[RFC PATCH v2 0/5] Handle variable XSAVE layouts

[John Baldwin <jhb@FreeBSD.org>]

Changes since V1:

- Renamed xsave_offsets to x86_xsave_layout and added a total size
  member.

- Fetch the x86_xsave_layout in i386_gdbarch_init and save it in a new
  member of i386_gdbarch_tdep.

- Patch 1 now only deals with defining the new structure and adding it
  to the tdep.

- The i387_set_xsave_layout helper function is moved to patch 2 and
  the description has been updated to be more explicit about it being
  a fallback to be supplanted in the future by a new core dump note.

- The changes to i387-tdep.c to change the XSAVE parsing has now been
  moved to the end in patch 5.  It also now uses the new member from
  tdep instead of reading from the target every time.

- Patch 3 (FreeBSD core dump support changes) uses the XSAVE size
  saved in the tdep member as the register set size and no longer uses
  REGSET_VARIABLE_SIZE.  This should properly honor the native CPU's
  layout when writing a core dump via gcore.

John Baldwin (5):
  x86: Add an x86_xsave_layout structure to handle variable XSAVE
    layouts.
  core: Support fetching TARGET_OBJECT_X86_XSAVE_LAYOUT from
    architectures.
  Update x86 FreeBSD architectures to support XSAVE layouts.
  Support XSAVE layouts for the current host in the FreeBSD/amd64
    target.
  x86: Use x86_xstate_layout to parse the XSAVE extended state area.

 gdb/amd64-fbsd-nat.c      |  90 ++++++-
 gdb/amd64-fbsd-tdep.c     |   8 +-
 gdb/corelow.c             |  22 ++
 gdb/gdbarch-components.py |  13 +
 gdb/gdbarch-gen.h         |  10 +
 gdb/gdbarch.c             |  32 +++
 gdb/i386-fbsd-tdep.c      |  37 ++-
 gdb/i386-fbsd-tdep.h      |   6 +
 gdb/i386-tdep.c           |  36 ++-
 gdb/i386-tdep.h           |  30 +++
 gdb/i387-tdep.c           | 491 ++++++++++++++++++++++++--------------
 gdb/i387-tdep.h           |   8 +
 gdb/target.h              |   2 +
 13 files changed, 594 insertions(+), 191 deletions(-)

-- 
2.34.1