1 | /* Support for relocating static PIE. |
2 | Copyright (C) 2017-2019 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 | <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; |
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 |
67 | } |
68 | #endif |
69 | |