mirror of
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d3c9f89525
2002-12-06 Ulrich Drepper <drepper@redhat.com> * misc/syslog.c (log_cleanup): New function. (openlog): Use log_cleanup instead of __libc_mutex_unlock. (closelog): Likewise. * elf/dl-close.c: Use __rtld_lock_* macros instead of __libc_lock_*. * elf/dl-iteratephdr.c: Likewise. * elf/dl-lookup.c: Likewise. * elf/dl-misc.c: Likewise. * elf/dl-open.c: Likewise. * elf/dl-support.c: Likewise. * elf/rtld.c: Likewise. * sysdeps/generic/ldsodefs.h: Likewise. * sysdeps/generic/bits/libc-lock.h: Define __rtld_lock_* macros. * sysdeps/mach/bits/libc-lock.h: Likewise. * sysdeps/mach/hurd/bits/libc-lock.h: Likewise. * dirent/bug-readdir1.c (main): Don't call closedir, just close
790 lines
28 KiB
C
790 lines
28 KiB
C
/* Run-time dynamic linker data structures for loaded ELF shared objects.
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Copyright (C) 1995-1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _LDSODEFS_H
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#define _LDSODEFS_H 1
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#include <features.h>
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#include <stdbool.h>
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#define __need_size_t
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#define __need_NULL
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#include <stddef.h>
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#include <string.h>
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#include <elf.h>
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#include <dlfcn.h>
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#include <fpu_control.h>
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#include <sys/mman.h>
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#include <link.h>
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#include <dl-lookupcfg.h>
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#include <dl-sysdep.h>
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#include <bits/libc-lock.h>
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#include <hp-timing.h>
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#include <tls.h>
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__BEGIN_DECLS
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/* We use this macro to refer to ELF types independent of the native wordsize.
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`ElfW(TYPE)' is used in place of `Elf32_TYPE' or `Elf64_TYPE'. */
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#define ELFW(type) _ElfW (ELF, __ELF_NATIVE_CLASS, type)
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/* All references to the value of l_info[DT_PLTGOT],
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l_info[DT_STRTAB], l_info[DT_SYMTAB], l_info[DT_RELA],
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l_info[DT_REL], l_info[DT_JMPREL], and l_info[VERSYMIDX (DT_VERSYM)]
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have to be accessed via the D_PTR macro. The macro is needed since for
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most architectures the entry is already relocated - but for some not
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and we need to relocate at access time. */
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#ifdef DL_RO_DYN_SECTION
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# define D_PTR(map,i) (map->i->d_un.d_ptr + map->l_addr)
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#else
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# define D_PTR(map,i) map->i->d_un.d_ptr
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#endif
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/* On some platforms more information than just the address of the symbol
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is needed from the lookup functions. In this case we return the whole
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link map. */
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#ifdef DL_LOOKUP_RETURNS_MAP
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typedef struct link_map *lookup_t;
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# define LOOKUP_VALUE(map) map
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# define LOOKUP_VALUE_ADDRESS(map) (map ? map->l_addr : 0)
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#else
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typedef ElfW(Addr) lookup_t;
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# define LOOKUP_VALUE(map) map->l_addr
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# define LOOKUP_VALUE_ADDRESS(address) address
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#endif
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/* on some architectures a pointer to a function is not just a pointer
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to the actual code of the function but rather an architecture
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specific descriptor. */
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#ifndef ELF_FUNCTION_PTR_IS_SPECIAL
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# define DL_SYMBOL_ADDRESS(map, ref) \
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(void *) (LOOKUP_VALUE_ADDRESS (map) + ref->st_value)
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# define DL_LOOKUP_ADDRESS(addr) ((ElfW(Addr)) (addr))
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# define DL_DT_INIT_ADDRESS(map, start) (start)
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# define DL_DT_FINI_ADDRESS(map, start) (start)
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#endif
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/* Unmap a loaded object, called by _dl_close (). */
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#ifndef DL_UNMAP_IS_SPECIAL
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# define DL_UNMAP(map) \
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__munmap ((void *) (map)->l_map_start, \
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(map)->l_map_end - (map)->l_map_start)
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#endif
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/* By default we do not need special support to initialize DSOs loaded
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by statically linked binaries. */
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#ifndef DL_STATIC_INIT
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# define DL_STATIC_INIT(map)
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#endif
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/* Reloc type classes as returned by elf_machine_type_class().
