yeah, it looks like that getting registers is still possible, but it will require to write more code. Basically, one need to reimplement some subset of the TCI.
I'm currently trying to decide what trace tool we will use in BAP, and how. Our legacy patch to qemu looks unmaintainable, so I'm looking at your tracer. Ideally, we can factor it out, so that it can be used by both project. What do you think of it?