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96 lines
4.1 KiB
HTML
96 lines
4.1 KiB
HTML
4 years ago
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<!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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-->
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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>Sparc-Aligned-Data (Using as)</title>
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<meta name="description" content="Sparc-Aligned-Data (Using as)">
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<meta name="keywords" content="Sparc-Aligned-Data (Using as)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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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="Sparc_002dDependent.html#Sparc_002dDependent" rel="up" title="Sparc-Dependent">
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<link href="Sparc_002dSyntax.html#Sparc_002dSyntax" rel="next" title="Sparc-Syntax">
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<link href="Sparc_002dOpts.html#Sparc_002dOpts" rel="prev" title="Sparc-Opts">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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div.example {margin-left: 3.2em}
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pre.format {font-family: inherit}
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span.nolinebreak {white-space: nowrap}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Sparc_002dAligned_002dData"></a>
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<div class="header">
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<p>
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Next: <a href="Sparc_002dSyntax.html#Sparc_002dSyntax" accesskey="n" rel="next">Sparc-Syntax</a>, Previous: <a href="Sparc_002dOpts.html#Sparc_002dOpts" accesskey="p" rel="prev">Sparc-Opts</a>, Up: <a href="Sparc_002dDependent.html#Sparc_002dDependent" accesskey="u" rel="up">Sparc-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="Enforcing-aligned-data"></a>
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<h4 class="subsection">9.43.2 Enforcing aligned data</h4>
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<a name="index-data-alignment-on-SPARC"></a>
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<a name="index-SPARC-data-alignment"></a>
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<p>SPARC GAS normally permits data to be misaligned. For example, it
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permits the <code>.long</code> pseudo-op to be used on a byte boundary.
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However, the native SunOS assemblers issue an error when they see
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misaligned data.
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</p>
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<a name="index-_002d_002denforce_002daligned_002ddata"></a>
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<p>You can use the <code>--enforce-aligned-data</code> option to make SPARC GAS
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also issue an error about misaligned data, just as the SunOS
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assemblers do.
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</p>
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<p>The <code>--enforce-aligned-data</code> option is not the default because gcc
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issues misaligned data pseudo-ops when it initializes certain packed
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data structures (structures defined using the <code>packed</code> attribute).
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You may have to assemble with GAS in order to initialize packed data
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structures in your own code.
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</p>
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<a name="index-SPARC-syntax"></a>
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<a name="index-syntax_002c-SPARC"></a>
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</body>
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</html>
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