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Otherwise known as FEAT_FPMR. This register controls the behaviour of floating point operations. https://developer.arm.com/documentation/ddi0601/2024-06/AArch64-Registers/FPMR--Floating-point-Mode-Register As the current floating point register contexts are fixed size, this has been placed in a new set. Linux kernel patches have landed already, so you can cross check with those. To simplify testing we're not going to do any floating point operations, just read and write from the program and debugger to make sure each sees the other's values correctly.