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ELF_RTYPE_CLASS_PLT means this reloc should not be satisfied by
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some PLT symbol, ELF_RTYPE_CLASS_COPY means this reloc should not be
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satisfied by any symbol in the executable. */
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#define ELF_RTYPE_CLASS_PLT 1
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#define ELF_RTYPE_CLASS_COPY 2
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/* ELF uses the PF_x macros to specify the segment permissions, mmap
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uses PROT_xxx. In most cases the three macros have the values 1, 2,
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and 3 but not in a matching order. The following macros allows
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converting from the PF_x values to PROT_xxx values. */
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#define PF_TO_PROT \
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((PROT_READ << (PF_R * 4)) \
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| (PROT_WRITE << (PF_W * 4)) \
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| (PROT_EXEC << (PF_X * 4)) \
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| ((PROT_READ | PROT_WRITE) << ((PF_R | PF_W) * 4)) \
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| ((PROT_READ | PROT_EXEC) << ((PF_R | PF_X) * 4)) \
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| ((PROT_WRITE | PROT_EXEC) << (PF_W | PF_X) * 4) \
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| ((PROT_READ | PROT_WRITE | PROT_EXEC) << ((PF_R | PF_W | PF_X) * 4)))
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/* For the version handling we need an array with only names and their
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hash values. */
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struct r_found_version
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{
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const char *name;
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ElfW(Word) hash;
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int hidden;
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const char *filename;
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};
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/* We want to cache information about the searches for shared objects. */
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enum r_dir_status { unknown, nonexisting, existing };
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struct r_search_path_elem
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{
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/* This link is only used in the `all_dirs' member of `r_search_path'. */
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struct r_search_path_elem *next;
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/* Strings saying where the definition came from. */
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const char *what;
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const char *where;
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/* Basename for this search path element. The string must end with
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a slash character. */
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const char *dirname;
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size_t dirnamelen;
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enum r_dir_status status[0];
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};
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struct r_strlenpair
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{
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const char *str;
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size_t len;
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};
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/* A data structure for a simple single linked list of strings. */
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struct libname_list
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{
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const char *name; /* Name requested (before search). */
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struct libname_list *next; /* Link to next name for this object. */
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int dont_free; /* Flag whether this element should be freed
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if the object is not entirely unloaded. */
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};
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/* Test whether given NAME matches any of the names of the given object. */
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static __inline int
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__attribute__ ((unused))
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_dl_name_match_p (const char *__name, struct link_map *__map)
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{
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int __found = strcmp (__name, __map->l_name) == 0;
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struct libname_list *__runp = __map->l_libname;
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while (! __found && __runp != NULL)
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if (strcmp (__name, __runp->name) == 0)
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__found = 1;
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else
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__runp = __runp->next;
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return __found;
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}
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/* Function used as argument for `_dl_receive_error' function. The
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arguments are the error code, error string, and the objname the
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error occurred in. */
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typedef void (*receiver_fct) (int, const char *, const char *);
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/* Internal functions of the run-time dynamic linker.
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These can be accessed if you link again the dynamic linker
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as a shared library, as in `-lld' or `/lib/ld.so' explicitly;
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but are not normally of interest to user programs.
