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a42195db | 1 | /* Run-time dynamic linker data structures for loaded ELF shared objects. |
d4697bc9 | 2 | Copyright (C) 1995-2014 Free Software Foundation, Inc. |
a42195db UD |
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 | |
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. | |
a42195db UD |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
a42195db | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
a42195db UD |
18 | |
19 | #ifndef _LDSODEFS_H | |
20 | #define _LDSODEFS_H 1 | |
21 | ||
22 | #include <features.h> | |
23 | ||
3fb55878 | 24 | #include <stdbool.h> |
a42195db UD |
25 | #define __need_size_t |
26 | #define __need_NULL | |
27 | #include <stddef.h> | |
ef52edfc | 28 | #include <string.h> |
e054f494 | 29 | #include <stdint.h> |
a42195db UD |
30 | |
31 | #include <elf.h> | |
32 | #include <dlfcn.h> | |
5688da55 | 33 | #include <fpu_control.h> |
d6b5d570 | 34 | #include <sys/mman.h> |
a42195db | 35 | #include <link.h> |
c0282c06 | 36 | #include <dl-lookupcfg.h> |
ce460d04 | 37 | #include <dl-sysdep.h> |
c12aa801 | 38 | #include <bits/libc-lock.h> |
5688da55 | 39 | #include <hp-timing.h> |
535b764d | 40 | #include <tls.h> |
a42195db UD |
41 | |
42 | __BEGIN_DECLS | |
43 | ||
9bac1d86 L |
44 | #define VERSYMIDX(sym) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (sym)) |
45 | #define VALIDX(tag) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM \ | |
46 | + DT_EXTRANUM + DT_VALTAGIDX (tag)) | |
47 | #define ADDRIDX(tag) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM \ | |
48 | + DT_EXTRANUM + DT_VALNUM + DT_ADDRTAGIDX (tag)) | |
49 | ||
a42195db UD |
50 | /* We use this macro to refer to ELF types independent of the native wordsize. |
51 | `ElfW(TYPE)' is used in place of `Elf32_TYPE' or `Elf64_TYPE'. */ | |
52 | #define ELFW(type) _ElfW (ELF, __ELF_NATIVE_CLASS, type) | |
53 | ||
54 | /* All references to the value of l_info[DT_PLTGOT], | |
55 | l_info[DT_STRTAB], l_info[DT_SYMTAB], l_info[DT_RELA], | |
88fdf42f | 56 | l_info[DT_REL], l_info[DT_JMPREL], and l_info[VERSYMIDX (DT_VERSYM)] |
42ba2c11 | 57 | have to be accessed via the D_PTR macro. The macro is needed since for |
88fdf42f AJ |
58 | most architectures the entry is already relocated - but for some not |
59 | and we need to relocate at access time. */ | |
a42195db | 60 | #ifdef DL_RO_DYN_SECTION |
9dcafc55 | 61 | # define D_PTR(map, i) ((map)->i->d_un.d_ptr + (map)->l_addr) |
a42195db | 62 | #else |
9dcafc55 | 63 | # define D_PTR(map, i) (map)->i->d_un.d_ptr |
a42195db UD |
64 | #endif |
65 | ||
9dcafc55 | 66 | /* Result of the lookup functions and how to retrieve the base address. */ |
c0282c06 | 67 | typedef struct link_map *lookup_t; |
93b53ca2 UD |
68 | #define LOOKUP_VALUE(map) map |
69 | #define LOOKUP_VALUE_ADDRESS(map) ((map) ? (map)->l_addr : 0) | |
c0282c06 | 70 | |
0b3cf801 | 71 | /* On some architectures a pointer to a function is not just a pointer |
c0282c06 UD |
72 | to the actual code of the function but rather an architecture |
73 | specific descriptor. */ | |
74 | #ifndef ELF_FUNCTION_PTR_IS_SPECIAL | |
09bf6406 | 75 | # define DL_SYMBOL_ADDRESS(map, ref) \ |
c0282c06 | 76 | (void *) (LOOKUP_VALUE_ADDRESS (map) + ref->st_value) |
09bf6406 | 77 | # define DL_LOOKUP_ADDRESS(addr) ((ElfW(Addr)) (addr)) |
daf75146 GM |
78 | # define DL_CALL_DT_INIT(map, start, argc, argv, env) \ |
79 | ((init_t) (start)) (argc, argv, env) | |
80 | # define DL_CALL_DT_FINI(map, start) ((fini_t) (start)) () | |
09bf6406 UD |
81 | #endif |
82 | ||
0b3cf801 UD |
83 | /* On some architectures dladdr can't use st_size of all symbols this way. */ |
84 | #define DL_ADDR_SYM_MATCH(L, SYM, MATCHSYM, ADDR) \ | |
85 | ((ADDR) >= (L)->l_addr + (SYM)->st_value \ | |
2ac9ca73 | 86 | && ((((SYM)->st_shndx == SHN_UNDEF || (SYM)->st_size == 0) \ |
0b3cf801 UD |
87 | && (ADDR) == (L)->l_addr + (SYM)->st_value) \ |
88 | || (ADDR) < (L)->l_addr + (SYM)->st_value + (SYM)->st_size) \ | |
89 | && ((MATCHSYM) == NULL || (MATCHSYM)->st_value < (SYM)->st_value)) | |
90 | ||
09bf6406 UD |
91 | /* Unmap a loaded object, called by _dl_close (). */ |
92 | #ifndef DL_UNMAP_IS_SPECIAL | |
fcccd512 | 93 | # define DL_UNMAP(map) _dl_unmap_segments (map) |
c0282c06 UD |
94 | #endif |
95 | ||
beb5387c UD |
96 | /* By default we do not need special support to initialize DSOs loaded |
97 | by statically linked binaries. */ | |
98 | #ifndef DL_STATIC_INIT | |
99 | # define DL_STATIC_INIT(map) | |
100 | #endif | |
101 | ||
cf5a372e UD |
102 | /* Reloc type classes as returned by elf_machine_type_class(). |
103 | ELF_RTYPE_CLASS_PLT means this reloc should not be satisfied by | |
104 | some PLT symbol, ELF_RTYPE_CLASS_COPY means this reloc should not be | |
18ef464b UD |
105 | satisfied by any symbol in the executable. Some architectures do |
106 | not support copy relocations. In this case we define the macro to | |
107 | zero so that the code for handling them gets automatically optimized | |
108 | out. */ | |
cf5a372e | 109 | #define ELF_RTYPE_CLASS_PLT 1 |
18ef464b UD |
110 | #ifndef DL_NO_COPY_RELOCS |
111 | # define ELF_RTYPE_CLASS_COPY 2 | |
112 | #else | |
113 | # define ELF_RTYPE_CLASS_COPY 0 | |
114 | #endif | |
cf5a372e | 115 | |
9d63abbc UD |
116 | /* ELF uses the PF_x macros to specify the segment permissions, mmap |
117 | uses PROT_xxx. In most cases the three macros have the values 1, 2, | |
118 | and 3 but not in a matching order. The following macros allows | |
119 | converting from the PF_x values to PROT_xxx values. */ | |
120 | #define PF_TO_PROT \ | |
121 | ((PROT_READ << (PF_R * 4)) \ | |
122 | | (PROT_WRITE << (PF_W * 4)) \ | |
123 | | (PROT_EXEC << (PF_X * 4)) \ | |
124 | | ((PROT_READ | PROT_WRITE) << ((PF_R | PF_W) * 4)) \ | |
125 | | ((PROT_READ | PROT_EXEC) << ((PF_R | PF_X) * 4)) \ | |
126 | | ((PROT_WRITE | PROT_EXEC) << (PF_W | PF_X) * 4) \ | |
127 | | ((PROT_READ | PROT_WRITE | PROT_EXEC) << ((PF_R | PF_W | PF_X) * 4))) | |
128 | ||
b9375348 SP |
129 | /* The filename itself, or the main program name, if available. */ |
