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src/backend/core/Disassembler.cpp

@@ -185,11 +185,13 @@ Disassembler::DisassemblyResult Disassembler::DisassembleDetailed(const u32 addr
     switch (operand.type) {
     case MIPS_OP_IMM:
       return {std::format("#{:X}, ", operand.is_unsigned ? operand.uimm : operand.imm)};
-    case MIPS_OP_MEM:
+    case MIPS_OP_MEM: {
+      auto base = CapstoneToRegValue<std::optional<u64>>(operand.mem.base);
       return {
         std::format("{}(0x{:X}), ", CapstoneToRegValue<std::string>(operand.mem.base), operand.mem.disp),
-        CapstoneToRegValue<std::optional<u64>>(operand.mem.base).value() + (s16)operand.mem.disp,
+        base.has_value() ? base.value() + (s16)operand.mem.disp : 0xFFFF'FFFF'FFFF'FFFFull,
       };
+    }
     case MIPS_OP_REG:
       return {std::format("{}, ", CapstoneToRegValue<std::string>(operand.reg))};
     default:

src/backend/core/mmio/PI.cpp

@@ -399,7 +399,7 @@ void PI::BusWrite<false>(u32 addr, u64 val) {
     warn("Writing dword 0x{:016X} to address 0x{:08X} in unsupported region: REGION_PI_ROM", val, addr);
     break;
   default:
-    panic("Should never end up here! Access to address %08X which did not match any PI bus regions!", addr);
+    panic("Should never end up here! Access to address {:08X} which did not match any PI bus regions!", addr);
   }
 }
 

src/backend/core/mmio/VI.cpp

@@ -52,8 +52,12 @@ u32 VI::Read(const u32 paddr) const {
     return xscale.raw;
   case 0x04400034:
     return yscale.raw;
+  case 0x04400038:
+    return 0;
+  case 0x0440003C:
+    return 0;
   default:
-    panic("Unimplemented VI[%08X] read", paddr);
+    panic("Unimplemented VI[{:08X}] read", paddr);
   }
 }
 
@@ -111,8 +115,12 @@ void VI::Write(const u32 paddr, const u32 val) {
   case 0x04400034:
     yscale.raw = val;
     break;
+  case 0x04400038:
+    break;
+  case 0x0440003C:
+    break;
   default:
-    panic("Unimplemented VI[%08X] write (%08X)", paddr, val);
+    panic("Unimplemented VI[{:08X}] write ({:08X})", paddr, val);
   }
 }
 } // namespace n64