> DB>     push    CS
 > DB>     pop     DS
 > DB>     mov     SS,[_SS]    ;restore them back again
 > DB>     mov     SP,[_SP]
 > DB>     ...
 > Are you sure this is safe? You are using the stack here. Not
 > good when SS
 > and SP are messed up, eh? :)
 > There's nothing wrong with:
 >          mov       ss,cs:[_ss]
 >          mov       sp,cs:[_sp]
same thing. except CS takes one byte in each.cli is also needed when exit
from an INT (some not all of them preverves flags)
special care when switching stack also.
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