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J-Link, ST-Link capabilities
SWD mode on a debug probe has several capabilities.  J-Link and ST-Link use the SWO pin as a UART type interface where the application on the Cortex sends printf data to a PC console. 

There are notes that the probes also have SWV event and data tracing, and software instrumented tracing.  I would like to understand, what is event and data tracing?  What is interrupt and exception event logging?  Is this data available from the macrocell, is it code the user inserts in an program?

A last follow up last question, are there any thoughts on adding J-Trace support for instruction and data tracing?

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