readelf(1)



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[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...

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

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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

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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.

-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

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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"

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"=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

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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.

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"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.

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-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

     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".

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readelf(1)

NAME

SYNOPSIS

DESCRIPTION

OPTIONS

SEE ALSO

COPYRIGHT