How to write a byte array correctly in Assembly?

I need to write a byte array, but I don't get it, only written [matrix + 0]

and [matrix + 1]

(what I mean, EAX should be equal 0301070F

), what am I doing wrong?

This is my code:

%include "asm_io.inc"
segment .data
    matrix times 4 db 0

segment .bss

segment .text

  global asm_main

asm_main:
    enter 0,0
    pusha
    mov eax, 0

    mov dword [matrix + 3], 15
    mov dword [matrix], 3
    mov dword [matrix + 1], 1
    mov dword [matrix + 2], 7

    mov ah, [matrix]
    mov al, [matrix + 1]
    rol eax, 16
    mov ah, [matrix + 2]
    mov al, [matrix + 3]

    dump_regs 1

  popa
  mov eax, 0
  leave
  ret

      

        
        
        
      

    

and this is the result dump_regs 1

:

Register Dump # 1
EAX = 03010000 EBX = B774FFF4 ECX = BFF7C924 EDX = BFF7C8B4
ESI = 00000000 EDI = 00000000 EBP = BFF7C868 ESP = BFF7C848
EIP = 080484D8 FLAGS = 0282       SF   

      

        
        
        
      

    

The caller is a simple program C

:

int main() {
  int ret_status;
  ret_status = asm_main();
  return ret_status;
}

      

        
        
        
      

    

Edited: I found something wrong here, if I execute this code everything works:

    mov dword [matrix], 3
    mov dword [matrix + 1], 1
    mov dword [matrix + 2], 7
    mov dword [matrix + 3], 15

      

        
        
        
      

    

but if i execute this doesn't work:

    mov dword [matrix + 3], 15
    mov dword [matrix], 3
    mov dword [matrix + 1], 1
    mov dword [matrix + 2], 7

      

        
        
        
      

    

Why?