1/*	$NetBSD: compat_Ovfork.S,v 1.1 2005/09/17 11:49:39 tsutsui Exp $	*/
2
3/*-
4 * Copyright (c) 1991, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Ralph Campbell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <machine/asm.h>
36__FBSDID("$FreeBSD$");
37#include "SYS.h"
38
39#if defined(LIBC_SCCS) && !defined(lint)
40	ASMSTR("from: @(#)Ovfork.s	8.1 (Berkeley) 6/4/93")
41	ASMSTR("$NetBSD: compat_Ovfork.S,v 1.1 2005/09/17 11:49:39 tsutsui Exp $")
42#endif /* LIBC_SCCS and not lint */
43
44/*
45 * pid = vfork();
46 *
47 * v1 == 0 in parent process, v1 == 1 in child process.
48 * v0 == pid of child in parent, v0 == pid of parent in child.
49 */
50
51LEAF(__sys_vfork)
52	WEAK_ALIAS(vfork, __sys_vfork)
53	WEAK_ALIAS(_vfork, __sys_vfork)
54	PIC_PROLOGUE(__sys_vfork)
55	li	v0, SYS_vfork		# system call number for vfork
56	syscall
57	beq	a3, zero, 1f		# jump if no errors
58	PIC_TAILCALL(__cerror)
591:
60	beq	v1, zero, 2f		# parent process ?
61	move	v0, zero		# return zero in child
622:
63	PIC_RETURN()
64END(__sys_vfork)
65