video_core: Merge tex0 and tex_cube

externals/CMakeLists.txt

@@ -41,15 +41,9 @@ else()
 endif()
 
 # Catch2
-add_library(catch2 INTERFACE)
+set(CATCH_INSTALL_DOCS OFF CACHE BOOL "")
-if(USE_SYSTEM_CATCH2)
+set(CATCH_INSTALL_EXTRAS OFF CACHE BOOL "")
-    find_package(Catch2 3.0.0 REQUIRED)
+add_subdirectory(catch2)
-else()
-    set(CATCH_INSTALL_DOCS OFF CACHE BOOL "")
-    set(CATCH_INSTALL_EXTRAS OFF CACHE BOOL "")
-    add_subdirectory(catch2)
-endif()
-target_link_libraries(catch2 INTERFACE Catch2::Catch2WithMain)
 
 # Crypto++
 if(USE_SYSTEM_CRYPTOPP)

externals/cmake-modules/CitraHandleSystemLibs.cmake

@@ -25,7 +25,6 @@ option(USE_SYSTEM_LODEPNG "Use the system lodepng (instead of the bundled one)"
 option(USE_SYSTEM_OPENAL "Use the system OpenAL (instead of the bundled one)" OFF)
 option(USE_SYSTEM_VMA "Use the system VulkanMemoryAllocator (instead of the bundled one)" OFF)
 option(USE_SYSTEM_VULKAN_HEADERS "Use the system Vulkan headers (instead of the bundled ones)" OFF)
-option(USE_SYSTEM_CATCH2 "Use the system Catch2 (instead of the bundled one)" OFF)
 
 # Qt and MoltenVK are handled separately
 CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_SDL2 "Disable system SDL2" OFF "USE_SYSTEM_LIBS" OFF)
@@ -50,7 +49,6 @@ CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_LODEPNG "Disable system lodepng" OFF "USE_
 CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_OPENAL "Disable system OpenAL" OFF "USE_SYSTEM_LIBS" OFF)
 CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_VMA "Disable system VulkanMemoryAllocator" OFF "USE_SYSTEM_LIBS" OFF)
 CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_VULKAN_HEADERS "Disable system Vulkan headers" OFF "USE_SYSTEM_LIBS" OFF)
-CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_CATCH2 "Disable system Catch2" OFF "USE_SYSTEM_LIBS" OFF)
 
 set(LIB_VAR_LIST
     SDL2
@@ -75,7 +73,6 @@ set(LIB_VAR_LIST
     OPENAL
     VMA
     VULKAN_HEADERS
-    CATCH2
     )
 
 # First, check that USE_SYSTEM_XXX is not used with USE_SYSTEM_LIBS

externals/cmake-modules/FindOpenAL.cmake

@@ -1,5 +1,5 @@
 if(NOT OPENAL_FOUND)
-    pkg_check_modules(OPENAL_TMP openal)
+    pkg_check_modules(OOPENAL_TMP libopanal)
 
     find_path(OPENAL_INCLUDE_DIRS NAMES al.h
             PATHS

src/citra_qt/configuration/config.cpp

@@ -76,13 +76,13 @@ const std::array<UISettings::Shortcut, 28> Config::default_hotkeys {{
      {QStringLiteral("Stop Emulation"),           QStringLiteral("Main Window"), {QStringLiteral("F5"),     Qt::WindowShortcut}},
      {QStringLiteral("Swap Screens"),             QStringLiteral("Main Window"), {QStringLiteral("F9"),     Qt::WindowShortcut}},
      {QStringLiteral("Toggle 3D"),                QStringLiteral("Main Window"), {QStringLiteral("Ctrl+3"), Qt::ApplicationShortcut}},
-     {QStringLiteral("Toggle Custom Textures"),   QStringLiteral("Main Window"), {QStringLiteral("F7"),     Qt::ApplicationShortcut}},
+     {QStringLiteral("Toggle Per-Game Speed"),    QStringLiteral("Main Window"), {QStringLiteral("Ctrl+Z"), Qt::ApplicationShortcut}},
      {QStringLiteral("Toggle Filter Bar"),        QStringLiteral("Main Window"), {QStringLiteral("Ctrl+F"), Qt::WindowShortcut}},
      {QStringLiteral("Toggle Frame Advancing"),   QStringLiteral("Main Window"), {QStringLiteral("Ctrl+A"), Qt::ApplicationShortcut}},
-     {QStringLiteral("Toggle Per-Game Speed"),    QStringLiteral("Main Window"), {QStringLiteral("Ctrl+Z"), Qt::ApplicationShortcut}},
      {QStringLiteral("Toggle Screen Layout"),     QStringLiteral("Main Window"), {QStringLiteral("F10"),    Qt::WindowShortcut}},
      {QStringLiteral("Toggle Status Bar"),        QStringLiteral("Main Window"), {QStringLiteral("Ctrl+S"), Qt::WindowShortcut}},
      {QStringLiteral("Toggle Texture Dumping"),   QStringLiteral("Main Window"), {QStringLiteral(""),       Qt::ApplicationShortcut}},
+     {QStringLiteral("Toggle Custom Textures"),   QStringLiteral("Main Window"), {QStringLiteral("F7"),     Qt::ApplicationShortcut}},
     }};
 // clang-format on
 

src/common/file_util.cpp

@@ -24,7 +24,6 @@
 // windows.h needs to be included before other windows headers
 #include <direct.h> // getcwd
 #include <io.h>
-#include <share.h>
 #include <shellapi.h>
 #include <shlobj.h> // for SHGetFolderPath
 #include <tchar.h>
@@ -1059,13 +1058,14 @@ bool IOFile::Open() {
     Close();
 
 #ifdef _WIN32
-    if (flags == 0) {
+    if (flags != 0) {
-        flags = _SH_DENYNO;
-    }
         m_file = _wfsopen(Common::UTF8ToUTF16W(filename).c_str(),
                           Common::UTF8ToUTF16W(openmode).c_str(), flags);
         m_good = m_file != nullptr;
-
+    } else {
+        m_good = _wfopen_s(&m_file, Common::UTF8ToUTF16W(filename).c_str(),
+                           Common::UTF8ToUTF16W(openmode).c_str()) == 0;
+    }
 #elif ANDROID
     // Check whether filepath is startsWith content
     AndroidStorage::AndroidOpenMode android_open_mode = AndroidStorage::ParseOpenmode(openmode);

src/core/CMakeLists.txt

@@ -455,6 +455,7 @@ add_library(citra_core STATIC
     loader/smdh.h
     memory.cpp
     memory.h
+    mmio.h
     movie.cpp
     movie.h
     nus_download.cpp

src/core/file_sys/ticket.h

@@ -50,9 +50,6 @@ public:
 
     Loader::ResultStatus Load(std::span<const u8> file_data, std::size_t offset = 0);
     std::optional<std::array<u8, 16>> GetTitleKey() const;
-    u64 GetTitleID() const {
-        return ticket_body.title_id;
-    }
 
 private:
     Body ticket_body;

src/core/hle/kernel/vm_manager.cpp

@@ -10,6 +10,7 @@
 #include "core/hle/kernel/vm_manager.h"
 #include "core/hle/service/plgldr/plgldr.h"
 #include "core/memory.h"
+#include "core/mmio.h"
 
 namespace Kernel {
 
@@ -32,6 +33,9 @@ bool VirtualMemoryArea::CanBeMergedWith(const VirtualMemoryArea& next) const {
         backing_memory.GetPtr() + size != next.backing_memory.GetPtr()) {
         return false;
     }
+    if (type == VMAType::MMIO && paddr + size != next.paddr) {
+        return false;
+    }
     return true;
 }
 
@@ -114,6 +118,26 @@ ResultVal<VMManager::VMAHandle> VMManager::MapBackingMemory(VAddr target, Memory
     return MergeAdjacent(vma_handle);
 }
 
