]>
Commit | Line | Data |
---|---|---|
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; |
dec126b4 | 87 | int _dl_dynamic_weak; |
b5efde2f | 88 | int _dl_debug_libs; |
7dea968e | 89 | int _dl_debug_impcalls; |
0c367d92 | 90 | int _dl_debug_bindings; |
de100ca7 | 91 | int _dl_debug_symbols; |
8193034b UD |
92 | int _dl_debug_versions; |
93 | int _dl_debug_reloc; | |
94 | int _dl_debug_files; | |
db276fa1 | 95 | int _dl_debug_statistics; |
b0a01055 | 96 | const char *_dl_inhibit_rpath; /* RPATH values which should be |
310930c1 | 97 | ignored. */ |
f787edde | 98 | const char *_dl_origin_path; |
d66e34cd | 99 | |
be935610 UD |
100 | /* This is a pointer to the map for the main object and through it to |
101 | all loaded objects. */ | |
102 | struct link_map *_dl_loaded; | |
103 | /* Pointer to the l_searchlist element of the link map of the main object. */ | |
104 | struct r_scope_elem *_dl_main_searchlist; | |
604510f7 UD |
105 | /* Copy of the content of `_dl_main_searchlist'. */ |
106 | struct r_scope_elem _dl_initial_searchlist; | |
be935610 UD |
107 | /* Array which is used when looking up in the global scope. */ |
108 | struct r_scope_elem *_dl_global_scope[2]; | |
109 | ||
cf197e41 UD |
110 | /* During the program run we must not modify the global data of |
111 | loaded shared object simultanously in two threads. Therefore we | |
112 | protect `_dl_open' and `_dl_close' in dl-close.c. | |
113 | ||
114 | This must be a recursive lock since the initializer function of | |
115 | the loaded object might as well require a call to this function. | |
116 | At this time it is not anymore a problem to modify the tables. */ | |
117 | __libc_lock_define_initialized_recursive (, _dl_load_lock) | |
118 | ||
39778c6c UD |
119 | /* Set nonzero during loading and initialization of executable and |
120 | libraries, cleared before the executable's entry point runs. This | |
121 | must not be initialized to nonzero, because the unused dynamic | |
122 | linker loaded in for libc.so's "ld.so.1" dep will provide the | |
123 | definition seen by libc.so's initializer; that value must be zero, | |
124 | and will be since that dynamic linker's _dl_start and dl_main will | |
125 | never be called. */ | |
126 | int _dl_starting_up; | |
127 | ||
c0fb8a56 | 128 | |
266180eb RM |
129 | static void dl_main (const ElfW(Phdr) *phdr, |
130 | ElfW(Half) phent, | |
131 | ElfW(Addr) *user_entry); | |
d66e34cd | 132 | |
ee188d55 | 133 | struct link_map _dl_rtld_map; |
c84142e8 | 134 | struct libname_list _dl_rtld_libname; |
f41c8091 | 135 | struct libname_list _dl_rtld_libname2; |
86d2c878 | 136 | |
db276fa1 | 137 | /* Variable for statistics. */ |
5732c4df | 138 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
139 | static hp_timing_t rtld_total_time; |
140 | static hp_timing_t relocate_time; | |
141 | static hp_timing_t load_time; | |
5732c4df | 142 | #endif |
db276fa1 UD |
143 | extern unsigned long int _dl_num_relocations; /* in dl-lookup.c */ |
144 | ||
6a1db4ff UD |
145 | static ElfW(Addr) _dl_start_final (void *arg, struct link_map *bootstrap_map_p, |
146 | hp_timing_t start_time); | |
147 | ||
b1dbbaa4 RM |
148 | #ifdef RTLD_START |
149 | RTLD_START | |
150 | #else | |
151 | #error "sysdeps/MACHINE/dl-machine.h fails to define RTLD_START" | |
152 | #endif | |
153 | ||
ceb2d9aa | 154 | static ElfW(Addr) |
d66e34cd RM |
155 | _dl_start (void *arg) |
156 | { | |
86d2c878 | 157 | struct link_map bootstrap_map; |
db276fa1 | 158 | hp_timing_t start_time; |
264ec183 | 159 | size_t cnt; |
d66e34cd | 160 | |
b1dbbaa4 RM |
161 | /* This #define produces dynamic linking inline functions for |
162 | bootstrap relocation instead of general-purpose relocation. */ | |
163 | #define RTLD_BOOTSTRAP | |
c0282c06 UD |
164 | #define RESOLVE_MAP(sym, version, flags) \ |
165 | ((*(sym))->st_shndx == SHN_UNDEF ? 0 : &bootstrap_map) | |
50463d27 UD |
166 | #define RESOLVE(sym, version, flags) \ |
167 | ((*(sym))->st_shndx == SHN_UNDEF ? 0 : bootstrap_map.l_addr) | |
b1dbbaa4 RM |
168 | #include "dynamic-link.h" |
169 | ||
db276fa1 UD |
170 | if (HP_TIMING_INLINE && HP_TIMING_AVAIL) |
171 | HP_TIMING_NOW (start_time); | |
172 | ||
264ec183 UD |
173 | /* Partly clean the `bootstrap_map' structure up. Don't use `memset' |
174 | since it might nor be built in or inlined and we cannot make function | |
175 | calls at this point. */ | |
176 | for (cnt = 0; | |
177 | cnt < sizeof (bootstrap_map.l_info) / sizeof (bootstrap_map.l_info[0]); | |
178 | ++cnt) | |
179 | bootstrap_map.l_info[cnt] = 0; | |
180 | ||
d66e34cd | 181 | /* Figure out the run-time load address of the dynamic linker itself. */ |
86d2c878 | 182 | bootstrap_map.l_addr = elf_machine_load_address (); |
d66e34cd | 183 | |
47707456 UD |
184 | /* Read our own dynamic section and fill in the info array. */ |
185 | bootstrap_map.l_ld = (void *) bootstrap_map.l_addr + elf_machine_dynamic (); | |
d3ac2d47 | 186 | elf_get_dynamic_info (&bootstrap_map); |
d66e34cd RM |
187 | |
188 | #ifdef ELF_MACHINE_BEFORE_RTLD_RELOC | |
86d2c878 | 189 | ELF_MACHINE_BEFORE_RTLD_RELOC (bootstrap_map.l_info); |
d66e34cd RM |
190 | #endif |
191 | ||
192 | /* Relocate ourselves so we can do normal function calls and | |
193 | data access using the global offset table. */ | |
421f82e5 | 194 | |
3996f34b | 195 | ELF_DYNAMIC_RELOCATE (&bootstrap_map, 0, 0); |
ea7eb7e3 UD |
196 | /* Please note that we don't allow profiling of this object and |
197 | therefore need not test whether we have to allocate the array | |
198 | for the relocation results (as done in dl-reloc.c). */ | |
421f82e5 | 199 | |
d66e34cd RM |
200 | /* Now life is sane; we can call functions and access global data. |
201 | Set up to use the operating system facilities, and find out from | |
202 | the operating system's program loader where to find the program | |
6a1db4ff UD |
203 | header table in core. Put the rest of _dl_start into a separate |
204 | function, that way the compiler cannot put accesses to the GOT | |
205 | before ELF_DYNAMIC_RELOCATE. */ | |
c0282c06 UD |
206 | { |
207 | ElfW(Addr) entry = _dl_start_final (arg, &bootstrap_map, start_time); | |
208 | ||
209 | #ifndef ELF_MACHINE_START_ADDRESS | |
210 | # define ELF_MACHINE_START_ADDRESS(map, start) (start) | |
211 | #endif | |
212 | ||
213 | return ELF_MACHINE_START_ADDRESS (_dl_loaded, entry); | |
214 | } | |
6a1db4ff UD |
215 | } |
216 | ||
217 | ||
218 | static ElfW(Addr) | |
219 | _dl_start_final (void *arg, struct link_map *bootstrap_map_p, | |
220 | hp_timing_t start_time) | |
221 | { | |
222 | /* The use of `alloca' here looks ridiculous but it helps. The goal | |
223 | is to avoid the function from being inlined. There is no official | |
224 | way to do this so we use this trick. gcc never inlines functions | |
225 | which use `alloca'. */ | |
226 | ElfW(Addr) *start_addr = alloca (sizeof (ElfW(Addr))); | |
d66e34cd | 227 | |
db276fa1 UD |
228 | if (HP_TIMING_AVAIL) |
229 | { | |
230 | /* If it hasn't happen yet record the startup time. */ | |
231 | if (! HP_TIMING_INLINE) | |
232 | HP_TIMING_NOW (start_time); | |
233 | ||
234 | /* Initialize the timing functions. */ | |
235 | HP_TIMING_DIFF_INIT (); | |
236 | } | |
237 | ||
86d2c878 | 238 | /* Transfer data about ourselves to the permanent link_map structure. */ |
6a1db4ff UD |
239 | _dl_rtld_map.l_addr = bootstrap_map_p->l_addr; |
240 | _dl_rtld_map.l_ld = bootstrap_map_p->l_ld; | |
f41c8091 | 241 | _dl_rtld_map.l_opencount = 1; |
