Merge pull request #3077 from Subv/hle_static_buffer

Kernel/IPC: Implement StaticBuffer translation for HLE services that use the HLERequestContext architecture.

src/core/hle/ipc.h

@@ -40,13 +40,16 @@ static const int kStaticBuffersOffset = 0x100;
 inline u32* GetStaticBuffers(const int offset = 0) {
     return GetCommandBuffer(kStaticBuffersOffset + offset);
 }
-}
+} // namespace Kernel
 
 namespace IPC {
 
 /// Size of the command buffer area, in 32-bit words.
 constexpr size_t COMMAND_BUFFER_LENGTH = 0x100 / sizeof(u32);
 
+// Maximum number of static buffers per thread.
+constexpr size_t MAX_STATIC_BUFFERS = 16;
+
 // These errors are commonly returned by invalid IPC translations, so alias them here for
 // convenience.
 // TODO(yuriks): These will probably go away once translation is implemented inside the kernel.

src/core/hle/ipc_helpers.h

@@ -8,6 +8,7 @@
 #include <tuple>
 #include <type_traits>
 #include <utility>
+#include <vector>
 #include "core/hle/ipc.h"
 #include "core/hle/kernel/handle_table.h"
 #include "core/hle/kernel/hle_ipc.h"
@@ -117,7 +118,8 @@ public:
 
     void PushCurrentPIDHandle();
 
-    void PushStaticBuffer(VAddr buffer_vaddr, size_t size, u8 buffer_id);
+    [[deprecated]] void PushStaticBuffer(VAddr buffer_vaddr, size_t size, u8 buffer_id);
+    void PushStaticBuffer(const std::vector<u8>& buffer, u8 buffer_id);
 
     void PushMappedBuffer(VAddr buffer_vaddr, size_t size, MappedBufferPermissions perms);
 };
@@ -195,6 +197,16 @@ inline void RequestBuilder::PushStaticBuffer(VAddr buffer_vaddr, size_t size, u8
     Push(buffer_vaddr);
 }
 
+inline void RequestBuilder::PushStaticBuffer(const std::vector<u8>& buffer, u8 buffer_id) {
+    ASSERT_MSG(buffer_id < MAX_STATIC_BUFFERS, "Invalid static buffer id");
+
+    Push(StaticBufferDesc(buffer.size(), buffer_id));
+    // This address will be replaced by the correct static buffer address during IPC translation.
+    Push<VAddr>(0xDEADC0DE);
+
+    context->AddStaticBuffer(buffer_id, buffer);
+}
+
 inline void RequestBuilder::PushMappedBuffer(VAddr buffer_vaddr, size_t size,
                                              MappedBufferPermissions perms) {
     Push(MappedBufferDesc(size, perms));
@@ -295,17 +307,23 @@ public:
      * @brief Pops the static buffer vaddr
      * @return                  The virtual address of the buffer
      * @param[out] data_size    If non-null, the pointed value will be set to the size of the data
-     * @param[out] useStaticBuffersToGetVaddr Indicates if we should read the vaddr from the static
-     * buffers (which is the correct thing to do, but no service presently implement it) instead of
-     * using the same value as the process who sent the request
-     * given by the source process
      *
-     * Static buffers must be set up before any IPC request using those is sent.
+     * In real services, static buffers must be set up before any IPC request using those is sent.
      * It is the duty of the process (usually services) to allocate and set up the receiving static
-     * buffer information
+     * buffer information. Our HLE services do not need to set up the buffers beforehand.
      * Please note that the setup uses virtual addresses.
      */
-    VAddr PopStaticBuffer(size_t* data_size = nullptr, bool useStaticBuffersToGetVaddr = false);
+    [[deprecated]] VAddr PopStaticBuffer(size_t* data_size);
+
+    /**
+     * @brief Pops a static buffer from the IPC request buffer.
+     * @return The buffer that was copied from the IPC request originator.
+     *
+     * In real services, static buffers must be set up before any IPC request using those is sent.
+     * It is the duty of the process (usually services) to allocate and set up the receiving static
+     * buffer information. Our HLE services do not need to set up the buffers beforehand.
+     */
+    const std::vector<u8>& PopStaticBuffer();
 
     /**
      * @brief Pops the mapped buffer vaddr
@@ -451,21 +469,21 @@ inline std::tuple<Kernel::SharedPtr<T>...> RequestParser::PopObjects() {
                                           std::index_sequence_for<T...>{});
 }
 
