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	.set	noreorder
38	.cpload	t9
39
40	// __get_tls()[TLS_SLOT_THREAD_ID]->cached_pid_ = 0
41	.set	push
42	.set	mips32r2
43	rdhwr	v0, $29			// v0 = tls; kernel trap on mips32r1
44	.set	pop
45	lw	v0, REGSZ*1(v0)		// v0 = v0[TLS_SLOT_THREAD_ID ie 1]
46	sw	$0, REGSZ*2+4(v0)	// v0->cached_pid_ = 0
47
48	li	a0, (CLONE_VM | CLONE_VFORK | SIGCHLD)
49	li	a1, 0
50	li	a2, 0
51	li	a3, 0
52	subu	sp, 8
53	sw	$0, 16(sp)
54	li	v0, __NR_clone
55	syscall
56	addu	sp, 8
57	bnez	a3, 1f
58	 move	a0, v0
59
60	j	ra
61	 nop
621:
63	la	t9, __set_errno_internal
64	j	t9
65	 nop
66END(vfork)
67