Kernel: Convert SharedMemory to not use Handles

src/core/hle/kernel/shared_memory.cpp

@@ -9,68 +9,39 @@
 
 namespace Kernel {
 
-class SharedMemory : public Object {
-public:
-    std::string GetTypeName() const override { return "SharedMemory"; }
+ResultVal<SharedPtr<SharedMemory>> SharedMemory::Create(std::string name) {
+    SharedPtr<SharedMemory> shared_memory(new SharedMemory);
 
-    static const HandleType HANDLE_TYPE = HandleType::SharedMemory;
-    HandleType GetHandleType() const override { return HANDLE_TYPE; }
+    // TOOD(yuriks): Don't create Handle (see Thread::Create())
+    CASCADE_RESULT(auto unused, Kernel::g_handle_table.Create(shared_memory));
 
-    u32 base_address;                   ///< Address of shared memory block in RAM
-    MemoryPermission permissions;       ///< Permissions of shared memory block (SVC field)
-    MemoryPermission other_permissions; ///< Other permissions of shared memory block (SVC field)
-    std::string name;                   ///< Name of shared memory object (optional)
-};
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-/**
- * Creates a shared memory object
- * @param handle Handle of newly created shared memory object
- * @param name Name of shared memory object
- * @return Pointer to newly created shared memory object
- */
-static SharedMemory* CreateSharedMemory(Handle& handle, const std::string& name) {
-    SharedMemory* shared_memory = new SharedMemory;
-    // TOOD(yuriks): Fix error reporting
-    handle = Kernel::g_handle_table.Create(shared_memory).ValueOr(INVALID_HANDLE);
-    shared_memory->name = name;
-    return shared_memory;
+    shared_memory->name = std::move(name);
+    return MakeResult<SharedPtr<SharedMemory>>(std::move(shared_memory));
 }
 
-Handle CreateSharedMemory(const std::string& name) {
-    Handle handle;
-    CreateSharedMemory(handle, name);
-    return handle;
-}
-
-ResultCode MapSharedMemory(u32 handle, u32 address, MemoryPermission permissions,
-    MemoryPermission other_permissions) {
+ResultCode SharedMemory::Map(VAddr address, MemoryPermission permissions,
+        MemoryPermission other_permissions) {
 
     if (address < Memory::SHARED_MEMORY_VADDR || address >= Memory::SHARED_MEMORY_VADDR_END) {
-        LOG_ERROR(Kernel_SVC, "cannot map handle=0x%08X, address=0x%08X outside of shared mem bounds!",
-            handle, address);
+        LOG_ERROR(Kernel, "cannot map handle=0x%08X, address=0x%08X outside of shared mem bounds!",
+                GetHandle(), address);
+        // TODO: Verify error code with hardware
         return ResultCode(ErrorDescription::InvalidAddress, ErrorModule::Kernel,
                 ErrorSummary::InvalidArgument, ErrorLevel::Permanent);
     }
-    SharedMemory* shared_memory = Kernel::g_handle_table.Get<SharedMemory>(handle).get();
-    if (shared_memory == nullptr) return InvalidHandle(ErrorModule::Kernel);
 
-    shared_memory->base_address = address;
-    shared_memory->permissions = permissions;
-    shared_memory->other_permissions = other_permissions;
+    base_address = address;
+    permissions = permissions;
+    other_permissions = other_permissions;
 
     return RESULT_SUCCESS;
 }
 
-ResultVal<u8*> GetSharedMemoryPointer(Handle handle, u32 offset) {
-    SharedMemory* shared_memory = Kernel::g_handle_table.Get<SharedMemory>(handle).get();
-    if (shared_memory == nullptr) return InvalidHandle(ErrorModule::Kernel);
+ResultVal<u8*> SharedMemory::GetPointer(u32 offset) {
+    if (base_address != 0)
+        return MakeResult<u8*>(Memory::GetPointer(base_address + offset));
 
-    if (0 != shared_memory->base_address)
-        return MakeResult<u8*>(Memory::GetPointer(shared_memory->base_address + offset));
-
-    LOG_ERROR(Kernel_SVC, "memory block handle=0x%08X not mapped!", handle);
+    LOG_ERROR(Kernel_SVC, "memory block handle=0x%08X not mapped!", GetHandle());
     // TODO(yuriks): Verify error code.
     return ResultCode(ErrorDescription::InvalidAddress, ErrorModule::Kernel,
             ErrorSummary::InvalidState, ErrorLevel::Permanent);

src/core/hle/kernel/shared_memory.h

@@ -23,29 +23,41 @@ enum class MemoryPermission : u32 {
     DontCare         = (1u << 28)
 };
 
