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[0/4] aarch64: avoid exposing signed return addresses [PR94891]

Message ID cover.1591374488.git.szabolcs.nagy@arm.com
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Series aarch64: avoid exposing signed return addresses [PR94891] | expand

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Szabolcs Nagy June 5, 2020, 4:51 p.m. UTC 
I'm not familiar with gcc internals enough to fix this the
right way, this is a big hammer fix to avoid exposing mangled
pointer representation to user code when pointer signing is
used on aarch64. I.e. this is not an optimal fix just to show
how i would want the ABI to work.

This touches unwinder ABI, unwinder debugger hook ABI (patch 3/4),
__builtin_return_address (1/4), __builtin_eh_return (2/4) usage and
updates the documentation a bit in this area (4/4).

Tests are still running. (I expect some existing target tests will
need to be updated.) The last patch is same as I sent before
(just with changelog this time).

Szabolcs Nagy (4):
  aarch64: fix return address access with pac [PR94891][PR94791]
  aarch64: fix __builtin_eh_return with pac-ret [PR94891]
  libgcc: fix the handling of return address mangling [PR94891]
  doc: Clarify __builtin_return_address [PR94891]

 gcc/config/aarch64/aarch64-protos.h    |  1 +
 gcc/config/aarch64/aarch64.c           | 24 +++++++++++++++++-
 gcc/config/aarch64/aarch64.h           |  2 +-
 gcc/doc/extend.texi                    | 16 ++++++++++--
 libgcc/config/aarch64/aarch64-unwind.h | 34 ++++----------------------
 libgcc/unwind-dw2.c                    | 34 ++++++--------------------
 6 files changed, 52 insertions(+), 59 deletions(-)