hle_ipc: Use thread_local ReadBuffer

src/core/hle/kernel/hle_ipc.cpp

@@ -11,6 +11,7 @@
 #include "common/common_funcs.h"
 #include "common/common_types.h"
 #include "common/logging/log.h"
+#include "common/scratch_buffer.h"
 #include "core/hle/ipc_helpers.h"
 #include "core/hle/kernel/hle_ipc.h"
 #include "core/hle/kernel/k_auto_object.h"
@@ -346,20 +347,29 @@ std::vector<u8> HLERequestContext::ReadBufferCopy(std::size_t buffer_index) cons
 }
 
 std::span<const u8> HLERequestContext::ReadBuffer(std::size_t buffer_index) const {
+    static thread_local std::array<Common::ScratchBuffer<u8>, 2> read_buffer_a;
+    static thread_local std::array<Common::ScratchBuffer<u8>, 2> read_buffer_x;
+
     const bool is_buffer_a{BufferDescriptorA().size() > buffer_index &&
                            BufferDescriptorA()[buffer_index].Size()};
     if (is_buffer_a) {
         ASSERT_OR_EXECUTE_MSG(
             BufferDescriptorA().size() > buffer_index, { return {}; },
             "BufferDescriptorA invalid buffer_index {}", buffer_index);
-        const u8* const mem_ptr = memory.GetPointer(BufferDescriptorA()[buffer_index].Address());
-        return std::span<const u8>(mem_ptr, BufferDescriptorA()[buffer_index].Size());
+        auto& read_buffer = read_buffer_a[buffer_index];
+        read_buffer.resize_destructive(BufferDescriptorA()[buffer_index].Size());
+        memory.ReadBlock(BufferDescriptorA()[buffer_index].Address(), read_buffer.data(),
+                         read_buffer.size());
+        return read_buffer;
     } else {
         ASSERT_OR_EXECUTE_MSG(
             BufferDescriptorX().size() > buffer_index, { return {}; },
             "BufferDescriptorX invalid buffer_index {}", buffer_index);
-        const u8* const mem_ptr = memory.GetPointer(BufferDescriptorX()[buffer_index].Address());
-        return std::span<const u8>(mem_ptr, BufferDescriptorX()[buffer_index].Size());
+        auto& read_buffer = read_buffer_x[buffer_index];
+        read_buffer.resize_destructive(BufferDescriptorX()[buffer_index].Size());
+        memory.ReadBlock(BufferDescriptorX()[buffer_index].Address(), read_buffer.data(),
+                         read_buffer.size());
+        return read_buffer;
     }
 }