libstdc++-v3/config/cpu/cris/atomicity.h

   1 // Low-level functions for atomic operations: CRIS version  -*- C++ -*-
   2
   3 // Copyright (C) 2001, 2003, 2004, 2005, 2009 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 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
  28
  29   _Atomic_word
  30   __exchange_and_add(volatile _Atomic_word* __mem, int __val)
  31   {
  32     int __tmp;
  33     _Atomic_word __result;
  34
  35 #if (__CRIS_arch_version >= 32)
  36   __asm__ __volatile__ (" clearf p             \n"
  37                        "0:                     \n"
  38                        " move.d %4,%2          \n"
  39                        " move.d [%3],%0        \n"
  40                        " add.d %0,%2           \n"
  41                        " ax                    \n"
  42                        " move.d %2,[%3]        \n"
  43                        " bcs 0b                \n"
  44                        " clearf p              \n"
  45                        :  "=&r" (__result), "=Q" (*__mem), "=&r" (__tmp)
  46                        : "r" (__mem), "g" (__val), "Q" (*__mem)
  47                        : "memory");
  48 #elif (__CRIS_arch_version >= 10)
  49     __asm__ __volatile__ (" clearf              \n"
  50                         "0:                     \n"
  51                         " move.d %4,%2          \n"
  52                         " move.d [%3],%0        \n"
  53                         " add.d %0,%2           \n"
  54                         " ax                    \n"
  55                         " move.d %2,[%3]        \n"
  56                         " bwf 0b                \n"
  57                         " clearf                \n"
  58                         :  "=&r" (__result), "=Q" (*__mem), "=&r" (__tmp)
  59                         : "r" (__mem), "g" (__val), "Q" (*__mem)
  60                         /* The memory clobber must stay, regardless of
  61                            current uses of this function.  */
  62                         : "memory");
  63 #else
  64     __asm__ __volatile__ (" move $ccr,$r9       \n"
  65                         " di                    \n"
  66                         " move.d %4,%2          \n"
  67                         " move.d [%3],%0        \n"
  68                         " add.d %0,%2           \n"
  69                         " move.d %2,[%3]        \n"
  70                         " move $r9,$ccr         \n"
  71                         :  "=&r" (__result), "=Q" (*__mem), "=&r" (__tmp)
  72                         : "r" (__mem), "g" (__val), "Q" (*__mem)
  73                         : "r9",
  74                           /* The memory clobber must stay, regardless of
  75                              current uses of this function.  */
  76                           "memory");
  77 #endif
  78
  79     return __result;
  80   }
  81
  82   void
  83   __atomic_add(volatile _Atomic_word* __mem, int __val)
  84   { __exchange_and_add(__mem, __val); }
  85
  86 _GLIBCXX_END_NAMESPACE