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d66e34cd | 1 | /* Run time dynamic linker. |
e66d0a4c | 2 | Copyright (C) 1995-1999, 2000, 2001, 2002 Free Software Foundation, Inc. |
afd4eb37 | 3 | This file is part of the GNU C Library. |
d66e34cd | 4 | |
afd4eb37 | 5 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
d66e34cd | 14 | |
41bdb6e2 AJ |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
d66e34cd | 19 | |
7dea968e | 20 | #include <fcntl.h> |
164a7164 | 21 | #include <stdbool.h> |
d66e34cd | 22 | #include <stdlib.h> |
f51d1dfd | 23 | #include <string.h> |
d66e34cd | 24 | #include <unistd.h> |
2064087b | 25 | #include <sys/mman.h> /* Check if MAP_ANON is defined. */ |
af8bf6bd | 26 | #include <sys/param.h> |
ba9fcb3f | 27 | #include <sys/stat.h> |
a42195db | 28 | #include <ldsodefs.h> |
ce37fa88 | 29 | #include <stdio-common/_itoa.h> |
f21acc89 | 30 | #include <entry.h> |
c94a8080 | 31 | #include <fpu_control.h> |
db276fa1 | 32 | #include <hp-timing.h> |
cf197e41 | 33 | #include <bits/libc-lock.h> |
f5348425 | 34 | #include "dynamic-link.h" |
e2102c14 | 35 | #include "dl-librecon.h" |
74955460 | 36 | #include <unsecvars.h> |
5688da55 UD |
37 | #include <dl-cache.h> |
38 | #include <dl-procinfo.h> | |
f5348425 | 39 | |
a853022c | 40 | #include <assert.h> |
f5348425 | 41 | |
fd26970f | 42 | /* Helper function to handle errors while resolving symbols. */ |
c84142e8 UD |
43 | static void print_unresolved (int errcode, const char *objname, |
44 | const char *errsting); | |
45 | ||
46 | /* Helper function to handle errors when a version is missing. */ | |
47 | static void print_missing_version (int errcode, const char *objname, | |
48 | const char *errsting); | |
fd26970f | 49 | |
db276fa1 UD |
50 | /* Print the various times we collected. */ |
51 | static void print_statistics (void); | |
ea278354 UD |
52 | |
53 | /* This is a list of all the modes the dynamic loader can be in. */ | |
54 | enum mode { normal, list, verify, trace }; | |
55 | ||
56 | /* Process all environments variables the dynamic linker must recognize. | |
57 | Since all of them start with `LD_' we are a bit smarter while finding | |
58 | all the entries. */ | |
ba9fcb3f | 59 | static void process_envvars (enum mode *modep); |
ea278354 | 60 | |
d66e34cd RM |
61 | int _dl_argc; |
62 | char **_dl_argv; | |
ceb27555 | 63 | unsigned int _dl_skip_args; /* Nonzero if we were run directly. */ |
cf197e41 | 64 | |
39778c6c UD |
65 | /* Set nonzero during loading and initialization of executable and |
66 | libraries, cleared before the executable's entry point runs. This | |
67 | must not be initialized to nonzero, because the unused dynamic | |
68 | linker loaded in for libc.so's "ld.so.1" dep will provide the | |
69 | definition seen by libc.so's initializer; that value must be zero, | |
70 | and will be since that dynamic linker's _dl_start and dl_main will | |
71 | never be called. */ | |
72 | int _dl_starting_up; | |
73 | ||
d6b5d570 UD |
74 | /* This is the structure which defines all variables global to ld.so |
75 | (except those which cannot be added for some reason). */ | |
5688da55 UD |
76 | struct rtld_global _rtld_global = |
77 | { | |
ccdf0cab UD |
78 | /* Get architecture specific initializer. */ |
79 | #include <dl-procinfo.c> | |
5688da55 UD |
80 | ._dl_debug_fd = STDERR_FILENO, |
81 | #if 1 | |
82 | /* XXX I know about at least one case where we depend on the old | |
83 | weak behavior (it has to do with librt). Until we get DSO | |
84 | groups implemented we have to make this the default. | |
85 | Bummer. --drepper */ | |
86 | ._dl_dynamic_weak = 1, | |
87 | #endif | |
88 | ._dl_lazy = 1, | |
89 | ._dl_fpu_control = _FPU_DEFAULT, | |
90 | ._dl_correct_cache_id = _DL_CACHE_DEFAULT_ID, | |
91 | ._dl_hwcap_mask = HWCAP_IMPORTANT, | |
92 | ._dl_load_lock = _LIBC_LOCK_RECURSIVE_INITIALIZER | |
93 | }; | |
94 | /* There must only be the definition in ld.so itself. */ | |
95 | #ifdef HAVE_PROTECTED | |
96 | asm (".protected _rtld_global"); | |
97 | #endif | |
d6b5d570 | 98 | |
c0fb8a56 | 99 | |
67ddea92 | 100 | static void dl_main (const ElfW(Phdr) *phdr, ElfW(Word) phnum, |
266180eb | 101 | ElfW(Addr) *user_entry); |
d66e34cd | 102 | |
d6b5d570 UD |
103 | static struct libname_list _dl_rtld_libname; |
104 | static struct libname_list _dl_rtld_libname2; | |
86d2c878 | 105 | |
eaad82e0 UD |
106 | /* We expect less than a second for relocation. */ |
107 | #ifdef HP_SMALL_TIMING_AVAIL | |
108 | # undef HP_TIMING_AVAIL | |
109 | # define HP_TIMING_AVAIL HP_SMALL_TIMING_AVAIL | |
110 | #endif | |
111 | ||
db276fa1 | 112 | /* Variable for statistics. */ |
5732c4df | 113 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
114 | static hp_timing_t rtld_total_time; |
115 | static hp_timing_t relocate_time; | |
116 | static hp_timing_t load_time; | |
5732c4df | 117 | #endif |
db276fa1 | 118 | |
6a1db4ff UD |
119 | static ElfW(Addr) _dl_start_final (void *arg, struct link_map *bootstrap_map_p, |
120 | hp_timing_t start_time); | |
121 | ||
b1dbbaa4 RM |
122 | #ifdef RTLD_START |
123 | RTLD_START | |
124 | #else | |
eaad82e0 | 125 | # error "sysdeps/MACHINE/dl-machine.h fails to define RTLD_START" |
b1dbbaa4 RM |
126 | #endif |
127 | ||
50746436 | 128 | static ElfW(Addr) __attribute_used__ internal_function |
d66e34cd RM |
129 | _dl_start (void *arg) |
130 | { | |
86d2c878 | 131 | struct link_map bootstrap_map; |
db276fa1 | 132 | hp_timing_t start_time; |
1b4575ae | 133 | #if !__GNUC_PREREQ (2, 96) |
264ec183 | 134 | size_t cnt; |
1b4575ae | 135 | #endif |
d66e34cd | 136 | |
b1dbbaa4 RM |
137 | /* This #define produces dynamic linking inline functions for |
138 | bootstrap relocation instead of general-purpose relocation. */ | |
139 | #define RTLD_BOOTSTRAP | |
c0282c06 UD |
140 | #define RESOLVE_MAP(sym, version, flags) \ |
141 | ((*(sym))->st_shndx == SHN_UNDEF ? 0 : &bootstrap_map) | |
50463d27 UD |
142 | #define RESOLVE(sym, version, flags) \ |
143 | ((*(sym))->st_shndx == SHN_UNDEF ? 0 : bootstrap_map.l_addr) | |
b1dbbaa4 RM |
144 | #include "dynamic-link.h" |
145 | ||
db276fa1 UD |
146 | if (HP_TIMING_INLINE && HP_TIMING_AVAIL) |
147 | HP_TIMING_NOW (start_time); | |
148 | ||
e66d0a4c UD |
149 | /* Partly clean the `bootstrap_map' structure up. Don't use |
150 | `memset' since it might not be built in or inlined and we cannot | |
151 | make function calls at this point. Use '__builtin_memset' if we | |
152 | know it is available. */ | |
153 | #if __GNUC_PREREQ (2, 96) | |
154 | __builtin_memset (bootstrap_map.l_info, '\0', sizeof (bootstrap_map.l_info)); | |
155 | #else | |
264ec183 UD |
156 | for (cnt = 0; |
157 | cnt < sizeof (bootstrap_map.l_info) / sizeof (bootstrap_map.l_info[0]); | |
158 | ++cnt) | |
159 | bootstrap_map.l_info[cnt] = 0; | |
e66d0a4c | 160 | #endif |
264ec183 | 161 | |
d66e34cd | 162 | /* Figure out the run-time load address of the dynamic linker itself. */ |
86d2c878 | 163 | bootstrap_map.l_addr = elf_machine_load_address (); |
d66e34cd | 164 | |
47707456 UD |
165 | /* Read our own dynamic section and fill in the info array. */ |
166 | bootstrap_map.l_ld = (void *) bootstrap_map.l_addr + elf_machine_dynamic (); | |
d3ac2d47 | 167 | elf_get_dynamic_info (&bootstrap_map); |
d66e34cd RM |
168 | |
169 | #ifdef ELF_MACHINE_BEFORE_RTLD_RELOC | |
86d2c878 | 170 | ELF_MACHINE_BEFORE_RTLD_RELOC (bootstrap_map.l_info); |
d66e34cd RM |
171 | #endif |
172 | ||
32e6df36 UD |
173 | if (bootstrap_map.l_addr || ! bootstrap_map.l_info[VALIDX(DT_GNU_PRELINKED)]) |
174 | { | |
175 | /* Relocate ourselves so we can do normal function calls and | |
176 | data access using the global offset table. */ | |
177 | ||
178 | ELF_DYNAMIC_RELOCATE (&bootstrap_map, 0, 0); | |
179 | } | |
421f82e5 | 180 | |
ea7eb7e3 UD |
181 | /* Please note that we don't allow profiling of this object and |
182 | therefore need not test whether we have to allocate the array | |
183 | for the relocation results (as done in dl-reloc.c). */ | |
421f82e5 | 184 | |
d66e34cd RM |
185 | /* Now life is sane; we can call functions and access global data. |
186 | Set up to use the operating system facilities, and find out from | |
187 | the operating system's program loader where to find the program | |
6a1db4ff UD |
188 | header table in core. Put the rest of _dl_start into a separate |
189 | function, that way the compiler cannot put accesses to the GOT | |
190 | before ELF_DYNAMIC_RELOCATE. */ | |
c0282c06 UD |
191 | { |
192 | ElfW(Addr) entry = _dl_start_final (arg, &bootstrap_map, start_time); | |
193 | ||
194 | #ifndef ELF_MACHINE_START_ADDRESS | |
195 | # define ELF_MACHINE_START_ADDRESS(map, start) (start) | |
196 | #endif | |
197 | ||
d6b5d570 | 198 | return ELF_MACHINE_START_ADDRESS (GL(dl_loaded), entry); |
c0282c06 | 199 | } |
6a1db4ff UD |
200 | } |
201 | ||
202 | ||
32e6df36 UD |
203 | #ifndef VALIDX |
204 | # define VALIDX(tag) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM \ | |
205 | + DT_EXTRANUM + DT_VALTAGIDX (tag)) | |
206 | #endif | |
207 | #ifndef ADDRIDX | |
208 | # define ADDRIDX(tag) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM \ | |
209 | + DT_EXTRANUM + DT_VALNUM + DT_ADDRTAGIDX (tag)) | |
210 | #endif | |
211 | ||
6a1db4ff UD |
212 | static ElfW(Addr) |
213 | _dl_start_final (void *arg, struct link_map *bootstrap_map_p, | |
214 | hp_timing_t start_time) | |
