JP2978658B2 - Program development support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a program development support device, and more particularly to a program development support device used for microcomputer program development.

[0002]

2. Description of the Related Art When a program such as a microcomputer is developed, in a predetermined area of a target program, for example, external interrupt processing, illegal data is rewritten or destroyed due to a design error or a program instruction description error. Sometimes.

Conventionally, when detecting this type of data destruction, a data destruction detection program is created for each predetermined area of the target program, installed, and detected using a break function of a program development support device. .

Next, an example of this method will be described with reference to the drawings. FIG. 4 is a block diagram for explaining an example of a conventional program development support device. This program development support device includes a device 8 for setting a break condition of a target program, a break control device 9 for controlling a break of the target program, and a storage device 7 having a target program and a storage area used by the target program. I have.

FIG. 5 is an operation flowchart used by the program development support apparatus of FIG. First, the data destruction inspection program will be described. The data destruction inspection program is composed of two steps: (S14) one inspection program to be executed when executing the start address of the target program, and (S15) two inspection programs to be executed when executing the last address.

The processing content of the inspection program 1 is (S1
7) First, at the time of executing the start address of the predetermined area of the target program, (S7) the value of the data area to be inspected for data destruction is saved in a free area of the storage device.

The processing contents of the inspection program 2 are described in (S9)
The value of the data area to be checked for data destruction at the time of execution of the end address of the predetermined area is compared with the data stored in the free area of the storage device by the inspection program 1 (S21).
As a result, if they do not match, it is skipped to a specific address.

[0008] Each of these check programs is incorporated into a target program, and (S16) a break is set at a specific address of the check program 2 (S10) using a break function of the program development support device.

(S4) After making the above preparations, the target program is executed. (S19) Then, the data destruction inspection is performed, and when all the inspections are completed, (S20) the data destruction inspection program is erased from the target program.

[0010]

The above-mentioned conventional program development support apparatus is a program for detecting data destruction when detecting unauthorized data rewriting or destruction in a predetermined area of a target program in a microcomputer or the like. However, there is a disadvantage that it takes a lot of time and labor because the inspection is performed by assembling.

It is an object of the present invention to provide a program development support apparatus for automatically detecting unauthorized data rewriting or destruction in a predetermined area of a target program.

[0012]

A program development support apparatus according to the present invention stores in advance a start address and an end address of a predetermined area of a target program stored in a storage device, and executes the target program. A program predetermined area detection device that outputs a head address passing signal when the head address is reached, or a tail address passing signal when the tail address is reached, and an address of a predetermined data storage area. An address storage device for storing, a data reading device for reading data stored at an address stored in the address storage device from the storage device, and an output of the program predetermined area detection device, the data reading device reading the data. A data storage unit that stores data, and a data storage unit that is stored in the data storage device. Data comparing device that compares the data read by the data reading device and outputs a comparison result, and a control device that controls execution and stop of the target program by the output of the data comparing device. It is comprised including.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a program development support device according to a first embodiment of the present invention.

The program development support apparatus according to the present embodiment includes a program predetermined area detection device 1 for detecting a predetermined area of a target program, and a storage device 7 for storing data in an area indicated by the address storage device 2 when the start address of the predetermined region is executed. Data reading device 5 for storing data in data storage device 3
A data comparison device 4 for comparing the data stored in the data storage 3 at the time of execution of the end address with data in an area indicated by the address storage device 2, control of execution and stop of the target program, and input of comparison data And a control device 6 for performing control and data comparison control. FIG. 2 is a flowchart for explaining the operation of the block in FIG. (S1) First, the address of the target data memory as a break condition is set in the address storage 5. (S2) The start address for determining the range of the predetermined area is set in the start address storage unit in the program predetermined area detection device 1. (S3) The end address that determines the range of the predetermined area is set in the end address storage unit in the program predetermined area detection device 1. (S4) The control device 6 sends a control start request signal to execute the target program. (S5) After execution of the program, a predetermined area is detected by the program predetermined area detection device 1. (S6) At the time when the start address of the predetermined area is determined (S7), the value of the data memory targeted for the break condition is stored in the data storage device 3. (S
8) Judge that the end address is executed. (S
9) Then, the data comparison device 4 compares the value of the target data memory temporarily saved in the data storage device 3 at the time of executing the start address of the predetermined area with the value of the target data memory at the time of executing the end address. (S10) As a result, if they do not match, the execution of the target program is stopped. (S11, S1
2) In the case of a match, an execution operation is performed according to a normal program instruction. Then, the process returns to (S5).

Next, another operation of the block of FIG. 1 will be described with reference to the flowchart of FIG. (S1) First,
The address of the target data memory which is a break condition is set in the address storage 2. (S2) Next, the start address for determining the range of the predetermined area is set in the start address storage unit in the program predetermined area detection device 1. (S4) The control device 6 sends a control start request signal to execute the target program. (S5) After executing the program, the program predetermined area detection device 1 automatically detects an area starting from the address stored in the head address storage unit until the return instruction appears as a predetermined area.

(S6) When the start address of the predetermined area is determined, (S7) the value of the data memory subject to the break condition is stored in the data storage device 3. (S13) Next, it is determined that the return instruction is executed. (S9) Then, the data comparison device 4 compares the value of the target data memory temporarily saved in the data storage device 3 when the head address of the predetermined area is executed with the current value of the target data memory. (S10) As a result, if they do not match, the execution of the target program is stopped. (S11, S12) In the case of a match, an execution operation is performed according to a normal program instruction, and the process returns to (S5).

[0017]

As described above, the program development support apparatus of the present invention is a program for detecting data destruction when detecting unauthorized data rewriting or destruction in a predetermined area of a target program in a microcomputer or the like. This makes it possible to easily detect rewriting or destruction of unauthorized data in a predetermined area of the target program without performing inspection by creating and incorporating the data.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a flowchart for explaining an example of the operation of the block in FIG. 1;

FIG. 3 is a flowchart for explaining another example of the operation of the block in FIG. 1;

FIG. 4 is a block diagram showing an example of a conventional program development support device.

FIG. 5 is a flowchart illustrating an example of the operation of the block in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Program predetermined area detection device 2 Address storage device 3 Data storage device 4 Data comparison device 5 Data reading device 6 Control device 7 Storage device

Claims (1)

(57) [Claims] 1. A head address and a tail address of a predetermined area of a target program stored in a storage device are stored in advance, and when the target program is executed and the head address is reached, a head address passing signal is provided. Or a program predetermined area detection device that outputs a tail address passing signal when the end address is reached, an address storage device that stores an address of a predetermined data storage region, and a program that is stored in the address storage device. A data reading device for reading data stored at an address being read from a storage device, a data storage unit for storing data read by the data reading device according to an output of the program predetermined area detection device, Stored data, read by the data reading device A data comparison device that compares the data with the data and outputs a comparison result; and a control device that controls execution and stop of the target program by the output of the data comparison device. apparatus.