1 /* Run-time dynamic linker data structures for loaded ELF shared objects.
2 Copyright (C) 1995-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
33 #include <fpu_control.h>
36 #include <dl-lookupcfg.h>
37 #include <dl-sysdep.h>
38 #include <dl-fixup-attribute.h>
39 #include <libc-lock.h>
40 #include <hp-timing.h>
46 #define VERSYMIDX(sym) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGIDX (sym))
47 #define VALIDX(tag) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM \
48 + DT_EXTRANUM + DT_VALTAGIDX (tag))
49 #define ADDRIDX(tag) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM \
50 + DT_EXTRANUM + DT_VALNUM + DT_ADDRTAGIDX (tag))
52 /* Type of GNU hash which the machine uses. */
53 #ifndef ELF_MACHINE_GNU_HASH_ADDRIDX
54 # define ELF_MACHINE_GNU_HASH_ADDRIDX ADDRIDX (DT_GNU_HASH)
57 /* Calculate the index of a symbol in GNU hash. */
58 #ifndef ELF_MACHINE_HASH_SYMIDX
59 # define ELF_MACHINE_HASH_SYMIDX(map, hasharr) \
60 ((hasharr) - (map)->l_gnu_chain_zero)
63 /* Setup MIPS xhash. Defined only for MIPS. */
64 #ifndef ELF_MACHINE_XHASH_SETUP
65 # define ELF_MACHINE_XHASH_SETUP(hash32, symbias, map) \
66 ((void) (hash32), (void) (symbias), (void) (map))
69 /* We use this macro to refer to ELF types independent of the native wordsize.
70 `ElfW(TYPE)' is used in place of `Elf32_TYPE' or `Elf64_TYPE'. */
71 #define ELFW(type) _ElfW (ELF, __ELF_NATIVE_CLASS, type)
73 /* Return true if dynamic section in the shared library L should be
77 dl_relocate_ld (const struct link_map
*l
)
79 /* Don't relocate dynamic section if it is readonly */
80 return !(l
->l_ld_readonly
|| DL_RO_DYN_SECTION
);
83 /* All references to the value of l_info[DT_PLTGOT],
84 l_info[DT_STRTAB], l_info[DT_SYMTAB], l_info[DT_RELA],
85 l_info[DT_REL], l_info[DT_JMPREL], and l_info[VERSYMIDX (DT_VERSYM)]
86 have to be accessed via the D_PTR macro. The macro is needed since for
87 most architectures the entry is already relocated - but for some not
88 and we need to relocate at access time. */
89 #define D_PTR(map, i) \
90 ((map)->i->d_un.d_ptr + (dl_relocate_ld (map) ? 0 : (map)->l_addr))
92 /* Result of the lookup functions and how to retrieve the base address. */
93 typedef struct link_map
*lookup_t
;
94 #define LOOKUP_VALUE(map) map
95 #define LOOKUP_VALUE_ADDRESS(map, set) ((set) || (map) ? (map)->l_addr : 0)
97 /* Calculate the address of symbol REF using the base address from map MAP,
98 if non-NULL. Don't check for NULL map if MAP_SET is TRUE. */
99 #define SYMBOL_ADDRESS(map, ref, map_set) \
101 : (__glibc_unlikely ((ref)->st_shndx == SHN_ABS) ? 0 \
102 : LOOKUP_VALUE_ADDRESS (map, map_set)) + (ref)->st_value)
104 /* Type of a constructor function, in DT_INIT, DT_INIT_ARRAY,
106 typedef void (*dl_init_t
) (int, char **, char **);
108 /* Type of a constructor function, in DT_FINI, DT_FINI_ARRAY. */
109 typedef void (*fini_t
) (void);
111 /* On some architectures a pointer to a function is not just a pointer
112 to the actual code of the function but rather an architecture
113 specific descriptor. */
114 #ifndef ELF_FUNCTION_PTR_IS_SPECIAL
115 # define DL_SYMBOL_ADDRESS(map, ref) \
116 (void *) SYMBOL_ADDRESS (map, ref, false)
117 # define DL_LOOKUP_ADDRESS(addr) ((ElfW(Addr)) (addr))
118 # define DL_CALL_DT_INIT(map, start, argc, argv, env) \
119 ((dl_init_t) (start)) (argc, argv, env)
120 # define DL_CALL_DT_FINI(map, start) ((fini_t) (start)) ()
123 /* On some architectures dladdr can't use st_size of all symbols this way. */
124 #define DL_ADDR_SYM_MATCH(L, SYM, MATCHSYM, ADDR) \
125 ((ADDR) >= (L)->l_addr + (SYM)->st_value \
126 && ((((SYM)->st_shndx == SHN_UNDEF || (SYM)->st_size == 0) \
127 && (ADDR) == (L)->l_addr + (SYM)->st_value) \
128 || (ADDR) < (L)->l_addr + (SYM)->st_value + (SYM)->st_size) \
129 && ((MATCHSYM) == NULL || (MATCHSYM)->st_value < (SYM)->st_value))
131 /* According to the ELF gABI no STV_HIDDEN or STV_INTERNAL symbols are
132 expected to be present in dynamic symbol tables as they should have
133 been either removed or converted to STB_LOCAL binding by the static
134 linker. However some GNU binutils versions produce such symbols in
135 some cases. To prevent such symbols present in a buggy binary from
136 preempting global symbols we filter them out with this predicate. */
137 static __always_inline
bool
138 dl_symbol_visibility_binds_local_p (const ElfW(Sym
) *sym
)
140 return (ELFW(ST_VISIBILITY
) (sym
->st_other
) == STV_HIDDEN
141 || ELFW(ST_VISIBILITY
) (sym
->st_other
) == STV_INTERNAL
);
144 /* Unmap a loaded object, called by _dl_close (). */
145 #ifndef DL_UNMAP_IS_SPECIAL
146 # define DL_UNMAP(map) _dl_unmap_segments (map)
149 /* Reloc type classes as returned by elf_machine_type_class().
