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 /* Search table for unique objects. */
340 struct unique_sym_table
341 {
342 __rtld_lock_define_recursive (, lock)
343 struct unique_sym
344 {
345 uint32_t hashval;
346 const char *name;
347 const ElfW(Sym) *sym;
348 const struct link_map *map;
349 } *entries;
350 size_t size;
351 size_t n_elements;
352 void (*free) (void *);
353 } _ns_unique_sym_table;
354 /* Keep track of changes to each namespace' list. */
355 struct r_debug _ns_debug;
356 } _dl_ns[DL_NNS];
357 /* One higher than index of last used namespace. */
358 EXTERN size_t _dl_nns;
359
360 /* During the program run we must not modify the global data of
361 loaded shared object simultanously in two threads. Therefore we
362 protect `_dl_open' and `_dl_close' in dl-close.c.
363
364 This must be a recursive lock since the initializer function of
365 the loaded object might as well require a call to this function.
366 At this time it is not anymore a problem to modify the tables. */
367 __rtld_lock_define_recursive (EXTERN, _dl_load_lock)
368 /* This lock is used to keep __dl_iterate_phdr from inspecting the
369 list of loaded objects while an object is added to or removed
370 from that list. */
371 __rtld_lock_define_recursive (EXTERN, _dl_load_write_lock)
372
373 /* Incremented whenever something may have been added to dl_loaded. */
374 EXTERN unsigned long long _dl_load_adds;
375
376 /* The object to be initialized first. */
377 EXTERN struct link_map *_dl_initfirst;
378
379 /* Map of shared object to be profiled. */
380 EXTERN struct link_map *_dl_profile_map;
381
382 /* Counters for the number of relocations performed. */
383 EXTERN unsigned long int _dl_num_relocations;
384 EXTERN unsigned long int _dl_num_cache_relocations;
385
386 /* List of search directories. */
387 EXTERN struct r_search_path_elem *_dl_all_dirs;
388
389 /* Structure describing the dynamic linker itself. */
390 EXTERN struct link_map _dl_rtld_map;
391#ifdef SHARED
392 /* Used to store the audit information for the link map of the
393 dynamic loader. */
394 struct auditstate _dl_rtld_auditstate[DL_NNS];
395#endif
396
397#if defined SHARED && defined _LIBC_REENTRANT \
398 && defined __rtld_lock_default_lock_recursive
399 EXTERN void (*_dl_rtld_lock_recursive) (void *);
400 EXTERN void (*_dl_rtld_unlock_recursive) (void *);
401#endif
402
403 /* Get architecture specific definitions. */
404#define PROCINFO_DECL
405#ifndef PROCINFO_CLASS
406# define PROCINFO_CLASS EXTERN
407#endif
408#include <dl-procruntime.c>
409
410 /* If loading a shared object requires that we make the stack executable
411 when it was not, we do it by calling this function.
412 It returns an errno code or zero on success. */
413 EXTERN int (*_dl_make_stack_executable_hook) (void **);
414
415 /* Prevailing state of the stack, PF_X indicating it's executable. */
416 EXTERN ElfW(Word) _dl_stack_flags;
417
418 /* Flag signalling whether there are gaps in the module ID allocation. */
419 EXTERN bool _dl_tls_dtv_gaps;
420 /* Highest dtv index currently needed. */
421 EXTERN size_t _dl_tls_max_dtv_idx;
422 /* Information about the dtv slots. */
423 EXTERN struct dtv_slotinfo_list
424 {
425 size_t len;
426 struct dtv_slotinfo_list *next;
427 struct dtv_slotinfo
428 {
429 size_t gen;
430 struct link_map *map;
431 } slotinfo[];
432 } *_dl_tls_dtv_slotinfo_list;
433 /* Number of modules in the static TLS block. */
434 EXTERN size_t _dl_tls_static_nelem;
435 /* Size of the static TLS block. */
436 EXTERN size_t _dl_tls_static_size;
437 /* Size actually allocated in the static TLS block. */
438 EXTERN size_t _dl_tls_static_used;
439 /* Alignment requirement of the static TLS block. */
440 EXTERN size_t _dl_tls_static_align;
441
442/* Number of additional entries in the slotinfo array of each slotinfo
443 list element. A large number makes it almost certain take we never
444 have to iterate beyond the first element in the slotinfo list. */
445#define TLS_SLOTINFO_SURPLUS (62)
446
447/* Number of additional slots in the dtv allocated. */
448#define DTV_SURPLUS (14)
449
450 /* Initial dtv of the main thread, not allocated with normal malloc. */
451 EXTERN void *_dl_initial_dtv;
452 /* Generation counter for the dtv. */
453 EXTERN size_t _dl_tls_generation;
454
455 EXTERN void (*_dl_init_static_tls) (struct link_map *);
456
457 EXTERN void (*_dl_wait_lookup_done) (void);
458
459 /* Scopes to free after next THREAD_GSCOPE_WAIT (). */
460 EXTERN struct dl_scope_free_list
461 {
462 size_t count;
463 void *list[50];
464 } *_dl_scope_free_list;
