Merge remote-tracking branch 'origin/feature/asl' into feature/asl

macaw-aarch32/macaw-aarch32.cabal

@@ -30,6 +30,7 @@ library
                      , ansi-wl-pprint
                      , asl-translator
                      , bytestring
+                     , bv-sized
                      , cereal
                      , containers
                      , crucible

macaw-aarch32/src/Data/Macaw/ARM/Disassemble.hs

@@ -76,7 +76,6 @@ import qualified Data.ByteString as BS
 import qualified Data.ByteString.Lazy as LBS
 import           Data.Macaw.ARM.ARMReg
 import           Data.Macaw.ARM.Arch()
-import           Data.Macaw.AbsDomain.AbsState as MA
 import           Data.Macaw.CFG
 import           Data.Macaw.CFG.Block
 import qualified Data.Macaw.CFG.Core as MC
@@ -93,7 +92,6 @@ import qualified Dismantle.ARM.T32 as ThumbD
 import           Text.Printf ( printf )
 
 import qualified SemMC.Architecture.AArch32 as ARM
-import Debug.Trace
 
 data InstructionSet = A32I ARMD.Instruction | T32I ThumbD.Instruction
                       deriving (Eq, Show)
@@ -185,8 +183,8 @@ disassembleBlock lookupSemantics gs curPCAddr blockOff maxOffset = do
     Right (i, bytesRead) -> do
       -- FIXME: Set PSTATE.T based on whether instruction is A32I or T32I
       -- traceM ("II: " ++ show i)
-      let curPC = MM.segmentOffAddr seg off
+      -- let curPC = MM.segmentOffAddr seg off
-          nextPCOffset = off + bytesRead
+      let nextPCOffset = off + bytesRead
           nextPC = MM.segmentOffAddr seg nextPCOffset
           nextPCVal :: Value ARM.AArch32 ids (BVType 32) = MC.RelocatableValue (MM.addrWidthRepr curPCAddr) nextPC
           -- curPCVal :: Value ARM.AArch32 ids (BVType 32) = MC.RelocatableValue (MM.addrWidthRepr curPCAddr) curPC
@@ -241,18 +239,17 @@ readInstruction :: (MM.MemWidth w)
                 -> Either (ARMMemoryError w) (InstructionSet, MM.MemWord w)
 readInstruction addr = do
   let seg = MM.segoffSegment addr
-      segRelAddrRaw = MM.segoffAddr addr
+  let segRelAddr = MM.segoffAddr addr
-      -- Addresses specified in ARM instructions have the low bit
+  -- Addresses specified in ARM instructions have the low bit
-      -- clear, but Thumb (T32) target addresses have the low bit sit.
+  -- clear, but Thumb (T32) target addresses have the low bit sit.
-      -- This is only manifested in the instruction addresses: the
+  -- This is only manifested in the instruction addresses: the
-      -- actual PC for fetching instructions clears the low bit to
+  -- actual PC for fetching instructions clears the low bit to
-      -- generate aligned memory accesses.
+  -- generate aligned memory accesses.
-      loBit = MM.addrOffset segRelAddrRaw .&. 1
+  let alignedMsegOff = MM.clearSegmentOffLeastBit addr
-      segRelAddr = segRelAddrRaw { addrOffset = MM.addrOffset segRelAddrRaw `xor` loBit }
   if MM.segmentFlags seg `MMP.hasPerm` MMP.execute
   then do
-      let ao = addrOffset segRelAddr
+      -- traceM ("Orig addr = " ++ show addr ++ " modified to " ++ show ao)
-      alignedMsegOff <- liftMaybe (ARMInvalidInstructionAddress seg ao) (MM.resolveSegmentOff seg ao)
+      -- alignedMsegOff <- liftMaybe (ARMInvalidInstructionAddress seg ao) (MM.resolveSegmentOff seg ao)
       contents <- liftMemError $ MM.segoffContentsAfter alignedMsegOff
       case contents of
         [] -> ET.throwError $ ARMMemoryError (MM.AccessViolation segRelAddr)
@@ -276,12 +273,6 @@ readInstruction addr = do
               Nothing -> ET.throwError $ ARMInvalidInstruction segRelAddr contents
   else ET.throwError $ ARMMemoryError (MM.PermissionsError segRelAddr)
 
