| 1 | /* SPDX-License-Identifier: MIT */ |
| 2 | /* SPDX-FileCopyrightText: 2021 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> */ |
| 3 | |
| 4 | /* |
| 5 | * rseq-x86-thread-pointer.h |
| 6 | */ |
| 7 | |
| 8 | #ifndef _RSEQ_X86_THREAD_POINTER |
| 9 | #define _RSEQ_X86_THREAD_POINTER |
| 10 | |
| 11 | #include <features.h> |
| 12 | |
| 13 | #ifdef __cplusplus |
| 14 | extern "C" { |
| 15 | #endif |
| 16 | |
| 17 | #if __GNUC_PREREQ (11, 1) |
| 18 | static inline void *rseq_thread_pointer(void) |
| 19 | { |
| 20 | return __builtin_thread_pointer(); |
| 21 | } |
| 22 | #else |
| 23 | static inline void *rseq_thread_pointer(void) |
| 24 | { |
| 25 | void *__result; |
| 26 | |
| 27 | # ifdef __x86_64__ |
| 28 | __asm__ ("mov %%fs:0, %0" : "=r" (__result)); |
| 29 | # else |
| 30 | __asm__ ("mov %%gs:0, %0" : "=r" (__result)); |
| 31 | # endif |
| 32 | return __result; |
| 33 | } |
| 34 | #endif /* !GCC 11 */ |
| 35 | |
| 36 | #ifdef __cplusplus |
| 37 | } |
| 38 | #endif |
| 39 | |
| 40 | #endif |