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223 lines
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4 years ago
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<html lang="en">
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<head>
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<title>readelf - GNU Binary Utilities</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="GNU Binary Utilities">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="prev" href="dlltool.html#dlltool" title="dlltool">
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<link rel="next" href="elfedit.html#elfedit" title="elfedit">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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Copyright (C) 1991-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled ``GNU Free Documentation License''.
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--></style>
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</head>
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<body>
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<div class="node">
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<a name="readelf"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="elfedit.html#elfedit">elfedit</a>,
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Previous: <a rel="previous" accesskey="p" href="dlltool.html#dlltool">dlltool</a>,
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Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a>
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<hr>
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</div>
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<h2 class="chapter">15 readelf</h2>
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<p><a name="index-ELF-file-information-147"></a><a name="index-readelf-148"></a>
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<!-- man title readelf Displays information about ELF files. -->
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<pre class="smallexample"> <!-- man begin SYNOPSIS readelf -->
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readelf [<samp><span class="option">-a</span></samp>|<samp><span class="option">--all</span></samp>]
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[<samp><span class="option">-h</span></samp>|<samp><span class="option">--file-header</span></samp>]
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[<samp><span class="option">-l</span></samp>|<samp><span class="option">--program-headers</span></samp>|<samp><span class="option">--segments</span></samp>]
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[<samp><span class="option">-S</span></samp>|<samp><span class="option">--section-headers</span></samp>|<samp><span class="option">--sections</span></samp>]
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[<samp><span class="option">-g</span></samp>|<samp><span class="option">--section-groups</span></samp>]
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[<samp><span class="option">-t</span></samp>|<samp><span class="option">--section-details</span></samp>]
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[<samp><span class="option">-e</span></samp>|<samp><span class="option">--headers</span></samp>]
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[<samp><span class="option">-s</span></samp>|<samp><span class="option">--syms</span></samp>|<samp><span class="option">--symbols</span></samp>]
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[<samp><span class="option">--dyn-syms</span></samp>]
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[<samp><span class="option">-n</span></samp>|<samp><span class="option">--notes</span></samp>]
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[<samp><span class="option">-r</span></samp>|<samp><span class="option">--relocs</span></samp>]
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[<samp><span class="option">-u</span></samp>|<samp><span class="option">--unwind</span></samp>]
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[<samp><span class="option">-d</span></samp>|<samp><span class="option">--dynamic</span></samp>]
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[<samp><span class="option">-V</span></samp>|<samp><span class="option">--version-info</span></samp>]
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[<samp><span class="option">-A</span></samp>|<samp><span class="option">--arch-specific</span></samp>]
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[<samp><span class="option">-D</span></samp>|<samp><span class="option">--use-dynamic</span></samp>]
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[<samp><span class="option">-x</span></samp> <number or name>|<samp><span class="option">--hex-dump=</span></samp><number or name>]
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[<samp><span class="option">-p</span></samp> <number or name>|<samp><span class="option">--string-dump=</span></samp><number or name>]
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[<samp><span class="option">-R</span></samp> <number or name>|<samp><span class="option">--relocated-dump=</span></samp><number or name>]
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[<samp><span class="option">-z</span></samp>|<samp><span class="option">--decompress</span></samp>]
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[<samp><span class="option">-c</span></samp>|<samp><span class="option">--archive-index</span></samp>]
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[<samp><span class="option">-w[lLiaprmfFsoRt]</span></samp>|
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<samp><span class="option">--debug-dump</span></samp>[=rawline,=decodedline,=info,=abbrev,=pubnames,=aranges,=macro,=frames,=frames-interp,=str,=loc,=Ranges,=pubtypes,=trace_info,=trace_abbrev,=trace_aranges,=gdb_index]]
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[<samp><span class="option">--dwarf-depth=</span><var>n</var></samp>]
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[<samp><span class="option">--dwarf-start=</span><var>n</var></samp>]
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[<samp><span class="option">-I</span></samp>|<samp><span class="option">--histogram</span></samp>]
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[<samp><span class="option">-v</span></samp>|<samp><span class="option">--version</span></samp>]
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[<samp><span class="option">-W</span></samp>|<samp><span class="option">--wide</span></samp>]
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[<samp><span class="option">-H</span></samp>|<samp><span class="option">--help</span></samp>]
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<var>elffile</var>...
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<!-- man end -->
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</pre>
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<!-- man begin DESCRIPTION readelf -->
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<p><samp><span class="command">readelf</span></samp> displays information about one or more ELF format object
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files. The options control what particular information to display.
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<p><var>elffile</var><small class="dots">...</small> are the object files to be examined. 32-bit and
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64-bit ELF files are supported, as are archives containing ELF files.
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<p>This program performs a similar function to <samp><span class="command">objdump</span></samp> but it
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goes into more detail and it exists independently of the <span class="sc">bfd</span>
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library, so if there is a bug in <span class="sc">bfd</span> then readelf will not be
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affected.
