xff000000) >> 24)
+#define	CTF_INT_OFFSET(data)	(((data) & 0x00ff0000) >> 16)
+#define	CTF_INT_BITS(data)	(((data) & 0x0000ffff))
+
+#define	CTF_INT_DATA(encoding, offset, bits) \
+	(((encoding) << 24) | ((offset) << 16) | (bits))
+
+#define	CTF_INT_SIGNED	0x01	/* integer is signed (otherwise unsigned) */
+#define	CTF_INT_CHAR	0x02	/* character display format */
+#define	CTF_INT_BOOL	0x04	/* boolean display format */
+#define	CTF_INT_VARARGS	0x08	/* varargs display format */
+
+/*
+ * Values for ctt_type when kind is CTF_K_FLOAT.  The encoding, offset in bits,
+ * and size in bits are encoded as a single word using the following macros.
+ */
+#define	CTF_FP_ENCODING(data)	(((data) & 0xff000000) >> 24)
+#define	CTF_FP_OFFSET(data)	(((data) & 0x00ff0000) >> 16)
+#define	CTF_FP_BITS(data)	(((data) & 0x0000ffff))
+
+#define	CTF_FP_DATA(encoding, offset, bits) \
+	(((encoding) << 24) | ((offset) << 16) | (bits))
+
+#define	CTF_FP_SINGLE	1	/* IEEE 32-bit float encoding */
+#define	CTF_FP_DOUBLE	2	/* IEEE 64-bit float encoding */
+#define	CTF_FP_CPLX	3	/* Complex encoding */
+#define	CTF_FP_DCPLX	4	/* Double complex encoding */
+#define	CTF_FP_LDCPLX	5	/* Long double complex encoding */
+#define	CTF_FP_LDOUBLE	6	/* Long double encoding */
+#define	CTF_FP_INTRVL	7	/* Interval (2x32-bit) encoding */
+#define	CTF_FP_DINTRVL	8	/* Double interval (2x64-bit) encoding */
+#define	CTF_FP_LDINTRVL	9	/* Long double interval (2x128-bit) encoding */
+#define	CTF_FP_IMAGRY	10	/* Imaginary (32-bit) encoding */
+#define	CTF_FP_DIMAGRY	11	/* Long imaginary (64-bit) encoding */
+#define	CTF_FP_LDIMAGRY	12	/* Long double imaginary (128-bit) encoding */
+
+#define	CTF_FP_MAX	12	/* Maximum possible CTF_FP_* value */
+
+typedef struct ctf_array {
+	ushort_t cta_contents;	/* reference to type of array contents */
+	ushort_t cta_index;	/* reference to type of array index */
+	uint_t cta_nelems;	/* number of elements */
+} ctf_array_t;
+
+/*
+ * Most structure members have bit offsets that can be expressed using a
+ * short.  Some don't.  ctf_member_t is used for structs which cannot
+ * contain any of these large offsets, whereas ctf_lmember_t is used in the
+ * latter case.  If ctt_size for a given struct is >= 8192 bytes, all members
+ * will be stored as type ctf_lmember_t.
+ */
+
+#define	CTF_LSTRUCT_THRESH	8192
+
+typedef struct ctf_member {
+	uint_t ctm_name;	/* reference to name in string table */
+	ushort_t ctm_type;	/* reference to type of member */
+	ushort_t ctm_offset;	/* offset of this member in bits */
+} ctf_member_t;
+
+typedef struct ctf_lmember {
+	uint_t ctlm_name;	/* reference to name in string table */
+	ushort_t ctlm_type;	/* reference to type of member */
+	ushort_t ctlm_pad;	/* padding */
+	uint_t ctlm_offsethi;	/* high 32 bits of member offset in bits */
+	uint_t ctlm_offsetlo;	/* low 32 bits of member offset in bits */
+} ctf_lmember_t;
+
+#define	CTF_LMEM_OFFSET(ctlmp) \
+	(((uint64_t)(ctlmp)->ctlm_offsethi) << 32 | (ctlmp)->ctlm_offsetlo)
+#define	CTF_OFFSET_TO_LMEMHI(offset)	((uint32_t)((uint64_t)(offset) >> 32))
+#define	CTF_OFFSET_TO_LMEMLO(offset)	((uint32_t)(offset))
+
+typedef struct ctf_enum {
+	uint_t cte_name;	/* reference to name in string table */
+	int cte_value;		/* value associated with this name */
+} ctf_enum_t;
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* _CTF_H */
diff --git a/cddl/contrib/opensolaris/uts/common/sys/ctf_api.h b/cddl/contrib/opensolaris/uts/common/sys/ctf_api.h
new file mode 100644
index 0000000..17b0b72
--- /dev/null
+++ b/cddl/contrib/opensolaris/uts/common/sys/ctf_api.h
@@ -0,0 +1,241 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+/*
+ * This header file defines the interfaces available from the CTF debugger
+ * library, libctf, and an equivalent kernel module.  This API can be used by
+ * a debugger to operate on data in the Compact ANSI-C Type Format (CTF).
+ * This is NOT a public interface, although it may eventually become one in
+ * the fullness of time after we gain more experience with the interfaces.
+ *
+ * In the meantime, be aware that any program linked with this API in this
+ * release of Solaris is almost guaranteed to break in the next release.
+ *
+ * In short, do not user this header file or the CTF routines for any purpose.
+ */
+
+#ifndef	_CTF_API_H
+#define	_CTF_API_H
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/elf.h>
+#include <sys/ctf.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/*
+ * Clients can open one or more CTF containers and obtain a pointer to an
+ * opaque ctf_file_t.  Types are identified by an opaque ctf_id_t token.
+ * These opaque definitions allow libctf to evolve without breaking clients.
+ */
+typedef struct ctf_file ctf_file_t;
+typedef long ctf_id_t;
+
+/*
+ * If the debugger needs to provide the CTF library with a set of raw buffers
+ * for use as the CTF data, symbol table, and string table, it can do so by
+ * filling in ctf_sect_t structures and passing them to ctf_bufopen():
+ */
+typedef struct ctf_sect {
+	const char *cts_name;	/* section name (if any) */
+	ulong_t cts_type;	/* section type (ELF SHT_... value) */
+	ulong_t cts_flags;	/* section flags (ELF SHF_... value) */
+	const void *cts_data;	/* pointer to section data */
+	size_t cts_size;	/* size of data in bytes */
+	size_t cts_entsize;	/* size of each section entry (symtab only) */
+	off64_t cts_offset;	/* file offset of this section (if any) */
+} ctf_sect_t;
+
+/*
+ * Encoding information for integers, floating-point values, and certain other
+ * intrinsics can be obtained by calling ctf_type_encoding(), below.  The flags
+ * field will contain values appropriate for the type defined in <sys/ctf.h>.
+ */
+typedef struct ctf_encoding {
+	uint_t cte_format;	/* data format (CTF_INT_* or CTF_FP_* flags) */
+	uint_t cte_offset;	/* offset of value in bits */
+	uint_t cte_bits;	/* size of storage in bits */
+} ctf_encoding_t;
+
+typedef struct ctf_membinfo {
+	ctf_id_t ctm_type;	/* type of struct or union member */
+	ulong_t ctm_offset;	/* offset of member in bits */
+} ctf_membinfo_t;
+
+typedef struct ctf_arinfo {
+	ctf_id_t ctr_contents;	/* type of array contents */
+	ctf_id_t ctr_index;	/* type of array index */
+	uint_t ctr_nelems;	/* number of elements */
+} ctf_arinfo_t;
+
+typedef struct ctf_funcinfo {
+	ctf_id_t ctc_return;	/* function return type */
+	uint_t ctc_argc;	/* number of typed arguments to function */
+	uint_t ctc_flags;	/* function attributes (see below) */
+} ctf_funcinfo_t;
+
+typedef struct ctf_lblinfo {
+	ctf_id_t ctb_typeidx;	/* last type associated with the label */
+} ctf_lblinfo_t;
+
+#define	CTF_FUNC_VARARG	0x1	/* function arguments end with varargs */
+
+/*
+ * Functions that return integer status or a ctf_id_t use the following value
+ * to indicate failure.  ctf_errno() can be used to obtain an error code.
+ */
+#define	CTF_ERR	(-1L)
+
+/*
+ * The CTF data model is inferred to be the caller's data model or the data
+ * model of the given object, unless ctf_setmodel() is explicitly called.
+ */
+#define	CTF_MODEL_ILP32	1	/* object data model is ILP32 */
+#define	CTF_MODEL_LP64	2	/* object data model is LP64 */
+#ifdef _LP64
+#define	CTF_MODEL_NATIVE	CTF_MODEL_LP64
+#else
+#define	CTF_MODEL_NATIVE	CTF_MODEL_ILP32
+#endif
+
+/*
+ * Dynamic CTF containers can be created using ctf_create().  The ctf_add_*
+ * routines can be used to add new definitions to the dynamic container.
+ * New types are labeled as root or non-root to determine whether they are
+ * visible at the top-level program scope when subsequently doing a lookup.
+ */
+#define	CTF_ADD_NONROOT	0	/* type only visible in nested scope */
+#define	CTF_ADD_ROOT	1	/* type visible at top-level scope */
+
+/*
+ * These typedefs are used to define the signature for callback functions
+ * that can be used with the iteration and visit functions below:
+ */
+typedef int ctf_visit_f(const char *, ctf_id_t, ulong_t, int, void *);
+typedef int ctf_member_f(const char *, ctf_id_t, ulong_t, void *);
+typedef int ctf_enum_f(const char *, int, void *);
+typedef int ctf_type_f(ctf_id_t, void *);
+typedef int ctf_label_f(const char *, const ctf_lblinfo_t *, void *);
+
+extern ctf_file_t *ctf_bufopen(const ctf_sect_t *, const ctf_sect_t *,
+    const ctf_sect_t *, int *);
+extern ctf_file_t *ctf_fdopen(int, int *);
+extern ctf_file_t *ctf_open(const char *, int *);
+extern ctf_file_t *ctf_create(int *);
+extern void ctf_close(ctf_file_t *);
+
+extern ctf_file_t *ctf_parent_file(ctf_file_t *);
+extern const char *ctf_parent_name(ctf_file_t *);
+
+extern int ctf_import(ctf_file_t *, ctf_file_t *);
+extern int ctf_setmodel(ctf_file_t *, int);
+extern int ctf_getmodel(ctf_file_t *);
+
+extern void ctf_setspecific(ctf_file_t *, void *);
+extern void *ctf_getspecific(ctf_file_t *);
+
+extern int ctf_errno(ctf_file_t *);
+extern const char *ctf_errmsg(int);
+extern int ctf_version(int);
+
+extern int ctf_func_info(ctf_file_t *, ulong_t, ctf_funcinfo_t *);
+extern int ctf_func_args(ctf_file_t *, ulong_t, uint_t, ctf_id_t *);
+
+extern ctf_id_t ctf_lookup_by_name(ctf_file_t *, const char *);
+extern ctf_id_t ctf_lookup_by_symbol(ctf_file_t *, ulong_t);
+
+extern ctf_id_t ctf_type_resolve(ctf_file_t *, ctf_id_t);
+extern ssize_t ctf_type_lname(ctf_file_t *, ctf_id_t, char *, size_t);
+extern char *ctf_type_name(ctf_file_t *, ctf_id_t, char *, size_t);
+extern ssize_t ctf_type_size(ctf_file_t *, ctf_id_t);
+extern ssize_t ctf_type_align(ctf_file_t *, ctf_id_t);
+extern int ctf_type_kind(ctf_file_t *, ctf_id_t);
+extern ctf_id_t ctf_type_reference(ctf_file_t *, ctf_id_t);
+extern ctf_id_t ctf_type_pointer(ctf_file_t *, ctf_id_t);
+extern int ctf_type_encoding(ctf_file_t *, ctf_id_t, ctf_encoding_t *);
+extern int ctf_type_visit(ctf_file_t *, ctf_id_t, ctf_visit_f *, void *);
+extern int ctf_type_cmp(ctf_file_t *, ctf_id_t, ctf_file_t *, ctf_id_t);
+extern int ctf_type_compat(ctf_file_t *, ctf_id_t, ctf_file_t *, ctf_id_t);
+
+extern int ctf_member_info(ctf_file_t *, ctf_id_t, const char *,
+    ctf_membinfo_t *);
+extern int ctf_array_info(ctf_file_t *, ctf_id_t, ctf_arinfo_t *);
+
+extern const char *ctf_enum_name(ctf_file_t *, ctf_id_t, int);
+extern int ctf_enum_value(ctf_file_t *, ctf_id_t, const char *, int *);
+
+extern const char *ctf_label_topmost(ctf_file_t *);
+extern int ctf_label_info(ctf_file_t *, const char *, ctf_lblinfo_t *);
+
+extern int ctf_member_iter(ctf_file_t *, ctf_id_t, ctf_member_f *, void *);
+extern int ctf_enum_iter(ctf_file_t *, ctf_id_t, ctf_enum_f *, void *);
+extern int ctf_type_iter(ctf_file_t *, ctf_type_f *, void *);
+extern int ctf_label_iter(ctf_file_t *, ctf_label_f *, void *);
+
+extern ctf_id_t ctf_add_array(ctf_file_t *, uint_t, const ctf_arinfo_t *);
+extern ctf_id_t ctf_add_const(ctf_file_t *, uint_t, ctf_id_t);
+extern ctf_id_t ctf_add_enum(ctf_file_t *, uint_t, const char *);
+extern ctf_id_t ctf_add_float(ctf_file_t *, uint_t,
+    const char *, const ctf_encoding_t *);
+extern ctf_id_t ctf_add_forward(ctf_file_t *, uint_t, const char *, uint_t);
+extern ctf_id_t ctf_add_function(ctf_file_t *, uint_t,
+    const ctf_funcinfo_t *, const ctf_id_t *);
+extern ctf_id_t ctf_add_integer(ctf_file_t *, uint_t,
+    const char *, const ctf_encoding_t *);
+extern ctf_id_t ctf_add_pointer(ctf_file_t *, uint_t, ctf_id_t);
+extern ctf_id_t ctf_add_type(ctf_file_t *, ctf_file_t *, ctf_id_t);
+extern ctf_id_t ctf_add_typedef(ctf_file_t *, uint_t, const char *, ctf_id_t);
+extern ctf_id_t ctf_add_restrict(ctf_file_t *, uint_t, ctf_id_t);
+extern ctf_id_t ctf_add_struct(ctf_file_t *, uint_t, const char *);
+extern ctf_id_t ctf_add_union(ctf_file_t *, uint_t, const char *);
+extern ctf_id_t ctf_add_volatile(ctf_file_t *, uint_t, ctf_id_t);
+
+extern int ctf_add_enumerator(ctf_file_t *, ctf_id_t, const char *, int);
+extern int ctf_add_member(ctf_file_t *, ctf_id_t, const char *, ctf_id_t);
+
+extern int ctf_set_array(ctf_file_t *, ctf_id_t, const ctf_arinfo_t *);
+
+extern int ctf_update(ctf_file_t *);
+extern int ctf_discard(ctf_file_t *);
+extern int ctf_write(ctf_file_t *, int);
+
+#ifdef _KERNEL
+
+struct module;
+extern ctf_file_t *ctf_modopen(struct module *, int *);
+
+#endif
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* _CTF_API_H */
diff --git a/cddl/contrib/opensolaris/uts/common/sys/dtrace.h b/cddl/contrib/opensolaris/uts/common/sys/dtrace.h
new file mode 100644
index 0000000..b6e52ec
--- /dev/null
+++ b/cddl/contrib/opensolaris/uts/common/sys/dtrace.h
@@ -0,0 +1,2242 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef _SYS_DTRACE_H
+#define	_SYS_DTRACE_H
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/*
+ * DTrace Dynamic Tracing Software: Kernel Interfaces
+ *
+ * Note: The contents of this file are private to the implementation of the
+ * Solaris system and DTrace subsystem and are subject to change at any time
+ * without notice.  Applications and drivers using these interfaces will fail
+ * to run on future releases.  These interfaces should not be used for any
+ * purpose except those expressly outlined in dtrace(7D) and libdtrace(3LIB).
+ * Please refer to the "Solaris Dynamic Tracing Guide" for more information.
+ */
+
+#ifndef _ASM
+
+#include <sys/types.h>
+#include <sys/modctl.h>
+#include <sys/processor.h>
+#include <sys/systm.h>
+#include <sys/ctf_api.h>
+#include <sys/cyclic.h>
+#include <sys/int_limits.h>
+
+/*
+ * DTrace Universal Constants and Typedefs
+ */
+#define	DTRACE_CPUALL		-1	/* all CPUs */
+#define	DTRACE_IDNONE		0	/* invalid probe identifier */
+#define	DTRACE_EPIDNONE		0	/* invalid enabled probe identifier */
+#define	DTRACE_AGGIDNONE	0	/* invalid aggregation identifier */
+#define	DTRACE_AGGVARIDNONE	0	/* invalid aggregation variable ID */
+#define	DTRACE_CACHEIDNONE	0	/* invalid predicate cache */
+#define	DTRACE_PROVNONE		0	/* invalid provider identifier */
+#define	DTRACE_METAPROVNONE	0	/* invalid meta-provider identifier */
+#define	DTRACE_ARGNONE		-1	/* invalid argument index */
+
+#define	DTRACE_PROVNAMELEN	64
+#define	DTRACE_MODNAMELEN	64
+#define	DTRACE_FUNCNAMELEN	128
+#define	DTRACE_NAMELEN		64
+#define	DTRACE_FULLNAMELEN	(DTRACE_PROVNAMELEN + DTRACE_MODNAMELEN + \
+				DTRACE_FUNCNAMELEN + DTRACE_NAMELEN + 4)
+#define	DTRACE_ARGTYPELEN	128
+
+typedef uint32_t dtrace_id_t;		/* probe identifier */
+typedef uint32_t dtrace_epid_t;		/* enabled probe identifier */
+typedef uint32_t dtrace_aggid_t;	/* aggregation identifier */
+typedef int64_t dtrace_aggvarid_t;	/* aggregation variable identifier */
+typedef uint16_t dtrace_actkind_t;	/* action kind */
+typedef int64_t dtrace_optval_t;	/* option value */
+typedef uint32_t dtrace_cacheid_t;	/* predicate cache identifier */
+
+typedef enum dtrace_probespec {
+	DTRACE_PROBESPEC_NONE = -1,
+	DTRACE_PROBESPEC_PROVIDER = 0,
+	DTRACE_PROBESPEC_MOD,
+	DTRACE_PROBESPEC_FUNC,
+	DTRACE_PROBESPEC_NAME
+} dtrace_probespec_t;
+
+/*
+ * DTrace Intermediate Format (DIF)
+ *
+ * The following definitions describe the DTrace Intermediate Format (DIF), a
+ * a RISC-like instruction set and program encoding used to represent
+ * predicates and actions that can be bound to DTrace probes.  The constants
+ * below defining the number of available registers are suggested minimums; the
+ * compiler should use DTRACEIOC_CONF to dynamically obtain the number of
+ * registers provided by the current DTrace implementation.