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The `-ldl' library functions in <dlfcn.h> provide a simple
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user interface to run-time dynamic linking. */
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#ifndef SHARED
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# define EXTERN extern
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# define GL(name) _##name
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#else
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# define EXTERN
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# ifdef IS_IN_rtld
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# define GL(name) _rtld_local._##name
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# else
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# define GL(name) _rtld_global._##name
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# endif
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struct rtld_global
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{
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#endif
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/* Don't change the order of the following elements. 'dl_loaded'
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must remain the first element. Forever. */
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/* And a pointer to the map for the main map. */
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EXTERN struct link_map *_dl_loaded;
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/* Number of object in the _dl_loaded list. */
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EXTERN unsigned int _dl_nloaded;
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/* Array representing global scope. */
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EXTERN struct r_scope_elem *_dl_global_scope[2];
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/* Direct pointer to the searchlist of the main object. */
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EXTERN struct r_scope_elem *_dl_main_searchlist;
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/* Copy of the content of `_dl_main_searchlist'. */
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EXTERN struct r_scope_elem _dl_initial_searchlist;
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/* This is zero at program start to signal that the global scope map is
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allocated by rtld. Later it keeps the size of the map. It might be
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reset if in _dl_close if the last global object is removed. */
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EXTERN size_t _dl_global_scope_alloc;
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/* If nonzero the appropriate debug information is printed. */
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EXTERN int _dl_debug_mask;
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#define DL_DEBUG_LIBS (1 << 0)
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#define DL_DEBUG_IMPCALLS (1 << 1)
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#define DL_DEBUG_BINDINGS (1 << 2)
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#define DL_DEBUG_SYMBOLS (1 << 3)
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#define DL_DEBUG_VERSIONS (1 << 4)
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#define DL_DEBUG_RELOC (1 << 5)
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#define DL_DEBUG_FILES (1 << 6)
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#define DL_DEBUG_STATISTICS (1 << 7)
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/* These two are used only internally. */
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#define DL_DEBUG_HELP (1 << 8)
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#define DL_DEBUG_PRELINK (1 << 9)
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/* Cached value of `getpagesize ()'. */
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EXTERN size_t _dl_pagesize;
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/* During the program run we must not modify the global data of
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loaded shared object simultanously in two threads. Therefore we
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protect `_dl_open' and `_dl_close' in dl-close.c.
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This must be a recursive lock since the initializer function of
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the loaded object might as well require a call to this function.
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At this time it is not anymore a problem to modify the tables. */
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__rtld_lock_define_recursive (EXTERN, _dl_load_lock)
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/* OS version. */
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EXTERN unsigned int _dl_osversion;
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/* Platform name. */
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EXTERN const char *_dl_platform;
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EXTERN size_t _dl_platformlen;
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#ifndef MAP_ANON
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/* File descriptor referring to the zero-fill device. */
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EXTERN int _dl_zerofd;
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#endif
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/* CLK_TCK as reported by the kernel. */
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EXTERN int _dl_clktck;
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/* If nonzero print warnings messages. */
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EXTERN int _dl_verbose;
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/* Do we do lazy relocations? */
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EXTERN int _dl_lazy;
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/* Nonzero if runtime lookups should not update the .got/.plt. */
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EXTERN int _dl_bind_not;
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/* Nonzero if references should be treated as weak during runtime
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linking. */
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EXTERN int _dl_dynamic_weak;
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/* Default floating-point control word. */
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EXTERN fpu_control_t _dl_fpu_control;
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/* The object to be initialized first. */
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EXTERN struct link_map *_dl_initfirst;
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#if HP_TIMING_AVAIL || HP_SMALL_TIMING_AVAIL
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/* Start time on CPU clock. */
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EXTERN hp_timing_t _dl_cpuclock_offset;
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/* Overhead of a high-precision timing measurement. */
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EXTERN hp_timing_t _dl_hp_timing_overhead;
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#endif
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/* Name of the shared object to be profiled (if any). */
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EXTERN const char *_dl_profile;
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/* Map of shared object to be profiled. */
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EXTERN struct link_map *_dl_profile_map;
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/* Filename of the output file. */
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EXTERN const char *_dl_profile_output;
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/* Map of shared object to be prelink traced. */
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EXTERN struct link_map *_dl_trace_prelink_map;
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/* Name of the object we want to trace the prelinking. */
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EXTERN const char *_dl_trace_prelink;
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/* Expected cache ID. */
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EXTERN int _dl_correct_cache_id;
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/* Counters for the number of relocations performed. */
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EXTERN unsigned long int _dl_num_relocations;
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EXTERN unsigned long int _dl_num_cache_relocations;
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/* Mask for hardware capabilities that are available. */
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EXTERN unsigned long int _dl_hwcap;
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/* Mask for important hardware capabilities we honour. */
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EXTERN unsigned long int _dl_hwcap_mask;
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/* Names of shared object for which the RPATH should be ignored. */
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EXTERN const char *_dl_inhibit_rpath;
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/* Location of the binary. */
