92 lines
4.3 KiB
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92 lines
4.3 KiB
HTML
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<title>S12Z Syntax Overview - Using as</title>
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This file documents the GNU Assembler "as".
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Copyright (C) 1991-2019 Free Software Foundation, Inc.
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<a name="S12Z-Syntax-Overview"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="S12Z-Addressing-Modes.html#S12Z-Addressing-Modes">S12Z Addressing Modes</a>,
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Up: <a rel="up" accesskey="u" href="S12Z-Syntax.html#S12Z-Syntax">S12Z Syntax</a>
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<hr>
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</div>
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<h5 class="subsubsection">9.24.2.1 Overview</h5>
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<p>In the S12Z syntax, the instruction name comes first and it may
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be followed by one, or by several operands.
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In most cases the maximum number of operands is three.
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Operands are separated by a comma (‘<samp><span class="samp">,</span></samp>’).
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A comma however does not act as a separator if it appears within parentheses
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(‘<samp><span class="samp">()</span></samp>’) or within square brackets (‘<samp><span class="samp">[]</span></samp>’).
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<code>as</code> will complain if too many, too few or inappropriate operands
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are specified for a given instruction.
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<p>Some instructions accept and (in certain situations require) a suffix
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indicating the size of the operand.
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The suffix is separated from the instruction name by a period (‘<samp><span class="samp">.</span></samp>’)
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and may be one of ‘<samp><span class="samp">b</span></samp>’, ‘<samp><span class="samp">w</span></samp>’, ‘<samp><span class="samp">p</span></samp>’ or ‘<samp><span class="samp">l</span></samp>’ indicating
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`byte' (a single byte), `word' (2 bytes), `pointer' (3 bytes) or `long' (4 bytes)
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respectively.
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<p>Example:
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<pre class="smallexample"> bset.b 0xA98, #5
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mov.b #6, 0x2409
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ld d0, #4
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mov.l (d0, x), 0x2409
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inc d0
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cmp d0, #12
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blt *-4
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lea x, 0x2409
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st y, (1, x)
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</pre>
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<p><a name="index-line-comment-character_002c-S12Z-1524"></a>The presence of a ‘<samp><span class="samp">;</span></samp>’ character anywhere
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on a line indicates the start of a comment that extends to the end of
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that line.
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<p>A ‘<samp><span class="samp">*</span></samp>’ or a ‘<samp><span class="samp">#</span></samp>’ character at the start of a line also
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introduces a line comment, but these characters do not work elsewhere
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on the line. If the first character of the line is a ‘<samp><span class="samp">#</span></samp>’ then as
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well as starting a comment, the line could also be logical line number
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directive (see <a href="Comments.html#Comments">Comments</a>) or a preprocessor control command
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(see <a href="Preprocessing.html#Preprocessing">Preprocessing</a>).
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<p><a name="index-line-separator_002c-S12Z-1525"></a><a name="index-statement-separator_002c-S12Z-1526"></a><a name="index-S12Z-line-separator-1527"></a>The S12Z assembler does not currently support a line separator
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character.
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</body></html>
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