Pete Popov writes:

Hi Erik,

I'm not sure why the NIOS support is not in uClibc -- perhaps the patch
was rejected or never submitted? In any case, I'm playing with some NIOS
stuff and created this patch against 0.9.26. The work was done by
Microtronix. I'm not sure who else contributed to it. It would be great
to have the NIOS support available in uClibc so developers don't have to
go searching for these bits.

Pete

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
+