[PATCH v2 0/5] Enable PAC support in elfutils

[Steve Capper]

Hello,
This series enables Pointer Authentication (PAC) support in elfutils.

The first three patches were originally posted by German Gomez. I've
rewritten a new patch to extend the dwfl_thread_state_registers function
to handle the PAC mask and added an extra patch that was required to
debug core dumps from PAC enabled applications.

These patches were tested on Debian Testing and Fedora 40 running on an
Apple M1 MacBook Pro (the CFLAG -mbranch-protection=standard needs to be
supplied to the build).

Without this series applied, the following tests failed:
 * run-backtrace-native.sh
 * run-backtrace-dwarf.sh
 * run-backtrace-native-core.sh
 * run-deleted.sh

I am happy to chop/change bits as necessary. 

A guide to pointer authentication can be found here:
https://developer.arm.com/-/media/Arm%20Developer%20Community/PDF/Learn%20the%20Architecture/Providing%20protection%20for%20complex%20software.pdf

Changed in V2:
 * moved DW_AARCH64_RA_SIGN_STATE to cfi.h,
 * dwfl_thread_state_aarch64_pauth API dropped,
   (using dwfl_thread_state_registers instead)
 * AArch64 #ifdefs removed, ptrace logic for PAC consolidated into
   aarch64_initreg.c
 
Cheers,
-- 
Steve

German Gomez (3):
  aarch64: Create definitions for AARCH64_RA_SIGN_STATE register
  libdw, aarch64: Implement DW_CFA_AARCH64_negate_ra_state CFI
    instruction
  libdwfl, aarch64: Demangle return addresses using a PAC mask

Steve Capper (2):
  libdwfl, aarch64: extend dwfl_thread_state_registers to handle PAC
  libdwfl, aarch64: Read PAC mask from core

 backends/aarch64_corenote.c | 17 +++++++++++++++--
 backends/aarch64_initreg.c  | 12 ++++++++++++
 backends/aarch64_regs.c     |  5 ++++-
 libdw/cfi.c                 | 14 +++++++++++++-
 libdw/cfi.h                 |  5 +++++
 libdwfl/dwfl_frame.c        |  3 +++
 libdwfl/dwfl_frame_regs.c   |  6 ++++++
 libdwfl/frame_unwind.c      | 14 +++++++++++++-
 libdwfl/libdwflP.h          |  6 ++++++
 libdwfl/linux-core-attach.c | 34 ++++++++++++++++++++++++++++++++++
 libdwfl/linux-pid-attach.c  |  9 +++++++--
 tests/run-addrcfi.sh        |  1 +
 tests/run-allregs.sh        |  1 +
 13 files changed, 120 insertions(+), 7 deletions(-)

-- 
2.43.0