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EXTERN const char *_dl_origin_path;
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/* List of search directories. */
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EXTERN struct r_search_path_elem *_dl_all_dirs;
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EXTERN struct r_search_path_elem *_dl_init_all_dirs;
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/* File descriptor to write debug messages to. */
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EXTERN int _dl_debug_fd;
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#ifdef _LIBC_REENTRANT
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EXTERN void **(*_dl_error_catch_tsd) (void) __attribute__ ((const));
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#endif
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/* Get architecture specific definitions. */
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#define PROCINFO_DECL
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#include <dl-procinfo.c>
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/* Structure describing the dynamic linker itself. */
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EXTERN struct link_map _dl_rtld_map;
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/* Keep the conditional TLS members at the end so the layout of the
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structure used by !USE_TLS code matches the prefix of the layout in
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the USE_TLS rtld. Note that `struct link_map' is conditionally
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defined as well, so _dl_rtld_map needs to be last before this. */
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#ifdef USE_TLS
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/* Highest dtv index currently needed. */
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EXTERN size_t _dl_tls_max_dtv_idx;
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/* Flag signalling whether there are gaps in the module ID allocation. */
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EXTERN bool _dl_tls_dtv_gaps;
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/* Information about the dtv slots. */
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EXTERN struct dtv_slotinfo_list
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{
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size_t len;
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struct dtv_slotinfo_list *next;
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struct dtv_slotinfo
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{
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size_t gen;
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struct link_map *map;
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} slotinfo[0];
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} *_dl_tls_dtv_slotinfo_list;
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/* Number of modules in the static TLS block. */
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EXTERN size_t _dl_tls_static_nelem;
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/* Size of the static TLS block. */
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EXTERN size_t _dl_tls_static_size;
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/* Size actually allocated in the static TLS block. */
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EXTERN size_t _dl_tls_static_used;
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/* Alignment requirement of the static TLS block. */
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EXTERN size_t _dl_tls_static_align;
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/* Number of additional entries in the slotinfo array of each slotinfo
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list element. A large number makes it almost certain take we never
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have to iterate beyond the first element in the slotinfo list. */
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# define TLS_SLOTINFO_SURPLUS (62)
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/* Number of additional slots in the dtv allocated. */
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# define DTV_SURPLUS (14)
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/* Initial dtv of the main thread, not allocated with normal malloc. */
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EXTERN void *_dl_initial_dtv;
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/* Generation counter for the dtv. */
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EXTERN size_t _dl_tls_generation;
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#endif
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#ifdef SHARED
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};
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# define __rtld_global_attribute__
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# ifdef IS_IN_rtld
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# ifdef HAVE_VISIBILITY_ATTRIBUTE
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# ifdef HAVE_SDATA_SECTION
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# define __rtld_local_attribute__ \
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__attribute__ ((visibility ("hidden"), section (".sdata")))
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# undef __rtld_global_attribute__
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# define __rtld_global_attribute__ __attribute__ ((section (".sdata")))
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# else
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# define __rtld_local_attribute__ __attribute__ ((visibility ("hidden")))
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# endif
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# else
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# define __rtld_local_attribute__
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# endif
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extern struct rtld_global _rtld_local __rtld_local_attribute__;
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# endif
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extern struct rtld_global _rtld_global __rtld_global_attribute__;
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#endif
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#undef EXTERN
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#ifdef IS_IN_rtld
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/* This is the initial value of GL(dl_error_catch_tsd).
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A non-TLS libpthread will change it. */
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extern void **_dl_initial_error_catch_tsd (void) __attribute__ ((const))
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attribute_hidden;
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#endif
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/* Parameters passed to the dynamic linker. */
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extern int _dl_argc attribute_hidden;
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extern char **_dl_argv;
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#ifdef IS_IN_rtld
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extern char **_dl_argv_internal attribute_hidden;
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# define rtld_progname (INTUSE(_dl_argv)[0])
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#else
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# define rtld_progname _dl_argv[0]
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#endif
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/* The array with message we print as a last resort. */
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extern const char _dl_out_of_memory[];
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#ifdef IS_IN_rtld
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/* XXX #ifdef should go away. */
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extern const char _dl_out_of_memory_internal[] attribute_hidden;
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#endif
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/* Flag set at startup and cleared when the last initializer has run. */
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extern int _dl_starting_up;
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weak_extern (_dl_starting_up)
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#ifdef IS_IN_rtld
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extern int _dl_starting_up_internal attribute_hidden;
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#endif
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/* OS-dependent function to open the zero-fill device. */
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extern int _dl_sysdep_open_zero_fill (void); /* dl-sysdep.c */
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/* Write message on the debug file descriptor. The parameters are
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interpreted as for a `printf' call. All the lines start with a
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tag showing the PID. */
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extern void _dl_debug_printf (const char *fmt, ...)
