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diff --git a/libstdc++-v3/config/cpu/sh/atomicity.h b/libstdc++-v3/config/cpu/sh/atomicity.h
new file mode 100644
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--- /dev/null
+++ b/libstdc++-v3/config/cpu/sh/atomicity.h
@@ -0,0 +1,102 @@
+// Low-level functions for atomic operations: sh version  -*- C++ -*-
+
+// Copyright (C) 1999, 2001, 2002, 2003, 2004, 2005, 2006, 2009
+// Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library 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 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 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/>.
+
+#ifdef __SH4A__
+
+#ifndef _GLIBCXX_ATOMICITY_H
+#define _GLIBCXX_ATOMICITY_H	1
+
+typedef int _Atomic_word;
+
+static inline _Atomic_word
+__attribute__ ((__unused__))
+__exchange_and_add (volatile _Atomic_word* __mem, int __val)
+{
+  _Atomic_word __result;
+
+  __asm__ __volatile__
+    ("0:\n"
+     "\tmovli.l\t@%2,r0\n"
+     "\tmov\tr0,%1\n"
+     "\tadd\t%3,r0\n"
+     "\tmovco.l\tr0,@%2\n"
+     "\tbf\t0b"
+     : "+m" (*__mem), "=r" (__result)
+     : "r" (__mem), "rI08" (__val)
+     : "r0");
+
+  return __result;
+}
+
+
+static inline void
+__attribute__ ((__unused__))
+__atomic_add (volatile _Atomic_word* __mem, int __val)
+{
+  asm("0:\n"
+      "\tmovli.l\t@%1,r0\n"
+      "\tadd\t%2,r0\n"
+      "\tmovco.l\tr0,@%1\n"
+      "\tbf\t0b"
+      : "+m" (*__mem)
+      : "r" (__mem), "rI08" (__val)
+      : "r0");
+}
+
+#endif
+
+#else /* !__SH4A__ */
+
+/* This is generic/atomicity.h */
+
+#include <ext/atomicity.h>
+#include <ext/concurrence.h>
+
+namespace 
+{
+  __gnu_cxx::__mutex atomic_mutex;
+} // anonymous namespace
+
+_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
+
+  _Atomic_word
+  __attribute__ ((__unused__))
+  __exchange_and_add(volatile _Atomic_word* __mem, int __val)
+  {
+    __gnu_cxx::__scoped_lock sentry(atomic_mutex);
+    _Atomic_word __result;
+    __result = *__mem;
+    *__mem += __val;
+    return __result;
+  }
+
+  void
+  __attribute__ ((__unused__))
+  __atomic_add(volatile _Atomic_word* __mem, int __val)
+  { __exchange_and_add(__mem, __val); }
+
+_GLIBCXX_END_NAMESPACE
+
+#endif /* !__SH4A__ */