2012/7/23 Ram Tummala <venkatram867@xxxxxxxxx>
On Jul 23, 2012, at 9:32 AM, Fan Yang <lljyangfan@xxxxxxxxx> wrote:
> hi all:
> when I change the cr0 register I get a "Segmentation fault (core dumped)".
> my code is :
>
>
> .data
> .text
> .global _start
> _start:
> movl %eax, %cr0
>
> this code can work well in ubuntu system when I use root to run it. So what can I do to work it in redhat system?
Changing a control register is a privileged operation. You can't do it
from the user space. You can only do it from ring 0.
Venkatram Tummala
>
> thanks
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies@xxxxxxxxxxxxxxxxx
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
May be I can work it by adding a new syscall in the kernel, right?
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
