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d66e34cd | 1 | /* Run time dynamic linker. |
948c3e72 | 2 | Copyright (C) 1995, 1996 Free Software Foundation, Inc. |
d66e34cd RM |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU 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. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Library General Public License for more details. | |
14 | ||
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 | |
17 | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | |
18 | Cambridge, MA 02139, USA. */ | |
19 | ||
20 | #include <link.h> | |
d66e34cd RM |
21 | #include <stddef.h> |
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. */ |
21ee7166 | 26 | #include "../stdio-common/_itoa.h" |
b1dbbaa4 | 27 | #include <assert.h> |
f5348425 RM |
28 | #include "dynamic-link.h" |
29 | ||
30 | ||
d66e34cd RM |
31 | /* System-specific function to do initial startup for the dynamic linker. |
32 | After this, file access calls and getenv must work. This is responsible | |
cddcfecf | 33 | for setting __libc_enable_secure if we need to be secure (e.g. setuid), |
d66e34cd | 34 | and for setting _dl_argc and _dl_argv, and then calling _dl_main. */ |
266180eb RM |
35 | extern ElfW(Addr) _dl_sysdep_start (void **start_argptr, |
36 | void (*dl_main) (const ElfW(Phdr) *phdr, | |
37 | ElfW(Half) phent, | |
38 | ElfW(Addr) *user_entry)); | |
4cb20290 | 39 | extern void _dl_sysdep_start_cleanup (void); |
d66e34cd | 40 | |
14bab8de UD |
41 | /* System-dependent function to read a file's whole contents |
42 | in the most convenient manner available. */ | |
43 | extern void *_dl_sysdep_read_whole_file (const char *filename, | |
44 | size_t *filesize_ptr, | |
45 | int mmap_prot); | |
46 | ||
d66e34cd RM |
47 | int _dl_argc; |
48 | char **_dl_argv; | |
4cb20290 | 49 | const char *_dl_rpath; |
d66e34cd | 50 | |
39778c6c UD |
51 | /* Set nonzero during loading and initialization of executable and |
52 | libraries, cleared before the executable's entry point runs. This | |
53 | must not be initialized to nonzero, because the unused dynamic | |
54 | linker loaded in for libc.so's "ld.so.1" dep will provide the | |
55 | definition seen by libc.so's initializer; that value must be zero, | |
56 | and will be since that dynamic linker's _dl_start and dl_main will | |
57 | never be called. */ | |
58 | int _dl_starting_up; | |
59 | ||
266180eb RM |
60 | static void dl_main (const ElfW(Phdr) *phdr, |
61 | ElfW(Half) phent, | |
62 | ElfW(Addr) *user_entry); | |
d66e34cd | 63 | |
ee188d55 | 64 | struct link_map _dl_rtld_map; |
86d2c878 | 65 | |
b1dbbaa4 RM |
66 | #ifdef RTLD_START |
67 | RTLD_START | |
68 | #else | |
69 | #error "sysdeps/MACHINE/dl-machine.h fails to define RTLD_START" | |
70 | #endif | |
71 | ||
266180eb | 72 | ElfW(Addr) |
d66e34cd RM |
73 | _dl_start (void *arg) |
74 | { | |
86d2c878 | 75 | struct link_map bootstrap_map; |
d66e34cd | 76 | |
b1dbbaa4 RM |
77 | /* This #define produces dynamic linking inline functions for |
78 | bootstrap relocation instead of general-purpose relocation. */ | |
79 | #define RTLD_BOOTSTRAP | |
706074a5 | 80 | #define RESOLVE(sym, flags) bootstrap_map.l_addr |
b1dbbaa4 RM |
81 | #include "dynamic-link.h" |
82 | ||
d66e34cd | 83 | /* Figure out the run-time load address of the dynamic linker itself. */ |
86d2c878 | 84 | bootstrap_map.l_addr = elf_machine_load_address (); |
