readelf - Displays information about ELF files.
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[lLiaprmfFsoRtUuTgAckK]|
--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]]
[--dwarf-depth=n]
[--dwarf-start=n]
[-I|--histogram]
[-v|--version]
[-W|--wide]
[-H|--help]
elffile...
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.
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, preceded 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 preceded 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
- 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.
When displaying relocations, this option makes readelf
display the dynamic relocations rather than the static relocations.
- -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[lLiaprmfFsoRtUuTgAckK]
- --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]
- 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 the link to a separate
dwarf object file (dwo), if one is 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 a
linked, separate debug info file. This can result in multiple versions of
the same debug section being displayed if both the main file and the
separate debug info file contain sections with the same name.
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.
- "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.
- -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.
Copyright (c) 1991-2018 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".