1// Low-level functions for atomic operations: MIPS version -*- C++ -*- 2 3// Copyright (C) 2001, 2002, 2003, 2004 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 2, 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// You should have received a copy of the GNU General Public License along 17// with this library; see the file COPYING. If not, write to the Free 18// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 19// USA. 20 21// As a special exception, you may use this file as part of a free software 22// library without restriction. Specifically, if other files instantiate 23// templates or use macros or inline functions from this file, or you compile 24// this file and link it with other files to produce an executable, this 25// file does not by itself cause the resulting executable to be covered by 26// the GNU General Public License. This exception does not however 27// invalidate any other reasons why the executable file might be covered by 28// the GNU General Public License. 29 30#include <bits/atomicity.h> 31 32namespace __gnu_cxx 33{ 34 _Atomic_word 35 __attribute__ ((__unused__)) 36 __exchange_and_add(volatile _Atomic_word* __mem, int __val) 37 { 38 _Atomic_word __result, __tmp; 39 40 __asm__ __volatile__ 41 ("/* Inline exchange & add */\n\t" 42 "1:\n\t" 43 ".set push\n\t" 44#if _MIPS_SIM == _ABIO32 45 ".set mips2\n\t" 46#endif 47 "ll %0,0(%2)\n\t" 48 "addu %1,%3,%0\n\t" 49 "sc %1,0(%2)\n\t" 50 ".set pop\n\t" 51 "beqz %1,1b\n\t" 52 "/* End exchange & add */" 53 : "=&r"(__result), "=&r"(__tmp) 54 : "r"(__mem), "r"(__val) 55 : "memory" ); 56 57 return __result; 58 } 59 60 void 61 __attribute__ ((__unused__)) 62 __atomic_add(volatile _Atomic_word* __mem, int __val) 63 { 64 _Atomic_word __result; 65 66 __asm__ __volatile__ 67 ("/* Inline atomic add */\n\t" 68 "1:\n\t" 69 ".set push\n\t" 70#if _MIPS_SIM == _ABIO32 71 ".set mips2\n\t" 72#endif 73 "ll %0,0(%1)\n\t" 74 "addu %0,%2,%0\n\t" 75 "sc %0,0(%1)\n\t" 76 ".set pop\n\t" 77 "beqz %0,1b\n\t" 78 "/* End atomic add */" 79 : "=&r"(__result) 80 : "r"(__mem), "r"(__val) 81 : "memory" ); 82 } 83} // namespace __gnu_cxx 84