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108 lines
4.5 KiB
HTML
108 lines
4.5 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This file documents the GNU Assembler "as".
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Copyright (C) 1991-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled "GNU Free Documentation License".
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>i386-Directives (Using as)</title>
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<meta name="description" content="i386-Directives (Using as)">
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<meta name="keywords" content="i386-Directives (Using as)">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="i386_002dDependent.html#i386_002dDependent" rel="up" title="i386-Dependent">
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<link href="i386_002dSyntax.html#i386_002dSyntax" rel="next" title="i386-Syntax">
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<link href="i386_002dOptions.html#i386_002dOptions" rel="prev" title="i386-Options">
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a.summary-letter {text-decoration: none}
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</head>
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<body lang="en">
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<a name="i386_002dDirectives"></a>
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<div class="header">
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<p>
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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="prev">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>
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</div>
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<hr>
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<a name="x86-specific-Directives"></a>
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<h4 class="subsection">9.15.2 x86 specific Directives</h4>
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<a name="index-machine-directives_002c-x86"></a>
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<a name="index-x86-machine-directives"></a>
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<dl compact="compact">
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<dd>
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<a name="index-lcomm-directive_002c-COFF"></a>
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</dd>
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<dt><code>.lcomm <var>symbol</var> , <var>length</var>[, <var>alignment</var>]</code></dt>
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<dd><p>Reserve <var>length</var> (an absolute expression) bytes for a local common
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denoted by <var>symbol</var>. The section and value of <var>symbol</var> are
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those of the new local common. The addresses are allocated in the bss
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section, so that at run-time the bytes start off zeroed. Since
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<var>symbol</var> is not declared global, it is normally not visible to
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<code>ld</code>. The optional third parameter, <var>alignment</var>,
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specifies the desired alignment of the symbol in the bss section.
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</p>
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<p>This directive is only available for COFF based x86 targets.
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</p>
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<a name="index-largecomm-directive_002c-ELF"></a>
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</dd>
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<dt><code>.largecomm <var>symbol</var> , <var>length</var>[, <var>alignment</var>]</code></dt>
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<dd><p>This directive behaves in the same way as the <code>comm</code> directive
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except that the data is placed into the <var>.lbss</var> section instead of
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the <var>.bss</var> section <a href="Comm.html#Comm">Comm</a>.
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</p>
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<p>The directive is intended to be used for data which requires a large
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amount of space, and it is only available for ELF based x86_64
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targets.
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</p>
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</dd>
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</dl>
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</body>
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</html>
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