Messages in this thread | | | Date | Mon, 20 Aug 2012 10:27:44 +0100 | From | Will Deacon <> | Subject | Re: [PATCH v2 23/31] arm64: Debugging support |
| |
On Mon, Aug 20, 2012 at 10:07:54AM +0100, Will Deacon wrote: > On Fri, Aug 17, 2012 at 08:06:07AM +0100, Arnd Bergmann wrote: > > Sorry for the dumb question, but why do you even need PTRACE_GET_THREAD_AREA > > for 64 bit tasks? I thought the thread pointer is a GPR, or is this just > > for compat tasks? > > The TLS is stored in a co-processor register which is read-only for > userspace.
I should elaborate: the register is RW for AArch64 tasks, RO for aarch32 tasks (although that doesn't affect the need for the ptrace request).
Will
| |