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// Low-level functions for atomic operations: Sparc version -*- C++ -*-
// Copyright (C) 1999, 2000, 2001, 2002 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
#ifdef __arch64__
typedef long _Atomic_word;
static inline _Atomic_word
__attribute__ ((__unused__))
__exchange_and_add (volatile _Atomic_word *__mem, int __val)
{
_Atomic_word __tmp1, __tmp2;
__asm__ __volatile__("1: ldx [%2], %0\n\t"
" add %0, %3, %1\n\t"
" casx [%2], %0, %1\n\t"
" sub %0, %1, %0\n\t"
" brnz,pn %0, 1b\n\t"
" nop"
: "=&r" (__tmp1), "=&r" (__tmp2)
: "r" (__mem), "r" (__val)
: "memory");
return __tmp2;
}
static inline void
__attribute__ ((__unused__))
__atomic_add (volatile _Atomic_word* __mem, int __val)
{
_Atomic_word __tmp1, __tmp2;
__asm__ __volatile__("1: ldx [%2], %0\n\t"
" add %0, %3, %1\n\t"
" casx [%2], %0, %1\n\t"
" sub %0, %1, %0\n\t"
" brnz,pn %0, 1b\n\t"
" nop"
: "=&r" (__tmp1), "=&r" (__tmp2)
: "r" (__mem), "r" (__val)
: "memory");
}
#else /* __arch32__ */
typedef int _Atomic_word;
template <int __inst>
struct __Atomicity_lock
{
static unsigned char _S_atomicity_lock;
};
template <int __inst>
unsigned char __Atomicity_lock<__inst>::_S_atomicity_lock = 0;
template unsigned char __Atomicity_lock<0>::_S_atomicity_lock;
static int
__attribute__ ((__unused__))
__exchange_and_add (volatile _Atomic_word* __mem, int __val)
{
_Atomic_word __result, __tmp;
__asm__ __volatile__("1: ldstub [%1], %0\n\t"
" cmp %0, 0\n\t"
" bne 1b\n\t"
" nop"
: "=&r" (__tmp)
: "r" (&__Atomicity_lock<0>::_S_atomicity_lock)
: "memory");
__result = *__mem;
*__mem += __val;
__asm__ __volatile__("stb %%g0, [%0]"
: /* no outputs */
: "r" (&__Atomicity_lock<0>::_S_atomicity_lock)
: "memory");
return __result;
}
static void
__attribute__ ((__unused__))
__atomic_add (volatile _Atomic_word* __mem, int __val)
{
_Atomic_word __tmp;
__asm__ __volatile__("1: ldstub [%1], %0\n\t"
" cmp %0, 0\n\t"
" bne 1b\n\t"
" nop"
: "=&r" (__tmp)
: "r" (&__Atomicity_lock<0>::_S_atomicity_lock)
: "memory");
*__mem += __val;
__asm__ __volatile__("stb %%g0, [%0]"
: /* no outputs */
: "r" (&__Atomicity_lock<0>::_S_atomicity_lock)
: "memory");
}
#endif /* __arch32__ */
#endif /* atomicity.h */
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