1 /* Thread-local storage handling in the ELF dynamic linker. x86-64 version. 2 Copyright (C) 2017-2022 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 #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 hidden_ver(___tls_get_addr,__tls_get_addr)34hidden_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 size_t gen = atomic_load_relaxed (&GL(dl_tls_generation)); 44 if (__glibc_unlikely (dtv[0].counter != gen)) 45 return update_get_addr (GET_ADDR_PARAM); 46 47 return tls_get_addr_tail (GET_ADDR_PARAM, dtv, NULL); 48 } 49 #else 50 51 /* No compatibility symbol needed. */ 52 # include <elf/dl-tls.c> 53 54 #endif 55