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<!-- man end -->
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<!-- man begin OPTIONS readelf -->
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<p>The long and short forms of options, shown here as alternatives, are
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equivalent. At least one option besides ‘<samp><span class="samp">-v</span></samp>’ or ‘<samp><span class="samp">-H</span></samp>’ must be
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given.
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<dl>
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<dt><samp><span class="env">-a</span></samp><dt><samp><span class="env">--all</span></samp><dd>Equivalent to specifying <samp><span class="option">--file-header</span></samp>,
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<samp><span class="option">--program-headers</span></samp>, <samp><span class="option">--sections</span></samp>, <samp><span class="option">--symbols</span></samp>,
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<samp><span class="option">--relocs</span></samp>, <samp><span class="option">--dynamic</span></samp>, <samp><span class="option">--notes</span></samp> and
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<samp><span class="option">--version-info</span></samp>.
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<br><dt><samp><span class="env">-h</span></samp><dt><samp><span class="env">--file-header</span></samp><dd><a name="index-ELF-file-header-information-149"></a>Displays the information contained in the ELF header at the start of the
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file.
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<br><dt><samp><span class="env">-l</span></samp><dt><samp><span class="env">--program-headers</span></samp><dt><samp><span class="env">--segments</span></samp><dd><a name="index-ELF-program-header-information-150"></a><a name="index-ELF-segment-information-151"></a>Displays the information contained in the file's segment headers, if it
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has any.
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<br><dt><samp><span class="env">-S</span></samp><dt><samp><span class="env">--sections</span></samp><dt><samp><span class="env">--section-headers</span></samp><dd><a name="index-ELF-section-information-152"></a>Displays the information contained in the file's section headers, if it
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has any.
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<br><dt><samp><span class="env">-g</span></samp><dt><samp><span class="env">--section-groups</span></samp><dd><a name="index-ELF-section-group-information-153"></a>Displays the information contained in the file's section groups, if it
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has any.
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<br><dt><samp><span class="env">-t</span></samp><dt><samp><span class="env">--section-details</span></samp><dd><a name="index-ELF-section-information-154"></a>Displays the detailed section information. Implies <samp><span class="option">-S</span></samp>.
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<br><dt><samp><span class="env">-s</span></samp><dt><samp><span class="env">--symbols</span></samp><dt><samp><span class="env">--syms</span></samp><dd><a name="index-ELF-symbol-table-information-155"></a>Displays the entries in symbol table section of the file, if it has one.
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<br><dt><samp><span class="env">--dyn-syms</span></samp><dd><a name="index-ELF-dynamic-symbol-table-information-156"></a>Displays the entries in dynamic symbol table section of the file, if it
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has one.
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<br><dt><samp><span class="env">-e</span></samp><dt><samp><span class="env">--headers</span></samp><dd>Display all the headers in the file. Equivalent to <samp><span class="option">-h -l -S</span></samp>.
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<br><dt><samp><span class="env">-n</span></samp><dt><samp><span class="env">--notes</span></samp><dd><a name="index-ELF-notes-157"></a>Displays the contents of the NOTE segments and/or sections, if any.
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<br><dt><samp><span class="env">-r</span></samp><dt><samp><span class="env">--relocs</span></samp><dd><a name="index-ELF-reloc-information-158"></a>Displays the contents of the file's relocation section, if it has one.
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<br><dt><samp><span class="env">-u</span></samp><dt><samp><span class="env">--unwind</span></samp><dd><a name="index-unwind-information-159"></a>Displays the contents of the file's unwind section, if it has one. Only
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the unwind sections for IA64 ELF files, as well as ARM unwind tables
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(<code>.ARM.exidx</code> / <code>.ARM.extab</code>) are currently supported.
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<br><dt><samp><span class="env">-d</span></samp><dt><samp><span class="env">--dynamic</span></samp><dd><a name="index-ELF-dynamic-section-information-160"></a>Displays the contents of the file's dynamic section, if it has one.
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<br><dt><samp><span class="env">-V</span></samp><dt><samp><span class="env">--version-info</span></samp><dd><a name="index-ELF-version-sections-information-161"></a>Displays the contents of the version sections in the file, it they
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exist.
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<br><dt><samp><span class="env">-A</span></samp><dt><samp><span class="env">--arch-specific</span></samp><dd>Displays architecture-specific information in the file, if there
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is any.
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<br><dt><samp><span class="env">-D</span></samp><dt><samp><span class="env">--use-dynamic</span></samp><dd>When displaying symbols, this option makes <samp><span class="command">readelf</span></samp> use the
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symbol hash tables in the file's dynamic section, rather than the
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symbol table sections.
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<br><dt><samp><span class="env">-x <number or name></span></samp><dt><samp><span class="env">--hex-dump=<number or name></span></samp><dd>Displays the contents of the indicated section as a hexadecimal bytes.
