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| <title>Using as: M68K-Moto-Syntax</title> |
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| 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> [<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="Motorola-Syntax"></a> |
| <h4 class="subsection">9.23.3 Motorola Syntax</h4> |
| |
| <a name="index-Motorola-syntax-for-the-680x0"></a> |
| <a name="index-alternate-syntax-for-the-680x0"></a> |
| |
| <p>The standard Motorola syntax for this chip differs from the syntax |
| already discussed (see <a href="M68K_002dSyntax.html#M68K_002dSyntax">Syntax</a>). <code>as</code> can |
| accept Motorola syntax for operands, even if <small>MIT</small> syntax is used for |
| other operands in the same instruction. The two kinds of syntax are |
| fully compatible. |
| </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>’), or a |
| suppressed address register (‘<samp>%za0</samp>’ through ‘<samp>%za7</samp>’). The use |
| of <var>size</var> means one of ‘<samp>w</samp>’ or ‘<samp>l</samp>’, and it may always be |
| omitted along with the leading dot. 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 asterisk. |
| </p> |
| <p>The following additional addressing modes are understood: |
| </p> |
| <dl compact="compact"> |
| <dt><em>Address Register Indirect</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 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>number</var>(<var>%a0</var>)</samp>’ through ‘<samp><var>number</var>(<var>%a7</var>)</samp>’, |
| or ‘<samp><var>number</var>(<var>%pc</var>)</samp>’. |
| </p> |
| <p>The <var>number</var> may also appear within the parentheses, as in |
| ‘<samp>(<var>number</var>,<var>%a0</var>)</samp>’. When used with the <var>pc</var>, the |
| <var>number</var> may be omitted (with an address register, omitting the |
| <var>number</var> produces Address Register Indirect mode). |
| </p> |
| </dd> |
| <dt><em>Index</em></dt> |
| <dd><p>‘<samp><var>number</var>(<var>apc</var>,<var>register</var>.<var>size</var>*<var>scale</var>)</samp>’ |
| </p> |
| <p>The <var>number</var> may be omitted, or it may appear within the |
| parentheses. The <var>apc</var> may be omitted. The <var>register</var> and the |
| <var>apc</var> may appear in either order. If both <var>apc</var> and |
| <var>register</var> are address registers, and the <var>size</var> and <var>scale</var> |
| are omitted, then the first register is taken as the base register, and |
| the second as the index register. |
| </p> |
| </dd> |
| <dt><em>Postindex</em></dt> |
| <dd><p>‘<samp>([<var>number</var>,<var>apc</var>],<var>register</var>.<var>size</var>*<var>scale</var>,<var>onumber</var>)</samp>’ |
| </p> |
| <p>The <var>onumber</var>, or the <var>register</var>, or both, may be omitted. |
| Either the <var>number</var> or the <var>apc</var> may be omitted, but not both. |
| </p> |
| </dd> |
| <dt><em>Preindex</em></dt> |
| <dd><p>‘<samp>([<var>number</var>,<var>apc</var>,<var>register</var>.<var>size</var>*<var>scale</var>],<var>onumber</var>)</samp>’ |
| </p> |
| <p>The <var>number</var>, or the <var>apc</var>, or the <var>register</var>, or any two of |
| them, may be omitted. The <var>onumber</var> may be omitted. The |
| <var>register</var> and the <var>apc</var> may appear in either order. If both |
| <var>apc</var> and <var>register</var> are address registers, and the <var>size</var> |
| and <var>scale</var> are omitted, then the first register is taken as the |
| base register, and the second as the index register. |
| </p></dd> |
| </dl> |
| |
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| 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> [<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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