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    SubjectRe: [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


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