Add libdtrace support for tracing userland programs.

Summary of changes:
* Implement a compatibility shim between Solaris libproc and our
libproc and remove several ifdefs because of this.
* Port the drti to FreeBSD.
* Implement the missing DOODAD sections
* Link with libproc and librtld_db
* Support for ustack, jstack and uregs (by sson@)
* Misc bugfixing

When writing the SUWN_dof section, we had to resort to building the ELF
file layout by "hand". This is the job of libelf, but our libelf doesn't
support this yet. When libelf is fixed, we can remove the code under
#ifdef BROKEN_LIBELF.

Sponsored by:	The FreeBSD Foundation

1 files changed, 44 insertions, 0 deletions

diff --git a/cddl/contrib/opensolaris/lib/libdtrace/i386/dt_isadep.c b/cddl/contrib/opensolaris/lib/libdtrace/i386/dt_isadep.c
index c1484a4..ad1c032 100644
--- a/cddl/contrib/opensolaris/lib/libdtrace/i386/dt_isadep.c
+++ b/cddl/contrib/opensolaris/lib/libdtrace/i386/dt_isadep.c
@@ -35,6 +35,12 @@
 
 #include <dis_tables.h>
 
+#if !defined(sun)
+#define PR_MODEL_ILP32	1
+#define PR_MODEL_LP64	2
+#include <libproc_compat.h>
+#endif
+
 #define	DT_POPL_EBP	0x5d
 #define	DT_RET		0xc3
 #define	DT_RET16	0xc2
@@ -78,8 +84,17 @@ dt_pid_has_jump_table(struct ps_prochandle *P, dtrace_hdl_t *dtp,
 {
 	ulong_t i;
 	int size;
+#if defined(sun)
 	pid_t pid = Pstatus(P)->pr_pid;
 	char dmodel = Pstatus(P)->pr_dmodel;
+#else
+	pid_t pid = proc_getpid(P);
+#if __i386__
+	char dmodel = PR_MODEL_ILP32;
+#elif __amd64__
+	char dmodel = PR_MODEL_LP64;
+#endif
+#endif
 
 	/*
 	 * Take a pass through the function looking for a register-dependant
@@ -98,6 +113,7 @@ dt_pid_has_jump_table(struct ps_prochandle *P, dtrace_hdl_t *dtp,
 			return (1);
 		}
 
+#ifdef notyet
 		/*
 		 * Register-dependant jmp instructions start with a 0xff byte
 		 * and have the modrm.reg field set to 4. They can have an
@@ -110,6 +126,7 @@ dt_pid_has_jump_table(struct ps_prochandle *P, dtrace_hdl_t *dtp,
 			    ftp->ftps_func, i);
 			return (1);
 		}
+#endif
 	}
 
 	return (0);
@@ -123,8 +140,17 @@ dt_pid_create_return_probe(struct ps_prochandle *P, dtrace_hdl_t *dtp,
 	uint8_t *text;
 	ulong_t i, end;
 	int size;
+#if defined(sun)
 	pid_t pid = Pstatus(P)->pr_pid;
 	char dmodel = Pstatus(P)->pr_dmodel;
+#else
+	pid_t pid = proc_getpid(P);
+#if __i386__
+	char dmodel = PR_MODEL_ILP32;
+#elif __amd64__
+	char dmodel = PR_MODEL_LP64;
+#endif
+#endif
 
 	/*
 	 * We allocate a few extra bytes at the end so we don't have to check
@@ -275,8 +301,17 @@ dt_pid_create_offset_probe(struct ps_prochandle *P, dtrace_hdl_t *dtp,
 		uint8_t *text;
 		ulong_t i;
 		int size;
+#if defined(sun)
 		pid_t pid = Pstatus(P)->pr_pid;
 		char dmodel = Pstatus(P)->pr_dmodel;
+#else
+		pid_t pid = proc_getpid(P);
+#if __i386__
+		char dmodel = PR_MODEL_ILP32;
+#elif __amd64__
+		char dmodel = PR_MODEL_LP64;
+#endif
+#endif
 
 		if ((text = malloc(symp->st_size)) == NULL) {
 			dt_dprintf("mr sparkle: malloc() failed\n");
@@ -349,8 +384,17 @@ dt_pid_create_glob_offset_probes(struct ps_prochandle *P, dtrace_hdl_t *dtp,
 	uint8_t *text;
 	int size;
 	ulong_t i, end = symp->st_size;
+#if defined(sun)
 	pid_t pid = Pstatus(P)->pr_pid;
 	char dmodel = Pstatus(P)->pr_dmodel;
+#else
+	pid_t pid = proc_getpid(P);
+#if __i386__
+	char dmodel = PR_MODEL_ILP32;
+#elif __amd64__
+	char dmodel = PR_MODEL_LP64;
+#endif
+#endif
 
 	ftp->ftps_type = DTFTP_OFFSETS;
 	ftp->ftps_pc = (uintptr_t)symp->st_value;