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1/* Variable initialization. AArch64 version.
2 Copyright (C) 2001-2019 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#include <ldsodefs.h>
20
21#ifdef SHARED
22
23void
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
36
37static void *variables[] =
38{
39 &GLRO(dl_pagesize)
40};
41
42static 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
54void
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
64 loadbase = _dl_lookup_symbol_x ("_dl_var_init", l, &ref, l->l_local_scope,
65 NULL, 0, 1, NULL);
66
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 }
82}
83
84#endif
85

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