d66e34cd RM |
85 | |
86 | /* Read our own dynamic section and fill in the info array. | |
87 | Conveniently, the first element of the GOT contains the | |
88 | offset of _DYNAMIC relative to the run-time load address. */ | |
86d2c878 RM |
89 | bootstrap_map.l_ld = (void *) bootstrap_map.l_addr + *elf_machine_got (); |
90 | elf_get_dynamic_info (bootstrap_map.l_ld, bootstrap_map.l_info); | |
d66e34cd RM |
91 | |
92 | #ifdef ELF_MACHINE_BEFORE_RTLD_RELOC | |
86d2c878 | 93 | ELF_MACHINE_BEFORE_RTLD_RELOC (bootstrap_map.l_info); |
d66e34cd RM |
94 | #endif |
95 | ||
96 | /* Relocate ourselves so we can do normal function calls and | |
97 | data access using the global offset table. */ | |
421f82e5 | 98 | |
f51d1dfd | 99 | ELF_DYNAMIC_RELOCATE (&bootstrap_map, 0); |
421f82e5 | 100 | |
d66e34cd RM |
101 | |
102 | /* Now life is sane; we can call functions and access global data. | |
103 | Set up to use the operating system facilities, and find out from | |
104 | the operating system's program loader where to find the program | |
105 | header table in core. */ | |
106 | ||
86d2c878 RM |
107 | |
108 | /* Transfer data about ourselves to the permanent link_map structure. */ | |
ee188d55 RM |
109 | _dl_rtld_map.l_addr = bootstrap_map.l_addr; |
110 | _dl_rtld_map.l_ld = bootstrap_map.l_ld; | |
111 | memcpy (_dl_rtld_map.l_info, bootstrap_map.l_info, | |
112 | sizeof _dl_rtld_map.l_info); | |
113 | _dl_setup_hash (&_dl_rtld_map); | |
86d2c878 | 114 | |
4cb20290 RM |
115 | /* Cache the DT_RPATH stored in ld.so itself; this will be |
116 | the default search path. */ | |
ee188d55 RM |
117 | _dl_rpath = (void *) (_dl_rtld_map.l_addr + |
118 | _dl_rtld_map.l_info[DT_STRTAB]->d_un.d_ptr + | |
119 | _dl_rtld_map.l_info[DT_RPATH]->d_un.d_val); | |
d66e34cd RM |
120 | |
121 | /* Call the OS-dependent function to set up life so we can do things like | |
122 | file access. It will call `dl_main' (below) to do all the real work | |
123 | of the dynamic linker, and then unwind our frame and run the user | |
124 | entry point on the same stack we entered on. */ | |
8d6468d0 | 125 | return _dl_sysdep_start (arg, &dl_main); |
d66e34cd RM |
126 | } |
127 | ||
128 | ||
129 | /* Now life is peachy; we can do all normal operations. | |
130 | On to the real work. */ | |
131 | ||
132 | void _start (void); | |
133 | ||
91f62ce6 | 134 | unsigned int _dl_skip_args; /* Nonzero if we were run directly. */ |
a1a9d215 | 135 | |
d66e34cd | 136 | static void |
266180eb RM |
137 | dl_main (const ElfW(Phdr) *phdr, |
138 | ElfW(Half) phent, | |
139 | ElfW(Addr) *user_entry) | |
d66e34cd | 140 | { |
266180eb | 141 | const ElfW(Phdr) *ph; |
efec1d0c | 142 | struct link_map *l; |
0200214b | 143 | int lazy; |
2de99474 | 144 | enum { normal, list, verify, trace } mode; |
2064087b RM |
145 | struct link_map **preloads; |
146 | unsigned int npreloads; | |
14bab8de UD |
147 | size_t file_size; |
148 | char *file; | |
d66e34cd | 149 | |
2de99474 UD |
150 | mode = getenv ("LD_TRACE_LOADED_OBJECTS") != NULL ? trace : normal; |
151 | ||
266180eb | 152 | if (*user_entry == (ElfW(Addr)) &_start) |
0200214b RM |
153 | { |
154 | /* Ho ho. We are not the program interpreter! We are the program | |
155 | itself! This means someone ran ld.so as a command. Well, that | |
156 | might be convenient to do sometimes. We support it by | |
157 | interpreting the args like this: | |
