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95 lines
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95 lines
4.1 KiB
HTML
15 years ago
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<title>CR16 Operand Qualifiers - Using as</title>
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<meta name="description" content="Using as">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="CR16_002dDependent.html#CR16_002dDependent" title="CR16-Dependent">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
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2006, 2007 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 1.1
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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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Back-Cover Texts. A copy of the license is included in the
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section entitled ``GNU Free Documentation License''.
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<div class="node">
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<p>
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<a name="CR16-Operand-Qualifiers"></a>Up: <a rel="up" accesskey="u" href="CR16_002dDependent.html#CR16_002dDependent">CR16-Dependent</a>
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<hr><br>
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</div>
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<h4 class="subsection">9.6.1 CR16 Operand Qualifiers</h4>
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<p><a name="index-CR16-Operand-Qualifiers-667"></a>
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The National Semiconductor CR16 target of <code>as</code> has a few machine dependent operand qualifiers.
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<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:
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<dl>
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<dt><code>s</code><dd>- <code>Specifies expression operand type as small</code>
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<br><dt><code>m</code><dd>- <code>Specifies expression operand type as medium</code>
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<br><dt><code>l</code><dd>- <code>Specifies expression operand type as large</code>
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<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>
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</dl>
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<p>CR16 target operand qualifiers and its size (in bits):
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<dl>
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<dt><span class="samp">Immediate Operand</span><dd>- s —– 4 bits
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<br><dt><dd>- m —– 16 bits, for movb and movw instructions.
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<br><dt><dd>- m —– 20 bits, movd instructions.
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<br><dt><dd>- l —– 32 bits
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<br><dt><span class="samp">Absolute Operand</span><dd>- s —– Illegal specifier for this operand.
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<br><dt><dd>- m —– 20 bits, movd instructions.
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<br><dt><span class="samp">Displacement Operand</span><dd>- s —– 8 bits
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<br><dt><dd>- m —– 16 bits
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<br><dt><dd>- l —– 24 bits
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</dl>
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<p>For example:
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<pre class="example"> 1 <code>movw $_myfun@c,r1</code>
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This loads the address of _myfun, shifted right by 1, into r1.
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2 <code>movd $_myfun@c,(r2,r1)</code>
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This loads the address of _myfun, shifted right by 1, into register-pair r2-r1.
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3 <code>_myfun_ptr:</code>
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<code>.long _myfun@c</code>
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<code>loadd _myfun_ptr, (r1,r0)</code>
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<code>jal (r1,r0)</code>
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This .long directive, the address of _myfunc, shifted right by 1 at link time.
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</pre>
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<!-- Copyright 2002, 2004 Free Software Foundation, Inc. -->
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<!-- This is part of the GAS manual. -->
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<!-- For copying conditions, see the file as.texinfo. -->
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<!-- CRIS description contributed by Axis Communications. -->
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</body></html>
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