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
|
#include <features.h>
#define _ERRNO_H
#include <bits/errno.h>
#include <asm/unistd.h>
#define _SIGNAL_H
#include <bits/signum.h>
#define CLONE_VM 0x00000100 /* set if VM shared between processes */
#define CLONE_VFORK 0x00004000 /* set if the parent wants the child to */
.text
.global __vfork
.hidden __vfork
.type __vfork,%function
.align 4
__vfork:
mvi r2, 0
mvi r3, CLONE_VFORK | CLONE_VM | SIGCHLD
mvi r8, __NR_clone
scall
mvi r2, -4096
bgeu r2, r1, 1f
addi sp, sp, -8
sw (sp+4), ra
sw (sp+8), r1
calli __errno_location
lw r2, (sp+8)
lw ra, (sp+4)
sub r2, r0, r2
sw (r1+0), r2
addi sp, sp, 8
mvi r1, -1
1:
ret
.size __vfork,.-__vfork
weak_alias(__vfork,vfork)
libc_hidden_weak(vfork)
|