465#if !THREAD_GSCOPE_IN_TCB
466 EXTERN int _dl_thread_gscope_count;
467#endif
468#ifdef SHARED
469};
470# define __rtld_global_attribute__
471# if IS_IN (rtld)
472# ifdef HAVE_SDATA_SECTION
473# define __rtld_local_attribute__ \
474 __attribute__ ((visibility ("hidden"), section (".sdata")))
475# undef __rtld_global_attribute__
476# define __rtld_global_attribute__ __attribute__ ((section (".sdata")))
477# else
478# define __rtld_local_attribute__ __attribute__ ((visibility ("hidden")))
479# endif
480extern struct rtld_global _rtld_local __rtld_local_attribute__;
481# undef __rtld_local_attribute__
482# endif
483extern struct rtld_global _rtld_global __rtld_global_attribute__;
484# undef __rtld_global_attribute__
485#endif
486
487#ifndef SHARED
488# define GLRO(name) _##name
489#else
490# if IS_IN (rtld)
491# define GLRO(name) _rtld_local_ro._##name
492# else
493# define GLRO(name) _rtld_global_ro._##name
494# endif
495struct rtld_global_ro
496{
497#endif
498
499 /* If nonzero the appropriate debug information is printed. */
500 EXTERN int _dl_debug_mask;
501#define DL_DEBUG_LIBS (1 << 0)
502#define DL_DEBUG_IMPCALLS (1 << 1)
503#define DL_DEBUG_BINDINGS (1 << 2)
504#define DL_DEBUG_SYMBOLS (1 << 3)
505#define DL_DEBUG_VERSIONS (1 << 4)
506#define DL_DEBUG_RELOC (1 << 5)
507#define DL_DEBUG_FILES (1 << 6)
508#define DL_DEBUG_STATISTICS (1 << 7)
509#define DL_DEBUG_UNUSED (1 << 8)
510#define DL_DEBUG_SCOPES (1 << 9)
511/* These two are used only internally. */
512#define DL_DEBUG_HELP (1 << 10)
513#define DL_DEBUG_PRELINK (1 << 11)
514
515 /* OS version. */
516 EXTERN unsigned int _dl_osversion;
517 /* Platform name. */
518 EXTERN const char *_dl_platform;
519 EXTERN size_t _dl_platformlen;
520
521 /* Cached value of `getpagesize ()'. */
522 EXTERN size_t _dl_pagesize;
523
524 /* Do we read from ld.so.cache? */
525 EXTERN int _dl_inhibit_cache;
526
527 /* Copy of the content of `_dl_main_searchlist' at startup time. */
528 EXTERN struct r_scope_elem _dl_initial_searchlist;
529
530 /* CLK_TCK as reported by the kernel. */
531 EXTERN int _dl_clktck;
532
533 /* If nonzero print warnings messages. */
534 EXTERN int _dl_verbose;
535
536 /* File descriptor to write debug messages to. */
537 EXTERN int _dl_debug_fd;
538
539 /* Do we do lazy relocations? */
540 EXTERN int _dl_lazy;
541
542 /* Nonzero if runtime lookups should not update the .got/.plt. */
543 EXTERN int _dl_bind_not;
544
545 /* Nonzero if references should be treated as weak during runtime
546 linking. */
547 EXTERN int _dl_dynamic_weak;
548
549 /* Default floating-point control word. */
550 EXTERN fpu_control_t _dl_fpu_control;
551
552 /* Expected cache ID. */
553 EXTERN int _dl_correct_cache_id;
554
555 /* Mask for hardware capabilities that are available. */
556 EXTERN uint64_t _dl_hwcap;
557
558#if !HAVE_TUNABLES
559 /* Mask for important hardware capabilities we honour. */
560 EXTERN uint64_t _dl_hwcap_mask;
561#endif
562
563#ifdef HAVE_AUX_VECTOR
564 /* Pointer to the auxv list supplied to the program at startup. */
565 EXTERN ElfW(auxv_t) *_dl_auxv;
566#endif
567
568 /* Get architecture specific definitions. */
569#include <dl-procinfo.c>
570
571 /* Names of shared object for which the RPATH should be ignored. */
572 EXTERN const char *_dl_inhibit_rpath;
573
574 /* Location of the binary. */
575 EXTERN const char *_dl_origin_path;
576
577 /* -1 if the dynamic linker should honor library load bias,
578 0 if not, -2 use the default (honor biases for normal
579 binaries, don't honor for PIEs). */
580 EXTERN ElfW(Addr) _dl_use_load_bias;
581
582 /* Name of the shared object to be profiled (if any). */
583 EXTERN const char *_dl_profile;
584 /* Filename of the output file. */
585 EXTERN const char *_dl_profile_output;
586 /* Name of the object we want to trace the prelinking. */
587 EXTERN const char *_dl_trace_prelink;
588 /* Map of shared object to be prelink traced. */
589 EXTERN struct link_map *_dl_trace_prelink_map;
590
591 /* All search directories defined at startup. This is assigned a
592 non-NULL pointer by the ld.so startup code (after initialization
593 to NULL), so this can also serve as an indicator whether a copy
594 of ld.so is initialized and active. See the rtld_active function
595 below. */
596 EXTERN struct r_search_path_elem *_dl_init_all_dirs;
597
598#ifdef NEED_DL_SYSINFO
599 /* Syscall handling improvements. This is very specific to x86. */
600 EXTERN uintptr_t _dl_sysinfo;
601#endif
602
603#ifdef NEED_DL_SYSINFO_DSO
604 /* The vsyscall page is a virtual DSO pre-mapped by the kernel.
