1 {-# LANGUAGE OverloadedStrings #-}
2 {-# LANGUAGE ForeignFunctionInterface #-}
3 module Mate.X86TrapHandling (
9 import qualified Data.Map as M
13 import Foreign.C.Types
15 import Harpy hiding (fst)
18 import Mate.NativeSizes
19 import {-# SOURCE #-} Mate.MethodPool
21 import Mate.X86CodeGen
24 import Harpy.X86Disassembler
26 foreign import ccall "register_signal"
27 register_signal :: IO ()
29 foreign export ccall mateHandler :: CPtrdiff -> CPtrdiff -> CPtrdiff -> CPtrdiff -> IO CPtrdiff
30 mateHandler :: CPtrdiff -> CPtrdiff -> CPtrdiff -> CPtrdiff -> IO CPtrdiff
31 mateHandler reip reax rebx resi = do
33 let reipw32 = fromIntegral reip
34 (deleteMe, ret_nreip) <- case M.lookup reipw32 tmap of
35 (Just (StaticMethod patcher)) ->
36 patchWithHarpy patcher reip >>= delFalse
37 (Just (StaticField _)) ->
38 staticFieldHandler reip >>= delTrue
39 (Just (ObjectField patcher)) ->
40 patchWithHarpy patcher reip >>= delTrue
41 (Just (InstanceOf patcher)) ->
42 patchWithHarpy (patcher reax) reip >>= delFalse
43 (Just (NewObject patcher)) ->
44 patchWithHarpy patcher reip >>= delTrue
45 (Just (VirtualCall False mi io_offset)) ->
46 patchWithHarpy (patchInvoke mi reax reax io_offset) reip
48 (Just (VirtualCall True mi io_offset)) ->
49 patchWithHarpy (patchInvoke mi rebx reax io_offset) reip
51 Nothing -> case resi of
52 0x13371234 -> delFalse (-1)
53 _ -> error $ "getTrapType: abort :-( " ++ showHex reip ". "
54 ++ concatMap (`showHex` ", ") (M.keys tmap)
55 when deleteMe $ setTrapMap $ M.delete reipw32 tmap
58 delTrue x = return (True,x)
59 delFalse x = return (False,x)
62 patchWithHarpy :: (CPtrdiff -> CodeGen () () CPtrdiff) -> CPtrdiff -> IO CPtrdiff
63 patchWithHarpy patcher reip = do
64 -- this is just an upperbound. if the value is to low, patching fails. find
67 let entry = Just (intPtrToPtr (fromIntegral reip), fixme)
68 let cgconfig = defaultCodeGenConfig { customCodeBuffer = entry }
69 (_, Right right) <- runCodeGenWithConfig (withDisasm $ patcher reip) () () cgconfig
70 when mateDEBUG $ mapM_ (printfJit . printf "patched: %s\n" . showAtt) $ snd right
73 withDisasm :: CodeGen e s CPtrdiff -> CodeGen e s (CPtrdiff, [Instruction])
74 withDisasm patcher = do
79 staticFieldHandler :: CPtrdiff -> IO CPtrdiff
80 staticFieldHandler reip = do
81 -- patch the offset here, first two bytes are part of the insn (opcode + reg)
82 let imm_ptr = intPtrToPtr (fromIntegral (reip + 2)) :: Ptr CPtrdiff
83 checkMe <- peek imm_ptr
84 if checkMe == 0x00000000 then
86 getStaticFieldAddr reip >>= poke imm_ptr
88 else error "staticFieldHandler: something is wrong here. abort.\n"
90 patchInvoke :: MethodInfo -> CPtrdiff -> CPtrdiff -> IO NativeWord -> CPtrdiff -> CodeGen e s CPtrdiff
91 patchInvoke (MethodInfo methname _ msig) method_table table2patch io_offset reip = do
92 vmap <- liftIO getVirtualMap
93 let newmi = MethodInfo methname (vmap M.! fromIntegral method_table) msig
94 offset <- liftIO io_offset
95 entryAddr <- liftIO $ getMethodEntry newmi
96 call32Eax (Disp offset)
97 -- patch entry in table
98 let call_insn = intPtrToPtr . fromIntegral $ table2patch + fromIntegral offset
99 liftIO $ poke call_insn entryAddr