Stack control device and method

Abstract

Provided are a stack control device and method thereof used when a microcomputer or the like executes a program. The stack control device 10, when the interrupt controller 18 monitors the capacity of the H / W stack 26, and when it becomes the push and pop object capacity, push and pop interrupts occur respectively and the main control unit 12 is notified, and the main control unit 12 responds to the push interrupt , take out the data from the bottom of the H / W stack 26, push into the S / W stack 28, and repeat this operation as the push interrupt process according to the prescribed transfer number, respond to the pop-up interrupt, pop the data from the S / W stack 28 and store it in the H / At the bottom of the W stack 26, this operation is repeated as a pop-up interrupt process according to the specified return number, so that even if the program that may exceed the capacity of the stack register is executed, it can continue to execute without program stop and runaway phenomenon.

Description

technical field [0001] The present invention relates to a stack control device and its method used in the process of executing programs in a micro information processor or the like. Background technique [0002] Conventionally, in microcomputers, when the same program is executed many times, it is possible to execute an efficient program by using its processing part as a subroutine. After executing such a subroutine call instruction, the return address of the program to be processed after the subroutine is pushed into the stack, and then jump to the start address of the subroutine. After the processing of this subroutine is finished, execute the return instruction of the subroutine, extract the return address from the stack and jump to this address. [0003] In such a micro information processor, when executing program instructions, in order to push and pop to the stack at high speed, a stack register is set inside the hardware, and as the program is executed, the program c...

AI Technical Summary

Problems solved by technology

[0004] In addition, in the micro information processor, when the program is executed and the capacity of the stack is exceeded, there will be a problem that the program is out of control due to the unexpected stop of the program or the disappearance of the return address of the subroutine.

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