-/**
- * Creates a shared memory object
- * @param name Optional name of shared memory object
- * @return Handle of newly created shared memory object
- */
-Handle CreateSharedMemory(const std::string& name="Unknown");
+class SharedMemory : public Object {
+public:
+    /**
+     * Creates a shared memory object
+     * @param name Optional object name, used only for debugging purposes.
+     */
+    static ResultVal<SharedPtr<SharedMemory>> Create(std::string name = "Unknown");
 
-/**
- * Maps a shared memory block to an address in system memory
- * @param handle Shared memory block handle
- * @param address Address in system memory to map shared memory block to
- * @param permissions Memory block map permissions (specified by SVC field)
- * @param other_permissions Memory block map other permissions (specified by SVC field)
- */
-ResultCode MapSharedMemory(Handle handle, u32 address, MemoryPermission permissions,
-    MemoryPermission other_permissions);
+    std::string GetTypeName() const override { return "SharedMemory"; }
 
-/**
- * Gets a pointer to the shared memory block
- * @param handle Shared memory block handle
- * @param offset Offset from the start of the shared memory block to get pointer
- * @return Pointer to the shared memory block from the specified offset
- */
-ResultVal<u8*> GetSharedMemoryPointer(Handle handle, u32 offset);
+    static const HandleType HANDLE_TYPE = HandleType::SharedMemory;
+    HandleType GetHandleType() const override { return HANDLE_TYPE; }
+
+    /**
+     * Maps a shared memory block to an address in system memory
+     * @param address Address in system memory to map shared memory block to
+     * @param permissions Memory block map permissions (specified by SVC field)
+     * @param other_permissions Memory block map other permissions (specified by SVC field)
+     */
+    ResultCode Map(VAddr address, MemoryPermission permissions, MemoryPermission other_permissions);
+
+    /**
+    * Gets a pointer to the shared memory block
+    * @param offset Offset from the start of the shared memory block to get pointer
+    * @return Pointer to the shared memory block from the specified offset
+    */
+    ResultVal<u8*> GetPointer(u32 offset = 0);
+
+    VAddr base_address;                   ///< Address of shared memory block in RAM
+    MemoryPermission permissions;       ///< Permissions of shared memory block (SVC field)
+    MemoryPermission other_permissions; ///< Other permissions of shared memory block (SVC field)
+    std::string name;                   ///< Name of shared memory object (optional)
+
+private:
+    SharedMemory() = default;
+};
 
 } // namespace

src/core/hle/service/apt_u.cpp

@@ -26,7 +26,7 @@ namespace APT_U {
 static const VAddr SHARED_FONT_VADDR = 0x18000000;
 
 /// Handle to shared memory region designated to for shared system font
-static Handle shared_font_mem = 0;
+static Kernel::SharedPtr<Kernel::SharedMemory> shared_font_mem;
 
 static Handle lock_handle = 0;
 static Handle notification_event_handle = 0; ///< APT notification event handle
@@ -354,7 +354,7 @@ void GetSharedFont(Service::Interface* self) {
         cmd_buff[0] = 0x00440082;
         cmd_buff[1] = RESULT_SUCCESS.raw; // No error
         cmd_buff[2] = SHARED_FONT_VADDR;
-        cmd_buff[4] = shared_font_mem;
+        cmd_buff[4] = Kernel::g_handle_table.Create(shared_font_mem).MoveFrom();
     } else {
         cmd_buff[1] = -1; // Generic error (not really possible to verify this on hardware)
         LOG_ERROR(Kernel_SVC, "called, but %s has not been loaded!", SHARED_FONT);
@@ -514,10 +514,10 @@ Interface::Interface() {
         file.ReadBytes(shared_font.data(), (size_t)file.GetSize());
 
         // Create shared font memory object
-        shared_font_mem = Kernel::CreateSharedMemory("APT_U:shared_font_mem");
+        shared_font_mem = Kernel::SharedMemory::Create("APT_U:shared_font_mem").MoveFrom();
     } else {
         LOG_WARNING(Service_APT, "Unable to load shared font: %s", filepath.c_str());
-        shared_font_mem = 0;
+        shared_font_mem = nullptr;
     }
 
     lock_handle = 0;

src/core/hle/service/gsp_gpu.cpp

@@ -23,12 +23,12 @@ GraphicsDebugger g_debugger;
 namespace GSP_GPU {
 
 Handle g_interrupt_event = 0;   ///< Handle to event triggered when GSP interrupt has been signalled
-Handle g_shared_memory = 0;     ///< Handle to GSP shared memorys
+Kernel::SharedPtr<Kernel::SharedMemory> g_shared_memory; ///< GSP shared memoryings
 u32 g_thread_id = 1;            ///< Thread index into interrupt relay queue, 1 is arbitrary
 