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__attribute__ ((__format__ (__printf__, 1, 2)));
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extern void _dl_debug_printf_internal (const char *fmt, ...)
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__attribute__ ((__format__ (__printf__, 1, 2)))
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attribute_hidden;
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/* Write message on the debug file descriptor. The parameters are
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interpreted as for a `printf' call. All the lines buf the first
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start with a tag showing the PID. */
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extern void _dl_debug_printf_c (const char *fmt, ...)
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__attribute__ ((__format__ (__printf__, 1, 2)));
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/* Write a message on the specified descriptor FD. The parameters are
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interpreted as for a `printf' call. */
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extern void _dl_dprintf (int fd, const char *fmt, ...)
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__attribute__ ((__format__ (__printf__, 2, 3)))
|
||
attribute_hidden;
|
||
|
||
/* Write a message on the specified descriptor standard output. The
|
||
parameters are interpreted as for a `printf' call. */
|
||
#define _dl_printf(fmt, args...) \
|
||
_dl_dprintf (STDOUT_FILENO, fmt, ##args)
|
||
|
||
/* Write a message on the specified descriptor standard error. The
|
||
parameters are interpreted as for a `printf' call. */
|
||
#define _dl_error_printf(fmt, args...) \
|
||
_dl_dprintf (STDERR_FILENO, fmt, ##args)
|
||
|
||
/* Write a message on the specified descriptor standard error and exit
|
||
the program. The parameters are interpreted as for a `printf' call. */
|
||
#define _dl_fatal_printf(fmt, args...) \
|
||
do \
|
||
{ \
|
||
_dl_dprintf (STDERR_FILENO, fmt, ##args); \
|
||
_exit (127); \
|
||
} \
|
||
while (1)
|
||
|
||
|
||
/* This function is called by all the internal dynamic linker functions
|
||
when they encounter an error. ERRCODE is either an `errno' code or
|
||
zero; OBJECT is the name of the problematical shared object, or null if
|
||
it is a general problem; ERRSTRING is a string describing the specific
|
||
problem. */
|
||
extern void _dl_signal_error (int errcode, const char *object,
|
||
const char *occurred, const char *errstring)
|
||
internal_function
|
||
__attribute__ ((__noreturn__));
|
||
extern void _dl_signal_error_internal (int errcode, const char *object,
|
||
const char *occurred,
|
||
const char *errstring)
|
||
internal_function __attribute__ ((__noreturn__)) attribute_hidden;
|
||
|
||
/* Like _dl_signal_error, but may return when called in the context of
|
||
_dl_receive_error. */
|
||
extern void _dl_signal_cerror (int errcode, const char *object,
|
||
const char *occation, const char *errstring)
|
||
internal_function;
|
||
|
||
/* Call OPERATE, receiving errors from `dl_signal_cerror'. Unlike
|
||
`_dl_catch_error' the operation is resumed after the OPERATE
|
||
function returns.
|
||
ARGS is passed as argument to OPERATE. */
|
||
extern void _dl_receive_error (receiver_fct fct, void (*operate) (void *),
|
||
void *args)
|
||
internal_function;
|
||
|
||
|
||
/* Open the shared object NAME and map in its segments.
|
||
LOADER's DT_RPATH is used in searching for NAME.
|
||
If the object is already opened, returns its existing map.
