Simplify FireException a lot

src/backend/core/registers/Cop0.cpp

@@ -375,7 +375,17 @@ FORCE_INLINE bool Is64BitAddressing(const Cop0 &cp0, const u64 addr) {
 
 void Cop0::FireException(const ExceptionCode code, const int cop, s64 pc) {
   Registers& regs = Core::GetRegs();
-  const bool old_exl = status.exl;
+
+  u16 vectorOffset = 0x0180;
+  if(tlbError == MISS && (code == ExceptionCode::TLBLoad || code == ExceptionCode::TLBStore)) {
+    if(!status.exl) {
+      if(Is64BitAddressing(*this, badVaddr)) vectorOffset = 0x0080;
+      else vectorOffset = 0x0000;
+    }
+  }
+
+  cause.copError = cop;
+  cause.exceptionCode = static_cast<u8>(code);
 
   if (!status.exl) {
     if ((cause.branchDelay = regs.prevDelaySlot)) {
@@ -386,45 +396,12 @@ void Cop0::FireException(const ExceptionCode code, const int cop, s64 pc) {
     EPC = pc;
   }
 
-  cause.copError = cop;
-  cause.exceptionCode = static_cast<u8>(code);
-
   if (status.bev) {
     panic("BEV bit set!");
-  } else {
-    switch (code) {
-    case ExceptionCode::Interrupt:
-    case ExceptionCode::TLBModification:
-    case ExceptionCode::AddressErrorLoad:
-    case ExceptionCode::AddressErrorStore:
-    case ExceptionCode::InstructionBusError:
-    case ExceptionCode::DataBusError:
-    case ExceptionCode::Syscall:
-    case ExceptionCode::Breakpoint:
-    case ExceptionCode::ReservedInstruction:
-    case ExceptionCode::CoprocessorUnusable:
-    case ExceptionCode::Overflow:
-    case ExceptionCode::Trap:
-    case ExceptionCode::FloatingPointError:
-    case ExceptionCode::Watch:
-      regs.SetPC32(s32(0x80000180));
-      break;
-    case ExceptionCode::TLBLoad:
-    case ExceptionCode::TLBStore:
-      if (old_exl || regs.cop0.tlbError == INVALID) {
-        regs.SetPC32(s32(0x80000180));
-      } else if (Is64BitAddressing(regs.cop0, regs.cop0.badVaddr)) {
-        regs.SetPC32(s32(0x80000080));
-      } else {
-        regs.SetPC32(s32(0x80000000));
-      }
-      break;
-    default:
-      panic("Unhandled exception! {}", static_cast<u8>(code));
-    }
   }
 
-  regs.cop0.Update();
+  regs.SetPC32(s32(0x80000000 + vectorOffset));
+  Update();
 }
 
 void Cop0::HandleTLBException(const u64 vaddr) {