6a1db4ff | 242 | memcpy (_dl_rtld_map.l_info, bootstrap_map_p->l_info, |
ee188d55 RM |
243 | sizeof _dl_rtld_map.l_info); |
244 | _dl_setup_hash (&_dl_rtld_map); | |
86d2c878 | 245 | |
052b6a6c UD |
246 | /* Don't bother trying to work out how ld.so is mapped in memory. */ |
247 | _dl_rtld_map.l_map_start = ~0; | |
248 | _dl_rtld_map.l_map_end = ~0; | |
249 | ||
d66e34cd RM |
250 | /* Call the OS-dependent function to set up life so we can do things like |
251 | file access. It will call `dl_main' (below) to do all the real work | |
252 | of the dynamic linker, and then unwind our frame and run the user | |
253 | entry point on the same stack we entered on. */ | |
6a1db4ff | 254 | *start_addr = _dl_sysdep_start (arg, &dl_main); |
8b07d6a8 | 255 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
256 | if (HP_TIMING_AVAIL) |
257 | { | |
258 | hp_timing_t end_time; | |
259 | ||
260 | /* Get the current time. */ | |
261 | HP_TIMING_NOW (end_time); | |
262 | ||
263 | /* Compute the difference. */ | |
264 | HP_TIMING_DIFF (rtld_total_time, start_time, end_time); | |
265 | } | |
8b07d6a8 | 266 | #endif |
db276fa1 | 267 | |
466a0ec9 | 268 | if (__builtin_expect (_dl_debug_statistics, 0)) |
db276fa1 UD |
269 | print_statistics (); |
270 | ||
6a1db4ff | 271 | return *start_addr; |
d66e34cd RM |
272 | } |
273 | ||
d66e34cd RM |
274 | /* Now life is peachy; we can do all normal operations. |
275 | On to the real work. */ | |
276 | ||
f21acc89 | 277 | void ENTRY_POINT (void); |
d66e34cd | 278 | |
993b3242 UD |
279 | /* Some helper functions. */ |
280 | ||
281 | /* Arguments to relocate_doit. */ | |
282 | struct relocate_args | |
283 | { | |
284 | struct link_map *l; | |
285 | int lazy; | |
286 | }; | |
287 | ||
288 | struct map_args | |
289 | { | |
290 | /* Argument to map_doit. */ | |
291 | char *str; | |
292 | /* Return value of map_doit. */ | |
293 | struct link_map *main_map; | |
294 | }; | |
295 | ||
296 | /* Arguments to version_check_doit. */ | |
297 | struct version_check_args | |
298 | { | |
993b3242 | 299 | int doexit; |
145b8413 | 300 | int dotrace; |
993b3242 UD |
301 | }; |
302 | ||
303 | static void | |
304 | relocate_doit (void *a) | |
305 | { | |
306 | struct relocate_args *args = (struct relocate_args *) a; | |
307 | ||
be935610 | 308 | _dl_relocate_object (args->l, args->l->l_scope, |
c0fb8a56 | 309 | args->lazy, 0); |
993b3242 UD |
310 | } |
311 | ||
312 | static void | |
313 | map_doit (void *a) | |
314 | { | |
be935610 | 315 | struct map_args *args = (struct map_args *) a; |
c6222ab9 | 316 | args->main_map = _dl_map_object (NULL, args->str, 0, lt_library, 0); |
993b3242 UD |
317 | } |
318 | ||
319 | static void | |
320 | version_check_doit (void *a) | |
321 | { | |
be935610 | 322 | struct version_check_args *args = (struct version_check_args *) a; |
145b8413 | 323 | if (_dl_check_all_versions (_dl_loaded, 1, args->dotrace) && args->doexit) |
993b3242 UD |
324 | /* We cannot start the application. Abort now. */ |
325 | _exit (1); | |
326 | } | |
327 | ||
ce37fa88 UD |
328 | |
329 | static inline struct link_map * | |
330 | find_needed (const char *name) | |
331 | { | |
be935610 | 332 | unsigned int n = _dl_loaded->l_searchlist.r_nlist; |
ce37fa88 | 333 | |
be935610 UD |
334 | while (n-- > 0) |
335 | if (_dl_name_match_p (name, _dl_loaded->l_searchlist.r_list[n])) | |
336 | return _dl_loaded->l_searchlist.r_list[n]; | |
ce37fa88 UD |
337 | |
338 | /* Should never happen. */ | |
339 | return NULL; | |
340 | } | |
341 | ||
342 | static int | |
343 | match_version (const char *string, struct link_map *map) | |
344 | { | |
a42195db | 345 | const char *strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
ce37fa88 UD |
346 | ElfW(Verdef) *def; |
347 | ||
b0982c4a | 348 | #define VERDEFTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERDEF)) |
ce37fa88 UD |
349 | if (map->l_info[VERDEFTAG] == NULL) |
350 | /* The file has no symbol versioning. */ | |
351 | return 0; | |
352 | ||
353 | def = (ElfW(Verdef) *) ((char *) map->l_addr | |
354 | + map->l_info[VERDEFTAG]->d_un.d_ptr); | |
355 | while (1) | |
356 | { | |
357 | ElfW(Verdaux) *aux = (ElfW(Verdaux) *) ((char *) def + def->vd_aux); | |
358 | ||
359 | /* Compare the version strings. */ | |
360 | if (strcmp (string, strtab + aux->vda_name) == 0) | |
361 | /* Bingo! */ | |
362 | return 1; | |
363 | ||
364 | /* If no more definitions we failed to find what we want. */ | |
365 | if (def->vd_next == 0) | |
366 | break; | |
367 | ||
368 | /* Next definition. */ | |
369 | def = (ElfW(Verdef) *) ((char *) def + def->vd_next); | |
370 | } | |
371 | ||
372 | return 0; | |
373 | } | |
374 | ||
120b4c49 UD |
375 | static const char *library_path; /* The library search path. */ |
376 | static const char *preloadlist; /* The list preloaded objects. */ | |
377 | static int version_info; /* Nonzero if information about | |
378 | versions has to be printed. */ | |
a1a9d215 | 379 | |
d66e34cd | 380 | static void |
266180eb RM |
381 | dl_main (const ElfW(Phdr) *phdr, |
382 | ElfW(Half) phent, | |
383 | ElfW(Addr) *user_entry) | |
d66e34cd | 384 | { |
266180eb | 385 | const ElfW(Phdr) *ph; |
ea278354 | 386 | enum mode mode; |
2064087b RM |
387 | struct link_map **preloads; |
388 | unsigned int npreloads; | |
14bab8de UD |
389 | size_t file_size; |
390 | char *file; | |
2f6d1f1b | 391 | int has_interp = 0; |
77aba05b | 392 | unsigned int i; |
9a51759b | 393 | int rtld_is_main = 0; |
5732c4df | 394 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
395 | hp_timing_t start; |
396 | hp_timing_t stop; | |
397 | hp_timing_t diff; | |
5732c4df | 398 | #endif |
d66e34cd | 399 | |
ea278354 | 400 | /* Process the environment variable which control the behaviour. */ |
12b5b6b7 | 401 | process_envvars (&mode, &_dl_lazy); |
3996f34b | 402 | |
46ec036d UD |
403 | /* Set up a flag which tells we are just starting. */ |
404 | _dl_starting_up = 1; | |
405 | ||
f21acc89 | 406 | if (*user_entry == (ElfW(Addr)) &ENTRY_POINT) |
0200214b RM |
407 | { |
408 | /* Ho ho. We are not the program interpreter! We are the program | |
409 | itself! This means someone ran ld.so as a command. Well, that | |
410 | might be convenient to do sometimes. We support it by | |
411 | interpreting the args like this: | |
412 | ||
413 | ld.so PROGRAM ARGS... | |
414 | ||
415 | The first argument is the name of a file containing an ELF | |
416 | executable we will load and run with the following arguments. | |
417 | To simplify life here, PROGRAM is searched for using the | |
418 | normal rules for shared objects, rather than $PATH or anything | |
419 | like that. We just load it and use its entry point; we don't | |
420 | pay attention to its PT_INTERP command (we are the interpreter | |
421 | ourselves). This is an easy way to test a new ld.so before | |
422 | installing it. */ | |
9a51759b | 423 | rtld_is_main = 1; |
421f82e5 | 424 | |
ffee1316 RM |
425 | /* Note the place where the dynamic linker actually came from. */ |
426 | _dl_rtld_map.l_name = _dl_argv[0]; | |
6a76c115 | 427 | |
fd26970f UD |
428 | while (_dl_argc > 1) |
429 | if (! strcmp (_dl_argv[1], "--list")) | |
430 | { | |
431 | mode = list; | |
12b5b6b7 | 432 | _dl_lazy = -1; /* This means do no dependency analysis. */ |
61965e9b | 433 | |
fd26970f UD |
434 | ++_dl_skip_args; |
435 | --_dl_argc; | |
436 | ++_dl_argv; | |
437 | } | |
438 | else if (! strcmp (_dl_argv[1], "--verify")) | |
439 | { | |
440 | mode = verify; | |
6a76c115 | 441 | |
fd26970f UD |
442 | ++_dl_skip_args; |
443 | --_dl_argc; | |
444 | ++_dl_argv; | |
