[PATCH] D74537: [LLD][ELF][AArch64] Fix plt generation for PAC/BTI.

[Daniel Kiss via Phabricator via llvm-commits]

danielkiss created this revision.
danielkiss added a reviewer: peter.smith.
Herald added subscribers: llvm-commits, MaskRay, kristof.beyls, arichardson, emaste.
Herald added a reviewer: espindola.
Herald added a project: LLVM.

Generate PAC protected plt only when "-z pac-plt" is passed to the
linker. GNU toolchain generates when it is explicitly requested[1].
When pac-plt is requested then set the GNU_PROPERTY_AARCH64_FEATURE_1_PAC
note even when not all function compiled with PAC but issue a warning.
Harmonizing the warning style for BTI/PAC/IBT.
Generate BTI protected PLT if case of "-z force-bti".

[1] https://www.sourceware.org/ml/binutils/2019-03/msg00021.html


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D74537

Files:
  lld/ELF/Arch/AArch64.cpp
  lld/ELF/Driver.cpp
  lld/ELF/SyntheticSections.cpp
  lld/test/ELF/aarch64-feature-bti.s
  lld/test/ELF/aarch64-feature-btipac.s
  lld/test/ELF/aarch64-feature-pac.s

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