JPH02144729A - Data processor - Google Patents

Abstract

PURPOSE:To change an error processing procedure in accordance with an area where an error interruption occurs by providing a detecting means to detect the process procedure segment including the error interruption and a segment describer housing means. CONSTITUTION:When an error interruption occurs in a segment of a general process procedure 7 of segment #n, a CPU 5 sets an error procedure segment #6 at (n) and shifts the control to an error interruption detecting means 1. The means 1 acquires the address of an error process describer 3 based on the set value (n) and by reference to the contents of a segment describer 2-n corresponding to the segment #n. Then the control is shifted to an error process procedure 4 by reference the contents of a describer 3. Thus the procedure 4 can be changed for each area (procedure segment) where an error interruption occurrs. Then the procedure 4 can be changed in accordance with the area where the error interruption occurrs.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is applied to electronic computers. In particular, it relates to error handling means when performing data processing.

〔overview〕

The present invention prevents the repeated occurrence of error interrupts that occur within the error processing procedure by providing means for changing the error processing procedure for each error occurrence location in the error interrupt processing means of a data processing device that uses a virtual memory space. In addition, error interrupts occurring within the operating system can be processed separately into system down and task down depending on the segment in which they occur.

[Conventional technology]

Conventionally, when an error interrupt occurs, there are two options: ■ Having only one error handling procedure in the system and always taking the same action when an error interrupt occurs, or ■ Having one and only error handling procedure in the program and taking the same action when an error interrupt occurs. The same procedure is always performed within the program.

[Problem that the invention seeks to solve]

Such conventional error interrupt processing has the following problems: ■ Since the error processing procedure cannot be changed depending on the location where the error interrupt occurs, if an error interrupt occurs within the error processing procedure, the error interrupt may be repeated indefinitely. There are also drawbacks: (1) Since the error handling procedure cannot be changed depending on the location where the error interrupt occurs, there is a drawback that the system will always go down if the error interrupt occurs within the operating system.

The present invention aims to eliminate such drawbacks, and aims to provide a data processing device that can change error handling procedures depending on the location where an error interrupt occurs.

[Means for solving problems]

The present invention provides a data processing apparatus that includes a first storage means for storing a plurality of processing procedure segments and a CPU that executes processing procedures on the segments, and that uses a virtual address space. A detection means for detecting a procedure segment; and a second storage means for storing a segment descriptor for specifying an error processing descriptor, which is provided corresponding to the processing procedure segment; It has an area for storing a plurality of error processing procedure segments specified by the child, and further stores an error processing descriptor specified by a segment descriptor corresponding to the processing procedure segment detected by the detection means from the second storage means. The present invention is characterized by comprising a control means for extracting an error processing procedure designated by the error processing descriptor from the first storage means and providing it to the CPU.

[Effect]

The present invention makes it possible to change the error handling procedure that is activated depending on the location where an error interrupt occurs. The error interrupt is detected using the error processing descriptor indicating the address of the procedure to which the error interrupt is to be moved, and the error processing descriptor indicated by the segment descriptor corresponding to the procedure segment that caused the error interrupt is transferred. Transfer control.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. 1st
The figures are block diagrams showing the configuration of this embodiment.

In this embodiment, as shown in FIG. a storage means, a CPU 5 that executes a processing procedure on the segment stored in the first storage means, and a second CPU 5 that is provided corresponding to the processing procedure segment and that stores a segment descriptor that specifies the error processing descriptor 3. Segment descriptor table 2 which is a storage means
and a detection means for detecting a processing procedure segment in which an error interrupt has occurred during unauthorized access, and an error processing descriptor specified by a segment descriptor corresponding to the processing procedure segment detected by this detection means, from the second storage means. , an error interrupt detection means 1 having a control means for extracting the error processing procedure specified by the error processing descriptor from the first storage means and providing it to the CPU 5.

First, the operation of this embodiment will be explained with reference to FIG.

When an error interrupt occurs in the segment of the primary processing procedure 7 with segment number n, the CPU D'+ sets the error procedure segment number 6 to "n" and transfers control to the error interrupt detection means 1.

The error interrupt detection means 1 refers to the contents of the segment descriptor 2-n corresponding to the procedure segment with the segment number n in the segment descriptor table 2 based on the set value "n" of the error procedure segment number 6 to write an error processing description. Obtain child address 30.

Furthermore, by referring to the contents of the error processing descriptor 3, the address of the error processing procedure 4 is obtained, and control is transferred to the error processing procedure 4.

Next, an example of operation using a combination of a segment descriptor, an error handling descriptor, and an error handling procedure will be described with reference to FIG. It is assumed that the error handling procedure 4-0 performs system down processing, and the error handling procedure 4-1 performs task down processing. Also, error handling procedure 4
-1 segment number is set to 0. When an error interrupt occurs in the segment of the general processing procedure 7 with segment number n, the CPU 5 sets n as the error procedure segment number and transfers control to the error interrupt detection means 1.

The error interrupt detection means 1 refers to the segment descriptor 2-n corresponding to the segment of the general processing procedure 7, then refers to the error processing descriptor 3-n, and executes the error processing procedure 4.
Transfer control to -1. In error processing procedure 4-1, task down processing is performed. At this time, error handling procedure 4-1
When an error interrupt occurs, the CPU 5 sets the error procedure segment number to "0" and transfers control to the error interrupt detection means 1. The error interrupt detection means 1 refers to the segment descriptor 2-0 corresponding to segment number 0 of the error processing procedure 4-1, then refers to the error processing descriptor 3-0, and then controls the error processing procedure 4-0. move. In error processing procedure 4-0, system down processing is performed.

〔Effect of the invention〕

As explained above, the present invention allows changing the error handling procedure corresponding to each location (procedure segment) where an error interrupt occurs, so that when an error interrupt occurs within the error handling procedure, other general procedure segments This has the effect of preventing error interrupts from being repeated indefinitely by executing an error handling procedure that is executed when an error interrupt occurs within the operating system, and another error handling procedure that is executed when an error interrupt occurs within the operating system. Regarding interrupts, it is also possible to distinguish between system down and task down depending on the generated segment.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a flowchart showing the operation of the error interrupt detection means of FIG. 1. FIG. 3 is an explanatory diagram showing the operation of the embodiment of the present invention. 1... Error interrupt detection means, 2... Segment descriptor table novel 2-0, 2-1.2-n... Segment descriptor, 3.3-0.3-1.3-n... - Error processing descriptor, 4.4-0.4-1...Error processing procedure, 5...CPU, 6...Error procedure segment number, 7...General processing procedure.

Claims (1)

[Claims] 1. A first storage means for storing a plurality of processing procedure segments and a CP that executes processing procedures on the segments.
In a data processing device that is equipped with U and uses a virtual address space, there is a detecting means for detecting a processing procedure segment in which an error interrupt has occurred at the time of unauthorized access, and a detection means provided corresponding to the processing procedure segment and specifying an error processing descriptor. a second storage means for storing a segment descriptor, the first storage means having an area for storing a plurality of error handling procedure segments specified by the error handling descriptor; The error processing descriptor specified by the segment descriptor corresponding to the processing procedure segment is extracted from the second storage means, the error processing procedure specified by this error processing descriptor is extracted from the first storage means, and the CPU extracts the error processing descriptor specified by the segment descriptor corresponding to the processing procedure segment. What is claimed is: 1. A data processing device comprising: a control means for controlling the data;