44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
/*
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* This file is part of ltrace.
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* Copyright (C) 2012 Petr Machata, Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU 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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*
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* This program is distributed in the hope that it will be useful, but
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* 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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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include <stdint.h>
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__attribute__((noinline, optimize(3))) void
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atomic_add(uint32_t *a, uint32_t b)
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{
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__asm__ volatile("lwarx 9,0,%0\n"
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"add 9,9,%2\n"
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"stwcx. 9,0,%0\n"
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"bne- atomic_add\n"
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: "=r"(a)
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: "0"(a), "r"(b)
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: "%r9");
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}
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uint32_t a = 0;
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__attribute__((optimize(0))) int
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main(int argc, char **argv)
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{
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atomic_add(&a, 5);
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atomic_add(&a, 10);
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atomic_add(&a, 15);
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return a;
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}
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