|
||
For preloaded shared objects PRELOADED is set to a non-zero
|
||
value to allow additional security checks. */
|
||
extern struct link_map *_dl_map_object (struct link_map *loader,
|
||
const char *name, int preloaded,
|
||
int type, int trace_mode, int mode)
|
||
internal_function;
|
||
extern struct link_map *_dl_map_object_internal (struct link_map *loader,
|
||
const char *name,
|
||
int preloaded,
|
||
int type, int trace_mode,
|
||
int mode)
|
||
internal_function attribute_hidden;
|
||
|
||
/* Call _dl_map_object on the dependencies of MAP, and set up
|
||
MAP->l_searchlist. PRELOADS points to a vector of NPRELOADS previously
|
||
loaded objects that will be inserted into MAP->l_searchlist after MAP
|
||
but before its dependencies. */
|
||
extern void _dl_map_object_deps (struct link_map *map,
|
||
struct link_map **preloads,
|
||
unsigned int npreloads, int trace_mode,
|
||
int open_mode)
|
||
internal_function;
|
||
extern void _dl_map_object_deps_internal (struct link_map *map,
|
||
struct link_map **preloads,
|
||
unsigned int npreloads,
|
||
int trace_mode, int open_mode)
|
||
internal_function attribute_hidden;
|
||
|
||
/* Cache the locations of MAP's hash table. */
|
||
extern void _dl_setup_hash (struct link_map *map)
|
||
internal_function attribute_hidden;
|
||
|
||
|
||
/* Search loaded objects' symbol tables for a definition of the symbol
|
||
referred to by UNDEF. *SYM is the symbol table entry containing the
|
||
reference; it is replaced with the defining symbol, and the base load
|
||
address of the defining object is returned. SYMBOL_SCOPE is a
|
||
null-terminated list of object scopes to search; each object's
|
||
l_searchlist (i.e. the segment of the dependency tree starting at that
|
||
object) is searched in turn. REFERENCE_NAME should name the object
|
||
containing the reference; it is used in error messages.
|
||
TYPE_CLASS describes the type of symbol we are looking for. */
|
||
extern lookup_t _dl_lookup_symbol (const char *undef,
|
||
struct link_map *undef_map,
|
||
const ElfW(Sym) **sym,
|
||
struct r_scope_elem *symbol_scope[],
|
||
int type_class, int flags)
|
||
internal_function;
|
||
extern lookup_t _dl_lookup_symbol_internal (const char *undef,
|
||
struct link_map *undef_map,
|
||
const ElfW(Sym) **sym,
|
||
struct r_scope_elem *symbolscope[],
|
||
int type_class, int flags)
|
||
internal_function attribute_hidden;
|
||
|
||
enum
|
||
{
|
||
/* If necessary add dependency between user and provider object. */
|
||
DL_LOOKUP_ADD_DEPENDENCY = 1,
|
||
/* Return most recent version instead of default version for
|
||
unversioned lookup. */
|
||
DL_LOOKUP_RETURN_NEWEST = 2
|
||
};
|
||
|
||
/* Lookup versioned symbol. */
|
||
extern lookup_t _dl_lookup_versioned_symbol (const char *undef,
|
||
struct link_map *undef_map,
|
||
const ElfW(Sym) **sym,
|
||
struct r_scope_elem *symbol_scope[],
|
||
const struct r_found_version *version,
|
||
int type_class, int explicit)
|
||
internal_function;
|
||
extern lookup_t _dl_lookup_versioned_symbol_internal (const char *undef,
|
||
struct link_map *undef_map,
|
||
const ElfW(Sym) **sym,
|
||
struct r_scope_elem *symbol_scope[],
|
||
const struct r_found_version *version,
|
||
int type_class,
|
||
int explicit)
|
||
internal_function attribute_hidden;
|
||
|
||
/* For handling RTLD_NEXT we must be able to skip shared objects. */
|
||
extern lookup_t _dl_lookup_symbol_skip (const char *undef,
|
||
struct link_map *undef_map,
|
||
const ElfW(Sym) **sym,
|
||
struct r_scope_elem *symbol_scope[],
|
||
struct link_map *skip_this)
|
||
internal_function;
|
||
|
||
/* For handling RTLD_NEXT with versioned symbols we must be able to
|
||
skip shared objects. */
|
||
extern lookup_t _dl_lookup_versioned_symbol_skip (const char *undef,
|
||
struct link_map *undef_map,
|
||
const ElfW(Sym) **sym,
|
||
struct r_scope_elem *symbol_scope[],
|
||
const struct r_found_version *version,
|
||
struct link_map *skip_this)
|
||
internal_function;
|
||
|
||
/* Look up symbol NAME in MAP's scope and return its run-time address. */
|
||
extern ElfW(Addr) _dl_symbol_value (struct link_map *map, const char *name)
|
||
internal_function;
|
||
|
||
/* Allocate a `struct link_map' for a new object being loaded,
|
||
and enter it into the _dl_main_map list. */
|
||
extern struct link_map *_dl_new_object (char *realname, const char *libname,
|
||
int type, struct link_map *loader)
|
||
internal_function attribute_hidden;
|
||
|
||
/* Relocate the given object (if it hasn't already been).
