| /* Copyright (C) 2012 Free Software Foundation, Inc. |
| Contributed by Richard Henderson <rth@redhat.com>. |
| |
| This file is part of the GNU Transactional Memory Library (libitm). |
| |
| Libitm 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 3 of the License, or |
| (at your option) any later version. |
| |
| Libitm 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. |
| |
| Under Section 7 of GPL version 3, you are granted additional |
| permissions described in the GCC Runtime Library Exception, version |
| 3.1, as published by the Free Software Foundation. |
| |
| You should have received a copy of the GNU General Public License and |
| a copy of the GCC Runtime Library Exception along with this program; |
| see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <sys/syscall.h> |
| |
| static inline long |
| sys_futex0 (std::atomic<int> *addr, int op, int val) |
| { |
| register long int r0 __asm__ ("r0"); |
| register long int r3 __asm__ ("r3"); |
| register long int r4 __asm__ ("r4"); |
| register long int r5 __asm__ ("r5"); |
| register long int r6 __asm__ ("r6"); |
| |
| r0 = SYS_futex; |
| r3 = (long) addr; |
| r4 = op; |
| r5 = val; |
| r6 = 0; |
| |
| /* ??? The powerpc64 sysdep.h file clobbers ctr; the powerpc32 sysdep.h |
| doesn't. It doesn't much matter for us. In the interest of unity, |
| go ahead and clobber it always. */ |
| |
| __asm volatile ("sc; mfcr %0" |
| : "=r"(r0), "=r"(r3), "=r"(r4), "=r"(r5), "=r"(r6) |
| : "r"(r0), "r"(r3), "r"(r4), "r"(r5), "r"(r6) |
| : "r7", "r8", "r9", "r10", "r11", "r12", |
| "cr0", "ctr", "memory"); |
| if (__builtin_expect (r0 & (1 << 28), 0)) |
| return r3; |
| return 0; |
| } |