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2000-08-22 Richard B. Kreckel <Richard.Kreckel@Uni-Mainz.DE> * config/cpu/alpha/bits/atomicity.h: Change __attribute__ ((unused)) to __attribute__ ((__unused__)). * config/cpu/arm/bits/atomicity.h: Same. * config/cpu/generic/bits/atomicity.h: Same. * config/cpu/i386/bits/atomicity.h: Same. * config/cpu/i486/bits/atomicity.h: Same. * config/cpu/powerpc/bits/atomicity.h: Same. * config/cpu/sparc/sparc32/bits/atomicity.h: Same. * config/cpu/sparc/sparc64/bits/atomicity.h: Same. From-SVN: r35882
116 lines
3.0 KiB
C
116 lines
3.0 KiB
C
/* Low-level functions for atomic operations. ARM version.
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Copyright (C) 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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static 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, __tmp2, __result;
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__asm__ ("\
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0: ldr %0,[%3]
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add %1,%0,%4
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swp %2,%1,[%3]
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cmp %0,%2
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swpne %1,%2,[%3]
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bne 0b
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" : "=&r"(__result), "=&r"(__tmp), "=&r"(__tmp2)
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: "r" (__mem), "r"(__val)
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: "cc", "memory");
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return __result;
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}
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static 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, __tmp2, __tmp3;
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__asm__ ("\
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0: ldr %0,[%3]
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add %1,%0,%4
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swp %2,%1,[%3]
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cmp %0,%2
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swpne %1,%2,[%3]
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bne 0b
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" : "=&r"(__tmp), "=&r"(__tmp2), "=&r"(__tmp3)
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: "r" (__mem), "r"(__val)
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: "cc", "memory");
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}
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static inline int
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__attribute__ ((__unused__))
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__compare_and_swap (volatile long *__p, long __oldval, long __newval)
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{
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int __result;
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long __tmp;
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__asm__ ("\
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0: ldr %1,[%2]
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mov %0,#0
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cmp %1,%4
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bne 1f
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swp %0,%3,[%2]
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cmp %1,%0
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swpne %1,%0,[%2]
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bne 0b
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mov %0,#1
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1:
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" : "=&r"(__result), "=&r"(__tmp)
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: "r" (__p), "r" (__newval), "r" (__oldval)
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: "cc", "memory");
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return __result;
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}
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static inline long
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__attribute__ ((__unused__))
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__always_swap (volatile long *__p, long __newval)
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{
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long __result;
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__asm__ ("\
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swp %0,%2,[%1]
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" : "=&r"(__result) : "r"(__p), "r"(__newval) : "memory");
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return __result;
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}
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static inline int
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__attribute__ ((__unused__))
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__test_and_set (volatile long *__p, long __newval)
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{
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int __result;
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long __tmp;
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__asm__ ("\
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0: ldr %0,[%2]
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cmp %0,#0
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bne 1f
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swp %1,%3,[%2]
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cmp %0,%1
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swpne %0,%1,[%2]
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bne 0b
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1:
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" : "=&r"(__result), "=r" (__tmp)
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: "r"(__p), "r"(__newval)
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: "cc", "memory");
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return __result;
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}
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#endif /* atomicity.h */
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