lab8.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, fclose, fopen, fprintf , fread , 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 fopen msvcrt.dll  
    11                                  import fclose msvcrt.dll
    12                                  import fprintf msvcrt.dll
    13                                  import printf msvcrt.dll
    14                                  import fread msvcrt.dll
    15                                  
    16                                  ; our data is declared here (the variables needed by our program)
    17                                  segment data use32 class=data
    18                                      ; ...
    19 00000000 746573742E74787400          nume_fisier db "test.txt", 0 ; numele fisierului care va fi creat
    20 00000009 612B00                      mod_acces db "a+", 0                                            
    21 0000000C FFFFFFFF                    descriptor_fis dd -1; aici vom salva descriptorul fisierului - necesar pt a putea face referire la fisier
    22                                      len equ 100                                     
    23 00000010 00<rept>                    text times (len+1) db 0 
    24 00000075 416D20636974697420-         format db "Am citit %d caractere din fisier. Textul este: %s",0
    24 0000007E 256420636172616374-
    24 00000087 6572652064696E2066-
    24 00000090 69736965722E205465-
    24 00000099 7874756C2065737465-
    24 000000A2 3A20257300         
    25                                  ; our code starts here
    26                                  segment code use32 class=code
    27                                      start:
    28                                          ; ...
    29                                         
    30                                          
    31 00000000 68[09000000]                    push dword mod_acces     
    32 00000005 68[00000000]                    push dword nume_fisier
    33 0000000A FF15[00000000]                  call [fopen]   	; returneaza in EAX - descriptorul de fisier
    34 00000010 83C408                          add esp, 4*2       
    35                                          
    36 00000013 A3[0C000000]                    mov [descriptor_fis], eax
    37                                          
    38 00000018 FF35[0C000000]                  push dword [descriptor_fis]
    39 0000001E 6A64                            push dword len
    40 00000020 6A01                            push dword 1
    41 00000022 68[10000000]                    push dword text        
    42 00000027 FF15[00000000]                  call [fread]
    43 0000002D 83C410                          add esp, 4*4
    44                                  
    45 00000030 68[10000000]                    push dword text
    46 00000035 50                              push dword eax
    47                                          
    48 00000036 68[75000000]                    push dword format
    49 0000003B FF15[00000000]                  call [printf]
    50                                          
    51 00000041 FF35[0C000000]                  push dword [descriptor_fis]
    52 00000047 FF15[00000000]                  call [fclose]
    53 0000004D 83C404                          add esp, 4
    54                                  
    55                                          ; exit(0)
    56 00000050 6A00                            push    dword 0      ; push the parameter for exit onto the stack    
    57 00000052 FF15[00000000]                  call    [exit]       ; call exit to terminate the program