| /* 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_ */ |