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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>Branch Trace Configuration Format (Debugging with GDB)</title>
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<meta name="description" content="Branch Trace Configuration Format (Debugging with GDB)">
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<meta name="keywords" content="Branch Trace Configuration Format (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="Remote-Protocol.html#Remote-Protocol" rel="up" title="Remote Protocol">
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<link href="Agent-Expressions.html#Agent-Expressions" rel="next" title="Agent Expressions">
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<link href="Branch-Trace-Format.html#Branch-Trace-Format" rel="prev" title="Branch Trace Format">
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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="Branch-Trace-Configuration-Format"></a>
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<div class="header">
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<p>
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Previous: <a href="Branch-Trace-Format.html#Branch-Trace-Format" accesskey="p" rel="prev">Branch Trace Format</a>, Up: <a href="Remote-Protocol.html#Remote-Protocol" accesskey="u" rel="up">Remote Protocol</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="Branch-Trace-Configuration-Format-1"></a>
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<h3 class="section">E.20 Branch Trace Configuration Format</h3>
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<a name="index-branch-trace-configuration-format"></a>
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<p>For each inferior thread, <small>GDB</small> can obtain the branch trace
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configuration using the ‘<samp>qXfer:btrace-conf:read</samp>’
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(see <a href="General-Query-Packets.html#qXfer-btrace_002dconf-read">qXfer btrace-conf read</a>) packet.
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</p>
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<p>The configuration describes the branch trace format and configuration
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settings for that format. The following information is described:
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</p>
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<dl compact="compact">
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<dt><code>bts</code></dt>
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<dd><p>This thread uses the <em>Branch Trace Store</em> (<acronym>BTS</acronym>) format.
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</p><dl compact="compact">
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<dt><code>size</code></dt>
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<dd><p>The size of the <acronym>BTS</acronym> ring buffer in bytes.
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</p></dd>
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</dl>
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</dd>
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<dt><code>pt</code></dt>
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<dd><p>This thread uses the <em>Intel Processor Trace</em> (<acronym>Intel
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PT</acronym>) format.
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</p><dl compact="compact">
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<dt><code>size</code></dt>
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<dd><p>The size of the <acronym>Intel PT</acronym> ring buffer in bytes.
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</p></dd>
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</dl>
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</dd>
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</dl>
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<p><small>GDB</small> must be linked with the Expat library to support XML
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branch trace configuration discovery. See <a href="Requirements.html#Expat">Expat</a>.
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</p>
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<p>The formal DTD for the branch trace configuration format is given below:
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</p>
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<div class="smallexample">
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<pre class="smallexample"><!ELEMENT btrace-conf (bts?, pt?)>
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<!ATTLIST btrace-conf version CDATA #FIXED "1.0">
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<!ELEMENT bts EMPTY>
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<!ATTLIST bts size CDATA #IMPLIED>
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<!ELEMENT pt EMPTY>
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<!ATTLIST pt size CDATA #IMPLIED>
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</pre></div>
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</body>
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</html>
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