Disassembler and simulators
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This document discusses disassemblers/decompilers and simulators. Disassemblers convert machine code into assembly instructions, while decompilers translate machine code into high-level code. Both are used in reverse engineering. Simulators are software tools that simulate hardware and firmware execution without requiring a real target system. They are useful for debugging firmware but lack real-time behavior and may not replicate real-world conditions.
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Disassembler and simulators
- 2. DISASSEMBLER/ DECOMPILER Disassembler is a utility program. Converts machine codes into target specific assembly instructions. Process of converting machine code to assembly code -disassembling. Operation is complementary to assembling.
- 3. CONTD.. Utility program for translating machine code to high level instructions – decompiler. Decompiler performs reverse operation of compiler. They are deployed in reverse engineering. Reverse engineering – process of revealing technology behind working of a product.
- 4. CONTD.. Disassemblers/Decompilers help reverse engineering process by translating embedded firmware into Assembly/high level instructions. Employed in embedded product development to find out the secret behind proprietary products.
- 5. CONTD.. Powerful tools for analyzing the presence of malicious codes. Available as either freeware tools or as commercial tools. They generate a source code which is nearly similar to the original code.
- 6. SIMUALTORS Software tool used for simulating various conditions for checking the functionality of application firmware. Refers to a soft model. They simulate target hardware and firmware execution can be inspected using simulators.
- 7. FEATURES OF SIMULATORS Purely software based. Does not require real target system. Very primitive. Lack of real time behaviour.
- 8. ADVANTAGES No need for original target board IDEs software support simulates CPU of target board. User only needs to know about memory map of various devices. Real hardware not required. Saves development time.
- 9. CONTD.. Simulate I/O peripherals Provides option to simulate various i/o peripherals. Eliminates the need of connecting i/o devices for debugging the firmware, Simulates abnormal conditions Control flow of firmware can be observed by having any desired input for any parameter during debugging.
- 10. LIMITATIONS Deviation from real behaviour Developer may not be able to debug firmware under all possible combinations of input. Result may not be same when the firmware runs in production environment. Lack of real timeliness Debugging is developer driven. No way of capable of creating real time behaviour.