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/*
* libc/sysdeps/linux/microblaze/vfork.S -- `vfork' syscall for linux/microblaze
*
* Copyright (C) 2003 John Williams <jwilliams@itee.uq.edu.au>
* Copyright (C) 2001 NEC Corporation
* Copyright (C) 2001 Miles Bader <miles@gnu.org>
*
* 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 Miles Bader <miles@gnu.org>
* Microblaze port by John Williams
*/
#define _ERRNO_H 1
#include <bits/errno.h>
#define _SYSCALL_H
#include <bits/sysnum.h>
#include <clinkage.h>
/* Clone the calling process, but without copying the whole address space.
The calling process is suspended until the new process exits or is
replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
and the process ID of the new process to the old process. */
.global C_SYMBOL_NAME(errno)
C_ENTRY (__vfork):
addi r12, r0, SYS_vfork
bralid r17, 0x08;
nop
addi r4, r3, 125 // minimum err value
blti r4, 1f // is r3 < -125?
rtsd r15, 8 // normal return
nop
1: sub r3, r3, r0 // r3 = -r3
swi r3, r0, C_SYMBOL_NAME(errno);
rtsd r15, 8 // error return
nop
C_END(__vfork)
.weak C_SYMBOL_NAME(vfork)
C_SYMBOL_NAME(vfork) = C_SYMBOL_NAME(__vfork)
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