service: hle: Allow to access read buffer A and X directly

src/core/hle/service/acc/acc.cpp

@@ -400,10 +400,10 @@ protected:
         IPC::RequestParser rp{ctx};
         const auto base = rp.PopRaw<ProfileBase>();
 
-        const auto user_data = ctx.ReadBuffer();
+        const auto image_data = ctx.ReadBufferA(0);
-        const auto image_data = ctx.ReadBuffer(1);
+        const auto user_data = ctx.ReadBufferX(0);
 
-        LOG_DEBUG(Service_ACC, "called, username='{}', timestamp={:016X}, uuid=0x{}",
+        LOG_INFO(Service_ACC, "called, username='{}', timestamp={:016X}, uuid=0x{}",
                  Common::StringFromFixedZeroTerminatedBuffer(
                      reinterpret_cast<const char*>(base.username.data()), base.username.size()),
                  base.timestamp, base.user_uuid.RawString());

src/core/hle/service/hle_ipc.cpp

@@ -23,6 +23,17 @@
 #include "core/hle/service/ipc_helpers.h"
 #include "core/memory.h"
 
+namespace {
+static thread_local std::array read_buffer_data_a{
+    Common::ScratchBuffer<u8>(),
+    Common::ScratchBuffer<u8>(),
+};
+static thread_local std::array read_buffer_data_x{
+    Common::ScratchBuffer<u8>(),
+    Common::ScratchBuffer<u8>(),
+};
+} // Anonymous namespace
+
 namespace Service {
 
 SessionRequestHandler::SessionRequestHandler(Kernel::KernelCore& kernel_, const char* service_name_)
@@ -328,26 +339,57 @@ std::vector<u8> HLERequestContext::ReadBufferCopy(std::size_t buffer_index) cons
     }
 }
 
+std::span<const u8> HLERequestContext::ReadBufferA(std::size_t buffer_index) const {
+    static thread_local std::array read_buffer_a{
+        Core::Memory::CpuGuestMemory<u8, Core::Memory::GuestMemoryFlags::SafeRead>(memory, 0, 0),
+        Core::Memory::CpuGuestMemory<u8, Core::Memory::GuestMemoryFlags::SafeRead>(memory, 0, 0),
+    };
+
+    ASSERT_OR_EXECUTE_MSG(
+        BufferDescriptorA().size() > buffer_index, { return {}; },
+        "BufferDescriptorA invalid buffer_index {}", buffer_index);
+    auto& read_buffer = read_buffer_a[buffer_index];
+    return read_buffer.Read(BufferDescriptorA()[buffer_index].Address(),
+                            BufferDescriptorA()[buffer_index].Size(),
+                            &read_buffer_data_a[buffer_index]);
+}
+
+std::span<const u8> HLERequestContext::ReadBufferX(std::size_t buffer_index) const {
+    static thread_local std::array read_buffer_x{
+        Core::Memory::CpuGuestMemory<u8, Core::Memory::GuestMemoryFlags::SafeRead>(memory, 0, 0),
+        Core::Memory::CpuGuestMemory<u8, Core::Memory::GuestMemoryFlags::SafeRead>(memory, 0, 0),
+    };
+
+    ASSERT_OR_EXECUTE_MSG(
+        BufferDescriptorX().size() > buffer_index, { return {}; },
+        "BufferDescriptorX invalid buffer_index {}", buffer_index);
+    auto& read_buffer = read_buffer_x[buffer_index];
+    return read_buffer.Read(BufferDescriptorX()[buffer_index].Address(),
+                            BufferDescriptorX()[buffer_index].Size(),
+                            &read_buffer_data_x[buffer_index]);
+}
+
 std::span<const u8> HLERequestContext::ReadBuffer(std::size_t buffer_index) const {
     static thread_local std::array read_buffer_a{
         Core::Memory::CpuGuestMemory<u8, Core::Memory::GuestMemoryFlags::SafeRead>(memory, 0, 0),
         Core::Memory::CpuGuestMemory<u8, Core::Memory::GuestMemoryFlags::SafeRead>(memory, 0, 0),
     };
-    static thread_local std::array read_buffer_data_a{
-        Common::ScratchBuffer<u8>(),
-        Common::ScratchBuffer<u8>(),
-    };
     static thread_local std::array read_buffer_x{
         Core::Memory::CpuGuestMemory<u8, Core::Memory::GuestMemoryFlags::SafeRead>(memory, 0, 0),
         Core::Memory::CpuGuestMemory<u8, Core::Memory::GuestMemoryFlags::SafeRead>(memory, 0, 0),
     };
-    static thread_local std::array read_buffer_data_x{
-        Common::ScratchBuffer<u8>(),
-        Common::ScratchBuffer<u8>(),
-    };
 
