git://gcc.gnu.org / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| 5624e564 | 1 | /* Copyright (C) 2005-2015 Free Software Foundation, Inc. |
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2 | Contributed by Richard Henderson <rth@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 | |
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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 |
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14 | more details. |
| 15 | ||
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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> | |
| 28 | ||
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29 | |
| 30 | ||
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31 | static inline long |
| 32 | sys_futex0(int *addr, long op, int val) | |
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33 | { |
| 34 | register long out0 asm ("out0") = (long) addr; | |
| 35 | register long out1 asm ("out1") = op; | |
| 36 | register long out2 asm ("out2") = val; | |
| 37 | register long out3 asm ("out3") = 0; | |
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38 | register long r8 asm ("r8"); |
| 39 | register long r10 asm ("r10"); | |
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40 | register long r15 asm ("r15") = SYS_futex; |
| 41 | ||
| 42 | __asm __volatile ("break 0x100000" | |
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43 | : "=r"(r15), "=r"(out0), "=r"(out1), "=r"(out2), "=r"(out3), |
| 44 | "=r"(r8), "=r"(r10) | |
| 953ff289 | 45 | : "r"(r15), "r"(out0), "r"(out1), "r"(out2), "r"(out3) |
| a68ab351 | 46 | : "memory", "out4", "out5", "out6", "out7", |
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47 | /* Non-stacked integer registers, minus r8, r10, r15. */ |
| 48 | "r2", "r3", "r9", "r11", "r12", "r13", "r14", "r16", "r17", "r18", | |
| 49 | "r19", "r20", "r21", "r22", "r23", "r24", "r25", "r26", "r27", | |
| 50 | "r28", "r29", "r30", "r31", | |
| 51 | /* Predicate registers. */ | |
| 52 | "p6", "p7", "p8", "p9", "p10", "p11", "p12", "p13", "p14", "p15", | |
| 53 | /* Non-rotating fp registers. */ | |
| 54 | "f6", "f7", "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", | |
| 55 | /* Branch registers. */ | |
| 56 | "b6"); | |
| a68ab351 | 57 | return r8 & r10; |
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58 | } |
| 59 | ||
| 60 | static inline void | |
| 61 | futex_wait (int *addr, int val) | |
| 62 | { | |
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63 | long err = sys_futex0 (addr, gomp_futex_wait, val); |
| 64 | if (__builtin_expect (err == ENOSYS, 0)) | |
| 65 | { | |
| 66 | gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; | |
| 67 | gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; | |
| 68 | sys_futex0 (addr, gomp_futex_wait, val); | |
| 69 | } | |
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70 | } |
| 71 | ||
| 72 | static inline void | |
| 73 | futex_wake (int *addr, int count) | |
| 74 | { | |
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75 | long err = sys_futex0 (addr, gomp_futex_wake, count); |
| 76 | if (__builtin_expect (err == ENOSYS, 0)) | |
| 77 | { | |
| 78 | gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; | |
| 79 | gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; | |
| 80 | sys_futex0 (addr, gomp_futex_wake, count); | |
| 81 | } | |
| 82 | } | |
| 83 | ||
| 84 | static inline void | |
| 85 | cpu_relax (void) | |
| 86 | { | |
| 87 | __asm volatile ("hint @pause" : : : "memory"); | |
| 88 | } |