| /* Copyright (C) 2008-2021 Free Software Foundation, Inc. |
| Contributed by Richard Henderson <rth@redhat.com>. |
| |
| 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. */ |
| |
| #ifndef SYS_futex |
| #define SYS_futex 394 |
| #endif |
| |
| static inline long |
| sys_futex0 (std::atomic<int> *addr, int op, int val) |
| { |
| register long sc_0 __asm__("$0"); |
| register long sc_16 __asm__("$16"); |
| register long sc_17 __asm__("$17"); |
| register long sc_18 __asm__("$18"); |
| register long sc_19 __asm__("$19"); |
| long res; |
| |
| sc_0 = SYS_futex; |
| sc_16 = (long) addr; |
| sc_17 = op; |
| sc_18 = val; |
| sc_19 = 0; |
| __asm volatile ("callsys" |
| : "=r" (sc_0), "=r"(sc_19) |
| : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18), "1"(sc_19) |
| : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", |
| "$22", "$23", "$24", "$25", "$27", "$28", "memory"); |
| |
| res = sc_0; |
| if (__builtin_expect (sc_19, 0)) |
| res = -res; |
| return res; |
| } |