1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
|
/* Look up a symbol in a shared object loaded by `dlopen'.
Copyright (C) 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <stddef.h>
#include <setjmp.h>
#include <libintl.h>
#include <dlfcn.h>
#include <ldsodefs.h>
#include <dl-hash.h>
void *
internal_function
_dl_sym (void *handle, const char *name, void *who)
{
ElfW(Addr) loadbase;
const ElfW(Sym) *ref = NULL;
if (handle == RTLD_DEFAULT)
/* Search the global scope. */
loadbase = _dl_lookup_symbol (name, NULL, &ref, _dl_global_scope, 0);
else if (handle == RTLD_NEXT)
{
struct link_map *l, *match;
ElfW(Addr) caller = (ElfW(Addr)) who;
/* Find the highest-addressed object that CALLER is not below. */
match = NULL;
for (l = _dl_loaded; l; l = l->l_next)
if (caller >= l->l_addr && (!match || match->l_addr < l->l_addr))
match = l;
if (! match)
_dl_signal_error (0, NULL, _("\
RTLD_NEXT used in code not dynamically loaded"));
l = match;
while (l->l_loader)
l = l->l_loader;
loadbase = _dl_lookup_symbol_skip (name, l, &ref, l->l_local_scope,
match);
}
else
{
/* Search the scope of the given object. */
struct link_map *map = handle;
loadbase = _dl_lookup_symbol (name, map, &ref, map->l_local_scope, 0);
}
if (loadbase)
return (void *) (loadbase + ref->st_value);
return NULL;
}
void *
internal_function
_dl_vsym (void *handle, const char *name, const char *version, void *who)
{
ElfW(Addr) loadbase;
const ElfW(Sym) *ref = NULL;
struct r_found_version vers;
/* Compute hash value to the version string. */
vers.name = version;
vers.hidden = 1;
vers.hash = _dl_elf_hash (version);
/* We don't have a specific file where the symbol can be found. */
vers.filename = NULL;
if (handle == RTLD_DEFAULT)
/* Search the global scope. */
loadbase = _dl_lookup_versioned_symbol (name, NULL, &ref, _dl_global_scope,
&vers, 0);
else if (handle == RTLD_NEXT)
{
struct link_map *l, *match;
ElfW(Addr) caller = (ElfW(Addr)) who;
/* Find the highest-addressed object that CALLER is not below. */
match = NULL;
for (l = _dl_loaded; l; l = l->l_next)
if (caller >= l->l_addr && (!match || match->l_addr < l->l_addr))
match = l;
if (! match)
_dl_signal_error (0, NULL, _("\
RTLD_NEXT used in code not dynamically loaded"));
l = match;
while (l->l_loader)
l = l->l_loader;
loadbase = _dl_lookup_versioned_symbol_skip (name, l, &ref,
l->l_local_scope,
&vers, match);
}
else
{
/* Search the scope of the given object. */
struct link_map *map = handle;
loadbase = _dl_lookup_versioned_symbol (name, map, &ref,
map->l_local_scope, &vers, 0);
}
if (loadbase)
return (void *) (loadbase + ref->st_value);
return NULL;
}
|