+ResultVal<VMManager::VMAHandle> VMManager::MapMMIO(VAddr target, PAddr paddr, u32 size,
+                                                   MemoryState state,
+                                                   Memory::MMIORegionPointer mmio_handler) {
+    ASSERT(!is_locked);
+
+    // This is the appropriately sized VMA that will turn into our allocation.
+    CASCADE_RESULT(VMAIter vma_handle, CarveVMA(target, size));
+    VirtualMemoryArea& final_vma = vma_handle->second;
+    ASSERT(final_vma.size == size);
+
+    final_vma.type = VMAType::MMIO;
+    final_vma.permissions = VMAPermission::ReadWrite;
+    final_vma.meminfo_state = state;
+    final_vma.paddr = paddr;
+    final_vma.mmio_handler = mmio_handler;
+    UpdatePageTableForVMA(final_vma);
+
+    return MergeAdjacent(vma_handle);
+}
+
 ResultCode VMManager::ChangeMemoryState(VAddr target, u32 size, MemoryState expected_state,
                                         VMAPermission expected_perms, MemoryState new_state,
                                         VMAPermission new_perms) {
@@ -161,7 +185,9 @@ VMManager::VMAIter VMManager::Unmap(VMAIter vma_handle) {
     vma.type = VMAType::Free;
     vma.permissions = VMAPermission::None;
     vma.meminfo_state = MemoryState::Free;
+
     vma.backing_memory = nullptr;
+    vma.paddr = 0;
 
     UpdatePageTableForVMA(vma);
 
@@ -318,6 +344,9 @@ VMManager::VMAIter VMManager::SplitVMA(VMAIter vma_handle, u32 offset_in_vma) {
     case VMAType::BackingMemory:
         new_vma.backing_memory += offset_in_vma;
         break;
+    case VMAType::MMIO:
+        new_vma.paddr += offset_in_vma;
+        break;
     }
 
     ASSERT(old_vma.CanBeMergedWith(new_vma));
@@ -352,6 +381,9 @@ void VMManager::UpdatePageTableForVMA(const VirtualMemoryArea& vma) {
     case VMAType::BackingMemory:
         memory.MapMemoryRegion(*page_table, vma.base, vma.size, vma.backing_memory);
         break;
+    case VMAType::MMIO:
+        memory.MapIoRegion(*page_table, vma.base, vma.size, vma.mmio_handler);
+        break;
     }
 
     auto plgldr = Service::PLGLDR::GetService(Core::System::GetInstance());

src/core/hle/kernel/vm_manager.h

@@ -6,6 +6,8 @@
 
 #include <map>
 #include <memory>
+#include <utility>
+#include <vector>
 #include <boost/serialization/map.hpp>
 #include <boost/serialization/shared_ptr.hpp>
 #include <boost/serialization/split_member.hpp>
@@ -14,6 +16,7 @@
 #include "core/hle/kernel/memory.h"
 #include "core/hle/result.h"
 #include "core/memory.h"
+#include "core/mmio.h"
 
 namespace Kernel {
 
@@ -22,6 +25,8 @@ enum class VMAType : u8 {
     Free,
     /// VMA is backed by a raw, unmanaged pointer.
     BackingMemory,
+    /// VMA is mapped to MMIO registers at a fixed PAddr.
+    MMIO,
 };
 
 /// Permissions for mapped memory blocks
@@ -69,10 +74,15 @@ struct VirtualMemoryArea {
     /// Tag returned by svcQueryMemory. Not otherwise used.
     MemoryState meminfo_state = MemoryState::Free;
 
-    /// Settings for type = BackingMemory
+    // Settings for type = BackingMemory
     /// Pointer backing this VMA. It will not be destroyed or freed when the VMA is removed.
     MemoryRef backing_memory{};
 
+    // Settings for type = MMIO
+    /// Physical address of the register area this VMA maps to.
+    PAddr paddr = 0;
+    Memory::MMIORegionPointer mmio_handler = nullptr;
+
     /// Tests if this area can be merged to the right with `next`.
     bool CanBeMergedWith(const VirtualMemoryArea& next) const;
 
@@ -86,6 +96,8 @@ private:
         ar& permissions;
         ar& meminfo_state;
         ar& backing_memory;
+        ar& paddr;
+        ar& mmio_handler;
     }
 };
 
@@ -154,6 +166,18 @@ public:
     ResultVal<VMAHandle> MapBackingMemory(VAddr target, MemoryRef memory, u32 size,
                                           MemoryState state);
 
+    /**
+     * Maps a memory-mapped IO region at a given address.
+     *
+     * @param target The guest address to start the mapping at.
+     * @param paddr The physical address where the registers are present.
+     * @param size Size of the mapping.
+     * @param state MemoryState tag to attach to the VMA.
+     * @param mmio_handler The handler that will implement read and write for this MMIO region.
+     */
+    ResultVal<VMAHandle> MapMMIO(VAddr target, PAddr paddr, u32 size, MemoryState state,
+                                 Memory::MMIORegionPointer mmio_handler);
+
     /**
      * Updates the memory state and permissions of the specified range. The range's original memory
      * state and permissions must match the `expected` parameters.

src/core/hle/service/am/am.cpp

@@ -374,45 +374,6 @@ bool CIAFile::Close() const {
 
 void CIAFile::Flush() const {}
 
-TicketFile::TicketFile() {}
-
-TicketFile::~TicketFile() {
-    Close();
-}
-
-ResultVal<std::size_t> TicketFile::Read(u64 offset, std::size_t length, u8* buffer) const {
-    UNIMPLEMENTED();
-    return length;
-}
-
-ResultVal<std::size_t> TicketFile::Write(u64 offset, std::size_t length, bool flush,
-                                         const u8* buffer) {
-    written += length;
-    data.resize(written);
-    std::memcpy(data.data() + offset, buffer, length);
-    return length;
-}
-
-u64 TicketFile::GetSize() const {
-    return written;
-}
-
-bool TicketFile::SetSize(u64 size) const {
-    return false;
-}
-
-bool TicketFile::Close() const {
-    FileSys::Ticket ticket;
-    if (ticket.Load(data, 0) == Loader::ResultStatus::Success) {
-        LOG_WARNING(Service_AM, "Discarding ticket for {:#016X}.", ticket.GetTitleID());
-    } else {
-        LOG_ERROR(Service_AM, "Invalid ticket provided to TicketFile.");
-    }
-    return true;
-}
-
-void TicketFile::Flush() const {}
-
 InstallStatus InstallCIA(const std::string& path,
                          std::function<ProgressCallback>&& update_callback) {
     LOG_INFO(Service_AM, "Installing {}...", path);
@@ -981,10 +942,6 @@ void Module::Interface::GetProgramInfos(Kernel::HLERequestContext& ctx) {
     rb.PushMappedBuffer(title_info_out);
 }
 
-void Module::Interface::GetProgramInfosIgnorePlatform(Kernel::HLERequestContext& ctx) {
-    GetProgramInfos(ctx);
-}
-
 void Module::Interface::DeleteUserProgram(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp(ctx);
     auto media_type = rp.PopEnum<FS::MediaType>();
@@ -1220,16 +1177,6 @@ void Module::Interface::NeedsCleanup(Kernel::HLERequestContext& ctx) {
     rb.Push<bool>(false);
 }
 
-void Module::Interface::DoCleanup(Kernel::HLERequestContext& ctx) {
-    IPC::RequestParser rp(ctx);
-    const auto media_type = rp.Pop<u8>();
-
-    LOG_DEBUG(Service_AM, "(STUBBED) called, media_type={:#02x}", media_type);
-
-    IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
-    rb.Push(RESULT_SUCCESS);
-}
-
 void Module::Interface::QueryAvailableTitleDatabase(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp(ctx);
     u8 media_type = rp.Pop<u8>();
@@ -1241,45 +1188,6 @@ void Module::Interface::QueryAvailableTitleDatabase(Kernel::HLERequestContext& c
     LOG_WARNING(Service_AM, "(STUBBED) media_type={}", media_type);
 }
 
