mov ebx, eax     ; the file descriptor that is returned by the open syscall (argument 1)
mov eax, 0x3     ; read syscall
mov edi, esp     ; preserve the stack pointer in EDI
mov ecx, edi     ; ECX points to the stack (argument 2)
mov edx, 0x1000  ; set 4096 bytes to read
int 0x80