HLE/SVC: Implement UnmapMemoryBlock.

This implementation will need to be (almost completely) changed when we implement multiprocess support.

src/core/hle/function_wrappers.h

@@ -188,6 +188,10 @@ template<ResultCode func(s64*, Handle, u32)> void Wrap() {
     FuncReturn(retval);
 }
 
+template<ResultCode func(Handle, u32)> void Wrap() {
+    FuncReturn(func(PARAM(0), PARAM(1)).raw);
+}
+
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 // Function wrappers that return type u32
 

src/core/hle/kernel/shared_memory.cpp

@@ -39,6 +39,12 @@ ResultCode SharedMemory::Map(VAddr address, MemoryPermission permissions,
             ErrorSummary::InvalidArgument, ErrorLevel::Permanent);
     }
 
+    // TODO(Subv): Return E0E01BEE when permissions and other_permissions don't
+    // match what was specified when the memory block was created.
+
+    // TODO(Subv): Return E0E01BEE when address should be 0.
+    // Note: Find out when that's the case.
+
     if (fixed_address != 0) {
          if (address != 0 && address != fixed_address) {
             LOG_ERROR(Kernel, "cannot map id=%u, address=0x%08X name=%s: fixed_addres is 0x%08X!",
@@ -74,6 +80,21 @@ ResultCode SharedMemory::Map(VAddr address, MemoryPermission permissions,
     return RESULT_SUCCESS;
 }
 
+ResultCode SharedMemory::Unmap(VAddr address) {
+    if (base_address == 0) {
+        // TODO(Subv): Verify what actually happens when you want to unmap a memory block that
+        // was originally mapped with address = 0
+        return ResultCode(ErrorDescription::InvalidAddress, ErrorModule::OS, ErrorSummary::InvalidArgument, ErrorLevel::Usage);
+    }
+
+    if (base_address != address)
+        return ResultCode(ErrorDescription::WrongAddress, ErrorModule::OS, ErrorSummary::InvalidState, ErrorLevel::Usage);
+
+    base_address = 0;
+
+    return RESULT_SUCCESS;
+}
+
 u8* SharedMemory::GetPointer(u32 offset) {
     if (base_address != 0)
         return Memory::GetPointer(base_address + offset);

src/core/hle/kernel/shared_memory.h

@@ -52,6 +52,13 @@ public:
      */
     ResultCode Map(VAddr address, MemoryPermission permissions, MemoryPermission other_permissions);
 
+    /**
+     * Unmaps a shared memory block from the specified address in system memory
+     * @param address Address in system memory where the shared memory block is mapped
+     * @return Result code of the unmap operation
+     */
+    ResultCode Unmap(VAddr address);
+
     /**
     * Gets a pointer to the shared memory block
     * @param offset Offset from the start of the shared memory block to get pointer

src/core/hle/result.h

@@ -18,6 +18,7 @@
 /// Detailed description of the error. This listing is likely incomplete.
 enum class ErrorDescription : u32 {
     Success = 0,
+    WrongAddress = 53,
     FS_NotFound = 100,
     FS_NotFormatted = 340, ///< This is used by the FS service when creating a SaveData archive
     InvalidSection = 1000,

src/core/hle/svc.cpp

@@ -161,6 +161,8 @@ static ResultCode MapMemoryBlock(Handle handle, u32 addr, u32 permissions, u32 o
     LOG_TRACE(Kernel_SVC, "called memblock=0x%08X, addr=0x%08X, mypermissions=0x%08X, otherpermission=%d",
         handle, addr, permissions, other_permissions);
 
+    // TODO(Subv): The same process that created a SharedMemory object can not map it in its own address space
+
     SharedPtr<SharedMemory> shared_memory = Kernel::g_handle_table.Get<SharedMemory>(handle);
     if (shared_memory == nullptr)
         return ERR_INVALID_HANDLE;
@@ -175,13 +177,27 @@ static ResultCode MapMemoryBlock(Handle handle, u32 addr, u32 permissions, u32 o
     case MemoryPermission::WriteExecute:
     case MemoryPermission::ReadWriteExecute:
     case MemoryPermission::DontCare:
-        shared_memory->Map(addr, permissions_type,
+        return shared_memory->Map(addr, permissions_type,
                 static_cast<MemoryPermission>(other_permissions));
-        break;
     default:
         LOG_ERROR(Kernel_SVC, "unknown permissions=0x%08X", permissions);
     }
-    return RESULT_SUCCESS;
+
+    return ResultCode(ErrorDescription::InvalidCombination, ErrorModule::OS, ErrorSummary::InvalidArgument, ErrorLevel::Usage);
+}
+
+static ResultCode UnmapMemoryBlock(Handle handle, u32 addr) {
+    using Kernel::SharedMemory;
+
+    LOG_TRACE(Kernel_SVC, "called memblock=0x%08X, addr=0x%08X", handle, addr);
+
+    // TODO(Subv): Return E0A01BF5 if the address is not in the application's heap
+
+    SharedPtr<SharedMemory> shared_memory = Kernel::g_handle_table.Get<SharedMemory>(handle);
+    if (shared_memory == nullptr)
+        return ERR_INVALID_HANDLE;
+
+    return shared_memory->Unmap(addr);
 }
 
 /// Connect to an OS service given the port name, returns the handle to the port to out
@@ -765,7 +781,13 @@ static s64 GetSystemTick() {
 static ResultCode CreateMemoryBlock(Handle* out_handle, u32 addr, u32 size, u32 my_permission,
         u32 other_permission) {
     using Kernel::SharedMemory;
-    // TODO(Subv): Implement this function
+
+    if (size % Memory::PAGE_SIZE != 0)
+        return ResultCode(ErrorDescription::MisalignedSize, ErrorModule::OS, ErrorSummary::InvalidArgument, ErrorLevel::Usage);
+
+    // TODO(Subv): Return E0A01BF5 if the address is not in the application's heap
+
+    // TODO(Subv): Implement this function properly
 
     using Kernel::MemoryPermission;
     SharedPtr<SharedMemory> shared_memory = SharedMemory::Create(size,
@@ -912,7 +934,7 @@ static const FunctionDef SVC_Table[] = {
     {0x1D, HLE::Wrap<ClearTimer>,           "ClearTimer"},
     {0x1E, HLE::Wrap<CreateMemoryBlock>,    "CreateMemoryBlock"},
     {0x1F, HLE::Wrap<MapMemoryBlock>,       "MapMemoryBlock"},
-    {0x20, nullptr,                         "UnmapMemoryBlock"},
+    {0x20, HLE::Wrap<UnmapMemoryBlock>,     "UnmapMemoryBlock"},
     {0x21, HLE::Wrap<CreateAddressArbiter>, "CreateAddressArbiter"},
     {0x22, HLE::Wrap<ArbitrateAddress>,     "ArbitrateAddress"},
     {0x23, HLE::Wrap<CloseHandle>,          "CloseHandle"},