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d66e34cd | 1 | /* Run time dynamic linker. |
1ca7cbcb | 2 | Copyright (C) 1995-1999, 2000 Free Software Foundation, Inc. |
afd4eb37 | 3 | This file is part of the GNU C Library. |
d66e34cd | 4 | |
afd4eb37 UD |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | License, or (at your option) any later version. | |
d66e34cd | 9 | |
afd4eb37 UD |
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 | Library General Public License for more details. | |
d66e34cd | 14 | |
afd4eb37 UD |
15 | You should have received a copy of the GNU Library General Public |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
d66e34cd | 19 | |
7dea968e | 20 | #include <fcntl.h> |
d66e34cd | 21 | #include <stdlib.h> |
f51d1dfd | 22 | #include <string.h> |
d66e34cd | 23 | #include <unistd.h> |
2064087b | 24 | #include <sys/mman.h> /* Check if MAP_ANON is defined. */ |
a42195db | 25 | #include <ldsodefs.h> |
ce37fa88 | 26 | #include <stdio-common/_itoa.h> |
f21acc89 | 27 | #include <entry.h> |
c94a8080 | 28 | #include <fpu_control.h> |
db276fa1 | 29 | #include <hp-timing.h> |
cf197e41 | 30 | #include <bits/libc-lock.h> |
f5348425 | 31 | #include "dynamic-link.h" |
e2102c14 | 32 | #include "dl-librecon.h" |
f5348425 | 33 | |
a853022c | 34 | #include <assert.h> |
f5348425 | 35 | |
d66e34cd RM |
36 | /* System-specific function to do initial startup for the dynamic linker. |
37 | After this, file access calls and getenv must work. This is responsible | |
cddcfecf | 38 | for setting __libc_enable_secure if we need to be secure (e.g. setuid), |
d66e34cd | 39 | and for setting _dl_argc and _dl_argv, and then calling _dl_main. */ |
266180eb RM |
40 | extern ElfW(Addr) _dl_sysdep_start (void **start_argptr, |
41 | void (*dl_main) (const ElfW(Phdr) *phdr, | |
42 | ElfW(Half) phent, | |
43 | ElfW(Addr) *user_entry)); | |
4cb20290 | 44 | extern void _dl_sysdep_start_cleanup (void); |
d66e34cd | 45 | |
08cac4ac UD |
46 | /* This function is used to unload the cache file if necessary. */ |
47 | extern void _dl_unload_cache (void); | |
48 | ||
14bab8de UD |
49 | /* System-dependent function to read a file's whole contents |
50 | in the most convenient manner available. */ | |
51 | extern void *_dl_sysdep_read_whole_file (const char *filename, | |
52 | size_t *filesize_ptr, | |
53 | int mmap_prot); | |
54 | ||
fd26970f | 55 | /* Helper function to handle errors while resolving symbols. */ |
c84142e8 UD |
56 | static void print_unresolved (int errcode, const char *objname, |
57 | const char *errsting); | |
58 | ||
59 | /* Helper function to handle errors when a version is missing. */ | |
60 | static void print_missing_version (int errcode, const char *objname, | |
61 | const char *errsting); | |
fd26970f | 62 | |
db276fa1 UD |
63 | /* Print the various times we collected. */ |
64 | static void print_statistics (void); | |
ea278354 UD |
65 | |
66 | /* This is a list of all the modes the dynamic loader can be in. */ | |
67 | enum mode { normal, list, verify, trace }; | |
68 | ||
69 | /* Process all environments variables the dynamic linker must recognize. | |
70 | Since all of them start with `LD_' we are a bit smarter while finding | |
71 | all the entries. */ | |
72 | static void process_envvars (enum mode *modep, int *lazyp); | |
73 | ||
d66e34cd RM |
74 | int _dl_argc; |
75 | char **_dl_argv; | |
ceb27555 | 76 | unsigned int _dl_skip_args; /* Nonzero if we were run directly. */ |
cf29ffbe | 77 | int _dl_verbose; |
0a54e401 UD |
78 | const char *_dl_platform; |
79 | size_t _dl_platformlen; | |
f41c8091 | 80 | unsigned long _dl_hwcap; |
c94a8080 | 81 | fpu_control_t _dl_fpu_control = _FPU_DEFAULT; |
0a54e401 | 82 | struct r_search_path *_dl_search_paths; |
3996f34b UD |
83 | const char *_dl_profile; |
84 | const char *_dl_profile_output; | |
a3d6fb9b | 85 | struct link_map *_dl_profile_map; |
12b5b6b7 | 86 | int _dl_lazy; |
b5efde2f | 87 | int _dl_debug_libs; |
7dea968e | 88 | int _dl_debug_impcalls; |
0c367d92 | 89 | int _dl_debug_bindings; |
de100ca7 | 90 | int _dl_debug_symbols; |
8193034b UD |
91 | int _dl_debug_versions; |
92 | int _dl_debug_reloc; | |
93 | int _dl_debug_files; | |
db276fa1 | 94 | int _dl_debug_statistics; |
b0a01055 | 95 | const char *_dl_inhibit_rpath; /* RPATH values which should be |
310930c1 | 96 | ignored. */ |
f787edde | 97 | const char *_dl_origin_path; |
d66e34cd | 98 | |
be935610 UD |
99 | /* This is a pointer to the map for the main object and through it to |
100 | all loaded objects. */ | |
101 | struct link_map *_dl_loaded; | |
102 | /* Pointer to the l_searchlist element of the link map of the main object. */ | |
103 | struct r_scope_elem *_dl_main_searchlist; | |
604510f7 UD |
104 | /* Copy of the content of `_dl_main_searchlist'. */ |
105 | struct r_scope_elem _dl_initial_searchlist; | |
be935610 UD |
106 | /* Array which is used when looking up in the global scope. */ |
107 | struct r_scope_elem *_dl_global_scope[2]; | |
108 | ||
cf197e41 UD |
109 | /* During the program run we must not modify the global data of |
110 | loaded shared object simultanously in two threads. Therefore we | |
111 | protect `_dl_open' and `_dl_close' in dl-close.c. | |
112 | ||
113 | This must be a recursive lock since the initializer function of | |
114 | the loaded object might as well require a call to this function. | |
115 | At this time it is not anymore a problem to modify the tables. */ | |
116 | __libc_lock_define_initialized_recursive (, _dl_load_lock) | |
117 | ||
39778c6c UD |
118 | /* Set nonzero during loading and initialization of executable and |
119 | libraries, cleared before the executable's entry point runs. This | |
120 | must not be initialized to nonzero, because the unused dynamic | |
121 | linker loaded in for libc.so's "ld.so.1" dep will provide the | |
122 | definition seen by libc.so's initializer; that value must be zero, | |
123 | and will be since that dynamic linker's _dl_start and dl_main will | |
124 | never be called. */ | |
125 | int _dl_starting_up; | |
126 | ||
c0fb8a56 | 127 | |
266180eb RM |
128 | static void dl_main (const ElfW(Phdr) *phdr, |
129 | ElfW(Half) phent, | |
130 | ElfW(Addr) *user_entry); | |
d66e34cd | 131 | |
ee188d55 | 132 | struct link_map _dl_rtld_map; |
c84142e8 | 133 | struct libname_list _dl_rtld_libname; |
f41c8091 | 134 | struct libname_list _dl_rtld_libname2; |
86d2c878 | 135 | |
db276fa1 UD |
136 | /* Variable for statistics. */ |
137 | static hp_timing_t rtld_total_time; | |
138 | static hp_timing_t relocate_time; | |
139 | static hp_timing_t load_time; | |
140 | extern unsigned long int _dl_num_relocations; /* in dl-lookup.c */ | |
141 | ||
6a1db4ff UD |
142 | static ElfW(Addr) _dl_start_final (void *arg, struct link_map *bootstrap_map_p, |
143 | hp_timing_t start_time); | |
144 | ||
b1dbbaa4 RM |
145 | #ifdef RTLD_START |
146 | RTLD_START | |
147 | #else | |
148 | #error "sysdeps/MACHINE/dl-machine.h fails to define RTLD_START" | |
149 | #endif | |
150 | ||
ceb2d9aa | 151 | static ElfW(Addr) |
d66e34cd RM |
152 | _dl_start (void *arg) |
153 | { | |
86d2c878 | 154 | struct link_map bootstrap_map; |
db276fa1 | 155 | hp_timing_t start_time; |
264ec183 | 156 | size_t cnt; |
d66e34cd | 157 | |
b1dbbaa4 RM |
158 | /* This #define produces dynamic linking inline functions for |
159 | bootstrap relocation instead of general-purpose relocation. */ | |
160 | #define RTLD_BOOTSTRAP | |
50463d27 UD |
161 | #define RESOLVE(sym, version, flags) \ |
162 | ((*(sym))->st_shndx == SHN_UNDEF ? 0 : bootstrap_map.l_addr) | |
b1dbbaa4 RM |
163 | #include "dynamic-link.h" |
164 | ||
db276fa1 UD |
165 | if (HP_TIMING_INLINE && HP_TIMING_AVAIL) |
166 | HP_TIMING_NOW (start_time); | |
