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<title>M68K-Syntax - Using as</title>
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
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2006, 2007 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 1.1
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or any later version published by the Free Software Foundation;
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<a name="M68K_002dSyntax"></a>Next: <a rel="next" accesskey="n" href="M68K_002dMoto_002dSyntax.html#M68K_002dMoto_002dSyntax">M68K-Moto-Syntax</a>,
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Previous: <a rel="previous" accesskey="p" href="M68K_002dOpts.html#M68K_002dOpts">M68K-Opts</a>,
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Up: <a rel="up" accesskey="u" href="M68K_002dDependent.html#M68K_002dDependent">M68K-Dependent</a>
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<h4 class="subsection">9.20.2 Syntax</h4>
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<p><a name="index-_0040sc_007bmit_007d-1107"></a>This syntax for the Motorola 680x0 was developed at <span class="sc">mit</span>.
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<p><a name="index-M680x0-syntax-1108"></a><a name="index-syntax_002c-M680x0-1109"></a><a name="index-M680x0-size-modifiers-1110"></a><a name="index-size-modifiers_002c-M680x0-1111"></a>The 680x0 version of <code>as</code> uses instructions names and
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syntax compatible with the Sun assembler. Intervening periods are
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ignored; for example, <span class="samp">movl</span> is equivalent to <span class="samp">mov.l</span>.
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<p>In the following table <var>apc</var> stands for any of the address registers
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(<span class="samp">%a0</span> through <span class="samp">%a7</span>), the program counter (<span class="samp">%pc</span>), the
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zero-address relative to the program counter (<span class="samp">%zpc</span>), a suppressed
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address register (<span class="samp">%za0</span> through <span class="samp">%za7</span>), or it may be omitted
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entirely. The use of <var>size</var> means one of <span class="samp">w</span> or <span class="samp">l</span>, and
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it may be omitted, along with the leading colon, unless a scale is also
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specified. The use of <var>scale</var> means one of <span class="samp">1</span>, <span class="samp">2</span>,
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<span class="samp">4</span>, or <span class="samp">8</span>, and it may always be omitted along with the
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leading colon.
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<p><a name="index-M680x0-addressing-modes-1112"></a><a name="index-addressing-modes_002c-M680x0-1113"></a>The following addressing modes are understood:
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<dl>
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<dt><dfn>Immediate</dfn><dd><span class="samp">#</span><var>number</var>
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<br><dt><dfn>Data Register</dfn><dd><span class="samp">%d0</span> through <span class="samp">%d7</span>
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<br><dt><dfn>Address Register</dfn><dd><span class="samp">%a0</span> through <span class="samp">%a7</span><br>
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<span class="samp">%a7</span> is also known as <span class="samp">%sp</span>, i.e., the Stack Pointer. <code>%a6</code>
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is also known as <span class="samp">%fp</span>, the Frame Pointer.
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<br><dt><dfn>Address Register Indirect</dfn><dd><span class="samp">%a0@</span> through <span class="samp">%a7@</span>
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<br><dt><dfn>Address Register Postincrement</dfn><dd><span class="samp">%a0@+</span> through <span class="samp">%a7@+</span>
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<br><dt><dfn>Address Register Predecrement</dfn><dd><span class="samp">%a0@-</span> through <span class="samp">%a7@-</span>
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<br><dt><dfn>Indirect Plus Offset</dfn><dd><var>apc</var><span class="samp">@(</span><var>number</var><span class="samp">)</span>
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<br><dt><dfn>Index</dfn><dd><var>apc</var><span class="samp">@(</span><var>number</var><span class="samp">,</span><var>register</var><span class="samp">:</span><var>size</var><span class="samp">:</span><var>scale</var><span class="samp">)</span>
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<p>The <var>number</var> may be omitted.
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<br><dt><dfn>Postindex</dfn><dd><var>apc</var><span class="samp">@(</span><var>number</var><span class="samp">)@(</span><var>onumber</var><span class="samp">,</span><var>register</var><span class="samp">:</span><var>size</var><span class="samp">:</span><var>scale</var><span class="samp">)</span>
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<p>The <var>onumber</var> or the <var>register</var>, but not both, may be omitted.
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<br><dt><dfn>Preindex</dfn><dd><var>apc</var><span class="samp">@(</span><var>number</var><span class="samp">,</span><var>register</var><span class="samp">:</span><var>size</var><span class="samp">:</span><var>scale</var><span class="samp">)@(</span><var>onumber</var><span class="samp">)</span>
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<p>The <var>number</var> may be omitted. Omitting the <var>register</var> produces
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the Postindex addressing mode.
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<br><dt><dfn>Absolute</dfn><dd><var>symbol</var>, or <var>digits</var>, optionally followed by
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<span class="samp">:b</span>, <span class="samp">:w</span>, or <span class="samp">:l</span>.
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</dl>
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