215 | { | |
216 | /* The use of `alloca' here looks ridiculous but it helps. The goal | |
217 | is to avoid the function from being inlined. There is no official | |
218 | way to do this so we use this trick. gcc never inlines functions | |
219 | which use `alloca'. */ | |
220 | ElfW(Addr) *start_addr = alloca (sizeof (ElfW(Addr))); | |
32e6df36 | 221 | extern char _begin[], _end[]; |
535b764d UD |
222 | #ifdef USE_TLS |
223 | ElfW(Ehdr) *ehdr; | |
224 | ElfW(Phdr) *phdr; | |
225 | size_t cnt; | |
535b764d UD |
226 | dtv_t initdtv[2]; |
227 | #endif | |
d66e34cd | 228 | |
db276fa1 UD |
229 | if (HP_TIMING_AVAIL) |
230 | { | |
231 | /* If it hasn't happen yet record the startup time. */ | |
232 | if (! HP_TIMING_INLINE) | |
233 | HP_TIMING_NOW (start_time); | |
234 | ||
235 | /* Initialize the timing functions. */ | |
236 | HP_TIMING_DIFF_INIT (); | |
237 | } | |
238 | ||
86d2c878 | 239 | /* Transfer data about ourselves to the permanent link_map structure. */ |
d6b5d570 UD |
240 | GL(dl_rtld_map).l_addr = bootstrap_map_p->l_addr; |
241 | GL(dl_rtld_map).l_ld = bootstrap_map_p->l_ld; | |
242 | GL(dl_rtld_map).l_opencount = 1; | |
243 | memcpy (GL(dl_rtld_map).l_info, bootstrap_map_p->l_info, | |
244 | sizeof GL(dl_rtld_map).l_info); | |
245 | _dl_setup_hash (&GL(dl_rtld_map)); | |
246 | GL(dl_rtld_map).l_mach = bootstrap_map_p->l_mach; | |
247 | GL(dl_rtld_map).l_map_start = (ElfW(Addr)) _begin; | |
248 | GL(dl_rtld_map).l_map_end = (ElfW(Addr)) _end; | |
052b6a6c | 249 | |
67ddea92 UD |
250 | #if HP_TIMING_AVAIL |
251 | HP_TIMING_NOW (GL(dl_cpuclock_offset)); | |
252 | #endif | |
253 | ||
535b764d UD |
254 | #if USE_TLS |
255 | /* Get the dynamic linkers program header. */ | |
47536120 UD |
256 | ehdr = (ElfW(Ehdr) *) GL(dl_rtld_map).l_map_start; |
257 | phdr = (ElfW(Phdr) *) (GL(dl_rtld_map).l_map_start + ehdr->e_phoff); | |
535b764d UD |
258 | for (cnt = 0; cnt < ehdr->e_phnum; ++cnt) |
259 | if (phdr[cnt].p_type == PT_TLS) | |
260 | { | |
5d6feea8 | 261 | void *tlsblock; |
37d8b778 | 262 | size_t align = MAX (TLS_INIT_TCB_ALIGN, phdr[cnt].p_align); |
535b764d | 263 | |
5d6feea8 UD |
264 | GL(dl_rtld_map).l_tls_blocksize = phdr[cnt].p_memsz; |
265 | GL(dl_rtld_map).l_tls_initimage_size = phdr[cnt].p_filesz; | |
37d8b778 | 266 | GL(dl_rtld_map).l_tls_initimage = (void *) (GL(dl_rtld_map).l_map_start |
5d6feea8 | 267 | + phdr[cnt].p_offset); |
535b764d UD |
268 | |
269 | /* We can now allocate the initial TLS block. This can happen | |
270 | on the stack. We'll get the final memory later when we | |
271 | know all about the various objects loaded at startup | |
272 | time. */ | |
273 | # if TLS_TCB_AT_TP | |
5d6feea8 UD |
274 | tlsblock = alloca (roundup (GL(dl_rtld_map).l_tls_blocksize, |
275 | TLS_INIT_TCB_ALIGN) | |
535b764d UD |
276 | + TLS_INIT_TCB_SIZE |
277 | + align); | |
278 | # elif TLS_DTV_AT_TP | |
279 | tlsblock = alloca (roundup (TLS_INIT_TCB_SIZE, phdr[cnt].p_align) | |
5d6feea8 | 280 | + GL(dl_rtld_map).l_tls_blocksize |
535b764d UD |
281 | + align); |
282 | # else | |
283 | /* In case a model with a different layout for the TCB and DTV | |
284 | is defined add another #elif here and in the following #ifs. */ | |
285 | # error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined" | |
286 | # endif | |
287 | /* Align the TLS block. */ | |
288 | tlsblock = (void *) (((uintptr_t) tlsblock + align - 1) | |
289 | & ~(align - 1)); | |
290 | ||
291 | /* Initialize the dtv. */ | |
292 | initdtv[0].counter = 1; | |
293 | ||
294 | /* Initialize the TLS block. */ | |
295 | # if TLS_TCB_AT_TP | |
296 | initdtv[1].pointer = tlsblock; | |
297 | # elif TLS_DTV_AT_TP | |
5d6feea8 UD |
298 | GL(dl_rtld_map).l_tls_offset = roundup (TLS_INIT_TCB_SIZE, |
299 | phdr[cnt].p_align); | |
300 | initdtv[1].pointer = (char *) tlsblock + GL(dl_rtld_map).l_tls_offset); | |
535b764d UD |
301 | # else |
302 | # error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined" | |
303 | # endif | |
5d6feea8 UD |
304 | memset (__mempcpy (initdtv[1].pointer, GL(dl_rtld_map).l_tls_initimage, |
305 | GL(dl_rtld_map).l_tls_initimage_size), | |
306 | '\0', (GL(dl_rtld_map).l_tls_blocksize | |
307 | - GL(dl_rtld_map).l_tls_initimage_size)); | |
535b764d UD |
308 | |
309 | /* Initialize the thread pointer. */ | |
310 | # if TLS_TCB_AT_TP | |
5d6feea8 UD |
311 | GL(dl_rtld_map).l_tls_offset |
312 | = roundup (GL(dl_rtld_map).l_tls_blocksize, TLS_INIT_TCB_ALIGN); | |
313 | TLS_INIT_TP ((char *) tlsblock + GL(dl_rtld_map).l_tls_offset, | |
314 | initdtv); | |
535b764d | 315 | # elif TLS_DTV_AT_TP |
5d6feea8 | 316 | TLS_INIT_TP (tlsblock, initdtv); |
535b764d UD |
317 | # else |
318 | # error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined" | |
319 | # endif | |
320 | ||
5d6feea8 UD |
321 | /* So far this is module number one. */ |
322 | GL(dl_rtld_map).l_tls_modid = 1; | |
323 | ||
535b764d UD |
324 | /* There can only be one PT_TLS entry. */ |
325 | break; | |
326 | } | |
327 | #endif /* use TLS */ | |
328 | ||
d66e34cd RM |
329 | /* Call the OS-dependent function to set up life so we can do things like |
330 | file access. It will call `dl_main' (below) to do all the real work | |
331 | of the dynamic linker, and then unwind our frame and run the user | |
332 | entry point on the same stack we entered on. */ | |
6a1db4ff | 333 | *start_addr = _dl_sysdep_start (arg, &dl_main); |
535b764d | 334 | |
8b07d6a8 | 335 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
336 | if (HP_TIMING_AVAIL) |
337 | { | |
338 | hp_timing_t end_time; | |
339 | ||
340 | /* Get the current time. */ | |
341 | HP_TIMING_NOW (end_time); | |
342 | ||
343 | /* Compute the difference. */ | |
344 | HP_TIMING_DIFF (rtld_total_time, start_time, end_time); | |
345 | } | |
8b07d6a8 | 346 | #endif |
db276fa1 | 347 | |
d6b5d570 | 348 | if (__builtin_expect (GL(dl_debug_mask) & DL_DEBUG_STATISTICS, 0)) |
db276fa1 UD |
349 | print_statistics (); |
350 | ||
6a1db4ff | 351 | return *start_addr; |
d66e34cd RM |
352 | } |
353 | ||
d66e34cd RM |
354 | /* Now life is peachy; we can do all normal operations. |
355 | On to the real work. */ | |
356 | ||
993b3242 UD |
357 | /* Some helper functions. */ |
358 | ||
359 | /* Arguments to relocate_doit. */ | |
360 | struct relocate_args | |
361 | { | |
362 | struct link_map *l; | |
363 | int lazy; | |
364 | }; | |
365 | ||
366 | struct map_args | |
367 | { | |
368 | /* Argument to map_doit. */ | |
369 | char *str; | |
370 | /* Return value of map_doit. */ | |
371 | struct link_map *main_map; | |
372 | }; | |
373 | ||
374 | /* Arguments to version_check_doit. */ | |
375 | struct version_check_args | |
376 | { | |
993b3242 | 377 | int doexit; |
145b8413 | 378 | int dotrace; |
993b3242 UD |
379 | }; |
380 | ||
381 | static void | |
382 | relocate_doit (void *a) | |
383 | { | |
384 | struct relocate_args *args = (struct relocate_args *) a; | |
385 | ||
cff26a3e | 386 | INTUSE(_dl_relocate_object) (args->l, args->l->l_scope, args->lazy, 0); |
993b3242 UD |
387 | } |
388 | ||
389 | static void | |
390 | map_doit (void *a) | |
391 | { | |
be935610 | 392 | struct map_args *args = (struct map_args *) a; |
cff26a3e | 393 | args->main_map = INTUSE(_dl_map_object) (NULL, args->str, 0, lt_library, 0, 0); |
993b3242 UD |
394 | } |
395 | ||
396 | static void | |
397 | version_check_doit (void *a) | |
398 | { | |
be935610 | 399 | struct version_check_args *args = (struct version_check_args *) a; |
d6b5d570 | 400 | if (_dl_check_all_versions (GL(dl_loaded), 1, args->dotrace) && args->doexit) |
993b3242 UD |
401 | /* We cannot start the application. Abort now. */ |
402 | _exit (1); | |
403 | } | |
404 | ||
ce37fa88 UD |
405 | |
406 | static inline struct link_map * | |
407 | find_needed (const char *name) | |
408 | { | |
d6b5d570 | 409 | unsigned int n = GL(dl_loaded)->l_searchlist.r_nlist; |
ce37fa88 | 410 | |
be935610 | 411 | while (n-- > 0) |
d6b5d570 UD |
412 | if (_dl_name_match_p (name, GL(dl_loaded)->l_searchlist.r_list[n])) |
413 | return GL(dl_loaded)->l_searchlist.r_list[n]; | |
ce37fa88 UD |
414 | |
415 | /* Should never happen. */ | |
416 | return NULL; | |
417 | } | |
418 | ||
419 | static int | |
420 | match_version (const char *string, struct link_map *map) | |
421 | { | |
a42195db | 422 | const char *strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
ce37fa88 UD |
423 | ElfW(Verdef) *def; |
424 | ||
b0982c4a | 425 | #define VERDEFTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERDEF)) |
ce37fa88 UD |
426 | if (map->l_info[VERDEFTAG] == NULL) |
427 | /* The file has no symbol versioning. */ | |
428 | return 0; | |
429 | ||
430 | def = (ElfW(Verdef) *) ((char *) map->l_addr | |
431 | + map->l_info[VERDEFTAG]->d_un.d_ptr); | |
432 | while (1) | |
433 | { | |
434 | ElfW(Verdaux) *aux = (ElfW(Verdaux) *) ((char *) def + def->vd_aux); | |
435 | ||
436 | /* Compare the version strings. */ | |
437 | if (strcmp (string, strtab + aux->vda_name) == 0) | |
438 | /* Bingo! */ | |
439 | return 1; | |
440 | ||
441 | /* If no more definitions we failed to find what we want. */ | |
442 | if (def->vd_next == 0) | |
443 | break; | |
444 | ||
445 | /* Next definition. */ | |
446 | def = (ElfW(Verdef) *) ((char *) def + def->vd_next); | |
447 | } | |
448 | ||
449 | return 0; | |
450 | } | |
451 | ||
120b4c49 UD |
