xref: /titanic_41/usr/src/lib/libc/amd64/sys/forkx.s (revision 97cc145da041e216ed7f1da0e02b877050900e88)
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#pragma ident	"%Z%%M%	%I%	%E% SMI"
28
29	.file	"%M%"
30
31#include "SYS.h"
32
33/*
34 * pid = __forkx(flags);
35 *
36 * syscall trap: forksys(0, flags)
37 *
38 * From the syscall:
39 * %edx == 0 in parent process, %edx = 1 in child process.
40 * %eax == pid of child in parent, %eax == pid of parent in child.
41 *
42 * The child gets a zero return value.
43 * The parent gets the pid of the child.
44 */
45
46	ENTRY(__forkx)
47	movl	%edi, %esi
48	xorl	%edi, %edi
49	SYSTRAP_2RVALS(forksys)
50	SYSCERROR
51	testl	%edx, %edx
52	jz	1f		/* jump if parent */
53	xorl	%eax, %eax	/* child, return (0) */
541:
55	RET
56	SET_SIZE(__forkx)
57