130 | #define DSO_FILENAME(name) ((name)[0] ? (name) \ | |
131 | : (rtld_progname ?: "<main program>")) | |
132 | ||
133 | #define RTLD_PROGNAME (rtld_progname ?: "<program name unknown>") | |
9d63abbc | 134 | |
a42195db UD |
135 | /* For the version handling we need an array with only names and their |
136 | hash values. */ | |
137 | struct r_found_version | |
138 | { | |
139 | const char *name; | |
140 | ElfW(Word) hash; | |
141 | ||
142 | int hidden; | |
143 | const char *filename; | |
144 | }; | |
145 | ||
146 | /* We want to cache information about the searches for shared objects. */ | |
147 | ||
148 | enum r_dir_status { unknown, nonexisting, existing }; | |
149 | ||
150 | struct r_search_path_elem | |
151 | { | |
152 | /* This link is only used in the `all_dirs' member of `r_search_path'. */ | |
153 | struct r_search_path_elem *next; | |
154 | ||
155 | /* Strings saying where the definition came from. */ | |
156 | const char *what; | |
157 | const char *where; | |
158 | ||
159 | /* Basename for this search path element. The string must end with | |
160 | a slash character. */ | |
161 | const char *dirname; | |
162 | size_t dirnamelen; | |
163 | ||
164 | enum r_dir_status status[0]; | |
165 | }; | |
166 | ||
167 | struct r_strlenpair | |
168 | { | |
169 | const char *str; | |
170 | size_t len; | |
171 | }; | |
172 | ||
173 | ||
174 | /* A data structure for a simple single linked list of strings. */ | |
175 | struct libname_list | |
176 | { | |
177 | const char *name; /* Name requested (before search). */ | |
178 | struct libname_list *next; /* Link to next name for this object. */ | |
752a2a50 UD |
179 | int dont_free; /* Flag whether this element should be freed |
180 | if the object is not entirely unloaded. */ | |
a42195db UD |
181 | }; |
182 | ||
183 | ||
eec8b6ca UD |
184 | /* Bit masks for the objects which valid callers can come from to |
185 | functions with restricted interface. */ | |
186 | enum allowmask | |
187 | { | |
188 | allow_libc = 1, | |
189 | allow_libdl = 2, | |
190 | allow_libpthread = 4, | |
191 | allow_ldso = 8 | |
192 | }; | |
193 | ||
194 | ||
9dcafc55 UD |
195 | struct audit_ifaces |
196 | { | |
197 | void (*activity) (uintptr_t *, unsigned int); | |
198 | char *(*objsearch) (const char *, uintptr_t *, unsigned int); | |
199 | unsigned int (*objopen) (struct link_map *, Lmid_t, uintptr_t *); | |
200 | void (*preinit) (uintptr_t *); | |
201 | union | |
202 | { | |
203 | uintptr_t (*symbind32) (Elf32_Sym *, unsigned int, uintptr_t *, | |
204 | uintptr_t *, unsigned int *, const char *); | |
205 | uintptr_t (*symbind64) (Elf64_Sym *, unsigned int, uintptr_t *, | |
206 | uintptr_t *, unsigned int *, const char *); | |
207 | }; | |
208 | union | |
209 | { | |
dc936e2b RM |
210 | #ifdef ARCH_PLTENTER_MEMBERS |
211 | ARCH_PLTENTER_MEMBERS; | |
212 | #endif | |
9dcafc55 UD |
213 | }; |
214 | union | |
215 | { | |
dc936e2b RM |
216 | #ifdef ARCH_PLTEXIT_MEMBERS |
217 | ARCH_PLTEXIT_MEMBERS; | |
218 | #endif | |
9dcafc55 UD |
219 | }; |
220 | unsigned int (*objclose) (uintptr_t *); | |
221 | ||
222 | struct audit_ifaces *next; | |
223 | }; | |
224 | ||
225 | ||
a42195db | 226 | /* Test whether given NAME matches any of the names of the given object. */ |
871b9158 | 227 | extern int _dl_name_match_p (const char *__name, const struct link_map *__map) |
dd272e57 | 228 | internal_function; |
a42195db | 229 | |
55c4ce68 UD |
230 | /* Compute next higher prime number. */ |
231 | extern unsigned long int _dl_higher_prime_number (unsigned long int n) | |
232 | internal_function; | |
233 | ||
a42195db UD |
234 | /* Function used as argument for `_dl_receive_error' function. The |
235 | arguments are the error code, error string, and the objname the | |
236 | error occurred in. */ | |
237 | typedef void (*receiver_fct) (int, const char *, const char *); | |
238 | \f | |
239 | /* Internal functions of the run-time dynamic linker. | |
240 | These can be accessed if you link again the dynamic linker | |
241 | as a shared library, as in `-lld' or `/lib/ld.so' explicitly; | |
242 | but are not normally of interest to user programs. | |
243 | ||
244 | The `-ldl' library functions in <dlfcn.h> provide a simple | |
245 | user interface to run-time dynamic linking. */ | |
246 | ||
247 | ||
d6b5d570 UD |
248 | #ifndef SHARED |
249 | # define EXTERN extern | |
250 | # define GL(name) _##name | |
251 | #else | |
252 | # define EXTERN | |
403e0597 | 253 | # ifdef IS_IN_rtld |
0d01dace UD |
254 | # define GL(name) _rtld_local._##name |
255 | # else | |
256 | # define GL(name) _rtld_global._##name | |
257 | # endif | |
d6b5d570 UD |
258 | struct rtld_global |
259 | { | |
260 | #endif | |
261 | /* Don't change the order of the following elements. 'dl_loaded' | |
262 | must remain the first element. Forever. */ | |
263 | ||
c0f62c56 UD |
264 | /* Non-shared code has no support for multiple namespaces. */ |
265 | #ifdef SHARED | |
266 | # define DL_NNS 16 | |
267 | #else | |
268 | # define DL_NNS 1 | |
269 | #endif | |
270 | EXTERN struct link_namespaces | |
271 | { | |
9dcafc55 | 272 | /* A pointer to the map for the main map. */ |
c0f62c56 UD |
273 | struct link_map *_ns_loaded; |
274 | /* Number of object in the _dl_loaded list. */ | |
275 | unsigned int _ns_nloaded; | |
c0f62c56 UD |
276 | /* Direct pointer to the searchlist of the main object. */ |
277 | struct r_scope_elem *_ns_main_searchlist; | |
278 | /* This is zero at program start to signal that the global scope map is | |
279 | allocated by rtld. Later it keeps the size of the map. It might be | |
280 | reset if in _dl_close if the last global object is removed. */ | |
281 | size_t _ns_global_scope_alloc; | |
415ac3df UD |
282 | /* Search table for unique objects. */ |
283 | struct unique_sym_table | |
284 | { | |
bea9b193 | 285 | __rtld_lock_define_recursive (, lock) |
415ac3df UD |
286 | struct unique_sym |
287 | { | |
288 | uint32_t hashval; | |
289 | const char *name; | |
290 | const ElfW(Sym) *sym; | |
5e4287d1 | 291 | const struct link_map *map; |
415ac3df UD |
