mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 22:40:05 +00:00
581c785bf3
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 7061 files FOO. I then removed trailing white space from math/tgmath.h, support/tst-support-open-dev-null-range.c, and sysdeps/x86_64/multiarch/strlen-vec.S, to work around the following obscure pre-commit check failure diagnostics from Savannah. I don't know why I run into these diagnostics whereas others evidently do not. remote: *** 912-#endif remote: *** 913: remote: *** 914- remote: *** error: lines with trailing whitespace found ... remote: *** error: sysdeps/unix/sysv/linux/statx_cp.c: trailing lines
393 lines
14 KiB
C
393 lines
14 KiB
C
/* Data structure for communication from the run-time dynamic linker for
|
|
loaded ELF shared objects.
|
|
Copyright (C) 1995-2022 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
|
|
<https://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;
|
|
};
|
|
|
|
/* Search path information computed by _dl_init_paths. */
|
|
extern struct r_search_path_struct __rtld_search_dirs attribute_hidden;
|
|
extern struct r_search_path_struct __rtld_env_path_list attribute_hidden;
|
|
|
|
/* 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_main_map:1; /* Nonzero for the map of the main program. */
|
|
unsigned int l_visited:1; /* Used internally for map dependency
|
|
graph traversal. */
|
|
unsigned int l_map_used:1; /* These two bits are used during traversal */
|
|
unsigned int l_map_done:1; /* of maps in _dl_close_worker. */
|
|
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. */
|
|
unsigned int l_ld_readonly:1; /* Nonzero if dynamic section is readonly. */
|
|
unsigned int l_find_object_processed:1; /* Zero if _dl_find_object_update
|
|
needs to process this
|
|
lt_library map. */
|
|
|
|
/* NODELETE status of the map. Only valid for maps of type
|
|
lt_loaded. Lazy binding sets l_nodelete_active directly,
|
|
potentially from signal handlers. Initial loading of an
|
|
DF_1_NODELETE object set l_nodelete_pending. Relocation may
|
|
set l_nodelete_pending as well. l_nodelete_pending maps are
|
|
promoted to l_nodelete_active status in the final stages of
|
|
dlopen, prior to calling ELF constructors. dlclose only
|
|
refuses to unload l_nodelete_active maps, the pending status is
|
|
ignored. */
|
|
bool l_nodelete_active;
|
|
bool l_nodelete_pending;
|
|
|
|
#include <link_map.h>
|
|
|
|
/* 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;
|
|
/* CONCURRENCY NOTE: This is used to guard the concurrent initialization
|
|
of the relocation result across multiple threads. See the more
|
|
detailed notes in elf/dl-runtime.c. */
|
|
unsigned int init;
|
|
} *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;
|
|
};
|
|
|
|
#include <dl-relocate-ld.h>
|
|
|
|
/* Information used by audit modules. For most link maps, this data
|
|
immediate follows the link map in memory. For the dynamic linker,
|
|
it is allocated separately. See link_map_audit_state in
|
|
<ldsodefs.h>. */
|
|
struct auditstate
|
|
{
|
|
uintptr_t cookie;
|
|
unsigned int bindflags;
|
|
};
|
|
|
|
|
|
/* This is the hidden instance of struct r_debug_extended used by the
|
|
dynamic linker. */
|
|
extern struct r_debug_extended _r_debug_extended attribute_hidden;
|
|
|
|
#if __ELF_NATIVE_CLASS == 32
|
|
# define symbind symbind32
|
|
# define LA_SYMBIND "la_symbind32"
|
|
#elif __ELF_NATIVE_CLASS == 64
|
|
# define symbind symbind64
|
|
# define LA_SYMBIND "la_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);
|
|
hidden_proto (__dl_iterate_phdr)
|
|
|
|
/* 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 */
|