1/* Run-time dynamic linker data structures for loaded ELF shared objects.
2 Copyright (C) 1995-2020 Free Software Foundation, Inc.
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 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.
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 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#ifndef _LDSODEFS_H
20#define _LDSODEFS_H 1
21
22#include <features.h>
23
24#include <stdbool.h>
25#define __need_size_t
26#define __need_NULL
27#include <stddef.h>
28#include <string.h>
29#include <stdint.h>
30
31#include <elf.h>
32#include <dlfcn.h>
33#include <fpu_control.h>
34#include <sys/mman.h>
35#include <link.h>
36#include <dl-lookupcfg.h>
37#include <dl-sysdep.h>
38#include <libc-lock.h>
39#include <hp-timing.h>
40#include <tls.h>
41
42__BEGIN_DECLS
43
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
50/* Type of GNU hash which the machine uses. */
51#ifndef ELF_MACHINE_GNU_HASH_ADDRIDX
52# define ELF_MACHINE_GNU_HASH_ADDRIDX ADDRIDX (DT_GNU_HASH)
53#endif
54
55/* Calculate the index of a symbol in GNU hash. */
56#ifndef ELF_MACHINE_HASH_SYMIDX
57# define ELF_MACHINE_HASH_SYMIDX(map, hasharr) \
58 ((hasharr) - (map)->l_gnu_chain_zero)
59#endif
60
61/* Setup MIPS xhash. Defined only for MIPS. */
62#ifndef ELF_MACHINE_XHASH_SETUP
63# define ELF_MACHINE_XHASH_SETUP(hash32, symbias, map) \
64 ((void) (hash32), (void) (symbias), (void) (map))
65#endif
66
67/* We use this macro to refer to ELF types independent of the native wordsize.
68 `ElfW(TYPE)' is used in place of `Elf32_TYPE' or `Elf64_TYPE'. */
69#define ELFW(type) _ElfW (ELF, __ELF_NATIVE_CLASS, type)
70
71/* All references to the value of l_info[DT_PLTGOT],
72 l_info[DT_STRTAB], l_info[DT_SYMTAB], l_info[DT_RELA],
73 l_info[DT_REL], l_info[DT_JMPREL], and l_info[VERSYMIDX (DT_VERSYM)]
74 have to be accessed via the D_PTR macro. The macro is needed since for
75 most architectures the entry is already relocated - but for some not
76 and we need to relocate at access time. */
77#ifdef DL_RO_DYN_SECTION
78# define D_PTR(map, i) ((map)->i->d_un.d_ptr + (map)->l_addr)
79#else
80# define D_PTR(map, i) (map)->i->d_un.d_ptr
81#endif
82
83/* Result of the lookup functions and how to retrieve the base address. */
84typedef struct link_map *lookup_t;
85#define LOOKUP_VALUE(map) map
86#define LOOKUP_VALUE_ADDRESS(map, set) ((set) || (map) ? (map)->l_addr : 0)
87
88/* Calculate the address of symbol REF using the base address from map MAP,
89 if non-NULL. Don't check for NULL map if MAP_SET is TRUE. */
90#define SYMBOL_ADDRESS(map, ref, map_set) \
91 ((ref) == NULL ? 0 \
92 : (__glibc_unlikely ((ref)->st_shndx == SHN_ABS) ? 0 \
93 : LOOKUP_VALUE_ADDRESS (map, map_set)) + (ref)->st_value)
94
95/* On some architectures a pointer to a function is not just a pointer
96 to the actual code of the function but rather an architecture
97 specific descriptor. */
98#ifndef ELF_FUNCTION_PTR_IS_SPECIAL
99# define DL_SYMBOL_ADDRESS(map, ref) \
100 (void *) SYMBOL_ADDRESS (map, ref, false)
101# define DL_LOOKUP_ADDRESS(addr) ((ElfW(Addr)) (addr))
102# define DL_CALL_DT_INIT(map, start, argc, argv, env) \
103 ((init_t) (start)) (argc, argv, env)
104# define DL_CALL_DT_FINI(map, start) ((fini_t) (start)) ()
105#endif
106
107/* On some architectures dladdr can't use st_size of all symbols this way. */
108#define DL_ADDR_SYM_MATCH(L, SYM, MATCHSYM, ADDR) \
109 ((ADDR) >= (L)->l_addr + (SYM)->st_value \
110 && ((((SYM)->st_shndx == SHN_UNDEF || (SYM)->st_size == 0) \
111 && (ADDR) == (L)->l_addr + (SYM)->st_value) \
112 || (ADDR) < (L)->l_addr + (SYM)->st_value + (SYM)->st_size) \
113 && ((MATCHSYM) == NULL || (MATCHSYM)->st_value < (SYM)->st_value))
114
115/* According to the ELF gABI no STV_HIDDEN or STV_INTERNAL symbols are
116 expected to be present in dynamic symbol tables as they should have
117 been either removed or converted to STB_LOCAL binding by the static
118 linker. However some GNU binutils versions produce such symbols in
119 some cases. To prevent such symbols present in a buggy binary from
120 preempting global symbols we filter them out with this predicate. */
121static __always_inline bool
122dl_symbol_visibility_binds_local_p (const ElfW(Sym) *sym)
123{
124 return (ELFW(ST_VISIBILITY) (sym->st_other) == STV_HIDDEN
125 || ELFW(ST_VISIBILITY) (sym->st_other) == STV_INTERNAL);
126}
127
128/* Unmap a loaded object, called by _dl_close (). */
129#ifndef DL_UNMAP_IS_SPECIAL
130# define DL_UNMAP(map) _dl_unmap_segments (map)
131#endif
132
133/* By default we do not need special support to initialize DSOs loaded
134 by statically linked binaries. */
135#ifndef DL_STATIC_INIT
136# define DL_STATIC_INIT(map)
137#endif
138
139/* Reloc type classes as returned by elf_machine_type_class().
