readelf

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|--lto-syms]
               [--demangle=style|--no-demangle]
               [--recurse-limit|--no-recurse-limit]
               [-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, 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.

       --lto-syms
           Displays the contents of any LTO symbol tables in the file.

       -C
       --demangle[=style]
           Decode (demangle) low-level symbol names into user-level names.  This
           makes C++ function names readable.  Different compilers have
           different mangling styles.  The optional demangling style argument
           can be used to choose an appropriate demangling style for your
           compiler.

       --no-demangle
           Do not demangle low-level symbol names.  This is the default.

       --recurse-limit
       --no-recurse-limit
       --recursion-limit
       --no-recursion-limit
           Enables or disables a limit on the amount of recursion performed
           whilst demangling strings.  Since the name mangling formats allow for
           an infinite level of recursion it is possible to create strings whose
           decoding will exhaust the amount of stack space available on the host
           machine, triggering a memory fault.  The limit tries to prevent this
           from happening by restricting recursion to 2048 levels of nesting.

           The default is for this limit to be enabled, but disabling it may be
           necessary in order to demangle truly complicated names.  Note however
           that if the recursion limit is disabled then stack exhaustion is
           possible and any bug reports about such an event will be rejected.

       -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) 1991-2021 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-2.36.1                    2021-02-06                         READELF(1)