150 ELF_RTYPE_CLASS_PLT means this reloc should not be satisfied by
151 some PLT symbol, ELF_RTYPE_CLASS_COPY means this reloc should not be
152 satisfied by any symbol in the executable. Some architectures do
153 not support copy relocations. In this case we define the macro to
154 zero so that the code for handling them gets automatically optimized
156 #define ELF_RTYPE_CLASS_PLT 1
157 #ifndef DL_NO_COPY_RELOCS
158 # define ELF_RTYPE_CLASS_COPY 2
160 # define ELF_RTYPE_CLASS_COPY 0
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. */
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)))
176 /* The filename itself, or the main program name, if available. */
177 #define DSO_FILENAME(name) ((name)[0] ? (name) \
178 : (rtld_progname ?: "<main program>"))
180 #define RTLD_PROGNAME (rtld_progname ?: "<program name unknown>")
182 /* For the version handling we need an array with only names and their
184 struct r_found_version
190 const char *filename
;
193 /* We want to cache information about the searches for shared objects. */
195 enum r_dir_status
{ unknown
, nonexisting
, existing
};
197 struct r_search_path_elem
199 /* This link is only used in the `all_dirs' member of `r_search_path'. */
200 struct r_search_path_elem
*next
;
202 /* Strings saying where the definition came from. */
206 /* Basename for this search path element. The string must end with
207 a slash character. */
211 enum r_dir_status status
[0];
221 /* A data structure for a simple single linked list of strings. */
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. */
231 /* DSO sort algorithm to use (check dl-sort-maps.c). */
232 enum dso_sort_algorithm
234 dso_sort_algorithm_original
,
235 dso_sort_algorithm_dfs
240 void (*activity
) (uintptr_t *, unsigned int);
241 char *(*objsearch
) (const char *, uintptr_t *, unsigned int);
242 unsigned int (*objopen
) (struct link_map
*, Lmid_t
, uintptr_t *);
243 void (*preinit
) (uintptr_t *);
246 uintptr_t (*symbind32
) (Elf32_Sym
*, unsigned int, uintptr_t *,
247 uintptr_t *, unsigned int *, const char *);
248 uintptr_t (*symbind64
) (Elf64_Sym
*, unsigned int, uintptr_t *,
249 uintptr_t *, unsigned int *, const char *);
253 #ifdef ARCH_PLTENTER_MEMBERS
254 ARCH_PLTENTER_MEMBERS
;
259 #ifdef ARCH_PLTEXIT_MEMBERS
260 ARCH_PLTEXIT_MEMBERS
;
263 unsigned int (*objclose
) (uintptr_t *);
265 struct audit_ifaces
*next
;
269 /* Test whether given NAME matches any of the names of the given object. */
270 extern int _dl_name_match_p (const char *__name
, const struct link_map
*__map
)
273 /* Compute next higher prime number. */
274 extern unsigned long int _dl_higher_prime_number (unsigned long int n
)
277 /* A stripped down strtoul-like implementation. */
278 uint64_t _dl_strtoul (const char *, char **) attribute_hidden
;
280 /* Function used as argument for `_dl_receive_error' function. The
281 arguments are the error code, error string, and the objname the
282 error occurred in. */
283 typedef void (*receiver_fct
) (int, const char *, const char *);
285 /* Internal functions of the run-time dynamic linker.
286 These can be accessed if you link again the dynamic linker
287 as a shared library, as in `-lld' or `/lib/ld.so' explicitly;
288 but are not normally of interest to user programs.
290 The `-ldl' library functions in <dlfcn.h> provide a simple
291 user interface to run-time dynamic linking. */
295 # define EXTERN extern
296 # define GL(name) _##name
300 # define GL(name) _rtld_local._##name
302 # define GL(name) _rtld_global._##name
307 /* Don't change the order of the following elements. 'dl_loaded'
308 must remain the first element. Forever. */
310 /* Non-shared code has no support for multiple namespaces. */
316 EXTERN
struct link_namespaces
318 /* A pointer to the map for the main map. */
319 struct link_map
*_ns_loaded
;
320 /* Number of object in the _dl_loaded list. */
321 unsigned int _ns_nloaded
;
322 /* Direct pointer to the searchlist of the main object. */
323 struct r_scope_elem
*_ns_main_searchlist
;
324 /* This is zero at program start to signal that the global scope map is
325 allocated by rtld. Later it keeps the size of the map. It might be
326 reset if in _dl_close if the last global object is removed. */
327 unsigned int _ns_global_scope_alloc
;
329 /* During dlopen, this is the number of objects that still need to
330 be added to the global scope map. It has to be taken into
331 account when resizing the map, for future map additions after
332 recursive dlopen calls from ELF constructors. */
333 unsigned int _ns_global_scope_pending_adds
;
335 /* Once libc.so has been loaded into the namespace, this points to
337 struct link_map
*libc_map
;
339 /* Search table for unique objects. */
340 struct unique_sym_table
342 __rtld_lock_define_recursive (, lock
)
347 const ElfW(Sym
) *sym
;
348 const struct link_map
*map
;
352 void (*free
) (void *);
353 } _ns_unique_sym_table
;
354 /* Keep track of changes to each namespace' list. */
355 struct r_debug_extended _ns_debug
;
357 /* One higher than index of last used namespace. */
358 EXTERN
size_t _dl_nns
;
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.
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
371 __rtld_lock_define_recursive (EXTERN
, _dl_load_write_lock
)
372 /* This lock protects global and module specific TLS related data.
373 E.g. it is held in dlopen and dlclose when GL(dl_tls_generation),
374 GL(dl_tls_max_dtv_idx) or GL(dl_tls_dtv_slotinfo_list) are
375 accessed and when TLS related relocations are processed for a
376 module. It was introduced to keep pthread_create accessing TLS
377 state that is being set up. */
378 __rtld_lock_define_recursive (EXTERN
, _dl_load_tls_lock
)
380 /* Incremented whenever something may have been added to dl_loaded. */
381 EXTERN
unsigned long long _dl_load_adds
;
383 /* The object to be initialized first. */
384 EXTERN
struct link_map
*_dl_initfirst
;
386 /* Map of shared object to be profiled. */
387 EXTERN
struct link_map
*_dl_profile_map
;
389 /* Counters for the number of relocations performed. */
390 EXTERN
unsigned long int _dl_num_relocations
;
391 EXTERN
unsigned long int _dl_num_cache_relocations
;
393 /* List of search directories. */
394 EXTERN
struct r_search_path_elem
*_dl_all_dirs
;
396 /* Structure describing the dynamic linker itself. */
397 EXTERN
struct link_map _dl_rtld_map
;
399 /* Used to store the audit information for the link map of the
401 struct auditstate _dl_rtld_auditstate
[DL_NNS
];
404 #if !PTHREAD_IN_LIBC && defined SHARED \
405 && defined __rtld_lock_default_lock_recursive
406 EXTERN
void (*_dl_rtld_lock_recursive
) (void *);
407 EXTERN
void (*_dl_rtld_unlock_recursive
) (void *);
410 /* Get architecture specific definitions. */
411 #define PROCINFO_DECL
412 #ifndef PROCINFO_CLASS
413 # define PROCINFO_CLASS EXTERN
415 #include <dl-procruntime.c>
418 /* If loading a shared object requires that we make the stack executable
419 when it was not, we do it by calling this function.
