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8d9254fc | 1 | /* Copyright (C) 2005-2020 Free Software Foundation, Inc. |
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2 | Contributed by Richard Henderson <rth@redhat.com>. |
3 | ||
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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 | #ifndef SYS_futex | |
29 | #define SYS_futex 394 | |
30 | #endif | |
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31 | |
32 | ||
33 | static inline void | |
34 | futex_wait (int *addr, int val) | |
35 | { | |
36 | register long sc_0 __asm__("$0"); | |
37 | register long sc_16 __asm__("$16"); | |
38 | register long sc_17 __asm__("$17"); | |
39 | register long sc_18 __asm__("$18"); | |
40 | register long sc_19 __asm__("$19"); | |
41 | ||
42 | sc_0 = SYS_futex; | |
43 | sc_16 = (long) addr; | |
a68ab351 | 44 | sc_17 = gomp_futex_wait; |
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45 | sc_18 = val; |
46 | sc_19 = 0; | |
47 | __asm volatile ("callsys" | |
48 | : "=r" (sc_0), "=r"(sc_19) | |
49 | : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18), "1"(sc_19) | |
50 | : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", | |
51 | "$22", "$23", "$24", "$25", "$27", "$28", "memory"); | |
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52 | if (__builtin_expect (sc_19, 0) && sc_0 == ENOSYS) |
53 | { | |
54 | gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; | |
55 | gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; | |
56 | sc_0 = SYS_futex; | |
57 | sc_17 &= ~FUTEX_PRIVATE_FLAG; | |
58 | sc_19 = 0; | |
59 | __asm volatile ("callsys" | |
60 | : "=r" (sc_0), "=r"(sc_19) | |
61 | : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18), | |
62 | "1"(sc_19) | |
63 | : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", | |
64 | "$22", "$23", "$24", "$25", "$27", "$28", "memory"); | |
65 | } | |
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66 | } |
67 | ||
68 | static inline void | |
69 | futex_wake (int *addr, int count) | |
70 | { | |
71 | register long sc_0 __asm__("$0"); | |
72 | register long sc_16 __asm__("$16"); | |
73 | register long sc_17 __asm__("$17"); | |
74 | register long sc_18 __asm__("$18"); | |
75 | register long sc_19 __asm__("$19"); | |
76 | ||
77 | sc_0 = SYS_futex; | |
78 | sc_16 = (long) addr; | |
a68ab351 | 79 | sc_17 = gomp_futex_wake; |
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80 | sc_18 = count; |
81 | __asm volatile ("callsys" | |
82 | : "=r" (sc_0), "=r"(sc_19) | |
83 | : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18) | |
84 | : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", | |
85 | "$22", "$23", "$24", "$25", "$27", "$28", "memory"); | |
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86 | if (__builtin_expect (sc_19, 0) && sc_0 == ENOSYS) |
87 | { | |
88 | gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; | |
89 | gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; | |
90 | sc_0 = SYS_futex; | |
91 | sc_17 &= ~FUTEX_PRIVATE_FLAG; | |
92 | __asm volatile ("callsys" | |
93 | : "=r" (sc_0), "=r"(sc_19) | |
94 | : "0"(sc_0), "r" (sc_16), "r"(sc_17), "r"(sc_18) | |
95 | : "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8", | |
96 | "$22", "$23", "$24", "$25", "$27", "$28", "memory"); | |
97 | } | |
98 | } | |
99 | ||
100 | static inline void | |
101 | cpu_relax (void) | |
102 | { | |
103 | __asm volatile ("" : : : "memory"); | |
104 | } |