1 /* Run-time dynamic linker data structures for loaded ELF shared objects.
2 Copyright (C) 1995-1999, 2000, 2001, 2002 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, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
33 #include <fpu_control.h>
36 #include <dl-lookupcfg.h>
37 #include <bits/libc-lock.h>
38 #include <hp-timing.h>
43 /* We use this macro to refer to ELF types independent of the native wordsize.
44 `ElfW(TYPE)' is used in place of `Elf32_TYPE' or `Elf64_TYPE'. */
45 #define ELFW(type) _ElfW (ELF, __ELF_NATIVE_CLASS, type)
47 /* All references to the value of l_info[DT_PLTGOT],
48 l_info[DT_STRTAB], l_info[DT_SYMTAB], l_info[DT_RELA],
49 l_info[DT_REL], l_info[DT_JMPREL], and l_info[VERSYMIDX (DT_VERSYM)]
50 have to be accessed via the D_PTR macro. The macro is needed since for
51 most architectures the entry is already relocated - but for some not
52 and we need to relocate at access time. */
53 #ifdef DL_RO_DYN_SECTION
54 # define D_PTR(map,i) (map->i->d_un.d_ptr + map->l_addr)
56 # define D_PTR(map,i) map->i->d_un.d_ptr
59 /* On some platforms more information than just the address of the symbol
60 is needed from the lookup functions. In this case we return the whole
62 #ifdef DL_LOOKUP_RETURNS_MAP
63 typedef struct link_map *lookup_t;
64 # define LOOKUP_VALUE(map) map
65 # define LOOKUP_VALUE_ADDRESS(map) (map ? map->l_addr : 0)
67 typedef ElfW(Addr) lookup_t;
68 # define LOOKUP_VALUE(map) map->l_addr
69 # define LOOKUP_VALUE_ADDRESS(address) address
72 /* on some architectures a pointer to a function is not just a pointer
73 to the actual code of the function but rather an architecture
74 specific descriptor. */
75 #ifndef ELF_FUNCTION_PTR_IS_SPECIAL
76 # define DL_SYMBOL_ADDRESS(map, ref) \
77 (void *) (LOOKUP_VALUE_ADDRESS (map) + ref->st_value)
78 # define DL_LOOKUP_ADDRESS(addr) ((ElfW(Addr)) (addr))
79 # define DL_DT_INIT_ADDRESS(map, start) (start)
80 # define DL_DT_FINI_ADDRESS(map, start) (start)
83 /* Unmap a loaded object, called by _dl_close (). */
84 #ifndef DL_UNMAP_IS_SPECIAL
85 # define DL_UNMAP(map) \
86 __munmap ((void *) (map)->l_map_start, \
87 (map)->l_map_end - (map)->l_map_start)
90 /* By default we do not need special support to initialize DSOs loaded
91 by statically linked binaries. */
92 #ifndef DL_STATIC_INIT
93 # define DL_STATIC_INIT(map)
96 /* Reloc type classes as returned by elf_machine_type_class().
97 ELF_RTYPE_CLASS_PLT means this reloc should not be satisfied by
98 some PLT symbol, ELF_RTYPE_CLASS_COPY means this reloc should not be
99 satisfied by any symbol in the executable. */
100 #define ELF_RTYPE_CLASS_PLT 1
101 #define ELF_RTYPE_CLASS_COPY 2
103 /* ELF uses the PF_x macros to specify the segment permissions, mmap
104 uses PROT_xxx. In most cases the three macros have the values 1, 2,
105 and 3 but not in a matching order. The following macros allows
106 converting from the PF_x values to PROT_xxx values. */
108 ((PROT_READ << (PF_R * 4)) \
109 | (PROT_WRITE << (PF_W * 4)) \
110 | (PROT_EXEC << (PF_X * 4)) \
111 | ((PROT_READ | PROT_WRITE) << ((PF_R | PF_W) * 4)) \
112 | ((PROT_READ | PROT_EXEC) << ((PF_R | PF_X) * 4)) \
113 | ((PROT_WRITE | PROT_EXEC) << (PF_W | PF_X) * 4) \
114 | ((PROT_READ | PROT_WRITE | PROT_EXEC) << ((PF_R | PF_W | PF_X) * 4)))
117 /* For the version handling we need an array with only names and their
119 struct r_found_version
125 const char *filename;
128 /* We want to cache information about the searches for shared objects. */
130 enum r_dir_status { unknown, nonexisting, existing };
132 struct r_search_path_elem
134 /* This link is only used in the `all_dirs' member of `r_search_path'. */
135 struct r_search_path_elem *next;
137 /* Strings saying where the definition came from. */
141 /* Basename for this search path element. The string must end with
142 a slash character. */
146 enum r_dir_status status[0];
156 /* A data structure for a simple single linked list of strings. */
159 const char *name; /* Name requested (before search). */
160 struct libname_list *next; /* Link to next name for this object. */
161 int dont_free; /* Flag whether this element should be freed
162 if the object is not entirely unloaded. */
166 /* Test whether given NAME matches any of the names of the given object. */
168 __attribute__ ((unused))
169 _dl_name_match_p (const char *__name, struct link_map *__map)
171 int __found = strcmp (__name, __map->l_name) == 0;
172 struct libname_list *__runp = __map->l_libname;
174 while (! __found && __runp != NULL)
175 if (strcmp (__name, __runp->name) == 0)
178 __runp = __runp->next;
183 /* Function used as argument for `_dl_receive_error' function. The
184 arguments are the error code, error string, and the objname the
185 error occurred in. */
186 typedef void (*receiver_fct) (int, const char *, const char *);
188 /* Internal functions of the run-time dynamic linker.
