An apparatus 2 comprises trace circuitry 6, 120 to output exception trace data indicating exception handling events detected during monitoring of processing activity of processing circuitry 4. A configuration element 16 maintains exception trace configuration data for controlling the output of the exception trace data via the trace circuitry 6, 120. When output of exception trace data is enabled, the trace circuitry 6, 120 selects, in dependence on the exception trace configuration data, how much of the exception trace data to output.
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