* gdbarch.sh (read_sp): Remove.

	* gdbarch.sh (read_sp): Remove.
	* gdbarch.c, gdbarch.h: Regenerate.
	* frame.c (frame_sp_unwind): Do not call TARGET_READ_SP.

	* avr-tdep.c (avr_read_sp): Remove.
	(avr_unwind_sp): New function.
	(avr_gdbarch_init): Install unwind_sp instead of read_sp callback.
	* mips-tdep.c (mips_read_sp): Remove.
	(mips_unwind_sp): New function.
	(mips_gdbarch_init): Install unwind_sp instead of read_sp callback.
	* score-tdep.c (score_read_unsigned_register): Remove.
	(score_read_sp): Remove.
	(score_unwind_sp): New function.
	(score_gdbarch_init): Install unwind_sp instead of read_sp callback.