445 | } | |
310930c1 | 446 | else if (! strcmp (_dl_argv[1], "--library-path") && _dl_argc > 2) |
880f421f UD |
447 | { |
448 | library_path = _dl_argv[2]; | |
449 | ||
310930c1 UD |
450 | _dl_skip_args += 2; |
451 | _dl_argc -= 2; | |
452 | _dl_argv += 2; | |
453 | } | |
b0a01055 | 454 | else if (! strcmp (_dl_argv[1], "--inhibit-rpath") && _dl_argc > 2) |
310930c1 | 455 | { |
b0a01055 | 456 | _dl_inhibit_rpath = _dl_argv[2]; |
310930c1 | 457 | |
880f421f UD |
458 | _dl_skip_args += 2; |
459 | _dl_argc -= 2; | |
460 | _dl_argv += 2; | |
461 | } | |
fd26970f UD |
462 | else |
463 | break; | |
d66e34cd | 464 | |
61eb22d3 UD |
465 | /* If we have no further argument the program was called incorrectly. |
466 | Grant the user some education. */ | |
467 | if (_dl_argc < 2) | |
468 | _dl_sysdep_fatal ("\ | |
2bcf29ba | 469 | Usage: ld.so [OPTION]... EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]\n\ |
61eb22d3 UD |
470 | You have invoked `ld.so', the helper program for shared library executables.\n\ |
471 | This program usually lives in the file `/lib/ld.so', and special directives\n\ | |
472 | in executable files using ELF shared libraries tell the system's program\n\ | |
473 | loader to load the helper program from this file. This helper program loads\n\ | |
474 | the shared libraries needed by the program executable, prepares the program\n\ | |
475 | to run, and runs it. You may invoke this helper program directly from the\n\ | |
476 | command line to load and run an ELF executable file; this is like executing\n\ | |
477 | that file itself, but always uses this helper program from the file you\n\ | |
478 | specified, instead of the helper program file specified in the executable\n\ | |
479 | file you run. This is mostly of use for maintainers to test new versions\n\ | |
2bcf29ba UD |
480 | of this helper program; chances are you did not intend to run this program.\n\ |
481 | \n\ | |
b0a01055 UD |
482 | --list list all dependencies and how they are resolved\n\ |
483 | --verify verify that given object really is a dynamically linked\n\ | |
e8b1163e | 484 | object we can handle\n\ |
b0a01055 UD |
485 | --library-path PATH use given PATH instead of content of the environment\n\ |
486 | variable LD_LIBRARY_PATH\n\ | |
fcf70d41 UD |
487 | --inhibit-rpath LIST ignore RUNPATH and RPATH information in object names\n\ |
488 | in LIST\n", | |
61eb22d3 UD |
489 | NULL); |
490 | ||
0200214b RM |
491 | ++_dl_skip_args; |
492 | --_dl_argc; | |
493 | ++_dl_argv; | |
91f62ce6 | 494 | |
da832465 UD |
495 | /* Initialize the data structures for the search paths for shared |
496 | objects. */ | |
497 | _dl_init_paths (library_path); | |
498 | ||
9a821cf9 | 499 | if (__builtin_expect (mode, normal) == verify) |
2de99474 | 500 | { |
8e17ea58 UD |
501 | const char *objname; |
502 | const char *err_str = NULL; | |
993b3242 | 503 | struct map_args args; |
2de99474 | 504 | |
993b3242 | 505 | args.str = _dl_argv[0]; |
8e17ea58 UD |
506 | (void) _dl_catch_error (&objname, &err_str, map_doit, &args); |
507 | if (__builtin_expect (err_str != NULL, 0)) | |
dcf0671d | 508 | { |
ca3c0135 UD |
509 | if (err_str != _dl_out_of_memory) |
510 | free ((char *) err_str); | |
dcf0671d UD |
511 | _exit (EXIT_FAILURE); |
512 | } | |
2de99474 UD |
513 | } |
514 | else | |
db276fa1 UD |
515 | { |
516 | HP_TIMING_NOW (start); | |
517 | _dl_map_object (NULL, _dl_argv[0], 0, lt_library, 0); | |
518 | HP_TIMING_NOW (stop); | |
61e0617a | 519 | |
db276fa1 UD |
520 | HP_TIMING_DIFF (load_time, start, stop); |
521 | } | |
2de99474 | 522 | |
be935610 UD |
523 | phdr = _dl_loaded->l_phdr; |
524 | phent = _dl_loaded->l_phnum; | |
143e2b96 UD |
525 | /* We overwrite here a pointer to a malloc()ed string. But since |
526 | the malloc() implementation used at this point is the dummy | |
527 | implementations which has no real free() function it does not | |
528 | makes sense to free the old string first. */ | |
be935610 UD |
529 | _dl_loaded->l_name = (char *) ""; |
530 | *user_entry = _dl_loaded->l_entry; | |
0200214b RM |
531 | } |
532 | else | |
533 | { | |
534 | /* Create a link_map for the executable itself. | |
535 | This will be what dlopen on "" returns. */ | |
87c812c2 | 536 | _dl_new_object ((char *) "", "", lt_executable, NULL); |
be935610 | 537 | if (_dl_loaded == NULL) |
762a2918 | 538 | _dl_sysdep_fatal ("cannot allocate memory for link map\n", NULL); |
be935610 UD |
539 | _dl_loaded->l_phdr = phdr; |
540 | _dl_loaded->l_phnum = phent; | |
541 | _dl_loaded->l_entry = *user_entry; | |
542 | _dl_loaded->l_opencount = 1; | |
da832465 | 543 | |
61e0617a UD |
544 | /* At this point we are in a bit of trouble. We would have to |
545 | fill in the values for l_dev and l_ino. But in general we | |
546 | do not know where the file is. We also do not handle AT_EXECFD | |
547 | even if it would be passed up. | |
548 | ||
549 | We leave the values here defined to 0. This is normally no | |
550 | problem as the program code itself is normally no shared | |
551 | object and therefore cannot be loaded dynamically. Nothing | |
552 | prevent the use of dynamic binaries and in these situations | |
553 | we might get problems. We might not be able to find out | |
554 | whether the object is already loaded. But since there is no | |
555 | easy way out and because the dynamic binary must also not | |
556 | have an SONAME we ignore this program for now. If it becomes | |
557 | a problem we can force people using SONAMEs. */ | |
558 | ||
97a51d8a UD |
559 | /* We delay initializing the path structure until we got the dynamic |
560 | information for the program. */ | |
0200214b RM |
561 | } |
562 | ||
052b6a6c | 563 | /* It is not safe to load stuff after the main program. */ |
be935610 | 564 | _dl_loaded->l_map_end = ~0; |
052b6a6c | 565 | /* Perhaps the executable has no PT_LOAD header entries at all. */ |
be935610 | 566 | _dl_loaded->l_map_start = ~0; |
052b6a6c | 567 | |
0200214b RM |
568 | /* Scan the program header table for the dynamic section. */ |
569 | for (ph = phdr; ph < &phdr[phent]; ++ph) | |
570 | switch (ph->p_type) | |
571 | { | |
da832465 UD |
572 | case PT_PHDR: |
573 | /* Find out the load address. */ | |
be935610 | 574 | _dl_loaded->l_addr = (ElfW(Addr)) phdr - ph->p_vaddr; |
da832465 | 575 | break; |
0200214b RM |
576 | case PT_DYNAMIC: |
577 | /* This tells us where to find the dynamic section, | |
578 | which tells us everything we need to do. */ | |
be935610 | 579 | _dl_loaded->l_ld = (void *) _dl_loaded->l_addr + ph->p_vaddr; |
0200214b RM |
580 | break; |
581 | case PT_INTERP: | |
582 | /* This "interpreter segment" was used by the program loader to | |
583 | find the program interpreter, which is this program itself, the | |
584 | dynamic linker. We note what name finds us, so that a future | |
585 | dlopen call or DT_NEEDED entry, for something that wants to link | |
586 | against the dynamic linker as a shared library, will know that | |
587 | the shared object is already loaded. */ | |
be935610 UD |
588 | _dl_rtld_libname.name = ((const char *) _dl_loaded->l_addr |
589 | + ph->p_vaddr); | |
c84142e8 UD |
590 | _dl_rtld_libname.next = NULL; |
591 | _dl_rtld_map.l_libname = &_dl_rtld_libname; | |
f41c8091 UD |
592 | |
593 | /* Ordinarilly, we would get additional names for the loader from | |
594 | our DT_SONAME. This can't happen if we were actually linked as | |
595 | a static executable (detect this case when we have no DYNAMIC). | |
596 | If so, assume the filename component of the interpreter path to | |
