Question

Write instructions in assembly language to copy 25 words of data segment memory addressed by SRC into an area of memory addressed by DST.

Answer 1

Below is instructions in x86 assembly code using NASM syntax to copy 25 words of data from the source (SRC) to the destination (DST), assuming a 32-bit x86 architecture:

section .data

SRC dd 0x1000 ; Example source address (change as needed)

DST dd 0x2000 ; Example destination address (change as needed)

SIZE equ 25 ; Number of words to copy

section .text

global _start

_start:

mov esi, SRC ; Source address

mov edi, DST ; Destination address

mov ecx, SIZE ; Counter for the loop

copy_loop:

mov eax, [esi] ; Load a word from the source

mov [edi], eax ; Store the word to the destination

add esi, 4 ; Move to the next word in the source (assuming 4 bytes per word)

add edi, 4 ; Move to the next word in the destination

loop copy_loop ; Repeat the loop until ecx becomes zero

; Exit the program or add more code here as needed

section .bss

; Add any uninitialized data here if necessary

Adjust the code as needed.