mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-21 01:40:04 +08:00
e704c6bf37
2000-05-01 Benjamin Kosnik <bkoz@redhat.com> * config/cpu/powerpc/bits/atomicity.h (__exchange_and_add): More fixes. From-SVN: r33606
105 lines
2.6 KiB
C
105 lines
2.6 KiB
C
/* Low-level functions for atomic operations. PowerPC version.
|
|
Copyright (C) 1997, 1998, 1999, 2000 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 _BITS_ATOMICITY_H
|
|
#define _BITS_ATOMICITY_H 1
|
|
|
|
typedef int _Atomic_word;
|
|
|
|
#if BROKEN_PPC_ASM_CR0
|
|
# define __ATOMICITY_INLINE /* nothing */
|
|
#else
|
|
# define __ATOMICITY_INLINE inline
|
|
#endif
|
|
|
|
static __ATOMICITY_INLINE _Atomic_word
|
|
__attribute__ ((unused))
|
|
__exchange_and_add (volatile _Atomic_word* __mem, int __val)
|
|
{
|
|
_Atomic_word __tmp, __res;
|
|
__asm__ ("\
|
|
0: lwarx %0,0,%2
|
|
add%I3 %1,%0,%3
|
|
stwcx. %1,0,%2
|
|
bne- 0b
|
|
" : "=&b"(__res), "=&r"(__tmp) : "r" (__mem), "Ir"(__val) : "cr0", "memory");
|
|
return __res;
|
|
}
|
|
|
|
static __ATOMICITY_INLINE void
|
|
__attribute__ ((unused))
|
|
__atomic_add (volatile _Atomic_word *__mem, int __val)
|
|
{
|
|
_Atomic_word __tmp;
|
|
__asm__ ("\
|
|
0: lwarx %0,0,%1
|
|
add%I2 %0,%0,%2
|
|
stwcx. %0,0,%1
|
|
bne- 0b
|
|
" : "=&b"(__tmp) : "r" (__mem), "Ir"(__val) : "cr0", "memory");
|
|
}
|
|
|
|
static __ATOMICITY_INLINE int
|
|
__attribute__ ((unused))
|
|
__compare_and_swap (volatile long *__p, long int __oldval, long int __newval)
|
|
{
|
|
int __res;
|
|
__asm__ ("\
|
|
0: lwarx %0,0,%1
|
|
sub%I2c. %0,%0,%2
|
|
cntlzw %0,%0
|
|
bne- 1f
|
|
stwcx. %3,0,%1
|
|
bne- 0b
|
|
1:
|
|
" : "=&b"(__res) : "r"(__p), "Ir"(__oldval), "r"(__newval) : "cr0", "memory");
|
|
return __res >> 5;
|
|
}
|
|
|
|
static __ATOMICITY_INLINE long
|
|
__attribute__ ((unused))
|
|
__always_swap (volatile long *__p, long int __newval)
|
|
{
|
|
long __res;
|
|
__asm__ ("\
|
|
0: lwarx %0,0,%1
|
|
stwcx. %2,0,%1
|
|
bne- 0b
|
|
" : "=&r"(__res) : "r"(__p), "r"(__newval) : "cr0", "memory");
|
|
return __res;
|
|
}
|
|
|
|
static __ATOMICITY_INLINE int
|
|
__attribute__ ((unused))
|
|
__test_and_set (volatile long *__p, long int __newval)
|
|
{
|
|
int __res;
|
|
__asm__ ("\
|
|
0: lwarx %0,0,%1
|
|
cmpwi %0,0
|
|
bne- 1f
|
|
stwcx. %2,0,%1
|
|
bne- 0b
|
|
1:
|
|
" : "=&r"(__res) : "r"(__p), "r"(__newval) : "cr0", "memory");
|
|
return __res;
|
|
}
|
|
|
|
#endif /* atomicity.h */
|