* ppc-linux-nat.c (PTRACE_GET_DEBUGREG, PTRACE_SET_DEBUGREG,

	* ppc-linux-nat.c (PTRACE_GET_DEBUGREG, PTRACE_SET_DEBUGREG,
	PTRACE_GETSIGINFO): Define.
	(last_stopped_data_address): New.
	(ppc_linux_check_watch_resources): New function.
	(ppc_linux_region_ok_for_hw_watchpoint): New function.
	(ppc_linux_insert_watchpoint): New function.
	(ppc_linux_remove_watchpoint): New function.
	(ppc_linux_stopped_data_address): New function.
	(ppc_linux_stopped_by_watchpoint): New function.
	(_initialize_ppc_linux_nat): Set the above hardware watchpoint
	related target vectors.
	* rs6000-tdep.c (rs6000_gdbarch_init): Set PPC architectures
	to have nonsteppable watchpoint.
	* target.c (default_region_ok_for_hw_watchpoint,
	debug_to_region_ok_for_hw_watchpoint): New prototypes.
	(update_current_target): Inherit to_region_ok_for_hw_watchpoint
	and set default to_region_ok_for_hw_watchpoint.
	(default_region_ok_for_hw_watchpoint): New function.
	(debug_to_region_ok_for_hw_watchpoint): New function.
	(setup_target_debug): Set to_region_ok_for_hw_watchpoint of
	debug_target.
	* target.h (struct target_ops): Add a new target vector
	to_region_ok_for_hw_watchpoint.
	(TARGET_REGION_OK_FOR_HW_WATCHPOINT): Define this if it is not
	defined anyplace else.