Imported gcc-4.4.3

[msp430-gcc.git] / libstdc++-v3 / config / cpu / hppa / atomicity.h

diff --git a/libstdc++-v3/config/cpu/hppa/atomicity.h b/libstdc++-v3/config/cpu/hppa/atomicity.h
new file mode 100644 (file)
index 0000000..6a167e9
--- /dev/null
+++ b/libstdc++-v3/config/cpu/hppa/atomicity.h
@@ -0,0 +1,91 @@
+// Low-level functions for atomic operations: PA-RISC version  -*- C++ -*-
+
+// Copyright (C) 2002, 2004, 2005, 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/>.
+
+#include <bits/c++config.h>
+#include <ext/atomicity.h>
+
+_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
+
+  template<int _Inst>
+    struct _Atomicity_lock
+    {
+      static volatile int _S_atomicity_lock;
+    };
+  
+  template<int _Inst>
+  volatile int
+  _Atomicity_lock<_Inst>::_S_atomicity_lock __attribute__ ((aligned (16))) = 1;
+
+  // Because of the lack of weak support when using the hpux som
+  // linker, we explicitly instantiate the atomicity lock.
+  template volatile int _Atomicity_lock<0>::_S_atomicity_lock;
+
+  int
+  __attribute__ ((__unused__))
+  __exchange_and_add(volatile _Atomic_word* __mem, int __val)
+  {
+    _Atomic_word result;
+    int tmp;
+    volatile int& lock = _Atomicity_lock<0>::_S_atomicity_lock;
+    
+    __asm__ __volatile__ ("ldcw 0(%1),%0\n\t"
+                         "cmpib,<>,n 0,%0,.+20\n\t"
+                         "ldw 0(%1),%0\n\t"
+                         "cmpib,= 0,%0,.-4\n\t"
+                         "nop\n\t"
+                         "b,n .-20"
+                         : "=&r" (tmp)
+                         : "r" (&lock)
+                         : "memory");
+    
+    result = *__mem;
+    *__mem = result + __val;
+    __asm__ __volatile__ ("stw %1,0(%0)"
+                         : : "r" (&lock), "r" (tmp) : "memory");
+    return result;
+  }
+  
+  void
+  __attribute__ ((__unused__))
+  __atomic_add(volatile _Atomic_word* __mem, int __val)
+  {
+    int tmp;
+    volatile int& lock = _Atomicity_lock<0>::_S_atomicity_lock;
+    
+    __asm__ __volatile__ ("ldcw 0(%1),%0\n\t"
+                         "cmpib,<>,n 0,%0,.+20\n\t"
+                         "ldw 0(%1),%0\n\t"
+                         "cmpib,= 0,%0,.-4\n\t"
+                         "nop\n\t"
+                         "b,n .-20"
+                         : "=&r" (tmp)
+                         : "r" (&lock)
+                         : "memory");
+    
+    *__mem += __val;
+    __asm__ __volatile__ ("stw %1,0(%0)"
+                         : : "r" (&lock), "r" (tmp) : "memory");
+  }
+
+_GLIBCXX_END_NAMESPACE