| /* Copyright (C) 2005 Free Software Foundation, Inc. |
| Contributed by Richard Henderson <rth@redhat.com>. |
| |
| This file is part of the GNU OpenMP Library (libgomp). |
| |
| Libgomp is free software; you can redistribute it and/or modify it |
| under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2.1 of the License, or |
| (at your option) any later version. |
| |
| Libgomp 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 Lesser General Public License for |
| more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with libgomp; see the file COPYING.LIB. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, |
| MA 02110-1301, USA. */ |
| |
| /* As a special exception, if you link this library with other files, some |
| of which are compiled with GCC, to produce an executable, this library |
| does not by itself cause the resulting executable to be covered by the |
| GNU General Public License. This exception does not however invalidate |
| any other reasons why the executable file might be covered by the GNU |
| General Public License. */ |
| |
| /* Provide target-specific access to the futex system call. */ |
| |
| #include <sys/syscall.h> |
| #define FUTEX_WAIT 0 |
| #define FUTEX_WAKE 1 |
| |
| static inline void |
| sys_futex0 (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" |
| : "=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"); |
| } |
| |
| static inline void |
| futex_wait (int *addr, int val) |
| { |
| sys_futex0 (addr, FUTEX_WAIT, val); |
| } |
| |
| static inline void |
| futex_wake (int *addr, int count) |
| { |
| sys_futex0 (addr, FUTEX_WAKE, count); |
| } |