1/* Copyright (C) 2000-2025 Free Software Foundation, Inc.
 2   This file is part of the GNU C Library.
 3
 4   The GNU C Library is free software; you can redistribute it and/or
 5   modify it under the terms of the GNU Lesser General Public
 6   License as published by the Free Software Foundation; either
 7   version 2.1 of the License, or (at your option) any later version.
 8
 9   The GNU C Library is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12   Lesser General Public License for more details.
13
14   You should have received a copy of the GNU Lesser General Public
15   License along with the GNU C Library.  If not, see
16   <https://www.gnu.org/licenses/>.  */
17
18#ifndef _SYS_TAS_H
19#define _SYS_TAS_H 1
20
21#include <features.h>
22#include <sgidefs.h>
23
24__BEGIN_DECLS
25
26extern int _test_and_set (int *__p, int __v)
27     __THROW __attribute__ ((__nomips16__));
28
29#ifdef __USE_EXTERN_INLINES
30
31# ifndef _EXTERN_INLINE
32#  define _EXTERN_INLINE __extern_inline
33# endif
34
35_EXTERN_INLINE int __attribute__ ((__nomips16__))
36__NTH (_test_and_set (int *__p, int __v))
37{
38  int __r, __t;
39
40  /* The R5900 reports itself as MIPS III but it does not have LL/SC.  */
41  __asm__ __volatile__
42    ("/* Inline test and set */\n"
43     ".set	push\n\t"
44#if _MIPS_SIM == _ABIO32 && (__mips < 2 || defined (_MIPS_ARCH_R5900))
45     ".set	mips2\n\t"
46#endif
47     "sync\n\t"
48     "1:\n\t"
49     "ll	%0,%3\n\t"
50     "move	%1,%4\n\t"
51     "beq	%0,%4,2f\n\t"
52     "sc	%1,%2\n\t"
53     "beqz	%1,1b\n"
54     "sync\n\t"
55     ".set	pop\n\t"
56     "2:\n\t"
57     "/* End test and set */"
58     : "=&r" (__r), "=&r" (__t), "=m" (*__p)
59     : "m" (*__p), "r" (__v)
60     : "memory");
61
62  return __r;
63}
64
65#endif /* __USE_EXTERN_INLINES */
66
67__END_DECLS
68
69#endif /* sys/tas.h */