452 | static const char *library_path; /* The library search path. */ |
453 | static const char *preloadlist; /* The list preloaded objects. */ | |
454 | static int version_info; /* Nonzero if information about | |
455 | versions has to be printed. */ | |
a1a9d215 | 456 | |
d66e34cd | 457 | static void |
266180eb | 458 | dl_main (const ElfW(Phdr) *phdr, |
72f70279 | 459 | ElfW(Word) phnum, |
266180eb | 460 | ElfW(Addr) *user_entry) |
d66e34cd | 461 | { |
266180eb | 462 | const ElfW(Phdr) *ph; |
ea278354 | 463 | enum mode mode; |
2064087b RM |
464 | struct link_map **preloads; |
465 | unsigned int npreloads; | |
14bab8de UD |
466 | size_t file_size; |
467 | char *file; | |
164a7164 | 468 | bool has_interp = false; |
77aba05b | 469 | unsigned int i; |
164a7164 UD |
470 | bool prelinked = false; |
471 | bool rtld_is_main = false; | |
5732c4df | 472 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
473 | hp_timing_t start; |
474 | hp_timing_t stop; | |
475 | hp_timing_t diff; | |
5732c4df | 476 | #endif |
d66e34cd | 477 | |
ea278354 | 478 | /* Process the environment variable which control the behaviour. */ |
ba9fcb3f | 479 | process_envvars (&mode); |
3996f34b | 480 | |
46ec036d UD |
481 | /* Set up a flag which tells we are just starting. */ |
482 | _dl_starting_up = 1; | |
483 | ||
a16956f3 | 484 | if (*user_entry == (ElfW(Addr)) ENTRY_POINT) |
0200214b RM |
485 | { |
486 | /* Ho ho. We are not the program interpreter! We are the program | |
487 | itself! This means someone ran ld.so as a command. Well, that | |
488 | might be convenient to do sometimes. We support it by | |
489 | interpreting the args like this: | |
490 | ||
491 | ld.so PROGRAM ARGS... | |
492 | ||
493 | The first argument is the name of a file containing an ELF | |
494 | executable we will load and run with the following arguments. | |
495 | To simplify life here, PROGRAM is searched for using the | |
496 | normal rules for shared objects, rather than $PATH or anything | |
497 | like that. We just load it and use its entry point; we don't | |
498 | pay attention to its PT_INTERP command (we are the interpreter | |
499 | ourselves). This is an easy way to test a new ld.so before | |
500 | installing it. */ | |
164a7164 | 501 | rtld_is_main = true; |
421f82e5 | 502 | |
ffee1316 | 503 | /* Note the place where the dynamic linker actually came from. */ |
d6b5d570 | 504 | GL(dl_rtld_map).l_name = _dl_argv[0]; |
6a76c115 | 505 | |
fd26970f UD |
506 | while (_dl_argc > 1) |
507 | if (! strcmp (_dl_argv[1], "--list")) | |
508 | { | |
509 | mode = list; | |
5688da55 | 510 | GL(dl_lazy) = -1; /* This means do no dependency analysis. */ |
61965e9b | 511 | |
fd26970f UD |
512 | ++_dl_skip_args; |
513 | --_dl_argc; | |
514 | ++_dl_argv; | |
515 | } | |
516 | else if (! strcmp (_dl_argv[1], "--verify")) | |
517 | { | |
518 | mode = verify; | |
6a76c115 | 519 | |
fd26970f UD |
520 | ++_dl_skip_args; |
521 | --_dl_argc; | |
522 | ++_dl_argv; | |
523 | } | |
310930c1 | 524 | else if (! strcmp (_dl_argv[1], "--library-path") && _dl_argc > 2) |
880f421f UD |
525 | { |
526 | library_path = _dl_argv[2]; | |
527 | ||
310930c1 UD |
528 | _dl_skip_args += 2; |
529 | _dl_argc -= 2; | |
530 | _dl_argv += 2; | |
531 | } | |
b0a01055 | 532 | else if (! strcmp (_dl_argv[1], "--inhibit-rpath") && _dl_argc > 2) |
310930c1 | 533 | { |
d6b5d570 | 534 | GL(dl_inhibit_rpath) = _dl_argv[2]; |
310930c1 | 535 | |
880f421f UD |
536 | _dl_skip_args += 2; |
537 | _dl_argc -= 2; | |
538 | _dl_argv += 2; | |
539 | } | |
fd26970f UD |
540 | else |
541 | break; | |
d66e34cd | 542 | |
61eb22d3 UD |
543 | /* If we have no further argument the program was called incorrectly. |
544 | Grant the user some education. */ | |
545 | if (_dl_argc < 2) | |
35fc382a | 546 | _dl_fatal_printf ("\ |
2bcf29ba | 547 | Usage: ld.so [OPTION]... EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]\n\ |
61eb22d3 UD |
548 | You have invoked `ld.so', the helper program for shared library executables.\n\ |
549 | This program usually lives in the file `/lib/ld.so', and special directives\n\ | |
550 | in executable files using ELF shared libraries tell the system's program\n\ | |
551 | loader to load the helper program from this file. This helper program loads\n\ | |
552 | the shared libraries needed by the program executable, prepares the program\n\ | |
553 | to run, and runs it. You may invoke this helper program directly from the\n\ | |
554 | command line to load and run an ELF executable file; this is like executing\n\ | |
555 | that file itself, but always uses this helper program from the file you\n\ | |
556 | specified, instead of the helper program file specified in the executable\n\ | |
557 | file you run. This is mostly of use for maintainers to test new versions\n\ | |
2bcf29ba UD |
558 | of this helper program; chances are you did not intend to run this program.\n\ |
559 | \n\ | |
b0a01055 UD |
560 | --list list all dependencies and how they are resolved\n\ |
561 | --verify verify that given object really is a dynamically linked\n\ | |
e8b1163e | 562 | object we can handle\n\ |
b0a01055 UD |
563 | --library-path PATH use given PATH instead of content of the environment\n\ |
564 | variable LD_LIBRARY_PATH\n\ | |
fcf70d41 | 565 | --inhibit-rpath LIST ignore RUNPATH and RPATH information in object names\n\ |
35fc382a | 566 | in LIST\n"); |
61eb22d3 | 567 | |
0200214b RM |
568 | ++_dl_skip_args; |
569 | --_dl_argc; | |
570 | ++_dl_argv; | |
91f62ce6 | 571 | |
da832465 UD |
572 | /* Initialize the data structures for the search paths for shared |
573 | objects. */ | |
574 | _dl_init_paths (library_path); | |
575 | ||
9a821cf9 | 576 | if (__builtin_expect (mode, normal) == verify) |
2de99474 | 577 | { |
8e17ea58 UD |
578 | const char *objname; |
579 | const char *err_str = NULL; | |
993b3242 | 580 | struct map_args args; |
2de99474 | 581 | |
993b3242 | 582 | args.str = _dl_argv[0]; |
cff26a3e | 583 | (void) INTUSE(_dl_catch_error) (&objname, &err_str, map_doit, &args); |
8e17ea58 | 584 | if (__builtin_expect (err_str != NULL, 0)) |
dcf0671d | 585 | { |
ca3c0135 UD |
586 | if (err_str != _dl_out_of_memory) |
587 | free ((char *) err_str); | |
dcf0671d UD |
588 | _exit (EXIT_FAILURE); |
589 | } | |
2de99474 UD |
590 | } |
591 | else | |
db276fa1 UD |
592 | { |
593 | HP_TIMING_NOW (start); | |
cff26a3e | 594 | INTUSE(_dl_map_object) (NULL, _dl_argv[0], 0, lt_library, 0, 0); |
db276fa1 | 595 | HP_TIMING_NOW (stop); |
61e0617a | 596 | |
db276fa1 UD |
597 | HP_TIMING_DIFF (load_time, start, stop); |
598 | } | |
2de99474 | 599 | |
d6b5d570 UD |
600 | phdr = GL(dl_loaded)->l_phdr; |
601 | phnum = GL(dl_loaded)->l_phnum; | |
143e2b96 UD |
602 | /* We overwrite here a pointer to a malloc()ed string. But since |
603 | the malloc() implementation used at this point is the dummy | |
604 | implementations which has no real free() function it does not | |
605 | makes sense to free the old string first. */ | |
d6b5d570 UD |
606 | GL(dl_loaded)->l_name = (char *) ""; |
607 | *user_entry = GL(dl_loaded)->l_entry; | |
0200214b RM |
608 | } |
609 | else | |
610 | { | |
611 | /* Create a link_map for the executable itself. | |
612 | This will be what dlopen on "" returns. */ | |
87c812c2 | 613 | _dl_new_object ((char *) "", "", lt_executable, NULL); |
d6b5d570 | 614 | if (GL(dl_loaded) == NULL) |
35fc382a | 615 | _dl_fatal_printf ("cannot allocate memory for link map\n"); |
d6b5d570 UD |
616 | GL(dl_loaded)->l_phdr = phdr; |
617 | GL(dl_loaded)->l_phnum = phnum; | |
618 | GL(dl_loaded)->l_entry = *user_entry; | |
da832465 | 619 | |
61e0617a UD |
620 | /* At this point we are in a bit of trouble. We would have to |
621 | fill in the values for l_dev and l_ino. But in general we | |
622 | do not know where the file is. We also do not handle AT_EXECFD | |
623 | even if it would be passed up. | |
624 | ||
625 | We leave the values here defined to 0. This is normally no | |
626 | problem as the program code itself is normally no shared | |
627 | object and therefore cannot be loaded dynamically. Nothing | |
628 | prevent the use of dynamic binaries and in these situations | |
629 | we might get problems. We might not be able to find out | |
630 | whether the object is already loaded. But since there is no | |
631 | easy way out and because the dynamic binary must also not | |
632 | have an SONAME we ignore this program for now. If it becomes | |
633 | a problem we can force people using SONAMEs. */ | |
634 | ||
97a51d8a UD |
635 | /* We delay initializing the path structure until we got the dynamic |
636 | information for the program. */ | |
0200214b RM |
637 | } |
638 | ||
d6b5d570 | 639 | GL(dl_loaded)->l_map_end = 0; |
052b6a6c | 640 | /* Perhaps the executable has no PT_LOAD header entries at all. */ |
d6b5d570 | 641 | GL(dl_loaded)->l_map_start = ~0; |
e7beef5f | 642 | /* We opened the file, account for it. */ |
d6b5d570 | 643 | ++GL(dl_loaded)->l_opencount; |
052b6a6c | 644 | |
0200214b | 645 | /* Scan the program header table for the dynamic section. */ |
72f70279 | 646 | for (ph = phdr; ph < &phdr[phnum]; ++ph) |
0200214b RM |
647 | switch (ph->p_type) |
648 | { | |
da832465 UD |
649 | case PT_PHDR: |
650 | /* Find out the load address. */ | |
d6b5d570 | 651 | GL(dl_loaded)->l_addr = (ElfW(Addr)) phdr - ph->p_vaddr; |
da832465 | 652 | break; |
0200214b RM |
653 | case PT_DYNAMIC: |
