JPH0789326B2 - Host computer - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a host computer that is restricted by byte alignment during execution of program instructions.

〔Overview〕

According to the present invention, in a host computer which is restricted by byte boundary adjustment when executing a program instruction, when a byte boundary exception is detected, a byte boundary error is corrected and the program instruction execution is restarted, so that the execution of the program is suspended. This is to prevent this.

[Conventional technology]

Conventionally, when a distribution program of a heterogeneous system is ported to a host computer that is restricted by byte boundary adjustment and a program instruction is executed, if the byte boundary limit occurs and the program terminates abnormally, the cause of the program error is analyzed. Then, after revising the program, the program was restarted from the beginning.

[Problems to be solved by the invention]

Such a conventional program correction means corrects the program and repeats the re-execution even if it is not the problem of the program itself. Therefore, when porting a large program, the program execution is interrupted, analyzed, and corrected (source). Modification, execution program creation) and execution are repeated, and there is a drawback that it takes a long time for the program to complete normally.

The present invention eliminates such drawbacks, and an object of the present invention is to provide a host computer capable of shortening the time required for normal completion of a program even if it is restricted by byte boundary adjustment.

[Means for solving problems]

According to the present invention, in a host computer that sets a byte boundary limit when executing a program instruction and detects the presence or absence of data that exceeds the byte boundary limit, it detects whether or not a program exception occurs in a program instruction to be executed, and the program exception is a byte boundary. An exception analysis processing unit that determines whether it is due to a limit and a program instruction corresponding to a program exception due to a byte boundary limitation are analyzed, and when this program instruction is a data reference instruction or a data update instruction,
Instruction execution restoration processing means for ignoring a program exception and executing the instruction not subject to byte boundary limitation using a working memory which is not subject to byte boundary limitation, and a program after the instruction execution by this instruction execution restoration processing means Restart processing means for restarting the execution of the program instruction corresponding to the exception.

[Action]

Byte boundary restriction exception when referencing or updating data in memory when porting a distribution program that operates in a heterogeneous system, such as an OA-related application program, that is restricted by byte boundary adjustment when executing program instructions Upon receiving the notification, the exception generating instruction is analyzed, and after analyzing the instruction, it is possible to refer to or update the data in the predetermined memory as if the exception did not occur, and control is executed to the exception generating program address after the execution of the exception generating instruction. Migrate and resume program execution.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. First
FIG. 1 is a block diagram showing the configuration of the host computer according to this embodiment.

As shown in FIG. 1, the host computer 1 has a main memory 2 having an execution program 21 and program data 22, a central processing unit 3 for executing a program on the main memory 2, and a byte boundary limitation after detecting a program exception. And a processing unit 4 for performing a canceling process for canceling. here,
The processing means 4 has an exception analysis processing means 41, an instruction execution restoration processing means 42, and a restart processing means 43. That is, in this embodiment, the exception analysis processing unit 41 detects whether or not a program exception has occurred in the program instruction to be executed and determines whether or not the program exception is due to the byte boundary limitation.
And a program instruction corresponding to a program exception caused by the byte generation restriction, and when the program instruction is a data reference instruction or a data update instruction, the instruction execution restoration processing means for ignoring the program exception and executing this instruction 42 and restart processing means 43 for restarting the execution of the program instruction corresponding to the program exception after the instruction execution by the instruction execution restoration processing means.

FIG. 2 is a flow chart showing the operation of this embodiment. Next, the operation of this embodiment will be described with reference to FIG.

When a program exception occurs when the instructions in the execution program 21 on the main memory 2 are read and executed by the central processing unit 3, the type of the exception and the occurrence address are released by the processing means 4.
Notify to. The cancellation processing means 4 saves the register information when the exception occurs in the system memory (step S1). The type of exception occurrence is analyzed to determine whether it is due to byte boundary limitation. If not, control is transferred to normal program exception handling (step S2). In the case of byte boundary limitation, the instruction is read from the exception generation address and analyzed (step S3). In the case of an update instruction, the contents of the register cannot be set directly in the program data, so the contents of the register are temporarily saved in the working system memory (memory at addresses that are not subject to byte boundary restrictions) (step S4).
The contents of the system memory are transferred to the program data address by an instruction not subject to boundary restrictions (step S5). In the case of a reference instruction, the content of data cannot be set directly in the register, so the content of data is transferred to the above-mentioned working memory by an instruction without restriction (step S6), and then the content of working memory is set in the register. (Step S7). In the case of a comparison instruction, the content of the data is transferred to the working memory (step S8), and then compared with the content of the register (step S9). After pseudo-execution of the exception occurrence instruction as cancellation processing, the register at the time of exception occurrence is restored (step S10),
Control is transferred to the exception generation address (step S11).
In this way, program execution can continue without being hit by byte boundary exceptions.

〔The invention's effect〕

As described above, the present invention corrects a byte boundary error and resumes execution without interrupting the program when a byte boundary exception that occurs during program execution is detected. This has the effect of enabling the program to be executed without repeating analysis, modification and execution.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a flowchart showing the processing operation of the embodiment of the present invention. 1 ... Host computer, 2 ... main memory, 3 ... central processing unit, 4 ... release processing means, 21 ... execution program, 22 ... program data, 41 ... exception analysis processing means, 42 ... instruction Execution restoration processing means, 43 ... Restart processing means.

Claims (1)

[Claims] 1. A host computer that sets a byte boundary limit when executing a program instruction and detects the presence or absence of data that exceeds the byte boundary limit, detects whether or not a program exception occurs in a program instruction to be executed, and the program exception is a byte. When an exception analysis processing unit (41) that determines whether it is due to a boundary restriction and a program instruction corresponding to a program exception due to a byte boundary restriction are analyzed and this program instruction is a data reference instruction or a data update instruction Includes an instruction execution restoration processing means (42) for ignoring a program exception and executing this instruction with an instruction not subject to byte boundary limitation using a working memory not subject to byte boundary limitation, and the instruction execution restoration processing means. After the instruction has been executed, the restart processor that resumes the execution of the program instruction corresponding to the program exception. A host computer comprising a step (43).