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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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