JPS6159550A - Method for control and conversion between programs - Google Patents

Abstract

PURPOSE:To remove an unnecessary program from a link pack area and to prevent the extension of the link pack area by carrying out a program in the link pack area by a region. CONSTITUTION:When an entry control table (CDE)16 is searched on a name of the entry on the condition that the name of the entry is not modified to an address, whether a flag CDEISP in a table 16 is on or not is checked by an in-storage program package ISP check part 8 if a symmetric control table 16 is not searched. When the flag CDEISP is on and the required name of the entry exists in the same ISP as the required place, the required name of the entry in an entry name storage area is reloaded on the entry address. After reloading, an after-processing is carried out in accordance with a standard linkage interface to carry out the delivery of control.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a control transfer processing method between programs, and in particular to a method for transferring control between programs resident in virtual memory without increasing the system area in virtual memory. This invention relates to an inter-program control transfer processing method that allows for high-speed processing.

[Conventional technology and problems]

In computer systems that perform virtual memory control.

In general, virtual storage has an individual user area that has unique content for each virtual space, and a system area that has common content for each virtual space. The system area includes 9 so-called link puncture areas (LPA), which are areas for making modules registered in the system resident in memory, and 1 individual user areas, where user programs are coded. A region is provided as an execution area.

Conventionally, when transferring control of a program in the link pack area, the address to which the control is transferred is fixed, so at least the second and subsequent transfers of control are not performed using the request entry point name, but using the entry point address. By doing so.

Efforts were being made to speed up the transfer of control.

However, in transferring control of a program in the above region, since the entry point address is not fixed, it is necessary to transfer control based on the requested entry point name.

Therefore, even if the program should originally run in the 2 individual user areas, programs that require execution performance to be important are placed in the link bank area, which allows the link bank area common to the system to There was a problem in that the size increased and the unique space of the two individual user areas was compressed.

[Means for Solving the Problems] The present invention aims to solve the above problems, and allows programs in the link pack area to operate in a region without deterioration in performance regarding control transfer between programs. To make it possible to suppress the expansion of the link bank area by expelling unnecessary programs from the link bank area. Therefore, the inter-program control transfer processing method of the present invention processes control transfer between programs packaged and made resident on virtual memory.
means for determining whether a request entry point name in a system macro instruction related to inter-program control transition has been changed to an entry point address; and determining by the determining means that the request entry point name has not been changed to an entry point address. When the request entry point name is in the same resident program package as the source of the control transfer request, change the above request entry point name to the entry point address of the request entry point, and then perform the processing related to control transfer. and means for executing processing related to control transfer for the entry point address when it is determined by the determining means that the request entry point name has been changed to an entry point address. There is.

[Effect]

The present invention provides a technical means for making a program package resident in an individual user area on virtual memory;
This was done by focusing on combining the conventional means for module control in the link pack area.
If the control transfer destination is also resident in the individual user area.

The above-mentioned problem is achieved by immediately transferring control using the entry point address in response to the second and subsequent control transfer requests.

〔Example〕

An embodiment will be described below with reference to one drawing.

FIG. 1 shows the configuration of an embodiment of the present invention, FIG. 2 is an explanatory diagram of an entry control table, and FIG. 3 is an explanatory diagram of processing according to the embodiment shown in FIG.

In FIG. 1, a system area 1 is an area on a virtual memory having contents common to the system, and is an area where each module of the operating system (O8) is loaded. The individual user area 2 is an area having unique contents for each virtual space, and is an area where user-compatible modules such as application programs are loaded.

The virtual address of O3 space 3 in system area 1 is:
It is fixedly determined in advance and is shared by each virtual memory. The SVC handler 4 is a routine to which control is transferred by a so-called SVC interrupt and starts a processing section for each SVC instruction. The program management section 5 controls programs executed on the virtual memory, and executes program loading or erasing, program usage permission control, dynamic link control, and the like. In the case of the present invention, for example, the following processing units are provided.

The entry point address determination unit 6 determines whether the required entrance irradiation temperature specified in the system macro instruction related to inter-program control transition has been changed to the entrance point address. The requested entrance irradiation temperature is prepared in the system macro instruction parameter in a left-justified manner, so whether the first byte is a character or not, it must not have been changed to the entrance point address, or it must have been previously It is possible to determine whether it has been changed.

The JPA-CDE search unit 7 searches the entry control table (CDE) in the so-called job pack area (JPA).
) 16 and executes processing to determine whether the module to which control is to be transferred is already prepared on the virtual memory and is in an executable state. The ISP check unit 8 refers to the entry control table 16 found by the JPA-CDE search unit 7, and checks the ISP (in-storage) assigned to the program package in which the module to which control is to be transferred is made resident. pro
gram package) space.

When the information regarding the module to which control is to be transferred is not yet prepared on the virtual memory, the library search unit 9 performs
It searches task libraries, link back areas, and link libraries and extracts information about the program.

The CDE creation unit 10 performs a process of securing an area for an entry control table 16 as shown in FIG. 2, for example. The entry system '411+ table 16 includes module head address information, entrance point address information for the entrance point person, and entrance illumination temperature information.

Pointer information for the next entry control table 16,
Usage count information and other various flag information are set. Among these flags, there is a flag CDE indicating whether the module in question is allocated within the ISP.
There is an ISP.

The program fetch unit 11 executes processing such as access to a program based on information regarding the program found by the library search unit 9. The connection processing unit 12 is.

Information is set in the entry control table 16.

It performs dynamic connection control between a request source and a request destination.

The ISP residency section 13 executes a process of loading the contents of a predetermined resident program package into the ISP space 15 and making it resident on the virtual memory 2, for example, at the time of initial setting of the system.

