-{-# LANGUAGE CPP #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ForeignFunctionInterface #-}
-#include "debug.h"
module Mate.X86TrapHandling (
mateHandler,
register_signal
) where
+import Numeric
import qualified Data.Map as M
import qualified Data.ByteString.Lazy as B
import Foreign
import Foreign.C.Types
+import Harpy
+
import Mate.Types
+import Mate.NativeSizes
import {-# SOURCE #-} Mate.MethodPool
import Mate.ClassPool
+import Mate.X86CodeGen
+
+import Mate.Debug
+import Harpy.X86Disassembler
foreign import ccall "register_signal"
register_signal :: IO ()
-data TrapType =
- StaticMethodCall
- | StaticFieldAccess
- | VirtualMethodCall Bool
- | InterfaceMethodCall Bool
- | InstanceOfMiss B.ByteString
- | NoKnownTrap String
-
-getTrapType :: TrapMap -> CPtrdiff -> CPtrdiff -> TrapType
-getTrapType tmap signal_from from2 =
- case M.lookup (fromIntegral signal_from) tmap of
- (Just (StaticMethod _)) -> StaticMethodCall
- (Just (StaticField _)) -> StaticFieldAccess
- (Just (InstanceOf cn)) -> InstanceOfMiss cn
- (Just _) -> NoKnownTrap "getTrapMap: doesn't happen"
- -- maybe we've a hit on the second `from' value
- Nothing -> case M.lookup (fromIntegral from2) tmap of
- (Just (VirtualMethod imm8 _)) -> VirtualMethodCall imm8
- (Just (InterfaceMethod imm8 _)) -> InterfaceMethodCall imm8
- (Just _) -> NoKnownTrap "getTrapType: abort #1 :-("
- Nothing -> NoKnownTrap $ "getTrapType: abort #2 :-(" ++ show signal_from ++ ", " ++ show from2 ++ ", " ++ show tmap
-
-foreign export ccall mateHandler :: CPtrdiff -> CPtrdiff -> CPtrdiff -> CPtrdiff -> CPtrdiff -> IO CPtrdiff
-mateHandler :: CPtrdiff -> CPtrdiff -> CPtrdiff -> CPtrdiff -> CPtrdiff -> IO CPtrdiff
-mateHandler eip eax ebx esp esi = do
- callerAddr <- callerAddrFromStack esp
+foreign export ccall mateHandler :: CPtrdiff -> CPtrdiff -> CPtrdiff -> CPtrdiff -> IO CPtrdiff
+mateHandler :: CPtrdiff -> CPtrdiff -> CPtrdiff -> CPtrdiff -> IO CPtrdiff
+mateHandler reip reax rebx resi = do
tmap <- getTrapMap
- case getTrapType tmap eip callerAddr of
- StaticMethodCall -> staticCallHandler eip
- StaticFieldAccess -> staticFieldHandler eip
- (InstanceOfMiss cn) -> instanceOfMissHandler eip cn
- VirtualMethodCall imm8 -> invokeHandler eax eax esp imm8
- InterfaceMethodCall imm8 -> invokeHandler eax ebx esp imm8
- NoKnownTrap err ->
- case esi of
- 0x13371234 -> return (-1)
- _ -> error err
-
-staticCallHandler :: CPtrdiff -> IO CPtrdiff
-staticCallHandler eip = do
- -- the actual insn to patch as pointer
- let insn_ptr = intPtrToPtr (fromIntegral eip) :: Ptr CUChar
- -- call offset is displaced by one byte (as the first byte is the opcode)
- let imm_ptr = intPtrToPtr (fromIntegral (eip + 1)) :: Ptr CPtrdiff
- -- in codegen we set the immediate to some magic value
- -- in order to produce a SIGILL signal. we also do a safety
- -- check here, if we're really the "owner" of this signal.
- checkMe <- peek imm_ptr
- if checkMe == 0x909090ff then
- do
- entryAddr <- getMethodEntry eip 0
- poke insn_ptr 0xe8 -- `call' opcode
- -- it's a relative call, so we have to calculate the offset. why "+ 5"?
- -- (1) the whole insn is 5 bytes long
- -- (2) offset is calculated wrt to the beginning of the next insn
- poke imm_ptr (entryAddr - (eip + 5))
- return eip
- else error "staticCallHandler: something is wrong here. abort\n"
+ let reipw32 = fromIntegral reip
+ (deleteMe, ret_nreip) <- case M.lookup reipw32 tmap of
+ (Just (StaticMethod _)) ->
+ patchWithHarpy patchStaticCall reip >>= delTrue
+ (Just (StaticField _)) ->
+ staticFieldHandler reip >>= delTrue
+ (Just (InstanceOf cn)) ->
+ patchWithHarpy (`patchInstanceOf` cn) reip >>= delFalse
+ (Just (NewObject cn)) ->
+ patchWithHarpy (`patchNewObject` cn) reip >>= delTrue
+ (Just (VirtualCall False _ io_offset)) ->
+ patchWithHarpy (patchInvoke reax reax io_offset) reip
+ >>= delTrue
+ (Just (VirtualCall True _ io_offset)) ->
+ patchWithHarpy (patchInvoke rebx reax io_offset) reip
+ >>= delTrue
+ Nothing -> case resi of
+ 0x13371234 -> return (-1) >>= delFalse
+ _ -> error $ "getTrapType: abort :-( " ++ (showHex reip ". ")
+ ++ (concatMap (`showHex` ", ") (M.keys tmap))
+ if deleteMe
+ then setTrapMap $ M.delete reipw32 tmap
+ else return ()
+ return ret_nreip
+ where
+ delTrue = (\nreip -> return (False, nreip))
+ delFalse = (\nreip -> return (False, nreip))
+
+
+patchWithHarpy :: (CPtrdiff -> CodeGen () () CPtrdiff) -> CPtrdiff -> IO CPtrdiff
+patchWithHarpy patcher reip = do
+ -- this is just an upperbound. if the value is to low, patching fails. find
+ -- something better?