167 | ||
264ec183 UD |
168 | /* Partly clean the `bootstrap_map' structure up. Don't use `memset' |
169 | since it might nor be built in or inlined and we cannot make function | |
170 | calls at this point. */ | |
171 | for (cnt = 0; | |
172 | cnt < sizeof (bootstrap_map.l_info) / sizeof (bootstrap_map.l_info[0]); | |
173 | ++cnt) | |
174 | bootstrap_map.l_info[cnt] = 0; | |
175 | ||
d66e34cd | 176 | /* Figure out the run-time load address of the dynamic linker itself. */ |
86d2c878 | 177 | bootstrap_map.l_addr = elf_machine_load_address (); |
d66e34cd | 178 | |
47707456 UD |
179 | /* Read our own dynamic section and fill in the info array. */ |
180 | bootstrap_map.l_ld = (void *) bootstrap_map.l_addr + elf_machine_dynamic (); | |
d3ac2d47 | 181 | elf_get_dynamic_info (&bootstrap_map); |
d66e34cd RM |
182 | |
183 | #ifdef ELF_MACHINE_BEFORE_RTLD_RELOC | |
86d2c878 | 184 | ELF_MACHINE_BEFORE_RTLD_RELOC (bootstrap_map.l_info); |
d66e34cd RM |
185 | #endif |
186 | ||
187 | /* Relocate ourselves so we can do normal function calls and | |
188 | data access using the global offset table. */ | |
421f82e5 | 189 | |
3996f34b | 190 | ELF_DYNAMIC_RELOCATE (&bootstrap_map, 0, 0); |
ea7eb7e3 UD |
191 | /* Please note that we don't allow profiling of this object and |
192 | therefore need not test whether we have to allocate the array | |
193 | for the relocation results (as done in dl-reloc.c). */ | |
421f82e5 | 194 | |
d66e34cd RM |
195 | /* Now life is sane; we can call functions and access global data. |
196 | Set up to use the operating system facilities, and find out from | |
197 | the operating system's program loader where to find the program | |
6a1db4ff UD |
198 | header table in core. Put the rest of _dl_start into a separate |
199 | function, that way the compiler cannot put accesses to the GOT | |
200 | before ELF_DYNAMIC_RELOCATE. */ | |
201 | return _dl_start_final (arg, &bootstrap_map, start_time); | |
202 | } | |
203 | ||
204 | ||
205 | static ElfW(Addr) | |
206 | _dl_start_final (void *arg, struct link_map *bootstrap_map_p, | |
207 | hp_timing_t start_time) | |
208 | { | |
209 | /* The use of `alloca' here looks ridiculous but it helps. The goal | |
210 | is to avoid the function from being inlined. There is no official | |
211 | way to do this so we use this trick. gcc never inlines functions | |
212 | which use `alloca'. */ | |
213 | ElfW(Addr) *start_addr = alloca (sizeof (ElfW(Addr))); | |
d66e34cd | 214 | |
db276fa1 UD |
215 | if (HP_TIMING_AVAIL) |
216 | { | |
217 | /* If it hasn't happen yet record the startup time. */ | |
218 | if (! HP_TIMING_INLINE) | |
219 | HP_TIMING_NOW (start_time); | |
220 | ||
221 | /* Initialize the timing functions. */ | |
222 | HP_TIMING_DIFF_INIT (); | |
223 | } | |
224 | ||
86d2c878 | 225 | /* Transfer data about ourselves to the permanent link_map structure. */ |
6a1db4ff UD |
226 | _dl_rtld_map.l_addr = bootstrap_map_p->l_addr; |
227 | _dl_rtld_map.l_ld = bootstrap_map_p->l_ld; | |
f41c8091 | 228 | _dl_rtld_map.l_opencount = 1; |
6a1db4ff | 229 | memcpy (_dl_rtld_map.l_info, bootstrap_map_p->l_info, |
ee188d55 RM |
230 | sizeof _dl_rtld_map.l_info); |
231 | _dl_setup_hash (&_dl_rtld_map); | |
86d2c878 | 232 | |
052b6a6c UD |
233 | /* Don't bother trying to work out how ld.so is mapped in memory. */ |
234 | _dl_rtld_map.l_map_start = ~0; | |
235 | _dl_rtld_map.l_map_end = ~0; | |
236 | ||
d66e34cd RM |
237 | /* Call the OS-dependent function to set up life so we can do things like |
238 | file access. It will call `dl_main' (below) to do all the real work | |
239 | of the dynamic linker, and then unwind our frame and run the user | |
240 | entry point on the same stack we entered on. */ | |
6a1db4ff | 241 | *start_addr = _dl_sysdep_start (arg, &dl_main); |
db276fa1 UD |
242 | |
243 | if (HP_TIMING_AVAIL) | |
244 | { | |
245 | hp_timing_t end_time; | |
246 | ||
247 | /* Get the current time. */ | |
248 | HP_TIMING_NOW (end_time); | |
249 | ||
250 | /* Compute the difference. */ | |
251 | HP_TIMING_DIFF (rtld_total_time, start_time, end_time); | |
252 | } | |
253 | ||
254 | if (_dl_debug_statistics) | |
255 | print_statistics (); | |
256 | ||
6a1db4ff | 257 | return *start_addr; |
d66e34cd RM |
258 | } |
259 | ||
d66e34cd RM |
260 | /* Now life is peachy; we can do all normal operations. |
261 | On to the real work. */ | |
262 | ||
f21acc89 | 263 | void ENTRY_POINT (void); |
d66e34cd | 264 | |
993b3242 UD |
265 | /* Some helper functions. */ |
266 | ||
267 | /* Arguments to relocate_doit. */ | |
268 | struct relocate_args | |
269 | { | |
270 | struct link_map *l; | |
271 | int lazy; | |
272 | }; | |
273 | ||
274 | struct map_args | |
275 | { | |
276 | /* Argument to map_doit. */ | |
277 | char *str; | |
278 | /* Return value of map_doit. */ | |
279 | struct link_map *main_map; | |
280 | }; | |
281 | ||
282 | /* Arguments to version_check_doit. */ | |
283 | struct version_check_args | |
284 | { | |
993b3242 UD |
285 | int doexit; |
286 | }; | |
287 | ||
288 | static void | |
289 | relocate_doit (void *a) | |
290 | { | |
291 | struct relocate_args *args = (struct relocate_args *) a; | |
292 | ||
be935610 | 293 | _dl_relocate_object (args->l, args->l->l_scope, |
c0fb8a56 | 294 | args->lazy, 0); |
993b3242 UD |
295 | } |
296 | ||
297 | static void | |
298 | map_doit (void *a) | |
299 | { | |
be935610 | 300 | struct map_args *args = (struct map_args *) a; |
c6222ab9 | 301 | args->main_map = _dl_map_object (NULL, args->str, 0, lt_library, 0); |
993b3242 UD |
302 | } |
303 | ||
304 | static void | |
305 | version_check_doit (void *a) | |
306 | { | |
be935610 UD |
307 | struct version_check_args *args = (struct version_check_args *) a; |
308 | if (_dl_check_all_versions (_dl_loaded, 1) && args->doexit) | |
993b3242 UD |
309 | /* We cannot start the application. Abort now. */ |
310 | _exit (1); | |
311 | } | |
312 | ||
ce37fa88 UD |
313 | |
314 | static inline struct link_map * | |
315 | find_needed (const char *name) | |
316 | { | |
be935610 | 317 | unsigned int n = _dl_loaded->l_searchlist.r_nlist; |
ce37fa88 | 318 | |
be935610 UD |
319 | while (n-- > 0) |
320 | if (_dl_name_match_p (name, _dl_loaded->l_searchlist.r_list[n])) | |
321 | return _dl_loaded->l_searchlist.r_list[n]; | |
ce37fa88 UD |
322 | |
323 | /* Should never happen. */ | |
324 | return NULL; | |
325 | } | |
326 | ||
327 | static int | |
328 | match_version (const char *string, struct link_map *map) | |
329 | { | |
a42195db | 330 | const char *strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
ce37fa88 UD |
331 | ElfW(Verdef) *def; |
332 | ||
333 | #define VERDEFTAG (DT_NUM + DT_PROCNUM + DT_VERSIONTAGIDX (DT_VERDEF)) | |
334 | if (map->l_info[VERDEFTAG] == NULL) | |
335 | /* The file has no symbol versioning. */ | |
336 | return 0; | |
337 | ||
338 | def = (ElfW(Verdef) *) ((char *) map->l_addr | |
339 | + map->l_info[VERDEFTAG]->d_un.d_ptr); | |
340 | while (1) | |
341 | { | |
342 | ElfW(Verdaux) *aux = (ElfW(Verdaux) *) ((char *) def + def->vd_aux); | |
343 | ||
344 | /* Compare the version strings. */ | |
345 | if (strcmp (string, strtab + aux->vda_name) == 0) | |
346 | /* Bingo! */ | |
347 | return 1; | |
348 | ||
349 | /* If no more definitions we failed to find what we want. */ | |
350 | if (def->vd_next == 0) | |
351 | break; | |
352 | ||
353 | /* Next definition. */ | |
354 | def = (ElfW(Verdef) *) ((char *) def + def->vd_next); | |
355 | } | |
356 | ||
357 | return 0; | |
358 | } | |
359 | ||
120b4c49 UD |
360 | static const char *library_path; /* The library search path. */ |
361 | static const char *preloadlist; /* The list preloaded objects. */ | |
362 | static int version_info; /* Nonzero if information about | |
363 | versions has to be printed. */ | |
