81 lines
3.4 KiB
HTML
81 lines
3.4 KiB
HTML
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<html lang="en">
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<head>
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<title>HPPA Syntax - Using as</title>
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<meta name="description" content="Using as">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="HPPA_002dDependent.html#HPPA_002dDependent" title="HPPA-Dependent">
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<link rel="prev" href="HPPA-Options.html#HPPA-Options" title="HPPA Options">
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<link rel="next" href="HPPA-Floating-Point.html#HPPA-Floating-Point" title="HPPA Floating Point">
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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) 1991-2019 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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</head>
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<body>
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<div class="node">
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<a name="HPPA-Syntax"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="HPPA-Floating-Point.html#HPPA-Floating-Point">HPPA Floating Point</a>,
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Previous: <a rel="previous" accesskey="p" href="HPPA-Options.html#HPPA-Options">HPPA Options</a>,
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Up: <a rel="up" accesskey="u" href="HPPA_002dDependent.html#HPPA_002dDependent">HPPA-Dependent</a>
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<hr>
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</div>
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<h4 class="subsection">9.15.3 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>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>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><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>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>Special characters for HPPA targets include:
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<p>‘<samp><span class="samp">;</span></samp>’ is the line comment character.
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<p>‘<samp><span class="samp">!</span></samp>’ can be used instead of a newline to separate statements.
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<p>Since ‘<samp><span class="samp">$</span></samp>’ has no special meaning, you may use it in symbol names.
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</body></html>
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