+ let fixme = 1024
+ let entry = Just (intPtrToPtr (fromIntegral reip), fixme)
+ let cgconfig = defaultCodeGenConfig { customCodeBuffer = entry }
+ (_, Right right) <- runCodeGenWithConfig (withDisasm $ patcher reip) () () cgconfig
+ if mateDEBUG
+ then mapM_ (printfJit . printf "patched: %s\n" . showAtt) $ snd right
+ else return ()
+ return reip
+
+withDisasm :: CodeGen e s CPtrdiff -> CodeGen e s (CPtrdiff, [Instruction])
+withDisasm patcher = do
+ reip <- patcher
+ d <- disassemble
+ return (reip, d)
+
+patchStaticCall :: CPtrdiff -> CodeGen e s CPtrdiff
+patchStaticCall reip = do
+ entryAddr <- liftIO $ getMethodEntry reip 0
+ call (fromIntegral (entryAddr - (reip + 5)) :: NativeWord)
+ return reip
+
staticFieldHandler :: CPtrdiff -> IO CPtrdiff
-staticFieldHandler eip = do
+staticFieldHandler reip = do
-- patch the offset here, first two bytes are part of the insn (opcode + reg)
- let imm_ptr = intPtrToPtr (fromIntegral (eip + 2)) :: Ptr CPtrdiff
+ let imm_ptr = intPtrToPtr (fromIntegral (reip + 2)) :: Ptr CPtrdiff
checkMe <- peek imm_ptr
if checkMe == 0x00000000 then
do
- getStaticFieldAddr eip >>= poke imm_ptr
- return eip
+ getStaticFieldAddr reip >>= poke imm_ptr
+ return reip
else error "staticFieldHandler: something is wrong here. abort.\n"
-instanceOfMissHandler :: CPtrdiff -> B.ByteString -> IO CPtrdiff
-instanceOfMissHandler eip classname = do
- -- first byte is going to be the opcode
- let insn_ptr = intPtrToPtr (fromIntegral eip) :: Ptr CUChar
- -- the next four bytes are the immediate
- let imm_ptr = intPtrToPtr (fromIntegral (eip + 1)) :: Ptr CPtrdiff
- checkMe <- peek imm_ptr
- if checkMe == 0x909090ff then -- safety check...
- do
- mtable <- getMethodTable classname
- poke imm_ptr (fromIntegral mtable)
- poke insn_ptr 0xba -- `mov edx' opcode
- return eip
- else error "instanceOfMissHandler: something is wrong here. abort.\n"
-
-invokeHandler :: CPtrdiff -> CPtrdiff -> CPtrdiff -> Bool -> IO CPtrdiff
-invokeHandler method_table table2patch esp imm8 = do
- -- table2patch: note, that can be a method-table or a interface-table
- callerAddr <- callerAddrFromStack esp
- offset <- if imm8 then offsetOfCallInsn8 esp else offsetOfCallInsn32 esp
- entryAddr <- getMethodEntry callerAddr method_table
- let call_insn = intPtrToPtr (fromIntegral $ table2patch + fromIntegral offset)
- poke call_insn entryAddr
- return entryAddr
-
-
-callerAddrFromStack :: CPtrdiff -> IO CPtrdiff
-callerAddrFromStack = peek . intPtrToPtr . fromIntegral
-
-offsetOfCallInsn8 :: CPtrdiff -> IO CPtrdiff
-offsetOfCallInsn8 esp = do
- let ret_ptr = intPtrToPtr (fromIntegral esp) :: Ptr CPtrdiff
- ret <- peek ret_ptr
- retval <- peek (intPtrToPtr (fromIntegral (ret - 1)) :: Ptr CUChar)
- return $ fromIntegral retval
-
-offsetOfCallInsn32 :: CPtrdiff -> IO CPtrdiff
-offsetOfCallInsn32 esp = do
- let ret_ptr = intPtrToPtr (fromIntegral esp) :: Ptr CPtrdiff
- ret <- peek ret_ptr
- peek (intPtrToPtr $ fromIntegral (ret - 4))
+patchInstanceOf :: CPtrdiff -> B.ByteString -> CodeGen e s CPtrdiff
+patchInstanceOf reip classname = do
+ mtable <- liftIO $ getMethodTable classname
+ mov edx mtable
+ return reip
+
+patchNewObject :: CPtrdiff -> B.ByteString -> CodeGen e s CPtrdiff
+patchNewObject reip classname = do
+ objsize <- liftIO $ getObjectSize classname
+ push32 objsize
+ callMalloc
+ mtable <- liftIO $ getMethodTable classname
+ mov (Disp 0, eax) mtable
+ return reip
+
+patchInvoke :: CPtrdiff -> CPtrdiff -> IO NativeWord -> CPtrdiff -> CodeGen e s CPtrdiff
+patchInvoke method_table table2patch io_offset reip = do
+ offset <- liftIO io_offset
+ entryAddr <- liftIO $ getMethodEntry reip method_table
+ call32_eax (Disp offset)
+ -- patch entry in table
+ let call_insn = intPtrToPtr . fromIntegral $ table2patch + fromIntegral offset
+ liftIO $ poke call_insn entryAddr
+ return reip
projects / mate.git / blobdiff