+ */
+#define	DIF_VERSION_1	1		/* DIF version 1: Solaris 10 Beta */
+#define	DIF_VERSION_2	2		/* DIF version 2: Solaris 10 FCS */
+#define	DIF_VERSION	DIF_VERSION_2	/* latest DIF instruction set version */
+#define	DIF_DIR_NREGS	8		/* number of DIF integer registers */
+#define	DIF_DTR_NREGS	8		/* number of DIF tuple registers */
+
+#define	DIF_OP_OR	1		/* or	r1, r2, rd */
+#define	DIF_OP_XOR	2		/* xor	r1, r2, rd */
+#define	DIF_OP_AND	3		/* and	r1, r2, rd */
+#define	DIF_OP_SLL	4		/* sll	r1, r2, rd */
+#define	DIF_OP_SRL	5		/* srl	r1, r2, rd */
+#define	DIF_OP_SUB	6		/* sub	r1, r2, rd */
+#define	DIF_OP_ADD	7		/* add	r1, r2, rd */
+#define	DIF_OP_MUL	8		/* mul	r1, r2, rd */
+#define	DIF_OP_SDIV	9		/* sdiv	r1, r2, rd */
+#define	DIF_OP_UDIV	10		/* udiv r1, r2, rd */
+#define	DIF_OP_SREM	11		/* srem r1, r2, rd */
+#define	DIF_OP_UREM	12		/* urem r1, r2, rd */
+#define	DIF_OP_NOT	13		/* not	r1, rd */
+#define	DIF_OP_MOV	14		/* mov	r1, rd */
+#define	DIF_OP_CMP	15		/* cmp	r1, r2 */
+#define	DIF_OP_TST	16		/* tst  r1 */
+#define	DIF_OP_BA	17		/* ba	label */
+#define	DIF_OP_BE	18		/* be	label */
+#define	DIF_OP_BNE	19		/* bne	label */
+#define	DIF_OP_BG	20		/* bg	label */
+#define	DIF_OP_BGU	21		/* bgu	label */
+#define	DIF_OP_BGE	22		/* bge	label */
+#define	DIF_OP_BGEU	23		/* bgeu	label */
+#define	DIF_OP_BL	24		/* bl	label */
+#define	DIF_OP_BLU	25		/* blu	label */
+#define	DIF_OP_BLE	26		/* ble	label */
+#define	DIF_OP_BLEU	27		/* bleu	label */
+#define	DIF_OP_LDSB	28		/* ldsb	[r1], rd */
+#define	DIF_OP_LDSH	29		/* ldsh	[r1], rd */
+#define	DIF_OP_LDSW	30		/* ldsw [r1], rd */
+#define	DIF_OP_LDUB	31		/* ldub	[r1], rd */
+#define	DIF_OP_LDUH	32		/* lduh	[r1], rd */
+#define	DIF_OP_LDUW	33		/* lduw	[r1], rd */
+#define	DIF_OP_LDX	34		/* ldx	[r1], rd */
+#define	DIF_OP_RET	35		/* ret	rd */
+#define	DIF_OP_NOP	36		/* nop */
+#define	DIF_OP_SETX	37		/* setx	intindex, rd */
+#define	DIF_OP_SETS	38		/* sets strindex, rd */
+#define	DIF_OP_SCMP	39		/* scmp	r1, r2 */
+#define	DIF_OP_LDGA	40		/* ldga	var, ri, rd */
+#define	DIF_OP_LDGS	41		/* ldgs var, rd */
+#define	DIF_OP_STGS	42		/* stgs var, rs */
+#define	DIF_OP_LDTA	43		/* ldta var, ri, rd */
+#define	DIF_OP_LDTS	44		/* ldts var, rd */
+#define	DIF_OP_STTS	45		/* stts var, rs */
+#define	DIF_OP_SRA	46		/* sra	r1, r2, rd */
+#define	DIF_OP_CALL	47		/* call	subr, rd */
+#define	DIF_OP_PUSHTR	48		/* pushtr type, rs, rr */
+#define	DIF_OP_PUSHTV	49		/* pushtv type, rs, rv */
+#define	DIF_OP_POPTS	50		/* popts */
+#define	DIF_OP_FLUSHTS	51		/* flushts */
+#define	DIF_OP_LDGAA	52		/* ldgaa var, rd */
+#define	DIF_OP_LDTAA	53		/* ldtaa var, rd */
+#define	DIF_OP_STGAA	54		/* stgaa var, rs */
+#define	DIF_OP_STTAA	55		/* sttaa var, rs */
+#define	DIF_OP_LDLS	56		/* ldls	var, rd */
+#define	DIF_OP_STLS	57		/* stls	var, rs */
+#define	DIF_OP_ALLOCS	58		/* allocs r1, rd */
+#define	DIF_OP_COPYS	59		/* copys  r1, r2, rd */
+#define	DIF_OP_STB	60		/* stb	r1, [rd] */
+#define	DIF_OP_STH	61		/* sth	r1, [rd] */
+#define	DIF_OP_STW	62		/* stw	r1, [rd] */
+#define	DIF_OP_STX	63		/* stx	r1, [rd] */
+#define	DIF_OP_ULDSB	64		/* uldsb [r1], rd */
+#define	DIF_OP_ULDSH	65		/* uldsh [r1], rd */
+#define	DIF_OP_ULDSW	66		/* uldsw [r1], rd */
+#define	DIF_OP_ULDUB	67		/* uldub [r1], rd */
+#define	DIF_OP_ULDUH	68		/* ulduh [r1], rd */
+#define	DIF_OP_ULDUW	69		/* ulduw [r1], rd */
+#define	DIF_OP_ULDX	70		/* uldx  [r1], rd */
+#define	DIF_OP_RLDSB	71		/* rldsb [r1], rd */
+#define	DIF_OP_RLDSH	72		/* rldsh [r1], rd */
+#define	DIF_OP_RLDSW	73		/* rldsw [r1], rd */
+#define	DIF_OP_RLDUB	74		/* rldub [r1], rd */
+#define	DIF_OP_RLDUH	75		/* rlduh [r1], rd */
+#define	DIF_OP_RLDUW	76		/* rlduw [r1], rd */
+#define	DIF_OP_RLDX	77		/* rldx  [r1], rd */
+#define	DIF_OP_XLATE	78		/* xlate xlrindex, rd */
+#define	DIF_OP_XLARG	79		/* xlarg xlrindex, rd */
+
+#define	DIF_INTOFF_MAX		0xffff	/* highest integer table offset */
+#define	DIF_STROFF_MAX		0xffff	/* highest string table offset */
+#define	DIF_REGISTER_MAX	0xff	/* highest register number */
+#define	DIF_VARIABLE_MAX	0xffff	/* highest variable identifier */
+#define	DIF_SUBROUTINE_MAX	0xffff	/* highest subroutine code */
+
+#define	DIF_VAR_ARRAY_MIN	0x0000	/* lowest numbered array variable */
+#define	DIF_VAR_ARRAY_UBASE	0x0080	/* lowest user-defined array */
+#define	DIF_VAR_ARRAY_MAX	0x00ff	/* highest numbered array variable */
+
+#define	DIF_VAR_OTHER_MIN	0x0100	/* lowest numbered scalar or assc */
+#define	DIF_VAR_OTHER_UBASE	0x0500	/* lowest user-defined scalar or assc */
+#define	DIF_VAR_OTHER_MAX	0xffff	/* highest numbered scalar or assc */
+
+#define	DIF_VAR_ARGS		0x0000	/* arguments array */
+#define	DIF_VAR_REGS		0x0001	/* registers array */
+#define	DIF_VAR_UREGS		0x0002	/* user registers array */
+#define	DIF_VAR_CURTHREAD	0x0100	/* thread pointer */
+#define	DIF_VAR_TIMESTAMP	0x0101	/* timestamp */
+#define	DIF_VAR_VTIMESTAMP	0x0102	/* virtual timestamp */
+#define	DIF_VAR_IPL		0x0103	/* interrupt priority level */
+#define	DIF_VAR_EPID		0x0104	/* enabled probe ID */
+#define	DIF_VAR_ID		0x0105	/* probe ID */
+#define	DIF_VAR_ARG0		0x0106	/* first argument */
+#define	DIF_VAR_ARG1		0x0107	/* second argument */
+#define	DIF_VAR_ARG2		0x0108	/* third argument */
+#define	DIF_VAR_ARG3		0x0109	/* fourth argument */
+#define	DIF_VAR_ARG4		0x010a	/* fifth argument */
+#define	DIF_VAR_ARG5		0x010b	/* sixth argument */
+#define	DIF_VAR_ARG6		0x010c	/* seventh argument */
+#define	DIF_VAR_ARG7		0x010d	/* eighth argument */
+#define	DIF_VAR_ARG8		0x010e	/* ninth argument */
+#define	DIF_VAR_ARG9		0x010f	/* tenth argument */
+#define	DIF_VAR_STACKDEPTH	0x0110	/* stack depth */
+#define	DIF_VAR_CALLER		0x0111	/* caller */
+#define	DIF_VAR_PROBEPROV	0x0112	/* probe provider */
+#define	DIF_VAR_PROBEMOD	0x0113	/* probe module */
+#define	DIF_VAR_PROBEFUNC	0x0114	/* probe function */
+#define	DIF_VAR_PROBENAME	0x0115	/* probe name */
+#define	DIF_VAR_PID		0x0116	/* process ID */
+#define	DIF_VAR_TID		0x0117	/* (per-process) thread ID */
+#define	DIF_VAR_EXECNAME	0x0118	/* name of executable */
+#define	DIF_VAR_ZONENAME	0x0119	/* zone name associated with process */
+#define	DIF_VAR_WALLTIMESTAMP	0x011a	/* wall-clock timestamp */
+#define	DIF_VAR_USTACKDEPTH	0x011b	/* user-land stack depth */
+#define	DIF_VAR_UCALLER		0x011c	/* user-level caller */
+#define	DIF_VAR_PPID		0x011d	/* parent process ID */
+#define	DIF_VAR_UID		0x011e	/* process user ID */
+#define	DIF_VAR_GID		0x011f	/* process group ID */
+#define	DIF_VAR_ERRNO		0x0120	/* thread errno */
+
+#define	DIF_SUBR_RAND			0
+#define	DIF_SUBR_MUTEX_OWNED		1
+#define	DIF_SUBR_MUTEX_OWNER		2
+#define	DIF_SUBR_MUTEX_TYPE_ADAPTIVE	3
+#define	DIF_SUBR_MUTEX_TYPE_SPIN	4
+#define	DIF_SUBR_RW_READ_HELD		5
+#define	DIF_SUBR_RW_WRITE_HELD		6
+#define	DIF_SUBR_RW_ISWRITER		7
+#define	DIF_SUBR_COPYIN			8
+#define	DIF_SUBR_COPYINSTR		9
+#define	DIF_SUBR_SPECULATION		10
+#define	DIF_SUBR_PROGENYOF		11
+#define	DIF_SUBR_STRLEN			12
+#define	DIF_SUBR_COPYOUT		13
+#define	DIF_SUBR_COPYOUTSTR		14
+#define	DIF_SUBR_ALLOCA			15
+#define	DIF_SUBR_BCOPY			16
+#define	DIF_SUBR_COPYINTO		17
+#define	DIF_SUBR_MSGDSIZE		18
+#define	DIF_SUBR_MSGSIZE		19
+#define	DIF_SUBR_GETMAJOR		20
+#define	DIF_SUBR_GETMINOR		21
+#define	DIF_SUBR_DDI_PATHNAME		22
+#define	DIF_SUBR_STRJOIN		23
+#define	DIF_SUBR_LLTOSTR		24
+#define	DIF_SUBR_BASENAME		25
+#define	DIF_SUBR_DIRNAME		26
+#define	DIF_SUBR_CLEANPATH		27
+#define	DIF_SUBR_STRCHR			28
+#define	DIF_SUBR_STRRCHR		29
+#define	DIF_SUBR_STRSTR			30
+#define	DIF_SUBR_STRTOK			31
+#define	DIF_SUBR_SUBSTR			32
+#define	DIF_SUBR_INDEX			33
+#define	DIF_SUBR_RINDEX			34
+#define	DIF_SUBR_HTONS			35
+#define	DIF_SUBR_HTONL			36
+#define	DIF_SUBR_HTONLL			37
+#define	DIF_SUBR_NTOHS			38
+#define	DIF_SUBR_NTOHL			39
+#define	DIF_SUBR_NTOHLL			40
+#define	DIF_SUBR_INET_NTOP		41
+#define	DIF_SUBR_INET_NTOA		42
+#define	DIF_SUBR_INET_NTOA6		43
+
+#define	DIF_SUBR_MAX			43	/* max subroutine value */
+
+typedef uint32_t dif_instr_t;
+
+#define	DIF_INSTR_OP(i)			(((i) >> 24) & 0xff)
+#define	DIF_INSTR_R1(i)			(((i) >> 16) & 0xff)
+#define	DIF_INSTR_R2(i)			(((i) >>  8) & 0xff)
+#define	DIF_INSTR_RD(i)			((i) & 0xff)
+#define	DIF_INSTR_RS(i)			((i) & 0xff)
+#define	DIF_INSTR_LABEL(i)		((i) & 0xffffff)
+#define	DIF_INSTR_VAR(i)		(((i) >>  8) & 0xffff)
+#define	DIF_INSTR_INTEGER(i)		(((i) >>  8) & 0xffff)
+#define	DIF_INSTR_STRING(i)		(((i) >>  8) & 0xffff)
+#define	DIF_INSTR_SUBR(i)		(((i) >>  8) & 0xffff)
+#define	DIF_INSTR_TYPE(i)		(((i) >> 16) & 0xff)
+#define	DIF_INSTR_XLREF(i)		(((i) >>  8) & 0xffff)
+
+#define	DIF_INSTR_FMT(op, r1, r2, d) \
+	(((op) << 24) | ((r1) << 16) | ((r2) << 8) | (d))
+
+#define	DIF_INSTR_NOT(r1, d)		(DIF_INSTR_FMT(DIF_OP_NOT, r1, 0, d))
+#define	DIF_INSTR_MOV(r1, d)		(DIF_INSTR_FMT(DIF_OP_MOV, r1, 0, d))
+#define	DIF_INSTR_CMP(op, r1, r2)	(DIF_INSTR_FMT(op, r1, r2, 0))
+#define	DIF_INSTR_TST(r1)		(DIF_INSTR_FMT(DIF_OP_TST, r1, 0, 0))
+#define	DIF_INSTR_BRANCH(op, label)	(((op) << 24) | (label))
+#define	DIF_INSTR_LOAD(op, r1, d)	(DIF_INSTR_FMT(op, r1, 0, d))
+#define	DIF_INSTR_STORE(op, r1, d)	(DIF_INSTR_FMT(op, r1, 0, d))
+#define	DIF_INSTR_SETX(i, d)		((DIF_OP_SETX << 24) | ((i) << 8) | (d))
+#define	DIF_INSTR_SETS(s, d)		((DIF_OP_SETS << 24) | ((s) << 8) | (d))
+#define	DIF_INSTR_RET(d)		(DIF_INSTR_FMT(DIF_OP_RET, 0, 0, d))
+#define	DIF_INSTR_NOP			(DIF_OP_NOP << 24)
+#define	DIF_INSTR_LDA(op, v, r, d)	(DIF_INSTR_FMT(op, v, r, d))
+#define	DIF_INSTR_LDV(op, v, d)		(((op) << 24) | ((v) << 8) | (d))
+#define	DIF_INSTR_STV(op, v, rs)	(((op) << 24) | ((v) << 8) | (rs))
+#define	DIF_INSTR_CALL(s, d)		((DIF_OP_CALL << 24) | ((s) << 8) | (d))
+#define	DIF_INSTR_PUSHTS(op, t, r2, rs)	(DIF_INSTR_FMT(op, t, r2, rs))
+#define	DIF_INSTR_POPTS			(DIF_OP_POPTS << 24)
+#define	DIF_INSTR_FLUSHTS		(DIF_OP_FLUSHTS << 24)
+#define	DIF_INSTR_ALLOCS(r1, d)		(DIF_INSTR_FMT(DIF_OP_ALLOCS, r1, 0, d))
+#define	DIF_INSTR_COPYS(r1, r2, d)	(DIF_INSTR_FMT(DIF_OP_COPYS, r1, r2, d))
+#define	DIF_INSTR_XLATE(op, r, d)	(((op) << 24) | ((r) << 8) | (d))
+
+#define	DIF_REG_R0	0		/* %r0 is always set to zero */
+
+/*
+ * A DTrace Intermediate Format Type (DIF Type) is used to represent the types
+ * of variables, function and associative array arguments, and the return type
+ * for each DIF object (shown below).  It contains a description of the type,
+ * its size in bytes, and a module identifier.
+ */
+typedef struct dtrace_diftype {
+	uint8_t dtdt_kind;		/* type kind (see below) */
+	uint8_t dtdt_ckind;		/* type kind in CTF */
+	uint8_t dtdt_flags;		/* type flags (see below) */
+	uint8_t dtdt_pad;		/* reserved for future use */
+	uint32_t dtdt_size;		/* type size in bytes (unless string) */
+} dtrace_diftype_t;
+
+#define	DIF_TYPE_CTF		0	/* type is a CTF type */
+#define	DIF_TYPE_STRING		1	/* type is a D string */
+
+#define	DIF_TF_BYREF		0x1	/* type is passed by reference */
+
+/*
+ * A DTrace Intermediate Format variable record is used to describe each of the
+ * variables referenced by a given DIF object.  It contains an integer variable
+ * identifier along with variable scope and properties, as shown below.  The
+ * size of this structure must be sizeof (int) aligned.
+ */
+typedef struct dtrace_difv {
+	uint32_t dtdv_name;		/* variable name index in dtdo_strtab */
+	uint32_t dtdv_id;		/* variable reference identifier */
+	uint8_t dtdv_kind;		/* variable kind (see below) */
+	uint8_t dtdv_scope;		/* variable scope (see below) */
+	uint16_t dtdv_flags;		/* variable flags (see below) */
+	dtrace_diftype_t dtdv_type;	/* variable type (see above) */
+} dtrace_difv_t;
+
+#define	DIFV_KIND_ARRAY		0	/* variable is an array of quantities */
+#define	DIFV_KIND_SCALAR	1	/* variable is a scalar quantity */
+
+#define	DIFV_SCOPE_GLOBAL	0	/* variable has global scope */
+#define	DIFV_SCOPE_THREAD	1	/* variable has thread scope */
+#define	DIFV_SCOPE_LOCAL	2	/* variable has local scope */
+
+#define	DIFV_F_REF		0x1	/* variable is referenced by DIFO */
+#define	DIFV_F_MOD		0x2	/* variable is written by DIFO */
+
+/*
+ * DTrace Actions
+ *
+ * The upper byte determines the class of the action; the low bytes determines
+ * the specific action within that class.  The classes of actions are as
+ * follows:
+ *
+ *   [ no class ]                  <= May record process- or kernel-related data
+ *   DTRACEACT_PROC                <= Only records process-related data
+ *   DTRACEACT_PROC_DESTRUCTIVE    <= Potentially destructive to processes
+ *   DTRACEACT_KERNEL              <= Only records kernel-related data
+ *   DTRACEACT_KERNEL_DESTRUCTIVE  <= Potentially destructive to the kernel
+ *   DTRACEACT_SPECULATIVE         <= Speculation-related action
+ *   DTRACEACT_AGGREGATION         <= Aggregating action
+ */
+#define	DTRACEACT_NONE			0	/* no action */
+#define	DTRACEACT_DIFEXPR		1	/* action is DIF expression */
+#define	DTRACEACT_EXIT			2	/* exit() action */
+#define	DTRACEACT_PRINTF		3	/* printf() action */
+#define	DTRACEACT_PRINTA		4	/* printa() action */
+#define	DTRACEACT_LIBACT		5	/* library-controlled action */
+
+#define	DTRACEACT_PROC			0x0100
+#define	DTRACEACT_USTACK		(DTRACEACT_PROC + 1)
+#define	DTRACEACT_JSTACK		(DTRACEACT_PROC + 2)
+#define	DTRACEACT_USYM			(DTRACEACT_PROC + 3)
+#define	DTRACEACT_UMOD			(DTRACEACT_PROC + 4)
+#define	DTRACEACT_UADDR			(DTRACEACT_PROC + 5)
+
+#define	DTRACEACT_PROC_DESTRUCTIVE	0x0200
+#define	DTRACEACT_STOP			(DTRACEACT_PROC_DESTRUCTIVE + 1)
+#define	DTRACEACT_RAISE			(DTRACEACT_PROC_DESTRUCTIVE + 2)
+#define	DTRACEACT_SYSTEM		(DTRACEACT_PROC_DESTRUCTIVE + 3)
+#define	DTRACEACT_FREOPEN		(DTRACEACT_PROC_DESTRUCTIVE + 4)
+
+#define	DTRACEACT_PROC_CONTROL		0x0300
+
+#define	DTRACEACT_KERNEL		0x0400
+#define	DTRACEACT_STACK			(DTRACEACT_KERNEL + 1)
+#define	DTRACEACT_SYM			(DTRACEACT_KERNEL + 2)
+#define	DTRACEACT_MOD			(DTRACEACT_KERNEL + 3)
+
+#define	DTRACEACT_KERNEL_DESTRUCTIVE	0x0500
+#define	DTRACEACT_BREAKPOINT		(DTRACEACT_KERNEL_DESTRUCTIVE + 1)
+#define	DTRACEACT_PANIC			(DTRACEACT_KERNEL_DESTRUCTIVE + 2)
+#define	DTRACEACT_CHILL			(DTRACEACT_KERNEL_DESTRUCTIVE + 3)
+
+#define	DTRACEACT_SPECULATIVE		0x0600
+#define	DTRACEACT_SPECULATE		(DTRACEACT_SPECULATIVE + 1)
+#define	DTRACEACT_COMMIT		(DTRACEACT_SPECULATIVE + 2)
+#define	DTRACEACT_DISCARD		(DTRACEACT_SPECULATIVE + 3)
+
+#define	DTRACEACT_CLASS(x)		((x) & 0xff00)
+
+#define	DTRACEACT_ISDESTRUCTIVE(x)	\
+	(DTRACEACT_CLASS(x) == DTRACEACT_PROC_DESTRUCTIVE || \
+	DTRACEACT_CLASS(x) == DTRACEACT_KERNEL_DESTRUCTIVE)
+
+#define	DTRACEACT_ISSPECULATIVE(x)	\
+	(DTRACEACT_CLASS(x) == DTRACEACT_SPECULATIVE)
+
+#define	DTRACEACT_ISPRINTFLIKE(x)	\
+	((x) == DTRACEACT_PRINTF || (x) == DTRACEACT_PRINTA || \
+	(x) == DTRACEACT_SYSTEM || (x) == DTRACEACT_FREOPEN)
+
+/*
+ * DTrace Aggregating Actions
+ *
+ * These are functions f(x) for which the following is true:
+ *
+ *    f(f(x_0) U f(x_1) U ... U f(x_n)) = f(x_0 U x_1 U ... U x_n)
+ *
+ * where x_n is a set of arbitrary data.  Aggregating actions are in their own
+ * DTrace action class, DTTRACEACT_AGGREGATION.  The macros provided here allow
+ * for easier processing of the aggregation argument and data payload for a few
+ * aggregating actions (notably:  quantize(), lquantize(), and ustack()).
+ */
+#define	DTRACEACT_AGGREGATION		0x0700
+#define	DTRACEAGG_COUNT			(DTRACEACT_AGGREGATION + 1)
+#define	DTRACEAGG_MIN			(DTRACEACT_AGGREGATION + 2)
+#define	DTRACEAGG_MAX			(DTRACEACT_AGGREGATION + 3)
+#define	DTRACEAGG_AVG			(DTRACEACT_AGGREGATION + 4)
+#define	DTRACEAGG_SUM			(DTRACEACT_AGGREGATION + 5)
+#define	DTRACEAGG_STDDEV		(DTRACEACT_AGGREGATION + 6)
+#define	DTRACEAGG_QUANTIZE		(DTRACEACT_AGGREGATION + 7)
+#define	DTRACEAGG_LQUANTIZE		(DTRACEACT_AGGREGATION + 8)
+
+#define	DTRACEACT_ISAGG(x)		\
+	(DTRACEACT_CLASS(x) == DTRACEACT_AGGREGATION)
+
+#define	DTRACE_QUANTIZE_NBUCKETS	\
+	(((sizeof (uint64_t) * NBBY) - 1) * 2 + 1)
+
+#define	DTRACE_QUANTIZE_ZEROBUCKET	((sizeof (uint64_t) * NBBY) - 1)
+
+#define	DTRACE_QUANTIZE_BUCKETVAL(buck)					\
+	(int64_t)((buck) < DTRACE_QUANTIZE_ZEROBUCKET ?			\
+	-(1LL << (DTRACE_QUANTIZE_ZEROBUCKET - 1 - (buck))) :		\
+	(buck) == DTRACE_QUANTIZE_ZEROBUCKET ? 0 :			\
+	1LL << ((buck) - DTRACE_QUANTIZE_ZEROBUCKET - 1))
+
+#define	DTRACE_LQUANTIZE_STEPSHIFT		48
+#define	DTRACE_LQUANTIZE_STEPMASK		((uint64_t)UINT16_MAX << 48)
+#define	DTRACE_LQUANTIZE_LEVELSHIFT		32
+#define	DTRACE_LQUANTIZE_LEVELMASK		((uint64_t)UINT16_MAX << 32)
+#define	DTRACE_LQUANTIZE_BASESHIFT		0
+#define	DTRACE_LQUANTIZE_BASEMASK		UINT32_MAX
+
+#define	DTRACE_LQUANTIZE_STEP(x)		\
+	(uint16_t)(((x) & DTRACE_LQUANTIZE_STEPMASK) >> \
+	DTRACE_LQUANTIZE_STEPSHIFT)
+
+#define	DTRACE_LQUANTIZE_LEVELS(x)		\
+	(uint16_t)(((x) & DTRACE_LQUANTIZE_LEVELMASK) >> \
+	DTRACE_LQUANTIZE_LEVELSHIFT)
+
+#define	DTRACE_LQUANTIZE_BASE(x)		\
+	(int32_t)(((x) & DTRACE_LQUANTIZE_BASEMASK) >> \
+	DTRACE_LQUANTIZE_BASESHIFT)
+
+#define	DTRACE_USTACK_NFRAMES(x)	(uint32_t)((x) & UINT32_MAX)
+#define	DTRACE_USTACK_STRSIZE(x)	(uint32_t)((x) >> 32)
+#define	DTRACE_USTACK_ARG(x, y)		\
+	((((uint64_t)(y)) << 32) | ((x) & UINT32_MAX))
+
+#ifndef _LP64
+#ifndef _LITTLE_ENDIAN
+#define	DTRACE_PTR(type, name)	uint32_t name##pad; type *name
+#else
+#define	DTRACE_PTR(type, name)	type *name; uint32_t name##pad
+#endif
+#else
+#define	DTRACE_PTR(type, name)	type *name
+#endif
+
+/*
+ * DTrace Object Format (DOF)
+ *
+ * DTrace programs can be persistently encoded in the DOF format so that they
+ * may be embedded in other programs (for example, in an ELF file) or in the
+ * dtrace driver configuration file for use in anonymous tracing.  The DOF
+ * format is versioned and extensible so that it can be revised and so that
+ * internal data structures can be modified or extended compatibly.  All DOF
+ * structures use fixed-size types, so the 32-bit and 64-bit representations
+ * are identical and consumers can use either data model transparently.
+ *
+ * The file layout is structured as follows:
+ *
+ * +---------------+-------------------+----- ... ----+---- ... ------+
+ * |   dof_hdr_t   |  dof_sec_t[ ... ] |   loadable   | non-loadable  |
+ * | (file header) | (section headers) | section data | section data  |
+ * +---------------+-------------------+----- ... ----+---- ... ------+
+ * |<------------ dof_hdr.dofh_loadsz --------------->|               |
+ * |<------------ dof_hdr.dofh_filesz ------------------------------->|
+ *
+ * The file header stores meta-data including a magic number, data model for
+ * the instrumentation, data encoding, and properties of the DIF code within.
+ * The header describes its own size and the size of the section headers.  By
+ * convention, an array of section headers follows the file header, and then
+ * the data for all loadable sections and unloadable sections.  This permits
+ * consumer code to easily download the headers and all loadable data into the
+ * DTrace driver in one contiguous chunk, omitting other extraneous sections.
+ *
+ * The section headers describe the size, offset, alignment, and section type
+ * for each section.  Sections are described using a set of #defines that tell
+ * the consumer what kind of data is expected.  Sections can contain links to
+ * other sections by storing a dof_secidx_t, an index into the section header
+ * array, inside of the section data structures.  The section header includes
+ * an entry size so that sections with data arrays can grow their structures.
+ *
+ * The DOF data itself can contain many snippets of DIF (i.e. >1 DIFOs), which
+ * are represented themselves as a collection of related DOF sections.  This
+ * permits us to change the set of sections associated with a DIFO over time,
+ * and also permits us to encode DIFOs that contain different sets of sections.
+ * When a DOF section wants to refer to a DIFO, it stores the dof_secidx_t of a
+ * section of type DOF_SECT_DIFOHDR.  This section's data is then an array of
+ * dof_secidx_t's which in turn denote the sections associated with this DIFO.
+ *
+ * This loose coupling of the file structure (header and sections) to the
+ * structure of the DTrace program itself (ECB descriptions, action
+ * descriptions, and DIFOs) permits activities such as relocation processing
+ * to occur in a single pass without having to understand D program structure.
+ *
+ * Finally, strings are always stored in ELF-style string tables along with a
+ * string table section index and string table offset.  Therefore strings in
+ * DOF are always arbitrary-length and not bound to the current implementation.