654 | /* This tells us where to find the dynamic section, | |
655 | which tells us everything we need to do. */ | |
d6b5d570 | 656 | GL(dl_loaded)->l_ld = (void *) GL(dl_loaded)->l_addr + ph->p_vaddr; |
0200214b RM |
657 | break; |
658 | case PT_INTERP: | |
659 | /* This "interpreter segment" was used by the program loader to | |
660 | find the program interpreter, which is this program itself, the | |
661 | dynamic linker. We note what name finds us, so that a future | |
662 | dlopen call or DT_NEEDED entry, for something that wants to link | |
663 | against the dynamic linker as a shared library, will know that | |
664 | the shared object is already loaded. */ | |
d6b5d570 | 665 | _dl_rtld_libname.name = ((const char *) GL(dl_loaded)->l_addr |
be935610 | 666 | + ph->p_vaddr); |
752a2a50 | 667 | /* _dl_rtld_libname.next = NULL; Already zero. */ |
d6b5d570 | 668 | GL(dl_rtld_map).l_libname = &_dl_rtld_libname; |
f41c8091 UD |
669 | |
670 | /* Ordinarilly, we would get additional names for the loader from | |
671 | our DT_SONAME. This can't happen if we were actually linked as | |
672 | a static executable (detect this case when we have no DYNAMIC). | |
673 | If so, assume the filename component of the interpreter path to | |
674 | be our SONAME, and add it to our name list. */ | |
d6b5d570 | 675 | if (GL(dl_rtld_map).l_ld == NULL) |
f41c8091 | 676 | { |
88794e30 UD |
677 | const char *p = NULL; |
678 | const char *cp = _dl_rtld_libname.name; | |
679 | ||
680 | /* Find the filename part of the path. */ | |
681 | while (*cp != '\0') | |
682 | if (*cp++ == '/') | |
683 | p = cp; | |
684 | ||
685 | if (p != NULL) | |
f41c8091 | 686 | { |
88794e30 | 687 | _dl_rtld_libname2.name = p; |
752a2a50 | 688 | /* _dl_rtld_libname2.next = NULL; Already zero. */ |
f41c8091 UD |
689 | _dl_rtld_libname.next = &_dl_rtld_libname2; |
690 | } | |
691 | } | |
692 | ||
164a7164 | 693 | has_interp = true; |
0200214b | 694 | break; |
052b6a6c | 695 | case PT_LOAD: |
052b6a6c UD |
696 | { |
697 | ElfW(Addr) mapstart; | |
2373b30e UD |
698 | ElfW(Addr) allocend; |
699 | ||
700 | /* Remember where the main program starts in memory. */ | |
d6b5d570 UD |
701 | mapstart = (GL(dl_loaded)->l_addr |
702 | + (ph->p_vaddr & ~(ph->p_align - 1))); | |
703 | if (GL(dl_loaded)->l_map_start > mapstart) | |
704 | GL(dl_loaded)->l_map_start = mapstart; | |
2373b30e UD |
705 | |
706 | /* Also where it ends. */ | |
d6b5d570 UD |
707 | allocend = GL(dl_loaded)->l_addr + ph->p_vaddr + ph->p_memsz; |
708 | if (GL(dl_loaded)->l_map_end < allocend) | |
709 | GL(dl_loaded)->l_map_end = allocend; | |
052b6a6c UD |
710 | } |
711 | break; | |
a2f1f5cb UD |
712 | #ifdef USE_TLS |
713 | case PT_TLS: | |
714 | /* Note that in the case the dynamic linker we duplicate work | |
715 | here since we read the PT_TLS entry already in | |
716 | _dl_start_final. But the result is repeatable so do not | |
717 | check for this special but unimportant case. */ | |
718 | GL(dl_loaded)->l_tls_blocksize = ph->p_memsz; | |
719 | GL(dl_loaded)->l_tls_initimage_size = ph->p_filesz; | |
720 | GL(dl_loaded)->l_tls_initimage = (void *) (GL(dl_loaded)->l_addr | |
721 | + ph->p_offset); | |
722 | /* This is the first element of the initialization image list. | |
723 | It is created as a circular list so that we can easily | |
724 | append to it. */ | |
725 | GL(dl_initimage_list) = GL(dl_loaded)->l_tls_nextimage = GL(dl_loaded); | |
726 | ||
727 | /* This image get the ID one. */ | |
728 | GL(dl_tls_module_cnt) = GL(dl_loaded)->l_tls_modid = 1; | |
729 | break; | |
730 | #endif | |
0200214b | 731 | } |
d6b5d570 UD |
732 | if (! GL(dl_loaded)->l_map_end) |
733 | GL(dl_loaded)->l_map_end = ~0; | |
734 | if (! GL(dl_rtld_map).l_libname && GL(dl_rtld_map).l_name) | |
c84142e8 UD |
735 | { |
736 | /* We were invoked directly, so the program might not have a | |
737 | PT_INTERP. */ | |
d6b5d570 | 738 | _dl_rtld_libname.name = GL(dl_rtld_map).l_name; |
752a2a50 | 739 | /* _dl_rtld_libname.next = NULL; Alread zero. */ |
d6b5d570 | 740 | GL(dl_rtld_map).l_libname = &_dl_rtld_libname; |
c84142e8 | 741 | } |
ffee1316 | 742 | else |
d6b5d570 | 743 | assert (GL(dl_rtld_map).l_libname); /* How else did we get here? */ |
0200214b | 744 | |
9a51759b UD |
745 | if (! rtld_is_main) |
746 | { | |
747 | /* Extract the contents of the dynamic section for easy access. */ | |
d6b5d570 UD |
748 | elf_get_dynamic_info (GL(dl_loaded)); |
749 | if (GL(dl_loaded)->l_info[DT_HASH]) | |
9a51759b | 750 | /* Set up our cache of pointers into the hash table. */ |
d6b5d570 | 751 | _dl_setup_hash (GL(dl_loaded)); |
9a51759b | 752 | } |
0200214b | 753 | |
9a821cf9 | 754 | if (__builtin_expect (mode, normal) == verify) |
e2102c14 UD |
755 | { |
756 | /* We were called just to verify that this is a dynamic | |
757 | executable using us as the program interpreter. Exit with an | |
758 | error if we were not able to load the binary or no interpreter | |
759 | is specified (i.e., this is no dynamically linked binary. */ | |
d6b5d570 | 760 | if (GL(dl_loaded)->l_ld == NULL) |
e2102c14 | 761 | _exit (1); |
e2102c14 UD |
762 | |
763 | /* We allow here some platform specific code. */ | |
764 | #ifdef DISTINGUISH_LIB_VERSIONS | |
765 | DISTINGUISH_LIB_VERSIONS; | |
766 | #endif | |
eb406346 | 767 | _exit (has_interp ? 0 : 2); |
e2102c14 UD |
768 | } |
769 | ||
9a51759b | 770 | if (! rtld_is_main) |
97a51d8a UD |
771 | /* Initialize the data structures for the search paths for shared |
772 | objects. */ | |
120b4c49 | 773 | _dl_init_paths (library_path); |
97a51d8a | 774 | |
0200214b | 775 | /* Put the link_map for ourselves on the chain so it can be found by |
ceb2d9aa | 776 | name. Note that at this point the global chain of link maps contains |
d6b5d570 UD |
777 | exactly one element, which is pointed to by dl_loaded. */ |
778 | if (! GL(dl_rtld_map).l_name) | |
ffee1316 RM |
779 | /* If not invoked directly, the dynamic linker shared object file was |
780 | found by the PT_INTERP name. */ | |
d6b5d570 UD |
781 | GL(dl_rtld_map).l_name = (char *) GL(dl_rtld_map).l_libname->name; |
782 | GL(dl_rtld_map).l_type = lt_library; | |
783 | GL(dl_loaded)->l_next = &GL(dl_rtld_map); | |
784 | GL(dl_rtld_map).l_prev = GL(dl_loaded); | |
785 | ++GL(dl_nloaded); | |
0200214b | 786 | |
14bab8de | 787 | /* We have two ways to specify objects to preload: via environment |
49c091e5 | 788 | variable and via the file /etc/ld.so.preload. The latter can also |
14bab8de | 789 | be used when security is enabled. */ |
2064087b RM |
790 | preloads = NULL; |
791 | npreloads = 0; | |
14bab8de | 792 | |
db33f7d4 | 793 | if (__builtin_expect (preloadlist != NULL, 0)) |
c4029823 | 794 | { |
566efee2 UD |
795 | /* The LD_PRELOAD environment variable gives list of libraries |
796 | separated by white space or colons that are loaded before the | |
fd26970f UD |
797 | executable's dependencies and prepended to the global scope |
798 | list. If the binary is running setuid all elements | |
799 | containing a '/' are ignored since it is insecure. */ | |
800 | char *list = strdupa (preloadlist); | |
801 | char *p; | |
db276fa1 UD |
802 | |
803 | HP_TIMING_NOW (start); | |
804 | ||
9710f75d UD |
805 | /* Prevent optimizing strsep. Speed is not important here. */ |
806 | while ((p = (strsep) (&list, " :")) != NULL) | |
e2102c14 | 807 | if (p[0] != '\0' |
db33f7d4 UD |
808 | && (__builtin_expect (! __libc_enable_secure, 1) |
809 | || strchr (p, '/') == NULL)) | |
fd26970f | 810 | { |
cff26a3e AJ |
811 | struct link_map *new_map = INTUSE(_dl_map_object) (GL(dl_loaded), p, |
812 | 1, lt_library, | |
813 | 0, 0); | |
42c4f32a | 814 | if (++new_map->l_opencount == 1) |
bd355af0 UD |
815 | /* It is no duplicate. */ |
816 | ++npreloads; | |
fd26970f | 817 | } |
db276fa1 UD |
818 | |
819 | HP_TIMING_NOW (stop); | |
820 | HP_TIMING_DIFF (diff, start, stop); | |
821 | HP_TIMING_ACCUM_NT (load_time, diff); | |
c4029823 UD |
822 | } |
823 | ||
14bab8de UD |
824 | /* Read the contents of the file. */ |
825 | file = _dl_sysdep_read_whole_file ("/etc/ld.so.preload", &file_size, | |
826 | PROT_READ | PROT_WRITE); | |
40b07f5b | 827 | if (__builtin_expect (file != MAP_FAILED, 0)) |
14bab8de UD |
828 | { |
829 | /* Parse the file. It contains names of libraries to be loaded, | |
830 | separated by white spaces or `:'. It may also contain | |
831 | comments introduced by `#'. */ | |
832 | char *problem; | |
833 | char *runp; | |
834 | size_t rest; | |
835 | ||
836 | /* Eliminate comments. */ | |
837 | runp = file; | |
838 | rest = file_size; | |
839 | while (rest > 0) | |
840 | { | |
841 | char *comment = memchr (runp, '#', rest); | |
842 | if (comment == NULL) | |
843 | break; | |
844 | ||
845 | rest -= comment - runp; | |
846 | do | |
847 | *comment = ' '; | |
848 | while (--rest > 0 && *++comment != '\n'); | |
849 | } | |
850 | ||
851 | /* We have one problematic case: if we have a name at the end of | |
852 | the file without a trailing terminating characters, we cannot | |
853 | place the \0. Handle the case separately. */ | |
49891c10 UD |
854 | if (file[file_size - 1] != ' ' && file[file_size - 1] != '\t' |
855 | && file[file_size - 1] != '\n' && file[file_size - 1] != ':') | |
14bab8de UD |
856 | { |
857 | problem = &file[file_size]; | |
858 | while (problem > file && problem[-1] != ' ' && problem[-1] != '\t' | |
