return frame_id_build (frame_unwind_register_signed (next_frame, NUM_REGS + SP_REGNUM),
return frame_id_build (frame_unwind_register_signed (next_frame, NUM_REGS + MIPS_SP_REGNUM),
mips_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame){  return frame_id_build (frame_unwind_register_signed (next_frame, NUM_REGS + SP_REGNUM),			 frame_pc_unwind (next_frame));}