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| <h4 class="subsection">9.38.4 Z80 Assembler Directives</h4> |
| |
| <p><samp><span class="command">as</span></samp> for the Z80 supports some additional directives for |
| compatibility with other assemblers. |
| |
| <p><a name="index-Z80_002donly-directives-1857"></a>These are the additional directives in <code>as</code> for the Z80: |
| |
| <dl> |
| <dt><code>db </code><var>expression</var><code>|</code><var>string</var><code>[,</code><var>expression</var><code>|</code><var>string</var><code>...]</code><dt><code>defb </code><var>expression</var><code>|</code><var>string</var><code>[,</code><var>expression</var><code>|</code><var>string</var><code>...]</code><dd>For each <var>string</var> the characters are copied to the object file, for |
| each other <var>expression</var> the value is stored in one byte. |
| A warning is issued in case of an overflow. |
| |
| <br><dt><code>dw </code><var>expression</var><code>[,</code><var>expression</var><code>...]</code><dt><code>defw </code><var>expression</var><code>[,</code><var>expression</var><code>...]</code><dd>For each <var>expression</var> the value is stored in two bytes, ignoring |
| overflow. |
| |
| <br><dt><code>d24 </code><var>expression</var><code>[,</code><var>expression</var><code>...]</code><dt><code>def24 </code><var>expression</var><code>[,</code><var>expression</var><code>...]</code><dd>For each <var>expression</var> the value is stored in three bytes, ignoring |
| overflow. |
| |
| <br><dt><code>d32 </code><var>expression</var><code>[,</code><var>expression</var><code>...]</code><dt><code>def32 </code><var>expression</var><code>[,</code><var>expression</var><code>...]</code><dd>For each <var>expression</var> the value is stored in four bytes, ignoring |
| overflow. |
| |
| <br><dt><code>ds </code><var>count</var><code>[, </code><var>value</var><code>]</code><dt><code>defs </code><var>count</var><code>[, </code><var>value</var><code>]</code><dd><!-- Synonyms for @code{ds.b}, --> |
| <!-- which should have been described elsewhere --> |
| Fill <var>count</var> bytes in the object file with <var>value</var>, if |
| <var>value</var> is omitted it defaults to zero. |
| |
| <br><dt><var>symbol</var><code> equ </code><var>expression</var><dt><var>symbol</var><code> defl </code><var>expression</var><dd>These directives set the value of <var>symbol</var> to <var>expression</var>. If |
| <code>equ</code> is used, it is an error if <var>symbol</var> is already defined. |
| Symbols defined with <code>equ</code> are not protected from redefinition. |
| |
| <br><dt><code>set</code><dd>This is a normal instruction on Z80, and not an assembler directive. |
| |
| <br><dt><code>psect </code><var>name</var><dd>A synonym for See <a href="Section.html#Section">Section</a>, no second argument should be given. |
| |
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