1READELF(1)                   GNU Development Tools                  READELF(1)
2
3
4

NAME

6       readelf - display information about ELF files
7

SYNOPSIS

9       readelf [-a|--all]
10               [-h|--file-header]
11               [-l|--program-headers|--segments]
12               [-S|--section-headers|--sections]
13               [-g|--section-groups]
14               [-t|--section-details]
15               [-e|--headers]
16               [-s|--syms|--symbols]
17               [--dyn-syms|--lto-syms]
18               [--sym-base=[0|8|10|16]]
19               [--demangle=style|--no-demangle]
20               [--quiet]
21               [--recurse-limit|--no-recurse-limit]
22               [-U method|--unicode=method]
23               [-n|--notes]
24               [-r|--relocs]
25               [-u|--unwind]
26               [-d|--dynamic]
27               [-V|--version-info]
28               [-A|--arch-specific]
29               [-D|--use-dynamic]
30               [-L|--lint|--enable-checks]
31               [-x <number or name>|--hex-dump=<number or name>]
32               [-p <number or name>|--string-dump=<number or name>]
33               [-R <number or name>|--relocated-dump=<number or name>]
34               [-z|--decompress]
35               [-c|--archive-index]
36               [-w[lLiaprmfFsoORtUuTgAck]|
37                --debug-dump[=rawline,=decodedline,=info,=abbrev,=pubnames,=aranges,=macro,=frames,=frames-interp,=str,=str-offsets,=loc,=Ranges,=pubtypes,=trace_info,=trace_abbrev,=trace_aranges,=gdb_index,=addr,=cu_index,=links]]
38               [-wK|--debug-dump=follow-links]
39               [-wN|--debug-dump=no-follow-links]
40               [-wD|--debug-dump=use-debuginfod]
41               [-wE|--debug-dump=do-not-use-debuginfod]
42               [-P|--process-links]
43               [--dwarf-depth=n]
44               [--dwarf-start=n]
45               [--ctf=section]
46               [--ctf-parent=section]
47               [--ctf-symbols=section]
48               [--ctf-strings=section]
49               [-I|--histogram]
50               [-v|--version]
51               [-W|--wide]
52               [-T|--silent-truncation]
53               [-H|--help]
54               elffile...
55

DESCRIPTION

57       readelf displays information about one or more ELF format object files.
58       The options control what particular information to display.
59
60       elffile... are the object files to be examined.  32-bit and 64-bit ELF
61       files are supported, as are archives containing ELF files.
62
63       This program performs a similar function to objdump but it goes into
64       more detail and it exists independently of the BFD library, so if there
65       is a bug in BFD then readelf will not be affected.
66

