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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 32 namespace __gnu_cxx 33 { 34 _Atomic_word 35 __attribute__ ((__unused__)) __exchange_and_add(volatile _Atomic_word * __mem,int __val)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,%3\n\t" 48 "addu %1,%4,%0\n\t" 49 "sc %1,%2\n\t" 50 ".set pop\n\t" 51 "beqz %1,1b\n\t" 52 "/* End exchange & add */" 53 : "=&r"(__result), "=&r"(__tmp), "=m"(*__mem) 54 : "m" (*__mem), "r"(__val)); 55 56 return __result; 57 } 58 59 void 60 __attribute__ ((__unused__)) __atomic_add(volatile _Atomic_word * __mem,int __val)61 __atomic_add(volatile _Atomic_word* __mem, int __val) 62 { 63 _Atomic_word __result; 64 65 __asm__ __volatile__ 66 ("/* Inline atomic add */\n\t" 67 "1:\n\t" 68 ".set push\n\t" 69 #if _MIPS_SIM == _ABIO32 70 ".set mips2\n\t" 71 #endif 72 "ll %0,%2\n\t" 73 "addu %0,%3,%0\n\t" 74 "sc %0,%1\n\t" 75 ".set pop\n\t" 76 "beqz %0,1b\n\t" 77 "/* End atomic add */" 78 : "=&r"(__result), "=m"(*__mem) 79 : "m" (*__mem), "r"(__val)); 80 } 81 } // namespace __gnu_cxx 82