Re: How can I change cr0 register in redhat system

On Jul 23, 2012, at 9:32 AM, Fan Yang <lljyangfan@gmail.com> 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

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