49891c10 | 859 | && problem[-1] != '\n' && problem[-1] != ':') |
14bab8de UD |
860 | --problem; |
861 | ||
862 | if (problem > file) | |
863 | problem[-1] = '\0'; | |
864 | } | |
865 | else | |
49891c10 UD |
866 | { |
867 | problem = NULL; | |
868 | file[file_size - 1] = '\0'; | |
869 | } | |
14bab8de | 870 | |
db276fa1 UD |
871 | HP_TIMING_NOW (start); |
872 | ||
14bab8de UD |
873 | if (file != problem) |
874 | { | |
875 | char *p; | |
e2102c14 | 876 | runp = file; |
14bab8de | 877 | while ((p = strsep (&runp, ": \t\n")) != NULL) |
e2102c14 UD |
878 | if (p[0] != '\0') |
879 | { | |
cff26a3e AJ |
880 | struct link_map *new_map = INTUSE(_dl_map_object) (GL(dl_loaded), |
881 | p, 1, | |
882 | lt_library, | |
883 | 0, 0); | |
42c4f32a | 884 | if (++new_map->l_opencount == 1) |
e2102c14 UD |
885 | /* It is no duplicate. */ |
886 | ++npreloads; | |
887 | } | |
14bab8de UD |
888 | } |
889 | ||
890 | if (problem != NULL) | |
891 | { | |
892 | char *p = strndupa (problem, file_size - (problem - file)); | |
cff26a3e AJ |
893 | struct link_map *new_map = INTUSE(_dl_map_object) (GL(dl_loaded), p, 1, |
894 | lt_library, 0, 0); | |
42c4f32a | 895 | if (++new_map->l_opencount == 1) |
bd355af0 UD |
896 | /* It is no duplicate. */ |
897 | ++npreloads; | |
14bab8de UD |
898 | } |
899 | ||
db276fa1 UD |
900 | HP_TIMING_NOW (stop); |
901 | HP_TIMING_DIFF (diff, start, stop); | |
902 | HP_TIMING_ACCUM_NT (load_time, diff); | |
903 | ||
14bab8de UD |
904 | /* We don't need the file anymore. */ |
905 | __munmap (file, file_size); | |
906 | } | |
907 | ||
db33f7d4 | 908 | if (__builtin_expect (npreloads, 0) != 0) |
14bab8de UD |
909 | { |
910 | /* Set up PRELOADS with a vector of the preloaded libraries. */ | |
911 | struct link_map *l; | |
14bab8de | 912 | preloads = __alloca (npreloads * sizeof preloads[0]); |
d6b5d570 | 913 | l = GL(dl_rtld_map).l_next; /* End of the chain before preloads. */ |
14bab8de UD |
914 | i = 0; |
915 | do | |
916 | { | |
917 | preloads[i++] = l; | |
918 | l = l->l_next; | |
919 | } while (l); | |
920 | assert (i == npreloads); | |
921 | } | |
922 | ||
2064087b RM |
923 | /* Load all the libraries specified by DT_NEEDED entries. If LD_PRELOAD |
924 | specified some libraries to load, these are inserted before the actual | |
925 | dependencies in the executable's searchlist for symbol resolution. */ | |
db276fa1 | 926 | HP_TIMING_NOW (start); |
cff26a3e | 927 | INTUSE(_dl_map_object_deps) (GL(dl_loaded), preloads, npreloads, mode == trace); |
db276fa1 UD |
928 | HP_TIMING_NOW (stop); |
929 | HP_TIMING_DIFF (diff, start, stop); | |
930 | HP_TIMING_ACCUM_NT (load_time, diff); | |
e3e35cfc | 931 | |
42c4f32a UD |
932 | /* Mark all objects as being in the global scope and set the open |
933 | counter. */ | |
d6b5d570 | 934 | for (i = GL(dl_loaded)->l_searchlist.r_nlist; i > 0; ) |
42c4f32a UD |
935 | { |
936 | --i; | |
d6b5d570 UD |
937 | GL(dl_loaded)->l_searchlist.r_list[i]->l_global = 1; |
938 | ++GL(dl_loaded)->l_searchlist.r_list[i]->l_opencount; | |
42c4f32a | 939 | } |
d66e34cd | 940 | |
2064087b | 941 | #ifndef MAP_ANON |
f332db02 RM |
942 | /* We are done mapping things, so close the zero-fill descriptor. */ |
943 | __close (_dl_zerofd); | |
944 | _dl_zerofd = -1; | |
2064087b | 945 | #endif |
f332db02 | 946 | |
f9496a7b | 947 | /* Remove _dl_rtld_map from the chain. */ |
d6b5d570 UD |
948 | GL(dl_rtld_map).l_prev->l_next = GL(dl_rtld_map).l_next; |
949 | if (GL(dl_rtld_map).l_next) | |
950 | GL(dl_rtld_map).l_next->l_prev = GL(dl_rtld_map).l_prev; | |
f9496a7b | 951 | |
d6b5d570 | 952 | if (__builtin_expect (GL(dl_rtld_map).l_opencount > 1, 1)) |
0200214b | 953 | { |
f9496a7b RM |
954 | /* Some DT_NEEDED entry referred to the interpreter object itself, so |
955 | put it back in the list of visible objects. We insert it into the | |
956 | chain in symbol search order because gdb uses the chain's order as | |
957 | its symbol search order. */ | |
77aba05b | 958 | i = 1; |
d6b5d570 | 959 | while (GL(dl_loaded)->l_searchlist.r_list[i] != &GL(dl_rtld_map)) |
f9496a7b | 960 | ++i; |
d6b5d570 | 961 | GL(dl_rtld_map).l_prev = GL(dl_loaded)->l_searchlist.r_list[i - 1]; |
b2bcd61a | 962 | if (__builtin_expect (mode, normal) == normal) |
d6b5d570 UD |
963 | GL(dl_rtld_map).l_next = (i + 1 < GL(dl_loaded)->l_searchlist.r_nlist |
964 | ? GL(dl_loaded)->l_searchlist.r_list[i + 1] | |
965 | : NULL); | |
b2bcd61a UD |
966 | else |
967 | /* In trace mode there might be an invisible object (which we | |
968 | could not find) after the previous one in the search list. | |
969 | In this case it doesn't matter much where we put the | |
970 | interpreter object, so we just initialize the list pointer so | |
971 | that the assertion below holds. */ | |
d6b5d570 | 972 | GL(dl_rtld_map).l_next = GL(dl_rtld_map).l_prev->l_next; |
b2bcd61a | 973 | |
d6b5d570 UD |
974 | assert (GL(dl_rtld_map).l_prev->l_next == GL(dl_rtld_map).l_next); |
975 | GL(dl_rtld_map).l_prev->l_next = &GL(dl_rtld_map); | |
976 | if (GL(dl_rtld_map).l_next) | |
f9496a7b | 977 | { |
d6b5d570 UD |
978 | assert (GL(dl_rtld_map).l_next->l_prev == GL(dl_rtld_map).l_prev); |
979 | GL(dl_rtld_map).l_next->l_prev = &GL(dl_rtld_map); | |
f9496a7b | 980 | } |
0200214b | 981 | } |
d66e34cd | 982 | |
c84142e8 UD |
983 | /* Now let us see whether all libraries are available in the |
984 | versions we need. */ | |
985 | { | |
993b3242 UD |
986 | struct version_check_args args; |
987 | args.doexit = mode == normal; | |
145b8413 | 988 | args.dotrace = mode == trace; |
993b3242 | 989 | _dl_receive_error (print_missing_version, version_check_doit, &args); |
c84142e8 UD |
990 | } |
991 | ||
9a821cf9 | 992 | if (__builtin_expect (mode, normal) != normal) |
0200214b RM |
993 | { |
994 | /* We were run just to list the shared libraries. It is | |
995 | important that we do this before real relocation, because the | |
996 | functions we call below for output may no longer work properly | |
997 | after relocation. */ | |
d6b5d570 | 998 | if (! GL(dl_loaded)->l_info[DT_NEEDED]) |
35fc382a | 999 | _dl_printf ("\tstatically linked\n"); |
0200214b | 1000 | else |
ceb2d9aa UD |
1001 | { |
1002 | struct link_map *l; | |
1003 | ||
d6b5d570 | 1004 | if (GL(dl_debug_mask) & DL_DEBUG_PRELINK) |
32e6df36 | 1005 | { |
d6b5d570 | 1006 | struct r_scope_elem *scope = &GL(dl_loaded)->l_searchlist; |
32e6df36 UD |
1007 | |
1008 | for (i = 0; i < scope->r_nlist; i++) | |
1009 | { | |
1010 | l = scope->r_list [i]; | |
1011 | if (l->l_faked) | |
1012 | { | |
1013 | _dl_printf ("\t%s => not found\n", l->l_libname->name); | |
1014 | continue; | |
1015 | } | |
d6b5d570 UD |
1016 | if (_dl_name_match_p (GL(dl_trace_prelink), l)) |
1017 | GL(dl_trace_prelink_map) = l; | |
32e6df36 UD |
1018 | _dl_printf ("\t%s => %s (0x%0*Zx, 0x%0*Zx)\n", |
1019 | l->l_libname->name[0] ? l->l_libname->name | |
1020 | : _dl_argv[0] ?: "<main program>", | |
1021 | l->l_name[0] ? l->l_name | |
1022 | : _dl_argv[0] ?: "<main program>", | |
1023 | (int) sizeof l->l_map_start * 2, | |
1024 | l->l_map_start, | |
1025 | (int) sizeof l->l_addr * 2, | |
1026 | l->l_addr); | |
1027 | } | |
1028 | } | |
1029 | else | |
1030 | { | |
d6b5d570 | 1031 | for (l = GL(dl_loaded)->l_next; l; l = l->l_next) |
32e6df36 UD |
1032 | if (l->l_faked) |
1033 | /* The library was not found. */ | |
1034 | _dl_printf ("\t%s => not found\n", l->l_libname->name); | |
1035 | else | |
1036 | _dl_printf ("\t%s => %s (0x%0*Zx)\n", l->l_libname->name, | |
1037 | l->l_name, (int) sizeof l->l_map_start * 2, | |
1038 | l->l_map_start); | |
1039 | } | |
ceb2d9aa | 1040 | } |
1a3a58fd | 1041 | |
9a821cf9 | 1042 | if (__builtin_expect (mode, trace) != trace) |
cddcfecf RM |
1043 | for (i = 1; i < _dl_argc; ++i) |
1044 | { | |
1045 | const ElfW(Sym) *ref = NULL; | |
c0282c06 UD |
1046 | ElfW(Addr) loadbase; |
1047 | lookup_t result; | |
c0282c06 | 1048 | |
cff26a3e AJ |
1049 | result = INTUSE(_dl_lookup_symbol) (_dl_argv[i], GL(dl_loaded), |
1050 | &ref, GL(dl_loaded)->l_scope, | |
1051 | ELF_RTYPE_CLASS_PLT, 1); | |
c0282c06 UD |
1052 | |
1053 | loadbase = LOOKUP_VALUE_ADDRESS (result); | |
1054 | ||
35fc382a | 1055 | _dl_printf ("%s found at 0x%0*Zd in object at 0x%0*Zd\n", |
8a0746ae RM |
1056 | _dl_argv[i], |
1057 | (int) sizeof ref->st_value * 2, ref->st_value, | |
1058 | (int) sizeof loadbase * 2, loadbase); | |
cddcfecf | 1059 | } |
ce37fa88 | 1060 | else |
fd26970f | 1061 | { |
667b0577 | 1062 | /* If LD_WARN is set warn about undefined symbols. */ |
5688da55 | 1063 | if (GL(dl_lazy) >= 0 && GL(dl_verbose)) |
ce37fa88 UD |
1064 | { |
1065 | /* We have to do symbol dependency testing. */ | |
1066 | struct relocate_args args; | |
1067 | struct link_map *l; | |
993b3242 | 1068 | |
5688da55 | 1069 | args.lazy = GL(dl_lazy); |
fd26970f | 1070 | |
d6b5d570 | 1071 | l = GL(dl_loaded); |
ce37fa88 UD |
1072 | while (l->l_next) |
1073 | l = l->l_next; | |
1074 | do | |
1075 | { | |
d6b5d570 | 1076 | if (l != &GL(dl_rtld_map) && ! l->l_faked) |
ce37fa88 UD |
1077 | { |
1078 | args.l = l; | |
1079 | _dl_receive_error (print_unresolved, relocate_doit, | |
1080 | &args); | |
ce37fa88 UD |
1081 | } |
1082 | l = l->l_prev; | |
1083 | } while (l); | |
32e6df36 | 1084 | |
d6b5d570 UD |
1085 | if ((GL(dl_debug_mask) & DL_DEBUG_PRELINK) |
1086 | && GL(dl_rtld_map).l_opencount > 1) | |
