1/* dlinfo -- Get information from the dynamic linker.
2 Copyright (C) 2003-2019 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 <dlfcn.h>
20#include <link.h>
21#include <ldsodefs.h>
22#include <libintl.h>
23
24#if !defined SHARED && IS_IN (libdl)
25
26int
27dlinfo (void *handle, int request, void *arg)
28{
29 return __dlinfo (handle, request, arg, RETURN_ADDRESS (0));
30}
31
32#else
33
34# include <dl-tls.h>
35
36struct dlinfo_args
37{
38 ElfW(Addr) caller;
39 void *handle;
40 int request;
41 void *arg;
42};
43
44static void
45dlinfo_doit (void *argsblock)
46{
47 struct dlinfo_args *const args = argsblock;
48 struct link_map *l = args->handle;
49
50# if 0
51 if (args->handle == RTLD_SELF)
52 {
53 Lmid_t nsid;
54
55 /* Find the highest-addressed object that CALLER is not below. */
56 for (nsid = 0; nsid < DL_NNS; ++nsid)
57 for (l = GL(dl_ns)[nsid]._ns_loaded; l != NULL; l = l->l_next)
58 if (caller >= l->l_map_start && caller < l->l_map_end
59 && (l->l_contiguous || _dl_addr_inside_object (l, caller)))
60 break;
61
62 if (l == NULL)
63 _dl_signal_error (0, NULL, NULL, N_("\
64RTLD_SELF used in code not dynamically loaded"));
65 }
66# endif
67
68 switch (args->request)
69 {
70 case RTLD_DI_CONFIGADDR:
71 default:
72 _dl_signal_error (0, NULL, NULL, N_("unsupported dlinfo request"));
73 break;
74
75 case RTLD_DI_LMID:
76 *(Lmid_t *) args->arg = l->l_ns;
77 break;
78
79 case RTLD_DI_LINKMAP:
80 *(struct link_map **) args->arg = l;
81 break;
82
83 case RTLD_DI_SERINFO:
84 _dl_rtld_di_serinfo (l, args->arg, false);
85 break;
86 case RTLD_DI_SERINFOSIZE:
87 _dl_rtld_di_serinfo (l, args->arg, true);
88 break;
89
90 case RTLD_DI_ORIGIN:
91 strcpy (args->arg, l->l_origin);
92 break;
93
94 case RTLD_DI_TLS_MODID:
95 *(size_t *) args->arg = 0;
96 *(size_t *) args->arg = l->l_tls_modid;
97 break;
98
99 case RTLD_DI_TLS_DATA:
100 {
101 void *data = NULL;
102 if (l->l_tls_modid != 0)
103 data = GLRO(dl_tls_get_addr_soft) (l);
104 *(void **) args->arg = data;
105 break;
106 }
107 }
108}
109
110int
111__dlinfo (void *handle, int request, void *arg DL_CALLER_DECL)
112{
113# ifdef SHARED
114 if (!rtld_active ())
115 return _dlfcn_hook->dlinfo (handle, request, arg,
116 DL_CALLER);
117# endif
118
119 struct dlinfo_args args = { (ElfW(Addr)) DL_CALLER,
120 handle, request, arg };
121 return _dlerror_run (&dlinfo_doit, &args) ? -1 : 0;
122}
123# ifdef SHARED
124strong_alias (__dlinfo, dlinfo)
125# endif
126#endif
127