597 | be our SONAME, and add it to our name list. */ | |
598 | if (_dl_rtld_map.l_ld == NULL) | |
599 | { | |
600 | char *p = strrchr (_dl_rtld_libname.name, '/'); | |
601 | if (p) | |
602 | { | |
603 | _dl_rtld_libname2.name = p+1; | |
604 | _dl_rtld_libname2.next = NULL; | |
605 | _dl_rtld_libname.next = &_dl_rtld_libname2; | |
606 | } | |
607 | } | |
608 | ||
2f6d1f1b | 609 | has_interp = 1; |
0200214b | 610 | break; |
052b6a6c UD |
611 | case PT_LOAD: |
612 | /* Remember where the main program starts in memory. */ | |
613 | { | |
614 | ElfW(Addr) mapstart; | |
be935610 UD |
615 | mapstart = _dl_loaded->l_addr + (ph->p_vaddr & ~(ph->p_align - 1)); |
616 | if (_dl_loaded->l_map_start > mapstart) | |
617 | _dl_loaded->l_map_start = mapstart; | |
052b6a6c UD |
618 | } |
619 | break; | |
0200214b | 620 | } |
ffee1316 | 621 | if (! _dl_rtld_map.l_libname && _dl_rtld_map.l_name) |
c84142e8 UD |
622 | { |
623 | /* We were invoked directly, so the program might not have a | |
624 | PT_INTERP. */ | |
625 | _dl_rtld_libname.name = _dl_rtld_map.l_name; | |
626 | _dl_rtld_libname.next = NULL; | |
627 | _dl_rtld_map.l_libname = &_dl_rtld_libname; | |
628 | } | |
ffee1316 RM |
629 | else |
630 | assert (_dl_rtld_map.l_libname); /* How else did we get here? */ | |
0200214b | 631 | |
9a51759b UD |
632 | if (! rtld_is_main) |
633 | { | |
634 | /* Extract the contents of the dynamic section for easy access. */ | |
d3ac2d47 | 635 | elf_get_dynamic_info (_dl_loaded); |
9a51759b UD |
636 | if (_dl_loaded->l_info[DT_HASH]) |
637 | /* Set up our cache of pointers into the hash table. */ | |
638 | _dl_setup_hash (_dl_loaded); | |
639 | } | |
0200214b | 640 | |
9a821cf9 | 641 | if (__builtin_expect (mode, normal) == verify) |
e2102c14 UD |
642 | { |
643 | /* We were called just to verify that this is a dynamic | |
644 | executable using us as the program interpreter. Exit with an | |
645 | error if we were not able to load the binary or no interpreter | |
646 | is specified (i.e., this is no dynamically linked binary. */ | |
be935610 | 647 | if (_dl_loaded->l_ld == NULL) |
e2102c14 | 648 | _exit (1); |
e2102c14 UD |
649 | |
650 | /* We allow here some platform specific code. */ | |
651 | #ifdef DISTINGUISH_LIB_VERSIONS | |
652 | DISTINGUISH_LIB_VERSIONS; | |
653 | #endif | |
eb406346 | 654 | _exit (has_interp ? 0 : 2); |
e2102c14 UD |
655 | } |
656 | ||
9a51759b | 657 | if (! rtld_is_main) |
97a51d8a UD |
658 | /* Initialize the data structures for the search paths for shared |
659 | objects. */ | |
120b4c49 | 660 | _dl_init_paths (library_path); |
97a51d8a | 661 | |
0200214b | 662 | /* Put the link_map for ourselves on the chain so it can be found by |
ceb2d9aa | 663 | name. Note that at this point the global chain of link maps contains |
be935610 | 664 | exactly one element, which is pointed to by _dl_loaded. */ |
ffee1316 RM |
665 | if (! _dl_rtld_map.l_name) |
666 | /* If not invoked directly, the dynamic linker shared object file was | |
667 | found by the PT_INTERP name. */ | |
c84142e8 | 668 | _dl_rtld_map.l_name = (char *) _dl_rtld_map.l_libname->name; |
ba79d61b | 669 | _dl_rtld_map.l_type = lt_library; |
be935610 UD |
670 | _dl_loaded->l_next = &_dl_rtld_map; |
671 | _dl_rtld_map.l_prev = _dl_loaded; | |
0200214b | 672 | |
14bab8de | 673 | /* We have two ways to specify objects to preload: via environment |
49c091e5 | 674 | variable and via the file /etc/ld.so.preload. The latter can also |
14bab8de | 675 | be used when security is enabled. */ |
2064087b RM |
676 | preloads = NULL; |
677 | npreloads = 0; | |
14bab8de | 678 | |
db33f7d4 | 679 | if (__builtin_expect (preloadlist != NULL, 0)) |
c4029823 | 680 | { |
566efee2 UD |
681 | /* The LD_PRELOAD environment variable gives list of libraries |
682 | separated by white space or colons that are loaded before the | |
fd26970f UD |
683 | executable's dependencies and prepended to the global scope |
684 | list. If the binary is running setuid all elements | |
685 | containing a '/' are ignored since it is insecure. */ | |
686 | char *list = strdupa (preloadlist); | |
687 | char *p; | |
db276fa1 UD |
688 | |
689 | HP_TIMING_NOW (start); | |
690 | ||
566efee2 | 691 | while ((p = strsep (&list, " :")) != NULL) |
e2102c14 | 692 | if (p[0] != '\0' |
db33f7d4 UD |
693 | && (__builtin_expect (! __libc_enable_secure, 1) |
694 | || strchr (p, '/') == NULL)) | |
fd26970f | 695 | { |
be935610 | 696 | struct link_map *new_map = _dl_map_object (_dl_loaded, p, 1, |
c6222ab9 | 697 | lt_library, 0); |
bd355af0 UD |
698 | if (new_map->l_opencount == 1) |
699 | /* It is no duplicate. */ | |
700 | ++npreloads; | |
fd26970f | 701 | } |
db276fa1 UD |
702 | |
703 | HP_TIMING_NOW (stop); | |
704 | HP_TIMING_DIFF (diff, start, stop); | |
705 | HP_TIMING_ACCUM_NT (load_time, diff); | |
c4029823 UD |
706 | } |
707 | ||
14bab8de UD |
708 | /* Read the contents of the file. */ |
709 | file = _dl_sysdep_read_whole_file ("/etc/ld.so.preload", &file_size, | |
710 | PROT_READ | PROT_WRITE); | |
db33f7d4 | 711 | if (__builtin_expect (file != NULL, 0)) |
14bab8de UD |
712 | { |
713 | /* Parse the file. It contains names of libraries to be loaded, | |
714 | separated by white spaces or `:'. It may also contain | |
715 | comments introduced by `#'. */ | |
716 | char *problem; | |
717 | char *runp; | |
718 | size_t rest; | |
719 | ||
720 | /* Eliminate comments. */ | |
721 | runp = file; | |
722 | rest = file_size; | |
723 | while (rest > 0) | |
724 | { | |
725 | char *comment = memchr (runp, '#', rest); | |
726 | if (comment == NULL) | |
727 | break; | |
728 | ||
729 | rest -= comment - runp; | |
730 | do | |
731 | *comment = ' '; | |
732 | while (--rest > 0 && *++comment != '\n'); | |
733 | } | |
734 | ||
735 | /* We have one problematic case: if we have a name at the end of | |
736 | the file without a trailing terminating characters, we cannot | |
737 | place the \0. Handle the case separately. */ | |
49891c10 UD |
738 | if (file[file_size - 1] != ' ' && file[file_size - 1] != '\t' |
739 | && file[file_size - 1] != '\n' && file[file_size - 1] != ':') | |
14bab8de UD |
740 | { |
741 | problem = &file[file_size]; | |
742 | while (problem > file && problem[-1] != ' ' && problem[-1] != '\t' | |
49891c10 | 743 | && problem[-1] != '\n' && problem[-1] != ':') |
14bab8de UD |
744 | --problem; |
745 | ||
746 | if (problem > file) | |
747 | problem[-1] = '\0'; | |
748 | } | |
749 | else | |
49891c10 UD |
750 | { |
751 | problem = NULL; | |
752 | file[file_size - 1] = '\0'; | |
753 | } | |
14bab8de | 754 | |
db276fa1 UD |
755 | HP_TIMING_NOW (start); |
756 | ||
14bab8de UD |
757 | if (file != problem) |
758 | { | |
759 | char *p; | |
e2102c14 | 760 | runp = file; |
14bab8de | 761 | while ((p = strsep (&runp, ": \t\n")) != NULL) |
e2102c14 UD |
762 | if (p[0] != '\0') |
763 | { | |
be935610 | 764 | struct link_map *new_map = _dl_map_object (_dl_loaded, p, 1, |
e2102c14 UD |
765 | lt_library, 0); |
766 | if (new_map->l_opencount == 1) | |
767 | /* It is no duplicate. */ | |
768 | ++npreloads; | |
769 | } | |
14bab8de UD |
770 | } |
771 | ||
772 | if (problem != NULL) | |
773 | { | |
774 | char *p = strndupa (problem, file_size - (problem - file)); | |
be935610 | 775 | struct link_map *new_map = _dl_map_object (_dl_loaded, p, 1, |
c6222ab9 | 776 | lt_library, 0); |
bd355af0 UD |
777 | if (new_map->l_opencount == 1) |
778 | /* It is no duplicate. */ | |
779 | ++npreloads; | |
14bab8de UD |
780 | } |
781 | ||
db276fa1 UD |
