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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

  2. <html>

  3. <!-- This file documents the GNU Assembler "as".

  4. 

  5. Copyright (C) 1991-2020 Free Software Foundation, Inc.

  6. 

  7. Permission is granted to copy, distribute and/or modify this document

  8. under the terms of the GNU Free Documentation License, Version 1.3

  9. or any later version published by the Free Software Foundation;

  10. with no Invariant Sections, with no Front-Cover Texts, and with no

  11. Back-Cover Texts.  A copy of the license is included in the

  12. section entitled "GNU Free Documentation License".

  13.  -->

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  15. <head>

  16. <meta http-equiv="Content-Type" content="text/html; charset=utf-8">

  17. <title>Z80 Directives (Using as)</title>

  18. 

  19. <meta name="description" content="Z80 Directives (Using as)">

  20. <meta name="keywords" content="Z80 Directives (Using as)">

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  24. <link href="index.html#Top" rel="start" title="Top">

  25. <link href="AS-Index.html#AS-Index" rel="index" title="AS Index">

  26. <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">

  27. <link href="Z80_002dDependent.html#Z80_002dDependent" rel="up" title="Z80-Dependent">

  28. <link href="Z80-Opcodes.html#Z80-Opcodes" rel="next" title="Z80 Opcodes">

  29. <link href="Z80-Floating-Point.html#Z80-Floating-Point" rel="prev" title="Z80 Floating Point">

  30. <style type="text/css">

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  56. </style>

  57. 

  58. 

  59. </head>

  60. 

  61. <body lang="en">

  62. <a name="Z80-Directives"></a>

  63. <div class="header">

  64. <p>

  65. 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> &nbsp; [<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>

  66. </div>

  67. <hr>

  68. <a name="Z80-Assembler-Directives"></a>

  69. <h4 class="subsection">9.56.4 Z80 Assembler Directives</h4>

  70. <a name="index-Z80_002donly-directives"></a>

  71. 

  72. <p><code>as</code> for the Z80 supports some additional directives for

  73. compatibility with other assemblers.

  74. </p>

  75. <p>These are the additional directives in <code>as</code> for the Z80:

  76. </p>

  77. <dl compact="compact">

  78. <dt><code><code>.assume ADL = <var>expression</var></code></code></dt>

  79. <dd><a name="index-_002eassume-directive_002c-Z80"></a>

  80. <p>Set ADL status for eZ80. Non-zero value enable compilation in ADL mode else

  81. used Z80 mode. ADL and Z80 mode produces incompatible object code. Mixing

  82. both of them within one binary may lead problems with disassembler.

  83. </p>

  84. </dd>

  85. <dt><code><code>db <var>expression</var>|<var>string</var>[,<var>expression</var>|<var>string</var>...]</code></code></dt>

  86. <dd><a name="index-db-directive_002c-Z80"></a>

  87. </dd>

  88. <dt><code><code>defb <var>expression</var>|<var>string</var>[,<var>expression</var>|<var>string</var>...]</code></code></dt>

  89. <dd><a name="index-defb-directive_002c-Z80"></a>

  90. </dd>

  91. <dt><code><code>defm <var>string</var>[,<var>string</var>...]</code></code></dt>

  92. <dd><a name="index-defm-directive_002c-Z80"></a>

  93. <p>For each <var>string</var> the characters are copied to the object file, for

  94. each other <var>expression</var> the value is stored in one byte.

  95. A warning is issued in case of an overflow.

  96. Backslash symbol in the strings is generic symbol, it cannot be used as

  97. escape character.  See <a href="Ascii.html#Ascii"><code>.ascii</code></a>.

  98. </p>

  99. </dd>

  100. <dt><code><code>dw <var>expression</var>[,<var>expression</var>...]</code></code></dt>

  101. <dd><a name="index-dw-directive_002c-Z80"></a>

  102. </dd>

  103. <dt><code><code>defw <var>expression</var>[,<var>expression</var>...]</code></code></dt>

  104. <dd><a name="index-defw-directive_002c-Z80"></a>

  105. <p>For each <var>expression</var> the value is stored in two bytes, ignoring

  106. overflow.

