| /* Copyright (C) 2011-2026 Free Software Foundation, Inc. | |
| 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/>. */ | |
| /* Provide target-specific access to the futex system call. */ | |
| #include <sys/syscall.h> | |
| /* 4 instruction cycles not accessing cache and TLB are needed after | |
| trapa instruction to avoid an SH-4 silicon bug. */ | |
| #define SYSCALL_WITH_INST_PAD "\ | |
| trapa #0x14; or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0" | |
| static inline long | |
| sys_futex0 (std::atomic<int> *addr, int op, int val) | |
| { | |
| int __status; | |
| register long __r3 asm ("r3") = SYS_futex; | |
| register long __r4 asm ("r4") = (long) addr; | |
| register long __r5 asm ("r5") = op; | |
| register long __r6 asm ("r6") = val; | |
| register long __r7 asm ("r7") = 0; | |
| __asm __volatile (SYSCALL_WITH_INST_PAD | |
| : "=z" (__status) | |
| : "r" (__r3), "r" (__r4), "r" (__r5), | |
| "r" (__r6), "r" (__r7) | |
| : "memory", "t"); | |
| return __status; | |
| } |