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Diffstat (limited to 'include/link.h')
| -rw-r--r-- | include/link.h | 351 |
1 files changed, 0 insertions, 351 deletions
diff --git a/include/link.h b/include/link.h deleted file mode 100644 index eeb5f4d53b..0000000000 --- a/include/link.h +++ /dev/null @@ -1,351 +0,0 @@ -/* Data structure for communication from the run-time dynamic linker for - loaded ELF shared objects. - Copyright (C) 1995-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - <http://www.gnu.org/licenses/>. */ - -#ifndef _PRIVATE_LINK_H -#define _PRIVATE_LINK_H 1 - -#ifdef _LINK_H -# error this should be impossible -#endif - -# ifndef _ISOMAC -/* Get most of the contents from the public header, but we define a - different `struct link_map' type for private use. The la_objopen - prototype uses the type, so we have to declare it separately. */ -# define link_map link_map_public -# define la_objopen la_objopen_wrongproto -# endif - -#include <elf/link.h> - -# ifndef _ISOMAC - -#undef link_map -#undef la_objopen - -struct link_map; -extern unsigned int la_objopen (struct link_map *__map, Lmid_t __lmid, - uintptr_t *__cookie); - -#include <stdint.h> -#include <stddef.h> -#include <linkmap.h> -#include <dl-fileid.h> -#include <dl-lookupcfg.h> -#include <tls.h> -#include <libc-lock.h> - - -/* Some internal data structures of the dynamic linker used in the - linker map. We only provide forward declarations. */ -struct libname_list; -struct r_found_version; -struct r_search_path_elem; - -/* Forward declaration. */ -struct link_map; - -/* Structure to describe a single list of scope elements. The lookup - functions get passed an array of pointers to such structures. */ -struct r_scope_elem -{ - /* Array of maps for the scope. */ - struct link_map **r_list; - /* Number of entries in the scope. */ - unsigned int r_nlist; -}; - - -/* Structure to record search path and allocation mechanism. */ -struct r_search_path_struct - { - struct r_search_path_elem **dirs; - int malloced; - }; - - -/* Structure describing a loaded shared object. The `l_next' and `l_prev' - members form a chain of all the shared objects loaded at startup. - - These data structures exist in space used by the run-time dynamic linker; - modifying them may have disastrous results. - - This data structure might change in future, if necessary. User-level - programs must avoid defining objects of this type. */ - -struct link_map - { - /* These first few members are part of the protocol with the debugger. - This is the same format used in SVR4. */ - - ElfW(Addr) l_addr; /* Difference between the address in the ELF - file and the addresses in memory. */ - char *l_name; /* Absolute file name object was found in. */ - ElfW(Dyn) *l_ld; /* Dynamic section of the shared object. */ - struct link_map *l_next, *l_prev; /* Chain of loaded objects. */ - - /* All following members are internal to the dynamic linker. - They may change without notice. */ - - /* This is an element which is only ever different from a pointer to - the very same copy of this type for ld.so when it is used in more - than one namespace. */ - struct link_map *l_real; - - /* Number of the namespace this link map belongs to. */ - Lmid_t l_ns; - - struct libname_list *l_libname; - /* Indexed pointers to dynamic section. - [0,DT_NUM) are indexed by the processor-independent tags. - [DT_NUM,DT_NUM+DT_THISPROCNUM) are indexed by the tag minus DT_LOPROC. - [DT_NUM+DT_THISPROCNUM,DT_NUM+DT_THISPROCNUM+DT_VERSIONTAGNUM) are - indexed by DT_VERSIONTAGIDX(tagvalue). - [DT_NUM+DT_THISPROCNUM+DT_VERSIONTAGNUM, - DT_NUM+DT_THISPROCNUM+DT_VERSIONTAGNUM+DT_EXTRANUM) are indexed by - DT_EXTRATAGIDX(tagvalue). - [DT_NUM+DT_THISPROCNUM+DT_VERSIONTAGNUM+DT_EXTRANUM, - DT_NUM+DT_THISPROCNUM+DT_VERSIONTAGNUM+DT_EXTRANUM+DT_VALNUM) are - indexed by DT_VALTAGIDX(tagvalue) and - [DT_NUM+DT_THISPROCNUM+DT_VERSIONTAGNUM+DT_EXTRANUM+DT_VALNUM, - DT_NUM+DT_THISPROCNUM+DT_VERSIONTAGNUM+DT_EXTRANUM+DT_VALNUM+DT_ADDRNUM) - are indexed by DT_ADDRTAGIDX(tagvalue), see <elf.h>. */ - - ElfW(Dyn) *l_info[DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM - + DT_EXTRANUM + DT_VALNUM + DT_ADDRNUM]; - const ElfW(Phdr) *l_phdr; /* Pointer to program header table in core. */ - ElfW(Addr) l_entry; /* Entry point location. */ - ElfW(Half) l_phnum; /* Number of program header entries. */ - ElfW(Half) l_ldnum; /* Number of dynamic segment entries. */ - - /* Array of DT_NEEDED dependencies and their dependencies, in - dependency order for symbol lookup (with and without - duplicates). There is no entry before the dependencies have - been loaded. */ - struct r_scope_elem l_searchlist; - - /* We need a special searchlist to process objects marked with - DT_SYMBOLIC. */ - struct r_scope_elem l_symbolic_searchlist; - - /* Dependent object that first caused this object to be loaded. */ - struct link_map *l_loader; - - /* Array with version names. */ - struct r_found_version *l_versions; - unsigned int l_nversions; - - /* Symbol hash table. */ - Elf_Symndx l_nbuckets; - Elf32_Word l_gnu_bitmask_idxbits; - Elf32_Word l_gnu_shift; - const ElfW(Addr) *l_gnu_bitmask; - union - { - const Elf32_Word *l_gnu_buckets; - const Elf_Symndx *l_chain; - }; - union - { - const Elf32_Word *l_gnu_chain_zero; - const Elf_Symndx *l_buckets; - }; - - unsigned int l_direct_opencount; /* Reference count for dlopen/dlclose. */ - enum /* Where this object came from. */ - { - lt_executable, /* The main executable program. */ - lt_library, /* Library needed by main executable. */ - lt_loaded /* Extra run-time loaded shared object. */ - } l_type:2; - unsigned int l_relocated:1; /* Nonzero if object's relocations done. */ - unsigned int l_init_called:1; /* Nonzero if DT_INIT function called. */ - unsigned int l_global:1; /* Nonzero if object in _dl_global_scope. */ - unsigned int l_reserved:2; /* Reserved for internal use. */ - unsigned int l_phdr_allocated:1; /* Nonzero if the data structure pointed - to by `l_phdr' is allocated. */ - unsigned int l_soname_added:1; /* Nonzero if the SONAME is for sure in - the l_libname list. */ - unsigned int l_faked:1; /* Nonzero if this is a faked descriptor - without associated file. */ - unsigned int l_need_tls_init:1; /* Nonzero if GL(dl_init_static_tls) - should be called on this link map - when relocation finishes. */ - unsigned int l_auditing:1; /* Nonzero if the DSO is used in auditing. */ - unsigned int l_audit_any_plt:1; /* Nonzero if at least one audit module - is interested in the PLT interception.*/ - unsigned int l_removed:1; /* Nozero if the object cannot be used anymore - since it is removed. */ - unsigned int l_contiguous:1; /* Nonzero if inter-segment holes are - mprotected or if no holes are present at - all. */ - unsigned int l_symbolic_in_local_scope:1; /* Nonzero if l_local_scope - during LD_TRACE_PRELINKING=1 - contains any DT_SYMBOLIC - libraries. */ - unsigned int l_free_initfini:1; /* Nonzero if l_initfini can be - freed, ie. not allocated with - the dummy malloc in ld.so. */ - - /* Collected information about own RPATH directories. */ - struct r_search_path_struct l_rpath_dirs; - - /* Collected results of relocation while profiling. */ - struct reloc_result - { - DL_FIXUP_VALUE_TYPE addr; - struct link_map *bound; - unsigned int boundndx; - uint32_t enterexit; - unsigned int flags; - } *l_reloc_result; - - /* Pointer to the version information if available. */ - ElfW(Versym) *l_versyms; - - /* String