blob: 450f2dcca3148529d0a3871f98d9d1a398e380b3 (
plain)
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
|
/* RSEQ_* accessors. Generic version.
Copyright (C) 2002-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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/>. */
#include <atomic.h>
/* Read member of the RSEQ area directly. */
#define RSEQ_GETMEM(member) \
RSEQ_SELF()->member
/* Set member of the RSEQ area directly. */
#define RSEQ_SETMEM(member, value) \
RSEQ_SELF()->member = (value)
/* Static assert for types that can't be loaded/stored atomically on the
current architecture. */
#if __HAVE_64B_ATOMICS
#define __RSEQ_ASSERT_ATOMIC(member) \
_Static_assert (sizeof (RSEQ_SELF()->member) == 1 \
|| sizeof (RSEQ_SELF()->member) == 4 \
|| sizeof (RSEQ_SELF()->member) == 8, \
"size of rseq data")
#else
#define __RSEQ_ASSERT_ATOMIC(member) \
_Static_assert (sizeof (RSEQ_SELF()->member) == 1 \
|| sizeof (RSEQ_SELF()->member) == 4, \
"size of rseq data")
#endif
/* Read member of the RSEQ area directly, with single-copy atomicity semantics. */
#define RSEQ_GETMEM_ONCE(member) \
({ \
__RSEQ_ASSERT_ATOMIC(member); \
(*(volatile __typeof (RSEQ_SELF()->member) *)&RSEQ_SELF()->member); \
})
/* Set member of the RSEQ area directly, with single-copy atomicity semantics. */
#define RSEQ_SETMEM_ONCE(member, value) \
({ \
__RSEQ_ASSERT_ATOMIC(member); \
(*(volatile __typeof (RSEQ_SELF()->member) *)&RSEQ_SELF()->member = (value)); \
})
|
