/* Configuration of lookup functions. Copyright (C) 2000-2020 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library. If not, see <https://www.gnu.org/licenses/>. */ #define ELF_FUNCTION_PTR_IS_SPECIAL #define DL_UNMAP_IS_SPECIAL #include <dl-fptr.h> /* Forward declaration. */ struct link_map; void *_dl_symbol_address (struct link_map *map, const ElfW(Sym) *ref); rtld_hidden_proto (_dl_symbol_address) #define DL_SYMBOL_ADDRESS(map, ref) _dl_symbol_address(map, ref) Elf32_Addr _dl_lookup_address (const void *address); #define DL_LOOKUP_ADDRESS(addr) _dl_lookup_address ((const void *) addr) void attribute_hidden _dl_unmap (struct link_map *map); #define DL_UNMAP(map) _dl_unmap (map) #define DL_DT_FUNCTION_ADDRESS(map, start, attr, addr) \ attr volatile unsigned int fptr[2]; \ /* The test for "start & 2" below is to accommodate old binaries which \ violated the ELF ABI by pointing DT_INIT and DT_FINI at a function \ descriptor. */ \ if ((ElfW(Addr)) (start) & 2) \ addr = (ElfW(Addr)) start; \ else \ { \ fptr[0] = (unsigned int) (start); \ fptr[1] = (map)->l_info[DT_PLTGOT]->d_un.d_ptr; \ /* Set bit 30 to indicate to $$dyncall that this is a PLABEL. */ \ addr = (ElfW(Addr))((unsigned int)fptr | 2); \ } \ #define DL_CALL_DT_INIT(map, start, argc, argv, env) \ { \ ElfW(Addr) addr; \ DL_DT_FUNCTION_ADDRESS(map, start, , addr) \ init_t init = (init_t) addr; \ init (argc, argv, env); \ } #define DL_CALL_DT_FINI(map, start) \ { \ ElfW(Addr) addr; \ DL_DT_FUNCTION_ADDRESS(map, start, , addr) \ fini_t fini = (fini_t) addr; \ fini (); \ } /* The type of the return value of fixup/profile_fixup */ #define DL_FIXUP_VALUE_TYPE struct fdesc /* Construct a fixup value from the address and linkmap */ #define DL_FIXUP_MAKE_VALUE(map, addr) \ (map) ? ((struct fdesc) { (addr), (map)->l_info[DT_PLTGOT]->d_un.d_ptr }) \ : ((struct fdesc) { 0, 0 }) /* Extract the code address from a fixup value */ #define DL_FIXUP_VALUE_CODE_ADDR(value) ((value).ip) #define DL_FIXUP_VALUE_ADDR(value) ((uintptr_t) &(value)) #define DL_FIXUP_ADDR_VALUE(addr) (*(struct fdesc *) (addr))