105 lines
4.5 KiB
HTML
105 lines
4.5 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: HPPA Syntax</title>
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<meta name="description" content="Using as: HPPA Syntax">
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<meta name="keywords" content="Using as: HPPA Syntax">
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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="HPPA_002dDependent.html#HPPA_002dDependent" rel="up" title="HPPA-Dependent">
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<link href="HPPA-Floating-Point.html#HPPA-Floating-Point" rel="next" title="HPPA Floating Point">
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<link href="HPPA-Options.html#HPPA-Options" rel="prev" title="HPPA Options">
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<style type="text/css">
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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="HPPA-Syntax"></a>
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<div class="header">
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<p>
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Next: <a href="HPPA-Floating-Point.html#HPPA-Floating-Point" accesskey="n" rel="next">HPPA Floating Point</a>, Previous: <a href="HPPA-Options.html#HPPA-Options" accesskey="p" rel="prev">HPPA Options</a>, Up: <a href="HPPA_002dDependent.html#HPPA_002dDependent" accesskey="u" rel="up">HPPA-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="Syntax-12"></a>
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<h4 class="subsection">9.13.3 Syntax</h4>
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<p>The assembler syntax closely follows the HPPA instruction set
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reference manual; assembler directives and general syntax closely follow the
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HPPA assembly language reference manual, with a few noteworthy differences.
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</p>
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<p>First, a colon may immediately follow a label definition. This is
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simply for compatibility with how most assembly language programmers
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write code.
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</p>
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<p>Some obscure expression parsing problems may affect hand written code which
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uses the <code>spop</code> instructions, or code which makes significant
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use of the <code>!</code> line separator.
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</p>
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<p><code>as</code> is much less forgiving about missing arguments and other
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similar oversights than the HP assembler. <code>as</code> notifies you
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of missing arguments as syntax errors; this is regarded as a feature, not a
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bug.
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</p>
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<p>Finally, <code>as</code> allows you to use an external symbol without
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explicitly importing the symbol. <em>Warning:</em> in the future this will be
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an error for HPPA targets.
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</p>
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<p>Special characters for HPPA targets include:
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</p>
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<p>‘<samp>;</samp>’ is the line comment character.
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</p>
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<p>‘<samp>!</samp>’ can be used instead of a newline to separate statements.
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</p>
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<p>Since ‘<samp>$</samp>’ has no special meaning, you may use it in symbol names.
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</p>
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</body>
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</html>
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