In x86 Assembly Language:
Develop a program that uses four signed, global, short variables A, B, C, D
Initialize each variable A, B, C, D to a different positive one-digit value
Somehow print the four values in order A B C D, space separated
Print a newline character
Reorder the values in the variables from the order A, B, C, D to B, C, D, A
Somehow print the four values in order A B C D, space separated
;How to run:
;> nasm -felf32 <filename>.asm
;> gcc -m32 <filename>.o
;> ./a.out
section .data
;declare four signed global variables A, B, C, D
;and initialize them with values 4, 7, 1, 5
respectively
A dw 4
B dw 7
C dw 1
D dw 5
;%d format for printf function for printing
variables
var_format db " %d ",0
;newline character(10) for printing newline
newline_format db 10,0
section .text
global main
extern printf
main:
;print A, B, C, D values
call print_ABCD
;print newline character
call print_newline
;copy values of A, B, C, D to registers ax, bx, cx, dx
respectively
mov ax, word[A]
mov bx, word[B]
mov cx, word[C]
mov dx, word[D]
;A -> B
mov word[B], ax
;B -> C
mov word[C], bx
;C -> D
mov word[D], cx
;D -> A
mov word[A], dx
;print all A, B, C, D values
call print_ABCD
;print newline
call print_newline
ret
print_ABCD:
;save previous stack pointer
push ebp
mov ebp, esp
;print A
pusha
xor eax, eax
mov ax, word[A]
push eax
push var_format
call printf
add esp, 8
popa
;print B
pusha
xor eax, eax
mov ax, word[B]
push eax
push var_format
call printf
add esp, 8
popa
;print C
pusha
xor eax, eax
mov ax, word[C]
push eax
push var_format
call printf
add esp, 8
popa
;print D
pusha
xor eax, eax
mov ax, word[D]
push eax
push var_format
call printf
add esp, 8
popa
mov esp, ebp
pop ebp
ret
print_newline:
;save previous stack pointer
push ebp
mov ebp, esp
;print newline character
pusha
push newline_format
call printf
add esp, 4
popa
mov esp, ebp
pop ebp
ret
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