1117397Skan// Low-level functions for atomic operations: Sparc version -*- C++ -*- 2117397Skan 3169691Skan// Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005 4169691Skan// Free Software Foundation, Inc. 5117397Skan// 6117397Skan// This file is part of the GNU ISO C++ Library. This library is free 7117397Skan// software; you can redistribute it and/or modify it under the 8117397Skan// terms of the GNU General Public License as published by the 9117397Skan// Free Software Foundation; either version 2, or (at your option) 10117397Skan// any later version. 11117397Skan 12117397Skan// This library is distributed in the hope that it will be useful, 13117397Skan// but WITHOUT ANY WARRANTY; without even the implied warranty of 14117397Skan// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15117397Skan// GNU General Public License for more details. 16117397Skan 17117397Skan// You should have received a copy of the GNU General Public License along 18117397Skan// with this library; see the file COPYING. If not, write to the Free 19169691Skan// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 20117397Skan// USA. 21117397Skan 22117397Skan// As a special exception, you may use this file as part of a free software 23117397Skan// library without restriction. Specifically, if other files instantiate 24117397Skan// templates or use macros or inline functions from this file, or you compile 25117397Skan// this file and link it with other files to produce an executable, this 26117397Skan// file does not by itself cause the resulting executable to be covered by 27117397Skan// the GNU General Public License. This exception does not however 28117397Skan// invalidate any other reasons why the executable file might be covered by 29117397Skan// the GNU General Public License. 30117397Skan 31169691Skan#include <ext/atomicity.h> 32117397Skan 33169691Skan_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) 34169691Skan 35117397Skan#ifdef __arch64__ 36132720Skan _Atomic_word 37132720Skan __attribute__ ((__unused__)) 38132720Skan __exchange_and_add(volatile _Atomic_word* __mem, int __val) 39132720Skan { 40132720Skan _Atomic_word __tmp1, __tmp2; 41132720Skan _Atomic_word __val_extended = __val; 42117397Skan 43132720Skan __asm__ __volatile__("1: ldx [%3], %0\n\t" 44132720Skan " add %0, %4, %1\n\t" 45132720Skan " casx [%3], %0, %1\n\t" 46132720Skan " sub %0, %1, %0\n\t" 47132720Skan " brnz,pn %0, 1b\n\t" 48132720Skan " nop" 49132720Skan : "=&r" (__tmp1), "=&r" (__tmp2), "=m" (*__mem) 50132720Skan : "r" (__mem), "r" (__val_extended), "m" (*__mem)); 51132720Skan return __tmp2; 52132720Skan } 53132720Skan 54132720Skan void 55132720Skan __attribute__ ((__unused__)) 56132720Skan __atomic_add(volatile _Atomic_word* __mem, int __val) 57132720Skan { 58132720Skan _Atomic_word __tmp1, __tmp2; 59132720Skan _Atomic_word __val_extended = __val; 60132720Skan 61132720Skan __asm__ __volatile__("1: ldx [%3], %0\n\t" 62132720Skan " add %0, %4, %1\n\t" 63132720Skan " casx [%3], %0, %1\n\t" 64132720Skan " sub %0, %1, %0\n\t" 65132720Skan " brnz,pn %0, 1b\n\t" 66132720Skan " nop" 67132720Skan : "=&r" (__tmp1), "=&r" (__tmp2), "=m" (*__mem) 68132720Skan : "r" (__mem), "r" (__val_extended), "m" (*__mem)); 69132720Skan } 70132720Skan 71117397Skan#else /* __arch32__ */ 72117397Skan 73132720Skan template<int __inst> 74132720Skan struct _Atomicity_lock 75132720Skan { 76132720Skan static unsigned char _S_atomicity_lock; 77132720Skan }; 78117397Skan 79132720Skan template<int __inst> 80132720Skan unsigned char _Atomicity_lock<__inst>::_S_atomicity_lock = 0; 81132720Skan 82132720Skan template unsigned char _Atomicity_lock<0>::_S_atomicity_lock; 83132720Skan 84132720Skan _Atomic_word 85132720Skan __attribute__ ((__unused__)) 86132720Skan __exchange_and_add(volatile _Atomic_word* __mem, int __val) 87132720Skan { 88132720Skan _Atomic_word __result, __tmp; 89132720Skan 90132720Skan __asm__ __volatile__("1: ldstub [%1], %0\n\t" 91132720Skan " cmp %0, 0\n\t" 92132720Skan " bne 1b\n\t" 93132720Skan " nop" 94132720Skan : "=&r" (__tmp) 95132720Skan : "r" (&_Atomicity_lock<0>::_S_atomicity_lock) 96132720Skan : "memory"); 97132720Skan __result = *__mem; 98132720Skan *__mem += __val; 99132720Skan __asm__ __volatile__("stb %%g0, [%0]" 100132720Skan : /* no outputs */ 101132720Skan : "r" (&_Atomicity_lock<0>::_S_atomicity_lock) 102132720Skan : "memory"); 103132720Skan return __result; 104132720Skan } 105132720Skan 106132720Skan void 107132720Skan __attribute__ ((__unused__)) 108132720Skan __atomic_add(volatile _Atomic_word* __mem, int __val) 109132720Skan { 110132720Skan _Atomic_word __tmp; 111132720Skan 112132720Skan __asm__ __volatile__("1: ldstub [%1], %0\n\t" 113132720Skan " cmp %0, 0\n\t" 114132720Skan " bne 1b\n\t" 115132720Skan " nop" 116132720Skan : "=&r" (__tmp) 117132720Skan : "r" (&_Atomicity_lock<0>::_S_atomicity_lock) 118132720Skan : "memory"); 119132720Skan *__mem += __val; 120132720Skan __asm__ __volatile__("stb %%g0, [%0]" 121132720Skan : /* no outputs */ 122132720Skan : "r" (&_Atomicity_lock<0>::_S_atomicity_lock) 123132720Skan : "memory"); 124132720Skan } 125117397Skan#endif /* __arch32__ */ 126169691Skan 127169691Skan_GLIBCXX_END_NAMESPACE 128