<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <!-- Copyright (C) 1988-2019 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 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 6.4, http://www.gnu.org/software/texinfo/ --> <head> <title>Byte Order (Debugging with GDB)</title> <meta name="description" content="Byte Order (Debugging with GDB)"> <meta name="keywords" content="Byte Order (Debugging with GDB)"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="makeinfo"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <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="Targets.html#Targets" rel="up" title="Targets"> <link href="Remote-Debugging.html#Remote-Debugging" rel="next" title="Remote Debugging"> <link href="Target-Commands.html#Target-Commands" rel="prev" title="Target Commands"> <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="Byte-Order"></a> <div class="header"> <p> Previous: <a href="Target-Commands.html#Target-Commands" accesskey="p" rel="prev">Target Commands</a>, Up: <a href="Targets.html#Targets" accesskey="u" rel="up">Targets</a> [<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="Choosing-Target-Byte-Order"></a> <h3 class="section">19.3 Choosing Target Byte Order</h3> <a name="index-choosing-target-byte-order"></a> <a name="index-target-byte-order"></a> <p>Some types of processors, such as the <acronym>MIPS</acronym>, PowerPC, and Renesas SH, offer the ability to run either big-endian or little-endian byte orders. Usually the executable or symbol will include a bit to designate the endian-ness, and you will not need to worry about which to use. However, you may still find it useful to adjust <small>GDB</small>’s idea of processor endian-ness manually. </p> <dl compact="compact"> <dd><a name="index-set-endian"></a> </dd> <dt><code>set endian big</code></dt> <dd><p>Instruct <small>GDB</small> to assume the target is big-endian. </p> </dd> <dt><code>set endian little</code></dt> <dd><p>Instruct <small>GDB</small> to assume the target is little-endian. </p> </dd> <dt><code>set endian auto</code></dt> <dd><p>Instruct <small>GDB</small> to use the byte order associated with the executable. </p> </dd> <dt><code>show endian</code></dt> <dd><p>Display <small>GDB</small>’s current idea of the target byte order. </p> </dd> </dl> <p>If the <code>set endian auto</code> mode is in effect and no executable has been selected, then the endianness used is the last one chosen either by one of the <code>set endian big</code> and <code>set endian little</code> commands or by inferring from the last executable used. If no endianness has been previously chosen, then the default for this mode is inferred from the target <small>GDB</small> has been built for, and is <code>little</code> if the name of the target CPU has an <code>el</code> suffix and <code>big</code> otherwise. </p> <p>Note that these commands merely adjust interpretation of symbolic data on the host, and that they have absolutely no effect on the target system. </p> </body> </html>