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READELF(1) GNU Development Tools READELF(1)
NAME
readelf - Displays information about ELF files.
SYNOPSIS
readelf [-a|--all]
[-h|--file-header]
[-l|--program-headers|--segments]
[-S|--section-headers|--sections]
[-g|--section-groups]
[-t|--section-details]
[-e|--headers]
[-s|--syms|--symbols]
[--dyn-syms]
[-n|--notes]
[-r|--relocs]
[-u|--unwind]
[-d|--dynamic]
[-V|--version-info]
[-A|--arch-specific]
[-D|--use-dynamic]
[-x <number or name>|--hex-dump=<number or name>]
[-p <number or name>|--string-dump=<number or name>]
[-R <number or name>|--relocated-dump=<number or name>]
[-z|--decompress]
[-c|--archive-index]
[-w[lLiaprmfFsoRt]|
--debug-dump[=rawline,=decodedline,=info,=abbrev,=pubnames,=aranges,=macro,=frames,=frames-interp,=str,=loc,=Ranges,=pubtypes,=trace_info,=trace_abbrev,=trace_aranges,=gdb_index]]
[--dwarf-depth=n]
[--dwarf-start=n]
[-I|--histogram]
[-v|--version]
[-W|--wide]
[-H|--help]
[-U method|--unicode=method]
elffile...
DESCRIPTION
readelf displays information about one or more ELF format object files. The options
control what particular information to display.
elffile... are the object files to be examined. 32-bit and 64-bit ELF files are
supported, as are archives containing ELF files.
This program performs a similar function to objdump but it goes into more detail and it
exists independently of the BFD library, so if there is a bug in BFD then readelf will not
be affected.
OPTIONS
The long and short forms of options, shown here as alternatives, are equivalent. At least
one option besides -v or -H must be given.
-a
--all
Equivalent to specifying --file-header, --program-headers, --sections, --symbols,
--relocs, --dynamic, --notes and --version-info.
-h
--file-header
Displays the information contained in the ELF header at the start of the file.
-l
--program-headers
--segments
Displays the information contained in the file's segment headers, if it has any.
-S
--sections
--section-headers
Displays the information contained in the file's section headers, if it has any.
-g
--section-groups
Displays the information contained in the file's section groups, if it has any.
-t
--section-details
Displays the detailed section information. Implies -S.
-s
--symbols
--syms
Displays the entries in symbol table section of the file, if it has one.
--dyn-syms
Displays the entries in dynamic symbol table section of the file, if it has one.
-U [d|i|l|e|x|h]
--unicode=[default|invalid|locale|escape|hex|highlight]
Controls the display of non-ASCII characters in identifier names. The default
(--unicode=locale or --unicode=default) is to treat them as multibyte characters and
display them in the current locale. All other versions of this option treat the bytes
as UTF-8 encoded values and attempt to interpret them. If they cannot be interpreted
or if the --unicode=invalid option is used then they are displayed as a sequence of
hex bytes, encloses in curly parethesis characters.
Using the --unicode=escape option will display the characters as as unicode escape
sequences (\uxxxx). Using the --unicode=hex will display the characters as hex byte
sequences enclosed between angle brackets.
Using the --unicode=highlight will display the characters as unicode escape sequences
but it will also highlighted them in red, assuming that colouring is supported by the
output device. The colouring is intended to draw attention to the presence of unicode
sequences when they might not be expected.
-e
--headers
Display all the headers in the file. Equivalent to -h -l -S.
-n
--notes
Displays the contents of the NOTE segments and/or sections, if any.
-r
--relocs
Displays the contents of the file's relocation section, if it has one.
-u
--unwind
Displays the contents of the file's unwind section, if it has one. Only the unwind
sections for IA64 ELF files, as well as ARM unwind tables (".ARM.exidx" /
".ARM.extab") are currently supported.
-d
--dynamic
Displays the contents of the file's dynamic section, if it has one.
