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Unlike x86, ARM doesn't support a generic thread pointer for TLS data, so things like ``` reg read tp ... memory read tp ``` Don't work, and you need to specify tpidr. This works, especially because that's the name GDB uses. But for ease of use, and at the request of @aperez I've made it so we can reference it via `tp`. I personally don't have an aarch machine, and all the arm examples in `Shell/Register/Core` are freebsd and don't contain tpidr, so I was unable to add a shell test for this. I added a test to the AARCH register tests, but without an Aarch machine I'm hoping these work.