Implementation of fork syscall for ARM.

1 files changed, 33 insertions, 0 deletions

diff --git a/sysdeps/unix/arm/fork.S b/sysdeps/unix/arm/fork.S
new file mode 100644
index 0000000000..baa33e31b7
--- /dev/null
+++ b/sysdeps/unix/arm/fork.S
@@ -0,0 +1,33 @@
+/* Copyright (C) 1991, 1992, 1994, 1995, 1997 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <sysdep.h>
+
+/* ARM version.  */
+
+SYSCALL__ (fork, 0)
+	/* R1 is now 0 for the parent and 1 for the child.  Decrement it to
+	   make it -1 (all bits set) for the parent, and 0 (no bits set)
+	   for the child.  Then AND it with R0, so the parent gets
+	   R0&-1==R0, and the child gets R0&0==0.  */
+	sub r1, r1, $1
+	and r0, r0, r1
+	RETINSTR(mov, pc, r14)
+PSEUDO_END(fork)
+
+weak_alias (__fork, fork)