Add option to dump the contents of RAM to a file

src/core/system.cpp

@@ -1228,6 +1228,15 @@ void UpdateMemoryCards()
   }
 }
 
+bool DumpRAM(const char* filename)
+{
+  auto fp = FileSystem::OpenManagedCFile(filename, "wb");
+  if (!fp)
+    return false;
+
+  return std::fwrite(Bus::g_ram, Bus::RAM_SIZE, 1, fp.get()) == 1;
+}
+
 bool HasMedia()
 {
   return g_cdrom.HasMedia();
@@ -1333,7 +1342,8 @@ bool RemoveMediaPathFromPlaylist(u32 index)
 
   if (GetMediaPlaylistIndex() == index)
   {
-    g_host_interface->AddFormattedOSDMessage(10.0f, "Removing current media from playlist, removing media from CD-ROM.");
+    g_host_interface->AddFormattedOSDMessage(10.0f,
+                                             "Removing current media from playlist, removing media from CD-ROM.");
     g_cdrom.RemoveMedia();
   }
 

src/core/system.h

@@ -104,6 +104,9 @@ void UpdateControllerSettings();
 void ResetControllers();
 void UpdateMemoryCards();
 
+/// Dumps RAM to a file.
+bool DumpRAM(const char* filename);
+
 bool HasMedia();
 bool InsertMedia(const char* path);
 void RemoveMedia();

src/duckstation-qt/mainwindow.cpp

@@ -662,6 +662,13 @@ void MainWindow::connectSignals()
     else
       m_host_interface->stopDumpingAudio();
   });
+  connect(m_ui.actionDumpRAM, &QAction::triggered, [this]() {
+    const QString filename = QFileDialog::getSaveFileName(this, tr("Destination File"));
+    if (filename.isEmpty())
+      return;
+
+    m_host_interface->dumpRAM(filename);
+  });
   SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.actionDebugShowVRAM, "Debug", "ShowVRAM");
   SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.actionDebugShowGPUState, "Debug", "ShowGPUState");
   SettingWidgetBinder::BindWidgetToBoolSetting(m_host_interface, m_ui.actionDebugShowCDROMState, "Debug",

src/duckstation-qt/mainwindow.ui

@@ -149,9 +149,10 @@
     <addaction name="menuCPUExecutionMode"/>
     <addaction name="menuRenderer"/>
     <addaction name="separator"/>
-    <addaction name="actionDumpAudio"/>
     <addaction name="actionDebugDumpCPUtoVRAMCopies"/>
     <addaction name="actionDebugDumpVRAMtoCPUCopies"/>
+    <addaction name="actionDumpAudio"/>
+    <addaction name="actionDumpRAM"/>
     <addaction name="separator"/>
     <addaction name="actionDebugShowVRAM"/>
     <addaction name="actionDebugShowGPUState"/>
@@ -484,6 +485,11 @@
     <string>Dump Audio</string>
    </property>
   </action>
+  <action name="actionDumpRAM">
+   <property name="text">
+    <string>Dump RAM...</string>
+   </property>
+  </action>
   <action name="actionDebugShowGPUState">
    <property name="checkable">
     <bool>true</bool>

src/duckstation-qt/qthostinterface.cpp

@@ -1026,6 +1026,24 @@ void QtHostInterface::stopDumpingAudio()
   StopDumpingAudio();
 }
 
+void QtHostInterface::dumpRAM(const QString& filename)
+{
+  if (!isOnWorkerThread())
+  {
+    QMetaObject::invokeMethod(this, "dumpRAM", Q_ARG(const QString&, filename));
+    return;
+  }
+
+  if (System::IsShutdown())
+    return;
+
+  const std::string filename_str = filename.toStdString();
+  if (System::DumpRAM(filename_str.c_str()))
+    ReportFormattedMessage("RAM dumped to '%s'", filename_str.c_str());
+  else
+    ReportFormattedMessage("Failed to dump RAM to '%s'", filename_str.c_str());
+}
+
 void QtHostInterface::saveScreenshot()
 {
   if (!isOnWorkerThread())

src/duckstation-qt/qthostinterface.h

@@ -151,6 +151,7 @@ public Q_SLOTS:
   void setAudioOutputMuted(bool muted);
   void startDumpingAudio();
   void stopDumpingAudio();
+  void dumpRAM(const QString& filename);
   void saveScreenshot();
   void redrawDisplayWindow();
   void toggleFullscreen();

src/duckstation-sdl/sdl_host_interface.cpp

@@ -904,6 +904,7 @@ void SDLHostInterface::DrawQuickSettingsMenu()
 
 void SDLHostInterface::DrawDebugMenu()
 {
+  const bool system_valid = System::IsValid();
   Settings::DebugSettings& debug_settings = g_settings.debugging;
   bool settings_changed = false;
 
@@ -931,6 +932,9 @@ void SDLHostInterface::DrawDebugMenu()
   settings_changed |= ImGui::MenuItem("Dump CPU to VRAM Copies", nullptr, &debug_settings.dump_cpu_to_vram_copies);
   settings_changed |= ImGui::MenuItem("Dump VRAM to CPU Copies", nullptr, &debug_settings.dump_vram_to_cpu_copies);
 
+  if (ImGui::MenuItem("Dump RAM...", nullptr, nullptr, system_valid))
+    DoDumpRAM();
+
   ImGui::Separator();
 
   settings_changed |= ImGui::MenuItem("Show VRAM", nullptr, &debug_settings.show_vram);
@@ -1511,6 +1515,22 @@ void SDLHostInterface::DoChangeDisc()
   System::ResetPerformanceCounters();
 }
 
+void SDLHostInterface::DoDumpRAM()
+{
+  Assert(!System::IsShutdown());
+
+  nfdchar_t* path = nullptr;
+  if (!NFD_SaveDialog("bin", nullptr, &path) || !path || std::strlen(path) == 0)
+    return;
+
+  if (System::DumpRAM(path))
+    AddFormattedOSDMessage(5.0f, "Dumped RAM to '%s'", path);
+  else
+    AddFormattedOSDMessage(10.0f, "Failed to dump RAM to '%s'", path);
+
+  System::ResetPerformanceCounters();
+}
+
 void SDLHostInterface::Run()
 {
   while (!m_quit_request)

src/duckstation-sdl/sdl_host_interface.h

@@ -79,6 +79,7 @@ private:
   void DrawImGuiWindows() override;
   void DoStartDisc();
   void DoChangeDisc();
+  void DoDumpRAM();
 
   void HandleSDLEvent(const SDL_Event* event);
   void ProcessEvents();