1*404b540aSrobert // Low-level functions for atomic operations: PA-RISC version -*- C++ -*- 2*404b540aSrobert 3*404b540aSrobert // Copyright (C) 2002, 2004, 2005 Free Software Foundation, Inc. 4*404b540aSrobert // 5*404b540aSrobert // This file is part of the GNU ISO C++ Library. This library is free 6*404b540aSrobert // software; you can redistribute it and/or modify it under the 7*404b540aSrobert // terms of the GNU General Public License as published by the 8*404b540aSrobert // Free Software Foundation; either version 2, or (at your option) 9*404b540aSrobert // any later version. 10*404b540aSrobert 11*404b540aSrobert // This library is distributed in the hope that it will be useful, 12*404b540aSrobert // but WITHOUT ANY WARRANTY; without even the implied warranty of 13*404b540aSrobert // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14*404b540aSrobert // GNU General Public License for more details. 15*404b540aSrobert 16*404b540aSrobert // You should have received a copy of the GNU General Public License along 17*404b540aSrobert // with this library; see the file COPYING. If not, write to the Free 18*404b540aSrobert // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 19*404b540aSrobert // USA. 20*404b540aSrobert 21*404b540aSrobert // As a special exception, you may use this file as part of a free software 22*404b540aSrobert // library without restriction. Specifically, if other files instantiate 23*404b540aSrobert // templates or use macros or inline functions from this file, or you compile 24*404b540aSrobert // this file and link it with other files to produce an executable, this 25*404b540aSrobert // file does not by itself cause the resulting executable to be covered by 26*404b540aSrobert // the GNU General Public License. This exception does not however 27*404b540aSrobert // invalidate any other reasons why the executable file might be covered by 28*404b540aSrobert // the GNU General Public License. 29*404b540aSrobert 30*404b540aSrobert #include <bits/c++config.h> 31*404b540aSrobert #include <ext/atomicity.h> 32*404b540aSrobert 33*404b540aSrobert _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) 34*404b540aSrobert 35*404b540aSrobert template<int _Inst> 36*404b540aSrobert struct _Atomicity_lock 37*404b540aSrobert { 38*404b540aSrobert static volatile int _S_atomicity_lock; 39*404b540aSrobert }; 40*404b540aSrobert 41*404b540aSrobert template<int _Inst> 42*404b540aSrobert volatile int 43*404b540aSrobert _Atomicity_lock<_Inst>::_S_atomicity_lock __attribute__ ((aligned (16))) = 1; 44*404b540aSrobert 45*404b540aSrobert // Because of the lack of weak support when using the hpux som 46*404b540aSrobert // linker, we explicitly instantiate the atomicity lock. 47*404b540aSrobert template volatile int _Atomicity_lock<0>::_S_atomicity_lock; 48*404b540aSrobert 49*404b540aSrobert int 50*404b540aSrobert __attribute__ ((__unused__)) __exchange_and_add(volatile _Atomic_word * __mem,int __val)51*404b540aSrobert __exchange_and_add(volatile _Atomic_word* __mem, int __val) 52*404b540aSrobert { 53*404b540aSrobert _Atomic_word result; 54*404b540aSrobert int tmp; 55*404b540aSrobert volatile int& lock = _Atomicity_lock<0>::_S_atomicity_lock; 56*404b540aSrobert 57*404b540aSrobert __asm__ __volatile__ ("ldcw 0(%1),%0\n\t" 58*404b540aSrobert "cmpib,<>,n 0,%0,.+20\n\t" 59*404b540aSrobert "ldw 0(%1),%0\n\t" 60*404b540aSrobert "cmpib,= 0,%0,.-4\n\t" 61*404b540aSrobert "nop\n\t" 62*404b540aSrobert "b,n .-20" 63*404b540aSrobert : "=&r" (tmp) 64*404b540aSrobert : "r" (&lock) 65*404b540aSrobert : "memory"); 66*404b540aSrobert 67*404b540aSrobert result = *__mem; 68*404b540aSrobert *__mem = result + __val; 69*404b540aSrobert __asm__ __volatile__ ("stw %1,0(%0)" 70*404b540aSrobert : : "r" (&lock), "r" (tmp) : "memory"); 71*404b540aSrobert return result; 72*404b540aSrobert } 73*404b540aSrobert 74*404b540aSrobert void 75*404b540aSrobert __attribute__ ((__unused__)) __atomic_add(volatile _Atomic_word * __mem,int __val)76*404b540aSrobert __atomic_add(volatile _Atomic_word* __mem, int __val) 77*404b540aSrobert { 78*404b540aSrobert int tmp; 79*404b540aSrobert volatile int& lock = _Atomicity_lock<0>::_S_atomicity_lock; 80*404b540aSrobert 81*404b540aSrobert __asm__ __volatile__ ("ldcw 0(%1),%0\n\t" 82*404b540aSrobert "cmpib,<>,n 0,%0,.+20\n\t" 83*404b540aSrobert "ldw 0(%1),%0\n\t" 84*404b540aSrobert "cmpib,= 0,%0,.-4\n\t" 85*404b540aSrobert "nop\n\t" 86*404b540aSrobert "b,n .-20" 87*404b540aSrobert : "=&r" (tmp) 88*404b540aSrobert : "r" (&lock) 89*404b540aSrobert : "memory"); 90*404b540aSrobert 91*404b540aSrobert *__mem += __val; 92*404b540aSrobert __asm__ __volatile__ ("stw %1,0(%0)" 93*404b540aSrobert : : "r" (&lock), "r" (tmp) : "memory"); 94*404b540aSrobert } 95*404b540aSrobert 96*404b540aSrobert _GLIBCXX_END_NAMESPACE 97