189 These can be accessed if you link again the dynamic linker
190 as a shared library, as in `-lld' or `/lib/ld.so' explicitly;
191 but are not normally of interest to user programs.
193 The `-ldl' library functions in <dlfcn.h> provide a simple
194 user interface to run-time dynamic linking. */
198 # define EXTERN extern
199 # define GL(name) _##name
203 # define GL(name) _rtld_local._##name
205 # define GL(name) _rtld_global._##name
210 /* Don't change the order of the following elements. 'dl_loaded'
211 must remain the first element. Forever. */
213 /* And a pointer to the map for the main map. */
214 EXTERN struct link_map *_dl_loaded;
215 /* Number of object in the _dl_loaded list. */
216 EXTERN unsigned int _dl_nloaded;
217 /* Array representing global scope. */
218 EXTERN struct r_scope_elem *_dl_global_scope[2];
219 /* Direct pointer to the searchlist of the main object. */
220 EXTERN struct r_scope_elem *_dl_main_searchlist;
221 /* Copy of the content of `_dl_main_searchlist'. */
222 EXTERN struct r_scope_elem _dl_initial_searchlist;
223 /* This is zero at program start to signal that the global scope map is
224 allocated by rtld. Later it keeps the size of the map. It might be
225 reset if in _dl_close if the last global object is removed. */
226 EXTERN size_t _dl_global_scope_alloc;
228 /* If nonzero the appropriate debug information is printed. */
229 EXTERN int _dl_debug_mask;
230 #define DL_DEBUG_LIBS (1 << 0)
231 #define DL_DEBUG_IMPCALLS (1 << 1)
232 #define DL_DEBUG_BINDINGS (1 << 2)
233 #define DL_DEBUG_SYMBOLS (1 << 3)
234 #define DL_DEBUG_VERSIONS (1 << 4)
235 #define DL_DEBUG_RELOC (1 << 5)
236 #define DL_DEBUG_FILES (1 << 6)
237 #define DL_DEBUG_STATISTICS (1 << 7)
238 /* These two are used only internally. */
239 #define DL_DEBUG_HELP (1 << 8)
240 #define DL_DEBUG_PRELINK (1 << 9)
242 /* Cached value of `getpagesize ()'. */
243 EXTERN size_t _dl_pagesize;
245 /* During the program run we must not modify the global data of
246 loaded shared object simultanously in two threads. Therefore we
247 protect `_dl_open' and `_dl_close' in dl-close.c.
249 This must be a recursive lock since the initializer function of
250 the loaded object might as well require a call to this function.
