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Initial support for Read8/16 and Write8/16

This commit is contained in:
Luke Usher 2016-11-28 21:08:14 +00:00
parent 574977bf2f
commit 0789ab2358
1 changed files with 79 additions and 3 deletions
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82
src/CxbxKrnl/EmuX86.cpp
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@ -41,6 +41,19 @@
#include "EmuX86.h"
#include "EmuNV2A.h"
uint8_t EmuX86_Read8(uint32_t addr)
{
EmuWarning("EmuX86_Read8: Unknown Read Address %02X", addr);
return 0;
}
uint16_t EmuX86_Read16(uint32_t addr)
{
EmuWarning("EmuX86_Read16: Unknown Read Address %04X", addr);
return 0;
}
uint32_t EmuX86_Read32(uint32_t addr)
{
if (addr >= 0xFD000000 && addr <= 0xFE000000) {
@ -51,6 +64,16 @@ uint32_t EmuX86_Read32(uint32_t addr)
return 0;
}
void EmuX86_Write8(uint32_t addr, uint8_t value)
{
EmuWarning("EmuX86_Write8: Unknown Write Address %08X (value %02X)", addr, value);
}
void EmuX86_Write16(uint32_t addr, uint16_t value)
{
EmuWarning("EmuX86_Write8: Unknown Write Address %08X (value %04X)", addr, value);
}
void EmuX86_Write32(uint32_t addr, uint32_t value)
{
if (addr >= 0xFD000000 && addr <= 0xFE000000) {
@ -64,12 +87,24 @@ void EmuX86_Write32(uint32_t addr, uint32_t value)
DWORD* EmuX86_GetRegisterPointer(LPEXCEPTION_POINTERS e, Zydis::Register reg)
{
switch (reg) {
case Zydis::Register::AL:
case Zydis::Register::AH:
case Zydis::Register::AX:
case Zydis::Register::EAX:
return &e->ContextRecord->Eax;
case Zydis::Register::BL:
case Zydis::Register::BH:
case Zydis::Register::BX:
case Zydis::Register::EBX:
return &e->ContextRecord->Ebx;
case Zydis::Register::CL:
case Zydis::Register::CH:
case Zydis::Register::CX:
case Zydis::Register::ECX:
return &e->ContextRecord->Ecx;
case Zydis::Register::DL:
case Zydis::Register::DH:
case Zydis::Register::DX:
case Zydis::Register::EDX:
return &e->ContextRecord->Edx;
case Zydis::Register::EDI:
@ -128,7 +163,21 @@ bool EmuX86_MOV(LPEXCEPTION_POINTERS e, Zydis::InstructionInfo& info)
if (!EmuX86_DecodeMemoryOperand(&srcAddr, e, info.operand[1])) {
return false;
}
*pDstReg = EmuX86_Read32(srcAddr);
switch (info.operand[0].size) {
case 8:
*((uint8_t*)pDstReg + 3) = EmuX86_Read8(srcAddr);;
break;
case 16:
*((uint16_t*)pDstReg + 2) = EmuX86_Read16(srcAddr);
break;
case 32:
*pDstReg = EmuX86_Read32(srcAddr);
break;
default:
return false;
}
return true;
}
else if (info.operand[0].type == Zydis::OperandType::MEMORY && info.operand[1].type == Zydis::OperandType::REGISTER)
@ -144,7 +193,20 @@ bool EmuX86_MOV(LPEXCEPTION_POINTERS e, Zydis::InstructionInfo& info)
return false;
}
EmuX86_Write32(addr, value);
switch (info.operand[0].size) {
case 8:
EmuX86_Write8(addr, value & 0xFF);
break;
case 16:
EmuX86_Write16(addr, value & 0xFFFF);
break;
case 32:
EmuX86_Write32(addr, value);
break;
default:
return false;
}
return true;
}
else if (info.operand[0].type == Zydis::OperandType::MEMORY && info.operand[1].type == Zydis::OperandType::IMMEDIATE)
@ -155,7 +217,20 @@ bool EmuX86_MOV(LPEXCEPTION_POINTERS e, Zydis::InstructionInfo& info)
return false;
}
EmuX86_Write32(addr, info.operand[1].lval.udword);
switch (info.operand[0].size) {
case 8:
EmuX86_Write8(addr, info.operand[1].lval.ubyte);
break;
case 16:
EmuX86_Write16(addr, info.operand[1].lval.uword);
break;
case 32:
EmuX86_Write32(addr, info.operand[1].lval.udword);
break;
default:
return false;
}
return true;
}
@ -221,6 +296,7 @@ bool EmuX86_DecodeException(LPEXCEPTION_POINTERS e)
}
else
{
DbgPrintf("EmuX86: 0x%08X: %s\n", e->ContextRecord->Eip, formatter.formatInstruction(info));
switch (info.mnemonic)
{
case Zydis::InstructionMnemonic::MOV: