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123 lines
4.9 KiB
HTML
123 lines
4.9 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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this GNU Manual. Buying copies from GNU Press supports the FSF in
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developing GNU and promoting software freedom." -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Byte Order (Debugging with GDB)</title>
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<meta name="description" content="Byte Order (Debugging with GDB)">
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<meta name="keywords" content="Byte Order (Debugging with GDB)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Targets.html#Targets" rel="up" title="Targets">
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<link href="Remote-Debugging.html#Remote-Debugging" rel="next" title="Remote Debugging">
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<link href="Target-Commands.html#Target-Commands" rel="prev" title="Target Commands">
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<style type="text/css">
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Byte-Order"></a>
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<div class="header">
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<p>
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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>
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</div>
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<hr>
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<a name="Choosing-Target-Byte-Order"></a>
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<h3 class="section">19.3 Choosing Target Byte Order</h3>
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<a name="index-choosing-target-byte-order"></a>
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<a name="index-target-byte-order"></a>
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<p>Some types of processors, such as the <acronym>MIPS</acronym>, PowerPC, and Renesas SH,
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offer the ability to run either big-endian or little-endian byte
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orders. Usually the executable or symbol will include a bit to
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designate the endian-ness, and you will not need to worry about
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which to use. However, you may still find it useful to adjust
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<small>GDB</small>’s idea of processor endian-ness manually.
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</p>
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<dl compact="compact">
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<dd><a name="index-set-endian"></a>
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</dd>
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<dt><code>set endian big</code></dt>
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<dd><p>Instruct <small>GDB</small> to assume the target is big-endian.
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</p>
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</dd>
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<dt><code>set endian little</code></dt>
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<dd><p>Instruct <small>GDB</small> to assume the target is little-endian.
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</p>
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</dd>
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<dt><code>set endian auto</code></dt>
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<dd><p>Instruct <small>GDB</small> to use the byte order associated with the
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executable.
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</p>
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</dd>
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<dt><code>show endian</code></dt>
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<dd><p>Display <small>GDB</small>’s current idea of the target byte order.
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</p>
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</dd>
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</dl>
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<p>If the <code>set endian auto</code> mode is in effect and no executable has
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been selected, then the endianness used is the last one chosen either
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by one of the <code>set endian big</code> and <code>set endian little</code>
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commands or by inferring from the last executable used. If no
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endianness has been previously chosen, then the default for this mode
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is inferred from the target <small>GDB</small> has been built for, and is
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<code>little</code> if the name of the target CPU has an <code>el</code> suffix
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and <code>big</code> otherwise.
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</p>
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<p>Note that these commands merely adjust interpretation of symbolic
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data on the host, and that they have absolutely no effect on the
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target system.
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</p>
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</body>
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</html>
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