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- /* RSEQ_* accessors. Generic version.
- Copyright (C) 2002-2026 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)); \
- })
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