a1a9d215 | 364 | |
d66e34cd | 365 | static void |
266180eb RM |
366 | dl_main (const ElfW(Phdr) *phdr, |
367 | ElfW(Half) phent, | |
368 | ElfW(Addr) *user_entry) | |
d66e34cd | 369 | { |
266180eb | 370 | const ElfW(Phdr) *ph; |
ea278354 | 371 | enum mode mode; |
2064087b RM |
372 | struct link_map **preloads; |
373 | unsigned int npreloads; | |
14bab8de UD |
374 | size_t file_size; |
375 | char *file; | |
2f6d1f1b | 376 | int has_interp = 0; |
77aba05b | 377 | unsigned int i; |
9a51759b | 378 | int rtld_is_main = 0; |
db276fa1 UD |
379 | hp_timing_t start; |
380 | hp_timing_t stop; | |
381 | hp_timing_t diff; | |
d66e34cd | 382 | |
ea278354 | 383 | /* Process the environment variable which control the behaviour. */ |
12b5b6b7 | 384 | process_envvars (&mode, &_dl_lazy); |
3996f34b | 385 | |
46ec036d UD |
386 | /* Set up a flag which tells we are just starting. */ |
387 | _dl_starting_up = 1; | |
388 | ||
f21acc89 | 389 | if (*user_entry == (ElfW(Addr)) &ENTRY_POINT) |
0200214b RM |
390 | { |
391 | /* Ho ho. We are not the program interpreter! We are the program | |
392 | itself! This means someone ran ld.so as a command. Well, that | |
393 | might be convenient to do sometimes. We support it by | |
394 | interpreting the args like this: | |
395 | ||
396 | ld.so PROGRAM ARGS... | |
397 | ||
398 | The first argument is the name of a file containing an ELF | |
399 | executable we will load and run with the following arguments. | |
400 | To simplify life here, PROGRAM is searched for using the | |
401 | normal rules for shared objects, rather than $PATH or anything | |
402 | like that. We just load it and use its entry point; we don't | |
403 | pay attention to its PT_INTERP command (we are the interpreter | |
404 | ourselves). This is an easy way to test a new ld.so before | |
405 | installing it. */ | |
9a51759b | 406 | rtld_is_main = 1; |
421f82e5 | 407 | |
ffee1316 RM |
408 | /* Note the place where the dynamic linker actually came from. */ |
409 | _dl_rtld_map.l_name = _dl_argv[0]; | |
6a76c115 | 410 | |
fd26970f UD |
411 | while (_dl_argc > 1) |
412 | if (! strcmp (_dl_argv[1], "--list")) | |
413 | { | |
414 | mode = list; | |
12b5b6b7 | 415 | _dl_lazy = -1; /* This means do no dependency analysis. */ |
61965e9b | 416 | |
fd26970f UD |
417 | ++_dl_skip_args; |
418 | --_dl_argc; | |
419 | ++_dl_argv; | |
420 | } | |
421 | else if (! strcmp (_dl_argv[1], "--verify")) | |
422 | { | |
423 | mode = verify; | |
6a76c115 | 424 | |
fd26970f UD |
425 | ++_dl_skip_args; |
426 | --_dl_argc; | |
427 | ++_dl_argv; | |
428 | } | |
310930c1 | 429 | else if (! strcmp (_dl_argv[1], "--library-path") && _dl_argc > 2) |
880f421f UD |
430 | { |
431 | library_path = _dl_argv[2]; | |
432 | ||
310930c1 UD |
433 | _dl_skip_args += 2; |
434 | _dl_argc -= 2; | |
435 | _dl_argv += 2; | |
436 | } | |
b0a01055 | 437 | else if (! strcmp (_dl_argv[1], "--inhibit-rpath") && _dl_argc > 2) |
310930c1 | 438 | { |
b0a01055 | 439 | _dl_inhibit_rpath = _dl_argv[2]; |
310930c1 | 440 | |
880f421f UD |
441 | _dl_skip_args += 2; |
442 | _dl_argc -= 2; | |
443 | _dl_argv += 2; | |
444 | } | |
fd26970f UD |
445 | else |
446 | break; | |
d66e34cd | 447 | |
61eb22d3 UD |
448 | /* If we have no further argument the program was called incorrectly. |
449 | Grant the user some education. */ | |
450 | if (_dl_argc < 2) | |
451 | _dl_sysdep_fatal ("\ | |
2bcf29ba | 452 | Usage: ld.so [OPTION]... EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]\n\ |
61eb22d3 UD |
453 | You have invoked `ld.so', the helper program for shared library executables.\n\ |
454 | This program usually lives in the file `/lib/ld.so', and special directives\n\ | |
455 | in executable files using ELF shared libraries tell the system's program\n\ | |
456 | loader to load the helper program from this file. This helper program loads\n\ | |
457 | the shared libraries needed by the program executable, prepares the program\n\ | |
458 | to run, and runs it. You may invoke this helper program directly from the\n\ | |
459 | command line to load and run an ELF executable file; this is like executing\n\ | |
460 | that file itself, but always uses this helper program from the file you\n\ | |
461 | specified, instead of the helper program file specified in the executable\n\ | |
462 | file you run. This is mostly of use for maintainers to test new versions\n\ | |
2bcf29ba UD |
463 | of this helper program; chances are you did not intend to run this program.\n\ |
464 | \n\ | |
b0a01055 UD |
465 | --list list all dependencies and how they are resolved\n\ |
466 | --verify verify that given object really is a dynamically linked\n\ | |
e8b1163e | 467 | object we can handle\n\ |
b0a01055 UD |
468 | --library-path PATH use given PATH instead of content of the environment\n\ |
469 | variable LD_LIBRARY_PATH\n\ | |
fcf70d41 UD |
470 | --inhibit-rpath LIST ignore RUNPATH and RPATH information in object names\n\ |
471 | in LIST\n", | |
61eb22d3 UD |
472 | NULL); |
473 | ||
0200214b RM |
474 | ++_dl_skip_args; |
475 | --_dl_argc; | |
476 | ++_dl_argv; | |
91f62ce6 | 477 | |
da832465 UD |
478 | /* Initialize the data structures for the search paths for shared |
479 | objects. */ | |
480 | _dl_init_paths (library_path); | |
481 | ||
9a821cf9 | 482 | if (__builtin_expect (mode, normal) == verify) |
2de99474 | 483 | { |
dcf0671d | 484 | char *err_str = NULL; |
993b3242 | 485 | struct map_args args; |
2de99474 | 486 | |
993b3242 | 487 | args.str = _dl_argv[0]; |
8d9618b7 | 488 | (void) _dl_catch_error (&err_str, map_doit, &args); |
2de99474 | 489 | if (err_str != NULL) |
dcf0671d UD |
490 | { |
491 | free (err_str); | |
492 | _exit (EXIT_FAILURE); | |
493 | } | |
2de99474 UD |
494 | } |
495 | else | |
db276fa1 UD |
496 | { |
497 | HP_TIMING_NOW (start); | |
498 | _dl_map_object (NULL, _dl_argv[0], 0, lt_library, 0); | |
499 | HP_TIMING_NOW (stop); | |
61e0617a | 500 | |
db276fa1 UD |
501 | HP_TIMING_DIFF (load_time, start, stop); |
502 | } | |
2de99474 | 503 | |
be935610 UD |
504 | phdr = _dl_loaded->l_phdr; |
505 | phent = _dl_loaded->l_phnum; | |
143e2b96 UD |
506 | /* We overwrite here a pointer to a malloc()ed string. But since |
507 | the malloc() implementation used at this point is the dummy | |
508 | implementations which has no real free() function it does not | |
509 | makes sense to free the old string first. */ | |
be935610 UD |
510 | _dl_loaded->l_name = (char *) ""; |
511 | *user_entry = _dl_loaded->l_entry; | |
0200214b RM |
512 | } |
513 | else | |
514 | { | |
515 | /* Create a link_map for the executable itself. | |
516 | This will be what dlopen on "" returns. */ | |
87c812c2 | 517 | _dl_new_object ((char *) "", "", lt_executable, NULL); |
be935610 | 518 | if (_dl_loaded == NULL) |
762a2918 | 519 | _dl_sysdep_fatal ("cannot allocate memory for link map\n", NULL); |
be935610 UD |
520 | _dl_loaded->l_phdr = phdr; |
521 | _dl_loaded->l_phnum = phent; | |
522 | _dl_loaded->l_entry = *user_entry; | |
523 | _dl_loaded->l_opencount = 1; | |
da832465 | 524 | |
61e0617a UD |
525 | /* At this point we are in a bit of trouble. We would have to |
526 | fill in the values for l_dev and l_ino. But in general we | |
527 | do not know where the file is. We also do not handle AT_EXECFD | |
528 | even if it would be passed up. | |
529 | ||
530 | We leave the values here defined to 0. This is normally no | |
531 | problem as the program code itself is normally no shared | |
532 | object and therefore cannot be loaded dynamically. Nothing | |
533 | prevent the use of dynamic binaries and in these situations | |
534 | we might get problems. We might not be able to find out | |
535 | whether the object is already loaded. But since there is no | |