292 | } *entries; |
293 | size_t size; | |
294 | size_t n_elements; | |
295 | void (*free) (void *); | |
296 | } _ns_unique_sym_table; | |
29f97654 UD |
297 | /* Keep track of changes to each namespace' list. */ |
298 | struct r_debug _ns_debug; | |
c0f62c56 | 299 | } _dl_ns[DL_NNS]; |
22c83193 UD |
300 | /* One higher than index of last used namespace. */ |
301 | EXTERN size_t _dl_nns; | |
d6b5d570 | 302 | |
5688da55 UD |
303 | /* During the program run we must not modify the global data of |
304 | loaded shared object simultanously in two threads. Therefore we | |
305 | protect `_dl_open' and `_dl_close' in dl-close.c. | |
306 | ||
307 | This must be a recursive lock since the initializer function of | |
308 | the loaded object might as well require a call to this function. | |
309 | At this time it is not anymore a problem to modify the tables. */ | |
d3c9f895 | 310 | __rtld_lock_define_recursive (EXTERN, _dl_load_lock) |
5a2a1d75 AS |
311 | /* This lock is used to keep __dl_iterate_phdr from inspecting the |
312 | list of loaded objects while an object is added to or removed | |
313 | from that list. */ | |
314 | __rtld_lock_define_recursive (EXTERN, _dl_load_write_lock) | |
5688da55 | 315 | |
bed12f78 UD |
316 | /* Incremented whenever something may have been added to dl_loaded. */ |
317 | EXTERN unsigned long long _dl_load_adds; | |
bed12f78 | 318 | |
d6b5d570 UD |
319 | /* The object to be initialized first. */ |
320 | EXTERN struct link_map *_dl_initfirst; | |
321 | ||
8c682bb2 | 322 | #if HP_SMALL_TIMING_AVAIL |
ccdf0cab | 323 | /* Start time on CPU clock. */ |
5688da55 UD |
324 | EXTERN hp_timing_t _dl_cpuclock_offset; |
325 | #endif | |
326 | ||
d6b5d570 UD |
327 | /* Map of shared object to be profiled. */ |
328 | EXTERN struct link_map *_dl_profile_map; | |
d6b5d570 UD |
329 | |
330 | /* Counters for the number of relocations performed. */ | |
331 | EXTERN unsigned long int _dl_num_relocations; | |
332 | EXTERN unsigned long int _dl_num_cache_relocations; | |
333 | ||
d6b5d570 UD |
334 | /* List of search directories. */ |
335 | EXTERN struct r_search_path_elem *_dl_all_dirs; | |
d6b5d570 | 336 | |
68dc80ca RM |
337 | #ifdef _LIBC_REENTRANT |
338 | EXTERN void **(*_dl_error_catch_tsd) (void) __attribute__ ((const)); | |
339 | #endif | |
340 | ||
9dcafc55 UD |
341 | /* Structure describing the dynamic linker itself. We need to |
342 | reserve memory for the data the audit libraries need. */ | |
d6b5d570 | 343 | EXTERN struct link_map _dl_rtld_map; |
9dcafc55 UD |
344 | #ifdef SHARED |
345 | struct auditstate audit_data[DL_NNS]; | |
346 | #endif | |
ce460d04 | 347 | |
334fcf2a UD |
348 | #if defined SHARED && defined _LIBC_REENTRANT \ |
349 | && defined __rtld_lock_default_lock_recursive | |
350 | EXTERN void (*_dl_rtld_lock_recursive) (void *); | |
351 | EXTERN void (*_dl_rtld_unlock_recursive) (void *); | |
352 | #endif | |
353 | ||
ecdeaac0 RM |
354 | /* If loading a shared object requires that we make the stack executable |
355 | when it was not, we do it by calling this function. | |
356 | It returns an errno code or zero on success. */ | |
d1fc817e | 357 | EXTERN int (*_dl_make_stack_executable_hook) (void **) internal_function; |
ecdeaac0 | 358 | |
9be09e06 UD |
359 | /* Prevailing state of the stack, PF_X indicating it's executable. */ |
360 | EXTERN ElfW(Word) _dl_stack_flags; | |
361 | ||
11bf311e UD |
362 | /* Flag signalling whether there are gaps in the module ID allocation. */ |
363 | EXTERN bool _dl_tls_dtv_gaps; | |
9be09e06 UD |
364 | /* Highest dtv index currently needed. */ |
365 | EXTERN size_t _dl_tls_max_dtv_idx; | |
68dc80ca RM |
366 | /* Information about the dtv slots. */ |
367 | EXTERN struct dtv_slotinfo_list | |
368 | { | |
369 | size_t len; | |
370 | struct dtv_slotinfo_list *next; | |
371 | struct dtv_slotinfo | |
372 | { | |
373 | size_t gen; | |
374 | struct link_map *map; | |
375 | } slotinfo[0]; | |
376 | } *_dl_tls_dtv_slotinfo_list; | |
377 | /* Number of modules in the static TLS block. */ | |
378 | EXTERN size_t _dl_tls_static_nelem; | |
379 | /* Size of the static TLS block. */ | |
380 | EXTERN size_t _dl_tls_static_size; | |
381 | /* Size actually allocated in the static TLS block. */ | |
382 | EXTERN size_t _dl_tls_static_used; | |
383 | /* Alignment requirement of the static TLS block. */ | |
384 | EXTERN size_t _dl_tls_static_align; | |
385 | ||
386 | /* Number of additional entries in the slotinfo array of each slotinfo | |
387 | list element. A large number makes it almost certain take we never | |
388 | have to iterate beyond the first element in the slotinfo list. */ | |
11bf311e | 389 | #define TLS_SLOTINFO_SURPLUS (62) |
68dc80ca RM |
390 | |
391 | /* Number of additional slots in the dtv allocated. */ | |
11bf311e | 392 | #define DTV_SURPLUS (14) |
68dc80ca RM |
393 | |
394 | /* Initial dtv of the main thread, not allocated with normal malloc. */ | |
395 | EXTERN void *_dl_initial_dtv; | |
396 | /* Generation counter for the dtv. */ | |
397 | EXTERN size_t _dl_tls_generation; | |
adc12574 UD |
398 | |
399 | EXTERN void (*_dl_init_static_tls) (struct link_map *); | |
68dc80ca | 400 | |
df94b641 UD |
401 | EXTERN void (*_dl_wait_lookup_done) (void); |
402 | ||
e4eb675d UD |
403 | /* Scopes to free after next THREAD_GSCOPE_WAIT (). */ |
404 | EXTERN struct dl_scope_free_list | |
405 | { | |
406 | size_t count; | |
385b4cf4 | 407 | void *list[50]; |
e4eb675d | 408 | } *_dl_scope_free_list; |
d6b5d570 UD |
409 | #ifdef SHARED |
410 | }; | |
5fe14d96 | 411 | # define __rtld_global_attribute__ |
403e0597 | 412 | # ifdef IS_IN_rtld |
11bf311e UD |
413 | # ifdef HAVE_SDATA_SECTION |
414 | # define __rtld_local_attribute__ \ | |
0d01dace | 415 | __attribute__ ((visibility ("hidden"), section (".sdata"))) |
11bf311e UD |
416 | # undef __rtld_global_attribute__ |
417 | # define __rtld_global_attribute__ __attribute__ ((section (".sdata"))) | |
0d01dace | 418 | # else |
11bf311e | 419 | # define __rtld_local_attribute__ __attribute__ ((visibility ("hidden"))) |
0d01dace UD |
420 | # endif |
