JPH0640312B2 - Program interface method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a calling method between execution program procedures in a computer system, and more particularly to a program interface method between procedures having different instruction sets.

〔Overview〕

According to the present invention, in a program interface method between procedures having different instruction sets in a computer system, when one procedure calls another procedure, after converting the instruction set to another instruction set, another procedure is called, Even if control is returned from the procedure of step 1, the control processing is performed after converting the instruction set, so that the calling process between procedures of different instruction sets can be executed with a small overhead and a high degree of freedom. It was done like this.

[Conventional technology]

Conventionally, in a computer system having two or more instruction sets of this kind, as shown in FIG. 3, the calling means 3 is used between the steps 301 and 303 of the same instruction set.
The call by 02 and the return of the control by the return means 304 were performed. Further, as shown in FIG. 4, between the steps 401 and 404 having different instruction sets 406 and 407, the system program is executed by the interrupt 402 of the calling side procedure 401.
403 is called and the called procedure 404 is activated, and the termination of the procedure 404 is notified to the system program 403 by the interrupt 405, and the procedure 401 is restarted.

[Problems to be solved by the invention]

In the above-mentioned program interface method in the computer system, it is impossible to call between procedures having different instruction sets without intervention of the system program, so that the overhead of the system program is large and the degree of freedom of parameter passing method is limited. was there.

The object of the present invention is to eliminate the above-mentioned drawbacks, so that the calling process between procedures having different instruction sets can be executed with a small overhead and a high degree of freedom, and the instruction set can be switched by the user program. , It is to provide a program interface method that can not only execute the entire system as it is, but also partially execute a user program.

[Means for solving problems]

The present invention calls from the first procedure another second procedure of an instruction set having an address format different from the first procedure,
In a program interface method in a computer system for returning control from the called second procedure to the first procedure called, the instruction set of the first procedure and the instruction set of the second procedure are provided, There is provided interface means for starting the execution of the processing by the calling means of the first procedure and the returning means of the second procedure, which interface means is based on the address length of the instruction set of the first procedure. First instruction set switching means for switching to the address length of the second procedure; calling means for calling the second procedure with the instruction set of the second procedure switched by the first instruction set switching means; Second, the address length of the instruction set of the second procedure is switched to the instruction set of the address length of the first procedure And instruction sets switching means, characterized in that the control by the instruction set of the second first procedure is switched by the instruction set switching means includes a return means returning to the first step.

[Action]

According to the present invention, when one procedure calls another procedure of a different instruction set, after converting the instruction set to another instruction set, the other procedure is called, and control is returned from the other procedure to another procedure of the calling side. In some cases, control may be returned to the original procedure after converting the instruction set to the original instruction set. Therefore, unlike the prior art, it is possible to perform a calling process between procedures having different instruction sets without requiring a system program.

〔Example〕

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

FIG. 1 is a block diagram showing an embodiment of the present invention. Instruction set 101 A first procedure 102 consisting of calling the interface means 104 by the calling means 103. The interface means 104 seen from the first procedure 102 is a procedure consisting of the same instruction set 101. The interface means 104 switches by the instruction set switching means 105 to an instruction set 106 (⇒ indicates the continuation of the instruction) different from the one being executed. Instruction fetch after execution of instruction set switching means 105
It is performed from the next address of the instruction set switching means 105.
Next, the interface means 104 calls the second procedure 108 by the calling means 107. The interface means 104 seen from the second procedure 108 is a procedure consisting of the same instruction set 106. In the second procedure 108, when the processing is completed, the return means 109 returns the control to the interface means 104. The interface means 104 switches to the instruction set 101 by the instruction set switching means 110 and then returns the control to the first procedure 102 by the returning means 111. Here, the instruction set switching means 105 belongs to the instruction set 101, and the instruction set switching means 110 belongs to the instruction set 106, and each has a reverse function. According to the above processing, the first procedure 102
Can be considered to be the same as the second procedure 108 consisting of different instruction sets being called by the calling means 103.