782 | HP_TIMING_NOW (stop); |
783 | HP_TIMING_DIFF (diff, start, stop); | |
784 | HP_TIMING_ACCUM_NT (load_time, diff); | |
785 | ||
14bab8de UD |
786 | /* We don't need the file anymore. */ |
787 | __munmap (file, file_size); | |
788 | } | |
789 | ||
db33f7d4 | 790 | if (__builtin_expect (npreloads, 0) != 0) |
14bab8de UD |
791 | { |
792 | /* Set up PRELOADS with a vector of the preloaded libraries. */ | |
793 | struct link_map *l; | |
14bab8de UD |
794 | preloads = __alloca (npreloads * sizeof preloads[0]); |
795 | l = _dl_rtld_map.l_next; /* End of the chain before preloads. */ | |
796 | i = 0; | |
797 | do | |
798 | { | |
799 | preloads[i++] = l; | |
800 | l = l->l_next; | |
801 | } while (l); | |
802 | assert (i == npreloads); | |
803 | } | |
804 | ||
2064087b RM |
805 | /* Load all the libraries specified by DT_NEEDED entries. If LD_PRELOAD |
806 | specified some libraries to load, these are inserted before the actual | |
807 | dependencies in the executable's searchlist for symbol resolution. */ | |
db276fa1 | 808 | HP_TIMING_NOW (start); |
d9cb1a7d | 809 | _dl_map_object_deps (_dl_loaded, preloads, npreloads, mode == trace); |
db276fa1 UD |
810 | HP_TIMING_NOW (stop); |
811 | HP_TIMING_DIFF (diff, start, stop); | |
812 | HP_TIMING_ACCUM_NT (load_time, diff); | |
e3e35cfc UD |
813 | |
814 | /* Mark all objects as being in the global scope. */ | |
815 | for (i = _dl_loaded->l_searchlist.r_nlist; i > 0; ) | |
816 | _dl_loaded->l_searchlist.r_list[--i]->l_global = 1; | |
d66e34cd | 817 | |
2064087b | 818 | #ifndef MAP_ANON |
f332db02 RM |
819 | /* We are done mapping things, so close the zero-fill descriptor. */ |
820 | __close (_dl_zerofd); | |
821 | _dl_zerofd = -1; | |
2064087b | 822 | #endif |
f332db02 | 823 | |
f9496a7b RM |
824 | /* Remove _dl_rtld_map from the chain. */ |
825 | _dl_rtld_map.l_prev->l_next = _dl_rtld_map.l_next; | |
826 | if (_dl_rtld_map.l_next) | |
827 | _dl_rtld_map.l_next->l_prev = _dl_rtld_map.l_prev; | |
828 | ||
9a821cf9 | 829 | if (__builtin_expect (_dl_rtld_map.l_opencount, 2) > 1) |
0200214b | 830 | { |
f9496a7b RM |
831 | /* Some DT_NEEDED entry referred to the interpreter object itself, so |
832 | put it back in the list of visible objects. We insert it into the | |
833 | chain in symbol search order because gdb uses the chain's order as | |
834 | its symbol search order. */ | |
77aba05b | 835 | i = 1; |
be935610 | 836 | while (_dl_loaded->l_searchlist.r_list[i] != &_dl_rtld_map) |
f9496a7b | 837 | ++i; |
be935610 | 838 | _dl_rtld_map.l_prev = _dl_loaded->l_searchlist.r_list[i - 1]; |
b2bcd61a UD |
839 | if (__builtin_expect (mode, normal) == normal) |
840 | _dl_rtld_map.l_next = (i + 1 < _dl_loaded->l_searchlist.r_nlist | |
841 | ? _dl_loaded->l_searchlist.r_list[i + 1] | |
842 | : NULL); | |
843 | else | |
844 | /* In trace mode there might be an invisible object (which we | |
845 | could not find) after the previous one in the search list. | |
846 | In this case it doesn't matter much where we put the | |
847 | interpreter object, so we just initialize the list pointer so | |
848 | that the assertion below holds. */ | |
849 | _dl_rtld_map.l_next = _dl_rtld_map.l_prev->l_next; | |
850 | ||
f9496a7b RM |
851 | assert (_dl_rtld_map.l_prev->l_next == _dl_rtld_map.l_next); |
852 | _dl_rtld_map.l_prev->l_next = &_dl_rtld_map; | |
4d02a5b1 | 853 | if (_dl_rtld_map.l_next) |
f9496a7b RM |
854 | { |
855 | assert (_dl_rtld_map.l_next->l_prev == _dl_rtld_map.l_prev); | |
856 | _dl_rtld_map.l_next->l_prev = &_dl_rtld_map; | |
857 | } | |
0200214b | 858 | } |
d66e34cd | 859 | |
c84142e8 UD |
860 | /* Now let us see whether all libraries are available in the |
861 | versions we need. */ | |
862 | { | |
993b3242 UD |
863 | struct version_check_args args; |
864 | args.doexit = mode == normal; | |
145b8413 | 865 | args.dotrace = mode == trace; |
993b3242 | 866 | _dl_receive_error (print_missing_version, version_check_doit, &args); |
c84142e8 UD |
867 | } |
868 | ||
9a821cf9 | 869 | if (__builtin_expect (mode, normal) != normal) |
0200214b RM |
870 | { |
871 | /* We were run just to list the shared libraries. It is | |
872 | important that we do this before real relocation, because the | |
873 | functions we call below for output may no longer work properly | |
874 | after relocation. */ | |
0200214b RM |
875 | if (! _dl_loaded->l_info[DT_NEEDED]) |
876 | _dl_sysdep_message ("\t", "statically linked\n", NULL); | |
877 | else | |
ceb2d9aa UD |
878 | { |
879 | struct link_map *l; | |
880 | ||
881 | for (l = _dl_loaded->l_next; l; l = l->l_next) | |
882 | if (l->l_opencount == 0) | |
883 | /* The library was not found. */ | |
884 | _dl_sysdep_message ("\t", l->l_libname->name, " => not found\n", | |
885 | NULL); | |
886 | else | |
887 | { | |
888 | char buf[20], *bp; | |
889 | buf[sizeof buf - 1] = '\0'; | |
af6f3906 | 890 | bp = _itoa_word (l->l_addr, &buf[sizeof buf - 1], 16, 0); |
ceb2d9aa UD |
891 | while ((size_t) (&buf[sizeof buf - 1] - bp) |
892 | < sizeof l->l_addr * 2) | |
893 | *--bp = '0'; | |
894 | _dl_sysdep_message ("\t", l->l_libname->name, " => ", | |
895 | l->l_name, " (0x", bp, ")\n", NULL); | |
896 | } | |
897 | } | |
1a3a58fd | 898 | |
9a821cf9 | 899 | if (__builtin_expect (mode, trace) != trace) |
cddcfecf RM |
900 | for (i = 1; i < _dl_argc; ++i) |
901 | { | |
902 | const ElfW(Sym) *ref = NULL; | |
c0282c06 UD |
903 | ElfW(Addr) loadbase; |
904 | lookup_t result; | |
cddcfecf | 905 | char buf[20], *bp; |
c0282c06 UD |
906 | |
907 | result = _dl_lookup_symbol (_dl_argv[i], _dl_loaded, | |
908 | &ref, _dl_loaded->l_scope, | |
909 | ELF_MACHINE_JMP_SLOT); | |
910 | ||
911 | loadbase = LOOKUP_VALUE_ADDRESS (result); | |
912 | ||
cddcfecf | 913 | buf[sizeof buf - 1] = '\0'; |
af6f3906 | 914 | bp = _itoa_word (ref->st_value, &buf[sizeof buf - 1], 16, 0); |
14bab8de | 915 | while ((size_t) (&buf[sizeof buf - 1] - bp) < sizeof loadbase * 2) |
cddcfecf RM |
916 | *--bp = '0'; |
917 | _dl_sysdep_message (_dl_argv[i], " found at 0x", bp, NULL); | |
918 | buf[sizeof buf - 1] = '\0'; | |
af6f3906 | 919 | bp = _itoa_word (loadbase, &buf[sizeof buf - 1], 16, 0); |
14bab8de | 920 | while ((size_t) (&buf[sizeof buf - 1] - bp) < sizeof loadbase * 2) |
cddcfecf RM |
921 | *--bp = '0'; |
922 | _dl_sysdep_message (" in object at 0x", bp, "\n", NULL); | |
923 | } | |
ce37fa88 | 924 | else |
fd26970f | 925 | { |
12b5b6b7 | 926 | if (_dl_lazy >= 0) |
ce37fa88 UD |
927 | { |
928 | /* We have to do symbol dependency testing. */ | |
929 | struct relocate_args args; | |
930 | struct link_map *l; | |
993b3242 | 931 | |
12b5b6b7 | 932 | args.lazy = _dl_lazy; |
fd26970f | 933 | |
ce37fa88 UD |
934 | l = _dl_loaded; |
935 | while (l->l_next) | |
936 | l = l->l_next; | |
937 | do | |
938 | { | |
939 | if (l != &_dl_rtld_map && l->l_opencount > 0) | |
940 | { | |
941 | args.l = l; | |
942 | _dl_receive_error (print_unresolved, relocate_doit, | |
943 | &args); | |
ce37fa88 UD |
944 | } |
945 | l = l->l_prev; | |
946 | } while (l); | |
947 | } | |
948 | ||
b0982c4a | 949 | #define VERNEEDTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERNEED)) |
120b4c49 | 950 | if (version_info) |
fd26970f | 951 | { |
ce37fa88 UD |
952 | /* Print more information. This means here, print information |
953 | about the versions needed. */ | |
954 | int first = 1; | |
955 | struct link_map *map = _dl_loaded; | |
956 | ||
957 | for (map = _dl_loaded; map != NULL; map = map->l_next) | |
fd26970f | 958 | { |
f41c8091 | 959 | const char *strtab; |
