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/* vi: set sw=4 ts=4: */
/*
* vfork for uClibc
* Copyright (C) 2000-2006 by Erik Andersen <andersen@uclibc.org>
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
#include <features.h>
#include <bits/arm_asm.h>
#define _ERRNO_H
#include <bits/errno.h>
#include <sys/syscall.h>
#ifndef SAVE_PID
#define SAVE_PID
#endif
#ifndef RESTORE_PID
#define RESTORE_PID
#endif
#ifdef __NR_fork
.text
.global __vfork
.hidden __vfork
.type __vfork,%function
.align 4
#if defined(__thumb__) && !defined(__thumb2__)
.thumb_func
__vfork:
#ifdef __NR_vfork
SAVE_PID
DO_CALL (vfork)
RESTORE_PID
ldr r1, =0xfffff000
cmp r0, r1
bcs 1f
bx lr
1:
/* Check if vfork even exists. */
ldr r1, =-ENOSYS
cmp r0, r1
bne __error
/* If we don't have vfork, use fork. */
DO_CALL (fork)
ldr r1, =0xfffff000
cmp r0, r1
/* Syscall worked. Return to child/parent */
bcs 1f
bx lr
1:
__error:
push {r3, lr}
bl __syscall_error
POP_RET
.pool
#endif
#else
__vfork:
#ifdef __NR_vfork
SAVE_PID
DO_CALL (vfork)
RESTORE_PID
cmn r0, #4096
IT(t, cc)
#if defined(__USE_BX__)
bxcc lr
#else
movcc pc, lr
#endif
/* Check if vfork even exists. */
ldr r1, =-ENOSYS
teq r0, r1
bne __error
#endif
/* If we don't have vfork, use fork. */
DO_CALL (fork)
cmn r0, #4096
/* Syscall worked. Return to child/parent */
IT(t, cc)
#if defined(__USE_BX__)
bxcc lr
#else
movcc pc, lr
#endif
__error:
b __syscall_error
#endif
.size __vfork,.-__vfork
weak_alias(__vfork,vfork)
libc_hidden_weak(vfork)
#endif
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