Assembly mkdir in linux os

Question

I should create in assembly code (at & t Style) a function that creates a directory (Linux OS).debugging with gdb when I run my code returns a permission error. I think I'm wrong in passing parameters. thank you very much.

 .data
 Messaggio:   .string   "Salve\n"
 cartella:    .string   "prova" 
 length = .-Messaggio
s_irusr  =    00400
s_iwusr  =    00200
s_ixusr  =    00100
.text

.global _lpshow
.global _cd

_lpshow:

    mov $4,%eax        
    mov $1,%ebx       #stdout
    mov $Messaggio,%ecx    #message address
    mov $length,%edx        # message string length
    int $0x80

    #sys_exit(return_code)

    mov $1,%eax        # sys_exit syscall
    mov $0,%ebx        #return 0 (success)
    int $0x80
ret 

_cd :
    mov $39,%eax
    mov $cartella,%ebx
    mov s_iwusr|s_irusr|s_ixusr,%ecx
    int $0x80
ret

Answer 1

The line mov s_iwusr|s_irusr|s_ixusr,%ecx is missing a $ sign to denote an immediate, like mov $s_iwusr|s_irusr|s_ixusr,%ecx.

Of course the code as-is will exit before it even tries to create the directory, but I assume you have something that tries to call _cd (which is a misleading name, by the way).