<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
<html>
|
<!-- This file documents the GNU Assembler "as".
|
|
Copyright (C) 1991-2021 Free Software Foundation, Inc.
|
|
Permission is granted to copy, distribute and/or modify this document
|
under the terms of the GNU Free Documentation License, Version 1.3
|
or any later version published by the Free Software Foundation;
|
with no Invariant Sections, with no Front-Cover Texts, and with no
|
Back-Cover Texts. A copy of the license is included in the
|
section entitled "GNU Free Documentation License".
|
-->
|
<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ -->
|
<head>
|
<title>Using as: i386-Directives</title>
|
|
<meta name="description" content="Using as: i386-Directives">
|
<meta name="keywords" content="Using as: i386-Directives">
|
<meta name="resource-type" content="document">
|
<meta name="distribution" content="global">
|
<meta name="Generator" content="makeinfo">
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
<link href="index.html#Top" rel="start" title="Top">
|
<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
<link href="i386_002dDependent.html#i386_002dDependent" rel="up" title="i386-Dependent">
|
<link href="i386_002dSyntax.html#i386_002dSyntax" rel="next" title="i386-Syntax">
|
<link href="i386_002dOptions.html#i386_002dOptions" rel="previous" title="i386-Options">
|
<style type="text/css">
|
<!--
|
a.summary-letter {text-decoration: none}
|
blockquote.smallquotation {font-size: smaller}
|
div.display {margin-left: 3.2em}
|
div.example {margin-left: 3.2em}
|
div.indentedblock {margin-left: 3.2em}
|
div.lisp {margin-left: 3.2em}
|
div.smalldisplay {margin-left: 3.2em}
|
div.smallexample {margin-left: 3.2em}
|
div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
|
div.smalllisp {margin-left: 3.2em}
|
kbd {font-style:oblique}
|
pre.display {font-family: inherit}
|
pre.format {font-family: inherit}
|
pre.menu-comment {font-family: serif}
|
pre.menu-preformatted {font-family: serif}
|
pre.smalldisplay {font-family: inherit; font-size: smaller}
|
pre.smallexample {font-size: smaller}
|
pre.smallformat {font-family: inherit; font-size: smaller}
|
pre.smalllisp {font-size: smaller}
|
span.nocodebreak {white-space:nowrap}
|
span.nolinebreak {white-space:nowrap}
|
span.roman {font-family:serif; font-weight:normal}
|
span.sansserif {font-family:sans-serif; font-weight:normal}
|
ul.no-bullet {list-style: none}
|
-->
|
</style>
|
|
|
</head>
|
|
<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
|
<a name="i386_002dDirectives"></a>
|
<div class="header">
|
<p>
|
Next: <a href="i386_002dSyntax.html#i386_002dSyntax" accesskey="n" rel="next">i386-Syntax</a>, Previous: <a href="i386_002dOptions.html#i386_002dOptions" accesskey="p" rel="previous">i386-Options</a>, Up: <a href="i386_002dDependent.html#i386_002dDependent" accesskey="u" rel="up">i386-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
|
</div>
|
<hr>
|
<a name="x86-specific-Directives"></a>
|
<h4 class="subsection">9.16.2 x86 specific Directives</h4>
|
|
<a name="index-machine-directives_002c-x86"></a>
|
<a name="index-x86-machine-directives"></a>
|
<dl compact="compact">
|
<dd>
|
<a name="index-lcomm-directive_002c-COFF"></a>
|
</dd>
|
<dt><code>.lcomm <var>symbol</var> , <var>length</var>[, <var>alignment</var>]</code></dt>
|
<dd><p>Reserve <var>length</var> (an absolute expression) bytes for a local common
|
denoted by <var>symbol</var>. The section and value of <var>symbol</var> are
|
those of the new local common. The addresses are allocated in the bss
|
section, so that at run-time the bytes start off zeroed. Since
|
<var>symbol</var> is not declared global, it is normally not visible to
|
<code>ld</code>. The optional third parameter, <var>alignment</var>,
|
specifies the desired alignment of the symbol in the bss section.
|
</p>
|
<p>This directive is only available for COFF based x86 targets.
|
</p>
|
<a name="index-largecomm-directive_002c-ELF"></a>
|
</dd>
|
<dt><code>.largecomm <var>symbol</var> , <var>length</var>[, <var>alignment</var>]</code></dt>
|
<dd><p>This directive behaves in the same way as the <code>comm</code> directive
|
except that the data is placed into the <var>.lbss</var> section instead of
|
the <var>.bss</var> section <a href="Comm.html#Comm">Comm</a>.
|
</p>
|
<p>The directive is intended to be used for data which requires a large
|
amount of space, and it is only available for ELF based x86_64
|
targets.
|
</p>
|
<a name="index-value-directive"></a>
|
</dd>
|
<dt><code>.value <var>expression</var> [, <var>expression</var>]</code></dt>
|
<dd><p>This directive behaves in the same way as the <code>.short</code> directive,
|
taking a series of comma separated expressions and storing them as
|
two-byte wide values into the current section.
|
</p>
|
|
</dd>
|
</dl>
|
|
|
|
|
</body>
|
</html>
|