-void Module::Interface::GetPersonalizedTicketInfoList(Kernel::HLERequestContext& ctx) {
-    IPC::RequestParser rp(ctx);
-    [[maybe_unused]] u32 ticket_count = rp.Pop<u32>();
-    [[maybe_unused]] auto& buffer = rp.PopMappedBuffer();
-
-    IPC::RequestBuilder rb = rp.MakeBuilder(2, 0);
-    rb.Push(RESULT_SUCCESS); // No error
-    rb.Push(0);
-
-    LOG_WARNING(Service_AM, "(STUBBED) called, ticket_count={}", ticket_count);
-}
-
-void Module::Interface::GetNumImportTitleContextsFiltered(Kernel::HLERequestContext& ctx) {
-    IPC::RequestParser rp(ctx);
-    u8 media_type = rp.Pop<u8>();
-    u8 filter = rp.Pop<u8>();
-
-    IPC::RequestBuilder rb = rp.MakeBuilder(2, 0);
-    rb.Push(RESULT_SUCCESS); // No error
-    rb.Push(0);
-
-    LOG_WARNING(Service_AM, "(STUBBED) called, media_type={}, filter={}", media_type, filter);
-}
-
-void Module::Interface::GetImportTitleContextListFiltered(Kernel::HLERequestContext& ctx) {
-    IPC::RequestParser rp(ctx);
-    [[maybe_unused]] const u32 count = rp.Pop<u32>();
-    const u8 media_type = rp.Pop<u8>();
-    const u8 filter = rp.Pop<u8>();
-    auto& buffer = rp.PopMappedBuffer();
-
-    IPC::RequestBuilder rb = rp.MakeBuilder(2, 2);
-    rb.Push(RESULT_SUCCESS); // No error
-    rb.Push(0);
-    rb.PushMappedBuffer(buffer);
-
-    LOG_WARNING(Service_AM, "(STUBBED) called, media_type={}, filter={}", media_type, filter);
-}
-
 void Module::Interface::CheckContentRights(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp(ctx);
     u64 tid = rp.Pop<u64>();
@@ -1766,30 +1674,6 @@ void Module::Interface::GetMetaDataFromCia(Kernel::HLERequestContext& ctx) {
     rb.PushMappedBuffer(output_buffer);
 }
 
-void Module::Interface::BeginImportTicket(Kernel::HLERequestContext& ctx) {
-    IPC::RequestParser rp(ctx);
-
-    // Create our TicketFile handle for the app to write to
-    auto file = std::make_shared<Service::FS::File>(am->kernel, std::make_unique<TicketFile>(),
-                                                    FileSys::Path{});
-
-    IPC::RequestBuilder rb = rp.MakeBuilder(1, 2);
-    rb.Push(RESULT_SUCCESS); // No error
-    rb.PushCopyObjects(file->Connect());
-
-    LOG_WARNING(Service_AM, "(STUBBED) called");
-}
-
-void Module::Interface::EndImportTicket(Kernel::HLERequestContext& ctx) {
-    IPC::RequestParser rp(ctx);
-    [[maybe_unused]] const auto ticket = rp.PopObject<Kernel::ClientSession>();
-
-    IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
-    rb.Push(RESULT_SUCCESS);
-
-    LOG_WARNING(Service_AM, "(STUBBED) called");
-}
-
 Module::Module(Core::System& system) : kernel(system.Kernel()) {
     ScanForAllTitles();
     system_updater_mutex = system.Kernel().CreateMutex(false, "AM::SystemUpdaterMutex");

src/core/hle/service/am/am.h

@@ -109,25 +109,6 @@ private:
     std::unique_ptr<DecryptionState> decryption_state;
 };
 
-// A file handled returned for Tickets to be written into and subsequently installed.
-class TicketFile final : public FileSys::FileBackend {
-public:
-    explicit TicketFile();
-    ~TicketFile();
-
-    ResultVal<std::size_t> Read(u64 offset, std::size_t length, u8* buffer) const override;
-    ResultVal<std::size_t> Write(u64 offset, std::size_t length, bool flush,
-                                 const u8* buffer) override;
-    u64 GetSize() const override;
-    bool SetSize(u64 size) const override;
-    bool Close() const override;
-    void Flush() const override;
-
-private:
-    u64 written = 0;
-    std::vector<u8> data;
-};
-
 /**
  * Installs a CIA file from a specified file path.
  * @param path file path of the CIA file to install
@@ -291,18 +272,6 @@ public:
          */
         void GetProgramInfos(Kernel::HLERequestContext& ctx);
 
-        /**
-         * AM::GetProgramInfosIgnorePlatform service function
-         *  Inputs:
-         *      1 : u8 Mediatype
-         *      2 : Total titles
-         *      4 : TitleIDList pointer
-         *      6 : TitleList pointer
-         *  Outputs:
-         *      1 : Result, 0 on success, otherwise error code
-         */
-        void GetProgramInfosIgnorePlatform(Kernel::HLERequestContext& ctx);
-
         /**
          * AM::DeleteUserProgram service function
          * Deletes a user program
@@ -420,15 +389,6 @@ public:
          */
         void NeedsCleanup(Kernel::HLERequestContext& ctx);
 
-        /**
-         * AM::DoCleanup service function
-         *  Inputs:
-         *      1 : Media Type
-         *  Outputs:
-         *      1 : Result, 0 on success, otherwise error code
-         */
-        void DoCleanup(Kernel::HLERequestContext& ctx);
-
         /**
          * AM::QueryAvailableTitleDatabase service function
          *  Inputs:
@@ -439,42 +399,6 @@ public:
          */
         void QueryAvailableTitleDatabase(Kernel::HLERequestContext& ctx);
 
-        /**
-         * AM::GetPersonalizedTicketInfoList service function
-         *  Inputs:
-         *      1 : Count
-         *      2-3 : Buffer
-         *  Outputs:
-         *      1 : Result, 0 on success, otherwise error code
-         *      2 : Out count
-         */
-        void GetPersonalizedTicketInfoList(Kernel::HLERequestContext& ctx);
-
-        /**
-         * AM::GetNumImportTitleContextsFiltered service function
-         *  Inputs:
-         *      1 : Count
-         *      2 : Filter
-         *  Outputs:
-         *      1 : Result, 0 on success, otherwise error code
-         *      2 : Num import titles
-         */
-        void GetNumImportTitleContextsFiltered(Kernel::HLERequestContext& ctx);
-
-        /**
-         * AM::GetImportTitleContextListFiltered service function
-         *  Inputs:
-         *      1 : Count
-         *      2 : Media type
-         *      3 : filter
-         *      4-5 : Buffer
-         *  Outputs:
-         *      1 : Result, 0 on success, otherwise error code
-         *      2 : Out count
-         *      3-4 : Out buffer
-         */
-        void GetImportTitleContextListFiltered(Kernel::HLERequestContext& ctx);
-
         /**
          * AM::CheckContentRights service function
          *  Inputs:
@@ -678,25 +602,6 @@ public:
          */
         void GetMetaDataFromCia(Kernel::HLERequestContext& ctx);
 