605 This points to its ELF header. */
606 EXTERN const ElfW(Ehdr) *_dl_sysinfo_dso;
607
608 /* At startup time we set up the normal DSO data structure for it,
609 and this points to it. */
610 EXTERN struct link_map *_dl_sysinfo_map;
611
612# define PROCINFO_DECL
613# ifndef PROCINFO_CLASS
614# define PROCINFO_CLASS EXTERN
615# endif
616# include <dl-vdso-setup.c>
617#endif
618
619 /* Mask for more hardware capabilities that are available on some
620 platforms. */
621 EXTERN uint64_t _dl_hwcap2;
622
623#ifdef SHARED
624 /* We add a function table to _rtld_global which is then used to
625 call the function instead of going through the PLT. The result
626 is that we can avoid exporting the functions and we do not jump
627 PLT relocations in libc.so. */
628 void (*_dl_debug_printf) (const char *, ...)
629 __attribute__ ((__format__ (__printf__, 1, 2)));
630 void (*_dl_mcount) (ElfW(Addr) frompc, ElfW(Addr) selfpc);
631 lookup_t (*_dl_lookup_symbol_x) (const char *, struct link_map *,
632 const ElfW(Sym) **, struct r_scope_elem *[],
633 const struct r_found_version *, int, int,
634 struct link_map *);
635 void *(*_dl_open) (const char *file, int mode, const void *caller_dlopen,
636 Lmid_t nsid, int argc, char *argv[], char *env[]);
637 void (*_dl_close) (void *map);
638 void *(*_dl_tls_get_addr_soft) (struct link_map *);
639#ifdef HAVE_DL_DISCOVER_OSVERSION
640 int (*_dl_discover_osversion) (void);
641#endif
642
643 /* List of auditing interfaces. */
644 struct audit_ifaces *_dl_audit;
645 unsigned int _dl_naudit;
646};
647# define __rtld_global_attribute__
648# if IS_IN (rtld)
649# define __rtld_local_attribute__ __attribute__ ((visibility ("hidden")))
650extern struct rtld_global_ro _rtld_local_ro
651 attribute_relro __rtld_local_attribute__;
652extern struct rtld_global_ro _rtld_global_ro
653 attribute_relro __rtld_global_attribute__;
654# undef __rtld_local_attribute__
655# else
656/* We cheat a bit here. We declare the variable as as const even
657 though it is at startup. */
658extern const struct rtld_global_ro _rtld_global_ro
659 attribute_relro __rtld_global_attribute__;
660# endif
661# undef __rtld_global_attribute__
662#endif
663#undef EXTERN
664
665#ifndef SHARED
666/* dl-support.c defines these and initializes them early on. */
667extern const ElfW(Phdr) *_dl_phdr;
668extern size_t _dl_phnum;
669#endif
670
671/* This is the initial value of GL(dl_make_stack_executable_hook).
