mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2025-01-12 08:45:11 +08:00
ae31573843
Introduce a rseq-x86-bits.h template header which is internally included to generate the static inline functions covering: - relaxed and release memory ordering, - per-cpu-id and per-mm-cid per-cpu data access. This introduces changes to the rseq.h selftests API which require to update the rseq selftest programs. Similar API/templating changes need to be done for other architectures. Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20221122203932.231377-12-mathieu.desnoyers@efficios.com
37 lines
1.1 KiB
C
37 lines
1.1 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-only OR MIT */
|
|
/*
|
|
* rseq/compiler.h
|
|
*
|
|
* Work-around asm goto compiler bugs.
|
|
*
|
|
* (C) Copyright 2021 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
|
|
*/
|
|
|
|
#ifndef RSEQ_COMPILER_H
|
|
#define RSEQ_COMPILER_H
|
|
|
|
/*
|
|
* gcc prior to 4.8.2 miscompiles asm goto.
|
|
* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670
|
|
*
|
|
* gcc prior to 8.1.0 miscompiles asm goto at O1.
|
|
* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103908
|
|
*
|
|
* clang prior to version 13.0.1 miscompiles asm goto at O2.
|
|
* https://github.com/llvm/llvm-project/issues/52735
|
|
*
|
|
* Work around these issues by adding a volatile inline asm with
|
|
* memory clobber in the fallthrough after the asm goto and at each
|
|
* label target. Emit this for all compilers in case other similar
|
|
* issues are found in the future.
|
|
*/
|
|
#define rseq_after_asm_goto() asm volatile ("" : : : "memory")
|
|
|
|
/* Combine two tokens. */
|
|
#define RSEQ__COMBINE_TOKENS(_tokena, _tokenb) \
|
|
_tokena##_tokenb
|
|
#define RSEQ_COMBINE_TOKENS(_tokena, _tokenb) \
|
|
RSEQ__COMBINE_TOKENS(_tokena, _tokenb)
|
|
|
|
#endif /* RSEQ_COMPILER_H_ */
|