kernel: It builds

src/core/tls.h

@@ -12,7 +12,7 @@ class CodeGenerator;
 namespace Core {
 
 union DtvEntry {
-    size_t counter;
+    std::size_t counter;
     u8* pointer;
 };
 
@@ -33,4 +33,13 @@ void SetTcbBase(void* image_address);
 /// Retrieves Tcb structure for the calling thread.
 Tcb* GetTcbBase();
 
+/// Makes sure TLS is initialized for the thread before entering guest.
+void EnsureThreadInitialized();
+
+template <class ReturnType, class... FuncArgs, class... CallArgs>
+ReturnType ExecuteGuest(PS4_SYSV_ABI ReturnType (*func)(FuncArgs...), CallArgs&&... args) {
+    EnsureThreadInitialized();
+    return func(std::forward<CallArgs>(args)...);
+}
+
 } // namespace Core