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<a name="MRI"></a>
<div class="header">
<p>
Next: <a href="GNU-Free-Documentation-License.html#GNU-Free-Documentation-License" accesskey="n" rel="next">GNU Free Documentation License</a>, Previous: <a href="Reporting-Bugs.html#Reporting-Bugs" accesskey="p" rel="prev">Reporting Bugs</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="LD-Index.html#LD-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="MRI-Compatible-Script-Files"></a>
<h2 class="appendix">Appendix A MRI Compatible Script Files</h2>
<a name="index-MRI-compatibility"></a>
<p>To aid users making the transition to <small>GNU</small> <code>ld</code> from the MRI
linker, <code>ld</code> can use MRI compatible linker scripts as an
alternative to the more general-purpose linker scripting language
described in <a href="Scripts.html#Scripts">Scripts</a>.  MRI compatible linker scripts have a much
simpler command set than the scripting language otherwise used with
<code>ld</code>.  <small>GNU</small> <code>ld</code> supports the most commonly used MRI
linker commands; these commands are described here.
</p>
<p>In general, MRI scripts aren&rsquo;t of much use with the <code>a.out</code> object
file format, since it only has three sections and MRI scripts lack some
features to make use of them.
</p>
<p>You can specify a file containing an MRI-compatible script using the
&lsquo;<samp>-c</samp>&rsquo; command-line option.
</p>
<p>Each command in an MRI-compatible script occupies its own line; each
command line starts with the keyword that identifies the command (though
blank lines are also allowed for punctuation).  If a line of an
MRI-compatible script begins with an unrecognized keyword, <code>ld</code>
issues a warning message, but continues processing the script.
</p>
<p>Lines beginning with &lsquo;<samp>*</samp>&rsquo; are comments.
</p>
<p>You can write these commands using all upper-case letters, or all
lower case; for example, &lsquo;<samp>chip</samp>&rsquo; is the same as &lsquo;<samp>CHIP</samp>&rsquo;.
The following list shows only the upper-case form of each command.
</p>
<dl compact="compact">
<dd><a name="index-ABSOLUTE-_0028MRI_0029"></a>
</dd>
<dt><code>ABSOLUTE <var>secname</var></code></dt>
<dt><code>ABSOLUTE <var>secname</var>, <var>secname</var>, &hellip; <var>secname</var></code></dt>
<dd><p>Normally, <code>ld</code> includes in the output file all sections from all
the input files.  However, in an MRI-compatible script, you can use the
<code>ABSOLUTE</code> command to restrict the sections that will be present in
your output program.  If the <code>ABSOLUTE</code> command is used at all in a
script, then only the sections named explicitly in <code>ABSOLUTE</code>
commands will appear in the linker output.  You can still use other
input sections (whatever you select on the command line, or using
<code>LOAD</code>) to resolve addresses in the output file.
</p>
<a name="index-ALIAS-_0028MRI_0029"></a>
</dd>
<dt><code>ALIAS <var>out-secname</var>, <var>in-secname</var></code></dt>
<dd><p>Use this command to place the data from input section <var>in-secname</var>
in a section called <var>out-secname</var> in the linker output file.
</p>
<p><var>in-secname</var> may be an integer.
</p>
<a name="index-ALIGN-_0028MRI_0029"></a>
</dd>
<dt><code>ALIGN <var>secname</var> = <var>expression</var></code></dt>
<dd><p>Align the section called <var>secname</var> to <var>expression</var>.  The
<var>expression</var> should be a power of two.
</p>
<a name="index-BASE-_0028MRI_0029"></a>
</dd>
<dt><code>BASE <var>expression</var></code></dt>
<dd><p>Use the value of <var>expression</var> as the lowest address (other than
absolute addresses) in the output file.
</p>
<a name="index-CHIP-_0028MRI_0029"></a>
</dd>
<dt><code>CHIP <var>expression</var></code></dt>
<dt><code>CHIP <var>expression</var>, <var>expression</var></code></dt>
<dd><p>This command does nothing; it is accepted only for compatibility.
