visus
/
toolchain-gcc-arm-embedded

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<!-- Copyright (C) 1988-2020 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 the
Invariant Sections being "Free Software" and "Free Software Needs
Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
and with the Back-Cover Texts as in (a) below.

(a) The FSF's Back-Cover Text is: "You are free to copy and modify
this GNU Manual.  Buying copies from GNU Press supports the FSF in
developing GNU and promoting software freedom." -->
<!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ -->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>PowerPC (Debugging with GDB)</title>

<meta name="description" content="PowerPC (Debugging with GDB)">
<meta name="keywords" content="PowerPC (Debugging with GDB)">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="makeinfo">
<link href="index.html#Top" rel="start" title="Top">
<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
<link href="Architectures.html#Architectures" rel="up" title="Architectures">
<link href="Nios-II.html#Nios-II" rel="next" title="Nios II">
<link href="HPPA.html#HPPA" rel="prev" title="HPPA">
<style type="text/css">
<!--
a.summary-letter {text-decoration: none}
blockquote.indentedblock {margin-right: 0em}
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
blockquote.smallquotation {font-size: smaller}
div.display {margin-left: 3.2em}
div.example {margin-left: 3.2em}
div.lisp {margin-left: 3.2em}
div.smalldisplay {margin-left: 3.2em}
div.smallexample {margin-left: 3.2em}
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.nolinebreak {white-space: nowrap}
span.roman {font-family: initial; font-weight: normal}
span.sansserif {font-family: sans-serif; font-weight: normal}
ul.no-bullet {list-style: none}
-->
</style>


</head>

<body lang="en">
<a name="PowerPC"></a>
<div class="header">
<p>
Next: <a href="Nios-II.html#Nios-II" accesskey="n" rel="next">Nios II</a>, Previous: <a href="HPPA.html#HPPA" accesskey="p" rel="prev">HPPA</a>, Up: <a href="Architectures.html#Architectures" accesskey="u" rel="up">Architectures</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="PowerPC-1"></a>
<h4 class="subsection">21.4.6 PowerPC</h4>
<a name="index-PowerPC-architecture"></a>

<p>When <small>GDB</small> is debugging the PowerPC architecture, it provides a set of 
pseudo-registers to enable inspection of 128-bit wide Decimal Floating Point
numbers stored in the floating point registers. These values must be stored
in two consecutive registers, always starting at an even register like
<code>f0</code> or <code>f2</code>.
</p>
<p>The pseudo-registers go from <code>$dl0</code> through <code>$dl15</code>, and are formed
by joining the even/odd register pairs <code>f0</code> and <code>f1</code> for <code>$dl0</code>,
<code>f2</code> and <code>f3</code> for <code>$dl1</code> and so on.
</p>
<p>For POWER7 processors, <small>GDB</small> provides a set of pseudo-registers, the 64-bit
wide Extended Floating Point Registers (&lsquo;<samp>f32</samp>&rsquo; through &lsquo;<samp>f63</samp>&rsquo;).
</p>


</body>
</html>