-V
--version-info
Displays the contents of the version sections in the file, it they exist.
-A
--arch-specific
Displays architecture-specific information in the file, if there is any.
-D
--use-dynamic
When displaying symbols, this option makes readelf use the symbol hash tables in the
file's dynamic section, rather than the symbol table sections.
-x <number or name>
--hex-dump=<number or name>
Displays the contents of the indicated section as a hexadecimal bytes. A number
identifies a particular section by index in the section table; any other string
identifies all sections with that name in the object file.
-R <number or name>
--relocated-dump=<number or name>
Displays the contents of the indicated section as a hexadecimal bytes. A number
identifies a particular section by index in the section table; any other string
identifies all sections with that name in the object file. The contents of the
section will be relocated before they are displayed.
-p <number or name>
--string-dump=<number or name>
Displays the contents of the indicated section as printable strings. A number
identifies a particular section by index in the section table; any other string
identifies all sections with that name in the object file.
-z
--decompress
Requests that the section(s) being dumped by x, R or p options are decompressed before
being displayed. If the section(s) are not compressed then they are displayed as is.
-c
--archive-index
Displays the file symbol index information contained in the header part of binary
archives. Performs the same function as the t command to ar, but without using the
BFD library.
-w[lLiaprmfFsoRt]
--debug-dump[=rawline,=decodedline,=info,=abbrev,=pubnames,=aranges,=macro,=frames,=frames-interp,=str,=loc,=Ranges,=pubtypes,=trace_info,=trace_abbrev,=trace_aranges,=gdb_index]
Displays the contents of the debug sections in the file, if any are present. If one
of the optional letters or words follows the switch then only data found in those
specific sections will be dumped.
Note that there is no single letter option to display the content of trace sections or
.gdb_index.
Note: the =decodedline option will display the interpreted contents of a .debug_line
section whereas the =rawline option dumps the contents in a raw format.
Note: the =frames-interp option will display the interpreted contents of a
.debug_frame section whereas the =frames option dumps the contents in a raw format.
Note: the output from the =info option can also be affected by the options
--dwarf-depth and --dwarf-start.
--dwarf-depth=n
Limit the dump of the ".debug_info" section to n children. This is only useful with
--debug-dump=info. The default is to print all DIEs; the special value 0 for n will
also have this effect.
With a non-zero value for n, DIEs at or deeper than n levels will not be printed. The
range for n is zero-based.
--dwarf-start=n
Print only DIEs beginning with the DIE numbered n. This is only useful with
--debug-dump=info.
If specified, this option will suppress printing of any header information and all
DIEs before the DIE numbered n. Only siblings and children of the specified DIE will
be printed.
This can be used in conjunction with --dwarf-depth.
-I
--histogram
Display a histogram of bucket list lengths when displaying the contents of the symbol
tables.
-v
--version
Display the version number of readelf.
-W
--wide
Don't break output lines to fit into 80 columns. By default readelf breaks section
header and segment listing lines for 64-bit ELF files, so that they fit into 80
columns. This option causes readelf to print each section header resp. each segment
one a single line, which is far more readable on terminals wider than 80 columns.
-H
--help
Display the command line options understood by readelf.
@file
Read command-line options from file. The options read are inserted in place of the
original @file option. If file does not exist, or cannot be read, then the option
will be treated literally, and not removed.
Options in file are separated by whitespace. A whitespace character may be included
in an option by surrounding the entire option in either single or double quotes. Any
character (including a backslash) may be included by prefixing the character to be
included with a backslash. The file may itself contain additional @file options; any
such options will be processed recursively.
SEE ALSO
objdump(1), and the Info entries for binutils.
COPYRIGHT
Copyright (c) 1991-2016 Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document under the terms of
the GNU Free Documentation License, Version 1.3 or any later version published by the Free
Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no
Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free
Documentation License".
binutils-2.27 2021-11-01 READELF(1)
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On Apache/2.4.6 (CentOS)
Under GNU General Public License
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