158 | ||
159 | ld.so PROGRAM ARGS... | |
160 | ||
161 | The first argument is the name of a file containing an ELF | |
162 | executable we will load and run with the following arguments. | |
163 | To simplify life here, PROGRAM is searched for using the | |
164 | normal rules for shared objects, rather than $PATH or anything | |
165 | like that. We just load it and use its entry point; we don't | |
166 | pay attention to its PT_INTERP command (we are the interpreter | |
167 | ourselves). This is an easy way to test a new ld.so before | |
168 | installing it. */ | |
169 | if (_dl_argc < 2) | |
170 | _dl_sysdep_fatal ("\ | |
61965e9b | 171 | Usage: ld.so [--list|--verify] EXECUTABLE-FILE [ARGS-FOR-PROGRAM...]\n\ |
d66e34cd RM |
172 | You have invoked `ld.so', the helper program for shared library executables.\n\ |
173 | This program usually lives in the file `/lib/ld.so', and special directives\n\ | |
174 | in executable files using ELF shared libraries tell the system's program\n\ | |
175 | loader to load the helper program from this file. This helper program loads\n\ | |
176 | the shared libraries needed by the program executable, prepares the program\n\ | |
177 | to run, and runs it. You may invoke this helper program directly from the\n\ | |
178 | command line to load and run an ELF executable file; this is like executing\n\ | |
179 | that file itself, but always uses this helper program from the file you\n\ | |
180 | specified, instead of the helper program file specified in the executable\n\ | |
181 | file you run. This is mostly of use for maintainers to test new versions\n\ | |
5bf62f2d | 182 | of this helper program; chances are you did not intend to run this program.\n", |
0200214b | 183 | NULL); |
421f82e5 | 184 | |
ffee1316 RM |
185 | /* Note the place where the dynamic linker actually came from. */ |
186 | _dl_rtld_map.l_name = _dl_argv[0]; | |
6a76c115 | 187 | |
0200214b RM |
188 | if (! strcmp (_dl_argv[1], "--list")) |
189 | { | |
61965e9b RM |
190 | mode = list; |
191 | ||
192 | ++_dl_skip_args; | |
193 | --_dl_argc; | |
194 | ++_dl_argv; | |
195 | } | |
196 | else if (! strcmp (_dl_argv[1], "--verify")) | |
197 | { | |
198 | mode = verify; | |
6a76c115 RM |
199 | |
200 | ++_dl_skip_args; | |
421f82e5 RM |
201 | --_dl_argc; |
202 | ++_dl_argv; | |
421f82e5 | 203 | } |
d66e34cd | 204 | |
0200214b RM |
205 | ++_dl_skip_args; |
206 | --_dl_argc; | |
207 | ++_dl_argv; | |
91f62ce6 | 208 | |
2de99474 UD |
209 | if (mode == verify) |
210 | { | |
211 | void doit (void) | |
212 | { | |
213 | l = _dl_map_object (NULL, _dl_argv[0], lt_library); | |
214 | } | |
dcf0671d | 215 | char *err_str = NULL; |
2de99474 UD |
216 | const char *obj_name __attribute__ ((unused)); |
217 | ||
218 | (void) _dl_catch_error (&err_str, &obj_name, doit); | |
219 | if (err_str != NULL) | |
dcf0671d UD |
220 | { |
221 | free (err_str); | |
222 | _exit (EXIT_FAILURE); | |
223 | } | |
2de99474 UD |
224 | } |
225 | else | |
226 | l = _dl_map_object (NULL, _dl_argv[0], lt_library); | |
227 | ||
0200214b RM |
228 | phdr = l->l_phdr; |
229 | phent = l->l_phnum; | |
230 | l->l_name = (char *) ""; | |
231 | *user_entry = l->l_entry; | |
232 | } | |
233 | else | |
234 | { | |
235 | /* Create a link_map for the executable itself. | |
236 | This will be what dlopen on "" returns. */ | |
2de99474 | 237 | l = _dl_new_object ((char *) "", "", lt_executable); |
