JPS61156339A - Trace processing system - Google Patents

Abstract

PURPOSE:To reduce adverse effects to the trace processing speed by setting previously a necessary trace processing routine to a microprogram to omit the decision for necessity of the trace processing for each routine and improving the trace processing efficiency. CONSTITUTION:A trace table 8 stores the addresses stored in a control storage 5 of routines A, B... respectively. A control part 11 controls an address counter 3 through the table 8 and has a function to rewrite the contents of the storage 5. Then the part 11 refers to the addresses of the routines A, B... stored in the table 8 to rewrite a microprogram stored in the storage 5 after a trace code signal is supplied to a signal register 2. Thus it is possible to obtain a program containing the trace processing set into a routine requiring the trace processing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a trace processing method by rewriting a microprogram in an information processing system equipped with a microprogram control method.

As a method for debugging information processing systems or pursuing the cause of failures that occur during system operation,
A method is used in which a trace processing function that records program execution process data or execution history data of various devices as trace data is used to search for the cause while comparing the obtained trace data with the failure phenomenon.

However, if necessary tracing processing is performed while a program is being executed, the processing speed of the program will naturally slow down, so it is desired to perform efficient tracing processing with as little influence on processing speed as possible.

[Conventional technology]

FIG. 3 is a block diagram illustrating the conventional system, and FIG. 4 is a diagram illustrating the process of executing the program.

In FIG. 4, microprogram routines A, B, and C are processed during the execution process of the microprogram.

It is assumed that trace processing is performed at the time when routine B and C are completed, and trace entry processing is not necessary for routines B and C.

In order to perform the trace processing section only on routines that require tracing, the operator sends a trace code signal to the signal register 2 by operating a keyboard or the like from the console in advance. This trace code signal indicates whether tracing processing is necessary for each routine.

On the other hand, the control storage 5 stores the microprogram routines A, B, C, etc., and the control unit 1 outputs the microinstruction stored at the address indicated by the address counter 3 to the instruction register 6 The microinstructions written to the instruction register 6 are decoded and executed.

As shown in FIG. 4, the program routines are executed sequentially, and when the routine processing (step 1) is finished, the control unit 1 refers to the trace code signal in the signal register 2 to determine whether or not tracing processing of the routine concerned is necessary. Check (Step 2).

When the trace code signal indicates that tracing of routine A is necessary, a start signal is sent to the trace processing unit 7, and the trace processing unit 7 performs the trace processing in the state where the processing for the executed routine has been completed (step 3. Note that this tracing process itself is also executed by the trace routine of the microprogram). When the tracing process is completed, the process moves to the next routine B (step 4).

At the end of routine B, the trace code signal in signal register 2 is checked again (step 5). Routine B does not require trace processing and the trace code signal in signal register 2
Since there is no instruction that tracing is required, the program moves to the next routine C (step 6).

In this way, a step of checking the signal register 2 is inserted every time each routine ends.

[Problem to be Solved by the Invention 3] As explained above, in the conventional system, the signal register 2 is checked at the end of each routine to determine whether or not to perform trace processing. There was a problem in that additional steps were inserted, which took extra time.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides that when a trace execution signal is input to the signal register, the control unit stores the trace processing table in the control storage based on the contents of a trace processing table prepared in advance. This problem is solved by the trace processing method of the present invention, in which a microprogram is rewritten to incorporate a trace processing routine or a branch instruction to a trace routine only in necessary parts before the program is executed.

[Effect]

As mentioned above, since the program in the control storage is rewritten before the program is executed, it takes extra time to check whether the trace execution signal has been input to the signal register at the end of each routine process. Therefore, the program processing time becomes faster.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a block diagram of one embodiment of the present invention, and FIG.
The figure shows a diagram illustrating the process of executing the program shown in FIG. Note that the same reference numerals refer to the same objects throughout the plan.

In FIG. 1, the trace table 8 stores the addresses of the routines ^, B, C, . . . in the control storage 5.

The control unit 11 has an additional function of controlling the address counter 3 and rewriting the contents of the control storage 5 using the trace table 8. When a trace code signal is input to the signal register 2, the trace table 8
Routine A stored in .

Referring to the addresses B, C, . . . , the microprogram stored in the control storage 5 is rewritten into a program that incorporates trace processing into a routine that requires trace processing.

For example, as shown in Figure 2, the routine ^, B, C,
,.

If the routine ^ is a routine that requires trace processing, replace the final instruction to the routine with a branch-and-link instruction, move the final instruction to the routine to the beginning of the trace processing routine, and connect to the trace processing routine. Do it like this.

As mentioned above, the rewritten microprogram is executed in the order of addresses, and when the routine ^ is executed and a branch and link instruction is reached (step l),
Branch to the last instruction of the routine A and execute it (Step 2), then perform trace processing (Step 2).
knob 3), return to the control storage 5 again and execute routines B and C (step 4.5).

〔Effect of the invention〕

As described above, according to the present invention, a necessary trace processing routine is incorporated in the microprogram in advance.

Therefore, it is not necessary to judge whether or not tracing processing is necessary for each routine, so that tracing processing can be performed efficiently and the influence on processing speed can be reduced.

[Brief explanation of drawings]

Figure 1 is a block diagram showing an embodiment of the trace processing method of the present invention, Figure 2 is a diagram explaining the execution process of the trace processing of the present invention, and Figure 3 is a block diagram explaining the conventional trace processing method. , FIG. 4 is a diagram illustrating the execution process of conventional trace processing. In the figure, °ζ, 1.11 is the control section, 2 is the signal register,
5 is a control storage, 6 is an instruction register, 7 is a trace processing unit, and 8 is a trace table. IEI Figure 3m

Claims (1)

[Claims] A trace code that includes a control storage that stores a microprogram, a trace table that holds addresses of each routine in the microprogram, a means for rewriting the microprogram, and a means for performing tracing processing, and that instructs a routine that requires tracing. A trace processing method characterized in that the trace processing routine is incorporated into the microprogram before executing the microprogram based on the trace table by inputting a signal.