1 /* Thread-local storage descriptor handling in the ELF dynamic linker. 2 x86_64 version. 3 Copyright (C) 2005-2021 Free Software Foundation, Inc. 4 This file is part of the GNU C Library. 5 6 The GNU C Library is free software; you can redistribute it and/or 7 modify it under the terms of the GNU Lesser General Public 8 License as published by the Free Software Foundation; either 9 version 2.1 of the License, or (at your option) any later version. 10 11 The GNU C Library is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 Lesser General Public License for more details. 15 16 You should have received a copy of the GNU Lesser General Public 17 License along with the GNU C Library; if not, see 18 <https://www.gnu.org/licenses/>. */ 19 20 #include <stdint.h> 21 22 #ifndef _X86_64_DL_TLSDESC_H 23 # define _X86_64_DL_TLSDESC_H 1 24 25 /* Type used to represent a TLS descriptor in the GOT. */ 26 struct tlsdesc 27 { 28 /* Anonymous union is used here to ensure that GOT entry slot is always 29 8 bytes for both x32 and x86-64. */ 30 union 31 { 32 ptrdiff_t (*entry) (struct tlsdesc *on_rax); 33 uint64_t entry_slot; 34 }; 35 union 36 { 37 void *arg; 38 uint64_t arg_slot; 39 }; 40 }; 41 42 typedef struct dl_tls_index 43 { 44 uint64_t ti_module; 45 uint64_t ti_offset; 46 } tls_index; 47 48 /* Type used as the argument in a TLS descriptor for a symbol that 49 needs dynamic TLS offsets. */ 50 struct tlsdesc_dynamic_arg 51 { 52 tls_index tlsinfo; 53 size_t gen_count; 54 }; 55 56 extern ptrdiff_t attribute_hidden 57 _dl_tlsdesc_return(struct tlsdesc *on_rax), 58 _dl_tlsdesc_undefweak(struct tlsdesc *on_rax); 59 60 # ifdef SHARED 61 extern void *_dl_make_tlsdesc_dynamic (struct link_map *map, 62 size_t ti_offset) 63 attribute_hidden; 64 65 extern ptrdiff_t attribute_hidden _dl_tlsdesc_dynamic(struct tlsdesc *); 66 # endif 67 68 #endif 69