[PATCH] D59780: Support Intel Control-flow Enforcement Technology

[Rui Ueyama via Phabricator via llvm-commits]

ruiu created this revision.
ruiu added reviewers: xiangzhangllvm, MaskRay, peter.smith, hjl.tools.
Herald added subscribers: jdoerfert, arichardson, emaste.
Herald added a reviewer: espindola.
Herald added a project: LLVM.

This patch is based on https://reviews.llvm.org/D58102. The changes
from the original patche is as follows:

- The code to parse .note.gnu.property is moved from Driver to InputFiles.
- Several heavy loops (that costs O(n*m) where n and m are the number of files and input sections) are removed.
- ".splt" is now In.Plt. Changes to Relocations.cpp are reverted as we no longer need them.
- Symbol::getSPltVA is removed, as we don't need that function.
- New comments are added.
- Code and test files are generally simplified.

Because I don't have a CPU nor an emulator supporting CET, I can't run
the produced code. So I didn't test the generated executables.

There are a few TODOs in this patch:

- Is --force-cet the best option name? H. J. Lu pointed out that gold has `-z ibtplt` and other options, but I couldn't find these options in the binutils' repository. Is the option really implemneted to gold?
- What is the compiler flag to enable CET? I'd like to write it in a comment for reference.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D59780

Files:
  lld/ELF/Arch/X86.cpp
  lld/ELF/Arch/X86_64.cpp
  lld/ELF/Config.h
  lld/ELF/Driver.cpp
  lld/ELF/InputFiles.cpp
  lld/ELF/InputFiles.h
  lld/ELF/Options.td
  lld/ELF/SyntheticSections.cpp
  lld/ELF/SyntheticSections.h
  lld/ELF/Target.h
  lld/ELF/Writer.cpp
  lld/docs/ld.lld.1
  lld/test/ELF/Inputs/x86-64-cet1.s
  lld/test/ELF/Inputs/x86-64-cet2.s
  lld/test/ELF/Inputs/x86-64-cet3.s
  lld/test/ELF/Inputs/x86-64-cet4.s
  lld/test/ELF/i386-cet.s
  lld/test/ELF/x86-64-cet.s
  llvm/include/llvm/Object/ELFTypes.h

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