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a68ab351 | 1 | /* Copyright (C) 2005, 2008 Free Software Foundation, Inc. |
953ff289 DN |
2 | Contributed by Jakub Jelinek <jakub@redhat.com>. |
3 | ||
4 | This file is part of the GNU OpenMP Library (libgomp). | |
5 | ||
6 | Libgomp is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
13 | FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for | |
14 | more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with libgomp; see the file COPYING.LIB. If not, write to the | |
18 | Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, | |
19 | MA 02110-1301, USA. */ | |
20 | ||
21 | /* As a special exception, if you link this library with other files, some | |
22 | of which are compiled with GCC, to produce an executable, this library | |
23 | does not by itself cause the resulting executable to be covered by the | |
24 | GNU General Public License. This exception does not however invalidate | |
25 | any other reasons why the executable file might be covered by the GNU | |
26 | General Public License. */ | |
27 | ||
28 | /* Provide target-specific access to the futex system call. */ | |
29 | ||
30 | #include <sys/syscall.h> | |
953ff289 | 31 | |
a68ab351 | 32 | static inline long |
953ff289 DN |
33 | sys_futex0 (int *addr, int op, int val) |
34 | { | |
35 | register long int g1 __asm__ ("g1"); | |
36 | register long int o0 __asm__ ("o0"); | |
37 | register long int o1 __asm__ ("o1"); | |
38 | register long int o2 __asm__ ("o2"); | |
39 | register long int o3 __asm__ ("o3"); | |
40 | ||
41 | g1 = SYS_futex; | |
42 | o0 = (long) addr; | |
43 | o1 = op; | |
44 | o2 = val; | |
45 | o3 = 0; | |
46 | ||
47 | #ifdef __arch64__ | |
a68ab351 | 48 | # define SYSCALL_STRING "ta\t0x6d; bcs,a,pt %%xcc, 1f; sub %%g0, %%o0, %%o0; 1:" |
953ff289 | 49 | #else |
a68ab351 | 50 | # define SYSCALL_STRING "ta\t0x10; bcs,a 1f; sub %%g0, %%o0, %%o0; 1:" |
953ff289 DN |
51 | #endif |
52 | ||
53 | __asm volatile (SYSCALL_STRING | |
54 | : "=r" (g1), "=r" (o0) | |
55 | : "0" (g1), "1" (o0), "r" (o1), "r" (o2), "r" (o3) | |
56 | : "g2", "g3", "g4", "g5", "g6", | |
57 | "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", | |
58 | "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", | |
59 | "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23", | |
60 | "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31", | |
61 | #ifdef __arch64__ | |
62 | "f32", "f34", "f36", "f38", "f40", "f42", "f44", "f46", | |
63 | "f48", "f50", "f52", "f54", "f56", "f58", "f60", "f62", | |
64 | #endif | |
65 | "cc", "memory"); | |
a68ab351 | 66 | return o0; |
953ff289 DN |
67 | } |
68 | ||
69 | static inline void | |
70 | futex_wait (int *addr, int val) | |
71 | { | |
a68ab351 JJ |
72 | long err = sys_futex0 (addr, gomp_futex_wait, val); |
73 | if (__builtin_expect (err == ENOSYS, 0)) | |
74 | { | |
75 | gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; | |
76 | gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; | |
77 | sys_futex0 (addr, gomp_futex_wait, val); | |
78 | } | |
953ff289 DN |
79 | } |
80 | ||
81 | static inline void | |
82 | futex_wake (int *addr, int count) | |
83 | { | |
a68ab351 JJ |
84 | long err = sys_futex0 (addr, gomp_futex_wake, count); |
85 | if (__builtin_expect (err == ENOSYS, 0)) | |
86 | { | |
87 | gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; | |
88 | gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; | |
89 | sys_futex0 (addr, gomp_futex_wake, count); | |
90 | } | |
91 | } | |
92 | ||
93 | static inline void | |
94 | cpu_relax (void) | |
95 | { | |
96 | #if defined __arch64__ || defined __sparc_v9__ | |
97 | __asm volatile ("membar #LoadLoad" : : : "memory"); | |
98 | #else | |
99 | __asm volatile ("" : : : "memory"); | |
100 | #endif | |
101 | } | |
102 | ||
103 | static inline void | |
104 | atomic_write_barrier (void) | |
105 | { | |
106 | #if defined __arch64__ || defined __sparc_v9__ | |
107 | __asm volatile ("membar #StoreStore" : : : "memory"); | |
108 | #else | |
109 | __sync_synchronize (); | |
110 | #endif | |
953ff289 | 111 | } |