1 /* Thread-local storage handling in the ELF dynamic linker. 2 Copyright (C) 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 /* Type used for the representation of TLS information in the GOT. */ 20 typedef struct 21 { 22 unsigned long int ti_module; 23 unsigned long int ti_offset; 24 } tls_index; 25 26 /* The thread pointer points to the first static TLS block. */ 27 #define TLS_TP_OFFSET 0 28 29 /* Dynamic thread vector pointers point to the start of each 30 TLS block. */ 31 #define TLS_DTV_OFFSET 0 32 33 /* Compute the value for a GOTTPREL reloc. */ 34 #define TLS_TPREL_VALUE(sym_map, sym) \ 35 ((sym_map)->l_tls_offset + (sym)->st_value - TLS_TP_OFFSET) 36 37 /* Compute the value for a DTPREL reloc. */ 38 #define TLS_DTPREL_VALUE(sym) ((sym)->st_value - TLS_DTV_OFFSET) 39 40 extern void *__tls_get_addr (tls_index *ti); 41 42 #define GET_ADDR_OFFSET (ti->ti_offset + TLS_DTV_OFFSET) 43 #define __TLS_GET_ADDR(__ti) (__tls_get_addr (__ti) - TLS_DTV_OFFSET) 44 45 /* Value used for dtv entries for which the allocation is delayed. */ 46 #define TLS_DTV_UNALLOCATED ((void *) -1l) 47