JP2002297388A - Down loading method for system part program, system used for the same and system part program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the down loading method of a system program which can shorten the time. SOLUTION: The down loading method of the system part program of a machine controller via communication has a program storage means S101 for receiving the system part program of a relocatable object file and for storing it in a system memory as a new section, a section name cheek means S102 for checking the section name and deleting the new section when the same name section does not exists, a symbol check means S105 for checking the matching of the global symbol of the new section with the global symbol of an existed section when the section name exists and for deleting the new section when they are not matched, a location means S107 for locating the new section when they are matched and for generating located location information and a relocating means 109 for relocating and deleting the existed section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a system program download method for shortening the download time of a system program by enabling partial loading of a system program of a machine controller.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, in a machine controller 42, a system program 41 is downloaded via communication to all system memory areas 44 except for a boot memory 43 which cannot be rewritten. I was Further, the system program 41 was constituted by one executable object file.

[0003]

However, in the conventional method, since all system programs are downloaded, there is a problem that data communication takes time and the download time becomes longer. Further, for example, when it is desired to use a different library or the like depending on the version upgrade, even if it is desired to replace one part (library) of the system program, it is necessary to replace all the system programs, so that there is much waste. Was. Therefore, the present invention provides a relocatable object file for downloading only the changed system program in a section, and executes locating by locating means in the machine controller. It is an object of the present invention to provide a method of downloading a system part program that can reduce the time required for downloading.

[0004]

According to an aspect of the present invention, there is provided a method for downloading a system part program of a machine controller, which upgrades a system controller by downloading a system program through communication. A program storage means for receiving a system part program composed of a relocatable object file having relocation information of a section name and symbol information and storing it as a new section in a system memory pool of a system memory divided for each section; Section name checking means for checking whether a section with the same name exists in the system memory using the section name of the section and deleting the new section if there is no section with the same name;
If a section name of the same name exists in the system memory, a check is made for a match between the global symbol of the new section and the global symbol of the existing section; if not, the symbol information checking means for deleting the new section; If they match, locating the global symbol of the relocation information of the new section is performed, and the located address is added to the relocation information to create location information. Locating means for deleting sections;
If the locating is normally performed, relocating an existing section having a matching global symbol and deleting the existing section is provided, and a system part program is downloaded for each section. I have. According to a second aspect of the present invention, in a system memory used for downloading a system part program by a machine controller, codes (programs) and data for each application and location information storing address arrangement information of the codes and data are stored. It is characterized in that it is divided for each configured section and has a system memory pool as a free area. According to a third aspect of the present invention, in the system part program used for downloading the system part program by the machine controller,
It is created as a relocatable object file having a code that can be relocated to an address downloaded to one section of the system memory, data, a section name indicating a download target, and relocation information storing symbol information to be relocated. Features. According to the method of downloading the system part program, the system memory of the machine controller is divided into sections when the system program of the machine controller is downloaded in the case of version upgrade or the like. On the other hand, a system part program to be downloaded for each section is created as a relocatable object file consisting of a code that can relocate addresses, data, a section name indicating the download target, and relocation information that contains symbol information to be relocated. If the global symbol of the system part program stored in the new section of the system memory is compared with the global symbol of the existing section of the same section name of the system memory by the checking means of the controller, and it matches, the location is determined. Locating the new section by means and converting it to the real address of the system memory, relocating the symbol of the existing system program by the relocating means and deleting the old section By Rukoto, it is possible to interchange of each section. In this case, the symbol information of the program is defined by global symbols valid in the entire area of the file and relocated.
One copy can be downloaded to the system memory.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a system memory in a method of downloading a system part program according to an embodiment of the present invention. FIG. 2 is a diagram showing download of the library program shown in FIG. FIG. 3 is a flowchart for downloading the library program shown in FIG. In FIG. 1, reference numeral 2 denotes a machine controller to be downloaded. Reference numeral 4 denotes a system memory composed of a system program divided for each section and a system memory pool that is a free memory. Reference numeral 6 denotes a system part program created by a relocatable object file to be downloaded. This system part program (for example,
The library program 6) is downloaded as one section program of the system program 4 via communication.

