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1 | /* Copyright (C) 2005, 2008 Free Software Foundation, Inc. |
2 | Contributed by Ilie Garbacea <ilie@mips.com>, Chao-ying Fu <fu@mips.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> | |
31 | #define FUTEX_WAIT 0 | |
32 | #define FUTEX_WAKE 1 | |
33 | ||
34 | static inline void | |
35 | sys_futex0 (int *addr, int op, int val) | |
36 | { | |
37 | register unsigned long __v0 asm("$2") = (unsigned long) SYS_futex; | |
38 | register unsigned long __a0 asm("$4") = (unsigned long) addr; | |
39 | register unsigned long __a1 asm("$5") = (unsigned long) op; | |
40 | register unsigned long __a2 asm("$6") = (unsigned long) val; | |
41 | register unsigned long __a3 asm("$7") = 0; | |
42 | ||
43 | __asm volatile ("syscall" | |
44 | /* returns $a3 (errno), $v0 (return value) */ | |
45 | : "=r" (__v0), "=r" (__a3) | |
46 | /* arguments in v0 (syscall) a0-a3 */ | |
47 | : "r" (__v0), "r" (__a0), "r" (__a1), "r" (__a2), "r" (__a3) | |
48 | /* clobbers at, v1, t0-t9, memory */ | |
49 | : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", "$14", | |
50 | "$15", "$24", "$25", "memory"); | |
51 | } | |
52 | ||
53 | static inline void | |
54 | futex_wait (int *addr, int val) | |
55 | { | |
56 | sys_futex0 (addr, FUTEX_WAIT, val); | |
57 | } | |
58 | ||
59 | static inline void | |
60 | futex_wake (int *addr, int count) | |
61 | { | |
62 | sys_futex0 (addr, FUTEX_WAKE, count); | |
63 | } | |
64 | ||
65 | static inline void | |
66 | cpu_relax (void) | |
67 | { | |
68 | __asm volatile ("" : : : "memory"); | |
69 | } | |
70 | ||
71 | static inline void | |
72 | atomic_write_barrier (void) | |
73 | { | |
74 | __sync_synchronize (); | |
75 | } |