Hello,

# [GNU-732] GDB support for ARMv9 Scalable Matrix Extension (SME)

* Continued working on gdbserver and remote protocol support for programs that change the SVE vector length during execution:

- Studied the 2020 discussion around Luis' proposal to support changed VL size in the Remote Serial Protocol / gdbserver, as well as relevant parts of the RSP itself.

- Started studying GDB's type system and how it handles dynamic types, and also the target description code to assess the feasibility of making the vector registers use a dynamically sized type.

- Luis made a second proposal in that mailing list discussion where the target description wouldn't be transferred via the remote protocol, just the vector length. Then both GDB and gdbserver could locally update their own descriptions based on that. Starting to think about this alternative. It would probably be simpler than changing the target description to use a dynamically sized type for the Z registers.

# Basic setup / onboarding

* Work laptop arrived. Set it up.