-{-# LANGUAGE CPP #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ForeignFunctionInterface #-}
-#include "debug.h"
module Mate.X86CodeGen where
import Prelude hiding (and, div)
import qualified Data.Map as M
import qualified Data.ByteString.Lazy as B
import Control.Monad
+import Control.Applicative
import Foreign hiding (xor)
import Foreign.C.Types
import Mate.Types
import Mate.Utilities
import Mate.ClassPool
+import Mate.ClassHierarchy
+import {-# SOURCE #-} Mate.MethodPool
import Mate.Strings
-#ifdef DEBUG
-import Text.Printf
-#endif
-foreign import ccall "&mallocObject"
+foreign import ccall "&mallocObjectGC"
mallocObjectAddr :: FunPtr (Int -> IO CPtrdiff)
type EntryPoint = Ptr Word8
-- causes SIGILL. in the signal handler we patch it to the acutal call.
-- place two nop's at the end, therefore the disasm doesn't screw up
emit32 (0x9090ffff :: Word32); nop
+ let patcher reip = do
+ entryAddr <- liftIO $ getMethodEntry l
+ call (fromIntegral (entryAddr - (reip + 5)) :: NativeWord)
+ return reip
-- discard arguments on stack
let argcnt = ((if hasThis then 1 else 0) + methodGetArgsCount (methodNameTypeByIdx cls cpidx)) * ptrSize
when (argcnt > 0) (add esp argcnt)
-- push result on stack if method has a return value
when (methodHaveReturnValue cls cpidx) (push eax)
- return $ Just (calladdr, StaticMethod l)
+ return $ Just (calladdr, StaticMethod patcher)
virtualCall :: Word16 -> Bool -> CodeGen e s (Maybe (Word32, TrapCause))
virtualCall cpidx isInterface = do
emit' (INVOKESTATIC cpidx) = emitInvoke cpidx False
emit' (INVOKEINTERFACE cpidx _) = virtualCall cpidx True
emit' (INVOKEVIRTUAL cpidx) = virtualCall cpidx False
+
emit' (PUTSTATIC cpidx) = do
pop eax
trapaddr <- getCurrentOffset
mov eax (Addr 0x00000000) -- it's a trap
push eax
return $ Just (trapaddr, StaticField $ buildStaticFieldID cls cpidx)
+
+ emit' (GETFIELD x) = do
+ pop eax -- this pointer
+ trapaddr <- getCurrentOffset
+ -- like: 099db064 ff b0 e4 14 00 00 pushl 5348(%eax)
+ emit32 (0x9090ffff :: Word32); nop; nop
+ let patcher reip = do
+ let (cname, fname) = buildFieldOffset cls x
+ offset <- liftIO $ fromIntegral <$> getFieldOffset cname fname
+ push32_rel_eax (Disp offset) -- get field
+ return reip
+ return $ Just (trapaddr, ObjectField patcher)
+ emit' (PUTFIELD x) = do
+ pop ebx -- value to write
+ pop eax -- this pointer
+ trapaddr <- getCurrentOffset
+ -- like: 4581fc6b 89 98 30 7b 00 00 movl %ebx,31536(%eax)
+ emit32 (0x9090ffff :: Word32); nop; nop
+ let patcher reip = do
+ let (cname, fname) = buildFieldOffset cls x
+ offset <- liftIO $ fromIntegral <$> getFieldOffset cname fname
+ mov32_rel_ebx_eax (Disp offset) -- set field
+ return reip
+ return $ Just (trapaddr, ObjectField patcher)
+
emit' (INSTANCEOF cpidx) = do
pop eax
mov eax (Disp 0, eax) -- mtable of objectref
trapaddr <- getCurrentOffset
-- place something like `mov edx $mtable_of_objref' instead
emit32 (0x9090ffff :: Word32); nop
- cmp eax edx
- sete al
- movzxb eax al
- push eax
- forceRegDump
- return $ Just (trapaddr, InstanceOf $ buildClassID cls cpidx)
+ push (0 :: Word32)
+ let patcher reax reip = do
+ -- mtable <- liftIO $ getMethodTable (buildClassID cls cpidx)
+ -- mov edx mtable
+ emit32 (0x9090ffff :: Word32); nop
+ let classname = buildClassID cls cpidx
+ check <- liftIO $ isInstanceOf (fromIntegral reax) classname
+ if check
+ then push (1 :: Word32)
+ else push (0 :: Word32)
+ return (reip + 5)
+ -- cmp eax edx
+ -- sete al
+ -- movzxb eax al
+ -- push eax
+ -- forceRegDump
+ return $ Just (trapaddr, InstanceOf patcher)
emit' (NEW objidx) = do
let objname = buildClassID cls objidx
trapaddr <- getCurrentOffset
callMalloc
-- 0x13371337 is just a placeholder; will be replaced with mtable ptr
mov (Disp 0, eax) (0x13371337 :: Word32)
- return $ Just (trapaddr, NewObject objname)
+ mov (Disp 4, eax) (0x1337babe :: Word32)
+ let patcher reip = do
+ objsize <- liftIO $ getObjectSize objname
+ push32 objsize
+ callMalloc
+ mtable <- liftIO $ getMethodTable objname
+ mov (Disp 0, eax) mtable
+ mov (Disp 4, eax) (0x1337babe :: Word32)
+ return reip
+ return $ Just (trapaddr, NewObject patcher)
emit' insn = emit insn >> return Nothing
(CInteger i) -> liftIO $ return i
e -> error $ "LDCI... missing impl.: " ++ show e
push value
- emit (GETFIELD x) = do
- offset <- emitFieldOffset x
- push (Disp (fromIntegral offset), eax) -- get field
- emit (PUTFIELD x) = do
- pop ebx -- value to write
- offset <- emitFieldOffset x
- mov (Disp (fromIntegral offset), eax) ebx -- set field
emit IADD = do pop ebx; pop eax; add eax ebx; push eax
emit ISUB = do pop ebx; pop eax; sub eax ebx; push eax
emit IRETURN = do pop eax; emit RETURN
emit invalid = error $ "insn not implemented yet: " ++ show invalid
- emitFieldOffset :: Word16 -> CodeGen e s Int32
- emitFieldOffset x = do
- pop eax -- this pointer
- let (cname, fname) = buildFieldOffset cls x
- liftIO $ getFieldOffset cname fname
-
emitIF :: CMP -> CodeGen e s ()
emitIF cond = let
sid = case successor bb of TwoTarget _ t -> t; _ -> error "bad"
add esp (ptrSize :: Word32)
push eax
--- the regular push implementation, considers the provided immediate and selects
--- a different instruction if it fits in 8bit. but this is not useful for
--- patching.
+
+-- harpy tries to cut immediates (or displacements), if they fit in 8bit.
+-- however, this is bad for patching so we want to put always 32bit.
+
+-- push imm32
push32 :: Word32 -> CodeGen e s ()
push32 imm32 = emit8 0x68 >> emit32 imm32
+-- call disp32(%eax)
call32_eax :: Disp -> CodeGen e s ()
call32_eax (Disp disp32) = emit8 0xff >> emit8 0x90 >> emit32 disp32
+
+-- push disp32(%eax)
+push32_rel_eax :: Disp -> CodeGen e s ()
+push32_rel_eax (Disp disp32) = emit8 0xff >> emit8 0xb0 >> emit32 disp32
+
+-- mov %ebx, disp32(%eax)
+mov32_rel_ebx_eax :: Disp -> CodeGen e s ()
+mov32_rel_ebx_eax (Disp disp32) = emit8 0x89 >> emit8 0x98 >> emit32 disp32
projects / mate.git / blobdiff