0200214b RM |
238 | l->l_phdr = phdr; |
239 | l->l_phnum = phent; | |
0200214b RM |
240 | l->l_entry = *user_entry; |
241 | } | |
242 | ||
243 | if (l != _dl_loaded) | |
244 | { | |
245 | /* GDB assumes that the first element on the chain is the | |
246 | link_map for the executable itself, and always skips it. | |
247 | Make sure the first one is indeed that one. */ | |
248 | l->l_prev->l_next = l->l_next; | |
249 | if (l->l_next) | |
250 | l->l_next->l_prev = l->l_prev; | |
251 | l->l_prev = NULL; | |
252 | l->l_next = _dl_loaded; | |
253 | _dl_loaded->l_prev = l; | |
254 | _dl_loaded = l; | |
255 | } | |
256 | ||
257 | /* Scan the program header table for the dynamic section. */ | |
258 | for (ph = phdr; ph < &phdr[phent]; ++ph) | |
259 | switch (ph->p_type) | |
260 | { | |
261 | case PT_DYNAMIC: | |
262 | /* This tells us where to find the dynamic section, | |
263 | which tells us everything we need to do. */ | |
264 | l->l_ld = (void *) l->l_addr + ph->p_vaddr; | |
265 | break; | |
266 | case PT_INTERP: | |
267 | /* This "interpreter segment" was used by the program loader to | |
268 | find the program interpreter, which is this program itself, the | |
269 | dynamic linker. We note what name finds us, so that a future | |
270 | dlopen call or DT_NEEDED entry, for something that wants to link | |
271 | against the dynamic linker as a shared library, will know that | |
272 | the shared object is already loaded. */ | |
ffee1316 | 273 | _dl_rtld_map.l_libname = (const char *) l->l_addr + ph->p_vaddr; |
0200214b RM |
274 | break; |
275 | } | |
ffee1316 RM |
276 | if (! _dl_rtld_map.l_libname && _dl_rtld_map.l_name) |
277 | /* We were invoked directly, so the program might not have a PT_INTERP. */ | |
278 | _dl_rtld_map.l_libname = _dl_rtld_map.l_name; | |
279 | else | |
280 | assert (_dl_rtld_map.l_libname); /* How else did we get here? */ | |
0200214b | 281 | |
61965e9b RM |
282 | if (mode == verify) |
283 | /* We were called just to verify that this is a dynamic executable | |
284 | using us as the program interpreter. */ | |
e75154a6 RM |
285 | _exit ((strcmp (_dl_rtld_map.l_libname, _dl_rtld_map.l_name) || |
286 | l->l_ld == NULL) | |
61965e9b RM |
287 | ? EXIT_FAILURE : EXIT_SUCCESS); |
288 | ||
0200214b RM |
289 | /* Extract the contents of the dynamic section for easy access. */ |
290 | elf_get_dynamic_info (l->l_ld, l->l_info); | |
291 | if (l->l_info[DT_HASH]) | |
292 | /* Set up our cache of pointers into the hash table. */ | |
293 | _dl_setup_hash (l); | |
294 | ||
0200214b RM |
295 | /* Put the link_map for ourselves on the chain so it can be found by |
296 | name. */ | |
ffee1316 RM |
297 | if (! _dl_rtld_map.l_name) |
298 | /* If not invoked directly, the dynamic linker shared object file was | |
299 | found by the PT_INTERP name. */ | |
300 | _dl_rtld_map.l_name = (char *) _dl_rtld_map.l_libname; | |
ba79d61b | 301 | _dl_rtld_map.l_type = lt_library; |
0200214b RM |
302 | while (l->l_next) |
303 | l = l->l_next; | |
ee188d55 RM |
304 | l->l_next = &_dl_rtld_map; |
305 | _dl_rtld_map.l_prev = l; | |
0200214b | 306 | |
14bab8de UD |
307 | /* We have two ways to specify objects to preload: via environment |
308 | variable and via the file /etc/ld.so.preload. The later can also | |
309 | be used when security is enabled. */ | |
2064087b RM |
310 | preloads = NULL; |
311 | npreloads = 0; | |
14bab8de | 312 | |