ce37fa88 | 960 | ElfW(Dyn) *dyn = map->l_info[VERNEEDTAG]; |
f41c8091 UD |
961 | ElfW(Verneed) *ent; |
962 | ||
963 | if (dyn == NULL) | |
964 | continue; | |
965 | ||
a42195db | 966 | strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
f41c8091 | 967 | ent = (ElfW(Verneed) *) (map->l_addr + dyn->d_un.d_ptr); |
ce37fa88 | 968 | |
f41c8091 | 969 | if (first) |
ce37fa88 | 970 | { |
f41c8091 UD |
971 | _dl_sysdep_message ("\n\tVersion information:\n", NULL); |
972 | first = 0; | |
973 | } | |
ce37fa88 | 974 | |
f41c8091 UD |
975 | _dl_sysdep_message ("\t", (map->l_name[0] |
976 | ? map->l_name : _dl_argv[0]), | |
977 | ":\n", NULL); | |
978 | ||
979 | while (1) | |
980 | { | |
981 | ElfW(Vernaux) *aux; | |
982 | struct link_map *needed; | |
ce37fa88 | 983 | |
f41c8091 UD |
984 | needed = find_needed (strtab + ent->vn_file); |
985 | aux = (ElfW(Vernaux) *) ((char *) ent + ent->vn_aux); | |
ce37fa88 UD |
986 | |
987 | while (1) | |
988 | { | |
f41c8091 UD |
989 | const char *fname = NULL; |
990 | ||
991 | _dl_sysdep_message ("\t\t", | |
992 | strtab + ent->vn_file, | |
993 | " (", strtab + aux->vna_name, | |
994 | ") ", | |
995 | (aux->vna_flags | |
996 | & VER_FLG_WEAK | |
997 | ? "[WEAK] " : ""), | |
998 | "=> ", NULL); | |
999 | ||
1000 | if (needed != NULL | |
1001 | && match_version (strtab+aux->vna_name, needed)) | |
1002 | fname = needed->l_name; | |
1003 | ||
1004 | _dl_sysdep_message (fname ?: "not found", "\n", | |
1005 | NULL); | |
ce37fa88 | 1006 | |
f41c8091 UD |
1007 | if (aux->vna_next == 0) |
1008 | /* No more symbols. */ | |
ce37fa88 UD |
1009 | break; |
1010 | ||
f41c8091 UD |
1011 | /* Next symbol. */ |
1012 | aux = (ElfW(Vernaux) *) ((char *) aux | |
1013 | + aux->vna_next); | |
ce37fa88 | 1014 | } |
f41c8091 UD |
1015 | |
1016 | if (ent->vn_next == 0) | |
1017 | /* No more dependencies. */ | |
1018 | break; | |
1019 | ||
1020 | /* Next dependency. */ | |
1021 | ent = (ElfW(Verneed) *) ((char *) ent + ent->vn_next); | |
ce37fa88 | 1022 | } |
fd26970f | 1023 | } |
ce37fa88 | 1024 | } |
fd26970f | 1025 | } |
d66e34cd | 1026 | |
0200214b RM |
1027 | _exit (0); |
1028 | } | |
86d2c878 | 1029 | |
ba79d61b RM |
1030 | { |
1031 | /* Now we have all the objects loaded. Relocate them all except for | |
1032 | the dynamic linker itself. We do this in reverse order so that copy | |
1033 | relocs of earlier objects overwrite the data written by later | |
1034 | objects. We do not re-relocate the dynamic linker itself in this | |
1035 | loop because that could result in the GOT entries for functions we | |
1036 | call being changed, and that would break us. It is safe to relocate | |
1037 | the dynamic linker out of order because it has no copy relocs (we | |
1038 | know that because it is self-contained). */ | |
1039 | ||
ceb2d9aa | 1040 | struct link_map *l; |
c0fb8a56 | 1041 | int consider_profiling = _dl_profile != NULL; |
8b07d6a8 | 1042 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
1043 | hp_timing_t start; |
1044 | hp_timing_t stop; | |
1045 | hp_timing_t add; | |
8b07d6a8 | 1046 | #endif |
c0fb8a56 UD |
1047 | |
1048 | /* If we are profiling we also must do lazy reloaction. */ | |
12b5b6b7 | 1049 | _dl_lazy |= consider_profiling; |
c0fb8a56 | 1050 | |
ba79d61b RM |
1051 | l = _dl_loaded; |
1052 | while (l->l_next) | |
1053 | l = l->l_next; | |
db276fa1 UD |
1054 | |
1055 | HP_TIMING_NOW (start); | |
ba79d61b RM |
1056 | do |
1057 | { | |
1058 | if (l != &_dl_rtld_map) | |
12b5b6b7 | 1059 | _dl_relocate_object (l, l->l_scope, _dl_lazy, consider_profiling); |
be935610 | 1060 | |
ba79d61b | 1061 | l = l->l_prev; |
db276fa1 UD |
1062 | } |
1063 | while (l); | |
1064 | HP_TIMING_NOW (stop); | |
1065 | ||
1066 | HP_TIMING_DIFF (relocate_time, start, stop); | |
ba79d61b RM |
1067 | |
1068 | /* Do any necessary cleanups for the startup OS interface code. | |
1069 | We do these now so that no calls are made after rtld re-relocation | |
1070 | which might be resolved to different functions than we expect. | |
1071 | We cannot do this before relocating the other objects because | |
1072 | _dl_relocate_object might need to call `mprotect' for DT_TEXTREL. */ | |
1073 | _dl_sysdep_start_cleanup (); | |
1074 | ||
722c33bb UD |
1075 | /* Now enable profiling if needed. Like the previous call, |
1076 | this has to go here because the calls it makes should use the | |
1077 | rtld versions of the functions (particularly calloc()), but it | |
1078 | needs to have _dl_profile_map set up by the relocator. */ | |
db33f7d4 | 1079 | if (__builtin_expect (_dl_profile_map != NULL, 0)) |
722c33bb UD |
1080 | /* We must prepare the profiling. */ |
1081 | _dl_start_profile (_dl_profile_map, _dl_profile_output); | |
1082 | ||
1ca7cbcb | 1083 | if (_dl_rtld_map.l_opencount > 1) |
db276fa1 UD |
1084 | { |
1085 | /* There was an explicit ref to the dynamic linker as a shared lib. | |
1086 | Re-relocate ourselves with user-controlled symbol definitions. */ | |
1087 | HP_TIMING_NOW (start); | |
1088 | _dl_relocate_object (&_dl_rtld_map, _dl_loaded->l_scope, 0, 0); | |
1089 | HP_TIMING_NOW (stop); | |
1090 | HP_TIMING_DIFF (add, start, stop); | |
1091 | HP_TIMING_ACCUM_NT (relocate_time, add); | |
1092 | } | |
ba79d61b | 1093 | } |
ac16e905 | 1094 | |
be935610 UD |
1095 | /* Now set up the variable which helps the assembler startup code. */ |
1096 | _dl_main_searchlist = &_dl_loaded->l_searchlist; | |
1097 | _dl_global_scope[0] = &_dl_loaded->l_searchlist; | |
1098 | ||
604510f7 UD |
1099 | /* Safe the information about the original global scope list since |
1100 | we need it in the memory handling later. */ | |
1101 | _dl_initial_searchlist = *_dl_main_searchlist; | |
1102 | ||
4d6acc61 RM |
1103 | { |
1104 | /* Initialize _r_debug. */ | |
1105 | struct r_debug *r = _dl_debug_initialize (_dl_rtld_map.l_addr); | |
ceb2d9aa | 1106 | struct link_map *l; |
4d6acc61 RM |
1107 | |
1108 | l = _dl_loaded; | |
ec42724d RM |
1109 | |
1110 | #ifdef ELF_MACHINE_DEBUG_SETUP | |
1111 | ||
1112 | /* Some machines (e.g. MIPS) don't use DT_DEBUG in this way. */ | |
1113 | ||
1114 | ELF_MACHINE_DEBUG_SETUP (l, r); | |
1115 | ELF_MACHINE_DEBUG_SETUP (&_dl_rtld_map, r); | |
1116 | ||
1117 | #else | |
1118 | ||
4d6acc61 RM |
1119 | if (l->l_info[DT_DEBUG]) |
1120 | /* There is a DT_DEBUG entry in the dynamic section. Fill it in | |
1121 | with the run-time address of the r_debug structure */ | |
1122 | l->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
1123 | ||
d746b89c RM |
1124 | /* Fill in the pointer in the dynamic linker's own dynamic section, in |
1125 | case you run gdb on the dynamic linker directly. */ | |
1126 | if (_dl_rtld_map.l_info[DT_DEBUG]) | |
1127 | _dl_rtld_map.l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
1128 | ||
ec42724d RM |
1129 | #endif |
1130 | ||
4d6acc61 RM |
1131 | /* Notify the debugger that all objects are now mapped in. */ |
1132 | r->r_state = RT_ADD; | |
1133 | _dl_debug_state (); | |
1134 | } | |
0200214b | 1135 | |
08cac4ac UD |
1136 | #ifndef MAP_COPY |
1137 | /* We must munmap() the cache file. */ | |
1138 | _dl_unload_cache (); | |
1139 | #endif | |
1140 | ||
d66e34cd RM |
1141 | /* Once we return, _dl_sysdep_start will invoke |
1142 | the DT_INIT functions and then *USER_ENTRY. */ | |
1143 | } | |
fd26970f UD |
1144 | \f |
1145 | /* This is a little helper function for resolving symbols while | |
1146 | tracing the binary. */ | |
1147 | static void | |
c84142e8 UD |
1148 | print_unresolved (int errcode __attribute__ ((unused)), const char *objname, |