536 | easy way out and because the dynamic binary must also not | |
537 | have an SONAME we ignore this program for now. If it becomes | |
538 | a problem we can force people using SONAMEs. */ | |
539 | ||
97a51d8a UD |
540 | /* We delay initializing the path structure until we got the dynamic |
541 | information for the program. */ | |
0200214b RM |
542 | } |
543 | ||
052b6a6c | 544 | /* It is not safe to load stuff after the main program. */ |
be935610 | 545 | _dl_loaded->l_map_end = ~0; |
052b6a6c | 546 | /* Perhaps the executable has no PT_LOAD header entries at all. */ |
be935610 | 547 | _dl_loaded->l_map_start = ~0; |
052b6a6c | 548 | |
0200214b RM |
549 | /* Scan the program header table for the dynamic section. */ |
550 | for (ph = phdr; ph < &phdr[phent]; ++ph) | |
551 | switch (ph->p_type) | |
552 | { | |
da832465 UD |
553 | case PT_PHDR: |
554 | /* Find out the load address. */ | |
be935610 | 555 | _dl_loaded->l_addr = (ElfW(Addr)) phdr - ph->p_vaddr; |
da832465 | 556 | break; |
0200214b RM |
557 | case PT_DYNAMIC: |
558 | /* This tells us where to find the dynamic section, | |
559 | which tells us everything we need to do. */ | |
be935610 | 560 | _dl_loaded->l_ld = (void *) _dl_loaded->l_addr + ph->p_vaddr; |
0200214b RM |
561 | break; |
562 | case PT_INTERP: | |
563 | /* This "interpreter segment" was used by the program loader to | |
564 | find the program interpreter, which is this program itself, the | |
565 | dynamic linker. We note what name finds us, so that a future | |
566 | dlopen call or DT_NEEDED entry, for something that wants to link | |
567 | against the dynamic linker as a shared library, will know that | |
568 | the shared object is already loaded. */ | |
be935610 UD |
569 | _dl_rtld_libname.name = ((const char *) _dl_loaded->l_addr |
570 | + ph->p_vaddr); | |
c84142e8 UD |
571 | _dl_rtld_libname.next = NULL; |
572 | _dl_rtld_map.l_libname = &_dl_rtld_libname; | |
f41c8091 UD |
573 | |
574 | /* Ordinarilly, we would get additional names for the loader from | |
575 | our DT_SONAME. This can't happen if we were actually linked as | |
576 | a static executable (detect this case when we have no DYNAMIC). | |
577 | If so, assume the filename component of the interpreter path to | |
578 | be our SONAME, and add it to our name list. */ | |
579 | if (_dl_rtld_map.l_ld == NULL) | |
580 | { | |
581 | char *p = strrchr (_dl_rtld_libname.name, '/'); | |
582 | if (p) | |
583 | { | |
584 | _dl_rtld_libname2.name = p+1; | |
585 | _dl_rtld_libname2.next = NULL; | |
586 | _dl_rtld_libname.next = &_dl_rtld_libname2; | |
587 | } | |
588 | } | |
589 | ||
2f6d1f1b | 590 | has_interp = 1; |
0200214b | 591 | break; |
052b6a6c UD |
592 | case PT_LOAD: |
593 | /* Remember where the main program starts in memory. */ | |
594 | { | |
595 | ElfW(Addr) mapstart; | |
be935610 UD |
596 | mapstart = _dl_loaded->l_addr + (ph->p_vaddr & ~(ph->p_align - 1)); |
597 | if (_dl_loaded->l_map_start > mapstart) | |
598 | _dl_loaded->l_map_start = mapstart; | |
052b6a6c UD |
599 | } |
600 | break; | |
0200214b | 601 | } |
ffee1316 | 602 | if (! _dl_rtld_map.l_libname && _dl_rtld_map.l_name) |
c84142e8 UD |
603 | { |
604 | /* We were invoked directly, so the program might not have a | |
605 | PT_INTERP. */ | |
606 | _dl_rtld_libname.name = _dl_rtld_map.l_name; | |
607 | _dl_rtld_libname.next = NULL; | |
608 | _dl_rtld_map.l_libname = &_dl_rtld_libname; | |
609 | } | |
ffee1316 RM |
610 | else |
611 | assert (_dl_rtld_map.l_libname); /* How else did we get here? */ | |
0200214b | 612 | |
9a51759b UD |
613 | if (! rtld_is_main) |
614 | { | |
615 | /* Extract the contents of the dynamic section for easy access. */ | |
d3ac2d47 | 616 | elf_get_dynamic_info (_dl_loaded); |
9a51759b UD |
617 | if (_dl_loaded->l_info[DT_HASH]) |
618 | /* Set up our cache of pointers into the hash table. */ | |
619 | _dl_setup_hash (_dl_loaded); | |
620 | } | |
0200214b | 621 | |
9a821cf9 | 622 | if (__builtin_expect (mode, normal) == verify) |
e2102c14 UD |
623 | { |
624 | /* We were called just to verify that this is a dynamic | |
625 | executable using us as the program interpreter. Exit with an | |
626 | error if we were not able to load the binary or no interpreter | |
627 | is specified (i.e., this is no dynamically linked binary. */ | |
be935610 | 628 | if (_dl_loaded->l_ld == NULL) |
e2102c14 | 629 | _exit (1); |
e2102c14 UD |
630 | |
631 | /* We allow here some platform specific code. */ | |
632 | #ifdef DISTINGUISH_LIB_VERSIONS | |
633 | DISTINGUISH_LIB_VERSIONS; | |
634 | #endif | |
eb406346 | 635 | _exit (has_interp ? 0 : 2); |
e2102c14 UD |
636 | } |
637 | ||
9a51759b | 638 | if (! rtld_is_main) |
97a51d8a UD |
639 | /* Initialize the data structures for the search paths for shared |
640 | objects. */ | |
120b4c49 | 641 | _dl_init_paths (library_path); |
97a51d8a | 642 | |
0200214b | 643 | /* Put the link_map for ourselves on the chain so it can be found by |
ceb2d9aa | 644 | name. Note that at this point the global chain of link maps contains |
be935610 | 645 | exactly one element, which is pointed to by _dl_loaded. */ |
ffee1316 RM |
646 | if (! _dl_rtld_map.l_name) |
647 | /* If not invoked directly, the dynamic linker shared object file was | |
648 | found by the PT_INTERP name. */ | |
c84142e8 | 649 | _dl_rtld_map.l_name = (char *) _dl_rtld_map.l_libname->name; |
ba79d61b | 650 | _dl_rtld_map.l_type = lt_library; |
be935610 UD |
651 | _dl_loaded->l_next = &_dl_rtld_map; |
652 | _dl_rtld_map.l_prev = _dl_loaded; | |
0200214b | 653 | |
14bab8de | 654 | /* We have two ways to specify objects to preload: via environment |
49c091e5 | 655 | variable and via the file /etc/ld.so.preload. The latter can also |
14bab8de | 656 | be used when security is enabled. */ |
2064087b RM |
657 | preloads = NULL; |
658 | npreloads = 0; | |
14bab8de | 659 | |
fd26970f | 660 | if (preloadlist) |
c4029823 | 661 | { |
566efee2 UD |
662 | /* The LD_PRELOAD environment variable gives list of libraries |
663 | separated by white space or colons that are loaded before the | |
fd26970f UD |
664 | executable's dependencies and prepended to the global scope |
665 | list. If the binary is running setuid all elements | |
666 | containing a '/' are ignored since it is insecure. */ | |
667 | char *list = strdupa (preloadlist); | |
668 | char *p; | |
db276fa1 UD |
669 | |
670 | HP_TIMING_NOW (start); | |
671 | ||
566efee2 | 672 | while ((p = strsep (&list, " :")) != NULL) |
e2102c14 UD |
673 | if (p[0] != '\0' |
674 | && (! __libc_enable_secure || strchr (p, '/') == NULL)) | |
fd26970f | 675 | { |
be935610 | 676 | struct link_map *new_map = _dl_map_object (_dl_loaded, p, 1, |
c6222ab9 | 677 | lt_library, 0); |
bd355af0 UD |
678 | if (new_map->l_opencount == 1) |
679 | /* It is no duplicate. */ | |
680 | ++npreloads; | |
fd26970f | 681 | } |
db276fa1 UD |
682 | |
683 | HP_TIMING_NOW (stop); | |
684 | HP_TIMING_DIFF (diff, start, stop); | |
685 | HP_TIMING_ACCUM_NT (load_time, diff); | |
c4029823 UD |
686 | } |
687 | ||
14bab8de UD |
688 | /* Read the contents of the file. */ |
689 | file = _dl_sysdep_read_whole_file ("/etc/ld.so.preload", &file_size, | |
690 | PROT_READ | PROT_WRITE); | |
691 | if (file) | |
692 | { | |
693 | /* Parse the file. It contains names of libraries to be loaded, | |
694 | separated by white spaces or `:'. It may also contain | |
695 | comments introduced by `#'. */ | |
696 | char *problem; | |
697 | char *runp; | |
698 | size_t rest; | |
699 | ||
700 | /* Eliminate comments. */ | |
701 | runp = file; | |
702 | rest = file_size; | |
703 | while (rest > 0) | |
704 | { | |
705 | char *comment = memchr (runp, '#', rest); | |
706 | if (comment == NULL) | |
707 | break; | |
708 | ||