420 It returns an errno code or zero on success. */
421 EXTERN
int (*_dl_make_stack_executable_hook
) (void **);
424 /* Prevailing state of the stack, PF_X indicating it's executable. */
425 EXTERN
ElfW(Word
) _dl_stack_flags
;
427 /* Flag signalling whether there are gaps in the module ID allocation. */
428 EXTERN
bool _dl_tls_dtv_gaps
;
429 /* Highest dtv index currently needed. */
430 EXTERN
size_t _dl_tls_max_dtv_idx
;
431 /* Information about the dtv slots. */
432 EXTERN
struct dtv_slotinfo_list
435 struct dtv_slotinfo_list
*next
;
439 struct link_map
*map
;
441 } *_dl_tls_dtv_slotinfo_list
;
442 /* Number of modules in the static TLS block. */
443 EXTERN
size_t _dl_tls_static_nelem
;
444 /* Size actually allocated in the static TLS block. */
445 EXTERN
size_t _dl_tls_static_used
;
446 /* Remaining amount of static TLS that may be used for optimizing
447 dynamic TLS access (e.g. with TLSDESC). */
448 EXTERN
size_t _dl_tls_static_optional
;
450 /* Number of additional entries in the slotinfo array of each slotinfo
451 list element. A large number makes it almost certain take we never
452 have to iterate beyond the first element in the slotinfo list. */
453 #define TLS_SLOTINFO_SURPLUS (62)
455 /* Number of additional slots in the dtv allocated. */
456 #define DTV_SURPLUS (14)
458 /* Initial dtv of the main thread, not allocated with normal malloc. */
459 EXTERN
void *_dl_initial_dtv
;
460 /* Generation counter for the dtv. */
461 EXTERN
size_t _dl_tls_generation
;
464 EXTERN
void (*_dl_init_static_tls
) (struct link_map
*);
467 /* Scopes to free after next THREAD_GSCOPE_WAIT (). */
468 EXTERN
struct dl_scope_free_list
472 } *_dl_scope_free_list
;
474 /* List of active thread stacks, with memory managed by glibc. */
475 EXTERN list_t _dl_stack_used
;
477 /* List of thread stacks that were allocated by the application. */
478 EXTERN list_t _dl_stack_user
;
480 /* List of queued thread stacks. */
481 EXTERN list_t _dl_stack_cache
;
483 /* Total size of all stacks in the cache (sum over stackblock_size). */
484 EXTERN
size_t _dl_stack_cache_actsize
;
486 /* We need to record what list operations we are going to do so
487 that, in case of an asynchronous interruption due to a fork()
488 call, we can correct for the work. */
489 EXTERN
uintptr_t _dl_in_flight_stack
;
491 /* Mutex protecting the stack lists. */
492 EXTERN
int _dl_stack_cache_lock
;
494 /* The total number of thread IDs currently in use, or on the list of
495 available thread IDs. */
496 EXTERN
int _dl_pthread_num_threads
;
498 /* Array of __pthread structures and its lock. */
499 EXTERN
struct __pthread
**_dl_pthread_threads
;
500 __libc_rwlock_define (EXTERN
, _dl_pthread_threads_lock
)
504 # define __rtld_global_attribute__
506 # ifdef HAVE_SDATA_SECTION
507 # define __rtld_local_attribute__ \
508 __attribute__ ((visibility ("hidden"), section (".sdata")))
509 # undef __rtld_global_attribute__
510 # define __rtld_global_attribute__ __attribute__ ((section (".sdata")))
512 # define __rtld_local_attribute__ __attribute__ ((visibility ("hidden")))
514 extern struct rtld_global _rtld_local __rtld_local_attribute__
;
515 # undef __rtld_local_attribute__
517 extern struct rtld_global _rtld_global __rtld_global_attribute__
;
518 # undef __rtld_global_attribute__
522 # define GLRO(name) _##name
525 # define GLRO(name) _rtld_local_ro._##name
527 # define GLRO(name) _rtld_global_ro._##name
529 struct rtld_global_ro
533 /* If nonzero the appropriate debug information is printed. */
534 EXTERN
int _dl_debug_mask
;
535 #define DL_DEBUG_LIBS (1 << 0)
536 #define DL_DEBUG_IMPCALLS (1 << 1)
537 #define DL_DEBUG_BINDINGS (1 << 2)
538 #define DL_DEBUG_SYMBOLS (1 << 3)
539 #define DL_DEBUG_VERSIONS (1 << 4)
540 #define DL_DEBUG_RELOC (1 << 5)
541 #define DL_DEBUG_FILES (1 << 6)
542 #define DL_DEBUG_STATISTICS (1 << 7)
543 #define DL_DEBUG_UNUSED (1 << 8)
544 #define DL_DEBUG_SCOPES (1 << 9)
545 /* These two are used only internally. */
546 #define DL_DEBUG_HELP (1 << 10)
549 EXTERN
const char *_dl_platform
;
550 EXTERN
size_t _dl_platformlen
;
552 /* Cached value of `getpagesize ()'. */
553 EXTERN
size_t _dl_pagesize
;
555 /* Cached value of `sysconf (_SC_MINSIGSTKSZ)'. */
556 EXTERN
size_t _dl_minsigstacksize
;
558 /* Do we read from ld.so.cache? */
559 EXTERN
int _dl_inhibit_cache
;
561 /* Copy of the content of `_dl_main_searchlist' at startup time. */
562 EXTERN
struct r_scope_elem _dl_initial_searchlist
;
564 /* CLK_TCK as reported by the kernel. */
565 EXTERN
int _dl_clktck
;
567 /* If nonzero print warnings messages. */
568 EXTERN
int _dl_verbose
;
570 /* File descriptor to write debug messages to. */
571 EXTERN
int _dl_debug_fd
;
573 /* Do we do lazy relocations? */
576 /* Nonzero if runtime lookups should not update the .got/.plt. */
577 EXTERN
int _dl_bind_not
;
579 /* Nonzero if references should be treated as weak during runtime
581 EXTERN
int _dl_dynamic_weak
;
583 /* Default floating-point control word. */
584 EXTERN fpu_control_t _dl_fpu_control
;
586 /* Mask for hardware capabilities that are available. */
587 EXTERN
uint64_t _dl_hwcap
;
590 /* Mask for important hardware capabilities we honour. */
591 EXTERN
uint64_t _dl_hwcap_mask
;
594 #ifdef HAVE_AUX_VECTOR
595 /* Pointer to the auxv list supplied to the program at startup. */
596 EXTERN
ElfW(auxv_t
) *_dl_auxv
;
599 /* Get architecture specific definitions. */
600 #include <dl-procinfo.c>
602 /* Names of shared object for which the RPATH should be ignored. */
603 EXTERN
const char *_dl_inhibit_rpath
;
605 /* Location of the binary. */
606 EXTERN
const char *_dl_origin_path
;
608 /* Size of the static TLS block. */
609 EXTERN
size_t _dl_tls_static_size
;
611 /* Alignment requirement of the static TLS block. */
612 EXTERN
size_t _dl_tls_static_align
;
614 /* Size of surplus space in the static TLS area for dynamically
615 loaded modules with IE-model TLS or for TLSDESC optimization.
