The checkFaultAccessAArch64SysReg function is now in charge of returning the Undefined Instruction fault for unimplemented registers Change-Id: I75c00c6fbce33d1729a4923eae585260a8461db3 Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com> Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/61971 Maintainer: Jason Lowe-Power <power.jg@gmail.com> Reviewed-by: Richard Cooper <richard.cooper@arm.com> Reviewed-by: Jason Lowe-Power <power.jg@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>