[PATCH] D51432: [AArch64] Unwinding support for return address signing

[Luke Cheeseman via Phabricator via cfe-commits]

LukeCheeseman created this revision.
LukeCheeseman added reviewers: pcc, kcc, eugenis, vlad.tsyrklevich.
Herald added a reviewer: javed.absar.
Herald added subscribers: cfe-commits, chrib, JDevlieghere, kristof.beyls.

- When return address signing is enabled, the LR may be signed on function entry
- When an exception is thrown the return address is inspected used to unwind the call stack
- Before this happens, the return address must be correctly authenticated to avoid causing an abort by dereferencing the signed pointer


Repository:
  rUNW libunwind

https://reviews.llvm.org/D51432

Files:
  include/libunwind.h
  src/DwarfInstructions.hpp
  src/DwarfParser.hpp
  src/Registers.hpp
  src/dwarf2.h

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