     const bool is_buffer_a{BufferDescriptorA().size() > buffer_index &&
                            BufferDescriptorA()[buffer_index].Size()};
+    const bool is_buffer_x{BufferDescriptorX().size() > buffer_index &&
+                           BufferDescriptorX()[buffer_index].Size()};
+
+    if (is_buffer_a && is_buffer_x) {
+        LOG_WARNING(Input, "Both buffer descriptors are available a.size={}, x.size={}",
+                    BufferDescriptorA()[buffer_index].Size(),
+                    BufferDescriptorX()[buffer_index].Size());
+    }
+
     if (is_buffer_a) {
         ASSERT_OR_EXECUTE_MSG(
             BufferDescriptorA().size() > buffer_index, { return {}; },

src/core/hle/service/hle_ipc.h

@@ -253,6 +253,12 @@ public:
         return domain_message_header.has_value();
     }
 
+    /// Helper function to get a span of a buffer using the buffer descriptor A
+    [[nodiscard]] std::span<const u8> ReadBufferA(std::size_t buffer_index = 0) const;
+
+    /// Helper function to get a span of a buffer using the buffer descriptor X
+    [[nodiscard]] std::span<const u8> ReadBufferX(std::size_t buffer_index = 0) const;
+
     /// Helper function to get a span of a buffer using the appropriate buffer descriptor
     [[nodiscard]] std::span<const u8> ReadBuffer(std::size_t buffer_index = 0) const;
 

src/core/hle/service/prepo/prepo.cpp

@@ -58,14 +58,8 @@ private:
         IPC::RequestParser rp{ctx};
         const auto process_id = rp.PopRaw<u64>();
 
-        const auto data1 = ctx.ReadBuffer(0);
+        const auto data1 = ctx.ReadBufferA(0);
-        const auto data2 = [&ctx] {
+        const auto data2 = ctx.ReadBufferX(0);
-            if (ctx.CanReadBuffer(1)) {
-                return ctx.ReadBuffer(1);
-            }
-
-            return std::span<const u8>{};
-        }();
 
         LOG_DEBUG(Service_PREPO,
                   "called, type={:02X}, process_id={:016X}, data1_size={:016X}, data2_size={:016X}",
@@ -85,14 +79,8 @@ private:
         const auto user_id = rp.PopRaw<u128>();
         const auto process_id = rp.PopRaw<u64>();
 
-        const auto data1 = ctx.ReadBuffer(0);
+        const auto data1 = ctx.ReadBufferA(0);
-        const auto data2 = [&ctx] {
+        const auto data2 = ctx.ReadBufferX(0);
-            if (ctx.CanReadBuffer(1)) {
-                return ctx.ReadBuffer(1);
-            }
-
-            return std::span<const u8>{};
-        }();
 
         LOG_DEBUG(Service_PREPO,
                   "called, type={:02X}, user_id={:016X}{:016X}, process_id={:016X}, "
@@ -137,14 +125,8 @@ private:
         IPC::RequestParser rp{ctx};
         const auto title_id = rp.PopRaw<u64>();
 
-        const auto data1 = ctx.ReadBuffer(0);
+        const auto data1 = ctx.ReadBufferA(0);
-        const auto data2 = [&ctx] {
+        const auto data2 = ctx.ReadBufferX(0);
-            if (ctx.CanReadBuffer(1)) {
-                return ctx.ReadBuffer(1);
-            }
-
-            return std::span<const u8>{};
-        }();
 
         LOG_DEBUG(Service_PREPO, "called, title_id={:016X}, data1_size={:016X}, data2_size={:016X}",
                   title_id, data1.size(), data2.size());
@@ -161,14 +143,8 @@ private:
         const auto user_id = rp.PopRaw<u128>();
         const auto title_id = rp.PopRaw<u64>();
 
-        const auto data1 = ctx.ReadBuffer(0);
+        const auto data1 = ctx.ReadBufferA(0);
-        const auto data2 = [&ctx] {
+        const auto data2 = ctx.ReadBufferX(0);
-            if (ctx.CanReadBuffer(1)) {
-                return ctx.ReadBuffer(1);
-            }
-
-            return std::span<const u8>{};
-        }();
 
         LOG_DEBUG(Service_PREPO,
                   "called, user_id={:016X}{:016X}, title_id={:016X}, data1_size={:016X}, "