-inline VAddr RequestParser::PopStaticBuffer(size_t* data_size, bool useStaticBuffersToGetVaddr) {
+inline VAddr RequestParser::PopStaticBuffer(size_t* data_size) {
     const u32 sbuffer_descriptor = Pop<u32>();
     StaticBufferDescInfo bufferInfo{sbuffer_descriptor};
     if (data_size != nullptr)
         *data_size = bufferInfo.size;
-    if (!useStaticBuffersToGetVaddr)
-        return Pop<VAddr>();
-    else {
-        ASSERT_MSG(0, "remove the assert if multiprocess/IPC translation are implemented.");
-        // The buffer has already been copied to the static buffer by the kernel during
-        // translation
-        Pop<VAddr>(); // Pop the calling process buffer address
-                      // and get the vaddr from the static buffers
-        return cmdbuf[(0x100 >> 2) + bufferInfo.buffer_id * 2 + 1];
-    }
+    return Pop<VAddr>();
+}
+
+inline const std::vector<u8>& RequestParser::PopStaticBuffer() {
+    const u32 sbuffer_descriptor = Pop<u32>();
+    // Pop the address from the incoming request buffer
+    Pop<VAddr>();
+
+    StaticBufferDescInfo buffer_info{sbuffer_descriptor};
+    return context->GetStaticBuffer(buffer_info.buffer_id);
 }
 
 inline VAddr RequestParser::PopMappedBuffer(size_t* data_size,

src/core/hle/kernel/hle_ipc.cpp

@@ -2,6 +2,7 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#include <vector>
 #include <boost/range/algorithm_ext/erase.hpp>
 #include "common/assert.h"
 #include "common/common_types.h"
@@ -44,6 +45,16 @@ void HLERequestContext::ClearIncomingObjects() {
     request_handles.clear();
 }
 
+const std::vector<u8>& HLERequestContext::GetStaticBuffer(u8 buffer_id) const {
+    ASSERT_MSG(!static_buffers[buffer_id].empty(), "Empty static buffer!");
+    return static_buffers[buffer_id];
+}
+
+void HLERequestContext::AddStaticBuffer(u8 buffer_id, std::vector<u8> data) {
+    ASSERT(static_buffers[buffer_id].empty() && !data.empty());
+    static_buffers[buffer_id] = std::move(data);
+}
+
 ResultCode HLERequestContext::PopulateFromIncomingCommandBuffer(const u32_le* src_cmdbuf,
                                                                 Process& src_process,
                                                                 HandleTable& src_table) {
@@ -84,6 +95,18 @@ ResultCode HLERequestContext::PopulateFromIncomingCommandBuffer(const u32_le* sr
             cmd_buf[i++] = src_process.process_id;
             break;
         }
+        case IPC::DescriptorType::StaticBuffer: {
+            VAddr source_address = src_cmdbuf[i];
+            IPC::StaticBufferDescInfo buffer_info{descriptor};
+
+            // Copy the input buffer into our own vector and store it.
+            std::vector<u8> data(buffer_info.size);
+            Memory::ReadBlock(src_process, source_address, data.data(), data.size());
+
+            AddStaticBuffer(buffer_info.buffer_id, std::move(data));
+            cmd_buf[i++] = source_address;
+            break;
+        }
         default:
             UNIMPLEMENTED_MSG("Unsupported handle translation: 0x%08X", descriptor);
         }
@@ -124,6 +147,25 @@ ResultCode HLERequestContext::WriteToOutgoingCommandBuffer(u32_le* dst_cmdbuf, P
             }
             break;
         }
+        case IPC::DescriptorType::StaticBuffer: {
+            IPC::StaticBufferDescInfo buffer_info{descriptor};
+
+            const auto& data = GetStaticBuffer(buffer_info.buffer_id);
+
+            // Grab the address that the target thread set up to receive the response static buffer
+            // and write our data there. The static buffers area is located right after the command
+            // buffer area.
+            size_t static_buffer_offset = IPC::COMMAND_BUFFER_LENGTH + 2 * buffer_info.buffer_id;
+            IPC::StaticBufferDescInfo target_descriptor{dst_cmdbuf[static_buffer_offset]};
+            VAddr target_address = dst_cmdbuf[static_buffer_offset + 1];
+
+            ASSERT_MSG(target_descriptor.size >= data.size(), "Static buffer data is too big");
+
+            Memory::WriteBlock(dst_process, target_address, data.data(), data.size());
+
+            dst_cmdbuf[i++] = target_address;
+            break;
+        }
         default:
             UNIMPLEMENTED_MSG("Unsupported handle translation: 0x%08X", descriptor);
         }

src/core/hle/kernel/hle_ipc.h

@@ -119,6 +119,18 @@ public:
      */
     void ClearIncomingObjects();
 
