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) 1988-2013 Free Software Foundation, Inc. 13 14Permission is granted to copy, distribute and/or modify this document 15under the terms of the GNU Free Documentation License, Version 1.3 or 16any later version published by the Free Software Foundation; with the 17Invariant Sections being ``Free Software'' and ``Free Software Needs 18Free Documentation'', with the Front-Cover Texts being ``A GNU Manual,'' 19and with the Back-Cover Texts as in (a) below. 20 21(a) The FSF's Back-Cover Text is: ``You are free to copy and modify 22this GNU Manual. Buying copies from GNU Press supports the FSF in 23developing GNU and promoting software freedom.'' 24--> 25<meta http-equiv="Content-Style-Type" content="text/css"> 26<style type="text/css"><!-- 27 pre.display { font-family:inherit } 28 pre.format { font-family:inherit } 29 pre.smalldisplay { font-family:inherit; font-size:smaller } 30 pre.smallformat { font-family:inherit; font-size:smaller } 31 pre.smallexample { font-size:smaller } 32 pre.smalllisp { font-size:smaller } 33 span.sc { font-variant:small-caps } 34 span.roman { font-family:serif; font-weight:normal; } 35 span.sansserif { font-family:sans-serif; font-weight:normal; } 36--></style> 37<link rel="stylesheet" type="text/css" href="../cs.css"> 38</head> 39<body> 40<div class="node"> 41<a name="Byte-Order"></a> 42<p> 43Previous: <a rel="previous" accesskey="p" href="Target-Commands.html#Target-Commands">Target Commands</a>, 44Up: <a rel="up" accesskey="u" href="Targets.html#Targets">Targets</a> 45<hr> 46</div> 47 48<h3 class="section">19.3 Choosing Target Byte Order</h3> 49 50<p><a name="index-choosing-target-byte-order-1171"></a><a name="index-target-byte-order-1172"></a> 51Some types of processors, such as the <acronym>MIPS</acronym>, PowerPC, and Renesas SH, 52offer the ability to run either big-endian or little-endian byte 53orders. Usually the executable or symbol will include a bit to 54designate the endian-ness, and you will not need to worry about 55which to use. However, you may still find it useful to adjust 56<span class="sc">gdb</span>'s idea of processor endian-ness manually. 57 58 59<a name="index-set-endian-1173"></a> 60<dl><dt><code>set endian big</code><dd>Instruct <span class="sc">gdb</span> to assume the target is big-endian. 61 62 <br><dt><code>set endian little</code><dd>Instruct <span class="sc">gdb</span> to assume the target is little-endian. 63 64 <br><dt><code>set endian auto</code><dd>Instruct <span class="sc">gdb</span> to use the byte order associated with the 65executable. 66 67 <br><dt><code>show endian</code><dd>Display <span class="sc">gdb</span>'s current idea of the target byte order. 68 69 </dl> 70 71 <p>Note that these commands merely adjust interpretation of symbolic 72data on the host, and that they have absolutely no effect on the 73target system. 74 75 </body></html> 76 77