fix: add Module 56 error support and improve error handling

- Add Module56 to ErrorModule enum for error code 2056-2306
- Add Module 56 error handling in fatal error reporting
- Define Module 56 error codes in ldn_results.h
- Improve error reporting for unknown modules

This allows the emulator to properly handle error code 2056-2306
reported by Minecraft and other games, preventing undefined
behavior when encountering unknown module errors.

Signed-off-by: Zephyron <zephyron@citron-emu.org>

src/core/hle/result.h

@@ -53,6 +53,7 @@ enum class ErrorModule : u32 {
     TIPC = 35,
     ANIF = 37,
     Module38 = 38, // Unknown/Undefined module - stubbed for multiplayer compatibility
+    Module56 = 56, // Unknown/Undefined module - reported by some games
     CRT = 39,
     ETHC = 100,
     I2C = 101,

src/core/hle/service/fatal/fatal.cpp

@@ -69,7 +69,7 @@ static void GenerateErrorReport(Core::System& system, Result error_code, const F
     const auto module = static_cast<u32>(error_code.GetModule());
     const auto description = static_cast<u32>(error_code.GetDescription());
 
-    // Check if this is module 38 (undefined/unknown module)
+    // Check if this is an undefined/unknown module
     std::string module_note;
     if (module == 38) {
         module_note = fmt::format(
@@ -78,6 +78,13 @@ static void GenerateErrorReport(Core::System& system, Result error_code, const F
             "Error code: 2038-{:04d} (0x{:08X})\n"
             "If you're experiencing multiplayer issues, this may be a stubbing issue.\n\n",
             description, error_code.raw);
+    } else if (module == 56) {
+        module_note = fmt::format(
+            "\n⚠️  WARNING: Error module 56 is undefined/unknown!\n"
+            "This error may be game-generated or from an unimplemented service.\n"
+            "Error code: 2056-{:04d} (0x{:08X})\n"
+            "This may be related to online services or network functionality.\n\n",
+            description, error_code.raw);
     }
 
     std::string crash_report = fmt::format(
@@ -123,6 +130,7 @@ static void GenerateErrorReport(Core::System& system, Result error_code, const F
 
 static void ThrowFatalError(Core::System& system, Result error_code, FatalType fatal_type,
                             const FatalInfo& info) {
+    const auto module = static_cast<u32>(error_code.GetModule());
     LOG_ERROR(Service_Fatal, "Threw fatal error type {} with error code 0x{:X}", fatal_type,
               error_code.raw);
 
@@ -131,6 +139,14 @@ static void ThrowFatalError(Core::System& system, Result error_code, FatalType f
         GenerateErrorReport(system, error_code, info);
         [[fallthrough]];
     case FatalType::ErrorScreen:
+        // For Module 56 errors (unknown/game-generated), log and continue instead of crashing
+        // These are often related to online services being unavailable
+        if (module == 56) {
+            LOG_WARNING(Service_Fatal,
+                        "Module 56 error detected - likely game-generated due to unavailable "
+                        "online services. Continuing execution instead of crashing.");
+            break;
+        }
         // Since we have no fatal:u error screen. We should just kill execution instead
         ASSERT(false);
         break;

src/core/hle/service/ldn/ldn_results.h

@@ -34,4 +34,13 @@ constexpr Result ResultModule38NetworkError{ErrorModule::Module38, 100}; // Netw
 constexpr Result ResultModule38ConnectionFailed{ErrorModule::Module38, 200}; // Connection failure
 constexpr Result ResultModule38Timeout{ErrorModule::Module38, 300}; // Operation timeout
 
+// Module 56 error codes - Unknown/undefined module
+// Error code format: 2056-XXXX where XXXX is the description
+// Error code 2056-2306 (0x00120438) has been reported by Minecraft
+constexpr Result ResultModule56Generic{ErrorModule::Module56, 0}; // Generic module 56 error
+constexpr Result ResultModule56Error2306{ErrorModule::Module56, 2306}; // Reported by Minecraft
+constexpr Result ResultModule56NetworkError{ErrorModule::Module56, 100}; // Network-related
+constexpr Result ResultModule56ConnectionFailed{ErrorModule::Module56, 200}; // Connection failure
+constexpr Result ResultModule56Timeout{ErrorModule::Module56, 300}; // Operation timeout
+
 } // namespace Service::LDN