251 At this time it is not anymore a problem to modify the tables. */
252 __libc_lock_define_recursive (EXTERN, _dl_load_lock)
255 EXTERN unsigned int _dl_osversion;
257 EXTERN const char *_dl_platform;
258 EXTERN size_t _dl_platformlen;
261 /* File descriptor referring to the zero-fill device. */
262 EXTERN int _dl_zerofd;
265 /* CLK_TCK as reported by the kernel. */
266 EXTERN int _dl_clktck;
268 /* If nonzero print warnings messages. */
269 EXTERN int _dl_verbose;
271 /* Do we do lazy relocations? */
274 /* Nonzero if runtime lookups should not update the .got/.plt. */
275 EXTERN int _dl_bind_not;
277 /* Nonzero if references should be treated as weak during runtime
279 EXTERN int _dl_dynamic_weak;
281 /* Default floating-point control word. */
282 EXTERN fpu_control_t _dl_fpu_control;
284 /* The object to be initialized first. */
285 EXTERN struct link_map *_dl_initfirst;
287 #if HP_TIMING_AVAIL || HP_SMALL_TIMING_AVAIL
288 /* Start time on CPU clock. */
289 EXTERN hp_timing_t _dl_cpuclock_offset;
291 /* Overhead of a high-precision timing measurement. */
292 EXTERN hp_timing_t _dl_hp_timing_overhead;
296 /* Highest dtv index currently needed. */
297 EXTERN size_t _dl_tls_max_dtv_idx;
298 /* Flag signalling whether there are gaps in the module ID allocation. */
299 EXTERN bool _dl_tls_dtv_gaps;
300 /* Information about the dtv slots. */
301 EXTERN struct dtv_slotinfo_list
304 struct dtv_slotinfo_list *next;
308 struct link_map *map;
310 } *_dl_tls_dtv_slotinfo_list;
311 /* Number of modules in the static TLS block. */
312 EXTERN size_t _dl_tls_static_nelem;
313 /* Size of the static TLS block. */
314 EXTERN size_t _dl_tls_static_size;
315 /* Alignment requirement of the static TLS block. */
316 EXTERN size_t _dl_tls_static_align;
318 /* Number of additional entries in the slotinfo array of each slotinfo
319 list element. A large number makes it almost certain take we never
320 have to iterate beyond the first element in the slotinfo list. */
321 # define TLS_SLOTINFO_SURPLUS (62)
323 /* Number of additional slots in the dtv allocated. */
324 # define DTV_SURPLUS (14)
326 /* True if the dtv for the initial thread was malloc()ed. */
327 EXTERN bool _dl_initial_dtv_malloced;
328 /* Generation counter for the dtv. */
329 EXTERN size_t _dl_tls_generation;
332 /* Name of the shared object to be profiled (if any). */
333 EXTERN const char *_dl_profile;
334 /* Map of shared object to be profiled. */
335 EXTERN struct link_map *_dl_profile_map;
336 /* Filename of the output file. */
337 EXTERN const char *_dl_profile_output;
338 /* Map of shared object to be prelink traced. */
339 EXTERN struct link_map *_dl_trace_prelink_map;
340 /* Name of the object we want to trace the prelinking. */
341 EXTERN const char *_dl_trace_prelink;
343 /* Expected cache ID. */
344 EXTERN int _dl_correct_cache_id;
346 /* Counters for the number of relocations performed. */
347 EXTERN unsigned long int _dl_num_relocations;
348 EXTERN unsigned long int _dl_num_cache_relocations;
350 /* Mask for hardware capabilities that are available. */
351 EXTERN unsigned long int _dl_hwcap;
353 /* Mask for important hardware capabilities we honour. */
354 EXTERN unsigned long int _dl_hwcap_mask;
356 /* Names of shared object for which the RPATH should be ignored. */
357 EXTERN const char *_dl_inhibit_rpath;
359 /* Location of the binary. */
360 EXTERN const char *_dl_origin_path;
362 /* List of search directories. */
363 EXTERN struct r_search_path_elem *_dl_all_dirs;
364 EXTERN struct r_search_path_elem *_dl_init_all_dirs;
366 /* File descriptor to write debug messages to. */
367 EXTERN int _dl_debug_fd;
369 /* Get architecture specific definitions. */
370 #define PROCINFO_DECL
371 #include <dl-procinfo.c>
373 /* Structure describing the dynamic linker itself. */
374 EXTERN struct link_map _dl_rtld_map;
377 extern struct rtld_global _rtld_global;
379 # ifdef HAVE_VISIBILITY_ATTRIBUTE
380 # ifdef HAVE_SDATA_SECTION
381 # define __rtld_local_attribute__ \
382 __attribute__ ((visibility ("hidden"), section (".sdata")))
384 # define __rtld_local_attribute__ __attribute__ ((visibility ("hidden")))
387 # define __rtld_local_attribute__
389 extern struct rtld_global _rtld_local __rtld_local_attribute__;
394 /* Parameters passed to the dynamic linker. */
395 extern int _dl_argc attribute_hidden;
396 extern char **_dl_argv;
398 extern char **_dl_argv_internal attribute_hidden;
399 # define rtld_progname (INTUSE(_dl_argv)[0])
401 # define rtld_progname _dl_argv[0]
404 /* The array with message we print as a last resort. */
405 extern const char _dl_out_of_memory[];
407 /* XXX #ifdef should go away. */
408 extern const char _dl_out_of_memory_internal[] attribute_hidden;
412 /* OS-dependent function to open the zero-fill device. */
413 extern int _dl_sysdep_open_zero_fill (void); /* dl-sysdep.c */
416 /* Write message on the debug file descriptor. The parameters are
417 interpreted as for a `printf' call. All the lines start with a
418 tag showing the PID. */
419 extern void _dl_debug_printf (const char *fmt, ...)
