Subversion Repositories openrisc_2011-10-31

// 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__

#include <ext/atomicity.h>

_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)

  typedef int _Atomic_word;

  _Atomic_word

  __attribute__ ((__unused__))

  __exchange_and_add (volatile _Atomic_word* __mem, int __val) throw ()

  {

    _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;

  }

  void

  __attribute__ ((__unused__))

  __atomic_add (volatile _Atomic_word* __mem, int __val) throw ()

  {

    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");

  }

_GLIBCXX_END_NAMESPACE

#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) throw ()

  {

    __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) throw ()

  { __exchange_and_add(__mem, __val); }

_GLIBCXX_END_NAMESPACE

#endif /* !__SH4A__ */