c4029823 UD |
313 | if (! __libc_enable_secure) |
314 | { | |
315 | const char *preloadlist = getenv ("LD_PRELOAD"); | |
316 | if (preloadlist) | |
317 | { | |
318 | /* The LD_PRELOAD environment variable gives a colon-separated | |
319 | list of libraries that are loaded before the executable's | |
320 | dependencies and prepended to the global scope list. */ | |
321 | char *list = strdupa (preloadlist); | |
322 | char *p; | |
323 | while ((p = strsep (&list, ":")) != NULL) | |
324 | { | |
325 | (void) _dl_map_object (NULL, p, lt_library); | |
326 | ++npreloads; | |
327 | } | |
328 | } | |
329 | } | |
330 | ||
14bab8de UD |
331 | /* Read the contents of the file. */ |
332 | file = _dl_sysdep_read_whole_file ("/etc/ld.so.preload", &file_size, | |
333 | PROT_READ | PROT_WRITE); | |
334 | if (file) | |
335 | { | |
336 | /* Parse the file. It contains names of libraries to be loaded, | |
337 | separated by white spaces or `:'. It may also contain | |
338 | comments introduced by `#'. */ | |
339 | char *problem; | |
340 | char *runp; | |
341 | size_t rest; | |
342 | ||
343 | /* Eliminate comments. */ | |
344 | runp = file; | |
345 | rest = file_size; | |
346 | while (rest > 0) | |
347 | { | |
348 | char *comment = memchr (runp, '#', rest); | |
349 | if (comment == NULL) | |
350 | break; | |
351 | ||
352 | rest -= comment - runp; | |
353 | do | |
354 | *comment = ' '; | |
355 | while (--rest > 0 && *++comment != '\n'); | |
356 | } | |
357 | ||
358 | /* We have one problematic case: if we have a name at the end of | |
359 | the file without a trailing terminating characters, we cannot | |
360 | place the \0. Handle the case separately. */ | |
361 | if (file[file_size - 1] != ' ' && file[file_size] != '\t' | |
362 | && file[file_size] != '\n') | |
363 | { | |
364 | problem = &file[file_size]; | |
365 | while (problem > file && problem[-1] != ' ' && problem[-1] != '\t' | |
366 | && problem[-1] != '\n') | |
367 | --problem; | |
368 | ||
369 | if (problem > file) | |
370 | problem[-1] = '\0'; | |
371 | } | |
372 | else | |
373 | problem = NULL; | |
374 | ||
375 | if (file != problem) | |
376 | { | |
377 | char *p; | |
378 | runp = file; | |
379 | while ((p = strsep (&runp, ": \t\n")) != NULL) | |
380 | { | |
381 | (void) _dl_map_object (NULL, p, lt_library); | |
382 | ++npreloads; | |
383 | } | |
384 | } | |
385 | ||
386 | if (problem != NULL) | |
387 | { | |
388 | char *p = strndupa (problem, file_size - (problem - file)); | |
389 | (void) _dl_map_object (NULL, p, lt_library); | |
390 | } | |
391 | ||
392 | /* We don't need the file anymore. */ | |
393 | __munmap (file, file_size); | |
394 | } | |
395 | ||
14bab8de UD |
396 | if (npreloads != 0) |
397 | { | |
398 | /* Set up PRELOADS with a vector of the preloaded libraries. */ | |
399 | struct link_map *l; | |
400 | unsigned int i; | |
401 | preloads = __alloca (npreloads * sizeof preloads[0]); | |
402 | l = _dl_rtld_map.l_next; /* End of the chain before preloads. */ | |
403 | i = 0; | |
404 | do | |
405 | { | |
406 | preloads[i++] = l; | |
407 | l = l->l_next; | |
408 | } while (l); | |
409 | assert (i == npreloads); | |
410 | } | |
411 | ||
2064087b RM |
412 | /* Load all the libraries specified by DT_NEEDED entries. If LD_PRELOAD |
413 | specified some libraries to load, these are inserted before the actual | |
414 | dependencies in the executable's searchlist for symbol resolution. */ | |
