<html lang="en">
<head>
<title>PowerPC - Debugging with GDB</title>
<meta http-equiv="Content-Type" content="text/html">
<meta name="description" content="Debugging with GDB">
<meta name="generator" content="makeinfo 4.13">
<link title="Top" rel="start" href="index.html#Top">
<link rel="up" href="Architectures.html#Architectures" title="Architectures">
<link rel="prev" href="SPU.html#SPU" title="SPU">
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
<!--
Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
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.''-->
<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>
<link rel="stylesheet" type="text/css" href="../cs.css">
</head>
<body>
<div class="node">
<a name="PowerPC"></a>
<p>
Previous:&nbsp;<a rel="previous" accesskey="p" href="SPU.html#SPU">SPU</a>,
Up:&nbsp;<a rel="up" accesskey="u" href="Architectures.html#Architectures">Architectures</a>
<hr>
</div>

<h4 class="subsection">21.4.7 PowerPC</h4>

<p><a name="index-PowerPC-architecture-1428"></a>
When <span class="sc">gdb</span> 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>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>For POWER7 processors, <span class="sc">gdb</span> provides a set of pseudo-registers, the 64-bit
wide Extended Floating Point Registers (&lsquo;<samp><span class="samp">f32</span></samp>&rsquo; through &lsquo;<samp><span class="samp">f63</span></samp>&rsquo;).

   </body></html>