[RFA][PATCH v4 0/5] Add TDB regset support

[Andreas Arnez <arnez@linux.vnet.ibm.com>]

This is another iteration of GDB support for the "transaction diagnostic
block", TDB, which is provided by the transactional-execution facility
in newer z/Architecture systems.

There was some discussion on previous versions of this patch,
specifically about the part that introduces dynamic core file register
notes support.  Thus this version continues supporting the old "static"
interface.  Also, the architecture-specific patches are now separated
out for easier review.

 NEWS                       |    4 
 corelow.c                  |   42 +--
 doc/gdb.texinfo            |   38 ++
 features/Makefile          |    3 
 gdbarch.c                  |   35 ++
 gdbarch.h                  |   19 +
 gdbarch.sh                 |   36 +-
 gdbserver/Makefile.in      |    7 
 gdbserver/configure.srv    |    5 
 gdbserver/linux-s390-low.c |   25 +
 linux-tdep.c               |  103 ++++---
 ppc-linux-tdep.c           |   93 +------
 regset.c                   |   22 +
 regset.h                   |    7 
 s390-nat.c                 |  256 +++++++++----------
 s390-tdep.c                |  590 +++++++++++++++++++++------------------------
 s390-tdep.h                |   60 ++++
 17 files changed, 739 insertions(+), 606 deletions(-)