| 1 | /* __thread_pointer definition. x86 version. |
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| 2 | Copyright (C) 2021-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library. If not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #ifndef _SYS_THREAD_POINTER_H |
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| 20 | #define _SYS_THREAD_POINTER_H |
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| 21 | |
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| 22 | static inline void * |
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| 23 | __thread_pointer (void) |
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| 24 | { |
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| 25 | #if __GNUC_PREREQ (11, 1) |
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| 26 | return __builtin_thread_pointer (); |
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| 27 | #else |
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| 28 | void *__result; |
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| 29 | # ifdef __x86_64__ |
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| 30 | __asm__ ("mov %%fs:0, %0" : "=r" (__result)); |
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| 31 | # else |
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| 32 | __asm__ ("mov %%gs:0, %0" : "=r" (__result)); |
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| 33 | # endif |
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| 34 | return __result; |
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| 35 | #endif /* !GCC 11 */ |
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| 36 | } |
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| 37 | |
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| 38 | #endif /* _SYS_THREAD_POINTER_H */ |
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| 39 | |
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