Method and apparatus for positioning target file

Abstract

The provided locating method for target file comprises: before loading, relocating the absolute address of target file; after loading, relocating its relative address, and completing the whole process. Wherein, the related devices comprise: a specific memory, a distribution pre-processor, and a relocating module for target file. This invention can improve memory utilance greatly, and reduces complexity for relocation and maintenance.

Description

technical field [0001] The invention relates to the field of computer applications, in particular to a method and device for locating target files. Background technique [0002] Embedded system is a special-purpose computer system based on computer technology, application-centric, and software and hardware can be tailored. When embedded devices or other devices implement functions such as dynamic modules or online patches, it is usually necessary to dynamically load a program module onto the target device, which involves the problem of dynamically relocating the target file. [0003] In the computer system, the target file refers to the binary expression of the program module. Before the target file forms an executable program together with other modules of the application, its position in the memory is not fixed, and the addresses contained in it are all floating. address. The floating addresses in the object file include relative addresses and absolute addresses. The ab...

AI Technical Summary

Problems solved by technology

[0018] 1. Each target device must be equipped with a maintenance host, which maintains a record of all positioning-related information of the target device offline, and the maintenance cost is relatively high

And once the offline record is inconsistent with the target device, it will cause serious consequences

For example, suppose a maintenance client is used to maintain two target devices, one of which has loaded a target file A on device P, and nothing has been loaded on the other device Q, and now it is necessary to load target file B to P, but an error The location record of device Q is used indiscriminately. Since there is no information about the target file A on Q, B may overwrite A directly, causing the system to crash.

To avoid this situation, complex verification is required, and the cost is high;

[0019] 2. The target device must reserve a location in the memory for the target file, so as to ensure that the offline positioning of the target file must be successful, which greatly reduces the memory utilization of the target device

For example, if the offline positioning device assigns the target file to the location A1, but this location is already occupied by a program during operation, the loading of the target file will fail;

[0020] 3. This method is complicated to implement and cannot effectively use existing resources. There is no ready-made general tool to complete this offline relocation of target files. The entire offline relocation process can only be completed by the designer's code

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