JPS6238951A - Discrimination system for microprogram loop - Google Patents

Abstract

PURPOSE:To discriminate whether a microprogram is looped or not by providing a micro instruction that starts up a timer at the entrance of a path where generally the micro instruction passes through and resets it at the exit, storing the content of a memory or a register at a prescribed memory area when the timer is time over and performing an abnormal interruption in a high-order program. CONSTITUTION:When a micro program is started, first of all, an input process part 1 is executed and next, a timer 3 is started up and next, a pre-process part 2 is executed and after that, either of process parts 7a-7d is executed. After the processes of the process parts, the timer 3 is reset by a passing check part 6 and after that, a termination process part 5 is executed. For example, the microprogram is looped at the process part 7a, the timer 3 is time over. By the time over of the timer, a logging part 4 is operated, thereby the content of the memory or the register being saved at a prescribed fixed area, and after that, the occurrence of abnormality is informed to the high-order program by the abnormal interruption.

Description

[Detailed Description of the Invention] [Summary] A microinstruction for activating a timer is provided at an entrance portion through which a microprogram normally passes; a microinstruction for resetting the timer is provided at an exit portion through which a microprogram normally passes; When a timeout occurs, the microprogram is provided with a microroutine that notifies the higher-level program of this fact through an interrupt and stores the contents of the memory and registers in a fixed area.

[Industrial application field]

The present invention relates to a microprogram loop determination method for determining whether a microprogram is looping.

[Prior art and problems]

In the prior art, if a microprogram loops, it cannot be determined, and the program remains in a sluggish state for a while before it is discovered that the program has looped.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a microprogram loop determination method that can minimize the loop state of the microprogram and facilitate restarting the microprogram and investigating failures.

[Means to achieve the purpose]

Therefore, the microprogram loop determination method of the present invention provides a microinstruction for activating a timer at an entrance through which the microprogram normally passes, and a microinstruction for resetting the timer at an exit through which the microprogram normally passes. The present invention is characterized in that a microroutine is provided in the microprogram to store the contents of the memory or register in a predetermined memory area and issue an abnormal interrupt to the higher-level program when the timer times out.

[Embodiments of the invention]

Hereinafter, the present invention will be explained with reference to the drawings. The figure is a diagram showing the configuration of one embodiment of the present invention. In the figure, 1 is an input processing section, 2 is a preprocessing section, 3 is a timer, 4 is a logging section, 5 is a final processing section, 6 is a passage check section, and 7a to 7
d indicates a processing section, 8 a basic control section, 9 a loop check section, and 10 a processing section. The basic control section 8 consists of sections 1 to 6, and includes a loop check section 9.
consists of sections 3, 4.6, and the processing section consists of sections 7a to 7d.

The machine language instructions of the higher-level program are executed by the microprogram. When the microprogram is started,
First, the input processing section 1 is executed, then the timer 3 is started, then the preprocessing section 2 is executed, and then one of the processing sections 7a to 7d is executed. After the processing by the processing section is performed, the timer 3 is reset by the il passage check 6, and then the finalization processing section 5 is executed. For example, when the microprogram loops in the processing section 7a, the timer 3 times out. When the timer 3 times out, the logging unit 4 operates, thereby saving the contents of the memory and registers in a predetermined fixed area, and then notifying the higher-level program of the occurrence of the abnormality by an abnormality interrupt.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is possible to promptly notify an operator etc. that the fat microprogram has looped, and to log information necessary for fault investigation such as memory contents and registers during the fbl loop. (Because C1 loops are identified, the time it takes to determine when a loop occurs is shortened, operators, etc. can be notified immediately, and recovery such as restarting the microprogram can be quickly performed.) It can be effective.

[Brief explanation of drawings]

The figure is a diagram showing the configuration of one embodiment of the present invention. ■...Human processing unit, 2...Preprocessing unit, 3...Timer, 4...Logging unit, 5...Final processing unit, 6...
... Passage check section, 7a to 7d... Processing section, 8
...Basic control part, 9...Loop check part,
10...Processing part.

Claims (1)

[Claims] A microinstruction to start a timer is provided at the entrance through which the microprogram normally passes, a microinstruction to reset the timer is provided at the exit through which the microprogram normally passes, and when the timer times out, the contents of the memory and registers are 1. A loop determination method for a microprogram, characterized in that a microroutine is provided in the microprogram for storing the code in a predetermined memory area and issuing an abnormal interrupt to a higher-level program.