1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
/*
* Copyright (C) 2008-2010 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/linux-syscalls.h>
#include <machine/asm.h>
ENTRY(__pthread_clone)
@ insert the args onto the new stack
str r0, [r1, #-4]
str r3, [r1, #-8]
@ do the system call
@ get flags
mov r0, r2
@ new sp is already in r1
#if __ARM_EABI__
stmfd sp!, {r4, r7}
ldr r7, =__NR_clone
swi #0
#else
swi #__NR_clone
#endif
movs r0, r0
#if __ARM_EABI__
ldmnefd sp!, {r4, r7}
#endif
blt __error
bxne lr
@ pick the function arg and call address off the stack and jump
@ to the C __thread_entry function which does some setup and then
@ calls the thread's start function
ldr r0, [sp, #-4]
ldr r1, [sp, #-8]
mov r2, sp @ __thread_entry needs the TLS pointer
b __thread_entry
__error:
mov r0, #-1
bx lr
END(__pthread_clone)
#
# This function is defined as:
#
# pid_t __bionic_clone( int flags, void *child_stack,
# pid_t *pid, void *tls, pid_t *ctid,
# int (*fn)(void *), void* arg );
#
# NOTE: This is not the same signature than the GLibc
# __clone function here !! Placing 'fn' and 'arg'
# at the end of the parameter list makes the
# implementation much simpler.
#
ENTRY(__bionic_clone)
mov ip, sp
.save {r4, r5, r6, r7}
# save registers to parent stack
stmfd sp!, {r4, r5, r6, r7}
# load extra parameters
ldmfd ip, {r4, r5, r6}
# store 'fn' and 'arg' to the child stack
str r5, [r1, #-4]
str r6, [r1, #-8]
# system call
ldr r7, =__NR_clone
swi #0
movs r0, r0
beq 1f
# in parent, reload saved registers
# then either exit or error
#
ldmfd sp!, {r4, r5, r6, r7}
bxne lr
b __set_syscall_errno
1: # in the child - pick arguments
ldr r0, [sp, #-4]
ldr r1, [sp, #-8]
b __bionic_clone_entry
END(__bionic_clone)
|
