setjmp.S revision 85437 
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. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#if defined(LIBC_RCS) && !defined(lint)
38	.text
39	.asciz "$FreeBSD: head/lib/libc/amd64/gen/setjmp.S 85437 2001-10-24 20:29:14Z peter $"
40#endif /* LIBC_RCS and not lint */
41
42/*
43 * C library -- _setjmp, _longjmp
44 *
45 *	longjmp(a,v)
46 * will generate a "return(v)" from the last call to
47 *	setjmp(a)
48 * by restoring registers from the environment 'a'.
49 * The previous signal state is restored.
50 */
51
52#include "SYS.h"
53
54ENTRY(setjmp)
55	movl	4(%esp),%ecx
56	PIC_PROLOGUE
57	leal	28(%ecx), %eax
58	pushl	%eax			/* (sigset_t*)oset */
59	pushl	$0			/* (sigset_t*)set  */
60	pushl	$1			/* SIG_BLOCK       */
61	call	PIC_PLT(CNAME(_sigprocmask))
62	addl	$12,%esp
63	PIC_EPILOGUE
64	movl	4(%esp),%ecx
65	movl	0(%esp),%edx
66	movl	%edx, 0(%ecx)
67	movl	%ebx, 4(%ecx)
68	movl	%esp, 8(%ecx)
69	movl	%ebp,12(%ecx)
70	movl	%esi,16(%ecx)
71	movl	%edi,20(%ecx)
72	fnstcw	24(%ecx)
73	xorl	%eax,%eax
74	ret
75
76	.weak CNAME(longjmp)
77	.set CNAME(longjmp),CNAME(__longjmp)
78ENTRY(__longjmp)
79	movl	4(%esp),%edx
80	PIC_PROLOGUE
81	pushl	$0			/* (sigset_t*)oset */
82	leal	28(%edx), %eax
83	pushl	%eax			/* (sigset_t*)set  */
84	pushl	$3			/* SIG_SETMASK     */
85	call	PIC_PLT(CNAME(_sigprocmask))
86	addl	$12,%esp
87	PIC_EPILOGUE
88	movl	4(%esp),%edx
89	movl	8(%esp),%eax
90	movl	0(%edx),%ecx
91	movl	4(%edx),%ebx
92	movl	8(%edx),%esp
93	movl	12(%edx),%ebp
94	movl	16(%edx),%esi
95	movl	20(%edx),%edi
96	fninit
97	fldcw	24(%edx)
98	testl	%eax,%eax
99	jnz	1f
100	incl	%eax
1011:	movl	%ecx,0(%esp)
102	ret
103