mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-26 20:51:11 +00:00
41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
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 Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; 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>
|
|
|
|
#if BROKEN_PPC_ASM_CR0
|
|
# define __ATOMICITY_INLINE /* nothing */
|
|
#else
|
|
# define __ATOMICITY_INLINE inline
|
|
#endif
|
|
|
|
static __ATOMICITY_INLINE int
|
|
__attribute__ ((unused))
|
|
exchange_and_add (volatile uint32_t *mem, int val)
|
|
{
|
|
int tmp, result;
|
|
__asm__ ("\n\
|
|
0: lwarx %0,0,%2 \n\
|
|
add%I3 %1,%0,%3 \n\
|
|
stwcx. %1,0,%2 \n\
|
|
bne- 0b \n\
|
|
" : "=&b"(result), "=&r"(tmp) : "r" (mem), "Ir"(val) : "cr0", "memory");
|
|
return result;
|
|
}
|
|
|
|
static __ATOMICITY_INLINE void
|
|
__attribute__ ((unused))
|
|
atomic_add (volatile uint32_t *mem, int val)
|
|
{
|
|
int tmp;
|
|
__asm__ ("\n\
|
|
0: lwarx %0,0,%1 \n\
|
|
add%I2 %0,%0,%2 \n\
|
|
stwcx. %0,0,%1 \n\
|
|
bne- 0b \n\
|
|
" : "=&b"(tmp) : "r" (mem), "Ir"(val) : "cr0", "memory");
|
|
}
|
|
|
|
static __ATOMICITY_INLINE int
|
|
__attribute__ ((unused))
|
|
compare_and_swap (volatile long int *p, long int oldval, long int newval)
|
|
{
|
|
int result;
|
|
__asm__ ("\n\
|
|
0: lwarx %0,0,%1 \n\
|
|
sub%I2c. %0,%0,%2 \n\
|
|
cntlzw %0,%0 \n\
|
|
bne- 1f \n\
|
|
stwcx. %3,0,%1 \n\
|
|
bne- 0b \n\
|
|
1: \n\
|
|
" : "=&b"(result) : "r"(p), "Ir"(oldval), "r"(newval) : "cr0", "memory");
|
|
return result >> 5;
|
|
}
|
|
|
|
static __ATOMICITY_INLINE long int
|
|
__attribute__ ((unused))
|
|
always_swap (volatile long int *p, long int newval)
|
|
{
|
|
long int result;
|
|
__asm__ ("\n\
|
|
0: lwarx %0,0,%1 \n\
|
|
stwcx. %2,0,%1 \n\
|
|
bne- 0b \n\
|
|
" : "=&r"(result) : "r"(p), "r"(newval) : "cr0", "memory");
|
|
return result;
|
|
}
|
|
|
|
static __ATOMICITY_INLINE int
|
|
__attribute__ ((unused))
|
|
test_and_set (volatile long int *p, long int newval)
|
|
{
|
|
int result;
|
|
__asm__ ("\n\
|
|
0: lwarx %0,0,%1 \n\
|
|
cmpwi %0,0 \n\
|
|
bne- 1f \n\
|
|
stwcx. %2,0,%1 \n\
|
|
bne- 0b \n\
|
|
1: \n\
|
|
" : "=&r"(result) : "r"(p), "r"(newval) : "cr0", "memory");
|
|
return result;
|
|
}
|
|
|
|
#endif /* atomicity.h */
|