 /// Gets a pointer to a thread command buffer in GSP shared memory
 static inline u8* GetCommandBuffer(u32 thread_id) {
-    ResultVal<u8*> ptr = Kernel::GetSharedMemoryPointer(g_shared_memory, 0x800 + (thread_id * sizeof(CommandBuffer)));
+    ResultVal<u8*> ptr = g_shared_memory->GetPointer(0x800 + (thread_id * sizeof(CommandBuffer)));
     return ptr.ValueOr(nullptr);
 }
 
@@ -37,13 +37,13 @@ static inline FrameBufferUpdate* GetFrameBufferInfo(u32 thread_id, u32 screen_in
 
     // For each thread there are two FrameBufferUpdate fields
     u32 offset = 0x200 + (2 * thread_id + screen_index) * sizeof(FrameBufferUpdate);
-    ResultVal<u8*> ptr = Kernel::GetSharedMemoryPointer(g_shared_memory, offset);
+    ResultVal<u8*> ptr = g_shared_memory->GetPointer(offset);
     return reinterpret_cast<FrameBufferUpdate*>(ptr.ValueOr(nullptr));
 }
 
 /// Gets a pointer to the interrupt relay queue for a given thread index
 static inline InterruptRelayQueue* GetInterruptRelayQueue(u32 thread_id) {
-    ResultVal<u8*> ptr = Kernel::GetSharedMemoryPointer(g_shared_memory, sizeof(InterruptRelayQueue) * thread_id);
+    ResultVal<u8*> ptr = g_shared_memory->GetPointer(sizeof(InterruptRelayQueue) * thread_id);
     return reinterpret_cast<InterruptRelayQueue*>(ptr.ValueOr(nullptr));
 }
 
@@ -182,13 +182,15 @@ static void RegisterInterruptRelayQueue(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
     u32 flags = cmd_buff[1];
     g_interrupt_event = cmd_buff[3];
-    g_shared_memory = Kernel::CreateSharedMemory("GSPSharedMem");
+    g_shared_memory = Kernel::SharedMemory::Create("GSPSharedMem").MoveFrom();
 
     _assert_msg_(GSP, (g_interrupt_event != 0), "handle is not valid!");
 
+    Handle shmem_handle = Kernel::g_handle_table.Create(g_shared_memory).MoveFrom();
+
     cmd_buff[1] = 0x2A07; // Value verified by 3dmoo team, purpose unknown, but needed for GSP init
     cmd_buff[2] = g_thread_id++; // Thread ID
-    cmd_buff[4] = g_shared_memory; // GSP shared memory
+    cmd_buff[4] = shmem_handle; // GSP shared memory
 
     Kernel::SignalEvent(g_interrupt_event); // TODO(bunnei): Is this correct?
 }
@@ -204,7 +206,7 @@ void SignalInterrupt(InterruptId interrupt_id) {
         LOG_WARNING(Service_GSP, "cannot synchronize until GSP event has been created!");
         return;
     }
-    if (0 == g_shared_memory) {
+    if (nullptr == g_shared_memory) {
         LOG_WARNING(Service_GSP, "cannot synchronize until GSP shared memory has been created!");
         return;
     }

src/core/hle/service/hid/hid.cpp

@@ -12,7 +12,7 @@
 namespace Service {
 namespace HID {
 
-Handle g_shared_mem = 0;
+Kernel::SharedPtr<Kernel::SharedMemory> g_shared_mem = nullptr;
 
 Handle g_event_pad_or_touch_1 = 0;
 Handle g_event_pad_or_touch_2 = 0;
@@ -30,7 +30,7 @@ static s16 next_circle_y = 0;
  * Gets a pointer to the PadData structure inside HID shared memory
  */
 static inline PadData* GetPadData() {
-    return reinterpret_cast<PadData*>(Kernel::GetSharedMemoryPointer(g_shared_mem, 0).ValueOr(nullptr));
+    return reinterpret_cast<PadData*>(g_shared_mem->GetPointer().ValueOr(nullptr));
 }
 
 /**
@@ -120,7 +120,7 @@ void PadUpdateComplete() {
 }
 
 void HIDInit() {
-    g_shared_mem = Kernel::CreateSharedMemory("HID:SharedMem"); // Create shared memory object
+    g_shared_mem = Kernel::SharedMemory::Create("HID:SharedMem").MoveFrom();
 
     // Create event handles
     g_event_pad_or_touch_1 = Kernel::CreateEvent(RESETTYPE_ONESHOT, "HID:EventPadOrTouch1");

src/core/hle/service/hid/hid.h

@@ -9,11 +9,15 @@
 #include "core/hle/kernel/kernel.h"
 #include "common/bit_field.h"
 