+ */
+
+#define	DOF_ID_SIZE	16	/* total size of dofh_ident[] in bytes */
+
+typedef struct dof_hdr {
+	uint8_t dofh_ident[DOF_ID_SIZE]; /* identification bytes (see below) */
+	uint32_t dofh_flags;		/* file attribute flags (if any) */
+	uint32_t dofh_hdrsize;		/* size of file header in bytes */
+	uint32_t dofh_secsize;		/* size of section header in bytes */
+	uint32_t dofh_secnum;		/* number of section headers */
+	uint64_t dofh_secoff;		/* file offset of section headers */
+	uint64_t dofh_loadsz;		/* file size of loadable portion */
+	uint64_t dofh_filesz;		/* file size of entire DOF file */
+	uint64_t dofh_pad;		/* reserved for future use */
+} dof_hdr_t;
+
+#define	DOF_ID_MAG0	0	/* first byte of magic number */
+#define	DOF_ID_MAG1	1	/* second byte of magic number */
+#define	DOF_ID_MAG2	2	/* third byte of magic number */
+#define	DOF_ID_MAG3	3	/* fourth byte of magic number */
+#define	DOF_ID_MODEL	4	/* DOF data model (see below) */
+#define	DOF_ID_ENCODING	5	/* DOF data encoding (see below) */
+#define	DOF_ID_VERSION	6	/* DOF file format major version (see below) */
+#define	DOF_ID_DIFVERS	7	/* DIF instruction set version */
+#define	DOF_ID_DIFIREG	8	/* DIF integer registers used by compiler */
+#define	DOF_ID_DIFTREG	9	/* DIF tuple registers used by compiler */
+#define	DOF_ID_PAD	10	/* start of padding bytes (all zeroes) */
+
+#define	DOF_MAG_MAG0	0x7F	/* DOF_ID_MAG[0-3] */
+#define	DOF_MAG_MAG1	'D'
+#define	DOF_MAG_MAG2	'O'
+#define	DOF_MAG_MAG3	'F'
+
+#define	DOF_MAG_STRING	"\177DOF"
+#define	DOF_MAG_STRLEN	4
+
+#define	DOF_MODEL_NONE	0	/* DOF_ID_MODEL */
+#define	DOF_MODEL_ILP32	1
+#define	DOF_MODEL_LP64	2
+
+#ifdef _LP64
+#define	DOF_MODEL_NATIVE	DOF_MODEL_LP64
+#else
+#define	DOF_MODEL_NATIVE	DOF_MODEL_ILP32
+#endif
+
+#define	DOF_ENCODE_NONE	0	/* DOF_ID_ENCODING */
+#define	DOF_ENCODE_LSB	1
+#define	DOF_ENCODE_MSB	2
+
+#ifdef _BIG_ENDIAN
+#define	DOF_ENCODE_NATIVE	DOF_ENCODE_MSB
+#else
+#define	DOF_ENCODE_NATIVE	DOF_ENCODE_LSB
+#endif
+
+#define	DOF_VERSION_1	1	/* DOF version 1: Solaris 10 FCS */
+#define	DOF_VERSION_2	2	/* DOF version 2: Solaris Express 6/06 */
+#define	DOF_VERSION	DOF_VERSION_2	/* Latest DOF version */
+
+#define	DOF_FL_VALID	0	/* mask of all valid dofh_flags bits */
+
+typedef uint32_t dof_secidx_t;	/* section header table index type */
+typedef uint32_t dof_stridx_t;	/* string table index type */
+
+#define	DOF_SECIDX_NONE	(-1U)	/* null value for section indices */
+#define	DOF_STRIDX_NONE	(-1U)	/* null value for string indices */
+
+typedef struct dof_sec {
+	uint32_t dofs_type;	/* section type (see below) */
+	uint32_t dofs_align;	/* section data memory alignment */
+	uint32_t dofs_flags;	/* section flags (if any) */
+	uint32_t dofs_entsize;	/* size of section entry (if table) */
+	uint64_t dofs_offset;	/* offset of section data within file */
+	uint64_t dofs_size;	/* size of section data in bytes */
+} dof_sec_t;
+
+#define	DOF_SECT_NONE		0	/* null section */
+#define	DOF_SECT_COMMENTS	1	/* compiler comments */
+#define	DOF_SECT_SOURCE		2	/* D program source code */
+#define	DOF_SECT_ECBDESC	3	/* dof_ecbdesc_t */
+#define	DOF_SECT_PROBEDESC	4	/* dof_probedesc_t */
+#define	DOF_SECT_ACTDESC	5	/* dof_actdesc_t array */
+#define	DOF_SECT_DIFOHDR	6	/* dof_difohdr_t (variable length) */
+#define	DOF_SECT_DIF		7	/* uint32_t array of byte code */
+#define	DOF_SECT_STRTAB		8	/* string table */
+#define	DOF_SECT_VARTAB		9	/* dtrace_difv_t array */
+#define	DOF_SECT_RELTAB		10	/* dof_relodesc_t array */
+#define	DOF_SECT_TYPTAB		11	/* dtrace_diftype_t array */
+#define	DOF_SECT_URELHDR	12	/* dof_relohdr_t (user relocations) */
+#define	DOF_SECT_KRELHDR	13	/* dof_relohdr_t (kernel relocations) */
+#define	DOF_SECT_OPTDESC	14	/* dof_optdesc_t array */
+#define	DOF_SECT_PROVIDER	15	/* dof_provider_t */
+#define	DOF_SECT_PROBES		16	/* dof_probe_t array */
+#define	DOF_SECT_PRARGS		17	/* uint8_t array (probe arg mappings) */
+#define	DOF_SECT_PROFFS		18	/* uint32_t array (probe arg offsets) */
+#define	DOF_SECT_INTTAB		19	/* uint64_t array */
+#define	DOF_SECT_UTSNAME	20	/* struct utsname */
+#define	DOF_SECT_XLTAB		21	/* dof_xlref_t array */
+#define	DOF_SECT_XLMEMBERS	22	/* dof_xlmember_t array */
+#define	DOF_SECT_XLIMPORT	23	/* dof_xlator_t */
+#define	DOF_SECT_XLEXPORT	24	/* dof_xlator_t */
+#define	DOF_SECT_PREXPORT	25	/* dof_secidx_t array (exported objs) */
+#define	DOF_SECT_PRENOFFS	26	/* uint32_t array (enabled offsets) */
+
+#define	DOF_SECF_LOAD		1	/* section should be loaded */
+
+typedef struct dof_ecbdesc {
+	dof_secidx_t dofe_probes;	/* link to DOF_SECT_PROBEDESC */
+	dof_secidx_t dofe_pred;		/* link to DOF_SECT_DIFOHDR */
+	dof_secidx_t dofe_actions;	/* link to DOF_SECT_ACTDESC */
+	uint32_t dofe_pad;		/* reserved for future use */
+	uint64_t dofe_uarg;		/* user-supplied library argument */
+} dof_ecbdesc_t;
+
+typedef struct dof_probedesc {
+	dof_secidx_t dofp_strtab;	/* link to DOF_SECT_STRTAB section */
+	dof_stridx_t dofp_provider;	/* provider string */
+	dof_stridx_t dofp_mod;		/* module string */
+	dof_stridx_t dofp_func;		/* function string */
+	dof_stridx_t dofp_name;		/* name string */
+	uint32_t dofp_id;		/* probe identifier (or zero) */
+} dof_probedesc_t;
+
+typedef struct dof_actdesc {
+	dof_secidx_t dofa_difo;		/* link to DOF_SECT_DIFOHDR */
+	dof_secidx_t dofa_strtab;	/* link to DOF_SECT_STRTAB section */
+	uint32_t dofa_kind;		/* action kind (DTRACEACT_* constant) */
+	uint32_t dofa_ntuple;		/* number of subsequent tuple actions */
+	uint64_t dofa_arg;		/* kind-specific argument */
+	uint64_t dofa_uarg;		/* user-supplied argument */
+} dof_actdesc_t;
+
+typedef struct dof_difohdr {
+	dtrace_diftype_t dofd_rtype;	/* return type for this fragment */
+	dof_secidx_t dofd_links[1];	/* variable length array of indices */
+} dof_difohdr_t;
+
+typedef struct dof_relohdr {
+	dof_secidx_t dofr_strtab;	/* link to DOF_SECT_STRTAB for names */
+	dof_secidx_t dofr_relsec;	/* link to DOF_SECT_RELTAB for relos */
+	dof_secidx_t dofr_tgtsec;	/* link to section we are relocating */
+} dof_relohdr_t;
+
+typedef struct dof_relodesc {
+	dof_stridx_t dofr_name;		/* string name of relocation symbol */
+	uint32_t dofr_type;		/* relo type (DOF_RELO_* constant) */
+	uint64_t dofr_offset;		/* byte offset for relocation */
+	uint64_t dofr_data;		/* additional type-specific data */
+} dof_relodesc_t;
+
+#define	DOF_RELO_NONE	0		/* empty relocation entry */
+#define	DOF_RELO_SETX	1		/* relocate setx value */
+
+typedef struct dof_optdesc {
+	uint32_t dofo_option;		/* option identifier */
+	dof_secidx_t dofo_strtab;	/* string table, if string option */
+	uint64_t dofo_value;		/* option value or string index */
+} dof_optdesc_t;
+
+typedef uint32_t dof_attr_t;		/* encoded stability attributes */
+
+#define	DOF_ATTR(n, d, c)	(((n) << 24) | ((d) << 16) | ((c) << 8))
+#define	DOF_ATTR_NAME(a)	(((a) >> 24) & 0xff)
+#define	DOF_ATTR_DATA(a)	(((a) >> 16) & 0xff)
+#define	DOF_ATTR_CLASS(a)	(((a) >>  8) & 0xff)
+
+typedef struct dof_provider {
+	dof_secidx_t dofpv_strtab;	/* link to DOF_SECT_STRTAB section */
+	dof_secidx_t dofpv_probes;	/* link to DOF_SECT_PROBES section */
+	dof_secidx_t dofpv_prargs;	/* link to DOF_SECT_PRARGS section */
+	dof_secidx_t dofpv_proffs;	/* link to DOF_SECT_PROFFS section */
+	dof_stridx_t dofpv_name;	/* provider name string */
+	dof_attr_t dofpv_provattr;	/* provider attributes */
+	dof_attr_t dofpv_modattr;	/* module attributes */
+	dof_attr_t dofpv_funcattr;	/* function attributes */
+	dof_attr_t dofpv_nameattr;	/* name attributes */
+	dof_attr_t dofpv_argsattr;	/* args attributes */
+	dof_secidx_t dofpv_prenoffs;	/* link to DOF_SECT_PRENOFFS section */
+} dof_provider_t;
+
+typedef struct dof_probe {
+	uint64_t dofpr_addr;		/* probe base address or offset */
+	dof_stridx_t dofpr_func;	/* probe function string */
+	dof_stridx_t dofpr_name;	/* probe name string */
+	dof_stridx_t dofpr_nargv;	/* native argument type strings */
+	dof_stridx_t dofpr_xargv;	/* translated argument type strings */
+	uint32_t dofpr_argidx;		/* index of first argument mapping */
+	uint32_t dofpr_offidx;		/* index of first offset entry */
+	uint8_t dofpr_nargc;		/* native argument count */
+	uint8_t dofpr_xargc;		/* translated argument count */
+	uint16_t dofpr_noffs;		/* number of offset entries for probe */
+	uint32_t dofpr_enoffidx;	/* index of first is-enabled offset */
+	uint16_t dofpr_nenoffs;		/* number of is-enabled offsets */
+	uint16_t dofpr_pad1;		/* reserved for future use */
+	uint32_t dofpr_pad2;		/* reserved for future use */
+} dof_probe_t;
+
+typedef struct dof_xlator {
+	dof_secidx_t dofxl_members;	/* link to DOF_SECT_XLMEMBERS section */
+	dof_secidx_t dofxl_strtab;	/* link to DOF_SECT_STRTAB section */
+	dof_stridx_t dofxl_argv;	/* input parameter type strings */
+	uint32_t dofxl_argc;		/* input parameter list length */
+	dof_stridx_t dofxl_type;	/* output type string name */
+	dof_attr_t dofxl_attr;		/* output stability attributes */
+} dof_xlator_t;
+
+typedef struct dof_xlmember {
+	dof_secidx_t dofxm_difo;	/* member link to DOF_SECT_DIFOHDR */
+	dof_stridx_t dofxm_name;	/* member name */
+	dtrace_diftype_t dofxm_type;	/* member type */
+} dof_xlmember_t;
+
+typedef struct dof_xlref {
+	dof_secidx_t dofxr_xlator;	/* link to DOF_SECT_XLATORS section */
+	uint32_t dofxr_member;		/* index of referenced dof_xlmember */
+	uint32_t dofxr_argn;		/* index of argument for DIF_OP_XLARG */
+} dof_xlref_t;
+
+/*
+ * DTrace Intermediate Format Object (DIFO)
+ *
+ * A DIFO is used to store the compiled DIF for a D expression, its return
+ * type, and its string and variable tables.  The string table is a single
+ * buffer of character data into which sets instructions and variable
+ * references can reference strings using a byte offset.  The variable table
+ * is an array of dtrace_difv_t structures that describe the name and type of
+ * each variable and the id used in the DIF code.  This structure is described
+ * above in the DIF section of this header file.  The DIFO is used at both
+ * user-level (in the library) and in the kernel, but the structure is never
+ * passed between the two: the DOF structures form the only interface.  As a
+ * result, the definition can change depending on the presence of _KERNEL.
+ */
+typedef struct dtrace_difo {
+	dif_instr_t *dtdo_buf;		/* instruction buffer */
+	uint64_t *dtdo_inttab;		/* integer table (optional) */
+	char *dtdo_strtab;		/* string table (optional) */
+	dtrace_difv_t *dtdo_vartab;	/* variable table (optional) */
+	uint_t dtdo_len;		/* length of instruction buffer */
+	uint_t dtdo_intlen;		/* length of integer table */
+	uint_t dtdo_strlen;		/* length of string table */
+	uint_t dtdo_varlen;		/* length of variable table */
+	dtrace_diftype_t dtdo_rtype;	/* return type */
+	uint_t dtdo_refcnt;		/* owner reference count */
+	uint_t dtdo_destructive;	/* invokes destructive subroutines */
+#ifndef _KERNEL
+	dof_relodesc_t *dtdo_kreltab;	/* kernel relocations */
+	dof_relodesc_t *dtdo_ureltab;	/* user relocations */
+	struct dt_node **dtdo_xlmtab;	/* translator references */
+	uint_t dtdo_krelen;		/* length of krelo table */
+	uint_t dtdo_urelen;		/* length of urelo table */
+	uint_t dtdo_xlmlen;		/* length of translator table */
+#endif
+} dtrace_difo_t;
+
+/*
+ * DTrace Enabling Description Structures
+ *
+ * When DTrace is tracking the description of a DTrace enabling entity (probe,
+ * predicate, action, ECB, record, etc.), it does so in a description
+ * structure.  These structures all end in "desc", and are used at both
+ * user-level and in the kernel -- but (with the exception of
+ * dtrace_probedesc_t) they are never passed between them.  Typically,
+ * user-level will use the description structures when assembling an enabling.
+ * It will then distill those description structures into a DOF object (see
+ * above), and send it into the kernel.  The kernel will again use the
+ * description structures to create a description of the enabling as it reads
+ * the DOF.  When the description is complete, the enabling will be actually
+ * created -- turning it into the structures that represent the enabling
+ * instead of merely describing it.  Not surprisingly, the description
+ * structures bear a strong resemblance to the DOF structures that act as their
+ * conduit.
+ */
+struct dtrace_predicate;
+
+typedef struct dtrace_probedesc {
+	dtrace_id_t dtpd_id;			/* probe identifier */
+	char dtpd_provider[DTRACE_PROVNAMELEN]; /* probe provider name */
+	char dtpd_mod[DTRACE_MODNAMELEN];	/* probe module name */
+	char dtpd_func[DTRACE_FUNCNAMELEN];	/* probe function name */
+	char dtpd_name[DTRACE_NAMELEN];		/* probe name */
+} dtrace_probedesc_t;
+
+typedef struct dtrace_repldesc {
+	dtrace_probedesc_t dtrpd_match;		/* probe descr. to match */
+	dtrace_probedesc_t dtrpd_create;	/* probe descr. to create */
+} dtrace_repldesc_t;
+
+typedef struct dtrace_preddesc {
+	dtrace_difo_t *dtpdd_difo;		/* pointer to DIF object */
+	struct dtrace_predicate *dtpdd_predicate; /* pointer to predicate */
+} dtrace_preddesc_t;
+
+typedef struct dtrace_actdesc {
+	dtrace_difo_t *dtad_difo;		/* pointer to DIF object */
+	struct dtrace_actdesc *dtad_next;	/* next action */
+	dtrace_actkind_t dtad_kind;		/* kind of action */
+	uint32_t dtad_ntuple;			/* number in tuple */
+	uint64_t dtad_arg;			/* action argument */
+	uint64_t dtad_uarg;			/* user argument */
+	int dtad_refcnt;			/* reference count */
+} dtrace_actdesc_t;
+
+typedef struct dtrace_ecbdesc {
+	dtrace_actdesc_t *dted_action;		/* action description(s) */
+	dtrace_preddesc_t dted_pred;		/* predicate description */
+	dtrace_probedesc_t dted_probe;		/* probe description */
+	uint64_t dted_uarg;			/* library argument */
+	int dted_refcnt;			/* reference count */
+} dtrace_ecbdesc_t;
+
+/*
+ * DTrace Metadata Description Structures
+ *
+ * DTrace separates the trace data stream from the metadata stream.  The only
+ * metadata tokens placed in the data stream are enabled probe identifiers
+ * (EPIDs) or (in the case of aggregations) aggregation identifiers.  In order
+ * to determine the structure of the data, DTrace consumers pass the token to
+ * the kernel, and receive in return a corresponding description of the enabled
+ * probe (via the dtrace_eprobedesc structure) or the aggregation (via the
+ * dtrace_aggdesc structure).  Both of these structures are expressed in terms
+ * of record descriptions (via the dtrace_recdesc structure) that describe the
+ * exact structure of the data.  Some record descriptions may also contain a
+ * format identifier; this additional bit of metadata can be retrieved from the
+ * kernel, for which a format description is returned via the dtrace_fmtdesc
+ * structure.  Note that all four of these structures must be bitness-neutral
+ * to allow for a 32-bit DTrace consumer on a 64-bit kernel.
+ */
+typedef struct dtrace_recdesc {
+	dtrace_actkind_t dtrd_action;		/* kind of action */
+	uint32_t dtrd_size;			/* size of record */
+	uint32_t dtrd_offset;			/* offset in ECB's data */
+	uint16_t dtrd_alignment;		/* required alignment */
+	uint16_t dtrd_format;			/* format, if any */
+	uint64_t dtrd_arg;			/* action argument */
+	uint64_t dtrd_uarg;			/* user argument */
+} dtrace_recdesc_t;
+
+typedef struct dtrace_eprobedesc {
+	dtrace_epid_t dtepd_epid;		/* enabled probe ID */
+	dtrace_id_t dtepd_probeid;		/* probe ID */
+	uint64_t dtepd_uarg;			/* library argument */
+	uint32_t dtepd_size;			/* total size */
+	int dtepd_nrecs;			/* number of records */
+	dtrace_recdesc_t dtepd_rec[1];		/* records themselves */
+} dtrace_eprobedesc_t;
+
+typedef struct dtrace_aggdesc {
+	DTRACE_PTR(char, dtagd_name);		/* not filled in by kernel */
+	dtrace_aggvarid_t dtagd_varid;		/* not filled in by kernel */
+	int dtagd_flags;			/* not filled in by kernel */
+	dtrace_aggid_t dtagd_id;		/* aggregation ID */
+	dtrace_epid_t dtagd_epid;		/* enabled probe ID */
+	uint32_t dtagd_size;			/* size in bytes */
+	int dtagd_nrecs;			/* number of records */
+	uint32_t dtagd_pad;			/* explicit padding */
+	dtrace_recdesc_t dtagd_rec[1];		/* record descriptions */
+} dtrace_aggdesc_t;
+
+typedef struct dtrace_fmtdesc {
+	DTRACE_PTR(char, dtfd_string);		/* format string */
+	int dtfd_length;			/* length of format string */
+	uint16_t dtfd_format;			/* format identifier */
+} dtrace_fmtdesc_t;
+
+#define	DTRACE_SIZEOF_EPROBEDESC(desc)				\
+	(sizeof (dtrace_eprobedesc_t) + ((desc)->dtepd_nrecs ?	\
+	(((desc)->dtepd_nrecs - 1) * sizeof (dtrace_recdesc_t)) : 0))
+
+#define	DTRACE_SIZEOF_AGGDESC(desc)				\
+	(sizeof (dtrace_aggdesc_t) + ((desc)->dtagd_nrecs ?	\
+	(((desc)->dtagd_nrecs - 1) * sizeof (dtrace_recdesc_t)) : 0))
+
+/*
+ * DTrace Option Interface
+ *
+ * Run-time DTrace options are set and retrieved via DOF_SECT_OPTDESC sections
+ * in a DOF image.  The dof_optdesc structure contains an option identifier and
+ * an option value.  The valid option identifiers are found below; the mapping
+ * between option identifiers and option identifying strings is maintained at
+ * user-level.  Note that the value of DTRACEOPT_UNSET is such that all of the
+ * following are potentially valid option values:  all positive integers, zero
+ * and negative one.  Some options (notably "bufpolicy" and "bufresize") take
+ * predefined tokens as their values; these are defined with
+ * DTRACEOPT_{option}_{token}.
+ */
+#define	DTRACEOPT_BUFSIZE	0	/* buffer size */
+#define	DTRACEOPT_BUFPOLICY	1	/* buffer policy */
+#define	DTRACEOPT_DYNVARSIZE	2	/* dynamic variable size */
+#define	DTRACEOPT_AGGSIZE	3	/* aggregation size */
+#define	DTRACEOPT_SPECSIZE	4	/* speculation size */
+#define	DTRACEOPT_NSPEC		5	/* number of speculations */
+#define	DTRACEOPT_STRSIZE	6	/* string size */
+#define	DTRACEOPT_CLEANRATE	7	/* dynvar cleaning rate */
+#define	DTRACEOPT_CPU		8	/* CPU to trace */
+#define	DTRACEOPT_BUFRESIZE	9	/* buffer resizing policy */
+#define	DTRACEOPT_GRABANON	10	/* grab anonymous state, if any */
+#define	DTRACEOPT_FLOWINDENT	11	/* indent function entry/return */
+#define	DTRACEOPT_QUIET		12	/* only output explicitly traced data */
+#define	DTRACEOPT_STACKFRAMES	13	/* number of stack frames */
+#define	DTRACEOPT_USTACKFRAMES	14	/* number of user stack frames */
+#define	DTRACEOPT_AGGRATE	15	/* aggregation snapshot rate */
+#define	DTRACEOPT_SWITCHRATE	16	/* buffer switching rate */
+#define	DTRACEOPT_STATUSRATE	17	/* status rate */
+#define	DTRACEOPT_DESTRUCTIVE	18	/* destructive actions allowed */
+#define	DTRACEOPT_STACKINDENT	19	/* output indent for stack traces */
+#define	DTRACEOPT_RAWBYTES	20	/* always print bytes in raw form */
+#define	DTRACEOPT_JSTACKFRAMES	21	/* number of jstack() frames */
+#define	DTRACEOPT_JSTACKSTRSIZE	22	/* size of jstack() string table */
+#define	DTRACEOPT_AGGSORTKEY	23	/* sort aggregations by key */
+#define	DTRACEOPT_AGGSORTREV	24	/* reverse-sort aggregations */
+#define	DTRACEOPT_AGGSORTPOS	25	/* agg. position to sort on */
+#define	DTRACEOPT_AGGSORTKEYPOS	26	/* agg. key position to sort on */
+#define	DTRACEOPT_MAX		27	/* number of options */
+
+#define	DTRACEOPT_UNSET		(dtrace_optval_t)-2	/* unset option */
+
+#define	DTRACEOPT_BUFPOLICY_RING	0	/* ring buffer */
+#define	DTRACEOPT_BUFPOLICY_FILL	1	/* fill buffer, then stop */
+#define	DTRACEOPT_BUFPOLICY_SWITCH	2	/* switch buffers */
+
+#define	DTRACEOPT_BUFRESIZE_AUTO	0	/* automatic resizing */
+#define	DTRACEOPT_BUFRESIZE_MANUAL	1	/* manual resizing */
+
+/*
+ * DTrace Buffer Interface
+ *
+ * In order to get a snapshot of the principal or aggregation buffer,
+ * user-level passes a buffer description to the kernel with the dtrace_bufdesc
+ * structure.  This describes which CPU user-level is interested in, and
+ * where user-level wishes the kernel to snapshot the buffer to (the
+ * dtbd_data field).  The kernel uses the same structure to pass back some
+ * information regarding the buffer:  the size of data actually copied out, the
+ * number of drops, the number of errors, and the offset of the oldest record.
+ * If the buffer policy is a "switch" policy, taking a snapshot of the
+ * principal buffer has the additional effect of switching the active and
+ * inactive buffers.  Taking a snapshot of the aggregation buffer _always_ has
+ * the additional effect of switching the active and inactive buffers.
+ */
+typedef struct dtrace_bufdesc {
+	uint64_t dtbd_size;			/* size of buffer */
+	uint32_t dtbd_cpu;			/* CPU or DTRACE_CPUALL */
+	uint32_t dtbd_errors;			/* number of errors */
+	uint64_t dtbd_drops;			/* number of drops */
+	DTRACE_PTR(char, dtbd_data);		/* data */
+	uint64_t dtbd_oldest;			/* offset of oldest record */
+} dtrace_bufdesc_t;
+
+/*
+ * DTrace Status
+ *
+ * The status of DTrace is relayed via the dtrace_status structure.  This
+ * structure contains members to count drops other than the capacity drops
+ * available via the buffer interface (see above).  This consists of dynamic
+ * drops (including capacity dynamic drops, rinsing drops and dirty drops), and
+ * speculative drops (including capacity speculative drops, drops due to busy
+ * speculative buffers and drops due to unavailable speculative buffers).
+ * Additionally, the status structure contains a field to indicate the number
+ * of "fill"-policy buffers have been filled and a boolean field to indicate
+ * that exit() has been called.  If the dtst_exiting field is non-zero, no
+ * further data will be generated until tracing is stopped (at which time any
+ * enablings of the END action will be processed); if user-level sees that
+ * this field is non-zero, tracing should be stopped as soon as possible.
+ */
+typedef struct dtrace_status {
+	uint64_t dtst_dyndrops;			/* dynamic drops */
+	uint64_t dtst_dyndrops_rinsing;		/* dyn drops due to rinsing */
+	uint64_t dtst_dyndrops_dirty;		/* dyn drops due to dirty */
+	uint64_t dtst_specdrops;		/* speculative drops */
+	uint64_t dtst_specdrops_busy;		/* spec drops due to busy */
+	uint64_t dtst_specdrops_unavail;	/* spec drops due to unavail */
+	uint64_t dtst_errors;			/* total errors */
+	uint64_t dtst_filled;			/* number of filled bufs */
+	uint64_t dtst_stkstroverflows;		/* stack string tab overflows */
+	uint64_t dtst_dblerrors;		/* errors in ERROR probes */
+	char dtst_killed;			/* non-zero if killed */
+	char dtst_exiting;			/* non-zero if exit() called */
+	char dtst_pad[6];			/* pad out to 64-bit align */
+} dtrace_status_t;
+
+/*
+ * DTrace Configuration
+ *
+ * User-level may need to understand some elements of the kernel DTrace
+ * configuration in order to generate correct DIF.  This information is
+ * conveyed via the dtrace_conf structure.
+ */
+typedef struct dtrace_conf {
+	uint_t dtc_difversion;			/* supported DIF version */
+	uint_t dtc_difintregs;			/* # of DIF integer registers */
+	uint_t dtc_diftupregs;			/* # of DIF tuple registers */
+	uint_t dtc_ctfmodel;			/* CTF data model */
+	uint_t dtc_pad[8];			/* reserved for future use */
+} dtrace_conf_t;
+
+/*
+ * DTrace Faults
+ *
+ * The constants below DTRACEFLT_LIBRARY indicate probe processing faults;
+ * constants at or above DTRACEFLT_LIBRARY indicate faults in probe
+ * postprocessing at user-level.  Probe processing faults induce an ERROR
+ * probe and are replicated in unistd.d to allow users' ERROR probes to decode
+ * the error condition using thse symbolic labels.