140 ELF_RTYPE_CLASS_PLT means this reloc should not be satisfied by
141 some PLT symbol, ELF_RTYPE_CLASS_COPY means this reloc should not be
142 satisfied by any symbol in the executable. Some architectures do
143 not support copy relocations. In this case we define the macro to
144 zero so that the code for handling them gets automatically optimized
145 out. ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA means address of protected
146 data defined in the shared library may be external, i.e., due to copy
147 relocation. */
148#define ELF_RTYPE_CLASS_PLT 1
149#ifndef DL_NO_COPY_RELOCS
150# define ELF_RTYPE_CLASS_COPY 2
151#else
152# define ELF_RTYPE_CLASS_COPY 0
153#endif
154/* If DL_EXTERN_PROTECTED_DATA is defined, address of protected data
155 defined in the shared library may be external, i.e., due to copy
156 relocation. */
157#ifdef DL_EXTERN_PROTECTED_DATA
158# define ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA 4
159#else
160# define ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA 0
161#endif
162
163/* ELF uses the PF_x macros to specify the segment permissions, mmap
164 uses PROT_xxx. In most cases the three macros have the values 1, 2,
165 and 3 but not in a matching order. The following macros allows
166 converting from the PF_x values to PROT_xxx values. */
167#define PF_TO_PROT \
168 ((PROT_READ << (PF_R * 4)) \
169 | (PROT_WRITE << (PF_W * 4)) \
170 | (PROT_EXEC << (PF_X * 4)) \
171 | ((PROT_READ | PROT_WRITE) << ((PF_R | PF_W) * 4)) \
172 | ((PROT_READ | PROT_EXEC) << ((PF_R | PF_X) * 4)) \
173 | ((PROT_WRITE | PROT_EXEC) << (PF_W | PF_X) * 4) \
174 | ((PROT_READ | PROT_WRITE | PROT_EXEC) << ((PF_R | PF_W | PF_X) * 4)))
175
176/* The filename itself, or the main program name, if available. */
177#define DSO_FILENAME(name) ((name)[0] ? (name) \
178 : (rtld_progname ?: "<main program>"))
179
180#define RTLD_PROGNAME (rtld_progname ?: "<program name unknown>")
181
182/* For the version handling we need an array with only names and their
183 hash values. */
184struct r_found_version
185 {
186 const char *name;
187 ElfW(Word) hash;
188
189 int hidden;
190 const char *filename;
191 };
192
193/* We want to cache information about the searches for shared objects. */
194
195enum r_dir_status { unknown, nonexisting, existing };
196
197struct r_search_path_elem
198 {
199 /* This link is only used in the `all_dirs' member of `r_search_path'. */
200 struct r_search_path_elem *next;
201
202 /* Strings saying where the definition came from. */
203 const char *what;
204 const char *where;
205
206 /* Basename for this search path element. The string must end with
207 a slash character. */
208 const char *dirname;
209 size_t dirnamelen;
210
211 enum r_dir_status status[0];
212 };
213
214struct r_strlenpair
215 {
216 const char *str;
217 size_t len;
218 };
219
220
221/* A data structure for a simple single linked list of strings. */
222struct libname_list
223 {
224 const char *name; /* Name requested (before search). */
225 struct libname_list *next; /* Link to next name for this object. */
226 int dont_free; /* Flag whether this element should be freed
227 if the object is not entirely unloaded. */
228 };
229
230
231/* Bit masks for the objects which valid callers can come from to
232 functions with restricted interface. */
233enum allowmask
234 {
235 allow_libc = 1,
236 allow_libdl = 2,
237 allow_libpthread = 4,
238 allow_ldso = 8
239 };
240
241
242struct audit_ifaces
243{
244 void (*activity) (uintptr_t *, unsigned int);
245 char *(*objsearch) (const char *, uintptr_t *, unsigned int);
246 unsigned int (*objopen) (struct link_map *, Lmid_t, uintptr_t *);
247 void (*preinit) (uintptr_t *);
248 union
249 {
250 uintptr_t (*symbind32) (Elf32_Sym *, unsigned int, uintptr_t *,
251 uintptr_t *, unsigned int *, const char *);
252 uintptr_t (*symbind64) (Elf64_Sym *, unsigned int, uintptr_t *,
253 uintptr_t *, unsigned int *, const char *);
254 };
255 union
256 {
257#ifdef ARCH_PLTENTER_MEMBERS
258 ARCH_PLTENTER_MEMBERS;
259#endif
260 };
261 union
262 {
263#ifdef ARCH_PLTEXIT_MEMBERS
264 ARCH_PLTEXIT_MEMBERS;
265#endif
266 };
267 unsigned int (*objclose) (uintptr_t *);
268
269 struct audit_ifaces *next;
270};
271
272
273/* Test whether given NAME matches any of the names of the given object. */
274extern int _dl_name_match_p (const char *__name, const struct link_map *__map)
275 attribute_hidden;
276
277/* Compute next higher prime number. */
278extern unsigned long int _dl_higher_prime_number (unsigned long int n)
279 attribute_hidden;
280
281/* A stripped down strtoul-like implementation. */
282uint64_t _dl_strtoul (const char *, char **) attribute_hidden;
283
284/* Function used as argument for `_dl_receive_error' function. The
285 arguments are the error code, error string, and the objname the
286 error occurred in. */
287typedef void (*receiver_fct) (int, const char *, const char *);
288
289/* Internal functions of the run-time dynamic linker.
290 These can be accessed if you link again the dynamic linker
291 as a shared library, as in `-lld' or `/lib/ld.so' explicitly;
292 but are not normally of interest to user programs.
293
294 The `-ldl' library functions in <dlfcn.h> provide a simple
295 user interface to run-time dynamic linking. */
296
297
298#ifndef SHARED
299# define EXTERN extern
300# define GL(name) _##name
301#else
302# define EXTERN
303# if IS_IN (rtld)
304# define GL(name) _rtld_local._##name
305# else
306# define GL(name) _rtld_global._##name
307# endif
308struct rtld_global
309{
310#endif
311 /* Don't change the order of the following elements. 'dl_loaded'
312 must remain the first element. Forever. */
313
314/* Non-shared code has no support for multiple namespaces. */
315#ifdef SHARED
316# define DL_NNS 16
317#else
318# define DL_NNS 1
319#endif
320 EXTERN struct link_namespaces
321 {
322 /* A pointer to the map for the main map. */
323 struct link_map *_ns_loaded;
324 /* Number of object in the _dl_loaded list. */
325 unsigned int _ns_nloaded;
326 /* Direct pointer to the searchlist of the main object. */
327 struct r_scope_elem *_ns_main_searchlist;
328 /* This is zero at program start to signal that the global scope map is
329 allocated by rtld. Later it keeps the size of the map. It might be
330 reset if in _dl_close if the last global object is removed. */
331 unsigned int _ns_global_scope_alloc;
332
333 /* During dlopen, this is the number of objects that still need to
334 be added to the global scope map. It has to be taken into
335 account when resizing the map, for future map additions after
336 recursive dlopen calls from ELF constructors. */
337 unsigned int _ns_global_scope_pending_adds;
338
339 /* Once libc.so has been loaded into the namespace, this points to
340 its link map. */
341 struct link_map *libc_map;
342
343 /* Search table for unique objects. */
344 struct unique_sym_table
345 {
346 __rtld_lock_define_recursive (, lock)
347 struct unique_sym
348 {
349 uint32_t hashval;
350 const char *name;
351 const ElfW(Sym) *sym;
352 const struct link_map *map;
353 } *entries;
354 size_t size;
355 size_t n_elements;
356 void (*free) (void *);
357 } _ns_unique_sym_table;
358 /* Keep track of changes to each namespace' list. */
359 struct r_debug _ns_debug;
360 } _dl_ns[DL_NNS];
361 /* One higher than index of last used namespace. */
362 EXTERN size_t _dl_nns;
363
364 /* During the program run we must not modify the global data of
365 loaded shared object simultanously in two threads. Therefore we
366 protect `_dl_open' and `_dl_close' in dl-close.c.
