183 lines
8.2 KiB
HTML
183 lines
8.2 KiB
HTML
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Copyright (C) 1991-2021 Free Software Foundation, Inc.
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<head>
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<title>Using as: Z80 Directives</title>
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<meta name="description" content="Using as: Z80 Directives">
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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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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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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="previous">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">9.56.4 Z80 Assembler Directives</h4>
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<a name="index-Z80_002donly-directives"></a>
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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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<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><code>.assume ADL = <var>expression</var></code></code></dt>
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<dd><a name="index-_002eassume-directive_002c-Z80"></a>
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<p>Set ADL status for eZ80. Non-zero value enable compilation in ADL mode else
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used Z80 mode. ADL and Z80 mode produces incompatible object code. Mixing
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both of them within one binary may lead problems with disassembler.
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</p>
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</dd>
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<dt><code><code>db <var>expression</var>|<var>string</var>[,<var>expression</var>|<var>string</var>...]</code></code></dt>
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<dd><a name="index-db-directive_002c-Z80"></a>
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</dd>
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<dt><code><code>defb <var>expression</var>|<var>string</var>[,<var>expression</var>|<var>string</var>...]</code></code></dt>
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<dd><a name="index-defb-directive_002c-Z80"></a>
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</dd>
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<dt><code><code>defm <var>string</var>[,<var>string</var>...]</code></code></dt>
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<dd><a name="index-defm-directive_002c-Z80"></a>
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<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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Backslash symbol in the strings is generic symbol, it cannot be used as
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escape character. See <a href="Ascii.html#Ascii"><code>.ascii</code></a>.
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</p>
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</dd>
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<dt><code><code>dw <var>expression</var>[,<var>expression</var>...]</code></code></dt>
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<dd><a name="index-dw-directive_002c-Z80"></a>
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</dd>
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<dt><code><code>defw <var>expression</var>[,<var>expression</var>...]</code></code></dt>
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<dd><a name="index-defw-directive_002c-Z80"></a>
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<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><code>d24 <var>expression</var>[,<var>expression</var>...]</code></code></dt>
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<dd><a name="index-d24-directive_002c-Z80"></a>
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</dd>
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<dt><code><code>def24 <var>expression</var>[,<var>expression</var>...]</code></code></dt>
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<dd><a name="index-def24-directive_002c-Z80"></a>
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<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><code>d32 <var>expression</var>[,<var>expression</var>...]</code></code></dt>
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<dd><a name="index-d32-directive_002c-Z80"></a>
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</dd>
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<dt><code><code>def32 <var>expression</var>[,<var>expression</var>...]</code></code></dt>
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<dd><a name="index-def32-directive_002c-Z80"></a>
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<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><code>ds <var>count</var>[, <var>value</var>]</code></code></dt>
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<dd><a name="index-ds-directive_002c-Z80"></a>
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</dd>
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<dt><code><code>defs <var>count</var>[, <var>value</var>]</code></code></dt>
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<dd><a name="index-defs-directive_002c-Z80"></a>
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<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><code><var>symbol</var> defl <var>expression</var></code></code></dt>
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<dd><a name="index-defl-directive_002c-Z80"></a>
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<p>The <code>defl</code> directive is like <code>.set</code> but with different
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syntax. See <a href="Set.html#Set"><code>.set</code></a>.
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It set the value of <var>symbol</var> to <var>expression</var>. Symbols defined
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with <code>defl</code> are not protected from redefinition.
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</p>
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</dd>
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<dt><code><code><var>symbol</var> equ <var>expression</var></code></code></dt>
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<dd><a name="index-equ-directive_002c-Z80"></a>
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<p>The <code>equ</code> directive is like <code>.equiv</code> but with different
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syntax. See <a href="Equiv.html#Equiv"><code>.equiv</code></a>.
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It set the value of <var>symbol</var> to <var>expression</var>. It is an error
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if <var>symbol</var> is already defined. Symbols defined with <code>equ</code>
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are not protected from redefinition.
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</p>
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</dd>
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<dt><code><code>psect <var>name</var></code></code></dt>
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<dd><a name="index-psect-directive_002c-Z80"></a>
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<p>A synonym for <code>.section</code>, no second argument should be given.
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See <a href="Section.html#Section"><code>.section</code></a>.
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</p>
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</dd>
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<dt><code><code>xdef <var>symbol</var></code></code></dt>
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<dd><a name="index-xdef-directive_002c-Z80"></a>
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<p>A synonym for <code>.global</code>, make <var>symbol</var> is visible to linker.
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See <a href="Global.html#Global"><code>.global</code></a>.
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</p>
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</dd>
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<dt><code><code>xref <var>name</var></code></code></dt>
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<dd><a name="index-xref-directive_002c-Z80"></a>
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<p>A synonym for <code>.extern</code> (<a href="Extern.html#Extern"><code>.extern</code></a>).
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</p>
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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="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="previous">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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</body>
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</html>
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