specifying the path where this object was found. */ - const char *l_origin; - - /* Start and finish of memory map for this object. l_map_start - need not be the same as l_addr. */ - ElfW(Addr) l_map_start, l_map_end; - /* End of the executable part of the mapping. */ - ElfW(Addr) l_text_end; - - /* Default array for 'l_scope'. */ - struct r_scope_elem *l_scope_mem[4]; - /* Size of array allocated for 'l_scope'. */ - size_t l_scope_max; - /* This is an array defining the lookup scope for this link map. - There are initially at most three different scope lists. */ - struct r_scope_elem **l_scope; - - /* A similar array, this time only with the local scope. This is - used occasionally. */ - struct r_scope_elem *l_local_scope[2]; - - /* This information is kept to check for sure whether a shared - object is the same as one already loaded. */ - struct r_file_id l_file_id; - - /* Collected information about own RUNPATH directories. */ - struct r_search_path_struct l_runpath_dirs; - - /* List of object in order of the init and fini calls. */ - struct link_map **l_initfini; - - /* List of the dependencies introduced through symbol binding. */ - struct link_map_reldeps - { - unsigned int act; - struct link_map *list[]; - } *l_reldeps; - unsigned int l_reldepsmax; - - /* Nonzero if the DSO is used. */ - unsigned int l_used; - - /* Various flag words. */ - ElfW(Word) l_feature_1; - ElfW(Word) l_flags_1; - ElfW(Word) l_flags; - - /* Temporarily used in `dl_close'. */ - int l_idx; - - struct link_map_machine l_mach; - - struct - { - const ElfW(Sym) *sym; - int type_class; - struct link_map *value; - const ElfW(Sym) *ret; - } l_lookup_cache; - - /* Thread-local storage related info. */ - - /* Start of the initialization image. */ - void *l_tls_initimage; - /* Size of the initialization image. */ - size_t l_tls_initimage_size; - /* Size of the TLS block. */ - size_t l_tls_blocksize; - /* Alignment requirement of the TLS block. */ - size_t l_tls_align; - /* Offset of first byte module alignment. */ - size_t l_tls_firstbyte_offset; -#ifndef NO_TLS_OFFSET -# define NO_TLS_OFFSET 0 -#endif -#ifndef FORCED_DYNAMIC_TLS_OFFSET -# if NO_TLS_OFFSET == 0 -# define FORCED_DYNAMIC_TLS_OFFSET -1 -# elif NO_TLS_OFFSET == -1 -# define FORCED_DYNAMIC_TLS_OFFSET -2 -# else -# error "FORCED_DYNAMIC_TLS_OFFSET is not defined" -# endif -#endif - /* For objects present at startup time: offset in the static TLS block. */ - ptrdiff_t l_tls_offset; - /* Index of the module in the dtv array. */ - size_t l_tls_modid; - - /* Number of thread_local objects constructed by this DSO. This is - atomically accessed and modified and is not always protected by the load - lock. See also: CONCURRENCY NOTES in cxa_thread_atexit_impl.c. */ - size_t l_tls_dtor_count; - - /* Information used to change permission after the relocations are - done. */ - ElfW(Addr) l_relro_addr; - size_t l_relro_size; - - unsigned long long int l_serial; - - /* Audit information. This array apparent must be the last in the - structure. Never add something after it. */ - struct auditstate - { - uintptr_t cookie; - unsigned int bindflags; - } l_audit[0]; - }; - - -#if __ELF_NATIVE_CLASS == 32 -# define symbind symbind32 -#elif __ELF_NATIVE_CLASS == 64 -# define symbind symbind64 -#else -# error "__ELF_NATIVE_CLASS must be defined" -#endif - -extern int __dl_iterate_phdr (int (*callback) (struct dl_phdr_info *info, - size_t size, void *data), - void *data); - -/* We use this macro to refer to ELF macros independent of the native - wordsize. `ELFW(R_TYPE)' is used in place of `ELF32_R_TYPE' or - `ELF64_R_TYPE'. */ -#define ELFW(type) _ElfW (ELF, __ELF_NATIVE_CLASS, type) - -# endif /* !_ISOMAC */ -#endif /* include/link.h */ |