1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
/* Copyright (C) 2005, 2008 Free Software Foundation, Inc.
Contributed by Richard Henderson <rth@redhat.com>.
This file is part of the GNU OpenMP Library (libgomp).
Libgomp is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
more details.
You should have received a copy of the GNU Lesser General Public License
along with libgomp; see the file COPYING.LIB. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA. */
/* As a special exception, if you link this library with other files, some
of which are compiled with GCC, to produce an executable, this library
does not by itself cause the resulting executable to be covered by the
GNU General Public License. This exception does not however invalidate
any other reasons why the executable file might be covered by the GNU
General Public License. */
/* Provide target-specific access to the futex system call. */
#include <sys/syscall.h>
static inline long
sys_futex0(int *addr, long op, int val)
{
register long out0 asm ("out0") = (long) addr;
register long out1 asm ("out1") = op;
register long out2 asm ("out2") = val;
register long out3 asm ("out3") = 0;
register long r8 asm ("r8");
register long r10 asm ("r10");
register long r15 asm ("r15") = SYS_futex;
__asm __volatile ("break 0x100000"
: "=r"(r15), "=r"(out0), "=r"(out1), "=r"(out2), "=r"(out3),
"=r"(r8), "=r"(r10)
: "r"(r15), "r"(out0), "r"(out1), "r"(out2), "r"(out3)
: "memory", "out4", "out5", "out6", "out7",
/* Non-stacked integer registers, minus r8, r10, r15. */
"r2", "r3", "r9", "r11", "r12", "r13", "r14", "r16", "r17", "r18",
"r19", "r20", "r21", "r22", "r23", "r24", "r25", "r26", "r27",
"r28", "r29", "r30", "r31",
/* Predicate registers. */
"p6", "p7", "p8", "p9", "p10", "p11", "p12", "p13", "p14", "p15",
/* Non-rotating fp registers. */
"f6", "f7", "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
/* Branch registers. */
"b6");
return r8 & r10;
}
static inline void
futex_wait (int *addr, int val)
{
long err = sys_futex0 (addr, gomp_futex_wait, val);
if (__builtin_expect (err == ENOSYS, 0))
{
gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
sys_futex0 (addr, gomp_futex_wait, val);
}
}
static inline void
futex_wake (int *addr, int count)
{
long err = sys_futex0 (addr, gomp_futex_wake, count);
if (__builtin_expect (err == ENOSYS, 0))
{
gomp_futex_wait &= ~FUTEX_PRIVATE_FLAG;
gomp_futex_wake &= ~FUTEX_PRIVATE_FLAG;
sys_futex0 (addr, gomp_futex_wake, count);
}
}
static inline void
cpu_relax (void)
{
__asm volatile ("hint @pause" : : : "memory");
}
static inline void
atomic_write_barrier (void)
{
__sync_synchronize ();
}
|
