*/
extern ElfW(Dyn) _DYNAMIC[];
-
-/* 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;
-
- /* Array of maps which also includes duplicates. */
- struct link_map **r_duplist;
- /* Number of elements in this list. */
- unsigned int r_nduplist;
-};
-
-
/* 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. */
+ modifying them may have disastrous results. */
struct link_map
{
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. */
-
- 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_EXTRANUM) are indexed
- by DT_EXTRATAGIDX(tagvalue) and
- [DT_NUM+DT_THISPROCNUM+DT_VERSIONTAGNUM,
- DT_NUM+DT_THISPROCNUM+DT_VERSIONTAGNUM+DT_EXTRANUM)
- are indexed by DT_EXTRATAGIDX(tagvalue) (see <elf.h>). */
-
- ElfW(Dyn) *l_info[DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM
- + DT_EXTRANUM];
- 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;
-
- /* Symbol hash table. */
- Elf_Symndx l_nbuckets;
- const Elf_Symndx *l_buckets, *l_chain;
-
- unsigned int l_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. */
-
- /* Array with version names. */
- unsigned int l_nversions;
- struct r_found_version *l_versions;
-
- /* Collected information about own RPATH directories. */
- struct r_search_path_elem **l_rpath_dirs;
-
- /* Collected results of relocation while profiling. */
- ElfW(Addr) *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;
-
- /* This is an array defining the lookup scope for this link map.
- There are at most three different scope lists. */
- struct r_scope_elem *l_scope[4];
-
- /* 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. */
- dev_t l_dev;
- ino_t l_ino;
-
- /* Collected information about own RUNPATH directories. */
- struct r_search_path_elem **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. */
- unsigned int l_reldepsmax;
- unsigned int l_reldepsact;
- struct link_map **l_reldeps;
};
#endif /* link.h */
-#include <elf/link.h>
+/* Data structure for communication from the run-time dynamic linker for
+ loaded ELF shared objects.
+ Copyright (C) 1995-1999, 2000 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#ifndef _LINK_H
+#define _LINK_H 1
+
+#include <features.h>
+#include <elf.h>
+#include <dlfcn.h>
+#include <sys/types.h>
+
+/* We use this macro to refer to ELF types independent of the native wordsize.
+ `ElfW(TYPE)' is used in place of `Elf32_TYPE' or `Elf64_TYPE'. */
+#define ElfW(type) _ElfW (Elf, __ELF_NATIVE_CLASS, type)
+#define _ElfW(e,w,t) _ElfW_1 (e, w, _##t)
+#define _ElfW_1(e,w,t) e##w##t
+
+#include <bits/elfclass.h> /* Defines __ELF_NATIVE_CLASS. */
+
+/* Rendezvous structure used by the run-time dynamic linker to communicate
+ details of shared object loading to the debugger. If the executable's
+ dynamic section has a DT_DEBUG element, the run-time linker sets that
+ element's value to the address where this structure can be found. */
+
+struct r_debug
+ {
+ int r_version; /* Version number for this protocol. */
+
+ struct link_map *r_map; /* Head of the chain of loaded objects. */
+
+ /* This is the address of a function internal to the run-time linker,
+ that will always be called when the linker begins to map in a
+ library or unmap it, and again when the mapping change is complete.
+ The debugger can set a breakpoint at this address if it wants to
+ notice shared object mapping changes. */
+ ElfW(Addr) r_brk;
+ enum
+ {
+ /* This state value describes the mapping change taking place when
+ the `r_brk' address is called. */
+ RT_CONSISTENT, /* Mapping change is complete. */
+ RT_ADD, /* Beginning to add a new object. */
+ RT_DELETE /* Beginning to remove an object mapping. */
+ } r_state;
+
+ ElfW(Addr) r_ldbase; /* Base address the linker is loaded at. */
+ };
+
+/* This is the instance of that structure used by the dynamic linker. */
+extern struct r_debug _r_debug;
+
+/* This symbol refers to the "dynamic structure" in the `.dynamic' section
+ of whatever module refers to `_DYNAMIC'. So, to find its own
+ `struct r_debug', a program could do:
+ for (dyn = _DYNAMIC; dyn->d_tag != DT_NULL; ++dyn)
+ if (dyn->d_tag == DT_DEBUG)
+ r_debug = (struct r_debug *) dyn->d_un.d_ptr;
+ */
+extern ElfW(Dyn) _DYNAMIC[];
+
+
+/* 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;
+
+ /* Array of maps which also includes duplicates. */
+ struct link_map **r_duplist;
+ /* Number of elements in this list. */
+ unsigned int r_nduplist;
+};
+
+
+/* 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; /* Base address shared object is loaded at. */
+ 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. */
+
+ 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_EXTRANUM) are indexed
+ by DT_EXTRATAGIDX(tagvalue) and
+ [DT_NUM+DT_THISPROCNUM+DT_VERSIONTAGNUM,
+ DT_NUM+DT_THISPROCNUM+DT_VERSIONTAGNUM+DT_EXTRANUM)
+ are indexed by DT_EXTRATAGIDX(tagvalue) (see <elf.h>). */
+
+ ElfW(Dyn) *l_info[DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM
+ + DT_EXTRANUM];
+ 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;
+
+ /* Symbol hash table. */
+ Elf_Symndx l_nbuckets;
+ const Elf_Symndx *l_buckets, *l_chain;
+
+ unsigned int l_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. */
+
+ /* Array with version names. */
+ unsigned int l_nversions;
+ struct r_found_version *l_versions;
+
+ /* Collected information about own RPATH directories. */
+ struct r_search_path_elem **l_rpath_dirs;
+
+ /* Collected results of relocation while profiling. */
+ ElfW(Addr) *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;
+
+ /* This is an array defining the lookup scope for this link map.
+ There are at most three different scope lists. */
+ struct r_scope_elem *l_scope[4];
+
+ /* 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. */
+ dev_t l_dev;
+ ino_t l_ino;
+
+ /* Collected information about own RUNPATH directories. */
+ struct r_search_path_elem **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. */
+ unsigned int l_reldepsmax;
+ unsigned int l_reldepsact;
+ struct link_map **l_reldeps;
+ };
+
+#endif /* link.h */
projects / thirdparty / glibc.git / commitdiff
