def _setup_arm_arch(self, arch_mode=None):
        """Set up ARM architecture.
        """
        if arch_mode is None:
            arch_mode = ARCH_ARM_MODE_THUMB

        self.name = "ARM"
        self.arch_info = ArmArchitectureInformation(arch_mode)
        self.disassembler = ArmDisassembler(architecture_mode=arch_mode)
        self.ir_translator = ArmTranslator(architecture_mode=arch_mode)
Set up ARM architecture.