672 A threads library can change it. */
673extern int _dl_make_stack_executable (void **stack_endp);
674rtld_hidden_proto (_dl_make_stack_executable)
675
676/* Variable pointing to the end of the stack (or close to it). This value
677 must be constant over the runtime of the application. Some programs
678 might use the variable which results in copy relocations on some
679 platforms. But this does not matter, ld.so can always use the local
680 copy. */
681extern void *__libc_stack_end
682#ifndef LIBC_STACK_END_NOT_RELRO
683 attribute_relro
684#endif
685 ;
686rtld_hidden_proto (__libc_stack_end)
687
688/* Parameters passed to the dynamic linker. */
689extern int _dl_argc attribute_hidden attribute_relro;
690extern char **_dl_argv
691#ifndef DL_ARGV_NOT_RELRO
692 attribute_relro
693#endif
694 ;
695rtld_hidden_proto (_dl_argv)
696#if IS_IN (rtld)
697extern unsigned int _dl_skip_args attribute_hidden
698# ifndef DL_ARGV_NOT_RELRO
699 attribute_relro
700# endif
701 ;
702extern unsigned int _dl_skip_args_internal attribute_hidden
703# ifndef DL_ARGV_NOT_RELRO
704 attribute_relro
705# endif
706 ;
707#endif
708#define rtld_progname _dl_argv[0]
709
710/* Flag set at startup and cleared when the last initializer has run. */
711extern int _dl_starting_up;
712weak_extern (_dl_starting_up)
713rtld_hidden_proto (_dl_starting_up)
714
715/* Random data provided by the kernel. */
716extern void *_dl_random attribute_hidden attribute_relro;
717
718/* Write message on the debug file descriptor. The parameters are
719 interpreted as for a `printf' call. All the lines start with a
720 tag showing the PID. */
721extern void _dl_debug_printf (const char *fmt, ...)
722 __attribute__ ((__format__ (__printf__, 1, 2))) attribute_hidden;
723
724/* Write message on the debug file descriptor. The parameters are
725 interpreted as for a `printf' call. All the lines buf the first
726 start with a tag showing the PID. */
727extern void _dl_debug_printf_c (const char *fmt, ...)
728 __attribute__ ((__format__ (__printf__, 1, 2))) attribute_hidden;
729
730
731/* Write a message on the specified descriptor FD. The parameters are
732 interpreted as for a `printf' call. */
733#if IS_IN (rtld) || !defined (SHARED)
734extern void _dl_dprintf (int fd, const char *fmt, ...)
735 __attribute__ ((__format__ (__printf__, 2, 3)))
736 attribute_hidden;
737#else
738__attribute__ ((always_inline, __format__ (__printf__, 2, 3)))
739static inline void
740_dl_dprintf (int fd, const char *fmt, ...)
741{
742 /* Use local declaration to avoid includign <stdio.h>. */
743 extern int __dprintf(int fd, const char *format, ...) attribute_hidden;
744 __dprintf (fd, fmt, __builtin_va_arg_pack ());
745}
746#endif
747
748/* Write a message on the specified descriptor standard output. The
749 parameters are interpreted as for a `printf' call. */
750#define _dl_printf(fmt, args...) \
751 _dl_dprintf (STDOUT_FILENO, fmt, ##args)
752
753/* Write a message on the specified descriptor standard error. The
754 parameters are interpreted as for a `printf' call. */
755#define _dl_error_printf(fmt, args...) \
756 _dl_dprintf (STDERR_FILENO, fmt, ##args)
757
758/* Write a message on the specified descriptor standard error and exit
759 the program. The parameters are interpreted as for a `printf' call. */
760#define _dl_fatal_printf(fmt, args...) \
761 do \
762 { \
763 _dl_dprintf (STDERR_FILENO, fmt, ##args); \
764 _exit (127); \
765 } \
766 while (1)
767
768
769/* An exception raised by the _dl_signal_error function family and
770 caught by _dl_catch_error function family. Exceptions themselves
771 are copied as part of the raise operation, but the strings are
772 not. */
773struct dl_exception
774{
775 const char *objname;
776 const char *errstring;
777
778 /* This buffer typically stores both objname and errstring
779 above. */
780 char *message_buffer;
781};
782
783/* Creates a new exception. This calls malloc; if allocation fails,
784 dummy values are inserted. OBJECT is the name of the problematical
785 shared object, or null if its a general problem. ERRSTRING is a
786 string describing the specific problem. */
787void _dl_exception_create (struct dl_exception *, const char *object,
788 const char *errstring)
789 __attribute__ ((nonnull (1, 3)));
790rtld_hidden_proto (_dl_exception_create)
791
792/* Like _dl_exception_create, but create errstring from a format
793 string FMT. Currently, only "%s" and "%%" are supported as format
794 directives. */
795void _dl_exception_create_format (struct dl_exception *, const char *objname,
796 const char *fmt, ...)
