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| <title>Using as: M68K-Syntax</title> |
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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="prev">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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| <a name="Syntax-16"></a> |
| <h4 class="subsection">9.23.2 Syntax</h4> |
| |
| <a name="index-MIT"></a> |
| <p>This syntax for the Motorola 680x0 was developed at <small>MIT</small>. |
| </p> |
| <a name="index-M680x0-syntax"></a> |
| <a name="index-syntax_002c-M680x0"></a> |
| <a name="index-M680x0-size-modifiers"></a> |
| <a name="index-size-modifiers_002c-M680x0"></a> |
| <p>The 680x0 version of <code>as</code> uses instructions names and |
| syntax compatible with the Sun assembler. Intervening periods are |
| ignored; for example, ‘<samp>movl</samp>’ is equivalent to ‘<samp>mov.l</samp>’. |
| </p> |
| <p>In the following table <var>apc</var> stands for any of the address registers |
| (‘<samp>%a0</samp>’ through ‘<samp>%a7</samp>’), the program counter (‘<samp>%pc</samp>’), the |
| zero-address relative to the program counter (‘<samp>%zpc</samp>’), a suppressed |
| address register (‘<samp>%za0</samp>’ through ‘<samp>%za7</samp>’), or it may be omitted |
| entirely. The use of <var>size</var> means one of ‘<samp>w</samp>’ or ‘<samp>l</samp>’, and |
| it may be omitted, along with the leading colon, unless a scale is also |
| specified. The use of <var>scale</var> means one of ‘<samp>1</samp>’, ‘<samp>2</samp>’, |
| ‘<samp>4</samp>’, or ‘<samp>8</samp>’, and it may always be omitted along with the |
| leading colon. |
| </p> |
| <a name="index-M680x0-addressing-modes"></a> |
| <a name="index-addressing-modes_002c-M680x0"></a> |
| <p>The following addressing modes are understood: |
| </p><dl compact="compact"> |
| <dt><em>Immediate</em></dt> |
| <dd><p>‘<samp>#<var>number</var></samp>’ |
| </p> |
| </dd> |
| <dt><em>Data Register</em></dt> |
| <dd><p>‘<samp>%d0</samp>’ through ‘<samp>%d7</samp>’ |
| </p> |
| </dd> |
| <dt><em>Address Register</em></dt> |
| <dd><p>‘<samp>%a0</samp>’ through ‘<samp>%a7</samp>’<br> |
| ‘<samp>%a7</samp>’ is also known as ‘<samp>%sp</samp>’, i.e., the Stack Pointer. <code>%a6</code> |
| is also known as ‘<samp>%fp</samp>’, the Frame Pointer. |
| </p> |
| </dd> |
| <dt><em>Address Register Indirect</em></dt> |
| <dd><p>‘<samp>%a0@</samp>’ through ‘<samp>%a7@</samp>’ |
| </p> |
| </dd> |
| <dt><em>Address Register Postincrement</em></dt> |
| <dd><p>‘<samp>%a0@+</samp>’ through ‘<samp>%a7@+</samp>’ |
| </p> |
| </dd> |
| <dt><em>Address Register Predecrement</em></dt> |
| <dd><p>‘<samp>%a0@-</samp>’ through ‘<samp>%a7@-</samp>’ |
| </p> |
| </dd> |
| <dt><em>Indirect Plus Offset</em></dt> |
| <dd><p>‘<samp><var>apc</var>@(<var>number</var>)</samp>’ |
| </p> |
| </dd> |
| <dt><em>Index</em></dt> |
| <dd><p>‘<samp><var>apc</var>@(<var>number</var>,<var>register</var>:<var>size</var>:<var>scale</var>)</samp>’ |
| </p> |
| <p>The <var>number</var> may be omitted. |
| </p> |
| </dd> |
| <dt><em>Postindex</em></dt> |
| <dd><p>‘<samp><var>apc</var>@(<var>number</var>)@(<var>onumber</var>,<var>register</var>:<var>size</var>:<var>scale</var>)</samp>’ |
| </p> |
| <p>The <var>onumber</var> or the <var>register</var>, but not both, may be omitted. |
| </p> |
| </dd> |
| <dt><em>Preindex</em></dt> |
| <dd><p>‘<samp><var>apc</var>@(<var>number</var>,<var>register</var>:<var>size</var>:<var>scale</var>)@(<var>onumber</var>)</samp>’ |
| </p> |
| <p>The <var>number</var> may be omitted. Omitting the <var>register</var> produces |
| the Postindex addressing mode. |
| </p> |
| </dd> |
| <dt><em>Absolute</em></dt> |
| <dd><p>‘<samp><var>symbol</var></samp>’, or ‘<samp><var>digits</var></samp>’, optionally followed by |
| ‘<samp>:b</samp>’, ‘<samp>:w</samp>’, or ‘<samp>:l</samp>’. |
| </p></dd> |
| </dl> |
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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="prev">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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