+ */
+#define	DTRACEFLT_UNKNOWN		0	/* Unknown fault */
+#define	DTRACEFLT_BADADDR		1	/* Bad address */
+#define	DTRACEFLT_BADALIGN		2	/* Bad alignment */
+#define	DTRACEFLT_ILLOP			3	/* Illegal operation */
+#define	DTRACEFLT_DIVZERO		4	/* Divide-by-zero */
+#define	DTRACEFLT_NOSCRATCH		5	/* Out of scratch space */
+#define	DTRACEFLT_KPRIV			6	/* Illegal kernel access */
+#define	DTRACEFLT_UPRIV			7	/* Illegal user access */
+#define	DTRACEFLT_TUPOFLOW		8	/* Tuple stack overflow */
+#define	DTRACEFLT_BADSTACK		9	/* Bad stack */
+
+#define	DTRACEFLT_LIBRARY		1000	/* Library-level fault */
+
+/*
+ * DTrace Argument Types
+ *
+ * Because it would waste both space and time, argument types do not reside
+ * with the probe.  In order to determine argument types for args[X]
+ * variables, the D compiler queries for argument types on a probe-by-probe
+ * basis.  (This optimizes for the common case that arguments are either not
+ * used or used in an untyped fashion.)  Typed arguments are specified with a
+ * string of the type name in the dtragd_native member of the argument
+ * description structure.  Typed arguments may be further translated to types
+ * of greater stability; the provider indicates such a translated argument by
+ * filling in the dtargd_xlate member with the string of the translated type.
+ * Finally, the provider may indicate which argument value a given argument
+ * maps to by setting the dtargd_mapping member -- allowing a single argument
+ * to map to multiple args[X] variables.
+ */
+typedef struct dtrace_argdesc {
+	dtrace_id_t dtargd_id;			/* probe identifier */
+	int dtargd_ndx;				/* arg number (-1 iff none) */
+	int dtargd_mapping;			/* value mapping */
+	char dtargd_native[DTRACE_ARGTYPELEN];	/* native type name */
+	char dtargd_xlate[DTRACE_ARGTYPELEN];	/* translated type name */
+} dtrace_argdesc_t;
+
+/*
+ * DTrace Stability Attributes
+ *
+ * Each DTrace provider advertises the name and data stability of each of its
+ * probe description components, as well as its architectural dependencies.
+ * The D compiler can query the provider attributes (dtrace_pattr_t below) in
+ * order to compute the properties of an input program and report them.
+ */
+typedef uint8_t dtrace_stability_t;	/* stability code (see attributes(5)) */
+typedef uint8_t dtrace_class_t;		/* architectural dependency class */
+
+#define	DTRACE_STABILITY_INTERNAL	0	/* private to DTrace itself */
+#define	DTRACE_STABILITY_PRIVATE	1	/* private to Sun (see docs) */
+#define	DTRACE_STABILITY_OBSOLETE	2	/* scheduled for removal */
+#define	DTRACE_STABILITY_EXTERNAL	3	/* not controlled by Sun */
+#define	DTRACE_STABILITY_UNSTABLE	4	/* new or rapidly changing */
+#define	DTRACE_STABILITY_EVOLVING	5	/* less rapidly changing */
+#define	DTRACE_STABILITY_STABLE		6	/* mature interface from Sun */
+#define	DTRACE_STABILITY_STANDARD	7	/* industry standard */
+#define	DTRACE_STABILITY_MAX		7	/* maximum valid stability */
+
+#define	DTRACE_CLASS_UNKNOWN	0	/* unknown architectural dependency */
+#define	DTRACE_CLASS_CPU	1	/* CPU-module-specific */
+#define	DTRACE_CLASS_PLATFORM	2	/* platform-specific (uname -i) */
+#define	DTRACE_CLASS_GROUP	3	/* hardware-group-specific (uname -m) */
+#define	DTRACE_CLASS_ISA	4	/* ISA-specific (uname -p) */
+#define	DTRACE_CLASS_COMMON	5	/* common to all systems */
+#define	DTRACE_CLASS_MAX	5	/* maximum valid class */
+
+#define	DTRACE_PRIV_NONE	0x0000
+#define	DTRACE_PRIV_KERNEL	0x0001
+#define	DTRACE_PRIV_USER	0x0002
+#define	DTRACE_PRIV_PROC	0x0004
+#define	DTRACE_PRIV_OWNER	0x0008
+#define	DTRACE_PRIV_ZONEOWNER	0x0010
+
+#define	DTRACE_PRIV_ALL	\
+	(DTRACE_PRIV_KERNEL | DTRACE_PRIV_USER | \
+	DTRACE_PRIV_PROC | DTRACE_PRIV_OWNER | DTRACE_PRIV_ZONEOWNER)
+
+typedef struct dtrace_ppriv {
+	uint32_t dtpp_flags;			/* privilege flags */
+	uid_t dtpp_uid;				/* user ID */
+	zoneid_t dtpp_zoneid;			/* zone ID */
+} dtrace_ppriv_t;
+
+typedef struct dtrace_attribute {
+	dtrace_stability_t dtat_name;		/* entity name stability */
+	dtrace_stability_t dtat_data;		/* entity data stability */
+	dtrace_class_t dtat_class;		/* entity data dependency */
+} dtrace_attribute_t;
+
+typedef struct dtrace_pattr {
+	dtrace_attribute_t dtpa_provider;	/* provider attributes */
+	dtrace_attribute_t dtpa_mod;		/* module attributes */
+	dtrace_attribute_t dtpa_func;		/* function attributes */
+	dtrace_attribute_t dtpa_name;		/* name attributes */
+	dtrace_attribute_t dtpa_args;		/* args[] attributes */
+} dtrace_pattr_t;
+
+typedef struct dtrace_providerdesc {
+	char dtvd_name[DTRACE_PROVNAMELEN];	/* provider name */
+	dtrace_pattr_t dtvd_attr;		/* stability attributes */
+	dtrace_ppriv_t dtvd_priv;		/* privileges required */
+} dtrace_providerdesc_t;
+
+/*
+ * DTrace Pseudodevice Interface
+ *
+ * DTrace is controlled through ioctl(2)'s to the in-kernel dtrace:dtrace
+ * pseudodevice driver.  These ioctls comprise the user-kernel interface to
+ * DTrace.
+ */
+#define	DTRACEIOC		(('d' << 24) | ('t' << 16) | ('r' << 8))
+#define	DTRACEIOC_PROVIDER	(DTRACEIOC | 1)		/* provider query */
+#define	DTRACEIOC_PROBES	(DTRACEIOC | 2)		/* probe query */
+#define	DTRACEIOC_BUFSNAP	(DTRACEIOC | 4)		/* snapshot buffer */
+#define	DTRACEIOC_PROBEMATCH	(DTRACEIOC | 5)		/* match probes */
+#define	DTRACEIOC_ENABLE	(DTRACEIOC | 6)		/* enable probes */
+#define	DTRACEIOC_AGGSNAP	(DTRACEIOC | 7)		/* snapshot agg. */
+#define	DTRACEIOC_EPROBE	(DTRACEIOC | 8)		/* get eprobe desc. */
+#define	DTRACEIOC_PROBEARG	(DTRACEIOC | 9)		/* get probe arg */
+#define	DTRACEIOC_CONF		(DTRACEIOC | 10)	/* get config. */
+#define	DTRACEIOC_STATUS	(DTRACEIOC | 11)	/* get status */
+#define	DTRACEIOC_GO		(DTRACEIOC | 12)	/* start tracing */
+#define	DTRACEIOC_STOP		(DTRACEIOC | 13)	/* stop tracing */
+#define	DTRACEIOC_AGGDESC	(DTRACEIOC | 15)	/* get agg. desc. */
+#define	DTRACEIOC_FORMAT	(DTRACEIOC | 16)	/* get format str */
+#define	DTRACEIOC_DOFGET	(DTRACEIOC | 17)	/* get DOF */
+#define	DTRACEIOC_REPLICATE	(DTRACEIOC | 18)	/* replicate enab */
+
+/*
+ * DTrace Helpers
+ *
+ * In general, DTrace establishes probes in processes and takes actions on
+ * processes without knowing their specific user-level structures.  Instead of
+ * existing in the framework, process-specific knowledge is contained by the
+ * enabling D program -- which can apply process-specific knowledge by making
+ * appropriate use of DTrace primitives like copyin() and copyinstr() to
+ * operate on user-level data.  However, there may exist some specific probes
+ * of particular semantic relevance that the application developer may wish to
+ * explicitly export.  For example, an application may wish to export a probe
+ * at the point that it begins and ends certain well-defined transactions.  In
+ * addition to providing probes, programs may wish to offer assistance for
+ * certain actions.  For example, in highly dynamic environments (e.g., Java),
+ * it may be difficult to obtain a stack trace in terms of meaningful symbol
+ * names (the translation from instruction addresses to corresponding symbol
+ * names may only be possible in situ); these environments may wish to define
+ * a series of actions to be applied in situ to obtain a meaningful stack
+ * trace.
+ *
+ * These two mechanisms -- user-level statically defined tracing and assisting
+ * DTrace actions -- are provided via DTrace _helpers_.  Helpers are specified
+ * via DOF, but unlike enabling DOF, helper DOF may contain definitions of
+ * providers, probes and their arguments.  If a helper wishes to provide
+ * action assistance, probe descriptions and corresponding DIF actions may be
+ * specified in the helper DOF.  For such helper actions, however, the probe
+ * description describes the specific helper:  all DTrace helpers have the
+ * provider name "dtrace" and the module name "helper", and the name of the
+ * helper is contained in the function name (for example, the ustack() helper
+ * is named "ustack").  Any helper-specific name may be contained in the name
+ * (for example, if a helper were to have a constructor, it might be named
+ * "dtrace:helper:<helper>:init").  Helper actions are only called when the
+ * action that they are helping is taken.  Helper actions may only return DIF
+ * expressions, and may only call the following subroutines:
+ *
+ *    alloca()      <= Allocates memory out of the consumer's scratch space
+ *    bcopy()       <= Copies memory to scratch space
+ *    copyin()      <= Copies memory from user-level into consumer's scratch
+ *    copyinto()    <= Copies memory into a specific location in scratch
+ *    copyinstr()   <= Copies a string into a specific location in scratch
+ *
+ * Helper actions may only access the following built-in variables:
+ *
+ *    curthread     <= Current kthread_t pointer
+ *    tid           <= Current thread identifier
+ *    pid           <= Current process identifier
+ *    ppid          <= Parent process identifier
+ *    uid           <= Current user ID
+ *    gid           <= Current group ID
+ *    execname      <= Current executable name
+ *    zonename      <= Current zone name
+ *
+ * Helper actions may not manipulate or allocate dynamic variables, but they
+ * may have clause-local and statically-allocated global variables.  The
+ * helper action variable state is specific to the helper action -- variables
+ * used by the helper action may not be accessed outside of the helper
+ * action, and the helper action may not access variables that like outside
+ * of it.  Helper actions may not load from kernel memory at-large; they are
+ * restricting to loading current user state (via copyin() and variants) and
+ * scratch space.  As with probe enablings, helper actions are executed in
+ * program order.  The result of the helper action is the result of the last
+ * executing helper expression.
+ *
+ * Helpers -- composed of either providers/probes or probes/actions (or both)
+ * -- are added by opening the "helper" minor node, and issuing an ioctl(2)
+ * (DTRACEHIOC_ADDDOF) that specifies the dof_helper_t structure. This
+ * encapsulates the name and base address of the user-level library or
+ * executable publishing the helpers and probes as well as the DOF that
+ * contains the definitions of those helpers and probes.
+ *
+ * The DTRACEHIOC_ADD and DTRACEHIOC_REMOVE are left in place for legacy
+ * helpers and should no longer be used.  No other ioctls are valid on the
+ * helper minor node.
+ */
+#define	DTRACEHIOC		(('d' << 24) | ('t' << 16) | ('h' << 8))
+#define	DTRACEHIOC_ADD		(DTRACEHIOC | 1)	/* add helper */
+#define	DTRACEHIOC_REMOVE	(DTRACEHIOC | 2)	/* remove helper */
+#define	DTRACEHIOC_ADDDOF	(DTRACEHIOC | 3)	/* add helper DOF */
+
+typedef struct dof_helper {
+	char dofhp_mod[DTRACE_MODNAMELEN];	/* executable or library name */
+	uint64_t dofhp_addr;			/* base address of object */
+	uint64_t dofhp_dof;			/* address of helper DOF */
+} dof_helper_t;
+
+#define	DTRACEMNR_DTRACE	"dtrace"	/* node for DTrace ops */
+#define	DTRACEMNR_HELPER	"helper"	/* node for helpers */
+#define	DTRACEMNRN_DTRACE	0		/* minor for DTrace ops */
+#define	DTRACEMNRN_HELPER	1		/* minor for helpers */
+#define	DTRACEMNRN_CLONE	2		/* first clone minor */
+
+#ifdef _KERNEL
+
+/*
+ * DTrace Provider API
+ *
+ * The following functions are implemented by the DTrace framework and are
+ * used to implement separate in-kernel DTrace providers.  Common functions
+ * are provided in uts/common/os/dtrace.c.  ISA-dependent subroutines are
+ * defined in uts/<isa>/dtrace/dtrace_asm.s or uts/<isa>/dtrace/dtrace_isa.c.
+ *
+ * The provider API has two halves:  the API that the providers consume from
+ * DTrace, and the API that providers make available to DTrace.
+ *
+ * 1 Framework-to-Provider API
+ *
+ * 1.1  Overview
+ *
+ * The Framework-to-Provider API is represented by the dtrace_pops structure
+ * that the provider passes to the framework when registering itself.  This
+ * structure consists of the following members:
+ *
+ *   dtps_provide()          <-- Provide all probes, all modules
+ *   dtps_provide_module()   <-- Provide all probes in specified module
+ *   dtps_enable()           <-- Enable specified probe
+ *   dtps_disable()          <-- Disable specified probe
+ *   dtps_suspend()          <-- Suspend specified probe
+ *   dtps_resume()           <-- Resume specified probe
+ *   dtps_getargdesc()       <-- Get the argument description for args[X]
+ *   dtps_getargval()        <-- Get the value for an argX or args[X] variable
+ *   dtps_usermode()         <-- Find out if the probe was fired in user mode
+ *   dtps_destroy()          <-- Destroy all state associated with this probe
+ *
+ * 1.2  void dtps_provide(void *arg, const dtrace_probedesc_t *spec)
+ *
+ * 1.2.1  Overview
+ *
+ *   Called to indicate that the provider should provide all probes.  If the
+ *   specified description is non-NULL, dtps_provide() is being called because
+ *   no probe matched a specified probe -- if the provider has the ability to
+ *   create custom probes, it may wish to create a probe that matches the
+ *   specified description.
+ *
+ * 1.2.2  Arguments and notes
+ *
+ *   The first argument is the cookie as passed to dtrace_register().  The
+ *   second argument is a pointer to a probe description that the provider may
+ *   wish to consider when creating custom probes.  The provider is expected to
+ *   call back into the DTrace framework via dtrace_probe_create() to create
+ *   any necessary probes.  dtps_provide() may be called even if the provider
+ *   has made available all probes; the provider should check the return value
+ *   of dtrace_probe_create() to handle this case.  Note that the provider need
+ *   not implement both dtps_provide() and dtps_provide_module(); see
+ *   "Arguments and Notes" for dtrace_register(), below.
+ *
+ * 1.2.3  Return value
+ *
+ *   None.
+ *
+ * 1.2.4  Caller's context
+ *
+ *   dtps_provide() is typically called from open() or ioctl() context, but may
+ *   be called from other contexts as well.  The DTrace framework is locked in
+ *   such a way that providers may not register or unregister.  This means that
+ *   the provider may not call any DTrace API that affects its registration with
+ *   the framework, including dtrace_register(), dtrace_unregister(),
+ *   dtrace_invalidate(), and dtrace_condense().  However, the context is such
+ *   that the provider may (and indeed, is expected to) call probe-related
+ *   DTrace routines, including dtrace_probe_create(), dtrace_probe_lookup(),
+ *   and dtrace_probe_arg().
+ *
+ * 1.3  void dtps_provide_module(void *arg, struct modctl *mp)
+ *
+ * 1.3.1  Overview
+ *
+ *   Called to indicate that the provider should provide all probes in the
+ *   specified module.
+ *
+ * 1.3.2  Arguments and notes
+ *
+ *   The first argument is the cookie as passed to dtrace_register().  The
+ *   second argument is a pointer to a modctl structure that indicates the
+ *   module for which probes should be created.
+ *
+ * 1.3.3  Return value
+ *
+ *   None.
+ *
+ * 1.3.4  Caller's context
+ *
+ *   dtps_provide_module() may be called from open() or ioctl() context, but
+ *   may also be called from a module loading context.  mod_lock is held, and
+ *   the DTrace framework is locked in such a way that providers may not
+ *   register or unregister.  This means that the provider may not call any
+ *   DTrace API that affects its registration with the framework, including
+ *   dtrace_register(), dtrace_unregister(), dtrace_invalidate(), and
+ *   dtrace_condense().  However, the context is such that the provider may (and
+ *   indeed, is expected to) call probe-related DTrace routines, including
+ *   dtrace_probe_create(), dtrace_probe_lookup(), and dtrace_probe_arg().  Note
+ *   that the provider need not implement both dtps_provide() and
+ *   dtps_provide_module(); see "Arguments and Notes" for dtrace_register(),
+ *   below.
+ *
+ * 1.4  void dtps_enable(void *arg, dtrace_id_t id, void *parg)
+ *
+ * 1.4.1  Overview
+ *
+ *   Called to enable the specified probe.
+ *
+ * 1.4.2  Arguments and notes
+ *
+ *   The first argument is the cookie as passed to dtrace_register().  The
+ *   second argument is the identifier of the probe to be enabled.  The third
+ *   argument is the probe argument as passed to dtrace_probe_create().
+ *   dtps_enable() will be called when a probe transitions from not being
+ *   enabled at all to having one or more ECB.  The number of ECBs associated
+ *   with the probe may change without subsequent calls into the provider.
+ *   When the number of ECBs drops to zero, the provider will be explicitly
+ *   told to disable the probe via dtps_disable().  dtrace_probe() should never
+ *   be called for a probe identifier that hasn't been explicitly enabled via
+ *   dtps_enable().
+ *
+ * 1.4.3  Return value
+ *
+ *   None.
+ *
+ * 1.4.4  Caller's context
+ *
+ *   The DTrace framework is locked in such a way that it may not be called
+ *   back into at all.  cpu_lock is held.  mod_lock is not held and may not
+ *   be acquired.
+ *
+ * 1.5  void dtps_disable(void *arg, dtrace_id_t id, void *parg)
+ *
+ * 1.5.1  Overview
+ *
+ *   Called to disable the specified probe.
+ *
+ * 1.5.2  Arguments and notes
+ *
+ *   The first argument is the cookie as passed to dtrace_register().  The
+ *   second argument is the identifier of the probe to be disabled.  The third
+ *   argument is the probe argument as passed to dtrace_probe_create().
+ *   dtps_disable() will be called when a probe transitions from being enabled
+ *   to having zero ECBs.  dtrace_probe() should never be called for a probe
+ *   identifier that has been explicitly enabled via dtps_disable().
+ *
+ * 1.5.3  Return value
+ *
+ *   None.
+ *
+ * 1.5.4  Caller's context
+ *
+ *   The DTrace framework is locked in such a way that it may not be called
+ *   back into at all.  cpu_lock is held.  mod_lock is not held and may not
+ *   be acquired.
+ *
+ * 1.6  void dtps_suspend(void *arg, dtrace_id_t id, void *parg)
+ *
+ * 1.6.1  Overview
+ *
+ *   Called to suspend the specified enabled probe.  This entry point is for
+ *   providers that may need to suspend some or all of their probes when CPUs
+ *   are being powered on or when the boot monitor is being entered for a
+ *   prolonged period of time.
+ *
+ * 1.6.2  Arguments and notes
+ *
+ *   The first argument is the cookie as passed to dtrace_register().  The
+ *   second argument is the identifier of the probe to be suspended.  The
+ *   third argument is the probe argument as passed to dtrace_probe_create().
+ *   dtps_suspend will only be called on an enabled probe.  Providers that
+ *   provide a dtps_suspend entry point will want to take roughly the action
+ *   that it takes for dtps_disable.
+ *
+ * 1.6.3  Return value
+ *
+ *   None.
+ *
+ * 1.6.4  Caller's context
+ *
+ *   Interrupts are disabled.  The DTrace framework is in a state such that the
+ *   specified probe cannot be disabled or destroyed for the duration of
+ *   dtps_suspend().  As interrupts are disabled, the provider is afforded
+ *   little latitude; the provider is expected to do no more than a store to
+ *   memory.
+ *
+ * 1.7  void dtps_resume(void *arg, dtrace_id_t id, void *parg)
+ *
+ * 1.7.1  Overview
+ *
+ *   Called to resume the specified enabled probe.  This entry point is for
+ *   providers that may need to resume some or all of their probes after the
+ *   completion of an event that induced a call to dtps_suspend().
+ *
+ * 1.7.2  Arguments and notes
+ *
+ *   The first argument is the cookie as passed to dtrace_register().  The
+ *   second argument is the identifier of the probe to be resumed.  The
+ *   third argument is the probe argument as passed to dtrace_probe_create().
+ *   dtps_resume will only be called on an enabled probe.  Providers that
+ *   provide a dtps_resume entry point will want to take roughly the action
+ *   that it takes for dtps_enable.
+ *
+ * 1.7.3  Return value
+ *
+ *   None.
+ *
+ * 1.7.4  Caller's context
+ *
+ *   Interrupts are disabled.  The DTrace framework is in a state such that the
+ *   specified probe cannot be disabled or destroyed for the duration of
+ *   dtps_resume().  As interrupts are disabled, the provider is afforded
+ *   little latitude; the provider is expected to do no more than a store to
+ *   memory.
+ *
+ * 1.8  void dtps_getargdesc(void *arg, dtrace_id_t id, void *parg,
+ *           dtrace_argdesc_t *desc)
+ *
+ * 1.8.1  Overview
+ *
+ *   Called to retrieve the argument description for an args[X] variable.
+ *
+ * 1.8.2  Arguments and notes
+ *
+ *   The first argument is the cookie as passed to dtrace_register(). The
+ *   second argument is the identifier of the current probe. The third
+ *   argument is the probe argument as passed to dtrace_probe_create(). The
+ *   fourth argument is a pointer to the argument description.  This
+ *   description is both an input and output parameter:  it contains the
+ *   index of the desired argument in the dtargd_ndx field, and expects
+ *   the other fields to be filled in upon return.  If there is no argument
+ *   corresponding to the specified index, the dtargd_ndx field should be set
+ *   to DTRACE_ARGNONE.
+ *
+ * 1.8.3  Return value
+ *
+ *   None.  The dtargd_ndx, dtargd_native, dtargd_xlate and dtargd_mapping
+ *   members of the dtrace_argdesc_t structure are all output values.
+ *
+ * 1.8.4  Caller's context
+ *
+ *   dtps_getargdesc() is called from ioctl() context. mod_lock is held, and
+ *   the DTrace framework is locked in such a way that providers may not
+ *   register or unregister.  This means that the provider may not call any
+ *   DTrace API that affects its registration with the framework, including
+ *   dtrace_register(), dtrace_unregister(), dtrace_invalidate(), and
+ *   dtrace_condense().
+ *
+ * 1.9  uint64_t dtps_getargval(void *arg, dtrace_id_t id, void *parg,
+ *               int argno, int aframes)
+ *
+ * 1.9.1  Overview
+ *
+ *   Called to retrieve a value for an argX or args[X] variable.
+ *
+ * 1.9.2  Arguments and notes
+ *
+ *   The first argument is the cookie as passed to dtrace_register(). The
+ *   second argument is the identifier of the current probe. The third
+ *   argument is the probe argument as passed to dtrace_probe_create(). The
+ *   fourth argument is the number of the argument (the X in the example in
+ *   1.9.1). The fifth argument is the number of stack frames that were used
+ *   to get from the actual place in the code that fired the probe to
+ *   dtrace_probe() itself, the so-called artificial frames. This argument may
+ *   be used to descend an appropriate number of frames to find the correct
+ *   values. If this entry point is left NULL, the dtrace_getarg() built-in
+ *   function is used.
+ *
+ * 1.9.3  Return value
+ *
+ *   The value of the argument.
+ *
+ * 1.9.4  Caller's context
+ *
+ *   This is called from within dtrace_probe() meaning that interrupts
+ *   are disabled. No locks should be taken within this entry point.
+ *
+ * 1.10  int dtps_usermode(void *arg, dtrace_id_t id, void *parg)
+ *
+ * 1.10.1  Overview
+ *
+ *   Called to determine if the probe was fired in a user context.
+ *
+ * 1.10.2  Arguments and notes
+ *
+ *   The first argument is the cookie as passed to dtrace_register(). The
+ *   second argument is the identifier of the current probe. The third
+ *   argument is the probe argument as passed to dtrace_probe_create().  This
+ *   entry point must not be left NULL for providers whose probes allow for
+ *   mixed mode tracing, that is to say those probes that can fire during
+ *   kernel- _or_ user-mode execution
+ *
+ * 1.10.3  Return value
+ *
+ *   A boolean value.
+ *
+ * 1.10.4  Caller's context
+ *
+ *   This is called from within dtrace_probe() meaning that interrupts
+ *   are disabled. No locks should be taken within this entry point.
+ *
+ * 1.11 void dtps_destroy(void *arg, dtrace_id_t id, void *parg)
+ *
+ * 1.11.1 Overview
+ *
+ *   Called to destroy the specified probe.
+ *
+ * 1.11.2 Arguments and notes
+ *
+ *   The first argument is the cookie as passed to dtrace_register().  The
+ *   second argument is the identifier of the probe to be destroyed.  The third
+ *   argument is the probe argument as passed to dtrace_probe_create().  The
+ *   provider should free all state associated with the probe.  The framework
+ *   guarantees that dtps_destroy() is only called for probes that have either
+ *   been disabled via dtps_disable() or were never enabled via dtps_enable().
