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326 lines
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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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<h2 class="chapter">14 readelf</h2>
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<p><a name="index-ELF-file-information-152"></a><a name="index-readelf-153"></a>
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<!-- man title readelf display 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[lLiaprmfFsoRtUuTgAckK]</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,=addr,=cu_index,=links,=follow-links]]
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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">--ctf=</span></samp><var>section</var>]
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[<samp><span class="option">--ctf-parent=</span></samp><var>section</var>]
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[<samp><span class="option">--ctf-symbols=</span></samp><var>section</var>]
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[<samp><span class="option">--ctf-strings=</span></samp><var>section</var>]
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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>,
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<samp><span class="option">--version-info</span></samp>, <samp><span class="option">--arch-specific</span></samp>, <samp><span class="option">--unwind</span></samp>,
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<samp><span class="option">--section-groups</span></samp> and <samp><span class="option">--histogram</span></samp>.
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<p>Note - this option does not enable <samp><span class="option">--use-dynamic</span></samp> itself, so
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if that option is not present on the command line then dynamic symbols
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and dynamic relocs will not be displayed.
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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-154"></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-155"></a><a name="index-ELF-segment-information-156"></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-157"></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-158"></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-159"></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-160"></a>Displays the entries in symbol table section of the file, if it has one.
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If a symbol has version information associated with it then this is
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displayed as well. The version string is displayed as a suffix to the
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symbol name, preceeded by an @ character. For example
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‘<samp><span class="samp">foo@VER_1</span></samp>’. If the version is the default version to be used
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when resolving unversioned references to the symbol then it is
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displayed as a suffix preceeded by two @ characters. For example
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‘<samp><span class="samp">foo@@VER_2</span></samp>’.
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<br><dt><samp><span class="env">--dyn-syms</span></samp><dd><a name="index-ELF-dynamic-symbol-table-information-161"></a>Displays the entries in dynamic symbol table section of the file, if it
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has one. The output format is the same as the format used by the
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<samp><span class="option">--syms</span></samp> option.
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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-162"></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-163"></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-164"></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. If
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support is not yet implemented for your architecture you could try
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dumping the contents of the <var>.eh_frames</var> section using the
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<samp><span class="option">--debug-dump=frames</span></samp> or <samp><span class="option">--debug-dump=frames-interp</span></samp>
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options.
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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-165"></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-166"></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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<p>When displaying relocations, this option makes <samp><span class="command">readelf</span></samp>
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display the dynamic relocations rather than the static relocations.
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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-167"></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[lLiaprmfFsoRtUuTgAckK]</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,=addr,=cu_index,=links,=follow-links]</span></samp><dd><!-- This file contains the entry for the -w/-debug-dump (readelf) and -->
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<!-- W/-dwarf (objdump) option that is common to both readelf and objdump. -->
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<p>Displays the contents of the DWARF debug sections in the file, if any
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are present. Compressed debug sections are automatically decompressed
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(temporarily) before they are displayed. If one or more of the
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optional letters or words follows the switch then only those type(s)
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of data will be dumped. The letters and words refer to the following
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information:
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<!-- Please Keep This Table Alpha Sorted. -->
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<dl>
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<dt><code>a</code><dt><code>=abbrev</code><dd>Displays the contents of the ‘<samp><span class="samp">.debug_abbrev</span></samp>’ section.
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<br><dt><code>A</code><dt><code>=addr</code><dd>Displays the contents of the ‘<samp><span class="samp">.debug_addr</span></samp>’ section.
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<br><dt><code>c</code><dt><code>=cu_index</code><dd>Displays the contents of the ‘<samp><span class="samp">.debug_cu_index</span></samp>’ and/or
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‘<samp><span class="samp">.debug_tu_index</span></samp>’ sections.
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<br><dt><code>f</code><dt><code>=frames</code><dd>Display the raw contents of a ‘<samp><span class="samp">.debug_frame</span></samp>’ section.
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<br><dt><code>F</code><br><dt><code>=frame-interp</code><dd>Display the interpreted contents of a ‘<samp><span class="samp">.debug_frame</span></samp>’ section.
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<br><dt><code>g</code><dt><code>=gdb_index</code><dd>Displays the contents of the ‘<samp><span class="samp">.gdb_index</span></samp>’ and/or
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‘<samp><span class="samp">.debug_names</span></samp>’ sections.
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<br><dt><code>i</code><dt><code>=info</code><dd>Displays the contents of the ‘<samp><span class="samp">.debug_info</span></samp>’ section. Note: the
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output from this option can also be restricted by the use of the
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<samp><span class="option">--dwarf-depth</span></samp> and <samp><span class="option">--dwarf-start</span></samp> options.
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<br><dt><code>k</code><dt><code>=links</code><dd>Displays the contents of the ‘<samp><span class="samp">.gnu_debuglink</span></samp>’ and/or
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‘<samp><span class="samp">.gnu_debugaltlink</span></samp>’ sections. Also displays any links to
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separate dwarf object files (dwo), if they are specified by the
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DW_AT_GNU_dwo_name or DW_AT_dwo_name attributes in the
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‘<samp><span class="samp">.debug_info</span></samp>’ section.
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<br><dt><code>K</code><dt><code>=follow-links</code><dd>Display the contents of any selected debug sections that are found in
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linked, separate debug info file(s). This can result in multiple
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versions of the same debug section being displayed if it exists in
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more than one file.
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<p>In addition, when displaying DWARF attributes, if a form is found that
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references the separate debug info file, then the referenced contents
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will also be displayed.
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<br><dt><code>l</code><dt><code>=rawline</code><dd>Displays the contents of the ‘<samp><span class="samp">.debug_line</span></samp>’ section in a raw
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format.
