1 /* $NetBSD: __vfork14.S,v 1.3 2003/08/07 16:42:29 agc Exp $ */
4 * Copyright (c) 1992, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This software was developed by the Computer Systems Engineering group
8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
9 * contributed to Berkeley.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * from: Header: Ovfork.s,v 1.1 91/07/06 13:05:56 torek Exp
38 #include <machine/asm.h>
39 #if defined(SYSLIBC_SCCS) && !defined(lint)
41 .asciz "@(#)Ovfork.s 8.1 (Berkeley) 6/4/93"
43 RCSID("$NetBSD: __vfork14.S,v 1.3 2003/08/07 16:42:29 agc Exp $")
45 #endif /* SYSLIBC_SCCS and not lint */
50 * %o1 == 0 in parent process, 1 in child process.
51 * %o0 == pid of child in parent, pid of parent in child.
57 dec %o1 /* from 1 to 0 in child, 0 to -1 in parent */
59 and %o0, %o1, %o0 /* return 0 in child, pid in parent */