Need help in assembly Thank you Implement the following expr

Implement the following expression in assembly language: EAX = -val2 + 7 -val3 + val1 Assume that val1, val2, and val3 are 16-bit integer variables Submit the following: Lastname2.asm

Solution

val1 dw 0202h
val2 dw 100h
val3 dw 200h
segment .bss
sum resb 1
section   .text
global _start ;must be declared for using gcc
  
_start:   ;tell linker entry point

mov eax,[val2]
imul eax,\'-1\'
add eax,\'7\'
sub eax,[val3]
add eax,[val1]

mov [sum],eax
  
mov ecx,sum
mov edx, 1
mov ebx,1 ;file descriptor (stdout)
mov eax,4 ;system call number (sys_write)
int 0x80 ;call kernel

mov eax,1 ;system call number (sys_exit)
int 0x80 ;call kernel

;nasm -f elf hello.asm
;ld -m elf_i386 -o hello hello.o

=====================================================================

Output:

akshay@akshay-Inspiron-3537:~/Chegg$ nasm -f elf hello.asm
akshay@akshay-Inspiron-3537:~/Chegg$ ld -m elf_i386 -o hello hello.o
akshay@akshay-Inspiron-3537:~/Chegg$ ./hello
9