__bionic_clone.S revision 851e68a2402fa414544e66650e09dfdaac813e51 
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/errno.h>
31#include <linux/sched.h>
32
33// pid_t __bionic_clone(int flags, void* child_stack, pid_t* parent_tid, void* tls, pid_t* child_tid, int (*fn)(void*), void* arg);
34ENTRY(__bionic_clone)
35        .set	noreorder
36        .cpload t9
37        .set	reorder
38
39	# set up child stack
40	subu	a1,16
41	lw	t0,20(sp)     # fn
42	lw	t1,24(sp)     # arg
43	sw	t0,0(a1)	# fn
44	sw	t1,4(a1)	# arg
45
46	# remainder of arguments are correct for clone system call
47        li	v0,__NR_clone
48        syscall
49
50        bnez	a3,.L__error_bc
51
52        beqz	v0,.L__thread_start_bc
53
54        j ra
55
56.L__thread_start_bc:
57        lw	a0,0(sp)	#  fn
58        lw	a1,4(sp)	#  arg
59
60	# void __bionic_clone_entry(int (*func)(void*), void *arg)
61        la	t9,__bionic_clone_entry
62        j	t9
63
64.L__error_bc:
65	move	a0,v0
66	la	t9,__set_errno
67	j	t9
68END(__bionic_clone)
69