* config/rx/rx.opt (mpid): Define.
	* config/rx/t-rx (MULTILIB_OPTIONS): Add -mpid
	(MULTILIB_DIRNAMES): Add pid.
	* config/rx/rx.c (rx_gp_base_regnum_val, rx_pid_base_regnum_val)
	(rx_num_interrupt_regs): New variable.
	(rx_gp_base_regnum): New function.  Returns the number of the
	small data area register.
	(rx_pid_base_regnum): New function.  Returns the number of the pid
	base register.
	(rx_decl_for_addr): New function.  Returns the symbolic part of a
	MEM.
	(rx_pid_data_operand): New function.  Returns whether an object is
	in the position independent data area.
	(rx_legitimize_address): New function.  Puts undecided PID
	objects in the PID data area.
	(rx_is_legitimate_address): Add support for PID operands.
	(rx_print_operand_address): Likewise.
	(rx_print_operand): Likewise.
	(rx_maybe_pidify_operand): New function.  Determine if an operand
	is suitable for PID addressing.
	(rx_gen_move_template): Add PID support.
	(rx_conditional_register_usage): Likewise.
	(rx_option_override): Initialise rx_num_interrupt_regs.
	(rx_is_legitimate_constant): Add support for PID constants.
	(TARGET_LEGITIMIZE_ADDRESS): Define.
	* config/rx/constraints.md (Rpid): Define.
	(Rpda): Define.
	* config/rx/rx.md (UNSPEC_PID_ADDR): Define.
	(tablejump): Add PID support.
	(mov<>): Likewise.
	(mov<>_internal): Likewise.
	(addsi3): Convert to an expander.  Add PID support.
	(pid_addr): New pattern.
	* config/rx/rx.h (CPP_SPEC): Define.
	(ASM_SPEC): Pass -mpid and -mint-register on to assembler.
	(CASE_VECTOR_PC_RELATIVE): Define.
	(JUMP_TABLES_IN_TEXT_SECTION): Enable for PID mode.
	* config/rx/rx-protos.h (rx_maybe_pidify_operand): Prototype.
	* doc/invoke.texi (RX Options): Document -mpid command line
	option.

Co-Authored-By: Nick Clifton <nickc@redhat.com>

From-SVN: r179558