| /* |
| * This file is part of ltrace. |
| * Copyright (C) 2012 Petr Machata, Red Hat Inc. |
| * |
| * This program 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 of the |
| * License, or (at your option) any later version. |
| * |
| * This program 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 program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
| * 02110-1301 USA |
| */ |
| |
| #include <stdint.h> |
| |
| __attribute__((noinline, optimize(3))) void |
| atomic_add(uint32_t *a, uint32_t b) |
| { |
| __asm__ volatile("lwarx 9,0,%0\n" |
| "add 9,9,%2\n" |
| "stwcx. 9,0,%0\n" |
| "bne- atomic_add\n" |
| : "=r"(a) |
| : "0"(a), "r"(b) |
| : "%r9"); |
| } |
| |
| uint32_t a = 0; |
| |
| __attribute__((optimize(0))) int |
| main(int argc, char **argv) |
| { |
| atomic_add(&a, 5); |
| atomic_add(&a, 10); |
| atomic_add(&a, 15); |
| return a; |
| } |