797 __attribute__ ((nonnull (1, 3), format (printf, 3, 4)));
798rtld_hidden_proto (_dl_exception_create_format)
799
800/* Deallocate the exception, freeing allocated buffers (if
801 possible). */
802void _dl_exception_free (struct dl_exception *)
803 __attribute__ ((nonnull (1)));
804rtld_hidden_proto (_dl_exception_free)
805
806/* This function is called by all the internal dynamic linker
807 functions when they encounter an error. ERRCODE is either an
808 `errno' code or zero; it specifies the return value of
809 _dl_catch_error. OCCASION is included in the error message if the
810 process is terminated immediately. */
811void _dl_signal_exception (int errcode, struct dl_exception *,
812 const char *occasion)
813 __attribute__ ((__noreturn__));
814libc_hidden_proto (_dl_signal_exception)
815
816/* Like _dl_signal_exception, but creates the exception first. */
817extern void _dl_signal_error (int errcode, const char *object,
818 const char *occasion, const char *errstring)
819 __attribute__ ((__noreturn__));
820libc_hidden_proto (_dl_signal_error)
821
822/* Like _dl_signal_exception, but may return when called in the
823 context of _dl_receive_error. This is only used during ld.so
824 bootstrap. In static and profiled builds, this is equivalent to
825 _dl_signal_exception. */
826#if IS_IN (rtld)
827extern void _dl_signal_cexception (int errcode, struct dl_exception *,
828 const char *occasion) attribute_hidden;
829#else
830__attribute__ ((always_inline))
831static inline void
832_dl_signal_cexception (int errcode, struct dl_exception *exception,
833 const char *occasion)
834{
835 _dl_signal_exception (errcode, exception, occasion);
836}
837#endif
838
839/* See _dl_signal_cexception above. */
840#if IS_IN (rtld)
841extern void _dl_signal_cerror (int errcode, const char *object,
842 const char *occasion, const char *errstring)
843 attribute_hidden;
844#else
845__attribute__ ((always_inline))
846static inline void
847_dl_signal_cerror (int errcode, const char *object,
848 const char *occasion, const char *errstring)
849{
850 _dl_signal_error (errcode, object, occasion, errstring);
851}
852#endif
853
854/* Call OPERATE, receiving errors from `dl_signal_cerror'. Unlike
855 `_dl_catch_error' the operation is resumed after the OPERATE
856 function returns.
857 ARGS is passed as argument to OPERATE. */
858extern void _dl_receive_error (receiver_fct fct, void (*operate) (void *),
859 void *args) attribute_hidden;
860
861/* Call OPERATE, catching errors from `_dl_signal_error' and related
862 functions. If there is no error, *ERRSTRING is set to null. If
863 there is an error, *ERRSTRING is set to a string constructed from
864 the strings passed to _dl_signal_error, and the error code passed
865 is the return value and *OBJNAME is set to the object name which
866 experienced the problems. ERRSTRING if nonzero points to a
867 malloc'ed string which the caller has to free after use. ARGS is
868 passed as argument to OPERATE. MALLOCEDP is set to true only if
869 the returned string is allocated using the libc's malloc. */
870extern int _dl_catch_error (const char **objname, const char **errstring,
871 bool *mallocedp, void (*operate) (void *),
872 void *args);
873libc_hidden_proto (_dl_catch_error)
874
875/* Call OPERATE (ARGS). If no error occurs, set *EXCEPTION to zero.
876 Otherwise, store a copy of the raised exception in *EXCEPTION,
877 which has to be freed by _dl_exception_free. As a special case, if
878 EXCEPTION is null, call OPERATE (ARGS) with exception handling
879 disabled (so that exceptions are fatal). */
880int _dl_catch_exception (struct dl_exception *exception,
881 void (*operate) (void *), void *args);
882libc_hidden_proto (_dl_catch_exception)
883
884/* Open the shared object NAME and map in its segments.
885 LOADER's DT_RPATH is used in searching for NAME.
886 If the object is already opened, returns its existing map. */
887extern struct link_map *_dl_map_object (struct link_map *loader,
888 const char *name,
889 int type, int trace_mode, int mode,
890 Lmid_t nsid) attribute_hidden;
891
892/* Call _dl_map_object on the dependencies of MAP, and set up
893 MAP->l_searchlist. PRELOADS points to a vector of NPRELOADS previously
894 loaded objects that will be inserted into MAP->l_searchlist after MAP
895 but before its dependencies. */
896extern void _dl_map_object_deps (struct link_map *map,
897 struct link_map **preloads,
898 unsigned int npreloads, int trace_mode,
899 int open_mode)
900 attribute_hidden;
901
902/* Cache the locations of MAP's hash table. */
903extern void _dl_setup_hash (struct link_map *map) attribute_hidden;
904
905
906/* Collect the directories in the search path for LOADER's dependencies.
