| 1 | // Low-level functions for atomic operations: PowerPC version -*- C++ -*-
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| 2 |
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| 3 | // Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
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| 4 | //
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| 5 | // This file is part of the GNU ISO C++ Library. This library is free
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| 6 | // software; you can redistribute it and/or modify it under the
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| 7 | // terms of the GNU General Public License as published by the
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| 8 | // Free Software Foundation; either version 2, or (at your option)
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| 9 | // any later version.
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| 10 |
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| 11 | // This library is distributed in the hope that it will be useful,
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| 12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | // GNU General Public License for more details.
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| 15 |
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| 16 | // You should have received a copy of the GNU General Public License along
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| 17 | // with this library; see the file COPYING. If not, write to the Free
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| 18 | // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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| 19 | // USA.
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| 20 |
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| 21 | // As a special exception, you may use this file as part of a free software
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| 22 | // library without restriction. Specifically, if other files instantiate
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| 23 | // templates or use macros or inline functions from this file, or you compile
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| 24 | // this file and link it with other files to produce an executable, this
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| 25 | // file does not by itself cause the resulting executable to be covered by
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| 26 | // the GNU General Public License. This exception does not however
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| 27 | // invalidate any other reasons why the executable file might be covered by
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| 28 | // the GNU General Public License.
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| 29 |
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| 30 | #ifndef _BITS_ATOMICITY_H
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| 31 | #define _BITS_ATOMICITY_H 1
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| 32 |
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| 33 | typedef int _Atomic_word;
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| 34 |
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| 35 | static inline _Atomic_word
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| 36 | __attribute__ ((__unused__))
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| 37 | __exchange_and_add (volatile _Atomic_word* __mem, int __val)
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| 38 | {
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| 39 | _Atomic_word __tmp, __res;
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| 40 | __asm__ __volatile__ (
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| 41 | "/* Inline exchange & add */\n"
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| 42 | "0:\t"
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| 43 | "lwarx %0,0,%2 \n\t"
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| 44 | "add%I3 %1,%0,%3 \n\t"
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| 45 | "stwcx. %1,0,%2 \n\t"
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| 46 | "bne- 0b \n\t"
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| 47 | "/* End exchange & add */"
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| 48 | : "=&b"(__res), "=&r"(__tmp)
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| 49 | : "r" (__mem), "Ir"(__val)
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| 50 | : "cr0", "memory");
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| 51 | return __res;
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| 52 | }
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| 53 |
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| 54 | static inline void
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| 55 | __attribute__ ((__unused__))
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| 56 | __atomic_add (volatile _Atomic_word *__mem, int __val)
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| 57 | {
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| 58 | _Atomic_word __tmp;
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| 59 | __asm__ __volatile__ (
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| 60 | "/* Inline atomic add */\n"
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| 61 | "0:\t"
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| 62 | "lwarx %0,0,%1 \n\t"
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| 63 | "add%I2 %0,%0,%2 \n\t"
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| 64 | "stwcx. %0,0,%1 \n\t"
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| 65 | "bne- 0b \n\t"
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| 66 | "/* End atomic add */"
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| 67 | : "=&b"(__tmp)
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| 68 | : "r" (__mem), "Ir"(__val)
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| 69 | : "cr0", "memory");
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| 70 | }
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| 71 |
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| 72 | static inline long
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| 73 | __attribute__ ((__unused__))
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| 74 | __always_swap (volatile long *__p, long int __newval)
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| 75 | {
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| 76 | long __res;
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| 77 | __asm__ __volatile__ (
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| 78 | "/* Inline always swap */\n"
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| 79 | "0:\t"
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| 80 | "lwarx %0,0,%1 \n\t"
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| 81 | "stwcx. %2,0,%1 \n\t"
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| 82 | "bne- 0b \n\t"
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| 83 | "/* End always swap */"
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| 84 | : "=&r"(__res)
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| 85 | : "r"(__p), "r"(__newval)
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| 86 | : "cr0", "memory");
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| 87 | return __res;
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| 88 | }
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| 89 |
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| 90 | static inline int
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| 91 | __attribute__ ((__unused__))
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| 92 | __test_and_set (volatile long *__p, long int __newval)
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| 93 | {
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| 94 | int __res;
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| 95 | __asm__ __volatile__ (
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| 96 | "/* Inline test & set */\n"
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| 97 | "0:\t"
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| 98 | "lwarx %0,0,%1 \n\t"
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| 99 | "cmpwi %0,0 \n\t"
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| 100 | "bne- 1f \n\t"
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| 101 | "stwcx. %2,0,%1 \n\t"
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| 102 | "bne- 0b \n"
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| 103 | "1:\n\t"
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| 104 | "/* End test & set */"
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| 105 | : "=&r"(__res)
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| 106 | : "r"(__p), "r"(__newval)
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| 107 | : "cr0", "memory");
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| 108 | return __res;
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| 109 | }
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| 110 |
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| 111 | #endif /* atomicity.h */
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| 112 |
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