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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
*/
#include <sys/syscall.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. */
.globl __vfork
.hidden __vfork
.align 4
__vfork:
addi r12, r0, SYS_vfork
brki r14, 0x08;
addi r4, r3, 125 /* minimum err value */
blti r4, 1f /* is r3 < -125? */
bri 2f /* normal return */
1: sub r3, r3, r0 /* r3 = -r3 */
#ifdef __PIC__
mfs r3,rpc
addik r3,r3,_GLOBAL_OFFSET_TABLE_+8
lwi r3,r3,C_SYMBOL_NAME(errno)@GOT
sw r3, r0, r3
#else
swi r3, r0, C_SYMBOL_NAME(errno);
#endif
/* state restore etc */
2: rtsd r15, 8 /* error return */
nop
.size __vfork, .-__vfork
weak_alias(__vfork,vfork)
libc_hidden_def(vfork)
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