|
||
SCOPE is passed to _dl_lookup_symbol in symbol lookups.
|
||
If LAZY is nonzero, don't relocate its PLT. */
|
||
extern void _dl_relocate_object (struct link_map *map,
|
||
struct r_scope_elem *scope[],
|
||
int lazy, int consider_profiling);
|
||
extern void _dl_relocate_object_internal (struct link_map *map,
|
||
struct r_scope_elem *scope[],
|
||
int lazy, int consider_profiling)
|
||
attribute_hidden;
|
||
|
||
/* Call _dl_signal_error with a message about an unhandled reloc type.
|
||
TYPE is the result of ELFW(R_TYPE) (r_info), i.e. an R_<CPU>_* value.
|
||
PLT is nonzero if this was a PLT reloc; it just affects the message. */
|
||
extern void _dl_reloc_bad_type (struct link_map *map,
|
||
unsigned int type, int plt)
|
||
internal_function __attribute__ ((__noreturn__));
|
||
|
||
/* Resolve conflicts if prelinking. */
|
||
extern void _dl_resolve_conflicts (struct link_map *l,
|
||
ElfW(Rela) *conflict,
|
||
ElfW(Rela) *conflictend);
|
||
|
||
/* Check the version dependencies of all objects available through
|
||
MAP. If VERBOSE print some more diagnostics. */
|
||
extern int _dl_check_all_versions (struct link_map *map, int verbose,
|
||
int trace_mode)
|
||
internal_function;
|
||
|
||
/* Check the version dependencies for MAP. If VERBOSE print some more
|
||
diagnostics. */
|
||
extern int _dl_check_map_versions (struct link_map *map, int verbose,
|
||
int trace_mode)
|
||
internal_function;
|
||
|
||
/* Initialize the object in SCOPE by calling the constructors with
|
||
ARGC, ARGV, and ENV as the parameters. */
|
||
extern void _dl_init (struct link_map *main_map, int argc, char **argv,
|
||
char **env) internal_function;
|
||
|
||
/* Call the finalizer functions of all shared objects whose
|
||
initializer functions have completed. */
|
||
extern void _dl_fini (void) internal_function;
|
||
|
||
/* The dynamic linker calls this function before and having changing
|
||
any shared object mappings. The `r_state' member of `struct r_debug'
|
||
says what change is taking place. This function's address is
|
||
the value of the `r_brk' member. */
|
||
extern void _dl_debug_state (void);
|
||
extern void _dl_debug_state_internal (void) attribute_hidden;
|
||
|
||
/* Initialize `struct r_debug' if it has not already been done. The
|
||
argument is the run-time load address of the dynamic linker, to be put
|
||
in the `r_ldbase' member. Returns the address of the structure. */
|
||
extern struct r_debug *_dl_debug_initialize (ElfW(Addr) ldbase)
|
||
internal_function;
|
||
|
||
/* Initialize the basic data structure for the search paths. */
|
||
extern void _dl_init_paths (const char *library_path) internal_function;
|
||
|
||
/* Gather the information needed to install the profiling tables and start
|
||
the timers. */
|
||
extern void _dl_start_profile (struct link_map *map, const char *output_dir)
|
||
internal_function;
|
||
extern void _dl_start_profile_internal (struct link_map *map,
|
||
const char *output_dir)
|
||
internal_function attribute_hidden;
|
||
|
||
/* The actual functions used to keep book on the calls. */
|
||
extern void _dl_mcount (ElfW(Addr) frompc, ElfW(Addr) selfpc);
|
||
extern void _dl_mcount_internal (ElfW(Addr) frompc, ElfW(Addr) selfpc)
|
||
attribute_hidden;
|
||
|
||
/* This function is simply a wrapper around the _dl_mcount function
|
||
which does not require a FROMPC parameter since this is the
|
||
calling function. */
|
||
extern void _dl_mcount_wrapper (void *selfpc);
|
||
|
||
/* Show the members of the auxiliary array passed up from the kernel. */
|
||
extern void _dl_show_auxv (void) internal_function;
|
||
|
||
/* Return all environment variables starting with `LD_', one after the
|
||
other. */
|
||
extern char *_dl_next_ld_env_entry (char ***position) internal_function;
|
||
|
||
/* Return an array with the names of the important hardware capabilities. */
|
||
extern const struct r_strlenpair *_dl_important_hwcaps (const char *platform,
|
||
size_t paltform_len,
|
||
size_t *sz,
|
||
size_t *max_capstrlen)
|
||
internal_function;
|
||
|
||
/* Look up NAME in ld.so.cache and return the file name stored there,
|
||
or null if none is found. */
|
||
extern const char *_dl_load_cache_lookup (const char *name)
|
||
internal_function;
|
||
|
||
/* If the system does not support MAP_COPY we cannot leave the file open
|
||
all the time since this would create problems when the file is replaced.
