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  1. ; ------------------------------------------------------------------
  2. ; helloworld.asm
  3. ;
  4. ; This is a Win32 console program that writes "Hello World"
  5. ; on a single line and then exits.
  6. ;
  7. ; To assemble to .obj: nasm -f win32 helloworld.asm
  8. ; To compile to .exe:  gcc helloworld.obj -o helloworld.exe
  9. ; ------------------------------------------------------------------
  10.  
  11. global _main ; _start
  12.  
  13. ; The data section is used for declaring initialized data or constants. 
  14. ; This data does not change at runtime. 
  15. ; You can declare various constant values, file names or buffer size etc. in this section.
  16. section .data
  17. 	msg 		db 0xA, 'Hello World!', 0xA, 0	; Hello World message. 
  18. 												; 0xA (10) is hex for (NL), carriage return
  19. 												; 0 terminates the line
  20. 	msglen 		equ $ - msg						; length of the Hello World message.
  21.  
  22. 	mydate 		dw "06-Jan-2024 07:55 AM", 0xA	; Today's Date.
  23. 	mydatelen	equ $ - mydate					; Length of mydate variable.
  24.  
  25. 	s2 times 9 db '*' 							; print '*' 9 times
  26.  
  27. ; The bss section is used for declaring variables.
  28. section .bss
  29.  
  30.  
  31. ; The text section is used for keeping the actual code. 
  32. ; This section must begin with the declarationglobal main, 
  33. ; which tells the kernel where the program execution begins.
  34. section .text
  35.  
  36. ; _start:
  37. _main:
  38. 	; print '*' 9 times.
  39. 	mov		edx, 9			; message length
  40. 	mov		ecx, s2			; message to write
  41. 	mov 	ebx, 01h		; file descriptor (stdout)
  42. 	mov 	eax, 04h		; system call number (sys_write)
  43. 	int 	0x80			; call kernel
  44.  
  45. 	; Print message "Hello World".
  46. 	mov		edx, msglen		; message length
  47. 	mov		ecx, msg		; message to write
  48. 	mov 	ebx, 01h		; file descriptor (stdout)
  49. 	mov 	eax, 04h		; system call number (sys_write)
  50. 	int 	0x80			; call kernel
  51.  
  52. 	; Print current system date.
  53. 	mov		edx, mydatelen	; message length
  54. 	mov		ecx, mydate		; message to write
  55. 	mov 	ebx, 01h		; file descriptor (stdout)
  56. 	mov 	eax, 04h		; system call number (sys_write)
  57. 	int 	0x80			; call kernel
  58.  
  59. 	; print '*' 9 times.
  60. 	mov		edx, 9			; message length
  61. 	mov		ecx, s2			; message to write
  62. 	mov 	ebx, 01h		; file descriptor (stdout)
  63. 	mov 	eax, 04h		; system call number (sys_write)
  64. 	int 	0x80			; call kernel
  65.  
  66. 	jmp		exit
  67.  
  68. exit:
  69. 	mov		eax, 01h		; exit()
  70. 	xor		ebx, ebx		; errno
  71. 	int		80h
  72.  
Success #stdin #stdout 0s 5288KB
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stdin
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Standard input is empty
stdout
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*********
Hello World!
06-Jan-2024 07:55 AM
*********
https://ideone.com/TKHExv
language:
Assembler 32bit (nasm 2.14)
created:
11 days ago
visibility:
public

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