JPS63226746A - Area reference event monitoring method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Table of contents] Overview Industrial field of application Prior art (Figures 4 and 5) Problems to be solved by the invention Means for solving the problems (Figure 1) Effect Examples (Figures 2 and 3) Effects of the invention [Summary] P E R (Prograta Event Reco
rding) allows the mechanism to monitor area reference events, thereby making it possible to detect programs that are illegally referencing areas.

(Industrial Application Field) The present invention relates to an area reference event monitoring method for monitoring events that refer to a specific area of a memory.

[Conventional technology]

In a data processing device, as the cause of area destruction where data is mistakenly updated in a certain area of memory, it is insufficient to check the destruction light program that wrote this erroneous data; It is necessary to check the reference source program that specified the area as the write destination.

For example, as shown in Figure 4, program A should write data in area SA of memory M, but program A mistakenly writes data in area SB and destroys area SB. Unless you check program B, which mistakenly instructed program A to write to area SH when it should have written to area SA,
It is not possible to accurately investigate the cause of area destruction failure.

By the way, conventional data processing devices do not perform program event recording (Program Event R).
A hardware called ``ecoding'' (hereinafter referred to as PER) mechanism is provided to monitor program branch instruction events, instruction read events, area content update events, general purpose register content update events, and the like.

In this case, as shown in FIG. 5, a control register for monitoring events is prepared in order to instruct the monitoring event of this PER mechanism, and bit 0 is allocated for instructing monitoring of branch instruction events, and bit 1 is assigned to the instruction to monitor the branch instruction event. Assigned for read event monitoring instructions,
Bit 2 is allocated for monitoring the area content update event,
Bit 3 is assigned to instruct monitoring of content update events of general-purpose registers. Bits 16 to 31 are also assigned as an update mask for the general-purpose register. Furthermore, bits 4 to 1
5 is reserved.

[Problem that the invention seeks to solve]

By the way, as mentioned above, the monitoring events of the conventional PER mechanism include area content update events, but no area reference events. Therefore, as explained with reference to FIG. 4, in the case of area destruction caused by program B erroneously instructing program A to the write destination, program A that caused the area destruction will be affected by the monitoring function based on content update events. P.E.
Although it was recognized and investigated using the R function, it was not possible to recognize and investigate Program B, which referred to the area that caused the problem.

Therefore, an object of the present invention is to provide an area reference event monitoring system that allows checking of a reference source program.

[Means for solving problems]

In order to achieve the above object, the present invention provides a control register section 1, a control section 2, and a PER processing section 3, as shown in FIG. Then, a register is prepared for instructing the control register unit 1 to specify an area range indicating the area to be investigated in the memory, and for instructing reference source monitoring to monitor the reference source program.

[Effect]

Therefore, when a reference is made to the specified area of the memory, the PER processing unit 3 recognizes the reference source program and investigates it. This is then reported to the control unit 2, and the control unit 2 collects and processes the necessary data.

〔Example〕

An embodiment of the present invention will be described in detail based on FIGS. 2 and 3.

FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 shows the function of the monitoring event control register in the present invention.

In FIG. 2, the same reference numerals as in FIG. 1 indicate the same parts, 4 is a program interrupt section, 5 is a data output section, 6 is an input section, 7 is a printer, 8 is a display section, and 10 is a central processing unit. (CPU), 11 is a memory.

The control register section 2 includes a monitoring event control register 24 to be described later, a starting address entry control register 25 in which the starting address of the memory 11 to be monitored for a reference event is written, and an end address of the memory 11 to be monitored for the reference event. An end address entry control register 26 is provided to be entered. Further, as shown in FIG. 3, the monitoring event control register 24 has bit 4 assigned to an instruction to monitor the reference event of the area.

The functions of the other bits of this monitor event control register 24 are the same as those in FIG. 5 above.

The control unit 1 is composed of a PER mechanism service processor, which includes a command decoding unit 21 that decodes commands, an operation control unit 22 that performs initialization processing for PER processing according to this command, and a dump collection processing function and internal programs. The data collection interrupt processing section 23 is provided with a trace processing function.

The PER processing unit 3 performs monitoring processing of events according to the data written in the monitoring event control register 24, and is provided with an address monitoring unit 27, which checks the address register of the memory 11 and performs processing in the above area. We monitor that references are made.

The program interrupt section 4 outputs a program interrupt to the control section 1 in response to a signal from the PER processing section 3.

The data output section 5 outputs the data collected by the control section 1 to a printer 7, a display section 8, or the like.

The input unit 6 is for inputting various commands, such as inputting a command "PER mechanism service command" prepared to make the PER mechanism effective and easy to use, and for outputting messages, for example. It consists of a keyboard.

Next, the operation of the present invention will be explained.

(1) First, the operator inputs a PER mechanism service command from the input section 6. At this time, the operands of this command include the start address and end address of the area to be monitored as an area reference event by the PER mechanism, and the processing to be executed when the monitoring area address is detected (dump information output, trace information output, etc.). ).

■ As a result, the command decoding unit 24 decodes this PER mechanism service command, recognizes that the area is reference event monitoring, and performs the initialization process of the environment necessary to operate the PER mechanism, that is, the PER processing unit 3. conduct. it is,
Set Bisotoe and 12 of PSW to "1" respectively,
In addition, bit 4 of the monitoring event control register 21 is turned on, and the start address and end address indicating the range of the memory 11 where the reference event is to be monitored are set in the start address entry control register 22 and end address entry control register 23, etc. Performs initialization processing.

■ After doing this, in data processing, memory 11
When the reference event occurs, the address monitoring section 27 of the PER processing section detects this and notifies the program interrupt section 4 of a program interrupt called a PER interrupt.

(2) The program interrupt section 4 accepts this PER interrupt and notifies the control section 1 of it.

(2) In the control unit 1, the data collection processing unit is operated thereby to perform dump collection processing, trace collection processing, and the like. As a result, other information necessary for investigation, such as PSW and registers when referencing the area, is collected.

■ The information collected in this way is sent to the data output unit 5.
and these are printed by a printer, for example. Therefore, by analyzing this printed data, it is possible to investigate the reference source program.

C. Effects of the Invention] In this way, the region reference event that causes region destruction can be easily detected, and thus can be used as a very effective means for investigating faults in region destruction.

Of course, it is effective not only for investigating failures, but also for investigating the impact of changing the format of a certain area, such as when you want to detect the referencing program of the control table in order to investigate the impact when creating a new control table. It is.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the principle of the present invention, Fig. 2 is a configuration diagram of an embodiment of the present invention, Fig. 3 is a functional explanatory diagram of the PER monitoring event control register in the present invention, and Fig. 4 is a conventional problem. FIG. 5 is a functional explanatory diagram of a conventional PEH monitoring event control register. 1-Control unit 2-Control register unit 3-PER processing unit

Claims (1)

[Claims] In a data processing device equipped with a program event recording means (3) for investigating the operating state of a program, an indication of an area range in memory and a reference source when a reference is made to this area are provided. A control register section (1) for instructing monitoring, and a control means (2) for collecting necessary data according to instructions from the program/event recording means (3), and for reference to the specified area range. An area reference event monitoring method is characterized in that it is possible to investigate the reference source when an event occurs.