907 The data structure is defined in <dlfcn.h>. If COUNTING is true,
908 SI->dls_cnt and SI->dls_size are set; if false, those must be as set
909 by a previous call with COUNTING set, and SI must point to SI->dls_size
910 bytes to be used in filling in the result. */
911extern void _dl_rtld_di_serinfo (struct link_map *loader,
912 Dl_serinfo *si, bool counting);
913
914
915/* Search loaded objects' symbol tables for a definition of the symbol
916 referred to by UNDEF. *SYM is the symbol table entry containing the
917 reference; it is replaced with the defining symbol, and the base load
918 address of the defining object is returned. SYMBOL_SCOPE is a
919 null-terminated list of object scopes to search; each object's
920 l_searchlist (i.e. the segment of the dependency tree starting at that
921 object) is searched in turn. REFERENCE_NAME should name the object
922 containing the reference; it is used in error messages.
923 TYPE_CLASS describes the type of symbol we are looking for. */
924enum
925 {
926 /* If necessary add dependency between user and provider object. */
927 DL_LOOKUP_ADD_DEPENDENCY = 1,
928 /* Return most recent version instead of default version for
929 unversioned lookup. */
930 DL_LOOKUP_RETURN_NEWEST = 2,
931 /* Set if dl_lookup* called with GSCOPE lock held. */
932 DL_LOOKUP_GSCOPE_LOCK = 4,
933 /* Set if dl_lookup is called for non-lazy relocation processing
934 from _dl_relocate_object in elf/dl-reloc.c. */
935 DL_LOOKUP_FOR_RELOCATE = 8,
936 };
937
938/* Lookup versioned symbol. */
939extern lookup_t _dl_lookup_symbol_x (const char *undef,
940 struct link_map *undef_map,
941 const ElfW(Sym) **sym,
942 struct r_scope_elem *symbol_scope[],
943 const struct r_found_version *version,
944 int type_class, int flags,
945 struct link_map *skip_map)
946 attribute_hidden;
947
948
949/* Add the new link_map NEW to the end of the namespace list. */
950extern void _dl_add_to_namespace_list (struct link_map *new, Lmid_t nsid)
951 attribute_hidden;
952
953/* Allocate a `struct link_map' for a new object being loaded. */
954extern struct link_map *_dl_new_object (char *realname, const char *libname,
955 int type, struct link_map *loader,
956 int mode, Lmid_t nsid)
957 attribute_hidden;
958
959/* Relocate the given object (if it hasn't already been).
960 SCOPE is passed to _dl_lookup_symbol in symbol lookups.
961 If RTLD_LAZY is set in RELOC-MODE, don't relocate its PLT. */
962extern void _dl_relocate_object (struct link_map *map,
963 struct r_scope_elem *scope[],
964 int reloc_mode, int consider_profiling)
965 attribute_hidden;
966
967/* Protect PT_GNU_RELRO area. */
968extern void _dl_protect_relro (struct link_map *map) attribute_hidden;
969
970/* Call _dl_signal_error with a message about an unhandled reloc type.
971 TYPE is the result of ELFW(R_TYPE) (r_info), i.e. an R_<CPU>_* value.
972 PLT is nonzero if this was a PLT reloc; it just affects the message. */
973extern void _dl_reloc_bad_type (struct link_map *map,
974 unsigned int type, int plt)
975 attribute_hidden __attribute__ ((__noreturn__));
976
977/* Resolve conflicts if prelinking. */
978extern void _dl_resolve_conflicts (struct link_map *l,
979 ElfW(Rela) *conflict,
980 ElfW(Rela) *conflictend)
981 attribute_hidden;
982
983/* Check the version dependencies of all objects available through
984 MAP. If VERBOSE print some more diagnostics. */
985extern int _dl_check_all_versions (struct link_map *map, int verbose,
986 int trace_mode) attribute_hidden;
987
988/* Check the version dependencies for MAP. If VERBOSE print some more
989 diagnostics. */
990extern int _dl_check_map_versions (struct link_map *map, int verbose,
991 int trace_mode) attribute_hidden;
992
993/* Initialize the object in SCOPE by calling the constructors with
994 ARGC, ARGV, and ENV as the parameters. */
995extern void _dl_init (struct link_map *main_map, int argc, char **argv,
996 char **env) attribute_hidden;
997
998/* Call the finalizer functions of all shared objects whose
999 initializer functions have completed. */
1000extern void _dl_fini (void) attribute_hidden;
1001
1002/* Sort array MAPS according to dependencies of the contained objects. */
1003extern void _dl_sort_maps (struct link_map **maps, unsigned int nmaps,
1004 char *used, bool for_fini) attribute_hidden;
1005
1006/* The dynamic linker calls this function before and having changing
