Method and device for grabbing branch instructions based on fast emulator qemu

Abstract

The invention provides a method and device for capturing branch instructions based on a fast emulator QEMU. The method for grabbing branch instructions based on the fast emulator QEMU provided by the present invention includes: when QEMU executes and obtains instructions to be translated, it is judged whether the currently obtained instruction to be translated is a branch instruction, and if so, then according to the target program architecture, the current The branch instruction executes the translation operation, obtains the translated branch instruction, and stores the attribute information of the above branch instruction; wherein, the attribute information of the above branch instruction includes the operation code of the above branch instruction, the instruction address of the above branch instruction and the jump of the above branch instruction Forward address. The method and device for capturing branch instructions based on the fast emulator QEMU provided by the present invention can capture branch instructions in execution programs of different processor architectures, with high compatibility and low cost.

Description

technical field [0001] The invention relates to computer technology, in particular to a method and device for capturing branch instructions based on a fast emulator QEMU. Background technique [0002] The branch predictor is a key component of the central processing unit (Central Processing Unit, referred to as CPU), which can help the CPU to obtain instructions faster and speed up the operation of the CPU, and the branch instruction set can check the branch instruction predictor before tape-out Verification and testing are performed to determine the performance of the branch predictor and to determine whether branch predictor improvements are required. Therefore, in order to effectively predict the performance of the branch predictor, it is particularly important to capture the branch instructions in the executable program. [0003] In prior art 1, a monitoring circuit is added to the main board of the CPU, and the monitoring circuit is connected to a memory, so that progr...

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Problems solved by technology

[0004] The present invention provides a method and device for capturing branch instructions based on the fast emulator QEMU, so as to solve the problem that the branch instruction capturing method in the prior art can only capture the branch instructions in the execution program of a processor architecture, but cannot The problem of fetching branch instructions in the executive program of other processor architectures

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