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/* Low-level functions for atomic operations. Sparc32+v9 version.
Copyright (C) 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#ifndef _ATOMICITY_H
#define _ATOMICITY_H 1
#include <inttypes.h>
static inline int
__attribute__ ((unused))
exchange_and_add (volatile uint32_t *mem, int val)
{
uint32_t tmp1, tmp2;
__asm__ __volatile__("1: lduw [%2], %0\n\t"
" add %0, %3, %1\n\t"
" cas [%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 uint32_t *mem, int val)
{
uint32_t tmp1, tmp2;
__asm__ __volatile__("1: lduw [%2], %0\n\t"
" add %0, %3, %1\n\t"
" cas [%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");
}
static inline int
__attribute__ ((unused))
compare_and_swap (volatile long int *p, long int oldval, long int newval)
{
register long int tmp, tmp2;
__asm__ __volatile__("1: lduw [%4], %0\n\t"
" mov %2, %1\n\t"
" cmp %0, %3\n\t"
" bne,a,pn %%xcc, 2f\n\t"
" mov 0, %0\n\t"
" cas [%4], %0, %1\n\t"
" sub %0, %1, %0\n\t"
" brnz,pn %0, 1b\n\t"
" mov 1, %0\n\t"
"2:"
: "=&r" (tmp), "=&r" (tmp2)
: "r" (newval), "r" (oldval), "r" (p)
: "memory");
return tmp;
}
#endif /* atomicity.h */
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