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/*
* arch/arm/vfork.S
*
* vfork - nasty system call which must not use the stack.
*/
#include <klibc/asmmacros.h>
#include <asm/unistd.h>
.type vfork,#function
.globl vfork
#ifndef __thumb__
.balign 4
vfork:
#ifdef __ARM_EABI__
mov r3, r7
mov r7, # __NR_vfork
swi 0
mov r7, r3
#else
swi # __NR_vfork
#endif
cmn r0, #4096
rsbcs r2, r0, #0
ldrcs r3, 1f
mvncs r0, #0
strcs r2, [r3]
BX(lr)
.balign 4
1:
.word errno
#else
.thumb_func
.balign 2
vfork:
mov r3, r7
mov r7, # __NR_vfork
swi 0
mov r7, r3
ldr r1, 2f
cmp r0, r1
bcc 1f
ldr r1, 3f
neg r2, r0
mov r0, #1
str r2, [r1]
neg r0, r0
1:
BX(lr)
.balign 4
2:
.word -4095
3:
.word errno
#endif
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