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 [-x <number or name>|--hex-dump=<number or name>]
26 [-p <number or name>|--string-dump=<number or name>]
27 [-R <number or name>|--relocated-dump=<number or name>]
28 [-z|--decompress]
29 [-c|--archive-index]
30 [-w[lLiaprmfFsoRtUuTgAckK]|
31 --debug-dump[=rawline,=decodedline,=info,=abbrev,=pubnames,=aranges,=macro,=frames,=frames-interp,=str,=loc,=Ranges,=pubtypes,=trace_info,=trace_abbrev,=trace_aranges,=gdb_index,=addr,=cu_index,=links,=follow-links]]
32 [--dwarf-depth=n]
33 [--dwarf-start=n]
34 [--ctf=section]
35 [--ctf-parent=section]
36 [--ctf-symbols=section]
37 [--ctf-strings=section]
38 [-I|--histogram]
39 [-v|--version]
40 [-W|--wide]
41 [-H|--help]
42 elffile...
43
45 readelf displays information about one or more ELF format object files.
46 The options control what particular information to display.
47 elffile... are the object files to be examined. 32-bit and 64-bit ELF
49 files are supported, as are archives containing ELF files.
50 This program performs a similar function to objdump but it goes into
52 more detail and it exists independently of the BFD library, so if there
53 is a bug in BFD then readelf will not be affected.
54
56 The long and short forms of options, shown here as alternatives, are
57 equivalent. At least one option besides -v or -H must be given.
58 -a
60 --all
61 Equivalent to specifying --file-header, --program-headers,
62 --sections, --symbols, --relocs, --dynamic, --notes,
63 --version-info, --arch-specific, --unwind, --section-groups and
64 --histogram.
65 Note - this option does not enable --use-dynamic itself, so if that
67 option is not present on the command line then dynamic symbols and
68 dynamic relocs will not be displayed.
69 -h
71 --file-header
72 Displays the information contained in the ELF header at the start
73 of the file.
74 -l
76 --program-headers
77 --segments
78 Displays the information contained in the file's segment headers,
79 if it has any.
80 -S
82 --sections
83 --section-headers
84 Displays the information contained in the file's section headers,
85 if it has any.
86 -g
88 --section-groups
89 Displays the information contained in the file's section groups, if
90 it has any.
91 -t
93 --section-details
94 Displays the detailed section information. Implies -S.
95 -s
97 --symbols
98 --syms
99 Displays the entries in symbol table section of the file, if it has
100 one. If a symbol has version information associated with it then
101 this is displayed as well. The version string is displayed as a
102 suffix to the symbol name, preceeded by an @ character. For
103 example foo@VER_1. If the version is the default version to be
104 used when resolving unversioned references to the symbol then it is
105 displayed as a suffix preceeded by two @ characters. For example
106 foo@@VER_2.
107 --dyn-syms
109 Displays the entries in dynamic symbol table section of the file,
110 if it has one. The output format is the same as the format used by
111 the --syms option.
112 -e
114 --headers
115 Display all the headers in the file. Equivalent to -h -l -S.
116 -n
118 --notes
119 Displays the contents of the NOTE segments and/or sections, if any.
120 -r
122 --relocs
123 Displays the contents of the file's relocation section, if it has
124 one.
125 -u
127 --unwind
128 Displays the contents of the file's unwind section, if it has one.
129 Only the unwind sections for IA64 ELF files, as well as ARM unwind
130 tables (".ARM.exidx" / ".ARM.extab") are currently supported. If
131 support is not yet implemented for your architecture you could try
132 dumping the contents of the .eh_frames section using the
133 --debug-dump=frames or --debug-dump=frames-interp options.
134 -d
136 --dynamic
137 Displays the contents of the file's dynamic section, if it has one.
138 -V
140 --version-info
141 Displays the contents of the version sections in the file, it they
142 exist.
143 -A
145 --arch-specific
146 Displays architecture-specific information in the file, if there is
147 any.