OPTIONS

68       The long and short forms of options, shown here as alternatives, are
69       equivalent.  At least one option besides -v or -H must be given.
70
71       -a
72       --all
73           Equivalent to specifying --file-header, --program-headers,
74           --sections, --symbols, --relocs, --dynamic, --notes,
75           --version-info, --arch-specific, --unwind, --section-groups and
76           --histogram.
77
78           Note - this option does not enable --use-dynamic itself, so if that
79           option is not present on the command line then dynamic symbols and
80           dynamic relocs will not be displayed.
81
82       -h
83       --file-header
84           Displays the information contained in the ELF header at the start
85           of the file.
86
87       -l
88       --program-headers
89       --segments
90           Displays the information contained in the file's segment headers,
91           if it has any.
92
93       --quiet
94           Suppress "no symbols" diagnostic.
95
96       -S
97       --sections
98       --section-headers
99           Displays the information contained in the file's section headers,
100           if it has any.
101
102       -g
103       --section-groups
104           Displays the information contained in the file's section groups, if
105           it has any.
106
107       -t
108       --section-details
109           Displays the detailed section information. Implies -S.
110
111       -s
112       --symbols
113       --syms
114           Displays the entries in symbol table section of the file, if it has
115           one.  If a symbol has version information associated with it then
116           this is displayed as well.  The version string is displayed as a
117           suffix to the symbol name, preceded by an @ character.  For example
118           foo@VER_1.  If the version is the default version to be used when
119           resolving unversioned references to the symbol then it is displayed
120           as a suffix preceded by two @ characters.  For example foo@@VER_2.
121
122       --dyn-syms
123           Displays the entries in dynamic symbol table section of the file,
124           if it has one.  The output format is the same as the format used by
125           the --syms option.
126
127       --lto-syms
128           Displays the contents of any LTO symbol tables in the file.
129
130       --sym-base=[0|8|10|16]
131           Forces the size field of the symbol table to use the given base.
132           Any unrecognized options will be treated as 0.  --sym-base=0
133           represents the default and legacy behaviour.  This will output
134           sizes as decimal for numbers less than 100000.  For sizes 100000
135           and greater hexadecimal notation will be used with a 0x prefix.
136           --sym-base=8 will give the symbol sizes in octal.  --sym-base=10
137           will always give the symbol sizes in decimal.  --sym-base=16 will
138           always give the symbol sizes in hexadecimal with a 0x prefix.
139
140       -C
141       --demangle[=style]
142           Decode (demangle) low-level symbol names into user-level names.
143           This makes C++ function names readable.  Different compilers have
144           different mangling styles.  The optional demangling style argument
145           can be used to choose an appropriate demangling style for your
146           compiler.
147
148       --no-demangle
149           Do not demangle low-level symbol names.  This is the default.
150
151       --recurse-limit
152       --no-recurse-limit
153       --recursion-limit
154       --no-recursion-limit
155           Enables or disables a limit on the amount of recursion performed
156           whilst demangling strings.  Since the name mangling formats allow
157           for an infinite level of recursion it is possible to create strings
158           whose decoding will exhaust the amount of stack space available on
159           the host machine, triggering a memory fault.  The limit tries to
160           prevent this from happening by restricting recursion to 2048 levels
161           of nesting.
162
163           The default is for this limit to be enabled, but disabling it may
164           be necessary in order to demangle truly complicated names.  Note
165           however that if the recursion limit is disabled then stack
166           exhaustion is possible and any bug reports about such an event will
167           be rejected.
168
169       -U [d|i|l|e|x|h]
170       --unicode=[default|invalid|locale|escape|hex|highlight]
171           Controls the display of non-ASCII characters in identifier names.
172           The default (--unicode=locale or --unicode=default) is to treat
173           them as multibyte characters and display them in the current
174           locale.  All other versions of this option treat the bytes as UTF-8
175           encoded values and attempt to interpret them.  If they cannot be
176           interpreted or if the --unicode=invalid option is used then they
177           are displayed as a sequence of hex bytes, encloses in curly
178           parethesis characters.
179
180           Using the --unicode=escape option will display the characters as as
181           unicode escape sequences (\uxxxx).  Using the --unicode=hex will
182           display the characters as hex byte sequences enclosed between angle
183           brackets.
184
185           Using the --unicode=highlight will display the characters as
186           unicode escape sequences but it will also highlighted them in red,
187           assuming that colouring is supported by the output device.  The
188           colouring is intended to draw attention to the presence of unicode
189           sequences when they might not be expected.
190
191       -e
192       --headers
193           Display all the headers in the file.  Equivalent to -h -l -S.
194
195       -n
196       --notes
197           Displays the contents of the NOTE segments and/or sections, if any.
198
199       -r
200       --relocs
201           Displays the contents of the file's relocation section, if it has
202           one.
203
204       -u
205       --unwind
206           Displays the contents of the file's unwind section, if it has one.
207           Only the unwind sections for IA64 ELF files, as well as ARM unwind
208           tables (".ARM.exidx" / ".ARM.extab") are currently supported.  If
209           support is not yet implemented for your architecture you could try
210           dumping the contents of the .eh_frames section using the
211           --debug-dump=frames or --debug-dump=frames-interp options.
212
213       -d
214       --dynamic
215           Displays the contents of the file's dynamic section, if it has one.
216
217       -V
218       --version-info
