[PATCH v2 0/8] Support for AArch64 Pointer Authentication

[Alan Hayward <Alan.Hayward@arm.com>]

Pointer Authentication is a new feature in AArch64 v8.3-a. When enabled in
the compiler, function return addresses will be mangled by the kernel. This
set of patches adds support to add the new registers and umangle addresses
to allow the unwinder to work.

Linux Kernel support is in Linux 5.0, and was added here:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=04ca3204fa09f5f55c8f113b0072004a7b364ff4

Binutils support was added earlier this year:
https://www.sourceware.org/ml/binutils/2019-02/msg00069.html

GCC support is in GCC 7.1.1 and is enabled by default when building for
8.3-a, originally added here:
https://gcc.gnu.org/ml/gcc-patches/2017-01/msg00376.html
Additional support is in progress, see:
https://gcc.gnu.org/ml/gcc-patches/2018-11/msg00697.html


This patch series has been tested on an 8.3 Fast Model running head Linux,
using both head GCC and GCC patched with the additional support.

This series is a reworking of the series originally posted by Jiong:
https://sourceware.org/ml/gdb-patches/2017-08/msg00170.html

Patches 1-5 add the new feature, register support and feature detection.
Patches 6 and 7 add the address unmangling.
Patch 8 adds core file support.


Alan Hayward (8):
  AArch64: Add pointer authentication feature
  AArch64: Use HWCAP to detect pauth feature
  AArch64: Read pauth registers
  AArch64: gdbserver: read pauth registers
  AArch64: Add pauth DWARF registers
  AArch64: DWARF unwinder support for signed return addresses
  AArch64: Prologue scan unwinder support for signed return addresses
  AArch64: Read pauth section from core files

 gdb/aarch64-linux-nat.c                      |  41 ++-
 gdb/aarch64-linux-tdep.c                     |  36 +-
 gdb/aarch64-linux-tdep.h                     |   9 +
 gdb/aarch64-tdep.c                           | 325 ++++++++++++++++---
 gdb/aarch64-tdep.h                           |  14 +-
 gdb/arch/aarch64.c                           |   6 +-
 gdb/arch/aarch64.h                           |   9 +-
 gdb/doc/gdb.texinfo                          |   3 +
 gdb/features/Makefile                        |   1 +
 gdb/features/aarch64-pauth.c                 |  16 +
 gdb/features/aarch64-pauth.xml               |  13 +
 gdb/gdbserver/linux-aarch64-ipa.c            |   8 +-
 gdb/gdbserver/linux-aarch64-low.c            |  55 +++-
 gdb/gdbserver/linux-aarch64-tdesc-selftest.c |   2 +-
 gdb/gdbserver/linux-aarch64-tdesc.c          |  10 +-
 gdb/gdbserver/linux-aarch64-tdesc.h          |   2 +-
 gdb/gdbserver/linux-low.c                    |  14 +-
 gdb/gdbserver/linux-low.h                    |   1 +
 18 files changed, 491 insertions(+), 74 deletions(-)
 create mode 100644 gdb/features/aarch64-pauth.c
 create mode 100644 gdb/features/aarch64-pauth.xml

-- 
2.17.2 (Apple Git-113)