104 lines
6.9 KiB
HTML
104 lines
6.9 KiB
HTML
|
<html lang="en">
|
||
|
|
<head>
|
||
|
|
<title>M68K-Syntax - Using as</title>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html">
|
||
|
|
<meta name="description" content="Using as">
|
||
|
|
<meta name="generator" content="makeinfo 4.13">
|
||
|
|
<link title="Top" rel="start" href="index.html#Top">
|
||
|
|
<link rel="up" href="M68K_002dDependent.html#M68K_002dDependent" title="M68K-Dependent">
|
||
|
|
<link rel="prev" href="M68K_002dOpts.html#M68K_002dOpts" title="M68K-Opts">
|
||
|
|
<link rel="next" href="M68K_002dMoto_002dSyntax.html#M68K_002dMoto_002dSyntax" title="M68K-Moto-Syntax">
|
||
|
|
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
|
||
|
|
<!--
|
||
|
|
This file documents the GNU Assembler "as".
|
||
|
|
|
||
|
|
Copyright (C) 1991-2019 Free Software Foundation, Inc.
|
||
|
|
|
||
|
|
Permission is granted to copy, distribute and/or modify this document
|
||
|
|
under the terms of the GNU Free Documentation License, Version 1.3
|
||
|
|
or any later version published by the Free Software Foundation;
|
||
|
|
with no Invariant Sections, with no Front-Cover Texts, and with no
|
||
|
|
Back-Cover Texts. A copy of the license is included in the
|
||
|
|
section entitled ``GNU Free Documentation License''.
|
||
|
|
|
||
|
|
-->
|
||
|
|
<meta http-equiv="Content-Style-Type" content="text/css">
|
||
|
|
<style type="text/css"><!--
|
||
|
|
pre.display { font-family:inherit }
|
||
|
|
pre.format { font-family:inherit }
|
||
|
|
pre.smalldisplay { font-family:inherit; font-size:smaller }
|
||
|
|
pre.smallformat { font-family:inherit; font-size:smaller }
|
||
|
|
pre.smallexample { font-size:smaller }
|
||
|
|
pre.smalllisp { font-size:smaller }
|
||
|
|
span.sc { font-variant:small-caps }
|
||
|
|
span.roman { font-family:serif; font-weight:normal; }
|
||
|
|
span.sansserif { font-family:sans-serif; font-weight:normal; }
|
||
|
|
--></style>
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
<div class="node">
|
||
|
|
<a name="M68K-Syntax"></a>
|
||
|
|
<a name="M68K_002dSyntax"></a>
|
||
|
|
<p>
|
||
|
|
Next: <a rel="next" accesskey="n" href="M68K_002dMoto_002dSyntax.html#M68K_002dMoto_002dSyntax">M68K-Moto-Syntax</a>,
|
||
|
|
Previous: <a rel="previous" accesskey="p" href="M68K_002dOpts.html#M68K_002dOpts">M68K-Opts</a>,
|
||
|
|
Up: <a rel="up" accesskey="u" href="M68K_002dDependent.html#M68K_002dDependent">M68K-Dependent</a>
|
||
|
|
<hr>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<h4 class="subsection">9.22.2 Syntax</h4>
|
||
|
|
|
||
|
|
<p><a name="index-g_t_0040sc_007bmit_007d-1420"></a>This syntax for the Motorola 680x0 was developed at <span class="sc">mit</span>.
|
||
|
|
|
||
|
|
<p><a name="index-M680x0-syntax-1421"></a><a name="index-syntax_002c-M680x0-1422"></a><a name="index-M680x0-size-modifiers-1423"></a><a name="index-size-modifiers_002c-M680x0-1424"></a>The 680x0 version of <code>as</code> uses instructions names and
|
||
|
|
syntax compatible with the Sun assembler. Intervening periods are
|
||
|
|
ignored; for example, ‘<samp><span class="samp">movl</span></samp>’ is equivalent to ‘<samp><span class="samp">mov.l</span></samp>’.
|
||
|
|
|
||
|
|
<p>In the following table <var>apc</var> stands for any of the address registers
|
||
|
|
(‘<samp><span class="samp">%a0</span></samp>’ through ‘<samp><span class="samp">%a7</span></samp>’), the program counter (‘<samp><span class="samp">%pc</span></samp>’), the
|
||
|
|
zero-address relative to the program counter (‘<samp><span class="samp">%zpc</span></samp>’), a suppressed
|
||
|
|
address register (‘<samp><span class="samp">%za0</span></samp>’ through ‘<samp><span class="samp">%za7</span></samp>’), or it may be omitted
|
||
|
|
entirely. The use of <var>size</var> means one of ‘<samp><span class="samp">w</span></samp>’ or ‘<samp><span class="samp">l</span></samp>’, and
|
||
|
|
it may be omitted, along with the leading colon, unless a scale is also
|
||
|
|
specified. The use of <var>scale</var> means one of ‘<samp><span class="samp">1</span></samp>’, ‘<samp><span class="samp">2</span></samp>’,
|
||
|
|
‘<samp><span class="samp">4</span></samp>’, or ‘<samp><span class="samp">8</span></samp>’, and it may always be omitted along with the
|
||
|
|
leading colon.
