1                                  ; loopint.asm  code loopint.c for nasm 
     2                                  ; /* loopint.c a very simple loop that will be coded for nasm */
     3                                  ; #include <stdio.h>
     4                                  ; int main()
     5                                  ; {
     6                                  ;   int dd1[100];
     7                                  ;   int i;
     8                                  ;   dd1[0]=5; /* be sure loop stays 1..98 */
     9                                  ;   dd1[99]=9;
    10                                  ;   for(i=1; i<99; i++) dd1[i]=7;
    11                                  ;   printf("dd1[0]=%d, dd1[1]=%d, dd1[98]=%d, dd1[99]=%d\n",
    12                                  ;           dd1[0], dd1[1], dd1[98],dd1[99]);
    13                                  ;   return 0;
    14                                  ;}
    15                                  ; execution output is dd1[0]=5, dd1[1]=7, dd1[98]=7, dd1[99]=9
    16                                   
    17                                  	section	.bss
    18 00000000 <res 00000190>          dd1:	resd	100
    19 00000190 <res 00000004>          i:	resd	1		; actually unused, kept in register
    20                                  
    21                                  	section .text
    22                                  	global main
    23 00000000 C705[00000000]0500-     main:	mov dword [dd1],5	; dd1[0]=5;
    24 00000008 0000               
    25 0000000A C705[8C010000]0900-     	mov dword [dd1+99*4],9	; dd1[99]=9;
    26 00000012 0000               
    27                                  
    28 00000014 BF04000000              	mov edi,4		; i=1; /* 4 bytes */
    29 00000019 C787[00000000]0700-     loop1:	mov dword [dd1+edi],7	; dd1[i]=7;
    30 00000021 0000               
    31 00000023 83C704                  	add edi,4		; i++; /* 4 bytes */
    32 00000026 81FF8C010000            	cmp edi,4*99		; i<99
    33 0000002C 75EB                    	jne	loop1		; loop until i=99
    34                                  	
    35                                          extern	printf		; the C function, to be called
    36                                          section .data		; Data section, initialized variables
    37 00000000 6464315B305D3D2564-     fmt:    db "dd1[0]=%d, dd1[1]=%d, dd1[98]=%d, dd1[99]=%d",10,0
    38 00000009 2C206464315B315D3D-
    39 00000012 25642C206464315B39-
    40 0000001B 385D3D25642C206464-
    41 00000024 315B39395D3D25640A-
    42 0000002D 00                 
    43                                  
    44                                  	section .text           ; Code section, continued
    45 0000002E FF35[8C010000]          	push	dword [dd1+99*4]	; dd1[99]
    46 00000034 FF35[88010000]                  push    dword [dd1+98*4]	; dd1[98]
    47 0000003A FF35[04000000]          	push	dword [dd1+4]	; dd1[1]
    48 00000040 FF35[00000000]                  push    dword [dd1]	; dd1[0]
    49 00000046 68[00000000]                    push    dword fmt	; address of format string
    50 0000004B E8(00000000)                    call    printf		; Call C function
    51 00000050 83C414                          add     esp, 20		; pop stack 5 push times 4 bytes
    52                                  
    53 00000053 B800000000              	mov	eax,0		; normal, no error, return value
    54 00000058 C3                      	ret			; return 0;
    55                                  				; no registers needed to be saved