420 __attribute__ ((__format__ (__printf__, 1, 2)));
421 extern void _dl_debug_printf_internal (const char *fmt, ...)
422 __attribute__ ((__format__ (__printf__, 1, 2)));
424 /* Write message on the debug file descriptor. The parameters are
425 interpreted as for a `printf' call. All the lines buf the first
426 start with a tag showing the PID. */
427 extern void _dl_debug_printf_c (const char *fmt, ...)
428 __attribute__ ((__format__ (__printf__, 1, 2)));
431 /* Write a message on the specified descriptor FD. The parameters are
432 interpreted as for a `printf' call. */
433 extern void _dl_dprintf (int fd, const char *fmt, ...)
434 __attribute__ ((__format__ (__printf__, 2, 3)));
436 /* Write a message on the specified descriptor standard output. The
437 parameters are interpreted as for a `printf' call. */
438 #define _dl_printf(fmt, args...) \
439 _dl_dprintf (STDOUT_FILENO, fmt, ##args)
441 /* Write a message on the specified descriptor standard error. The
442 parameters are interpreted as for a `printf' call. */
443 #define _dl_error_printf(fmt, args...) \
444 _dl_dprintf (STDERR_FILENO, fmt, ##args)
446 /* Write a message on the specified descriptor standard error and exit
447 the program. The parameters are interpreted as for a `printf' call. */
448 #define _dl_fatal_printf(fmt, args...) \
451 _dl_dprintf (STDERR_FILENO, fmt, ##args); \
457 /* This function is called by all the internal dynamic linker functions
458 when they encounter an error. ERRCODE is either an `errno' code or
459 zero; OBJECT is the name of the problematical shared object, or null if
460 it is a general problem; ERRSTRING is a string describing the specific
462 extern void _dl_signal_error (int errcode, const char *object,
463 const char *occurred, const char *errstring)
465 __attribute__ ((__noreturn__));
466 extern void _dl_signal_error_internal (int errcode, const char *object,
467 const char *occurred,
468 const char *errstring)
470 __attribute__ ((__noreturn__));
472 /* Like _dl_signal_error, but may return when called in the context of
473 _dl_receive_error. */
474 extern void _dl_signal_cerror (int errcode, const char *object,
475 const char *occation, const char *errstring)
478 /* Call OPERATE, receiving errors from `dl_signal_cerror'. Unlike
479 `_dl_catch_error' the operation is resumed after the OPERATE
481 ARGS is passed as argument to OPERATE. */
482 extern void _dl_receive_error (receiver_fct fct, void (*operate) (void *),
487 /* Open the shared object NAME and map in its segments.
