1 files changed, 53 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/nios2/vfork.S b/libc/sysdeps/linux/nios2/vfork.S
new file mode 100644
index 000000000..a19a90023
--- /dev/null
+++ b/libc/sysdeps/linux/nios2/vfork.S
@@ -0,0 +1,53 @@
+/*
+ * 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
+