709 | rest -= comment - runp; | |
710 | do | |
711 | *comment = ' '; | |
712 | while (--rest > 0 && *++comment != '\n'); | |
713 | } | |
714 | ||
715 | /* We have one problematic case: if we have a name at the end of | |
716 | the file without a trailing terminating characters, we cannot | |
717 | place the \0. Handle the case separately. */ | |
49891c10 UD |
718 | if (file[file_size - 1] != ' ' && file[file_size - 1] != '\t' |
719 | && file[file_size - 1] != '\n' && file[file_size - 1] != ':') | |
14bab8de UD |
720 | { |
721 | problem = &file[file_size]; | |
722 | while (problem > file && problem[-1] != ' ' && problem[-1] != '\t' | |
49891c10 | 723 | && problem[-1] != '\n' && problem[-1] != ':') |
14bab8de UD |
724 | --problem; |
725 | ||
726 | if (problem > file) | |
727 | problem[-1] = '\0'; | |
728 | } | |
729 | else | |
49891c10 UD |
730 | { |
731 | problem = NULL; | |
732 | file[file_size - 1] = '\0'; | |
733 | } | |
14bab8de | 734 | |
db276fa1 UD |
735 | HP_TIMING_NOW (start); |
736 | ||
14bab8de UD |
737 | if (file != problem) |
738 | { | |
739 | char *p; | |
e2102c14 | 740 | runp = file; |
14bab8de | 741 | while ((p = strsep (&runp, ": \t\n")) != NULL) |
e2102c14 UD |
742 | if (p[0] != '\0') |
743 | { | |
be935610 | 744 | struct link_map *new_map = _dl_map_object (_dl_loaded, p, 1, |
e2102c14 UD |
745 | lt_library, 0); |
746 | if (new_map->l_opencount == 1) | |
747 | /* It is no duplicate. */ | |
748 | ++npreloads; | |
749 | } | |
14bab8de UD |
750 | } |
751 | ||
752 | if (problem != NULL) | |
753 | { | |
754 | char *p = strndupa (problem, file_size - (problem - file)); | |
be935610 | 755 | struct link_map *new_map = _dl_map_object (_dl_loaded, p, 1, |
c6222ab9 | 756 | lt_library, 0); |
bd355af0 UD |
757 | if (new_map->l_opencount == 1) |
758 | /* It is no duplicate. */ | |
759 | ++npreloads; | |
14bab8de UD |
760 | } |
761 | ||
db276fa1 UD |
762 | HP_TIMING_NOW (stop); |
763 | HP_TIMING_DIFF (diff, start, stop); | |
764 | HP_TIMING_ACCUM_NT (load_time, diff); | |
765 | ||
14bab8de UD |
766 | /* We don't need the file anymore. */ |
767 | __munmap (file, file_size); | |
768 | } | |
769 | ||
14bab8de UD |
770 | if (npreloads != 0) |
771 | { | |
772 | /* Set up PRELOADS with a vector of the preloaded libraries. */ | |
773 | struct link_map *l; | |
14bab8de UD |
774 | preloads = __alloca (npreloads * sizeof preloads[0]); |
775 | l = _dl_rtld_map.l_next; /* End of the chain before preloads. */ | |
776 | i = 0; | |
777 | do | |
778 | { | |
779 | preloads[i++] = l; | |
780 | l = l->l_next; | |
781 | } while (l); | |
782 | assert (i == npreloads); | |
783 | } | |
784 | ||
2064087b RM |
785 | /* Load all the libraries specified by DT_NEEDED entries. If LD_PRELOAD |
786 | specified some libraries to load, these are inserted before the actual | |
787 | dependencies in the executable's searchlist for symbol resolution. */ | |
db276fa1 | 788 | HP_TIMING_NOW (start); |
d9cb1a7d | 789 | _dl_map_object_deps (_dl_loaded, preloads, npreloads, mode == trace); |
db276fa1 UD |
790 | HP_TIMING_NOW (stop); |
791 | HP_TIMING_DIFF (diff, start, stop); | |
792 | HP_TIMING_ACCUM_NT (load_time, diff); | |
e3e35cfc UD |
793 | |
794 | /* Mark all objects as being in the global scope. */ | |
795 | for (i = _dl_loaded->l_searchlist.r_nlist; i > 0; ) | |
796 | _dl_loaded->l_searchlist.r_list[--i]->l_global = 1; | |
d66e34cd | 797 | |
2064087b | 798 | #ifndef MAP_ANON |
f332db02 RM |
799 | /* We are done mapping things, so close the zero-fill descriptor. */ |
800 | __close (_dl_zerofd); | |
801 | _dl_zerofd = -1; | |
2064087b | 802 | #endif |
f332db02 | 803 | |
f9496a7b RM |
804 | /* Remove _dl_rtld_map from the chain. */ |
805 | _dl_rtld_map.l_prev->l_next = _dl_rtld_map.l_next; | |
806 | if (_dl_rtld_map.l_next) | |
807 | _dl_rtld_map.l_next->l_prev = _dl_rtld_map.l_prev; | |
808 | ||
9a821cf9 | 809 | if (__builtin_expect (_dl_rtld_map.l_opencount, 2) > 1) |
0200214b | 810 | { |
f9496a7b RM |
811 | /* Some DT_NEEDED entry referred to the interpreter object itself, so |
812 | put it back in the list of visible objects. We insert it into the | |
813 | chain in symbol search order because gdb uses the chain's order as | |
814 | its symbol search order. */ | |
77aba05b | 815 | i = 1; |
be935610 | 816 | while (_dl_loaded->l_searchlist.r_list[i] != &_dl_rtld_map) |
f9496a7b | 817 | ++i; |
be935610 | 818 | _dl_rtld_map.l_prev = _dl_loaded->l_searchlist.r_list[i - 1]; |
b2bcd61a UD |
819 | if (__builtin_expect (mode, normal) == normal) |
820 | _dl_rtld_map.l_next = (i + 1 < _dl_loaded->l_searchlist.r_nlist | |
821 | ? _dl_loaded->l_searchlist.r_list[i + 1] | |
822 | : NULL); | |
823 | else | |
824 | /* In trace mode there might be an invisible object (which we | |
825 | could not find) after the previous one in the search list. | |
826 | In this case it doesn't matter much where we put the | |
827 | interpreter object, so we just initialize the list pointer so | |
828 | that the assertion below holds. */ | |
829 | _dl_rtld_map.l_next = _dl_rtld_map.l_prev->l_next; | |
830 | ||
f9496a7b RM |
831 | assert (_dl_rtld_map.l_prev->l_next == _dl_rtld_map.l_next); |
832 | _dl_rtld_map.l_prev->l_next = &_dl_rtld_map; | |
4d02a5b1 | 833 | if (_dl_rtld_map.l_next) |
f9496a7b RM |
834 | { |
835 | assert (_dl_rtld_map.l_next->l_prev == _dl_rtld_map.l_prev); | |
836 | _dl_rtld_map.l_next->l_prev = &_dl_rtld_map; | |
837 | } | |
0200214b | 838 | } |
d66e34cd | 839 | |
c84142e8 UD |
840 | /* Now let us see whether all libraries are available in the |
841 | versions we need. */ | |
842 | { | |
993b3242 UD |
843 | struct version_check_args args; |
844 | args.doexit = mode == normal; | |
993b3242 | 845 | _dl_receive_error (print_missing_version, version_check_doit, &args); |
c84142e8 UD |
846 | } |
847 | ||
9a821cf9 | 848 | if (__builtin_expect (mode, normal) != normal) |
0200214b RM |
849 | { |
850 | /* We were run just to list the shared libraries. It is | |
851 | important that we do this before real relocation, because the | |
852 | functions we call below for output may no longer work properly | |
853 | after relocation. */ | |
0200214b RM |
854 | if (! _dl_loaded->l_info[DT_NEEDED]) |
855 | _dl_sysdep_message ("\t", "statically linked\n", NULL); | |
856 | else | |
ceb2d9aa UD |
857 | { |
858 | struct link_map *l; | |
859 | ||
860 | for (l = _dl_loaded->l_next; l; l = l->l_next) | |
861 | if (l->l_opencount == 0) | |
862 | /* The library was not found. */ | |
863 | _dl_sysdep_message ("\t", l->l_libname->name, " => not found\n", | |
864 | NULL); | |
865 | else | |
866 | { | |
867 | char buf[20], *bp; | |
868 | buf[sizeof buf - 1] = '\0'; | |
af6f3906 | 869 | bp = _itoa_word (l->l_addr, &buf[sizeof buf - 1], 16, 0); |
ceb2d9aa UD |
870 | while ((size_t) (&buf[sizeof buf - 1] - bp) |
871 | < sizeof l->l_addr * 2) | |
872 | *--bp = '0'; | |
873 | _dl_sysdep_message ("\t", l->l_libname->name, " => ", | |
874 | l->l_name, " (0x", bp, ")\n", NULL); | |
875 | } | |
876 | } | |
1a3a58fd | 877 | |
9a821cf9 | 878 | if (__builtin_expect (mode, trace) != trace) |
cddcfecf RM |
879 | for (i = 1; i < _dl_argc; ++i) |
880 | { | |
881 | const ElfW(Sym) *ref = NULL; | |
d3ac2d47 UD |
882 | ElfW(Addr) loadbase = _dl_lookup_symbol (_dl_argv[i], _dl_loaded, |
883 | &ref, _dl_loaded->l_scope, | |
a2b08ee5 | 884 | ELF_MACHINE_JMP_SLOT); |
cddcfecf RM |
885 | char buf[20], *bp; |
886 | buf[sizeof buf - 1] = '\0'; | |
af6f3906 | 887 | bp = _itoa_word (ref->st_value, &buf[sizeof buf - 1], 16, 0); |
14bab8de | 888 | while ((size_t) (&buf[sizeof buf - 1] - bp) < sizeof loadbase * 2) |
cddcfecf RM |
889 | *--bp = '0'; |
890 | _dl_sysdep_message (_dl_argv[i], " found at 0x", bp, NULL); | |
891 | buf[sizeof buf - 1] = '\0'; | |