1007 any shared object mappings. The `r_state' member of `struct r_debug'
1008 says what change is taking place. This function's address is
1009 the value of the `r_brk' member. */
1010extern void _dl_debug_state (void);
1011rtld_hidden_proto (_dl_debug_state)
1012
1013/* Initialize `struct r_debug' if it has not already been done. The
1014 argument is the run-time load address of the dynamic linker, to be put
1015 in the `r_ldbase' member. Returns the address of the structure. */
1016extern struct r_debug *_dl_debug_initialize (ElfW(Addr) ldbase, Lmid_t ns)
1017 attribute_hidden;
1018
1019/* Initialize the basic data structure for the search paths. */
1020extern void _dl_init_paths (const char *library_path) attribute_hidden;
1021
1022/* Gather the information needed to install the profiling tables and start
1023 the timers. */
1024extern void _dl_start_profile (void) attribute_hidden;
1025
1026/* The actual functions used to keep book on the calls. */
1027extern void _dl_mcount (ElfW(Addr) frompc, ElfW(Addr) selfpc);
1028rtld_hidden_proto (_dl_mcount)
1029
1030/* This function is simply a wrapper around the _dl_mcount function
1031 which does not require a FROMPC parameter since this is the
1032 calling function. */
1033extern void _dl_mcount_wrapper (void *selfpc);
1034
1035/* Show the members of the auxiliary array passed up from the kernel. */
1036extern void _dl_show_auxv (void) attribute_hidden;
1037
1038/* Return all environment variables starting with `LD_', one after the
1039 other. */
1040extern char *_dl_next_ld_env_entry (char ***position) attribute_hidden;
1041
1042/* Return an array with the names of the important hardware capabilities. */
1043extern const struct r_strlenpair *_dl_important_hwcaps (const char *platform,
1044 size_t paltform_len,
1045 size_t *sz,
1046 size_t *max_capstrlen)
1047 attribute_hidden;
1048
1049/* Look up NAME in ld.so.cache and return the file name stored there,
1050 or null if none is found. Caller must free returned string. */
1051extern char *_dl_load_cache_lookup (const char *name) attribute_hidden;
1052
1053/* If the system does not support MAP_COPY we cannot leave the file open
1054 all the time since this would create problems when the file is replaced.
1055 Therefore we provide this function to close the file and open it again
1056 once needed. */
1057extern void _dl_unload_cache (void) attribute_hidden;
1058
1059/* System-dependent function to read a file's whole contents in the
1060 most convenient manner available. *SIZEP gets the size of the
1061 file. On error MAP_FAILED is returned. */
1062extern void *_dl_sysdep_read_whole_file (const char *file, size_t *sizep,
1063 int prot) attribute_hidden;
1064
1065/* System-specific function to do initial startup for the dynamic linker.
1066 After this, file access calls and getenv must work. This is responsible
1067 for setting __libc_enable_secure if we need to be secure (e.g. setuid),
1068 and for setting _dl_argc and _dl_argv, and then calling _dl_main. */
1069extern ElfW(Addr) _dl_sysdep_start (void **start_argptr,
1070 void (*dl_main) (const ElfW(Phdr) *phdr,
1071 ElfW(Word) phnum,
1072 ElfW(Addr) *user_entry,
1073 ElfW(auxv_t) *auxv))
1074 attribute_hidden;
1075
1076extern void _dl_sysdep_start_cleanup (void) attribute_hidden;
1077
1078
1079/* Determine next available module ID. */
1080extern size_t _dl_next_tls_modid (void) attribute_hidden;
1081
1082/* Count the modules with TLS segments. */
1083extern size_t _dl_count_modids (void) attribute_hidden;
1084
1085/* Calculate offset of the TLS blocks in the static TLS block. */
1086extern void _dl_determine_tlsoffset (void) attribute_hidden;
1087
1088#ifndef SHARED
1089/* Set up the TCB for statically linked applications. This is called
1090 early during startup because we always use TLS (for errno and the
1091 stack protector, among other things). */
1092void __libc_setup_tls (void);
1093
1094# if ENABLE_STATIC_PIE
1095/* Relocate static executable with PIE. */
1096extern void _dl_relocate_static_pie (void) attribute_hidden;
1097
1098/* Get a pointer to _dl_main_map. */
1099extern struct link_map * _dl_get_dl_main_map (void)
1100 __attribute__ ((visibility ("hidden")));
1101# else
1102# define _dl_relocate_static_pie()
1103# endif
1104#endif
1105
1106/* Initialization of libpthread for statically linked applications.