|
||
Therefore we provide this function to close the file and open it again
|
||
once needed. */
|
||
extern void _dl_unload_cache (void);
|
||
extern void _dl_unload_cache_internal (void) attribute_hidden;
|
||
|
||
/* System-dependent function to read a file's whole contents in the
|
||
most convenient manner available. *SIZEP gets the size of the
|
||
file. On error MAP_FAILED is returned. */
|
||
extern void *_dl_sysdep_read_whole_file (const char *file, size_t *sizep,
|
||
int prot)
|
||
internal_function attribute_hidden;
|
||
|
||
/* System-specific function to do initial startup for the dynamic linker.
|
||
After this, file access calls and getenv must work. This is responsible
|
||
for setting __libc_enable_secure if we need to be secure (e.g. setuid),
|
||
and for setting _dl_argc and _dl_argv, and then calling _dl_main. */
|
||
extern ElfW(Addr) _dl_sysdep_start (void **start_argptr,
|
||
void (*dl_main) (const ElfW(Phdr) *phdr,
|
||
ElfW(Word) phnum,
|
||
ElfW(Addr) *user_entry))
|
||
attribute_hidden;
|
||
|
||
extern void _dl_sysdep_start_cleanup (void)
|
||
internal_function attribute_hidden;
|
||
|
||
|
||
/* Determine next available module ID. */
|
||
extern size_t _dl_next_tls_modid (void) internal_function attribute_hidden;
|
||
|
||
/* Calculate offset of the TLS blocks in the static TLS block. */
|
||
extern void _dl_determine_tlsoffset (void) internal_function attribute_hidden;
|
||
|
||
/* Set up the data structures for TLS, when they were not set up at startup.
|
||
Returns nonzero on malloc failure.
|
||
This is called from _dl_map_object_from_fd or by libpthread. */
|
||
extern int _dl_tls_setup (void) internal_function;
|
||
rtld_hidden_proto (_dl_tls_setup)
|
||
|
||
/* Allocate memory for static TLS block (unless MEM is nonzero) and dtv. */
|
||
extern void *_dl_allocate_tls (void *mem) internal_function;
|
||
|
||
/* Get size and alignment requirements of the static TLS block. */
|
||
extern void _dl_get_tls_static_info (size_t *sizep, size_t *alignp)
|
||
internal_function;
|
||
|
||
/* These are internal entry points to the two halves of _dl_allocate_tls,
|
||
only used within rtld.c itself at startup time. */
|
||
extern void *_dl_allocate_tls_storage (void)
|
||
internal_function attribute_hidden;
|
||
extern void *_dl_allocate_tls_init (void *) internal_function;
|
||
rtld_hidden_proto (_dl_allocate_tls_init)
|
||
|
||
/* Deallocate memory allocated with _dl_allocate_tls. */
|
||
extern void _dl_deallocate_tls (void *tcb, bool dealloc_tcb) internal_function;
|
||
|
||
/* Return the symbol address given the map of the module it is in and
|
||
the symbol record. */
|
||
extern void *_dl_tls_symaddr (struct link_map *map, const ElfW(Sym) *ref)
|
||
internal_function;
|
||
|
||
__END_DECLS
|
||
|
||
#endif /* ldsodefs.h */
|