|
||
|
|
|
||
|
|
<p><a name="index-M680x0-addressing-modes-1425"></a><a name="index-addressing-modes_002c-M680x0-1426"></a>The following addressing modes are understood:
|
||
|
|
<dl>
|
||
|
|
<dt><dfn>Immediate</dfn><dd>‘<samp><span class="samp">#</span><var>number</var></samp>’
|
||
|
|
|
||
|
|
<br><dt><dfn>Data Register</dfn><dd>‘<samp><span class="samp">%d0</span></samp>’ through ‘<samp><span class="samp">%d7</span></samp>’
|
||
|
|
|
||
|
|
<br><dt><dfn>Address Register</dfn><dd>‘<samp><span class="samp">%a0</span></samp>’ through ‘<samp><span class="samp">%a7</span></samp>’<br>
|
||
|
|
‘<samp><span class="samp">%a7</span></samp>’ is also known as ‘<samp><span class="samp">%sp</span></samp>’, i.e., the Stack Pointer. <code>%a6</code>
|
||
|
|
is also known as ‘<samp><span class="samp">%fp</span></samp>’, the Frame Pointer.
|
||
|
|
|
||
|
|
<br><dt><dfn>Address Register Indirect</dfn><dd>‘<samp><span class="samp">%a0@</span></samp>’ through ‘<samp><span class="samp">%a7@</span></samp>’
|
||
|
|
|
||
|
|
<br><dt><dfn>Address Register Postincrement</dfn><dd>‘<samp><span class="samp">%a0@+</span></samp>’ through ‘<samp><span class="samp">%a7@+</span></samp>’
|
||
|
|
|
||
|
|
<br><dt><dfn>Address Register Predecrement</dfn><dd>‘<samp><span class="samp">%a0@-</span></samp>’ through ‘<samp><span class="samp">%a7@-</span></samp>’
|
||
|
|
|
||
|
|
<br><dt><dfn>Indirect Plus Offset</dfn><dd>‘<samp><var>apc</var><span class="samp">@(</span><var>number</var><span class="samp">)</span></samp>’
|
||
|
|
|
||
|
|
<br><dt><dfn>Index</dfn><dd>‘<samp><var>apc</var><span class="samp">@(</span><var>number</var><span class="samp">,</span><var>register</var><span class="samp">:</span><var>size</var><span class="samp">:</span><var>scale</var><span class="samp">)</span></samp>’
|
||
|
|
|
||
|
|
<p>The <var>number</var> may be omitted.
|
||
|
|
|
||
|
|
<br><dt><dfn>Postindex</dfn><dd>‘<samp><var>apc</var><span class="samp">@(</span><var>number</var><span class="samp">)@(</span><var>onumber</var><span class="samp">,</span><var>register</var><span class="samp">:</span><var>size</var><span class="samp">:</span><var>scale</var><span class="samp">)</span></samp>’
|
||
|
|
|
||
|
|
<p>The <var>onumber</var> or the <var>register</var>, but not both, may be omitted.
|
||
|
|
|
||
|
|
<br><dt><dfn>Preindex</dfn><dd>‘<samp><var>apc</var><span class="samp">@(</span><var>number</var><span class="samp">,</span><var>register</var><span class="samp">:</span><var>size</var><span class="samp">:</span><var>scale</var><span class="samp">)@(</span><var>onumber</var><span class="samp">)</span></samp>’
|
||
|
|
|
||
|
|
<p>The <var>number</var> may be omitted. Omitting the <var>register</var> produces
|
||
|
|
the Postindex addressing mode.
|
||
|
|
|
||
|
|
<br><dt><dfn>Absolute</dfn><dd>‘<samp><var>symbol</var></samp>’, or ‘<samp><var>digits</var></samp>’, optionally followed by
|
||
|
|
‘<samp><span class="samp">:b</span></samp>’, ‘<samp><span class="samp">:w</span></samp>’, or ‘<samp><span class="samp">:l</span></samp>’.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
</body></html>
|
||
|
|
|