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101 lines
4.4 KiB
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101 lines
4.4 KiB
HTML
<!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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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>PDP-11-Syntax (Using as)</title>
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<meta name="description" content="PDP-11-Syntax (Using as)">
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<meta name="keywords" content="PDP-11-Syntax (Using as)">
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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="PDP_002d11_002dDependent.html#PDP_002d11_002dDependent" rel="up" title="PDP-11-Dependent">
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<link href="PDP_002d11_002dMnemonics.html#PDP_002d11_002dMnemonics" rel="next" title="PDP-11-Mnemonics">
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</head>
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<a name="PDP_002d11_002dSyntax"></a>
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<div class="header">
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<p>
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Next: <a href="PDP_002d11_002dMnemonics.html#PDP_002d11_002dMnemonics" accesskey="n" rel="next">PDP-11-Mnemonics</a>, Previous: <a href="PDP_002d11_002dPseudos.html#PDP_002d11_002dPseudos" accesskey="p" rel="prev">PDP-11-Pseudos</a>, Up: <a href="PDP_002d11_002dDependent.html#PDP_002d11_002dDependent" accesskey="u" rel="up">PDP-11-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="PDP_002d11-Assembly-Language-Syntax"></a>
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<h4 class="subsection">9.33.3 PDP-11 Assembly Language Syntax</h4>
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<a name="index-PDP_002d11-syntax"></a>
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<a name="index-DEC-syntax"></a>
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<a name="index-BSD-syntax"></a>
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<p><code>as</code> supports both DEC syntax and BSD syntax. The only
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difference is that in DEC syntax, a <code>#</code> character is used to denote
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an immediate constants, while in BSD syntax the character for this
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purpose is <code>$</code>.
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</p>
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<a name="index-PDP_002d11-general_002dpurpose-register-syntax"></a>
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<p>general-purpose registers are named <code>r0</code> through <code>r7</code>.
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Mnemonic alternatives for <code>r6</code> and <code>r7</code> are <code>sp</code> and
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<code>pc</code>, respectively.
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</p>
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<a name="index-PDP_002d11-floating_002dpoint-register-syntax"></a>
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<p>Floating-point registers are named <code>ac0</code> through <code>ac3</code>, or
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alternatively <code>fr0</code> through <code>fr3</code>.
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</p>
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<a name="index-PDP_002d11-comments"></a>
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<p>Comments are started with a <code>#</code> or a <code>/</code> character, and extend
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to the end of the line. (FIXME: clash with immediates?)
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</p>
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<a name="index-PDP_002d11-line-separator"></a>
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<p>Multiple statements on the same line can be separated by the ‘<samp>;</samp>’ character.
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</p>
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</body>
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</html>
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