-        /**
-         * AM::BeginImportTicket service function
-         *  Inputs:
-         *      1 : Media type to install title to
-         *  Outputs:
-         *      1 : Result, 0 on success, otherwise error code
-         *      2-3 : TicketHandle handle for application to write to
-         */
-        void BeginImportTicket(Kernel::HLERequestContext& ctx);
-
-        /**
-         * AM::EndImportTicket service function
-         *  Inputs:
-         *      1-2 : TicketHandle handle application wrote to
-         *  Outputs:
-         *      1 : Result, 0 on success, otherwise error code
-         */
-        void EndImportTicket(Kernel::HLERequestContext& ctx);
-
     protected:
         std::shared_ptr<Module> am;
     };

src/core/hle/service/am/am_net.cpp

@@ -42,19 +42,19 @@ AM_NET::AM_NET(std::shared_ptr<Module> am) : Module::Interface(std::move(am), "a
         {0x001E, nullptr, "ReadTwlBackupInfo"},
         {0x001F, nullptr, "DeleteAllExpiredUserPrograms"},
         {0x0020, nullptr, "GetTwlArchiveResourceInfo"},
-        {0x0021, &AM_NET::GetPersonalizedTicketInfoList, "GetPersonalizedTicketInfoList"},
+        {0x0021, nullptr, "GetPersonalizedTicketInfoList"},
         {0x0022, nullptr, "DeleteAllImportContextsFiltered"},
-        {0x0023, &AM_NET::GetNumImportTitleContextsFiltered, "GetNumImportTitleContextsFiltered"},
+        {0x0023, nullptr, "GetNumImportTitleContextsFiltered"},
-        {0x0024, &AM_NET::GetImportTitleContextListFiltered, "GetImportTitleContextListFiltered"},
+        {0x0024, nullptr, "GetImportTitleContextListFiltered"},
-        {0x0025, &AM_NET::CheckContentRights, "CheckContentRights"},
+        {0x0025, nullptr, "CheckContentRights"},
         {0x0026, nullptr, "GetTicketLimitInfos"},
         {0x0027, nullptr, "GetDemoLaunchInfos"},
         {0x0028, nullptr, "ReadTwlBackupInfoEx"},
         {0x0029, nullptr, "DeleteUserProgramsAtomically"},
         {0x002A, nullptr, "GetNumExistingContentInfosSystem"},
         {0x002B, nullptr, "ListExistingContentInfosSystem"},
-        {0x002C, &AM_NET::GetProgramInfosIgnorePlatform, "GetProgramInfosIgnorePlatform"},
+        {0x002C, nullptr, "GetProgramInfosIgnorePlatform"},
-        {0x002D, &AM_NET::CheckContentRightsIgnorePlatform, "CheckContentRightsIgnorePlatform"},
+        {0x002D, nullptr, "CheckContentRightsIgnorePlatform"},
         {0x0401, nullptr, "UpdateFirmwareTo"},
         {0x0402, &AM_NET::BeginImportProgram, "BeginImportProgram"},
         {0x0403, nullptr, "BeginImportProgramTemporarily"},
@@ -72,7 +72,7 @@ AM_NET::AM_NET(std::shared_ptr<Module> am) : Module::Interface(std::move(am), "a
         {0x040F, nullptr, "UpdateFirmwareAuto"},
         {0x0410, &AM_NET::DeleteProgram, "DeleteProgram"},
         {0x0411, nullptr, "GetTwlProgramListForReboot"},
-        {0x0412, &AM_NET::GetSystemUpdaterMutex, "GetSystemUpdaterMutex"},
+        {0x0412, nullptr, "GetSystemUpdaterMutex"},
         {0x0413, &AM_NET::GetMetaSizeFromCia, "GetMetaSizeFromCia"},
         {0x0414, &AM_NET::GetMetaDataFromCia, "GetMetaDataFromCia"},
         {0x0415, nullptr, "CheckDemoLaunchRights"},
@@ -80,9 +80,9 @@ AM_NET::AM_NET(std::shared_ptr<Module> am) : Module::Interface(std::move(am), "a
         {0x0417, nullptr, "PerpetuateAgbSaveData"},
         {0x0418, nullptr, "BeginImportProgramForOverWrite"},
         {0x0419, nullptr, "BeginImportSystemProgram"},
-        {0x0801, &AM_NET::BeginImportTicket, "BeginImportTicket"},
+        {0x0801, nullptr, "BeginImportTicket"},
         {0x0802, nullptr, "CancelImportTicket"},
-        {0x0803, &AM_NET::EndImportTicket, "EndImportTicket"},
+        {0x0803, nullptr, "EndImportTicket"},
         {0x0804, nullptr, "BeginImportTitle"},
         {0x0805, nullptr, "StopImportTitle"},
         {0x0806, nullptr, "ResumeImportTitle"},

src/core/hle/service/am/am_sys.cpp

@@ -29,7 +29,7 @@ AM_SYS::AM_SYS(std::shared_ptr<Module> am) : Module::Interface(std::move(am), "a
         {0x0011, nullptr, "GetImportContentContexts"},
         {0x0012, nullptr, "DeleteImportContentContexts"},
         {0x0013, &AM_SYS::NeedsCleanup, "NeedsCleanup"},
-        {0x0014, &AM_SYS::DoCleanup, "DoCleanup"},
+        {0x0014, nullptr, "DoCleanup"},
         {0x0015, nullptr, "DeleteAllImportContexts"},
         {0x0016, nullptr, "DeleteAllTemporaryPrograms"},
         {0x0017, nullptr, "ImportTwlBackupLegacy"},

src/core/hle/service/fs/fs_user.cpp

@@ -875,7 +875,7 @@ void FS_USER::GetThisSaveDataSecureValue(Kernel::HLERequestContext& ctx) {
     // TODO: Implement Secure Value Lookup & Generation
 
     rb.Push<bool>(false); // indicates that the secure value doesn't exist
-    rb.Push<bool>(true);  // seems to override checking the validity so should be true
+    rb.Push<bool>(false); // looks like a boolean value, purpose unknown
     rb.Push<u64>(0);      // the secure value
 }
 
@@ -913,7 +913,7 @@ void FS_USER::GetSaveDataSecureValue(Kernel::HLERequestContext& ctx) {
     // TODO: Implement Secure Value Lookup & Generation
 
     rb.Push<bool>(false); // indicates that the secure value doesn't exist
-    rb.Push<bool>(true);  // seems to override checking the validity so should be true
+    rb.Push<bool>(false); // looks like a boolean value, purpose unknown
     rb.Push<u64>(0);      // the secure value
 }
 

src/core/hle/service/mic/mic_u.cpp

@@ -298,7 +298,7 @@ struct MIC_U::Impl {
         IPC::RequestBuilder rb = rp.MakeBuilder(2, 0);
         rb.Push(RESULT_SUCCESS);
         rb.Push<u8>(state.gain);
-        LOG_TRACE(Service_MIC, "gain={}", state.gain);
+        LOG_TRACE(Service_MIC, "gain={}", gain);
     }
 
     void SetPower(Kernel::HLERequestContext& ctx) {

src/core/hle/service/ps/ps_ps.cpp

@@ -9,7 +9,6 @@
 #include "core/core.h"
 #include "core/hle/ipc_helpers.h"
 #include "core/hle/service/ps/ps_ps.h"
-#include "core/hle/service/ssl/ssl_c.h"
 #include "core/hw/aes/arithmetic128.h"
 #include "core/hw/aes/key.h"
 
@@ -147,20 +146,6 @@ void PS_PS::EncryptDecryptAes(Kernel::HLERequestContext& ctx) {
     rb.PushMappedBuffer(destination);
 }
 
