f17d6c73de
2000-04-24 Nathan Myers <ncm@cantrip.org> * config/cpu: Atomicity cleanups. * config/cpu/alpha/bits: New directory. * config/cpu/arm/bits: New directory. * config/cpu/generic/bits: New directory. * config/cpu/i386/bits: New directory. * config/cpu/powerpc/bits: New directory. * config/cpu/sparc/sparc32/bits: New directory. * config/cpu/sparc/sparc32/bits: New directory. * config/cpu/*/bits: Move atomicity.h files to here. From-SVN: r33438
107 lines
2.7 KiB
C
107 lines
2.7 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef _BITS_ATOMICITY_H
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#define _BITS_ATOMICITY_H 1
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typedef int _Atomic_word;
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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 _Atomic_word
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__attribute__ ((unused))
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__exchange_and_add (volatile _Atomic_word* __mem, int __val)
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{
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_Atomic_word __tmp, __result;
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__asm__ ("\
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0: lwarx %0,0,%2
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add%I3 %1,%0,%3
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stwcx. %1,0,%2
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bne- 0b
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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 _Atomic_word *__mem, int __val)
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{
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_Atomic_word __tmp;
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__asm__ ("\
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0: lwarx %0,0,%1
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add%I2 %0,%0,%2
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stwcx. %0,0,%1
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bne- 0b
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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 *p, long int __oldval, long int __newval)
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{
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int __result;
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__asm__ ("\
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0: lwarx %0,0,%1
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sub%I2c. %0,%0,%2
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cntlzw %0,%0
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bne- 1f
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stwcx. %3,0,%1
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bne- 0b
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1:
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" : "=&b"(__result)
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: "r"(__p), "Ir"(__oldval), "r"(__newval)
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: "cr0", "memory");
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return __result >> 5;
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}
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static __ATOMICITY_INLINE long
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__attribute__ ((unused))
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__always_swap (volatile long *__p, long int __newval)
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{
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long __result;
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__asm__ ("\
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0: lwarx %0,0,%1
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stwcx. %2,0,%1
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bne- 0b
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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 *__p, long int __newval)
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{
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int __result;
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__asm__ ("\
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0: lwarx %0,0,%1
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cmpwi %0,0
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bne- 1f
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stwcx. %2,0,%1
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bne- 0b
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1:
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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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