Data processing system having re-entrant function for subroutine

Details Data processing system having re-entrant function for subroutine Data processing system having re-entrant function for subroutine

1981-09-22

1984-07-10

Smith, Jerry

Boots, shoes, and leggings

G06F 918, G06F 1300

Patent

active

044596570

ABSTRACT:
A data processing system is disclosed which includes a memory having a plurality of addressable register banks and for memory areas for performing a re-entrant function of a subroutine. The memory areas store a start address of an interrupt program, a program status word of the interrupt program, and a register bank pointer code to be used by the interrupt program. The memory has a program counter, a program status word, and a register bank pointer. When an interrupt request is received, the contents of a program counter, the program status word, and the register bank pointer are swapped with the contents of a particular memory area group. Further, by swapping the contents of the program counter with the contents of the register in the register bank which contains in advance the start address of the subroutine to be used, the re-entrant operation of the subroutine may be accomplished.

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TMS 9900 Microprocessor Data Manual; Oct. 1976; pp. 3-7, published by Texas Instruments, Inc.

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