af6f3906 | 892 | bp = _itoa_word (loadbase, &buf[sizeof buf - 1], 16, 0); |
14bab8de | 893 | while ((size_t) (&buf[sizeof buf - 1] - bp) < sizeof loadbase * 2) |
cddcfecf RM |
894 | *--bp = '0'; |
895 | _dl_sysdep_message (" in object at 0x", bp, "\n", NULL); | |
896 | } | |
ce37fa88 | 897 | else |
fd26970f | 898 | { |
12b5b6b7 | 899 | if (_dl_lazy >= 0) |
ce37fa88 UD |
900 | { |
901 | /* We have to do symbol dependency testing. */ | |
902 | struct relocate_args args; | |
903 | struct link_map *l; | |
993b3242 | 904 | |
12b5b6b7 | 905 | args.lazy = _dl_lazy; |
fd26970f | 906 | |
ce37fa88 UD |
907 | l = _dl_loaded; |
908 | while (l->l_next) | |
909 | l = l->l_next; | |
910 | do | |
911 | { | |
912 | if (l != &_dl_rtld_map && l->l_opencount > 0) | |
913 | { | |
914 | args.l = l; | |
915 | _dl_receive_error (print_unresolved, relocate_doit, | |
916 | &args); | |
ce37fa88 UD |
917 | } |
918 | l = l->l_prev; | |
919 | } while (l); | |
920 | } | |
921 | ||
922 | #define VERNEEDTAG (DT_NUM + DT_PROCNUM + DT_VERSIONTAGIDX (DT_VERNEED)) | |
120b4c49 | 923 | if (version_info) |
fd26970f | 924 | { |
ce37fa88 UD |
925 | /* Print more information. This means here, print information |
926 | about the versions needed. */ | |
927 | int first = 1; | |
928 | struct link_map *map = _dl_loaded; | |
929 | ||
930 | for (map = _dl_loaded; map != NULL; map = map->l_next) | |
fd26970f | 931 | { |
f41c8091 | 932 | const char *strtab; |
ce37fa88 | 933 | ElfW(Dyn) *dyn = map->l_info[VERNEEDTAG]; |
f41c8091 UD |
934 | ElfW(Verneed) *ent; |
935 | ||
936 | if (dyn == NULL) | |
937 | continue; | |
938 | ||
a42195db | 939 | strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
f41c8091 | 940 | ent = (ElfW(Verneed) *) (map->l_addr + dyn->d_un.d_ptr); |
ce37fa88 | 941 | |
f41c8091 | 942 | if (first) |
ce37fa88 | 943 | { |
f41c8091 UD |
944 | _dl_sysdep_message ("\n\tVersion information:\n", NULL); |
945 | first = 0; | |
946 | } | |
ce37fa88 | 947 | |
f41c8091 UD |
948 | _dl_sysdep_message ("\t", (map->l_name[0] |
949 | ? map->l_name : _dl_argv[0]), | |
950 | ":\n", NULL); | |
951 | ||
952 | while (1) | |
953 | { | |
954 | ElfW(Vernaux) *aux; | |
955 | struct link_map *needed; | |
ce37fa88 | 956 | |
f41c8091 UD |
957 | needed = find_needed (strtab + ent->vn_file); |
958 | aux = (ElfW(Vernaux) *) ((char *) ent + ent->vn_aux); | |
ce37fa88 UD |
959 | |
960 | while (1) | |
961 | { | |
f41c8091 UD |
962 | const char *fname = NULL; |
963 | ||
964 | _dl_sysdep_message ("\t\t", | |
965 | strtab + ent->vn_file, | |
966 | " (", strtab + aux->vna_name, | |
967 | ") ", | |
968 | (aux->vna_flags | |
969 | & VER_FLG_WEAK | |
970 | ? "[WEAK] " : ""), | |
971 | "=> ", NULL); | |
972 | ||
973 | if (needed != NULL | |
974 | && match_version (strtab+aux->vna_name, needed)) | |
975 | fname = needed->l_name; | |
976 | ||
977 | _dl_sysdep_message (fname ?: "not found", "\n", | |
978 | NULL); | |
ce37fa88 | 979 | |
f41c8091 UD |
980 | if (aux->vna_next == 0) |
981 | /* No more symbols. */ | |
ce37fa88 UD |
982 | break; |
983 | ||
f41c8091 UD |
984 | /* Next symbol. */ |
985 | aux = (ElfW(Vernaux) *) ((char *) aux | |
986 | + aux->vna_next); | |
ce37fa88 | 987 | } |
f41c8091 UD |
988 | |
989 | if (ent->vn_next == 0) | |
990 | /* No more dependencies. */ | |
991 | break; | |
992 | ||
993 | /* Next dependency. */ | |
994 | ent = (ElfW(Verneed) *) ((char *) ent + ent->vn_next); | |
ce37fa88 | 995 | } |
fd26970f | 996 | } |
ce37fa88 | 997 | } |
fd26970f | 998 | } |
d66e34cd | 999 | |
0200214b RM |
1000 | _exit (0); |
1001 | } | |
86d2c878 | 1002 | |
ba79d61b RM |
1003 | { |
1004 | /* Now we have all the objects loaded. Relocate them all except for | |
1005 | the dynamic linker itself. We do this in reverse order so that copy | |
1006 | relocs of earlier objects overwrite the data written by later | |
1007 | objects. We do not re-relocate the dynamic linker itself in this | |
1008 | loop because that could result in the GOT entries for functions we | |
1009 | call being changed, and that would break us. It is safe to relocate | |
1010 | the dynamic linker out of order because it has no copy relocs (we | |
1011 | know that because it is self-contained). */ | |
1012 | ||
ceb2d9aa | 1013 | struct link_map *l; |
c0fb8a56 | 1014 | int consider_profiling = _dl_profile != NULL; |
db276fa1 UD |
1015 | hp_timing_t start; |
1016 | hp_timing_t stop; | |
1017 | hp_timing_t add; | |
c0fb8a56 UD |
1018 | |
1019 | /* If we are profiling we also must do lazy reloaction. */ | |
12b5b6b7 | 1020 | _dl_lazy |= consider_profiling; |
c0fb8a56 | 1021 | |
ba79d61b RM |
1022 | l = _dl_loaded; |
1023 | while (l->l_next) | |
1024 | l = l->l_next; | |
db276fa1 UD |
1025 | |
1026 | HP_TIMING_NOW (start); | |
ba79d61b RM |
1027 | do |
1028 | { | |
1029 | if (l != &_dl_rtld_map) | |
12b5b6b7 | 1030 | _dl_relocate_object (l, l->l_scope, _dl_lazy, consider_profiling); |
be935610 | 1031 | |
ba79d61b | 1032 | l = l->l_prev; |
db276fa1 UD |
1033 | } |
1034 | while (l); | |
1035 | HP_TIMING_NOW (stop); | |
1036 | ||
1037 | HP_TIMING_DIFF (relocate_time, start, stop); | |
ba79d61b RM |
1038 | |
1039 | /* Do any necessary cleanups for the startup OS interface code. | |
1040 | We do these now so that no calls are made after rtld re-relocation | |
1041 | which might be resolved to different functions than we expect. | |
1042 | We cannot do this before relocating the other objects because | |
1043 | _dl_relocate_object might need to call `mprotect' for DT_TEXTREL. */ | |
1044 | _dl_sysdep_start_cleanup (); | |
1045 | ||
722c33bb UD |
1046 | /* Now enable profiling if needed. Like the previous call, |
1047 | this has to go here because the calls it makes should use the | |
1048 | rtld versions of the functions (particularly calloc()), but it | |
1049 | needs to have _dl_profile_map set up by the relocator. */ | |
1050 | if (_dl_profile_map != NULL) | |
1051 | /* We must prepare the profiling. */ | |
1052 | _dl_start_profile (_dl_profile_map, _dl_profile_output); | |
1053 | ||
1ca7cbcb | 1054 | if (_dl_rtld_map.l_opencount > 1) |
db276fa1 UD |
1055 | { |
1056 | /* There was an explicit ref to the dynamic linker as a shared lib. | |
1057 | Re-relocate ourselves with user-controlled symbol definitions. */ | |
1058 | HP_TIMING_NOW (start); | |
1059 | _dl_relocate_object (&_dl_rtld_map, _dl_loaded->l_scope, 0, 0); | |
1060 | HP_TIMING_NOW (stop); | |
1061 | HP_TIMING_DIFF (add, start, stop); | |
1062 | HP_TIMING_ACCUM_NT (relocate_time, add); | |
1063 | } | |
ba79d61b | 1064 | } |
ac16e905 | 1065 | |
be935610 UD |
1066 | /* Now set up the variable which helps the assembler startup code. */ |
1067 | _dl_main_searchlist = &_dl_loaded->l_searchlist; | |
1068 | _dl_global_scope[0] = &_dl_loaded->l_searchlist; | |
1069 | ||
604510f7 UD |
1070 | /* Safe the information about the original global scope list since |
1071 | we need it in the memory handling later. */ | |
1072 | _dl_initial_searchlist = *_dl_main_searchlist; | |
1073 | ||
4d6acc61 RM |
1074 | { |
1075 | /* Initialize _r_debug. */ | |
1076 | struct r_debug *r = _dl_debug_initialize (_dl_rtld_map.l_addr); | |
ceb2d9aa | 1077 | struct link_map *l; |
4d6acc61 RM |
1078 | |
1079 | l = _dl_loaded; | |
ec42724d RM |
1080 | |
1081 | #ifdef ELF_MACHINE_DEBUG_SETUP | |
1082 | ||
1083 | /* Some machines (e.g. MIPS) don't use DT_DEBUG in this way. */ | |
1084 | ||
1085 | ELF_MACHINE_DEBUG_SETUP (l, r); | |
1086 | ELF_MACHINE_DEBUG_SETUP (&_dl_rtld_map, r); | |
1087 | ||
1088 | #else | |
1089 | ||
4d6acc61 RM |
1090 | if (l->l_info[DT_DEBUG]) |
1091 | /* There is a DT_DEBUG entry in the dynamic section. Fill it in | |
1092 | with the run-time address of the r_debug structure */ | |
1093 | l->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
