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9d7a3741 | 1 | /* Support for relocating static PIE. |
688903eb | 2 | Copyright (C) 2017-2018 Free Software Foundation, Inc. |
9d7a3741 L |
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 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #if ENABLE_STATIC_PIE | |
20 | #include <unistd.h> | |
21 | #include <ldsodefs.h> | |
22 | #include "dynamic-link.h" | |
23 | ||
24 | /* Relocate static executable with PIE. */ | |
25 | ||
26 | void | |
27 | _dl_relocate_static_pie (void) | |
28 | { | |
29 | struct link_map *main_map = _dl_get_dl_main_map (); | |
30 | ||
31 | # define STATIC_PIE_BOOTSTRAP | |
32 | # define BOOTSTRAP_MAP (main_map) | |
33 | # define RESOLVE_MAP(sym, version, flags) BOOTSTRAP_MAP | |
34 | # include "dynamic-link.h" | |
35 | ||
36 | /* Figure out the run-time load address of static PIE. */ | |
37 | main_map->l_addr = elf_machine_load_address (); | |
38 | ||
39 | /* Read our own dynamic section and fill in the info array. */ | |
40 | main_map->l_ld = ((void *) main_map->l_addr + elf_machine_dynamic ()); | |
41 | elf_get_dynamic_info (main_map, NULL); | |
42 | ||
43 | # ifdef ELF_MACHINE_BEFORE_RTLD_RELOC | |
44 | ELF_MACHINE_BEFORE_RTLD_RELOC (main_map->l_info); | |
45 | # endif | |
46 | ||
47 | /* Relocate ourselves so we can do normal function calls and | |
48 | data access using the global offset table. */ | |
49 | ELF_DYNAMIC_RELOCATE (main_map, 0, 0, 0); | |
50 | main_map->l_relocated = 1; | |
7f7b5d8d L |
51 | |
52 | /* Initialize _r_debug. */ | |
53 | struct r_debug *r = _dl_debug_initialize (0, LM_ID_BASE); | |
54 | r->r_state = RT_CONSISTENT; | |
55 | ||
56 | /* Set up debugging before the debugger is notified for the first | |
57 | time. */ | |
58 | # ifdef ELF_MACHINE_DEBUG_SETUP | |
59 | /* Some machines (e.g. MIPS) don't use DT_DEBUG in this way. */ | |
60 | ELF_MACHINE_DEBUG_SETUP (main_map, r); | |
61 | # else | |
62 | if (main_map->l_info[DT_DEBUG] != NULL) | |
63 | /* There is a DT_DEBUG entry in the dynamic section. Fill it in | |
64 | with the run-time address of the r_debug structure */ | |
65 | main_map->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
66 | # endif | |
9d7a3741 L |
67 | } |
68 | #endif |