Segmentation error assembly

rockxasm · Apr 11, 2020

Hi I am on linux 64bit and when I run the asm code it tells me segmentation error
here is the code:
GNU nano 4.8 main.asm
SECTION .data ; Section containing initialised data

SECTION .text ; Section containing code

global _start ; Linker needs this to find the entry point!

_start: ; Write your instructions between the two noops
mov ax, 5307h
mov cx, 3
mov bx, 1
int 15h

and I use nasm and ld for compiling and linking on 64 bit :
nasm -felf64 main.asm
ld main.o
do anyone have any solution for the problem ?

Salem · Apr 13, 2020

Because Linux != DOS.

> mov ax, 5307h

http://www.ctyme.com/intr/rb-1404.htm

No, you can't just power off the machine with a few simple asm instructions poking away at a non-existent DOS interrupt from the user space of a 64-bit protected operating system.

> do anyone have any solution for the problem ?
Which problem is that?

If you want to know how to interact with the Linux kernel at the ASM level, then you need to read up on that subject.

https://linux-kernel-labs.github.io/refs/heads/master/lectures/syscalls.html

If you want to mess around with old time 16-bit code, then this might help.

https://www.dosbox.com/

You would install some 16 bit assembler inside DOSBox.
You then write your 16 bit ASM code and watch DOSbox shutdown.

--
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.

rockxasm · Apr 13, 2020

I understand , thank you for your response but I have another question:
I have searched about the code to shutdown my computer in assembly linux x86/x64 and it's worked on my pc
now i want to send a hex file built around the code to a machine in my local network to reboot is that possible?

Salem · Apr 13, 2020

> hex file built around the code
What does this even mean?

Normally, if you want to remote admin a machine on your local network, you 'ssh' into it and issue the shutdown command to shutdown or reboot.

--
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.

rockxasm · Apr 13, 2020

it is understood thank you very much for your response

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Segmentation error assembly

rockxasm

Programmer

Salem

Programmer

rockxasm

Programmer

Salem

Programmer

rockxasm

Programmer

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