the features and functions of machine code, assembly code, and source code

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source code

Machine code, assembly code, and source code of chip programs are often confusing concepts. Today, we mainly introduce the characteristics and general functions of these types of codes.

Machine code, as the name suggests, is a type of code that works on a single chip and can be recognized and run. Common formats include binary BIN format, decimal HEX format, and so on. Simply put, it is a combination of high and low levels that is easy for the machine to recognize. Each microcontroller has a state analysis circuit that can analyze the meaning of each machine code to drive the microcontroller to run. The advantage of machine code is that the storage is generally small, which is convenient for single-chip identification. The disadvantage is also obvious that people cannot read and directly modify the function.

The concept of assembly code is a machine-oriented programming language. In assembly language, mnemonic symbols are used instead of opcodes, labels or address symbols are used instead of address codes, symbols are used instead of machine codes, and machine language is converted into easily readable assembly. language, also known as symbolic language. The readability mentioned here is only available to professionals who are familiar with programming. If it is necessary to perform more complex reverse engineering function analysis and modification, registration code search, vulnerability analysis, etc., it is usually difficult to complete, so in the field of reverse engineering, it is necessary to elicit Another code-source concept.

Source code, also known as source program, is a human-readable and modifiable computer language. Source code is the usual development code of our technicians. It is usually implemented in C language, JAVA language, PYTHON language and other tools, of which C language is everyone The most widely used and most familiar tool. The benefits of owning the source code are self-evident. It can be read immediately (professionals) and can be modified arbitrarily. In the field of reverse engineering, mastering the source code means mastering the ownership of the program.

In recent years, due to the continuous optimization of product performance by customers, more and more customers need to disassemble machine code or even anti-C source code to modify and upgrade product functions. In essence, complete anti-C code is basically impossible to achieve. , but we can use the machine code to disassemble the operation, and then use the assembly code to perform the anti-C operation to obtain a pseudo-C code, but the workload is huge, so the general cost is high. The source code obtained in this way is also readable by technical engineers, and it is much simpler to modify and upgrade the program if necessary. At present, we have done many related cases for our customers and have rich experience and strength.

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Aidan Taylor
Aidan Taylor

I am Aidan Taylor and I have over 10 years of experience in the field of PCB Reverse Engineering, PCB design and IC Unlock.

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