JP3224478B2 - Debug and analysis method by comparing memory access status - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a debugging / analyzing method by comparing memory access states.
More specifically, two memories are prepared, the data at the same address position as the address where the memory was accessed when the program was executed under different program conditions is turned on and stored, and of the stored data, different data is stored. The present invention relates to a method for debugging and analyzing a program which is extracted and displayed.

[0002]

2. Description of the Related Art Conventionally, when a computer program is newly created or a created program is added or modified, debugging is first performed on a desk according to a program list, and then simulation is performed using predetermined data. Program, the quality of the program is evaluated based on the results, and if necessary, a dump list of the in-process data in the working memory area is output to analyze and correct the details.

An ICU (In-Circuit Emulator) is used to efficiently debug and analyze a program written in an assembler language to increase the processing speed, such as a control program for an automobile engine. I have. This involves removing the computer mounted on the system, attaching a general-purpose computer instead, and having this general-purpose computer have a program to be debugged and a program for debugging to perform various simulation operations and automatically debug. Is what you do.

Further, a logic analyzer is used to analyze a partial logical operation of a program.

On the other hand, recent large-scale systems such as automobiles and robots are mainly controlled by programs. A program driven by such a large-scale system has a configuration in which several subprograms are integrated. Many of these subprograms are intricately related to each other. That is, when the system performs an operation, the subprograms related to the operation may be entangled or dispersed. Some of the subprograms are executed only in a specific system operation, while others are commonly used in some system operations.

[0006]

However, as described above, when it is desired to debug or analyze a program area related to only a specific operation of a system constituted by a complicatedly entangled program, first, the purpose and the purpose are as follows. The problem is that it takes a great deal of effort and time to find a specific program area.

When it is desired to debug or analyze a program area related to only a specific operation of the system, it is sufficient to extract a program area related to only the specific operation. In addition, no matter which analysis method is used, there is a problem that it is not possible to extract only a program region related to only a specific operation under a specific condition.

Therefore, when a program stored in the memory is executed under a specific condition, there is a problem that the address data accessing the memory must be extracted and the approximate program area must be detected. I have.

[0009]

In order to solve the above-mentioned problems, a debugging / analyzing method according to the present invention by comparing the access states of a memory includes executing a target program stored in a memory and executing the target program. The first and second memories for turning on and storing data at the same address position as the address at which the memory was accessed at the time, and comparing the data stored in the first and second memories with different data The first memory turns on and stores data at the same address position as the address that accessed the memory when the target program was executed, and the second memory includes: The data at the same address position as the address where the memory was accessed when the target program was executed under different conditions. And stored in turn on the motor, by the extraction means, it is that the divergent portion of the data stored in the first and second memory and to display extracted from the second memory.

[0010]

The debug / analysis method based on the comparison of the access state of the memory according to the above configuration is a program area executed when the system is normally operated, that is, a set of accessed addresses, that is, a set of addresses accessed, The set where data was turned on was compared with the set of turned-on data at the same address position as the program area executed when the specific operation under different conditions was performed, that is, the accessed address, and the specific operation was performed. By extracting and displaying the data, it is possible to easily detect the outline of the program area executed under a specific condition, and it is possible to perform debugging and analysis easily and in a short time.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a debugging / analyzing method according to the present invention by comparing access states of memories will be described below with reference to the drawings.

As shown in FIG. 1, the debugging / analyzing method includes a memory 1 storing a target program to be debugged, and an address data of the memory 1 stored in a first memory 3 and a second memory. And the first and second memories 3 and 4 which have the same memory area as the memory 1 and turn on and store data at the same address position as the accessed address of the memory 1.
And a memory comparison program unit 5 for comparing data stored in the first and second memories, and a comparison result unit 6 for extracting and displaying a comparison result. Among them, the memory comparison program means 5 and the comparison result means 6 constitute an extraction means.

The memory 1 is, for example, a ROM, and may be built in the microcomputer as in the case of a one-chip microcomputer, or may be external to the microcomputer, and its functions and types are not limited.

