I think one of the motivations for having separate modes like this, with (some) separate registers for each, is to reduce the time taken to switch contexts between modes. If they didn’t have separate registers, the data in the user mode registers would have to be saved somewhere when making a switch into kernel mode, and then copied back again when switching back to user mode.
How about two pieces of paper (based on a t shirt I saw once)… paper on your front, with
< BODY >
, and second piece of paper with< /BODY >
on your back. Made me laugh when I saw it :)Edit: the tags keep being deleted… perhaps it is readable now…