projects / thirdparty / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 gpr2 __asm__ ("2"); | |
| 36 | register long int gpr3 __asm__ ("3"); | |
| 37 | register long int gpr4 __asm__ ("4"); | |
| 38 | register long int gpr5 __asm__ ("5"); | |
| 39 | ||
| 40 | gpr2 = (long) addr; | |
| 41 | gpr3 = op; | |
| 42 | gpr4 = val; | |
| 43 | gpr5 = 0; | |
| 44 | ||
| 45 | __asm volatile ("svc %b1" | |
| 46 | : "=d" (gpr2) | |
| 47 | : "i" (SYS_futex), | |
| 48 | "0" (gpr2), "d" (gpr3), "d" (gpr4), "d" (gpr5) | |
| 49 | : "memory"); | |
| a68ab351 | 50 | return gpr2; |
| 953ff289 DN |
51 | } |
| 52 | ||
| 53 | static inline void | |
| 54 | futex_wait (int *addr, int val) | |
| 55 | { | |
| a68ab351 JJ |
56 | long err = sys_futex0 (addr, gomp_futex_wait, val); |
| 57 | if (__builtin_expect (err == -ENOSYS, 0)) | |
| 58 | { | |
| 59 | gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; | |
| 60 | gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; | |
| 61 | sys_futex0 (addr, gomp_futex_wait, val); | |
| 62 | } | |
| 953ff289 DN |
63 | } |
| 64 | ||
| 65 | static inline void | |
| 66 | futex_wake (int *addr, int count) | |
| 67 | { | |
| a68ab351 JJ |
68 | long err = sys_futex0 (addr, gomp_futex_wake, count); |
| 69 | if (__builtin_expect (err == -ENOSYS, 0)) | |
| 70 | { | |
| 71 | gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; | |
| 72 | gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; | |
| 73 | sys_futex0 (addr, gomp_futex_wake, count); | |
| 74 | } | |
| 75 | } | |
| 76 | ||
| 77 | static inline void | |
| 78 | cpu_relax (void) | |
| 79 | { | |
| 80 | __asm volatile ("" : : : "memory"); | |
| 81 | } | |
| 82 | ||
| 83 | static inline void | |
| 84 | atomic_write_barrier (void) | |
| 85 | { | |
| 86 | __sync_synchronize (); | |
| 953ff289 | 87 | } |