1 files changed, 86 insertions, 0 deletions
diff --git a/libstdc++/config/cpu/mips/atomicity.h b/libstdc++/config/cpu/mips/atomicity.h
new file mode 100644
index 0000000..2989fa4
--- /dev/null
+++ b/libstdc++/config/cpu/mips/atomicity.h
@@ -0,0 +1,86 @@
+// Low-level functions for atomic operations: MIPS version  -*- C++ -*-
+
+// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006
+// 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 2, 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.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING.  If not, write to the Free
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+// USA.
+
+// As a special exception, you may use this file as part of a free software
+// library without restriction.  Specifically, if other files instantiate
+// templates or use macros or inline functions from this file, or you compile
+// this file and link it with other files to produce an executable, this
+// file does not by itself cause the resulting executable to be covered by
+// the GNU General Public License.  This exception does not however
+// invalidate any other reasons why the executable file might be covered by
+// the GNU General Public License.
+
+#include <ext/atomicity.h>
+
+_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
+
+  // NB: MIPS II or above required.
+  _Atomic_word
+  __attribute__ ((__unused__))
+  __exchange_and_add(volatile _Atomic_word* __mem, int __val)
+  {
+    _Atomic_word __result, __tmp;
+    
+    __asm__ __volatile__
+      ("/* Inline exchange & add */\n\t"
+       "1:\n\t"
+       ".set	push\n\t"
+#if _MIPS_SIM == _ABIO32
+       ".set	mips2\n\t"
+#endif
+       "ll	%0,0(%2)\n\t"
+       "addu	%1,%3,%0\n\t"
+       "sc	%1,0(%2)\n\t"
+       ".set	pop\n\t"
+       "beqz	%1,1b\n\t"
+       "/* End exchange & add */"
+       : "=&r"(__result), "=&r"(__tmp)
+       : "r"(__mem), "r"(__val)
+       :  "memory" );
+    
+    return __result;
+  }
+  
+  void
+  __attribute__ ((__unused__))
+  __atomic_add(volatile _Atomic_word* __mem, int __val)
+  {
+    _Atomic_word __result;
+    
+    __asm__ __volatile__
+      ("/* Inline atomic add */\n\t"
+       "1:\n\t"
+       ".set	push\n\t"
+#if _MIPS_SIM == _ABIO32
+       ".set	mips2\n\t"
+#endif
+       "ll	%0,0(%1)\n\t"
+       "addu	%0,%2,%0\n\t"
+       "sc	%0,0(%1)\n\t"
+       ".set	pop\n\t"
+       "beqz	%0,1b\n\t"
+       "/* End atomic add */"
+       : "=&r"(__result)
+       : "r"(__mem), "r"(__val)
+       : "memory" );
+  }
+
+_GLIBCXX_END_NAMESPACE