86 lines
4.7 KiB
HTML
86 lines
4.7 KiB
HTML
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<html lang="en">
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<head>
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<title>Z80 Directives - Using as</title>
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<meta name="description" content="Using as">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Z80_002dDependent.html#Z80_002dDependent" title="Z80-Dependent">
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<link rel="prev" href="Z80-Floating-Point.html#Z80-Floating-Point" title="Z80 Floating Point">
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<link rel="next" href="Z80-Opcodes.html#Z80-Opcodes" title="Z80 Opcodes">
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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) 1991-2019 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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</head>
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<body>
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<div class="node">
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<a name="Z80-Directives"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Z80-Opcodes.html#Z80-Opcodes">Z80 Opcodes</a>,
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Previous: <a rel="previous" accesskey="p" href="Z80-Floating-Point.html#Z80-Floating-Point">Z80 Floating Point</a>,
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Up: <a rel="up" accesskey="u" href="Z80_002dDependent.html#Z80_002dDependent">Z80-Dependent</a>
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<hr>
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</div>
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<h4 class="subsection">9.56.4 Z80 Assembler Directives</h4>
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<p><samp><span class="command">as</span></samp> for the Z80 supports some additional directives for
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compatibility with other assemblers.
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<p><a name="index-Z80_002donly-directives-2692"></a>These are the additional directives in <code>as</code> for the Z80:
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<dl>
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<dt><code>db </code><var>expression</var><code>|</code><var>string</var><code>[,</code><var>expression</var><code>|</code><var>string</var><code>...]</code><dt><code>defb </code><var>expression</var><code>|</code><var>string</var><code>[,</code><var>expression</var><code>|</code><var>string</var><code>...]</code><dd>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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<br><dt><code>dw </code><var>expression</var><code>[,</code><var>expression</var><code>...]</code><dt><code>defw </code><var>expression</var><code>[,</code><var>expression</var><code>...]</code><dd>For each <var>expression</var> the value is stored in two bytes, ignoring
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overflow.
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<br><dt><code>d24 </code><var>expression</var><code>[,</code><var>expression</var><code>...]</code><dt><code>def24 </code><var>expression</var><code>[,</code><var>expression</var><code>...]</code><dd>For each <var>expression</var> the value is stored in three bytes, ignoring
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overflow.
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<br><dt><code>d32 </code><var>expression</var><code>[,</code><var>expression</var><code>...]</code><dt><code>def32 </code><var>expression</var><code>[,</code><var>expression</var><code>...]</code><dd>For each <var>expression</var> the value is stored in four bytes, ignoring
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overflow.
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<br><dt><code>ds </code><var>count</var><code>[, </code><var>value</var><code>]</code><dt><code>defs </code><var>count</var><code>[, </code><var>value</var><code>]</code><dd><!-- Synonyms for @code{ds.b}, -->
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<!-- which should have been described elsewhere -->
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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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<br><dt><var>symbol</var><code> equ </code><var>expression</var><dt><var>symbol</var><code> defl </code><var>expression</var><dd>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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<br><dt><code>set</code><dd>This is a normal instruction on Z80, and not an assembler directive.
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<br><dt><code>psect </code><var>name</var><dd>A synonym for See <a href="Section.html#Section">Section</a>, no second argument should be given.
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</dl>
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</body></html>
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