mov SFR_BANK_TO_SELECT_ON_NEXT_LCALL, #0x03; pushes target bank
                                ; on top of seperate stack
                                ; lock IRQ for 1 instruction?
                                ; (as if IRQ enable is touched?)
                                ; 
    lcall my_func_in_bank3      ; pushing address on stack and
                                ; current bank on a separate 
                                ; (32/64 byte deep) stack