[Debug] Add cvar to support dumping xex file for debugging

src/xenia/emulator.cc

@@ -91,6 +91,9 @@ DEFINE_CVar(launch_data, "",
             "Used internally for title-to-title launches.",
             "General", true, std::string);
 
+DEFINE_bool(dump_xex, false, "Dump the main XEX to current directory on launch",
+            "General");
+
 DEFINE_bool(allow_game_relative_writes, false,
             "Not useful to non-developers. Allows code to write to paths "
             "relative to game://. Used for "

src/xenia/kernel/user_module.cc

@@ -10,11 +10,14 @@
 #include "xenia/kernel/user_module.h"
 
 #include "xenia/base/byte_stream.h"
+#include "xenia/base/filesystem.h"
 #include "xenia/base/logging.h"
 #include "xenia/base/xxhash.h"
 #include "xenia/cpu/elf_module.h"
 #include "xenia/emulator.h"
 
+DECLARE_bool(dump_xex);
+
 namespace xe {
 namespace kernel {
 
@@ -156,6 +159,16 @@ X_STATUS UserModule::LoadFromMemory(const void* addr, const size_t length) {
     // Runtime takes ownership.
     auto xex_module =
         std::make_unique<cpu::XexModule>(processor, kernel_state());
+    if (cvars::dump_xex) {
+      auto dump_name = name_ + ".xex";
+      auto dump_file = xe::filesystem::OpenFile(dump_name, "wb");
+      if (dump_file) {
+        fwrite(addr, 1, length, dump_file);
+        fclose(dump_file);
+        XELOGI("Dumped XEX '{}' ({} bytes)", dump_name, length);
+      }
+    }
+
     if (!xex_module->Load(name_, path_, addr, length)) {
       return X_STATUS_UNSUCCESSFUL;
     }