415 | _dl_map_object_deps (l, preloads, npreloads); | |
d66e34cd | 416 | |
2064087b | 417 | #ifndef MAP_ANON |
f332db02 RM |
418 | /* We are done mapping things, so close the zero-fill descriptor. */ |
419 | __close (_dl_zerofd); | |
420 | _dl_zerofd = -1; | |
2064087b | 421 | #endif |
f332db02 | 422 | |
f9496a7b RM |
423 | /* Remove _dl_rtld_map from the chain. */ |
424 | _dl_rtld_map.l_prev->l_next = _dl_rtld_map.l_next; | |
425 | if (_dl_rtld_map.l_next) | |
426 | _dl_rtld_map.l_next->l_prev = _dl_rtld_map.l_prev; | |
427 | ||
428 | if (_dl_rtld_map.l_opencount) | |
0200214b | 429 | { |
f9496a7b RM |
430 | /* Some DT_NEEDED entry referred to the interpreter object itself, so |
431 | put it back in the list of visible objects. We insert it into the | |
432 | chain in symbol search order because gdb uses the chain's order as | |
433 | its symbol search order. */ | |
434 | unsigned int i = 1; | |
435 | while (l->l_searchlist[i] != &_dl_rtld_map) | |
436 | ++i; | |
437 | _dl_rtld_map.l_prev = l->l_searchlist[i - 1]; | |
438 | _dl_rtld_map.l_next = (i + 1 < l->l_nsearchlist ? | |
439 | l->l_searchlist[i + 1] : NULL); | |
440 | assert (_dl_rtld_map.l_prev->l_next == _dl_rtld_map.l_next); | |
441 | _dl_rtld_map.l_prev->l_next = &_dl_rtld_map; | |
4d02a5b1 | 442 | if (_dl_rtld_map.l_next) |
f9496a7b RM |
443 | { |
444 | assert (_dl_rtld_map.l_next->l_prev == _dl_rtld_map.l_prev); | |
445 | _dl_rtld_map.l_next->l_prev = &_dl_rtld_map; | |
446 | } | |
0200214b | 447 | } |
d66e34cd | 448 | |
2de99474 | 449 | if (mode != normal) |
0200214b RM |
450 | { |
451 | /* We were run just to list the shared libraries. It is | |
452 | important that we do this before real relocation, because the | |
453 | functions we call below for output may no longer work properly | |
454 | after relocation. */ | |
1a3a58fd | 455 | |
0200214b | 456 | int i; |
fd861379 | 457 | |
0200214b RM |
458 | if (! _dl_loaded->l_info[DT_NEEDED]) |
459 | _dl_sysdep_message ("\t", "statically linked\n", NULL); | |
460 | else | |
461 | for (l = _dl_loaded->l_next; l; l = l->l_next) | |
462 | { | |
463 | char buf[20], *bp; | |
464 | buf[sizeof buf - 1] = '\0'; | |
465 | bp = _itoa (l->l_addr, &buf[sizeof buf - 1], 16, 0); | |
14bab8de | 466 | while ((size_t) (&buf[sizeof buf - 1] - bp) < sizeof l->l_addr * 2) |
0200214b RM |
467 | *--bp = '0'; |
468 | _dl_sysdep_message ("\t", l->l_libname, " => ", l->l_name, | |
469 | " (0x", bp, ")\n", NULL); | |
470 | } | |
1a3a58fd | 471 | |
2de99474 | 472 | if (mode != trace) |
cddcfecf RM |
473 | for (i = 1; i < _dl_argc; ++i) |
474 | { | |
475 | const ElfW(Sym) *ref = NULL; | |
476 | ElfW(Addr) loadbase = _dl_lookup_symbol (_dl_argv[i], &ref, | |
477 | &_dl_default_scope[2], | |
dcf0671d UD |
478 | "argument", |
479 | DL_LOOKUP_NOPLT); | |
cddcfecf RM |
480 | char buf[20], *bp; |
481 | buf[sizeof buf - 1] = '\0'; | |
482 | bp = _itoa (ref->st_value, &buf[sizeof buf - 1], 16, 0); | |
14bab8de | 483 | while ((size_t) (&buf[sizeof buf - 1] - bp) < sizeof loadbase * 2) |
cddcfecf RM |
484 | *--bp = '0'; |
485 | _dl_sysdep_message (_dl_argv[i], " found at 0x", bp, NULL); | |
486 | buf[sizeof buf - 1] = '\0'; | |
487 | bp = _itoa (loadbase, &buf[sizeof buf - 1], 16, 0); | |
14bab8de | 488 | while ((size_t) (&buf[sizeof buf - 1] - bp) < sizeof loadbase * 2) |
cddcfecf RM |
489 | *--bp = '0'; |
490 | _dl_sysdep_message (" in object at 0x", bp, "\n", NULL); | |
