Hardware single-step is only available on v4 and later
architectures.
Signed-off-by: NRichard Kuo <rkuo@codeaurora.org>

Add support for a couple new v4+ registers, along with
newer save/restore pt_regs.
Signed-off-by: NRichard Kuo <rkuo@codeaurora.org>

Code Aurora Forum (CAF) is becoming a part of Linux Foundation Labs.
Signed-off-by: NRichard Kuo <rkuo@codeaurora.org>

Signed-off-by: NDavid Howells <dhowells@redhat.com>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Acked-by: NThomas Gleixner <tglx@linutronix.de>
Acked-by: NMichael Kerrisk <mtk.manpages@gmail.com>
Acked-by: NPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: NDave Jones <davej@redhat.com>
Signed-off-by: NRichard Kuo <rkuo@codeaurora.org>

Signed-off-by: NRichard Kuo <rkuo@codeaurora.org>
Signed-off-by: NLinas Vepstas <linas@codeaurora.org>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>