READELF(1) GNU Development Tools READELF(1)
NAME
readelf - display 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]
[-L|--lint|--enable-checks]
[-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[lLiaprmfFsoORtUuTgAckK]|
--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]]
[--dwarf-depth=n]
[--dwarf-start=n]
[--ctf=section]
[--ctf-parent=section]
[--ctf-symbols=section]
[--ctf-strings=section]
[-I|--histogram]
[-v|--version]
[-W|--wide]
[-T|--silent-truncation]
[-H|--help]
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,
--version-info, --arch-specific, --unwind, --section-groups and
--histogram.
Note - this option does not enable --use-dynamic itself, so if that
option is not present on the command line then dynamic symbols and
dynamic relocs will not be displayed.
-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. If a symbol has version information associated with it then
this is displayed as well. The version string is displayed as a
suffix to the symbol name, preceeded by an @ character. For
example foo@VER_1. If the version is the default version to be
used when resolving unversioned references to the symbol then it is
displayed as a suffix preceeded by two @ characters. For example
foo@@VER_2.
--dyn-syms
Displays the entries in dynamic symbol table section of the file,
if it has one. The output format is the same as the format used by
the --syms option.
-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. If
support is not yet implemented for your architecture you could try
dumping the contents of the .eh_frames section using the
--debug-dump=frames or --debug-dump=frames-interp options.
-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.
When displaying relocations, this option makes readelf display the
dynamic relocations rather than the static relocations.
-L
--lint
--enable-checks
Displays warning messages about possible problems with the file(s)
being examined. If used on its own then all of the contents of the
file(s) will be examined. If used with one of the dumping options
then the warning messages will only be produced for the things
being displayed.
-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[lLiaprmfFsOoRtUuTgAckK]
--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]
Displays the contents of the DWARF debug sections in the file, if
any are present. Compressed debug sections are automatically
decompressed (temporarily) before they are displayed. If one or
more of the optional letters or words follows the switch then only
those type(s) of data will be dumped. The letters and words refer
to the following information:
"a"
"=abbrev"
Displays the contents of the .debug_abbrev section.
"A"
"=addr"
Displays the contents of the .debug_addr section.
"c"
"=cu_index"
Displays the contents of the .debug_cu_index and/or
.debug_tu_index sections.
"f"
"=frames"
Display the raw contents of a .debug_frame section.
"F"
"=frame-interp"
Display the interpreted contents of a .debug_frame section.
"g"
"=gdb_index"
Displays the contents of the .gdb_index and/or .debug_names
sections.
"i"
"=info"
Displays the contents of the .debug_info section. Note: the
output from this option can also be restricted by the use of
the --dwarf-depth and --dwarf-start options.
"k"
"=links"
Displays the contents of the .gnu_debuglink and/or
.gnu_debugaltlink sections. Also displays any links to
separate dwarf object files (dwo), if they are specified by the
DW_AT_GNU_dwo_name or DW_AT_dwo_name attributes in the
.debug_info section.
"K"
"=follow-links"
Display the contents of any selected debug sections that are
found in linked, separate debug info file(s). This can result
in multiple versions of the same debug section being displayed
if it exists in more than one file.
In addition, when displaying DWARF attributes, if a form is
found that references the separate debug info file, then the
referenced contents will also be displayed.
"l"
"=rawline"
Displays the contents of the .debug_line section in a raw
format.
"L"
"=decodedline"
Displays the interpreted contents of the .debug_line section.
"m"
"=macro"
Displays the contents of the .debug_macro and/or .debug_macinfo
sections.
"o"
"=loc"
Displays the contents of the .debug_loc and/or .debug_loclists
sections.
"O"
"=str-offsets"
Displays the contents of the .debug_str_offsets section.
"p"
"=pubnames"
Displays the contents of the .debug_pubnames and/or
.debug_gnu_pubnames sections.
"r"
"=aranges"
Displays the contents of the .debug_aranges section.
"R"
"=Ranges"
Displays the contents of the .debug_ranges and/or
.debug_rnglists sections.
"s"
"=str"
Displays the contents of the .debug_str, .debug_line_str and/or
.debug_str_offsets sections.
"t"
"=pubtype"
Displays the contents of the .debug_pubtypes and/or
.debug_gnu_pubtypes sections.
"T"
"=trace_aranges"
Displays the contents of the .trace_aranges section.
"u"
"=trace_abbrev"
Displays the contents of the .trace_abbrev section.
"U"
"=trace_info"
Displays the contents of the .trace_info section.
Note: displaying the contents of .debug_static_funcs,
.debug_static_vars and debug_weaknames sections is not currently
supported.
--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.
--ctf=section
Display the contents of the specified CTF section. CTF sections
themselves contain many subsections, all of which are displayed in
order.
--ctf-parent=section
Specify the name of another section from which the CTF dictionary
can inherit types. (If none is specified, we assume the CTF
dictionary inherits types from the default-named member of the
archive contained within this section.)
--ctf-symbols=section
--ctf-strings=section
Specify the name of another section from which the CTF file can
inherit strings and symbols. By default, the ".symtab" and its
linked string table are used.
If either of --ctf-symbols or --ctf-strings is specified, the other
must be specified as well.
-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.
-T
--silent-truncation
Normally when readelf is displaying a symbol name, and it has to
truncate the name to fit into an 80 column display, it will add a
suffix of "[...]" to the name. This command line option disables
this behaviour, allowing 5 more characters of the name to be
displayed and restoring the old behaviour of readelf (prior to
release 2.35).
-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) 1991-2020 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-2.35.1 2020-10-09 READELF(1)