[PATCH] D49791: [AArch64] - Generate pointer authentication instructions

[Luke Cheeseman via Phabricator via llvm-commits]

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

Generate pointer authentication instructions

- The functions instrumented depend on function attribtues: all (all functions instrumentent), non-leaf (only those that spill LR), none
- Function epilogues sign the LR before spilling to the stack and authenticate the LR once restored
- If the target is v8.3a or greater than can use the combined authenticate and return instruction


Repository:
  rL LLVM

https://reviews.llvm.org/D49791

Files:
  lib/Target/AArch64/AArch64FrameLowering.cpp
  test/CodeGen/AArch64/sign-return-address.ll

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