| 1 | /* __thread_pointer definition. x86 version. |
|---|
| 2 | Copyright (C) 2021-2022 Free Software Foundation, Inc. |
|---|
| 3 | This file is part of the GNU C Library. |
|---|
| 4 | |
|---|
| 5 | The GNU C Library is free software; you can redistribute it and/or |
|---|
| 6 | modify it under the terms of the GNU Lesser General Public |
|---|
| 7 | License as published by the Free Software Foundation; either |
|---|
| 8 | version 2.1 of the License, or (at your option) any later version. |
|---|
| 9 | |
|---|
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
|---|
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
|---|
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|---|
| 13 | Lesser General Public License for more details. |
|---|
| 14 | |
|---|
| 15 | You should have received a copy of the GNU Lesser General Public |
|---|
| 16 | License along with the GNU C Library. If not, see |
|---|
| 17 | <https://www.gnu.org/licenses/>. */ |
|---|
| 18 | |
|---|
| 19 | #ifndef _SYS_THREAD_POINTER_H |
|---|
| 20 | #define _SYS_THREAD_POINTER_H |
|---|
| 21 | |
|---|
| 22 | static inline void * |
|---|
| 23 | __thread_pointer (void) |
|---|
| 24 | { |
|---|
| 25 | #if __GNUC_PREREQ (11, 1) |
|---|
| 26 | return __builtin_thread_pointer (); |
|---|
| 27 | #else |
|---|
| 28 | void *__result; |
|---|
| 29 | # ifdef __x86_64__ |
|---|
| 30 | __asm__ ("mov %%fs:0, %0" : "=r" (__result)); |
|---|
| 31 | # else |
|---|
| 32 | __asm__ ("mov %%gs:0, %0" : "=r" (__result)); |
|---|
| 33 | # endif |
|---|
| 34 | return __result; |
|---|
| 35 | #endif /* !GCC 11 */ |
|---|
| 36 | } |
|---|
| 37 | |
|---|
| 38 | #endif /* _SYS_THREAD_POINTER_H */ |
|---|
| 39 | |
|---|
