You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
102 lines
5.9 KiB
HTML
102 lines
5.9 KiB
HTML
15 years ago
|
<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 4.7">
|
||
|
|
<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, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
|
||
|
|
2006, 2007 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 1.1
|
||
|
|
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''.
|
||
|
|
|
||
|
|
man end-->
|
||
|
|
<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; }
|
||
|
|
--></style>
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
<div class="node">
|
||
|
|
<p>
|
||
|
|
<a name="M68K_002dSyntax"></a>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><br>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<h4 class="subsection">9.20.2 Syntax</h4>
|
||
|
|
|
||
|
|
<p><a name="index-_0040sc_007bmit_007d-1107"></a>This syntax for the Motorola 680x0 was developed at <span class="sc">mit</span>.
|
||
|
|
|
||
|
|
<p><a name="index-M680x0-syntax-1108"></a><a name="index-syntax_002c-M680x0-1109"></a><a name="index-M680x0-size-modifiers-1110"></a><a name="index-size-modifiers_002c-M680x0-1111"></a>The 680x0 version of <code>as</code> uses instructions names and
|
||
|
|
syntax compatible with the Sun assembler. Intervening periods are
|
||
|
|
ignored; for example, <span class="samp">movl</span> is equivalent to <span class="samp">mov.l</span>.
|
||
|
|
|
||
|
|
<p>In the following table <var>apc</var> stands for any of the address registers
|
||
|
|
(<span class="samp">%a0</span> through <span class="samp">%a7</span>), the program counter (<span class="samp">%pc</span>), the
|
||
|
|
zero-address relative to the program counter (<span class="samp">%zpc</span>), a suppressed
|
||
|
|
address register (<span class="samp">%za0</span> through <span class="samp">%za7</span>), or it may be omitted
|
||
|
|
entirely. The use of <var>size</var> means one of <span class="samp">w</span> or <span class="samp">l</span>, 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 <span class="samp">1</span>, <span class="samp">2</span>,
|
||
|
|
<span class="samp">4</span>, or <span class="samp">8</span>, and it may always be omitted along with the
|
||
|
|
leading colon.
|
||
|
|
|
||
|
|
<p><a name="index-M680x0-addressing-modes-1112"></a><a name="index-addressing-modes_002c-M680x0-1113"></a>The following addressing modes are understood:
|
||
|
|
<dl>
|
||
|
|
<dt><dfn>Immediate</dfn><dd><span class="samp">#</span><var>number</var>
|
||
|
|
|
||
|
|
<br><dt><dfn>Data Register</dfn><dd><span class="samp">%d0</span> through <span class="samp">%d7</span>
|
||
|
|
|
||
|
|
<br><dt><dfn>Address Register</dfn><dd><span class="samp">%a0</span> through <span class="samp">%a7</span><br>
|
||
|
|
<span class="samp">%a7</span> is also known as <span class="samp">%sp</span>, i.e., the Stack Pointer. <code>%a6</code>
|
||
|
|
is also known as <span class="samp">%fp</span>, the Frame Pointer.
|
||
|
|
|
||
|
|
<br><dt><dfn>Address Register Indirect</dfn><dd><span class="samp">%a0@</span> through <span class="samp">%a7@</span>
|
||
|
|
|
||
|
|
<br><dt><dfn>Address Register Postincrement</dfn><dd><span class="samp">%a0@+</span> through <span class="samp">%a7@+</span>
|
||
|
|
|
||
|
|
<br><dt><dfn>Address Register Predecrement</dfn><dd><span class="samp">%a0@-</span> through <span class="samp">%a7@-</span>
|
||
|
|
|
||
|
|
<br><dt><dfn>Indirect Plus Offset</dfn><dd><var>apc</var><span class="samp">@(</span><var>number</var><span class="samp">)</span>
|
||
|
|
|
||
|
|
<br><dt><dfn>Index</dfn><dd><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>
|
||
|
|
|
||
|
|
<p>The <var>number</var> may be omitted.
|
||
|
|
|
||
|
|
<br><dt><dfn>Postindex</dfn><dd><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>
|
||
|
|
|
||
|
|
<p>The <var>onumber</var> or the <var>register</var>, but not both, may be omitted.
|
||
|
|
|
||
|
|
<br><dt><dfn>Preindex</dfn><dd><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>
|
||
|
|
|
||
|
|
<p>The <var>number</var> may be omitted. Omitting the <var>register</var> produces
|
||
|
|
the Postindex addressing mode.
|
||
|
|
|
||
|
|
<br><dt><dfn>Absolute</dfn><dd><var>symbol</var>, or <var>digits</var>, optionally followed by
|
||
|
|
<span class="samp">:b</span>, <span class="samp">:w</span>, or <span class="samp">:l</span>.
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
</body></html>
|
||
|
|
|