+namespace Kernel {
+    class SharedMemory;
+}
+
 namespace Service {
 namespace HID {
 
 // Handle to shared memory region designated to HID_User service
-extern Handle g_shared_mem;
+extern Kernel::SharedPtr<Kernel::SharedMemory> g_shared_mem;
 
 // Event handles
 extern Handle g_event_pad_or_touch_1;

src/core/hle/service/hid/hid_user.cpp

@@ -5,6 +5,7 @@
 #include "common/log.h"
 
 #include "core/hle/hle.h"
+#include "core/hle/kernel/shared_memory.h"
 #include "core/hle/service/hid/hid.h"
 #include "hid_user.h"
 
@@ -46,7 +47,8 @@ void GetIPCHandles(Service::Interface* self) {
     u32* cmd_buff = Kernel::GetCommandBuffer();
 
     cmd_buff[1] = 0; // No error
-    cmd_buff[3] = Service::HID::g_shared_mem;
+    // TODO(yuriks): Return error from SendSyncRequest is this fails (part of IPC marshalling)
+    cmd_buff[3] = Kernel::g_handle_table.Create(Service::HID::g_shared_mem).MoveFrom();
     cmd_buff[4] = Service::HID::g_event_pad_or_touch_1;
     cmd_buff[5] = Service::HID::g_event_pad_or_touch_2;
     cmd_buff[6] = Service::HID::g_event_accelerometer;

src/core/hle/svc.cpp

@@ -63,21 +63,28 @@ static Result ControlMemory(u32* out_addr, u32 operation, u32 addr0, u32 addr1,
 
 /// Maps a memory block to specified address
 static Result MapMemoryBlock(Handle handle, u32 addr, u32 permissions, u32 other_permissions) {
+    using Kernel::SharedMemory;
+    using Kernel::MemoryPermission;
+
     LOG_TRACE(Kernel_SVC, "called memblock=0x%08X, addr=0x%08X, mypermissions=0x%08X, otherpermission=%d",
         handle, addr, permissions, other_permissions);
 
-    Kernel::MemoryPermission permissions_type = static_cast<Kernel::MemoryPermission>(permissions);
+    SharedPtr<SharedMemory> shared_memory = Kernel::g_handle_table.Get<SharedMemory>(handle);
+    if (shared_memory == nullptr)
+        return InvalidHandle(ErrorModule::Kernel).raw;
+
+    MemoryPermission permissions_type = static_cast<MemoryPermission>(permissions);
     switch (permissions_type) {
-    case Kernel::MemoryPermission::Read:
-    case Kernel::MemoryPermission::Write:
-    case Kernel::MemoryPermission::ReadWrite:
-    case Kernel::MemoryPermission::Execute:
-    case Kernel::MemoryPermission::ReadExecute:
-    case Kernel::MemoryPermission::WriteExecute:
-    case Kernel::MemoryPermission::ReadWriteExecute:
-    case Kernel::MemoryPermission::DontCare:
-        Kernel::MapSharedMemory(handle, addr, permissions_type,
-            static_cast<Kernel::MemoryPermission>(other_permissions));
+    case MemoryPermission::Read:
+    case MemoryPermission::Write:
+    case MemoryPermission::ReadWrite:
+    case MemoryPermission::Execute:
+    case MemoryPermission::ReadExecute:
+    case MemoryPermission::WriteExecute:
+    case MemoryPermission::ReadWriteExecute:
+    case MemoryPermission::DontCare:
+        shared_memory->Map(addr, permissions_type,
+                static_cast<MemoryPermission>(other_permissions));
         break;
     default:
         LOG_ERROR(Kernel_SVC, "unknown permissions=0x%08X", permissions);
@@ -463,12 +470,19 @@ static s64 GetSystemTick() {
 
 /// Creates a memory block at the specified address with the specified permissions and size
 static Result CreateMemoryBlock(Handle* memblock, u32 addr, u32 size, u32 my_permission,
-    u32 other_permission) {
-
+        u32 other_permission) {
+    using Kernel::SharedMemory;
     // TODO(Subv): Implement this function
 
-    Handle shared_memory = Kernel::CreateSharedMemory();
-    *memblock = shared_memory;
+    ResultVal<SharedPtr<SharedMemory>> shared_memory_res = SharedMemory::Create();
+    if (shared_memory_res.Failed())
+        return shared_memory_res.Code().raw;
+
+    ResultVal<Handle> handle_res = Kernel::g_handle_table.Create(*shared_memory_res);
+    if (handle_res.Failed())
+        return handle_res.Code().raw;
+
+    *memblock = *handle_res;
     LOG_WARNING(Kernel_SVC, "(STUBBED) called addr=0x%08X", addr);
     return 0;
 }