148 -D
150 --use-dynamic
151 When displaying symbols, this option makes readelf use the symbol
152 hash tables in the file's dynamic section, rather than the symbol
153 table sections.
154 When displaying relocations, this option makes readelf display the
156 dynamic relocations rather than the static relocations.
157 -x <number or name>
159 --hex-dump=<number or name>
160 Displays the contents of the indicated section as a hexadecimal
161 bytes. A number identifies a particular section by index in the
162 section table; any other string identifies all sections with that
163 name in the object file.
164 -R <number or name>
166 --relocated-dump=<number or name>
167 Displays the contents of the indicated section as a hexadecimal
168 bytes. A number identifies a particular section by index in the
169 section table; any other string identifies all sections with that
170 name in the object file. The contents of the section will be
171 relocated before they are displayed.
172 -p <number or name>
174 --string-dump=<number or name>
175 Displays the contents of the indicated section as printable
176 strings. A number identifies a particular section by index in the
177 section table; any other string identifies all sections with that
178 name in the object file.
179 -z
181 --decompress
182 Requests that the section(s) being dumped by x, R or p options are
183 decompressed before being displayed. If the section(s) are not
184 compressed then they are displayed as is.
185 -c
187 --archive-index
188 Displays the file symbol index information contained in the header
189 part of binary archives. Performs the same function as the t
190 command to ar, but without using the BFD library.
191 -w[lLiaprmfFsoRtUuTgAckK]
193 --debug-dump[=rawline,=decodedline,=info,=abbrev,=pubnames,=aranges,=macro,=frames,=frames-interp,=str,=loc,=Ranges,=pubtypes,=trace_info,=trace_abbrev,=trace_aranges,=gdb_index,=addr,=cu_index,=links,=follow-links]
194 Displays the contents of the DWARF debug sections in the file, if
195 any are present. Compressed debug sections are automatically
196 decompressed (temporarily) before they are displayed. If one or
197 more of the optional letters or words follows the switch then only
198 those type(s) of data will be dumped. The letters and words refer
199 to the following information:
200 "a"
202 "=abbrev"
203 Displays the contents of the .debug_abbrev section.
204 "A"
206 "=addr"
207 Displays the contents of the .debug_addr section.
208 "c"
210 "=cu_index"
211 Displays the contents of the .debug_cu_index and/or
212 .debug_tu_index sections.
213 "f"
215 "=frames"
216 Display the raw contents of a .debug_frame section.
217 "F"
219 "=frame-interp"
220 Display the interpreted contents of a .debug_frame section.
221 "g"
223 "=gdb_index"
224 Displays the contents of the .gdb_index and/or .debug_names
225 sections.
226 "i"
228 "=info"
229 Displays the contents of the .debug_info section. Note: the
230 output from this option can also be restricted by the use of
231 the --dwarf-depth and --dwarf-start options.
232 "k"
234 "=links"
235 Displays the contents of the .gnu_debuglink and/or
236 .gnu_debugaltlink sections. Also displays any links to
237 separate dwarf object files (dwo), if they are specified by the
238 DW_AT_GNU_dwo_name or DW_AT_dwo_name attributes in the
239 .debug_info section.
240 "K"
242 "=follow-links"
243 Display the contents of any selected debug sections that are
244 found in linked, separate debug info file(s). This can result
245 in multiple versions of the same debug section being displayed
246 if it exists in more than one file.
247 In addition, when displaying DWARF attributes, if a form is
249 found that references the separate debug info file, then the
250 referenced contents will also be displayed.
251 "l"
253 "=rawline"
254 Displays the contents of the .debug_line section in a raw
255 format.
256 "L"
258 "=decodedline"
259 Displays the interpreted contents of the .debug_line section.
260 "m"
262 "=macro"
263 Displays the contents of the .debug_macro and/or .debug_macinfo
264 sections.
265 "o"
267 "=loc"
268 Displays the contents of the .debug_loc and/or .debug_loclists
269 sections.
