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diff --git a/share/doc/gdb/Target-Descriptions.html b/share/doc/gdb/Target-Descriptions.html new file mode 100644 index 0000000..cb7f698 --- /dev/null +++ b/share/doc/gdb/Target-Descriptions.html @@ -0,0 +1,125 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1988-2023 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 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>Debugging with GDB: Target Descriptions</title> + +<meta name="description" content="Debugging with GDB: Target Descriptions"> +<meta name="keywords" content="Debugging with GDB: Target Descriptions"> +<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="index.html#Top" rel="up" title="Top"> +<link href="Retrieving-Descriptions.html#Retrieving-Descriptions" rel="next" title="Retrieving Descriptions"> +<link href="Rationale.html#Rationale" rel="previous" title="Rationale"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +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.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Target-Descriptions"></a> +<div class="header"> +<p> +Next: <a href="Operating-System-Information.html#Operating-System-Information" accesskey="n" rel="next">Operating System Information</a>, Previous: <a href="Agent-Expressions.html#Agent-Expressions" accesskey="p" rel="previous">Agent Expressions</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</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="Target-Descriptions-1"></a> +<h2 class="appendix">Appendix G Target Descriptions</h2> +<a name="index-target-descriptions"></a> + +<p>One of the challenges of using <small>GDB</small> to debug embedded systems +is that there are so many minor variants of each processor +architecture in use. It is common practice for vendors to start with +a standard processor core — ARM, PowerPC, or <acronym>MIPS</acronym>, for example — +and then make changes to adapt it to a particular market niche. Some +architectures have hundreds of variants, available from dozens of +vendors. This leads to a number of problems: +</p> +<ul> +<li> With so many different customized processors, it is difficult for +the <small>GDB</small> maintainers to keep up with the changes. +</li><li> Since individual variants may have short lifetimes or limited +audiences, it may not be worthwhile to carry information about every +variant in the <small>GDB</small> source tree. +</li><li> When <small>GDB</small> does support the architecture of the embedded system +at hand, the task of finding the correct architecture name to give the +<code>set architecture</code> command can be error-prone. +</li></ul> + +<p>To address these problems, the <small>GDB</small> remote protocol allows a +target system to not only identify itself to <small>GDB</small>, but to +actually describe its own features. This lets <small>GDB</small> support +processor variants it has never seen before — to the extent that the +descriptions are accurate, and that <small>GDB</small> understands them. +</p> +<p><small>GDB</small> must be linked with the Expat library to support XML +target descriptions. See <a href="Requirements.html#Expat">Expat</a>. +</p> +<table class="menu" border="0" cellspacing="0"> +<tr><td align="left" valign="top">• <a href="Retrieving-Descriptions.html#Retrieving-Descriptions" accesskey="1">Retrieving Descriptions</a>:</td><td> </td><td align="left" valign="top">How descriptions are fetched from a target. +</td></tr> +<tr><td align="left" valign="top">• <a href="Target-Description-Format.html#Target-Description-Format" accesskey="2">Target Description Format</a>:</td><td> </td><td align="left" valign="top">The contents of a target description. +</td></tr> +<tr><td align="left" valign="top">• <a href="Predefined-Target-Types.html#Predefined-Target-Types" accesskey="3">Predefined Target Types</a>:</td><td> </td><td align="left" valign="top">Standard types available for target + descriptions. +</td></tr> +<tr><td align="left" valign="top">• <a href="Enum-Target-Types.html#Enum-Target-Types" accesskey="4">Enum Target Types</a>:</td><td> </td><td align="left" valign="top">How to define enum target types. +</td></tr> +<tr><td align="left" valign="top">• <a href="Standard-Target-Features.html#Standard-Target-Features" accesskey="5">Standard Target Features</a>:</td><td> </td><td align="left" valign="top">Features <small>GDB</small> knows about. +</td></tr> +</table> + +<hr> +<div class="header"> +<p> +Next: <a href="Operating-System-Information.html#Operating-System-Information" accesskey="n" rel="next">Operating System Information</a>, Previous: <a href="Agent-Expressions.html#Agent-Expressions" accesskey="p" rel="previous">Agent Expressions</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</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> + + + +</body> +</html> |