setjmp.S revision 1.7 
1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * William Jolitz.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <machine/asm.h>
34
35#if defined(LIBC_SCCS)
36	.text
37	.asciz "$OpenBSD: setjmp.S,v 1.7 2005/04/01 08:08:15 hshoexer Exp $"
38#endif
39
40/*
41 * C library -- setjmp, longjmp
42 *
43 *	longjmp(a,v)
44 * will generate a "return(v)" from the last call to
45 *	setjmp(a)
46 * by restoring registers from the stack.
47 * The previous signal state is restored.
48 */
49
50ENTRY(setjmp)
51	PIC_PROLOGUE
52	pushl	$0
53#ifdef PIC
54	call	PIC_PLT(_C_LABEL(sigblock))
55#else
56	call	_C_LABEL(sigblock)
57#endif
58	addl	$4,%esp
59	PIC_EPILOGUE
60
61	movl	4(%esp),%ecx
62	movl	0(%esp),%edx
63	movl	%edx, 0(%ecx)
64	movl	%ebx, 4(%ecx)
65	movl	%esp, 8(%ecx)
66	movl	%ebp,12(%ecx)
67	movl	%esi,16(%ecx)
68	movl	%edi,20(%ecx)
69	movl	%eax,24(%ecx)
70	xorl	%eax,%eax
71	ret
72
73ENTRY(longjmp)
74	movl	4(%esp),%edx
75	PIC_PROLOGUE
76	pushl	24(%edx)
77#ifdef PIC
78	call	PIC_PLT(_C_LABEL(sigsetmask))
79#else
80	call	_C_LABEL(sigsetmask)
81#endif
82	addl	$4,%esp
83	PIC_EPILOGUE
84
85	movl	4(%esp),%edx
86	movl	8(%esp),%eax
87	movl	0(%edx),%ecx
88	movl	4(%edx),%ebx
89	movl	8(%edx),%esp
90	movl	12(%edx),%ebp
91	movl	16(%edx),%esi
92	movl	20(%edx),%edi
93	testl	%eax,%eax
94	jnz	1f
95	incl	%eax
961:	movl	%ecx,0(%esp)
97	ret
98