binutils: readelf
14 readelf
**********
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, 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.
'-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. 
ar.
'-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'.
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