+ *   Once dtps_disable() has been called for a probe, no further call will be
+ *   made specifying the probe.
+ *
+ * 1.11.3 Return value
+ *
+ *   None.
+ *
+ * 1.11.4 Caller's context
+ *
+ *   The DTrace framework is locked in such a way that it may not be called
+ *   back into at all.  mod_lock is held.  cpu_lock is not held, and may not be
+ *   acquired.
+ *
+ *
+ * 2 Provider-to-Framework API
+ *
+ * 2.1  Overview
+ *
+ * The Provider-to-Framework API provides the mechanism for the provider to
+ * register itself with the DTrace framework, to create probes, to lookup
+ * probes and (most importantly) to fire probes.  The Provider-to-Framework
+ * consists of:
+ *
+ *   dtrace_register()       <-- Register a provider with the DTrace framework
+ *   dtrace_unregister()     <-- Remove a provider's DTrace registration
+ *   dtrace_invalidate()     <-- Invalidate the specified provider
+ *   dtrace_condense()       <-- Remove a provider's unenabled probes
+ *   dtrace_attached()       <-- Indicates whether or not DTrace has attached
+ *   dtrace_probe_create()   <-- Create a DTrace probe
+ *   dtrace_probe_lookup()   <-- Lookup a DTrace probe based on its name
+ *   dtrace_probe_arg()      <-- Return the probe argument for a specific probe
+ *   dtrace_probe()          <-- Fire the specified probe
+ *
+ * 2.2  int dtrace_register(const char *name, const dtrace_pattr_t *pap,
+ *          uint32_t priv, cred_t *cr, const dtrace_pops_t *pops, void *arg,
+ *          dtrace_provider_id_t *idp)
+ *
+ * 2.2.1  Overview
+ *
+ *   dtrace_register() registers the calling provider with the DTrace
+ *   framework.  It should generally be called by DTrace providers in their
+ *   attach(9E) entry point.
+ *
+ * 2.2.2  Arguments and Notes
+ *
+ *   The first argument is the name of the provider.  The second argument is a
+ *   pointer to the stability attributes for the provider.  The third argument
+ *   is the privilege flags for the provider, and must be some combination of:
+ *
+ *     DTRACE_PRIV_NONE     <= All users may enable probes from this provider
+ *
+ *     DTRACE_PRIV_PROC     <= Any user with privilege of PRIV_DTRACE_PROC may
+ *                             enable probes from this provider
+ *
+ *     DTRACE_PRIV_USER     <= Any user with privilege of PRIV_DTRACE_USER may
+ *                             enable probes from this provider
+ *
+ *     DTRACE_PRIV_KERNEL   <= Any user with privilege of PRIV_DTRACE_KERNEL
+ *                             may enable probes from this provider
+ *
+ *     DTRACE_PRIV_OWNER    <= This flag places an additional constraint on
+ *                             the privilege requirements above. These probes
+ *                             require either (a) a user ID matching the user
+ *                             ID of the cred passed in the fourth argument
+ *                             or (b) the PRIV_PROC_OWNER privilege.
+ *
+ *     DTRACE_PRIV_ZONEOWNER<= This flag places an additional constraint on
+ *                             the privilege requirements above. These probes
+ *                             require either (a) a zone ID matching the zone
+ *                             ID of the cred passed in the fourth argument
+ *                             or (b) the PRIV_PROC_ZONE privilege.
+ *
+ *   Note that these flags designate the _visibility_ of the probes, not
+ *   the conditions under which they may or may not fire.
+ *
+ *   The fourth argument is the credential that is associated with the
+ *   provider.  This argument should be NULL if the privilege flags don't
+ *   include DTRACE_PRIV_OWNER or DTRACE_PRIV_ZONEOWNER.  If non-NULL, the
+ *   framework stashes the uid and zoneid represented by this credential
+ *   for use at probe-time, in implicit predicates.  These limit visibility
+ *   of the probes to users and/or zones which have sufficient privilege to
+ *   access them.
+ *
+ *   The fifth argument is a DTrace provider operations vector, which provides
+ *   the implementation for the Framework-to-Provider API.  (See Section 1,
+ *   above.)  This must be non-NULL, and each member must be non-NULL.  The
+ *   exceptions to this are (1) the dtps_provide() and dtps_provide_module()
+ *   members (if the provider so desires, _one_ of these members may be left
+ *   NULL -- denoting that the provider only implements the other) and (2)
+ *   the dtps_suspend() and dtps_resume() members, which must either both be
+ *   NULL or both be non-NULL.
+ *
+ *   The sixth argument is a cookie to be specified as the first argument for
+ *   each function in the Framework-to-Provider API.  This argument may have
+ *   any value.
+ *
+ *   The final argument is a pointer to dtrace_provider_id_t.  If
+ *   dtrace_register() successfully completes, the provider identifier will be
+ *   stored in the memory pointed to be this argument.  This argument must be
+ *   non-NULL.
+ *
+ * 2.2.3  Return value
+ *
+ *   On success, dtrace_register() returns 0 and stores the new provider's
+ *   identifier into the memory pointed to by the idp argument.  On failure,
+ *   dtrace_register() returns an errno:
+ *
+ *     EINVAL   The arguments passed to dtrace_register() were somehow invalid.
+ *              This may because a parameter that must be non-NULL was NULL,
+ *              because the name was invalid (either empty or an illegal
+ *              provider name) or because the attributes were invalid.
+ *
+ *   No other failure code is returned.
+ *
+ * 2.2.4  Caller's context
+ *
+ *   dtrace_register() may induce calls to dtrace_provide(); the provider must
+ *   hold no locks across dtrace_register() that may also be acquired by
+ *   dtrace_provide().  cpu_lock and mod_lock must not be held.
+ *
+ * 2.3  int dtrace_unregister(dtrace_provider_t id)
+ *
+ * 2.3.1  Overview
+ *
+ *   Unregisters the specified provider from the DTrace framework.  It should
+ *   generally be called by DTrace providers in their detach(9E) entry point.
+ *
+ * 2.3.2  Arguments and Notes
+ *
+ *   The only argument is the provider identifier, as returned from a
+ *   successful call to dtrace_register().  As a result of calling
+ *   dtrace_unregister(), the DTrace framework will call back into the provider
+ *   via the dtps_destroy() entry point.  Once dtrace_unregister() successfully
+ *   completes, however, the DTrace framework will no longer make calls through
+ *   the Framework-to-Provider API.
+ *
+ * 2.3.3  Return value
+ *
+ *   On success, dtrace_unregister returns 0.  On failure, dtrace_unregister()
+ *   returns an errno:
+ *
+ *     EBUSY    There are currently processes that have the DTrace pseudodevice
+ *              open, or there exists an anonymous enabling that hasn't yet
+ *              been claimed.
+ *
+ *   No other failure code is returned.
+ *
+ * 2.3.4  Caller's context
+ *
+ *   Because a call to dtrace_unregister() may induce calls through the
+ *   Framework-to-Provider API, the caller may not hold any lock across
+ *   dtrace_register() that is also acquired in any of the Framework-to-
+ *   Provider API functions.  Additionally, mod_lock may not be held.
+ *
+ * 2.4  void dtrace_invalidate(dtrace_provider_id_t id)
+ *
+ * 2.4.1  Overview
+ *
+ *   Invalidates the specified provider.  All subsequent probe lookups for the
+ *   specified provider will fail, but its probes will not be removed.
+ *
+ * 2.4.2  Arguments and note
+ *
+ *   The only argument is the provider identifier, as returned from a
+ *   successful call to dtrace_register().  In general, a provider's probes
+ *   always remain valid; dtrace_invalidate() is a mechanism for invalidating
+ *   an entire provider, regardless of whether or not probes are enabled or
+ *   not.  Note that dtrace_invalidate() will _not_ prevent already enabled
+ *   probes from firing -- it will merely prevent any new enablings of the
+ *   provider's probes.
+ *
+ * 2.5 int dtrace_condense(dtrace_provider_id_t id)
+ *
+ * 2.5.1  Overview
+ *
+ *   Removes all the unenabled probes for the given provider. This function is
+ *   not unlike dtrace_unregister(), except that it doesn't remove the
+ *   provider just as many of its associated probes as it can.
+ *
+ * 2.5.2  Arguments and Notes
+ *
+ *   As with dtrace_unregister(), the sole argument is the provider identifier
+ *   as returned from a successful call to dtrace_register().  As a result of
+ *   calling dtrace_condense(), the DTrace framework will call back into the
+ *   given provider's dtps_destroy() entry point for each of the provider's
+ *   unenabled probes.
+ *
+ * 2.5.3  Return value
+ *
+ *   Currently, dtrace_condense() always returns 0.  However, consumers of this
+ *   function should check the return value as appropriate; its behavior may
+ *   change in the future.
+ *
+ * 2.5.4  Caller's context
+ *
+ *   As with dtrace_unregister(), the caller may not hold any lock across
+ *   dtrace_condense() that is also acquired in the provider's entry points.
+ *   Also, mod_lock may not be held.
+ *
+ * 2.6 int dtrace_attached()
+ *
+ * 2.6.1  Overview
+ *
+ *   Indicates whether or not DTrace has attached.
+ *
+ * 2.6.2  Arguments and Notes
+ *
+ *   For most providers, DTrace makes initial contact beyond registration.
+ *   That is, once a provider has registered with DTrace, it waits to hear
+ *   from DTrace to create probes.  However, some providers may wish to
+ *   proactively create probes without first being told by DTrace to do so.
+ *   If providers wish to do this, they must first call dtrace_attached() to
+ *   determine if DTrace itself has attached.  If dtrace_attached() returns 0,
+ *   the provider must not make any other Provider-to-Framework API call.
+ *
+ * 2.6.3  Return value
+ *
+ *   dtrace_attached() returns 1 if DTrace has attached, 0 otherwise.
+ *
+ * 2.7  int dtrace_probe_create(dtrace_provider_t id, const char *mod,
+ *	    const char *func, const char *name, int aframes, void *arg)
+ *
+ * 2.7.1  Overview
+ *
+ *   Creates a probe with specified module name, function name, and name.
+ *
+ * 2.7.2  Arguments and Notes
+ *
+ *   The first argument is the provider identifier, as returned from a
+ *   successful call to dtrace_register().  The second, third, and fourth
+ *   arguments are the module name, function name, and probe name,
+ *   respectively.  Of these, module name and function name may both be NULL
+ *   (in which case the probe is considered to be unanchored), or they may both
+ *   be non-NULL.  The name must be non-NULL, and must point to a non-empty
+ *   string.
+ *
+ *   The fifth argument is the number of artificial stack frames that will be
+ *   found on the stack when dtrace_probe() is called for the new probe.  These
+ *   artificial frames will be automatically be pruned should the stack() or
+ *   stackdepth() functions be called as part of one of the probe's ECBs.  If
+ *   the parameter doesn't add an artificial frame, this parameter should be
+ *   zero.
+ *
+ *   The final argument is a probe argument that will be passed back to the
+ *   provider when a probe-specific operation is called.  (e.g., via
+ *   dtps_enable(), dtps_disable(), etc.)
+ *
+ *   Note that it is up to the provider to be sure that the probe that it
+ *   creates does not already exist -- if the provider is unsure of the probe's
+ *   existence, it should assure its absence with dtrace_probe_lookup() before
+ *   calling dtrace_probe_create().
+ *
+ * 2.7.3  Return value
+ *
+ *   dtrace_probe_create() always succeeds, and always returns the identifier
+ *   of the newly-created probe.
+ *
+ * 2.7.4  Caller's context
+ *
+ *   While dtrace_probe_create() is generally expected to be called from
+ *   dtps_provide() and/or dtps_provide_module(), it may be called from other
+ *   non-DTrace contexts.  Neither cpu_lock nor mod_lock may be held.
+ *
+ * 2.8  dtrace_id_t dtrace_probe_lookup(dtrace_provider_t id, const char *mod,
+ *	    const char *func, const char *name)
+ *
+ * 2.8.1  Overview
+ *
+ *   Looks up a probe based on provdider and one or more of module name,
+ *   function name and probe name.
+ *
+ * 2.8.2  Arguments and Notes
+ *
+ *   The first argument is the provider identifier, as returned from a
+ *   successful call to dtrace_register().  The second, third, and fourth
+ *   arguments are the module name, function name, and probe name,
+ *   respectively.  Any of these may be NULL; dtrace_probe_lookup() will return
+ *   the identifier of the first probe that is provided by the specified
+ *   provider and matches all of the non-NULL matching criteria.
+ *   dtrace_probe_lookup() is generally used by a provider to be check the
+ *   existence of a probe before creating it with dtrace_probe_create().
+ *
+ * 2.8.3  Return value
+ *
+ *   If the probe exists, returns its identifier.  If the probe does not exist,
+ *   return DTRACE_IDNONE.
+ *
+ * 2.8.4  Caller's context
+ *
+ *   While dtrace_probe_lookup() is generally expected to be called from
+ *   dtps_provide() and/or dtps_provide_module(), it may also be called from
+ *   other non-DTrace contexts.  Neither cpu_lock nor mod_lock may be held.
+ *
+ * 2.9  void *dtrace_probe_arg(dtrace_provider_t id, dtrace_id_t probe)
+ *
+ * 2.9.1  Overview
+ *
+ *   Returns the probe argument associated with the specified probe.
+ *
+ * 2.9.2  Arguments and Notes
+ *
+ *   The first argument is the provider identifier, as returned from a
+ *   successful call to dtrace_register().  The second argument is a probe
+ *   identifier, as returned from dtrace_probe_lookup() or
+ *   dtrace_probe_create().  This is useful if a probe has multiple
+ *   provider-specific components to it:  the provider can create the probe
+ *   once with provider-specific state, and then add to the state by looking
+ *   up the probe based on probe identifier.
+ *
+ * 2.9.3  Return value
+ *
+ *   Returns the argument associated with the specified probe.  If the
+ *   specified probe does not exist, or if the specified probe is not provided
+ *   by the specified provider, NULL is returned.
+ *
+ * 2.9.4  Caller's context
+ *
+ *   While dtrace_probe_arg() is generally expected to be called from
+ *   dtps_provide() and/or dtps_provide_module(), it may also be called from
+ *   other non-DTrace contexts.  Neither cpu_lock nor mod_lock may be held.
+ *
+ * 2.10  void dtrace_probe(dtrace_id_t probe, uintptr_t arg0, uintptr_t arg1,
+ *		uintptr_t arg2, uintptr_t arg3, uintptr_t arg4)
+ *
+ * 2.10.1  Overview
+ *
+ *   The epicenter of DTrace:  fires the specified probes with the specified
+ *   arguments.
+ *
+ * 2.10.2  Arguments and Notes
+ *
+ *   The first argument is a probe identifier as returned by
+ *   dtrace_probe_create() or dtrace_probe_lookup().  The second through sixth
+ *   arguments are the values to which the D variables "arg0" through "arg4"
+ *   will be mapped.
+ *
+ *   dtrace_probe() should be called whenever the specified probe has fired --
+ *   however the provider defines it.
+ *
+ * 2.10.3  Return value
+ *
+ *   None.
+ *
+ * 2.10.4  Caller's context
+ *
+ *   dtrace_probe() may be called in virtually any context:  kernel, user,
+ *   interrupt, high-level interrupt, with arbitrary adaptive locks held, with
+ *   dispatcher locks held, with interrupts disabled, etc.  The only latitude
+ *   that must be afforded to DTrace is the ability to make calls within
+ *   itself (and to its in-kernel subroutines) and the ability to access
+ *   arbitrary (but mapped) memory.  On some platforms, this constrains
+ *   context.  For example, on UltraSPARC, dtrace_probe() cannot be called
+ *   from any context in which TL is greater than zero.  dtrace_probe() may
+ *   also not be called from any routine which may be called by dtrace_probe()
+ *   -- which includes functions in the DTrace framework and some in-kernel
+ *   DTrace subroutines.  All such functions "dtrace_"; providers that
+ *   instrument the kernel arbitrarily should be sure to not instrument these
+ *   routines.
+ */
+typedef struct dtrace_pops {
+	void (*dtps_provide)(void *arg, const dtrace_probedesc_t *spec);
+	void (*dtps_provide_module)(void *arg, struct modctl *mp);
+	void (*dtps_enable)(void *arg, dtrace_id_t id, void *parg);
+	void (*dtps_disable)(void *arg, dtrace_id_t id, void *parg);
+	void (*dtps_suspend)(void *arg, dtrace_id_t id, void *parg);
+	void (*dtps_resume)(void *arg, dtrace_id_t id, void *parg);
+	void (*dtps_getargdesc)(void *arg, dtrace_id_t id, void *parg,
+	    dtrace_argdesc_t *desc);
+	uint64_t (*dtps_getargval)(void *arg, dtrace_id_t id, void *parg,
+	    int argno, int aframes);
+	int (*dtps_usermode)(void *arg, dtrace_id_t id, void *parg);
+	void (*dtps_destroy)(void *arg, dtrace_id_t id, void *parg);
+} dtrace_pops_t;
+
+typedef uintptr_t	dtrace_provider_id_t;
+
+extern int dtrace_register(const char *, const dtrace_pattr_t *, uint32_t,
+    cred_t *, const dtrace_pops_t *, void *, dtrace_provider_id_t *);
+extern int dtrace_unregister(dtrace_provider_id_t);
+extern int dtrace_condense(dtrace_provider_id_t);
+extern void dtrace_invalidate(dtrace_provider_id_t);
+extern dtrace_id_t dtrace_probe_lookup(dtrace_provider_id_t, const char *,
+    const char *, const char *);
+extern dtrace_id_t dtrace_probe_create(dtrace_provider_id_t, const char *,
+    const char *, const char *, int, void *);
+extern void *dtrace_probe_arg(dtrace_provider_id_t, dtrace_id_t);
+extern void dtrace_probe(dtrace_id_t, uintptr_t arg0, uintptr_t arg1,
+    uintptr_t arg2, uintptr_t arg3, uintptr_t arg4);
+
+/*
+ * DTrace Meta Provider API
+ *
+ * The following functions are implemented by the DTrace framework and are
+ * used to implement meta providers. Meta providers plug into the DTrace
+ * framework and are used to instantiate new providers on the fly. At
+ * present, there is only one type of meta provider and only one meta
+ * provider may be registered with the DTrace framework at a time. The
+ * sole meta provider type provides user-land static tracing facilities
+ * by taking meta probe descriptions and adding a corresponding provider
+ * into the DTrace framework.
+ *
+ * 1 Framework-to-Provider
+ *
+ * 1.1 Overview
+ *
+ * The Framework-to-Provider API is represented by the dtrace_mops structure
+ * that the meta provider passes to the framework when registering itself as
+ * a meta provider. This structure consists of the following members:
+ *
+ *   dtms_create_probe()	<-- Add a new probe to a created provider
+ *   dtms_provide_pid()		<-- Create a new provider for a given process
+ *   dtms_remove_pid()		<-- Remove a previously created provider
+ *
+ * 1.2  void dtms_create_probe(void *arg, void *parg,
+ *           dtrace_helper_probedesc_t *probedesc);
+ *
+ * 1.2.1  Overview
+ *
+ *   Called by the DTrace framework to create a new probe in a provider
+ *   created by this meta provider.
+ *
+ * 1.2.2  Arguments and notes
+ *
+ *   The first argument is the cookie as passed to dtrace_meta_register().
+ *   The second argument is the provider cookie for the associated provider;
+ *   this is obtained from the return value of dtms_provide_pid(). The third
+ *   argument is the helper probe description.
+ *
+ * 1.2.3  Return value
+ *
+ *   None
+ *
+ * 1.2.4  Caller's context
+ *
+ *   dtms_create_probe() is called from either ioctl() or module load context.
+ *   The DTrace framework is locked in such a way that meta providers may not
+ *   register or unregister. This means that the meta provider cannot call
+ *   dtrace_meta_register() or dtrace_meta_unregister(). However, the context is
+ *   such that the provider may (and is expected to) call provider-related
+ *   DTrace provider APIs including dtrace_probe_create().
+ *
+ * 1.3  void *dtms_provide_pid(void *arg, dtrace_meta_provider_t *mprov,
+ *	      pid_t pid)
+ *
+ * 1.3.1  Overview
+ *
+ *   Called by the DTrace framework to instantiate a new provider given the
+ *   description of the provider and probes in the mprov argument. The
+ *   meta provider should call dtrace_register() to insert the new provider
+ *   into the DTrace framework.
+ *
+ * 1.3.2  Arguments and notes
+ *
+ *   The first argument is the cookie as passed to dtrace_meta_register().
+ *   The second argument is a pointer to a structure describing the new
+ *   helper provider. The third argument is the process identifier for
+ *   process associated with this new provider. Note that the name of the
+ *   provider as passed to dtrace_register() should be the contatenation of
+ *   the dtmpb_provname member of the mprov argument and the processs
+ *   identifier as a string.
+ *
+ * 1.3.3  Return value
+ *
+ *   The cookie for the provider that the meta provider creates. This is
+ *   the same value that it passed to dtrace_register().
+ *
+ * 1.3.4  Caller's context
+ *
+ *   dtms_provide_pid() is called from either ioctl() or module load context.
+ *   The DTrace framework is locked in such a way that meta providers may not
+ *   register or unregister. This means that the meta provider cannot call
+ *   dtrace_meta_register() or dtrace_meta_unregister(). However, the context
+ *   is such that the provider may -- and is expected to --  call
+ *   provider-related DTrace provider APIs including dtrace_register().
+ *
+ * 1.4  void dtms_remove_pid(void *arg, dtrace_meta_provider_t *mprov,
+ *	     pid_t pid)
+ *
+ * 1.4.1  Overview
+ *
+ *   Called by the DTrace framework to remove a provider that had previously
+ *   been instantiated via the dtms_provide_pid() entry point. The meta
+ *   provider need not remove the provider immediately, but this entry
+ *   point indicates that the provider should be removed as soon as possible
+ *   using the dtrace_unregister() API.
+ *
+ * 1.4.2  Arguments and notes
+ *
+ *   The first argument is the cookie as passed to dtrace_meta_register().
+ *   The second argument is a pointer to a structure describing the helper
+ *   provider. The third argument is the process identifier for process
+ *   associated with this new provider.
+ *
+ * 1.4.3  Return value
+ *
+ *   None
+ *
+ * 1.4.4  Caller's context
+ *
+ *   dtms_remove_pid() is called from either ioctl() or exit() context.
+ *   The DTrace framework is locked in such a way that meta providers may not
+ *   register or unregister. This means that the meta provider cannot call
+ *   dtrace_meta_register() or dtrace_meta_unregister(). However, the context
+ *   is such that the provider may -- and is expected to -- call
+ *   provider-related DTrace provider APIs including dtrace_unregister().
+ */
+typedef struct dtrace_helper_probedesc {
+	char *dthpb_mod;			/* probe module */
+	char *dthpb_func; 			/* probe function */
+	char *dthpb_name; 			/* probe name */
+	uint64_t dthpb_base;			/* base address */
+	uint32_t *dthpb_offs;			/* offsets array */
+	uint32_t *dthpb_enoffs;			/* is-enabled offsets array */
+	uint32_t dthpb_noffs;			/* offsets count */
+	uint32_t dthpb_nenoffs;			/* is-enabled offsets count */
+	uint8_t *dthpb_args;			/* argument mapping array */
+	uint8_t dthpb_xargc;			/* translated argument count */
+	uint8_t dthpb_nargc;			/* native argument count */
+	char *dthpb_xtypes;			/* translated types strings */
+	char *dthpb_ntypes;			/* native types strings */
+} dtrace_helper_probedesc_t;
+
+typedef struct dtrace_helper_provdesc {
+	char *dthpv_provname;			/* provider name */
+	dtrace_pattr_t dthpv_pattr;		/* stability attributes */
+} dtrace_helper_provdesc_t;
+
+typedef struct dtrace_mops {
+	void (*dtms_create_probe)(void *, void *, dtrace_helper_probedesc_t *);
+	void *(*dtms_provide_pid)(void *, dtrace_helper_provdesc_t *, pid_t);
+	void (*dtms_remove_pid)(void *, dtrace_helper_provdesc_t *, pid_t);
+} dtrace_mops_t;
+
+typedef uintptr_t	dtrace_meta_provider_id_t;
+
+extern int dtrace_meta_register(const char *, const dtrace_mops_t *, void *,
+    dtrace_meta_provider_id_t *);
+extern int dtrace_meta_unregister(dtrace_meta_provider_id_t);
+
+/*
+ * DTrace Kernel Hooks
+ *
+ * The following functions are implemented by the base kernel and form a set of
+ * hooks used by the DTrace framework.  DTrace hooks are implemented in either
+ * uts/common/os/dtrace_subr.c, an ISA-specific assembly file, or in a
+ * uts/<platform>/os/dtrace_subr.c corresponding to each hardware platform.
