1READELF(1) GNU Development Tools READELF(1)
2
6 readelf - display information about ELF files
7
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]
18 [-n|--notes]
19 [-r|--relocs]
20 [-u|--unwind]
21 [-d|--dynamic]
22 [-V|--version-info]
23 [-A|--arch-specific]
24 [-D|--use-dynamic]
25 [-L|--lint|--enable-checks]
26 [-x <number or name>|--hex-dump=<number or name>]
27 [-p <number or name>|--string-dump=<number or name>]
28 [-R <number or name>|--relocated-dump=<number or name>]
29 [-z|--decompress]
30 [-c|--archive-index]
31 [-w[lLiaprmfFsoORtUuTgAckK]|
32 --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]]
33 [--dwarf-depth=n]
34 [--dwarf-start=n]
35 [--ctf=section]
36 [--ctf-parent=section]
37 [--ctf-symbols=section]
38 [--ctf-strings=section]
39 [-I|--histogram]
40 [-v|--version]
41 [-W|--wide]
42 [-T|--silent-truncation]
43 [-H|--help]
44 elffile...
45
47 readelf displays information about one or more ELF format object files.
48 The options control what particular information to display.
49 elffile... are the object files to be examined. 32-bit and 64-bit ELF
51 files are supported, as are archives containing ELF files.
52 This program performs a similar function to objdump but it goes into
54 more detail and it exists independently of the BFD library, so if there
55 is a bug in BFD then readelf will not be affected.
56
58 The long and short forms of options, shown here as alternatives, are
59 equivalent. At least one option besides -v or -H must be given.
60 -a
62 --all
63 Equivalent to specifying --file-header, --program-headers,
64 --sections, --symbols, --relocs, --dynamic, --notes,
65 --version-info, --arch-specific, --unwind, --section-groups and
66 --histogram.
67 Note - this option does not enable --use-dynamic itself, so if that
69 option is not present on the command line then dynamic symbols and
70 dynamic relocs will not be displayed.
71 -h
73 --file-header
74 Displays the information contained in the ELF header at the start
75 of the file.
76 -l
78 --program-headers
79 --segments
80 Displays the information contained in the file's segment headers,
81 if it has any.
82 -S
84 --sections
85 --section-headers
86 Displays the information contained in the file's section headers,
87 if it has any.
88 -g
90 --section-groups
91 Displays the information contained in the file's section groups, if
92 it has any.
93 -t
95 --section-details
96 Displays the detailed section information. Implies -S.
97 -s
99 --symbols
100 --syms
101 Displays the entries in symbol table section of the file, if it has
102 one. If a symbol has version information associated with it then
103 this is displayed as well. The version string is displayed as a
104 suffix to the symbol name, preceeded by an @ character. For
105 example foo@VER_1. If the version is the default version to be
106 used when resolving unversioned references to the symbol then it is
107 displayed as a suffix preceeded by two @ characters. For example
108 foo@@VER_2.
109 --dyn-syms
111 Displays the entries in dynamic symbol table section of the file,
112 if it has one. The output format is the same as the format used by
113 the --syms option.
114 -e
116 --headers
117 Display all the headers in the file. Equivalent to -h -l -S.
118 -n
120 --notes
121 Displays the contents of the NOTE segments and/or sections, if any.
122 -r
124 --relocs
125 Displays the contents of the file's relocation section, if it has
126 one.
127 -u
129 --unwind
130 Displays the contents of the file's unwind section, if it has one.
131 Only the unwind sections for IA64 ELF files, as well as ARM unwind
132 tables (".ARM.exidx" / ".ARM.extab") are currently supported. If
133 support is not yet implemented for your architecture you could try
134 dumping the contents of the .eh_frames section using the
135 --debug-dump=frames or --debug-dump=frames-interp options.
136 -d
138 --dynamic
139 Displays the contents of the file's dynamic section, if it has one.
140 -V
142 --version-info
143 Displays the contents of the version sections in the file, it they
144 exist.
145 -A
147 --arch-specific
148 Displays architecture-specific information in the file, if there is
149 any.
