lab5.lst

     1                                  bits 32 ; assembling for the 32 bits architecture
     2                                  
     3                                  ; declare the EntryPoint (a label defining the very first instruction of the program)
     4                                  global start        
     5                                  
     6                                  ; declare external functions needed by our program
     7                                  extern exit,printf               ; tell nasm that exit exists even if we won't be defining it
     8                                  import exit msvcrt.dll    ; exit is a function that ends the calling process. It is defined in msvcrt.dll
     9                                                            ; msvcrt.dll contains exit, printf and all the other important C-runtime specific functions
    10                                  import printf msvcrt.dll
    11                                  ; our data is declared here (the variables needed by our program)
    12                                  segment data use32 class=data
    13                                      ; ...
    14                                  
    15                                  ; our code starts here
    16                                  segment code use32 class=code
    17                                      start:
    18                                          ; ...
    19 00000000 6A21                            push 33
    20 00000002 E8(00000000)                    call printf
    21 00000007 83C404                          add esp , 4
    22                                          ; exit(0)
    23 0000000A 6A00                            push    dword 0      ; push the parameter for exit onto the stack
    24 0000000C FF15[00000000]                  call    [exit]       ; call exit to terminate the program