[PATCH 32 0/2] Handle the new .note section introduced in Linux

[Vignesh Balasubramanian <vigbalas@amd.com>]

The XSAVE layout of the machine where the core file is dumped is not visible
to GDB. It is assumed currently using some heuristics.

It has been addressed to some extent recently but still uses heuristics.
https://inbox.sourceware.org/gdb-patches/2628f45a-77f7-8b2c-20aa-da65d1d82a37@simark.ca/T/#m4c67d59c18a5962f771ba8ca1e2bee9365ad1ab2

New patches have been committed to the linux kernel (version 6.12) to resolve
this issue by adding a new .note section which contains descriptions of the
xsave layout to the core file.

The first of this patch set consumes this new .note section and uses that to
identify the xsave layout.
The second one enables gdb to generate a similar .note section if the corefile
is dumped through the 'gcore' command.

Working on test case patch, will share it in a few days.

This patch shoud be applied on top of binutils patch: https://sourceware.org/pipermail/binutils/2025-September/144207.html

Co-Authored-By: Jini Susan George <jinisusan.george@amd.com>

Vignesh Balasubramanian (2):
  core: Consume the new .note section that contains descriptions of
    xsave layout
  gcore: Create a new .note section for x86

 gdb/amd64-linux-tdep.c     |  2 +-
 gdb/gcore-elf.c            | 18 ++++++++
 gdb/gcore-elf.h            |  8 ++++
 gdb/i386-linux-tdep.c      | 25 ++++++++---
 gdb/i386-linux-tdep.h      |  3 +-
 gdb/i387-tdep.c            | 86 ++++++++++++++++++++++++++++++++++++++
 gdb/i387-tdep.h            | 12 ++++++
 gdb/linux-tdep.c           |  1 +
 gdb/nat/x86-xstate.c       | 31 ++++++++++++++
 gdb/nat/x86-xstate.h       |  6 +++
 gdb/target-debug.h         |  6 +++
 gdb/target-delegates-gen.c | 26 ++++++++++++
 gdb/target.c               |  5 +++
 gdb/target.h               | 10 +++++
 gdb/x86-linux-nat.c        |  6 +++
 gdb/x86-linux-nat.h        |  1 +
 gdbsupport/x86-xstate.h    |  6 +++
 17 files changed, 244 insertions(+), 8 deletions(-)

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2.34.1