616 See comments in elf/dl-tls.c where it is initialized. */
617 EXTERN
size_t _dl_tls_static_surplus
;
619 /* Name of the shared object to be profiled (if any). */
620 EXTERN
const char *_dl_profile
;
621 /* Filename of the output file. */
622 EXTERN
const char *_dl_profile_output
;
624 /* All search directories defined at startup. This is assigned a
625 non-NULL pointer by the ld.so startup code (after initialization
626 to NULL), so this can also serve as an indicator whether a copy
627 of ld.so is initialized and active. See the rtld_active function
629 EXTERN
struct r_search_path_elem
*_dl_init_all_dirs
;
631 #ifdef NEED_DL_SYSINFO
632 /* Syscall handling improvements. This is very specific to x86. */
633 EXTERN
uintptr_t _dl_sysinfo
;
636 #ifdef NEED_DL_SYSINFO_DSO
637 /* The vsyscall page is a virtual DSO pre-mapped by the kernel.
638 This points to its ELF header. */
639 EXTERN
const ElfW(Ehdr
) *_dl_sysinfo_dso
;
641 /* At startup time we set up the normal DSO data structure for it,
642 and this points to it. */
643 EXTERN
struct link_map
*_dl_sysinfo_map
;
645 # define PROCINFO_DECL
646 # ifndef PROCINFO_CLASS
647 # define PROCINFO_CLASS EXTERN
649 # include <dl-vdso-setup.c>
652 /* Mask for more hardware capabilities that are available on some
654 EXTERN
uint64_t _dl_hwcap2
;
656 EXTERN
enum dso_sort_algorithm _dl_dso_sort_algo
;
659 /* We add a function table to _rtld_global which is then used to
660 call the function instead of going through the PLT. The result
661 is that we can avoid exporting the functions and we do not jump
662 PLT relocations in libc.so. */
663 void (*_dl_debug_printf
) (const char *, ...)
664 __attribute__ ((__format__ (__printf__
, 1, 2)));
665 void (*_dl_mcount
) (ElfW(Addr
) frompc
, ElfW(Addr
) selfpc
);
666 lookup_t (*_dl_lookup_symbol_x
) (const char *, struct link_map
*,
667 const ElfW(Sym
) **, struct r_scope_elem
*[],
668 const struct r_found_version
*, int, int,
670 void *(*_dl_open
) (const char *file
, int mode
, const void *caller_dlopen
,
671 Lmid_t nsid
, int argc
, char *argv
[], char *env
[]);
672 void (*_dl_close
) (void *map
);
673 /* libdl in a secondary namespace (after dlopen) must use
674 _dl_catch_error from the main namespace, so it has to be
675 exported in some way. */
676 int (*_dl_catch_error
) (const char **objname
, const char **errstring
,
677 bool *mallocedp
, void (*operate
) (void *),
679 /* libdl in a secondary namespace must use free from the base
681 void (*_dl_error_free
) (void *);
682 void *(*_dl_tls_get_addr_soft
) (struct link_map
*);
684 /* Called from __libc_shared to deallocate malloc'ed memory. */
685 void (*_dl_libc_freeres
) (void);
687 /* Implementation of _dl_find_object. The public entry point is in
688 libc, and this is patched by __rtld_static_init to support static
690 int (*_dl_find_object
) (void *, struct dl_find_object
*);
692 /* Dynamic linker operations used after static dlopen. */
693 const struct dlfcn_hook
*_dl_dlfcn_hook
;
695 /* List of auditing interfaces. */
696 struct audit_ifaces
*_dl_audit
;
697 unsigned int _dl_naudit
;
699 # define __rtld_global_attribute__
701 # define __rtld_local_attribute__ __attribute__ ((visibility ("hidden")))
702 extern struct rtld_global_ro _rtld_local_ro
703 attribute_relro __rtld_local_attribute__
;
704 extern struct rtld_global_ro _rtld_global_ro
705 attribute_relro __rtld_global_attribute__
;
706 # undef __rtld_local_attribute__
708 /* We cheat a bit here. We declare the variable as as const even
709 though it is at startup. */
710 extern const struct rtld_global_ro _rtld_global_ro
711 attribute_relro __rtld_global_attribute__
;
713 # undef __rtld_global_attribute__
718 /* dl-support.c defines these and initializes them early on. */
719 extern const ElfW(Phdr
) *_dl_phdr
;
720 extern size_t _dl_phnum
;
724 /* This function changes the permissions of all stacks (not just those
725 of the main stack). */
726 int _dl_make_stacks_executable (void **stack_endp
) attribute_hidden
;
728 /* This is the initial value of GL(dl_make_stack_executable_hook).
729 A threads library can change it. The ld.so implementation changes
730 the permissions of the main stack only. */
731 extern int _dl_make_stack_executable (void **stack_endp
);
732 rtld_hidden_proto (_dl_make_stack_executable
)
735 /* Variable pointing to the end of the stack (or close to it). This value
736 must be constant over the runtime of the application. Some programs
737 might use the variable which results in copy relocations on some
738 platforms. But this does not matter, ld.so can always use the local
740 extern void *__libc_stack_end
741 #ifndef LIBC_STACK_END_NOT_RELRO
745 rtld_hidden_proto (__libc_stack_end
)
747 /* Parameters passed to the dynamic linker. */
748 extern int _dl_argc attribute_hidden attribute_relro
;
749 extern char **_dl_argv attribute_relro
;
750 rtld_hidden_proto (_dl_argv
)
751 #define rtld_progname _dl_argv[0]
753 /* Flag set at startup and cleared when the last initializer has run. */
754 extern int _dl_starting_up
;
755 weak_extern (_dl_starting_up
)
756 rtld_hidden_proto (_dl_starting_up
)
758 /* Random data provided by the kernel. */
759 extern void *_dl_random attribute_hidden attribute_relro
;
761 /* Write message on the debug file descriptor. The parameters are
762 interpreted as for a `printf' call. All the lines start with a
763 tag showing the PID. */
764 extern void _dl_debug_printf (const char *fmt
, ...)
765 __attribute__ ((__format__ (__printf__
, 1, 2))) attribute_hidden
;
767 /* Write message on the debug file descriptor. The parameters are
768 interpreted as for a `printf' call. All the lines buf the first
769 start with a tag showing the PID. */
770 extern void _dl_debug_printf_c (const char *fmt
, ...)
771 __attribute__ ((__format__ (__printf__
, 1, 2))) attribute_hidden
;
774 /* Write a message on the specified descriptor FD. The parameters are
775 interpreted as for a `printf' call. */
776 extern void _dl_dprintf (int fd
, const char *fmt
, ...)
777 __attribute__ ((__format__ (__printf__
, 2, 3)))
780 /* Write LENGTH bytes at BUFFER to FD, like write. Returns the number
781 of bytes written on success, or a negative error constant on
783 ssize_t
_dl_write (int fd
, const void *buffer
, size_t length
)
786 /* Write a message on the specified descriptor standard output. The
787 parameters are interpreted as for a `printf' call. */
788 void _dl_printf (const char *fmt
, ...)
