diff options
Diffstat (limited to 'contrib/libstdc++/config/cpu/powerpc/bits/atomicity.h')
-rw-r--r-- | contrib/libstdc++/config/cpu/powerpc/bits/atomicity.h | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/contrib/libstdc++/config/cpu/powerpc/bits/atomicity.h b/contrib/libstdc++/config/cpu/powerpc/bits/atomicity.h new file mode 100644 index 0000000..05addba --- /dev/null +++ b/contrib/libstdc++/config/cpu/powerpc/bits/atomicity.h @@ -0,0 +1,112 @@ +// Low-level functions for atomic operations: PowerPC version -*- C++ -*- + +// Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc. +// +// This file is part of the GNU ISO C++ Library. This library is free +// software; you can redistribute it and/or modify it under the +// terms of the GNU General Public License as published by the +// Free Software Foundation; either version 2, or (at your option) +// any later version. + +// This 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 General Public License for more details. + +// You should have received a copy of the GNU General Public License along +// with this library; see the file COPYING. If not, write to the Free +// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, +// USA. + +// As a special exception, you may use this file as part of a free software +// library without restriction. Specifically, if other files instantiate +// templates or use macros or inline functions from this file, or you compile +// this file and link it with other files to produce an executable, this +// file does not by itself cause the resulting executable to be covered by +// the GNU General Public License. This exception does not however +// invalidate any other reasons why the executable file might be covered by +// the GNU General Public License. + +#ifndef _BITS_ATOMICITY_H +#define _BITS_ATOMICITY_H 1 + +typedef int _Atomic_word; + +static inline _Atomic_word +__attribute__ ((__unused__)) +__exchange_and_add (volatile _Atomic_word* __mem, int __val) +{ + _Atomic_word __tmp, __res; + __asm__ __volatile__ ( + "/* Inline exchange & add */\n" + "0:\t" + "lwarx %0,0,%2 \n\t" + "add%I3 %1,%0,%3 \n\t" + "stwcx. %1,0,%2 \n\t" + "bne- 0b \n\t" + "/* End exchange & add */" + : "=&b"(__res), "=&r"(__tmp) + : "r" (__mem), "Ir"(__val) + : "cr0", "memory"); + return __res; +} + +static inline void +__attribute__ ((__unused__)) +__atomic_add (volatile _Atomic_word *__mem, int __val) +{ + _Atomic_word __tmp; + __asm__ __volatile__ ( + "/* Inline atomic add */\n" + "0:\t" + "lwarx %0,0,%1 \n\t" + "add%I2 %0,%0,%2 \n\t" + "stwcx. %0,0,%1 \n\t" + "bne- 0b \n\t" + "/* End atomic add */" + : "=&b"(__tmp) + : "r" (__mem), "Ir"(__val) + : "cr0", "memory"); +} + +static inline long +__attribute__ ((__unused__)) +__always_swap (volatile long *__p, long int __newval) +{ + long __res; + __asm__ __volatile__ ( + "/* Inline always swap */\n" + "0:\t" + "lwarx %0,0,%1 \n\t" + "stwcx. %2,0,%1 \n\t" + "bne- 0b \n\t" + "/* End always swap */" + : "=&r"(__res) + : "r"(__p), "r"(__newval) + : "cr0", "memory"); + return __res; +} + +static inline int +__attribute__ ((__unused__)) +__test_and_set (volatile long *__p, long int __newval) +{ + int __res; + __asm__ __volatile__ ( + "/* Inline test & set */\n" + "0:\t" + "lwarx %0,0,%1 \n\t" + "cmpwi %0,0 \n\t" + "bne- 1f \n\t" + "stwcx. %2,0,%1 \n\t" + "bne- 0b \n" + "1:\n\t" + "/* End test & set */" + : "=&r"(__res) + : "r"(__p), "r"(__newval) + : "cr0", "memory"); + return __res; +} + +#endif /* atomicity.h */ + |