1/*	$NetBSD: Ovfork.S,v 1.6 2003/08/07 16:42:03 agc Exp $	*/
2
3/*-
4 * Copyright (c) 1990 The Regents of the University of California.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 *	from: @(#)Ovfork.s	5.1 (Berkeley) 4/23/90
32 */
33
34#include <machine/asm.h>
35__FBSDID("$FreeBSD: releng/10.3/lib/libc/arm/sys/Ovfork.S 271337 2014-09-09 22:24:01Z ian $");
36#include "SYS.h"
37
38/*
39 * pid = vfork();
40 *
41 * On return from the SWI:
42 * r1 == 0 in parent process, r1 == 1 in child process.
43 * r0 == pid of child in parent, r0 == pid of parent in child.
44 */
45	.text
46	.align	0
47
48ENTRY(vfork)
49	mov	r2, r14
50	SYSTRAP(vfork)
51	bcs	PIC_SYM(CERROR, PLT)
52	sub	r1, r1, #1	/* r1 == 0xffffffff if parent, 0 if child */
53	and	r0, r0, r1	/* r0 == 0 if child, else unchanged */
54	mov	r15, r2
55END(vfork)
56