cff26a3e AJ |
1087 | INTUSE(_dl_relocate_object) (&GL(dl_rtld_map), |
1088 | GL(dl_loaded)->l_scope, 0, 0); | |
ce37fa88 UD |
1089 | } |
1090 | ||
b0982c4a | 1091 | #define VERNEEDTAG (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (DT_VERNEED)) |
120b4c49 | 1092 | if (version_info) |
fd26970f | 1093 | { |
ce37fa88 UD |
1094 | /* Print more information. This means here, print information |
1095 | about the versions needed. */ | |
1096 | int first = 1; | |
d6b5d570 | 1097 | struct link_map *map = GL(dl_loaded); |
ce37fa88 | 1098 | |
d6b5d570 | 1099 | for (map = GL(dl_loaded); map != NULL; map = map->l_next) |
fd26970f | 1100 | { |
f41c8091 | 1101 | const char *strtab; |
ce37fa88 | 1102 | ElfW(Dyn) *dyn = map->l_info[VERNEEDTAG]; |
f41c8091 UD |
1103 | ElfW(Verneed) *ent; |
1104 | ||
1105 | if (dyn == NULL) | |
1106 | continue; | |
1107 | ||
a42195db | 1108 | strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); |
f41c8091 | 1109 | ent = (ElfW(Verneed) *) (map->l_addr + dyn->d_un.d_ptr); |
ce37fa88 | 1110 | |
f41c8091 | 1111 | if (first) |
ce37fa88 | 1112 | { |
35fc382a | 1113 | _dl_printf ("\n\tVersion information:\n"); |
f41c8091 UD |
1114 | first = 0; |
1115 | } | |
ce37fa88 | 1116 | |
35fc382a UD |
1117 | _dl_printf ("\t%s:\n", |
1118 | map->l_name[0] ? map->l_name : _dl_argv[0]); | |
f41c8091 UD |
1119 | |
1120 | while (1) | |
1121 | { | |
1122 | ElfW(Vernaux) *aux; | |
1123 | struct link_map *needed; | |
ce37fa88 | 1124 | |
f41c8091 UD |
1125 | needed = find_needed (strtab + ent->vn_file); |
1126 | aux = (ElfW(Vernaux) *) ((char *) ent + ent->vn_aux); | |
ce37fa88 UD |
1127 | |
1128 | while (1) | |
1129 | { | |
f41c8091 UD |
1130 | const char *fname = NULL; |
1131 | ||
f41c8091 | 1132 | if (needed != NULL |
ba9fcb3f UD |
1133 | && match_version (strtab + aux->vna_name, |
1134 | needed)) | |
f41c8091 UD |
1135 | fname = needed->l_name; |
1136 | ||
35fc382a UD |
1137 | _dl_printf ("\t\t%s (%s) %s=> %s\n", |
1138 | strtab + ent->vn_file, | |
1139 | strtab + aux->vna_name, | |
1140 | aux->vna_flags & VER_FLG_WEAK | |
1141 | ? "[WEAK] " : "", | |
1142 | fname ?: "not found"); | |
ce37fa88 | 1143 | |
f41c8091 UD |
1144 | if (aux->vna_next == 0) |
1145 | /* No more symbols. */ | |
ce37fa88 UD |
1146 | break; |
1147 | ||
f41c8091 UD |
1148 | /* Next symbol. */ |
1149 | aux = (ElfW(Vernaux) *) ((char *) aux | |
1150 | + aux->vna_next); | |
ce37fa88 | 1151 | } |
f41c8091 UD |
1152 | |
1153 | if (ent->vn_next == 0) | |
1154 | /* No more dependencies. */ | |
1155 | break; | |
1156 | ||
1157 | /* Next dependency. */ | |
1158 | ent = (ElfW(Verneed) *) ((char *) ent + ent->vn_next); | |
ce37fa88 | 1159 | } |
fd26970f | 1160 | } |
ce37fa88 | 1161 | } |
fd26970f | 1162 | } |
d66e34cd | 1163 | |
0200214b RM |
1164 | _exit (0); |
1165 | } | |
86d2c878 | 1166 | |
d6b5d570 UD |
1167 | if (GL(dl_loaded)->l_info [ADDRIDX (DT_GNU_LIBLIST)] |
1168 | && ! __builtin_expect (GL(dl_profile) != NULL, 0)) | |
32e6df36 UD |
1169 | { |
1170 | ElfW(Lib) *liblist, *liblistend; | |
1171 | struct link_map **r_list, **r_listend, *l; | |
9710f75d UD |
1172 | const char *strtab = (const void *) D_PTR (GL(dl_loaded), |
1173 | l_info[DT_STRTAB]); | |
32e6df36 | 1174 | |
d6b5d570 | 1175 | assert (GL(dl_loaded)->l_info [VALIDX (DT_GNU_LIBLISTSZ)] != NULL); |
32e6df36 | 1176 | liblist = (ElfW(Lib) *) |
d6b5d570 | 1177 | GL(dl_loaded)->l_info [ADDRIDX (DT_GNU_LIBLIST)]->d_un.d_ptr; |
32e6df36 UD |
1178 | liblistend = (ElfW(Lib) *) |
1179 | ((char *) liblist | |
d6b5d570 UD |
1180 | + GL(dl_loaded)->l_info [VALIDX (DT_GNU_LIBLISTSZ)]->d_un.d_val); |
1181 | r_list = GL(dl_loaded)->l_searchlist.r_list; | |
1182 | r_listend = r_list + GL(dl_loaded)->l_searchlist.r_nlist; | |
32e6df36 UD |
1183 | |
1184 | for (; r_list < r_listend && liblist < liblistend; r_list++) | |
1185 | { | |
1186 | l = *r_list; | |
1187 | ||
d6b5d570 | 1188 | if (l == GL(dl_loaded)) |
32e6df36 UD |
1189 | continue; |
1190 | ||
1191 | /* If the library is not mapped where it should, fail. */ | |
1192 | if (l->l_addr) | |
1193 | break; | |
1194 | ||
1195 | /* Next, check if checksum matches. */ | |
1196 | if (l->l_info [VALIDX(DT_CHECKSUM)] == NULL | |
1197 | || l->l_info [VALIDX(DT_CHECKSUM)]->d_un.d_val | |
1198 | != liblist->l_checksum) | |
1199 | break; | |
1200 | ||
1201 | if (l->l_info [VALIDX(DT_GNU_PRELINKED)] == NULL | |
1202 | || l->l_info [VALIDX(DT_GNU_PRELINKED)]->d_un.d_val | |
1203 | != liblist->l_time_stamp) | |
1204 | break; | |
1205 | ||
1206 | if (! _dl_name_match_p (strtab + liblist->l_name, l)) | |
1207 | break; | |
1208 | ||
1209 | ++liblist; | |
1210 | } | |
1211 | ||
1212 | ||
1213 | if (r_list == r_listend && liblist == liblistend) | |
164a7164 | 1214 | prelinked = true; |
32e6df36 | 1215 | |
d6b5d570 | 1216 | if (__builtin_expect (GL(dl_debug_mask) & DL_DEBUG_LIBS, 0)) |
32e6df36 UD |
1217 | _dl_printf ("\nprelink checking: %s\n", prelinked ? "ok" : "failed"); |
1218 | } | |
1219 | ||
1220 | if (prelinked) | |
1221 | { | |
d6b5d570 | 1222 | if (GL(dl_loaded)->l_info [ADDRIDX (DT_GNU_CONFLICT)] != NULL) |
32e6df36 UD |
1223 | { |
1224 | ElfW(Rela) *conflict, *conflictend; | |
1225 | #ifndef HP_TIMING_NONAVAIL | |
1226 | hp_timing_t start; | |
1227 | hp_timing_t stop; | |
1228 | #endif | |
1229 | ||
1230 | HP_TIMING_NOW (start); | |
d6b5d570 | 1231 | assert (GL(dl_loaded)->l_info [VALIDX (DT_GNU_CONFLICTSZ)] != NULL); |
32e6df36 | 1232 | conflict = (ElfW(Rela) *) |
d6b5d570 | 1233 | GL(dl_loaded)->l_info [ADDRIDX (DT_GNU_CONFLICT)]->d_un.d_ptr; |
32e6df36 UD |
1234 | conflictend = (ElfW(Rela) *) |
1235 | ((char *) conflict | |
d6b5d570 UD |
1236 | + GL(dl_loaded)->l_info [VALIDX (DT_GNU_CONFLICTSZ)]->d_un.d_val); |
1237 | _dl_resolve_conflicts (GL(dl_loaded), conflict, conflictend); | |
32e6df36 UD |
1238 | HP_TIMING_NOW (stop); |
1239 | HP_TIMING_DIFF (relocate_time, start, stop); | |
1240 | } | |
1241 | ||
1242 | _dl_sysdep_start_cleanup (); | |
1243 | } | |
1244 | else | |
164a7164 UD |
1245 | { |
1246 | /* Now we have all the objects loaded. Relocate them all except for | |
1247 | the dynamic linker itself. We do this in reverse order so that copy | |
1248 | relocs of earlier objects overwrite the data written by later | |
1249 | objects. We do not re-relocate the dynamic linker itself in this | |
1250 | loop because that could result in the GOT entries for functions we | |
1251 | call being changed, and that would break us. It is safe to relocate | |
1252 | the dynamic linker out of order because it has no copy relocs (we | |
1253 | know that because it is self-contained). */ | |
1254 | ||
1255 | struct link_map *l; | |
1256 | int consider_profiling = GL(dl_profile) != NULL; | |
8b07d6a8 | 1257 | #ifndef HP_TIMING_NONAVAIL |
164a7164 UD |
1258 | hp_timing_t start; |
1259 | hp_timing_t stop; | |
1260 | hp_timing_t add; | |
8b07d6a8 | 1261 | #endif |
c0fb8a56 | 1262 | |
164a7164 UD |
1263 | /* If we are profiling we also must do lazy reloaction. */ |
1264 | GL(dl_lazy) |= consider_profiling; | |
c0fb8a56 | 1265 | |
164a7164 UD |
1266 | l = GL(dl_loaded); |
1267 | while (l->l_next) | |
1268 | l = l->l_next; | |
db276fa1 | 1269 | |
164a7164 UD |
1270 | HP_TIMING_NOW (start); |
1271 | do | |
1272 | { | |
1273 | /* While we are at it, help the memory handling a bit. We have to | |
1274 | mark some data structures as allocated with the fake malloc() | |
1275 | implementation in ld.so. */ | |
1276 | struct libname_list *lnp = l->l_libname->next; | |
752a2a50 | 1277 | |
164a7164 UD |
1278 | while (__builtin_expect (lnp != NULL, 0)) |
1279 | { | |
1280 | lnp->dont_free = 1; | |
1281 | lnp = lnp->next; | |
1282 | } | |
752a2a50 | 1283 | |
164a7164 | 1284 | if (l != &GL(dl_rtld_map)) |
cff26a3e AJ |
1285 | INTUSE(_dl_relocate_object) (l, l->l_scope, GL(dl_lazy), |
1286 | consider_profiling); | |
be935610 | 1287 | |
164a7164 UD |
1288 | l = l->l_prev; |
1289 | } | |
1290 | while (l); | |
1291 | HP_TIMING_NOW (stop); | |
1292 | ||
1293 | HP_TIMING_DIFF (relocate_time, start, stop); | |
1294 | ||
1295 | /* Do any necessary cleanups for the startup OS interface code. | |
1296 | We do these now so that no calls are made after rtld re-relocation | |
1297 | which might be resolved to different functions than we expect. | |
1298 | We cannot do this before relocating the other objects because | |
1299 | _dl_relocate_object might need to call `mprotect' for DT_TEXTREL. */ | |
1300 | _dl_sysdep_start_cleanup (); | |
1301 | ||
1302 | /* Now enable profiling if needed. Like the previous call, | |
1303 | this has to go here because the calls it makes should use the | |
1304 | rtld versions of the functions (particularly calloc()), but it | |
1305 | needs to have _dl_profile_map set up by the relocator. */ | |
1306 | if (__builtin_expect (GL(dl_profile_map) != NULL, 0)) | |
1307 | /* We must prepare the profiling. */ | |
cff26a3e | 1308 | INTUSE(_dl_start_profile) (GL(dl_profile_map), GL(dl_profile_output)); |
164a7164 UD |
1309 | |
1310 | if (GL(dl_rtld_map).l_opencount > 1) | |
1311 | { | |
1312 | /* There was an explicit ref to the dynamic linker as a shared lib. | |
1313 | Re-relocate ourselves with user-controlled symbol definitions. */ | |
1314 | HP_TIMING_NOW (start); | |
cff26a3e AJ |
1315 | INTUSE(_dl_relocate_object) (&GL(dl_rtld_map), GL(dl_loaded)->l_scope, |
1316 | 0, 0); | |
164a7164 UD |
