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 _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
