--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libgcc/config/lm32/_mulsi3.c	Fri Feb 12 23:39:51 2010 +0900
@@ -0,0 +1,48 @@
+/* _mulsi3 for Lattice Mico32.
+   Contributed by Jon Beniston <jon@beniston.com> 
+   
+   Copyright (C) 2009 Free Software Foundation, Inc.
+
+   This file is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by the
+   Free Software Foundation; either version 3, or (at your option) any
+   later version.
+   
+   This file 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
+   General Public License for more details.
+   
+   Under Section 7 of GPL version 3, you are granted additional
+   permissions described in the GCC Runtime Library Exception, version
+   3.1, as published by the Free Software Foundation.
+   
+   You should have received a copy of the GNU General Public License and
+   a copy of the GCC Runtime Library Exception along with this program;
+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+   <http://www.gnu.org/licenses/>. */
+
+#include "libgcc_lm32.h"
+
+/* Integer multiplication.  */
+
+USItype
+__mulsi3 (USItype a, USItype b)
+{
+  USItype result;
+
+  result = 0;
+
+  if (a == 0)
+    return 0;
+
+  while (b != 0)
+    {
+      if (b & 1)
+	result += a;
+      a <<= 1;
+      b >>= 1;
+    }
+
+  return result;
+}