1 files changed, 29 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/arc/vfork.S b/libc/sysdeps/linux/arc/vfork.S
new file mode 100644
index 000000000..542239fb8
--- /dev/null
+++ b/libc/sysdeps/linux/arc/vfork.S
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sys/syscall.h>
+#include <sysdep.h>
+
+/* No legacy syscall ABI means NR_vfork is not available at all, use clone */
+#define _SIGNAL_H
+#include <bits/signum.h>       /* For SIGCHLD */
+
+#define CLONE_VM		0x00000100
+#define CLONE_VFORK		0x00004000
+#define CLONE_FLAGS_FOR_VFORK	(CLONE_VM|CLONE_VFORK|SIGCHLD)
+
+ENTRY(vfork)
+	mov	r0, CLONE_FLAGS_FOR_VFORK
+	mov_s	r1, sp
+	mov	r8, __NR_clone
+	ARC_TRAP_INSN
+
+	cmp	r0, 0
+	jge	[blink]	; pid >=0 return, else detour via tailcall to errno
+
+	b   __syscall_error
+END(vfork)
+libc_hidden_def(vfork)