139 lines
6.5 KiB
HTML
139 lines
6.5 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: Directives-i960</title>
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<meta name="description" content="Using as: Directives-i960">
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<meta name="keywords" content="Using as: Directives-i960">
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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="i960_002dDependent.html#i960_002dDependent" rel="up" title="i960-Dependent">
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<link href="Opcodes-for-i960.html#Opcodes-for-i960" rel="next" title="Opcodes for i960">
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<link href="Floating-Point_002di960.html#Floating-Point_002di960" rel="prev" title="Floating Point-i960">
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-->
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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="Directives_002di960"></a>
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<div class="header">
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<p>
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Next: <a href="Opcodes-for-i960.html#Opcodes-for-i960" accesskey="n" rel="next">Opcodes for i960</a>, Previous: <a href="Floating-Point_002di960.html#Floating-Point_002di960" accesskey="p" rel="prev">Floating Point-i960</a>, Up: <a href="i960_002dDependent.html#i960_002dDependent" accesskey="u" rel="up">i960-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="i960-Machine-Directives"></a>
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<h4 class="subsection">9.17.3 i960 Machine Directives</h4>
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<a name="index-machine-directives_002c-i960"></a>
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<a name="index-i960-machine-directives"></a>
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<dl compact="compact">
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<dd><a name="index-bss-directive_002c-i960"></a>
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</dd>
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<dt><code>.bss <var>symbol</var>, <var>length</var>, <var>align</var></code></dt>
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<dd><p>Reserve <var>length</var> bytes in the bss section for a local <var>symbol</var>,
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aligned to the power of two specified by <var>align</var>. <var>length</var> and
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<var>align</var> must be positive absolute expressions. This directive
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differs from ‘<samp>.lcomm</samp>’ only in that it permits you to specify
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an alignment. See <a href="Lcomm.html#Lcomm"><code>.lcomm</code></a>.
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</p></dd>
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</dl>
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<dl compact="compact">
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<dd><a name="index-extended-directive_002c-i960"></a>
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</dd>
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<dt><code>.extended <var>flonums</var></code></dt>
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<dd><p><code>.extended</code> expects zero or more flonums, separated by commas; for
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each flonum, ‘<samp>.extended</samp>’ emits an <small>IEEE</small> extended-format (80-bit)
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floating-point number.
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</p>
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<a name="index-leafproc-directive_002c-i960"></a>
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</dd>
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<dt><code>.leafproc <var>call-lab</var>, <var>bal-lab</var></code></dt>
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<dd><p>You can use the ‘<samp>.leafproc</samp>’ directive in conjunction with the
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optimized <code>callj</code> instruction to enable faster calls of leaf
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procedures. If a procedure is known to call no other procedures, you
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may define an entry point that skips procedure prolog code (and that does
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not depend on system-supplied saved context), and declare it as the
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<var>bal-lab</var> using ‘<samp>.leafproc</samp>’. If the procedure also has an
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entry point that goes through the normal prolog, you can specify that
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entry point as <var>call-lab</var>.
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</p>
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<p>A ‘<samp>.leafproc</samp>’ declaration is meant for use in conjunction with the
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optimized call instruction ‘<samp>callj</samp>’; the directive records the data
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needed later to choose between converting the ‘<samp>callj</samp>’ into a
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<code>bal</code> or a <code>call</code>.
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</p>
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<p><var>call-lab</var> is optional; if only one argument is present, or if the
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two arguments are identical, the single argument is assumed to be the
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<code>bal</code> entry point.
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</p>
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<a name="index-sysproc-directive_002c-i960"></a>
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</dd>
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<dt><code>.sysproc <var>name</var>, <var>index</var></code></dt>
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<dd><p>The ‘<samp>.sysproc</samp>’ directive defines a name for a system procedure.
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After you define it using ‘<samp>.sysproc</samp>’, you can use <var>name</var> to
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refer to the system procedure identified by <var>index</var> when calling
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procedures with the optimized call instruction ‘<samp>callj</samp>’.
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</p>
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<p>Both arguments are required; <var>index</var> must be between 0 and 31
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(inclusive).
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</p></dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Opcodes-for-i960.html#Opcodes-for-i960" accesskey="n" rel="next">Opcodes for i960</a>, Previous: <a href="Floating-Point_002di960.html#Floating-Point_002di960" accesskey="p" rel="prev">Floating Point-i960</a>, Up: <a href="i960_002dDependent.html#i960_002dDependent" accesskey="u" rel="up">i960-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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