Abstract: A program execution control apparatus and a program execution method are provided by which even when a program is rewritten into an illegal program after the first-mentioned program is checked, execution of the rewritten illegal program can be avoided, and also, which can readily confirm that which program has been rewritten in an illegal manner at which time instant. The program execution control apparatus of the present invention is equipped with: a flash memory 101 for storing thereinto a program; a condition detection unit 103 for detecting a check time instant for checking as to whether or not the program is illegal; an illegality check unit 104 for checking as to whether or not the illegal program is present at the check time instant; an execution control unit 105 for controlling as to whether or not the program is executed in response to the check result; and a CPU 102 for executing the program in response to a result of the execution control unit 105.

Abstract: In a multitask execution environment, a debugging device performs debugging setting for rewriting part of original recording content in a memory area shared by at least two tasks, and debugging cancellation for restoring rewritten recording content back to original recording content. The debugging device stores a memory area used by each task, and address information specifying each debugging target task and a respective address. When task switching occurs, if a next task is not a debugging target, recording content at a physical address specified by address information other than that of the next task and within the physical address space range used by the next task is put into a post-debugging cancellation state. If the next task is a debugging target task, in addition to the above processing, recording content at the physical address specified by the address information of the next task is put into a post-debugging setting state.

Abstract: A program execution control apparatus and a program execution method are provided by which even when a program is rewritten into an illegal program after the first-mentioned program is checked, execution of the rewritten illegal program can be avoided, and also, which can readily confirm that which program has been rewritten in an illegal manner at which time instant. The program execution control apparatus of the present invention is equipped with: a flash memory 101 for storing thereinto a program; a condition detection unit 103 for detecting a check time instant for checking as to whether or not the program is illegal; an illegality check unit 104 for checking as to whether or not the illegal program is present at the check time instant; an execution control unit 105 for controlling as to whether or not the program is executed in response to the check result; and a CPU 102 for executing the program in response to a result of the execution control unit 105.

Abstract: In a multitask execution environment, a debugging device performs debugging setting for rewriting part of original recording content in a memory area shared by at least two tasks, and debugging cancellation for restoring rewritten recording content back to original recording content. The debugging device stores a memory area used by each task, and address information specifying each debugging target task and a respective address. When task switching occurs, if a next task is not a debugging target, recording content at a physical address specified by address information other than that of the next task and within the physical address space range used by the next task is put into a post-debugging cancellation state. If the next task is a debugging target task, in addition to the above processing, recording content at the physical address specified by the address information of the next task is put into a post-debugging setting state.

Abstract: A simulation apparatus and a simulation method that are inexpensive, can achieve a higher execution speed and can perform simulation without using a peripheral circuit simulator under the same condition as that in the case of incorporating a program in hardware are provided. The simulation apparatus includes a storing portion that stores a program to be debugged containing a control operation of hardware, a debug support function for supporting the control operation and a debug support function management information, a writing portion that writes an instruction for invoking the debug support function into the program to be debugged based on the debug support function management information, an instruction fetching portion that fetches the instruction from the program to be debugged and, if the fetched instruction is the instruction for invoking the debug support function, fetches an instruction from the debug support function, and an instruction executing portion that executes this fetched instruction.