81 lines
4.0 KiB
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81 lines
4.0 KiB
HTML
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<title>i386-Directives - Using as</title>
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<!--
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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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<a name="i386-Directives"></a>
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<a name="i386_002dDirectives"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="i386_002dSyntax.html#i386_002dSyntax">i386-Syntax</a>,
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Previous: <a rel="previous" accesskey="p" href="i386_002dOptions.html#i386_002dOptions">i386-Options</a>,
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Up: <a rel="up" accesskey="u" href="i386_002dDependent.html#i386_002dDependent">i386-Dependent</a>
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</div>
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<h4 class="subsection">9.16.2 x86 specific Directives</h4>
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<p><a name="index-machine-directives_002c-x86-1137"></a><a name="index-x86-machine-directives-1138"></a>
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<a name="index-g_t_0040code_007blcomm_007d-directive_002c-COFF-1139"></a>
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<dl><dt><code>.lcomm </code><var>symbol</var><code> , </code><var>length</var><code>[, </code><var>alignment</var><code>]</code><dd>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>This directive is only available for COFF based x86 targets.
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<p><a name="index-g_t_0040code_007blargecomm_007d-directive_002c-ELF-1140"></a><br><dt><code>.largecomm </code><var>symbol</var><code> , </code><var>length</var><code>[, </code><var>alignment</var><code>]</code><dd>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>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><a name="index-g_t_0040code_007bvalue_007d-directive-1141"></a><br><dt><code>.value </code><var>expression</var><code> [, </code><var>expression</var><code>]</code><dd>This directive behaves in the same way as the <code>.short</code> directive,
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taking a series of comma separated expressions and storing them as
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two-byte wide values into the current section.
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<!-- FIXME: Document other x86 specific directives ? Eg: .code16gcc, -->
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</dl>
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</body></html>
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