Core: pause on panic handler option

Source/Core/Core/Config/MainSettings.cpp

@@ -168,6 +168,7 @@ const Info<bool> MAIN_WIIMOTE_ENABLE_SPEAKER{{System::Main, "Core", "WiimoteEnab
 const Info<bool> MAIN_CONNECT_WIIMOTES_FOR_CONTROLLER_INTERFACE{
     {System::Main, "Core", "WiimoteControllerInterface"}, false};
 const Info<bool> MAIN_MMU{{System::Main, "Core", "MMU"}, false};
+const Info<bool> MAIN_PAUSE_ON_PANIC{{System::Main, "Core", "PauseOnPanic"}, false};
 const Info<int> MAIN_BB_DUMP_PORT{{System::Main, "Core", "BBDumpPort"}, -1};
 const Info<bool> MAIN_SYNC_GPU{{System::Main, "Core", "SyncGPU"}, false};
 const Info<int> MAIN_SYNC_GPU_MAX_DISTANCE{{System::Main, "Core", "SyncGpuMaxDistance"}, 200000};

Source/Core/Core/Config/MainSettings.h

@@ -98,6 +98,7 @@ extern const Info<bool> MAIN_WIIMOTE_CONTINUOUS_SCANNING;
 extern const Info<bool> MAIN_WIIMOTE_ENABLE_SPEAKER;
 extern const Info<bool> MAIN_CONNECT_WIIMOTES_FOR_CONTROLLER_INTERFACE;
 extern const Info<bool> MAIN_MMU;
+extern const Info<bool> MAIN_PAUSE_ON_PANIC;
 extern const Info<int> MAIN_BB_DUMP_PORT;
 extern const Info<bool> MAIN_SYNC_GPU;
 extern const Info<int> MAIN_SYNC_GPU_MAX_DISTANCE;

Source/Core/Core/ConfigLoaders/IsSettingSaveable.cpp

@@ -124,6 +124,7 @@ bool IsSettingSaveable(const Config::Location& config_location)
       &Config::GetInfoForSIDevice(3).GetLocation(),
       &Config::MAIN_CPU_THREAD.GetLocation(),
       &Config::MAIN_MMU.GetLocation(),
+      &Config::MAIN_PAUSE_ON_PANIC.GetLocation(),
       &Config::MAIN_BB_DUMP_PORT.GetLocation(),
       &Config::MAIN_SYNC_GPU.GetLocation(),
       &Config::MAIN_SYNC_GPU_MAX_DISTANCE.GetLocation(),

Source/Core/Core/PowerPC/Interpreter/Interpreter.cpp

@@ -24,6 +24,7 @@
 #include "Core/PowerPC/MMU.h"
 #include "Core/PowerPC/PPCTables.h"
 #include "Core/PowerPC/PowerPC.h"
+#include "Core/System.h"
 
 namespace
 {
@@ -341,6 +342,8 @@ void Interpreter::unknown_instruction(UGeckoInstruction inst)
   ASSERT_MSG(POWERPC, 0,
              "\nIntCPU: Unknown instruction {:08x} at PC = {:08x}  last_PC = {:08x}  LR = {:08x}\n",
              inst.hex, PC, last_pc, LR);
+  if (Core::System::GetInstance().IsPauseOnPanicMode())
+    CPU::Break();
 }
 
 void Interpreter::ClearCache()

Source/Core/Core/PowerPC/JitCommon/JitBase.cpp

@@ -57,6 +57,8 @@ void JitBase::RefreshConfig()
   m_accurate_nans = Config::Get(Config::MAIN_ACCURATE_NANS);
   m_fastmem_enabled = Config::Get(Config::MAIN_FASTMEM);
   m_mmu_enabled = Core::System::GetInstance().IsMMUMode();
+  m_pause_on_panic_enabled = Core::System::GetInstance().IsPauseOnPanicMode();
+
   analyzer.SetDebuggingEnabled(m_enable_debugging);
   analyzer.SetBranchFollowingEnabled(Config::Get(Config::MAIN_JIT_FOLLOW_BRANCH));
   analyzer.SetFloatExceptionsEnabled(m_enable_float_exceptions);
@@ -82,7 +84,7 @@ void JitBase::UpdateMemoryAndExceptionOptions()
 {
   bool any_watchpoints = PowerPC::memchecks.HasAny();
   jo.fastmem = m_fastmem_enabled && jo.fastmem_arena && (MSR.DR || !any_watchpoints);
-  jo.memcheck = m_mmu_enabled || any_watchpoints;
+  jo.memcheck = m_mmu_enabled || m_pause_on_panic_enabled || any_watchpoints;
   jo.fp_exceptions = m_enable_float_exceptions;
   jo.div_by_zero_exceptions = m_enable_div_by_zero_exceptions;
 }

Source/Core/Core/PowerPC/JitCommon/JitBase.h

@@ -134,6 +134,7 @@ protected:
   bool m_accurate_nans = false;
   bool m_fastmem_enabled = false;
   bool m_mmu_enabled = false;
+  bool m_pause_on_panic_enabled = false;
 
   void RefreshConfig();
 

Source/Core/Core/PowerPC/MMU.cpp

@@ -244,6 +244,11 @@ static T ReadFromHardware(u32 em_address)
   }
 
   PanicAlertFmt("Unable to resolve read address {:x} PC {:x}", em_address, PC);
+  if (Core::System::GetInstance().IsPauseOnPanicMode())
+  {
+    CPU::Break();
+    ppcState.Exceptions |= EXCEPTION_DSI | EXCEPTION_FAKE_MEMCHECK_HIT;
+  }
   return 0;
 }
 
