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| <a name="readelf-1"></a> |
| <h2 class="chapter">15 readelf</h2> |
| |
| <a name="index-ELF-file-information"></a> |
| <a name="index-readelf"></a> |
| |
| |
| <div class="smallexample"> |
| <pre class="smallexample">readelf [<samp>-a</samp>|<samp>--all</samp>] |
| [<samp>-h</samp>|<samp>--file-header</samp>] |
| [<samp>-l</samp>|<samp>--program-headers</samp>|<samp>--segments</samp>] |
| [<samp>-S</samp>|<samp>--section-headers</samp>|<samp>--sections</samp>] |
| [<samp>-g</samp>|<samp>--section-groups</samp>] |
| [<samp>-t</samp>|<samp>--section-details</samp>] |
| [<samp>-e</samp>|<samp>--headers</samp>] |
| [<samp>-s</samp>|<samp>--syms</samp>|<samp>--symbols</samp>] |
| [<samp>--dyn-syms</samp>] |
| [<samp>-n</samp>|<samp>--notes</samp>] |
| [<samp>-r</samp>|<samp>--relocs</samp>] |
| [<samp>-u</samp>|<samp>--unwind</samp>] |
| [<samp>-d</samp>|<samp>--dynamic</samp>] |
| [<samp>-V</samp>|<samp>--version-info</samp>] |
| [<samp>-A</samp>|<samp>--arch-specific</samp>] |
| [<samp>-D</samp>|<samp>--use-dynamic</samp>] |
| [<samp>-x</samp> <number or name>|<samp>--hex-dump=</samp><number or name>] |
| [<samp>-p</samp> <number or name>|<samp>--string-dump=</samp><number or name>] |
| [<samp>-R</samp> <number or name>|<samp>--relocated-dump=</samp><number or name>] |
| [<samp>-z</samp>|<samp>--decompress</samp>] |
| [<samp>-c</samp>|<samp>--archive-index</samp>] |
| [<samp>-w[lLiaprmfFsoRt]</samp>| |
| <samp>--debug-dump</samp>[=rawline,=decodedline,=info,=abbrev,=pubnames,=aranges,=macro,=frames,=frames-interp,=str,=loc,=Ranges,=pubtypes,=trace_info,=trace_abbrev,=trace_aranges,=gdb_index]] |
| [<samp>--dwarf-depth=<var>n</var></samp>] |
| [<samp>--dwarf-start=<var>n</var></samp>] |
| [<samp>-I</samp>|<samp>--histogram</samp>] |
| [<samp>-v</samp>|<samp>--version</samp>] |
| [<samp>-W</samp>|<samp>--wide</samp>] |
| [<samp>-H</samp>|<samp>--help</samp>] |
| <var>elffile</var>… |
| </pre></div> |
| |
| |
| <p><code>readelf</code> displays information about one or more ELF format object |
| files. The options control what particular information to display. |
| </p> |
| <p><var>elffile</var>… are the object files to be examined. 32-bit and |
| 64-bit ELF files are supported, as are archives containing ELF files. |
| </p> |
| <p>This program performs a similar function to <code>objdump</code> but it |
| goes into more detail and it exists independently of the <small>BFD</small> |
| library, so if there is a bug in <small>BFD</small> then readelf will not be |
| affected. |
| </p> |
| |
| |
| <p>The long and short forms of options, shown here as alternatives, are |
| equivalent. At least one option besides ‘<samp>-v</samp>’ or ‘<samp>-H</samp>’ must be |
| given. |
| </p> |
| <dl compact="compact"> |
| <dt><code>-a</code></dt> |
| <dt><code>--all</code></dt> |
| <dd><p>Equivalent to specifying <samp>--file-header</samp>, |
| <samp>--program-headers</samp>, <samp>--sections</samp>, <samp>--symbols</samp>, |
| <samp>--relocs</samp>, <samp>--dynamic</samp>, <samp>--notes</samp> and |
| <samp>--version-info</samp>. |
| </p> |
| </dd> |
| <dt><code>-h</code></dt> |
| <dt><code>--file-header</code></dt> |
| <dd><a name="index-ELF-file-header-information"></a> |
| <p>Displays the information contained in the ELF header at the start of the |
| file. |
| </p> |
| </dd> |
| <dt><code>-l</code></dt> |
| <dt><code>--program-headers</code></dt> |
| <dt><code>--segments</code></dt> |
| <dd><a name="index-ELF-program-header-information"></a> |
| <a name="index-ELF-segment-information"></a> |
| <p>Displays the information contained in the file’s segment headers, if it |
