JPH04332053A - Cpu simulator - Google Patents

Abstract

PURPOSE:To improve operability by continuing simulation in quite the same environment as that of CPU simulation end without recording or resetting a new environment by a user. CONSTITUTION:The contents of a simulation memory 11 and a register flag buffer 12 which are changed by executing a simulation part 21 are written and stored in a file 3 by executing a memory/environment storing part 22. The contents of the file 3 are read out and the states of the memory 11 and the buffer 12 are restored by executing a memory/environment restoring part 23.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CPU simulator for simulating a CPU.

0002

[Prior Art] Conventionally, this type of CPU simulator is
It is equipped with a means for saving the contents of the memory resulting from the simulation in a file, and a means for reading and restoring the contents of the memory saved in the file, and by saving the state of a certain memory in a file, subsequent simulation operations can be performed. It is configured such that the saved memory state can be restored at any time.

0003

[Problems to be Solved by the Invention] However, although the conventional CPU simulator described above can restore the memory state, it is not possible to restore the environment such as registers and flags whose states change according to the simulation. There was a problem in that the user had to record and reconfigure the environment, resulting in poor operability.

[0004] The present invention solves these conventional problems, and allows the user to continue the simulation in exactly the same environment as the one at the end of the CPU simulation, without the user having to record or reconfigure the environment. A CPU that enables improved operability
The purpose is to provide a simulator.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides means for saving in a file the state of memory as a result of simulation and the environment in which the state changes according to the simulation, and It is equipped with means for reading the saved contents and restoring the environment in which the state changes according to the memory state and simulation.

[0006]

[Operation] Therefore, according to the present invention, the memory state and the environment in which the state changes according to the simulation are saved in a file during the simulation, and when the CPU simulator is started again after the execution of the CPU simulator is finished, Since the memory state and environment saved in a file can be read and restored, the user can continue the simulation in exactly the same environment as when the CPU simulator ended, without having to record or reconfigure the environment. Can be done.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic block diagram showing the configuration of a CPU simulator in one embodiment of the present invention.

In FIG. 1, 1 is a data area of the CPU simulator, 2 is a program area of the CPU simulator, and 3 is a file. The data area 1 includes a simulation memory 11 in which the memory state of the CPU performing the simulation is written, and a register/flag buffer 12 in which the contents of registers and flags are written. The program area 2 includes a simulation section 21 that performs simulation, a memory/environment storage section 22 that saves the memory state, register and flag states in a file 3, and a memory/environment storage section 22 that reads out the contents saved in the file 3 and saves the memory state and registers. Memory/environment restoration unit 23 that restores the flag state
It is equipped with

The operation of the above configuration will be explained below. The simulation memory 11 and register/flag buffer 12 in the data area 1 are used when the simulation section 21 in the program area 2 is executed.
By performing a simulation, the state is changed by reading and writing. When executing the memory/environment storage unit 22 in the program area 2, the simulation memory 11 in the data area 1 and the register/flag buffer 1
Convert the contents of 2 into the specified format and write it to file 3. Memory/environment restoration unit 23 of program area 2
When executing, the contents of file 3 are read and the simulation memory 11 and registers in data area 1 are
The read contents are written into the flag buffer 12.

As described above, according to the above embodiment, the simulation memory 11 and the register/flag buffer 1 are changed by executing the simulation section 21.
By executing the memory/environment storage unit 22, the contents of 2 are written to file 3 and saved, and by executing the memory/environment restoration unit 23, file 3 is read and saved for the simulation memory 11 and registers/flags. The state of buffer 12 can be restored.

0012

[Effects of the Invention] As explained above, according to the present invention, C
A means to save the memory state as a result of PU simulation and the environment where the state changes according to the simulation in a file, and read the contents saved in the file to restore the memory state and the environment where the state changes according to the simulation. The memory state and transition environment are saved in a file during the simulation, and after the execution of the CPU simulator is finished, the memory status and transition environment are saved in a file.
When the CPU simulator is started, the memory state and environment saved in the file can be read and restored, so the user does not have to record or reconfigure the environment, and the CPU simulation is exactly the same as when the CPU simulation ended. The simulation can continue in this environment. Therefore, operability can be improved.

[Brief explanation of the drawing]

FIG. 1: Schematic block diagram of a CPU simulator in an embodiment of the present invention

[Explanation of symbols]

1 CPU simulator data area 2 CPU simulator program area 3 File 11 Simulation memory 12 Register/flag buffer 21 Simulation section 22 Memory/environment storage section 23 Memory/environment restoration section

Claims (1)

[Claims] 1. A means for saving in a file a memory state as a result of a CPU simulation and an environment in which the state changes according to the simulation, and a means for reading out the contents saved in the file and changing the state according to the memory state and the simulation. A CPU simulator comprising means for restoring a transitional environment.