74 lines
3.6 KiB
HTML
74 lines
3.6 KiB
HTML
<html lang="en">
|
|
<head>
|
|
<title>VAX-operands - 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="Vax_002dDependent.html#Vax_002dDependent" title="Vax-Dependent">
|
|
<link rel="prev" href="VAX_002dbranch.html#VAX_002dbranch" title="VAX-branch">
|
|
<link rel="next" href="VAX_002dno.html#VAX_002dno" title="VAX-no">
|
|
<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="VAX_002doperands"></a>Next: <a rel="next" accesskey="n" href="VAX_002dno.html#VAX_002dno">VAX-no</a>,
|
|
Previous: <a rel="previous" accesskey="p" href="VAX_002dbranch.html#VAX_002dbranch">VAX-branch</a>,
|
|
Up: <a rel="up" accesskey="u" href="Vax_002dDependent.html#Vax_002dDependent">Vax-Dependent</a>
|
|
<hr><br>
|
|
</div>
|
|
|
|
<h4 class="subsection">9.34.6 VAX Operands</h4>
|
|
|
|
<p><a name="index-VAX-operand-notation-1770"></a><a name="index-operand-notation_002c-VAX-1771"></a><a name="index-immediate-character_002c-VAX-1772"></a><a name="index-VAX-immediate-character-1773"></a>The immediate character is <span class="samp">$</span> for Unix compatibility, not
|
|
<span class="samp">#</span> as DEC writes it.
|
|
|
|
<p><a name="index-indirect-character_002c-VAX-1774"></a><a name="index-VAX-indirect-character-1775"></a>The indirect character is <span class="samp">*</span> for Unix compatibility, not
|
|
<span class="samp">@</span> as DEC writes it.
|
|
|
|
<p><a name="index-displacement-sizing-character_002c-VAX-1776"></a><a name="index-VAX-displacement-sizing-character-1777"></a>The displacement sizing character is <span class="samp">`</span> (an accent grave) for
|
|
Unix compatibility, not <span class="samp">^</span> as DEC writes it. The letter
|
|
preceding <span class="samp">`</span> may have either case. <span class="samp">G</span> is not
|
|
understood, but all other letters (<code>b i l s w</code>) are understood.
|
|
|
|
<p><a name="index-register-names_002c-VAX-1778"></a><a name="index-VAX-register-names-1779"></a>Register names understood are <code>r0 r1 r2 ... r15 ap fp sp
|
|
pc</code>. Upper and lower case letters are equivalent.
|
|
|
|
<p>For instance
|
|
<pre class="smallexample"> tstb *w`$4(r5)
|
|
</pre>
|
|
<p>Any expression is permitted in an operand. Operands are comma
|
|
separated.
|
|
|
|
<!-- There is some bug to do with recognizing expressions -->
|
|
<!-- in operands, but I forget what it is. It is -->
|
|
<!-- a syntax clash because () is used as an address mode -->
|
|
<!-- and to encapsulate sub-expressions. -->
|
|
</body></html>
|
|
|