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<br><dt><code>L</code><br><dt><code>=decodedline</code><dd>Displays the interpreted contents of the ‘<samp><span class="samp">.debug_line</span></samp>’ section.
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<br><dt><code>m</code><dt><code>=macro</code><dd>Displays the contents of the ‘<samp><span class="samp">.debug_macro</span></samp>’ and/or
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‘<samp><span class="samp">.debug_macinfo</span></samp>’ sections.
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<br><dt><code>o</code><dt><code>=loc</code><dd>Displays the contents of the ‘<samp><span class="samp">.debug_loc</span></samp>’ and/or
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‘<samp><span class="samp">.debug_loclists</span></samp>’ sections.
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<br><dt><code>p</code><dt><code>=pubnames</code><dd>Displays the contents of the ‘<samp><span class="samp">.debug_pubnames</span></samp>’ and/or
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‘<samp><span class="samp">.debug_gnu_pubnames</span></samp>’ sections.
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<br><dt><code>r</code><dt><code>=aranges</code><dd>Displays the contents of the ‘<samp><span class="samp">.debug_aranges</span></samp>’ section.
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<br><dt><code>R</code><dt><code>=Ranges</code><dd>Displays the contents of the ‘<samp><span class="samp">.debug_ranges</span></samp>’ and/or
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‘<samp><span class="samp">.debug_rnglists</span></samp>’ sections.
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<br><dt><code>s</code><dt><code>=str</code><dd>Displays the contents of the ‘<samp><span class="samp">.debug_str</span></samp>’, ‘<samp><span class="samp">.debug_line_str</span></samp>’
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and/or ‘<samp><span class="samp">.debug_str_offsets</span></samp>’ sections.
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<br><dt><code>t</code><dt><code>=pubtype</code><dd>Displays the contents of the ‘<samp><span class="samp">.debug_pubtypes</span></samp>’ and/or
|
|
‘<samp><span class="samp">.debug_gnu_pubtypes</span></samp>’ sections.
|
|
|
|
<br><dt><code>T</code><dt><code>=trace_aranges</code><dd>Displays the contents of the ‘<samp><span class="samp">.trace_aranges</span></samp>’ section.
|
|
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|
<br><dt><code>u</code><dt><code>=trace_abbrev</code><dd>Displays the contents of the ‘<samp><span class="samp">.trace_abbrev</span></samp>’ section.
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|
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|
<br><dt><code>U</code><dt><code>=trace_info</code><dd>Displays the contents of the ‘<samp><span class="samp">.trace_info</span></samp>’ section.
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|
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|
</dl>
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|
<p>Note: displaying the contents of ‘<samp><span class="samp">.debug_static_funcs</span></samp>’,
|
|
‘<samp><span class="samp">.debug_static_vars</span></samp>’ and ‘<samp><span class="samp">debug_weaknames</span></samp>’ sections is not
|
|
currently supported.
|
|
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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.
|
|
This is only useful with <samp><span class="option">--debug-dump=info</span></samp>. The default is
|
|
to print all DIEs; the special value 0 for <var>n</var> will also have this
|
|
effect.
|
|
|
|
<p>With a non-zero value for <var>n</var>, DIEs at or deeper than <var>n</var>
|
|
levels will not be printed. The range for <var>n</var> is zero-based.
|
|
|
|
<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
|
|
useful with <samp><span class="option">--debug-dump=info</span></samp>.
|
|
|
|
<p>If specified, this option will suppress printing of any header
|
|
information and all DIEs before the DIE numbered <var>n</var>. Only
|
|
siblings and children of the specified DIE will be printed.
|
|
|
|
<p>This can be used in conjunction with <samp><span class="option">--dwarf-depth</span></samp>.
|
|
|
|
<!-- This file contains the entry for the -ctf, -ctf-parent, -ctf-symbols, -and -->
|
|
<!-- ctf-strings options that are common to both readelf and objdump. -->
|
|
<br><dt><samp><span class="env">--ctf=</span><var>section</var></samp><dd><a name="index-CTF-168"></a><a name="index-Compact-Type-Format-169"></a>
|
|
Display the contents of the specified CTF section. CTF sections themselves
|
|
contain many subsections, all of which are displayed in order.
|
|
|
|
<br><dt><samp><span class="env">--ctf-parent=</span><var>section</var></samp><dd>
|
|
Specify the name of another section from which the CTF file can inherit
|
|
types.
|
|
<br><dt><samp><span class="env">--ctf-symbols=</span><var>section</var></samp><br><dt><samp><span class="env">--ctf-strings=</span><var>section</var></samp><dd>Specify the name of another section from which the CTF file can inherit
|
|
strings and symbols.
|
|
|
|
<p>If either of <samp><span class="option">--ctf-symbols</span></samp> or <samp><span class="option">--ctf-strings</span></samp> is specified, the
|
|
other must be specified as well.
|
|
|
|
<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
|
|
of the symbol tables.
|
|
|
|
<br><dt><samp><span class="env">-v</span></samp><dt><samp><span class="env">--version</span></samp><dd>Display the version number of readelf.
|
|
|
|
<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
|
|
<samp><span class="command">readelf</span></samp> breaks section header and segment listing lines for
|
|
64-bit ELF files, so that they fit into 80 columns. This option causes
|
|
<samp><span class="command">readelf</span></samp> to print each section header resp. each segment one a
|
|
single line, which is far more readable on terminals wider than 80 columns.
|
|
|
|
<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>.
|
|
|
|
</dl>
|
|
|
|
<!-- man end -->
|
|
</body></html>
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|