JPS63155236A - Detecting method for runaway of software - Google Patents

Abstract

PURPOSE:To allow an operator to easily detect the runaway of software and handle it by writing an instruction for starting processing at the time of abnormality occurrence in the entire area in a memory space. CONSTITUTION:A jump instruction for branching unconditionally to an address where the instruction for the program abnormality processing is stored is stored in an address 0038H. A restart instruction 'RST7' is stored in the entire free part 3 in a program area P. If a runaway of software is caused by a noise, etc., and the processing moves to the free part 3 of the program area P, the instruction RST7 is executed. The control is therefore moved to the restart address 0038H. Consequently, the execution of the program moves from the address 0038H to the area 4 where the program for abnormality processing, which is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a software runaway detection method.

[Prior Art and its Problems] Conventionally, during the operation of a computer, various factors such as noise can cause the software to run out of control, making it difficult to control the computer by the CPU. Moreover, as a result of the program running out of control, the program may end up running somewhere else, and the process may not finish.
There is a problem in that the processing moves to an unused part of the program area and program execution stalls, making it impossible to determine whether the program is being executed properly or not, making it difficult for the computer operator to recognize when the software is running out of control. Ta.

[Objective] Therefore, the present invention provides a software runaway detection method that eliminates such problems, reliably detects software runaway, and allows an operator to easily recognize and deal with it. The purpose is to

Means for Solving Problem E] Therefore, the present invention is characterized in that an instruction for starting processing in the event of an abnormality is written in all unused free areas in the program area in the memory space. .

[Operation] According to the above configuration, when the software goes out of control and moves to the program execution or empty area of the program, the abnormality processing is activated.

[Example] Hereinafter, the present invention will be described in detail based on two embodiments shown in the drawings.

In this embodiment, Intel's 8085 CPU is used as the CPU.
, or the so-called 80 series, such as Ziroku's Z-80, will be explained.

FIG. 1 is a block diagram showing an example of the configuration of a computer system to which the present invention can be applied. Here, -6, 7 and 8 are data bus, address bus and control bus respectively, 9 is 80 series CPt1, 10 is memory for storing programs and data, 11 is input device such as keyboard, 12 is display It is an output device such as a device.

In such a configuration, if the data bus 6 or the address bus 7 is affected by noise or the like, for example, the data or addresses change, and the destination address or return address added to the God's command developed in the storage area of the memory IO changes. It will be rewritten and execution will be moved to another location. Therefore, in this example, the storage area is configured as follows.

FIG. 2 is a memory map showing an example of the contents of the memory 10 in one embodiment of the present invention.

In FIG. 2, P is a program area, and l is a program developed in the program area P to be executed by the CPU 10 that controls the computer system. 2 indicates the address 0038+1 (“H” indicates a hexadecimal number. The following is the rest) address and its data, and the execution of the program is unconditionally branched to the address storing the instruction to handle the program abnormality described later. If the program uses interrupts, an interrupt disabling instruction DI is placed at address 00388, and then a jump instruction is placed to proceed to the address where abnormality processing is to be performed.

3 indicates an empty part of the program area P, and in this embodiment, the restart command "R" is applied to all of this part.
5T7" (FFH in object code) is stored. 4 is the area where the program that performs abnormality processing is stored, and 5
is the data memory area.

Here, if a runaway occurs in the software due to the influence of noise, etc., and the processing moves to the empty part 3 of the program area P, that is, the R5T7 instruction will be executed, so the control will always go to address 0038H, which is the restart address. will move.

As a result, execution of the program moves from address 003811 to area 4 where a program for performing abnormality processing is stored, and predetermined abnormality processing is performed.

To handle this abnormality, for example, clear all human output,
Depending on the system, the lamp may be turned off during operation to stop (hold) the CPU.

Further, depending on the form of the output device 12, a display warning or a sound warning may be given. By performing such abnormality processing, the system operator can easily and quickly recognize that the software has run three times, and can take appropriate measures.

[Effects of the Invention] As is clear from the above explanation, according to the present invention, when the software runs out of control and the execution of the program shifts to an empty area of the program, abnormality processing is activated. This makes it possible to detect with a very high probability when the software runs out of control.Furthermore, by handling the abnormality, the operator can easily recognize that the software has runaway, and therefore This will allow you to take immediate action in the future.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a computer configuration, and FIG. 2 is a memory map in an embodiment of the present invention. 1... Program, 2... Contents of address 003811, 3... Program free area, 4... Program error processing area, 5... Data memory area, 6... Data bus, 7. ...address bus, 8...control bus, 9...cpu. 10...Memory, II...Human power device, 12...Output device. Figure 1 Actual Tt1g1 Mouth 3 Meters Lift Figure 2

Claims (1)

[Scope of Claims] 1) A software runaway detection method characterized by writing an instruction for starting processing in the event of an abnormality into all unused free areas in a program area in a memory space. 2) In the software runaway detection method as set forth in claim 1, an interrupt command that causes software imprinting is written in all of the free areas, and when the execution of the program moves to the free area, the interrupt A method for detecting software runaway, characterized by moving execution of a program to a predetermined address in the memory space defined by an instruction, and branching from the predetermined address to a program that executes processing at the time of the abnormality. 3) A software runaway detection method according to claim 1 or 2, wherein the interrupt instruction is a 1-byte instruction.