-{-# LANGUAGE OverloadedStrings #-}
-{-# LANGUAGE TemplateHaskell, FlexibleInstances #-}
-{-# LANGUAGE ForeignFunctionInterface #-}
-module Main where
-
-import Data.Binary
-import Data.String
-import System.Environment hiding (getEnv)
-import qualified Data.Map as M
-import qualified Data.ByteString.Lazy as B
-
-import Text.Printf
-
-import Control.Monad
-
-import qualified JVM.Assembler as J
-import JVM.Assembler hiding (Instruction)
-import JVM.Common
-import JVM.ClassFile
-import JVM.Converter
-import JVM.Dump
-
-import Foreign
-import Foreign.Ptr
-import Foreign.C.Types
-
-import Harpy
-import Harpy.X86Disassembler
-
-
-foreign import ccall "dynamic"
- code_void :: FunPtr (CInt -> IO CInt) -> (CInt -> IO CInt)
-
-foreign import ccall "getaddr"
- getaddr :: CUInt
-
-foreign import ccall "callertrap"
- callertrap :: IO ()
-
-
-$(callDecl "callAsWord32" [t|Word32|])
-
-main = do
- args <- getArgs
- case args of
- [clspath] -> do
- clsFile <- decodeFile clspath
- let cp = constsPool (clsFile :: Class Pointers)
- putStrLn "==== constpool: ===="
- putStrLn $ showListIx $ M.elems cp
- cf <- parseClassFile clspath
- putStrLn "==== classfile dump: ===="
- dumpClass cf
- putStrLn "==== random stuff: ===="
- let mainmethod = lookupMethod "main" cf -- "main|([Ljava/lang/String;)V" cf
- case mainmethod of
- Nothing -> putStrLn "no main found"
- Just main ->
- case attrByName main "Code" of
- Nothing -> putStrLn "no code attr found"
- Just bytecode -> do
- putStrLn "woot, running now"
- allocaArray 26 (\ p -> mapM_ (\ i -> poke (advancePtr p i) 0) [0..25] >> runstuff p bytecode)
- _ -> error "Synopsis: dump-class File.class"
-
-runstuff :: Ptr Int32 -> B.ByteString -> IO ()
-runstuff env bytecode = do
- let emittedcode = (compile (fromIntegral getaddr)) $ codeInstructions $ decodeMethod bytecode
- (_, Right ((entryPtr, endOffset), disasm)) <- runCodeGen emittedcode env ()
- printf "entry point: 0x%08x\n" ((fromIntegral $ ptrToIntPtr entryPtr) :: Int)
-
- let entryFuncPtr = ((castPtrToFunPtr entryPtr) :: FunPtr (CInt -> IO CInt))
- result <- code_void entryFuncPtr (fromIntegral 0x1337)
- let iresult::Int; iresult = fromIntegral result
- printf "result: 0x%08x\n" iresult -- expecting (2 * 0x1337) + 0x42 = 0x26b0
-
- result2 <- code_void entryFuncPtr (fromIntegral (-0x20))
- let iresult2::Int; iresult2 = fromIntegral result2
- printf "result: 0x%08x\n" iresult2 -- expecting 0x2
-
-
- -- s/mov ebx 0x6666/mov eax 0x6666/
- let patchit = plusPtr entryPtr 0xb
- poke patchit (0xb8 :: Word8)
-
- result3 <- code_void entryFuncPtr (fromIntegral 0)
- let iresult3::Int; iresult3 = fromIntegral result3
- printf "result: 0x%08x\n" iresult3 -- expecting 0x6666
-
- printf "disasm:\n"
- mapM_ (putStrLn . showAtt) disasm
-
- printf "patched disasm:\n"
- Right newdisasm <- disassembleBlock entryPtr endOffset
- mapM_ (putStrLn . showAtt) $ newdisasm
-
- let addr :: Int; addr = (fromIntegral getaddr :: Int)
- printf "getaddr: 0x%08x\n" addr
-
- return ()
-
-
-entryCode :: CodeGen e s ()
-entryCode = do push ebp
- mov ebp esp
-
-exitCode :: CodeGen e s ()
-exitCode = do mov esp ebp
- pop ebp
- ret
-
-compile :: Word32 -> [J.Instruction] -> CodeGen (Ptr Int32) s ((Ptr Word8, Int), [Instruction])
-compile trapaddr insn = do
- entryCode
- mapM compile_ins insn
- push eax
- mov ecx (trapaddr :: Word32)
- call ecx
- -- call trapaddr -- Y U DON'T WORK? (ask mr. gdb for help)
- pop eax
- exitCode
- d <- disassemble
- c <- getEntryPoint
- end <- getCodeOffset
- return ((c,end),d)
-
-compile_ins :: J.Instruction -> CodeGen (Ptr Int32) s ()
-compile_ins (BIPUSH w8) = do mov eax ((fromIntegral w8) :: Word32)
-compile_ins (PUTSTATIC w16) = do add eax (Disp 8, ebp) -- add first argument to %eax
-compile_ins (GETSTATIC w16) = do nop
-compile_ins ICONST_2 = do mov ebx (0x6666 :: Word32) -- patch me!
-compile_ins IMUL = do nop
- -- mov eax (0 :: Word32)
- -- jmp eax
-compile_ins RETURN = do nop
-compile_ins _ = do nop
-
--- TODO: actually this function already exists in hs-java-0.3!
-lookupMethod :: B.ByteString -> Class Resolved -> Maybe (Method Resolved)
-lookupMethod name cls = look (classMethods cls)
- where
- look [] = Nothing
- look (f:fs)
- | methodName f == name = Just f
- | otherwise = look fs