x86: x86-64 ptrace get/putreg current task
This generalizes the getreg and putreg functions so they can be used on the current task, as well as on a task stopped in TASK_TRACED and switched off. This lays the groundwork to share this code for all kinds of user-mode machine state access, not just ptrace. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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