1149 | const char *errstring) | |
fd26970f | 1150 | { |
3996f34b UD |
1151 | if (objname[0] == '\0') |
1152 | objname = _dl_argv[0] ?: "<main program>"; | |
fd26970f UD |
1153 | _dl_sysdep_error (errstring, " (", objname, ")\n", NULL); |
1154 | } | |
c84142e8 UD |
1155 | \f |
1156 | /* This is a little helper function for resolving symbols while | |
1157 | tracing the binary. */ | |
1158 | static void | |
1159 | print_missing_version (int errcode __attribute__ ((unused)), | |
1160 | const char *objname, const char *errstring) | |
1161 | { | |
1162 | _dl_sysdep_error (_dl_argv[0] ?: "<program name unknown>", ": ", | |
1163 | objname, ": ", errstring, "\n", NULL); | |
1164 | } | |
ea278354 | 1165 | \f |
7dea968e UD |
1166 | /* Nonzero if any of the debugging options is enabled. */ |
1167 | static int any_debug; | |
1168 | ||
b5efde2f UD |
1169 | /* Process the string given as the parameter which explains which debugging |
1170 | options are enabled. */ | |
1171 | static void | |
14c44e2e | 1172 | process_dl_debug (const char *dl_debug) |
b5efde2f | 1173 | { |
14c44e2e UD |
1174 | size_t len; |
1175 | #define separators " ,:" | |
b5efde2f UD |
1176 | do |
1177 | { | |
14c44e2e | 1178 | len = 0; |
b5efde2f | 1179 | /* Skip separating white spaces and commas. */ |
14c44e2e | 1180 | dl_debug += strspn (dl_debug, separators); |
b5efde2f UD |
1181 | if (*dl_debug != '\0') |
1182 | { | |
14c44e2e UD |
1183 | len = strcspn (dl_debug, separators); |
1184 | ||
1185 | switch (len) | |
b5efde2f | 1186 | { |
b0b67c47 UD |
1187 | case 3: |
1188 | /* This option is not documented since it is not generally | |
1189 | useful. */ | |
1190 | if (memcmp (dl_debug, "all", 3) == 0) | |
1191 | { | |
1192 | _dl_debug_libs = 1; | |
1193 | _dl_debug_impcalls = 1; | |
1194 | _dl_debug_reloc = 1; | |
1195 | _dl_debug_files = 1; | |
1196 | _dl_debug_symbols = 1; | |
1197 | _dl_debug_bindings = 1; | |
1198 | _dl_debug_versions = 1; | |
1199 | any_debug = 1; | |
ceb27555 | 1200 | continue; |
b0b67c47 UD |
1201 | } |
1202 | break; | |
1203 | ||
14c44e2e UD |
1204 | case 4: |
1205 | if (memcmp (dl_debug, "help", 4) == 0) | |
1206 | { | |
1207 | _dl_sysdep_message ("\ | |
08b511e6 | 1208 | Valid options for the LD_DEBUG environment variable are:\n\ |
b5efde2f | 1209 | \n\ |
5732c4df UD |
1210 | bindings display information about symbol binding\n\ |
1211 | files display processing of files and libraries\n\ | |
1212 | help display this help message and exit\n\ | |
1213 | libs display library search paths\n\ | |
dc911631 UD |
1214 | reloc display relocation processing\n\ |
1215 | statistics display relocation statistics\n\ | |
1216 | symbols display symbol table processing\n\ | |
5732c4df | 1217 | versions display version dependencies\n\ |
0c367d92 UD |
1218 | \n\ |
1219 | To direct the debugging output into a file instead of standard output\n\ | |
1220 | a filename can be specified using the LD_DEBUG_OUTPUT environment variable.\n", | |
1221 | NULL); | |
14c44e2e UD |
1222 | _exit (0); |
1223 | } | |
77aba05b | 1224 | |
14c44e2e UD |
1225 | if (memcmp (dl_debug, "libs", 4) == 0) |
1226 | { | |
1227 | _dl_debug_libs = 1; | |
1228 | _dl_debug_impcalls = 1; | |
1229 | any_debug = 1; | |
1230 | continue; | |
1231 | } | |
1232 | break; | |
1233 | ||
1234 | case 5: | |
1235 | if (memcmp (dl_debug, "reloc", 5) == 0) | |
1236 | { | |
1237 | _dl_debug_reloc = 1; | |
1238 | _dl_debug_impcalls = 1; | |
1239 | any_debug = 1; | |
1240 | continue; | |
1241 | } | |
1242 | ||
1243 | if (memcmp (dl_debug, "files", 5) == 0) | |
1244 | { | |
1245 | _dl_debug_files = 1; | |
1246 | _dl_debug_impcalls = 1; | |
1247 | any_debug = 1; | |
1248 | continue; | |
1249 | } | |
1250 | break; | |
77aba05b | 1251 | |
14c44e2e UD |
1252 | case 7: |
1253 | if (memcmp (dl_debug, "symbols", 7) == 0) | |
1254 | { | |
1255 | _dl_debug_symbols = 1; | |
1256 | _dl_debug_impcalls = 1; | |
1257 | any_debug = 1; | |
1258 | continue; | |
1259 | } | |
1260 | break; | |
77aba05b | 1261 | |
14c44e2e UD |
1262 | case 8: |
1263 | if (memcmp (dl_debug, "bindings", 8) == 0) | |
1264 | { | |
1265 | _dl_debug_bindings = 1; | |
1266 | _dl_debug_impcalls = 1; | |
1267 | any_debug = 1; | |
1268 | continue; | |
1269 | } | |
1270 | ||
1271 | if (memcmp (dl_debug, "versions", 8) == 0) | |
1272 | { | |
1273 | _dl_debug_versions = 1; | |
1274 | _dl_debug_impcalls = 1; | |
1275 | any_debug = 1; | |
1276 | continue; | |
1277 | } | |
1278 | break; | |
1279 | ||
db276fa1 UD |
1280 | case 10: |
1281 | if (memcmp (dl_debug, "statistics", 10) == 0) | |
1282 | { | |
1283 | _dl_debug_statistics = 1; | |
1284 | continue; | |
1285 | } | |
1286 | break; | |
1287 | ||
14c44e2e UD |
1288 | default: |
1289 | break; | |
77aba05b | 1290 | } |
14c44e2e UD |
1291 | |
1292 | { | |
1293 | /* Display a warning and skip everything until next separator. */ | |
1294 | char *startp = strndupa (dl_debug, len); | |
1295 | _dl_sysdep_error ("warning: debug option `", startp, | |
1296 | "' unknown; try LD_DEBUG=help\n", NULL); | |
db276fa1 | 1297 | break; |
14c44e2e | 1298 | } |
b5efde2f UD |
1299 | } |
1300 | } | |
14c44e2e | 1301 | while (*(dl_debug += len) != '\0'); |
b5efde2f UD |
1302 | } |
1303 | \f | |
ea278354 UD |
1304 | /* Process all environments variables the dynamic linker must recognize. |
1305 | Since all of them start with `LD_' we are a bit smarter while finding | |
1306 | all the entries. */ | |
1307 | static void | |
1308 | process_envvars (enum mode *modep, int *lazyp) | |
1309 | { | |
1310 | char **runp = NULL; | |
1311 | char *envline; | |
1312 | enum mode mode = normal; | |
1313 | int bind_now = 0; | |
7dea968e | 1314 | char *debug_output = NULL; |
ea278354 UD |
1315 | |
1316 | /* This is the default place for profiling data file. */ | |
1317 | _dl_profile_output = "/var/tmp"; | |
1318 | ||
1319 | while ((envline = _dl_next_ld_env_entry (&runp)) != NULL) | |
1320 | { | |
75e8d1f5 | 1321 | size_t len = strcspn (envline, "="); |
ea278354 | 1322 | |
75e8d1f5 UD |
1323 | if (envline[len] != '=') |
1324 | /* This is a "LD_" variable at the end of the string without | |
1325 | a '=' character. Ignore it since otherwise we will access | |
1326 | invalid memory below. */ | |
1327 | break; | |
1328 | ||
1329 | switch (len - 3) | |
ea278354 | 1330 | { |
14c44e2e UD |
1331 | case 4: |
1332 | /* Warning level, verbose or not. */ | |
1333 | if (memcmp (&envline[3], "WARN", 4) == 0) | |
1334 | _dl_verbose = envline[8] != '\0'; | |
1335 | break; | |
ea278354 | 1336 | |
14c44e2e UD |
1337 | case 5: |
1338 | /* Debugging of the dynamic linker? */ | |
1339 | if (memcmp (&envline[3], "DEBUG", 5) == 0) | |
1340 | process_dl_debug (&envline[9]); | |
1341 | break; | |
b5efde2f | 1342 | |
14c44e2e UD |
1343 | case 7: |
1344 | /* Print information about versions. */ | |
1345 | if (memcmp (&envline[3], "VERBOSE", 7) == 0) | |
1346 | { | |
1347 | version_info = envline[11] != '\0'; | |
1348 | break; | |
1349 | } | |
7dea968e | 1350 | |
14c44e2e UD |
1351 | /* List of objects to be preloaded. */ |
1352 | if (memcmp (&envline[3], "PRELOAD", 7) == 0) | |
1353 | { | |
1354 | preloadlist = &envline[11]; | |
1355 | break; | |
1356 | } | |
120b4c49 | 1357 | |
14c44e2e UD |
1358 | /* Which shared object shall be profiled. */ |
1359 | if (memcmp (&envline[3], "PROFILE", 7) == 0) | |
722c33bb | 1360 | _dl_profile = &envline[11]; |
14c44e2e | 1361 | break; |
120b4c49 | 1362 | |
14c44e2e UD |
1363 | case 8: |
1364 | /* Do we bind early? */ | |
0e103c6d UD |
1365 | if (memcmp (&envline[3], "BIND_NOW", 8) == 0) |