1107 If libpthread is not linked in, this is an empty function. */
1108void __pthread_initialize_minimal (void) weak_function;
1109
1110/* Allocate memory for static TLS block (unless MEM is nonzero) and dtv. */
1111extern void *_dl_allocate_tls (void *mem);
1112rtld_hidden_proto (_dl_allocate_tls)
1113
1114/* Get size and alignment requirements of the static TLS block. */
1115extern void _dl_get_tls_static_info (size_t *sizep, size_t *alignp);
1116
1117extern void _dl_allocate_static_tls (struct link_map *map) attribute_hidden;
1118
1119/* These are internal entry points to the two halves of _dl_allocate_tls,
1120 only used within rtld.c itself at startup time. */
1121extern void *_dl_allocate_tls_storage (void) attribute_hidden;
1122extern void *_dl_allocate_tls_init (void *);
1123rtld_hidden_proto (_dl_allocate_tls_init)
1124
1125/* Deallocate memory allocated with _dl_allocate_tls. */
1126extern void _dl_deallocate_tls (void *tcb, bool dealloc_tcb);
1127rtld_hidden_proto (_dl_deallocate_tls)
1128
1129extern void _dl_nothread_init_static_tls (struct link_map *) attribute_hidden;
1130
1131/* Find origin of the executable. */
1132extern const char *_dl_get_origin (void) attribute_hidden;
1133
1134/* Count DSTs. */
1135extern size_t _dl_dst_count (const char *name) attribute_hidden;
1136
1137/* Substitute DST values. */
1138extern char *_dl_dst_substitute (struct link_map *l, const char *name,
1139 char *result) attribute_hidden;
1140
1141/* Open the shared object NAME, relocate it, and run its initializer if it
1142 hasn't already been run. MODE is as for `dlopen' (see <dlfcn.h>). If
1143 the object is already opened, returns its existing map. */
1144extern void *_dl_open (const char *name, int mode, const void *caller,
1145 Lmid_t nsid, int argc, char *argv[], char *env[])
1146 attribute_hidden;
1147
1148/* Free or queue for freeing scope OLD. If other threads might be
1149 in the middle of _dl_fixup, _dl_profile_fixup or dl*sym using the
1150 old scope, OLD can't be freed until no thread is using it. */
1151extern int _dl_scope_free (void *) attribute_hidden;
1152
1153
1154/* Add module to slot information data. If DO_ADD is false, only the
1155 required memory is allocated. Must be called with GL
1156 (dl_load_lock) acquired. If the function has already been called
1157 for the link map L with !do_add, then this function will not raise
1158 an exception, otherwise it is possible that it encounters a memory
1159 allocation failure. */
1160extern void _dl_add_to_slotinfo (struct link_map *l, bool do_add)
1161 attribute_hidden;
1162
1163/* Update slot information data for at least the generation of the
1164 module with the given index. */
1165extern struct link_map *_dl_update_slotinfo (unsigned long int req_modid)
1166 attribute_hidden;
1167
1168/* Look up the module's TLS block as for __tls_get_addr,
1169 but never touch anything. Return null if it's not allocated yet. */
1170extern void *_dl_tls_get_addr_soft (struct link_map *l) attribute_hidden;
1171
1172extern int _dl_addr_inside_object (struct link_map *l, const ElfW(Addr) addr)
1173 attribute_hidden;
1174
1175/* Show show of an object. */
1176extern void _dl_show_scope (struct link_map *new, int from)
1177 attribute_hidden;
1178
1179extern struct link_map *_dl_find_dso_for_object (const ElfW(Addr) addr);
1180rtld_hidden_proto (_dl_find_dso_for_object)
1181
1182/* Initialization which is normally done by the dynamic linker. */
1183extern void _dl_non_dynamic_init (void)
1184 attribute_hidden;
1185
1186/* Used by static binaries to check the auxiliary vector. */
1187extern void _dl_aux_init (ElfW(auxv_t) *av)
1188 attribute_hidden;
1189
1190/* Return true if the ld.so copy in this namespace is actually active
1191 and working. If false, the dl_open/dlfcn hooks have to be used to
1192 call into the outer dynamic linker (which happens after static
1193 dlopen). */
1194#ifdef SHARED
1195static inline bool
1196rtld_active (void)
1197{
1198 /* The default-initialized variable does not have a non-zero
1199 dl_init_all_dirs member, so this allows us to recognize an
1200 initialized and active ld.so copy. */
1201 return GLRO(dl_init_all_dirs) != NULL;
1202}
1203
1204static inline struct auditstate *
1205link_map_audit_state (struct link_map *l, size_t index)
1206{
1207 if (l == &GL (dl_rtld_map))
1208 /* The auditstate array is stored separately. */
1209 return &GL (dl_rtld_auditstate) [index];
1210 else
1211 {
1212 /* The auditstate array follows the link map in memory. */
1213 struct auditstate *base = (struct auditstate *) (l + 1);
1214 return &base[index];
1215 }
1216}
1217#endif /* SHARED */
1218
1219__END_DECLS
1220
1221#endif /* ldsodefs.h */
1222