| /* Copyright (C) 2011-2021 Free Software Foundation, Inc. |
| Contributed by Walter Lee (walt@tilera.com) |
| |
| This file is part of the GNU Offloading and Multi Processing 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> |
| #include <linux/futex.h> |
| |
| static inline void |
| sys_futex0 (int *addr, int op, int val) |
| { |
| long _sys_result; |
| long _clobber_r2, _clobber_r3, _clobber_r4, _clobber_r5, _clobber_r10; |
| int err; |
| |
| __asm__ __volatile__ ( |
| "swint1" |
| : "=R00" (_sys_result), "=R01" (err), "=R02" (_clobber_r2), |
| "=R03" (_clobber_r3), "=R04" (_clobber_r4), "=R05" (_clobber_r5), |
| "=R10" (_clobber_r10) |
| : "R10" (SYS_futex), "R00" (addr), "R01" (op), "R02" (val), |
| "R03" (0) |
| : "r6", "r7", |
| "r8", "r9", "r11", "r12", "r13", "r14", "r15", |
| "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", |
| "r24", "r25", "r26", "r27", "r28", "r29", "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"); |
| } |
| |
| static inline void |
| atomic_write_barrier (void) |
| { |
| __sync_synchronize (); |
| } |