diff options
Diffstat (limited to 'src/Machine.hs')
| -rw-r--r-- | src/Machine.hs | 381 |
1 files changed, 1 insertions, 380 deletions
diff --git a/src/Machine.hs b/src/Machine.hs index a16127f..a1ea028 100644 --- a/src/Machine.hs +++ b/src/Machine.hs @@ -1,12 +1,11 @@ {-# LANGUAGE GeneralizedNewtypeDeriving #-} --- This module describes the basic types and operations for our machine. +-- This module describes the basic types for our machine. module Machine where import qualified Data.Vector.Unboxed as V import qualified Data.Vector.Unboxed.Mutable as VM import Prelude hiding (Word) import Data.Word (Word32, Word16, Word8) -import Data.Bits (testBit, setBit, clearBit, (.&.), (.|.), shift) import Data.IORef import Control.Monad import Control.Monad.IO.Class (liftIO) @@ -16,9 +15,6 @@ import Network.Socket import Utils -------------------------------------------------------------------------------- --- Base Types - type Long = Word32 type Word = Word16 type Byte = Word8 @@ -50,378 +46,3 @@ with :: (Machine -> b) -> (b -> IO a) -> Emulator a with field f = do m <- ask liftIO $ f (field m) - - -------------------------------------------------------------------------------- --- Data and Address Registers Access - -readD :: Int -> Int -> Emulator Long -readD 0 s = with drs $ \rs -> do - (r,_,_,_,_,_,_,_) <- readIORef rs - return $ convertLong r s -readD 1 s = with drs $ \rs -> do - (_,r,_,_,_,_,_,_) <- readIORef rs - return $ convertLong r s -readD 2 s = with drs $ \rs -> do - (_,_,r,_,_,_,_,_) <- readIORef rs - return $ convertLong r s -readD 3 s = with drs $ \rs -> do - (_,_,_,r,_,_,_,_) <- readIORef rs - return $ convertLong r s -readD 4 s = with drs $ \rs -> do - (_,_,_,_,r,_,_,_) <- readIORef rs - return $ convertLong r s -readD 5 s = with drs $ \rs -> do - (_,_,_,_,_,r,_,_) <- readIORef rs - return $ convertLong r s -readD 6 s = with drs $ \rs -> do - (_,_,_,_,_,_,r,_) <- readIORef rs - return $ convertLong r s -readD 7 s = with drs $ \rs -> do - (_,_,_,_,_,_,_,r) <- readIORef rs - return $ convertLong r s -readD _ _ = return $ error "Incorrect Data register read" - -readA :: Int -> Int -> Emulator Long -readA 0 s = with ars $ \rs -> do - (r,_,_,_,_,_,_) <- readIORef rs - return $ convertLong r s -readA 1 s = with ars $ \rs -> do - (_,r,_,_,_,_,_) <- readIORef rs - return $ convertLong r s -readA 2 s = with ars $ \rs -> do - (_,_,r,_,_,_,_) <- readIORef rs - return $ convertLong r s -readA 3 s = with ars $ \rs -> do - (_,_,_,r,_,_,_) <- readIORef rs - return $ convertLong r s -readA 4 s = with ars $ \rs -> do - (_,_,_,_,r,_,_) <- readIORef rs - return $ convertLong r s -readA 5 s = with ars $ \rs -> do - (_,_,_,_,_,r,_) <- readIORef rs - return $ convertLong r s -readA 6 s = with ars $ \rs -> do - (_,_,_,_,_,_,r) <- readIORef rs - return $ convertLong r s -readA 7 s = isSupervisor >>= \sup -> if sup - then with ssp $ \sp -> do - v <- readIORef sp - return $ convertLong v s - else with usp $ \sp -> do - v <- readIORef sp - return $ convertLong v s -readA _ _ = return $ error "Incorrect Address register read" - - -writeD :: Int -> Int -> Long -> Emulator () -writeD 0 s r = with drs $ \rs -> do - (r0,r1,r2,r3,r4,r5,r6,r7) <- readIORef rs - writeIORef rs (combineLong r r0 s,r1,r2,r3,r4,r5,r6,r7) -writeD 1 s r = with drs $ \rs -> do - (r0,r1,r2,r3,r4,r5,r6,r7) <- readIORef rs - writeIORef rs (r0,combineLong r r1 s,r2,r3,r4,r5,r6,r7) -writeD 2 s r = with drs $ \rs -> do - (r0,r1,r2,r3,r4,r5,r6,r7) <- readIORef rs - writeIORef rs (r0,r1,combineLong r r2 s,r3,r4,r5,r6,r7) -writeD 3 s r = with drs $ \rs -> do - (r0,r1,r2,r3,r4,r5,r6,r7) <- readIORef rs - writeIORef rs (r0,r1,r2,combineLong r r3 s,r4,r5,r6,r7) -writeD 4 s r = with drs $ \rs -> do - (r0,r1,r2,r3,r4,r5,r6,r7) <- readIORef rs - writeIORef rs (r0,r1,r2,r3,combineLong r r4 s,r5,r6,r7) -writeD 5 s r = with drs $ \rs -> do - (r0,r1,r2,r3,r4,r5,r6,r7) <- readIORef rs - writeIORef rs (r0,r0,r2,r3,r4,combineLong r r5 s,r6,r7) -writeD 6 s r = with drs $ \rs -> do - (r0,r1,r2,r3,r4,r5,r6,r7) <- readIORef rs - writeIORef rs (r0,r1,r2,r3,r4,r5,combineLong r r6 s,r7) -writeD 7 s r = with drs $ \rs -> do - (r0,r1,r2,r3,r4,r5,r6,r7) <- readIORef rs - writeIORef rs (r0,r1,r2,r3,r4,r5,r6,combineLong r r7 s) -writeD _ _ _ = return $ error "Incorrect Data register write" - -writeA :: Int -> Int -> Long -> Emulator () -writeA 0 s r = with ars $ \rs -> do - (r0,r1,r2,r3,r4,r5,r6) <- readIORef rs - writeIORef rs (combineLong r r0 s,r1,r2,r3,r4,r5,r6) -writeA 1 s r = with ars $ \rs -> do - (r0,r1,r2,r3,r4,r5,r6) <- readIORef rs - writeIORef rs (r0,combineLong r r1 s,r2,r3,r4,r5,r6) -writeA 2 s r = with ars $ \rs -> do - (r0,r1,r2,r3,r4,r5,r6) <- readIORef rs - writeIORef rs (r0,r1,combineLong r r2 s,r3,r4,r5,r6) -writeA 3 s r = with ars $ \rs -> do - (r0,r1,r2,r3,r4,r5,r6) <- readIORef rs - writeIORef rs (r0,r1,r2,combineLong r r3 s,r4,r5,r6) -writeA 4 s r = with ars $ \rs -> do - (r0,r1,r2,r3,r4,r5,r6) <- readIORef rs - writeIORef rs (r0,r1,r2,r3,combineLong r r4 s,r5,r6) -writeA 5 s r = with ars $ \rs -> do - (r0,r1,r2,r3,r4,r5,r6) <- readIORef rs - writeIORef rs (r0,r0,r2,r3,r4,combineLong r r5 s,r6) -writeA 6 s r = with ars $ \rs -> do - (r0,r1,r2,r3,r4,r5,r6) <- readIORef rs - writeIORef rs (r0,r1,r2,r3,r4,r5,combineLong r r6 s) -writeA 7 s r = isSupervisor >>= \sup -> if sup - then with ssp $ \sp -> do - v <- readIORef sp - writeIORef sp $ combineLong r v s - else with usp $ \sp -> do - v <- readIORef sp - writeIORef sp $ combineLong r v s -writeA _ _ _ = return $ error "Incorrect Address register write" - - -------------------------------------------------------------------------------- --- PC Register Access - -readPC = with pc $ \pc -> do - pc <- readIORef pc - return pc - -writePC r = with pc $ \pc -> do - writeIORef pc r - -incPC = with pc $ \pc -> do - pcval <- readIORef pc - writeIORef pc (pcval + 2) - - -------------------------------------------------------------------------------- --- Status Register Access - -writeSR :: Word -> Emulator () -writeSR v = with sr $ \sr -> do - writeIORef sr v - -readSR :: Emulator Word -readSR = with sr $ \sr -> do - sr <- readIORef sr - return sr - - -isTracing :: Emulator Bool -isTracing = with sr $ \sr -> do - sr <- readIORef sr - return $ testBit sr 15 - -isSupervisor :: Emulator Bool -isSupervisor = with sr $ \sr -> do - sr <- readIORef sr - return $ testBit sr 13 - -interruptLevel :: Emulator Int -interruptLevel = with sr $ \sr -> do - sr <- readIORef sr - return $ extractBits sr [5, 6, 7] - -isExtend :: Emulator Bool -isExtend = with sr $ \sr -> do - sr <- readIORef sr - return $ testBit sr 4 - -isNegative :: Emulator Bool -isNegative = with sr $ \sr -> do - sr <- readIORef sr - return $ testBit sr 3 - -isZero :: Emulator Bool -isZero = with sr $ \sr -> do - sr <- readIORef sr - return $ testBit sr 2 - -isOverflow :: Emulator Bool -isOverflow = with sr $ \sr -> do - sr <- readIORef sr - return $ testBit sr 1 - -isCarry :: Emulator Bool -isCarry = with sr $ \sr -> do - sr <- readIORef sr - return $ testBit sr 0 - - -setTracing :: Bool -> Emulator () -setTracing b = with sr $ \sr -> do - srval <- readIORef sr - writeIORef sr $ (if b then setBit else clearBit) srval 15 - -setSupervisor :: Bool -> Emulator () -setSupervisor b = with sr $ \sr -> do - srval <- readIORef sr - writeIORef sr $ (if b then setBit else clearBit) srval 13 - -setInterruptLevel :: Int -> Emulator () -setInterruptLevel v = do - srv <- readSR - writeSR $ srv .&. fromIntegral 0xF8FF .|. fromIntegral (shift v 16) - -setExtend :: Bool -> Emulator () -setExtend b = with sr $ \sr -> do - srval <- readIORef sr - writeIORef sr $ (if b then setBit else clearBit) srval 4 - -setNegative :: Bool -> Emulator () -setNegative b = with sr $ \sr -> do - srval <- readIORef sr - writeIORef sr $ (if b then setBit else clearBit) srval 3 - -setZero :: Bool -> Emulator () -setZero b = with sr $ \sr -> do - srval <- readIORef sr - writeIORef sr $ (if b then setBit else clearBit) srval 2 - -setOverflow :: Bool -> Emulator () -setOverflow b = with sr $ \sr -> do - srval <- readIORef sr - writeIORef sr $ (if b then setBit else clearBit) srval 1 - -setCarry :: Bool -> Emulator () -setCarry b = with sr $ \sr -> do - srval <- readIORef sr - writeIORef sr $ (if b then setBit else clearBit) srval 0 - - -------------------------------------------------------------------------------- --- Memmory Access - -getByte :: Long -> Emulator Byte -getByte a | a < 0x8 = with rom $ \rom -> return $ rom V.! fromIntegral a - | a < 0x7e0000 = with ram $ \ram -> - if VM.length ram >= fromIntegral a - then VM.unsafeRead ram (fromIntegral a) - else return 0xff - | a < 0x800000 = with rom $ \rom -> - return $ rom V.! (fromIntegral a - 0x7e0000) - | otherwise = return 0xff - - -- TODO: only even addresses are allowed -getWord :: Long -> Emulator Word -getWord a = do - g <- getByte a - l <- getByte (a + 1) - return $ (fromIntegral g) * 256 + (fromIntegral l) - - -- TODO: only even addresses are allowed -getLong :: Long -> Emulator Long -getLong a = do - g <- getWord a - l <- getWord (a + 2) - return $ (fromIntegral g) * 256 * 256 + (fromIntegral l) - - -setByte :: Long -> Byte -> Emulator () -setByte a b | a < 0x8 = return () - | a < 0x7e0000 = with ram $ \ram -> - VM.write ram (fromIntegral a) b - | otherwise = return () - - -- TODO: only even addresses are allowed -setWord :: Long -> Word -> Emulator () -setWord a w = do - setByte a (fromIntegral (div (fromIntegral w) 256)) - setByte (a + 1) (fromIntegral (rem (fromIntegral w) 256)) - - -- TODO: only even addresses are allowed -setLong :: Long -> Long -> Emulator () -setLong a l = do - setWord a (fromIntegral (div (fromIntegral l) (256 * 256))) - setWord (a + 2) (fromIntegral (rem (fromIntegral l) (256 * 256))) - - -getMemory :: Long -> Int -> Emulator Long -getMemory a 1 = do - val <- getByte a - return $ fromIntegral val -getMemory a 2 = do - val <- getWord a - return $ fromIntegral val -getMemory a 4 = do - val <- getLong a - return $ fromIntegral val -getMemory _ _ = error "Bad size of getMemory" - -setMemory :: Long -> Int -> Long -> Emulator () -setMemory a 1 v = setByte a $ fromIntegral v -setMemory a 2 v = setWord a $ fromIntegral v -setMemory a 4 v = setLong a $ fromIntegral v -setMemory _ _ _ = error "Bad size of setMemory" - - -------------------------------------------------------------------------------- --- Operand Access - -skipOp :: Int -> Emulator () -skipOp 1 = incPC -skipOp 2 = incPC -skipOp 4 = do - incPC - incPC -skipOp _ = error "Bad skipOp" - -getOp :: Int -> Int -> Int - -> Emulator (Emulator Long, Long -> Emulator ()) -getOp 0 dr s = return (readD dr s, writeD dr s) -getOp 1 ar s = return (readA ar s, writeA ar s) -getOp 2 ar s = do - addr <- readA ar 4 - return (getMemory addr s, setMemory addr s) -getOp 3 ar s = do - addr <- readA ar 4 - writeA ar 4 (addr + (fromIntegral s)) - return (getMemory addr s, setMemory addr s) -getOp 4 ar s = do - addr <- readA ar 4 - let naddr = addr - (fromIntegral s) - writeA ar 4 addr - return (getMemory naddr s, setMemory naddr s) -getOp 5 ar s = do - pc <- readPC - skipOp 2 - disp <- getMemory pc 2 - addr <- readA ar 4 - let naddr = addr + disp - return (getMemory naddr s, setMemory naddr s) -getOp 6 ar s = do - pc <- readPC - skipOp 2 - prefix <- getMemory pc 1 - index <- (if testBit prefix 0 then readA else readD) - (extractBits prefix [1..3]) - ((extractBits prefix [4] + 1) * 2) - disp <- getMemory (pc + 1) 1 - addr <- readA ar 4 - let naddr = addr + index + disp - return (getMemory naddr s, setMemory naddr s) -getOp 7 2 s = do - addr <- readPC - skipOp 2 - disp <- getMemory addr 2 - let naddr = addr + disp - return (getMemory naddr s, setMemory naddr s) -getOp 7 3 s = do - addr <- readPC - skipOp 2 - prefix <- getMemory addr 1 - index <- (if testBit prefix 0 then readA else readD) - (extractBits prefix [1..3]) - ((extractBits prefix [4] + 1) * 2) - disp <- getMemory (addr + 1) 1 - let naddr = addr + index + disp - return (getMemory naddr s, setMemory naddr s) -getOp 7 0 s = do - pc <- readPC - skipOp 2 - addr <- getMemory pc 2 - return (getMemory addr s, setMemory addr s) -getOp 7 1 s = do - pc <- readPC - skipOp 4 - addr <- getLong pc - return (getMemory addr s, setMemory addr s) -getOp 7 4 s = do - addr <- readPC - skipOp s - let naddr = addr + if s == 1 then 1 else 0 - return (getMemory naddr s, setMemory naddr s) |