neingeist
/
arduinisten
Archived
1
0
Fork 0
You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
This repo is archived. You can view files and clone it, but cannot push or open issues/pull-requests.

94 lines
4.9 KiB
HTML

<html lang="en">
<head>
<title>Directives-i960 - Using as</title>
<meta http-equiv="Content-Type" content="text/html">
<meta name="description" content="Using as">
<meta name="generator" content="makeinfo 4.7">
<link title="Top" rel="start" href="index.html#Top">
<link rel="up" href="i960_002dDependent.html#i960_002dDependent" title="i960-Dependent">
<link rel="prev" href="Floating-Point_002di960.html#Floating-Point_002di960" title="Floating Point-i960">
<link rel="next" href="Opcodes-for-i960.html#Opcodes-for-i960" title="Opcodes for i960">
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
<!--
This file documents the GNU Assembler "as".
Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
2006, 2007 Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.1
or any later version published by the Free Software Foundation;
with no Invariant Sections, with no Front-Cover Texts, and with no
Back-Cover Texts. A copy of the license is included in the
section entitled ``GNU Free Documentation License''.
man end-->
<meta http-equiv="Content-Style-Type" content="text/css">
<style type="text/css"><!--
pre.display { font-family:inherit }
pre.format { font-family:inherit }
pre.smalldisplay { font-family:inherit; font-size:smaller }
pre.smallformat { font-family:inherit; font-size:smaller }
pre.smallexample { font-size:smaller }
pre.smalllisp { font-size:smaller }
span.sc { font-variant:small-caps }
span.roman { font-family: serif; font-weight: normal; }
--></style>
</head>
<body>
<div class="node">
<p>
<a name="Directives_002di960"></a>Next:&nbsp;<a rel="next" accesskey="n" href="Opcodes-for-i960.html#Opcodes-for-i960">Opcodes for i960</a>,
Previous:&nbsp;<a rel="previous" accesskey="p" href="Floating-Point_002di960.html#Floating-Point_002di960">Floating Point-i960</a>,
Up:&nbsp;<a rel="up" accesskey="u" href="i960_002dDependent.html#i960_002dDependent">i960-Dependent</a>
<hr><br>
</div>
<h4 class="subsection">9.15.3 i960 Machine Directives</h4>
<p><a name="index-machine-directives_002c-i960-988"></a><a name="index-i960-machine-directives-989"></a>
<a name="index-_0040code_007bbss_007d-directive_002c-i960-990"></a>
<dl><dt><code>.bss </code><var>symbol</var><code>, </code><var>length</var><code>, </code><var>align</var><dd>Reserve <var>length</var> bytes in the bss section for a local <var>symbol</var>,
aligned to the power of two specified by <var>align</var>. <var>length</var> and
<var>align</var> must be positive absolute expressions. This directive
differs from <span class="samp">.lcomm</span> only in that it permits you to specify
an alignment. See <a href="Lcomm.html#Lcomm"><code>.lcomm</code></a>.
</dl>
<a name="index-_0040code_007bextended_007d-directive_002c-i960-991"></a>
<dl><dt><code>.extended </code><var>flonums</var><dd><code>.extended</code> expects zero or more flonums, separated by commas; for
each flonum, <span class="samp">.extended</span> emits an <span class="sc">ieee</span> extended-format (80-bit)
floating-point number.
<p><a name="index-_0040code_007bleafproc_007d-directive_002c-i960-992"></a><br><dt><code>.leafproc </code><var>call-lab</var><code>, </code><var>bal-lab</var><dd>You can use the <span class="samp">.leafproc</span> directive in conjunction with the
optimized <code>callj</code> instruction to enable faster calls of leaf
procedures. If a procedure is known to call no other procedures, you
may define an entry point that skips procedure prolog code (and that does
not depend on system-supplied saved context), and declare it as the
<var>bal-lab</var> using <span class="samp">.leafproc</span>. If the procedure also has an
entry point that goes through the normal prolog, you can specify that
entry point as <var>call-lab</var>.
<p>A <span class="samp">.leafproc</span> declaration is meant for use in conjunction with the
optimized call instruction <span class="samp">callj</span>; the directive records the data
needed later to choose between converting the <span class="samp">callj</span> into a
<code>bal</code> or a <code>call</code>.
<p><var>call-lab</var> is optional; if only one argument is present, or if the
two arguments are identical, the single argument is assumed to be the
<code>bal</code> entry point.
<p><a name="index-_0040code_007bsysproc_007d-directive_002c-i960-993"></a><br><dt><code>.sysproc </code><var>name</var><code>, </code><var>index</var><dd>The <span class="samp">.sysproc</span> directive defines a name for a system procedure.
After you define it using <span class="samp">.sysproc</span>, you can use <var>name</var> to
refer to the system procedure identified by <var>index</var> when calling
procedures with the optimized call instruction <span class="samp">callj</span>.
<p>Both arguments are required; <var>index</var> must be between 0 and 31
(inclusive).
</dl>
</body></html>