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<title>Debugging with GDB: Branch Trace Configuration Format</title>
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<a name="Branch-Trace-Configuration-Format"></a>
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Previous: <a href="Branch-Trace-Format.html#Branch-Trace-Format" accesskey="p" rel="previous">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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<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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