[PATCH 00/11] Aarch64 linux GDB native multi-arch debugging (part 1)

[Yao Qi <qiyaoltc@gmail.com>]

This patch series is to enable Aarch64 GDB (64-bit) debug arm program
(32-bit) rudimentarily, which means with these patches applied, Aarch64
GDB is able to do some basic debugging to arm program .  However, some
features are still missing,

 - Debug multi-threaded program,
 - Use HW watchpoint and breakpoint,

because current linux kernel ptrace doesn't have right requests to get
the TLS area and to set HW watchpoint registers.  I am still working
with kernel hackers to get ptrace requests ready.  Our plan is to be
clear on aarch64 multi-arch debugging requirements to kernel first,
get them upstream to kernel, and then, post the rest of aarch64 gdb
multi-arch patches.  Afterwards, I'll add aarch64 multi-arch support
in gdbserver too.

Patch #1 is to align arm-linux-nat.c to aarch64-linux-nat.c, it is a
refactor patch.  Patch #2 and #3 starts the basic multi-arch debugging
support, in which some code is shared between arm and aarch64.  Patch
#4 is to adjust all arm-*.xml target descriptions to fix some fails
I've seen.  Patch #5 - #8 are various tweaks to gdb testsuite for
aarch64 multi-arch debugging.

Patch #9 - #11 can be regarded as an RFC, which teaches GDB to use
hardware single step in software single step architecture if target
supports hardware single step.  They are useful to aarch64 multi-arch
debugging, because hardware single step is available for arm32 process
on aarch64.

The whole series is tested on aarch64-linux with both aarch64 gcc and
arm gcc.  It is also tested on arm-linux and x86_64-linux.  Since we'll
branch 7.10 soon, I don't like to have such big change at last moment
of branching and releasing.  I plan to push them (or part of them) in
after 7.10 branch is created, if there are no objections.

*** BLURB HERE ***

Yao Qi (11):
  Remove {fetch,store}_fpregister and {fetch,store}_register
  New aarch32-linux-nat.c
  Native debug arm program by aarch64 GDB
  Set architecture to arm in arm-*.xml files
  Adjust gdb.multi tests for aarch64
  Enable multi-arch test in catch-syscall.exp on aarch64
  New proc is_aarch32_target
  New proc is_aarch64_target
  [gdbserver] Rename supports_conditional_breakpoints to
    supports_hardware_single_step
  Reply s and S vCont actions if target supports hardware single step
  New target_ops hook to_can_do_single_step

 gdb/aarch32-linux-nat.c                        |  99 +++++++++
 gdb/aarch32-linux-nat.h                        |  34 +++
 gdb/aarch64-linux-nat.c                        | 209 +++++++++++++++----
 gdb/arm-linux-nat.c                            | 274 ++-----------------------
 gdb/arm-linux-tdep.c                           |   5 +
 gdb/config/aarch64/linux.mh                    |   2 +-
 gdb/config/arm/linux.mh                        |   2 +-
 gdb/configure.tgt                              |   1 +
 gdb/features/arm-with-m-fpa-layout.c           |   2 +
 gdb/features/arm-with-m-fpa-layout.xml         |   1 +
 gdb/features/arm-with-m-vfp-d16.c              |   2 +
 gdb/features/arm-with-m-vfp-d16.xml            |   1 +
 gdb/features/arm-with-m.c                      |   2 +
 gdb/features/arm-with-m.xml                    |   1 +
 gdb/features/arm-with-neon.c                   |   2 +
 gdb/features/arm-with-neon.xml                 |   1 +
 gdb/features/arm-with-vfpv2.c                  |   2 +
 gdb/features/arm-with-vfpv2.xml                |   1 +
 gdb/features/arm-with-vfpv3.c                  |   2 +
 gdb/features/arm-with-vfpv3.xml                |   1 +
 gdb/gdbserver/linux-low.c                      |  11 +-
 gdb/gdbserver/lynx-low.c                       |   5 +-
 gdb/gdbserver/nto-low.c                        |   5 +-
 gdb/gdbserver/server.c                         |  19 +-
 gdb/gdbserver/spu-low.c                        |   2 +-
 gdb/gdbserver/target.c                         |   8 +
 gdb/gdbserver/target.h                         |  13 +-
 gdb/gdbserver/win32-low.c                      |   5 +-
 gdb/remote.c                                   |  33 ++-
 gdb/target-delegates.c                         |  31 +++
 gdb/target.h                                   |   9 +
 gdb/testsuite/gdb.arch/aarch64-atomic-inst.exp |   2 +-
 gdb/testsuite/gdb.arch/aarch64-fp.exp          |   2 +-
 gdb/testsuite/gdb.arch/arm-bl-branch-dest.exp  |   2 +-
 gdb/testsuite/gdb.arch/arm-disp-step.exp       |   2 +-
 gdb/testsuite/gdb.arch/thumb-bx-pc.exp         |   2 +-
 gdb/testsuite/gdb.arch/thumb-prologue.exp      |   2 +-
 gdb/testsuite/gdb.arch/thumb-singlestep.exp    |   2 +-
 gdb/testsuite/gdb.base/catch-syscall.exp       |   7 +-
 gdb/testsuite/gdb.base/disp-step-syscall.exp   |   2 +-
 gdb/testsuite/gdb.base/float.exp               |   4 +-
 gdb/testsuite/gdb.multi/multi-arch-exec.exp    |  18 +-
 gdb/testsuite/gdb.multi/multi-arch.exp         |  18 +-
 gdb/testsuite/gdb.reverse/aarch64.exp          |   2 +-
 gdb/testsuite/lib/gdb.exp                      |  47 +++++
 45 files changed, 546 insertions(+), 351 deletions(-)
 create mode 100644 gdb/aarch32-linux-nat.c
 create mode 100644 gdb/aarch32-linux-nat.h

-- 
1.9.1