1 /* Configuration of lookup functions. 2 Copyright (C) 2000-2022 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 #define ELF_FUNCTION_PTR_IS_SPECIAL 20 #define DL_UNMAP_IS_SPECIAL 21 22 #include <dl-fptr.h> 23 24 /* We do not support copy relocations for IA-64. */ 25 #define DL_NO_COPY_RELOCS 26 27 /* Forward declaration. */ 28 struct link_map; 29 30 extern void *_dl_symbol_address (struct link_map *map, const Elf64_Sym *ref); 31 rtld_hidden_proto (_dl_symbol_address) 32 33 #define DL_SYMBOL_ADDRESS(map, ref) _dl_symbol_address(map, ref) 34 35 extern Elf64_Addr _dl_lookup_address (const void *address); 36 37 #define DL_LOOKUP_ADDRESS(addr) _dl_lookup_address (addr) 38 39 extern void attribute_hidden _dl_unmap (struct link_map *map); 40 41 #define DL_UNMAP(map) _dl_unmap (map) 42 43 #define DL_DT_FUNCTION_ADDRESS(map, start, attr, addr) \ 44 attr volatile unsigned long int fptr[2]; \ 45 fptr[0] = (unsigned long int) (start); \ 46 fptr[1] = (map)->l_info[DT_PLTGOT]->d_un.d_ptr; \ 47 addr = (ElfW(Addr)) fptr; \ 48 49 #define DL_CALL_DT_INIT(map, start, argc, argv, env) \ 50 { \ 51 ElfW(Addr) addr; \ 52 DL_DT_FUNCTION_ADDRESS(map, start, , addr) \ 53 dl_init_t init = (dl_init_t) addr; \ 54 init (argc, argv, env); \ 55 } 56 57 #define DL_CALL_DT_FINI(map, start) \ 58 { \ 59 ElfW(Addr) addr; \ 60 DL_DT_FUNCTION_ADDRESS(map, start, , addr) \ 61 fini_t fini = (fini_t) addr; \ 62 fini (); \ 63 } 64 65 /* The type of the return value of fixup/profile_fixup. */ 66 #define DL_FIXUP_VALUE_TYPE struct fdesc 67 /* Construct a value of type DL_FIXUP_VALUE_TYPE from a code address 68 and a link map. */ 69 #define DL_FIXUP_MAKE_VALUE(map, addr) \ 70 ((struct fdesc) { (addr), (map)->l_info[DT_PLTGOT]->d_un.d_ptr }) 71 /* Extract the code address from a value of type DL_FIXUP_MAKE_VALUE. 72 */ 73 #define DL_FIXUP_VALUE_CODE_ADDR(value) (value).ip 74 75 #define DL_FIXUP_VALUE_ADDR(value) ((uintptr_t) &(value)) 76 #define DL_FIXUP_ADDR_VALUE(addr) (*(struct fdesc *) (addr)) 77 #define DL_FIXUP_BINDNOW_ADDR_VALUE(addr) (addr) 78 #define DL_FIXUP_BINDNOW_RELOC(value, new_value, st_value) \ 79 (*value) = *(struct fdesc *) (st_value) 80