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146 lines
5.8 KiB
HTML
146 lines
5.8 KiB
HTML
4 years ago
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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) 1991-2019 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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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 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>M68HC11-Modifiers (Using as)</title>
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<meta name="description" content="M68HC11-Modifiers (Using as)">
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<meta name="keywords" content="M68HC11-Modifiers (Using as)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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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="M68HC11_002dDependent.html#M68HC11_002dDependent" rel="up" title="M68HC11-Dependent">
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<link href="M68HC11_002dDirectives.html#M68HC11_002dDirectives" rel="next" title="M68HC11-Directives">
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<link href="M68HC11_002dSyntax.html#M68HC11_002dSyntax" rel="prev" title="M68HC11-Syntax">
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-->
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</style>
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</head>
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<body lang="en">
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<a name="M68HC11_002dModifiers"></a>
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<div class="header">
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<p>
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Next: <a href="M68HC11_002dDirectives.html#M68HC11_002dDirectives" accesskey="n" rel="next">M68HC11-Directives</a>, Previous: <a href="M68HC11_002dSyntax.html#M68HC11_002dSyntax" accesskey="p" rel="prev">M68HC11-Syntax</a>, Up: <a href="M68HC11_002dDependent.html#M68HC11_002dDependent" accesskey="u" rel="up">M68HC11-Dependent</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="Symbolic-Operand-Modifiers-1"></a>
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<h4 class="subsection">9.22.3 Symbolic Operand Modifiers</h4>
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<a name="index-M68HC11-modifiers"></a>
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<a name="index-syntax_002c-M68HC11-1"></a>
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<p>The assembler supports several modifiers when using symbol addresses
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in 68HC11 and 68HC12 instruction operands. The general syntax is
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the following:
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</p>
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<div class="smallexample">
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<pre class="smallexample">%modifier(symbol)
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</pre></div>
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<dl compact="compact">
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<dd><a name="index-symbol-modifiers-3"></a>
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</dd>
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<dt><code>%addr</code></dt>
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<dd><p>This modifier indicates to the assembler and linker to use
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the 16-bit physical address corresponding to the symbol. This is intended
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to be used on memory window systems to map a symbol in the memory bank window.
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If the symbol is in a memory expansion part, the physical address
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corresponds to the symbol address within the memory bank window.
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If the symbol is not in a memory expansion part, this is the symbol address
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(using or not using the %addr modifier has no effect in that case).
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</p>
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</dd>
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<dt><code>%page</code></dt>
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<dd><p>This modifier indicates to use the memory page number corresponding
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to the symbol. If the symbol is in a memory expansion part, its page
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number is computed by the linker as a number used to map the page containing
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the symbol in the memory bank window. If the symbol is not in a memory
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expansion part, the page number is 0.
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</p>
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</dd>
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<dt><code>%hi</code></dt>
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<dd><p>This modifier indicates to use the 8-bit high part of the physical
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address of the symbol.
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</p>
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</dd>
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<dt><code>%lo</code></dt>
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<dd><p>This modifier indicates to use the 8-bit low part of the physical
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address of the symbol.
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</p>
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</dd>
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</dl>
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<p>For example a 68HC12 call to a function ‘<samp>foo_example</samp>’ stored in memory
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expansion part could be written as follows:
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</p>
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<div class="smallexample">
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<pre class="smallexample">call %addr(foo_example),%page(foo_example)
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</pre></div>
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<p>and this is equivalent to
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</p>
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<div class="smallexample">
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<pre class="smallexample">call foo_example
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</pre></div>
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<p>And for 68HC11 it could be written as follows:
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</p>
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<div class="smallexample">
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<pre class="smallexample">ldab #%page(foo_example)
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stab _page_switch
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jsr %addr(foo_example)
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</pre></div>
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<hr>
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<div class="header">
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<p>
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Next: <a href="M68HC11_002dDirectives.html#M68HC11_002dDirectives" accesskey="n" rel="next">M68HC11-Directives</a>, Previous: <a href="M68HC11_002dSyntax.html#M68HC11_002dSyntax" accesskey="p" rel="prev">M68HC11-Syntax</a>, Up: <a href="M68HC11_002dDependent.html#M68HC11_002dDependent" accesskey="u" rel="up">M68HC11-Dependent</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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</body>
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</html>
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