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
|
/* Copyright (C) 2000-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Maciej W. Rozycki <macro@ds2.pg.gda.pl>, 2000.
The GNU C Library 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.
The GNU C Library 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 the GNU C Library. If not, see
<https://www.gnu.org/licenses/>. */
#ifndef _SYS_TAS_H
#define _SYS_TAS_H 1
#include <features.h>
#include <sgidefs.h>
__BEGIN_DECLS
extern int _test_and_set (int *__p, int __v)
__THROW __attribute__ ((__nomips16__));
#ifdef __USE_EXTERN_INLINES
# ifndef _EXTERN_INLINE
# define _EXTERN_INLINE __extern_inline
# endif
_EXTERN_INLINE int __attribute__ ((__nomips16__))
__NTH (_test_and_set (int *__p, int __v))
{
int __r, __t;
/* The R5900 reports itself as MIPS III but it does not have LL/SC. */
__asm__ __volatile__
("/* Inline test and set */\n"
".set push\n\t"
#if _MIPS_SIM == _ABIO32 && (__mips < 2 || defined (_MIPS_ARCH_R5900))
".set mips2\n\t"
#endif
"sync\n\t"
"1:\n\t"
"ll %0,%3\n\t"
"move %1,%4\n\t"
"beq %0,%4,2f\n\t"
"sc %1,%2\n\t"
"beqz %1,1b\n"
"sync\n\t"
".set pop\n\t"
"2:\n\t"
"/* End test and set */"
: "=&r" (__r), "=&r" (__t), "=m" (*__p)
: "m" (*__p), "r" (__v)
: "memory");
return __r;
}
#endif /* __USE_EXTERN_INLINES */
__END_DECLS
#endif /* sys/tas.h */
|
