Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
System for performing call and return operations










Image Number 4 for United States Patent #4454579.

An improved system for performing call and return operations in a computer system in which every call and return operation changes the program counter and the frame pointer but some call and return operations change other state. Included in the state which may change in the computer system of the present invention is addresses used in calculating other addresses, an identifier specifying which instruction set the processor is executing, and protection state which determines what data may be accessed during execution of a procedure. In the system, the state saved and restored in the call and return operations is divided into basic state saved and restored on every call and return and extended state saved and restored on only some calls and returns. The frame associated with an execution accordingly contains either saved basic state or saved basic state and saved extended state. The frame further contains a frame type item in each frame which specifies whether it contains only basic state or both basic and extended state. There are two call instructions and a single return instruction. The system responds to one call instruction, the neighborhood call instruction, by saving and setting only basic state; it responds to the other, the general call instruction, by saving and setting both basic state and extended state, and if necessary, saving and setting protection state. The processor responds to the single return instruction and the frame type specifier by restoring the state specified in the frame type specifier.








 
 
  Recently Added Patents
Hybrid fin field-effect transistor structures and related methods
Apparatus for restoring setting information of a board management controller from a backup memory before loading an OS when a system board is replaced
Performance apparatus and electronic musical instrument
Managing job execution
Light-emitting device package and method of manufacturing the same
Method of forming solderable side-surface terminals of quad no-lead frame (QFN) integrated circuit packages
Eyeglass component
  Randomly Featured Patents
Method for producing hollow body elements, hollow body element, component, follow-on composite tool for producing hollow body elements
Method for the secondary error correction of a multi-port network analyzer
Self-emulsifiable antifoams
Write driver circuit for driving a magnetic head
Array substrate for organic electroluminescent device
Electronic clinical thermometer
Sharing access to application located on a smart card for clients in parallel
Seat sliding apparatus for vehicle
Control device for a pivot integrated in a manifold
Protective device for securing the storage space in the interior of a vehicle