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94 lines
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<title>Branch Trace Configuration Format - Debugging with GDB</title>
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<a name="Branch-Trace-Configuration-Format"></a>
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Previous: <a rel="previous" accesskey="p" href="Branch-Trace-Format.html#Branch-Trace-Format">Branch Trace Format</a>,
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Up: <a rel="up" accesskey="u" href="Remote-Protocol.html#Remote-Protocol">Remote Protocol</a>
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<h3 class="section">E.20 Branch Trace Configuration Format</h3>
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<p><a name="index-branch-trace-configuration-format-3637"></a>
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For each inferior thread, <span class="sc">gdb</span> can obtain the branch trace
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configuration using the ‘<samp><span class="samp">qXfer:btrace-conf:read</span></samp>’
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(see <a href="qXfer-btrace_002dconf-read.html#qXfer-btrace_002dconf-read">qXfer btrace-conf read</a>) packet.
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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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<dl>
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<dt><code>bts</code><dd>This thread uses the <dfn>Branch Trace Store</dfn> (<acronym>BTS</acronym>) format.
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<dl>
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<dt><code>size</code><dd>The size of the <acronym>BTS</acronym> ring buffer in bytes.
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</dl>
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<br><dt><code>pt</code><dd>This thread uses the <dfn>Intel Processor Trace</dfn> (<acronym>Intel
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PT</acronym>) format.
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<dl>
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<dt><code>size</code><dd>The size of the <acronym>Intel PT</acronym> ring buffer in bytes.
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</dl>
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</dl>
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<p><span class="sc">gdb</span> must be linked with the Expat library to support XML
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branch trace configuration discovery. See <a href="Expat.html#Expat">Expat</a>.
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<p>The formal DTD for the branch trace configuration format is given below:
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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>
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