421 | extern struct rtld_global _rtld_local __rtld_local_attribute__; | |
021723ab | 422 | # undef __rtld_local_attribute__ |
0d01dace | 423 | # endif |
5fe14d96 | 424 | extern struct rtld_global _rtld_global __rtld_global_attribute__; |
021723ab | 425 | # undef __rtld_global_attribute__ |
d6b5d570 | 426 | #endif |
20c37dfd UD |
427 | |
428 | #ifndef SHARED | |
429 | # define GLRO(name) _##name | |
430 | #else | |
431 | # ifdef IS_IN_rtld | |
432 | # define GLRO(name) _rtld_local_ro._##name | |
433 | # else | |
434 | # define GLRO(name) _rtld_global_ro._##name | |
435 | # endif | |
436 | struct rtld_global_ro | |
437 | { | |
438 | #endif | |
439 | ||
440 | /* If nonzero the appropriate debug information is printed. */ | |
441 | EXTERN int _dl_debug_mask; | |
442 | #define DL_DEBUG_LIBS (1 << 0) | |
443 | #define DL_DEBUG_IMPCALLS (1 << 1) | |
444 | #define DL_DEBUG_BINDINGS (1 << 2) | |
445 | #define DL_DEBUG_SYMBOLS (1 << 3) | |
446 | #define DL_DEBUG_VERSIONS (1 << 4) | |
447 | #define DL_DEBUG_RELOC (1 << 5) | |
448 | #define DL_DEBUG_FILES (1 << 6) | |
449 | #define DL_DEBUG_STATISTICS (1 << 7) | |
7a11603d | 450 | #define DL_DEBUG_UNUSED (1 << 8) |
73d7af4f | 451 | #define DL_DEBUG_SCOPES (1 << 9) |
20c37dfd | 452 | /* These two are used only internally. */ |
73d7af4f UD |
453 | #define DL_DEBUG_HELP (1 << 10) |
454 | #define DL_DEBUG_PRELINK (1 << 11) | |
20c37dfd | 455 | |
20c37dfd UD |
456 | /* OS version. */ |
457 | EXTERN unsigned int _dl_osversion; | |
458 | /* Platform name. */ | |
459 | EXTERN const char *_dl_platform; | |
460 | EXTERN size_t _dl_platformlen; | |
461 | ||
9be09e06 UD |
462 | /* Cached value of `getpagesize ()'. */ |
463 | EXTERN size_t _dl_pagesize; | |
464 | ||
73d65cc3 SP |
465 | /* Do we read from ld.so.cache? */ |
466 | EXTERN int _dl_inhibit_cache; | |
467 | ||
c31e278f UD |
468 | /* Copy of the content of `_dl_main_searchlist' at startup time. */ |
469 | EXTERN struct r_scope_elem _dl_initial_searchlist; | |
470 | ||
20c37dfd UD |
471 | /* CLK_TCK as reported by the kernel. */ |
472 | EXTERN int _dl_clktck; | |
473 | ||
474 | /* If nonzero print warnings messages. */ | |
475 | EXTERN int _dl_verbose; | |
476 | ||
dd70526e UD |
477 | /* File descriptor to write debug messages to. */ |
478 | EXTERN int _dl_debug_fd; | |
479 | ||
20c37dfd UD |
480 | /* Do we do lazy relocations? */ |
481 | EXTERN int _dl_lazy; | |
482 | ||
483 | /* Nonzero if runtime lookups should not update the .got/.plt. */ | |
484 | EXTERN int _dl_bind_not; | |
485 | ||
486 | /* Nonzero if references should be treated as weak during runtime | |
487 | linking. */ | |
488 | EXTERN int _dl_dynamic_weak; | |
489 | ||
490 | /* Default floating-point control word. */ | |
491 | EXTERN fpu_control_t _dl_fpu_control; | |
492 | ||
493 | /* Expected cache ID. */ | |
494 | EXTERN int _dl_correct_cache_id; | |
495 | ||
496 | /* Mask for hardware capabilities that are available. */ | |
404a4e2f | 497 | EXTERN uint64_t _dl_hwcap; |
20c37dfd UD |
498 | |
499 | /* Mask for important hardware capabilities we honour. */ | |
404a4e2f | 500 | EXTERN uint64_t _dl_hwcap_mask; |
20c37dfd | 501 | |
c7683a6d RH |
502 | /* Pointer to the auxv list supplied to the program at startup. */ |
503 | EXTERN ElfW(auxv_t) *_dl_auxv; | |
504 | ||
c31e278f UD |
505 | /* Get architecture specific definitions. */ |
506 | #define PROCINFO_DECL | |
ee600e3f UD |
507 | #ifndef PROCINFO_CLASS |
508 | # define PROCINFO_CLASS EXTERN | |
509 | #endif | |
c31e278f UD |
510 | #include <dl-procinfo.c> |
511 | ||
20c37dfd UD |
512 | /* Names of shared object for which the RPATH should be ignored. */ |
513 | EXTERN const char *_dl_inhibit_rpath; | |
514 | ||
515 | /* Location of the binary. */ | |
516 | EXTERN const char *_dl_origin_path; | |
517 | ||
518 | /* -1 if the dynamic linker should honor library load bias, | |
519 | 0 if not, -2 use the default (honor biases for normal | |
520 | binaries, don't honor for PIEs). */ | |
521 | EXTERN ElfW(Addr) _dl_use_load_bias; | |
522 | ||
523 | /* Name of the shared object to be profiled (if any). */ | |
524 | EXTERN const char *_dl_profile; | |
525 | /* Filename of the output file. */ | |
526 | EXTERN const char *_dl_profile_output; | |
527 | /* Name of the object we want to trace the prelinking. */ | |
528 | EXTERN const char *_dl_trace_prelink; | |
529 | /* Map of shared object to be prelink traced. */ | |
530 | EXTERN struct link_map *_dl_trace_prelink_map; | |
c31e278f UD |
531 | |
532 | /* All search directories defined at startup. */ | |
533 | EXTERN struct r_search_path_elem *_dl_init_all_dirs; | |
534 | ||
20c37dfd UD |
535 | #ifdef NEED_DL_SYSINFO |
536 | /* Syscall handling improvements. This is very specific to x86. */ | |
537 | EXTERN uintptr_t _dl_sysinfo; | |
30e32d23 | 538 | #endif |
20c37dfd | 539 | |
7775448e | 540 | #ifdef NEED_DL_SYSINFO_DSO |
20c37dfd UD |
541 | /* The vsyscall page is a virtual DSO pre-mapped by the kernel. |
542 | This points to its ELF header. */ | |
543 | EXTERN const ElfW(Ehdr) *_dl_sysinfo_dso; | |
404a4e2f RM |
544 | |
545 | /* At startup time we set up the normal DSO data structure for it, | |
546 | and this points to it. */ | |
547 | EXTERN struct link_map *_dl_sysinfo_map; | |
20c37dfd UD |
548 | #endif |
549 | ||
1ae8bfe0 RA |
550 | /* Mask for more hardware capabilities that are available on some |
551 | platforms. */ | |
552 | EXTERN uint64_t _dl_hwcap2; | |
553 | ||
20c37dfd | 554 | #ifdef SHARED |
154d10bd UD |
555 | /* We add a function table to _rtld_global which is then used to |
556 | call the function instead of going through the PLT. The result | |
557 | is that we can avoid exporting the functions and we do not jump | |
558 | PLT relocations in libc.so. */ | |
154d10bd UD |
559 | void (*_dl_debug_printf) (const char *, ...) |
560 | __attribute__ ((__format__ (__printf__, 1, 2))); | |
561 | int (internal_function *_dl_catch_error) (const char **, const char **, | |
6dffebd8 | 562 | bool *, void (*) (void *), void *); |
154d10bd UD |
563 | void (internal_function *_dl_signal_error) (int, const char *, const char *, |
