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 *
__thread_pointer(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