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150 lines
5.6 KiB
HTML
150 lines
5.6 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This file documents the GNU Assembler "as".
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Copyright (C) 1991-2019 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 1.3
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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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-->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>M32C-Modifiers (Using as)</title>
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<meta name="description" content="M32C-Modifiers (Using as)">
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<meta name="keywords" content="M32C-Modifiers (Using as)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="M32C_002dSyntax.html#M32C_002dSyntax" rel="up" title="M32C-Syntax">
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<link href="M32C_002dChars.html#M32C_002dChars" rel="next" title="M32C-Chars">
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<link href="M32C_002dSyntax.html#M32C_002dSyntax" rel="prev" title="M32C-Syntax">
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="M32C_002dModifiers"></a>
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<div class="header">
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<p>
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Next: <a href="M32C_002dChars.html#M32C_002dChars" accesskey="n" rel="next">M32C-Chars</a>, Up: <a href="M32C_002dSyntax.html#M32C_002dSyntax" accesskey="u" rel="up">M32C-Syntax</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Symbolic-Operand-Modifiers"></a>
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<h4 class="subsubsection">9.19.2.1 Symbolic Operand Modifiers</h4>
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<a name="index-M32C-modifiers"></a>
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<a name="index-modifiers_002c-M32C"></a>
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<p>The assembler supports several modifiers when using symbol addresses
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in M32C instruction operands. The general syntax is the following:
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</p>
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<div class="smallexample">
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<pre class="smallexample">%modifier(symbol)
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</pre></div>
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<dl compact="compact">
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<dd><a name="index-symbol-modifiers-2"></a>
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</dd>
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<dt><code>%dsp8</code></dt>
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<dt><code>%dsp16</code></dt>
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<dd>
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<p>These modifiers override the assembler’s assumptions about how big a
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symbol’s address is. Normally, when it sees an operand like
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‘<samp>sym[a0]</samp>’ it assumes ‘<samp>sym</samp>’ may require the widest
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displacement field (16 bits for ‘<samp>-m16c</samp>’, 24 bits for
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‘<samp>-m32c</samp>’). These modifiers tell it to assume the address will fit
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in an 8 or 16 bit (respectively) unsigned displacement. Note that, of
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course, if it doesn’t actually fit you will get linker errors. Example:
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</p>
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<div class="smallexample">
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<pre class="smallexample">mov.w %dsp8(sym)[a0],r1
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mov.b #0,%dsp8(sym)[a0]
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</pre></div>
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</dd>
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<dt><code>%hi8</code></dt>
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<dd>
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<p>This modifier allows you to load bits 16 through 23 of a 24 bit
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address into an 8 bit register. This is useful with, for example, the
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M16C ‘<samp>smovf</samp>’ instruction, which expects a 20 bit address in
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‘<samp>r1h</samp>’ and ‘<samp>a0</samp>’. Example:
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</p>
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<div class="smallexample">
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<pre class="smallexample">mov.b #%hi8(sym),r1h
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mov.w #%lo16(sym),a0
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smovf.b
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</pre></div>
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</dd>
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<dt><code>%lo16</code></dt>
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<dd>
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<p>Likewise, this modifier allows you to load bits 0 through 15 of a 24
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bit address into a 16 bit register.
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</p>
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</dd>
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<dt><code>%hi16</code></dt>
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<dd>
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<p>This modifier allows you to load bits 16 through 31 of a 32 bit
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address into a 16 bit register. While the M32C family only has 24
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bits of address space, it does support addresses in pairs of 16 bit
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registers (like ‘<samp>a1a0</samp>’ for the ‘<samp>lde</samp>’ instruction). This
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modifier is for loading the upper half in such cases. Example:
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</p>
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<div class="smallexample">
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<pre class="smallexample">mov.w #%hi16(sym),a1
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mov.w #%lo16(sym),a0
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…
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lde.w [a1a0],r1
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</pre></div>
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</dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="M32C_002dChars.html#M32C_002dChars" accesskey="n" rel="next">M32C-Chars</a>, Up: <a href="M32C_002dSyntax.html#M32C_002dSyntax" accesskey="u" rel="up">M32C-Syntax</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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