80 lines
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80 lines
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<title>Varying Target Capabilities - Debugging with GDB</title>
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<a name="Varying-Target-Capabilities"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Rationale.html#Rationale">Rationale</a>,
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Previous: <a rel="previous" accesskey="p" href="Using-Agent-Expressions.html#Using-Agent-Expressions">Using Agent Expressions</a>,
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Up: <a rel="up" accesskey="u" href="Agent-Expressions.html#Agent-Expressions">Agent Expressions</a>
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<h3 class="section">F.4 Varying Target Capabilities</h3>
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<p>Some targets don't support floating-point, and some would rather not
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have to deal with <code>long long</code> operations. Also, different targets
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will have different stack sizes, and different bytecode buffer lengths.
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<p>Thus, GDB needs a way to ask the target about itself. We haven't worked
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out the details yet, but in general, GDB should be able to send the
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target a packet asking it to describe itself. The reply should be a
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packet whose length is explicit, so we can add new information to the
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packet in future revisions of the agent, without confusing old versions
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of GDB, and it should contain a version number. It should contain at
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least the following information:
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<ul>
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<li>whether floating point is supported
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<li>whether <code>long long</code> is supported
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<li>maximum acceptable size of bytecode stack
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<li>maximum acceptable length of bytecode expressions
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<li>which registers are actually available for collection
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<li>whether the target supports disabled tracepoints
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</ul>
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</body></html>
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