123 lines
5.9 KiB
HTML
123 lines
5.9 KiB
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<html lang="en">
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<head>
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<title>Trace File Format - Debugging with GDB</title>
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<meta name="description" content="Debugging with GDB">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="prev" href="Operating-System-Information.html#Operating-System-Information" title="Operating System Information">
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<link rel="next" href="Index-Section-Format.html#Index-Section-Format" title="Index Section Format">
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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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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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<div class="node">
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<a name="Trace-File-Format"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Index-Section-Format.html#Index-Section-Format">Index Section Format</a>,
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Previous: <a rel="previous" accesskey="p" href="Operating-System-Information.html#Operating-System-Information">Operating System Information</a>,
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Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a>
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<hr>
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</div>
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<h2 class="appendix">Appendix I Trace File Format</h2>
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<p><a name="index-trace-file-format-3678"></a>
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The trace file comes in three parts: a header, a textual description
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section, and a trace frame section with binary data.
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<p>The header has the form <code>\x7fTRACE0\n</code>. The first byte is
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<code>0x7f</code> so as to indicate that the file contains binary data,
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while the <code>0</code> is a version number that may have different values
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in the future.
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<p>The description section consists of multiple lines of <span class="sc">ascii</span> text
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separated by newline characters (<code>0xa</code>). The lines may include a
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variety of optional descriptive or context-setting information, such
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as tracepoint definitions or register set size. <span class="sc">gdb</span> will
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ignore any line that it does not recognize. An empty line marks the end
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of this section.
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<dl>
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<dt><code>R </code><var>size</var><dd>Specifies the size of a register block in bytes. This is equal to the
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size of a <code>g</code> packet payload in the remote protocol. <var>size</var>
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is an ascii decimal number. There should be only one such line in
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a single trace file.
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<br><dt><code>status </code><var>status</var><dd>Trace status. <var>status</var> has the same format as a <code>qTStatus</code>
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remote packet reply. There should be only one such line in a single trace
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file.
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<br><dt><code>tp </code><var>payload</var><dd>Tracepoint definition. The <var>payload</var> has the same format as
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<code>qTfP</code>/<code>qTsP</code> remote packet reply payload. A single tracepoint
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may take multiple lines of definition, corresponding to the multiple
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reply packets.
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<br><dt><code>tsv </code><var>payload</var><dd>Trace state variable definition. The <var>payload</var> has the same format as
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<code>qTfV</code>/<code>qTsV</code> remote packet reply payload. A single variable
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may take multiple lines of definition, corresponding to the multiple
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reply packets.
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<br><dt><code>tdesc </code><var>payload</var><dd>Target description in XML format. The <var>payload</var> is a single line of
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the XML file. All such lines should be concatenated together to get
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the original XML file. This file is in the same format as <code>qXfer</code>
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<code>features</code> payload, and corresponds to the main <code>target.xml</code>
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file. Includes are not allowed.
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</dl>
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<p>The trace frame section consists of a number of consecutive frames.
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Each frame begins with a two-byte tracepoint number, followed by a
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four-byte size giving the amount of data in the frame. The data in
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the frame consists of a number of blocks, each introduced by a
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character indicating its type (at least register, memory, and trace
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state variable). The data in this section is raw binary, not a
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hexadecimal or other encoding; its endianness matches the target's
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endianness.
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<!-- FIXME bi-arch may require endianness/arch info in description section -->
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<dl>
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<dt><code>R </code><var>bytes</var><dd>Register block. The number and ordering of bytes matches that of a
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<code>g</code> packet in the remote protocol. Note that these are the
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actual bytes, in target order, not a hexadecimal encoding.
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<br><dt><code>M </code><var>address</var> <var>length</var> <var>bytes</var><code>...</code><dd>Memory block. This is a contiguous block of memory, at the 8-byte
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address <var>address</var>, with a 2-byte length <var>length</var>, followed by
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<var>length</var> bytes.
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<br><dt><code>V </code><var>number</var> <var>value</var><dd>Trace state variable block. This records the 8-byte signed value
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<var>value</var> of trace state variable numbered <var>number</var>.
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</dl>
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<p>Future enhancements of the trace file format may include additional types
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of blocks.
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</body></html>
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