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A number identifies a particular section by index in the section table;
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any other string identifies all sections with that name in the object file.
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<br><dt><samp><span class="env">-R <number or name></span></samp><dt><samp><span class="env">--relocated-dump=<number or name></span></samp><dd>Displays the contents of the indicated section as a hexadecimal
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bytes. A number identifies a particular section by index in the
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section table; any other string identifies all sections with that name
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in the object file. The contents of the section will be relocated
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before they are displayed.
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<br><dt><samp><span class="env">-p <number or name></span></samp><dt><samp><span class="env">--string-dump=<number or name></span></samp><dd>Displays the contents of the indicated section as printable strings.
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A number identifies a particular section by index in the section table;
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any other string identifies all sections with that name in the object file.
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<br><dt><samp><span class="env">-z</span></samp><dt><samp><span class="env">--decompress</span></samp><dd>Requests that the section(s) being dumped by <samp><span class="option">x</span></samp>, <samp><span class="option">R</span></samp> or
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<samp><span class="option">p</span></samp> options are decompressed before being displayed. If the
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section(s) are not compressed then they are displayed as is.
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<br><dt><samp><span class="env">-c</span></samp><dt><samp><span class="env">--archive-index</span></samp><dd><a name="index-Archive-file-symbol-index-information-162"></a>Displays the file symbol index information contained in the header part
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of binary archives. Performs the same function as the <samp><span class="option">t</span></samp>
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command to <samp><span class="command">ar</span></samp>, but without using the BFD library. See <a href="ar.html#ar">ar</a>.
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<br><dt><samp><span class="env">-w[lLiaprmfFsoRt]</span></samp><dt><samp><span class="env">--debug-dump[=rawline,=decodedline,=info,=abbrev,=pubnames,=aranges,=macro,=frames,=frames-interp,=str,=loc,=Ranges,=pubtypes,=trace_info,=trace_abbrev,=trace_aranges,=gdb_index]</span></samp><dd>Displays the contents of the debug sections in the file, if any are
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present. If one of the optional letters or words follows the switch
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then only data found in those specific sections will be dumped.
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<p>Note that there is no single letter option to display the content of
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trace sections or .gdb_index.
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<p>Note: the <samp><span class="option">=decodedline</span></samp> option will display the interpreted
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contents of a .debug_line section whereas the <samp><span class="option">=rawline</span></samp> option
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dumps the contents in a raw format.
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<p>Note: the <samp><span class="option">=frames-interp</span></samp> option will display the interpreted
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contents of a .debug_frame section whereas the <samp><span class="option">=frames</span></samp> option
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dumps the contents in a raw format.
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<p>Note: the output from the <samp><span class="option">=info</span></samp> option can also be affected
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by the options <samp><span class="option">--dwarf-depth</span></samp> and <samp><span class="option">--dwarf-start</span></samp>.
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<br><dt><samp><span class="env">--dwarf-depth=</span><var>n</var></samp><dd>Limit the dump of the <code>.debug_info</code> section to <var>n</var> children.
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This is only useful with <samp><span class="option">--debug-dump=info</span></samp>. The default is
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to print all DIEs; the special value 0 for <var>n</var> will also have this
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effect.
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<p>With a non-zero value for <var>n</var>, DIEs at or deeper than <var>n</var>
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levels will not be printed. The range for <var>n</var> is zero-based.
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<br><dt><samp><span class="env">--dwarf-start=</span><var>n</var></samp><dd>Print only DIEs beginning with the DIE numbered <var>n</var>. This is only
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useful with <samp><span class="option">--debug-dump=info</span></samp>.
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<p>If specified, this option will suppress printing of any header
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information and all DIEs before the DIE numbered <var>n</var>. Only
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siblings and children of the specified DIE will be printed.
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<p>This can be used in conjunction with <samp><span class="option">--dwarf-depth</span></samp>.
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<br><dt><samp><span class="env">-I</span></samp><dt><samp><span class="env">--histogram</span></samp><dd>Display a histogram of bucket list lengths when displaying the contents
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of the symbol tables.
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<br><dt><samp><span class="env">-v</span></samp><dt><samp><span class="env">--version</span></samp><dd>Display the version number of readelf.
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<br><dt><samp><span class="env">-W</span></samp><dt><samp><span class="env">--wide</span></samp><dd>Don't break output lines to fit into 80 columns. By default
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<samp><span class="command">readelf</span></samp> breaks section header and segment listing lines for
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64-bit ELF files, so that they fit into 80 columns. This option causes
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<samp><span class="command">readelf</span></samp> to print each section header resp. each segment one a
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single line, which is far more readable on terminals wider than 80 columns.
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<br><dt><samp><span class="env">-H</span></samp><dt><samp><span class="env">--help</span></samp><dd>Display the command line options understood by <samp><span class="command">readelf</span></samp>.
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</dl>
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<!-- man end -->
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</body></html>
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