| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame^] | 1 | /* dlinfo -- Get information from the dynamic linker. |
| 2 | Copyright (C) 2003-2016 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 | |
| 26 | int |
| 27 | dlinfo (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 | |
| 36 | struct dlinfo_args |
| 37 | { |
| 38 | ElfW(Addr) caller; |
| 39 | void *handle; |
| 40 | int request; |
| 41 | void *arg; |
| 42 | }; |
| 43 | |
| 44 | static void |
| 45 | dlinfo_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 | GLRO(dl_signal_error) (0, NULL, NULL, N_("\ |
| 64 | RTLD_SELF used in code not dynamically loaded")); |
| 65 | } |
| 66 | # endif |
| 67 | |
| 68 | switch (args->request) |
| 69 | { |
| 70 | case RTLD_DI_CONFIGADDR: |
| 71 | default: |
| 72 | GLRO(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 | |
| 110 | int |
| 111 | __dlinfo (void *handle, int request, void *arg DL_CALLER_DECL) |
| 112 | { |
| 113 | # ifdef SHARED |
| 114 | if (__glibc_unlikely (_dlfcn_hook != NULL)) |
| 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 |
| 124 | strong_alias (__dlinfo, dlinfo) |
| 125 | # endif |
| 126 | #endif |