Byte Alignment Definition Byte alignment is a memory layout rule in computer programming where the starting address of data in memory must be a multiple of its own size. One can imagine memory as a series of contiguous small boxes, each of size 1 byte, with each box having a unique address starting from 0: … Read more
Solving Problems for Classmates ——C++ Programming Arrays Hello everyone! After finishing the study of basic content such as variables, statements, and functions, we officially enter the “first advanced level” of C++ programming—arrays. Many students may have heard the saying: “Arrays are the watershed of programming understanding.” Unlike basic knowledge points that are intuitive and easy … Read more
When we first light up the LED on the development board, when the debugger finally captures that elusive timing error, and when the meticulously written driver runs smoothly on real hardware—the joy of that moment is a unique experience familiar to every embedded developer. I still remember starting to build embedded Linux system platforms in … Read more
Memory Layout in Embedded Systems: Designing Compact Apartments in Microcontrollers As an embedded engineer, have you ever wondered how your code settles into the limited memory of a microcontroller after you upload it? Today, we will delve into the layout of embedded programs in microcontroller memory, akin to designing a compact apartment in a limited … Read more
First Interview 1. Interviewer Self-Introduction 2. Self-Introduction Reference Answer 30–60 seconds “four-part format”: Background → Tech Stack → Representative Projects → Quantified Results; 3. Memory Layout of Classes Reference Answer No virtual functions: Object = Order of data members + Alignment padding; when containing a base class, the “base class sub-object” is at the front. … Read more
The size of a structure and its alignment directly affect memory and performance; understanding alignment rules, the reasons for padding, and the behavior of bitfields can help write smaller, more efficient, and portable C code. Memory layout of a structure Why Care About the Memory Layout of Structures • In network protocols, binary files, drivers, … Read more
1. What is a Scatter-Loading File? In embedded development, after the compiler and assembler generate object files (.o) from the source code, the core task of the linker is to combine all object files and library files into a single executable file (such as .axf or .elf). During this process, the linker needs to know … Read more
Introduction In the previous series of blogs, we learned a lot about the practical techniques of calling C++ from C#. In the interoperability development between C# and C++ (P/Invoke, mixed programming, DllImport, etc.), struct alignment is one of the most common pitfalls. Today, we will continue to explore a common pitfall that many encounter when … Read more
Analysis of Linux Program Memory Layout I. Detailed Explanation of Complete Program Memory Layout (Linux x86-64) High Address 0x7FFFFFFFFFFFFF +———————-+ <– Kernel Space Boundary | **Kernel Space** | (Operating System Kernel Code/Data) +———————-+ <– 0x7FFF80000000 | **Stack** | ↓ Grows Downward | – Function Stack Frame | | – Local Variables | | – Return … Read more
Overview of Cross-Language Array Transfer In mixed programming, transferring array data between C/C++ and Assembly Language (HLA) is a common requirement. The key is to understand the differences in how different languages handle arrays and to ensure the correct memory layout and access methods. Basics of Array Transfer between C/C++ and HLA 1. Array Transfer … Read more