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8d9254fc | 1 | /* Copyright (C) 2011-2020 Free Software Foundation, Inc. |
dd552284 WL |
2 | Contributed by Walter Lee (walt@tilera.com) |
3 | ||
f1f3453e TS |
4 | This file is part of the GNU Offloading and Multi Processing Library |
5 | (libgomp). | |
dd552284 WL |
6 | |
7 | Libgomp is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3, or (at your option) | |
10 | any later version. | |
11 | ||
12 | Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
14 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
15 | more details. | |
16 | ||
17 | Under Section 7 of GPL version 3, you are granted additional | |
18 | permissions described in the GCC Runtime Library Exception, version | |
19 | 3.1, as published by the Free Software Foundation. | |
20 | ||
21 | You should have received a copy of the GNU General Public License and | |
22 | a copy of the GCC Runtime Library Exception along with this program; | |
23 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 | <http://www.gnu.org/licenses/>. */ | |
25 | ||
26 | /* Provide target-specific access to the futex system call. */ | |
27 | ||
28 | #include <sys/syscall.h> | |
29 | #include <linux/futex.h> | |
30 | ||
31 | static inline void | |
32 | sys_futex0 (int *addr, int op, int val) | |
33 | { | |
34 | long _sys_result; | |
35 | long _clobber_r2, _clobber_r3, _clobber_r4, _clobber_r5, _clobber_r10; | |
36 | int err; | |
37 | ||
38 | __asm__ __volatile__ ( | |
39 | "swint1" | |
40 | : "=R00" (_sys_result), "=R01" (err), "=R02" (_clobber_r2), | |
41 | "=R03" (_clobber_r3), "=R04" (_clobber_r4), "=R05" (_clobber_r5), | |
42 | "=R10" (_clobber_r10) | |
43 | : "R10" (SYS_futex), "R00" (addr), "R01" (op), "R02" (val), | |
44 | "R03" (0) | |
45 | : "r6", "r7", | |
46 | "r8", "r9", "r11", "r12", "r13", "r14", "r15", | |
47 | "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", | |
48 | "r24", "r25", "r26", "r27", "r28", "r29", "memory"); | |
49 | } | |
50 | ||
51 | static inline void | |
52 | futex_wait (int *addr, int val) | |
53 | { | |
54 | sys_futex0 (addr, FUTEX_WAIT, val); | |
55 | } | |
56 | ||
57 | static inline void | |
58 | futex_wake (int *addr, int count) | |
59 | { | |
60 | sys_futex0 (addr, FUTEX_WAKE, count); | |
61 | } | |
62 | ||
63 | static inline void | |
64 | cpu_relax (void) | |
65 | { | |
66 | __asm volatile ("" : : : "memory"); | |
67 | } | |
68 | ||
69 | static inline void | |
70 | atomic_write_barrier (void) | |
71 | { | |
72 | __sync_synchronize (); | |
73 | } |