491 | } | |
d66e34cd | 492 | |
0200214b RM |
493 | _exit (0); |
494 | } | |
86d2c878 | 495 | |
cddcfecf | 496 | lazy = !__libc_enable_secure && *(getenv ("LD_BIND_NOW") ?: "") == '\0'; |
0200214b | 497 | |
ba79d61b RM |
498 | { |
499 | /* Now we have all the objects loaded. Relocate them all except for | |
500 | the dynamic linker itself. We do this in reverse order so that copy | |
501 | relocs of earlier objects overwrite the data written by later | |
502 | objects. We do not re-relocate the dynamic linker itself in this | |
503 | loop because that could result in the GOT entries for functions we | |
504 | call being changed, and that would break us. It is safe to relocate | |
505 | the dynamic linker out of order because it has no copy relocs (we | |
506 | know that because it is self-contained). */ | |
507 | ||
508 | l = _dl_loaded; | |
509 | while (l->l_next) | |
510 | l = l->l_next; | |
511 | do | |
512 | { | |
513 | if (l != &_dl_rtld_map) | |
514 | { | |
515 | _dl_relocate_object (l, _dl_object_relocation_scope (l), lazy); | |
516 | *_dl_global_scope_end = NULL; | |
517 | } | |
518 | l = l->l_prev; | |
519 | } while (l); | |
520 | ||
521 | /* Do any necessary cleanups for the startup OS interface code. | |
522 | We do these now so that no calls are made after rtld re-relocation | |
523 | which might be resolved to different functions than we expect. | |
524 | We cannot do this before relocating the other objects because | |
525 | _dl_relocate_object might need to call `mprotect' for DT_TEXTREL. */ | |
526 | _dl_sysdep_start_cleanup (); | |
527 | ||
528 | if (_dl_rtld_map.l_opencount > 0) | |
529 | /* There was an explicit ref to the dynamic linker as a shared lib. | |
530 | Re-relocate ourselves with user-controlled symbol definitions. */ | |
531 | _dl_relocate_object (&_dl_rtld_map, &_dl_default_scope[2], 0); | |
532 | } | |
0200214b | 533 | |
4d6acc61 RM |
534 | { |
535 | /* Initialize _r_debug. */ | |
536 | struct r_debug *r = _dl_debug_initialize (_dl_rtld_map.l_addr); | |
537 | ||
538 | l = _dl_loaded; | |
ec42724d RM |
539 | |
540 | #ifdef ELF_MACHINE_DEBUG_SETUP | |
541 | ||
542 | /* Some machines (e.g. MIPS) don't use DT_DEBUG in this way. */ | |
543 | ||
544 | ELF_MACHINE_DEBUG_SETUP (l, r); | |
545 | ELF_MACHINE_DEBUG_SETUP (&_dl_rtld_map, r); | |
546 | ||
547 | #else | |
548 | ||
4d6acc61 RM |
549 | if (l->l_info[DT_DEBUG]) |
550 | /* There is a DT_DEBUG entry in the dynamic section. Fill it in | |
551 | with the run-time address of the r_debug structure */ | |
552 | l->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
553 | ||
d746b89c RM |
554 | /* Fill in the pointer in the dynamic linker's own dynamic section, in |
555 | case you run gdb on the dynamic linker directly. */ | |
556 | if (_dl_rtld_map.l_info[DT_DEBUG]) | |
557 | _dl_rtld_map.l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r; | |
558 | ||
ec42724d RM |
559 | #endif |
560 | ||
4d6acc61 RM |
561 | /* Notify the debugger that all objects are now mapped in. */ |
562 | r->r_state = RT_ADD; | |
563 | _dl_debug_state (); | |
564 | } | |
0200214b | 565 | |
39778c6c UD |
566 | /* We finished the intialization and will start up. */ |
567 | _dl_starting_up = 1; | |
568 | ||
d66e34cd RM |
569 | /* Once we return, _dl_sysdep_start will invoke |
570 | the DT_INIT functions and then *USER_ENTRY. */ | |
571 | } |