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031e519c | 1 | /* Thread-local storage handling in the ELF dynamic linker. x86-64 version. |
d614a753 | 2 | Copyright (C) 2017-2020 Free Software Foundation, Inc. |
031e519c L |
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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
031e519c L |
18 | |
19 | #ifdef SHARED | |
20 | /* Work around GCC PR58066, due to which __tls_get_addr may be called | |
21 | with an unaligned stack. The compat implementation is in | |
22 | tls_get_addr-compat.S. */ | |
23 | ||
24 | # include <dl-tls.h> | |
25 | ||
26 | /* Define __tls_get_addr within elf/dl-tls.c under a different | |
27 | name. */ | |
28 | extern __typeof__ (__tls_get_addr) ___tls_get_addr; | |
29 | ||
30 | # define __tls_get_addr ___tls_get_addr | |
31 | # include <elf/dl-tls.c> | |
32 | # undef __tls_get_addr | |
33 | ||
34 | hidden_ver (___tls_get_addr, __tls_get_addr) | |
35 | ||
36 | /* Only handle slow paths for __tls_get_addr. */ | |
37 | attribute_hidden | |
38 | void * | |
39 | __tls_get_addr_slow (GET_ADDR_ARGS) | |
40 | { | |
41 | dtv_t *dtv = THREAD_DTV (); | |
42 | ||
43 | if (__glibc_unlikely (dtv[0].counter != GL(dl_tls_generation))) | |
44 | return update_get_addr (GET_ADDR_PARAM); | |
45 | ||
46 | return tls_get_addr_tail (GET_ADDR_PARAM, dtv, NULL); | |
47 | } | |
48 | #else | |
49 | ||
50 | /* No compatibility symbol needed. */ | |
51 | # include <elf/dl-tls.c> | |
52 | ||
53 | #endif |