Function LinkAddressToGuestFunction

Source/Tools/LinuxEmulation/Thunks.cpp:412–421

* Instructs the Core to redirect calls to functions at the given * address to another function. The original callee address is passed * to the target function through an implicit argument stored in r11. * * For 32-bit the implicit argument is stored in the lower 32-bits of mm0. * * The primary use case of this is ensuring that host function pointers * returned from thunked API

   * returned from thunked APIs can safely be called by the guest.
   */
  void LinkAddressToGuestFunction(void* argsv) {
    struct args_t {
      uintptr_t original_callee;
      uintptr_t target_addr; // Guest function to call when branching to original_callee
    };

    auto args = reinterpret_cast<args_t*>(argsv);
    auto CTX = static_cast<FEXCore::Context::Context*>(ThreadObject->Thread->CTX);
    CTX->AddThunkTrampolineIRHandler(args->original_callee, args->target_addr);
  }

  /**
   * Guest-side helper to initiate creation of a host trampoline for