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module Commands where
import Control.Lens
import Machine
doNothing :: Machine -> Machine
doNothing m = Machine (Registers (pc r + 2) (sr r) (drs r)
(ars r) (usp r) (ssp r))
(ram m) (rom m)
where r = regs m
doUnlink :: Int -> Machine -> Machine
doUnlink 7 m = let r = regs m in if isSupervisor m
then Machine (Registers (pc r + 2) (sr r) (drs r) (ars r)
(usp r) (getLong m (fromIntegral $ ssp r) + 4))
(ram m) (rom m)
else Machine (Registers (pc r + 2) (sr r) (drs r) (ars r)
(getLong m (fromIntegral $ usp r) + 4) (ssp r))
(ram m) (rom m)
doUnlink a m = let
r = regs m
av = getLong m (fromIntegral (ars r !! a))
newars = ars r & element (fromIntegral a) .~ av
in if isSupervisor m
then Machine (Registers (pc r + 2) (sr r) (drs r)
newars (usp r) (av + 4))
(ram m) (rom m)
else Machine (Registers (pc r + 2) (sr r) (drs r)
newars (av + 4) (ssp r))
(ram m) (rom m)
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