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9290e553 | 1 | /* Variable initialization. MIPS version. |
d614a753 | 2 | Copyright (C) 2001-2020 Free Software Foundation, Inc. |
9290e553 DJ |
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 | |
ab84e3ff | 16 | License along with the GNU C Library. If not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
9290e553 DJ |
18 | |
19 | #include <ldsodefs.h> | |
20 | ||
21 | #ifdef SHARED | |
22 | ||
23 | void | |
24 | _dl_var_init (void *array[]) | |
25 | { | |
26 | /* It has to match "variables" below. */ | |
27 | enum | |
28 | { | |
29 | DL_PAGESIZE = 0 | |
30 | }; | |
31 | ||
32 | GLRO(dl_pagesize) = *((size_t *) array[DL_PAGESIZE]); | |
33 | } | |
34 | ||
35 | #else | |
9290e553 DJ |
36 | |
37 | static void *variables[] = | |
38 | { | |
39 | &GLRO(dl_pagesize) | |
40 | }; | |
41 | ||
42 | static void | |
43 | _dl_unprotect_relro (struct link_map *l) | |
44 | { | |
45 | ElfW(Addr) start = ((l->l_addr + l->l_relro_addr) | |
46 | & ~(GLRO(dl_pagesize) - 1)); | |
47 | ElfW(Addr) end = ((l->l_addr + l->l_relro_addr + l->l_relro_size) | |
48 | & ~(GLRO(dl_pagesize) - 1)); | |
49 | ||
50 | if (start != end) | |
51 | __mprotect ((void *) start, end - start, PROT_READ | PROT_WRITE); | |
52 | } | |
53 | ||
54 | void | |
55 | _dl_static_init (struct link_map *l) | |
56 | { | |
57 | struct link_map *rtld_map = l; | |
58 | struct r_scope_elem **scope; | |
59 | const ElfW(Sym) *ref = NULL; | |
60 | lookup_t loadbase; | |
61 | void (*f) (void *[]); | |
62 | size_t i; | |
63 | ||
9290e553 DJ |
64 | loadbase = _dl_lookup_symbol_x ("_dl_var_init", l, &ref, l->l_local_scope, |
65 | NULL, 0, 1, NULL); | |
5556231d | 66 | |
9290e553 DJ |
67 | for (scope = l->l_local_scope; *scope != NULL; scope++) |
68 | for (i = 0; i < (*scope)->r_nlist; i++) | |
69 | if ((*scope)->r_list[i] == loadbase) | |
70 | { | |
71 | rtld_map = (*scope)->r_list[i]; | |
72 | break; | |
73 | } | |
74 | ||
75 | if (ref != NULL) | |
76 | { | |
77 | f = (void (*) (void *[])) DL_SYMBOL_ADDRESS (loadbase, ref); | |
78 | _dl_unprotect_relro (rtld_map); | |
79 | f (variables); | |
80 | _dl_protect_relro (rtld_map); | |
81 | } | |
9290e553 DJ |
82 | } |
83 | ||
84 | #endif |