간단한 어셈블리 프로그래밍 질문 드립니다

%include "asm_io.inc"
 
        segment .data
prompt1 db      "Enter a number (A) : ", 0      ;
prompt2 db      "Enter a number (B) : ", 0      ; initialized data is put in the data segment here
outmsg1 db      "A X B = ", 0
 
        segment .bss
input1  resb    0
input2  resb    1
result  resb    2
 
 
        segment .text
        global  main
main
        enter   0,0             ; setup stack frame
        pusha
 
        mov     eax, prompt1    ;
        call    print_string    ; code is put in the text segment. Do not modify the code before
        call    read_int        ; or after this comment.
        mov     [input1], eax   ;
        mov     eax, prompt2
        call    print_string
        call    read_int
        mov     [input2], eax
        mov     ecx, [input2]
 
while:
        add     eax, [input1]
        add     [result], eax
        sub     ecx, 1
        JECXZ   while
 
        mov     eax, outmsg1
        call    print_string
        mov     eax, [result]
        call    print_int
        call    print_nl
 
 
        popa
        mov     eax, 0  ; return value
        leave                   ; leave stack frame
        ret