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<title>Using as: M68K-Syntax</title>
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<a name="M68K_002dSyntax"></a>
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<div class="header">
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<p>
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Next: <a href="M68K_002dMoto_002dSyntax.html#M68K_002dMoto_002dSyntax" accesskey="n" rel="next">M68K-Moto-Syntax</a>, Previous: <a href="M68K_002dOpts.html#M68K_002dOpts" accesskey="p" rel="previous">M68K-Opts</a>, Up: <a href="M68K_002dDependent.html#M68K_002dDependent" accesskey="u" rel="up">M68K-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="Syntax-17"></a>
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<h4 class="subsection">9.22.2 Syntax</h4>
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<a name="index-MIT"></a>
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<p>This syntax for the Motorola 680x0 was developed at <small>MIT</small>.
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</p>
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<a name="index-M680x0-syntax"></a>
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<a name="index-syntax_002c-M680x0"></a>
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<a name="index-M680x0-size-modifiers"></a>
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<a name="index-size-modifiers_002c-M680x0"></a>
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<p>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, ‘<samp>movl</samp>’ is equivalent to ‘<samp>mov.l</samp>’.
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</p>
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<p>In the following table <var>apc</var> stands for any of the address registers
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(‘<samp>%a0</samp>’ through ‘<samp>%a7</samp>’), the program counter (‘<samp>%pc</samp>’), the
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zero-address relative to the program counter (‘<samp>%zpc</samp>’), a suppressed
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address register (‘<samp>%za0</samp>’ through ‘<samp>%za7</samp>’), or it may be omitted
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entirely. The use of <var>size</var> means one of ‘<samp>w</samp>’ or ‘<samp>l</samp>’, 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 ‘<samp>1</samp>’, ‘<samp>2</samp>’,
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‘<samp>4</samp>’, or ‘<samp>8</samp>’, and it may always be omitted along with the
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leading colon.
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</p>
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<a name="index-M680x0-addressing-modes"></a>
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<a name="index-addressing-modes_002c-M680x0"></a>
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<p>The following addressing modes are understood:
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</p><dl compact="compact">
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<dt><em>Immediate</em></dt>
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<dd><p>‘<samp>#<var>number</var></samp>’
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</p>
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</dd>
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<dt><em>Data Register</em></dt>
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<dd><p>‘<samp>%d0</samp>’ through ‘<samp>%d7</samp>’
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</p>
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</dd>
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<dt><em>Address Register</em></dt>
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<dd><p>‘<samp>%a0</samp>’ through ‘<samp>%a7</samp>’<br>
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‘<samp>%a7</samp>’ is also known as ‘<samp>%sp</samp>’, i.e., the Stack Pointer. <code>%a6</code>
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is also known as ‘<samp>%fp</samp>’, the Frame Pointer.
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</p>
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</dd>
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<dt><em>Address Register Indirect</em></dt>
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<dd><p>‘<samp>%a0@</samp>’ through ‘<samp>%a7@</samp>’
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</p>
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</dd>
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<dt><em>Address Register Postincrement</em></dt>
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<dd><p>‘<samp>%a0@+</samp>’ through ‘<samp>%a7@+</samp>’
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</p>
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</dd>
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<dt><em>Address Register Predecrement</em></dt>
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<dd><p>‘<samp>%a0@-</samp>’ through ‘<samp>%a7@-</samp>’
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</p>
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</dd>
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<dt><em>Indirect Plus Offset</em></dt>
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<dd><p>‘<samp><var>apc</var>@(<var>number</var>)</samp>’
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</p>
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</dd>
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<dt><em>Index</em></dt>
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<dd><p>‘<samp><var>apc</var>@(<var>number</var>,<var>register</var>:<var>size</var>:<var>scale</var>)</samp>’
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</p>
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<p>The <var>number</var> may be omitted.
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</p>
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</dd>
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<dt><em>Postindex</em></dt>
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<dd><p>‘<samp><var>apc</var>@(<var>number</var>)@(<var>onumber</var>,<var>register</var>:<var>size</var>:<var>scale</var>)</samp>’
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</p>
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<p>The <var>onumber</var> or the <var>register</var>, but not both, may be omitted.
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</p>
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</dd>
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<dt><em>Preindex</em></dt>
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<dd><p>‘<samp><var>apc</var>@(<var>number</var>,<var>register</var>:<var>size</var>:<var>scale</var>)@(<var>onumber</var>)</samp>’
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</p>
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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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</p>
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</dd>
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<dt><em>Absolute</em></dt>
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<dd><p>‘<samp><var>symbol</var></samp>’, or ‘<samp><var>digits</var></samp>’, optionally followed by
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‘<samp>:b</samp>’, ‘<samp>:w</samp>’, or ‘<samp>:l</samp>’.
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</p></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="M68K_002dMoto_002dSyntax.html#M68K_002dMoto_002dSyntax" accesskey="n" rel="next">M68K-Moto-Syntax</a>, Previous: <a href="M68K_002dOpts.html#M68K_002dOpts" accesskey="p" rel="previous">M68K-Opts</a>, Up: <a href="M68K_002dDependent.html#M68K_002dDependent" accesskey="u" rel="up">M68K-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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