-void PS_PS::GenerateRandomBytes(Kernel::HLERequestContext& ctx) {
-    IPC::RequestParser rp(ctx);
-    const u32 size = rp.Pop<u32>();
-    auto buffer = rp.PopMappedBuffer();
-
-    std::vector<u8> out_data(size);
-    SSL::GenerateRandomData(out_data);
-    buffer.Write(out_data.data(), 0, size);
-
-    IPC::RequestBuilder rb = rp.MakeBuilder(1, 2);
-    rb.Push(RESULT_SUCCESS);
-    rb.PushMappedBuffer(buffer);
-}
-
 PS_PS::PS_PS() : ServiceFramework("ps:ps", DefaultMaxSessions) {
     static const FunctionInfo functions[] = {
         // clang-format off
@@ -175,7 +160,7 @@ PS_PS::PS_PS() : ServiceFramework("ps:ps", DefaultMaxSessions) {
         {0x000A, nullptr, "GetLocalFriendCodeSeed"},
         {0x000B, nullptr, "GetDeviceId"},
         {0x000C, nullptr, "SeedRNG"},
-        {0x000D, &PS_PS::GenerateRandomBytes, "GenerateRandomBytes"},
+        {0x000D, nullptr, "GenerateRandomBytes"},
         {0x000E, nullptr, "InterfaceForPXI_0x04010084"},
         {0x000F, nullptr, "InterfaceForPXI_0x04020082"},
         {0x0010, nullptr, "InterfaceForPXI_0x04030044"},

src/core/hle/service/qtm/qtm_s.cpp

@@ -10,24 +10,12 @@ SERIALIZE_EXPORT_IMPL(Service::QTM::QTM_S)
 
 namespace Service::QTM {
 
-void QTM_S::GetHeadtrackingInfo(Kernel::HLERequestContext& ctx) {
-    IPC::RequestParser rp(ctx);
-    [[maybe_unused]] const u64 unknown = rp.Pop<u64>();
-
-    std::array<u8, 0x40> data{};
-    IPC::RequestBuilder rb = rp.MakeBuilder(17, 0);
-    rb.Push(RESULT_SUCCESS);
-    rb.PushRaw<std::array<u8, 0x40>>(data);
-
-    LOG_DEBUG(Service, "(STUBBED) called");
-}
-
 QTM_S::QTM_S() : ServiceFramework("qtm:s", 2) {
     static const FunctionInfo functions[] = {
         // qtm common commands
         // clang-format off
         {0x0001, nullptr, "GetHeadtrackingInfoRaw"},
-        {0x0002, &QTM_S::GetHeadtrackingInfo, "GetHeadtrackingInfo"},
+        {0x0002, nullptr, "GetHeadtrackingInfo"},
         // clang-format on
     };
 

src/core/hle/service/qtm/qtm_s.h

@@ -15,8 +15,6 @@ public:
 
 private:
     SERVICE_SERIALIZATION_SIMPLE
-
-    void GetHeadtrackingInfo(Kernel::HLERequestContext& ctx);
 };
 
 } // namespace Service::QTM

src/core/hle/service/ssl/ssl_c.cpp

@@ -2,7 +2,6 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
-#include <openssl/rand.h>
 #include "common/archives.h"
 #include "common/common_types.h"
 #include "core/core.h"
@@ -17,6 +16,10 @@ void SSL_C::Initialize(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp(ctx);
     rp.PopPID();
 
+    // Seed random number generator when the SSL service is initialized
+    std::random_device rand_device;
+    rand_gen.seed(rand_device());
+
     // Stub, return success
     IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
     rb.Push(RESULT_SUCCESS);
@@ -24,13 +27,33 @@ void SSL_C::Initialize(Kernel::HLERequestContext& ctx) {
 
 void SSL_C::GenerateRandomData(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp(ctx);
-    const u32 size = rp.Pop<u32>();
+    u32 size = rp.Pop<u32>();
     auto buffer = rp.PopMappedBuffer();
 
-    std::vector<u8> out_data(size);
+    // Fill the output buffer with random data.
-    SSL::GenerateRandomData(out_data);
+    u32 data = 0;
-    buffer.Write(out_data.data(), 0, size);
+    u32 i = 0;
+    while (i < size) {
+        if ((i % 4) == 0) {
+            // The random number generator returns 4 bytes worth of data, so generate new random
+            // data when i == 0 and when i is divisible by 4
+            data = rand_gen();
+        }
 
+        if (size > 4) {
+            // Use up the entire 4 bytes of the random data for as long as possible
+            buffer.Write(&data, i, 4);
+            i += 4;
+        } else if (size == 2) {
+            buffer.Write(&data, i, 2);
+            i += 2;
+        } else {
+            buffer.Write(&data, i, 1);
+            i++;
+        }
+    }
+
+    // Stub, return success
     IPC::RequestBuilder rb = rp.MakeBuilder(1, 2);
     rb.Push(RESULT_SUCCESS);
     rb.PushMappedBuffer(buffer);
@@ -73,9 +96,4 @@ void InstallInterfaces(Core::System& system) {
     std::make_shared<SSL_C>()->InstallAsService(service_manager);
 }
 
-void GenerateRandomData(std::vector<u8>& out) {
-    // Fill the output buffer with random data.
-    RAND_bytes(out.data(), static_cast<int>(out.size()));
-}
-
 } // namespace Service::SSL

src/core/hle/service/ssl/ssl_c.h

@@ -21,13 +21,14 @@ private:
     void Initialize(Kernel::HLERequestContext& ctx);
     void GenerateRandomData(Kernel::HLERequestContext& ctx);
 
+    // TODO: Implement a proper CSPRNG in the future when actual security is needed
+    std::mt19937 rand_gen;
+
     SERVICE_SERIALIZATION_SIMPLE
 };
 
 void InstallInterfaces(Core::System& system);
 
-void GenerateRandomData(std::vector<u8>& out);
-
 } // namespace Service::SSL
 
 BOOST_CLASS_EXPORT_KEY(Service::SSL::SSL_C)

src/core/memory.cpp

@@ -156,6 +156,20 @@ public:
         return system.GetRunningCore().GetPC();
     }
 
+    /**
+     * This function should only be called for virtual addreses with attribute `PageType::Special`.
+     */
+    MMIORegionPointer GetMMIOHandler(const PageTable& page_table, VAddr vaddr) {
+        for (const auto& region : page_table.special_regions) {
+            if (vaddr >= region.base && vaddr < (region.base + region.size)) {
+                return region.handler;
+            }
+        }
+
+        ASSERT_MSG(false, "Mapped IO page without a handler @ {:08X}", vaddr);
+        return nullptr; // Should never happen
+    }
+
     template <bool UNSAFE>
     void ReadBlockImpl(const Kernel::Process& process, const VAddr src_addr, void* dest_buffer,
                        const std::size_t size) {
@@ -187,6 +201,12 @@ public:
                 std::memcpy(dest_buffer, src_ptr, copy_amount);
                 break;
             }
+            case PageType::Special: {
+                MMIORegionPointer handler = GetMMIOHandler(page_table, current_vaddr);
+                DEBUG_ASSERT(handler);
+                handler->ReadBlock(current_vaddr, dest_buffer, copy_amount);
+                break;
+            }
             case PageType::RasterizerCachedMemory: {
                 if constexpr (!UNSAFE) {
                     RasterizerFlushVirtualRegion(current_vaddr, static_cast<u32>(copy_amount),
@@ -235,6 +255,12 @@ public:
                 std::memcpy(dest_ptr, src_buffer, copy_amount);
                 break;
             }
+            case PageType::Special: {
+                MMIORegionPointer handler = GetMMIOHandler(page_table, current_vaddr);
+                DEBUG_ASSERT(handler);
+                handler->WriteBlock(current_vaddr, src_buffer, copy_amount);
+                break;
+            }
             case PageType::RasterizerCachedMemory: {
                 if constexpr (!UNSAFE) {
                     RasterizerFlushVirtualRegion(current_vaddr, static_cast<u32>(copy_amount),
@@ -379,6 +405,16 @@ void MemorySystem::MapMemoryRegion(PageTable& page_table, VAddr base, u32 size,
     MapPages(page_table, base / CITRA_PAGE_SIZE, size / CITRA_PAGE_SIZE, target, PageType::Memory);
 }
 
