_setjmp.S revision 115745 
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#include <machine/asm.h>
41__FBSDID("$FreeBSD: head/lib/libc/amd64/gen/_setjmp.S 115745 2003-06-02 22:37:53Z peter $");
42
43/*
44 * C library -- _setjmp, _longjmp
45 *
46 *	_longjmp(a,v)
47 * will generate a "return(v)" from the last call to
48 *	_setjmp(a)
49 * by restoring registers from the environment 'a'.
50 * The previous signal state is NOT restored.
51 */
52
53ENTRY(_setjmp)
54	movq	%rdi,%rax
55	movq	0(%rsp),%rdx		/* retval */
56	movq	%rdx, 0(%rax)		/* 0; retval */
57	movq	%rbx, 8(%rax)		/* 1; rbx */
58	movq	%rsp,16(%rax)		/* 2; rsp */
59	movq	%rbp,24(%rax)		/* 3; rbp */
60	movq	%r12,32(%rax)		/* 4; r12 */
61	movq	%r13,40(%rax)		/* 5; r13 */
62	movq	%r14,48(%rax)		/* 6; r14 */
63	movq	%r15,56(%rax)		/* 7; r15 */
64	fnstcw	64(%rax)		/* 8; fpu cw */
65	xorq	%rax,%rax
66	ret
67
68	.weak	CNAME(_longjmp)
69	.set	CNAME(_longjmp),CNAME(___longjmp)
70ENTRY(___longjmp)
71	movq	%rdi,%rdx
72	movq	%rsi,%rax		/* retval */
73	movq	0(%rdx),%rcx
74	movq	8(%rdx),%rbx
75	movq	16(%rdx),%rsp
76	movq	24(%rdx),%rbp
77	movq	32(%rdx),%r12
78	movq	40(%rdx),%r13
79	movq	48(%rdx),%r14
80	movq	56(%rdx),%r15
81	fninit
82	fldcw	64(%rdx)
83	testq	%rax,%rax
84	jnz	1f
85	incq	%rax
861:	movq	%rcx,0(%rsp)
87	ret
88