95 lines
4.1 KiB
HTML
95 lines
4.1 KiB
HTML
|
<html lang="en">
|
||
|
|
<head>
|
||
|
|
<title>CR16 Operand Qualifiers - 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="CR16_002dDependent.html#CR16_002dDependent" title="CR16-Dependent">
|
||
|
|
<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="CR16-Operand-Qualifiers"></a>Up: <a rel="up" accesskey="u" href="CR16_002dDependent.html#CR16_002dDependent">CR16-Dependent</a>
|
||
|
|
<hr><br>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<h4 class="subsection">9.6.1 CR16 Operand Qualifiers</h4>
|
||
|
|
|
||
|
|
<p><a name="index-CR16-Operand-Qualifiers-667"></a>
|
||
|
|
The National Semiconductor CR16 target of <code>as</code> has a few machine dependent operand qualifiers.
|
||
|
|
|
||
|
|
<p>Operand expression type qualifier is an optional field in the instruction operand, to determines the type of the expression field of an operand. The <code>@</code> is required. CR16 architecture uses one of the following expression qualifiers:
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><code>s</code><dd>- <code>Specifies expression operand type as small</code>
|
||
|
|
<br><dt><code>m</code><dd>- <code>Specifies expression operand type as medium</code>
|
||
|
|
<br><dt><code>l</code><dd>- <code>Specifies expression operand type as large</code>
|
||
|
|
<br><dt><code>c</code><dd>- <code>Specifies the CR16 Assembler generates a relocation entry for the operand, where pc has implied bit, the expression is adjusted accordingly. The linker uses the relocation entry to update the operand address at link time.</code>
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<p>CR16 target operand qualifiers and its size (in bits):
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><span class="samp">Immediate Operand</span><dd>- s —– 4 bits
|
||
|
|
<br><dt><dd>- m —– 16 bits, for movb and movw instructions.
|
||
|
|
<br><dt><dd>- m —– 20 bits, movd instructions.
|
||
|
|
<br><dt><dd>- l —– 32 bits
|
||
|
|
|
||
|
|
<br><dt><span class="samp">Absolute Operand</span><dd>- s —– Illegal specifier for this operand.
|
||
|
|
<br><dt><dd>- m —– 20 bits, movd instructions.
|
||
|
|
|
||
|
|
<br><dt><span class="samp">Displacement Operand</span><dd>- s —– 8 bits
|
||
|
|
<br><dt><dd>- m —– 16 bits
|
||
|
|
<br><dt><dd>- l —– 24 bits
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<p>For example:
|
||
|
|
<pre class="example"> 1 <code>movw $_myfun@c,r1</code>
|
||
|
|
|
||
|
|
This loads the address of _myfun, shifted right by 1, into r1.
|
||
|
|
|
||
|
|
2 <code>movd $_myfun@c,(r2,r1)</code>
|
||
|
|
|
||
|
|
This loads the address of _myfun, shifted right by 1, into register-pair r2-r1.
|
||
|
|
|
||
|
|
3 <code>_myfun_ptr:</code>
|
||
|
|
<code>.long _myfun@c</code>
|
||
|
|
<code>loadd _myfun_ptr, (r1,r0)</code>
|
||
|
|
<code>jal (r1,r0)</code>
|
||
|
|
|
||
|
|
This .long directive, the address of _myfunc, shifted right by 1 at link time.
|
||
|
|
</pre>
|
||
|
|
<!-- Copyright 2002, 2004 Free Software Foundation, Inc. -->
|
||
|
|
<!-- This is part of the GAS manual. -->
|
||
|
|
<!-- For copying conditions, see the file as.texinfo. -->
|
||
|
|
<!-- CRIS description contributed by Axis Communications. -->
|
||
|
|
</body></html>
|
||
|
|
|