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| <h3 class="section">E.20 Branch Trace Configuration Format</h3> |
| |
| <p><a name="index-branch-trace-configuration-format-3637"></a> |
| For each inferior thread, <span class="sc">gdb</span> can obtain the branch trace |
| configuration using the ‘<samp><span class="samp">qXfer:btrace-conf:read</span></samp>’ |
| (see <a href="qXfer-btrace_002dconf-read.html#qXfer-btrace_002dconf-read">qXfer btrace-conf read</a>) packet. |
| |
| <p>The configuration describes the branch trace format and configuration |
| settings for that format. The following information is described: |
| |
| <dl> |
| <dt><code>bts</code><dd>This thread uses the <dfn>Branch Trace Store</dfn> (<acronym>BTS</acronym>) format. |
| <dl> |
| <dt><code>size</code><dd>The size of the <acronym>BTS</acronym> ring buffer in bytes. |
| </dl> |
| <br><dt><code>pt</code><dd>This thread uses the <dfn>Intel Processor Trace</dfn> (<acronym>Intel |
| PT</acronym>) format. |
| <dl> |
| <dt><code>size</code><dd>The size of the <acronym>Intel PT</acronym> ring buffer in bytes. |
| </dl> |
| </dl> |
| |
| <p><span class="sc">gdb</span> must be linked with the Expat library to support XML |
| branch trace configuration discovery. See <a href="Expat.html#Expat">Expat</a>. |
| |
| <p>The formal DTD for the branch trace configuration format is given below: |
| |
| <pre class="smallexample"> <!ELEMENT btrace-conf (bts?, pt?)> |
| <!ATTLIST btrace-conf version CDATA #FIXED "1.0"> |
| |
| <!ELEMENT bts EMPTY> |
| <!ATTLIST bts size CDATA #IMPLIED> |
| |
| <!ELEMENT pt EMPTY> |
| <!ATTLIST pt size CDATA #IMPLIED> |
| </pre> |
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