270 "p"
272 "=pubnames"
273 Displays the contents of the .debug_pubnames and/or
274 .debug_gnu_pubnames sections.
275 "r"
277 "=aranges"
278 Displays the contents of the .debug_aranges section.
279 "R"
281 "=Ranges"
282 Displays the contents of the .debug_ranges and/or
283 .debug_rnglists sections.
284 "s"
286 "=str"
287 Displays the contents of the .debug_str, .debug_line_str and/or
288 .debug_str_offsets sections.
289 "t"
291 "=pubtype"
292 Displays the contents of the .debug_pubtypes and/or
293 .debug_gnu_pubtypes sections.
294 "T"
296 "=trace_aranges"
297 Displays the contents of the .trace_aranges section.
298 "u"
300 "=trace_abbrev"
301 Displays the contents of the .trace_abbrev section.
302 "U"
304 "=trace_info"
305 Displays the contents of the .trace_info section.
306 Note: displaying the contents of .debug_static_funcs,
308 .debug_static_vars and debug_weaknames sections is not currently
309 supported.
310 --dwarf-depth=n
312 Limit the dump of the ".debug_info" section to n children. This is
313 only useful with --debug-dump=info. The default is to print all
314 DIEs; the special value 0 for n will also have this effect.
315 With a non-zero value for n, DIEs at or deeper than n levels will
317 not be printed. The range for n is zero-based.
318 --dwarf-start=n
320 Print only DIEs beginning with the DIE numbered n. This is only
321 useful with --debug-dump=info.
322 If specified, this option will suppress printing of any header
324 information and all DIEs before the DIE numbered n. Only siblings
325 and children of the specified DIE will be printed.
326 This can be used in conjunction with --dwarf-depth.
328 --ctf=section
330 Display the contents of the specified CTF section. CTF sections
331 themselves contain many subsections, all of which are displayed in
332 order.
333 --ctf-parent=section
335 Specify the name of another section from which the CTF dictionary
336 can inherit types. (If none is specified, we assume the CTF
337 dictionary inherits types from the default-named member of the
338 archive contained within this section.)
339 --ctf-symbols=section
341 --ctf-strings=section
342 Specify the name of another section from which the CTF file can
343 inherit strings and symbols. By default, the ".symtab" and its
344 linked string table are used.
345 If either of --ctf-symbols or --ctf-strings is specified, the other
347 must be specified as well.
348 -I
350 --histogram
351 Display a histogram of bucket list lengths when displaying the
352 contents of the symbol tables.
353 -v
355 --version
356 Display the version number of readelf.
357 -W
359 --wide
360 Don't break output lines to fit into 80 columns. By default readelf
361 breaks section header and segment listing lines for 64-bit ELF
362 files, so that they fit into 80 columns. This option causes readelf
363 to print each section header resp. each segment one a single line,
364 which is far more readable on terminals wider than 80 columns.
365 -H
367 --help
368 Display the command-line options understood by readelf.
369 @file
371 Read command-line options from file. The options read are inserted
372 in place of the original @file option. If file does not exist, or
373 cannot be read, then the option will be treated literally, and not
374 removed.
375 Options in file are separated by whitespace. A whitespace
377 character may be included in an option by surrounding the entire
378 option in either single or double quotes. Any character (including
379 a backslash) may be included by prefixing the character to be
380 included with a backslash. The file may itself contain additional
381 @file options; any such options will be processed recursively.
382
384 objdump(1), and the Info entries for binutils.
385
387 Copyright (c) 1991-2020 Free Software Foundation, Inc.
388 Permission is granted to copy, distribute and/or modify this document
390 under the terms of the GNU Free Documentation License, Version 1.3 or
391 any later version published by the Free Software Foundation; with no
392 Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
393 Texts. A copy of the license is included in the section entitled "GNU
394 Free Documentation License".
395binutils-2.34 2020-02-17 READELF(1)