+void MemorySystem::MapIoRegion(PageTable& page_table, VAddr base, u32 size,
+                               MMIORegionPointer mmio_handler) {
+    ASSERT_MSG((size & CITRA_PAGE_MASK) == 0, "non-page aligned size: {:08X}", size);
+    ASSERT_MSG((base & CITRA_PAGE_MASK) == 0, "non-page aligned base: {:08X}", base);
+    MapPages(page_table, base / CITRA_PAGE_SIZE, size / CITRA_PAGE_SIZE, nullptr,
+             PageType::Special);
+
+    page_table.special_regions.emplace_back(SpecialRegion{base, size, mmio_handler});
+}
+
 void MemorySystem::UnmapRegion(PageTable& page_table, VAddr base, u32 size) {
     ASSERT_MSG((size & CITRA_PAGE_MASK) == 0, "non-page aligned size: {:08X}", size);
     ASSERT_MSG((base & CITRA_PAGE_MASK) == 0, "non-page aligned base: {:08X}", base);
@@ -401,6 +437,9 @@ void MemorySystem::UnregisterPageTable(std::shared_ptr<PageTable> page_table) {
     }
 }
 
+template <typename T>
+T ReadMMIO(MMIORegionPointer mmio_handler, VAddr addr);
+
 template <typename T>
 T MemorySystem::Read(const VAddr vaddr) {
     const u8* page_pointer = impl->current_page_table->pointers[vaddr >> CITRA_PAGE_BITS];
@@ -443,6 +482,8 @@ T MemorySystem::Read(const VAddr vaddr) {
         std::memcpy(&value, GetPointerForRasterizerCache(vaddr), sizeof(T));
         return value;
     }
+    case PageType::Special:
+        return ReadMMIO<T>(impl->GetMMIOHandler(*impl->current_page_table, vaddr), vaddr);
     default:
         UNREACHABLE();
     }
@@ -450,6 +491,9 @@ T MemorySystem::Read(const VAddr vaddr) {
     return T{};
 }
 
+template <typename T>
+void WriteMMIO(MMIORegionPointer mmio_handler, VAddr addr, const T data);
+
 template <typename T>
 void MemorySystem::Write(const VAddr vaddr, const T data) {
     u8* page_pointer = impl->current_page_table->pointers[vaddr >> CITRA_PAGE_BITS];
@@ -487,6 +531,9 @@ void MemorySystem::Write(const VAddr vaddr, const T data) {
         std::memcpy(GetPointerForRasterizerCache(vaddr), &data, sizeof(T));
         break;
     }
+    case PageType::Special:
+        WriteMMIO<T>(impl->GetMMIOHandler(*impl->current_page_table, vaddr), vaddr, data);
+        break;
     default:
         UNREACHABLE();
     }
@@ -517,6 +564,9 @@ bool MemorySystem::WriteExclusive(const VAddr vaddr, const T data, const T expec
             reinterpret_cast<volatile T*>(GetPointerForRasterizerCache(vaddr).GetPtr());
         return Common::AtomicCompareAndSwap(volatile_pointer, data, expected);
     }
+    case PageType::Special:
+        WriteMMIO<T>(impl->GetMMIOHandler(*impl->current_page_table, vaddr), vaddr, data);
+        return false;
     default:
         UNREACHABLE();
     }
@@ -527,12 +577,18 @@ bool MemorySystem::IsValidVirtualAddress(const Kernel::Process& process, const V
     auto& page_table = *process.vm_manager.page_table;
 
     auto page_pointer = page_table.pointers[vaddr >> CITRA_PAGE_BITS];
-    if (page_pointer) {
+    if (page_pointer)
         return true;
-    }
 
-    if (page_table.attributes[vaddr >> CITRA_PAGE_BITS] == PageType::RasterizerCachedMemory) {
+    if (page_table.attributes[vaddr >> CITRA_PAGE_BITS] == PageType::RasterizerCachedMemory)
         return true;
+
+    if (page_table.attributes[vaddr >> CITRA_PAGE_BITS] != PageType::Special)
+        return false;
+
+    MMIORegionPointer mmio_region = impl->GetMMIOHandler(page_table, vaddr);
+    if (mmio_region) {
+        return mmio_region->IsValidAddress(vaddr);
     }
 
     return false;
@@ -867,6 +923,8 @@ void MemorySystem::ZeroBlock(const Kernel::Process& process, const VAddr dest_ad
     std::size_t page_index = dest_addr >> CITRA_PAGE_BITS;
     std::size_t page_offset = dest_addr & CITRA_PAGE_MASK;
 
+    static const std::array<u8, CITRA_PAGE_SIZE> zeros = {};
+
     while (remaining_size > 0) {
         const std::size_t copy_amount = std::min(CITRA_PAGE_SIZE - page_offset, remaining_size);
         const VAddr current_vaddr =
@@ -887,6 +945,12 @@ void MemorySystem::ZeroBlock(const Kernel::Process& process, const VAddr dest_ad
             std::memset(dest_ptr, 0, copy_amount);
             break;
         }
+        case PageType::Special: {
+            MMIORegionPointer handler = impl->GetMMIOHandler(page_table, current_vaddr);
+            DEBUG_ASSERT(handler);
+            handler->WriteBlock(current_vaddr, zeros.data(), copy_amount);
+            break;
+        }
         case PageType::RasterizerCachedMemory: {
             RasterizerFlushVirtualRegion(current_vaddr, static_cast<u32>(copy_amount),
                                          FlushMode::Invalidate);
@@ -936,6 +1000,14 @@ void MemorySystem::CopyBlock(const Kernel::Process& dest_process,
             WriteBlock(dest_process, dest_addr, src_ptr, copy_amount);
             break;
         }
+        case PageType::Special: {
+            MMIORegionPointer handler = impl->GetMMIOHandler(page_table, current_vaddr);
+            DEBUG_ASSERT(handler);
+            std::vector<u8> buffer(copy_amount);
+            handler->ReadBlock(current_vaddr, buffer.data(), buffer.size());
+            WriteBlock(dest_process, dest_addr, buffer.data(), buffer.size());
+            break;
+        }
         case PageType::RasterizerCachedMemory: {
             RasterizerFlushVirtualRegion(current_vaddr, static_cast<u32>(copy_amount),
                                          FlushMode::Flush);
@@ -955,6 +1027,46 @@ void MemorySystem::CopyBlock(const Kernel::Process& dest_process,
     }
 }
 
+template <>
+u8 ReadMMIO<u8>(MMIORegionPointer mmio_handler, VAddr addr) {
+    return mmio_handler->Read8(addr);
+}
+
+template <>
+u16 ReadMMIO<u16>(MMIORegionPointer mmio_handler, VAddr addr) {
+    return mmio_handler->Read16(addr);
+}
+
+template <>
+u32 ReadMMIO<u32>(MMIORegionPointer mmio_handler, VAddr addr) {
+    return mmio_handler->Read32(addr);
+}
+
+template <>
+u64 ReadMMIO<u64>(MMIORegionPointer mmio_handler, VAddr addr) {
+    return mmio_handler->Read64(addr);
+}
+
+template <>
+void WriteMMIO<u8>(MMIORegionPointer mmio_handler, VAddr addr, const u8 data) {
+    mmio_handler->Write8(addr, data);
+}
+
+template <>
+void WriteMMIO<u16>(MMIORegionPointer mmio_handler, VAddr addr, const u16 data) {
+    mmio_handler->Write16(addr, data);
+}
+
+template <>
+void WriteMMIO<u32>(MMIORegionPointer mmio_handler, VAddr addr, const u32 data) {
+    mmio_handler->Write32(addr, data);
+}
+
+template <>
+void WriteMMIO<u64>(MMIORegionPointer mmio_handler, VAddr addr, const u64 data) {
+    mmio_handler->Write64(addr, data);
+}
+
 u32 MemorySystem::GetFCRAMOffset(const u8* pointer) const {
     ASSERT(pointer >= impl->fcram.get() && pointer <= impl->fcram.get() + Memory::FCRAM_N3DS_SIZE);
     return static_cast<u32>(pointer - impl->fcram.get());

src/core/memory.h

@@ -10,6 +10,7 @@
 #include <boost/serialization/vector.hpp>
 #include "common/common_types.h"
 #include "common/memory_ref.h"
+#include "core/mmio.h"
 
 namespace Kernel {
 class Process;
@@ -42,6 +43,23 @@ enum class PageType {
     /// Page is mapped to regular memory, but also needs to check for rasterizer cache flushing and
     /// invalidation
     RasterizerCachedMemory,
+    /// Page is mapped to a I/O region. Writing and reading to this page is handled by functions.
+    Special,
+};
+
+struct SpecialRegion {
+    VAddr base;
+    u32 size;
+    MMIORegionPointer handler;
+
+private:
+    template <class Archive>
+    void serialize(Archive& ar, const unsigned int file_version) {
+        ar& base;
+        ar& size;
+        ar& handler;
+    }
+    friend class boost::serialization::access;
 };
 
