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/*
* libc/sysdeps/linux/nios/vfork.S -- `vfork' syscall for linux/nios
*
* Copyright (C) 2004 Microtronix Datacom Ltd
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License. See the file COPYING.LIB in the main
* directory of this archive for more details.
*
* Written by Wentao Xu <wentao@microtronix.com>
*/
#include <asm/unistd.h>
#include "NM_Macros.S"
#ifndef __NR_vfork
#define __NR_vfork __NR_fork /* uClinux-2.0 only has fork which is vfork */
#endif
.text
.align 2
.globl errno
.globl vfork
.globl __libc_vfork
#if defined __HAVE_ELF__
.type vfork,@function
.type __libc_vfork,@function
#endif
vfork:
__libc_vfork:
MOVIP %g1, __NR_vfork
trap 63
bgen %g1, 12
not %g1 /* (unsigned long) -4096 */
cmp %o0, %g1
skps cc_hi
jmp %o7
nop
fix_errno:
neg %o0
save %sp, -16
MOVIA %g1, __errno_location@h
call %g1
nop
st [%o0], %i0 /* store errno */
xor %i0, %i0
subi %i0, 1 /* retval=-1 */
ret
restore
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