| has any. |
| </p> |
| </dd> |
| <dt><code>-S</code></dt> |
| <dt><code>--sections</code></dt> |
| <dt><code>--section-headers</code></dt> |
| <dd><a name="index-ELF-section-information"></a> |
| <p>Displays the information contained in the file’s section headers, if it |
| has any. |
| </p> |
| </dd> |
| <dt><code>-g</code></dt> |
| <dt><code>--section-groups</code></dt> |
| <dd><a name="index-ELF-section-group-information"></a> |
| <p>Displays the information contained in the file’s section groups, if it |
| has any. |
| </p> |
| </dd> |
| <dt><code>-t</code></dt> |
| <dt><code>--section-details</code></dt> |
| <dd><a name="index-ELF-section-information-1"></a> |
| <p>Displays the detailed section information. Implies <samp>-S</samp>. |
| </p> |
| </dd> |
| <dt><code>-s</code></dt> |
| <dt><code>--symbols</code></dt> |
| <dt><code>--syms</code></dt> |
| <dd><a name="index-ELF-symbol-table-information"></a> |
| <p>Displays the entries in symbol table section of the file, if it has one. |
| </p> |
| </dd> |
| <dt><code>--dyn-syms</code></dt> |
| <dd><a name="index-ELF-dynamic-symbol-table-information"></a> |
| <p>Displays the entries in dynamic symbol table section of the file, if it |
| has one. |
| </p> |
| </dd> |
| <dt><code>-e</code></dt> |
| <dt><code>--headers</code></dt> |
| <dd><p>Display all the headers in the file. Equivalent to <samp>-h -l -S</samp>. |
| </p> |
| </dd> |
| <dt><code>-n</code></dt> |
| <dt><code>--notes</code></dt> |
| <dd><a name="index-ELF-notes"></a> |
| <p>Displays the contents of the NOTE segments and/or sections, if any. |
| </p> |
| </dd> |
| <dt><code>-r</code></dt> |
| <dt><code>--relocs</code></dt> |
| <dd><a name="index-ELF-reloc-information"></a> |
| <p>Displays the contents of the file’s relocation section, if it has one. |
| </p> |
| </dd> |
| <dt><code>-u</code></dt> |
| <dt><code>--unwind</code></dt> |
| <dd><a name="index-unwind-information"></a> |
| <p>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 |
| (<code>.ARM.exidx</code> / <code>.ARM.extab</code>) are currently supported. |
| </p> |
| </dd> |
| <dt><code>-d</code></dt> |
| <dt><code>--dynamic</code></dt> |
| <dd><a name="index-ELF-dynamic-section-information"></a> |
| <p>Displays the contents of the file’s dynamic section, if it has one. |
| </p> |
| </dd> |
| <dt><code>-V</code></dt> |
| <dt><code>--version-info</code></dt> |
| <dd><a name="index-ELF-version-sections-information"></a> |
| <p>Displays the contents of the version sections in the file, it they |
| exist. |
| </p> |
| </dd> |
| <dt><code>-A</code></dt> |
| <dt><code>--arch-specific</code></dt> |
| <dd><p>Displays architecture-specific information in the file, if there |
| is any. |
| </p> |
| </dd> |
| <dt><code>-D</code></dt> |
| <dt><code>--use-dynamic</code></dt> |
| <dd><p>When displaying symbols, this option makes <code>readelf</code> use the |
| symbol hash tables in the file’s dynamic section, rather than the |
| symbol table sections. |
| </p> |
| </dd> |
| <dt><code>-x <number or name></code></dt> |
| <dt><code>--hex-dump=<number or name></code></dt> |
| <dd><p>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. |
| </p> |
| </dd> |
| <dt><code>-R <number or name></code></dt> |
| <dt><code>--relocated-dump=<number or name></code></dt> |
| <dd><p>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> |
| </dd> |
| <dt><code>-p <number or name></code></dt> |
| <dt><code>--string-dump=<number or name></code></dt> |
| <dd><p>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. |
| </p> |
| </dd> |
| <dt><code>-z</code></dt> |
