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96 lines
4.2 KiB
HTML
96 lines
4.2 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>s390 Register (Using as)</title>
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<meta name="description" content="s390 Register (Using as)">
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<meta name="keywords" content="s390 Register (Using as)">
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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="s390-Syntax.html#s390-Syntax" rel="up" title="s390 Syntax">
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<link href="s390-Mnemonics.html#s390-Mnemonics" rel="next" title="s390 Mnemonics">
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<link href="s390-Syntax.html#s390-Syntax" rel="prev" title="s390 Syntax">
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</head>
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<body lang="en">
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<a name="s390-Register"></a>
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<div class="header">
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<p>
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Next: <a href="s390-Mnemonics.html#s390-Mnemonics" accesskey="n" rel="next">s390 Mnemonics</a>, Up: <a href="s390-Syntax.html#s390-Syntax" accesskey="u" rel="up">s390 Syntax</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="Register-naming"></a>
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<h4 class="subsubsection">9.40.3.1 Register naming</h4>
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<a name="index-register-naming_002c-s390"></a>
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<a name="index-s390-register-naming"></a>
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<p>The <code>as</code> recognizes a number of predefined symbols for the
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various processor registers. A register specification in one of the
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instruction formats is an unsigned integer between 0 and 15. The specific
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instruction and the position of the register in the instruction format
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denotes the type of the register. The register symbols are prefixed with
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‘<samp>%</samp>’:
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</p>
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<div class="display">
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<table>
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<tr><td><pre class="display">%rN</pre></td><td><pre class="display">the 16 general purpose registers, 0 <= N <= 15</pre></td></tr>
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<tr><td><pre class="display">%fN</pre></td><td><pre class="display">the 16 floating point registers, 0 <= N <= 15</pre></td></tr>
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<tr><td><pre class="display">%aN</pre></td><td><pre class="display">the 16 access registers, 0 <= N <= 15</pre></td></tr>
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<tr><td><pre class="display">%cN</pre></td><td><pre class="display">the 16 control registers, 0 <= N <= 15</pre></td></tr>
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<tr><td><pre class="display">%lit</pre></td><td><pre class="display">an alias for the general purpose register %r13</pre></td></tr>
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<tr><td><pre class="display">%sp</pre></td><td><pre class="display">an alias for the general purpose register %r15</pre></td></tr>
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</table>
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</div>
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</body>
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</html>
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