1 // Low-level functions for atomic operations: Sparc version -*- C++ -*- 2 3 // Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005 4 // Free Software Foundation, Inc. 5 // 6 // This file is part of the GNU ISO C++ Library. This library is free 7 // software; you can redistribute it and/or modify it under the 8 // terms of the GNU General Public License as published by the 9 // Free Software Foundation; either version 2, or (at your option) 10 // any later version. 11 12 // This library is distributed in the hope that it will be useful, 13 // but WITHOUT ANY WARRANTY; without even the implied warranty of 14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 // GNU General Public License for more details. 16 17 // You should have received a copy of the GNU General Public License along 18 // with this library; see the file COPYING. If not, write to the Free 19 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 20 // USA. 21 22 // As a special exception, you may use this file as part of a free software 23 // library without restriction. Specifically, if other files instantiate 24 // templates or use macros or inline functions from this file, or you compile 25 // this file and link it with other files to produce an executable, this 26 // file does not by itself cause the resulting executable to be covered by 27 // the GNU General Public License. This exception does not however 28 // invalidate any other reasons why the executable file might be covered by 29 // the GNU General Public License. 30 31 #include <ext/atomicity.h> 32 33 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) 34 35 #ifdef __arch64__ 36 _Atomic_word 37 __attribute__ ((__unused__)) 38 __exchange_and_add(volatile _Atomic_word* __mem, int __val) 39 { 40 _Atomic_word __tmp1, __tmp2; 41 _Atomic_word __val_extended = __val; 42 43 __asm__ __volatile__("1: ldx [%3], %0\n\t" 44 " add %0, %4, %1\n\t" 45 " casx [%3], %0, %1\n\t" 46 " sub %0, %1, %0\n\t" 47 " brnz,pn %0, 1b\n\t" 48 " nop" 49 : "=&r" (__tmp1), "=&r" (__tmp2), "=m" (*__mem) 50 : "r" (__mem), "r" (__val_extended), "m" (*__mem)); 51 return __tmp2; 52 } 53 54 void 55 __attribute__ ((__unused__)) 56 __atomic_add(volatile _Atomic_word* __mem, int __val) 57 { 58 _Atomic_word __tmp1, __tmp2; 59 _Atomic_word __val_extended = __val; 60 61 __asm__ __volatile__("1: ldx [%3], %0\n\t" 62 " add %0, %4, %1\n\t" 63 " casx [%3], %0, %1\n\t" 64 " sub %0, %1, %0\n\t" 65 " brnz,pn %0, 1b\n\t" 66 " nop" 67 : "=&r" (__tmp1), "=&r" (__tmp2), "=m" (*__mem) 68 : "r" (__mem), "r" (__val_extended), "m" (*__mem)); 69 } 70 71 #else /* __arch32__ */ 72 73 template<int __inst> 74 struct _Atomicity_lock 75 { 76 static unsigned char _S_atomicity_lock; 77 }; 78 79 template<int __inst> 80 unsigned char _Atomicity_lock<__inst>::_S_atomicity_lock = 0; 81 82 template unsigned char _Atomicity_lock<0>::_S_atomicity_lock; 83 84 _Atomic_word 85 __attribute__ ((__unused__)) 86 __exchange_and_add(volatile _Atomic_word* __mem, int __val) 87 { 88 _Atomic_word __result, __tmp; 89 90 __asm__ __volatile__("1: ldstub [%1], %0\n\t" 91 " cmp %0, 0\n\t" 92 " bne 1b\n\t" 93 " nop" 94 : "=&r" (__tmp) 95 : "r" (&_Atomicity_lock<0>::_S_atomicity_lock) 96 : "memory"); 97 __result = *__mem; 98 *__mem += __val; 99 __asm__ __volatile__("stb %%g0, [%0]" 100 : /* no outputs */ 101 : "r" (&_Atomicity_lock<0>::_S_atomicity_lock) 102 : "memory"); 103 return __result; 104 } 105 106 void 107 __attribute__ ((__unused__)) 108 __atomic_add(volatile _Atomic_word* __mem, int __val) 109 { 110 _Atomic_word __tmp; 111 112 __asm__ __volatile__("1: ldstub [%1], %0\n\t" 113 " cmp %0, 0\n\t" 114 " bne 1b\n\t" 115 " nop" 116 : "=&r" (__tmp) 117 : "r" (&_Atomicity_lock<0>::_S_atomicity_lock) 118 : "memory"); 119 *__mem += __val; 120 __asm__ __volatile__("stb %%g0, [%0]" 121 : /* no outputs */ 122 : "r" (&_Atomicity_lock<0>::_S_atomicity_lock) 123 : "memory"); 124 } 125 #endif /* __arch32__ */ 126 127 _GLIBCXX_END_NAMESPACE 128