| <dt><code>--decompress</code></dt> |
| <dd><p>Requests that the section(s) being dumped by <samp>x</samp>, <samp>R</samp> or |
| <samp>p</samp> options are decompressed before being displayed. If the |
| section(s) are not compressed then they are displayed as is. |
| </p> |
| </dd> |
| <dt><code>-c</code></dt> |
| <dt><code>--archive-index</code></dt> |
| <dd><a name="index-Archive-file-symbol-index-information"></a> |
| <p>Displays the file symbol index information contained in the header part |
| of binary archives. Performs the same function as the <samp>t</samp> |
| command to <code>ar</code>, but without using the BFD library. See <a href="ar.html#ar">ar</a>. |
| </p> |
| </dd> |
| <dt><code>-w[lLiaprmfFsoRt]</code></dt> |
| <dt><code>--debug-dump[=rawline,=decodedline,=info,=abbrev,=pubnames,=aranges,=macro,=frames,=frames-interp,=str,=loc,=Ranges,=pubtypes,=trace_info,=trace_abbrev,=trace_aranges,=gdb_index]</code></dt> |
| <dd><p>Displays the contents of the debug sections in the file, if any are |
| present. If one of the optional letters or words follows the switch |
| then only data found in those specific sections will be dumped. |
| </p> |
| <p>Note that there is no single letter option to display the content of |
| trace sections or .gdb_index. |
| </p> |
| <p>Note: the <samp>=decodedline</samp> option will display the interpreted |
| contents of a .debug_line section whereas the <samp>=rawline</samp> option |
| dumps the contents in a raw format. |
| </p> |
| <p>Note: the <samp>=frames-interp</samp> option will display the interpreted |
| contents of a .debug_frame section whereas the <samp>=frames</samp> option |
| dumps the contents in a raw format. |
| </p> |
| <p>Note: the output from the <samp>=info</samp> option can also be affected |
| by the options <samp>--dwarf-depth</samp> and <samp>--dwarf-start</samp>. |
| </p> |
| </dd> |
| <dt><code>--dwarf-depth=<var>n</var></code></dt> |
| <dd><p>Limit the dump of the <code>.debug_info</code> section to <var>n</var> children. |
| This is only useful with <samp>--debug-dump=info</samp>. The default is |
| to print all DIEs; the special value 0 for <var>n</var> will also have this |
| effect. |
| </p> |
| <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. |
| </p> |
| </dd> |
| <dt><code>--dwarf-start=<var>n</var></code></dt> |
| <dd><p>Print only DIEs beginning with the DIE numbered <var>n</var>. This is only |
| useful with <samp>--debug-dump=info</samp>. |
| </p> |
| <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> |
| <p>This can be used in conjunction with <samp>--dwarf-depth</samp>. |
| </p> |
| </dd> |
| <dt><code>-I</code></dt> |
| <dt><code>--histogram</code></dt> |
| <dd><p>Display a histogram of bucket list lengths when displaying the contents |
| of the symbol tables. |
| </p> |
| </dd> |
| <dt><code>-v</code></dt> |
| <dt><code>--version</code></dt> |
| <dd><p>Display the version number of readelf. |
| </p> |
| </dd> |
| <dt><code>-W</code></dt> |
| <dt><code>--wide</code></dt> |
| <dd><p>Don’t break output lines to fit into 80 columns. By default |
| <code>readelf</code> breaks section header and segment listing lines for |
| 64-bit ELF files, so that they fit into 80 columns. This option causes |
| <code>readelf</code> to print each section header resp. each segment one a |
| single line, which is far more readable on terminals wider than 80 columns. |
| </p> |
| </dd> |
| <dt><code>-H</code></dt> |
| <dt><code>--help</code></dt> |
| <dd><p>Display the command line options understood by <code>readelf</code>. |
| </p> |
| </dd> |
| </dl> |
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