+    /**
+     * Retrieves the static buffer identified by the input buffer_id. The static buffer *must* have
+     * been created in PopulateFromIncomingCommandBuffer by way of an input StaticBuffer descriptor.
+     */
+    const std::vector<u8>& GetStaticBuffer(u8 buffer_id) const;
+
+    /**
+     * Sets up a static buffer that will be copied to the target process when the request is
+     * translated.
+     */
+    void AddStaticBuffer(u8 buffer_id, std::vector<u8> data);
+
     /// Populates this context with data from the requesting process/thread.
     ResultCode PopulateFromIncomingCommandBuffer(const u32_le* src_cmdbuf, Process& src_process,
                                                  HandleTable& src_table);
@@ -131,6 +143,8 @@ private:
     SharedPtr<ServerSession> session;
     // TODO(yuriks): Check common usage of this and optimize size accordingly
     boost::container::small_vector<SharedPtr<Object>, 8> request_handles;
+    // The static buffers will be created when the IPC request is translated.
+    std::array<std::vector<u8>, IPC::MAX_STATIC_BUFFERS> static_buffers;
 };
 
 } // namespace Kernel

src/core/hle/service/ac/ac.cpp

@@ -2,6 +2,7 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
+#include <vector>
 #include "common/common_types.h"
 #include "common/logging/log.h"
 #include "core/hle/ipc.h"
@@ -19,17 +20,12 @@ namespace AC {
 void Module::Interface::CreateDefaultConfig(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp(ctx, 0x1, 0, 0);
 
-    std::size_t desc_size;
-    VAddr ac_config_addr = rp.PeekStaticBuffer(0, &desc_size);
-
-    ASSERT_MSG(desc_size >= sizeof(Module::ACConfig),
-               "Output buffer size can't fit ACConfig structure");
-
-    Memory::WriteBlock(ac_config_addr, &ac->default_config, sizeof(ACConfig));
+    std::vector<u8> buffer(sizeof(ACConfig));
+    std::memcpy(buffer.data(), &ac->default_config, buffer.size());
 
     IPC::RequestBuilder rb = rp.MakeBuilder(1, 2);
     rb.Push(RESULT_SUCCESS);
-    rb.PushStaticBuffer(ac_config_addr, sizeof(ACConfig), 0);
+    rb.PushStaticBuffer(std::move(buffer), 0);
 
     LOG_WARNING(Service_AC, "(STUBBED) called");
 }
@@ -106,7 +102,7 @@ void Module::Interface::GetWifiStatus(Kernel::HLERequestContext& ctx) {
 
 void Module::Interface::GetInfraPriority(Kernel::HLERequestContext& ctx) {
     IPC::RequestParser rp(ctx, 0x27, 0, 2);
-    VAddr ac_config = rp.PopStaticBuffer();
+    const std::vector<u8>& ac_config = rp.PopStaticBuffer();
 
     IPC::RequestBuilder rb = rp.MakeBuilder(2, 0);
     rb.Push(RESULT_SUCCESS);
@@ -121,13 +117,13 @@ void Module::Interface::SetRequestEulaVersion(Kernel::HLERequestContext& ctx) {
     u32 major = rp.Pop<u8>();
     u32 minor = rp.Pop<u8>();
 
-    VAddr ac_config = rp.PopStaticBuffer();
+    const std::vector<u8>& ac_config = rp.PopStaticBuffer();
 
     // TODO(Subv): Copy over the input ACConfig to the stored ACConfig.
 
     IPC::RequestBuilder rb = rp.MakeBuilder(1, 2);
     rb.Push(RESULT_SUCCESS);
-    rb.PushStaticBuffer(ac_config, sizeof(ACConfig), 0);
+    rb.PushStaticBuffer(std::move(ac_config), 0);
 
     LOG_WARNING(Service_AC, "(STUBBED) called, major=%u, minor=%u", major, minor);
 }

src/core/hle/service/apt/apt.cpp

@@ -720,7 +720,7 @@ void AppletUtility(Service::Interface* self) {
     u32 utility_command = rp.Pop<u32>();
     u32 input_size = rp.Pop<u32>();
     u32 output_size = rp.Pop<u32>();
-    VAddr input_addr = rp.PopStaticBuffer();
+    VAddr input_addr = rp.PopStaticBuffer(nullptr);
 
     VAddr output_addr = rp.PeekStaticBuffer(0);
 
