Skip to content
Navigation Menu
Toggle navigation
Sign in
In this repository
All GitHub Enterprise
↵
Jump to
↵
No suggested jump to results
In this repository
All GitHub Enterprise
↵
Jump to
↵
In this organization
All GitHub Enterprise
↵
Jump to
↵
In this repository
All GitHub Enterprise
↵
Jump to
↵
Sign in
Reseting focus
You signed in with another tab or window.
Reload
to refresh your session.
You signed out in another tab or window.
Reload
to refresh your session.
You switched accounts on another tab or window.
Reload
to refresh your session.
Dismiss alert
{{ message }}
git-mirror
/
glibc
Public
Notifications
You must be signed in to change notification settings
Fork
0
Star
0
Code
Pull requests
0
Actions
Projects
0
Security
Insights
Additional navigation options
Code
Pull requests
Actions
Projects
Security
Insights
Files
a1ce84f
abilist
aout
argp
assert
bits
c_stubs
catgets
conf
conform
crypt
csu
ctype
debug
dirent
dlfcn
elf
fedora
gmon
gnulib
grp
hesiod
hurd
iconv
iconvdata
include
arpa
bits
gnu
net
netinet
protocols
rpc
rpcsvc
sys
aio.h
aliases.h
alloca.h
argp.h
argz.h
assert.h
atomic.h
byteswap.h
caller.h
complex.h
ctype.h
des.h
dirent.h
dlfcn.h
elf.h
endian.h
envz.h
err.h
errno.h
error.h
execinfo.h
fcntl.h
features.h
fenv.h
fnmatch.h
fpu_control.h
ftw.h
gconv.h
getopt.h
getopt_int.h
glob.h
gmp.h
gnu-versions.h
grp.h
iconv.h
ifaddrs.h
langinfo.h
libc-internal.h
libc-symbols.h
libgen.h
libintl.h
libio.h
limits.h
link.h
locale.h
malloc.h
math.h
mcheck.h
memory.h
mntent.h
monetary.h
mqueue.h
netdb.h
netgroup.h
nl_types.h
nss.h
nsswitch.h
obstack.h
poll.h
printf.h
pthread.h
pty.h
pwd.h
regex.h
resolv.h
sched.h
search.h
set-hooks.h
setjmp.h
sgtty.h
shadow.h
shlib-compat.h
signal.h
spawn.h
stab.h
stdio.h
stdio_ext.h
stdlib.h
string.h
strings.h
stub-tag.h
stubs-biarch.h
stubs-prologue.h
syscall.h
sysexits.h
syslog.h
tar.h
termios.h
tgmath.h
time.h
tls.h
ttyent.h
ucontext.h
ulimit.h
unistd.h
utime.h
utmp.h
values.h
wchar.h
wctype.h
wordexp.h
xlocale.h
inet
intl
io
libidn
libio
locale
localedata
login
mach
malloc
manual
math
misc
nis
nptl
nptl_db
nscd
nss
po
posix
powerpc-cpu
pwd
resolv
resource
rt
rtkaio
scripts
setjmp
shadow
signal
socket
soft-fp
stdio-common
stdlib
streams
string
sunrpc
sysdeps
sysvipc
termios
time
timezone
wcsmbs
wctype
.cvsignore
BUGS
CANCEL-FCT-WAIVE
CANCEL-FILE-WAIVE
CONFORMANCE
COPYING
COPYING.LIB
ChangeLog
ChangeLog.1
ChangeLog.10
ChangeLog.11
ChangeLog.12
ChangeLog.13
ChangeLog.14
ChangeLog.15
ChangeLog.16
ChangeLog.2
ChangeLog.3
ChangeLog.4
ChangeLog.5
ChangeLog.6
ChangeLog.7
ChangeLog.8
ChangeLog.9
FAQ
FAQ.in
INSTALL
LICENSES
Makeconfig
Makefile
Makefile.in
Makerules
NAMESPACE
NEWS
NOTES
PROJECTS
README
README.libm
README.template
Rules
Versions.def
WUR-REPORT
abi-tags
aclocal.m4
config-name.in
config.h.in
config.make.in
configure
configure.in
cppflags-iterator.mk
extra-lib.mk
extra-modules.mk
o-iterator.mk
shlib-versions
test-skeleton.c
tls.make.c
version.h
Breadcrumbs
glibc
/
include
/
link.h
Blame
Blame
Latest commit
History
History
311 lines (256 loc) · 10.7 KB
Breadcrumbs
glibc
/
include
/
link.h
Top
File metadata and controls
Code
Blame
311 lines (256 loc) · 10.7 KB
Raw
/* Data structure for communication from the run-time dynamic linker for loaded ELF shared objects. Copyright (C) 1995-2006, 2007 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #ifndef _PRIVATE_LINK_H #define _PRIVATE_LINK_H 1 #ifdef _LINK_H # error this should be impossible #endif /* 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 #include <elf/link.h> #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 <stddef.h> #include <bits/linkmap.h> #include <dl-lookupcfg.h> #include <tls.h> #include <bits/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; /* 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. */ /* 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_used:1; /* Nonzero if the DSO is used. */ 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. */ /* 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. */ dev_t l_dev; ino64_t l_ino; /* 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. */ unsigned int l_reldepsmax; unsigned int l_reldepsact; struct link_map **l_reldeps; /* 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 /* 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; /* Information used to change permission after the relocations are done. */ ElfW(Addr) l_relro_addr; size_t l_relro_size; /* 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); #endif /* include/link.h */
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
You can’t perform that action at this time.