projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 6f8cfde3 | 1 | /* Configuration of lookup functions. |
| b168057a | 2 | Copyright (C) 2000-2015 Free Software Foundation, Inc. |
| 6f8cfde3 UD |
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 | |
| 3214b89b AJ |
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. | |
| 6f8cfde3 UD |
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 | |
| 3214b89b | 13 | Lesser General Public License for more details. |
| 6f8cfde3 | 14 | |
| 3214b89b | 15 | You should have received a copy of the GNU Lesser General Public |
| ab84e3ff PE |
16 | License along with the GNU C Library. If not, see |
| 17 | <http://www.gnu.org/licenses/>. */ | |
| 6f8cfde3 | 18 | |
| 6f8cfde3 UD |
19 | #define ELF_FUNCTION_PTR_IS_SPECIAL |
| 20 | #define DL_UNMAP_IS_SPECIAL | |
| 21 | ||
| 084442fc CD |
22 | #include <dl-fptr.h> |
| 23 | ||
| a3a247a8 UD |
24 | /* Forward declaration. */ |
| 25 | struct link_map; | |
| 26 | ||
| 69751d3f | 27 | void *_dl_symbol_address (struct link_map *map, const ElfW(Sym) *ref); |
| 6f8cfde3 UD |
28 | |
| 29 | #define DL_SYMBOL_ADDRESS(map, ref) _dl_symbol_address(map, ref) | |
| 30 | ||
| 31 | Elf32_Addr _dl_lookup_address (const void *address); | |
| 32 | ||
| 69751d3f UD |
33 | /* Clear the bottom two bits so generic code can find the fdesc entry */ |
| 34 | #define DL_LOOKUP_ADDRESS(addr) \ | |
| 35 | (_dl_lookup_address ((void *)((unsigned long)addr & ~3))) | |
| 6f8cfde3 UD |
36 | |
| 37 | void _dl_unmap (struct link_map *map); | |
| 38 | ||
| 39 | #define DL_UNMAP(map) _dl_unmap (map) | |
| 85ff0834 | 40 | |
| daf75146 GM |
41 | #define DL_DT_FUNCTION_ADDRESS(map, start, attr, addr) \ |
| 42 | attr volatile unsigned int fptr[2]; \ | |
| 43 | /* The test for "start & 2" below is to accommodate old binaries which \ | |
| 44 | violated the ELF ABI by pointing DT_INIT and DT_FINI at a function \ | |
| 45 | descriptor. */ \ | |
| 46 | if ((ElfW(Addr)) (start) & 2) \ | |
| 47 | addr = (ElfW(Addr)) start; \ | |
| 48 | else \ | |
| 49 | { \ | |
| 50 | fptr[0] = (unsigned int) (start); \ | |
| 51 | fptr[1] = (map)->l_info[DT_PLTGOT]->d_un.d_ptr; \ | |
| 52 | /* Set bit 30 to indicate to $$dyncall that this is a PLABEL. */ \ | |
| 53 | addr = (ElfW(Addr))((unsigned int)fptr | 2); \ | |
| 54 | } \ | |
| 55 | ||
| 56 | #define DL_CALL_DT_INIT(map, start, argc, argv, env) \ | |
| 57 | { \ | |
| 58 | ElfW(Addr) addr; \ | |
| 59 | DL_DT_FUNCTION_ADDRESS(map, start, , addr) \ | |
| 60 | init_t init = (init_t) addr; \ | |
| 61 | init (argc, argv, env); \ | |
| 62 | } | |
| 63 | ||
| 64 | #define DL_CALL_DT_FINI(map, start) \ | |
| 65 | { \ | |
| 66 | ElfW(Addr) addr; \ | |
| 67 | DL_DT_FUNCTION_ADDRESS(map, start, , addr) \ | |
| 68 | fini_t fini = (fini_t) addr; \ | |
| 69 | fini (); \ | |
| 70 | } | |
| 084442fc CD |
71 | |
| 72 | /* The type of the return value of fixup/profile_fixup */ | |
| 73 | #define DL_FIXUP_VALUE_TYPE struct fdesc | |
| 74 | ||
| 75 | /* Construct a fixup value from the address and linkmap */ | |
| 76 | #define DL_FIXUP_MAKE_VALUE(map, addr) \ | |
| 77 | ((struct fdesc) { (addr), (map)->l_info[DT_PLTGOT]->d_un.d_ptr }) | |
| 78 | ||
| 79 | /* Extract the code address from a fixup value */ | |
| 80 | #define DL_FIXUP_VALUE_CODE_ADDR(value) ((value).ip) | |
| 81 | #define DL_FIXUP_VALUE_ADDR(value) ((uintptr_t) &(value)) | |
| 82 | #define DL_FIXUP_ADDR_VALUE(addr) (*(struct fdesc *) (addr)) |