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131 lines
5.4 KiB
HTML
131 lines
5.4 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>Z80 Directives (Using as)</title>
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<meta name="description" content="Z80 Directives (Using as)">
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<meta name="keywords" content="Z80 Directives (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="Z80_002dDependent.html#Z80_002dDependent" rel="up" title="Z80-Dependent">
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<link href="Z80-Opcodes.html#Z80-Opcodes" rel="next" title="Z80 Opcodes">
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<link href="Z80-Floating-Point.html#Z80-Floating-Point" rel="prev" title="Z80 Floating Point">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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pre.display {font-family: inherit}
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span.roman {font-family: initial; font-weight: normal}
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span.sansserif {font-family: sans-serif; font-weight: normal}
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ul.no-bullet {list-style: none}
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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="Z80-Directives"></a>
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<div class="header">
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<p>
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Next: <a href="Z80-Opcodes.html#Z80-Opcodes" accesskey="n" rel="next">Z80 Opcodes</a>, Previous: <a href="Z80-Floating-Point.html#Z80-Floating-Point" accesskey="p" rel="prev">Z80 Floating Point</a>, Up: <a href="Z80_002dDependent.html#Z80_002dDependent" accesskey="u" rel="up">Z80-Dependent</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="Z80-Assembler-Directives"></a>
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<h4 class="subsection">9.55.4 Z80 Assembler Directives</h4>
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<p><code>as</code> for the Z80 supports some additional directives for
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compatibility with other assemblers.
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</p>
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<a name="index-Z80_002donly-directives"></a>
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<p>These are the additional directives in <code>as</code> for the Z80:
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</p>
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<dl compact="compact">
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<dt><code>db <var>expression</var>|<var>string</var>[,<var>expression</var>|<var>string</var>...]</code></dt>
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<dt><code>defb <var>expression</var>|<var>string</var>[,<var>expression</var>|<var>string</var>...]</code></dt>
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<dd><p>For each <var>string</var> the characters are copied to the object file, for
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each other <var>expression</var> the value is stored in one byte.
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A warning is issued in case of an overflow.
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</p>
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</dd>
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<dt><code>dw <var>expression</var>[,<var>expression</var>...]</code></dt>
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<dt><code>defw <var>expression</var>[,<var>expression</var>...]</code></dt>
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<dd><p>For each <var>expression</var> the value is stored in two bytes, ignoring
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overflow.
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</p>
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</dd>
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<dt><code>d24 <var>expression</var>[,<var>expression</var>...]</code></dt>
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<dt><code>def24 <var>expression</var>[,<var>expression</var>...]</code></dt>
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<dd><p>For each <var>expression</var> the value is stored in three bytes, ignoring
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overflow.
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</p>
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</dd>
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<dt><code>d32 <var>expression</var>[,<var>expression</var>...]</code></dt>
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<dt><code>def32 <var>expression</var>[,<var>expression</var>...]</code></dt>
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<dd><p>For each <var>expression</var> the value is stored in four bytes, ignoring
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overflow.
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</p>
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</dd>
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<dt><code>ds <var>count</var>[, <var>value</var>]</code></dt>
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<dt><code>defs <var>count</var>[, <var>value</var>]</code></dt>
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<dd><p>Fill <var>count</var> bytes in the object file with <var>value</var>, if
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<var>value</var> is omitted it defaults to zero.
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</p>
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</dd>
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<dt><code><var>symbol</var> equ <var>expression</var></code></dt>
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<dt><code><var>symbol</var> defl <var>expression</var></code></dt>
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<dd><p>These directives set the value of <var>symbol</var> to <var>expression</var>. If
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<code>equ</code> is used, it is an error if <var>symbol</var> is already defined.
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Symbols defined with <code>equ</code> are not protected from redefinition.
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</p>
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</dd>
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<dt><code>set</code></dt>
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<dd><p>This is a normal instruction on Z80, and not an assembler directive.
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</p>
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</dd>
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<dt><code>psect <var>name</var></code></dt>
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<dd><p>A synonym for See <a href="Section.html#Section">Section</a>, no second argument should be given.
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</p>
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</dd>
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</dl>
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</body>
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</html>
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