79f41ea419
2000-11-28 Franz Sirl <Franz.Sirl-kernel@lauterbach.com> * config/cpu/powerpc/bits/atomicity.h (__exchange_and_add): Silence preprocessor multi-line string warnings. (__atomic_add): Likewise. (__compare_and_swap): Likewise. (__always_swap): Likewise. (__test_and_set): Likewise. * config/cpu/arm/bits/atomicity.h (__exchange_and_add): Likewise. (__atomic_add): Likewise. (__compare_and_swap): Likewise. (__always_swap): Likewise. (__test_and_set): Likewise. From-SVN: r37831
125 lines
3.1 KiB
C
125 lines
3.1 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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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, __res;
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__asm__ __volatile__ (
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"/* Inline exchange & add */\n"
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"0:\t"
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"lwarx %0,0,%2 \n\t"
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"add%I3 %1,%0,%3 \n\t"
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"stwcx. %1,0,%2 \n\t"
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"bne- 0b \n\t"
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"/* End exchange & add */"
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: "=&b"(__res), "=&r"(__tmp)
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: "r" (__mem), "Ir"(__val)
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: "cr0", "memory");
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return __res;
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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;
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__asm__ __volatile__ (
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"/* Inline atomic add */\n"
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"0:\t"
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"lwarx %0,0,%1 \n\t"
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"add%I2 %0,%0,%2 \n\t"
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"stwcx. %0,0,%1 \n\t"
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"bne- 0b \n\t"
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"/* End atomic add */"
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: "=&b"(__tmp)
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: "r" (__mem), "Ir"(__val)
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: "cr0", "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 int __oldval, long int __newval)
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{
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int __res;
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__asm__ __volatile__ (
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"/* Inline compare & swap */\n"
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"0:\t"
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"lwarx %0,0,%1 \n\t"
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"sub%I2c. %0,%0,%2 \n\t"
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"cntlzw %0,%0 \n\t"
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"bne- 1f \n\t"
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"stwcx. %3,0,%1 \n\t"
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"bne- 0b \n"
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"1:\n\t"
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"/* End compare & swap */"
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: "=&b"(__res)
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: "r"(__p), "Ir"(__oldval), "r"(__newval)
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: "cr0", "memory");
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return __res >> 5;
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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 int __newval)
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{
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long __res;
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__asm__ __volatile__ (
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"/* Inline always swap */\n"
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"0:\t"
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"lwarx %0,0,%1 \n\t"
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"stwcx. %2,0,%1 \n\t"
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"bne- 0b \n\t"
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"/* End always swap */"
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: "=&r"(__res)
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: "r"(__p), "r"(__newval)
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: "cr0", "memory");
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return __res;
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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 int __newval)
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{
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int __res;
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__asm__ __volatile__ (
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"/* Inline test & set */\n"
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"0:\t"
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"lwarx %0,0,%1 \n\t"
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"cmpwi %0,0 \n\t"
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"bne- 1f \n\t"
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"stwcx. %2,0,%1 \n\t"
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"bne- 0b \n"
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"1:\n\t"
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"/* End test & set */"
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: "=&r"(__res)
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: "r"(__p), "r"(__newval)
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: "cr0", "memory");
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return __res;
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}
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#endif /* atomicity.h */
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