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128 lines
5.6 KiB
HTML
128 lines
5.6 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-Directives (Using as)</title>
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<meta name="description" content="M68HC11-Directives (Using as)">
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<meta name="keywords" content="M68HC11-Directives (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_002dFloat.html#M68HC11_002dFloat" rel="next" title="M68HC11-Float">
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<link href="M68HC11_002dModifiers.html#M68HC11_002dModifiers" rel="prev" title="M68HC11-Modifiers">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
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blockquote.smallquotation {font-size: smaller}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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pre.format {font-family: inherit}
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pre.menu-comment {font-family: serif}
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pre.smalldisplay {font-family: inherit; font-size: smaller}
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pre.smallexample {font-size: smaller}
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pre.smalllisp {font-size: smaller}
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span.nolinebreak {white-space: nowrap}
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ul.no-bullet {list-style: none}
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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_002dDirectives"></a>
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<div class="header">
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<p>
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Next: <a href="M68HC11_002dFloat.html#M68HC11_002dFloat" accesskey="n" rel="next">M68HC11-Float</a>, Previous: <a href="M68HC11_002dModifiers.html#M68HC11_002dModifiers" accesskey="p" rel="prev">M68HC11-Modifiers</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="Assembler-Directives-2"></a>
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<h4 class="subsection">9.22.4 Assembler Directives</h4>
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<a name="index-assembler-directives_002c-M68HC11"></a>
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<a name="index-assembler-directives_002c-M68HC12"></a>
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<a name="index-M68HC11-assembler-directives"></a>
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<a name="index-M68HC12-assembler-directives"></a>
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<p>The 68HC11 and 68HC12 version of <code>as</code> have the following
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specific assembler directives:
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</p>
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<dl compact="compact">
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<dt><code>.relax</code></dt>
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<dd><a name="index-assembler-directive-_002erelax_002c-M68HC11"></a>
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<a name="index-M68HC11-assembler-directive-_002erelax"></a>
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<p>The relax directive is used by the ‘<samp>GNU Compiler</samp>’ to emit a specific
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relocation to mark a group of instructions for linker relaxation.
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The sequence of instructions within the group must be known to the linker
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so that relaxation can be performed.
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</p>
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</dd>
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<dt><code>.mode [mshort|mlong|mshort-double|mlong-double]</code></dt>
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<dd><a name="index-assembler-directive-_002emode_002c-M68HC11"></a>
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<a name="index-M68HC11-assembler-directive-_002emode"></a>
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<p>This directive specifies the ABI. It overrides the ‘<samp>-mshort</samp>’,
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‘<samp>-mlong</samp>’, ‘<samp>-mshort-double</samp>’ and ‘<samp>-mlong-double</samp>’ options.
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</p>
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</dd>
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<dt><code>.far <var>symbol</var></code></dt>
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<dd><a name="index-assembler-directive-_002efar_002c-M68HC11"></a>
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<a name="index-M68HC11-assembler-directive-_002efar"></a>
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<p>This directive marks the symbol as a ‘<samp>far</samp>’ symbol meaning that it
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uses a ‘<samp>call/rtc</samp>’ calling convention as opposed to ‘<samp>jsr/rts</samp>’.
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During a final link, the linker will identify references to the ‘<samp>far</samp>’
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symbol and will verify the proper calling convention.
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</p>
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</dd>
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<dt><code>.interrupt <var>symbol</var></code></dt>
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<dd><a name="index-assembler-directive-_002einterrupt_002c-M68HC11"></a>
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<a name="index-M68HC11-assembler-directive-_002einterrupt"></a>
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<p>This directive marks the symbol as an interrupt entry point.
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This information is then used by the debugger to correctly unwind the
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frame across interrupts.
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</p>
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</dd>
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<dt><code>.xrefb <var>symbol</var></code></dt>
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<dd><a name="index-assembler-directive-_002exrefb_002c-M68HC11"></a>
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<a name="index-M68HC11-assembler-directive-_002exrefb"></a>
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<p>This directive is defined for compatibility with the
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‘<samp>Specification for Motorola 8 and 16-Bit Assembly Language Input
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Standard</samp>’ and is ignored.
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</p>
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</dd>
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</dl>
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</body>
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</html>
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