367
368 This must be a recursive lock since the initializer function of
369 the loaded object might as well require a call to this function.
370 At this time it is not anymore a problem to modify the tables. */
371 __rtld_lock_define_recursive (EXTERN, _dl_load_lock)
372 /* This lock is used to keep __dl_iterate_phdr from inspecting the
373 list of loaded objects while an object is added to or removed
374 from that list. */
375 __rtld_lock_define_recursive (EXTERN, _dl_load_write_lock)
376
377 /* Incremented whenever something may have been added to dl_loaded. */
378 EXTERN unsigned long long _dl_load_adds;
379
380 /* The object to be initialized first. */
381 EXTERN struct link_map *_dl_initfirst;
382
383 /* Map of shared object to be profiled. */
384 EXTERN struct link_map *_dl_profile_map;
385
386 /* Counters for the number of relocations performed. */
387 EXTERN unsigned long int _dl_num_relocations;
388 EXTERN unsigned long int _dl_num_cache_relocations;
389
390 /* List of search directories. */
391 EXTERN struct r_search_path_elem *_dl_all_dirs;
392
393 /* Structure describing the dynamic linker itself. */
394 EXTERN struct link_map _dl_rtld_map;
395#ifdef SHARED
396 /* Used to store the audit information for the link map of the
397 dynamic loader. */
398 struct auditstate _dl_rtld_auditstate[DL_NNS];
399#endif
400
401#if defined SHARED && defined _LIBC_REENTRANT \
402 && defined __rtld_lock_default_lock_recursive
403 EXTERN void (*_dl_rtld_lock_recursive) (void *);
404 EXTERN void (*_dl_rtld_unlock_recursive) (void *);
405#endif
406
407 /* Get architecture specific definitions. */
408#define PROCINFO_DECL
409#ifndef PROCINFO_CLASS
410# define PROCINFO_CLASS EXTERN
411#endif
412#include <dl-procruntime.c>
413
414 /* If loading a shared object requires that we make the stack executable
415 when it was not, we do it by calling this function.
416 It returns an errno code or zero on success. */
417 EXTERN int (*_dl_make_stack_executable_hook) (void **);
418
419 /* Prevailing state of the stack, PF_X indicating it's executable. */
420 EXTERN ElfW(Word) _dl_stack_flags;
421
422 /* Flag signalling whether there are gaps in the module ID allocation. */
423 EXTERN bool _dl_tls_dtv_gaps;
424 /* Highest dtv index currently needed. */
425 EXTERN size_t _dl_tls_max_dtv_idx;
426 /* Information about the dtv slots. */
427 EXTERN struct dtv_slotinfo_list
428 {
429 size_t len;
430 struct dtv_slotinfo_list *next;
431 struct dtv_slotinfo
432 {
433 size_t gen;
434 struct link_map *map;
435 } slotinfo[];
436 } *_dl_tls_dtv_slotinfo_list;
437 /* Number of modules in the static TLS block. */
438 EXTERN size_t _dl_tls_static_nelem;
439 /* Size of the static TLS block. */
440 EXTERN size_t _dl_tls_static_size;
441 /* Size actually allocated in the static TLS block. */
442 EXTERN size_t _dl_tls_static_used;
443 /* Alignment requirement of the static TLS block. */
444 EXTERN size_t _dl_tls_static_align;
445 /* Remaining amount of static TLS that may be used for optimizing
446 dynamic TLS access (e.g. with TLSDESC). */
447 EXTERN size_t _dl_tls_static_optional;
448
449/* Number of additional entries in the slotinfo array of each slotinfo
450 list element. A large number makes it almost certain take we never
451 have to iterate beyond the first element in the slotinfo list. */
452#define TLS_SLOTINFO_SURPLUS (62)
453
454/* Number of additional slots in the dtv allocated. */
455#define DTV_SURPLUS (14)
456
457 /* Initial dtv of the main thread, not allocated with normal malloc. */
458 EXTERN void *_dl_initial_dtv;
459 /* Generation counter for the dtv. */
460 EXTERN size_t _dl_tls_generation;
461
462 EXTERN void (*_dl_init_static_tls) (struct link_map *);
463
464 EXTERN void (*_dl_wait_lookup_done) (void);
465
466 /* Scopes to free after next THREAD_GSCOPE_WAIT (). */
467 EXTERN struct dl_scope_free_list
468 {
469 size_t count;
470 void *list[50];
471 } *_dl_scope_free_list;
472#if !THREAD_GSCOPE_IN_TCB
473 EXTERN int _dl_thread_gscope_count;
474#endif
475#ifdef SHARED
476};
477# define __rtld_global_attribute__
478# if IS_IN (rtld)
479# ifdef HAVE_SDATA_SECTION
480# define __rtld_local_attribute__ \
481 __attribute__ ((visibility ("hidden"), section (".sdata")))
482# undef __rtld_global_attribute__
483# define __rtld_global_attribute__ __attribute__ ((section (".sdata")))
484# else
485# define __rtld_local_attribute__ __attribute__ ((visibility ("hidden")))
486# endif
487extern struct rtld_global _rtld_local __rtld_local_attribute__;
488# undef __rtld_local_attribute__
489# endif
490extern struct rtld_global _rtld_global __rtld_global_attribute__;
491# undef __rtld_global_attribute__
492#endif
493
494#ifndef SHARED
495# define GLRO(name) _##name
496#else
497# if IS_IN (rtld)
