Emulator with program counter value settable

Abstract

The invention discloses an emulator with the program counter value settable. The emulator comprises an emulation chip, a debugging module and a storage. A user program and data storage area and a monitoring program storage area are arranged inside the storage. The debugging module controls the emulation chip to be in a monitoring mode or in a user mode, and in the monitoring mode, the emulation chip is controlled to execute a program at the position of a corresponding address in the monitoring program storage area, wherein a PC value correcting monitoring program is stored in the monitoring program storage area. When a return statement of the PC value correcting monitoring program is executed, the current PC value automatically becomes an address value stored in a stack. Under the situation that a processor core of the emulation chip does not support PC value instruction writing, the emulator can still provide the debugging function of correcting PC values; the user program debugging efficiency is improved, meanwhile, the dependence of emulation debugging function realization on the functions of the processor core is lowered, the development complexity and the cost of the emulation chip are lowered, and the universality of emulator design is improved.

Description

technical field [0001] The invention relates to a processor chip emulator, in particular to an emulator capable of setting program pointer values. Background technique [0002] There is a user program developed by the user in the processor chip. In the writing and debugging of the user program, the tool used is generally a processor chip emulator. The emulator uses an emulation chip containing various functions of the product processor chip to simulate the working behavior of the product processor chip, which is very close to the product processor chip in terms of function and performance; the emulation chip cooperates with the emulator host to realize the user program Simulation running and various debugging functions. Therefore, emulation chips are generally designed on the basis of product chips. While using almost all functional modules and processor cores of product chips, some modules that are not related to user program debugging, such as security inspection modules,...

AI Technical Summary

Problems solved by technology

This work is very time-consuming and labor-intensive, and if the processor core of the product is a hard core (that is, the chip manufacturer cannot modify it), then it is impossible to modify the processor core design and add instructions to write PC values ​​to make the corresponding emulator and The emulation chip supports the debugging function of modifying the PC value

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