As is well known, the memory 1 and the CPU mounted on the microcomputer are composed of an address bus consisting of N lines for transferring binary N-digit address numbers and a data bus for reading data. It is connected. When an address of the memory 1 is designated from the CPU via the address bus and a read signal is given, the instruction word stored at the designated address of the memory 1 is read out by the CPU via the data bus and executed. .

The memory bank switching circuit 2 has one input terminal, two output terminals, and a switch circuit for connecting the input terminal to one of the two output terminals.

An input terminal of the memory bank switching circuit 2 is connected to an address bus via a connection circuit (not shown). This connection circuit has a structure that can be easily attached to the address bus in a clip shape and connected. Thus, the address data existing on the address bus can be supplied to the memory bank switching circuit 2.

The two output terminals of the memory bank switching circuit 2 are connected to the first and second memories 3 and 4, respectively. The switching is controlled by an operation mode selection signal of the system. When the operation mode is a specific operation mode, the input terminal is connected to the second memory 4. When the operation mode is not the specific operation mode, the input terminal is connected to the first memory 3. To be connected.

Each of the first and second memories 3 and 4 has the same capacity as the memory 1 and is composed of a normal RAM. The access time of this RAM is set sufficiently shorter than that of the memory 1. Therefore, the first and second memories 3 and 4 input a read signal from the CPU to the memory 1 and use the read signal as a trigger for its own writing each time to read address signals on the address bus. Turning on and storing the corresponding data at the same address position can be accurately and sequentially written through the memory bank switching circuit 2.

Therefore, when a normal operation mode which is not a specific operation of the system is selected, a list of address numbers storing instruction words to be executed to operate the system in the normal operation mode, that is, an address at which the memory 1 is accessed. And turns on the data at the same address position in the first memory 3 and stores it. Similarly, when a specific operation mode of the system is selected, a list of address numbers storing instructions executed to operate the system in the operation mode, that is, an address at which the memory 1 is accessed is extracted. The data at the same address position in the second memory 4 is turned on and stored.

Some of the subprograms or subroutines executed in each operation mode are executed only in the operation mode alone, while others are commonly used in each operation mode. Second memory 4
The data stored in each of the data includes different parts and the same part.

Then, the data stored in the first and second memories 3 and 4 are compared by the memory comparison program means 5, and the data stored in both are removed from the second memory 4.

Next, if only data operated under different conditions is extracted from the second memory 4 and displayed,
An approximate program area related to only a specific operation is obtained.

If data related to a specific operation stored in the second memory 4 is displayed or printed and used for debugging or analysis, a general program area related to the specific operation can be understood. Debugging can be performed efficiently.

As a device for realizing the method according to the present invention, it is possible to easily configure a debugging device that continuously performs each function as shown in FIG. 1, or The processing by the memory comparison program means 5 may be performed later by a general-purpose computer such as a personal computer.

[0025]

As described above, according to the debugging / analyzing method by comparing the access states of the memory according to the present invention, the program area related only to a specific operation of the system can be roughly known. Debugging and analysis can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a debug / analysis method based on comparison of access states of a memory according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 memory 2 memory bank switching circuit 3 first memory 4 second memory 5 memory comparison program means 6 comparison result means

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-154256 (JP, A) JP-A-59-35257 (JP, A) JP-A-5-34189 (JP, A) 120254 (JP, U) NIKKEI ELECTRONIC S 1982. 3.15 PP. 137-144

Claims (1)

(57) [Claims] 1. A target program stored in a memory.
And the memory when the target program is executed.
Turn on data at the same address location as the accessed address
Comparison between the first and second memories to be stored and the data stored in the first and second memories
And extracting means for extracting different data, wherein the first memory executes the target program.
Same address as the address that accessed the memory when
The second memory stores the data at the address of the target program.
Access to the memory when executed differently
Turn on the data at the same address position as the dress and store it
The extraction means stores the data in the first and second memories.
The different part of the data being stored in the second memory.
A debugging and analysis method based on a comparison of memory access states, characterized in that the data is extracted and displayed .