setjmp.S revision 5244 
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_SCCS) && !defined(lint)
38	.asciz "@(#)setjmp.s	5.1 (Berkeley) 4/23/90"
39#endif /* LIBC_SCCS and not lint */
40
41/*
42 * C library -- _setjmp, _longjmp
43 *
44 *	longjmp(a,v)
45 * will generate a "return(v)" from the last call to
46 *	setjmp(a)
47 * by restoring registers from the environment 'a'.
48 * The previous signal state is restored.
49 */
50
51#include "DEFS.h"
52#include "SYS.h"
53
54ENTRY(setjmp)
55	pushl	$0
56	call	PIC_PLT(_sigblock)
57	popl	%edx
58	movl	4(%esp),%ecx
59	movl	0(%esp),%edx
60	movl	%edx, 0(%ecx)
61	movl	%ebx, 4(%ecx)
62	movl	%esp, 8(%ecx)
63	movl	%ebp,12(%ecx)
64	movl	%esi,16(%ecx)
65	movl	%edi,20(%ecx)
66	movl	%eax,24(%ecx)
67	fnstcw	28(%ecx)
68	xorl	%eax,%eax
69	ret
70
71ENTRY(longjmp)
72	movl	4(%esp),%edx
73	pushl	24(%edx)
74	call	PIC_PLT(_sigsetmask)	/* XXX this is not reentrant */
75	popl	%eax
76	movl	4(%esp),%edx
77	movl	8(%esp),%eax
78	movl	0(%edx),%ecx
79	movl	4(%edx),%ebx
80	movl	8(%edx),%esp
81	movl	12(%edx),%ebp
82	movl	16(%edx),%esi
83	movl	20(%edx),%edi
84	fninit
85	fldcw	28(%edx)
86	testl	%eax,%eax
87	jnz	1f
88	incl	%eax
891:	movl	%ecx,0(%esp)
90	ret
91