+ */
+
+typedef enum dtrace_vtime_state {
+	DTRACE_VTIME_INACTIVE = 0,	/* No DTrace, no TNF */
+	DTRACE_VTIME_ACTIVE,		/* DTrace virtual time, no TNF */
+	DTRACE_VTIME_INACTIVE_TNF,	/* No DTrace, TNF active */
+	DTRACE_VTIME_ACTIVE_TNF		/* DTrace virtual time _and_ TNF */
+} dtrace_vtime_state_t;
+
+extern dtrace_vtime_state_t dtrace_vtime_active;
+extern void dtrace_vtime_switch(kthread_t *next);
+extern void dtrace_vtime_enable_tnf(void);
+extern void dtrace_vtime_disable_tnf(void);
+extern void dtrace_vtime_enable(void);
+extern void dtrace_vtime_disable(void);
+
+struct regs;
+
+extern int (*dtrace_pid_probe_ptr)(struct regs *);
+extern int (*dtrace_return_probe_ptr)(struct regs *);
+extern void (*dtrace_fasttrap_fork_ptr)(proc_t *, proc_t *);
+extern void (*dtrace_fasttrap_exec_ptr)(proc_t *);
+extern void (*dtrace_fasttrap_exit_ptr)(proc_t *);
+extern void dtrace_fasttrap_fork(proc_t *, proc_t *);
+
+typedef uintptr_t dtrace_icookie_t;
+typedef void (*dtrace_xcall_t)(void *);
+
+extern dtrace_icookie_t dtrace_interrupt_disable(void);
+extern void dtrace_interrupt_enable(dtrace_icookie_t);
+
+extern void dtrace_membar_producer(void);
+extern void dtrace_membar_consumer(void);
+
+extern void (*dtrace_cpu_init)(processorid_t);
+extern void (*dtrace_modload)(struct modctl *);
+extern void (*dtrace_modunload)(struct modctl *);
+extern void (*dtrace_helpers_cleanup)();
+extern void (*dtrace_helpers_fork)(proc_t *parent, proc_t *child);
+extern void (*dtrace_cpustart_init)();
+extern void (*dtrace_cpustart_fini)();
+
+extern void (*dtrace_debugger_init)();
+extern void (*dtrace_debugger_fini)();
+extern dtrace_cacheid_t dtrace_predcache_id;
+
+extern hrtime_t dtrace_gethrtime(void);
+extern void dtrace_sync(void);
+extern void dtrace_toxic_ranges(void (*)(uintptr_t, uintptr_t));
+extern void dtrace_xcall(processorid_t, dtrace_xcall_t, void *);
+extern void dtrace_vpanic(const char *, __va_list);
+extern void dtrace_panic(const char *, ...);
+
+extern int dtrace_safe_defer_signal(void);
+extern void dtrace_safe_synchronous_signal(void);
+
+extern int dtrace_mach_aframes(void);
+
+#if defined(__i386) || defined(__amd64)
+extern int dtrace_instr_size(uchar_t *instr);
+extern int dtrace_instr_size_isa(uchar_t *, model_t, int *);
+extern void dtrace_invop_add(int (*)(uintptr_t, uintptr_t *, uintptr_t));
+extern void dtrace_invop_remove(int (*)(uintptr_t, uintptr_t *, uintptr_t));
+extern void dtrace_invop_callsite(void);
+#endif
+
+#ifdef __sparc
+extern int dtrace_blksuword32(uintptr_t, uint32_t *, int);
+extern void dtrace_getfsr(uint64_t *);
+#endif
+
+#define	DTRACE_CPUFLAG_ISSET(flag) \
+	(cpu_core[CPU->cpu_id].cpuc_dtrace_flags & (flag))
+
+#define	DTRACE_CPUFLAG_SET(flag) \
+	(cpu_core[CPU->cpu_id].cpuc_dtrace_flags |= (flag))
+
+#define	DTRACE_CPUFLAG_CLEAR(flag) \
+	(cpu_core[CPU->cpu_id].cpuc_dtrace_flags &= ~(flag))
+
+#endif /* _KERNEL */
+
+#endif	/* _ASM */
+
+#if defined(__i386) || defined(__amd64)
+
+#define	DTRACE_INVOP_PUSHL_EBP		1
+#define	DTRACE_INVOP_POPL_EBP		2
+#define	DTRACE_INVOP_LEAVE		3
+#define	DTRACE_INVOP_NOP		4
+#define	DTRACE_INVOP_RET		5
+
+#endif
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* _SYS_DTRACE_H */
diff --git a/cddl/contrib/opensolaris/uts/common/sys/dtrace_impl.h b/cddl/contrib/opensolaris/uts/common/sys/dtrace_impl.h
new file mode 100644
index 0000000..fed537e
--- /dev/null
+++ b/cddl/contrib/opensolaris/uts/common/sys/dtrace_impl.h
@@ -0,0 +1,1298 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef _SYS_DTRACE_IMPL_H
+#define	_SYS_DTRACE_IMPL_H
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/*
+ * DTrace Dynamic Tracing Software: Kernel Implementation Interfaces
+ *
+ * Note: The contents of this file are private to the implementation of the
+ * Solaris system and DTrace subsystem and are subject to change at any time
+ * without notice.  Applications and drivers using these interfaces will fail
+ * to run on future releases.  These interfaces should not be used for any
+ * purpose except those expressly outlined in dtrace(7D) and libdtrace(3LIB).
+ * Please refer to the "Solaris Dynamic Tracing Guide" for more information.
+ */
+
+#include <sys/dtrace.h>
+
+/*
+ * DTrace Implementation Constants and Typedefs
+ */
+#define	DTRACE_MAXPROPLEN		128
+#define	DTRACE_DYNVAR_CHUNKSIZE		256
+
+struct dtrace_probe;
+struct dtrace_ecb;
+struct dtrace_predicate;
+struct dtrace_action;
+struct dtrace_provider;
+struct dtrace_state;
+
+typedef struct dtrace_probe dtrace_probe_t;
+typedef struct dtrace_ecb dtrace_ecb_t;
+typedef struct dtrace_predicate dtrace_predicate_t;
+typedef struct dtrace_action dtrace_action_t;
+typedef struct dtrace_provider dtrace_provider_t;
+typedef struct dtrace_meta dtrace_meta_t;
+typedef struct dtrace_state dtrace_state_t;
+typedef uint32_t dtrace_optid_t;
+typedef uint32_t dtrace_specid_t;
+typedef uint64_t dtrace_genid_t;
+
+/*
+ * DTrace Probes
+ *
+ * The probe is the fundamental unit of the DTrace architecture.  Probes are
+ * created by DTrace providers, and managed by the DTrace framework.  A probe
+ * is identified by a unique <provider, module, function, name> tuple, and has
+ * a unique probe identifier assigned to it.  (Some probes are not associated
+ * with a specific point in text; these are called _unanchored probes_ and have
+ * no module or function associated with them.)  Probes are represented as a
+ * dtrace_probe structure.  To allow quick lookups based on each element of the
+ * probe tuple, probes are hashed by each of provider, module, function and
+ * name.  (If a lookup is performed based on a regular expression, a
+ * dtrace_probekey is prepared, and a linear search is performed.) Each probe
+ * is additionally pointed to by a linear array indexed by its identifier.  The
+ * identifier is the provider's mechanism for indicating to the DTrace
+ * framework that a probe has fired:  the identifier is passed as the first
+ * argument to dtrace_probe(), where it is then mapped into the corresponding
+ * dtrace_probe structure.  From the dtrace_probe structure, dtrace_probe() can
+ * iterate over the probe's list of enabling control blocks; see "DTrace
+ * Enabling Control Blocks", below.)
+ */
+struct dtrace_probe {
+	dtrace_id_t dtpr_id;			/* probe identifier */
+	dtrace_ecb_t *dtpr_ecb;			/* ECB list; see below */
+	dtrace_ecb_t *dtpr_ecb_last;		/* last ECB in list */
+	void *dtpr_arg;				/* provider argument */
+	dtrace_cacheid_t dtpr_predcache;	/* predicate cache ID */
+	int dtpr_aframes;			/* artificial frames */
+	dtrace_provider_t *dtpr_provider;	/* pointer to provider */
+	char *dtpr_mod;				/* probe's module name */
+	char *dtpr_func;			/* probe's function name */
+	char *dtpr_name;			/* probe's name */
+	dtrace_probe_t *dtpr_nextmod;		/* next in module hash */
+	dtrace_probe_t *dtpr_prevmod;		/* previous in module hash */
+	dtrace_probe_t *dtpr_nextfunc;		/* next in function hash */
+	dtrace_probe_t *dtpr_prevfunc;		/* previous in function hash */
+	dtrace_probe_t *dtpr_nextname;		/* next in name hash */
+	dtrace_probe_t *dtpr_prevname;		/* previous in name hash */
+	dtrace_genid_t dtpr_gen;		/* probe generation ID */
+};
+
+typedef int dtrace_probekey_f(const char *, const char *, int);
+
+typedef struct dtrace_probekey {
+	const char *dtpk_prov;			/* provider name to match */
+	dtrace_probekey_f *dtpk_pmatch;		/* provider matching function */
+	const char *dtpk_mod;			/* module name to match */
+	dtrace_probekey_f *dtpk_mmatch;		/* module matching function */
+	const char *dtpk_func;			/* func name to match */
+	dtrace_probekey_f *dtpk_fmatch;		/* func matching function */
+	const char *dtpk_name;			/* name to match */
+	dtrace_probekey_f *dtpk_nmatch;		/* name matching function */
+	dtrace_id_t dtpk_id;			/* identifier to match */
+} dtrace_probekey_t;
+
+typedef struct dtrace_hashbucket {
+	struct dtrace_hashbucket *dthb_next;	/* next on hash chain */
+	dtrace_probe_t *dthb_chain;		/* chain of probes */
+	int dthb_len;				/* number of probes here */
+} dtrace_hashbucket_t;
+
+typedef struct dtrace_hash {
+	dtrace_hashbucket_t **dth_tab;		/* hash table */
+	int dth_size;				/* size of hash table */
+	int dth_mask;				/* mask to index into table */
+	int dth_nbuckets;			/* total number of buckets */
+	uintptr_t dth_nextoffs;			/* offset of next in probe */
+	uintptr_t dth_prevoffs;			/* offset of prev in probe */
+	uintptr_t dth_stroffs;			/* offset of str in probe */
+} dtrace_hash_t;
+
+/*
+ * DTrace Enabling Control Blocks
+ *
+ * When a provider wishes to fire a probe, it calls into dtrace_probe(),
+ * passing the probe identifier as the first argument.  As described above,
+ * dtrace_probe() maps the identifier into a pointer to a dtrace_probe_t
+ * structure.  This structure contains information about the probe, and a
+ * pointer to the list of Enabling Control Blocks (ECBs).  Each ECB points to
+ * DTrace consumer state, and contains an optional predicate, and a list of
+ * actions.  (Shown schematically below.)  The ECB abstraction allows a single
+ * probe to be multiplexed across disjoint consumers, or across disjoint
+ * enablings of a single probe within one consumer.
+ *
+ *   Enabling Control Block
+ *        dtrace_ecb_t
+ * +------------------------+
+ * | dtrace_epid_t ---------+--------------> Enabled Probe ID (EPID)
+ * | dtrace_state_t * ------+--------------> State associated with this ECB
+ * | dtrace_predicate_t * --+---------+
+ * | dtrace_action_t * -----+----+    |
+ * | dtrace_ecb_t * ---+    |    |    |       Predicate (if any)
+ * +-------------------+----+    |    |       dtrace_predicate_t
+ *                     |         |    +---> +--------------------+
+ *                     |         |          | dtrace_difo_t * ---+----> DIFO
+ *                     |         |          +--------------------+
+ *                     |         |
+ *            Next ECB |         |           Action
+ *            (if any) |         |       dtrace_action_t
+ *                     :         +--> +-------------------+
+ *                     :              | dtrace_actkind_t -+------> kind
+ *                     v              | dtrace_difo_t * --+------> DIFO (if any)
+ *                                    | dtrace_recdesc_t -+------> record descr.
+ *                                    | dtrace_action_t * +------+
+ *                                    +-------------------+      |
+ *                                                               | Next action
+ *                               +-------------------------------+  (if any)
+ *                               |
+ *                               |           Action
+ *                               |       dtrace_action_t
+ *                               +--> +-------------------+
+ *                                    | dtrace_actkind_t -+------> kind
+ *                                    | dtrace_difo_t * --+------> DIFO (if any)
+ *                                    | dtrace_action_t * +------+
+ *                                    +-------------------+      |
+ *                                                               | Next action
+ *                               +-------------------------------+  (if any)
+ *                               |
+ *                               :
+ *                               v
+ *
+ *
+ * dtrace_probe() iterates over the ECB list.  If the ECB needs less space
+ * than is available in the principal buffer, the ECB is processed:  if the
+ * predicate is non-NULL, the DIF object is executed.  If the result is
+ * non-zero, the action list is processed, with each action being executed
+ * accordingly.  When the action list has been completely executed, processing
+ * advances to the next ECB.  processing advances to the next ECB.  If the
+ * result is non-zero; For each ECB, it first determines the The ECB
+ * abstraction allows disjoint consumers to multiplex on single probes.
+ */
+struct dtrace_ecb {
+	dtrace_epid_t dte_epid;			/* enabled probe ID */
+	uint32_t dte_alignment;			/* required alignment */
+	size_t dte_needed;			/* bytes needed */
+	size_t dte_size;			/* total size of payload */
+	dtrace_predicate_t *dte_predicate;	/* predicate, if any */
+	dtrace_action_t *dte_action;		/* actions, if any */
+	dtrace_ecb_t *dte_next;			/* next ECB on probe */
+	dtrace_state_t *dte_state;		/* pointer to state */
+	uint32_t dte_cond;			/* security condition */
+	dtrace_probe_t *dte_probe;		/* pointer to probe */
+	dtrace_action_t *dte_action_last;	/* last action on ECB */
+	uint64_t dte_uarg;			/* library argument */
+};
+
+struct dtrace_predicate {
+	dtrace_difo_t *dtp_difo;		/* DIF object */
+	dtrace_cacheid_t dtp_cacheid;		/* cache identifier */
+	int dtp_refcnt;				/* reference count */
+};
+
+struct dtrace_action {
+	dtrace_actkind_t dta_kind;		/* kind of action */
+	uint16_t dta_intuple;			/* boolean:  in aggregation */
+	uint32_t dta_refcnt;			/* reference count */
+	dtrace_difo_t *dta_difo;		/* pointer to DIFO */
+	dtrace_recdesc_t dta_rec;		/* record description */
+	dtrace_action_t *dta_prev;		/* previous action */
+	dtrace_action_t *dta_next;		/* next action */
+};
+
+typedef struct dtrace_aggregation {
+	dtrace_action_t dtag_action;		/* action; must be first */
+	dtrace_aggid_t dtag_id;			/* identifier */
+	dtrace_ecb_t *dtag_ecb;			/* corresponding ECB */
+	dtrace_action_t *dtag_first;		/* first action in tuple */
+	uint32_t dtag_base;			/* base of aggregation */
+	uint8_t dtag_hasarg;			/* boolean:  has argument */
+	uint64_t dtag_initial;			/* initial value */
+	void (*dtag_aggregate)(uint64_t *, uint64_t, uint64_t);
+} dtrace_aggregation_t;
+
+/*
+ * DTrace Buffers
+ *
+ * Principal buffers, aggregation buffers, and speculative buffers are all
+ * managed with the dtrace_buffer structure.  By default, this structure
+ * includes twin data buffers -- dtb_tomax and dtb_xamot -- that serve as the
+ * active and passive buffers, respectively.  For speculative buffers,
+ * dtb_xamot will be NULL; for "ring" and "fill" buffers, dtb_xamot will point
+ * to a scratch buffer.  For all buffer types, the dtrace_buffer structure is
+ * always allocated on a per-CPU basis; a single dtrace_buffer structure is
+ * never shared among CPUs.  (That is, there is never true sharing of the
+ * dtrace_buffer structure; to prevent false sharing of the structure, it must
+ * always be aligned to the coherence granularity -- generally 64 bytes.)
+ *
+ * One of the critical design decisions of DTrace is that a given ECB always
+ * stores the same quantity and type of data.  This is done to assure that the
+ * only metadata required for an ECB's traced data is the EPID.  That is, from
+ * the EPID, the consumer can determine the data layout.  (The data buffer
+ * layout is shown schematically below.)  By assuring that one can determine
+ * data layout from the EPID, the metadata stream can be separated from the
+ * data stream -- simplifying the data stream enormously.
+ *
+ *      base of data buffer --->  +------+--------------------+------+
+ *                                | EPID | data               | EPID |
+ *                                +------+--------+------+----+------+
+ *                                | data          | EPID | data      |
+ *                                +---------------+------+-----------+
+ *                                | data, cont.                      |
+ *                                +------+--------------------+------+
+ *                                | EPID | data               |      |
+ *                                +------+--------------------+      |
+ *                                |                ||                |
+ *                                |                ||                |
+ *                                |                \/                |
+ *                                :                                  :
+ *                                .                                  .
+ *                                .                                  .
+ *                                .                                  .
+ *                                :                                  :
+ *                                |                                  |
+ *     limit of data buffer --->  +----------------------------------+
+ *
+ * When evaluating an ECB, dtrace_probe() determines if the ECB's needs of the
+ * principal buffer (both scratch and payload) exceed the available space.  If
+ * the ECB's needs exceed available space (and if the principal buffer policy
+ * is the default "switch" policy), the ECB is dropped, the buffer's drop count
+ * is incremented, and processing advances to the next ECB.  If the ECB's needs
+ * can be met with the available space, the ECB is processed, but the offset in
+ * the principal buffer is only advanced if the ECB completes processing
+ * without error.
+ *
+ * When a buffer is to be switched (either because the buffer is the principal
+ * buffer with a "switch" policy or because it is an aggregation buffer), a
+ * cross call is issued to the CPU associated with the buffer.  In the cross
+ * call context, interrupts are disabled, and the active and the inactive
+ * buffers are atomically switched.  This involves switching the data pointers,
+ * copying the various state fields (offset, drops, errors, etc.) into their
+ * inactive equivalents, and clearing the state fields.  Because interrupts are
+ * disabled during this procedure, the switch is guaranteed to appear atomic to
+ * dtrace_probe().
+ *
+ * DTrace Ring Buffering
+ *
+ * To process a ring buffer correctly, one must know the oldest valid record.
+ * Processing starts at the oldest record in the buffer and continues until
+ * the end of the buffer is reached.  Processing then resumes starting with
+ * the record stored at offset 0 in the buffer, and continues until the
+ * youngest record is processed.  If trace records are of a fixed-length,
+ * determining the oldest record is trivial:
+ *
+ *   - If the ring buffer has not wrapped, the oldest record is the record
+ *     stored at offset 0.
+ *
+ *   - If the ring buffer has wrapped, the oldest record is the record stored
+ *     at the current offset.
+ *
+ * With variable length records, however, just knowing the current offset
+ * doesn't suffice for determining the oldest valid record:  assuming that one
+ * allows for arbitrary data, one has no way of searching forward from the
+ * current offset to find the oldest valid record.  (That is, one has no way
+ * of separating data from metadata.) It would be possible to simply refuse to
+ * process any data in the ring buffer between the current offset and the
+ * limit, but this leaves (potentially) an enormous amount of otherwise valid
+ * data unprocessed.
+ *
+ * To effect ring buffering, we track two offsets in the buffer:  the current
+ * offset and the _wrapped_ offset.  If a request is made to reserve some
+ * amount of data, and the buffer has wrapped, the wrapped offset is
+ * incremented until the wrapped offset minus the current offset is greater
+ * than or equal to the reserve request.  This is done by repeatedly looking
+ * up the ECB corresponding to the EPID at the current wrapped offset, and
+ * incrementing the wrapped offset by the size of the data payload
+ * corresponding to that ECB.  If this offset is greater than or equal to the
+ * limit of the data buffer, the wrapped offset is set to 0.  Thus, the
+ * current offset effectively "chases" the wrapped offset around the buffer.
+ * Schematically:
+ *
+ *      base of data buffer --->  +------+--------------------+------+
+ *                                | EPID | data               | EPID |
+ *                                +------+--------+------+----+------+
+ *                                | data          | EPID | data      |
+ *                                +---------------+------+-----------+
+ *                                | data, cont.                      |
+ *                                +------+---------------------------+
+ *                                | EPID | data                      |
+ *           current offset --->  +------+---------------------------+
+ *                                | invalid data                     |
+ *           wrapped offset --->  +------+--------------------+------+
+ *                                | EPID | data               | EPID |
+ *                                +------+--------+------+----+------+
+ *                                | data          | EPID | data      |
+ *                                +---------------+------+-----------+
+ *                                :                                  :
+ *                                .                                  .
+ *                                .        ... valid data ...        .
+ *                                .                                  .
+ *                                :                                  :
+ *                                +------+-------------+------+------+
+ *                                | EPID | data        | EPID | data |
+ *                                +------+------------++------+------+
+ *                                | data, cont.       | leftover     |
+ *     limit of data buffer --->  +-------------------+--------------+
+ *
+ * If the amount of requested buffer space exceeds the amount of space
+ * available between the current offset and the end of the buffer:
+ *
+ *  (1)  all words in the data buffer between the current offset and the limit
+ *       of the data buffer (marked "leftover", above) are set to
+ *       DTRACE_EPIDNONE
+ *
+ *  (2)  the wrapped offset is set to zero
+ *
+ *  (3)  the iteration process described above occurs until the wrapped offset
+ *       is greater than the amount of desired space.
+ *
+ * The wrapped offset is implemented by (re-)using the inactive offset.
+ * In a "switch" buffer policy, the inactive offset stores the offset in
+ * the inactive buffer; in a "ring" buffer policy, it stores the wrapped
+ * offset.
+ *
+ * DTrace Scratch Buffering
+ *
+ * Some ECBs may wish to allocate dynamically-sized temporary scratch memory.
+ * To accommodate such requests easily, scratch memory may be allocated in
+ * the buffer beyond the current offset plus the needed memory of the current
+ * ECB.  If there isn't sufficient room in the buffer for the requested amount
+ * of scratch space, the allocation fails and an error is generated.  Scratch
+ * memory is tracked in the dtrace_mstate_t and is automatically freed when
+ * the ECB ceases processing.  Note that ring buffers cannot allocate their
+ * scratch from the principal buffer -- lest they needlessly overwrite older,
+ * valid data.  Ring buffers therefore have their own dedicated scratch buffer
+ * from which scratch is allocated.
+ */
+#define	DTRACEBUF_RING		0x0001		/* bufpolicy set to "ring" */
+#define	DTRACEBUF_FILL		0x0002		/* bufpolicy set to "fill" */
+#define	DTRACEBUF_NOSWITCH	0x0004		/* do not switch buffer */
+#define	DTRACEBUF_WRAPPED	0x0008		/* ring buffer has wrapped */
+#define	DTRACEBUF_DROPPED	0x0010		/* drops occurred */
+#define	DTRACEBUF_ERROR		0x0020		/* errors occurred */
+#define	DTRACEBUF_FULL		0x0040		/* "fill" buffer is full */
+#define	DTRACEBUF_CONSUMED	0x0080		/* buffer has been consumed */
+#define	DTRACEBUF_INACTIVE	0x0100		/* buffer is not yet active */
+
+typedef struct dtrace_buffer {
+	uint64_t dtb_offset;			/* current offset in buffer */
+	uint64_t dtb_size;			/* size of buffer */
+	uint32_t dtb_flags;			/* flags */
+	uint32_t dtb_drops;			/* number of drops */
+	caddr_t dtb_tomax;			/* active buffer */
+	caddr_t dtb_xamot;			/* inactive buffer */
+	uint32_t dtb_xamot_flags;		/* inactive flags */
+	uint32_t dtb_xamot_drops;		/* drops in inactive buffer */
+	uint64_t dtb_xamot_offset;		/* offset in inactive buffer */
+	uint32_t dtb_errors;			/* number of errors */
+	uint32_t dtb_xamot_errors;		/* errors in inactive buffer */
+#ifndef _LP64
+	uint64_t dtb_pad1;
+#endif
+} dtrace_buffer_t;
+
+/*
+ * DTrace Aggregation Buffers
+ *
+ * Aggregation buffers use much of the same mechanism as described above
+ * ("DTrace Buffers").  However, because an aggregation is fundamentally a
+ * hash, there exists dynamic metadata associated with an aggregation buffer
+ * that is not associated with other kinds of buffers.  This aggregation
+ * metadata is _only_ relevant for the in-kernel implementation of
+ * aggregations; it is not actually relevant to user-level consumers.  To do
+ * this, we allocate dynamic aggregation data (hash keys and hash buckets)
+ * starting below the _limit_ of the buffer, and we allocate data from the
+ * _base_ of the buffer.  When the aggregation buffer is copied out, _only_ the
+ * data is copied out; the metadata is simply discarded.  Schematically,
+ * aggregation buffers look like:
+ *
+ *      base of data buffer --->  +-------+------+-----------+-------+
+ *                                | aggid | key  | value     | aggid |
+ *                                +-------+------+-----------+-------+
+ *                                | key                              |
+ *                                +-------+-------+-----+------------+
+ *                                | value | aggid | key | value      |
+ *                                +-------+------++-----+------+-----+
+ *                                | aggid | key  | value       |     |
+ *                                +-------+------+-------------+     |
+ *                                |                ||                |
+ *                                |                ||                |
+ *                                |                \/                |
+ *                                :                                  :
+ *                                .                                  .
+ *                                .                                  .
+ *                                .                                  .
+ *                                :                                  :
+ *                                |                /\                |
+ *                                |                ||   +------------+
+ *                                |                ||   |            |
+ *                                +---------------------+            |
+ *                                | hash keys                        |
+ *                                | (dtrace_aggkey structures)       |
+ *                                |                                  |
+ *                                +----------------------------------+
+ *                                | hash buckets                     |
+ *                                | (dtrace_aggbuffer structure)     |
+ *                                |                                  |
+ *     limit of data buffer --->  +----------------------------------+
+ *
+ *
+ * As implied above, just as we assure that ECBs always store a constant
+ * amount of data, we assure that a given aggregation -- identified by its
+ * aggregation ID -- always stores data of a constant quantity and type.
+ * As with EPIDs, this allows the aggregation ID to serve as the metadata for a
+ * given record.
+ *
+ * Note that the size of the dtrace_aggkey structure must be sizeof (uintptr_t)
+ * aligned.  (If this the structure changes such that this becomes false, an
+ * assertion will fail in dtrace_aggregate().)