789 attribute_hidden
__attribute__ ((__format__ (__printf__
, 1, 2)));
791 /* Write a message on the specified descriptor standard error. The
792 parameters are interpreted as for a `printf' call. */
793 void _dl_error_printf (const char *fmt
, ...)
794 attribute_hidden
__attribute__ ((__format__ (__printf__
, 1, 2)));
796 /* Write a message on the specified descriptor standard error and exit
797 the program. The parameters are interpreted as for a `printf' call. */
798 void _dl_fatal_printf (const char *fmt
, ...)
799 __attribute__ ((__format__ (__printf__
, 1, 2), __noreturn__
));
800 rtld_hidden_proto (_dl_fatal_printf
)
802 /* An exception raised by the _dl_signal_error function family and
803 caught by _dl_catch_error function family. Exceptions themselves
804 are copied as part of the raise operation, but the strings are
809 const char *errstring
;
811 /* This buffer typically stores both objname and errstring
813 char *message_buffer
;
816 /* Creates a new exception. This calls malloc; if allocation fails,
817 dummy values are inserted. OBJECT is the name of the problematical
818 shared object, or null if its a general problem. ERRSTRING is a
819 string describing the specific problem. */
820 void _dl_exception_create (struct dl_exception
*, const char *object
,
821 const char *errstring
)
822 __attribute__ ((nonnull (1, 3)));
823 rtld_hidden_proto (_dl_exception_create
)
825 /* Used internally to implement dlerror message freeing. See
826 include/dlfcn.h and dlfcn/dlerror.c. */
827 void _dl_error_free (void *ptr
) attribute_hidden
;
829 /* Like _dl_exception_create, but create errstring from a format
830 string FMT. Currently, only "%s" and "%%" are supported as format
832 void _dl_exception_create_format (struct dl_exception
*, const char *objname
,
833 const char *fmt
, ...)
834 __attribute__ ((nonnull (1, 3), format (printf
, 3, 4)));
835 rtld_hidden_proto (_dl_exception_create_format
)
837 /* Deallocate the exception, freeing allocated buffers (if
839 void _dl_exception_free (struct dl_exception
*)
840 __attribute__ ((nonnull (1)));
841 rtld_hidden_proto (_dl_exception_free
)
843 /* This function is called by all the internal dynamic linker
844 functions when they encounter an error. ERRCODE is either an
845 `errno' code or zero; it specifies the return value of
846 _dl_catch_error. OCCASION is included in the error message if the
847 process is terminated immediately. */
848 void _dl_signal_exception (int errcode
, struct dl_exception
*,
849 const char *occasion
)
850 __attribute__ ((__noreturn__
));
851 rtld_hidden_proto (_dl_signal_exception
)
853 /* Like _dl_signal_exception, but creates the exception first. */
854 extern void _dl_signal_error (int errcode
, const char *object
,
855 const char *occasion
, const char *errstring
)
856 __attribute__ ((__noreturn__
));
857 rtld_hidden_proto (_dl_signal_error
)
859 /* Like _dl_signal_exception, but may return when called in the
860 context of _dl_receive_error. This is only used during ld.so
861 bootstrap. In static and profiled builds, this is equivalent to
862 _dl_signal_exception. */
864 extern void _dl_signal_cexception (int errcode
, struct dl_exception
*,
865 const char *occasion
) attribute_hidden
;
867 __attribute__ ((always_inline
))
869 _dl_signal_cexception (int errcode
, struct dl_exception
*exception
,
870 const char *occasion
)
872 _dl_signal_exception (errcode
, exception
, occasion
);
876 /* See _dl_signal_cexception above. */
878 extern void _dl_signal_cerror (int errcode
, const char *object
,
879 const char *occasion
, const char *errstring
)
882 __attribute__ ((always_inline
))
884 _dl_signal_cerror (int errcode
, const char *object
,
885 const char *occasion
, const char *errstring
)
887 _dl_signal_error (errcode
, object
, occasion
, errstring
);
891 /* Call OPERATE, receiving errors from `dl_signal_cerror'. Unlike
892 `_dl_catch_error' the operation is resumed after the OPERATE
894 ARGS is passed as argument to OPERATE. */
895 extern void _dl_receive_error (receiver_fct fct
, void (*operate
) (void *),
896 void *args
) attribute_hidden
;
898 /* Call OPERATE, catching errors from `_dl_signal_error' and related
899 functions. If there is no error, *ERRSTRING is set to null. If
900 there is an error, *ERRSTRING is set to a string constructed from
901 the strings passed to _dl_signal_error, and the error code passed
902 is the return value and *OBJNAME is set to the object name which
903 experienced the problems. ERRSTRING if nonzero points to a
904 malloc'ed string which the caller has to free after use. ARGS is
905 passed as argument to OPERATE. MALLOCEDP is set to true only if
906 the returned string is allocated using the libc's malloc. */
907 extern int _dl_catch_error (const char **objname
, const char **errstring
,
908 bool *mallocedp
, void (*operate
) (void *),
909 void *args
) attribute_hidden
;
911 /* Call OPERATE (ARGS). If no error occurs, set *EXCEPTION to zero.
912 Otherwise, store a copy of the raised exception in *EXCEPTION,
913 which has to be freed by _dl_exception_free. As a special case, if
914 EXCEPTION is null, call OPERATE (ARGS) with exception handling
915 disabled (so that exceptions are fatal). */
916 int _dl_catch_exception (struct dl_exception
*exception
,
917 void (*operate
) (void *), void *args
);
918 rtld_hidden_proto (_dl_catch_exception
)
920 /* Open the shared object NAME and map in its segments.
921 LOADER's DT_RPATH is used in searching for NAME.
922 If the object is already opened, returns its existing map. */
923 extern struct link_map
*_dl_map_object (struct link_map
*loader
,
925 int type
, int trace_mode
, int mode
,
926 Lmid_t nsid
) attribute_hidden
;
928 /* Call _dl_map_object on the dependencies of MAP, and set up
929 MAP->l_searchlist. PRELOADS points to a vector of NPRELOADS previously
930 loaded objects that will be inserted into MAP->l_searchlist after MAP
931 but before its dependencies. */
932 extern void _dl_map_object_deps (struct link_map
*map
,
933 struct link_map
**preloads
,
934 unsigned int npreloads
, int trace_mode
,
938 /* Cache the locations of MAP's hash table. */
939 extern void _dl_setup_hash (struct link_map
*map
) attribute_hidden
;
942 /* Collect the directories in the search path for LOADER's dependencies.
