Because I used the Fedora distro I add my tutorial here.
If you want to learn assembly programming for Windows O.S. or Linux with the Intel C.P.U. then you need the FASM tool and this manual.
Today I will show you how to create a file using my Fedora 31 Linux distro and FASM tool.
The name of this file will be new_file.txt.
The assembly program will use INT 0x08 to create the file.
entry _start
filename db "new_file.txt", 0
_start:
; create a new file
mov rax, 8
mov rbx, filename
mov rcx, 0011
int 0x80
; use descriptor
push rax
; close the new file
mov rax, 6
pop rbx
int 0x80
call exit
exit:
mov rax, 1
mov rbx, 0
int 0x80
>
The program also set the file permissions in the rcx register.Let's see some octal permissions:
mov rcx, 000
----------. 1 mythcat mythcat 0 Nov 10 17:40 new_file.txt
mov rcx, 0001
---------x. 1 mythcat mythcat 0 Nov 10 17:41 new_file.txt
mov rcx, 0011
------x--x. 1 mythcat mythcat 0 Nov 10 17:43 new_file.txt