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
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
/* Copyright (C) 1999, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
/* clone() is even more special than fork() as it mucks with stacks
and invokes a function in the right context after its all over. */
#include <asm/unistd.h>
#include <sysdep.h>
#define _ERRNO_H 1
#include <bits/errno.h>
/* int clone(int (*fn)(void *arg), void *child_stack, int flags, void *arg); */
.text
.extern __syscall_error
ENTRY(__clone)
/* sanity check arguments. */
tst r4, r4
bf/s 1f
tst r5, r5
bf/s 1f
mov.l .L1, r1
#ifdef SHARED
mov.l r12, @-r15
sts.l pr, @-r15
mov.l .LG, r12
mova .LG, r0
add r0, r12
mova .L1, r0
add r0, r1
jsr @r1
mov #-EINVAL, r4
lds.l @r15+, pr
rts
mov.l @r15+, r12
#else
jmp @r1
mov #-EINVAL, r4
#endif
.align 2
.L1:
.long PLTJMP(C_SYMBOL_NAME(__syscall_error))
1:
/* insert the args onto the new stack */
mov.l r7, @-r5
/* save the function pointer as the 0th element */
mov.l r4, @-r5
/* do the system call */
mov r6, r4
mov #+__NR_clone, r3
trapa #0x12
mov r0, r1
mov #-12, r2
shad r2, r1
not r1, r1 // r1=0 means r0 = -1 to -4095
tst r1, r1 // i.e. error in linux
bf 2f
mov.l .L2, r1
#ifdef SHARED
mov r0, r4
mov.l r12, @-r15
sts.l pr, @-r15
mov.l .LG, r12
mova .LG, r0
add r0, r12
mova .L2, r0
add r0, r1
jsr @r1
nop
lds.l @r15+, pr
rts
mov.l @r15+, r12
#else
jmp @r1
mov r0, r4
#endif
.align 2
.L2:
.long PLTJMP(C_SYMBOL_NAME(__syscall_error))
2:
tst r0, r0
bt 3f
rts
nop
3:
/* thread starts */
mov.l @r15, r1
jsr @r1
mov.l @(4,r15), r4
/* we are done, passing the return value through r0 */
mov.l .L3, r1
#ifdef SHARED
mov.l r12, @-r15
sts.l pr, @-r15
mov r0, r4
mova .LG, r0
mov.l .LG, r12
add r0, r12
mova .L3, r0
add r0, r1
jsr @r1
nop
lds.l @r15+, pr
rts
mov.l @r15+, r12
#else
jmp @r1
mov r0, r4
#endif
.align 2
.LG:
.long _GLOBAL_OFFSET_TABLE_
.L3:
.long PLTJMP(C_SYMBOL_NAME(_exit))
END(__clone)
.globl clone;
clone = __clone
|