564 | const char *); | |
154d10bd | 565 | void (*_dl_mcount) (ElfW(Addr) frompc, ElfW(Addr) selfpc); |
021723ab UD |
566 | lookup_t (internal_function *_dl_lookup_symbol_x) (const char *, |
567 | struct link_map *, | |
568 | const ElfW(Sym) **, | |
569 | struct r_scope_elem *[], | |
570 | const struct r_found_version *, | |
571 | int, int, | |
572 | struct link_map *); | |
eec8b6ca | 573 | int (*_dl_check_caller) (const void *, enum allowmask); |
9dcafc55 UD |
574 | void *(*_dl_open) (const char *file, int mode, const void *caller_dlopen, |
575 | Lmid_t nsid, int argc, char *argv[], char *env[]); | |
576 | void (*_dl_close) (void *map); | |
93025f93 | 577 | void *(*_dl_tls_get_addr_soft) (struct link_map *); |
7c22c7ec UD |
578 | #ifdef HAVE_DL_DISCOVER_OSVERSION |
579 | int (*_dl_discover_osversion) (void); | |
580 | #endif | |
154d10bd | 581 | |
9dcafc55 UD |
582 | /* List of auditing interfaces. */ |
583 | struct audit_ifaces *_dl_audit; | |
584 | unsigned int _dl_naudit; | |
9be09e06 UD |
585 | |
586 | /* 0 if internal pointer values should not be guarded, 1 if they should. */ | |
587 | EXTERN int _dl_pointer_guard; | |
20c37dfd UD |
588 | }; |
589 | # define __rtld_global_attribute__ | |
590 | # ifdef IS_IN_rtld | |
11bf311e | 591 | # define __rtld_local_attribute__ __attribute__ ((visibility ("hidden"))) |
20c37dfd UD |
592 | extern struct rtld_global_ro _rtld_local_ro |
593 | attribute_relro __rtld_local_attribute__; | |
20c37dfd UD |
594 | extern struct rtld_global_ro _rtld_global_ro |
595 | attribute_relro __rtld_global_attribute__; | |
021723ab | 596 | # undef __rtld_local_attribute__ |
154d10bd UD |
597 | # else |
598 | /* We cheat a bit here. We declare the variable as as const even | |
599 | though it is at startup. */ | |
600 | extern const struct rtld_global_ro _rtld_global_ro | |
601 | attribute_relro __rtld_global_attribute__; | |
602 | # endif | |
021723ab | 603 | # undef __rtld_global_attribute__ |
20c37dfd | 604 | #endif |
d6b5d570 UD |
605 | #undef EXTERN |
606 | ||
3d3436ae RM |
607 | #ifndef SHARED |
608 | /* dl-support.c defines these and initializes them early on. */ | |
dc0a0263 | 609 | extern const ElfW(Phdr) *_dl_phdr; |
3d3436ae RM |
610 | extern size_t _dl_phnum; |
611 | #endif | |
612 | ||
68dc80ca RM |
613 | #ifdef IS_IN_rtld |
614 | /* This is the initial value of GL(dl_error_catch_tsd). | |
615 | A non-TLS libpthread will change it. */ | |
616 | extern void **_dl_initial_error_catch_tsd (void) __attribute__ ((const)) | |
617 | attribute_hidden; | |
618 | #endif | |
619 | ||
ecdeaac0 RM |
620 | /* This is the initial value of GL(dl_make_stack_executable_hook). |
621 | A threads library can change it. */ | |
d1fc817e | 622 | extern int _dl_make_stack_executable (void **stack_endp) internal_function; |
ecdeaac0 RM |
623 | rtld_hidden_proto (_dl_make_stack_executable) |
624 | ||
ea4f25a7 UD |
625 | /* Variable pointing to the end of the stack (or close to it). This value |
626 | must be constant over the runtime of the application. Some programs | |
627 | might use the variable which results in copy relocations on some | |
628 | platforms. But this does not matter, ld.so can always use the local | |
629 | copy. */ | |
5d5722e8 ST |
630 | extern void *__libc_stack_end |
631 | #ifndef LIBC_STACK_END_NOT_RELRO | |
632 | attribute_relro | |
633 | #endif | |
634 | ; | |
ea4f25a7 UD |
635 | rtld_hidden_proto (__libc_stack_end) |
636 | ||
d6b5d570 | 637 | /* Parameters passed to the dynamic linker. */ |
392a6b52 | 638 | extern int _dl_argc attribute_hidden attribute_relro; |
33ab3b66 UD |
639 | extern char **_dl_argv |
640 | #ifndef DL_ARGV_NOT_RELRO | |
641 | attribute_relro | |
642 | #endif | |
643 | ; | |
4243cbea | 644 | rtld_hidden_proto (_dl_argv) |
403e0597 | 645 | #ifdef IS_IN_rtld |
8347c74c RM |
646 | extern unsigned int _dl_skip_args attribute_hidden |
647 | # ifndef DL_ARGV_NOT_RELRO | |
648 | attribute_relro | |
649 | # endif | |
650 | ; | |
651 | extern unsigned int _dl_skip_args_internal attribute_hidden | |
652 | # ifndef DL_ARGV_NOT_RELRO | |
653 | attribute_relro | |
654 | # endif | |
655 | ; | |
e6caf4e1 | 656 | #endif |
4243cbea | 657 | #define rtld_progname _dl_argv[0] |
d6b5d570 | 658 | |
5bbcba0d RM |
659 | /* Flag set at startup and cleared when the last initializer has run. */ |
660 | extern int _dl_starting_up; | |
661 | weak_extern (_dl_starting_up) | |
b5b9cfc4 | 662 | #ifdef IS_IN_rtld |
5bbcba0d RM |
663 | extern int _dl_starting_up_internal attribute_hidden; |
664 | #endif | |
f55727ca | 665 | |
965cb60a | 666 | /* Random data provided by the kernel. */ |
d09580b1 | 667 | extern void *_dl_random attribute_hidden attribute_relro; |
965cb60a | 668 | |
a42195db UD |
669 | /* OS-dependent function to open the zero-fill device. */ |
670 | extern int _dl_sysdep_open_zero_fill (void); /* dl-sysdep.c */ | |
671 | ||
b5ba0659 UD |
672 | |
673 | /* Write message on the debug file descriptor. The parameters are | |
674 | interpreted as for a `printf' call. All the lines start with a | |
675 | tag showing the PID. */ | |
676 | extern void _dl_debug_printf (const char *fmt, ...) | |
154d10bd | 677 | __attribute__ ((__format__ (__printf__, 1, 2))) attribute_hidden; |
b5ba0659 UD |
678 | |
679 | /* Write message on the debug file descriptor. The parameters are | |
680 | interpreted as for a `printf' call. All the lines buf the first | |
681 | start with a tag showing the PID. */ | |
682 | extern void _dl_debug_printf_c (const char *fmt, ...) | |
683 | __attribute__ ((__format__ (__printf__, 1, 2))); | |
684 | ||
685 | ||
686 | /* Write a message on the specified descriptor FD. The parameters are | |
687 | interpreted as for a `printf' call. */ | |
688 | extern void _dl_dprintf (int fd, const char *fmt, ...) | |
6ce3881d RM |
689 | __attribute__ ((__format__ (__printf__, 2, 3))) |
690 | attribute_hidden; | |
b5ba0659 UD |
691 | |
692 | /* Write a message on the specified descriptor standard output. The | |
693 | parameters are interpreted as for a `printf' call. */ | |