943 The data structure is defined in <dlfcn.h>. If COUNTING is true,
944 SI->dls_cnt and SI->dls_size are set; if false, those must be as set
945 by a previous call with COUNTING set, and SI must point to SI->dls_size
946 bytes to be used in filling in the result. */
947 extern void _dl_rtld_di_serinfo (struct link_map
*loader
,
948 Dl_serinfo
*si
, bool counting
);
950 /* Process PT_GNU_PROPERTY program header PH in module L after
951 PT_LOAD segments are mapped from file FD. */
952 void _dl_process_pt_gnu_property (struct link_map
*l
, int fd
,
953 const ElfW(Phdr
) *ph
);
956 /* Search loaded objects' symbol tables for a definition of the symbol
957 referred to by UNDEF. *SYM is the symbol table entry containing the
958 reference; it is replaced with the defining symbol, and the base load
959 address of the defining object is returned. SYMBOL_SCOPE is a
960 null-terminated list of object scopes to search; each object's
961 l_searchlist (i.e. the segment of the dependency tree starting at that
962 object) is searched in turn. REFERENCE_NAME should name the object
963 containing the reference; it is used in error messages.
964 TYPE_CLASS describes the type of symbol we are looking for. */
967 /* If necessary add dependency between user and provider object. */
968 DL_LOOKUP_ADD_DEPENDENCY
= 1,
969 /* Return most recent version instead of default version for
970 unversioned lookup. */
971 DL_LOOKUP_RETURN_NEWEST
= 2,
972 /* Set if dl_lookup* called with GSCOPE lock held. */
973 DL_LOOKUP_GSCOPE_LOCK
= 4,
974 /* Set if dl_lookup is called for non-lazy relocation processing
975 from _dl_relocate_object in elf/dl-reloc.c. */
976 DL_LOOKUP_FOR_RELOCATE
= 8,
979 /* Lookup versioned symbol. */
980 extern lookup_t
_dl_lookup_symbol_x (const char *undef
,
981 struct link_map
*undef_map
,
982 const ElfW(Sym
) **sym
,
983 struct r_scope_elem
*symbol_scope
[],
984 const struct r_found_version
*version
,
985 int type_class
, int flags
,
986 struct link_map
*skip_map
)
990 /* Restricted version of _dl_lookup_symbol_x. Searches MAP (and only
991 MAP) for the symbol UNDEF_NAME, with GNU hash NEW_HASH (computed
992 with dl_new_hash), symbol version VERSION, and symbol version hash
993 VERSION_HASH (computed with _dl_elf_hash). Returns a pointer to
994 the symbol table entry in MAP on success, or NULL on failure. MAP
995 must have symbol versioning information, or otherwise the result is
997 const ElfW(Sym
) *_dl_lookup_direct (struct link_map
*map
,
998 const char *undef_name
,
1000 const char *version
,
1001 uint32_t version_hash
) attribute_hidden
;
1003 /* Add the new link_map NEW to the end of the namespace list. */
1004 extern void _dl_add_to_namespace_list (struct link_map
*new, Lmid_t nsid
)
1007 /* Allocate a `struct link_map' for a new object being loaded. */
1008 extern struct link_map
*_dl_new_object (char *realname
, const char *libname
,
1009 int type
, struct link_map
*loader
,
1010 int mode
, Lmid_t nsid
)
1013 /* Relocate the given object (if it hasn't already been).
1014 SCOPE is passed to _dl_lookup_symbol in symbol lookups.
1015 If RTLD_LAZY is set in RELOC-MODE, don't relocate its PLT. */
1016 extern void _dl_relocate_object (struct link_map
*map
,
1017 struct r_scope_elem
*scope
[],
1018 int reloc_mode
, int consider_profiling
)
1021 /* Protect PT_GNU_RELRO area. */
1022 extern void _dl_protect_relro (struct link_map
*map
) attribute_hidden
;
1024 /* Call _dl_signal_error with a message about an unhandled reloc type.
1025 TYPE is the result of ELFW(R_TYPE) (r_info), i.e. an R_<CPU>_* value.
1026 PLT is nonzero if this was a PLT reloc; it just affects the message. */
1027 extern void _dl_reloc_bad_type (struct link_map
*map
,
1028 unsigned int type
, int plt
)
1029 attribute_hidden
__attribute__ ((__noreturn__
));
1031 /* Check the version dependencies of all objects available through
1032 MAP. If VERBOSE print some more diagnostics. */
1033 extern int _dl_check_all_versions (struct link_map
*map
, int verbose
,
1034 int trace_mode
) attribute_hidden
;
1036 /* Check the version dependencies for MAP. If VERBOSE print some more
1038 extern int _dl_check_map_versions (struct link_map
*map
, int verbose
,
1039 int trace_mode
) attribute_hidden
;
1041 /* Initialize the object in SCOPE by calling the constructors with
1042 ARGC, ARGV, and ENV as the parameters. */
1043 extern void _dl_init (struct link_map
*main_map
, int argc
, char **argv
,
1044 char **env
) attribute_hidden
;
1046 /* Call the finalizer functions of all shared objects whose
1047 initializer functions have completed. */
1048 extern void _dl_fini (void) attribute_hidden
;
1050 /* Invoke the DT_FINI_ARRAY and DT_FINI destructors for MAP, which
1051 must be a struct link_map *. Can be used as an argument to
1052 _dl_catch_exception. */
1053 void _dl_call_fini (void *map
) attribute_hidden
;
1055 /* Sort array MAPS according to dependencies of the contained objects.
1056 If FORCE_FIRST, MAPS[0] keeps its place even if the dependencies
1058 extern void _dl_sort_maps (struct link_map
**maps
, unsigned int nmaps
,
1059 bool force_first
, bool for_fini
) attribute_hidden
;
1061 /* The dynamic linker calls this function before and having changing
1062 any shared object mappings. The `r_state' member of `struct r_debug'
1063 says what change is taking place. This function's address is
1064 the value of the `r_brk' member. */
1065 extern void _dl_debug_state (void);
1066 rtld_hidden_proto (_dl_debug_state
)
1068 /* Initialize `struct r_debug_extended' for the namespace NS. LDBASE
1069 is the run-time load address of the dynamic linker, to be put in the
1070 `r_ldbase' member. Return the address of the structure. */
1071 extern struct r_debug
*_dl_debug_initialize (ElfW(Addr
) ldbase
, Lmid_t ns
)
1074 /* Update the `r_map' member and return the address of `struct r_debug'
1075 of the namespace NS. */
1076 extern struct r_debug
*_dl_debug_update (Lmid_t ns
) attribute_hidden
;
1078 /* Initialize the basic data structure for the search paths. SOURCE
1079 is either "LD_LIBRARY_PATH" or "--library-path".
