110 lines
4.5 KiB
HTML
110 lines
4.5 KiB
HTML
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||
|
|
<html>
|
||
|
|
<!-- This file documents the GNU Assembler "as".
|
||
|
|
|
||
|
|
Copyright (C) 1991-2016 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 1.3
|
||
|
|
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".
|
||
|
|
-->
|
||
|
|
<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
|
||
|
|
<head>
|
||
|
|
<title>Using as: MIPS insn</title>
|
||
|
|
|
||
|
|
<meta name="description" content="Using as: MIPS insn">
|
||
|
|
<meta name="keywords" content="Using as: MIPS insn">
|
||
|
|
<meta name="resource-type" content="document">
|
||
|
|
<meta name="distribution" content="global">
|
||
|
|
<meta name="Generator" content="makeinfo">
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
||
|
|
<link href="index.html#Top" rel="start" title="Top">
|
||
|
|
<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
|
||
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
||
|
|
<link href="MIPS_002dDependent.html#MIPS_002dDependent" rel="up" title="MIPS-Dependent">
|
||
|
|
<link href="MIPS-FP-ABIs.html#MIPS-FP-ABIs" rel="next" title="MIPS FP ABIs">
|
||
|
|
<link href="MIPS-autoextend.html#MIPS-autoextend" rel="prev" title="MIPS autoextend">
|
||
|
|
<style type="text/css">
|
||
|
|
<!--
|
||
|
|
a.summary-letter {text-decoration: none}
|
||
|
|
blockquote.smallquotation {font-size: smaller}
|
||
|
|
div.display {margin-left: 3.2em}
|
||
|
|
div.example {margin-left: 3.2em}
|
||
|
|
div.indentedblock {margin-left: 3.2em}
|
||
|
|
div.lisp {margin-left: 3.2em}
|
||
|
|
div.smalldisplay {margin-left: 3.2em}
|
||
|
|
div.smallexample {margin-left: 3.2em}
|
||
|
|
div.smallindentedblock {margin-left: 3.2em; font-size: smaller}
|
||
|
|
div.smalllisp {margin-left: 3.2em}
|
||
|
|
kbd {font-style:oblique}
|
||
|
|
pre.display {font-family: inherit}
|
||
|
|
pre.format {font-family: inherit}
|
||
|
|
pre.menu-comment {font-family: serif}
|
||
|
|
pre.menu-preformatted {font-family: serif}
|
||
|
|
pre.smalldisplay {font-family: inherit; font-size: smaller}
|
||
|
|
pre.smallexample {font-size: smaller}
|
||
|
|
pre.smallformat {font-family: inherit; font-size: smaller}
|
||
|
|
pre.smalllisp {font-size: smaller}
|
||
|
|
span.nocodebreak {white-space:nowrap}
|
||
|
|
span.nolinebreak {white-space:nowrap}
|
||
|
|
span.roman {font-family:serif; font-weight:normal}
|
||
|
|
span.sansserif {font-family:sans-serif; font-weight:normal}
|
||
|
|
ul.no-bullet {list-style: none}
|
||
|
|
-->
|
||
|
|
</style>
|
||
|
|
|
||
|
|
|
||
|
|
</head>
|
||
|
|
|
||
|
|
<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
|
||
|
|
<a name="MIPS-insn"></a>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
Next: <a href="MIPS-FP-ABIs.html#MIPS-FP-ABIs" accesskey="n" rel="next">MIPS FP ABIs</a>, Previous: <a href="MIPS-autoextend.html#MIPS-autoextend" accesskey="p" rel="prev">MIPS autoextend</a>, Up: <a href="MIPS_002dDependent.html#MIPS_002dDependent" accesskey="u" rel="up">MIPS-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>
|
||
|
|
</div>
|
||
|
|
<hr>
|
||
|
|
<a name="Directive-to-mark-data-as-an-instruction"></a>
|
||
|
|
<h4 class="subsection">9.27.8 Directive to mark data as an instruction</h4>
|
||
|
|
|
||
|
|
<a name="index-_002einsn"></a>
|
||
|
|
<p>The <code>.insn</code> directive tells <code>as</code> that the following
|
||
|
|
data is actually instructions. This makes a difference in MIPS 16 and
|
||
|
|
microMIPS modes: when loading the address of a label which precedes
|
||
|
|
instructions, <code>as</code> automatically adds 1 to the value, so
|
||
|
|
that jumping to the loaded address will do the right thing.
|
||
|
|
</p>
|
||
|
|
<a name="index-_002eglobal"></a>
|
||
|
|
<p>The <code>.global</code> and <code>.globl</code> directives supported by
|
||
|
|
<code>as</code> will by default mark the symbol as pointing to a
|
||
|
|
region of data not code. This means that, for example, any
|
||
|
|
instructions following such a symbol will not be disassembled by
|
||
|
|
<code>objdump</code> as it will regard them as data. To change this
|
||
|
|
behavior an optional section name can be placed after the symbol name
|
||
|
|
in the <code>.global</code> directive. If this section exists and is known
|
||
|
|
to be a code section, then the symbol will be marked as pointing at
|
||
|
|
code not data. Ie the syntax for the directive is:
|
||
|
|
</p>
|
||
|
|
<p><code>.global <var>symbol</var>[ <var>section</var>][, <var>symbol</var>[ <var>section</var>]] ...</code>,
|
||
|
|
</p>
|
||
|
|
<p>Here is a short example:
|
||
|
|
</p>
|
||
|
|
<div class="example">
|
||
|
|
<pre class="example"> .global foo .text, bar, baz .data
|
||
|
|
foo:
|
||
|
|
nop
|
||
|
|
bar:
|
||
|
|
.word 0x0
|
||
|
|
baz:
|
||
|
|
.word 0x1
|
||
|
|
|
||
|
|
</pre></div>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|