+ */
+typedef struct dtrace_aggkey {
+	uint32_t dtak_hashval;			/* hash value */
+	uint32_t dtak_action:4;			/* action -- 4 bits */
+	uint32_t dtak_size:28;			/* size -- 28 bits */
+	caddr_t dtak_data;			/* data pointer */
+	struct dtrace_aggkey *dtak_next;	/* next in hash chain */
+} dtrace_aggkey_t;
+
+typedef struct dtrace_aggbuffer {
+	uintptr_t dtagb_hashsize;		/* number of buckets */
+	uintptr_t dtagb_free;			/* free list of keys */
+	dtrace_aggkey_t **dtagb_hash;		/* hash table */
+} dtrace_aggbuffer_t;
+
+/*
+ * DTrace Speculations
+ *
+ * Speculations have a per-CPU buffer and a global state.  Once a speculation
+ * buffer has been comitted or discarded, it cannot be reused until all CPUs
+ * have taken the same action (commit or discard) on their respective
+ * speculative buffer.  However, because DTrace probes may execute in arbitrary
+ * context, other CPUs cannot simply be cross-called at probe firing time to
+ * perform the necessary commit or discard.  The speculation states thus
+ * optimize for the case that a speculative buffer is only active on one CPU at
+ * the time of a commit() or discard() -- for if this is the case, other CPUs
+ * need not take action, and the speculation is immediately available for
+ * reuse.  If the speculation is active on multiple CPUs, it must be
+ * asynchronously cleaned -- potentially leading to a higher rate of dirty
+ * speculative drops.  The speculation states are as follows:
+ *
+ *  DTRACESPEC_INACTIVE       <= Initial state; inactive speculation
+ *  DTRACESPEC_ACTIVE         <= Allocated, but not yet speculatively traced to
+ *  DTRACESPEC_ACTIVEONE      <= Speculatively traced to on one CPU
+ *  DTRACESPEC_ACTIVEMANY     <= Speculatively traced to on more than one CPU
+ *  DTRACESPEC_COMMITTING     <= Currently being commited on one CPU
+ *  DTRACESPEC_COMMITTINGMANY <= Currently being commited on many CPUs
+ *  DTRACESPEC_DISCARDING     <= Currently being discarded on many CPUs
+ *
+ * The state transition diagram is as follows:
+ *
+ *     +----------------------------------------------------------+
+ *     |                                                          |
+ *     |                      +------------+                      |
+ *     |  +-------------------| COMMITTING |<-----------------+   |
+ *     |  |                   +------------+                  |   |
+ *     |  | copied spec.            ^             commit() on |   | discard() on
+ *     |  | into principal          |              active CPU |   | active CPU
+ *     |  |                         | commit()                |   |
+ *     V  V                         |                         |   |
+ * +----------+                 +--------+                +-----------+
+ * | INACTIVE |---------------->| ACTIVE |--------------->| ACTIVEONE |
+ * +----------+  speculation()  +--------+  speculate()   +-----------+
+ *     ^  ^                         |                         |   |
+ *     |  |                         | discard()               |   |
+ *     |  | asynchronously          |            discard() on |   | speculate()
+ *     |  | cleaned                 V            inactive CPU |   | on inactive
+ *     |  |                   +------------+                  |   | CPU
+ *     |  +-------------------| DISCARDING |<-----------------+   |
+ *     |                      +------------+                      |
+ *     | asynchronously             ^                             |
+ *     | copied spec.               |       discard()             |
+ *     | into principal             +------------------------+    |
+ *     |                                                     |    V
+ *  +----------------+             commit()              +------------+
+ *  | COMMITTINGMANY |<----------------------------------| ACTIVEMANY |
+ *  +----------------+                                   +------------+
+ */
+typedef enum dtrace_speculation_state {
+	DTRACESPEC_INACTIVE = 0,
+	DTRACESPEC_ACTIVE,
+	DTRACESPEC_ACTIVEONE,
+	DTRACESPEC_ACTIVEMANY,
+	DTRACESPEC_COMMITTING,
+	DTRACESPEC_COMMITTINGMANY,
+	DTRACESPEC_DISCARDING
+} dtrace_speculation_state_t;
+
+typedef struct dtrace_speculation {
+	dtrace_speculation_state_t dtsp_state;	/* current speculation state */
+	int dtsp_cleaning;			/* non-zero if being cleaned */
+	dtrace_buffer_t *dtsp_buffer;		/* speculative buffer */
+} dtrace_speculation_t;
+
+/*
+ * DTrace Dynamic Variables
+ *
+ * The dynamic variable problem is obviously decomposed into two subproblems:
+ * allocating new dynamic storage, and freeing old dynamic storage.  The
+ * presence of the second problem makes the first much more complicated -- or
+ * rather, the absence of the second renders the first trivial.  This is the
+ * case with aggregations, for which there is effectively no deallocation of
+ * dynamic storage.  (Or more accurately, all dynamic storage is deallocated
+ * when a snapshot is taken of the aggregation.)  As DTrace dynamic variables
+ * allow for both dynamic allocation and dynamic deallocation, the
+ * implementation of dynamic variables is quite a bit more complicated than
+ * that of their aggregation kin.
+ *
+ * We observe that allocating new dynamic storage is tricky only because the
+ * size can vary -- the allocation problem is much easier if allocation sizes
+ * are uniform.  We further observe that in D, the size of dynamic variables is
+ * actually _not_ dynamic -- dynamic variable sizes may be determined by static
+ * analysis of DIF text.  (This is true even of putatively dynamically-sized
+ * objects like strings and stacks, the sizes of which are dictated by the
+ * "stringsize" and "stackframes" variables, respectively.)  We exploit this by
+ * performing this analysis on all DIF before enabling any probes.  For each
+ * dynamic load or store, we calculate the dynamically-allocated size plus the
+ * size of the dtrace_dynvar structure plus the storage required to key the
+ * data.  For all DIF, we take the largest value and dub it the _chunksize_.
+ * We then divide dynamic memory into two parts:  a hash table that is wide
+ * enough to have every chunk in its own bucket, and a larger region of equal
+ * chunksize units.  Whenever we wish to dynamically allocate a variable, we
+ * always allocate a single chunk of memory.  Depending on the uniformity of
+ * allocation, this will waste some amount of memory -- but it eliminates the
+ * non-determinism inherent in traditional heap fragmentation.
+ *
+ * Dynamic objects are allocated by storing a non-zero value to them; they are
+ * deallocated by storing a zero value to them.  Dynamic variables are
+ * complicated enormously by being shared between CPUs.  In particular,
+ * consider the following scenario:
+ *
+ *                 CPU A                                 CPU B
+ *  +---------------------------------+   +---------------------------------+
+ *  |                                 |   |                                 |
+ *  | allocates dynamic object a[123] |   |                                 |
+ *  | by storing the value 345 to it  |   |                                 |
+ *  |                               --------->                              |
+ *  |                                 |   | wishing to load from object     |
+ *  |                                 |   | a[123], performs lookup in      |
+ *  |                                 |   | dynamic variable space          |
+ *  |                               <---------                              |
+ *  | deallocates object a[123] by    |   |                                 |
+ *  | storing 0 to it                 |   |                                 |
+ *  |                                 |   |                                 |
+ *  | allocates dynamic object b[567] |   | performs load from a[123]       |
+ *  | by storing the value 789 to it  |   |                                 |
+ *  :                                 :   :                                 :
+ *  .                                 .   .                                 .
+ *
+ * This is obviously a race in the D program, but there are nonetheless only
+ * two valid values for CPU B's load from a[123]:  345 or 0.  Most importantly,
+ * CPU B may _not_ see the value 789 for a[123].
+ *
+ * There are essentially two ways to deal with this:
+ *
+ *  (1)  Explicitly spin-lock variables.  That is, if CPU B wishes to load
+ *       from a[123], it needs to lock a[123] and hold the lock for the
+ *       duration that it wishes to manipulate it.
+ *
+ *  (2)  Avoid reusing freed chunks until it is known that no CPU is referring
+ *       to them.
+ *
+ * The implementation of (1) is rife with complexity, because it requires the
+ * user of a dynamic variable to explicitly decree when they are done using it.
+ * Were all variables by value, this perhaps wouldn't be debilitating -- but
+ * dynamic variables of non-scalar types are tracked by reference.  That is, if
+ * a dynamic variable is, say, a string, and that variable is to be traced to,
+ * say, the principal buffer, the DIF emulation code returns to the main
+ * dtrace_probe() loop a pointer to the underlying storage, not the contents of
+ * the storage.  Further, code calling on DIF emulation would have to be aware
+ * that the DIF emulation has returned a reference to a dynamic variable that
+ * has been potentially locked.  The variable would have to be unlocked after
+ * the main dtrace_probe() loop is finished with the variable, and the main
+ * dtrace_probe() loop would have to be careful to not call any further DIF
+ * emulation while the variable is locked to avoid deadlock.  More generally,
+ * if one were to implement (1), DIF emulation code dealing with dynamic
+ * variables could only deal with one dynamic variable at a time (lest deadlock
+ * result).  To sum, (1) exports too much subtlety to the users of dynamic
+ * variables -- increasing maintenance burden and imposing serious constraints
+ * on future DTrace development.
+ *
+ * The implementation of (2) is also complex, but the complexity is more
+ * manageable.  We need to be sure that when a variable is deallocated, it is
+ * not placed on a traditional free list, but rather on a _dirty_ list.  Once a
+ * variable is on a dirty list, it cannot be found by CPUs performing a
+ * subsequent lookup of the variable -- but it may still be in use by other
+ * CPUs.  To assure that all CPUs that may be seeing the old variable have
+ * cleared out of probe context, a dtrace_sync() can be issued.  Once the
+ * dtrace_sync() has completed, it can be known that all CPUs are done
+ * manipulating the dynamic variable -- the dirty list can be atomically
+ * appended to the free list.  Unfortunately, there's a slight hiccup in this
+ * mechanism:  dtrace_sync() may not be issued from probe context.  The
+ * dtrace_sync() must be therefore issued asynchronously from non-probe
+ * context.  For this we rely on the DTrace cleaner, a cyclic that runs at the
+ * "cleanrate" frequency.  To ease this implementation, we define several chunk
+ * lists:
+ *
+ *   - Dirty.  Deallocated chunks, not yet cleaned.  Not available.
+ *
+ *   - Rinsing.  Formerly dirty chunks that are currently being asynchronously
+ *     cleaned.  Not available, but will be shortly.  Dynamic variable
+ *     allocation may not spin or block for availability, however.
+ *
+ *   - Clean.  Clean chunks, ready for allocation -- but not on the free list.
+ *
+ *   - Free.  Available for allocation.
+ *
+ * Moreover, to avoid absurd contention, _each_ of these lists is implemented
+ * on a per-CPU basis.  This is only for performance, not correctness; chunks
+ * may be allocated from another CPU's free list.  The algorithm for allocation
+ * then is this:
+ *
+ *   (1)  Attempt to atomically allocate from current CPU's free list.  If list
+ *        is non-empty and allocation is successful, allocation is complete.
+ *
+ *   (2)  If the clean list is non-empty, atomically move it to the free list,
+ *        and reattempt (1).
+ *
+ *   (3)  If the dynamic variable space is in the CLEAN state, look for free
+ *        and clean lists on other CPUs by setting the current CPU to the next
+ *        CPU, and reattempting (1).  If the next CPU is the current CPU (that
+ *        is, if all CPUs have been checked), atomically switch the state of
+ *        the dynamic variable space based on the following:
+ *
+ *        - If no free chunks were found and no dirty chunks were found,
+ *          atomically set the state to EMPTY.
+ *
+ *        - If dirty chunks were found, atomically set the state to DIRTY.
+ *
+ *        - If rinsing chunks were found, atomically set the state to RINSING.
+ *
+ *   (4)  Based on state of dynamic variable space state, increment appropriate
+ *        counter to indicate dynamic drops (if in EMPTY state) vs. dynamic
+ *        dirty drops (if in DIRTY state) vs. dynamic rinsing drops (if in
+ *        RINSING state).  Fail the allocation.
+ *
+ * The cleaning cyclic operates with the following algorithm:  for all CPUs
+ * with a non-empty dirty list, atomically move the dirty list to the rinsing
+ * list.  Perform a dtrace_sync().  For all CPUs with a non-empty rinsing list,
+ * atomically move the rinsing list to the clean list.  Perform another
+ * dtrace_sync().  By this point, all CPUs have seen the new clean list; the
+ * state of the dynamic variable space can be restored to CLEAN.
+ *
+ * There exist two final races that merit explanation.  The first is a simple
+ * allocation race:
+ *
+ *                 CPU A                                 CPU B
+ *  +---------------------------------+   +---------------------------------+
+ *  |                                 |   |                                 |
+ *  | allocates dynamic object a[123] |   | allocates dynamic object a[123] |
+ *  | by storing the value 345 to it  |   | by storing the value 567 to it  |
+ *  |                                 |   |                                 |
+ *  :                                 :   :                                 :
+ *  .                                 .   .                                 .
+ *
+ * Again, this is a race in the D program.  It can be resolved by having a[123]
+ * hold the value 345 or a[123] hold the value 567 -- but it must be true that
+ * a[123] have only _one_ of these values.  (That is, the racing CPUs may not
+ * put the same element twice on the same hash chain.)  This is resolved
+ * simply:  before the allocation is undertaken, the start of the new chunk's
+ * hash chain is noted.  Later, after the allocation is complete, the hash
+ * chain is atomically switched to point to the new element.  If this fails
+ * (because of either concurrent allocations or an allocation concurrent with a
+ * deletion), the newly allocated chunk is deallocated to the dirty list, and
+ * the whole process of looking up (and potentially allocating) the dynamic
+ * variable is reattempted.
+ *
+ * The final race is a simple deallocation race:
+ *
+ *                 CPU A                                 CPU B
+ *  +---------------------------------+   +---------------------------------+
+ *  |                                 |   |                                 |
+ *  | deallocates dynamic object      |   | deallocates dynamic object      |
+ *  | a[123] by storing the value 0   |   | a[123] by storing the value 0   |
+ *  | to it                           |   | to it                           |
+ *  |                                 |   |                                 |
+ *  :                                 :   :                                 :
+ *  .                                 .   .                                 .
+ *
+ * Once again, this is a race in the D program, but it is one that we must
+ * handle without corrupting the underlying data structures.  Because
+ * deallocations require the deletion of a chunk from the middle of a hash
+ * chain, we cannot use a single-word atomic operation to remove it.  For this,
+ * we add a spin lock to the hash buckets that is _only_ used for deallocations
+ * (allocation races are handled as above).  Further, this spin lock is _only_
+ * held for the duration of the delete; before control is returned to the DIF
+ * emulation code, the hash bucket is unlocked.
+ */
+typedef struct dtrace_key {
+	uint64_t dttk_value;			/* data value or data pointer */
+	uint64_t dttk_size;			/* 0 if by-val, >0 if by-ref */
+} dtrace_key_t;
+
+typedef struct dtrace_tuple {
+	uint32_t dtt_nkeys;			/* number of keys in tuple */
+	uint32_t dtt_pad;			/* padding */
+	dtrace_key_t dtt_key[1];		/* array of tuple keys */
+} dtrace_tuple_t;
+
+typedef struct dtrace_dynvar {
+	uint64_t dtdv_hashval;			/* hash value -- 0 if free */
+	struct dtrace_dynvar *dtdv_next;	/* next on list or hash chain */
+	void *dtdv_data;			/* pointer to data */
+	dtrace_tuple_t dtdv_tuple;		/* tuple key */
+} dtrace_dynvar_t;
+
+typedef enum dtrace_dynvar_op {
+	DTRACE_DYNVAR_ALLOC,
+	DTRACE_DYNVAR_NOALLOC,
+	DTRACE_DYNVAR_DEALLOC
+} dtrace_dynvar_op_t;
+
+typedef struct dtrace_dynhash {
+	dtrace_dynvar_t *dtdh_chain;		/* hash chain for this bucket */
+	uintptr_t dtdh_lock;			/* deallocation lock */
+#ifdef _LP64
+	uintptr_t dtdh_pad[6];			/* pad to avoid false sharing */
+#else
+	uintptr_t dtdh_pad[14];			/* pad to avoid false sharing */
+#endif
+} dtrace_dynhash_t;
+
+typedef struct dtrace_dstate_percpu {
+	dtrace_dynvar_t *dtdsc_free;		/* free list for this CPU */
+	dtrace_dynvar_t *dtdsc_dirty;		/* dirty list for this CPU */
+	dtrace_dynvar_t *dtdsc_rinsing;		/* rinsing list for this CPU */
+	dtrace_dynvar_t *dtdsc_clean;		/* clean list for this CPU */
+	uint64_t dtdsc_drops;			/* number of capacity drops */
+	uint64_t dtdsc_dirty_drops;		/* number of dirty drops */
+	uint64_t dtdsc_rinsing_drops;		/* number of rinsing drops */
+#ifdef _LP64
+	uint64_t dtdsc_pad;			/* pad to avoid false sharing */
+#else
+	uint64_t dtdsc_pad[2];			/* pad to avoid false sharing */
+#endif
+} dtrace_dstate_percpu_t;
+
+typedef enum dtrace_dstate_state {
+	DTRACE_DSTATE_CLEAN = 0,
+	DTRACE_DSTATE_EMPTY,
+	DTRACE_DSTATE_DIRTY,
+	DTRACE_DSTATE_RINSING
+} dtrace_dstate_state_t;
+
+typedef struct dtrace_dstate {
+	void *dtds_base;			/* base of dynamic var. space */
+	size_t dtds_size;			/* size of dynamic var. space */
+	size_t dtds_hashsize;			/* number of buckets in hash */
+	size_t dtds_chunksize;			/* size of each chunk */
+	dtrace_dynhash_t *dtds_hash;		/* pointer to hash table */
+	dtrace_dstate_state_t dtds_state;	/* current dynamic var. state */
+	dtrace_dstate_percpu_t *dtds_percpu;	/* per-CPU dyn. var. state */
+} dtrace_dstate_t;
+
+/*
+ * DTrace Variable State
+ *
+ * The DTrace variable state tracks user-defined variables in its dtrace_vstate
+ * structure.  Each DTrace consumer has exactly one dtrace_vstate structure,
+ * but some dtrace_vstate structures may exist without a corresponding DTrace
+ * consumer (see "DTrace Helpers", below).  As described in <sys/dtrace.h>,
+ * user-defined variables can have one of three scopes:
+ *
+ *  DIFV_SCOPE_GLOBAL  =>  global scope
+ *  DIFV_SCOPE_THREAD  =>  thread-local scope (i.e. "self->" variables)
+ *  DIFV_SCOPE_LOCAL   =>  clause-local scope (i.e. "this->" variables)
+ *
+ * The variable state tracks variables by both their scope and their allocation
+ * type:
+ *
+ *  - The dtvs_globals and dtvs_locals members each point to an array of
+ *    dtrace_statvar structures.  These structures contain both the variable
+ *    metadata (dtrace_difv structures) and the underlying storage for all
+ *    statically allocated variables, including statically allocated
+ *    DIFV_SCOPE_GLOBAL variables and all DIFV_SCOPE_LOCAL variables.
+ *
+ *  - The dtvs_tlocals member points to an array of dtrace_difv structures for
+ *    DIFV_SCOPE_THREAD variables.  As such, this array tracks _only_ the
+ *    variable metadata for DIFV_SCOPE_THREAD variables; the underlying storage
+ *    is allocated out of the dynamic variable space.
+ *
+ *  - The dtvs_dynvars member is the dynamic variable state associated with the
+ *    variable state.  The dynamic variable state (described in "DTrace Dynamic
+ *    Variables", above) tracks all DIFV_SCOPE_THREAD variables and all
+ *    dynamically-allocated DIFV_SCOPE_GLOBAL variables.
+ */
+typedef struct dtrace_statvar {
+	uint64_t dtsv_data;			/* data or pointer to it */
+	size_t dtsv_size;			/* size of pointed-to data */
+	int dtsv_refcnt;			/* reference count */
+	dtrace_difv_t dtsv_var;			/* variable metadata */
+} dtrace_statvar_t;
+
+typedef struct dtrace_vstate {
+	dtrace_state_t *dtvs_state;		/* back pointer to state */
+	dtrace_statvar_t **dtvs_globals;	/* statically-allocated glbls */
+	int dtvs_nglobals;			/* number of globals */
+	dtrace_difv_t *dtvs_tlocals;		/* thread-local metadata */
+	int dtvs_ntlocals;			/* number of thread-locals */
+	dtrace_statvar_t **dtvs_locals;		/* clause-local data */
+	int dtvs_nlocals;			/* number of clause-locals */
+	dtrace_dstate_t dtvs_dynvars;		/* dynamic variable state */
+} dtrace_vstate_t;
+
+/*
+ * DTrace Machine State
+ *
+ * In the process of processing a fired probe, DTrace needs to track and/or
+ * cache some per-CPU state associated with that particular firing.  This is
+ * state that is always discarded after the probe firing has completed, and
+ * much of it is not specific to any DTrace consumer, remaining valid across
+ * all ECBs.  This state is tracked in the dtrace_mstate structure.
+ */
+#define	DTRACE_MSTATE_ARGS		0x00000001
+#define	DTRACE_MSTATE_PROBE		0x00000002
+#define	DTRACE_MSTATE_EPID		0x00000004
+#define	DTRACE_MSTATE_TIMESTAMP		0x00000008
+#define	DTRACE_MSTATE_STACKDEPTH	0x00000010
+#define	DTRACE_MSTATE_CALLER		0x00000020
+#define	DTRACE_MSTATE_IPL		0x00000040
+#define	DTRACE_MSTATE_FLTOFFS		0x00000080
+#define	DTRACE_MSTATE_WALLTIMESTAMP	0x00000100
+#define	DTRACE_MSTATE_USTACKDEPTH	0x00000200
+#define	DTRACE_MSTATE_UCALLER		0x00000400
+
+typedef struct dtrace_mstate {
+	uintptr_t dtms_scratch_base;		/* base of scratch space */
+	uintptr_t dtms_scratch_ptr;		/* current scratch pointer */
+	size_t dtms_scratch_size;		/* scratch size */
+	uint32_t dtms_present;			/* variables that are present */
+	uint64_t dtms_arg[5];			/* cached arguments */
+	dtrace_epid_t dtms_epid;		/* current EPID */
+	uint64_t dtms_timestamp;		/* cached timestamp */
+	hrtime_t dtms_walltimestamp;		/* cached wall timestamp */
+	int dtms_stackdepth;			/* cached stackdepth */
+	int dtms_ustackdepth;			/* cached ustackdepth */
+	struct dtrace_probe *dtms_probe;	/* current probe */
+	uintptr_t dtms_caller;			/* cached caller */
+	uint64_t dtms_ucaller;			/* cached user-level caller */
+	int dtms_ipl;				/* cached interrupt pri lev */
+	int dtms_fltoffs;			/* faulting DIFO offset */
+	uintptr_t dtms_strtok;			/* saved strtok() pointer */
+	uint32_t dtms_access;			/* memory access rights */
+	dtrace_difo_t *dtms_difo;		/* current dif object */
+} dtrace_mstate_t;
+
+#define	DTRACE_COND_OWNER	0x1
+#define	DTRACE_COND_USERMODE	0x2
+#define	DTRACE_COND_ZONEOWNER	0x4
+
+#define	DTRACE_PROBEKEY_MAXDEPTH	8	/* max glob recursion depth */
+
+/*
+ * Access flag used by dtrace_mstate.dtms_access.
+ */
+#define	DTRACE_ACCESS_KERNEL	0x1		/* the priv to read kmem */
+
+
+/*
+ * DTrace Activity
+ *
+ * Each DTrace consumer is in one of several states, which (for purposes of
+ * avoiding yet-another overloading of the noun "state") we call the current
+ * _activity_.  The activity transitions on dtrace_go() (from DTRACIOCGO), on
+ * dtrace_stop() (from DTRACIOCSTOP) and on the exit() action.  Activities may
+ * only transition in one direction; the activity transition diagram is a
+ * directed acyclic graph.  The activity transition diagram is as follows:
+ *
+ *
+ * +----------+                   +--------+                   +--------+
+ * | INACTIVE |------------------>| WARMUP |------------------>| ACTIVE |
+ * +----------+   dtrace_go(),    +--------+   dtrace_go(),    +--------+
+ *                before BEGIN        |        after BEGIN       |  |  |
+ *                                    |                          |  |  |
+ *                      exit() action |                          |  |  |
+ *                     from BEGIN ECB |                          |  |  |
+ *                                    |                          |  |  |
+ *                                    v                          |  |  |
+ *                               +----------+     exit() action  |  |  |
+ * +-----------------------------| DRAINING |<-------------------+  |  |
+ * |                             +----------+                       |  |
+ * |                                  |                             |  |
+ * |                   dtrace_stop(), |                             |  |
+ * |                     before END   |                             |  |
+ * |                                  |                             |  |
+ * |                                  v                             |  |
+ * | +---------+                 +----------+                       |  |
+ * | | STOPPED |<----------------| COOLDOWN |<----------------------+  |
+ * | +---------+  dtrace_stop(), +----------+     dtrace_stop(),       |
+ * |                after END                       before END         |
+ * |                                                                   |
+ * |                              +--------+                           |
+ * +----------------------------->| KILLED |<--------------------------+
+ *       deadman timeout or       +--------+     deadman timeout or
+ *        killed consumer                         killed consumer
+ *
+ * Note that once a DTrace consumer has stopped tracing, there is no way to
+ * restart it; if a DTrace consumer wishes to restart tracing, it must reopen
+ * the DTrace pseudodevice.
+ */
+typedef enum dtrace_activity {
+	DTRACE_ACTIVITY_INACTIVE = 0,		/* not yet running */
+	DTRACE_ACTIVITY_WARMUP,			/* while starting */
+	DTRACE_ACTIVITY_ACTIVE,			/* running */
+	DTRACE_ACTIVITY_DRAINING,		/* before stopping */
+	DTRACE_ACTIVITY_COOLDOWN,		/* while stopping */
+	DTRACE_ACTIVITY_STOPPED,		/* after stopping */
+	DTRACE_ACTIVITY_KILLED			/* killed */
+} dtrace_activity_t;
+
+/*
+ * DTrace Helper Implementation
+ *
+ * A description of the helper architecture may be found in <sys/dtrace.h>.