-liftMaybe :: ARMMemoryError w -> Maybe a -> Either (ARMMemoryError w) a
-liftMaybe err ma =
-  case ma of
-    Just a -> Right a
-    Nothing -> Left err
-
 liftMemError :: Either (MM.MemoryError w) a -> Either (ARMMemoryError w) a
 liftMemError e =
   case e of

macaw-aarch32/src/Data/Macaw/ARM/Identify.hs

@@ -10,7 +10,7 @@ module Data.Macaw.ARM.Identify
     ) where
 
 import           Control.Lens ( (^.) )
-import           Data.Macaw.ARM.Arch
+import qualified Data.Macaw.ARM.ARMReg as AR
 import           Data.Macaw.AbsDomain.AbsState ( AbsProcessorState
                                                , AbsValue(..)
                                                , transferValue
@@ -18,6 +18,7 @@ import           Data.Macaw.AbsDomain.AbsState ( AbsProcessorState
                                                )
 import qualified Data.Macaw.CFG as MC
 import qualified Data.Macaw.Memory as MM
+import qualified Data.Macaw.SemMC.Simplify as MSS
 import qualified Data.Macaw.Types as MT
 import           Data.Semigroup
 import qualified Data.Sequence as Seq
@@ -42,8 +43,14 @@ identifyCall :: MM.Memory (MC.ArchAddrWidth ARM.AArch32)
              -> Seq.Seq (MC.Stmt ARM.AArch32 ids)
              -> MC.RegState (MC.ArchReg ARM.AArch32) (MC.Value ARM.AArch32 ids)
              -> Maybe (Seq.Seq (MC.Stmt ARM.AArch32 ids), MC.ArchSegmentOff ARM.AArch32)
-identifyCall _mem _stmts0 _rs = Nothing  -- KWQ: for now, nothing is identified as a call
+identifyCall mem stmts0 rs
-
+  | not (null stmts0)
+  , MC.RelocatableValue {} <- rs ^. MC.boundValue AR.arm_LR
+  , Just retVal <- MSS.simplifyValue (rs ^. MC.boundValue AR.arm_LR)
+  , Just retAddrVal <- MC.valueAsMemAddr retVal
+  , Just retAddr <- MM.asSegmentOff mem retAddrVal =
+      Just (stmts0, retAddr)
+  | otherwise = Nothing
 
 -- | Intended to identify a return statement.
 --

macaw-aarch32/src/Data/Macaw/ARM/Semantics/TH.hs

@@ -25,14 +25,15 @@ import qualified Control.Monad.Except as E
 import qualified Control.Monad.State.Strict as St
 import qualified Data.Map as Map
 import qualified Data.Functor.Const as C
+import qualified Data.Bits as B
+import qualified Data.BitVector.Sized as BVS
 import           Data.List (isPrefixOf)
 import           Data.Macaw.SemMC.TH.Monad
 import           Data.Macaw.ARM.ARMReg
 import           Data.Macaw.ARM.Arch
 import qualified Data.Macaw.CFG as M
 import qualified Data.Macaw.SemMC.Generator as G
-import qualified Data.Macaw.SemMC.Operands as O
+import           Data.Macaw.SemMC.TH ( addEltTH, appToExprTH, evalNonceAppTH, evalBoundVar, natReprTH, symFnName )
-import           Data.Macaw.SemMC.TH ( addEltTH, appToExprTH, evalNonceAppTH, evalBoundVar, natReprTH, symFnName, asName )
 import           Data.Macaw.SemMC.TH.Monad
 import qualified Data.Macaw.Types as M
 import qualified Data.Parameterized.Context as Ctx
@@ -44,13 +45,11 @@ import           Data.Parameterized.Some ( Some(..) )
 import qualified Data.Parameterized.TraversableFC as FC
 import           Data.Proxy ( Proxy(..) )
 import           GHC.TypeLits as TL
+import           Data.Parameterized.NatRepr
 import           Language.Haskell.TH
 import           Language.Haskell.TH.Syntax
 import qualified SemMC.Architecture.AArch32 as ARM
 import qualified SemMC.Architecture.ARM.Opcodes as ARM
-import qualified SemMC.Architecture as A
-import qualified SemMC.Architecture.ARM.Location as Loc
-import qualified SemMC.Architecture.Location as L
 import qualified What4.BaseTypes as WT
 import qualified What4.Expr.Builder as WB
 
