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May 15th, 2015
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This document will give you all the guideline needed to take repair to the vehicle and it will ensure that the vehicles are repaired and it is an engineering document

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Reverse Engineering of Real-Time Assembly CodeJens PalsbergMatthew WallacePurdue UniversityDept. of Computer ScienceWest Lafayette, IN 47907{palsberg,wallacms}@cs.purdue.eduAbstractMuch legacy real-time code is written in assembly language. Such code is oftencrafted to meet stringent time and space requirements so the high-level intent of theprogrammer may have been obscured. The result is code that is difficult to maintainand reuse. In this paper we present a tool for reverse engineering of real-time Z86assembly code, together with a tool for validation of the output. Our experimentalresults are for a suite of commercial microcontrollers. For those benchmarks, our tooldoes the bulk of the reverse-engineering work, leaving just a few undisciplined uses ofmachine code to be handled manually. Our tool is designed to preserve programmerintent to the largest extent possible. Thus, the reverse engineered program is easier tounderstand and maintain than the original.11.1IntroductionBackgroundIn most embedded systems, resource constraints play an important role. This is usually dueto economic considerations that may dictate the use of a cheap and impoverished processor.Constraints on time, space, power, etc., can make it challenging to implement the desiredfunctionality. For example, it may be required that the handling of a certain event terminateswithin one millisecond. If the event handler is programmed in C, then the programmer isat the mercy of the

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