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fbd26352 | 1 | /* Copyright (C) 2011-2019 Free Software Foundation, Inc. |
f4f88eba | 2 | |
3 | This file is part of the GNU Transactional Memory Library (libitm). | |
4 | ||
5 | Libitm is free software; you can redistribute it and/or modify it | |
6 | under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | Libitm is distributed in the hope that it will be useful, but WITHOUT ANY | |
11 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
12 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | more details. | |
14 | ||
15 | Under Section 7 of GPL version 3, you are granted additional | |
16 | permissions described in the GCC Runtime Library Exception, version | |
17 | 3.1, as published by the Free Software Foundation. | |
18 | ||
19 | You should have received a copy of the GNU General Public License and | |
20 | a copy of the GCC Runtime Library Exception along with this program; | |
21 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
22 | <http://www.gnu.org/licenses/>. */ | |
23 | ||
24 | /* Provide target-specific access to the futex system call. */ | |
25 | ||
26 | #include <sys/syscall.h> | |
27 | ||
28 | /* 4 instruction cycles not accessing cache and TLB are needed after | |
29 | trapa instruction to avoid an SH-4 silicon bug. */ | |
30 | ||
31 | #define SYSCALL_WITH_INST_PAD "\ | |
32 | trapa #0x14; or r0,r0; or r0,r0; or r0,r0; or r0,r0; or r0,r0" | |
33 | ||
34 | static inline long | |
da3b7968 | 35 | sys_futex0 (std::atomic<int> *addr, int op, int val) |
f4f88eba | 36 | { |
37 | int __status; | |
38 | register long __r3 asm ("r3") = SYS_futex; | |
39 | register long __r4 asm ("r4") = (long) addr; | |
40 | register long __r5 asm ("r5") = op; | |
41 | register long __r6 asm ("r6") = val; | |
42 | register long __r7 asm ("r7") = 0; | |
43 | ||
44 | __asm __volatile (SYSCALL_WITH_INST_PAD | |
45 | : "=z" (__status) | |
46 | : "r" (__r3), "r" (__r4), "r" (__r5), | |
47 | "r" (__r6), "r" (__r7) | |
48 | : "memory", "t"); | |
49 | return __status; | |
50 | } |