498# define GLRO(name) _rtld_local_ro._##name
499# else
500# define GLRO(name) _rtld_global_ro._##name
501# endif
502struct rtld_global_ro
503{
504#endif
505
506 /* If nonzero the appropriate debug information is printed. */
507 EXTERN int _dl_debug_mask;
508#define DL_DEBUG_LIBS (1 << 0)
509#define DL_DEBUG_IMPCALLS (1 << 1)
510#define DL_DEBUG_BINDINGS (1 << 2)
511#define DL_DEBUG_SYMBOLS (1 << 3)
512#define DL_DEBUG_VERSIONS (1 << 4)
513#define DL_DEBUG_RELOC (1 << 5)
514#define DL_DEBUG_FILES (1 << 6)
515#define DL_DEBUG_STATISTICS (1 << 7)
516#define DL_DEBUG_UNUSED (1 << 8)
517#define DL_DEBUG_SCOPES (1 << 9)
518/* These two are used only internally. */
519#define DL_DEBUG_HELP (1 << 10)
520#define DL_DEBUG_PRELINK (1 << 11)
521
522 /* OS version. */
523 EXTERN unsigned int _dl_osversion;
524 /* Platform name. */
525 EXTERN const char *_dl_platform;
526 EXTERN size_t _dl_platformlen;
527
528 /* Cached value of `getpagesize ()'. */
529 EXTERN size_t _dl_pagesize;
530
531 /* Do we read from ld.so.cache? */
532 EXTERN int _dl_inhibit_cache;
533
534 /* Copy of the content of `_dl_main_searchlist' at startup time. */
535 EXTERN struct r_scope_elem _dl_initial_searchlist;
536
537 /* CLK_TCK as reported by the kernel. */
538 EXTERN int _dl_clktck;
539
540 /* If nonzero print warnings messages. */
541 EXTERN int _dl_verbose;
542
543 /* File descriptor to write debug messages to. */
544 EXTERN int _dl_debug_fd;
545
546 /* Do we do lazy relocations? */
547 EXTERN int _dl_lazy;
548
549 /* Nonzero if runtime lookups should not update the .got/.plt. */
550 EXTERN int _dl_bind_not;
551
552 /* Nonzero if references should be treated as weak during runtime
553 linking. */
554 EXTERN int _dl_dynamic_weak;
555
556 /* Default floating-point control word. */
557 EXTERN fpu_control_t _dl_fpu_control;
558
559 /* Expected cache ID. */
560 EXTERN int _dl_correct_cache_id;
561
562 /* Mask for hardware capabilities that are available. */
563 EXTERN uint64_t _dl_hwcap;
564
565#if !HAVE_TUNABLES
566 /* Mask for important hardware capabilities we honour. */
567 EXTERN uint64_t _dl_hwcap_mask;
568#endif
569
570#ifdef HAVE_AUX_VECTOR
571 /* Pointer to the auxv list supplied to the program at startup. */
572 EXTERN ElfW(auxv_t) *_dl_auxv;
573#endif
574
575 /* Get architecture specific definitions. */
576#include <dl-procinfo.c>
577
578 /* Names of shared object for which the RPATH should be ignored. */
579 EXTERN const char *_dl_inhibit_rpath;
580
581 /* Location of the binary. */
582 EXTERN const char *_dl_origin_path;
583
584 /* -1 if the dynamic linker should honor library load bias,
585 0 if not, -2 use the default (honor biases for normal
586 binaries, don't honor for PIEs). */
587 EXTERN ElfW(Addr) _dl_use_load_bias;
588
589 /* Size of surplus space in the static TLS area for dynamically
590 loaded modules with IE-model TLS or for TLSDESC optimization.
591 See comments in elf/dl-tls.c where it is initialized. */
592 EXTERN size_t _dl_tls_static_surplus;
593
594 /* Name of the shared object to be profiled (if any). */
595 EXTERN const char *_dl_profile;
596 /* Filename of the output file. */
597 EXTERN const char *_dl_profile_output;
598 /* Name of the object we want to trace the prelinking. */
599 EXTERN const char *_dl_trace_prelink;
600 /* Map of shared object to be prelink traced. */
601 EXTERN struct link_map *_dl_trace_prelink_map;
602
603 /* All search directories defined at startup. This is assigned a
604 non-NULL pointer by the ld.so startup code (after initialization
605 to NULL), so this can also serve as an indicator whether a copy
606 of ld.so is initialized and active. See the rtld_active function
607 below. */
608 EXTERN struct r_search_path_elem *_dl_init_all_dirs;
609
610#ifdef NEED_DL_SYSINFO
611 /* Syscall handling improvements. This is very specific to x86. */
612 EXTERN uintptr_t _dl_sysinfo;
613#endif
614
615#ifdef NEED_DL_SYSINFO_DSO
616 /* The vsyscall page is a virtual DSO pre-mapped by the kernel.
617 This points to its ELF header. */
618 EXTERN const ElfW(Ehdr) *_dl_sysinfo_dso;
619
620 /* At startup time we set up the normal DSO data structure for it,
621 and this points to it. */
622 EXTERN struct link_map *_dl_sysinfo_map;
623
624# define PROCINFO_DECL
625# ifndef PROCINFO_CLASS
626# define PROCINFO_CLASS EXTERN
627# endif
628# include <dl-vdso-setup.c>
629#endif
630
631 /* Mask for more hardware capabilities that are available on some
632 platforms. */
633 EXTERN uint64_t _dl_hwcap2;
634
635#ifdef SHARED
636 /* We add a function table to _rtld_global which is then used to
637 call the function instead of going through the PLT. The result
638 is that we can avoid exporting the functions and we do not jump
639 PLT relocations in libc.so. */
640 void (*_dl_debug_printf) (const char *, ...)
