[all-commits] [llvm/llvm-project] ad4045: [AArch64][compiler-rt] Strip PAC from the link reg...

[Dani via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ad40453fc425ee8e1fe43c7bb6e3c1c3afa9cc3b
      https://github.com/llvm/llvm-project/commit/ad40453fc425ee8e1fe43c7bb6e3c1c3afa9cc3b
  Author: Daniel Kiss <daniel.kiss at arm.com>
  Date:   2021-03-15 (Mon, 15 Mar 2021)

  Changed paths:
    M compiler-rt/lib/sanitizer_common/sanitizer_ptrauth.h
    M compiler-rt/lib/sanitizer_common/sanitizer_stacktrace.cpp
    M compiler-rt/lib/tsan/rtl/tsan_external.cpp
    M compiler-rt/lib/tsan/rtl/tsan_interface.cpp
    M compiler-rt/lib/tsan/rtl/tsan_interface_inl.h

  Log Message:
  -----------
  [AArch64][compiler-rt] Strip PAC from the link register.

-mbranch-protection protects the LR on the stack with PAC.
When the frames are walked the LR need to be cleared.
This inline assembly later will be replaced with a new builtin.

Test: build with  -DCMAKE_C_FLAGS="-mbranch-protection=standard".

Reviewed By: kubamracek

Differential Revision: https://reviews.llvm.org/D98008