Add BASIC i386 binary support for the amd64 kernel. This is largely

stolen from the ia64/ia32 code (indeed there was a repocopy), but I've
redone the MD parts and added and fixed a few essential syscalls.  It
is sufficient to run i386 binaries like /bin/ls, /usr/bin/id (dynamic)
and p4.  The ia64 code has not implemented signal delivery, so I had
to do that.

Before you say it, yes, this does need to go in a common place.  But
we're in a freeze at the moment and I didn't want to risk breaking ia64.
I will sort this out after the freeze so that the common code is in a
common place.

On the AMD64 side, this required adding segment selector context switch
support and some other support infrastructure.  The %fs/%gs etc code
is hairy because loading %gs will clobber the kernel's current MSR_GSBASE
setting.  The segment selectors are not used by the kernel, so they're only
changed at context switch time or when changing modes.  This still needs
to be optimized.

Approved by:	re (amd64/* blanket)

1 files changed, 164 insertions, 0 deletions

diff --git a/sys/compat/ia32/ia32_signal.h b/sys/compat/ia32/ia32_signal.h
new file mode 100644
index 0000000..f251e72
--- /dev/null
+++ b/sys/compat/ia32/ia32_signal.h
@@ -0,0 +1,164 @@
+/*-
+ * Copyright (c) 1999 Marcel Moolenaar
+ * Copyright (c) 2003 Peter Wemm
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer 
+ *    in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+struct ia32_sigaltstack {
+	u_int32_t	ss_sp;		/* signal stack base */
+	u_int32_t	ss_size;	/* signal stack length */
+	int		ss_flags;	/* SS_DISABLE and/or SS_ONSTACK */
+};
+
+/* XXX should be 640 bytes long; check and see if __packed is needed */
+struct ia32_mcontext {
+	int	mc_onstack;		/* XXX - sigcontext compat. */
+	int	mc_gs;			/* machine state (struct trapframe) */
+	int	mc_fs;
+	int	mc_es;
+	int	mc_ds;
+	int	mc_edi;
+	int	mc_esi;
+	int	mc_ebp;
+	int	mc_isp;
+	int	mc_ebx;
+	int	mc_edx;
+	int	mc_ecx;
+	int	mc_eax;
+	int	mc_trapno;
+	int	mc_err;
+	int	mc_eip;
+	int	mc_cs;
+	int	mc_eflags;
+	int	mc_esp;
+	int	mc_ss;
+	int	mc_len;			/* sizeof(struct ia32_mcontext) */
+	/* We use the same values for fpformat and ownedfp */
+	int	mc_fpformat;
+	int	mc_ownedfp;
+	int	mc_spare1[1];		/* align next field to 16 bytes */
+	/*
+	 * See <machine/npx.h> for the internals of mc_fpstate[].
+	 */
+	int	mc_fpstate[128] __aligned(16);
+	int	mc_spare2[8];
+};
+
+/* XXX should be 704 bytes long; check and see if __packed is needed */
+struct ia32_ucontext {
+	sigset_t		uc_sigmask;
+	struct ia32_mcontext	uc_mcontext;
+	u_int32_t		uc_link;
+	struct ia32_sigaltstack	uc_stack;
+	int			uc_flags;
+	int			__spare__[4];
+};
+
+
+#if defined(COMPAT_FREEBSD4)
+struct ia32_mcontext4 {
+	int	mc_onstack;		/* XXX - sigcontext compat. */
+	int	mc_gs;			/* machine state (struct trapframe) */
+	int	mc_fs;
+	int	mc_es;
+	int	mc_ds;
+	int	mc_edi;
+	int	mc_esi;
+	int	mc_ebp;
+	int	mc_isp;
+	int	mc_ebx;
+	int	mc_edx;
+	int	mc_ecx;
+	int	mc_eax;
+	int	mc_trapno;
+	int	mc_err;
+	int	mc_eip;
+	int	mc_cs;
+	int	mc_eflags;
+	int	mc_esp;	
+	int	mc_ss;
+	int	mc_fpregs[28];
+	int	__spare__[17];
+};
+
+struct ia32_ucontext4 {
+	sigset_t		uc_sigmask;
+	struct ia32_mcontext4	uc_mcontext;
+	u_int32_t		uc_link;
+	struct ia32_sigaltstack	uc_stack;
+	int			__spare__[8];
+};
+#endif
+
+/*
+ * Signal frames, arguments passed to application signal handlers.
+ */
+union ia32_sigval {
+	int			sigval_int;
+	u_int32_t		sigval_ptr;
+};
+struct ia32_siginfo {
+	int			si_signo;	/* signal number */
+	int			si_errno;	/* errno association */
+	int			si_code;	/* signal code */
+	int32_t			si_pid;		/* sending process */
+	u_int32_t		si_uid;		/* sender's ruid */
+	int			si_status;	/* exit value */
+	u_int32_t		si_addr;	/* faulting instruction */
+	union ia32_sigval	si_value;	/* signal value */
+	int32_t			si_band;	/* band event for SIGPOLL */
+	int			__spare__[7];	/* gimme some slack */
+};
+
+#ifdef COMPAT_FREEBSD4
+struct ia32_sigframe4 {
+	u_int32_t		sf_signum;
+	u_int32_t		sf_siginfo;	/* code or pointer to sf_si */
+	u_int32_t		sf_ucontext;	/* points to sf_uc */
+	u_int32_t		sf_addr;	/* undocumented 4th arg */
+	u_int32_t		sf_ah;		/* action/handler pointer */
+	struct ia32_ucontext4	sf_uc;		/* = *sf_ucontext */
+	struct ia32_siginfo	sf_si;		/* = *sf_siginfo (SA_SIGINFO case) */
+};
+#endif
+
+struct ia32_sigframe {
+	u_int32_t		sf_signum;
+	u_int32_t		sf_siginfo;	/* code or pointer to sf_si */
+	u_int32_t		sf_ucontext;	/* points to sf_uc */
+	u_int32_t		sf_addr;	/* undocumented 4th arg */
+	u_int32_t		sf_ah;		/* action/handler pointer */
+	struct ia32_ucontext	sf_uc;		/* = *sf_ucontext */
+	struct ia32_siginfo	sf_si;		/* = *sf_siginfo (SA_SIGINFO case) */
+};
+
+extern char ia32_sigcode[];
+extern char freebsd4_ia32_sigcode[];
+extern int sz_ia32_sigcode;
+extern int sz_freebsd4_ia32_sigcode;
+extern void ia32_sendsig(sig_t, int, sigset_t *, u_long);