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85ec4feb | 1 | /* Copyright (C) 2005-2018 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 | #include <sys/syscall.h> | |
29 | ||
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30 | |
31 | ||
a68ab351 | 32 | static inline long |
8ed501f1 | 33 | sys_futex0(int *addr, int op, int val) |
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34 | { |
35 | register long out0 asm ("out0") = (long) addr; | |
36 | register long out1 asm ("out1") = op; | |
37 | register long out2 asm ("out2") = val; | |
38 | register long out3 asm ("out3") = 0; | |
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39 | register long r8 asm ("r8"); |
40 | register long r10 asm ("r10"); | |
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41 | register long r15 asm ("r15") = SYS_futex; |
42 | ||
43 | __asm __volatile ("break 0x100000" | |
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44 | : "=r"(r15), "=r"(out0), "=r"(out1), "=r"(out2), "=r"(out3), |
45 | "=r"(r8), "=r"(r10) | |
953ff289 | 46 | : "r"(r15), "r"(out0), "r"(out1), "r"(out2), "r"(out3) |
a68ab351 | 47 | : "memory", "out4", "out5", "out6", "out7", |
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48 | /* Non-stacked integer registers, minus r8, r10, r15. */ |
49 | "r2", "r3", "r9", "r11", "r12", "r13", "r14", "r16", "r17", "r18", | |
50 | "r19", "r20", "r21", "r22", "r23", "r24", "r25", "r26", "r27", | |
51 | "r28", "r29", "r30", "r31", | |
52 | /* Predicate registers. */ | |
53 | "p6", "p7", "p8", "p9", "p10", "p11", "p12", "p13", "p14", "p15", | |
54 | /* Non-rotating fp registers. */ | |
55 | "f6", "f7", "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15", | |
56 | /* Branch registers. */ | |
57 | "b6"); | |
a68ab351 | 58 | return r8 & r10; |
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59 | } |
60 | ||
61 | static inline void | |
62 | futex_wait (int *addr, int val) | |
63 | { | |
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64 | long err = sys_futex0 (addr, gomp_futex_wait, val); |
65 | if (__builtin_expect (err == ENOSYS, 0)) | |
66 | { | |
67 | gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; | |
68 | gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; | |
69 | sys_futex0 (addr, gomp_futex_wait, val); | |
70 | } | |
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71 | } |
72 | ||
73 | static inline void | |
74 | futex_wake (int *addr, int count) | |
75 | { | |
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76 | long err = sys_futex0 (addr, gomp_futex_wake, count); |
77 | if (__builtin_expect (err == ENOSYS, 0)) | |
78 | { | |
79 | gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG; | |
80 | gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG; | |
81 | sys_futex0 (addr, gomp_futex_wake, count); | |
82 | } | |
83 | } | |
84 | ||
85 | static inline void | |
86 | cpu_relax (void) | |
87 | { | |
88 | __asm volatile ("hint @pause" : : : "memory"); | |
89 | } |