488 LOADER's DT_RPATH is used in searching for NAME.
489 If the object is already opened, returns its existing map.
490 For preloaded shared objects PRELOADED is set to a non-zero
491 value to allow additional security checks. */
492 extern struct link_map *_dl_map_object (struct link_map *loader,
493 const char *name, int preloaded,
494 int type, int trace_mode, int mode)
496 extern struct link_map *_dl_map_object_internal (struct link_map *loader,
499 int type, int trace_mode,
503 /* Call _dl_map_object on the dependencies of MAP, and set up
504 MAP->l_searchlist. PRELOADS points to a vector of NPRELOADS previously
505 loaded objects that will be inserted into MAP->l_searchlist after MAP
506 but before its dependencies. */
507 extern void _dl_map_object_deps (struct link_map *map,
508 struct link_map **preloads,
509 unsigned int npreloads, int trace_mode,
512 extern void _dl_map_object_deps_internal (struct link_map *map,
513 struct link_map **preloads,
514 unsigned int npreloads,
515 int trace_mode, int open_mode)
518 /* Cache the locations of MAP's hash table. */
519 extern void _dl_setup_hash (struct link_map *map) internal_function;
522 /* Search loaded objects' symbol tables for a definition of the symbol
523 referred to by UNDEF. *SYM is the symbol table entry containing the
524 reference; it is replaced with the defining symbol, and the base load
525 address of the defining object is returned. SYMBOL_SCOPE is a
526 null-terminated list of object scopes to search; each object's
527 l_searchlist (i.e. the segment of the dependency tree starting at that
528 object) is searched in turn. REFERENCE_NAME should name the object
529 containing the reference; it is used in error messages.
530 TYPE_CLASS describes the type of symbol we are looking for. */
531 extern lookup_t _dl_lookup_symbol (const char *undef,
532 struct link_map *undef_map,
533 const ElfW(Sym) **sym,
534 struct r_scope_elem *symbol_scope[],
535 int type_class, int explicit)
537 extern lookup_t _dl_lookup_symbol_internal (const char *undef,
538 struct link_map *undef_map,
539 const ElfW(Sym) **sym,
540 struct r_scope_elem *symbol_scope[],
541 int type_class, int explicit)
544 /* Lookup versioned symbol. */
545 extern lookup_t _dl_lookup_versioned_symbol (const char *undef,
546 struct link_map *undef_map,
547 const ElfW(Sym) **sym,
548 struct r_scope_elem *symbol_scope[],
549 const struct r_found_version *version,
550 int type_class, int explicit)
552 extern lookup_t _dl_lookup_versioned_symbol_internal (const char *undef,
553 struct link_map *undef_map,
554 const ElfW(Sym) **sym,
555 struct r_scope_elem *symbol_scope[],
556 const struct r_found_version *version,
561 /* For handling RTLD_NEXT we must be able to skip shared objects. */
562 extern lookup_t _dl_lookup_symbol_skip (const char *undef,
563 struct link_map *undef_map,
564 const ElfW(Sym) **sym,
565 struct r_scope_elem *symbol_scope[],
566 struct link_map *skip_this)
569 /* For handling RTLD_NEXT with versioned symbols we must be able to
570 skip shared objects. */
571 extern lookup_t _dl_lookup_versioned_symbol_skip (const char *undef,
572 struct link_map *undef_map,
573 const ElfW(Sym) **sym,
574 struct r_scope_elem *symbol_scope[],
575 const struct r_found_version *version,
576 struct link_map *skip_this)
579 /* Look up symbol NAME in MAP's scope and return its run-time address. */
580 extern ElfW(Addr) _dl_symbol_value (struct link_map *map, const char *name)
583 /* Allocate a `struct link_map' for a new object being loaded,
584 and enter it into the _dl_main_map list. */
585 extern struct link_map *_dl_new_object (char *realname, const char *libname,
586 int type, struct link_map *loader)
589 /* Relocate the given object (if it hasn't already been).
590 SCOPE is passed to _dl_lookup_symbol in symbol lookups.
591 If LAZY is nonzero, don't relocate its PLT. */
592 extern void _dl_relocate_object (struct link_map *map,
593 struct r_scope_elem *scope[],
594 int lazy, int consider_profiling);
595 extern void _dl_relocate_object_internal (struct link_map *map,
596 struct r_scope_elem *scope[],
597 int lazy, int consider_profiling);
599 /* Call _dl_signal_error with a message about an unhandled reloc type.