@@ -823,7 +823,7 @@ void StartLibraryApplet(Service::Interface* self) {
 
     size_t buffer_size = rp.Pop<u32>();
     Kernel::Handle handle = rp.PopHandle();
-    VAddr buffer_addr = rp.PopStaticBuffer();
+    VAddr buffer_addr = rp.PopStaticBuffer(nullptr);
 
     LOG_DEBUG(Service_APT, "called applet_id=%08X", static_cast<u32>(applet_id));
 

src/core/hle/service/frd/frd.cpp

@@ -113,7 +113,7 @@ void UnscrambleLocalFriendCode(Service::Interface* self) {
     IPC::RequestParser rp(Kernel::GetCommandBuffer(), 0x1C, 1, 2);
     const u32 friend_code_count = rp.Pop<u32>();
     size_t in_buffer_size;
-    const VAddr scrambled_friend_codes = rp.PopStaticBuffer(&in_buffer_size, false);
+    const VAddr scrambled_friend_codes = rp.PopStaticBuffer(&in_buffer_size);
     ASSERT_MSG(in_buffer_size == (friend_code_count * scrambled_friend_code_size),
                "Wrong input buffer size");
 

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

@@ -72,7 +72,7 @@ static void OpenFile(Service::Interface* self) {
     FileSys::Mode mode;
     mode.hex = rp.Pop<u32>();
     u32 attributes = rp.Pop<u32>(); // TODO(Link Mauve): do something with those attributes.
-    VAddr filename_ptr = rp.PopStaticBuffer();
+    VAddr filename_ptr = rp.PopStaticBuffer(nullptr);
     FileSys::Path file_path(filename_type, filename_size, filename_ptr);
 
     LOG_DEBUG(Service_FS, "path=%s, mode=%u attrs=%u", file_path.DebugStr().c_str(), mode.hex,

src/core/hle/service/ir/ir_user.cpp

@@ -433,7 +433,7 @@ static void FinalizeIrNop(Interface* self) {
 static void SendIrNop(Interface* self) {
     IPC::RequestParser rp(Kernel::GetCommandBuffer(), 0x0D, 1, 2);
     const u32 size = rp.Pop<u32>();
-    const VAddr address = rp.PopStaticBuffer();
+    const VAddr address = rp.PopStaticBuffer(nullptr);
 
     std::vector<u8> buffer(size);
     Memory::ReadBlock(address, buffer.data(), size);

src/core/hle/service/nwm/nwm_uds.cpp

@@ -771,9 +771,9 @@ static void BeginHostingNetwork(Interface* self) {
     const u32 passphrase_size = rp.Pop<u32>();
 
     size_t desc_size;
-    const VAddr network_info_address = rp.PopStaticBuffer(&desc_size, false);
+    const VAddr network_info_address = rp.PopStaticBuffer(&desc_size);
     ASSERT(desc_size == sizeof(NetworkInfo));
-    const VAddr passphrase_address = rp.PopStaticBuffer(&desc_size, false);
+    const VAddr passphrase_address = rp.PopStaticBuffer(&desc_size);
     ASSERT(desc_size == passphrase_size);
 
     // TODO(Subv): Store the passphrase and verify it when attempting a connection.
@@ -907,7 +907,7 @@ static void SendTo(Interface* self) {
     u32 flags = rp.Pop<u32>();
 
     size_t desc_size;
-    const VAddr input_address = rp.PopStaticBuffer(&desc_size, false);
+    const VAddr input_address = rp.PopStaticBuffer(&desc_size);
     ASSERT(desc_size >= data_size);
 
     IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
@@ -1093,7 +1093,7 @@ static void SetApplicationData(Interface* self) {
     u32 size = rp.Pop<u32>();
 
     size_t desc_size;
-    const VAddr address = rp.PopStaticBuffer(&desc_size, false);
+    const VAddr address = rp.PopStaticBuffer(&desc_size);
     ASSERT(desc_size == size);
 
     LOG_DEBUG(Service_NWM, "called");

src/tests/core/hle/kernel/hle_ipc.cpp

@@ -116,25 +116,58 @@ TEST_CASE("HLERequestContext::PopulateFromIncomingCommandBuffer", "[core][kernel
         REQUIRE(context.CommandBuffer()[2] == process->process_id);
     }
 