The feature of the present invention is that the interface means in FIG.
According to 104, after the different instruction set is converted into the destination instruction set, the calling and the control are returned.

FIGS. 2A and 2B are explanatory views showing an example of the instruction set switching means of FIG. 1 in the instruction sets having different address formats. It is assumed that the instruction set switching means 206 belonging to the instruction set having the address space A204 has switched to the instruction set having the address space B205. The next instruction 207 of the instruction set switching means 206 is shown in FIG.
As shown in, the address space A204 has an address of A'201 ', and the address space B205 has an address of B'202'. Assuming that the position of the address space B205 on the address space A204 is C'203 ', A'201' is a combination of B'202 'and C'203', as shown in FIG. , By adjusting the value of C'203 ',
The address format can have a relationship such as A201, B202 and C203 as shown in FIG. Therefore,
It is possible to easily obtain A202 from B201 by the instruction set switching means 206, and it is possible to switch the instruction sets between the instruction sets having different address formats by the processing. Address space B205
When switching from the instruction set of A to the instruction set of the address space A204, A201 is obtained by adding a predetermined C203 to B202. Here, at least the instruction set switching means 206 and the next instruction 207 must be in both the address space A204 and the address space B205.

Here, the instruction set A and the instruction set B are shown in FIG.
As shown in (a), the instructions have different lengths of operands indicating addresses. In order to switch such an instruction set, the address length of the instruction read from the memory is switched by the instruction of the instruction set switching means 105, 110 to obtain the final execution address. To obtain the execution address, the instruction set switching device for switching the address length may be controlled by the instruction set switching instruction. FIG. 5 (b) shows an example of the configuration for obtaining the execution address by the instruction set switching device at this time. At this time, it is determined whether the length of the instruction on the memory is, for example, 24 bits or 32 bits.

〔The invention's effect〕

As described above, according to the present invention, by providing the procedure of the program interface for switching the instruction set, it is possible to execute the calling process between the procedures having different instruction sets with a small overhead and a high degree of freedom. effective.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention. 2 (a) and 2 (b) are explanatory views of an example of the instruction set switching means of FIG. FIG. 3 is a block diagram showing a first conventional example. FIG. 4 is a block diagram showing a second conventional example. FIG. 5 is a diagram for explaining an example of instruction set switching according to the embodiment of the present invention. 101, 106 ... Continuation of instructions of each instruction set, 102 ... First procedure, 103, 107 ... Calling means, 104 ... Interface means, 105, 110 ... Instruction set switching means, 108 ...
Second procedure, 109, 111 ... Returning means, 201, 201 '... Address A, A', 202, 202 '... Address B, B', 203, 2
03 '... address C, C', 204 ... address space A, 2
05 ... address space B, 206 ... instruction set switching means, 207 ... next instruction, 301, 303, 401, 404 ... procedure, 302
...... Calling means, 304 ...... Returning means, 402 …… Call interruption, 403 …… System program, 405 …… Return interruption, 406, 407 …… Continuation of instructions.

Claims (1)

[Claims] 1. The first procedure calls another second procedure of an instruction set having an address format different from that of the first procedure, and the second procedure called from the second procedure called to the first procedure called. A program interface method in a computer system for returning control, comprising an instruction set of the first procedure and an instruction set of each of the second procedure, and calling means of the first procedure and returning means of the second procedure. Interface means for starting the execution of the processing by means of the interface means.
First instruction set switching means for switching to the address length of the second procedure, calling means for calling the second procedure with the instruction set of the second procedure switched by the first instruction set switching means, and the second instruction set switching means. From the address length of the instruction set of the procedure
Second instruction set switching means for switching to the instruction set having the address length of the procedure of 1. and returning means for returning the control to the first procedure by the instruction set of the first procedure switched by the second instruction set switching means. A program interface method characterized by including and.