641 __attribute__ ((__format__ (__printf__, 1, 2)));
642 void (*_dl_mcount) (ElfW(Addr) frompc, ElfW(Addr) selfpc);
643 lookup_t (*_dl_lookup_symbol_x) (const char *, struct link_map *,
644 const ElfW(Sym) **, struct r_scope_elem *[],
645 const struct r_found_version *, int, int,
646 struct link_map *);
647 void *(*_dl_open) (const char *file, int mode, const void *caller_dlopen,
648 Lmid_t nsid, int argc, char *argv[], char *env[]);
649 void (*_dl_close) (void *map);
650 void *(*_dl_tls_get_addr_soft) (struct link_map *);
651#ifdef HAVE_DL_DISCOVER_OSVERSION
652 int (*_dl_discover_osversion) (void);
653#endif
654
655 /* List of auditing interfaces. */
656 struct audit_ifaces *_dl_audit;
657 unsigned int _dl_naudit;
658};
659# define __rtld_global_attribute__
660# if IS_IN (rtld)
661# define __rtld_local_attribute__ __attribute__ ((visibility ("hidden")))
662extern struct rtld_global_ro _rtld_local_ro
663 attribute_relro __rtld_local_attribute__;
664extern struct rtld_global_ro _rtld_global_ro
665 attribute_relro __rtld_global_attribute__;
666# undef __rtld_local_attribute__
667# else
668/* We cheat a bit here. We declare the variable as as const even
669 though it is at startup. */
670extern const struct rtld_global_ro _rtld_global_ro
671 attribute_relro __rtld_global_attribute__;
672# endif
673# undef __rtld_global_attribute__
674#endif
675#undef EXTERN
676
677#ifndef SHARED
678/* dl-support.c defines these and initializes them early on. */
679extern const ElfW(Phdr) *_dl_phdr;
680extern size_t _dl_phnum;
681#endif
682
683/* This is the initial value of GL(dl_make_stack_executable_hook).
684 A threads library can change it. */
685extern int _dl_make_stack_executable (void **stack_endp);
686rtld_hidden_proto (_dl_make_stack_executable)
687
688/* Variable pointing to the end of the stack (or close to it). This value
689 must be constant over the runtime of the application. Some programs
690 might use the variable which results in copy relocations on some
691 platforms. But this does not matter, ld.so can always use the local
692 copy. */
693extern void *__libc_stack_end
694#ifndef LIBC_STACK_END_NOT_RELRO
695 attribute_relro
696#endif
697 ;
698rtld_hidden_proto (__libc_stack_end)
699
700/* Parameters passed to the dynamic linker. */
701extern int _dl_argc attribute_hidden attribute_relro;
702extern char **_dl_argv
703#ifndef DL_ARGV_NOT_RELRO
704 attribute_relro
705#endif
706 ;
707rtld_hidden_proto (_dl_argv)
708#if IS_IN (rtld)
709extern unsigned int _dl_skip_args attribute_hidden
710# ifndef DL_ARGV_NOT_RELRO
711 attribute_relro
712# endif
713 ;
714extern unsigned int _dl_skip_args_internal attribute_hidden
715# ifndef DL_ARGV_NOT_RELRO
716 attribute_relro
717# endif
718 ;
719#endif
720#define rtld_progname _dl_argv[0]
721
722/* Flag set at startup and cleared when the last initializer has run. */
723extern int _dl_starting_up;
724weak_extern (_dl_starting_up)
725rtld_hidden_proto (_dl_starting_up)
726
727/* Random data provided by the kernel. */
728extern void *_dl_random attribute_hidden attribute_relro;
729
730/* Write message on the debug file descriptor. The parameters are
731 interpreted as for a `printf' call. All the lines start with a
732 tag showing the PID. */
733extern void _dl_debug_printf (const char *fmt, ...)
734 __attribute__ ((__format__ (__printf__, 1, 2))) attribute_hidden;
735
736/* Write message on the debug file descriptor. The parameters are
737 interpreted as for a `printf' call. All the lines buf the first
738 start with a tag showing the PID. */
739extern void _dl_debug_printf_c (const char *fmt, ...)
740 __attribute__ ((__format__ (__printf__, 1, 2))) attribute_hidden;
741
742
743/* Write a message on the specified descriptor FD. The parameters are
744 interpreted as for a `printf' call. */
745#if IS_IN (rtld) || !defined (SHARED)
746extern void _dl_dprintf (int fd, const char *fmt, ...)
747 __attribute__ ((__format__ (__printf__, 2, 3)))
748 attribute_hidden;
749#else
750__attribute__ ((always_inline, __format__ (__printf__, 2, 3)))
751static inline void
752_dl_dprintf (int fd, const char *fmt, ...)
753{
754 /* Use local declaration to avoid includign <stdio.h>. */
755 extern int __dprintf(int fd, const char *format, ...) attribute_hidden;
756 __dprintf (fd, fmt, __builtin_va_arg_pack ());
757}
758#endif
759
760/* Write a message on the specified descriptor standard output. The
761 parameters are interpreted as for a `printf' call. */
762void _dl_printf (const char *fmt, ...)
763 attribute_hidden __attribute__ ((__format__ (__printf__, 1, 2)));
764
765/* Write a message on the specified descriptor standard error. The
766 parameters are interpreted as for a `printf' call. */
767void _dl_error_printf (const char *fmt, ...)
768 attribute_hidden __attribute__ ((__format__ (__printf__, 1, 2)));
769
770/* Write a message on the specified descriptor standard error and exit
771 the program. The parameters are interpreted as for a `printf' call. */
772void _dl_fatal_printf (const char *fmt, ...)
773 __attribute__ ((__format__ (__printf__, 1, 2), __noreturn__));
774rtld_hidden_proto (_dl_fatal_printf)
775
776/* An exception raised by the _dl_signal_error function family and
777 caught by _dl_catch_error function family. Exceptions themselves
778 are copied as part of the raise operation, but the strings are
779 not. */
780struct dl_exception
781{
782 const char *objname;
783 const char *errstring;
784
785 /* This buffer typically stores both objname and errstring
786 above. */
787 char *message_buffer;
788};
789
790/* Creates a new exception. This calls malloc; if allocation fails,
791 dummy values are inserted. OBJECT is the name of the problematical
792 shared object, or null if its a general problem. ERRSTRING is a
793 string describing the specific problem. */
794void _dl_exception_create (struct dl_exception *, const char *object,
795 const char *errstring)
796 __attribute__ ((nonnull (1, 3)));
797rtld_hidden_proto (_dl_exception_create)
798
799/* Like _dl_exception_create, but create errstring from a format
800 string FMT. Currently, only "%s" and "%%" are supported as format
801 directives. */
802void _dl_exception_create_format (struct dl_exception *, const char *objname,
803 const char *fmt, ...)
