a29456b524
2001-02-27 Benjamin Kosnik <bkoz@redhat.com> Correct license. * config/cpu/alpha/bits/atomicity.h: Change. * config/cpu/arm/bits/atomicity.h * config/cpu/generic/bits/atomicity.h * config/cpu/i386/bits/atomicity.h * config/cpu/i486/bits/atomicity.h * config/cpu/ia64/bits/atomicity.h * config/cpu/powerpc/bits/atomicity.h * config/cpu/sparc/sparc32/bits/atomicity.h * config/cpu/sparc/sparc64/bits/atomicity.h * config/os/aix/bits/atomicity.h * config/os/irix/bits/atomicity.h From-SVN: r40103
135 lines
3.6 KiB
C++
135 lines
3.6 KiB
C++
// Low-level functions for atomic operations: PowerPC version -*- C++ -*-
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// Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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#ifndef _BITS_ATOMICITY_H
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#define _BITS_ATOMICITY_H 1
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typedef int _Atomic_word;
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static inline _Atomic_word
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__attribute__ ((__unused__))
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__exchange_and_add (volatile _Atomic_word* __mem, int __val)
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{
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_Atomic_word __tmp, __res;
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__asm__ __volatile__ (
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"/* Inline exchange & add */\n"
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"0:\t"
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"lwarx %0,0,%2 \n\t"
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"add%I3 %1,%0,%3 \n\t"
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"stwcx. %1,0,%2 \n\t"
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"bne- 0b \n\t"
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"/* End exchange & add */"
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: "=&b"(__res), "=&r"(__tmp)
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: "r" (__mem), "Ir"(__val)
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: "cr0", "memory");
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return __res;
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}
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static inline void
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__attribute__ ((__unused__))
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__atomic_add (volatile _Atomic_word *__mem, int __val)
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{
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_Atomic_word __tmp;
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__asm__ __volatile__ (
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"/* Inline atomic add */\n"
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"0:\t"
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"lwarx %0,0,%1 \n\t"
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"add%I2 %0,%0,%2 \n\t"
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"stwcx. %0,0,%1 \n\t"
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"bne- 0b \n\t"
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"/* End atomic add */"
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: "=&b"(__tmp)
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: "r" (__mem), "Ir"(__val)
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: "cr0", "memory");
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}
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static inline int
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__attribute__ ((__unused__))
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__compare_and_swap (volatile long *__p, long int __oldval, long int __newval)
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{
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int __res;
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__asm__ __volatile__ (
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"/* Inline compare & swap */\n"
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"0:\t"
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"lwarx %0,0,%1 \n\t"
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"sub%I2c. %0,%0,%2 \n\t"
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"cntlzw %0,%0 \n\t"
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"bne- 1f \n\t"
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"stwcx. %3,0,%1 \n\t"
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"bne- 0b \n"
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"1:\n\t"
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"/* End compare & swap */"
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: "=&b"(__res)
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: "r"(__p), "Ir"(__oldval), "r"(__newval)
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: "cr0", "memory");
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return __res >> 5;
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}
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static inline long
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__attribute__ ((__unused__))
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__always_swap (volatile long *__p, long int __newval)
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{
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long __res;
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__asm__ __volatile__ (
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"/* Inline always swap */\n"
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"0:\t"
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"lwarx %0,0,%1 \n\t"
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"stwcx. %2,0,%1 \n\t"
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"bne- 0b \n\t"
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"/* End always swap */"
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: "=&r"(__res)
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: "r"(__p), "r"(__newval)
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: "cr0", "memory");
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return __res;
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}
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static inline int
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__attribute__ ((__unused__))
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__test_and_set (volatile long *__p, long int __newval)
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{
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int __res;
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__asm__ __volatile__ (
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"/* Inline test & set */\n"
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"0:\t"
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"lwarx %0,0,%1 \n\t"
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"cmpwi %0,0 \n\t"
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"bne- 1f \n\t"
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"stwcx. %2,0,%1 \n\t"
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"bne- 0b \n"
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"1:\n\t"
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"/* End test & set */"
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: "=&r"(__res)
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: "r"(__p), "r"(__newval)
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: "cr0", "memory");
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return __res;
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}
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#endif /* atomicity.h */
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