3.1.4 Null Frame Procedure

A null frame procedure is a particularly simple, special case of a register frame procedure, in which:

• The entry return address register is R26 (ENTRY_RA = 26).
  
  
• The return address is not saved in any other register (SAVE_RA = ENTRY_RA).
  
  
• No stack space is allocated (SP_SET = 0 and FRAME_SIZE = 0).
  
  
• As a result of the above, the prologue requires no instructions (ENTRY_LENGTH = 0).
  
  
• There is no associated exception handler (HANDLER_ADDRESS = 0).

This special case of a register frame procedure is of interest because such procedures may not need an associated procedure descriptor.