ia32_sigtramp.S revision 162572 
1/*-
2 * Copyright (c) 2003 Peter Wemm
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/sys/amd64/ia32/ia32_sigtramp.S 162572 2006-09-23 13:42:09Z davidxu $
27 */
28
29#include "opt_compat.h"
30
31#include <machine/asmacros.h>
32#include <sys/syscall.h>
33
34#include "ia32_assym.h"
35
36	.text
37	.code32
38/*
39 * Signal trampoline, copied to top of user stack
40 * XXX may need to be MD to match backend sendsig handoff protocol
41 */
42	ALIGN_TEXT
43	.globl	ia32_sigcode
44ia32_sigcode:
45	calll	*IA32_SIGF_HANDLER(%esp)
46	leal	IA32_SIGF_UC(%esp),%eax	/* get ucontext */
47	pushl	%eax
48	movl	IA32_UC_ES(%eax),%es	/* restore %es */
49	movl	IA32_UC_DS(%eax),%ds	/* restore %ds */
50	movl	$SYS_sigreturn,%eax
51	pushl	%eax			/* junk to fake return addr. */
52	int	$0x80			/* enter kernel with args */
53					/* on stack */
541:
55	jmp	1b
56
57#ifdef COMPAT_FREEBSD4
58	ALIGN_TEXT
59freebsd4_ia32_sigcode:
60	calll	*IA32_SIGF_HANDLER(%esp)
61	leal	IA32_SIGF_UC4(%esp),%eax/* get ucontext */
62	pushl	%eax
63	movl	IA32_UC4_ES(%eax),%es	/* restore %es */
64	movl	IA32_UC4_DS(%eax),%ds	/* restore %ds */
65	movl	$344,%eax		/* 4.x SYS_sigreturn */
66	pushl	%eax			/* junk to fake return addr. */
67	int	$0x80			/* enter kernel with args */
68					/* on stack */
691:
70	jmp	1b
71#endif
72
73	ALIGN_TEXT
74esigcode:
75
76	.data
77	.globl	sz_ia32_sigcode
78sz_ia32_sigcode:
79	.long	esigcode-ia32_sigcode
80#ifdef COMPAT_FREEBSD4
81	.globl	sz_freebsd4_ia32_sigcode
82sz_freebsd4_ia32_sigcode:
83	.long	esigcode-freebsd4_ia32_sigcode
84#endif
85