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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

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  17. <title>M68K-Moto-Syntax (Using as)</title>

  18. 

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

  27. <link href="M68K_002dDependent.html#M68K_002dDependent" rel="up" title="M68K-Dependent">

  28. <link href="M68K_002dFloat.html#M68K_002dFloat" rel="next" title="M68K-Float">

  29. <link href="M68K_002dSyntax.html#M68K_002dSyntax" rel="prev" title="M68K-Syntax">

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  60. 

  61. <body lang="en">

  62. <a name="M68K_002dMoto_002dSyntax"></a>

  63. <div class="header">

  64. <p>

  65. Next: <a href="M68K_002dFloat.html#M68K_002dFloat" accesskey="n" rel="next">M68K-Float</a>, Previous: <a href="M68K_002dSyntax.html#M68K_002dSyntax" accesskey="p" rel="prev">M68K-Syntax</a>, Up: <a href="M68K_002dDependent.html#M68K_002dDependent" accesskey="u" rel="up">M68K-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="Motorola-Syntax"></a>

  69. <h4 class="subsection">9.22.3 Motorola Syntax</h4>

  70. 

  71. <a name="index-Motorola-syntax-for-the-680x0"></a>

  72. <a name="index-alternate-syntax-for-the-680x0"></a>

  73. 

  74. <p>The standard Motorola syntax for this chip differs from the syntax

  75. already discussed (see <a href="M68K_002dSyntax.html#M68K_002dSyntax">Syntax</a>).  <code>as</code> can

  76. accept Motorola syntax for operands, even if <small>MIT</small> syntax is used for

  77. other operands in the same instruction.  The two kinds of syntax are

  78. fully compatible.

  79. </p>

  80. <p>In the following table <var>apc</var> stands for any of the address registers

  81. (&lsquo;<samp>%a0</samp>&rsquo; through &lsquo;<samp>%a7</samp>&rsquo;), the program counter (&lsquo;<samp>%pc</samp>&rsquo;), the

  82. zero-address relative to the program counter (&lsquo;<samp>%zpc</samp>&rsquo;), or a

  83. suppressed address register (&lsquo;<samp>%za0</samp>&rsquo; through &lsquo;<samp>%za7</samp>&rsquo;).  The use

  84. of <var>size</var> means one of &lsquo;<samp>w</samp>&rsquo; or &lsquo;<samp>l</samp>&rsquo;, and it may always be

  85. omitted along with the leading dot.  The use of <var>scale</var> means one of

  86. &lsquo;<samp>1</samp>&rsquo;, &lsquo;<samp>2</samp>&rsquo;, &lsquo;<samp>4</samp>&rsquo;, or &lsquo;<samp>8</samp>&rsquo;, and it may always be omitted

  87. along with the leading asterisk.

  88. </p>

  89. <p>The following additional addressing modes are understood:

  90. </p>

  91. <dl compact="compact">

  92. <dt><em>Address Register Indirect</em></dt>

  93. <dd><p>&lsquo;<samp>(%a0)</samp>&rsquo; through &lsquo;<samp>(%a7)</samp>&rsquo;<br>

  94. &lsquo;<samp>%a7</samp>&rsquo; is also known as &lsquo;<samp>%sp</samp>&rsquo;, i.e., the Stack Pointer.  <code>%a6</code>

  95. is also known as &lsquo;<samp>%fp</samp>&rsquo;, the Frame Pointer.

  96. </p>

  97. </dd>

  98. <dt><em>Address Register Postincrement</em></dt>

  99. <dd><p>&lsquo;<samp>(%a0)+</samp>&rsquo; through &lsquo;<samp>(%a7)+</samp>&rsquo;

  100. </p>

  101. </dd>

  102. <dt><em>Address Register Predecrement</em></dt>

  103. <dd><p>&lsquo;<samp>-(%a0)</samp>&rsquo; through &lsquo;<samp>-(%a7)</samp>&rsquo;

  104. </p>

  105. </dd>

  106. <dt><em>Indirect Plus Offset</em></dt>

  107. <dd><p>&lsquo;<samp><var>number</var>(<var>%a0</var>)</samp>&rsquo; through &lsquo;<samp><var>number</var>(<var>%a7</var>)</samp>&rsquo;,

  108. or &lsquo;<samp><var>number</var>(<var>%pc</var>)</samp>&rsquo;.

  109. </p>

  110. <p>The <var>number</var> may also appear within the parentheses, as in

  111. &lsquo;<samp>(<var>number</var>,<var>%a0</var>)</samp>&rsquo;.  When used with the <var>pc</var>, the

  112. <var>number</var> may be omitted (with an address register, omitting the

  113. <var>number</var> produces Address Register Indirect mode).

  114. </p>

  115. </dd>

  116. <dt><em>Index</em></dt>

  117. <dd><p>&lsquo;<samp><var>number</var>(<var>apc</var>,<var>register</var>.<var>size</var>*<var>scale</var>)</samp>&rsquo;

  118. </p>

  119. <p>The <var>number</var> may be omitted, or it may appear within the

  120. parentheses.  The <var>apc</var> may be omitted.  The <var>register</var> and the

  121. <var>apc</var> may appear in either order.  If both <var>apc</var> and

  122. <var>register</var> are address registers, and the <var>size</var> and <var>scale</var>

  123. are omitted, then the first register is taken as the base register, and

  124. the second as the index register.

  125. </p>

  126. </dd>

  127. <dt><em>Postindex</em></dt>

  128. <dd><p>&lsquo;<samp>([<var>number</var>,<var>apc</var>],<var>register</var>.<var>size</var>*<var>scale</var>,<var>onumber</var>)</samp>&rsquo;

  129. </p>

  130. <p>The <var>onumber</var>, or the <var>register</var>, or both, may be omitted.

  131. Either the <var>number</var> or the <var>apc</var> may be omitted, but not both.

  132. </p>

  133. </dd>

  134. <dt><em>Preindex</em></dt>

  135. <dd><p>&lsquo;<samp>([<var>number</var>,<var>apc</var>,<var>register</var>.<var>size</var>*<var>scale</var>],<var>onumber</var>)</samp>&rsquo;

  136. </p>

  137. <p>The <var>number</var>, or the <var>apc</var>, or the <var>register</var>, or any two of

  138. them, may be omitted.  The <var>onumber</var> may be omitted.  The

  139. <var>register</var> and the <var>apc</var> may appear in either order.  If both

  140. <var>apc</var> and <var>register</var> are address registers, and the <var>size</var>

  141. and <var>scale</var> are omitted, then the first register is taken as the

  142. base register, and the second as the index register.

  143. </p></dd>

  144. </dl>

  145. 

  146. <hr>

  147. <div class="header">

  148. <p>

  149. Next: <a href="M68K_002dFloat.html#M68K_002dFloat" accesskey="n" rel="next">M68K-Float</a>, Previous: <a href="M68K_002dSyntax.html#M68K_002dSyntax" accesskey="p" rel="prev">M68K-Syntax</a>, Up: <a href="M68K_002dDependent.html#M68K_002dDependent" accesskey="u" rel="up">M68K-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>

  150. </div>

  151. 

  152. 

  153. 

  154. </body>

  155. </html>