150 lines
4.9 KiB
HTML
150 lines
4.9 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This file documents the GNU Assembler "as".
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Copyright (C) 1991-2016 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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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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-->
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Using as: LM32-Modifiers</title>
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<meta name="description" content="Using as: LM32-Modifiers">
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<meta name="keywords" content="Using as: LM32-Modifiers">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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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="LM32-Syntax.html#LM32-Syntax" rel="up" title="LM32 Syntax">
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<link href="LM32_002dChars.html#LM32_002dChars" rel="next" title="LM32-Chars">
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<link href="LM32_002dRegs.html#LM32_002dRegs" rel="prev" title="LM32-Regs">
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</style>
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="LM32_002dModifiers"></a>
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<div class="header">
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<p>
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Next: <a href="LM32_002dChars.html#LM32_002dChars" accesskey="n" rel="next">LM32-Chars</a>, Previous: <a href="LM32_002dRegs.html#LM32_002dRegs" accesskey="p" rel="prev">LM32-Regs</a>, Up: <a href="LM32-Syntax.html#LM32-Syntax" accesskey="u" rel="up">LM32 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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</div>
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<hr>
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<a name="Relocatable-Expression-Modifiers-1"></a>
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<h4 class="subsubsection">9.20.2.2 Relocatable Expression Modifiers</h4>
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<a name="index-LM32-modifiers"></a>
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<a name="index-syntax_002c-LM32"></a>
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<p>The assembler supports several modifiers when using relocatable addresses
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in LM32 instruction operands. The general syntax is the following:
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</p>
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<div class="smallexample">
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<pre class="smallexample">modifier(relocatable-expression)
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</pre></div>
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<dl compact="compact">
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<dd><a name="index-symbol-modifiers-1"></a>
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</dd>
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<dt><code>lo</code></dt>
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<dd>
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<p>This modifier allows you to use bits 0 through 15 of
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an address expression as 16 bit relocatable expression.
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</p>
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</dd>
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<dt><code>hi</code></dt>
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<dd>
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<p>This modifier allows you to use bits 16 through 23 of an address expression
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as 16 bit relocatable expression.
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</p>
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<p>For example
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</p>
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<div class="smallexample">
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<pre class="smallexample">ori r4, r4, lo(sym+10)
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orhi r4, r4, hi(sym+10)
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</pre></div>
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</dd>
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<dt><code>gp</code></dt>
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<dd>
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<p>This modified creates a 16-bit relocatable expression that is
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the offset of the symbol from the global pointer.
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</p>
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<div class="smallexample">
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<pre class="smallexample">mva r4, gp(sym)
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</pre></div>
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</dd>
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<dt><code>got</code></dt>
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<dd>
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<p>This modifier places a symbol in the GOT and creates a 16-bit
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relocatable expression that is the offset into the GOT of this
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symbol.
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</p>
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<div class="smallexample">
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<pre class="smallexample">lw r4, (gp+got(sym))
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</pre></div>
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</dd>
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<dt><code>gotofflo16</code></dt>
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<dd>
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<p>This modifier allows you to use the bits 0 through 15 of an
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address which is an offset from the GOT.
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</p>
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</dd>
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<dt><code>gotoffhi16</code></dt>
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<dd>
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<p>This modifier allows you to use the bits 16 through 31 of an
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address which is an offset from the GOT.
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</p>
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<div class="smallexample">
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<pre class="smallexample">orhi r4, r4, gotoffhi16(lsym)
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addi r4, r4, gotofflo16(lsym)
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</pre></div>
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</dd>
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</dl>
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</body>
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</html>
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