156 lines
5.2 KiB
HTML
156 lines
5.2 KiB
HTML
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<title>Using as: D30V-Regs</title>
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<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="D30V_002dSyntax.html#D30V_002dSyntax" rel="up" title="D30V-Syntax">
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<a name="D30V_002dRegs"></a>
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<div class="header">
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<p>
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Next: <a href="D30V_002dAddressing.html#D30V_002dAddressing" accesskey="n" rel="next">D30V-Addressing</a>, Previous: <a href="D30V_002dGuarded.html#D30V_002dGuarded" accesskey="p" rel="prev">D30V-Guarded</a>, Up: <a href="D30V_002dSyntax.html#D30V_002dSyntax" accesskey="u" rel="up">D30V-Syntax</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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<hr>
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<a name="Register-Names-6"></a>
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<h4 class="subsubsection">9.10.2.5 Register Names</h4>
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<a name="index-D30V-registers"></a>
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<a name="index-registers_002c-D30V"></a>
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<p>You can use the predefined symbols ‘<samp>r0</samp>’ through ‘<samp>r63</samp>’ to refer
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to the D30V registers. You can also use ‘<samp>sp</samp>’ as an alias for
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‘<samp>r63</samp>’ and ‘<samp>link</samp>’ as an alias for ‘<samp>r62</samp>’. The accumulators
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are ‘<samp>a0</samp>’ and ‘<samp>a1</samp>’.
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</p>
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<p>The D30V also has predefined symbols for these control registers and status bits:
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</p><dl compact="compact">
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<dt><code>psw</code></dt>
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<dd><p>Processor Status Word
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</p></dd>
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<dt><code>bpsw</code></dt>
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<dd><p>Backup Processor Status Word
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</p></dd>
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<dt><code>pc</code></dt>
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<dd><p>Program Counter
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</p></dd>
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<dt><code>bpc</code></dt>
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<dd><p>Backup Program Counter
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</p></dd>
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<dt><code>rpt_c</code></dt>
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<dd><p>Repeat Count
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</p></dd>
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<dt><code>rpt_s</code></dt>
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<dd><p>Repeat Start address
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</p></dd>
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<dt><code>rpt_e</code></dt>
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<dd><p>Repeat End address
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</p></dd>
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<dt><code>mod_s</code></dt>
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<dd><p>Modulo Start address
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</p></dd>
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<dt><code>mod_e</code></dt>
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<dd><p>Modulo End address
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</p></dd>
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<dt><code>iba</code></dt>
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<dd><p>Instruction Break Address
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</p></dd>
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<dt><code>f0</code></dt>
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<dd><p>Flag 0
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</p></dd>
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<dt><code>f1</code></dt>
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<dd><p>Flag 1
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</p></dd>
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<dt><code>f2</code></dt>
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<dd><p>Flag 2
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</p></dd>
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<dt><code>f3</code></dt>
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<dd><p>Flag 3
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</p></dd>
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<dt><code>f4</code></dt>
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<dd><p>Flag 4
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</p></dd>
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<dt><code>f5</code></dt>
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<dd><p>Flag 5
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</p></dd>
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<dt><code>f6</code></dt>
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<dd><p>Flag 6
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</p></dd>
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<dt><code>f7</code></dt>
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<dd><p>Flag 7
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</p></dd>
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<dt><code>s</code></dt>
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<dd><p>Same as flag 4 (saturation flag)
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</p></dd>
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<dt><code>v</code></dt>
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<dd><p>Same as flag 5 (overflow flag)
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</p></dd>
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<dt><code>va</code></dt>
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<dd><p>Same as flag 6 (sticky overflow flag)
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</p></dd>
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<dt><code>c</code></dt>
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<dd><p>Same as flag 7 (carry/borrow flag)
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</p></dd>
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<dt><code>b</code></dt>
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<dd><p>Same as flag 7 (carry/borrow flag)
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</p></dd>
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</dl>
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