JPH04153741A - Adverse debugging execution system for debugged program - Google Patents

Abstract

PURPOSE:To acquire the necessary information and to eliminate the overhead by providing an instruction converter means and an adverse execution means which replaces an instruction obtained by the instruction converter means with another instruction preceding the instruction to be carried out next and performs a processing procedure for the adverse execution. CONSTITUTION:When a user tries to perform the adverse execution, an instruction converter means 12 converts the instruction 'br' which is processed precedently by a step into an instruction 'br 0x20' based on a conversion rule table 7 and by reference to an adverse execution information store file 2. An adverse execution means 13 stores the next instruction 'add' and replaces the 'br 0x20' produced the means 12 with an address including the 'add' if a debugged program is carried out halfway and the user tries to perform the adverse execution. Thus it is possible to omit such a troublesome case where the debugged program is carried out again from its head if the necessary information could not be obtained due to an operating mistake, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for backward execution of a debugged boogram when debugging an fDram.

[Prior Art] Conventionally, in this type of debugging method, when debugging a program to be debugged, the program to be debugged is executed only in the forward direction, but cannot be executed in the reverse direction. Can not.

[M1ll to be Solved by the Invention] In the above-mentioned nine conventional techniques, even when the program to be debugged is executed and the necessary information can be obtained from the previous instruction, the previous line is It is necessary to execute the same process from the beginning of the debugging program as in RIKUDORU! The disadvantage is that it requires overhead to obtain the appropriate information.

[Means for solving the problem] As a means for solving the problem, the present invention provides a debugging process having a man-machine interface.
When a machine language instruction is processed during execution of the debugged program, information necessary for instruction conversion is obtained from the data area, text area, and register in the memory of the debugged program based on the save request table;
A conversion information saving means that stores the conversion information in a backward execution information storage file, and a conversion information saving means that stores the conversion information in a backward execution information storage file.
An instruction converter that refers to the backward execution information storage file and converts the nine instructions executed previously based on the conversion rule table, and executes the instruction generated by the instruction converter in the first order. Replace the command with the one before the command,
We are developing a backward execution means for performing a backward execution procedure.

[Operation] According to the above-described means of the present invention, a previous instruction can be easily re-executed.

[Example code] Next, the present invention will be explained in detail with reference to the drawings.

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

The backward debugging execution method for the program to be debugged according to the embodiment includes a conversion information saving means 11, an instruction conversion means 12,
A debug process 1 including a backward execution means 13 and a backward execution information storage file 2.

memory 3, register 4, program counter 5,
It consists of a save request table 6 and a conversion rule table 7.

Further, FIG. 2 is a schematic diagram showing an image in which a program to be debugged is allocated to the memory 3.

Next, the operation of the present invention will be explained with reference to the drawings.

The conversion information saving means 11 converts information based on the saving request table 6 at the time when the program to be debugged executes the br instruction (branch instruction) shown at O in FIG.

The address where the br instruction is located and the jump destination address are stored from the memory 3 into the backward execution information storage file 2. or,
At the time of executing the add instruction shown in ■ in FIG.
6) is stored in the backward execution information storage file 2.

If the user attempts to perform backward execution when the debugged program has been processed up to ■ in FIG. Based on the conversion rule table 7, the br instruction (■ in Figure 2), which is an instruction processed in
! Convert to 20”.

When the program to be debugged has been filled up to ■ in FIG. 2 and the user attempts to execute it in the backward direction, the backward execution means 13 stores the next instruction, the aid instruction, and
"l>r 0x20 generated by the instruction conversion means 12
” with the address where the add instruction is located. Then,
After executing the program to be debugged in a single step, the program counter 5 is stored and the 9 add instruction is replaced with the address of the user, and the program counter 5 is returned to the counter at the time of 0x20.

[Effects of the Invention] As explained above, according to the backward execution method when debugging a debugged program of the present invention, if necessary information cannot be obtained due to an operator error or the like during debugging, the debugged program There is no need to re-execute the process from the beginning, and the overhead caused by this can be eliminated.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the backward execution method in depacking according to the present invention, and FIG. 2 is a schematic diagram showing an image in which a program to be debugged is allocated to memory. In FIG. 1, l...Debug processing, 2...Reverse execution information storage file %3...Memory, 4...Register, 5...Program 2 counter, 6-...Evacuation request table. 7...
- Conversion rule table, 11-... Conversion information saving means,
12--Instruction conversion means, 13--Reverse direction execution means.

Claims (1)

[Scope of Claims] In debug processing having a man-machine interface, when a debug target program is executed, at the time when one machine language instruction is processed, based on a save request table, a data area in the memory of the debug target program, and text area, and the information necessary for converting instructions from registers,
A conversion information saving means that stores the information in a backward execution information storage file, and when a user requests backward execution,
an instruction converter that refers to the backward execution information storage file and converts the previously executed instruction based on the conversion rule table; and an instruction that executes the next instruction generated by the instruction converter. 1. A backward execution method for debugging a program to be debugged, comprising: a backward execution means for replacing the previous instruction with a backward execution procedure.