| /* Copyright (C) 2005-2013 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 General Public License as published by |
| the Free Software Foundation; either version 3, 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 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/>. */ |
| |
| /* Provide target-specific access to the futex system call. */ |
| |
| #include <sys/syscall.h> |
| |
| |
| |
| static inline long |
| sys_futex0(int *addr, long op, int val) |
| { |
| register long out0 asm ("out0") = (long) addr; |
| register long out1 asm ("out1") = op; |
| register long out2 asm ("out2") = val; |
| register long out3 asm ("out3") = 0; |
| register long r8 asm ("r8"); |
| register long r10 asm ("r10"); |
| register long r15 asm ("r15") = SYS_futex; |
| |
| __asm __volatile ("break 0x100000" |
| : "=r"(r15), "=r"(out0), "=r"(out1), "=r"(out2), "=r"(out3), |
| "=r"(r8), "=r"(r10) |
| : "r"(r15), "r"(out0), "r"(out1), "r"(out2), "r"(out3) |
| : "memory", "out4", "out5", "out6", "out7", |
| /* Non-stacked integer registers, minus r8, r10, r15. */ |
| "r2", "r3", "r9", "r11", "r12", "r13", "r14", "r16", "r17", "r18", |
| "r19", "r20", "r21", "r22", "r23", "r24", "r25", "r26", "r27", |
| "r28", "r29", "r30", "r31", |
| /* Predicate registers. */ |
| "p6", "p7", "p8", "p9", "p10", "p11", "p12", "p13", "p14", "p15", |
| /* Non-rotating fp registers. */ |
| "f6", "f7", "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", |
| /* Branch registers. */ |
| "b6"); |
| return r8 & r10; |
| } |
| |
| static inline void |
| futex_wait (int *addr, int val) |
| { |
| long err = sys_futex0 (addr, gomp_futex_wait, val); |
| if (__builtin_expect (err == ENOSYS, 0)) |
| { |
| gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; |
| gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; |
| sys_futex0 (addr, gomp_futex_wait, val); |
| } |
| } |
| |
| static inline void |
| futex_wake (int *addr, int count) |
| { |
| long err = sys_futex0 (addr, gomp_futex_wake, count); |
| if (__builtin_expect (err == ENOSYS, 0)) |
| { |
| gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; |
| gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; |
| sys_futex0 (addr, gomp_futex_wake, count); |
| } |
| } |
| |
| static inline void |
| cpu_relax (void) |
| { |
| __asm volatile ("hint @pause" : : : "memory"); |
| } |