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91 lines
4.3 KiB
HTML
91 lines
4.3 KiB
HTML
4 years ago
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<html lang="en">
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<head>
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<title>ARC Directives - Using as</title>
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<meta name="description" content="Using as">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="ARC_002dDependent.html#ARC_002dDependent" title="ARC-Dependent">
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<link rel="prev" href="ARC-Syntax.html#ARC-Syntax" title="ARC Syntax">
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<link rel="next" href="ARC-Modifiers.html#ARC-Modifiers" title="ARC Modifiers">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991-2015 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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</head>
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<body>
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<div class="node">
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<a name="ARC-Directives"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="ARC-Modifiers.html#ARC-Modifiers">ARC Modifiers</a>,
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Previous: <a rel="previous" accesskey="p" href="ARC-Syntax.html#ARC-Syntax">ARC Syntax</a>,
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Up: <a rel="up" accesskey="u" href="ARC_002dDependent.html#ARC_002dDependent">ARC-Dependent</a>
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<hr>
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</div>
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<h4 class="subsection">9.3.3 ARC Machine Directives</h4>
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<p><a name="index-machine-directives_002c-ARC-672"></a><a name="index-ARC-machine-directives-673"></a>The ARC version of <code>as</code> supports the following additional
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machine directives:
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<a name="index-g_t_0040code_007blcomm_007d-directive-674"></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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specified as a byte boundary (for example, an alignment of 16 means
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that the least significant 4 bits of the address should be zero). The
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alignment must be an absolute expression, and it must be a power of
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two. If no alignment is specified, as will set the alignment to the
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largest power of two less than or equal to the size of the symbol, up
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to a maximum of 16.
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<p><a name="index-g_t_0040code_007blcommon_007d-directive-675"></a><br><dt><code>.lcommon </code><var>symbol</var><code> , </code><var>length</var><code>[, </code><var>alignment</var><code>]</code><dd>The same as <code>lcomm</code> directive.
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<p><a name="index-g_t_0040code_007bcpu_007d-directive_002c-ARC-676"></a><a name="index-g_t_0040code_007bcpu_007d-directive_002c-ARC-677"></a>The <code>.cpu</code> directive must be followed by the desired core
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version. Permitted values for CPU are:
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<dl>
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<dt><code>ARC600</code><dd>Assemble for the ARC600 instruction set.
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<br><dt><code>ARC700</code><dd>Assemble for the ARC700 instruction set.
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<br><dt><code>EM</code><dd>Assemble for the ARC EM instruction set.
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<br><dt><code>HS</code><dd>Assemble for the ARC HS instruction set.
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</dl>
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<p>Note: the <code>.cpu</code> directive overrides the command line option
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<code>-mcpu=</code><var>cpu</var>; a warning is emitted when the version is not
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consistent between the two.
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</dl>
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</body></html>
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