1094 | ||
d746b89c RM |
1095 | /* Fill in the pointer in the dynamic linker's own dynamic section, in |
1096 | case you run gdb on the dynamic linker directly. */ | |
1097 | if (_dl_rtld_map.l_info[DT_DEBUG]) | |
1098 | _dl_rtld_map.l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
1099 | ||
ec42724d RM |
1100 | #endif |
1101 | ||
4d6acc61 RM |
1102 | /* Notify the debugger that all objects are now mapped in. */ |
1103 | r->r_state = RT_ADD; | |
1104 | _dl_debug_state (); | |
1105 | } | |
0200214b | 1106 | |
08cac4ac UD |
1107 | #ifndef MAP_COPY |
1108 | /* We must munmap() the cache file. */ | |
1109 | _dl_unload_cache (); | |
1110 | #endif | |
1111 | ||
d66e34cd RM |
1112 | /* Once we return, _dl_sysdep_start will invoke |
1113 | the DT_INIT functions and then *USER_ENTRY. */ | |
1114 | } | |
fd26970f UD |
1115 | \f |
1116 | /* This is a little helper function for resolving symbols while | |
1117 | tracing the binary. */ | |
1118 | static void | |
c84142e8 UD |
1119 | print_unresolved (int errcode __attribute__ ((unused)), const char *objname, |
1120 | const char *errstring) | |
fd26970f | 1121 | { |
3996f34b UD |
1122 | if (objname[0] == '\0') |
1123 | objname = _dl_argv[0] ?: "<main program>"; | |
fd26970f UD |
1124 | _dl_sysdep_error (errstring, " (", objname, ")\n", NULL); |
1125 | } | |
c84142e8 UD |
1126 | \f |
1127 | /* This is a little helper function for resolving symbols while | |
1128 | tracing the binary. */ | |
1129 | static void | |
1130 | print_missing_version (int errcode __attribute__ ((unused)), | |
1131 | const char *objname, const char *errstring) | |
1132 | { | |
1133 | _dl_sysdep_error (_dl_argv[0] ?: "<program name unknown>", ": ", | |
1134 | objname, ": ", errstring, "\n", NULL); | |
1135 | } | |
ea278354 | 1136 | \f |
7dea968e UD |
1137 | /* Nonzero if any of the debugging options is enabled. */ |
1138 | static int any_debug; | |
1139 | ||
b5efde2f UD |
1140 | /* Process the string given as the parameter which explains which debugging |
1141 | options are enabled. */ | |
1142 | static void | |
14c44e2e | 1143 | process_dl_debug (const char *dl_debug) |
b5efde2f | 1144 | { |
14c44e2e UD |
1145 | size_t len; |
1146 | #define separators " ,:" | |
b5efde2f UD |
1147 | do |
1148 | { | |
14c44e2e | 1149 | len = 0; |
b5efde2f | 1150 | /* Skip separating white spaces and commas. */ |
14c44e2e | 1151 | dl_debug += strspn (dl_debug, separators); |
b5efde2f UD |
1152 | if (*dl_debug != '\0') |
1153 | { | |
14c44e2e UD |
1154 | len = strcspn (dl_debug, separators); |
1155 | ||
1156 | switch (len) | |
b5efde2f | 1157 | { |
b0b67c47 UD |
1158 | case 3: |
1159 | /* This option is not documented since it is not generally | |
1160 | useful. */ | |
1161 | if (memcmp (dl_debug, "all", 3) == 0) | |
1162 | { | |
1163 | _dl_debug_libs = 1; | |
1164 | _dl_debug_impcalls = 1; | |
1165 | _dl_debug_reloc = 1; | |
1166 | _dl_debug_files = 1; | |
1167 | _dl_debug_symbols = 1; | |
1168 | _dl_debug_bindings = 1; | |
1169 | _dl_debug_versions = 1; | |
1170 | any_debug = 1; | |
ceb27555 | 1171 | continue; |
b0b67c47 UD |
1172 | } |
1173 | break; | |
1174 | ||
14c44e2e UD |
1175 | case 4: |
1176 | if (memcmp (dl_debug, "help", 4) == 0) | |
1177 | { | |
1178 | _dl_sysdep_message ("\ | |
08b511e6 | 1179 | Valid options for the LD_DEBUG environment variable are:\n\ |
b5efde2f | 1180 | \n\ |
0c367d92 | 1181 | bindings display information about symbol binding\n\ |
8193034b | 1182 | files display processing of files and libraries\n\ |
0c367d92 UD |
1183 | help display this help message and exit\n\ |
1184 | libs display library search paths\n\ | |
8193034b | 1185 | reloc display relocation processing\n\ |
de100ca7 | 1186 | symbols display symbol table processing\n\ |
8193034b | 1187 | versions display version dependencies\n\ |
0c367d92 UD |
1188 | \n\ |
1189 | To direct the debugging output into a file instead of standard output\n\ | |
1190 | a filename can be specified using the LD_DEBUG_OUTPUT environment variable.\n", | |
1191 | NULL); | |
14c44e2e UD |
1192 | _exit (0); |
1193 | } | |
77aba05b | 1194 | |
14c44e2e UD |
1195 | if (memcmp (dl_debug, "libs", 4) == 0) |
1196 | { | |
1197 | _dl_debug_libs = 1; | |
1198 | _dl_debug_impcalls = 1; | |
1199 | any_debug = 1; | |
1200 | continue; | |
1201 | } | |
1202 | break; | |
1203 | ||
1204 | case 5: | |
1205 | if (memcmp (dl_debug, "reloc", 5) == 0) | |
1206 | { | |
1207 | _dl_debug_reloc = 1; | |
1208 | _dl_debug_impcalls = 1; | |
1209 | any_debug = 1; | |
1210 | continue; | |
1211 | } | |
1212 | ||
1213 | if (memcmp (dl_debug, "files", 5) == 0) | |
1214 | { | |
1215 | _dl_debug_files = 1; | |
1216 | _dl_debug_impcalls = 1; | |
1217 | any_debug = 1; | |
1218 | continue; | |
1219 | } | |
1220 | break; | |
77aba05b | 1221 | |
14c44e2e UD |
1222 | case 7: |
1223 | if (memcmp (dl_debug, "symbols", 7) == 0) | |
1224 | { | |
1225 | _dl_debug_symbols = 1; | |
1226 | _dl_debug_impcalls = 1; | |
1227 | any_debug = 1; | |
1228 | continue; | |
1229 | } | |
1230 | break; | |
77aba05b | 1231 | |
14c44e2e UD |
1232 | case 8: |
1233 | if (memcmp (dl_debug, "bindings", 8) == 0) | |
1234 | { | |
1235 | _dl_debug_bindings = 1; | |
1236 | _dl_debug_impcalls = 1; | |
1237 | any_debug = 1; | |
1238 | continue; | |
1239 | } | |
1240 | ||
1241 | if (memcmp (dl_debug, "versions", 8) == 0) | |
1242 | { | |
1243 | _dl_debug_versions = 1; | |
1244 | _dl_debug_impcalls = 1; | |
1245 | any_debug = 1; | |
1246 | continue; | |
1247 | } | |
1248 | break; | |
1249 | ||
db276fa1 UD |
1250 | case 10: |
1251 | if (memcmp (dl_debug, "statistics", 10) == 0) | |
1252 | { | |
1253 | _dl_debug_statistics = 1; | |
1254 | continue; | |
1255 | } | |
1256 | break; | |
1257 | ||
14c44e2e UD |
1258 | default: |
1259 | break; | |
77aba05b | 1260 | } |
14c44e2e UD |
1261 | |
1262 | { | |
1263 | /* Display a warning and skip everything until next separator. */ | |
1264 | char *startp = strndupa (dl_debug, len); | |
1265 | _dl_sysdep_error ("warning: debug option `", startp, | |
1266 | "' unknown; try LD_DEBUG=help\n", NULL); | |
db276fa1 | 1267 | break; |
14c44e2e | 1268 | } |
b5efde2f UD |
1269 | } |
1270 | } | |
14c44e2e | 1271 | while (*(dl_debug += len) != '\0'); |
b5efde2f UD |
1272 | } |
1273 | \f | |
ea278354 UD |
1274 | /* Process all environments variables the dynamic linker must recognize. |
1275 | Since all of them start with `LD_' we are a bit smarter while finding | |
1276 | all the entries. */ | |
1277 | static void | |
1278 | process_envvars (enum mode *modep, int *lazyp) | |
1279 | { | |
1280 | char **runp = NULL; | |
1281 | char *envline; | |
1282 | enum mode mode = normal; | |
1283 | int bind_now = 0; | |
7dea968e | 1284 | char *debug_output = NULL; |
ea278354 UD |
1285 | |
1286 | /* This is the default place for profiling data file. */ | |
1287 | _dl_profile_output = "/var/tmp"; | |
1288 | ||
1289 | while ((envline = _dl_next_ld_env_entry (&runp)) != NULL) | |
1290 | { | |
14c44e2e | 1291 | size_t len = strcspn (envline, "=") - 3; |
ea278354 | 1292 | |
14c44e2e | 1293 | switch (len) |
ea278354 | 1294 | { |
14c44e2e UD |
1295 | case 4: |
1296 | /* Warning level, verbose or not. */ | |
1297 | if (memcmp (&envline[3], "WARN", 4) == 0) | |
1298 | _dl_verbose = envline[8] != '\0'; | |
1299 | break; | |
ea278354 | 1300 | |
14c44e2e UD |
1301 | case 5: |
1302 | /* Debugging of the dynamic linker? */ | |
1303 | if (memcmp (&envline[3], "DEBUG", 5) == 0) | |
1304 | process_dl_debug (&envline[9]); | |
1305 | break; | |
b5efde2f | 1306 | |
14c44e2e UD |
1307 | case 7: |
1308 | /* Print information about versions. */ | |
1309 | if (memcmp (&envline[3], "VERBOSE", 7) == 0) | |
1310 | { | |
1311 | version_info = envline[11] != '\0'; | |
1312 | break; | |