1317 | HP_TIMING_NOW (stop); |
1318 | HP_TIMING_DIFF (add, start, stop); | |
1319 | HP_TIMING_ACCUM_NT (relocate_time, add); | |
1320 | } | |
1321 | } | |
ac16e905 | 1322 | |
be935610 | 1323 | /* Now set up the variable which helps the assembler startup code. */ |
d6b5d570 UD |
1324 | GL(dl_main_searchlist) = &GL(dl_loaded)->l_searchlist; |
1325 | GL(dl_global_scope)[0] = &GL(dl_loaded)->l_searchlist; | |
be935610 | 1326 | |
32e6df36 | 1327 | /* Save the information about the original global scope list since |
604510f7 | 1328 | we need it in the memory handling later. */ |
d6b5d570 | 1329 | GL(dl_initial_searchlist) = *GL(dl_main_searchlist); |
604510f7 | 1330 | |
4d6acc61 RM |
1331 | { |
1332 | /* Initialize _r_debug. */ | |
d6b5d570 | 1333 | struct r_debug *r = _dl_debug_initialize (GL(dl_rtld_map).l_addr); |
ceb2d9aa | 1334 | struct link_map *l; |
4d6acc61 | 1335 | |
d6b5d570 | 1336 | l = GL(dl_loaded); |
ec42724d RM |
1337 | |
1338 | #ifdef ELF_MACHINE_DEBUG_SETUP | |
1339 | ||
1340 | /* Some machines (e.g. MIPS) don't use DT_DEBUG in this way. */ | |
1341 | ||
1342 | ELF_MACHINE_DEBUG_SETUP (l, r); | |
d6b5d570 | 1343 | ELF_MACHINE_DEBUG_SETUP (&GL(dl_rtld_map), r); |
ec42724d RM |
1344 | |
1345 | #else | |
1346 | ||
4d6acc61 RM |
1347 | if (l->l_info[DT_DEBUG]) |
1348 | /* There is a DT_DEBUG entry in the dynamic section. Fill it in | |
1349 | with the run-time address of the r_debug structure */ | |
1350 | l->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
1351 | ||
d746b89c RM |
1352 | /* Fill in the pointer in the dynamic linker's own dynamic section, in |
1353 | case you run gdb on the dynamic linker directly. */ | |
d6b5d570 UD |
1354 | if (GL(dl_rtld_map).l_info[DT_DEBUG]) |
1355 | GL(dl_rtld_map).l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
d746b89c | 1356 | |
ec42724d RM |
1357 | #endif |
1358 | ||
4d6acc61 RM |
1359 | /* Notify the debugger that all objects are now mapped in. */ |
1360 | r->r_state = RT_ADD; | |
cff26a3e | 1361 | INTUSE(_dl_debug_state) (); |
4d6acc61 | 1362 | } |
0200214b | 1363 | |
08cac4ac UD |
1364 | #ifndef MAP_COPY |
1365 | /* We must munmap() the cache file. */ | |
cff26a3e | 1366 | INTUSE(_dl_unload_cache) (); |
08cac4ac UD |
1367 | #endif |
1368 | ||
d66e34cd RM |
1369 | /* Once we return, _dl_sysdep_start will invoke |
1370 | the DT_INIT functions and then *USER_ENTRY. */ | |
1371 | } | |
fd26970f UD |
1372 | \f |
1373 | /* This is a little helper function for resolving symbols while | |
1374 | tracing the binary. */ | |
1375 | static void | |
c84142e8 UD |
1376 | print_unresolved (int errcode __attribute__ ((unused)), const char *objname, |
1377 | const char *errstring) | |
fd26970f | 1378 | { |
3996f34b UD |
1379 | if (objname[0] == '\0') |
1380 | objname = _dl_argv[0] ?: "<main program>"; | |
35fc382a | 1381 | _dl_error_printf ("%s (%s)\n", errstring, objname); |
fd26970f | 1382 | } |
c84142e8 UD |
1383 | \f |
1384 | /* This is a little helper function for resolving symbols while | |
1385 | tracing the binary. */ | |
1386 | static void | |
1387 | print_missing_version (int errcode __attribute__ ((unused)), | |
1388 | const char *objname, const char *errstring) | |
1389 | { | |
35fc382a UD |
1390 | _dl_error_printf ("%s: %s: %s\n", _dl_argv[0] ?: "<program name unknown>", |
1391 | objname, errstring); | |
c84142e8 | 1392 | } |
ea278354 | 1393 | \f |
7dea968e UD |
1394 | /* Nonzero if any of the debugging options is enabled. */ |
1395 | static int any_debug; | |
1396 | ||
b5efde2f UD |
1397 | /* Process the string given as the parameter which explains which debugging |
1398 | options are enabled. */ | |
1399 | static void | |
14c44e2e | 1400 | process_dl_debug (const char *dl_debug) |
b5efde2f | 1401 | { |
3e2040c8 UD |
1402 | /* When adding new entries make sure that the maximal length of a name |
1403 | is correctly handled in the LD_DEBUG_HELP code below. */ | |
1404 | static const struct | |
1405 | { | |
379d4ec4 UD |
1406 | unsigned char len; |
1407 | const char name[10]; | |
3e2040c8 UD |
1408 | const char helptext[41]; |
1409 | unsigned short int mask; | |
1410 | } debopts[] = | |
1411 | { | |
379d4ec4 UD |
1412 | #define LEN_AND_STR(str) sizeof (str) - 1, str |
1413 | { LEN_AND_STR ("libs"), "display library search paths", | |
3e2040c8 | 1414 | DL_DEBUG_LIBS | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 1415 | { LEN_AND_STR ("reloc"), "display relocation processing", |
3e2040c8 | 1416 | DL_DEBUG_RELOC | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 1417 | { LEN_AND_STR ("files"), "display progress for input file", |
3e2040c8 | 1418 | DL_DEBUG_FILES | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 1419 | { LEN_AND_STR ("symbols"), "display symbol table processing", |
3e2040c8 | 1420 | DL_DEBUG_SYMBOLS | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 1421 | { LEN_AND_STR ("bindings"), "display information about symbol binding", |
3e2040c8 | 1422 | DL_DEBUG_BINDINGS | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 1423 | { LEN_AND_STR ("versions"), "display version dependencies", |
3e2040c8 | 1424 | DL_DEBUG_VERSIONS | DL_DEBUG_IMPCALLS }, |
379d4ec4 | 1425 | { LEN_AND_STR ("all"), "all previous options combined", |
3e2040c8 UD |
1426 | DL_DEBUG_LIBS | DL_DEBUG_RELOC | DL_DEBUG_FILES | DL_DEBUG_SYMBOLS |
1427 | | DL_DEBUG_BINDINGS | DL_DEBUG_VERSIONS | DL_DEBUG_IMPCALLS }, | |
379d4ec4 | 1428 | { LEN_AND_STR ("statistics"), "display relocation statistics", |
3e2040c8 | 1429 | DL_DEBUG_STATISTICS }, |
379d4ec4 | 1430 | { LEN_AND_STR ("help"), "display this help message and exit", |
3e2040c8 UD |
1431 | DL_DEBUG_HELP }, |
1432 | }; | |
1433 | #define ndebopts (sizeof (debopts) / sizeof (debopts[0])) | |
3e2040c8 | 1434 | |
379d4ec4 UD |
1435 | /* Skip separating white spaces and commas. */ |
1436 | while (*dl_debug != '\0') | |
b5efde2f | 1437 | { |
379d4ec4 | 1438 | if (*dl_debug != ' ' && *dl_debug != ',' && *dl_debug != ':') |
b5efde2f | 1439 | { |
3e2040c8 | 1440 | size_t cnt; |
379d4ec4 | 1441 | size_t len = 1; |
77aba05b | 1442 | |
379d4ec4 UD |
1443 | while (dl_debug[len] != '\0' && dl_debug[len] != ' ' |
1444 | && dl_debug[len] != ',' && dl_debug[len] != ':') | |
1445 | ++len; | |
14c44e2e | 1446 | |
3e2040c8 | 1447 | for (cnt = 0; cnt < ndebopts; ++cnt) |
379d4ec4 UD |
1448 | if (debopts[cnt].len == len |
1449 | && memcmp (dl_debug, debopts[cnt].name, len) == 0) | |
3e2040c8 | 1450 | { |
d6b5d570 | 1451 | GL(dl_debug_mask) |= debopts[cnt].mask; |
5688da55 | 1452 | any_debug = 1; |
3e2040c8 UD |
1453 | break; |
1454 | } | |
77aba05b | 1455 | |
3e2040c8 UD |
1456 | if (cnt == ndebopts) |
1457 | { | |
1458 | /* Display a warning and skip everything until next | |
1459 | separator. */ | |
1460 | char *copy = strndupa (dl_debug, len); | |
1461 | _dl_error_printf ("\ | |
1462 | warning: debug option `%s' unknown; try LD_DEBUG=help\n", copy); | |
379d4ec4 UD |
1463 | } |
1464 | ||
1465 | dl_debug += len; | |
1466 | continue; | |
3e2040c8 | 1467 | } |
379d4ec4 UD |
1468 | |
1469 | ++dl_debug; | |
3e2040c8 | 1470 | } |
77aba05b | 1471 | |
d6b5d570 | 1472 | if (GL(dl_debug_mask) & DL_DEBUG_HELP) |
3e2040c8 UD |
1473 | { |
1474 | size_t cnt; | |
14c44e2e | 1475 | |
3e2040c8 UD |
1476 | _dl_printf ("\ |
1477 | Valid options for the LD_DEBUG environment variable are:\n\n"); | |
db276fa1 | 1478 | |
3e2040c8 | 1479 | for (cnt = 0; cnt < ndebopts; ++cnt) |
37d8b778 UD |
1480 | _dl_printf (" %.*s%s%s\n", debopts[cnt].len, debopts[cnt].name, |
1481 | " " + debopts[cnt].len - 3, | |
3e2040c8 | 1482 | debopts[cnt].helptext); |
14c44e2e | 1483 | |
3e2040c8 UD |
1484 | _dl_printf ("\n\ |
1485 | To direct the debugging output into a file instead of standard output\n\ | |
1486 | a filename can be specified using the LD_DEBUG_OUTPUT environment variable.\n"); | |
1487 | _exit (0); | |
b5efde2f | 1488 | } |
b5efde2f UD |
1489 | } |
1490 | \f | |
ea278354 UD |
1491 | /* Process all environments variables the dynamic linker must recognize. |
1492 | Since all of them start with `LD_' we are a bit smarter while finding | |
1493 | all the entries. */ | |
67c94753 UD |
1494 | extern char **_environ; |
1495 | ||
d6b5d570 | 1496 | |
ea278354 | 1497 | static void |
ba9fcb3f | 1498 | process_envvars (enum mode *modep) |
ea278354 | 1499 | { |
67c94753 | 1500 | char **runp = _environ; |
ea278354 UD |
1501 | char *envline; |
1502 | enum mode mode = normal; | |
7dea968e | 1503 | char *debug_output = NULL; |
ea278354 UD |
1504 | |
1505 | /* This is the default place for profiling data file. */ | |
d6b5d570 UD |
1506 | GL(dl_profile_output) = &"/var/tmp\0/var/profile"[__libc_enable_secure |
1507 | ? 9 : 0]; | |
ea278354 UD |
1508 | |
1509 | while ((envline = _dl_next_ld_env_entry (&runp)) != NULL) | |
1510 | { | |
379d4ec4 UD |
1511 | size_t len = 0; |
1512 | ||
1513 | while (envline[len] != '\0' && envline[len] != '=') | |
1514 | ++len; | |
ea278354 | 1515 | |
75e8d1f5 UD |
1516 | if (envline[len] != '=') |
1517 | /* This is a "LD_" variable at the end of the string without | |
1518 | a '=' character. Ignore it since otherwise we will access | |
1519 | invalid memory below. */ | |
67c94753 | 1520 | continue; |
75e8d1f5 | 1521 | |
67c94753 | 1522 | switch (len) |
ea278354 | 1523 | { |
14c44e2e UD |
1524 | case 4: |
1525 | /* Warning level, verbose or not. */ | |