+ * Each process contains a pointer to its helpers in its p_dtrace_helpers
+ * member.  This is a pointer to a dtrace_helpers structure, which contains an
+ * array of pointers to dtrace_helper structures, helper variable state (shared
+ * among a process's helpers) and a generation count.  (The generation count is
+ * used to provide an identifier when a helper is added so that it may be
+ * subsequently removed.)  The dtrace_helper structure is self-explanatory,
+ * containing pointers to the objects needed to execute the helper.  Note that
+ * helpers are _duplicated_ across fork(2), and destroyed on exec(2).  No more
+ * than dtrace_helpers_max are allowed per-process.
+ */
+#define	DTRACE_HELPER_ACTION_USTACK	0
+#define	DTRACE_NHELPER_ACTIONS		1
+
+typedef struct dtrace_helper_action {
+	int dtha_generation;			/* helper action generation */
+	int dtha_nactions;			/* number of actions */
+	dtrace_difo_t *dtha_predicate;		/* helper action predicate */
+	dtrace_difo_t **dtha_actions;		/* array of actions */
+	struct dtrace_helper_action *dtha_next;	/* next helper action */
+} dtrace_helper_action_t;
+
+typedef struct dtrace_helper_provider {
+	int dthp_generation;			/* helper provider generation */
+	uint32_t dthp_ref;			/* reference count */
+	dof_helper_t dthp_prov;			/* DOF w/ provider and probes */
+} dtrace_helper_provider_t;
+
+typedef struct dtrace_helpers {
+	dtrace_helper_action_t **dthps_actions;	/* array of helper actions */
+	dtrace_vstate_t dthps_vstate;		/* helper action var. state */
+	dtrace_helper_provider_t **dthps_provs;	/* array of providers */
+	uint_t dthps_nprovs;			/* count of providers */
+	uint_t dthps_maxprovs;			/* provider array size */
+	int dthps_generation;			/* current generation */
+	pid_t dthps_pid;			/* pid of associated proc */
+	int dthps_deferred;			/* helper in deferred list */
+	struct dtrace_helpers *dthps_next;	/* next pointer */
+	struct dtrace_helpers *dthps_prev;	/* prev pointer */
+} dtrace_helpers_t;
+
+/*
+ * DTrace Helper Action Tracing
+ *
+ * Debugging helper actions can be arduous.  To ease the development and
+ * debugging of helpers, DTrace contains a tracing-framework-within-a-tracing-
+ * framework: helper tracing.  If dtrace_helptrace_enabled is non-zero (which
+ * it is by default on DEBUG kernels), all helper activity will be traced to a
+ * global, in-kernel ring buffer.  Each entry includes a pointer to the specific
+ * helper, the location within the helper, and a trace of all local variables.
+ * The ring buffer may be displayed in a human-readable format with the
+ * ::dtrace_helptrace mdb(1) dcmd.
+ */
+#define	DTRACE_HELPTRACE_NEXT	(-1)
+#define	DTRACE_HELPTRACE_DONE	(-2)
+#define	DTRACE_HELPTRACE_ERR	(-3)
+
+typedef struct dtrace_helptrace {
+	dtrace_helper_action_t	*dtht_helper;	/* helper action */
+	int dtht_where;				/* where in helper action */
+	int dtht_nlocals;			/* number of locals */
+	int dtht_fault;				/* type of fault (if any) */
+	int dtht_fltoffs;			/* DIF offset */
+	uint64_t dtht_illval;			/* faulting value */
+	uint64_t dtht_locals[1];		/* local variables */
+} dtrace_helptrace_t;
+
+/*
+ * DTrace Credentials
+ *
+ * In probe context, we have limited flexibility to examine the credentials
+ * of the DTrace consumer that created a particular enabling.  We use
+ * the Least Privilege interfaces to cache the consumer's cred pointer and
+ * some facts about that credential in a dtrace_cred_t structure. These
+ * can limit the consumer's breadth of visibility and what actions the
+ * consumer may take.
+ */
+#define	DTRACE_CRV_ALLPROC		0x01
+#define	DTRACE_CRV_KERNEL		0x02
+#define	DTRACE_CRV_ALLZONE		0x04
+
+#define	DTRACE_CRV_ALL		(DTRACE_CRV_ALLPROC | DTRACE_CRV_KERNEL | \
+	DTRACE_CRV_ALLZONE)
+
+#define	DTRACE_CRA_PROC				0x0001
+#define	DTRACE_CRA_PROC_CONTROL			0x0002
+#define	DTRACE_CRA_PROC_DESTRUCTIVE_ALLUSER	0x0004
+#define	DTRACE_CRA_PROC_DESTRUCTIVE_ALLZONE	0x0008
+#define	DTRACE_CRA_PROC_DESTRUCTIVE_CREDCHG	0x0010
+#define	DTRACE_CRA_KERNEL			0x0020
+#define	DTRACE_CRA_KERNEL_DESTRUCTIVE		0x0040
+
+#define	DTRACE_CRA_ALL		(DTRACE_CRA_PROC | \
+	DTRACE_CRA_PROC_CONTROL | \
+	DTRACE_CRA_PROC_DESTRUCTIVE_ALLUSER | \
+	DTRACE_CRA_PROC_DESTRUCTIVE_ALLZONE | \
+	DTRACE_CRA_PROC_DESTRUCTIVE_CREDCHG | \
+	DTRACE_CRA_KERNEL | \
+	DTRACE_CRA_KERNEL_DESTRUCTIVE)
+
+typedef struct dtrace_cred {
+	cred_t			*dcr_cred;
+	uint8_t			dcr_destructive;
+	uint8_t			dcr_visible;
+	uint16_t		dcr_action;
+} dtrace_cred_t;
+
+/*
+ * DTrace Consumer State
+ *
+ * Each DTrace consumer has an associated dtrace_state structure that contains
+ * its in-kernel DTrace state -- including options, credentials, statistics and
+ * pointers to ECBs, buffers, speculations and formats.  A dtrace_state
+ * structure is also allocated for anonymous enablings.  When anonymous state
+ * is grabbed, the grabbing consumers dts_anon pointer is set to the grabbed
+ * dtrace_state structure.
+ */
+struct dtrace_state {
+	dev_t dts_dev;				/* device */
+	int dts_necbs;				/* total number of ECBs */
+	dtrace_ecb_t **dts_ecbs;		/* array of ECBs */
+	dtrace_epid_t dts_epid;			/* next EPID to allocate */
+	size_t dts_needed;			/* greatest needed space */
+	struct dtrace_state *dts_anon;		/* anon. state, if grabbed */
+	dtrace_activity_t dts_activity;		/* current activity */
+	dtrace_vstate_t dts_vstate;		/* variable state */
+	dtrace_buffer_t *dts_buffer;		/* principal buffer */
+	dtrace_buffer_t *dts_aggbuffer;		/* aggregation buffer */
+	dtrace_speculation_t *dts_speculations;	/* speculation array */
+	int dts_nspeculations;			/* number of speculations */
+	int dts_naggregations;			/* number of aggregations */
+	dtrace_aggregation_t **dts_aggregations; /* aggregation array */
+	vmem_t *dts_aggid_arena;		/* arena for aggregation IDs */
+	uint64_t dts_errors;			/* total number of errors */
+	uint32_t dts_speculations_busy;		/* number of spec. busy */
+	uint32_t dts_speculations_unavail;	/* number of spec unavail */
+	uint32_t dts_stkstroverflows;		/* stack string tab overflows */
+	uint32_t dts_dblerrors;			/* errors in ERROR probes */
+	uint32_t dts_reserve;			/* space reserved for END */
+	hrtime_t dts_laststatus;		/* time of last status */
+	cyclic_id_t dts_cleaner;		/* cleaning cyclic */
+	cyclic_id_t dts_deadman;		/* deadman cyclic */
+	hrtime_t dts_alive;			/* time last alive */
+	char dts_speculates;			/* boolean: has speculations */
+	char dts_destructive;			/* boolean: has dest. actions */
+	int dts_nformats;			/* number of formats */
+	char **dts_formats;			/* format string array */
+	dtrace_optval_t dts_options[DTRACEOPT_MAX]; /* options */
+	dtrace_cred_t dts_cred;			/* credentials */
+	size_t dts_nretained;			/* number of retained enabs */
+};
+
+struct dtrace_provider {
+	dtrace_pattr_t dtpv_attr;		/* provider attributes */
+	dtrace_ppriv_t dtpv_priv;		/* provider privileges */
+	dtrace_pops_t dtpv_pops;		/* provider operations */
+	char *dtpv_name;			/* provider name */
+	void *dtpv_arg;				/* provider argument */
+	uint_t dtpv_defunct;			/* boolean: defunct provider */
+	struct dtrace_provider *dtpv_next;	/* next provider */
+};
+
+struct dtrace_meta {
+	dtrace_mops_t dtm_mops;			/* meta provider operations */
+	char *dtm_name;				/* meta provider name */
+	void *dtm_arg;				/* meta provider user arg */
+	uint64_t dtm_count;			/* no. of associated provs. */
+};
+
+/*
+ * DTrace Enablings
+ *
+ * A dtrace_enabling structure is used to track a collection of ECB
+ * descriptions -- before they have been turned into actual ECBs.  This is
+ * created as a result of DOF processing, and is generally used to generate
+ * ECBs immediately thereafter.  However, enablings are also generally
+ * retained should the probes they describe be created at a later time; as
+ * each new module or provider registers with the framework, the retained
+ * enablings are reevaluated, with any new match resulting in new ECBs.  To
+ * prevent probes from being matched more than once, the enabling tracks the
+ * last probe generation matched, and only matches probes from subsequent
+ * generations.
+ */
+typedef struct dtrace_enabling {
+	dtrace_ecbdesc_t **dten_desc;		/* all ECB descriptions */
+	int dten_ndesc;				/* number of ECB descriptions */
+	int dten_maxdesc;			/* size of ECB array */
+	dtrace_vstate_t *dten_vstate;		/* associated variable state */
+	dtrace_genid_t dten_probegen;		/* matched probe generation */
+	dtrace_ecbdesc_t *dten_current;		/* current ECB description */
+	int dten_error;				/* current error value */
+	int dten_primed;			/* boolean: set if primed */
+	struct dtrace_enabling *dten_prev;	/* previous enabling */
+	struct dtrace_enabling *dten_next;	/* next enabling */
+} dtrace_enabling_t;
+
+/*
+ * DTrace Anonymous Enablings
+ *
+ * Anonymous enablings are DTrace enablings that are not associated with a
+ * controlling process, but rather derive their enabling from DOF stored as
+ * properties in the dtrace.conf file.  If there is an anonymous enabling, a
+ * DTrace consumer state and enabling are created on attach.  The state may be
+ * subsequently grabbed by the first consumer specifying the "grabanon"
+ * option.  As long as an anonymous DTrace enabling exists, dtrace(7D) will
+ * refuse to unload.
+ */
+typedef struct dtrace_anon {
+	dtrace_state_t *dta_state;		/* DTrace consumer state */
+	dtrace_enabling_t *dta_enabling;	/* pointer to enabling */
+	processorid_t dta_beganon;		/* which CPU BEGIN ran on */
+} dtrace_anon_t;
+
+/*
+ * DTrace Error Debugging
+ */
+#ifdef DEBUG
+#define	DTRACE_ERRDEBUG
+#endif
+
+#ifdef DTRACE_ERRDEBUG
+
+typedef struct dtrace_errhash {
+	const char	*dter_msg;	/* error message */
+	int		dter_count;	/* number of times seen */
+} dtrace_errhash_t;
+
+#define	DTRACE_ERRHASHSZ	256	/* must be > number of err msgs */
+
+#endif	/* DTRACE_ERRDEBUG */
+
+/*
+ * DTrace Toxic Ranges
+ *
+ * DTrace supports safe loads from probe context; if the address turns out to
+ * be invalid, a bit will be set by the kernel indicating that DTrace
+ * encountered a memory error, and DTrace will propagate the error to the user
+ * accordingly.  However, there may exist some regions of memory in which an
+ * arbitrary load can change system state, and from which it is impossible to
+ * recover from such a load after it has been attempted.  Examples of this may
+ * include memory in which programmable I/O registers are mapped (for which a
+ * read may have some implications for the device) or (in the specific case of
+ * UltraSPARC-I and -II) the virtual address hole.  The platform is required
+ * to make DTrace aware of these toxic ranges; DTrace will then check that
+ * target addresses are not in a toxic range before attempting to issue a
+ * safe load.
+ */
+typedef struct dtrace_toxrange {
+	uintptr_t	dtt_base;		/* base of toxic range */
+	uintptr_t	dtt_limit;		/* limit of toxic range */
+} dtrace_toxrange_t;
+
+extern uint64_t dtrace_getarg(int, int);
+extern greg_t dtrace_getfp(void);
+extern int dtrace_getipl(void);
+extern uintptr_t dtrace_caller(int);
+extern uint32_t dtrace_cas32(uint32_t *, uint32_t, uint32_t);
+extern void *dtrace_casptr(void *, void *, void *);
+extern void dtrace_copyin(uintptr_t, uintptr_t, size_t, volatile uint16_t *);
+extern void dtrace_copyinstr(uintptr_t, uintptr_t, size_t, volatile uint16_t *);
+extern void dtrace_copyout(uintptr_t, uintptr_t, size_t, volatile uint16_t *);
+extern void dtrace_copyoutstr(uintptr_t, uintptr_t, size_t,
+    volatile uint16_t *);
+extern void dtrace_getpcstack(pc_t *, int, int, uint32_t *);
+extern ulong_t dtrace_getreg(struct regs *, uint_t);
+extern int dtrace_getstackdepth(int);
+extern void dtrace_getupcstack(uint64_t *, int);
+extern void dtrace_getufpstack(uint64_t *, uint64_t *, int);
+extern int dtrace_getustackdepth(void);
+extern uintptr_t dtrace_fulword(void *);
+extern uint8_t dtrace_fuword8(void *);
+extern uint16_t dtrace_fuword16(void *);
+extern uint32_t dtrace_fuword32(void *);
+extern uint64_t dtrace_fuword64(void *);
+extern void dtrace_probe_error(dtrace_state_t *, dtrace_epid_t, int, int,
+    int, uintptr_t);
+extern int dtrace_assfail(const char *, const char *, int);
+extern int dtrace_attached(void);
+extern hrtime_t dtrace_gethrestime();
+
+#ifdef __sparc
+extern void dtrace_flush_windows(void);
+extern void dtrace_flush_user_windows(void);
+extern uint_t dtrace_getotherwin(void);
+extern uint_t dtrace_getfprs(void);
+#else
+extern void dtrace_copy(uintptr_t, uintptr_t, size_t);
+extern void dtrace_copystr(uintptr_t, uintptr_t, size_t, volatile uint16_t *);
+#endif
+
+/*
+ * DTrace Assertions
+ *
+ * DTrace calls ASSERT from probe context.  To assure that a failed ASSERT
+ * does not induce a markedly more catastrophic failure (e.g., one from which
+ * a dump cannot be gleaned), DTrace must define its own ASSERT to be one that
+ * may safely be called from probe context.  This header file must thus be
+ * included by any DTrace component that calls ASSERT from probe context, and
+ * _only_ by those components.  (The only exception to this is kernel
+ * debugging infrastructure at user-level that doesn't depend on calling
+ * ASSERT.)
+ */
+#undef ASSERT
+#ifdef DEBUG
+#define	ASSERT(EX)	((void)((EX) || \
+			dtrace_assfail(#EX, __FILE__, __LINE__)))
+#else
+#define	ASSERT(X)	((void)0)
+#endif
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif /* _SYS_DTRACE_IMPL_H */
diff --git a/cddl/contrib/opensolaris/uts/common/sys/fasttrap.h b/cddl/contrib/opensolaris/uts/common/sys/fasttrap.h
new file mode 100644
index 0000000..7f80314
--- /dev/null
+++ b/cddl/contrib/opensolaris/uts/common/sys/fasttrap.h
@@ -0,0 +1,93 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef	_SYS_FASTTRAP_H
+#define	_SYS_FASTTRAP_H
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <sys/fasttrap_isa.h>
+#include <sys/dtrace.h>
+#include <sys/types.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#define	FASTTRAPIOC		(('m' << 24) | ('r' << 16) | ('f' << 8))
+#define	FASTTRAPIOC_MAKEPROBE	(FASTTRAPIOC | 1)
+#define	FASTTRAPIOC_GETINSTR	(FASTTRAPIOC | 2)
+
+typedef enum fasttrap_probe_type {
+	DTFTP_NONE = 0,
+	DTFTP_ENTRY,
+	DTFTP_RETURN,
+	DTFTP_OFFSETS,
+	DTFTP_POST_OFFSETS,
+	DTFTP_IS_ENABLED
+} fasttrap_probe_type_t;
+
+typedef struct fasttrap_probe_spec {
+	pid_t			ftps_pid;
+	fasttrap_probe_type_t	ftps_type;
+
+	char			ftps_func[DTRACE_FUNCNAMELEN];
+	char			ftps_mod[DTRACE_MODNAMELEN];
+
+	uint64_t		ftps_pc;
+	uint64_t		ftps_size;
+	uint64_t		ftps_noffs;
+	uint64_t		ftps_offs[1];
+} fasttrap_probe_spec_t;
+
+typedef struct fasttrap_instr_query {
+	uint64_t		ftiq_pc;
+	pid_t			ftiq_pid;
+	fasttrap_instr_t	ftiq_instr;
+} fasttrap_instr_query_t;
+
+/*
+ * To support the fasttrap provider from very early in a process's life,
+ * the run-time linker, ld.so.1, has a program header of type PT_SUNWDTRACE
+ * which points to a data object which must be PT_SUNWDTRACE_SIZE bytes.
+ * This structure mimics the fasttrap provider section of the ulwp_t structure.
+ * When the fasttrap provider is changed to require new or different
+ * instructions, the data object in ld.so.1 and the thread initializers in libc
+ * (libc_init() and _thrp_create()) need to be updated to include the new
+ * instructions, and PT_SUNWDTRACE needs to be changed to a new unique number
+ * (while the old value gets assigned something like PT_SUNWDTRACE_1). Since the
+ * linker must be backward compatible with old Solaris releases, it must have
+ * program headers for each of the PT_SUNWDTRACE versions. The kernel's
+ * elfexec() function only has to look for the latest version of the
+ * PT_SUNWDTRACE program header.
+ */
+#define	PT_SUNWDTRACE_SIZE	FASTTRAP_SUNWDTRACE_SIZE
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* _SYS_FASTTRAP_H */
diff --git a/cddl/contrib/opensolaris/uts/intel/sys/fasttrap_isa.h b/cddl/contrib/opensolaris/uts/intel/sys/fasttrap_isa.h
new file mode 100644
index 0000000..9fee8cd
--- /dev/null
+++ b/cddl/contrib/opensolaris/uts/intel/sys/fasttrap_isa.h
@@ -0,0 +1,114 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef	_FASTTRAP_ISA_H
+#define	_FASTTRAP_ISA_H
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <sys/types.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#define	FASTTRAP_MAX_INSTR_SIZE		15
+
+#define	FASTTRAP_INSTR			0xcc
+
+#define	FASTTRAP_SUNWDTRACE_SIZE	64
+
+typedef	uint8_t		fasttrap_instr_t;
+
+typedef struct fasttrap_machtp {
+	uint8_t		ftmt_instr[FASTTRAP_MAX_INSTR_SIZE]; /* orig. instr. */
+	uint8_t		ftmt_size;	/* instruction size */
+#ifdef __amd64
+	uint8_t		ftmt_ripmode;	/* %rip-relative handling mode */
+	uint8_t		ftmt_modrm;	/* saved modrm byte */
+#endif
+	uint8_t		ftmt_type;	/* emulation type */
+	uint8_t		ftmt_code;	/* branch condition */
+	uint8_t		ftmt_base;	/* branch base */
+	uint8_t		ftmt_index;	/* branch index */
+	uint8_t		ftmt_scale;	/* branch scale */
+	uint8_t		ftmt_segment;	/* segment for memory accesses */
+	uintptr_t	ftmt_dest;	/* destination of control flow */
+} fasttrap_machtp_t;
+
+#define	ftt_instr	ftt_mtp.ftmt_instr
+#ifdef __amd64
+#define	ftt_ripmode	ftt_mtp.ftmt_ripmode
+#define	ftt_modrm	ftt_mtp.ftmt_modrm
+#endif
+#define	ftt_size	ftt_mtp.ftmt_size
+#define	ftt_type	ftt_mtp.ftmt_type
+#define	ftt_code	ftt_mtp.ftmt_code
+#define	ftt_base	ftt_mtp.ftmt_base
+#define	ftt_index	ftt_mtp.ftmt_index
+#define	ftt_scale	ftt_mtp.ftmt_scale
+#define	ftt_segment	ftt_mtp.ftmt_segment
+#define	ftt_dest	ftt_mtp.ftmt_dest
+
+#define	FASTTRAP_T_COMMON	0x00	/* common case -- no emulation */
+#define	FASTTRAP_T_JCC		0x01	/* near and far conditional jumps */
+#define	FASTTRAP_T_LOOP		0x02	/* loop instructions */
+#define	FASTTRAP_T_JCXZ		0x03	/* jump if %ecx/%rcx is zero */
+#define	FASTTRAP_T_JMP		0x04	/* relative jump */
+#define	FASTTRAP_T_CALL		0x05	/* near call (and link) */
+#define	FASTTRAP_T_RET		0x06	/* ret */
+#define	FASTTRAP_T_RET16	0x07	/* ret <imm16> */
+
+/*
+ * For performance rather than correctness.
+ */
+#define	FASTTRAP_T_PUSHL_EBP	0x10	/* pushl %ebp (for function entry) */
+#define	FASTTRAP_T_NOP		0x11	/* nop */
+
+#define	FASTTRAP_RIP_1		0x1
+#define	FASTTRAP_RIP_2		0x2
+#define	FASTTRAP_RIP_X		0x4
+
+/*
+ * Segment values.
+ */
+#define	FASTTRAP_SEG_NONE		0
+#define	FASTTRAP_SEG_CS			1
+#define	FASTTRAP_SEG_DS			2
+#define	FASTTRAP_SEG_ES			3
+#define	FASTTRAP_SEG_FS			4
+#define	FASTTRAP_SEG_GS			5
+#define	FASTTRAP_SEG_SS			6
+
+#define	FASTTRAP_AFRAMES		3
+#define	FASTTRAP_RETURN_AFRAMES		4
+#define	FASTTRAP_ENTRY_AFRAMES		3
+#define	FASTTRAP_OFFSET_AFRAMES		3
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* _FASTTRAP_ISA_H */
diff --git a/cddl/contrib/opensolaris/uts/sparc/sys/fasttrap_isa.h b/cddl/contrib/opensolaris/uts/sparc/sys/fasttrap_isa.h
new file mode 100644
index 0000000..10361cbe
--- /dev/null
+++ b/cddl/contrib/opensolaris/uts/sparc/sys/fasttrap_isa.h
@@ -0,0 +1,94 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef	_FASTTRAP_ISA_H
+#define	_FASTTRAP_ISA_H
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <sys/types.h>
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+/*
+ * This is our reserved trap instruction: ta 0x38
+ */
+#define	FASTTRAP_INSTR			0x91d02038
+
+#define	FASTTRAP_SUNWDTRACE_SIZE	128
+
+typedef uint32_t	fasttrap_instr_t;
+
+typedef struct fasttrap_machtp {
+	fasttrap_instr_t	ftmt_instr;	/* original instruction */
+	uintptr_t		ftmt_dest;	/* destination of DCTI */
+	uint8_t			ftmt_type;	/* emulation type */
+	uint8_t			ftmt_flags;	/* emulation flags */
+	uint8_t			ftmt_cc;	/* which cc to look at */
+	uint8_t			ftmt_code;	/* branch condition */
+} fasttrap_machtp_t;
+
+#define	ftt_instr	ftt_mtp.ftmt_instr
+#define	ftt_dest	ftt_mtp.ftmt_dest
+#define	ftt_type	ftt_mtp.ftmt_type
+#define	ftt_flags	ftt_mtp.ftmt_flags
+#define	ftt_cc		ftt_mtp.ftmt_cc
+#define	ftt_code	ftt_mtp.ftmt_code
+
+#define	FASTTRAP_T_COMMON	0x00	/* common case -- no emulation */
+#define	FASTTRAP_T_CCR		0x01	/* integer condition code branch */
+#define	FASTTRAP_T_FCC		0x02	/* floating-point branch */
+#define	FASTTRAP_T_REG		0x03	/* register predicated branch */
+#define	FASTTRAP_T_ALWAYS	0x04	/* branch always */
+#define	FASTTRAP_T_CALL		0x05	/* call instruction */
+#define	FASTTRAP_T_JMPL		0x06	/* jmpl instruction */
+#define	FASTTRAP_T_RDPC		0x07	/* rdpc instruction */
+#define	FASTTRAP_T_RETURN	0x08	/* return instruction */
+
+/*
+ * For performance rather than correctness.
+ */
+#define	FASTTRAP_T_SAVE		0x10	/* save instruction (func entry only) */
+#define	FASTTRAP_T_RESTORE	0x11	/* restore instruction */
+#define	FASTTRAP_T_OR		0x12	/* mov instruction */
+#define	FASTTRAP_T_SETHI	0x13	/* sethi instruction (includes nop) */
+
+#define	FASTTRAP_F_ANNUL	0x01	/* branch is annulled */
+#define	FASTTRAP_F_RETMAYBE	0x02	/* not definitely a return site */
+
+#define	FASTTRAP_AFRAMES		3
+#define	FASTTRAP_RETURN_AFRAMES		4
+#define	FASTTRAP_ENTRY_AFRAMES		3
+#define	FASTTRAP_OFFSET_AFRAMES		3
+
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* _FASTTRAP_ISA_H */