| /* Copyright (C) 2005-2013 Free Software Foundation, Inc. |
| Contributed by Ilie Garbacea <ilie@mips.com>, Chao-ying Fu <fu@mips.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> |
| #define FUTEX_WAIT 0 |
| #define FUTEX_WAKE 1 |
| |
| #ifdef __mips16 |
| static void __attribute__((noinline,nomips16)) |
| #else |
| static inline void |
| #endif |
| sys_futex0 (int *addr, int op, int val) |
| { |
| register unsigned long __v0 asm("$2"); |
| register unsigned long __a0 asm("$4") = (unsigned long) addr; |
| register unsigned long __a1 asm("$5") = (unsigned long) op; |
| register unsigned long __a2 asm("$6") = (unsigned long) val; |
| register unsigned long __a3 asm("$7") = 0; |
| |
| __asm volatile ("li $2, %6\n\t" |
| "syscall" |
| /* returns $a3 (errno), $v0 (return value) */ |
| : "=r" (__v0), "=r" (__a3) |
| /* arguments in a0-a3, and syscall number */ |
| : "r" (__a0), "r" (__a1), "r" (__a2), "r" (__a3), |
| "IK" (SYS_futex) |
| /* clobbers at, v1, t0-t9, memory */ |
| : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", "$14", |
| "$15", "$24", "$25", "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); |
| } |
| |
| static inline void |
| cpu_relax (void) |
| { |
| __asm volatile ("" : : : "memory"); |
| } |