</p>
<a name="index-END-_0028MRI_0029"></a>
</dd>
<dt><code>END</code></dt>
<dd><p>This command does nothing whatever; it&rsquo;s only accepted for compatibility.
</p>
<a name="index-FORMAT-_0028MRI_0029"></a>
</dd>
<dt><code>FORMAT <var>output-format</var></code></dt>
<dd><p>Similar to the <code>OUTPUT_FORMAT</code> command in the more general linker
language, but restricted to S-records, if <var>output-format</var> is &lsquo;<samp>S</samp>&rsquo;
</p>
<a name="index-LIST-_0028MRI_0029"></a>
</dd>
<dt><code>LIST <var>anything</var>&hellip;</code></dt>
<dd><p>Print (to the standard output file) a link map, as produced by the
<code>ld</code> command-line option &lsquo;<samp>-M</samp>&rsquo;.
</p>
<p>The keyword <code>LIST</code> may be followed by anything on the
same line, with no change in its effect.
</p>
<a name="index-LOAD-_0028MRI_0029"></a>
</dd>
<dt><code>LOAD <var>filename</var></code></dt>
<dt><code>LOAD <var>filename</var>, <var>filename</var>, &hellip; <var>filename</var></code></dt>
<dd><p>Include one or more object file <var>filename</var> in the link; this has the
same effect as specifying <var>filename</var> directly on the <code>ld</code>
command line.
</p>
<a name="index-NAME-_0028MRI_0029"></a>
</dd>
<dt><code>NAME <var>output-name</var></code></dt>
<dd><p><var>output-name</var> is the name for the program produced by <code>ld</code>; the
MRI-compatible command <code>NAME</code> is equivalent to the command-line
option &lsquo;<samp>-o</samp>&rsquo; or the general script language command <code>OUTPUT</code>.
</p>
<a name="index-ORDER-_0028MRI_0029"></a>
</dd>
<dt><code>ORDER <var>secname</var>, <var>secname</var>, &hellip; <var>secname</var></code></dt>
<dt><code>ORDER <var>secname</var> <var>secname</var> <var>secname</var></code></dt>
<dd><p>Normally, <code>ld</code> orders the sections in its output file in the
order in which they first appear in the input files.  In an MRI-compatible
script, you can override this ordering with the <code>ORDER</code> command.  The
sections you list with <code>ORDER</code> will appear first in your output
file, in the order specified.
</p>
<a name="index-PUBLIC-_0028MRI_0029"></a>
</dd>
<dt><code>PUBLIC <var>name</var>=<var>expression</var></code></dt>
<dt><code>PUBLIC <var>name</var>,<var>expression</var></code></dt>
<dt><code>PUBLIC <var>name</var> <var>expression</var></code></dt>
<dd><p>Supply a value (<var>expression</var>) for external symbol
<var>name</var> used in the linker input files.
</p>
<a name="index-SECT-_0028MRI_0029"></a>
</dd>
<dt><code>SECT <var>secname</var>, <var>expression</var></code></dt>
<dt><code>SECT <var>secname</var>=<var>expression</var></code></dt>
<dt><code>SECT <var>secname</var> <var>expression</var></code></dt>
<dd><p>You can use any of these three forms of the <code>SECT</code> command to
specify the start address (<var>expression</var>) for section <var>secname</var>.
If you have more than one <code>SECT</code> statement for the same
<var>secname</var>, only the <em>first</em> sets the start address.
</p></dd>
</dl>

<hr>
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<p>
Next: <a href="GNU-Free-Documentation-License.html#GNU-Free-Documentation-License" accesskey="n" rel="next">GNU Free Documentation License</a>, Previous: <a href="Reporting-Bugs.html#Reporting-Bugs" accesskey="p" rel="prev">Reporting Bugs</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="LD-Index.html#LD-Index" title="Index" rel="index">Index</a>]</p>
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