vfork.S revision 115279 
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(SYSLIBC_SCCS) && !defined(lint)
38	.asciz "@(#)Ovfork.s	5.1 (Berkeley) 4/23/90"
39#endif /* SYSLIBC_SCCS and not lint */
40#include <machine/asm.h>
41__FBSDID("$FreeBSD: head/lib/libc/amd64/sys/vfork.S 115279 2003-05-24 17:35:23Z peter $");
42
43#include "SYS.h"
44
45	.weak	_vfork
46	.set	_vfork,__sys_vfork
47	.weak	vfork
48	.set	vfork,__sys_vfork
49ENTRY(__sys_vfork)
50	popq	%rsi		/* fetch return address (%rsi preserved) */
51	mov	$SYS_vfork,%rax
52	KERNCALL
53	jb	1f
54	jmp	*%rsi
551:
56	pushq	%rsi
57#ifdef PIC
58	movq	PIC_GOT(HIDENAME(cerror)),%rdx
59	jmp	*%rdx
60#else
61	jmp     HIDENAME(cerror)
62#endif
63