1366 | bind_now = envline[12] != '\0'; | |
14c44e2e | 1367 | break; |
ea278354 | 1368 | |
14c44e2e UD |
1369 | case 9: |
1370 | /* Test whether we want to see the content of the auxiliary | |
1371 | array passed up from the kernel. */ | |
1372 | if (memcmp (&envline[3], "SHOW_AUXV", 9) == 0) | |
1373 | _dl_show_auxv (); | |
1374 | break; | |
ea278354 | 1375 | |
12264bd7 | 1376 | case 10: |
3081378b | 1377 | /* Mask for the important hardware capabilities. */ |
12264bd7 UD |
1378 | if (memcmp (&envline[3], "HWCAP_MASK", 10) == 0) |
1379 | _dl_hwcap_mask = strtoul (&envline[14], NULL, 0); | |
1380 | break; | |
1381 | ||
f787edde UD |
1382 | case 11: |
1383 | /* Path where the binary is found. */ | |
45769315 UD |
1384 | if (!__libc_enable_secure |
1385 | && memcmp (&envline[3], "ORIGIN_PATH", 11) == 0) | |
997a4165 | 1386 | _dl_origin_path = &envline[15]; |
f787edde UD |
1387 | break; |
1388 | ||
14c44e2e | 1389 | case 12: |
dec126b4 UD |
1390 | /* The library search path. */ |
1391 | if (memcmp (&envline[3], "LIBRARY_PATH", 12) == 0) | |
1392 | { | |
1393 | library_path = &envline[16]; | |
1394 | break; | |
1395 | } | |
1396 | ||
14c44e2e UD |
1397 | /* Where to place the profiling data file. */ |
1398 | if (memcmp (&envline[3], "DEBUG_OUTPUT", 12) == 0) | |
1399 | { | |
1400 | debug_output = &envline[16]; | |
1401 | break; | |
1402 | } | |
ea278354 | 1403 | |
dec126b4 UD |
1404 | if (memcmp (&envline[3], "DYNAMIC_WEAK", 12) == 0) |
1405 | _dl_dynamic_weak = 1; | |
14c44e2e | 1406 | break; |
ea278354 | 1407 | |
14c44e2e UD |
1408 | case 14: |
1409 | /* Where to place the profiling data file. */ | |
3081378b UD |
1410 | if (!__libc_enable_secure |
1411 | && memcmp (&envline[3], "PROFILE_OUTPUT", 14) == 0) | |
14c44e2e UD |
1412 | { |
1413 | _dl_profile_output = &envline[18]; | |
1414 | if (*_dl_profile_output == '\0') | |
1415 | _dl_profile_output = "/var/tmp"; | |
1416 | } | |
1417 | break; | |
120b4c49 | 1418 | |
14c44e2e UD |
1419 | case 20: |
1420 | /* The mode of the dynamic linker can be set. */ | |
1421 | if (memcmp (&envline[3], "TRACE_LOADED_OBJECTS", 20) == 0) | |
1422 | mode = trace; | |
1423 | break; | |
e2102c14 UD |
1424 | |
1425 | /* We might have some extra environment variable to handle. This | |
1426 | is tricky due to the pre-processing of the length of the name | |
1427 | in the switch statement here. The code here assumes that added | |
1428 | environment variables have a different length. */ | |
1429 | #ifdef EXTRA_LD_ENVVARS | |
1430 | EXTRA_LD_ENVVARS | |
1431 | #endif | |
ea278354 UD |
1432 | } |
1433 | } | |
1434 | ||
4bae5567 UD |
1435 | /* Extra security for SUID binaries. Remove all dangerous environment |
1436 | variables. */ | |
1437 | if (__libc_enable_secure) | |
1438 | { | |
1439 | static const char *unsecure_envvars[] = | |
1440 | { | |
1441 | #ifdef EXTRA_UNSECURE_ENVVARS | |
1442 | EXTRA_UNSECURE_ENVVARS | |
1443 | #endif | |
1444 | }; | |
1445 | size_t cnt; | |
1446 | ||
1447 | if (preloadlist != NULL) | |
1448 | unsetenv ("LD_PRELOAD"); | |
1449 | if (library_path != NULL) | |
1450 | unsetenv ("LD_LIBRARY_PATH"); | |
722c33bb UD |
1451 | if (_dl_origin_path != NULL) |
1452 | unsetenv ("LD_ORIGIN_PATH"); | |
1453 | if (debug_output != NULL) | |
1454 | unsetenv ("LD_DEBUG_OUTPUT"); | |
1455 | if (_dl_profile != NULL) | |
1456 | unsetenv ("LD_PROFILE"); | |
4bae5567 UD |
1457 | |
1458 | for (cnt = 0; | |
1459 | cnt < sizeof (unsecure_envvars) / sizeof (unsecure_envvars[0]); | |
1460 | ++cnt) | |
1461 | unsetenv (unsecure_envvars[cnt]); | |
1462 | } | |
1463 | ||
722c33bb UD |
1464 | /* The name of the object to profile cannot be empty. */ |
1465 | if (_dl_profile != NULL && *_dl_profile == '\0') | |
1466 | _dl_profile = NULL; | |
1467 | ||
7dea968e UD |
1468 | /* If we have to run the dynamic linker in debugging mode and the |
1469 | LD_DEBUG_OUTPUT environment variable is given, we write the debug | |
1470 | messages to this file. */ | |
14c44e2e | 1471 | if (any_debug && debug_output != NULL && !__libc_enable_secure) |
7dea968e | 1472 | { |
7a2fd787 UD |
1473 | size_t name_len = strlen (debug_output); |
1474 | char buf[name_len + 12]; | |
1475 | char *startp; | |
1476 | ||
1477 | buf[name_len + 11] = '\0'; | |
1478 | startp = _itoa_word (__getpid (), &buf[name_len + 11], 10, 0); | |
1479 | *--startp = '.'; | |
1480 | startp = memcpy (startp - name_len, debug_output, name_len); | |
1481 | ||
1482 | _dl_debug_fd = __open (startp, O_WRONLY | O_APPEND | O_CREAT, 0666); | |
7dea968e UD |
1483 | if (_dl_debug_fd == -1) |
1484 | /* We use standard output if opening the file failed. */ | |
1485 | _dl_debug_fd = STDOUT_FILENO; | |
1486 | } | |
1487 | ||
ea278354 UD |
1488 | /* LAZY is determined by the environment variable LD_WARN and |
1489 | LD_BIND_NOW if we trace the binary. */ | |
9a821cf9 | 1490 | if (__builtin_expect (mode, normal) == trace) |
ea278354 UD |
1491 | *lazyp = _dl_verbose ? !bind_now : -1; |
1492 | else | |
57de5037 | 1493 | *lazyp = !bind_now; |
ea278354 UD |
1494 | |
1495 | *modep = mode; | |
1496 | } | |
db276fa1 UD |
1497 | |
1498 | ||
1499 | /* Print the various times we collected. */ | |
1500 | static void | |
1501 | print_statistics (void) | |
1502 | { | |
1503 | char buf[200]; | |
8b07d6a8 | 1504 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
1505 | char *cp; |
1506 | char *wp; | |
1507 | ||
1508 | /* Total time rtld used. */ | |
1509 | if (HP_TIMING_AVAIL) | |
1510 | { | |
1511 | HP_TIMING_PRINT (buf, sizeof (buf), rtld_total_time); | |
1512 | _dl_debug_message (1, "\nruntime linker statistics:\n" | |
1513 | " total startup time in dynamic loader: ", | |
1514 | buf, "\n", NULL); | |
1515 | } | |
1516 | ||
1517 | /* Print relocation statistics. */ | |
1518 | if (HP_TIMING_AVAIL) | |
1519 | { | |
1520 | HP_TIMING_PRINT (buf, sizeof (buf), relocate_time); | |
1521 | _dl_debug_message (1, " time needed for relocation: ", buf, | |
1522 | NULL); | |
1523 | cp = _itoa_word ((1000 * relocate_time) / rtld_total_time, | |
1524 | buf + sizeof (buf), 10, 0); | |
1525 | wp = buf; | |
1526 | switch (buf + sizeof (buf) - cp) | |
1527 | { | |
1528 | case 3: | |
1529 | *wp++ = *cp++; | |
1530 | case 2: | |
1531 | *wp++ = *cp++; | |
1532 | case 1: | |
1533 | *wp++ = '.'; | |
1534 | *wp++ = *cp++; | |
1535 | } | |
1536 | *wp = '\0'; | |
1537 | _dl_debug_message (0, " (", buf, "%)\n", NULL); | |
1538 | } | |
1531e094 | 1539 | #endif |
db276fa1 UD |
1540 | buf[sizeof (buf) - 1] = '\0'; |
1541 | _dl_debug_message (1, " number of relocations: ", | |
1542 | _itoa_word (_dl_num_relocations, | |
1543 | buf + sizeof (buf) - 1, 10, 0), | |
1544 | "\n", NULL); | |
1545 | ||
1531e094 | 1546 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
1547 | /* Time spend while loading the object and the dependencies. */ |
1548 | if (HP_TIMING_AVAIL) | |
1549 | { | |
1550 | HP_TIMING_PRINT (buf, sizeof (buf), load_time); | |
1551 | _dl_debug_message (1, " time needed to load objects: ", buf, | |
1552 | NULL); | |
1553 | cp = _itoa_word ((1000 * load_time) / rtld_total_time, | |
1554 | buf + sizeof (buf), 10, 0); | |
1555 | wp = buf; | |
1556 | switch (buf + sizeof (buf) - cp) | |
1557 | { | |
1558 | case 3: | |
1559 | *wp++ = *cp++; | |
1560 | case 2: | |
1561 | *wp++ = *cp++; | |
1562 | case 1: | |
1563 | *wp++ = '.'; | |
1564 | *wp++ = *cp++; | |
1565 | } | |
1566 | *wp = '\0'; | |
1567 | _dl_debug_message (0, " (", buf, "%)\n", NULL); | |
1568 | } | |
1531e094 | 1569 | #endif |
db276fa1 | 1570 | } |