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

This fixes the return value of sigreturn and moves the work pending check
into a c routine for readability and fixes the loop for multiple pending
signals.  Based on feedback from Al Viro.
Signed-off-by: Richard Kuo <rkuo@codeaurora.org>

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

introduce sane current_pt_regs(), use it in syscalls where needed.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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

Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>