1080 GLIBC_HWCAPS_PREPEND adds additional glibc-hwcaps subdirectories to
1081 search. GLIBC_HWCAPS_MASK is used to filter the built-in
1082 subdirectories if not NULL. */
1083 extern void _dl_init_paths (const char *library_path
, const char *source
,
1084 const char *glibc_hwcaps_prepend
,
1085 const char *glibc_hwcaps_mask
)
1088 /* Gather the information needed to install the profiling tables and start
1090 extern void _dl_start_profile (void) attribute_hidden
;
1092 /* The actual functions used to keep book on the calls. */
1093 extern void _dl_mcount (ElfW(Addr
) frompc
, ElfW(Addr
) selfpc
);
1094 rtld_hidden_proto (_dl_mcount
)
1096 /* This function is simply a wrapper around the _dl_mcount function
1097 which does not require a FROMPC parameter since this is the
1098 calling function. */
1099 extern void _dl_mcount_wrapper (void *selfpc
);
1101 /* Show the members of the auxiliary array passed up from the kernel. */
1102 extern void _dl_show_auxv (void) attribute_hidden
;
1104 /* Return all environment variables starting with `LD_', one after the
1106 extern char *_dl_next_ld_env_entry (char ***position
) attribute_hidden
;
1108 /* Return an array with the names of the important hardware
1109 capabilities. PREPEND is a colon-separated list of glibc-hwcaps
1110 directories to search first. MASK is a colon-separated list used
1111 to filter the built-in glibc-hwcaps subdirectories. The length of
1112 the array is written to *SZ, and the maximum of all strings length
1113 is written to *MAX_CAPSTRLEN. */
1114 const struct r_strlenpair
*_dl_important_hwcaps (const char *prepend
,
1117 size_t *max_capstrlen
)
1120 /* Look up NAME in ld.so.cache and return the file name stored there,
1121 or null if none is found. Caller must free returned string. */
1122 extern char *_dl_load_cache_lookup (const char *name
) attribute_hidden
;
1124 /* If the system does not support MAP_COPY we cannot leave the file open
1125 all the time since this would create problems when the file is replaced.
1126 Therefore we provide this function to close the file and open it again
1128 extern void _dl_unload_cache (void) attribute_hidden
;
1130 /* System-dependent function to read a file's whole contents in the
1131 most convenient manner available. *SIZEP gets the size of the
1132 file. On error MAP_FAILED is returned. */
1133 extern void *_dl_sysdep_read_whole_file (const char *file
, size_t *sizep
,
1134 int prot
) attribute_hidden
;
1136 /* System-specific function to do initial startup for the dynamic linker.
1137 After this, file access calls and getenv must work. This is responsible
1138 for setting __libc_enable_secure if we need to be secure (e.g. setuid),
1139 and for setting _dl_argc and _dl_argv, and then calling _dl_main. */
1140 extern ElfW(Addr
) _dl_sysdep_start (void **start_argptr
,
1141 void (*dl_main
) (const ElfW(Phdr
) *phdr
,
1143 ElfW(Addr
) *user_entry
,
1144 ElfW(auxv_t
) *auxv
))
1147 extern void _dl_sysdep_start_cleanup (void) attribute_hidden
;
1150 /* Determine next available module ID and set the L l_tls_modid. */
1151 extern void _dl_assign_tls_modid (struct link_map
*l
) attribute_hidden
;
1153 /* Count the modules with TLS segments. */
1154 extern size_t _dl_count_modids (void) attribute_hidden
;
1156 /* Calculate offset of the TLS blocks in the static TLS block. */
1157 extern void _dl_determine_tlsoffset (void) attribute_hidden
;
1159 /* Calculate the size of the static TLS surplus, when the given
1160 number of audit modules are loaded. */
1161 void _dl_tls_static_surplus_init (size_t naudit
) attribute_hidden
;
1163 /* This function is called very early from dl_main to set up TLS and
1164 other thread-related data structures. */
1165 void __tls_pre_init_tp (void) attribute_hidden
;
1167 /* This function is called after processor-specific initialization of
1168 the TCB and thread pointer via TLS_INIT_TP, to complete very early
1169 initialization of the thread library. */
1170 void __tls_init_tp (void) attribute_hidden
;
1173 /* Set up the TCB for statically linked applications. This is called
1174 early during startup because we always use TLS (for errno and the
1175 stack protector, among other things). */
1176 void __libc_setup_tls (void);
1178 # if ENABLE_STATIC_PIE
1179 /* Relocate static executable with PIE. */
1180 extern void _dl_relocate_static_pie (void) attribute_hidden
;
1182 /* Get a pointer to _dl_main_map. */
1183 extern struct link_map
* _dl_get_dl_main_map (void)
1184 __attribute__ ((visibility ("hidden")));
1186 # define _dl_relocate_static_pie()
1190 /* Perform early memory allocation, avoding a TCB dependency.
1191 Terminate the process if allocation fails. May attempt to use
1193 void *_dl_early_allocate (size_t size
) attribute_hidden
;
1195 /* Initialize the DSO sort algorithm to use. */
1199 _dl_sort_maps_init (void)
1201 /* This is optimized out if tunables are not enabled. */
1204 extern void _dl_sort_maps_init (void) attribute_hidden
;
1207 /* Initialization of libpthread for statically linked applications.
1208 If libpthread is not linked in, this is an empty function. */
1209 void __pthread_initialize_minimal (void) weak_function
;
1211 /* Allocate memory for static TLS block (unless MEM is nonzero) and dtv. */
1212 extern void *_dl_allocate_tls (void *mem
);
1213 rtld_hidden_proto (_dl_allocate_tls
)
1215 /* Get size and alignment requirements of the static TLS block. */
1216 extern void _dl_get_tls_static_info (size_t *sizep
, size_t *alignp
);
1218 extern void _dl_allocate_static_tls (struct link_map
*map
) attribute_hidden
;
1220 /* These are internal entry points to the two halves of _dl_allocate_tls,
1221 only used within rtld.c itself at startup time. */
1222 extern void *_dl_allocate_tls_storage (void) attribute_hidden
;
1223 extern void *_dl_allocate_tls_init (void *, bool);
1224 rtld_hidden_proto (_dl_allocate_tls_init
)
1226 /* True if the TCB has been set up. */
1227 extern bool __rtld_tls_init_tp_called attribute_hidden
;
1229 /* Deallocate memory allocated with _dl_allocate_tls. */
1230 extern void _dl_deallocate_tls (void *tcb
, bool dealloc_tcb
);
1231 rtld_hidden_proto (_dl_deallocate_tls
)
1233 extern void _dl_nothread_init_static_tls (struct link_map
*) attribute_hidden
;
1235 /* Find origin of the executable. */
1236 extern const char *_dl_get_origin (void) attribute_hidden
;
1239 extern size_t _dl_dst_count (const char *name
) attribute_hidden
;
1241 /* Substitute DST values. */
1242 extern char *_dl_dst_substitute (struct link_map
*l
, const char *name
,
1243 char *result
) attribute_hidden
;
