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.
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Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _ATOMICITY_H
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#define _ATOMICITY_H 1
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#include <inttypes.h>
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#if BROKEN_PPC_ASM_CR0
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# define __ATOMICITY_INLINE /* nothing */
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#else
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# define __ATOMICITY_INLINE inline
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#endif
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static __ATOMICITY_INLINE int
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__attribute__ ((unused))
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exchange_and_add (volatile uint32_t *mem, int val)
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{
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int tmp, result;
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__asm__ ("\n\
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0: lwarx %0,0,%2 \n\
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add%I3 %1,%0,%3 \n\
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stwcx. %1,0,%2 \n\
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bne- 0b \n\
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" : "=&b"(result), "=&r"(tmp) : "r" (mem), "Ir"(val) : "cr0", "memory");
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return result;
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}
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static __ATOMICITY_INLINE void
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__attribute__ ((unused))
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atomic_add (volatile uint32_t *mem, int val)
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{
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int tmp;
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__asm__ ("\n\
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0: lwarx %0,0,%1 \n\
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add%I2 %0,%0,%2 \n\
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stwcx. %0,0,%1 \n\
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bne- 0b \n\
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" : "=&b"(tmp) : "r" (mem), "Ir"(val) : "cr0", "memory");
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}
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static __ATOMICITY_INLINE int
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__attribute__ ((unused))
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compare_and_swap (volatile long int *p, long int oldval, long int newval)
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{
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int result;
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__asm__ ("\n\
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0: lwarx %0,0,%1 \n\
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sub%I2c. %0,%0,%2 \n\
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cntlzw %0,%0 \n\
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bne- 1f \n\
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stwcx. %3,0,%1 \n\
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bne- 0b \n\
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1: \n\
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" : "=&b"(result) : "r"(p), "Ir"(oldval), "r"(newval) : "cr0", "memory");
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return result >> 5;
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}
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static __ATOMICITY_INLINE long int
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__attribute__ ((unused))
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always_swap (volatile long int *p, long int newval)
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{
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long int result;
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__asm__ ("\n\
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0: lwarx %0,0,%1 \n\
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stwcx. %2,0,%1 \n\
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bne- 0b \n\
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" : "=&r"(result) : "r"(p), "r"(newval) : "cr0", "memory");
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return result;
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}
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static __ATOMICITY_INLINE int
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__attribute__ ((unused))
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test_and_set (volatile long int *p, long int newval)
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{
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int result;
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__asm__ ("\n\
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0: lwarx %0,0,%1 \n\
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cmpwi %0,0 \n\
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bne- 1f \n\
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stwcx. %2,0,%1 \n\
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bne- 0b \n\
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1: \n\
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" : "=&r"(result) : "r"(p), "r"(newval) : "cr0", "memory");
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return result;
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}
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#endif /* atomicity.h */
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