[PATCH v5 00/12] Add CET shadow stack support

[Christina Schimpe <christina.schimpe@intel.com>]

Hi all,

this is my v5 of the series to add amd64 shadow stack support to GDB on linux.
It addresses the feedback of Luis.

v4 can be found here:
https://sourceware.org/pipermail/gdb-patches/2025-June/218744.html

Changes since v4:
- Improve some comments.
- Change the test in "gdb: amd64 linux coredump support with shadow
  stack." to also test core file generated by the linux kernel.  This
  requires changes for the core_find procedure to save program output,
  that have been implemented by Thiago already, so we include this part
  of the patch in this series: "gdb, testsuite: Extend core_find procedure
  to save program output.".  The test is now very similar to the test
  implemented for Guarded Control Stack corefiles.  Thanks to Thiago for
  providing the input here!

I am looking forward to your feedback!

Regards,

Christina

Christina Schimpe (12):
  gdb, testsuite: Extend core_find procedure to save program output.
  gdbserver: Add optional runtime register set type.
  gdbserver: Add assert in x86_linux_read_description.
  gdb: Sync up x86-gcc-cpuid.h with cpuid.h from gcc 14 branch.
  gdb, gdbserver: Use xstate_bv for target description creation on x86.
  gdb, gdbserver: Add support of Intel shadow stack pointer register.
  gdb: amd64 linux coredump support with shadow stack.
  gdb: Handle shadow stack pointer register unwinding for amd64 linux.
  gdb, gdbarch: Enable inferior calls for shadow stack support.
  gdb: Implement amd64 linux shadow stack support for inferior calls.
  gdb, gdbarch: Introduce gdbarch method to get the shadow stack
    pointer.
  gdb: Enable displaced stepping with shadow stack on amd64 linux.

 gdb/NEWS                                      |   6 +
 gdb/amd64-linux-nat.c                         |  17 ++
 gdb/amd64-linux-tdep.c                        | 218 +++++++++++++++++-
 gdb/amd64-tdep.c                              |  35 ++-
 gdb/amd64-tdep.h                              |   9 +-
 gdb/arch-utils.c                              |  10 +
 gdb/arch-utils.h                              |   5 +
 gdb/arch/amd64-linux-tdesc.c                  |  33 +--
 gdb/arch/amd64-linux-tdesc.h                  |   7 +-
 gdb/arch/amd64.c                              |  25 +-
 gdb/arch/amd64.h                              |  10 +-
 gdb/arch/i386-linux-tdesc.c                   |  29 +--
 gdb/arch/i386-linux-tdesc.h                   |   5 +-
 gdb/arch/i386.c                               |  19 +-
 gdb/arch/i386.h                               |   8 +-
 gdb/arch/x86-linux-tdesc-features.c           |  60 ++---
 gdb/arch/x86-linux-tdesc-features.h           |  25 +-
 gdb/doc/gdb.texinfo                           |  42 ++++
 gdb/features/Makefile                         |   2 +
 gdb/features/i386/32bit-ssp.c                 |  14 ++
 gdb/features/i386/32bit-ssp.xml               |  11 +
 gdb/features/i386/64bit-ssp.c                 |  14 ++
 gdb/features/i386/64bit-ssp.xml               |  11 +
 gdb/gdbarch-gen.c                             |  54 +++++
 gdb/gdbarch-gen.h                             |  24 ++
 gdb/gdbarch_components.py                     |  31 +++
 gdb/i386-tdep.c                               |  51 +++-
 gdb/i386-tdep.h                               |  11 +-
 gdb/infcall.c                                 |  14 +-
 gdb/linux-tdep.c                              |  47 ++++
 gdb/linux-tdep.h                              |   7 +
 gdb/nat/x86-gcc-cpuid.h                       | 153 +++++++++---
 gdb/nat/x86-linux-tdesc.c                     |  20 +-
 gdb/nat/x86-linux-tdesc.h                     |   7 +-
 gdb/nat/x86-linux.c                           |  57 +++++
 gdb/nat/x86-linux.h                           |   4 +
 .../gdb.arch/amd64-shadow-stack-cmds.exp      | 141 +++++++++++
 .../gdb.arch/amd64-shadow-stack-corefile.c    |  42 ++++
 .../gdb.arch/amd64-shadow-stack-corefile.exp  | 110 +++++++++
 .../gdb.arch/amd64-shadow-stack-disp-step.exp |  92 ++++++++
 gdb/testsuite/gdb.arch/amd64-shadow-stack.c   |  35 +++
 gdb/testsuite/gdb.arch/amd64-ssp.exp          |  50 ++++
 .../gdb.base/inline-frame-cycle-unwind.py     |   4 +
 gdb/testsuite/lib/gdb.exp                     |  80 ++++++-
 gdb/x86-linux-nat.c                           |  50 +++-
 gdb/x86-linux-nat.h                           |  11 +
 gdb/x86-tdep.c                                |  21 ++
 gdb/x86-tdep.h                                |   9 +
 gdbserver/i387-fp.cc                          |  40 ++--
 gdbserver/linux-amd64-ipa.cc                  |  10 +-
 gdbserver/linux-i386-ipa.cc                   |   6 +-
 gdbserver/linux-low.cc                        |  50 ++--
 gdbserver/linux-low.h                         |   7 +-
 gdbserver/linux-x86-low.cc                    |  44 +++-
 gdbsupport/x86-xstate.h                       |   7 +-
 55 files changed, 1687 insertions(+), 217 deletions(-)
 create mode 100644 gdb/features/i386/32bit-ssp.c
 create mode 100644 gdb/features/i386/32bit-ssp.xml
 create mode 100644 gdb/features/i386/64bit-ssp.c
 create mode 100644 gdb/features/i386/64bit-ssp.xml
 create mode 100644 gdb/testsuite/gdb.arch/amd64-shadow-stack-cmds.exp
 create mode 100644 gdb/testsuite/gdb.arch/amd64-shadow-stack-corefile.c
 create mode 100644 gdb/testsuite/gdb.arch/amd64-shadow-stack-corefile.exp
 create mode 100644 gdb/testsuite/gdb.arch/amd64-shadow-stack-disp-step.exp
 create mode 100644 gdb/testsuite/gdb.arch/amd64-shadow-stack.c
 create mode 100644 gdb/testsuite/gdb.arch/amd64-ssp.exp

-- 
2.43.0