On Wed, Jun 06, 2012 at 11:08:04AM -0700, Jim Keniston wrote: > On Wed, 2012-06-06 at 15:05 +0530, Ananth N Mavinakayanahalli wrote: > > On Wed, Jun 06, 2012 at 11:27:02AM +0200, Peter Zijlstra wrote: > > > On Wed, 2012-06-06 at 14:51 +0530, Ananth N Mavinakayanahalli wrote:
... > > For the kernel, the only ones that are off limits are rfi (return from > > interrupt), mtmsr (move to msr). All other instructions can be probed. > > > > Both those instructions are supervisor level, so we won't see them in > > userspace at all; so we should be able to probe all user level > > instructions. > > Presumably rfi or mtmsr could show up in the instruction stream via an > erroneous or mischievous asm statement. It'd be good to verify that you > handle that gracefully. That'd be flagged elsewhere, by the architecture itself -- you'd get a privileged instruciton exception if you try execute any instruction not part of the UISA. I therefore don't think its a necessary check in the uprobes code. Ananth _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
