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