| /* Configuration of lookup functions. |
| Copyright (C) 2000-2018 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 |
| <http://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)) |