CODEWITHSUNDEEP
assemblysystem-callsgnu-assembler
user_4685247
user_4685247

Reputation: 2995

System calls in GAS

I'm trying to create a folder in 64 bit GNU as like this:

.global main

.text
main:
    movl $83, %edi      # SYS_mkdir
    movl $folder, %esi  # folder_name
    movl $0777, %edx    # flags
    call syscall

    ret                 # exit
folder: .string "folder"

this code works, however I'd rather implement it using the "int 0x80" call, but I can't seem to get it to work, I've tried it like this:

mov $83, %eax
mov $folder, %ebx
mov $0777, %ecx
syscall

however it does not work, even if I use the 64 bit registers.

Also how could I translate this code to 32 bit? (preferably using int 0x80)

Upvotes: 1

Views: 1106

Answers (1)

Dejan Skledar
Dejan Skledar

Reputation: 11435

In 64 bit syntax you have to use syscall like this:

mov $folder, %rdi
mov $0777, %rsi
mov $83, %rax
syscall

In 32 bit all you have to do is replace registers with 32 bit ones and use int 0x80 instead of syscall

Upvotes: 1

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