 /**
@@ -90,6 +108,12 @@ struct PageTable {
 
     Pointers pointers;
 
+    /**
+     * Contains MMIO handlers that back memory regions whose entries in the `attribute` array is of
+     * type `Special`.
+     */
+    std::vector<SpecialRegion> special_regions;
+
     /**
      * Array of fine grained page attributes. If it is set to any value other than `Memory`, then
      * the corresponding entry in `pointers` MUST be set to null.
@@ -106,6 +130,7 @@ private:
     template <class Archive>
     void serialize(Archive& ar, const unsigned int) {
         ar& pointers.refs;
+        ar& special_regions;
         ar& attributes;
         for (std::size_t i = 0; i < PAGE_TABLE_NUM_ENTRIES; i++) {
             pointers.raw[i] = pointers.refs[i].GetPtr();
@@ -277,6 +302,15 @@ public:
      */
     void MapMemoryRegion(PageTable& page_table, VAddr base, u32 size, MemoryRef target);
 
+    /**
+     * Maps a region of the emulated process address space as a IO region.
+     * @param page_table The page table of the emulated process.
+     * @param base The address to start mapping at. Must be page-aligned.
+     * @param size The amount of bytes to map. Must be page-aligned.
+     * @param mmio_handler The handler that backs the mapping.
+     */
+    void MapIoRegion(PageTable& page_table, VAddr base, u32 size, MMIORegionPointer mmio_handler);
+
     void UnmapRegion(PageTable& page_table, VAddr base, u32 size);
 
     /// Currently active page table

src/core/mmio.h

@@ -0,0 +1,43 @@
+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include "common/common_types.h"
+
+namespace Memory {
+
+/**
+ * Represents a device with memory mapped IO.
+ * A device may be mapped to multiple regions of memory.
+ */
+class MMIORegion {
+public:
+    virtual ~MMIORegion() = default;
+
+    virtual bool IsValidAddress(VAddr addr) = 0;
+
+    virtual u8 Read8(VAddr addr) = 0;
+    virtual u16 Read16(VAddr addr) = 0;
+    virtual u32 Read32(VAddr addr) = 0;
+    virtual u64 Read64(VAddr addr) = 0;
+
+    virtual bool ReadBlock(VAddr src_addr, void* dest_buffer, std::size_t size) = 0;
+
+    virtual void Write8(VAddr addr, u8 data) = 0;
+    virtual void Write16(VAddr addr, u16 data) = 0;
+    virtual void Write32(VAddr addr, u32 data) = 0;
+    virtual void Write64(VAddr addr, u64 data) = 0;
+
+    virtual bool WriteBlock(VAddr dest_addr, const void* src_buffer, std::size_t size) = 0;
+
+private:
+    friend class boost::serialization::access;
+    template <class Archive>
+    void serialize(Archive& ar, const unsigned int file_version) {}
+};
+
+using MMIORegionPointer = std::shared_ptr<MMIORegion>;
+}; // namespace Memory

src/tests/CMakeLists.txt

@@ -2,6 +2,9 @@ add_executable(tests
     common/bit_field.cpp
     common/file_util.cpp
     common/param_package.cpp
+    core/arm/arm_test_common.cpp
+    core/arm/arm_test_common.h
+    core/arm/dyncom/arm_dyncom_vfp_tests.cpp
     core/core_timing.cpp
     core/file_sys/path_parser.cpp
     core/hle/kernel/hle_ipc.cpp
@@ -18,7 +21,7 @@ add_executable(tests
 create_target_directory_groups(tests)
 
 target_link_libraries(tests PRIVATE citra_common citra_core video_core audio_core)
-target_link_libraries(tests PRIVATE ${PLATFORM_LIBRARIES} catch2 nihstro-headers Threads::Threads)
+target_link_libraries(tests PRIVATE ${PLATFORM_LIBRARIES} Catch2::Catch2WithMain nihstro-headers Threads::Threads)
 
 add_test(NAME tests COMMAND tests)
 

src/tests/core/arm/arm_test_common.cpp

@@ -0,0 +1,143 @@
+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "core/core.h"
+#include "core/core_timing.h"
+#include "core/hle/kernel/process.h"
+#include "core/memory.h"
+#include "tests/core/arm/arm_test_common.h"
+
+namespace ArmTests {
+
+static std::shared_ptr<Memory::PageTable> page_table = nullptr;
+
+TestEnvironment::TestEnvironment(bool mutable_memory_)
+    : mutable_memory(mutable_memory_), test_memory(std::make_shared<TestMemory>(this)) {
+
+    timing = std::make_unique<Core::Timing>(1, 100);
+    system = std::make_unique<Core::System>();
+    memory = std::make_unique<Memory::MemorySystem>(*system);
+    kernel = std::make_unique<Kernel::KernelSystem>(
+        *memory, *timing, [] {}, Kernel::MemoryMode::Prod, 1,
+        Kernel::New3dsHwCapabilities{false, false, Kernel::New3dsMemoryMode::Legacy});
+
+    kernel->SetCurrentProcess(kernel->CreateProcess(kernel->CreateCodeSet("", 0)));
+    page_table = kernel->GetCurrentProcess()->vm_manager.page_table;
+
+    page_table->Clear();
+
+    memory->MapIoRegion(*page_table, 0x00000000, 0x80000000, test_memory);
+    memory->MapIoRegion(*page_table, 0x80000000, 0x80000000, test_memory);
+
+    kernel->SetCurrentMemoryPageTable(page_table);
+}
+
+TestEnvironment::~TestEnvironment() {
+    memory->UnmapRegion(*page_table, 0x80000000, 0x80000000);
+    memory->UnmapRegion(*page_table, 0x00000000, 0x80000000);
+}
+
+void TestEnvironment::SetMemory64(VAddr vaddr, u64 value) {
+    SetMemory32(vaddr + 0, static_cast<u32>(value));
+    SetMemory32(vaddr + 4, static_cast<u32>(value >> 32));
+}
+
+void TestEnvironment::SetMemory32(VAddr vaddr, u32 value) {
+    SetMemory16(vaddr + 0, static_cast<u16>(value));
+    SetMemory16(vaddr + 2, static_cast<u16>(value >> 16));
+}
+
+void TestEnvironment::SetMemory16(VAddr vaddr, u16 value) {
+    SetMemory8(vaddr + 0, static_cast<u8>(value));
+    SetMemory8(vaddr + 1, static_cast<u8>(value >> 8));
+}
+
+void TestEnvironment::SetMemory8(VAddr vaddr, u8 value) {
+    test_memory->data[vaddr] = value;
+}
+
+std::vector<WriteRecord> TestEnvironment::GetWriteRecords() const {
+    return write_records;
+}
+
+void TestEnvironment::ClearWriteRecords() {
+    write_records.clear();
+}
+
+TestEnvironment::TestMemory::~TestMemory() {}
+
+bool TestEnvironment::TestMemory::IsValidAddress(VAddr addr) {
+    return true;
+}
+
+u8 TestEnvironment::TestMemory::Read8(VAddr addr) {
+    auto iter = data.find(addr);
+    if (iter == data.end()) {
+        return addr; // Some arbitrary data
+    }
+    return iter->second;
+}
+
+u16 TestEnvironment::TestMemory::Read16(VAddr addr) {
+    return Read8(addr) | static_cast<u16>(Read8(addr + 1)) << 8;
+}
+
+u32 TestEnvironment::TestMemory::Read32(VAddr addr) {
+    return Read16(addr) | static_cast<u32>(Read16(addr + 2)) << 16;
+}
+
+u64 TestEnvironment::TestMemory::Read64(VAddr addr) {
+    return Read32(addr) | static_cast<u64>(Read32(addr + 4)) << 32;
+}
+
+bool TestEnvironment::TestMemory::ReadBlock(VAddr src_addr, void* dest_buffer, std::size_t size) {
+    VAddr addr = src_addr;
+    u8* data = static_cast<u8*>(dest_buffer);
+
+    for (std::size_t i = 0; i < size; i++, addr++, data++) {
+        *data = Read8(addr);
+    }
+
+    return true;
+}
+
+void TestEnvironment::TestMemory::Write8(VAddr addr, u8 data) {
+    env->write_records.emplace_back(8, addr, data);
+    if (env->mutable_memory)
+        env->SetMemory8(addr, data);
+}
+
+void TestEnvironment::TestMemory::Write16(VAddr addr, u16 data) {
+    env->write_records.emplace_back(16, addr, data);
+    if (env->mutable_memory)
+        env->SetMemory16(addr, data);
+}
+
+void TestEnvironment::TestMemory::Write32(VAddr addr, u32 data) {
+    env->write_records.emplace_back(32, addr, data);
+    if (env->mutable_memory)
+        env->SetMemory32(addr, data);
+}
+
+void TestEnvironment::TestMemory::Write64(VAddr addr, u64 data) {
+    env->write_records.emplace_back(64, addr, data);
+    if (env->mutable_memory)
+        env->SetMemory64(addr, data);
+}
+
+bool TestEnvironment::TestMemory::WriteBlock(VAddr dest_addr, const void* src_buffer,
+                                             std::size_t size) {
+    VAddr addr = dest_addr;
+    const u8* data = static_cast<const u8*>(src_buffer);
+
+    for (std::size_t i = 0; i < size; i++, addr++, data++) {
+        env->write_records.emplace_back(8, addr, *data);
+        if (env->mutable_memory)
+            env->SetMemory8(addr, *data);
+    }
+
+    return true;
+}
+
+} // namespace ArmTests

