1 /* $NetBSD: __clone.S,v 1.4 2011/01/25 02:38:15 matt Exp $ */
4 * Copyright (c) 2001 The NetBSD Foundation, Inc.
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Matt Thomas <matt@3am-software.com>
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
32 #include <sys/errno.h>
37 RCSID("$NetBSD: __clone.S,v 1.4 2011/01/25 02:38:15 matt Exp $")
41 WEAK_ALIAS(clone, __clone)
45 * int __clone(int (*fn)(void *), void *stack, int flags, void *arg);
50 * Sanity checks: func and stack may not be NULL.
52 movl 4(%ap),%r2 /* check and save function */
54 tstl 8(%ap) /* check stack */
58 * The system call expects (flags, stack).
60 movl 12(%ap),4(%ap) /* XXX this doesn't work for
61 callg with a RO arglist */
63 SYSTRAP(__clone) /* only %r0/%r1 munged */
65 blbc %r1,8f /* %r1<0>: 0=parent 1=child */
67 /* Call the clone's entry point. */
71 /* Pass return value to _exit(). */
73 calls $1,_C_LABEL(_exit)