1313 | } | |
7dea968e | 1314 | |
14c44e2e UD |
1315 | /* List of objects to be preloaded. */ |
1316 | if (memcmp (&envline[3], "PRELOAD", 7) == 0) | |
1317 | { | |
1318 | preloadlist = &envline[11]; | |
1319 | break; | |
1320 | } | |
120b4c49 | 1321 | |
14c44e2e UD |
1322 | /* Which shared object shall be profiled. */ |
1323 | if (memcmp (&envline[3], "PROFILE", 7) == 0) | |
722c33bb | 1324 | _dl_profile = &envline[11]; |
14c44e2e | 1325 | break; |
120b4c49 | 1326 | |
14c44e2e UD |
1327 | case 8: |
1328 | /* Do we bind early? */ | |
0e103c6d UD |
1329 | if (memcmp (&envline[3], "BIND_NOW", 8) == 0) |
1330 | bind_now = envline[12] != '\0'; | |
14c44e2e | 1331 | break; |
ea278354 | 1332 | |
14c44e2e UD |
1333 | case 9: |
1334 | /* Test whether we want to see the content of the auxiliary | |
1335 | array passed up from the kernel. */ | |
1336 | if (memcmp (&envline[3], "SHOW_AUXV", 9) == 0) | |
1337 | _dl_show_auxv (); | |
1338 | break; | |
ea278354 | 1339 | |
12264bd7 | 1340 | case 10: |
3081378b | 1341 | /* Mask for the important hardware capabilities. */ |
12264bd7 UD |
1342 | if (memcmp (&envline[3], "HWCAP_MASK", 10) == 0) |
1343 | _dl_hwcap_mask = strtoul (&envline[14], NULL, 0); | |
1344 | break; | |
1345 | ||
f787edde UD |
1346 | case 11: |
1347 | /* Path where the binary is found. */ | |
45769315 UD |
1348 | if (!__libc_enable_secure |
1349 | && memcmp (&envline[3], "ORIGIN_PATH", 11) == 0) | |
997a4165 | 1350 | _dl_origin_path = &envline[15]; |
f787edde UD |
1351 | break; |
1352 | ||
14c44e2e UD |
1353 | case 12: |
1354 | /* Where to place the profiling data file. */ | |
1355 | if (memcmp (&envline[3], "DEBUG_OUTPUT", 12) == 0) | |
1356 | { | |
1357 | debug_output = &envline[16]; | |
1358 | break; | |
1359 | } | |
ea278354 | 1360 | |
14c44e2e UD |
1361 | /* The library search path. */ |
1362 | if (memcmp (&envline[3], "LIBRARY_PATH", 12) == 0) | |
1363 | library_path = &envline[16]; | |
1364 | break; | |
ea278354 | 1365 | |
14c44e2e UD |
1366 | case 14: |
1367 | /* Where to place the profiling data file. */ | |
3081378b UD |
1368 | if (!__libc_enable_secure |
1369 | && memcmp (&envline[3], "PROFILE_OUTPUT", 14) == 0) | |
14c44e2e UD |
1370 | { |
1371 | _dl_profile_output = &envline[18]; | |
1372 | if (*_dl_profile_output == '\0') | |
1373 | _dl_profile_output = "/var/tmp"; | |
1374 | } | |
1375 | break; | |
120b4c49 | 1376 | |
14c44e2e UD |
1377 | case 20: |
1378 | /* The mode of the dynamic linker can be set. */ | |
1379 | if (memcmp (&envline[3], "TRACE_LOADED_OBJECTS", 20) == 0) | |
1380 | mode = trace; | |
1381 | break; | |
e2102c14 UD |
1382 | |
1383 | /* We might have some extra environment variable to handle. This | |
1384 | is tricky due to the pre-processing of the length of the name | |
1385 | in the switch statement here. The code here assumes that added | |
1386 | environment variables have a different length. */ | |
1387 | #ifdef EXTRA_LD_ENVVARS | |
1388 | EXTRA_LD_ENVVARS | |
1389 | #endif | |
ea278354 UD |
1390 | } |
1391 | } | |
1392 | ||
4bae5567 UD |
1393 | /* Extra security for SUID binaries. Remove all dangerous environment |
1394 | variables. */ | |
1395 | if (__libc_enable_secure) | |
1396 | { | |
1397 | static const char *unsecure_envvars[] = | |
1398 | { | |
1399 | #ifdef EXTRA_UNSECURE_ENVVARS | |
1400 | EXTRA_UNSECURE_ENVVARS | |
1401 | #endif | |
1402 | }; | |
1403 | size_t cnt; | |
1404 | ||
1405 | if (preloadlist != NULL) | |
1406 | unsetenv ("LD_PRELOAD"); | |
1407 | if (library_path != NULL) | |
1408 | unsetenv ("LD_LIBRARY_PATH"); | |
722c33bb UD |
1409 | if (_dl_origin_path != NULL) |
1410 | unsetenv ("LD_ORIGIN_PATH"); | |
1411 | if (debug_output != NULL) | |
1412 | unsetenv ("LD_DEBUG_OUTPUT"); | |
1413 | if (_dl_profile != NULL) | |
1414 | unsetenv ("LD_PROFILE"); | |
4bae5567 UD |
1415 | |
1416 | for (cnt = 0; | |
1417 | cnt < sizeof (unsecure_envvars) / sizeof (unsecure_envvars[0]); | |
1418 | ++cnt) | |
1419 | unsetenv (unsecure_envvars[cnt]); | |
1420 | } | |
1421 | ||
722c33bb UD |
1422 | /* The name of the object to profile cannot be empty. */ |
1423 | if (_dl_profile != NULL && *_dl_profile == '\0') | |
1424 | _dl_profile = NULL; | |
1425 | ||
7dea968e UD |
1426 | /* If we have to run the dynamic linker in debugging mode and the |
1427 | LD_DEBUG_OUTPUT environment variable is given, we write the debug | |
1428 | messages to this file. */ | |
14c44e2e | 1429 | if (any_debug && debug_output != NULL && !__libc_enable_secure) |
7dea968e | 1430 | { |
7a2fd787 UD |
1431 | size_t name_len = strlen (debug_output); |
1432 | char buf[name_len + 12]; | |
1433 | char *startp; | |
1434 | ||
1435 | buf[name_len + 11] = '\0'; | |
1436 | startp = _itoa_word (__getpid (), &buf[name_len + 11], 10, 0); | |
1437 | *--startp = '.'; | |
1438 | startp = memcpy (startp - name_len, debug_output, name_len); | |
1439 | ||
1440 | _dl_debug_fd = __open (startp, O_WRONLY | O_APPEND | O_CREAT, 0666); | |
7dea968e UD |
1441 | if (_dl_debug_fd == -1) |
1442 | /* We use standard output if opening the file failed. */ | |
1443 | _dl_debug_fd = STDOUT_FILENO; | |
1444 | } | |
1445 | ||
ea278354 UD |
1446 | /* LAZY is determined by the environment variable LD_WARN and |
1447 | LD_BIND_NOW if we trace the binary. */ | |
9a821cf9 | 1448 | if (__builtin_expect (mode, normal) == trace) |
ea278354 UD |
1449 | *lazyp = _dl_verbose ? !bind_now : -1; |
1450 | else | |
57de5037 | 1451 | *lazyp = !bind_now; |
ea278354 UD |
1452 | |
1453 | *modep = mode; | |
1454 | } | |
db276fa1 UD |
1455 | |
1456 | ||
1457 | /* Print the various times we collected. */ | |
1458 | static void | |
1459 | print_statistics (void) | |
1460 | { | |
1461 | char buf[200]; | |
1462 | char *cp; | |
1463 | char *wp; | |
1464 | ||
1465 | /* Total time rtld used. */ | |
1466 | if (HP_TIMING_AVAIL) | |
1467 | { | |
1468 | HP_TIMING_PRINT (buf, sizeof (buf), rtld_total_time); | |
1469 | _dl_debug_message (1, "\nruntime linker statistics:\n" | |
1470 | " total startup time in dynamic loader: ", | |
1471 | buf, "\n", NULL); | |
1472 | } | |
1473 | ||
1474 | /* Print relocation statistics. */ | |
1475 | if (HP_TIMING_AVAIL) | |
1476 | { | |
1477 | HP_TIMING_PRINT (buf, sizeof (buf), relocate_time); | |
1478 | _dl_debug_message (1, " time needed for relocation: ", buf, | |
1479 | NULL); | |
1480 | cp = _itoa_word ((1000 * relocate_time) / rtld_total_time, | |
1481 | buf + sizeof (buf), 10, 0); | |
1482 | wp = buf; | |
1483 | switch (buf + sizeof (buf) - cp) | |
1484 | { | |
1485 | case 3: | |
1486 | *wp++ = *cp++; | |
1487 | case 2: | |
1488 | *wp++ = *cp++; | |
1489 | case 1: | |
1490 | *wp++ = '.'; | |
1491 | *wp++ = *cp++; | |
1492 | } | |
1493 | *wp = '\0'; | |
1494 | _dl_debug_message (0, " (", buf, "%)\n", NULL); | |
1495 | } | |
1496 | ||
1497 | buf[sizeof (buf) - 1] = '\0'; | |
1498 | _dl_debug_message (1, " number of relocations: ", | |
1499 | _itoa_word (_dl_num_relocations, | |
1500 | buf + sizeof (buf) - 1, 10, 0), | |
1501 | "\n", NULL); | |
1502 | ||
1503 | /* Time spend while loading the object and the dependencies. */ | |
1504 | if (HP_TIMING_AVAIL) | |
1505 | { | |
1506 | HP_TIMING_PRINT (buf, sizeof (buf), load_time); | |
1507 | _dl_debug_message (1, " time needed to load objects: ", buf, | |
1508 | NULL); | |
1509 | cp = _itoa_word ((1000 * load_time) / rtld_total_time, | |
1510 | buf + sizeof (buf), 10, 0); | |
1511 | wp = buf; | |
1512 | switch (buf + sizeof (buf) - cp) | |
1513 | { | |
1514 | case 3: | |
1515 | *wp++ = *cp++; | |
1516 | case 2: | |
1517 | *wp++ = *cp++; | |
1518 | case 1: | |
1519 | *wp++ = '.'; | |
1520 | *wp++ = *cp++; | |
1521 | } | |
1522 | *wp = '\0'; | |
1523 | _dl_debug_message (0, " (", buf, "%)\n", NULL); | |
1524 | } | |
1525 | } |