145
|
1 /* Copyright (C) 2005-2020 Free Software Foundation, Inc.
|
0
|
2 Contributed by Richard Henderson <rth@redhat.com>.
|
|
3
|
111
|
4 This file is part of the GNU Offloading and Multi Processing Library
|
|
5 (libgomp).
|
0
|
6
|
|
7 Libgomp is free software; you can redistribute it and/or modify it
|
|
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.
|
|
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
|
|
14 FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
15 more details.
|
|
16
|
|
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/>. */
|
|
25
|
|
26 /* Provide target-specific access to the futex system call. */
|
|
27
|
|
28 #include <sys/syscall.h>
|
|
29
|
|
30
|
|
31
|
|
32 static inline long
|
111
|
33 sys_futex0(int *addr, int op, int val)
|
0
|
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;
|
|
39 register long r8 asm ("r8");
|
|
40 register long r10 asm ("r10");
|
|
41 register long r15 asm ("r15") = SYS_futex;
|
|
42
|
|
43 __asm __volatile ("break 0x100000"
|
|
44 : "=r"(r15), "=r"(out0), "=r"(out1), "=r"(out2), "=r"(out3),
|
|
45 "=r"(r8), "=r"(r10)
|
|
46 : "r"(r15), "r"(out0), "r"(out1), "r"(out2), "r"(out3)
|
|
47 : "memory", "out4", "out5", "out6", "out7",
|
145
|
48 /* Non-stacked integer registers, minus r8, r10, r12, r15. */
|
|
49 "r2", "r3", "r9", "r11", "r13", "r14", "r16", "r17", "r18",
|
0
|
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");
|
|
58 return r8 & r10;
|
|
59 }
|
|
60
|
|
61 static inline void
|
|
62 futex_wait (int *addr, int val)
|
|
63 {
|
|
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 }
|
|
71 }
|
|
72
|
|
73 static inline void
|
|
74 futex_wake (int *addr, int count)
|
|
75 {
|
|
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 }
|