804 __attribute__ ((nonnull (1, 3), format (printf, 3, 4)));
805rtld_hidden_proto (_dl_exception_create_format)
806
807/* Deallocate the exception, freeing allocated buffers (if
808 possible). */
809void _dl_exception_free (struct dl_exception *)
810 __attribute__ ((nonnull (1)));
811rtld_hidden_proto (_dl_exception_free)
812
813/* This function is called by all the internal dynamic linker
814 functions when they encounter an error. ERRCODE is either an
815 `errno' code or zero; it specifies the return value of
816 _dl_catch_error. OCCASION is included in the error message if the
817 process is terminated immediately. */
818void _dl_signal_exception (int errcode, struct dl_exception *,
819 const char *occasion)
820 __attribute__ ((__noreturn__));
821libc_hidden_proto (_dl_signal_exception)
822
823/* Like _dl_signal_exception, but creates the exception first. */
824extern void _dl_signal_error (int errcode, const char *object,
825 const char *occasion, const char *errstring)
826 __attribute__ ((__noreturn__));
827libc_hidden_proto (_dl_signal_error)
828
829/* Like _dl_signal_exception, but may return when called in the
830 context of _dl_receive_error. This is only used during ld.so
831 bootstrap. In static and profiled builds, this is equivalent to
832 _dl_signal_exception. */
833#if IS_IN (rtld)
834extern void _dl_signal_cexception (int errcode, struct dl_exception *,
835 const char *occasion) attribute_hidden;
836#else
837__attribute__ ((always_inline))
838static inline void
839_dl_signal_cexception (int errcode, struct dl_exception *exception,
840 const char *occasion)
841{
842 _dl_signal_exception (errcode, exception, occasion);
843}
844#endif
845
846/* See _dl_signal_cexception above. */
847#if IS_IN (rtld)
848extern void _dl_signal_cerror (int errcode, const char *object,
849 const char *occasion, const char *errstring)
850 attribute_hidden;
851#else
852__attribute__ ((always_inline))
853static inline void
854_dl_signal_cerror (int errcode, const char *object,
855 const char *occasion, const char *errstring)
856{
857 _dl_signal_error (errcode, object, occasion, errstring);
858}
859#endif
860
861/* Call OPERATE, receiving errors from `dl_signal_cerror'. Unlike
862 `_dl_catch_error' the operation is resumed after the OPERATE
863 function returns.
864 ARGS is passed as argument to OPERATE. */
865extern void _dl_receive_error (receiver_fct fct, void (*operate) (void *),
866 void *args) attribute_hidden;
867
868/* Call OPERATE, catching errors from `_dl_signal_error' and related
869 functions. If there is no error, *ERRSTRING is set to null. If
870 there is an error, *ERRSTRING is set to a string constructed from
871 the strings passed to _dl_signal_error, and the error code passed
872 is the return value and *OBJNAME is set to the object name which
873 experienced the problems. ERRSTRING if nonzero points to a
874 malloc'ed string which the caller has to free after use. ARGS is
875 passed as argument to OPERATE. MALLOCEDP is set to true only if
876 the returned string is allocated using the libc's malloc. */
877extern int _dl_catch_error (const char **objname, const char **errstring,
878 bool *mallocedp, void (*operate) (void *),
879 void *args);
880libc_hidden_proto (_dl_catch_error)
881
882/* Call OPERATE (ARGS). If no error occurs, set *EXCEPTION to zero.
883 Otherwise, store a copy of the raised exception in *EXCEPTION,
884 which has to be freed by _dl_exception_free. As a special case, if
885 EXCEPTION is null, call OPERATE (ARGS) with exception handling
886 disabled (so that exceptions are fatal). */
887int _dl_catch_exception (struct dl_exception *exception,
888 void (*operate) (void *), void *args);
889libc_hidden_proto (_dl_catch_exception)
890
891/* Open the shared object NAME and map in its segments.
892 LOADER's DT_RPATH is used in searching for NAME.
893 If the object is already opened, returns its existing map. */
894extern struct link_map *_dl_map_object (struct link_map *loader,
895 const char *name,
896 int type, int trace_mode, int mode,
897 Lmid_t nsid) attribute_hidden;
898
899/* Call _dl_map_object on the dependencies of MAP, and set up
900 MAP->l_searchlist. PRELOADS points to a vector of NPRELOADS previously
901 loaded objects that will be inserted into MAP->l_searchlist after MAP
902 but before its dependencies. */
903extern void _dl_map_object_deps (struct link_map *map,
904 struct link_map **preloads,
905 unsigned int npreloads, int trace_mode,
906 int open_mode)
907 attribute_hidden;
908
909/* Cache the locations of MAP's hash table. */
910extern void _dl_setup_hash (struct link_map *map) attribute_hidden;
911
912
913/* Collect the directories in the search path for LOADER's dependencies.
914 The data structure is defined in <dlfcn.h>. If COUNTING is true,
915 SI->dls_cnt and SI->dls_size are set; if false, those must be as set
916 by a previous call with COUNTING set, and SI must point to SI->dls_size
917 bytes to be used in filling in the result. */
918extern void _dl_rtld_di_serinfo (struct link_map *loader,
919 Dl_serinfo *si, bool counting);
920
921/* Process PT_GNU_PROPERTY program header PH in module L after
922 PT_LOAD segments are mapped. */
923void _dl_process_pt_gnu_property (struct link_map *l, const ElfW(Phdr) *ph);
924
925
926/* Search loaded objects' symbol tables for a definition of the symbol
927 referred to by UNDEF. *SYM is the symbol table entry containing the
928 reference; it is replaced with the defining symbol, and the base load
929 address of the defining object is returned. SYMBOL_SCOPE is a
930 null-terminated list of object scopes to search; each object's
931 l_searchlist (i.e. the segment of the dependency tree starting at that
932 object) is searched in turn. REFERENCE_NAME should name the object
933 containing the reference; it is used in error messages.
934 TYPE_CLASS describes the type of symbol we are looking for. */
935enum
936 {
937 /* If necessary add dependency between user and provider object. */
938 DL_LOOKUP_ADD_DEPENDENCY = 1,
939 /* Return most recent version instead of default version for
940 unversioned lookup. */
941 DL_LOOKUP_RETURN_NEWEST = 2,
942 /* Set if dl_lookup* called with GSCOPE lock held. */
943 DL_LOOKUP_GSCOPE_LOCK = 4,
944 /* Set if dl_lookup is called for non-lazy relocation processing
945 from _dl_relocate_object in elf/dl-reloc.c. */
946 DL_LOOKUP_FOR_RELOCATE = 8,
947 };
948
949/* Lookup versioned symbol. */
950extern lookup_t _dl_lookup_symbol_x (const char *undef,
951 struct link_map *undef_map,
952 const ElfW(Sym) **sym,
953 struct r_scope_elem *symbol_scope[],
954 const struct r_found_version *version,
955 int type_class, int flags,
956 struct link_map *skip_map)
957 attribute_hidden;
958
959
960/* Restricted version of _dl_lookup_symbol_x. Searches MAP (and only
961 MAP) for the symbol UNDEF_NAME, with GNU hash NEW_HASH (computed
962 with dl_new_hash), symbol version VERSION, and symbol version hash
963 VERSION_HASH (computed with _dl_elf_hash). Returns a pointer to
964 the symbol table entry in MAP on success, or NULL on failure. MAP
965 must have symbol versioning information, or otherwise the result is
966 undefined. */
967const ElfW(Sym) *_dl_lookup_direct (struct link_map *map,
968 const char *undef_name,
969 uint32_t new_hash,
970 const char *version,
971 uint32_t version_hash) attribute_hidden;
972
973/* Add the new link_map NEW to the end of the namespace list. */
974extern void _dl_add_to_namespace_list (struct link_map *new, Lmid_t nsid)
975 attribute_hidden;
976
977/* Allocate a `struct link_map' for a new object being loaded. */
978extern struct link_map *_dl_new_object (char *realname, const char *libname,
979 int type, struct link_map *loader,
980 int mode, Lmid_t nsid)
981 attribute_hidden;
982
983/* Relocate the given object (if it hasn't already been).