694 | #define _dl_printf(fmt, args...) \ | |
695 | _dl_dprintf (STDOUT_FILENO, fmt, ##args) | |
696 | ||
697 | /* Write a message on the specified descriptor standard error. The | |
698 | parameters are interpreted as for a `printf' call. */ | |
699 | #define _dl_error_printf(fmt, args...) \ | |
700 | _dl_dprintf (STDERR_FILENO, fmt, ##args) | |
701 | ||
702 | /* Write a message on the specified descriptor standard error and exit | |
703 | the program. The parameters are interpreted as for a `printf' call. */ | |
704 | #define _dl_fatal_printf(fmt, args...) \ | |
a42195db UD |
705 | do \ |
706 | { \ | |
b5ba0659 | 707 | _dl_dprintf (STDERR_FILENO, fmt, ##args); \ |
a42195db UD |
708 | _exit (127); \ |
709 | } \ | |
710 | while (1) | |
711 | ||
a42195db UD |
712 | |
713 | /* This function is called by all the internal dynamic linker functions | |
714 | when they encounter an error. ERRCODE is either an `errno' code or | |
715 | zero; OBJECT is the name of the problematical shared object, or null if | |
716 | it is a general problem; ERRSTRING is a string describing the specific | |
717 | problem. */ | |
8e17ea58 | 718 | extern void _dl_signal_error (int errcode, const char *object, |
407fe3bb | 719 | const char *occurred, const char *errstring) |
6ce3881d | 720 | internal_function __attribute__ ((__noreturn__)) attribute_hidden; |
a42195db UD |
721 | |
722 | /* Like _dl_signal_error, but may return when called in the context of | |
723 | _dl_receive_error. */ | |
407fe3bb UD |
724 | extern void _dl_signal_cerror (int errcode, const char *object, |
725 | const char *occation, const char *errstring) | |
a42195db UD |
726 | internal_function; |
727 | ||
728 | /* Call OPERATE, receiving errors from `dl_signal_cerror'. Unlike | |
729 | `_dl_catch_error' the operation is resumed after the OPERATE | |
730 | function returns. | |
731 | ARGS is passed as argument to OPERATE. */ | |
732 | extern void _dl_receive_error (receiver_fct fct, void (*operate) (void *), | |
733 | void *args) | |
734 | internal_function; | |
735 | ||
736 | ||
737 | /* Open the shared object NAME and map in its segments. | |
738 | LOADER's DT_RPATH is used in searching for NAME. | |
8e9f92e9 | 739 | If the object is already opened, returns its existing map. */ |
a42195db | 740 | extern struct link_map *_dl_map_object (struct link_map *loader, |
8e9f92e9 | 741 | const char *name, |
c0f62c56 UD |
742 | int type, int trace_mode, int mode, |
743 | Lmid_t nsid) | |
6ce3881d | 744 | internal_function attribute_hidden; |
a42195db UD |
745 | |
746 | /* Call _dl_map_object on the dependencies of MAP, and set up | |
747 | MAP->l_searchlist. PRELOADS points to a vector of NPRELOADS previously | |
748 | loaded objects that will be inserted into MAP->l_searchlist after MAP | |
749 | but before its dependencies. */ | |
750 | extern void _dl_map_object_deps (struct link_map *map, | |
751 | struct link_map **preloads, | |
87837aac UD |
752 | unsigned int npreloads, int trace_mode, |
753 | int open_mode) | |
6ce3881d | 754 | internal_function attribute_hidden; |
a42195db UD |
755 | |
756 | /* Cache the locations of MAP's hash table. */ | |
6ce3881d RM |
757 | extern void _dl_setup_hash (struct link_map *map) |
758 | internal_function attribute_hidden; | |
a42195db UD |
759 | |
760 | ||
45e4762c RM |
761 | /* Collect the directories in the search path for LOADER's dependencies. |
762 | The data structure is defined in <dlfcn.h>. If COUNTING is true, | |
763 | SI->dls_cnt and SI->dls_size are set; if false, those must be as set | |
764 | by a previous call with COUNTING set, and SI must point to SI->dls_size | |
765 | bytes to be used in filling in the result. */ | |
766 | extern void _dl_rtld_di_serinfo (struct link_map *loader, | |
767 | Dl_serinfo *si, bool counting) | |
768 | internal_function; | |
769 | ||
770 | ||
a42195db UD |
771 | /* Search loaded objects' symbol tables for a definition of the symbol |
772 | referred to by UNDEF. *SYM is the symbol table entry containing the | |
773 | reference; it is replaced with the defining symbol, and the base load | |
774 | address of the defining object is returned. SYMBOL_SCOPE is a | |
775 | null-terminated list of object scopes to search; each object's | |
776 | l_searchlist (i.e. the segment of the dependency tree starting at that | |
777 | object) is searched in turn. REFERENCE_NAME should name the object | |
778 | containing the reference; it is used in error messages. | |
cf5a372e | 779 | TYPE_CLASS describes the type of symbol we are looking for. */ |
f9f2a150 UD |
780 | enum |
781 | { | |
782 | /* If necessary add dependency between user and provider object. */ | |
783 | DL_LOOKUP_ADD_DEPENDENCY = 1, | |
784 | /* Return most recent version instead of default version for | |
785 | unversioned lookup. */ | |
b90395e6 UD |
786 | DL_LOOKUP_RETURN_NEWEST = 2, |
787 | /* Set if dl_lookup* called with GSCOPE lock held. */ | |
788 | DL_LOOKUP_GSCOPE_LOCK = 4, | |
f9f2a150 UD |
789 | }; |
790 | ||
a42195db | 791 | /* Lookup versioned symbol. */ |
021723ab UD |
792 | extern lookup_t _dl_lookup_symbol_x (const char *undef, |
793 | struct link_map *undef_map, | |
794 | const ElfW(Sym) **sym, | |
795 | struct r_scope_elem *symbol_scope[], | |
796 | const struct r_found_version *version, | |
4e35ef2c | 797 | int type_class, int flags, |
021723ab | 798 | struct link_map *skip_map) |
6ce3881d | 799 | internal_function attribute_hidden; |
a42195db | 800 | |
a42195db UD |
801 | |
802 | /* Look up symbol NAME in MAP's scope and return its run-time address. */ | |
803 | extern ElfW(Addr) _dl_symbol_value (struct link_map *map, const char *name) | |
804 | internal_function; | |
805 | ||
f0967738 AK |
806 | /* Add the new link_map NEW to the end of the namespace list. */ |
807 | extern void _dl_add_to_namespace_list (struct link_map *new, Lmid_t nsid) | |
808 | internal_function attribute_hidden; | |
809 | ||
810 | /* Allocate a `struct link_map' for a new object being loaded. */ | |
a42195db | 811 | extern struct link_map *_dl_new_object (char *realname, const char *libname, |