  107. </p>

  108. </dd>

  109. <dt><code><code>d24 <var>expression</var>[,<var>expression</var>...]</code></code></dt>

  110. <dd><a name="index-d24-directive_002c-Z80"></a>

  111. </dd>

  112. <dt><code><code>def24 <var>expression</var>[,<var>expression</var>...]</code></code></dt>

  113. <dd><a name="index-def24-directive_002c-Z80"></a>

  114. <p>For each <var>expression</var> the value is stored in three bytes, ignoring

  115. overflow.

  116. </p>

  117. </dd>

  118. <dt><code><code>d32 <var>expression</var>[,<var>expression</var>...]</code></code></dt>

  119. <dd><a name="index-d32-directive_002c-Z80"></a>

  120. </dd>

  121. <dt><code><code>def32 <var>expression</var>[,<var>expression</var>...]</code></code></dt>

  122. <dd><a name="index-def32-directive_002c-Z80"></a>

  123. <p>For each <var>expression</var> the value is stored in four bytes, ignoring

  124. overflow.

  125. </p>

  126. </dd>

  127. <dt><code><code>ds <var>count</var>[, <var>value</var>]</code></code></dt>

  128. <dd><a name="index-ds-directive_002c-Z80"></a>

  129. </dd>

  130. <dt><code><code>defs <var>count</var>[, <var>value</var>]</code></code></dt>

  131. <dd><a name="index-defs-directive_002c-Z80"></a>

  132. <p>Fill <var>count</var> bytes in the object file with <var>value</var>, if

  133. <var>value</var> is omitted it defaults to zero.

  134. </p>

  135. </dd>

  136. <dt><code><code><var>symbol</var> defl <var>expression</var></code></code></dt>

  137. <dd><a name="index-defl-directive_002c-Z80"></a>

  138. <p>The <code>defl</code> directive is like <code>.set</code> but with different

  139. syntax.  See <a href="Set.html#Set"><code>.set</code></a>.

  140. It set the value of <var>symbol</var> to <var>expression</var>. Symbols defined

  141. with <code>defl</code> are not protected from redefinition.

  142. </p>

  143. </dd>

  144. <dt><code><code><var>symbol</var> equ <var>expression</var></code></code></dt>

  145. <dd><a name="index-equ-directive_002c-Z80"></a>

  146. <p>The <code>equ</code> directive is like <code>.equiv</code> but with different

  147. syntax.  See <a href="Equiv.html#Equiv"><code>.equiv</code></a>.

  148. It set the value of <var>symbol</var> to <var>expression</var>. It is an error

  149. if <var>symbol</var> is already defined. Symbols defined with <code>equ</code>

  150. are not protected from redefinition.

  151. </p>

  152. </dd>

  153. <dt><code><code>psect <var>name</var></code></code></dt>

  154. <dd><a name="index-psect-directive_002c-Z80"></a>

  155. <p>A synonym for <code>.section</code>, no second argument should be given.

  156. See <a href="Section.html#Section"><code>.section</code></a>.

  157. </p>

  158. </dd>

  159. <dt><code><code>xdef <var>symbol</var></code></code></dt>

  160. <dd><a name="index-xdef-directive_002c-Z80"></a>

  161. <p>A synonym for <code>.global</code>, make <var>symbol</var> is visible to linker.

  162. See <a href="Global.html#Global"><code>.global</code></a>.

  163. </p>

  164. </dd>

  165. <dt><code><code>xref <var>name</var></code></code></dt>

  166. <dd><a name="index-xref-directive_002c-Z80"></a>

  167. <p>A synonym for <code>.extern</code> (<a href="Extern.html#Extern"><code>.extern</code></a>).

  168. </p>

  169. </dd>

  170. </dl>

  171. 

  172. <hr>

  173. <div class="header">

  174. <p>

  175. 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> &nbsp; [<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>

  176. </div>

  177. 

  178. 

  179. 

  180. </body>

  181. </html>