219           Displays the contents of the version sections in the file, it they
220           exist.
221
222       -A
223       --arch-specific
224           Displays architecture-specific information in the file, if there is
225           any.
226
227       -D
228       --use-dynamic
229           When displaying symbols, this option makes readelf use the symbol
230           hash tables in the file's dynamic section, rather than the symbol
231           table sections.
232
233           When displaying relocations, this option makes readelf display the
234           dynamic relocations rather than the static relocations.
235
236       -L
237       --lint
238       --enable-checks
239           Displays warning messages about possible problems with the file(s)
240           being examined.  If used on its own then all of the contents of the
241           file(s) will be examined.  If used with one of the dumping options
242           then the warning messages will only be produced for the things
243           being displayed.
244
245       -x <number or name>
246       --hex-dump=<number or name>
247           Displays the contents of the indicated section as a hexadecimal
248           bytes.  A number identifies a particular section by index in the
249           section table; any other string identifies all sections with that
250           name in the object file.
251
252       -R <number or name>
253       --relocated-dump=<number or name>
254           Displays the contents of the indicated section as a hexadecimal
255           bytes.  A number identifies a particular section by index in the
256           section table; any other string identifies all sections with that
257           name in the object file.  The contents of the section will be
258           relocated before they are displayed.
259
260       -p <number or name>
261       --string-dump=<number or name>
262           Displays the contents of the indicated section as printable
263           strings.  A number identifies a particular section by index in the
264           section table; any other string identifies all sections with that
265           name in the object file.
266
267       -z
268       --decompress
269           Requests that the section(s) being dumped by x, R or p options are
270           decompressed before being displayed.  If the section(s) are not
271           compressed then they are displayed as is.
272
273       -c
274       --archive-index
275           Displays the file symbol index information contained in the header
276           part of binary archives.  Performs the same function as the t
277           command to ar, but without using the BFD library.
278
279       -w[lLiaprmfFsOoRtUuTgAckK]
280       --debug-dump[=rawline,=decodedline,=info,=abbrev,=pubnames,=aranges,=macro,=frames,=frames-interp,=str,=str-offsets,=loc,=Ranges,=pubtypes,=trace_info,=trace_abbrev,=trace_aranges,=gdb_index,=addr,=cu_index,=links,=follow-links]
281           Displays the contents of the DWARF debug sections in the file, if
282           any are present.  Compressed debug sections are automatically
283           decompressed (temporarily) before they are displayed.  If one or
284           more of the optional letters or words follows the switch then only
285           those type(s) of data will be dumped.  The letters and words refer
286           to the following information:
287
288           "a"
289           "=abbrev"
290               Displays the contents of the .debug_abbrev section.
291
292           "A"
293           "=addr"
294               Displays the contents of the .debug_addr section.
295
296           "c"
297           "=cu_index"
298               Displays the contents of the .debug_cu_index and/or
299               .debug_tu_index sections.
300
301           "f"
302           "=frames"
303               Display the raw contents of a .debug_frame section.
304
305           "F"
306           "=frame-interp"
307               Display the interpreted contents of a .debug_frame section.
308
309           "g"
310           "=gdb_index"
311               Displays the contents of the .gdb_index and/or .debug_names
312               sections.
313
314           "i"
315           "=info"
316               Displays the contents of the .debug_info section.  Note: the
317               output from this option can also be restricted by the use of
318               the --dwarf-depth and --dwarf-start options.
319
320           "k"
321           "=links"
322               Displays the contents of the .gnu_debuglink, .gnu_debugaltlink
323               and .debug_sup sections, if any of them are present.  Also
324               displays any links to separate dwarf object files (dwo), if
325               they are specified by the DW_AT_GNU_dwo_name or DW_AT_dwo_name
326               attributes in the .debug_info section.
327
328           "K"
329           "=follow-links"
330               Display the contents of any selected debug sections that are
331               found in linked, separate debug info file(s).  This can result
332               in multiple versions of the same debug section being displayed
333               if it exists in more than one file.
334
335               In addition, when displaying DWARF attributes, if a form is
336               found that references the separate debug info file, then the
337               referenced contents will also be displayed.
338
339               Note - in some distributions this option is enabled by default.
340               It can be disabled via the N debug option.  The default can be
341               chosen when configuring the binutils via the
342               --enable-follow-debug-links=yes or
343               --enable-follow-debug-links=no options.  If these are not used
344               then the default is to enable the following of debug links.
345
346               Note - if support for the debuginfod protocol was enabled when
347               the binutils were built then this option will also include an
348               attempt to contact any debuginfod servers mentioned in the
349               DEBUGINFOD_URLS environment variable.  This could take some
350               time to resolve.  This behaviour can be disabled via the
351               =do-not-use-debuginfod debug option.
352
353           "N"
354           "=no-follow-links"
355               Disables the following of links to separate debug info files.
356
357           "D"
358           "=use-debuginfod"
359               Enables contacting debuginfod servers if there is a need to
360               follow debug links.  This is the default behaviour.
361
362           "E"
363           "=do-not-use-debuginfod"
364               Disables contacting debuginfod servers when there is a need to
365               follow debug links.
366
