115 lines
5.6 KiB
HTML
115 lines
5.6 KiB
HTML
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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) 1991-2016 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 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Using as: Balign</title>
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<meta name="description" content="Using as: Balign">
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<meta name="keywords" content="Using as: Balign">
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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="Pseudo-Ops.html#Pseudo-Ops" rel="up" title="Pseudo Ops">
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<link href="Bundle-directives.html#Bundle-directives" rel="next" title="Bundle directives">
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<link href="Asciz.html#Asciz" rel="prev" title="Asciz">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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div.indentedblock {margin-left: 3.2em}
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div.lisp {margin-left: 3.2em}
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div.smalldisplay {margin-left: 3.2em}
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div.smallexample {margin-left: 3.2em}
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div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
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div.smalllisp {margin-left: 3.2em}
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kbd {font-style:oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.menu-preformatted {font-family: serif}
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pre.smalldisplay {font-family: inherit; font-size: smaller}
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pre.smallexample {font-size: smaller}
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pre.smallformat {font-family: inherit; font-size: smaller}
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pre.smalllisp {font-size: smaller}
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span.nocodebreak {white-space:nowrap}
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span.nolinebreak {white-space:nowrap}
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span.roman {font-family:serif; 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" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="Balign"></a>
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<div class="header">
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<p>
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Next: <a href="Bundle-directives.html#Bundle-directives" accesskey="n" rel="next">Bundle directives</a>, Previous: <a href="Asciz.html#Asciz" accesskey="p" rel="prev">Asciz</a>, Up: <a href="Pseudo-Ops.html#Pseudo-Ops" accesskey="u" rel="up">Pseudo Ops</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="g_t_002ebalign_005bwl_005d-abs_002dexpr_002c-abs_002dexpr_002c-abs_002dexpr"></a>
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<h3 class="section">7.7 <code>.balign[wl] <var>abs-expr</var>, <var>abs-expr</var>, <var>abs-expr</var></code></h3>
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<a name="index-padding-the-location-counter-given-number-of-bytes"></a>
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<a name="index-balign-directive"></a>
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<p>Pad the location counter (in the current subsection) to a particular
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storage boundary. The first expression (which must be absolute) is the
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alignment request in bytes. For example ‘<samp>.balign 8</samp>’ advances
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the location counter until it is a multiple of 8. If the location counter
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is already a multiple of 8, no change is needed.
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</p>
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<p>The second expression (also absolute) gives the fill value to be stored in the
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padding bytes. It (and the comma) may be omitted. If it is omitted, the
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padding bytes are normally zero. However, on some systems, if the section is
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marked as containing code and the fill value is omitted, the space is filled
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with no-op instructions.
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</p>
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<p>The third expression is also absolute, and is also optional. If it is present,
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it is the maximum number of bytes that should be skipped by this alignment
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directive. If doing the alignment would require skipping more bytes than the
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specified maximum, then the alignment is not done at all. You can omit the
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fill value (the second argument) entirely by simply using two commas after the
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required alignment; this can be useful if you want the alignment to be filled
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with no-op instructions when appropriate.
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</p>
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<a name="index-balignw-directive"></a>
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<a name="index-balignl-directive"></a>
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<p>The <code>.balignw</code> and <code>.balignl</code> directives are variants of the
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<code>.balign</code> directive. The <code>.balignw</code> directive treats the fill
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pattern as a two byte word value. The <code>.balignl</code> directives treats the
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fill pattern as a four byte longword value. For example, <code>.balignw
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4,0x368d</code> will align to a multiple of 4. If it skips two bytes, they will be
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filled in with the value 0x368d (the exact placement of the bytes depends upon
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the endianness of the processor). If it skips 1 or 3 bytes, the fill value is
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undefined.
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</p>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Bundle-directives.html#Bundle-directives" accesskey="n" rel="next">Bundle directives</a>, Previous: <a href="Asciz.html#Asciz" accesskey="p" rel="prev">Asciz</a>, Up: <a href="Pseudo-Ops.html#Pseudo-Ops" accesskey="u" rel="up">Pseudo Ops</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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</body>
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</html>
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