CPU: Don't raise #RI on write to read-only COP0 registers

Should be silently ignored instead apparently.

src/core/cpu_core.cpp

@@ -1796,12 +1796,6 @@ restart_instruction:
               }
               break;
 
-              case Cop0Reg::JUMPDEST:
-              {
-                WARNING_LOG("Ignoring write to Cop0 JUMPDEST");
-              }
-              break;
-
               case Cop0Reg::DCIC:
               {
                 g_state.cop0_regs.dcic.bits = (g_state.cop0_regs.dcic.bits & ~Cop0Registers::DCIC::WRITE_MASK) |
@@ -1834,6 +1828,15 @@ restart_instruction:
               }
               break;
 
+              case Cop0Reg::JUMPDEST:
+              case Cop0Reg::BadVaddr:
+              case Cop0Reg::EPC:
+              {
+                WARNING_LOG("Ignoring write to COP0 register {} value 0x{:08X}",
+                            GetCop0RegisterName(static_cast<u8>(inst.r.rd.GetValue())), value);
+              }
+              break;
+
               [[unlikely]] default:
                 RaiseException(Exception::RI);
                 return;

src/core/cpu_disasm.cpp

@@ -385,7 +385,7 @@ void CPU::FormatInstruction(SmallStringBase* dest, const Instruction inst, u32 p
     }
     else if (std::strncmp(str, "cop", 3) == 0)
     {
-      dest->append_format("{}", static_cast<u8>(inst.op.GetValue()) & INSTRUCTION_COP_N_MASK);
+      dest->append_format("{}", inst.cop.cop_n.GetValue());
       str += 3;
     }
     else

src/core/cpu_types.h

@@ -110,9 +110,6 @@ enum class InstructionOp : u8
   swc2 = 58,
   swc3 = 59,
 };
-constexpr u8 INSTRUCTION_COP_BITS = 0x10;
-constexpr u8 INSTRUCTION_COP_MASK = 0x3C;
-constexpr u8 INSTRUCTION_COP_N_MASK = 0x03;
 
 enum class InstructionFunct : u8
 {