setjmp.S revision 71579 
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 * $FreeBSD: head/lib/libc/i386/gen/setjmp.S 71579 2001-01-24 13:01:12Z deischen $
37 */
38
39#if defined(LIBC_RCS) && !defined(lint)
40	.text
41	.asciz "$FreeBSD: head/lib/libc/i386/gen/setjmp.S 71579 2001-01-24 13:01:12Z deischen $"
42#endif /* LIBC_RCS and not lint */
43
44/*
45 * C library -- _setjmp, _longjmp
46 *
47 *	longjmp(a,v)
48 * will generate a "return(v)" from the last call to
49 *	setjmp(a)
50 * by restoring registers from the environment 'a'.
51 * The previous signal state is restored.
52 */
53
54#include "DEFS.h"
55#include "SYS.h"
56
57ENTRY(setjmp)
58	movl	4(%esp),%ecx
59	PIC_PROLOGUE
60	leal	28(%ecx), %eax
61	pushl	%eax			/* (sigset_t*)oset */
62	pushl	$0			/* (sigset_t*)set  */
63	pushl	$1			/* SIG_BLOCK       */
64	call	PIC_PLT(CNAME(_sigprocmask))
65	addl	$12,%esp
66	PIC_EPILOGUE
67	movl	4(%esp),%ecx
68	movl	0(%esp),%edx
69	movl	%edx, 0(%ecx)
70	movl	%ebx, 4(%ecx)
71	movl	%esp, 8(%ecx)
72	movl	%ebp,12(%ecx)
73	movl	%esi,16(%ecx)
74	movl	%edi,20(%ecx)
75	fnstcw	24(%ecx)
76	xorl	%eax,%eax
77	ret
78
79	.weak CNAME(longjmp)
80	.set CNAME(longjmp),CNAME(__longjmp)
81ENTRY(__longjmp)
82	movl	4(%esp),%edx
83	PIC_PROLOGUE
84	pushl	$0			/* (sigset_t*)oset */
85	leal	28(%edx), %eax
86	pushl	%eax			/* (sigset_t*)set  */
87	pushl	$3			/* SIG_SETMASK     */
88	call	PIC_PLT(CNAME(_sigprocmask))
89	addl	$12,%esp
90	PIC_EPILOGUE
91	movl	4(%esp),%edx
92	movl	8(%esp),%eax
93	movl	0(%edx),%ecx
94	movl	4(%edx),%ebx
95	movl	8(%edx),%esp
96	movl	12(%edx),%ebp
97	movl	16(%edx),%esi
98	movl	20(%edx),%edi
99	fninit
100	fldcw	24(%edx)
101	testl	%eax,%eax
102	jnz	1f
103	incl	%eax
1041:	movl	%ecx,0(%esp)
105	ret
106