+    SECTION("translates StaticBuffer descriptors") {
+        auto buffer = std::make_shared<std::vector<u8>>(Memory::PAGE_SIZE);
+        std::fill(buffer->begin(), buffer->end(), 0xAB);
+
+        VAddr target_address = 0x10000000;
+        auto result = process->vm_manager.MapMemoryBlock(target_address, buffer, 0, buffer->size(),
+                                                         MemoryState::Private);
+        REQUIRE(result.Code() == RESULT_SUCCESS);
+
+        const u32_le input[]{
+            IPC::MakeHeader(0, 0, 2), IPC::StaticBufferDesc(buffer->size(), 0), target_address,
+        };
+
+        context.PopulateFromIncomingCommandBuffer(input, *process, handle_table);
+
+        CHECK(context.GetStaticBuffer(0) == *buffer);
+
+        REQUIRE(process->vm_manager.UnmapRange(target_address, buffer->size()) == RESULT_SUCCESS);
+    }
+
     SECTION("translates mixed params") {
+        auto buffer = std::make_shared<std::vector<u8>>(Memory::PAGE_SIZE);
+        std::fill(buffer->begin(), buffer->end(), 0xCE);
+
+        VAddr target_address = 0x10000000;
+        auto result = process->vm_manager.MapMemoryBlock(target_address, buffer, 0, buffer->size(),
+                                                         MemoryState::Private);
+        REQUIRE(result.Code() == RESULT_SUCCESS);
+
         auto a = MakeObject();
         const u32_le input[]{
-            IPC::MakeHeader(0, 2, 4),
+            IPC::MakeHeader(0, 2, 6),
             0x12345678,
             0xABCDEF00,
             IPC::MoveHandleDesc(1),
             handle_table.Create(a).Unwrap(),
             IPC::CallingPidDesc(),
             0,
+            IPC::StaticBufferDesc(buffer->size(), 0),
+            target_address,
         };
 
         context.PopulateFromIncomingCommandBuffer(input, *process, handle_table);
 
         auto* output = context.CommandBuffer();
-        REQUIRE(output[1] == 0x12345678);
-        REQUIRE(output[2] == 0xABCDEF00);
-        REQUIRE(context.GetIncomingHandle(output[4]) == a);
-        REQUIRE(output[6] == process->process_id);
+        CHECK(output[1] == 0x12345678);
+        CHECK(output[2] == 0xABCDEF00);
+        CHECK(context.GetIncomingHandle(output[4]) == a);
+        CHECK(output[6] == process->process_id);
+        CHECK(context.GetStaticBuffer(0) == *buffer);
+
+        REQUIRE(process->vm_manager.UnmapRange(target_address, buffer->size()) == RESULT_SUCCESS);
     }
 }
 
@@ -211,6 +244,37 @@ TEST_CASE("HLERequestContext::WriteToOutgoingCommandBuffer", "[core][kernel]") {
         REQUIRE(handle_table.GetGeneric(output[3]) == b);
         REQUIRE(handle_table.GetGeneric(output[5]) == c);
     }
+
+    SECTION("translates StaticBuffer descriptors") {
+        std::vector<u8> input_buffer(Memory::PAGE_SIZE);
+        std::fill(input_buffer.begin(), input_buffer.end(), 0xAB);
+
+        context.AddStaticBuffer(0, input_buffer);
+
+        auto output_buffer = std::make_shared<std::vector<u8>>(Memory::PAGE_SIZE);
+        VAddr target_address = 0x10000000;
+        auto result = process->vm_manager.MapMemoryBlock(
+            target_address, output_buffer, 0, output_buffer->size(), MemoryState::Private);
+        REQUIRE(result.Code() == RESULT_SUCCESS);
+
+        input[0] = IPC::MakeHeader(0, 0, 2);
+        input[1] = IPC::StaticBufferDesc(input_buffer.size(), 0);
+        input[2] = target_address;
+
+        // An entire command buffer plus enough space for one static buffer descriptor and its
+        // target address
+        std::array<u32_le, IPC::COMMAND_BUFFER_LENGTH + 2> output_cmdbuff;
+        // Set up the output StaticBuffer
+        output_cmdbuff[IPC::COMMAND_BUFFER_LENGTH] =
+            IPC::StaticBufferDesc(output_buffer->size(), 0);
+        output_cmdbuff[IPC::COMMAND_BUFFER_LENGTH + 1] = target_address;
+
+        context.WriteToOutgoingCommandBuffer(output_cmdbuff.data(), *process, handle_table);
+
+        CHECK(*output_buffer == input_buffer);
+        REQUIRE(process->vm_manager.UnmapRange(target_address, output_buffer->size()) ==
+                RESULT_SUCCESS);
+    }
 }
 
 } // namespace Kernel