FIG. 2 shows an example in which the library program 6 is downloaded. The system memory 4 includes sections divided according to applications such as a kernel section 10, a library section 11, a driver section 12, and the like, and a system memory pool 13 which is free memory. One section is, for example, the kernel section 10 is a code (program).
18, data 22, code and relocatable symbol information included in the data, and location information 14 in which address information at the time of locating is stored. One system part program (library program) 6
In addition to the same structure as one section, a section name 9 is added. At the time of downloading, the downloaded library program 6 is stored in the system memory pool 13, located and rewritten from relocation information to location information. Thereafter, the original library section 11 is deleted and becomes a system memory pool.

Next, the operation will be described with reference to the drawings. Referring to FIG. 3, first, the machine controller 2 receives the system part program 6 (S100), and stores it as a new section in the system memory pool 13 by the program storage means (S101). Next, the section name checking means is used to check whether a section having the same name exists in the system memory 4 by using the section name 9 added to the stored system part program and sent (S102). If the section names do not match (S103), the new section secured in the system memory pool 13 is deleted (S104). If the section names match in the judgment of S103, the location information 1 of the existing section is determined by the symbol information checking means.
5 and the global symbol stored in the relocation information 17 of the downloaded new section (S10).
5) If both global symbols do not match (1
06), the new section secured in the system memory pool 13 is deleted (S104). If the global symbols match in the judgment of S106, locating is performed for the symbol of the relocation information 17 of the new section by the locating means, and the located address is added to the relocation information 17 to create location information (S107). . If the location information has an error and cannot be normally located (S108), the new section secured in the system memory pool 13 is deleted (S104). If it is determined in S108 that the section has been normally located, the relocating means executes relocation of the existing section (in this case, the library section 11) having a global symbol that matches the global symbol of the new section (S109). Finally, the old section 11 is deleted and changed to the system memory pool (S110). This state is the state of the system memory indicated by the arrow in FIG. 2, and the upgraded library section is replaced, and the download of the system part program (library program) 6 ends. In the above, the download in which the library section 11 is replaced with the version-up library program 6 has been described, but it is needless to say that the library program is not limited to the library program.

[0008]

As described above, only the system program of the changed section of the section memory divided for each section is downloaded as a relocatable object file, and the locating is executed by the locating means of the machine controller. It is possible to download a part of the system program. For example, when it is desired to use a different library, it is not necessary to replace the entire system program as in the related art, and only the library program needs to be downloaded. This has the effect of shortening the download time.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a system memory of a system for downloading a system part program according to an embodiment of the present invention.

FIG. 2 is a diagram showing downloading of a library program shown in FIG. 1;

FIG. 3 is a flowchart of downloading a library program shown in FIG. 2;

FIG. 4 is a configuration diagram of a conventional method for downloading a system program.

[Explanation of symbols]

 2 Machine controller 4 System memory 6 System part program 9 Section name 10, 11, 12 Section memory 13 System memory pool 14, 15, 16 Location information 17 Relocation information 18, 19, 20, 21 Section code 22, 23, 24, 25 Section data

Claims (3)

[Claims] 1. A method of downloading a system part program of a machine controller, which upgrades a system program by downloading the system program through communication, comprising: a system part configured by a relocatable object file having section name and symbol information relocation information. A program storing means for receiving a program and storing it as a new section in a system memory pool of a system memory divided into sections, and checking whether a section having the same name exists in the system memory using the section name of the new section If there is no section with the same name, the section name checking means for deleting the new section, and the global section of the new section if a section name with the same name exists in the system memory. Symbol information checking means for checking the match between the global symbol of the existing section and the global symbol of the existing section, and deleting the new section if they do not match, and locating the global symbol of the relocation information of the new section if the global symbol matches Locating means for adding the located address to the relocation information to create location information, determining whether the locating is normal, and locating normally if the locating cannot be performed normally, and deleting the new section; and Means for relocating an existing section having a matching global symbol to delete the existing section, and downloading a system part program for each section. Download method. 2. A system memory used for downloading a system part program by a machine controller, wherein each section includes a code (program), data for each application, and location information storing address arrangement information of the code and data. A system memory used for downloading a system part program, which is divided and has a system memory pool as an empty area. 3. In a system part program used for downloading a system part program by a machine controller, a code, data, a section name indicating a download target and a rearrangement of an address to be downloaded to one section of a system memory are provided. A system part program used for downloading a system part program, which is created as a relocatable object file having relocation information storing symbol information to be stored.