85 lines
3.9 KiB
HTML
85 lines
3.9 KiB
HTML
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<title>D30V-Regs - Using as</title>
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<link rel="up" href="D30V_002dSyntax.html#D30V_002dSyntax" title="D30V-Syntax">
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<link rel="prev" href="D30V_002dGuarded.html#D30V_002dGuarded" title="D30V-Guarded">
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<!--
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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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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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</head>
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<body>
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<div class="node">
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<a name="D30V-Regs"></a>
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<a name="D30V_002dRegs"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="D30V_002dAddressing.html#D30V_002dAddressing">D30V-Addressing</a>,
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Previous: <a rel="previous" accesskey="p" href="D30V_002dGuarded.html#D30V_002dGuarded">D30V-Guarded</a>,
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Up: <a rel="up" accesskey="u" href="D30V_002dSyntax.html#D30V_002dSyntax">D30V-Syntax</a>
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<hr>
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</div>
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<h5 class="subsubsection">9.12.2.5 Register Names</h5>
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<p><a name="index-D30V-registers-1021"></a><a name="index-registers_002c-D30V-1022"></a>You can use the predefined symbols ‘<samp><span class="samp">r0</span></samp>’ through ‘<samp><span class="samp">r63</span></samp>’ to refer
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to the D30V registers. You can also use ‘<samp><span class="samp">sp</span></samp>’ as an alias for
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‘<samp><span class="samp">r63</span></samp>’ and ‘<samp><span class="samp">link</span></samp>’ as an alias for ‘<samp><span class="samp">r62</span></samp>’. The accumulators
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are ‘<samp><span class="samp">a0</span></samp>’ and ‘<samp><span class="samp">a1</span></samp>’.
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<p>The D30V also has predefined symbols for these control registers and status bits:
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<dl>
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<dt><code>psw</code><dd>Processor Status Word
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<br><dt><code>bpsw</code><dd>Backup Processor Status Word
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<br><dt><code>pc</code><dd>Program Counter
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<br><dt><code>bpc</code><dd>Backup Program Counter
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<br><dt><code>rpt_c</code><dd>Repeat Count
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<br><dt><code>rpt_s</code><dd>Repeat Start address
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<br><dt><code>rpt_e</code><dd>Repeat End address
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<br><dt><code>mod_s</code><dd>Modulo Start address
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<br><dt><code>mod_e</code><dd>Modulo End address
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<br><dt><code>iba</code><dd>Instruction Break Address
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<br><dt><code>f0</code><dd>Flag 0
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<br><dt><code>f1</code><dd>Flag 1
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<br><dt><code>f2</code><dd>Flag 2
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<br><dt><code>f3</code><dd>Flag 3
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<br><dt><code>f4</code><dd>Flag 4
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<br><dt><code>f5</code><dd>Flag 5
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<br><dt><code>f6</code><dd>Flag 6
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<br><dt><code>f7</code><dd>Flag 7
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<br><dt><code>s</code><dd>Same as flag 4 (saturation flag)
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<br><dt><code>v</code><dd>Same as flag 5 (overflow flag)
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<br><dt><code>va</code><dd>Same as flag 6 (sticky overflow flag)
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<br><dt><code>c</code><dd>Same as flag 7 (carry/borrow flag)
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<br><dt><code>b</code><dd>Same as flag 7 (carry/borrow flag)
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</dl>
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</body></html>
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