984 SCOPE is passed to _dl_lookup_symbol in symbol lookups.
985 If RTLD_LAZY is set in RELOC-MODE, don't relocate its PLT. */
986extern void _dl_relocate_object (struct link_map *map,
987 struct r_scope_elem *scope[],
988 int reloc_mode, int consider_profiling)
989 attribute_hidden;
990
991/* Protect PT_GNU_RELRO area. */
992extern void _dl_protect_relro (struct link_map *map) attribute_hidden;
993
994/* Call _dl_signal_error with a message about an unhandled reloc type.
995 TYPE is the result of ELFW(R_TYPE) (r_info), i.e. an R_<CPU>_* value.
996 PLT is nonzero if this was a PLT reloc; it just affects the message. */
997extern void _dl_reloc_bad_type (struct link_map *map,
998 unsigned int type, int plt)
999 attribute_hidden __attribute__ ((__noreturn__));
1000
1001/* Resolve conflicts if prelinking. */
1002extern void _dl_resolve_conflicts (struct link_map *l,
1003 ElfW(Rela) *conflict,
1004 ElfW(Rela) *conflictend)
1005 attribute_hidden;
1006
1007/* Check the version dependencies of all objects available through
1008 MAP. If VERBOSE print some more diagnostics. */
1009extern int _dl_check_all_versions (struct link_map *map, int verbose,
1010 int trace_mode) attribute_hidden;
1011
1012/* Check the version dependencies for MAP. If VERBOSE print some more
1013 diagnostics. */
1014extern int _dl_check_map_versions (struct link_map *map, int verbose,
1015 int trace_mode) attribute_hidden;
1016
1017/* Initialize the object in SCOPE by calling the constructors with
1018 ARGC, ARGV, and ENV as the parameters. */
1019extern void _dl_init (struct link_map *main_map, int argc, char **argv,
1020 char **env) attribute_hidden;
1021
1022/* Call the finalizer functions of all shared objects whose
1023 initializer functions have completed. */
1024extern void _dl_fini (void) attribute_hidden;
1025
1026/* Sort array MAPS according to dependencies of the contained objects. */
1027extern void _dl_sort_maps (struct link_map **maps, unsigned int nmaps,
1028 char *used, bool for_fini) attribute_hidden;
1029
1030/* The dynamic linker calls this function before and having changing
1031 any shared object mappings. The `r_state' member of `struct r_debug'
1032 says what change is taking place. This function's address is
1033 the value of the `r_brk' member. */
1034extern void _dl_debug_state (void);
1035rtld_hidden_proto (_dl_debug_state)
1036
1037/* Initialize `struct r_debug' if it has not already been done. The
1038 argument is the run-time load address of the dynamic linker, to be put
1039 in the `r_ldbase' member. Returns the address of the structure. */
1040extern struct r_debug *_dl_debug_initialize (ElfW(Addr) ldbase, Lmid_t ns)
1041 attribute_hidden;
1042
1043/* Initialize the basic data structure for the search paths. */
1044extern void _dl_init_paths (const char *library_path) attribute_hidden;
1045
1046/* Gather the information needed to install the profiling tables and start
1047 the timers. */
1048extern void _dl_start_profile (void) attribute_hidden;
1049
1050/* The actual functions used to keep book on the calls. */
1051extern void _dl_mcount (ElfW(Addr) frompc, ElfW(Addr) selfpc);
1052rtld_hidden_proto (_dl_mcount)
1053
1054/* This function is simply a wrapper around the _dl_mcount function
1055 which does not require a FROMPC parameter since this is the
1056 calling function. */
1057extern void _dl_mcount_wrapper (void *selfpc);
1058
1059/* Show the members of the auxiliary array passed up from the kernel. */
1060extern void _dl_show_auxv (void) attribute_hidden;
1061
1062/* Return all environment variables starting with `LD_', one after the
1063 other. */
1064extern char *_dl_next_ld_env_entry (char ***position) attribute_hidden;
1065
1066/* Return an array with the names of the important hardware capabilities. */
1067extern const struct r_strlenpair *_dl_important_hwcaps (const char *platform,
1068 size_t paltform_len,
1069 size_t *sz,
1070 size_t *max_capstrlen)
1071 attribute_hidden;
1072
1073/* Look up NAME in ld.so.cache and return the file name stored there,
1074 or null if none is found. Caller must free returned string. */
1075extern char *_dl_load_cache_lookup (const char *name) attribute_hidden;
1076
1077/* If the system does not support MAP_COPY we cannot leave the file open
1078 all the time since this would create problems when the file is replaced.
1079 Therefore we provide this function to close the file and open it again
1080 once needed. */
1081extern void _dl_unload_cache (void) attribute_hidden;
1082
1083/* System-dependent function to read a file's whole contents in the
1084 most convenient manner available. *SIZEP gets the size of the
1085 file. On error MAP_FAILED is returned. */
1086extern void *_dl_sysdep_read_whole_file (const char *file, size_t *sizep,
1087 int prot) attribute_hidden;
1088
1089/* System-specific function to do initial startup for the dynamic linker.
