1 // Low-level functions for atomic operations: sh version -*- C++ -*- 2 3 // Copyright (C) 1999-2013 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 #ifdef __SH4A__ 26 27 #include <ext/atomicity.h> 28 29 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) 30 { 31 _GLIBCXX_BEGIN_NAMESPACE_VERSION 32 33 typedef int _Atomic_word; 34 35 _Atomic_word 36 __attribute__ ((__unused__)) 37 __exchange_and_add (volatile _Atomic_word* __mem, int __val) throw () 38 { 39 _Atomic_word __result; 40 41 __asm__ __volatile__ 42 ("0:\n" 43 "\tmovli.l\t@%2,r0\n" 44 "\tmov\tr0,%1\n" 45 "\tadd\t%3,r0\n" 46 "\tmovco.l\tr0,@%2\n" 47 "\tbf\t0b" 48 : "+m" (*__mem), "=&r" (__result) 49 : "r" (__mem), "rI08" (__val) 50 : "r0"); 51 52 return __result; 53 } 54 55 56 void 57 __attribute__ ((__unused__)) 58 __atomic_add (volatile _Atomic_word* __mem, int __val) throw () 59 { 60 asm("0:\n" 61 "\tmovli.l\t@%1,r0\n" 62 "\tadd\t%2,r0\n" 63 "\tmovco.l\tr0,@%1\n" 64 "\tbf\t0b" 65 : "+m" (*__mem) 66 : "r" (__mem), "rI08" (__val) 67 : "r0"); 68 } 69 70 _GLIBCXX_END_NAMESPACE_VERSION 71 } // namespace 72 73 #else /* !__SH4A__ */ 74 75 /* This is generic/atomicity.h */ 76 77 #include <ext/atomicity.h> 78 #include <ext/concurrence.h> 79 80 namespace 81 { 82 __gnu_cxx::__mutex atomic_mutex; 83 } // anonymous namespace 84 85 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) 86 { 87 _GLIBCXX_BEGIN_NAMESPACE_VERSION 88 89 _Atomic_word 90 __attribute__ ((__unused__)) 91 __exchange_and_add(volatile _Atomic_word* __mem, int __val) throw () 92 { 93 __gnu_cxx::__scoped_lock sentry(atomic_mutex); 94 _Atomic_word __result; 95 __result = *__mem; 96 *__mem += __val; 97 return __result; 98 } 99 100 void 101 __attribute__ ((__unused__)) 102 __atomic_add(volatile _Atomic_word* __mem, int __val) throw () 103 { __exchange_and_add(__mem, __val); } 104 105 _GLIBCXX_END_NAMESPACE_VERSION 106 } // namespace 107 108 #endif /* !__SH4A__ */ 109