222 lines
5.3 KiB
C++
222 lines
5.3 KiB
C++
// Low-level functions for atomic operations: ARM version -*- C++ -*-
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// Copyright (C) 2000, 2001 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This 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
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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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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#ifdef __thumb__
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/* Since this function is inlined, we can't be sure of the alignment. */
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__asm__ __volatile__ (
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"ldr %0, 4f \n\t"
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"bx %0 \n\t"
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".align 0 \n"
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"4:\t"
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".word 0f \n\t"
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".code 32 \n"
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"0:\t"
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"ldr %0, [%3] \n\t"
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"add %1, %0, %4 \n\t"
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"swp %2, %1, [%3] \n\t"
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"cmp %0, %2 \n\t"
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"swpne %1, %2, [%3] \n\t"
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"bne 0b \n\t"
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"ldr %1, 1f \n\t"
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"bx %1 \n"
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"1:\t"
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".word 2f \n\t"
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".code 16 \n"
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"2:\n"
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: "=&l"(__result), "=&r"(__tmp), "=&r"(__tmp2)
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: "r" (__mem), "r"(__val)
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: "cc", "memory");
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#else
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__asm__ __volatile__ (
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"\n"
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"0:\t"
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"ldr %0, [%3] \n\t"
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"add %1, %0, %4 \n\t"
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"swp %2, %1, [%3] \n\t"
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"cmp %0, %2 \n\t"
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"swpne %1, %2, [%3] \n\t"
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"bne 0b \n\t"
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""
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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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#endif
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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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#ifdef __thumb__
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/* Since this function is inlined, we can't be sure of the alignment. */
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__asm__ __volatile__ (
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"ldr %0, 4f \n\t"
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"bx %0 \n\t"
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".align 0\n"
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"4:\t"
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".word 0f \n\t"
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".code 32 \n"
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"0:\t"
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"ldr %0, [%3] \n\t"
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"add %1, %0, %4 \n\t"
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"swp %2, %1, [%3] \n\t"
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"cmp %0, %2 \n\t"
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"swpne %1, %2,[%3] \n\t"
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"bne 0b \n\t"
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"ldr %1, 1f \n\t"
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"bx %1 \n"
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"1:\t"
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".word 2f \n\t"
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".code 16 \n"
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"2:\n"
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: "=&l"(__tmp), "=&r"(__tmp2), "=&r"(__tmp3)
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: "r" (__mem), "r"(__val)
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: "cc", "memory");
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#else
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__asm__ __volatile__ (
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"\n"
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"0:\t"
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"ldr %0, [%3] \n\t"
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"add %1, %0, %4 \n\t"
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"swp %2, %1, [%3] \n\t"
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"cmp %0, %2 \n\t"
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"swpne %1, %2, [%3] \n\t"
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"bne 0b \n\t"
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""
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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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#endif
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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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#ifdef __thumb__
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long __tmp;
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/* Since this function is inlined, we can't be sure of the alignment. */
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__asm__ __volatile__ (
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"ldr %0, 4f \n\t"
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"bx %0 \n\t"
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".align 0 \n"
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"4:\t"
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".word 0f \n\t"
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".code 32\n"
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"0:\t"
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"swp %0, %3, [%2] \n\t"
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"ldr %1, 1f \n\t"
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"bx %1 \n"
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"1:\t"
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".word 2f \n\t"
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".code 16 \n"
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"2:\n"
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: "=&l"(__result), "=&r"(__tmp)
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: "r"(__p), "r"(__newval)
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: "memory");
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#else
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__asm__ __volatile__ (
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"\n\t"
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"swp %0, %2, [%1] \n\t"
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""
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: "=&r"(__result)
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: "r"(__p), "r"(__newval)
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: "memory");
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#endif
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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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#ifdef __thumb__
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/* Since this function is inlined, we can't be sure of the alignment. */
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__asm__ __volatile__ (
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"ldr %0, 4f \n\t"
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"bx %0 \n\t"
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".align 0 \n"
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"4:\t"
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".word 0f \n\t"
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".code 32 \n"
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"0:\t"
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"ldr %0, [%2] \n\t"
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"cmp %0, #0 \n\t"
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"bne 1f \n\t"
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"swp %1, %3, [%2] \n\t"
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"cmp %0, %1 \n\t"
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"swpne %0, %1, [%2]\n\t"
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"bne 0b \n"
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"1:\t"
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"ldr %1, 2f \n\t"
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"bx %1 \n"
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"2:\t"
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".word 3f \n\t"
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".code 16 \n"
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"3:"
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: "=&l"(__result), "=r" (__tmp)
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: "r"(__p), "r"(__newval)
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: "cc", "memory");
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#else
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__asm__ __volatile__ (
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"\n"
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"0:\t"
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"ldr %0, [%2] \n\t"
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"cmp %0, #0 \n\t"
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"bne 1f \n\t"
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"swp %1, %3, [%2] \n\t"
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"cmp %0, %1 \n\t"
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"swpne %0, %1, [%2] \n\t"
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"bne 0b \n"
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"1:\n\t"
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""
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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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#endif
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return __result;
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}
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#endif /* atomicity.h */
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