1090 After this, file access calls and getenv must work. This is responsible
1091 for setting __libc_enable_secure if we need to be secure (e.g. setuid),
1092 and for setting _dl_argc and _dl_argv, and then calling _dl_main. */
1093extern ElfW(Addr) _dl_sysdep_start (void **start_argptr,
1094 void (*dl_main) (const ElfW(Phdr) *phdr,
1095 ElfW(Word) phnum,
1096 ElfW(Addr) *user_entry,
1097 ElfW(auxv_t) *auxv))
1098 attribute_hidden;
1099
1100extern void _dl_sysdep_start_cleanup (void) attribute_hidden;
1101
1102
1103/* Determine next available module ID. */
1104extern size_t _dl_next_tls_modid (void) attribute_hidden;
1105
1106/* Count the modules with TLS segments. */
1107extern size_t _dl_count_modids (void) attribute_hidden;
1108
1109/* Calculate offset of the TLS blocks in the static TLS block. */
1110extern void _dl_determine_tlsoffset (void) attribute_hidden;
1111
1112/* Calculate the size of the static TLS surplus, when the given
1113 number of audit modules are loaded. */
1114void _dl_tls_static_surplus_init (size_t naudit) attribute_hidden;
1115
1116#ifndef SHARED
1117/* Set up the TCB for statically linked applications. This is called
1118 early during startup because we always use TLS (for errno and the
1119 stack protector, among other things). */
1120void __libc_setup_tls (void);
1121
1122# if ENABLE_STATIC_PIE
1123/* Relocate static executable with PIE. */
1124extern void _dl_relocate_static_pie (void) attribute_hidden;
1125
1126/* Get a pointer to _dl_main_map. */
1127extern struct link_map * _dl_get_dl_main_map (void)
1128 __attribute__ ((visibility ("hidden")));
1129# else
1130# define _dl_relocate_static_pie()
1131# endif
1132#endif
1133
1134/* Initialization of libpthread for statically linked applications.
1135 If libpthread is not linked in, this is an empty function. */
1136void __pthread_initialize_minimal (void) weak_function;
1137
1138/* Allocate memory for static TLS block (unless MEM is nonzero) and dtv. */
1139extern void *_dl_allocate_tls (void *mem);
1140rtld_hidden_proto (_dl_allocate_tls)
1141
1142/* Get size and alignment requirements of the static TLS block. */
1143extern void _dl_get_tls_static_info (size_t *sizep, size_t *alignp);
1144
1145extern void _dl_allocate_static_tls (struct link_map *map) attribute_hidden;
1146
1147/* These are internal entry points to the two halves of _dl_allocate_tls,
1148 only used within rtld.c itself at startup time. */
1149extern void *_dl_allocate_tls_storage (void) attribute_hidden;
1150extern void *_dl_allocate_tls_init (void *);
1151rtld_hidden_proto (_dl_allocate_tls_init)
1152
1153/* Deallocate memory allocated with _dl_allocate_tls. */
1154extern void _dl_deallocate_tls (void *tcb, bool dealloc_tcb);
1155rtld_hidden_proto (_dl_deallocate_tls)
1156
1157extern void _dl_nothread_init_static_tls (struct link_map *) attribute_hidden;
1158
1159/* Find origin of the executable. */
1160extern const char *_dl_get_origin (void) attribute_hidden;
1161
1162/* Count DSTs. */
1163extern size_t _dl_dst_count (const char *name) attribute_hidden;
1164
1165/* Substitute DST values. */
1166extern char *_dl_dst_substitute (struct link_map *l, const char *name,
1167 char *result) attribute_hidden;
1168
1169/* Open the shared object NAME, relocate it, and run its initializer if it
1170 hasn't already been run. MODE is as for `dlopen' (see <dlfcn.h>). If
1171 the object is already opened, returns its existing map. */
1172extern void *_dl_open (const char *name, int mode, const void *caller,
1173 Lmid_t nsid, int argc, char *argv[], char *env[])
1174 attribute_hidden;
1175
1176/* Free or queue for freeing scope OLD. If other threads might be
1177 in the middle of _dl_fixup, _dl_profile_fixup or dl*sym using the
1178 old scope, OLD can't be freed until no thread is using it. */
1179extern int _dl_scope_free (void *) attribute_hidden;
1180
1181
1182/* Add module to slot information data. If DO_ADD is false, only the
1183 required memory is allocated. Must be called with GL
1184 (dl_load_lock) acquired. If the function has already been called
1185 for the link map L with !do_add, then this function will not raise
1186 an exception, otherwise it is possible that it encounters a memory
1187 allocation failure. */
1188extern void _dl_add_to_slotinfo (struct link_map *l, bool do_add)
1189 attribute_hidden;
1190
1191/* Update slot information data for at least the generation of the
1192 module with the given index. */
1193extern struct link_map *_dl_update_slotinfo (unsigned long int req_modid)
1194 attribute_hidden;
1195
1196/* Look up the module's TLS block as for __tls_get_addr,
1197 but never touch anything. Return null if it's not allocated yet. */
1198extern void *_dl_tls_get_addr_soft (struct link_map *l) attribute_hidden;
1199
1200extern int _dl_addr_inside_object (struct link_map *l, const ElfW(Addr) addr)
1201 attribute_hidden;
1202
1203/* Show show of an object. */
1204extern void _dl_show_scope (struct link_map *new, int from)
1205 attribute_hidden;
1206
1207extern struct link_map *_dl_find_dso_for_object (const ElfW(Addr) addr);
1208rtld_hidden_proto (_dl_find_dso_for_object)
1209
1210/* Initialization which is normally done by the dynamic linker. */
1211extern void _dl_non_dynamic_init (void)
1212 attribute_hidden;
1213
1214/* Used by static binaries to check the auxiliary vector. */
1215extern void _dl_aux_init (ElfW(auxv_t) *av)
1216 attribute_hidden;
1217
1218/* Return true if the ld.so copy in this namespace is actually active
1219 and working. If false, the dl_open/dlfcn hooks have to be used to
1220 call into the outer dynamic linker (which happens after static
1221 dlopen). */
1222#ifdef SHARED
1223static inline bool
1224rtld_active (void)
1225{
1226 /* The default-initialized variable does not have a non-zero
1227 dl_init_all_dirs member, so this allows us to recognize an
1228 initialized and active ld.so copy. */
1229 return GLRO(dl_init_all_dirs) != NULL;
1230}
1231
1232static inline struct auditstate *
1233link_map_audit_state (struct link_map *l, size_t index)
1234{
1235 if (l == &GL (dl_rtld_map))
1236 /* The auditstate array is stored separately. */
1237 return &GL (dl_rtld_auditstate) [index];
1238 else
1239 {
1240 /* The auditstate array follows the link map in memory. */
1241 struct auditstate *base = (struct auditstate *) (l + 1);
1242 return &base[index];
1243 }
1244}
1245#endif /* SHARED */
1246
1247__END_DECLS
1248
1249#endif /* ldsodefs.h */
1250