JPH0769837B2 - Load module patch method outside the segment range - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a load module (hereinafter referred to as LM) patch method outside a segment range of a computer system that is stored and managed by a segmentation method.

[Conventional technology]

Conventionally, the area that can be specified with the LM patch was limited to within the segment range, so it was not possible to patch the range beyond the segment size.

[Problems to be solved by the invention]

As mentioned above, if the area that can be specified with the LM patch is limited to the segment range, during source coding,
It is necessary to reserve a patch area for each segment that will be used later in the LM patch. However, it is impossible to know the size of the area required for patching in advance, and there is a problem that if the patch area is used up, it becomes impossible to patch the segment.

[Means for solving problems]

The LM patch method outside the segment range of the present invention is a means for outputting to the LM the segment size and the disk address where the entity of the segment exists for each segment of the computer system that is stored and managed by the segmentation method, It comprises means for inputting a patch command out of the segment range for the LM and means for patching out of the segment range by updating the above segment information according to the patch command.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram mainly showing a data flow according to an embodiment of the present invention. A means for outputting to a LM the segment size and the disk address where the entity of the segment exists for each segment as segment information 11 LM having a linker 1 having the following, a patch input means 12 for inputting a patch command outside the segment range for the LM, and a segment patch means 13 for patching outside the segment range by updating the above segment information according to the patch command. It consists of the patch tool 10.

The relationship between the respective means will be described with reference to the patch command image in FIG. 2 and the segment information in the LM in FIG.

FIGS. 2A and 2B show formats of patch commands outside the segment range and within the segment range. In FIG. 2 (a), EXPAND indicates a patch outside the segment range, in FIG. 2 (b), oldvalue indicates the value before the patch, and newvalue indicates the contents of the patch.

First, the linker 1 uses the segment information output means 11 to
Output the segment information (Fig. 3) to LM15. The LM patch tool 10 inputs a patch command (FIG. 2) by the patch command input means 12. Next, the LM patch tool
The segment patch means 13 updates segment information and executes an LM patch.

The operation of the segment patch means 13 will be described according to the flow of the segment patch (FIG. 4).

First, it is determined whether EXPAND is specified in the patch command (step 41). If EXPAND is specified, it is regarded as a patch command outside the segment range, and the patch size is checked outside the segment range by referring to the patch command Fig. 2 (a) and the segment size in the segment information table 31. Yes (step 42). If it is confirmed that it is outside the segment range, the segment size in the segment information table 31 is updated (step 4
3), patch the entity of the extended segment (step 46).

If EXPAND is not specified, it is considered that the patch command is within the segment range, and the patch command in FIG. 2B and the segment size in the segment information table 31 is referred to and the patch is within the segment range. Check (step 44). When it is confirmed that the value is within the segment range, the patch command FIG. 2 (b) is referred to and the substance of the segment is checked to check that the values before patching match with each other (step 4).
Five). If it is confirmed that the value before patching is correct, patch to the substance of the segment (step 46).

If the patch command (FIG. 2) is found to be illegal by any of the above checks, error processing is performed (step 47).

With the above processing, LM patches outside the segment range are possible.

〔The invention's effect〕

As described above, according to the present invention, it is not necessary to secure the area used in the LM patch in advance, and the size of the segment is expanded so that the patch can be patched outside the segment range. By removing the restriction that further patches cannot be modified, there is an effect that flexibility can be provided for maintenance by LM patches.

[Brief description of drawings]

FIG. 1 is a block diagram mainly showing a data flow of one embodiment of the present invention, FIG. 2 is a diagram showing an image of a patch command, FIG. 3 is a diagram showing segment information of LM, and FIG. 4 is a segment. It is a figure which shows the flow of a patch. 11 …… Segment information output means, 12 …… Patch command input means, 13 …… Segment patch means, 14 …… Patch command, 15 …… LM (load module), 21 …… Patch command outside segment range (new command ),twenty two…
… Patch commands within the segment range (conventional commands), 31 …… Segment information table, 32 …… Segment entity.

Claims (1)

[Claims] 1. A means for storing a segment size of a segment, which is a storage management unit of a computer system managed by a segmentation method, and a disk address where the entity of the segment exists as segment information in a load module, and the load. Means for inputting a patch command designating a segment outside the segment range for a segment included in the module, and updating the segment size of the segment information by the patch command, and applying a patch outside the segment range to the segment corresponding to the segment information. A load module patch system outside the segment range.