projects / thirdparty / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| 7adcbafe | 1 | /* Copyright (C) 2005-2022 Free Software Foundation, Inc. |
| 953ff289 DN |
2 | Contributed by Richard Henderson <rth@redhat.com>. |
| 3 | ||
| f1f3453e TS |
4 | This file is part of the GNU Offloading and Multi Processing Library |
| 5 | (libgomp). | |
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6 | |
| 7 | Libgomp is free software; you can redistribute it and/or modify it | |
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8 | under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3, or (at your option) | |
| 10 | any later version. | |
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11 | |
| 12 | Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
| 748086b7 | 14 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
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15 | more details. |
| 16 | ||
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17 | Under Section 7 of GPL version 3, you are granted additional |
| 18 | permissions described in the GCC Runtime Library Exception, version | |
| 19 | 3.1, as published by the Free Software Foundation. | |
| 20 | ||
| 21 | You should have received a copy of the GNU General Public License and | |
| 22 | a copy of the GCC Runtime Library Exception along with this program; | |
| 23 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
| 24 | <http://www.gnu.org/licenses/>. */ | |
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25 | |
| 26 | /* Provide target-specific access to the futex system call. */ | |
| 27 | ||
| 28 | #include <sys/syscall.h> | |
| 953ff289 | 29 | |
| a68ab351 | 30 | static inline long |
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31 | sys_futex0 (int *addr, int op, int val) |
| 32 | { | |
| 33 | register long int r0 __asm__ ("r0"); | |
| 34 | register long int r3 __asm__ ("r3"); | |
| 35 | register long int r4 __asm__ ("r4"); | |
| 36 | register long int r5 __asm__ ("r5"); | |
| 37 | register long int r6 __asm__ ("r6"); | |
| 38 | ||
| 39 | r0 = SYS_futex; | |
| 40 | r3 = (long) addr; | |
| 41 | r4 = op; | |
| 42 | r5 = val; | |
| 43 | r6 = 0; | |
| 44 | ||
| 45 | /* ??? The powerpc64 sysdep.h file clobbers ctr; the powerpc32 sysdep.h | |
| 46 | doesn't. It doesn't much matter for us. In the interest of unity, | |
| 47 | go ahead and clobber it always. */ | |
| 48 | ||
| a68ab351 | 49 | __asm volatile ("sc; mfcr %0" |
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50 | : "=r"(r0), "=r"(r3), "=r"(r4), "=r"(r5), "=r"(r6) |
| 51 | : "r"(r0), "r"(r3), "r"(r4), "r"(r5), "r"(r6) | |
| 52 | : "r7", "r8", "r9", "r10", "r11", "r12", | |
| 53 | "cr0", "ctr", "memory"); | |
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54 | if (__builtin_expect (r0 & (1 << 28), 0)) |
| 55 | return r3; | |
| 56 | return 0; | |
| 953ff289 DN |
57 | } |
| 58 | ||
| 59 | static inline void | |
| 60 | futex_wait (int *addr, int val) | |
| 61 | { | |
| a68ab351 JJ |
62 | long err = sys_futex0 (addr, gomp_futex_wait, val); |
| 63 | if (__builtin_expect (err == ENOSYS, 0)) | |
| 64 | { | |
| 65 | gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; | |
| 66 | gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; | |
| 67 | sys_futex0 (addr, gomp_futex_wait, val); | |
| 68 | } | |
| 953ff289 DN |
69 | } |
| 70 | ||
| 71 | static inline void | |
| 72 | futex_wake (int *addr, int count) | |
| 73 | { | |
| a68ab351 JJ |
74 | long err = sys_futex0 (addr, gomp_futex_wake, count); |
| 75 | if (__builtin_expect (err == ENOSYS, 0)) | |
| 76 | { | |
| 77 | gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; | |
| 78 | gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; | |
| 79 | sys_futex0 (addr, gomp_futex_wake, count); | |
| 80 | } | |
| 81 | } | |
| 82 | ||
| 83 | static inline void | |
| 84 | cpu_relax (void) | |
| 85 | { | |
| 86 | __asm volatile ("" : : : "memory"); | |
| 87 | } |