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Cxbx-Reloaded
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Merge pull request #1454 from LukeUsher/x86-tweaks 

X86 tweaks: Fixes WWE Raw LLE regression
This commit is contained in:
Luke Usher 2018-09-27 22:36:50 +01:00 committed by GitHub
parent ae572166f1 42aae20d8e
commit 2918526586
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 57 additions and 7 deletions
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64
src/CxbxKrnl/EmuX86.cpp
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@ -725,6 +725,30 @@ inline bool EmuX86_HasFlag_ZF(LPEXCEPTION_POINTERS e)
// See http://x86.renejeschke.de/ for affected CPU flags per instruction
void SignExtend32(uint32_t& dest, size_t from)
{
int32_t signExtended = 0;
switch (from) {
case 8:
signExtended = (int8_t)dest;
break;
case 16:
signExtended = (int16_t)dest;
break;
default:
assert(false);
break;
}
#if 0
if ((uint32_t)signExtended != dest) {
DebugBreak();
}
#endif
dest = (uint32_t)signExtended;
}
// Keep opcode emulations alphabetically ordered :
bool EmuX86_Opcode_ADD(LPEXCEPTION_POINTERS e, _DInst& info)
@ -739,7 +763,10 @@ bool EmuX86_Opcode_ADD(LPEXCEPTION_POINTERS e, _DInst& info)
if (!EmuX86_Operand_Addr_ForReadWrite(e, info, 0, OUT opAddr))
return false;
const uint32_t dest = EmuX86_Addr_Read(opAddr);
uint32_t dest = EmuX86_Addr_Read(opAddr);
if (info.ops[0].size > info.ops[1].size) {
SignExtend32(src, info.ops[1].size);
}
uint32_t result = 0;
uint32_t eflags = e->ContextRecord->EFlags;
@ -776,6 +803,10 @@ bool EmuX86_Opcode_AND(LPEXCEPTION_POINTERS e, _DInst& info)
uint32_t dest = EmuX86_Addr_Read(opAddr);
if (info.ops[0].size > info.ops[1].size) {
SignExtend32(src, info.ops[1].size);
}
uint32_t result = 0;
uint32_t eflags = e->ContextRecord->EFlags;
__asm {
@ -817,6 +848,10 @@ bool EmuX86_Opcode_CMP(LPEXCEPTION_POINTERS e, _DInst& info)
uint32_t dest = 0;
if (!EmuX86_Operand_Read(e, info, 0, &dest))
return false;
if (info.ops[0].size > info.ops[1].size) {
SignExtend32(src, info.ops[1].size);
}
uint32_t eflags = e->ContextRecord->EFlags;
__asm {
@ -845,7 +880,6 @@ bool EmuX86_Opcode_CMPXCHG(LPEXCEPTION_POINTERS e, _DInst& info)
if (!EmuX86_Operand_Read(e, info, 0, &dest))
return false;
uint32_t mask;
switch (info.ops[0].size) {
case 8: mask = 0xFF; break; // TODO : Needs test-case
@ -1143,7 +1177,7 @@ bool EmuX86_Opcode_NOT(LPEXCEPTION_POINTERS e, _DInst& info)
OperandAddress opAddr;
if (!EmuX86_Operand_Addr_ForReadWrite(e, info, 0, OUT opAddr))
return false;
uint32_t dest = EmuX86_Addr_Read(opAddr);
uint32_t result = 0;
uint32_t eflags = e->ContextRecord->EFlags;
@ -1180,7 +1214,10 @@ bool EmuX86_Opcode_OR(LPEXCEPTION_POINTERS e, _DInst& info)
if (!EmuX86_Operand_Addr_ForReadWrite(e, info, 0, OUT opAddr))
return false;
uint32_t dest = EmuX86_Addr_Read(opAddr);
uint32_t dest = EmuX86_Addr_Read(opAddr);
if (info.ops[0].size > info.ops[1].size) {
SignExtend32(src, info.ops[1].size);
}
uint32_t result = 0;
uint32_t eflags = e->ContextRecord->EFlags;
@ -1279,7 +1316,7 @@ bool EmuX86_Opcode_SAR(LPEXCEPTION_POINTERS e, _DInst& info)
return false;
uint32_t dest = EmuX86_Addr_Read(opAddr);
uint32_t result = 0;
uint32_t eflags = e->ContextRecord->EFlags;
uint8_t byteSrc = src;
@ -1318,6 +1355,10 @@ bool EmuX86_Opcode_SBB(LPEXCEPTION_POINTERS e, _DInst& info)
uint32_t dest = EmuX86_Addr_Read(opAddr);
if (info.ops[0].size > info.ops[1].size) {
SignExtend32(src, info.ops[1].size);
}
uint32_t result = 0;
uint32_t eflags = e->ContextRecord->EFlags;
__asm {
@ -1399,8 +1440,9 @@ bool EmuX86_Opcode_SHR(LPEXCEPTION_POINTERS e, _DInst& info)
if (!EmuX86_Operand_Addr_ForReadWrite(e, info, 0, OUT opAddr))
return false;
uint32_t dest = EmuX86_Addr_Read(opAddr);
uint32_t dest = EmuX86_Addr_Read(opAddr);
uint32_t result = 0;
uint32_t eflags = e->ContextRecord->EFlags;
uint8_t byteSrc = src;
@ -1444,6 +1486,10 @@ bool EmuX86_Opcode_SUB(LPEXCEPTION_POINTERS e, _DInst& info)
return false;
uint32_t dest = EmuX86_Addr_Read(opAddr);
if (info.ops[0].size > info.ops[1].size) {
SignExtend32(src, info.ops[1].size);
}
uint32_t result = 0;
uint32_t eflags = e->ContextRecord->EFlags;
@ -1509,6 +1555,10 @@ bool EmuX86_Opcode_XOR(LPEXCEPTION_POINTERS e, _DInst& info)
uint32_t dest = EmuX86_Addr_Read(opAddr);
if (info.ops[0].size > info.ops[1].size) {
SignExtend32(src, info.ops[1].size);
}
uint32_t result = 0;
uint32_t eflags = e->ContextRecord->EFlags;
__asm {
@ -2861,7 +2911,7 @@ bool EmuX86_DecodeException(LPEXCEPTION_POINTERS e)
// Execute op-codes until we hit an unhandled instruction, or an error occurs
while (true)
//for (int x=0;x<1;x++)
//for (int x=0;x<3;x++)
{
if (!EmuX86_DecodeOpcode((uint8_t*)e->ContextRecord->Eip, info)) {
EmuLog(LOG_PREFIX, LOG_LEVEL::WARNING, "Error decoding opcode at 0x%08X", e->ContextRecord->Eip);