1  // Low-level functions for atomic operations: CRIS version  -*- C++ -*-
       2  
       3  // Copyright (C) 2001-2023 Free Software Foundation, Inc.
       4  //
       5  // This file is part of the GNU ISO C++ Library.  This library is free
       6  // software; you can redistribute it and/or modify it under the
       7  // terms of the GNU General Public License as published by the
       8  // Free Software Foundation; either version 3, or (at your option)
       9  // any later version.
      10  
      11  // This library is distributed in the hope that it will be useful,
      12  // but WITHOUT ANY WARRANTY; without even the implied warranty of
      13  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14  // GNU General Public License for more details.
      15  
      16  // Under Section 7 of GPL version 3, you are granted additional
      17  // permissions described in the GCC Runtime Library Exception, version
      18  // 3.1, as published by the Free Software Foundation.
      19  
      20  // You should have received a copy of the GNU General Public License and
      21  // a copy of the GCC Runtime Library Exception along with this program;
      22  // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
      23  // <http://www.gnu.org/licenses/>.
      24  
      25  #include <ext/atomicity.h>
      26  
      27  namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
      28  {
      29  _GLIBCXX_BEGIN_NAMESPACE_VERSION
      30  
      31    _Atomic_word
      32    __exchange_and_add(volatile _Atomic_word* __mem, int __val) throw ()
      33    {
      34      int __tmp;
      35      _Atomic_word __result;
      36  
      37  #if (__CRIS_arch_version >= 32)
      38    __asm__ __volatile__ (" clearf p	       \n"
      39  		       "0:		       \n"
      40  		       " move.d %4,%2	       \n"
      41  		       " move.d [%3],%0	       \n"
      42  		       " add.d %0,%2	       \n"
      43  		       " ax		       \n"
      44  		       " move.d %2,[%3]	       \n"
      45  		       " bcs 0b		       \n"
      46  		       " clearf p	       \n"
      47  		       :  "=&r" (__result), "=Q" (*__mem), "=&r" (__tmp)
      48  		       : "r" (__mem), "g" (__val), "Q" (*__mem)
      49  		       : "memory");
      50  #elif (__CRIS_arch_version >= 10)
      51      __asm__ __volatile__ (" clearf		\n"
      52  			"0:			\n"
      53  			" move.d %4,%2		\n"
      54  			" move.d [%3],%0	\n"
      55  			" add.d %0,%2		\n"
      56  			" ax			\n"
      57  			" move.d %2,[%3]	\n"
      58  			" bwf 0b		\n"
      59  			" clearf		\n"
      60  			:  "=&r" (__result), "=Q" (*__mem), "=&r" (__tmp)
      61  			: "r" (__mem), "g" (__val), "Q" (*__mem)
      62  			/* The memory clobber must stay, regardless of
      63  			   current uses of this function.  */
      64  			: "memory");
      65  #else
      66      __asm__ __volatile__ (" move $ccr,$r9	\n"
      67  			" di			\n"
      68  			" move.d %4,%2		\n"
      69  			" move.d [%3],%0	\n"
      70  			" add.d %0,%2		\n"
      71  			" move.d %2,[%3]	\n"
      72  			" move $r9,$ccr		\n"
      73  			:  "=&r" (__result), "=Q" (*__mem), "=&r" (__tmp)
      74  			: "r" (__mem), "g" (__val), "Q" (*__mem)
      75  			: "r9",
      76  			  /* The memory clobber must stay, regardless of
      77  			     current uses of this function.  */
      78  			  "memory");
      79  #endif
      80  
      81      return __result;
      82    }
      83  
      84    void
      85    __atomic_add(volatile _Atomic_word* __mem, int __val) throw ()
      86    { __exchange_and_add(__mem, __val); }
      87  
      88  _GLIBCXX_END_NAMESPACE_VERSION
      89  } // namespace