@@ -406,6 +411,11 @@ static void WriteToHardware(u32 em_address, const u32 data, const u32 size)
   }
 
   PanicAlertFmt("Unable to resolve write address {:x} PC {:x}", em_address, PC);
+  if (Core::System::GetInstance().IsPauseOnPanicMode())
+  {
+    CPU::Break();
+    ppcState.Exceptions |= EXCEPTION_DSI | EXCEPTION_FAKE_MEMCHECK_HIT;
+  }
 }
 // =====================
 
@@ -1148,6 +1158,11 @@ static void GenerateDSIException(u32 effective_address, bool write)
   {
     PanicAlertFmt("Invalid {} {:#010x}, PC = {:#010x}", write ? "write to" : "read from",
                   effective_address, PC);
+    if (Core::System::GetInstance().IsPauseOnPanicMode())
+    {
+      CPU::Break();
+      ppcState.Exceptions |= EXCEPTION_DSI | EXCEPTION_FAKE_MEMCHECK_HIT;
+    }
     return;
   }
 

Source/Core/Core/System.cpp

@@ -27,6 +27,7 @@ void System::Initialize()
 {
   m_separate_cpu_and_gpu_threads = Config::Get(Config::MAIN_CPU_THREAD);
   m_mmu_enabled = Config::Get(Config::MAIN_MMU);
+  m_pause_on_panic_enabled = Config::Get(Config::MAIN_PAUSE_ON_PANIC);
 }
 
 SoundStream* System::GetSoundStream() const

Source/Core/Core/System.h

@@ -32,6 +32,7 @@ public:
 
   bool IsDualCoreMode() const { return m_separate_cpu_and_gpu_threads; }
   bool IsMMUMode() const { return m_mmu_enabled; }
+  bool IsPauseOnPanicMode() const { return m_pause_on_panic_enabled; }
 
   SoundStream* GetSoundStream() const;
   void SetSoundStream(std::unique_ptr<SoundStream> sound_stream);
@@ -48,5 +49,6 @@ private:
 
   bool m_separate_cpu_and_gpu_threads = false;
   bool m_mmu_enabled = false;
+  bool m_pause_on_panic_enabled = false;
 };
 }  // namespace Core

Source/Core/DolphinQt/Settings/AdvancedPane.cpp

@@ -68,6 +68,12 @@ void AdvancedPane::CreateLayout()
       "Enables the Memory Management Unit, needed for some games. (ON = Compatible, OFF = Fast)"));
   cpu_options_group_layout->addWidget(m_enable_mmu_checkbox);
 
+  m_pause_on_panic_checkbox = new QCheckBox(tr("Pause on Panic"));
+  m_pause_on_panic_checkbox->setToolTip(
+      tr("Pauses the emulation if a Read/Write or Unknown Instruction panic occurs.\nEnabling will "
+         "affect performance.\nThe performance impact is the same as having Enable MMU on."));
+  cpu_options_group_layout->addWidget(m_pause_on_panic_checkbox);
+
   auto* clock_override = new QGroupBox(tr("Clock Override"));
   auto* clock_override_layout = new QVBoxLayout();
   clock_override->setLayout(clock_override_layout);
@@ -180,6 +186,9 @@ void AdvancedPane::ConnectLayout()
   connect(m_enable_mmu_checkbox, &QCheckBox::toggled, this,
           [](bool checked) { Config::SetBaseOrCurrent(Config::MAIN_MMU, checked); });
 
+  connect(m_pause_on_panic_checkbox, &QCheckBox::toggled, this,
+          [](bool checked) { Config::SetBaseOrCurrent(Config::MAIN_PAUSE_ON_PANIC, checked); });
+
   m_cpu_clock_override_checkbox->setChecked(Config::Get(Config::MAIN_OVERCLOCK_ENABLE));
   connect(m_cpu_clock_override_checkbox, &QCheckBox::toggled, [this](bool enable_clock_override) {
     Config::SetBaseOrCurrent(Config::MAIN_OVERCLOCK_ENABLE, enable_clock_override);
@@ -246,6 +255,9 @@ void AdvancedPane::Update()
   m_enable_mmu_checkbox->setChecked(Config::Get(Config::MAIN_MMU));
   m_enable_mmu_checkbox->setEnabled(!running);
 
+  m_pause_on_panic_checkbox->setChecked(Config::Get(Config::MAIN_PAUSE_ON_PANIC));
+  m_pause_on_panic_checkbox->setEnabled(!running);
+
   QFont bf = font();
   bf.setBold(Config::GetActiveLayerForConfig(Config::MAIN_OVERCLOCK_ENABLE) !=
              Config::LayerType::Base);

Source/Core/DolphinQt/Settings/AdvancedPane.h

@@ -32,6 +32,7 @@ private:
 
   QComboBox* m_cpu_emulation_engine_combobox;
   QCheckBox* m_enable_mmu_checkbox;
+  QCheckBox* m_pause_on_panic_checkbox;
   QCheckBox* m_cpu_clock_override_checkbox;
   QSlider* m_cpu_clock_override_slider;
   QLabel* m_cpu_clock_override_slider_label;