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76 lines
3.1 KiB
HTML
76 lines
3.1 KiB
HTML
15 years ago
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<title>SH64-Addressing - Using as</title>
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<meta name="description" content="Using as">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="SH64-Syntax.html#SH64-Syntax" title="SH64 Syntax">
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<link rel="prev" href="SH64_002dRegs.html#SH64_002dRegs" title="SH64-Regs">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
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2006, 2007 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 1.1
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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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Back-Cover Texts. A copy of the license is included in the
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section entitled ``GNU Free Documentation License''.
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man end-->
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<style type="text/css"><!--
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--></style>
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</head>
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<body>
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<div class="node">
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<p>
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<a name="SH64_002dAddressing"></a>Previous: <a rel="previous" accesskey="p" href="SH64_002dRegs.html#SH64_002dRegs">SH64-Regs</a>,
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Up: <a rel="up" accesskey="u" href="SH64-Syntax.html#SH64-Syntax">SH64 Syntax</a>
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<hr><br>
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</div>
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<h5 class="subsubsection">9.29.2.3 Addressing Modes</h5>
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<p><a name="index-addressing-modes_002c-SH64-1483"></a><a name="index-SH64-addressing-modes-1484"></a>
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SH64 operands consist of either a register or immediate value. The
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immediate value can be a constant or label reference (or portion of a
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label reference), as in this example:
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<pre class="example"> movi 4,r2
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pt function, tr4
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movi (function >> 16) & 65535,r0
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shori function & 65535, r0
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ld.l r0,4,r0
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</pre>
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<p><a name="index-datalabel_002c-SH64-1485"></a>Instruction label references can reference labels in either SHmedia or
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SHcompact. To differentiate between the two, labels in SHmedia sections
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will always have the least significant bit set (i.e. they will be odd),
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which SHcompact labels will have the least significant bit reset
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(i.e. they will be even). If you need to reference the actual address
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of a label, you can use the <code>datalabel</code> modifier, as in this
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example:
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<pre class="example"> .long function
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.long datalabel function
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</pre>
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<p>In that example, the first longword may or may not have the least
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significant bit set depending on whether the label is an SHmedia label
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or an SHcompact label. The second longword will be the actual address
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of the label, regardless of what type of label it is.
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</body></html>
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