The user space 14 in the individual user area 2 is as follows.

Separate virtual storage space allocated for each job correspondence. The ISP space 15 is a space prepared for resident program packages, and modules assigned to this space always have fixed addresses so that their entry point addresses will not change. It has become. Since the control regarding this ISP is well known, the explanation will be limited to this extent.

Next, the processing operation of the embodiment shown in FIG. 1 will be explained with reference to FIG.

Examples of system macro instructions related to control transfer between programs include LINK, XCTL, LOAD, and DEL.
There are macro instructions such as ETE, each with SVC number r6
J, SVC number r7J, SVC number r8J, and SVC number "9" are assigned. Normally, in the S C command related to these SVC numbers, for example, an 8-byte entrance illumination temperature storage area 20 is provided corresponding to the SVC command, and the artificial illumination temperature of the program to which control is to be transferred is specified in this storage area. It has become.

For example, in the user space 14 or the ISP space 15,
When the SC command related to the inter-program control transfer is issued, the SVC handler 4 calls the program management section 5. In the program management section 5, the entrance point address determination section 6 first determines whether the entrance point person of the entrance temperature storage area 20 specified by the SvC command has been changed to the entrance point address. If it has been changed to the entry point address, it means that the connect processing has already been completed, and therefore the "post-processing j" according to the linkage interface is executed and the processing of the macro instruction is ended.

If the SVC instruction issued is the first one,
Since the entrance black hair is still set in the entrance illumination temperature storage area 20, the JPA-CDE search unit 7 searches the entry control table 16 in the job pack area for the entry having the entrance black hair. Search control table 16. If this is the first control transfer in the job pack area, the entry control table 16 with that entry black hair does not exist, and on the other hand, control has already been transferred by another SVC command in the same job pack area. If so, the entry control table 16 will be found.

If the corresponding entry control table 16 is not found, by the library search unit 9.

Search task libraries, link pack areas, and link libraries. Then, the CDE creation unit 10 creates the entry control table 16.

Next, the program fetch section 11 is activated, and the program fetch section 11 causes the connection processing section 12 to execute a connection process. If the connect process fails, the input/output is activated by the well-known EXCP macro instruction and the program is loaded.

Thereafter, it is determined whether the requested inlet illumination temperature exists within the same ISP as the request source. Then, when it exists in the same rSP, the requested entrance illumination temperature of the entrance illumination temperature storage area 20 is set to the ISP.
Convert to the entry point address in space 15. From then on,
Every time this macro instruction is issued from this program,
Using the entry point address stored in the entry point storage area 20, control is passed directly to the called destination (in the case of the LOAD macro instruction, the calling source).

When the processing by the program fetch unit 11 is completed, according to the standard linkage interface, set the return address in 1, for example, general-purpose register (R14), set the entry point address in general-purpose register (R15), and set the return address in general-purpose register (R15). Execute "post-processing" to set the value at the time of the call.

With the entrance black hair not changed to the address.

When the entry control tail 16 is searched for the entrance black hair, if the corresponding entry control table 16 is found, the ISP check unit 8 checks whether the second illustrated flag CDEISP in the entry control table 16 is on. Check whether or not. In addition, this flag CD
EISP is turned on when the callee is a program resident in the ISP space 15. Then, the flag CDEISP is on.

And when the requested population illumination temperature exists in the same ISP as the request source, the requested entrance illumination temperature in the entrance illumination temperature storage area 20 is rewritten to the entrance point address.

Once the requested entrance irradiation temperature has been rewritten to the entrance point address, "post-processing" according to the standard linkage interface is executed and control is transferred. If the module in which the request entry point resides is not assigned to the ISP space 15,
If the request entry point does not exist within the same ISP, the address of the request entry point is undefined, so the attribute information set in the entry control table 16 is referred to, and the same control as before is performed. Execute the delivery process.

〔Effect of the invention〕

As explained above, according to the present invention, it is now possible to directly transfer control even for programs that operate in so-called regions. number.

For example, it can be reduced to several hundred steps. Therefore, it is no longer necessary to place job-compatible modules that require performance-based emphasis on the system area, and the pressure on virtual space on individual user areas due to the expansion of the system area can be reduced. .

[Brief explanation of drawings]

FIG. 1 shows the configuration of an embodiment of the present invention, FIG. 2 is an explanatory diagram of an entry control table, and FIG. 3 is an explanatory diagram of processing according to the embodiment shown in FIG. In the figure, 1 is a system area, and 2 is an individual user area. 3 is O3 space, 4 is SVC handler, 5 is program management section, 6 is entry point address determination section, 7 is JPA-CDE
Search section, 8 is ISP check section. 9 is the library research department, and 10 is the CDE creation department. 11 is a program fetch section, 12 is a connection processing section,
13 is an ISP resident unit, and 14 is a user space. 15 represents an ISP space, and 16 represents an entry control table. Patent applicant: Fujitsu Ltd. Representative Patent Attorney Mori 1) Hiroshi (1 other person); +1 sword

Claims (1)

[Claims] Handling control transfer between programs packaged and resident in virtual memory - In the inter-program control transfer processing method, the request entry point name in the system macro instruction related to inter-program control transfer is changed to the entry point address. means for determining whether or not the
When the determination means determines that the request entry point name has not been changed to the entry point address, the request entry point name is in the same resident program package as the control transfer request source. means for changing the request entry point name to the entry point address of the request entry point and then executing processing related to control transfer; and when the judgment means determines that the request entry point name has been changed to the entry point address, the entry point address; 1. A control transfer processing method between programs, comprising: means for executing processing related to control transfer to a program.