setjmp.S revision 54607 
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/amd64/gen/setjmp.S 54607 1999-12-14 20:17:52Z jasone $
37 */
38
39#if defined(LIBC_RCS) && !defined(lint)
40	.text
41	.asciz "$FreeBSD: head/lib/libc/amd64/gen/setjmp.S 54607 1999-12-14 20:17:52Z jasone $"
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.weak setjmp;
59.set setjmp, __setjmp;
60	movl	4(%esp),%ecx
61	PIC_PROLOGUE
62	leal	28(%ecx), %eax
63	pushl	%eax			/* (sigset_t*)oset */
64	pushl	$0			/* (sigset_t*)set  */
65	pushl	$1			/* SIG_BLOCK       */
66#ifdef _THREAD_SAFE
67	call	PIC_PLT(CNAME(_thread_sys_sigprocmask))
68#else
69	call	PIC_PLT(CNAME(sigprocmask))
70#endif
71	addl	$12,%esp
72	PIC_EPILOGUE
73	movl	4(%esp),%ecx
74	movl	0(%esp),%edx
75	movl	%edx, 0(%ecx)
76	movl	%ebx, 4(%ecx)
77	movl	%esp, 8(%ecx)
78	movl	%ebp,12(%ecx)
79	movl	%esi,16(%ecx)
80	movl	%edi,20(%ecx)
81	fnstcw	24(%ecx)
82	xorl	%eax,%eax
83	ret
84
85ENTRY(__longjmp)
86.weak longjmp;
87.set longjmp, __longjmp;
88	movl	4(%esp),%edx
89	PIC_PROLOGUE
90	pushl	$0			/* (sigset_t*)oset */
91	leal	28(%edx), %eax
92	pushl	%eax			/* (sigset_t*)set  */
93	pushl	$3			/* SIG_SETMASK     */
94#ifdef _THREAD_SAFE
95	call	PIC_PLT(CNAME(_thread_sys_sigprocmask))
96#else
97	call	PIC_PLT(CNAME(sigprocmask))
98#endif
99	addl	$12,%esp
100	PIC_EPILOGUE
101	movl	4(%esp),%edx
102	movl	8(%esp),%eax
103	movl	0(%edx),%ecx
104	movl	4(%edx),%ebx
105	movl	8(%edx),%esp
106	movl	12(%edx),%ebp
107	movl	16(%edx),%esi
108	movl	20(%edx),%edi
109	fninit
110	fldcw	24(%edx)
111	testl	%eax,%eax
112	jnz	1f
113	incl	%eax
1141:	movl	%ecx,0(%esp)
115	ret
116