@@ -58,7 +57,6 @@ import qualified Data.Kind as Kind
 import           Numeric.Natural
 
 import qualified Language.ASL.Globals as ASL
-import qualified Language.ASL.Globals.Definitions as ASL
 
 loadSemantics :: IO (ARM.ASLSemantics)
 loadSemantics = ARM.loadSemantics (ARM.ASLSemanticsOpts { ARM.aslOptTrimRegs = True})
@@ -155,12 +153,12 @@ armNonceAppEval bvi nonceApp =
             case args of
               Ctx.Empty Ctx.:> assert Ctx.:> bv -> Just $ do
                 assertTH <- addEltTH M.LittleEndian bvi assert
-                bv <- addEltTH M.LittleEndian bvi bv
+                bvElt <- addEltTH M.LittleEndian bvi bv
                 liftQ [| case $(return assertTH) of
-                          M.BoolValue True -> return $(return bv)
+                          M.BoolValue True -> return $(return bvElt)
                           M.BoolValue False -> E.throwError (G.GeneratorMessage $ "Bitvector length assertion failed!")
                           -- FIXME: THIS SHOULD THROW AN ERROR
-                          _ -> return $(return bv)
+                          _ -> return $(return bvElt)
                           -- nm -> E.throwError (G.GeneratorMessage $ "Bitvector length assertion failed: <FIXME: PRINT NAME>")
                        |]
               _ -> fail "Invalid call to assertBV"
@@ -314,6 +312,25 @@ concreteIte v t f = case v of
   M.CValue (M.BoolCValue b) -> if b then t else f
   _ ->  E.throwError (G.GeneratorMessage $ "concreteIte: requires concrete value" <> show (M.ppValueAssignments v))
 
+-- | A smart constructor for division
+--
+-- The smart constructor recognizes divisions that can be converted into shifts.
+-- We convert the operation to a shift if the divisior is a power of two.
+sdiv :: (1 <= n)
+     => NatRepr n
+     -> M.Value ARM.AArch32 ids (M.BVType n)
+     -> M.Value ARM.AArch32 ids (M.BVType n)
+     -> G.Generator ARM.AArch32 ids s (G.Expr ARM.AArch32 ids (M.BVType n))
+sdiv repr dividend divisor =
+  case divisor of
+    M.BVValue nr val
+      | bv <- BVS.bitVector' repr val
+      , BVS.bvPopCount bv == 1 ->
+        withKnownNat repr $
+          let app = M.BVSar nr dividend (M.BVValue nr (fromIntegral (B.countTrailingZeros bv)))
+          in (G.ValueExpr . M.AssignedValue) <$> G.addAssignment (M.EvalApp app)
+    _ -> addArchAssignment (SDiv repr dividend divisor)
+
 armAppEvaluator :: M.Endianness
                 -> BoundVarInterpretations ARM.AArch32 t fs
                 -> WB.App (WB.Expr t) ctp
@@ -328,8 +345,7 @@ armAppEvaluator endianness interps elt =
       WB.BVSdiv w bv1 bv2 -> return $ do
         e1 <- addEltTH endianness interps bv1
         e2 <- addEltTH endianness interps bv2
-        liftQ [| addArchAssignment (SDiv $(natReprTH w) $(return e1) $(return e2))
+        liftQ [| sdiv $(natReprTH w) $(return e1) $(return e2) |]
-               |]
       WB.BVUrem w bv1 bv2 -> return $ do
         e1 <- addEltTH endianness interps bv1
         e2 <- addEltTH endianness interps bv2

