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/*
* libc/sysdeps/linux/nios2/vfork.S -- `vfork' syscall for linux/nios2
*
* 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>
#ifndef __NR_vfork
#define __NR_vfork __NR_fork /* uClinux-2.0 only has fork which is vfork */
#endif
.text
.balign 4
.globl errno
.globl vfork
.globl __libc_vfork
#if defined __HAVE_ELF__
.type vfork,@function
.type __libc_vfork,@function
#endif
vfork:
__libc_vfork:
movui r2, TRAP_ID_SYSCALL
movui r3, __NR_vfork
trap
movi r8, -4096
bltu r8, r2, fix_errno
ret
fix_errno:
sub r8, r0, r2
addi sp, sp, -8
stw ra, 4(sp)
stw r8, 0(sp)
#ifndef __PIC__
call __errno_location
#else
#endif
ldw ra, 4(sp)
ldw r8, 0(sp)
stw r8, 0(r2)
addi r2, r0, -1
addi sp, sp, 8
ret
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