Also, in ARM more specifically, you can see miscregs at
https://github.com/gem5/gem5/blob/cc3e12b504c20b3bc78db52059d3f4f9b02dfbe8/src/arch/arm/miscregs.hh#L56
Most are what the ARM manuals call "System Registers", but a few
others are just convenient ways to implement other ISA features like
e.g.
A long time ago when gem5 just supported Alpha, there were three types of
registers, integers, floats, and everything else. The "everything else"
were essentially control registers, or in other words registers which had
side effects from accessing them. They were called "Misc" for miscellaneous
sin