macaw-aarch32/tests/arm/test-direct-call-a32.mcw.expected

@@ -0,0 +1,10 @@
+R { funcs = [ (0x100d8, [(0x100d8, 48)])
+            , (0x1010c, [ (0x1010c, 32)
+                        , (0x1012c, 12)
+                        ])
+            , (0x10138, [ (0x10138, 28)
+                        , (0x10154, 4)
+                        ])
+            ]
+  , ignoreBlocks = [0x10158]
+  }

macaw-aarch32/tests/arm/test-just-exit-t32.mcw.expected

@@ -1,4 +0,0 @@
-R { funcs = [ (0x8001, [(0x8001, 6), (0x8007,10)])
-            ]
-  , ignoreBlocks = []
-  }

macaw-semmc/src/Data/Macaw/SemMC/Simplify.hs

@@ -52,6 +52,7 @@ simplifyApp a =
     BVOr  sz l r                      -> binopbv (.|.) sz l r
     BVShl sz l r                      -> binopbv (\l' r' -> shiftL l' (fromIntegral r')) sz l r
     BVShr sz l r                      -> binopbv (\l' r' -> shiftR l' (fromIntegral r')) sz l r
+    BVSar sz l r                      -> binopbv (\l' r' -> shiftR (toSigned sz l') (fromIntegral (toSigned sz r'))) sz l r
     BVAdd _ l (BVValue _ 0)           -> Just l
     BVAdd _ (BVValue _ 0) r           -> Just r
     BVAdd rep l@(BVValue {}) r@(RelocatableValue {}) ->
@@ -66,10 +67,17 @@ simplifyApp a =
     BVMul rep l r                     -> binopbv (*) rep l r
     SExt (BVValue u n) sz             -> Just (BVValue sz (toUnsigned sz (toSigned u n)))
     UExt (BVValue _ n) sz             -> Just (mkLit sz n)
+    UExt (RelocatableValue _arep addr) sz -> do
+      memword <- MM.asAbsoluteAddr addr
+      return $ mkLit sz (fromIntegral memword)
     Trunc (BVValue _ x) sz            -> Just (mkLit sz x)
 
     Eq l r                            -> boolop (==) l r
     BVComplement sz x                 -> unop complement sz x
+    BVSignedLe v1 v2                  -> signedRelOp (<=) v1 v2
+    BVSignedLt v1 v2                  -> signedRelOp (<) v1 v2
+    BVUnsignedLe v1 v2                -> unsignedRelOp (<=) v1 v2
+    BVUnsignedLt v1 v2                -> unsignedRelOp (<) v1 v2
     _                                 -> Nothing
   where
     unop :: forall n . (tp ~ BVType n)
@@ -97,3 +105,19 @@ simplifyApp a =
     binopbv f sz (BVValue _ l) (BVValue _ r) =
       Just (mkLit sz (f l r))
     binopbv _ _ _ _ = Nothing
+    signedRelOp :: forall n
+                 . (Integer -> Integer -> Bool)
+                -> Value arch ids (BVType n)
+                -> Value arch ids (BVType n)
+                -> Maybe (Value arch ids BoolType)
+    signedRelOp op (BVValue r1 v1) (BVValue _ v2) =
+      Just (BoolValue (op (toSigned r1 v1) (toSigned r1 v2)))
+    signedRelOp _ _ _ = Nothing
+    unsignedRelOp :: forall n
+                   . (Integer -> Integer -> Bool)
+                  -> Value arch ids (BVType n)
+                  -> Value arch ids (BVType n)
+                  -> Maybe (Value arch ids BoolType)
+    unsignedRelOp op (BVValue r1 v1) (BVValue _ v2) =
+      Just (BoolValue (op (toUnsigned r1 v1) (toUnsigned r1 v2)))
+    unsignedRelOp _ _ _ = Nothing