assembly_tutorial

Recommendations

Info

Creating and Opening a File .................................................................... 75 Opening an Existing File .......................................................................... 75 Reading from a File .................................................................................. 75 Writing to a File ........................................................................................ 76 Closing a File ........................................................................................... 76 Updating a File ......................................................................................... 76 Example: .................................................................................................. 77 Memory Management ............................................................ 79 Example: .................................................................................................. 79 TUTORIALS POINT Simply Easy Learning
CHAPTER 1 Assembly Introduction What is Assembly Language? Each personal computer has a microprocessor that manages the computer's arithmetical, logical and control activities. Each family of processors has its own set of instructions for handling various operations like getting input from keyboard, displaying information on screen and performing various other jobs. These set of instructions are called 'machine language instruction'. Processor understands only machine language instructions which are strings of 1s and 0s. However machine language is too obscure and complex for using in software development. So the low level assembly language is designed for a specific family of processors that represents various instructions in symbolic code and a more understandable form. Advantages of Assembly Language An understanding of assembly language provides knowledge of: Interface of programs with OS, processor and BIOS; Representation of data in memory and other external devices; How processor accesses and executes instruction; How instructions accesses and process data; How a program access external devices. Other advantages of using assembly language are: It requires less memory and execution time; It allows hardware-specific complex jobs in an easier way; It is suitable for time-critical jobs; TUTORIALS POINT Simply Easy Learning
Page 1 and 2: Assembly Language Tutorial
Page 3 and 4: ABOUT THE TUTORIAL Assembly Program
Page 5 and 6: Table of Content Assembly Programmi
Page 7: The XOR Instruction ...............
Page 11 and 12: Main use of hexadecimal numbers in
Page 13 and 14: x: memory address When the processo
Page 15 and 16: Check The netwide assembler (NASM)
Page 17 and 18: ; This program displays a message o
Page 19 and 20: CHAPTER 4 Assembly Memory Segments
Page 21 and 22: CHAPTER 5 Assembly Registers Proces
Page 23 and 24: Control Registers The 32-bit instru
Page 25 and 26: CHAPTER 6 Assembly System Calls Sys
Page 27 and 28: Please enter a number: 1234 You hav
Page 29 and 30: Direct Memory Addressing When opera
Page 31 and 32: int 0x80 ;call kernel mov eax,1 ;sy
Page 33 and 34: Processor uses the little-endian by
Page 35 and 36: CHAPTER 9 Assembly Constants There
Page 37 and 38: The above code replaces PTR by [EBP
Page 39 and 40: dec [value] mov ebx, count inc word
Page 41 and 42: int 0x80 When the above code is com
Page 43 and 44: global main ;must be declared for u
Page 45 and 46: mov [res], ax mov ecx,msg mov edx,
Page 47 and 48: AND AL, 01H ; ANDing with 0000 0001
Page 49 and 50: The TEST Instruction The TEST instr
Page 51 and 52: L7: ... CMP is often used for compa
Page 53 and 54: jg _exit mov ecx, [num3] _exit: mov
Page 55 and 56: section .bss num resb 1 mov ecx, nu
Page 57 and 58: Such conversions are however, has a
Page 59 and 60:
mov ecx,msg ;message to write mov e
Page 61 and 62:
LODS - This instruction loads from
Page 63 and 64:
mov ecx, len mov esi, s1 mov edi, s
Page 65 and 66:
found! Repetition Prefixes The REP
Page 67 and 68:
Example: The following example demo
Page 69 and 70:
mov ecx, res mov edx, 1 mov ebx, 1
Page 71 and 72:
CHAPTER 18 Assembly Recursion Arecu
Page 73 and 74:
CHAPTER 19 Assembly Macros Writing
Page 75 and 76:
CHAPTER 20 Assembly File Management
Page 77 and 78:
Put the buffer size, i.e., the numb
Page 79 and 80:
int 0x80 ;call kernel section .data
Page 81:
mov eax, 1 xor ebx, ebx int 80h sec
show all

assembly_tutorial

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?