77 lines
3.9 KiB
HTML
77 lines
3.9 KiB
HTML
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<title>VAX-operands - Using as</title>
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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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<body>
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<div class="node">
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<a name="VAX-operands"></a>
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<a name="VAX_002doperands"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="VAX_002dno.html#VAX_002dno">VAX-no</a>,
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Previous: <a rel="previous" accesskey="p" href="VAX_002dbranch.html#VAX_002dbranch">VAX-branch</a>,
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Up: <a rel="up" accesskey="u" href="Vax_002dDependent.html#Vax_002dDependent">Vax-Dependent</a>
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<hr>
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</div>
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<h4 class="subsection">9.50.6 VAX Operands</h4>
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<p><a name="index-VAX-operand-notation-2513"></a><a name="index-operand-notation_002c-VAX-2514"></a><a name="index-immediate-character_002c-VAX-2515"></a><a name="index-VAX-immediate-character-2516"></a>The immediate character is ‘<samp><span class="samp">$</span></samp>’ for Unix compatibility, not
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‘<samp><span class="samp">#</span></samp>’ as DEC writes it.
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<p><a name="index-indirect-character_002c-VAX-2517"></a><a name="index-VAX-indirect-character-2518"></a>The indirect character is ‘<samp><span class="samp">*</span></samp>’ for Unix compatibility, not
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‘<samp><span class="samp">@</span></samp>’ as DEC writes it.
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<p><a name="index-displacement-sizing-character_002c-VAX-2519"></a><a name="index-VAX-displacement-sizing-character-2520"></a>The displacement sizing character is ‘<samp><span class="samp">`</span></samp>’ (an accent grave) for
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Unix compatibility, not ‘<samp><span class="samp">^</span></samp>’ as DEC writes it. The letter
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preceding ‘<samp><span class="samp">`</span></samp>’ may have either case. ‘<samp><span class="samp">G</span></samp>’ is not
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understood, but all other letters (<code>b i l s w</code>) are understood.
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<p><a name="index-register-names_002c-VAX-2521"></a><a name="index-VAX-register-names-2522"></a>Register names understood are <code>r0 r1 r2 ... r15 ap fp sp
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pc</code>. Upper and lower case letters are equivalent.
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<p>For instance
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<pre class="smallexample"> tstb *w`$4(r5)
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</pre>
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<p>Any expression is permitted in an operand. Operands are comma
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separated.
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<!-- There is some bug to do with recognizing expressions -->
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<!-- in operands, but I forget what it is. It is -->
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<!-- a syntax clash because () is used as an address mode -->
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<!-- and to encapsulate sub-expressions. -->
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</body></html>
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