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
|
/* Copyright (C) 1999, 2000 Free Software Foundation, Inc.
Copyright (C) 2001 Hewlett-Packard Australia
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Library General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your option) any
later version.
This program 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 Library General Public License for more
details.
You should have received a copy of the GNU Library General Public License
along with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Derived in part from the Linux-8086 C library, the GNU C Library, and several
other sundry sources. Files within this library are copyright by their
respective copyright holders.
*/
#include <features.h>
#include <sys/syscall.h>
#define _ERRNO_H
#include <bits/errno.h>
#include <bits/sysnum.h>
/* Clone the calling process, but without copying the whole address space.
The calling process is suspended until the new process exits or is
replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
and the process ID of the new process to the old process. */
.text
.globl __vfork
.hidden __vfork
.type __vfork,@function
.align 4
__vfork:
mov.w .L2, r3
trapa #__SH_SYSCALL_TRAP_BASE
mov r0, r1
#ifdef __CONFIG_SH2__
// 12 arithmetic shifts for the crappy sh2, because shad doesn't exist!
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
#else
mov #-12, r2
shad r2, r1
#endif
not r1, r1 // r1=0 means r0 = -1 to -4095
tst r1, r1 // i.e. error in linux
bf 2f
mov.w .L1, r1
cmp/eq r1, r0
bf/s __syscall_error
mov r0, r4
/* If we don't have vfork, use fork. */
mov.w .L3, r3
trapa #__SH_SYSCALL_TRAP_BASE
mov r0, r1
#ifdef __CONFIG_SH2__
// 12 arithmetic shifts for the crappy sh2, because shad doesn't exist!
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
shar r1
#else
mov #-12, r2
shad r2, r1
#endif
not r1, r1 // r1=0 means r0 = -1 to -4095
tst r1, r1 // i.e. error in linux
bt/s __syscall_error
mov r0, r4
2:
rts
nop
.align 2
.L1:
.word -ENOSYS
.L2:
.word __NR_vfork
.L3:
.word __NR_fork
.size __vfork, .-__vfork
weak_alias(__vfork,vfork)
libc_hidden_weak(vfork)
#include "syscall_error.S"
|