150 -D
152 --use-dynamic
153 When displaying symbols, this option makes readelf use the symbol
154 hash tables in the file's dynamic section, rather than the symbol
155 table sections.
156 When displaying relocations, this option makes readelf display the
158 dynamic relocations rather than the static relocations.
159 -L
161 --lint
162 --enable-checks
163 Displays warning messages about possible problems with the file(s)
164 being examined. If used on its own then all of the contents of the
165 file(s) will be examined. If used with one of the dumping options
166 then the warning messages will only be produced for the things
167 being displayed.
168 -x <number or name>
170 --hex-dump=<number or name>
171 Displays the contents of the indicated section as a hexadecimal
172 bytes. A number identifies a particular section by index in the
173 section table; any other string identifies all sections with that
174 name in the object file.
175 -R <number or name>
177 --relocated-dump=<number or name>
178 Displays the contents of the indicated section as a hexadecimal
179 bytes. A number identifies a particular section by index in the
180 section table; any other string identifies all sections with that
181 name in the object file. The contents of the section will be
182 relocated before they are displayed.
183 -p <number or name>
185 --string-dump=<number or name>
186 Displays the contents of the indicated section as printable
187 strings. A number identifies a particular section by index in the
188 section table; any other string identifies all sections with that
189 name in the object file.
190 -z
192 --decompress
193 Requests that the section(s) being dumped by x, R or p options are
194 decompressed before being displayed. If the section(s) are not
195 compressed then they are displayed as is.
196 -c
198 --archive-index
199 Displays the file symbol index information contained in the header
200 part of binary archives. Performs the same function as the t
201 command to ar, but without using the BFD library.
202 -w[lLiaprmfFsOoRtUuTgAckK]
204 --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]
205 Displays the contents of the DWARF debug sections in the file, if
206 any are present. Compressed debug sections are automatically
207 decompressed (temporarily) before they are displayed. If one or
208 more of the optional letters or words follows the switch then only
209 those type(s) of data will be dumped. The letters and words refer
210 to the following information:
211 "a"
213 "=abbrev"
214 Displays the contents of the .debug_abbrev section.
215 "A"
217 "=addr"
218 Displays the contents of the .debug_addr section.
219 "c"
221 "=cu_index"
222 Displays the contents of the .debug_cu_index and/or
223 .debug_tu_index sections.
224 "f"
226 "=frames"
227 Display the raw contents of a .debug_frame section.
228 "F"
230 "=frame-interp"
231 Display the interpreted contents of a .debug_frame section.
232 "g"
234 "=gdb_index"
235 Displays the contents of the .gdb_index and/or .debug_names
236 sections.
237 "i"
239 "=info"
240 Displays the contents of the .debug_info section. Note: the
241 output from this option can also be restricted by the use of
242 the --dwarf-depth and --dwarf-start options.
243 "k"
245 "=links"
246 Displays the contents of the .gnu_debuglink and/or
247 .gnu_debugaltlink sections. Also displays any links to
248 separate dwarf object files (dwo), if they are specified by the
249 DW_AT_GNU_dwo_name or DW_AT_dwo_name attributes in the
250 .debug_info section.
251 "K"
253 "=follow-links"
254 Display the contents of any selected debug sections that are
255 found in linked, separate debug info file(s). This can result
256 in multiple versions of the same debug section being displayed
257 if it exists in more than one file.
258 In addition, when displaying DWARF attributes, if a form is
260 found that references the separate debug info file, then the
261 referenced contents will also be displayed.
262 "l"
264 "=rawline"
265 Displays the contents of the .debug_line section in a raw
266 format.
267 "L"
269 "=decodedline"
270 Displays the interpreted contents of the .debug_line section.
271 "m"
273 "=macro"
274 Displays the contents of the .debug_macro and/or .debug_macinfo
275 sections.
276 "o"
278 "=loc"
279 Displays the contents of the .debug_loc and/or .debug_loclists
280 sections.
281 "O"
283 "=str-offsets"
284 Displays the contents of the .debug_str_offsets section.
285 "p"
287 "=pubnames"
288 Displays the contents of the .debug_pubnames and/or
289 .debug_gnu_pubnames sections.
