1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <private/bionic_asm.h>
30#include <linux/sched.h>
31
32// TODO: mips' uapi signal.h is missing #ifndef __ASSEMBLY__.
33// #include <asm/signal.h>
34#define SIGCHLD 18
35
36ENTRY(vfork)
37__BIONIC_WEAK_ASM_FOR_NATIVE_BRIDGE(vfork)
38	.set	noreorder
39	.cpload	$t9
40
41	// __get_tls()[TLS_SLOT_THREAD_ID]->cached_pid_ = 0
42	.set	push
43	.set	mips32r2
44	rdhwr	$v0, $29			// v0 = tls; kernel trap on mips32r1
45	.set	pop
46	lw	$v0, REGSZ*1($v0)		// v0 = v0[TLS_SLOT_THREAD_ID ie 1]
47	sw	$0, REGSZ*2+4($v0)	// v0->cached_pid_ = 0
48
49	li	$a0, (CLONE_VM | CLONE_VFORK | SIGCHLD)
50	li	$a1, 0
51	li	$a2, 0
52	li	$a3, 0
53	subu	$sp, 8
54	sw	$0, 16($sp)
55	li	$v0, __NR_clone
56	syscall
57	addu	$sp, 8
58	bnez	$a3, 1f
59	 move	$a0, $v0
60
61	j	$ra
62	 nop
631:
64	la	$t9, __set_errno_internal
65	j	$t9
66	 nop
67END(vfork)
68