1<html lang="en"> 2<head> 3<title>Byte Order - Debugging with GDB</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Debugging with GDB"> 6<meta name="generator" content="makeinfo 4.13"> 7<link title="Top" rel="start" href="index.html#Top"> 8<link rel="up" href="Targets.html#Targets" title="Targets"> 9<link rel="prev" href="Target-Commands.html#Target-Commands" title="Target Commands"> 10<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 11<!-- 12Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 131998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 14Free Software Foundation, Inc. 15 16Permission is granted to copy, distribute and/or modify this document 17under the terms of the GNU Free Documentation License, Version 1.3 or 18any later version published by the Free Software Foundation; with the 19Invariant Sections being ``Free Software'' and ``Free Software Needs 20Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,'' 21and with the Back-Cover Texts as in (a) below. 22 23(a) The FSF's Back-Cover Text is: ``You are free to copy and modify 24this GNU Manual. Buying copies from GNU Press supports the FSF in 25developing GNU and promoting software freedom.''--> 26<meta http-equiv="Content-Style-Type" content="text/css"> 27<style type="text/css"><!-- 28 pre.display { font-family:inherit } 29 pre.format { font-family:inherit } 30 pre.smalldisplay { font-family:inherit; font-size:smaller } 31 pre.smallformat { font-family:inherit; font-size:smaller } 32 pre.smallexample { font-size:smaller } 33 pre.smalllisp { font-size:smaller } 34 span.sc { font-variant:small-caps } 35 span.roman { font-family:serif; font-weight:normal; } 36 span.sansserif { font-family:sans-serif; font-weight:normal; } 37--></style> 38<link rel="stylesheet" type="text/css" href="../cs.css"> 39</head> 40<body> 41<div class="node"> 42<a name="Byte-Order"></a> 43<p> 44Previous: <a rel="previous" accesskey="p" href="Target-Commands.html#Target-Commands">Target Commands</a>, 45Up: <a rel="up" accesskey="u" href="Targets.html#Targets">Targets</a> 46<hr> 47</div> 48 49<h3 class="section">19.3 Choosing Target Byte Order</h3> 50 51<p><a name="index-choosing-target-byte-order-1056"></a><a name="index-target-byte-order-1057"></a> 52Some types of processors, such as the MIPS, PowerPC, and Renesas SH, 53offer the ability to run either big-endian or little-endian byte 54orders. Usually the executable or symbol will include a bit to 55designate the endian-ness, and you will not need to worry about 56which to use. However, you may still find it useful to adjust 57<span class="sc">gdb</span>'s idea of processor endian-ness manually. 58 59 60<a name="index-set-endian-1058"></a> 61<dl><dt><code>set endian big</code><dd>Instruct <span class="sc">gdb</span> to assume the target is big-endian. 62 63 <br><dt><code>set endian little</code><dd>Instruct <span class="sc">gdb</span> to assume the target is little-endian. 64 65 <br><dt><code>set endian auto</code><dd>Instruct <span class="sc">gdb</span> to use the byte order associated with the 66executable. 67 68 <br><dt><code>show endian</code><dd>Display <span class="sc">gdb</span>'s current idea of the target byte order. 69 70 </dl> 71 72 <p>Note that these commands merely adjust interpretation of symbolic 73data on the host, and that they have absolutely no effect on the 74target system. 75 76 </body></html> 77 78