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<a name="elfedit-1"></a>
<h2 class="chapter">15 elfedit</h2>

<a name="index-Update-ELF-header"></a>
<a name="index-elfedit"></a>


<div class="smallexample">
<pre class="smallexample">elfedit [<samp>--input-mach=</samp><var>machine</var>]
        [<samp>--input-type=</samp><var>type</var>]
        [<samp>--input-osabi=</samp><var>osabi</var>]
        <samp>--output-mach=</samp><var>machine</var>
        <samp>--output-type=</samp><var>type</var>
        <samp>--output-osabi=</samp><var>osabi</var>
        <samp>--enable-x86-feature=</samp><var>feature</var>
        <samp>--disable-x86-feature=</samp><var>feature</var>
        [<samp>-v</samp>|<samp>--version</samp>]
        [<samp>-h</samp>|<samp>--help</samp>]
        <var>elffile</var>&hellip;
</pre></div>


<p><code>elfedit</code> updates the ELF header and program property of ELF
files which have the matching ELF machine and file types.  The options
control how and which fields in the ELF header and program property
should be updated.
</p>
<p><var>elffile</var>&hellip; are the ELF files to be updated.  32-bit and
64-bit ELF files are supported, as are archives containing ELF files.
</p>

<p>The long and short forms of options, shown here as alternatives, are
equivalent. At least one of the <samp>--output-mach</samp>,
<samp>--output-type</samp>, <samp>--output-osabi</samp>,
<samp>--enable-x86-feature</samp> and <samp>--disable-x86-feature</samp>
options must be given.
</p>
<dl compact="compact">
<dt><code>--input-mach=<var>machine</var></code></dt>
<dd><p>Set the matching input ELF machine type to <var>machine</var>.  If
<samp>--input-mach</samp> isn&rsquo;t specified, it will match any ELF
machine types.
</p>
<p>The supported ELF machine types are, <var>i386</var>, <var>IAMCU</var>, <var>L1OM</var>,
<var>K1OM</var> and <var>x86-64</var>.
</p>
</dd>
<dt><code>--output-mach=<var>machine</var></code></dt>
<dd><p>Change the ELF machine type in the ELF header to <var>machine</var>.  The
supported ELF machine types are the same as <samp>--input-mach</samp>.
</p>
</dd>
<dt><code>--input-type=<var>type</var></code></dt>
<dd><p>Set the matching input ELF file type to <var>type</var>.  If
<samp>--input-type</samp> isn&rsquo;t specified, it will match any ELF file types.
</p>
<p>The supported ELF file types are, <var>rel</var>, <var>exec</var> and <var>dyn</var>.
</p>
</dd>
<dt><code>--output-type=<var>type</var></code></dt>
<dd><p>Change the ELF file type in the ELF header to <var>type</var>.  The
supported ELF types are the same as <samp>--input-type</samp>.
</p>
</dd>
<dt><code>--input-osabi=<var>osabi</var></code></dt>
<dd><p>Set the matching input ELF file OSABI to <var>osabi</var>.  If
<samp>--input-osabi</samp> isn&rsquo;t specified, it will match any ELF OSABIs.
</p>
<p>The supported ELF OSABIs are, <var>none</var>, <var>HPUX</var>, <var>NetBSD</var>,
<var>GNU</var>, <var>Linux</var> (alias for <var>GNU</var>),
<var>Solaris</var>, <var>AIX</var>, <var>Irix</var>,
<var>FreeBSD</var>, <var>TRU64</var>, <var>Modesto</var>, <var>OpenBSD</var>, <var>OpenVMS</var>,
<var>NSK</var>, <var>AROS</var> and <var>FenixOS</var>.
</p>
</dd>
<dt><code>--output-osabi=<var>osabi</var></code></dt>
<dd><p>Change the ELF OSABI in the ELF header to <var>osabi</var>.  The
supported ELF OSABI are the same as <samp>--input-osabi</samp>.
</p>
</dd>
<dt><code>--enable-x86-feature=<var>feature</var></code></dt>
<dd><p>Set the <var>feature</var> bit in program property in <var>exec</var> or <var>dyn</var>
ELF files with machine types of <var>i386</var> or <var>x86-64</var>.  The
supported features are, <var>ibt</var> and <var>shstk</var>.
</p>
</dd>
<dt><code>--disable-x86-feature=<var>feature</var></code></dt>
<dd><p>Clear the <var>feature</var> bit in program property in <var>exec</var> or
<var>dyn</var> ELF files with machine types of <var>i386</var> or <var>x86-64</var>.
The supported features are the same as <samp>--enable-x86-feature</samp>.
</p>
<p>Note: <samp>--enable-x86-feature</samp> and <samp>--disable-x86-feature</samp>
are available only on hosts with &lsquo;<samp>mmap</samp>&rsquo; support.
</p>
</dd>
<dt><code>-v</code></dt>
<dt><code>--version</code></dt>
<dd><p>Display the version number of <code>elfedit</code>.
</p>
</dd>
<dt><code>-h</code></dt>
<dt><code>--help</code></dt>
<dd><p>Display the command-line options understood by <code>elfedit</code>.
</p>
</dd>
</dl>


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