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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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