600 TYPE is the result of ELFW(R_TYPE) (r_info), i.e. an R_<CPU>_* value.
601 PLT is nonzero if this was a PLT reloc; it just affects the message. */
602 extern void _dl_reloc_bad_type (struct link_map *map,
603 unsigned int type, int plt)
604 internal_function __attribute__ ((__noreturn__));
606 /* Resolve conflicts if prelinking. */
607 extern void _dl_resolve_conflicts (struct link_map *l,
608 ElfW(Rela) *conflict,
609 ElfW(Rela) *conflictend);
611 /* Check the version dependencies of all objects available through
612 MAP. If VERBOSE print some more diagnostics. */
613 extern int _dl_check_all_versions (struct link_map *map, int verbose,
617 /* Check the version dependencies for MAP. If VERBOSE print some more
619 extern int _dl_check_map_versions (struct link_map *map, int verbose,
623 /* Initialize the object in SCOPE by calling the constructors with
624 ARGC, ARGV, and ENV as the parameters. */
625 extern void _dl_init (struct link_map *main_map, int argc, char **argv,
626 char **env) internal_function;
628 /* Call the finalizer functions of all shared objects whose
629 initializer functions have completed. */
630 extern void _dl_fini (void) internal_function;
632 /* The dynamic linker calls this function before and having changing
633 any shared object mappings. The `r_state' member of `struct r_debug'
634 says what change is taking place. This function's address is
635 the value of the `r_brk' member. */
636 extern void _dl_debug_state (void);
637 extern void _dl_debug_state_internal (void) attribute_hidden;
639 /* Initialize `struct r_debug' if it has not already been done. The
640 argument is the run-time load address of the dynamic linker, to be put
641 in the `r_ldbase' member. Returns the address of the structure. */
642 extern struct r_debug *_dl_debug_initialize (ElfW(Addr) ldbase)
645 /* Initialize the basic data structure for the search paths. */
646 extern void _dl_init_paths (const char *library_path) internal_function;
648 /* Gather the information needed to install the profiling tables and start
650 extern void _dl_start_profile (struct link_map *map, const char *output_dir)
652 extern void _dl_start_profile_internal (struct link_map *map,
653 const char *output_dir)
656 /* The actual functions used to keep book on the calls. */
657 extern void _dl_mcount (ElfW(Addr) frompc, ElfW(Addr) selfpc);
658 extern void _dl_mcount_internal (ElfW(Addr) frompc, ElfW(Addr) selfpc)
661 /* This function is simply a wrapper around the _dl_mcount function
662 which does not require a FROMPC parameter since this is the
664 extern void _dl_mcount_wrapper (void *selfpc);
666 /* Show the members of the auxiliary array passed up from the kernel. */
667 extern void _dl_show_auxv (void) internal_function;
669 /* Return all environment variables starting with `LD_', one after the
671 extern char *_dl_next_ld_env_entry (char ***position) internal_function;
673 /* Return an array with the names of the important hardware capabilities. */
674 extern const struct r_strlenpair *_dl_important_hwcaps (const char *platform,
677 size_t *max_capstrlen)
680 /* Look up NAME in ld.so.cache and return the file name stored there,
681 or null if none is found. */
682 extern const char *_dl_load_cache_lookup (const char *name)
685 /* If the system does not support MAP_COPY we cannot leave the file open
686 all the time since this would create problems when the file is replaced.
687 Therefore we provide this function to close the file and open it again
689 extern void _dl_unload_cache (void);
690 extern void _dl_unload_cache_internal (void);
692 /* System-dependent function to read a file's whole contents in the
693 most convenient manner available. *SIZEP gets the size of the
694 file. On error MAP_FAILED is returned. */
695 extern void *_dl_sysdep_read_whole_file (const char *file, size_t *sizep,
699 /* System-specific function to do initial startup for the dynamic linker.
700 After this, file access calls and getenv must work. This is responsible
701 for setting __libc_enable_secure if we need to be secure (e.g. setuid),
702 and for setting _dl_argc and _dl_argv, and then calling _dl_main. */
703 extern ElfW(Addr) _dl_sysdep_start (void **start_argptr,
704 void (*dl_main) (const ElfW(Phdr) *phdr,
706 ElfW(Addr) *user_entry));
708 extern void _dl_sysdep_start_cleanup (void)
712 /* Determine next available module ID. */
713 extern size_t _dl_next_tls_modid (void) internal_function;
715 /* Calculate offset of the TLS blocks in the static TLS block. */
716 extern void _dl_determine_tlsoffset (void) internal_function;
718 /* Allocate memory for static TLS block and dtv. */
719 extern void *_dl_allocate_tls (void) internal_function;
720 extern void *_dl_allocate_tls_internal (void) internal_function;
722 /* Deallocate memory allocated with _dl_allocate_tls. */
723 extern void _dl_deallocate_tls (void *tcb) internal_function;
725 /* Return the symbol address given the map of the module it is in and
726 the symbol record. */
727 extern void *_dl_tls_symaddr (struct link_map *map, const ElfW(Sym) *ref)
732 #endif /* ldsodefs.h */