sp = get_frame_register_unsigned
(this_frame, gdbarch_tdep (gdbarch)->a0_base + 1);
cache->prev_sp = read_memory_integer (sp - 12, 4, byte_order);
sp = get_frame_register_unsigned
(this_frame, gdbarch_tdep (gdbarch)->a0_base + 1);
cache->prev_sp = read_memory_integer (sp - 12, 4, byte_order);