1fc07491 | 812 | int type, struct link_map *loader, |
c0f62c56 | 813 | int mode, Lmid_t nsid) |
6ce3881d | 814 | internal_function attribute_hidden; |
a42195db UD |
815 | |
816 | /* Relocate the given object (if it hasn't already been). | |
817 | SCOPE is passed to _dl_lookup_symbol in symbol lookups. | |
2ca285b0 | 818 | If RTLD_LAZY is set in RELOC-MODE, don't relocate its PLT. */ |
a42195db UD |
819 | extern void _dl_relocate_object (struct link_map *map, |
820 | struct r_scope_elem *scope[], | |
2ca285b0 | 821 | int reloc_mode, int consider_profiling) |
6ce3881d | 822 | attribute_hidden; |
a42195db | 823 | |
e8648a5a UD |
824 | /* Protect PT_GNU_RELRO area. */ |
825 | extern void _dl_protect_relro (struct link_map *map) | |
826 | internal_function attribute_hidden; | |
827 | ||
a42195db UD |
828 | /* Call _dl_signal_error with a message about an unhandled reloc type. |
829 | TYPE is the result of ELFW(R_TYPE) (r_info), i.e. an R_<CPU>_* value. | |
830 | PLT is nonzero if this was a PLT reloc; it just affects the message. */ | |
831 | extern void _dl_reloc_bad_type (struct link_map *map, | |
ea41b926 UD |
832 | unsigned int type, int plt) |
833 | internal_function __attribute__ ((__noreturn__)); | |
a42195db | 834 | |
32e6df36 UD |
835 | /* Resolve conflicts if prelinking. */ |
836 | extern void _dl_resolve_conflicts (struct link_map *l, | |
837 | ElfW(Rela) *conflict, | |
838 | ElfW(Rela) *conflictend); | |
839 | ||
a42195db UD |
840 | /* Check the version dependencies of all objects available through |
841 | MAP. If VERBOSE print some more diagnostics. */ | |
145b8413 UD |
842 | extern int _dl_check_all_versions (struct link_map *map, int verbose, |
843 | int trace_mode) | |
a42195db UD |
844 | internal_function; |
845 | ||
846 | /* Check the version dependencies for MAP. If VERBOSE print some more | |
847 | diagnostics. */ | |
145b8413 UD |
848 | extern int _dl_check_map_versions (struct link_map *map, int verbose, |
849 | int trace_mode) | |
a42195db UD |
850 | internal_function; |
851 | ||
dacc8ffa UD |
852 | /* Initialize the object in SCOPE by calling the constructors with |
853 | ARGC, ARGV, and ENV as the parameters. */ | |
854 | extern void _dl_init (struct link_map *main_map, int argc, char **argv, | |
154d10bd | 855 | char **env) internal_function attribute_hidden; |
a42195db UD |
856 | |
857 | /* Call the finalizer functions of all shared objects whose | |
858 | initializer functions have completed. */ | |
859 | extern void _dl_fini (void) internal_function; | |
860 | ||
c3381f3e | 861 | /* Sort array MAPS according to dependencies of the contained objects. */ |
c8835729 MP |
862 | extern void _dl_sort_fini (struct link_map **maps, size_t nmaps, char *used, |
863 | Lmid_t ns) | |
c3381f3e UD |
864 | internal_function; |
865 | ||
a42195db UD |
866 | /* The dynamic linker calls this function before and having changing |
867 | any shared object mappings. The `r_state' member of `struct r_debug' | |
868 | says what change is taking place. This function's address is | |
869 | the value of the `r_brk' member. */ | |
7e46ec8c UD |
870 | extern void _dl_debug_state (void); |
871 | rtld_hidden_proto (_dl_debug_state) | |
a42195db UD |
872 | |
873 | /* Initialize `struct r_debug' if it has not already been done. The | |
874 | argument is the run-time load address of the dynamic linker, to be put | |
875 | in the `r_ldbase' member. Returns the address of the structure. */ | |
29f97654 | 876 | extern struct r_debug *_dl_debug_initialize (ElfW(Addr) ldbase, Lmid_t ns) |
a42195db UD |
877 | internal_function; |
878 | ||
879 | /* Initialize the basic data structure for the search paths. */ | |
880 | extern void _dl_init_paths (const char *library_path) internal_function; | |
881 | ||
882 | /* Gather the information needed to install the profiling tables and start | |
883 | the timers. */ | |
53bfdc1c | 884 | extern void _dl_start_profile (void) internal_function attribute_hidden; |
a42195db UD |
885 | |
886 | /* The actual functions used to keep book on the calls. */ | |
887 | extern void _dl_mcount (ElfW(Addr) frompc, ElfW(Addr) selfpc); | |
9360906d UD |
888 | extern void _dl_mcount_internal (ElfW(Addr) frompc, ElfW(Addr) selfpc) |
889 | attribute_hidden; | |
a42195db UD |
890 | |
891 | /* This function is simply a wrapper around the _dl_mcount function | |
892 | which does not require a FROMPC parameter since this is the | |
893 | calling function. */ | |
894 | extern void _dl_mcount_wrapper (void *selfpc); | |
895 | ||
896 | /* Show the members of the auxiliary array passed up from the kernel. */ | |
897 | extern void _dl_show_auxv (void) internal_function; | |
898 | ||
899 | /* Return all environment variables starting with `LD_', one after the | |
900 | other. */ | |
901 | extern char *_dl_next_ld_env_entry (char ***position) internal_function; | |
902 | ||
903 | /* Return an array with the names of the important hardware capabilities. */ | |
904 | extern const struct r_strlenpair *_dl_important_hwcaps (const char *platform, | |
905 | size_t paltform_len, | |
906 | size_t *sz, | |
907 | size_t *max_capstrlen) | |
908 | internal_function; | |
909 | ||
48896b9d AJ |
910 | /* Look up NAME in ld.so.cache and return the file name stored there, |
911 | or null if none is found. */ | |
912 | extern const char *_dl_load_cache_lookup (const char *name) | |
913 | internal_function; | |
914 | ||
915 | /* If the system does not support MAP_COPY we cannot leave the file open | |
916 | all the time since this would create problems when the file is replaced. | |
917 | Therefore we provide this function to close the file and open it again | |
918 | once needed. */ | |
154d10bd | 919 | extern void _dl_unload_cache (void) attribute_hidden; |
48896b9d | 920 | |
40b07f5b UD |
921 | /* System-dependent function to read a file's whole contents in the |
922 | most convenient manner available. *SIZEP gets the size of the | |
923 | file. On error MAP_FAILED is returned. */ | |
48896b9d AJ |
924 | extern void *_dl_sysdep_read_whole_file (const char *file, size_t *sizep, |
