setjmp.S revision 114829 
113341Sjkh/*-
213341Sjkh * Copyright (c) 1990 The Regents of the University of California.
375328Sobrien * All rights reserved.
475328Sobrien *
575328Sobrien * This code is derived from software contributed to Berkeley by
613341Sjkh * William Jolitz.
713341Sjkh *
813341Sjkh * Redistribution and use in source and binary forms, with or without
913341Sjkh * modification, are permitted provided that the following conditions
1039556Sjkh * are met:
1113341Sjkh * 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 114829 2003-05-08 06:25:03Z 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 restored.
51 */
52
53#include "SYS.h"
54
55ENTRY(setjmp)
56	pushq	%rdi
57	movq	%rdi,%rcx
58	movq	$1,%rdi			/* SIG_BLOCK       */
59	movq	$0,%rsi			/* (sigset_t*)set  */
60	leaq	72(%rcx),%rdx		/* (sigset_t*)oset */
61	call	PIC_PLT(CNAME(_sigprocmask))
62	popq	%rdi
63	movq	%rdi,%rcx
64	movq	0(%rsp),%rdx		/* retval */
65	movq	%rdx, 0(%rcx)		/* retval */
66	movq	%rbx, 8(%rcx)
67	movq	%rsp,16(%rcx)
68	movq	%rbp,24(%rcx)
69	movq	%r12,32(%rcx)
70	movq	%r13,40(%rcx)
71	movq	%r14,48(%rcx)
72	movq	%r15,56(%rcx)
73	fnstcw	64(%rcx)
74	xorq	%rax,%rax
75	ret
76
77	.weak CNAME(longjmp)
78	.set CNAME(longjmp),CNAME(__longjmp)
79ENTRY(__longjmp)
80	pushq	%rdi
81	pushq	%rsi
82	movq	%rdi,%rdx
83	movq	$1,%rdi			/* SIG_SETMASK     */
84	leaq	72(%rdx),%rsi		/* (sigset_t*)set  */
85	movq	$0,%rdx			/* (sigset_t*)oset */
86	call	PIC_PLT(CNAME(_sigprocmask))
87	popq	%rsi
88	popq	%rdi			/* jmpbuf */
89	movq	%rdi,%rdx
90	movq	%rsi,%rax		/* retval */
91	movq	0(%rdx),%rcx
92	movq	8(%rdx),%rbx
93	movq	16(%rdx),%rsp
94	movq	24(%rdx),%rbp
95	movq	32(%rdx),%r12
96	movq	40(%rdx),%r13
97	movq	48(%rdx),%r14
98	movq	56(%rdx),%r15
99	fninit
100	fldcw	64(%rdx)
101	testq	%rax,%rax
102	jnz	1f
103	incq	%rax
1041:	movq	%rcx,0(%rsp)
105	ret
106