367           "l"
368           "=rawline"
369               Displays the contents of the .debug_line section in a raw
370               format.
371
372           "L"
373           "=decodedline"
374               Displays the interpreted contents of the .debug_line section.
375
376           "m"
377           "=macro"
378               Displays the contents of the .debug_macro and/or .debug_macinfo
379               sections.
380
381           "o"
382           "=loc"
383               Displays the contents of the .debug_loc and/or .debug_loclists
384               sections.
385
386           "O"
387           "=str-offsets"
388               Displays the contents of the .debug_str_offsets section.
389
390           "p"
391           "=pubnames"
392               Displays the contents of the .debug_pubnames and/or
393               .debug_gnu_pubnames sections.
394
395           "r"
396           "=aranges"
397               Displays the contents of the .debug_aranges section.
398
399           "R"
400           "=Ranges"
401               Displays the contents of the .debug_ranges and/or
402               .debug_rnglists sections.
403
404           "s"
405           "=str"
406               Displays the contents of the .debug_str, .debug_line_str and/or
407               .debug_str_offsets sections.
408
409           "t"
410           "=pubtype"
411               Displays the contents of the .debug_pubtypes and/or
412               .debug_gnu_pubtypes sections.
413
414           "T"
415           "=trace_aranges"
416               Displays the contents of the .trace_aranges section.
417
418           "u"
419           "=trace_abbrev"
420               Displays the contents of the .trace_abbrev section.
421
422           "U"
423           "=trace_info"
424               Displays the contents of the .trace_info section.
425
426           Note: displaying the contents of .debug_static_funcs,
427           .debug_static_vars and debug_weaknames sections is not currently
428           supported.
429
430       --dwarf-depth=n
431           Limit the dump of the ".debug_info" section to n children.  This is
432           only useful with --debug-dump=info.  The default is to print all
433           DIEs; the special value 0 for n will also have this effect.
434
435           With a non-zero value for n, DIEs at or deeper than n levels will
436           not be printed.  The range for n is zero-based.
437
438       --dwarf-start=n
439           Print only DIEs beginning with the DIE numbered n.  This is only
440           useful with --debug-dump=info.
441
442           If specified, this option will suppress printing of any header
443           information and all DIEs before the DIE numbered n.  Only siblings
444           and children of the specified DIE will be printed.
445
446           This can be used in conjunction with --dwarf-depth.
447
448       -P
449       --process-links
450           Display the contents of non-debug sections found in separate
451           debuginfo files that are linked to the main file.  This option
452           automatically implies the -wK option, and only sections requested
453           by other command line options will be displayed.
454
455       --ctf=section
456           Display the contents of the specified CTF section.  CTF sections
457           themselves contain many subsections, all of which are displayed in
458           order.
459
460       --ctf-parent=section
461           Specify the name of another section from which the CTF dictionary
462           can inherit types.  (If none is specified, we assume the CTF
463           dictionary inherits types from the default-named member of the
464           archive contained within this section.)
465
466       --ctf-symbols=section
467       --ctf-strings=section
468           Specify the name of another section from which the CTF file can
469           inherit strings and symbols.  By default, the ".symtab" and its
470           linked string table are used.
471
472           If either of --ctf-symbols or --ctf-strings is specified, the other
473           must be specified as well.
474
475       -I
476       --histogram
477           Display a histogram of bucket list lengths when displaying the
478           contents of the symbol tables.
479
480       -v
481       --version
482           Display the version number of readelf.
483
484       -W
485       --wide
486           Don't break output lines to fit into 80 columns. By default readelf
487           breaks section header and segment listing lines for 64-bit ELF
488           files, so that they fit into 80 columns. This option causes readelf
489           to print each section header resp. each segment one a single line,
490           which is far more readable on terminals wider than 80 columns.
491
492       -T
493       --silent-truncation
494           Normally when readelf is displaying a symbol name, and it has to
495           truncate the name to fit into an 80 column display, it will add a
496           suffix of "[...]" to the name.  This command line option disables
497           this behaviour, allowing 5 more characters of the name to be
498           displayed and restoring the old behaviour of readelf (prior to
499           release 2.35).
500
501       -H
502       --help
503           Display the command-line options understood by readelf.
504
505       @file
506           Read command-line options from file.  The options read are inserted
507           in place of the original @file option.  If file does not exist, or
508           cannot be read, then the option will be treated literally, and not
509           removed.
510
511           Options in file are separated by whitespace.  A whitespace
512           character may be included in an option by surrounding the entire
513           option in either single or double quotes.  Any character (including
514           a backslash) may be included by prefixing the character to be
515           included with a backslash.  The file may itself contain additional
516           @file options; any such options will be processed recursively.
517

SEE ALSO

519       objdump(1), and the Info entries for binutils.
520
522       Copyright (c) 1991-2021 Free Software Foundation, Inc.
523
524       Permission is granted to copy, distribute and/or modify this document
525       under the terms of the GNU Free Documentation License, Version 1.3 or
526       any later version published by the Free Software Foundation; with no
527       Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
528       Texts.  A copy of the license is included in the section entitled "GNU
529       Free Documentation License".
530
531
532
533binutils-2.37                     2022-03-10                        READELF(1)
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