Answered: NASM CODE, modify the code below Write…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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NASM CODE, modify the code below

Write an assembly program for the processor family x86-32 that reads three signed interger numbers from the standard input and writes the greatest of them on the console. Use the C functions scanf and printf for the management of data input and data output.

section .data

msg db "The largest number is: %d", 0xa,0
v1 equ -47
v2 equ 32
v3 equ 21

num1 times 4 db 0
num2 times 4 db 0
num3 times 4 db 0

section .text
extern printf
global main ;must be declared for using gcc

main: ;tell linker entry point

mov dword [num1], v1
mov dword [num2], v2
mov dword [num3], v3

mov ecx, [num1]
cmp ecx, [num2]
jg check_third_num
mov ecx, [num2]

check_third_num:

cmp ecx, [num3]
jg _exit
mov ecx, [num3]

_exit:

;Print the greatest number
push ecx
push msg
call printf

;Exit process
mov eax, 1
int 80h

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