290 "r"
292 "=aranges"
293 Displays the contents of the .debug_aranges section.
294 "R"
296 "=Ranges"
297 Displays the contents of the .debug_ranges and/or
298 .debug_rnglists sections.
299 "s"
301 "=str"
302 Displays the contents of the .debug_str, .debug_line_str and/or
303 .debug_str_offsets sections.
304 "t"
306 "=pubtype"
307 Displays the contents of the .debug_pubtypes and/or
308 .debug_gnu_pubtypes sections.
309 "T"
311 "=trace_aranges"
312 Displays the contents of the .trace_aranges section.
313 "u"
315 "=trace_abbrev"
316 Displays the contents of the .trace_abbrev section.
317 "U"
319 "=trace_info"
320 Displays the contents of the .trace_info section.
321 Note: displaying the contents of .debug_static_funcs,
323 .debug_static_vars and debug_weaknames sections is not currently
324 supported.
325 --dwarf-depth=n
327 Limit the dump of the ".debug_info" section to n children. This is
328 only useful with --debug-dump=info. The default is to print all
329 DIEs; the special value 0 for n will also have this effect.
330 With a non-zero value for n, DIEs at or deeper than n levels will
332 not be printed. The range for n is zero-based.
333 --dwarf-start=n
335 Print only DIEs beginning with the DIE numbered n. This is only
336 useful with --debug-dump=info.
337 If specified, this option will suppress printing of any header
339 information and all DIEs before the DIE numbered n. Only siblings
340 and children of the specified DIE will be printed.
341 This can be used in conjunction with --dwarf-depth.
343 --ctf=section
345 Display the contents of the specified CTF section. CTF sections
346 themselves contain many subsections, all of which are displayed in
347 order.
348 --ctf-parent=section
350 Specify the name of another section from which the CTF dictionary
351 can inherit types. (If none is specified, we assume the CTF
352 dictionary inherits types from the default-named member of the
353 archive contained within this section.)
354 --ctf-symbols=section
356 --ctf-strings=section
357 Specify the name of another section from which the CTF file can
358 inherit strings and symbols. By default, the ".symtab" and its
359 linked string table are used.
360 If either of --ctf-symbols or --ctf-strings is specified, the other
362 must be specified as well.
363 -I
365 --histogram
366 Display a histogram of bucket list lengths when displaying the
367 contents of the symbol tables.
368 -v
370 --version
371 Display the version number of readelf.
372 -W
374 --wide
375 Don't break output lines to fit into 80 columns. By default readelf
376 breaks section header and segment listing lines for 64-bit ELF
377 files, so that they fit into 80 columns. This option causes readelf
378 to print each section header resp. each segment one a single line,
379 which is far more readable on terminals wider than 80 columns.
380 -T
382 --silent-truncation
383 Normally when readelf is displaying a symbol name, and it has to
384 truncate the name to fit into an 80 column display, it will add a
385 suffix of "[...]" to the name. This command line option disables
386 this behaviour, allowing 5 more characters of the name to be
387 displayed and restoring the old behaviour of readelf (prior to
388 release 2.35).
389 -H
391 --help
392 Display the command-line options understood by readelf.
393 @file
395 Read command-line options from file. The options read are inserted
396 in place of the original @file option. If file does not exist, or
397 cannot be read, then the option will be treated literally, and not
398 removed.
399 Options in file are separated by whitespace. A whitespace
401 character may be included in an option by surrounding the entire
402 option in either single or double quotes. Any character (including
403 a backslash) may be included by prefixing the character to be
404 included with a backslash. The file may itself contain additional
405 @file options; any such options will be processed recursively.
406
408 objdump(1), and the Info entries for binutils.
409
411 Copyright (c) 1991-2020 Free Software Foundation, Inc.
412 Permission is granted to copy, distribute and/or modify this document
414 under the terms of the GNU Free Documentation License, Version 1.3 or
415 any later version published by the Free Software Foundation; with no
416 Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
417 Texts. A copy of the license is included in the section entitled "GNU
418 Free Documentation License".
419binutils-2.35 2020-07-24 READELF(1)