src/tests/core/arm/arm_test_common.h

@@ -0,0 +1,93 @@
+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <tuple>
+#include <unordered_map>
+#include <vector>
+#include "common/common_types.h"
+#include "core/hle/kernel/kernel.h"
+#include "core/mmio.h"
+
+namespace ArmTests {
+
+struct WriteRecord {
+    WriteRecord(std::size_t size, VAddr addr, u64 data) : size(size), addr(addr), data(data) {}
+    std::size_t size;
+    VAddr addr;
+    u64 data;
+    bool operator==(const WriteRecord& o) const {
+        return std::tie(size, addr, data) == std::tie(o.size, o.addr, o.data);
+    }
+};
+
+class TestEnvironment final {
+public:
+    /*
+     * Inititalise test environment
+     * @param mutable_memory If false, writes to memory can never be read back.
+     *                       (Memory is immutable.)
+     */
+    explicit TestEnvironment(bool mutable_memory = false);
+
+    /// Shutdown test environment
+    ~TestEnvironment();
+
+    /// Sets value at memory location vaddr.
+    void SetMemory8(VAddr vaddr, u8 value);
+    void SetMemory16(VAddr vaddr, u16 value);
+    void SetMemory32(VAddr vaddr, u32 value);
+    void SetMemory64(VAddr vaddr, u64 value);
+
+    /**
+     * Whenever Memory::Write{8,16,32,64} is called within the test environment,
+     * a new write-record is made.
+     * @returns A vector of write records made since they were last cleared.
+     */
+    std::vector<WriteRecord> GetWriteRecords() const;
+
+    /// Empties the internal write-record store.
+    void ClearWriteRecords();
+
+    Memory::MemorySystem& GetMemory() {
+        return *memory;
+    }
+
+private:
+    friend struct TestMemory;
+    struct TestMemory final : Memory::MMIORegion {
+        explicit TestMemory(TestEnvironment* env_) : env(env_) {}
+        TestEnvironment* env;
+
+        ~TestMemory() override;
+
+        bool IsValidAddress(VAddr addr) override;
+
+        u8 Read8(VAddr addr) override;
+        u16 Read16(VAddr addr) override;
+        u32 Read32(VAddr addr) override;
+        u64 Read64(VAddr addr) override;
+
+        bool ReadBlock(VAddr src_addr, void* dest_buffer, std::size_t size) override;
+
+        void Write8(VAddr addr, u8 data) override;
+        void Write16(VAddr addr, u16 data) override;
+        void Write32(VAddr addr, u32 data) override;
+        void Write64(VAddr addr, u64 data) override;
+
+        bool WriteBlock(VAddr dest_addr, const void* src_buffer, std::size_t size) override;
+
+        std::unordered_map<VAddr, u8> data;
+    };
+
+    bool mutable_memory;
+    std::shared_ptr<TestMemory> test_memory;
+    std::vector<WriteRecord> write_records;
+
+    std::unique_ptr<Core::Timing> timing;
+    std::unique_ptr<Core::System> system;
+    std::unique_ptr<Memory::MemorySystem> memory;
+    std::unique_ptr<Kernel::KernelSystem> kernel;
+};
+
+} // namespace ArmTests

src/tests/core/arm/dyncom/arm_dyncom_vfp_tests.cpp

@@ -0,0 +1,51 @@
+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <catch2/catch_test_macros.hpp>
+#include "core/arm/dyncom/arm_dyncom.h"
+#include "core/core.h"
+#include "core/core_timing.h"
+#include "tests/core/arm/arm_test_common.h"
+
+namespace ArmTests {
+
+struct VfpTestCase {
+    u32 initial_fpscr;
+    u32 a;
+    u32 b;
+    u32 result;
+    u32 final_fpscr;
+};
+
+TEST_CASE("ARM_DynCom (vfp): vadd", "[arm_dyncom]") {
+    TestEnvironment test_env(false);
+    test_env.SetMemory32(0, 0xEE321A03); // vadd.f32 s2, s4, s6
+    test_env.SetMemory32(4, 0xEAFFFFFE); // b +#0
+
+    Core::System system;
+    Core::ARM_DynCom dyncom(system, test_env.GetMemory(), USER32MODE, 0, nullptr);
+
+    std::vector<VfpTestCase> test_cases{{
+#include "vfp_vadd_f32.inc"
+    }};
+
+    for (const auto& test_case : test_cases) {
+        dyncom.SetPC(0);
+        dyncom.SetVFPSystemReg(VFP_FPSCR, test_case.initial_fpscr);
+        dyncom.SetVFPReg(4, test_case.a);
+        dyncom.SetVFPReg(6, test_case.b);
+        dyncom.Step();
+        if (dyncom.GetVFPReg(2) != test_case.result ||
+            dyncom.GetVFPSystemReg(VFP_FPSCR) != test_case.final_fpscr) {
+            printf("f: %x\n", test_case.initial_fpscr);
+            printf("a: %x\n", test_case.a);
+            printf("b: %x\n", test_case.b);
+            printf("c: %x (%x)\n", dyncom.GetVFPReg(2), test_case.result);
+            printf("f: %x (%x)\n", dyncom.GetVFPSystemReg(VFP_FPSCR), test_case.final_fpscr);
+            FAIL();
+        }
+    }
+}
+
+} // namespace ArmTests