80 lines
3.7 KiB
HTML
80 lines
3.7 KiB
HTML
|
<html lang="en">
|
||
|
|
<head>
|
||
|
|
<title>Absolute Literals Directive - Using as</title>
|
||
|
|
<meta http-equiv="Content-Type" content="text/html">
|
||
|
|
<meta name="description" content="Using as">
|
||
|
|
<meta name="generator" content="makeinfo 4.13">
|
||
|
|
<link title="Top" rel="start" href="index.html#Top">
|
||
|
|
<link rel="up" href="Xtensa-Directives.html#Xtensa-Directives" title="Xtensa Directives">
|
||
|
|
<link rel="prev" href="Literal-Prefix-Directive.html#Literal-Prefix-Directive" title="Literal Prefix Directive">
|
||
|
|
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
|
||
|
|
<!--
|
||
|
|
This file documents the GNU Assembler "as".
|
||
|
|
|
||
|
|
Copyright (C) 1991-2019 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''.
|
||
|
|
|
||
|
|
-->
|
||
|
|
<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; }
|
||
|
|
span.sansserif { font-family:sans-serif; font-weight:normal; }
|
||
|
|
--></style>
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
<div class="node">
|
||
|
|
<a name="Absolute-Literals-Directive"></a>
|
||
|
|
<p>
|
||
|
|
Previous: <a rel="previous" accesskey="p" href="Literal-Prefix-Directive.html#Literal-Prefix-Directive">Literal Prefix Directive</a>,
|
||
|
|
Up: <a rel="up" accesskey="u" href="Xtensa-Directives.html#Xtensa-Directives">Xtensa Directives</a>
|
||
|
|
<hr>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
<h5 class="subsubsection">9.55.5.7 absolute-literals</h5>
|
||
|
|
|
||
|
|
<p><a name="index-g_t_0040code_007babsolute_002dliterals_007d-directive-2665"></a><a name="index-g_t_0040code_007bno_002dabsolute_002dliterals_007d-directive-2666"></a>
|
||
|
|
The <code>absolute-literals</code> and <code>no-absolute-literals</code>
|
||
|
|
directives control the absolute vs. PC-relative mode for <code>L32R</code>
|
||
|
|
instructions. These are relevant only for Xtensa configurations that
|
||
|
|
include the absolute addressing option for <code>L32R</code> instructions.
|
||
|
|
|
||
|
|
<pre class="smallexample"> .begin [no-]absolute-literals
|
||
|
|
.end [no-]absolute-literals
|
||
|
|
</pre>
|
||
|
|
<p>These directives do not change the <code>L32R</code> mode—they only cause
|
||
|
|
the assembler to emit the appropriate kind of relocation for <code>L32R</code>
|
||
|
|
instructions and to place the literal values in the appropriate section.
|
||
|
|
To change the <code>L32R</code> mode, the program must write the
|
||
|
|
<code>LITBASE</code> special register. It is the programmer's responsibility
|
||
|
|
to keep track of the mode and indicate to the assembler which mode is
|
||
|
|
used in each region of code.
|
||
|
|
|
||
|
|
<p>If the Xtensa configuration includes the absolute <code>L32R</code> addressing
|
||
|
|
option, the default is to assume absolute <code>L32R</code> addressing unless
|
||
|
|
the ‘<samp><span class="samp">--no-absolute-literals</span></samp>’ command-line option is specified.
|
||
|
|
Otherwise, the default is to assume PC-relative <code>L32R</code> addressing.
|
||
|
|
The <code>absolute-literals</code> directive can then be used to override
|
||
|
|
the default determined by the command-line options.
|
||
|
|
|
||
|
|
<!-- Local Variables: -->
|
||
|
|
<!-- fill-column: 72 -->
|
||
|
|
<!-- End: -->
|
||
|
|
<!-- Copyright (C) 2011-2019 Free Software Foundation, Inc. -->
|
||
|
|
<!-- This is part of the GAS manual. -->
|
||
|
|
<!-- For copying conditions, see the file as.texinfo. -->
|
||
|
|
</body></html>
|
||
|
|
|