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Cxbx-Reloaded
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Small EmuX86 improvements. 

Dashboard now runs with DSOUND_LLE enabled, but takes a long time to boot up
This commit is contained in:
Luke Usher 2016-11-30 20:25:06 +00:00
parent f45e8dd8fc
commit 45b7a71638
1 changed files with 37 additions and 15 deletions
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42
src/CxbxKrnl/EmuX86.cpp
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@ -84,7 +84,7 @@ void EmuX86_Write32(uint32_t addr, uint32_t value)
EmuWarning("EmuX86_Write32: Unknown Write Address %08X (value %08X)", addr, value); EmuWarning("EmuX86_Write32: Unknown Write Address %08X (value %08X)", addr, value);
} }
DWORD* EmuX86_GetRegisterPointer(LPEXCEPTION_POINTERS e, Zydis::Register reg) inline DWORD* EmuX86_GetRegisterPointer(LPEXCEPTION_POINTERS e, Zydis::Register reg)
{ {
switch (reg) { switch (reg) {
case Zydis::Register::AL: case Zydis::Register::AH: case Zydis::Register::AX: case Zydis::Register::EAX: case Zydis::Register::AL: case Zydis::Register::AH: case Zydis::Register::AX: case Zydis::Register::EAX:
@ -106,7 +106,7 @@ DWORD* EmuX86_GetRegisterPointer(LPEXCEPTION_POINTERS e, Zydis::Register reg)
return nullptr; return nullptr;
} }
bool EmuX86_GetRegisterValue(uint32_t* output, LPEXCEPTION_POINTERS e, Zydis::Register reg) inline bool EmuX86_GetRegisterValue(uint32_t* output, LPEXCEPTION_POINTERS e, Zydis::Register reg)
{ {
uint32_t value = 0; uint32_t value = 0;
@ -123,7 +123,7 @@ bool EmuX86_GetRegisterValue(uint32_t* output, LPEXCEPTION_POINTERS e, Zydis::Re
return true; return true;
} }
bool EmuX86_DecodeMemoryOperand(uint32_t* output, LPEXCEPTION_POINTERS e, Zydis::OperandInfo& operand) inline bool EmuX86_DecodeMemoryOperand(uint32_t* output, LPEXCEPTION_POINTERS e, Zydis::OperandInfo& operand)
{ {
uint32_t base = 0; uint32_t base = 0;
uint32_t index = 0; uint32_t index = 0;
@ -225,13 +225,16 @@ bool EmuX86_MOV(LPEXCEPTION_POINTERS e, Zydis::InstructionInfo& info)
return false; return false;
} }
void EmuX86_SetFlag(LPEXCEPTION_POINTERS e, int flag, int value) inline void EmuX86_SetFlag(LPEXCEPTION_POINTERS e, int flag, int value)
{ {
e->ContextRecord->EFlags ^= (-value ^ e->ContextRecord->EFlags) & (1 << flag); e->ContextRecord->EFlags ^= (-value ^ e->ContextRecord->EFlags) & (1 << flag);
} }
bool EmuX86_TEST(LPEXCEPTION_POINTERS e, Zydis::InstructionInfo& info) bool EmuX86_TEST(LPEXCEPTION_POINTERS e, Zydis::InstructionInfo& info)
{ {
uint32_t result = 0;
bool handled = false;
if (info.operand[0].type == Zydis::OperandType::MEMORY && info.operand[1].type == Zydis::OperandType::IMMEDIATE) if (info.operand[0].type == Zydis::OperandType::MEMORY && info.operand[1].type == Zydis::OperandType::IMMEDIATE)
{ {
uint32_t addr = 0; uint32_t addr = 0;
@ -243,7 +246,31 @@ bool EmuX86_TEST(LPEXCEPTION_POINTERS e, Zydis::InstructionInfo& info)
uint32_t value = EmuX86_Read32(addr); uint32_t value = EmuX86_Read32(addr);
// Perform bitwise AND // Perform bitwise AND
uint32_t result = value & info.operand[1].lval.udword; result = value & info.operand[1].lval.udword;
handled = true;
}
else if (info.operand[0].type == Zydis::OperandType::MEMORY && info.operand[1].type == Zydis::OperandType::REGISTER)
{
uint32_t addr = 0;
uint32_t value = 0;
if (!EmuX86_DecodeMemoryOperand(&addr, e, info.operand[0])) {
return false;
}
if (!EmuX86_GetRegisterValue(&value, e, info.operand[1].base)) {
return false;
}
// Perform bitwise AND
result = EmuX86_Read32(addr) & value;
handled = true;
}
if (!handled) {
return false;
}
// Set CF/OF to 0 // Set CF/OF to 0
EmuX86_SetFlag(e, EMUX86_EFLAG_CF, 0); EmuX86_SetFlag(e, EMUX86_EFLAG_CF, 0);
@ -253,13 +280,9 @@ bool EmuX86_TEST(LPEXCEPTION_POINTERS e, Zydis::InstructionInfo& info)
EmuX86_SetFlag(e, EMUX86_EFLAG_ZF, result == 0 ? 1 : 0); EmuX86_SetFlag(e, EMUX86_EFLAG_ZF, result == 0 ? 1 : 0);
// TODO: Parity Flag // TODO: Parity Flag
return true; return true;
} }
return false;
}
bool EmuX86_DecodeException(LPEXCEPTION_POINTERS e) bool EmuX86_DecodeException(LPEXCEPTION_POINTERS e)
{ {
// Only decode instructions within Xbox memory space // Only decode instructions within Xbox memory space
@ -284,7 +307,6 @@ bool EmuX86_DecodeException(LPEXCEPTION_POINTERS e)
} }
else else
{ {
DbgPrintf("EmuX86: 0x%08X: %s\n", e->ContextRecord->Eip, formatter.formatInstruction(info));
switch (info.mnemonic) switch (info.mnemonic)
{ {
case Zydis::InstructionMnemonic::MOV: case Zydis::InstructionMnemonic::MOV: