Concept and Function of Macros Macros are an important tool in assembly language for achieving code reuse and modular programming. They allow programmers to define a reusable code template that generates repeated code sequences in a program through simple macro calls. Syntax for Defining Macros In the NASM assembler, macros are defined using<span>%macro</span> and <span>%endmacro</span> … Read more
Overview of Memory Management In assembly language, memory management is the foundation of program execution. The operating system provides various system calls to manage memory, among which <span>sys_brk()</span> is an important system call used to dynamically adjust the size of the program’s data segment. Detailed Explanation of the sys_brk() System Call Function Description <span>sys_brk()</span> system … Read more
Concept of Recursion Recursion is an important technique in programming, referring to a process or function that calls itself directly or indirectly in its definition. Implementing recursion in assembly language requires a deep understanding of stack operations and the function calling mechanism. Types of Recursion 1. Direct Recursion The process calls itself directly 2. Indirect … Read more
In assembly language, the <span>mul</span> instruction is used to perform unsigned multiplication operations. It is one of the basic arithmetic instructions in the x86 architecture, used for handling 8-bit, 16-bit, and 32-bit multiplication operations.<span>mul</span> instruction is characterized by its operands being implicitly specified, with the result stored in fixed registers. Basic Rules of the MUL … Read more
“Assembly Language”, 3rd Edition by Wang Shuang Chapter 13: int Instruction (Page 262) Experiment 13: Writing and Applying Interrupt Routines ———————————— Note: This is the code example and analysis for Experiment 13, Question 2. ———————————– (2) Write and install the int 7cH interrupt routine, which implements the functionality of the loop instruction. Parameters: (cx) = … Read more
1. What is Assembly Language? The only language that computers can truly understand is low-level language, which is specifically used to control hardware. Assembly language is a low-level language that directly describes and controls the operation of the CPU. If you want to understand what the CPU is doing and the steps of code execution, … Read more
✦ • ✦ 1. Why Learn This Course? In the learning path of computer science, assembly language and interface technology are often regarded as “hard nuts to crack”—they are close to the hardware level and conceptually abstract, presenting certain challenges for beginners. However, these two subjects can help us truly understand how computer systems operate. … Read more
“Assembly Language” 3rd Edition by Wang Shuang Chapter 12: Internal Interrupts (Page 251) Experiment 12: Writing the Handler for Interrupt 0 Write the handler for interrupt 0, so that when a division overflow occurs, the string “divide error!” is displayed in the center of the screen, and then return to DOS. Requirements: Carefully track and … Read more
1. Data Transfer Instructions MOV: Transfer word or byte ->>>>>>>>>>>>>>>>>>>>>>>>>>>> CHUAN means transfer MOVSX: Sign extend first, then transfer ->>>>>>>>>>>>>>>>>>>>>> CHUANFHR means transfer sign to any register MOVZX: Zero extend first, then transfer ->>>>>>>>>>>>>>>>>>>>>> CHUANLR means zero extend any register then transfer PUSH: Push word onto stack ->>>>>>>>>>>>>>>>>>>>>> RUZH means push onto stack POP: Pop … Read more
01.Machine Language 👉 Composed directly of 0 and 1 (binary digits), it requires no translation and can be executed directly by computer hardware.🎯Characteristics: Highest execution efficiency, but difficult to write and understand, classified as a low-level language. 02.Assembly Language 👉 Uses mnemonics (such as MOV, ADD) to replace machine instructions, which need to be translated … Read more