[PATCH] D92469: [ARM] harden-sls-blr: avoid r12 and lr in indirect calls

[Kristof Beyls via Phabricator via llvm-commits]

kristof.beyls created this revision.
kristof.beyls added a reviewer: ostannard.
Herald added subscribers: llvm-commits, danielkiss, hiraditya.
Herald added a project: LLVM.
kristof.beyls requested review of this revision.

As a linker is allowed to clobber r12 on function calls, the
code transformation that hardens indirect calls is not correct in case a
linker does so.  Similarly, the transformation is not correct when
register lr is used.

This patch makes sure that r12 or lr are not used for indirect calls
when harden-sls-blr is enabled.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D92469

Files:
  llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp
  llvm/lib/Target/ARM/ARMBaseInstrInfo.h
  llvm/lib/Target/ARM/ARMCallLowering.cpp
  llvm/lib/Target/ARM/ARMExpandPseudoInsts.cpp
  llvm/lib/Target/ARM/ARMFastISel.cpp
  llvm/lib/Target/ARM/ARMFeatures.h
  llvm/lib/Target/ARM/ARMISelLowering.cpp
  llvm/lib/Target/ARM/ARMInstrInfo.td
  llvm/lib/Target/ARM/ARMInstrThumb.td
  llvm/lib/Target/ARM/ARMPredicates.td
  llvm/lib/Target/ARM/ARMRegisterBankInfo.cpp
  llvm/lib/Target/ARM/ARMRegisterInfo.td
  llvm/lib/Target/ARM/ARMSLSHardening.cpp
  llvm/test/CodeGen/ARM/speculation-hardening-sls.ll

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