1245 /* Open the shared object NAME, relocate it, and run its initializer if it
1246 hasn't already been run. MODE is as for `dlopen' (see <dlfcn.h>). If
1247 the object is already opened, returns its existing map. */
1248 extern void *_dl_open (const char *name
, int mode
, const void *caller
,
1249 Lmid_t nsid
, int argc
, char *argv
[], char *env
[])
1252 /* Free or queue for freeing scope OLD. If other threads might be
1253 in the middle of _dl_fixup, _dl_profile_fixup or dl*sym using the
1254 old scope, OLD can't be freed until no thread is using it. */
1255 extern int _dl_scope_free (void *) attribute_hidden
;
1258 /* Add module to slot information data. If DO_ADD is false, only the
1259 required memory is allocated. Must be called with GL
1260 (dl_load_tls_lock) acquired. If the function has already been called
1261 for the link map L with !do_add, then this function will not raise
1262 an exception, otherwise it is possible that it encounters a memory
1263 allocation failure. */
1264 extern void _dl_add_to_slotinfo (struct link_map
*l
, bool do_add
)
1267 /* Update slot information data for at least the generation of the
1268 module with the given index. */
1269 extern struct link_map
*_dl_update_slotinfo (unsigned long int req_modid
)
1272 /* Look up the module's TLS block as for __tls_get_addr,
1273 but never touch anything. Return null if it's not allocated yet. */
1274 extern void *_dl_tls_get_addr_soft (struct link_map
*l
) attribute_hidden
;
1276 extern int _dl_addr_inside_object (struct link_map
*l
, const ElfW(Addr
) addr
)
1279 /* Show show of an object. */
1280 extern void _dl_show_scope (struct link_map
*new, int from
)
1283 extern struct link_map
*_dl_find_dso_for_object (const ElfW(Addr
) addr
);
1284 rtld_hidden_proto (_dl_find_dso_for_object
)
1286 /* Initialization which is normally done by the dynamic linker. */
1287 extern void _dl_non_dynamic_init (void)
1290 /* Used by static binaries to check the auxiliary vector. */
1291 extern void _dl_aux_init (ElfW(auxv_t
) *av
)
1294 /* Initialize the static TLS space for the link map in all existing
1297 void _dl_init_static_tls (struct link_map
*map
) attribute_hidden
;
1300 dl_init_static_tls (struct link_map
*map
)
1303 /* The stack list is available to ld.so, so the initialization can
1304 be handled within ld.so directly. */
1305 _dl_init_static_tls (map
);
1307 GL (dl_init_static_tls
) (map
);
1312 /* Called before relocating ld.so during static dlopen. This can be
1313 used to partly initialize the dormant ld.so copy in the static
1314 dlopen namespace. */
1315 void __rtld_static_init (struct link_map
*map
) attribute_hidden
;
1318 /* Return true if the ld.so copy in this namespace is actually active
1319 and working. If false, the dl_open/dlfcn hooks have to be used to
1320 call into the outer dynamic linker (which happens after static
1326 /* The default-initialized variable does not have a non-zero
1327 dl_init_all_dirs member, so this allows us to recognize an
1328 initialized and active ld.so copy. */
1329 return GLRO(dl_init_all_dirs
) != NULL
;
1332 static inline struct auditstate
*
1333 link_map_audit_state (struct link_map
*l
, size_t index
)
1335 if (l
== &GL (dl_rtld_map
))
1336 /* The auditstate array is stored separately. */
1337 return &GL (dl_rtld_auditstate
) [index
];
1340 /* The auditstate array follows the link map in memory. */
1341 struct auditstate
*base
= (struct auditstate
*) (l
+ 1);
1342 return &base
[index
];
1346 /* Call the la_objsearch from the audit modules from the link map L. If
1347 ORIGNAME is non NULL, it is updated with the revious name prior calling
1349 const char *_dl_audit_objsearch (const char *name
, struct link_map
*l
,
1353 /* Call the la_activity from the audit modules from the link map L and issues
1354 the ACTION argument. */
1355 void _dl_audit_activity_map (struct link_map
*l
, int action
)
1358 /* Call the la_activity from the audit modules from the link map from the
1359 namespace NSID and issues the ACTION argument. */
1360 void _dl_audit_activity_nsid (Lmid_t nsid
, int action
)
1363 /* Call the la_objopen from the audit modules for the link_map L on the
1364 namespace identification NSID. */
1365 void _dl_audit_objopen (struct link_map
*l
, Lmid_t nsid
)
1368 /* Call the la_objclose from the audit modules for the link_map L. */
1369 void _dl_audit_objclose (struct link_map
*l
)
1372 /* Call the la_preinit from the audit modules for the link_map L. */
1373 void _dl_audit_preinit (struct link_map
*l
);
1375 /* Call the la_symbind{32,64} from the audit modules for the link_map L. If
1376 RELOC_RESULT is NULL it assumes the symbol to be bind-now and will set
1377 the flags with LA_SYMB_NOPLTENTER | LA_SYMB_NOPLTEXIT prior calling
1378 la_symbind{32,64}. */
1379 void _dl_audit_symbind (struct link_map
*l
, struct reloc_result
*reloc_result
,
1380 const ElfW(Sym
) *defsym
, DL_FIXUP_VALUE_TYPE
*value
,
1383 /* Same as _dl_audit_symbind, but also sets LA_SYMB_DLSYM flag. */
1384 void _dl_audit_symbind_alt (struct link_map
*l
, const ElfW(Sym
) *ref
,
1385 void **value
, lookup_t result
);
1386 rtld_hidden_proto (_dl_audit_symbind_alt
)
1387 void _dl_audit_pltenter (struct link_map
*l
, struct reloc_result
*reloc_result
,
1388 DL_FIXUP_VALUE_TYPE
*value
, void *regs
,
1389 long int *framesize
)
1391 void DL_ARCH_FIXUP_ATTRIBUTE
_dl_audit_pltexit (struct link_map
*l
,
1392 ElfW(Word
) reloc_arg
,
1398 #if PTHREAD_IN_LIBC && defined SHARED
1399 /* Recursive locking implementation for use within the dynamic loader.
1400 Used to define the __rtld_lock_lock_recursive and
1401 __rtld_lock_unlock_recursive via <libc-lock.h>. Initialized to a
1402 no-op dummy implementation early. Similar
1403 to GL (dl_rtld_lock_recursive) and GL (dl_rtld_unlock_recursive)
1404 in !PTHREAD_IN_LIBC builds. */
1405 extern int (*___rtld_mutex_lock
) (pthread_mutex_t
*) attribute_hidden
;
1406 extern int (*___rtld_mutex_unlock
) (pthread_mutex_t
*lock
) attribute_hidden
;
1408 /* Called after libc has been loaded, but before RELRO is activated.
1409 Used to initialize the function pointers to the actual
1411 void __rtld_mutex_init (void) attribute_hidden
;
1412 #else /* !PTHREAD_IN_LIBC */
1414 __rtld_mutex_init (void)
1416 /* The initialization happens later (!PTHREAD_IN_LIBC) or is not
1417 needed at all (!SHARED). */
1419 #endif /* !PTHREAD_IN_LIBC */
1421 /* Implementation of GL (dl_libc_freeres). */
1422 void __rtld_libc_freeres (void) attribute_hidden
;
1424 void __thread_gscope_wait (void) attribute_hidden
;
1425 # define THREAD_GSCOPE_WAIT() __thread_gscope_wait ()
1429 #endif /* ldsodefs.h */