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5624e564 | 1 | /* Copyright (C) 2005-2015 Free Software Foundation, Inc. |
318e8c3f IG |
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 | |
748086b7 JJ |
7 | under the terms of the GNU General Public License as published by |
8 | the Free Software Foundation; either version 3, or (at your option) | |
9 | any later version. | |
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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 | |
748086b7 | 13 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
318e8c3f IG |
14 | more details. |
15 | ||
748086b7 JJ |
16 | Under Section 7 of GPL version 3, you are granted additional |
17 | permissions described in the GCC Runtime Library Exception, version | |
18 | 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | You should have received a copy of the GNU General Public License and | |
21 | a copy of the GCC Runtime Library Exception along with this program; | |
22 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | <http://www.gnu.org/licenses/>. */ | |
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24 | |
25 | /* Provide target-specific access to the futex system call. */ | |
26 | ||
27 | #include <sys/syscall.h> | |
c8451a46 SE |
28 | |
29 | #if !defined (SYS_futex) | |
30 | #define SYS_futex __NR_futex | |
31 | #endif | |
32 | ||
318e8c3f IG |
33 | #define FUTEX_WAIT 0 |
34 | #define FUTEX_WAKE 1 | |
35 | ||
c24dbebb CLT |
36 | #ifdef __mips16 |
37 | static void __attribute__((noinline,nomips16)) | |
38 | #else | |
318e8c3f | 39 | static inline void |
c24dbebb | 40 | #endif |
318e8c3f IG |
41 | sys_futex0 (int *addr, int op, int val) |
42 | { | |
c24dbebb | 43 | register unsigned long __v0 asm("$2"); |
318e8c3f IG |
44 | register unsigned long __a0 asm("$4") = (unsigned long) addr; |
45 | register unsigned long __a1 asm("$5") = (unsigned long) op; | |
46 | register unsigned long __a2 asm("$6") = (unsigned long) val; | |
47 | register unsigned long __a3 asm("$7") = 0; | |
48 | ||
c24dbebb CLT |
49 | __asm volatile ("li $2, %6\n\t" |
50 | "syscall" | |
318e8c3f IG |
51 | /* returns $a3 (errno), $v0 (return value) */ |
52 | : "=r" (__v0), "=r" (__a3) | |
c24dbebb CLT |
53 | /* arguments in a0-a3, and syscall number */ |
54 | : "r" (__a0), "r" (__a1), "r" (__a2), "r" (__a3), | |
55 | "IK" (SYS_futex) | |
318e8c3f IG |
56 | /* clobbers at, v1, t0-t9, memory */ |
57 | : "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", "$14", | |
58 | "$15", "$24", "$25", "memory"); | |
59 | } | |
60 | ||
61 | static inline void | |
62 | futex_wait (int *addr, int val) | |
63 | { | |
64 | sys_futex0 (addr, FUTEX_WAIT, val); | |
65 | } | |
66 | ||
67 | static inline void | |
68 | futex_wake (int *addr, int count) | |
69 | { | |
70 | sys_futex0 (addr, FUTEX_WAKE, count); | |
71 | } | |
72 | ||
73 | static inline void | |
74 | cpu_relax (void) | |
75 | { | |
76 | __asm volatile ("" : : : "memory"); | |
77 | } |