67c94753 | 1526 | if (memcmp (envline, "WARN", 4) == 0) |
d6b5d570 | 1527 | GL(dl_verbose) = envline[5] != '\0'; |
14c44e2e | 1528 | break; |
ea278354 | 1529 | |
14c44e2e UD |
1530 | case 5: |
1531 | /* Debugging of the dynamic linker? */ | |
67c94753 UD |
1532 | if (memcmp (envline, "DEBUG", 5) == 0) |
1533 | process_dl_debug (&envline[6]); | |
14c44e2e | 1534 | break; |
b5efde2f | 1535 | |
14c44e2e UD |
1536 | case 7: |
1537 | /* Print information about versions. */ | |
67c94753 | 1538 | if (memcmp (envline, "VERBOSE", 7) == 0) |
14c44e2e | 1539 | { |
67c94753 | 1540 | version_info = envline[8] != '\0'; |
14c44e2e UD |
1541 | break; |
1542 | } | |
7dea968e | 1543 | |
14c44e2e | 1544 | /* List of objects to be preloaded. */ |
67c94753 | 1545 | if (memcmp (envline, "PRELOAD", 7) == 0) |
14c44e2e | 1546 | { |
67c94753 | 1547 | preloadlist = &envline[8]; |
14c44e2e UD |
1548 | break; |
1549 | } | |
120b4c49 | 1550 | |
14c44e2e | 1551 | /* Which shared object shall be profiled. */ |
c95f3fd4 | 1552 | if (memcmp (envline, "PROFILE", 7) == 0 && envline[8] != '\0') |
d6b5d570 | 1553 | GL(dl_profile) = &envline[8]; |
14c44e2e | 1554 | break; |
120b4c49 | 1555 | |
14c44e2e UD |
1556 | case 8: |
1557 | /* Do we bind early? */ | |
67c94753 | 1558 | if (memcmp (envline, "BIND_NOW", 8) == 0) |
f53c03c2 | 1559 | { |
5688da55 | 1560 | GL(dl_lazy) = envline[9] == '\0'; |
f53c03c2 UD |
1561 | break; |
1562 | } | |
67c94753 | 1563 | if (memcmp (envline, "BIND_NOT", 8) == 0) |
d6b5d570 | 1564 | GL(dl_bind_not) = envline[9] != '\0'; |
14c44e2e | 1565 | break; |
ea278354 | 1566 | |
14c44e2e UD |
1567 | case 9: |
1568 | /* Test whether we want to see the content of the auxiliary | |
1569 | array passed up from the kernel. */ | |
67c94753 | 1570 | if (memcmp (envline, "SHOW_AUXV", 9) == 0) |
14c44e2e UD |
1571 | _dl_show_auxv (); |
1572 | break; | |
ea278354 | 1573 | |
12264bd7 | 1574 | case 10: |
3081378b | 1575 | /* Mask for the important hardware capabilities. */ |
67c94753 | 1576 | if (memcmp (envline, "HWCAP_MASK", 10) == 0) |
d6b5d570 | 1577 | GL(dl_hwcap_mask) = __strtoul_internal (&envline[11], NULL, 0, 0); |
12264bd7 UD |
1578 | break; |
1579 | ||
f787edde UD |
1580 | case 11: |
1581 | /* Path where the binary is found. */ | |
45769315 | 1582 | if (!__libc_enable_secure |
67c94753 | 1583 | && memcmp (envline, "ORIGIN_PATH", 11) == 0) |
d6b5d570 | 1584 | GL(dl_origin_path) = &envline[12]; |
f787edde UD |
1585 | break; |
1586 | ||
14c44e2e | 1587 | case 12: |
dec126b4 | 1588 | /* The library search path. */ |
67c94753 | 1589 | if (memcmp (envline, "LIBRARY_PATH", 12) == 0) |
dec126b4 | 1590 | { |
67c94753 | 1591 | library_path = &envline[13]; |
dec126b4 UD |
1592 | break; |
1593 | } | |
1594 | ||
14c44e2e | 1595 | /* Where to place the profiling data file. */ |
67c94753 | 1596 | if (memcmp (envline, "DEBUG_OUTPUT", 12) == 0) |
14c44e2e | 1597 | { |
67c94753 | 1598 | debug_output = &envline[13]; |
14c44e2e UD |
1599 | break; |
1600 | } | |
ea278354 | 1601 | |
67c94753 | 1602 | if (memcmp (envline, "DYNAMIC_WEAK", 12) == 0) |
5688da55 | 1603 | GL(dl_dynamic_weak) = 1; |
14c44e2e | 1604 | break; |
ea278354 | 1605 | |
14c44e2e UD |
1606 | case 14: |
1607 | /* Where to place the profiling data file. */ | |
3081378b | 1608 | if (!__libc_enable_secure |
3e2040c8 UD |
1609 | && memcmp (envline, "PROFILE_OUTPUT", 14) == 0 |
1610 | && envline[15] != '\0') | |
d6b5d570 | 1611 | GL(dl_profile_output) = &envline[15]; |
14c44e2e | 1612 | break; |
120b4c49 | 1613 | |
32e6df36 UD |
1614 | case 16: |
1615 | /* The mode of the dynamic linker can be set. */ | |
1616 | if (memcmp (envline, "TRACE_PRELINKING", 16) == 0) | |
1617 | { | |
1618 | mode = trace; | |
d6b5d570 UD |
1619 | GL(dl_verbose) = 1; |
1620 | GL(dl_debug_mask) |= DL_DEBUG_PRELINK; | |
1621 | GL(dl_trace_prelink) = &envline[17]; | |
32e6df36 UD |
1622 | } |
1623 | break; | |
1624 | ||
14c44e2e UD |
1625 | case 20: |
1626 | /* The mode of the dynamic linker can be set. */ | |
67c94753 | 1627 | if (memcmp (envline, "TRACE_LOADED_OBJECTS", 20) == 0) |
14c44e2e UD |
1628 | mode = trace; |
1629 | break; | |
e2102c14 UD |
1630 | |
1631 | /* We might have some extra environment variable to handle. This | |
1632 | is tricky due to the pre-processing of the length of the name | |
1633 | in the switch statement here. The code here assumes that added | |
1634 | environment variables have a different length. */ | |
1635 | #ifdef EXTRA_LD_ENVVARS | |
1636 | EXTRA_LD_ENVVARS | |
1637 | #endif | |
ea278354 UD |
1638 | } |
1639 | } | |
1640 | ||
3e2040c8 UD |
1641 | /* The caller wants this information. */ |
1642 | *modep = mode; | |
1643 | ||
4bae5567 UD |
1644 | /* Extra security for SUID binaries. Remove all dangerous environment |
1645 | variables. */ | |
ba9fcb3f | 1646 | if (__builtin_expect (__libc_enable_secure, 0)) |
4bae5567 | 1647 | { |
c95f3fd4 | 1648 | static const char unsecure_envvars[] = |
4bae5567 UD |
1649 | #ifdef EXTRA_UNSECURE_ENVVARS |
1650 | EXTRA_UNSECURE_ENVVARS | |
1651 | #endif | |
c95f3fd4 UD |
1652 | UNSECURE_ENVVARS; |
1653 | const char *nextp; | |
1654 | ||
1655 | nextp = unsecure_envvars; | |
1656 | do | |
1657 | { | |
1658 | unsetenv (nextp); | |
9710f75d UD |
1659 | /* We could use rawmemchr but this need not be fast. */ |
1660 | nextp = (char *) (strchr) (nextp, '\0') + 1; | |
c95f3fd4 UD |
1661 | } |
1662 | while (*nextp != '\0'); | |
74955460 UD |
1663 | |
1664 | if (__access ("/etc/suid-debug", F_OK) != 0) | |
1665 | unsetenv ("MALLOC_CHECK_"); | |
4bae5567 | 1666 | } |
7dea968e UD |
1667 | /* If we have to run the dynamic linker in debugging mode and the |
1668 | LD_DEBUG_OUTPUT environment variable is given, we write the debug | |
1669 | messages to this file. */ | |
3e2040c8 | 1670 | else if (any_debug && debug_output != NULL) |
7dea968e | 1671 | { |
5f2de337 UD |
1672 | #ifdef O_NOFOLLOW |
1673 | const int flags = O_WRONLY | O_APPEND | O_CREAT | O_NOFOLLOW; | |
1674 | #else | |
1675 | const int flags = O_WRONLY | O_APPEND | O_CREAT; | |
1676 | #endif | |
7a2fd787 UD |
1677 | size_t name_len = strlen (debug_output); |
1678 | char buf[name_len + 12]; | |
1679 | char *startp; | |
1680 | ||
1681 | buf[name_len + 11] = '\0'; | |
9710f75d | 1682 | startp = _itoa (__getpid (), &buf[name_len + 11], 10, 0); |
7a2fd787 UD |
1683 | *--startp = '.'; |
1684 | startp = memcpy (startp - name_len, debug_output, name_len); | |
1685 | ||
5688da55 UD |
1686 | GL(dl_debug_fd) = __open (startp, flags, DEFFILEMODE); |
1687 | if (GL(dl_debug_fd) == -1) | |
7dea968e | 1688 | /* We use standard output if opening the file failed. */ |
5688da55 | 1689 | GL(dl_debug_fd) = STDOUT_FILENO; |
7dea968e | 1690 | } |
ea278354 | 1691 | } |
db276fa1 UD |
1692 | |
1693 | ||
1694 | /* Print the various times we collected. */ | |
1695 | static void | |
1696 | print_statistics (void) | |
1697 | { | |
8b07d6a8 | 1698 | #ifndef HP_TIMING_NONAVAIL |
f457369d | 1699 | char buf[200]; |
db276fa1 UD |
1700 | char *cp; |
1701 | char *wp; | |
1702 | ||
1703 | /* Total time rtld used. */ | |
1704 | if (HP_TIMING_AVAIL) | |
1705 | { | |
1706 | HP_TIMING_PRINT (buf, sizeof (buf), rtld_total_time); | |
cff26a3e AJ |
1707 | INTUSE(_dl_debug_printf) ("\nruntime linker statistics:\n" |
1708 | " total startup time in dynamic loader: %s\n", | |
1709 | buf); | |
db276fa1 UD |
1710 | } |
1711 | ||
1712 | /* Print relocation statistics. */ | |
1713 | if (HP_TIMING_AVAIL) | |
1714 | { | |
35fc382a | 1715 | char pbuf[30]; |
db276fa1 | 1716 | HP_TIMING_PRINT (buf, sizeof (buf), relocate_time); |
9710f75d UD |
1717 | cp = _itoa ((1000ULL * relocate_time) / rtld_total_time, |
1718 | pbuf + sizeof (pbuf), 10, 0); | |
35fc382a UD |
1719 | wp = pbuf; |
1720 | switch (pbuf + sizeof (pbuf) - cp) | |
db276fa1 UD |
1721 | { |
1722 | case 3: | |
1723 | *wp++ = *cp++; | |
1724 | case 2: | |
1725 | *wp++ = *cp++; | |
1726 | case 1: | |
1727 | *wp++ = '.'; | |
1728 | *wp++ = *cp++; | |
1729 | } | |
1730 | *wp = '\0'; | |
cff26a3e | 1731 | INTUSE(_dl_debug_printf) ("\ |
7969407a | 1732 | time needed for relocation: %s (%s%%)\n", |
cff26a3e | 1733 | buf, pbuf); |
db276fa1 | 1734 | } |
1531e094 | 1735 | #endif |
cff26a3e AJ |
1736 | INTUSE(_dl_debug_printf) (" number of relocations: %lu\n", |
1737 | GL(dl_num_relocations)); | |
1738 | INTUSE(_dl_debug_printf) (" number of relocations from cache: %lu\n", | |
1739 | GL(dl_num_cache_relocations)); | |
db276fa1 | 1740 | |
1531e094 | 1741 | #ifndef HP_TIMING_NONAVAIL |
db276fa1 UD |
1742 | /* Time spend while loading the object and the dependencies. */ |
1743 | if (HP_TIMING_AVAIL) | |
1744 | { | |
35fc382a | 1745 | char pbuf[30]; |
db276fa1 | 1746 | HP_TIMING_PRINT (buf, sizeof (buf), load_time); |
9710f75d UD |
1747 | cp = _itoa ((1000ULL * load_time) / rtld_total_time, |
1748 | pbuf + sizeof (pbuf), 10, 0); | |
35fc382a UD |
1749 | wp = pbuf; |
1750 | switch (pbuf + sizeof (pbuf) - cp) | |
db276fa1 UD |
1751 | { |
1752 | case 3: | |
1753 | *wp++ = *cp++; | |
1754 | case 2: | |
1755 | *wp++ = *cp++; | |
1756 | case 1: | |
1757 | *wp++ = '.'; | |
1758 | *wp++ = *cp++; | |
1759 | } | |
1760 | *wp = '\0'; | |
cff26a3e | 1761 | INTUSE(_dl_debug_printf) ("\ |
7969407a | 1762 | time needed to load objects: %s (%s%%)\n", |
cff26a3e | 1763 | buf, pbuf); |
db276fa1 | 1764 | } |
1531e094 | 1765 | #endif |
db276fa1 | 1766 | } |