925 | int prot) | |
6ce3881d | 926 | internal_function attribute_hidden; |
48896b9d AJ |
927 | |
928 | /* System-specific function to do initial startup for the dynamic linker. | |
929 | After this, file access calls and getenv must work. This is responsible | |
930 | for setting __libc_enable_secure if we need to be secure (e.g. setuid), | |
931 | and for setting _dl_argc and _dl_argv, and then calling _dl_main. */ | |
932 | extern ElfW(Addr) _dl_sysdep_start (void **start_argptr, | |
933 | void (*dl_main) (const ElfW(Phdr) *phdr, | |
934 | ElfW(Word) phnum, | |
3a56ea26 AK |
935 | ElfW(Addr) *user_entry, |
936 | ElfW(auxv_t) *auxv)) | |
6ce3881d | 937 | attribute_hidden; |
48896b9d AJ |
938 | |
939 | extern void _dl_sysdep_start_cleanup (void) | |
6ce3881d | 940 | internal_function attribute_hidden; |
48896b9d AJ |
941 | |
942 | ||
3fb55878 | 943 | /* Determine next available module ID. */ |
68dc80ca | 944 | extern size_t _dl_next_tls_modid (void) internal_function attribute_hidden; |
3fb55878 | 945 | |
d0503676 CD |
946 | /* Count the modules with TLS segments. */ |
947 | extern size_t _dl_count_modids (void) internal_function attribute_hidden; | |
948 | ||
3fb55878 | 949 | /* Calculate offset of the TLS blocks in the static TLS block. */ |
68dc80ca RM |
950 | extern void _dl_determine_tlsoffset (void) internal_function attribute_hidden; |
951 | ||
952 | /* Set up the data structures for TLS, when they were not set up at startup. | |
953 | Returns nonzero on malloc failure. | |
954 | This is called from _dl_map_object_from_fd or by libpthread. */ | |
955 | extern int _dl_tls_setup (void) internal_function; | |
956 | rtld_hidden_proto (_dl_tls_setup) | |
3fb55878 | 957 | |
9a1eb38e UD |
958 | /* Allocate memory for static TLS block (unless MEM is nonzero) and dtv. */ |
959 | extern void *_dl_allocate_tls (void *mem) internal_function; | |
733f25e6 | 960 | rtld_hidden_proto (_dl_allocate_tls) |
9a1eb38e UD |
961 | |
962 | /* Get size and alignment requirements of the static TLS block. */ | |
963 | extern void _dl_get_tls_static_info (size_t *sizep, size_t *alignp) | |
964 | internal_function; | |
a816b435 | 965 | |
adc12574 | 966 | extern void _dl_allocate_static_tls (struct link_map *map) |
545dbc93 RM |
967 | internal_function attribute_hidden; |
968 | ||
a816b435 RM |
969 | /* These are internal entry points to the two halves of _dl_allocate_tls, |
970 | only used within rtld.c itself at startup time. */ | |
971 | extern void *_dl_allocate_tls_storage (void) | |
68dc80ca | 972 | internal_function attribute_hidden; |
209a8ca3 | 973 | extern void *_dl_allocate_tls_init (void *) internal_function; |
68dc80ca | 974 | rtld_hidden_proto (_dl_allocate_tls_init) |
e4138261 UD |
975 | |
976 | /* Deallocate memory allocated with _dl_allocate_tls. */ | |
9a1eb38e | 977 | extern void _dl_deallocate_tls (void *tcb, bool dealloc_tcb) internal_function; |
733f25e6 | 978 | rtld_hidden_proto (_dl_deallocate_tls) |
3fb55878 | 979 | |
adc12574 | 980 | extern void _dl_nothread_init_static_tls (struct link_map *) attribute_hidden; |
adc12574 | 981 | |
154d10bd UD |
982 | /* Find origin of the executable. */ |
983 | extern const char *_dl_get_origin (void) attribute_hidden; | |
984 | ||
985 | /* Count DSTs. */ | |
986 | extern size_t _dl_dst_count (const char *name, int is_path) attribute_hidden; | |
987 | ||
988 | /* Substitute DST values. */ | |
989 | extern char *_dl_dst_substitute (struct link_map *l, const char *name, | |
990 | char *result, int is_path) attribute_hidden; | |
991 | ||
eec8b6ca UD |
992 | /* Check validity of the caller. */ |
993 | extern int _dl_check_caller (const void *caller, enum allowmask mask) | |
994 | attribute_hidden; | |
995 | ||
9dcafc55 UD |
996 | /* Open the shared object NAME, relocate it, and run its initializer if it |
997 | hasn't already been run. MODE is as for `dlopen' (see <dlfcn.h>). If | |
998 | the object is already opened, returns its existing map. */ | |
999 | extern void *_dl_open (const char *name, int mode, const void *caller, | |
1000 | Lmid_t nsid, int argc, char *argv[], char *env[]) | |
1001 | attribute_hidden; | |
1002 | ||
e4eb675d UD |
1003 | /* Free or queue for freeing scope OLD. If other threads might be |
1004 | in the middle of _dl_fixup, _dl_profile_fixup or dl*sym using the | |
1005 | old scope, OLD can't be freed until no thread is using it. */ | |
385b4cf4 | 1006 | extern int _dl_scope_free (void *) attribute_hidden; |
e4eb675d | 1007 | |
9dcafc55 UD |
1008 | /* Add module to slot information data. */ |
1009 | extern void _dl_add_to_slotinfo (struct link_map *l) attribute_hidden; | |
1010 | ||
1011 | /* Update slot information data for at least the generation of the | |
1012 | module with the given index. */ | |
1013 | extern struct link_map *_dl_update_slotinfo (unsigned long int req_modid); | |
1014 | ||
d78efd9f RM |
1015 | /* Look up the module's TLS block as for __tls_get_addr, |
1016 | but never touch anything. Return null if it's not allocated yet. */ | |
93025f93 | 1017 | extern void *_dl_tls_get_addr_soft (struct link_map *l) attribute_hidden; |
d78efd9f | 1018 | |
9be09e06 UD |
1019 | extern int _dl_addr_inside_object (struct link_map *l, const ElfW(Addr) addr) |
1020 | internal_function attribute_hidden; | |
d78efd9f | 1021 | |
73d7af4f | 1022 | /* Show show of an object. */ |
174baab3 | 1023 | extern void _dl_show_scope (struct link_map *new, int from); |
73d7af4f | 1024 | |
be179c8a SP |
1025 | extern struct link_map *_dl_find_dso_for_object (const ElfW(Addr) addr) |
1026 | internal_function; | |
1027 | rtld_hidden_proto (_dl_find_dso_for_object) | |
1028 | ||
bc16e260 RM |
1029 | /* Initialization which is normally done by the dynamic linker. */ |
1030 | extern void _dl_non_dynamic_init (void) internal_function; | |
1031 | ||
1032 | /* Used by static binaries to check the auxiliary vector. */ | |
1033 | extern void _dl_aux_init (ElfW(auxv_t) *av) internal_function; | |
1034 | ||
1035 | ||
a42195db UD |
1036 | __END_DECLS |
1037 | ||
1038 | #endif /* ldsodefs.h */ |