[PATCH] D41723: Introduce the "retpoline" x86 mitigation technique for variant #2 of the speculative execution vulnerabilities disclosed today, specifically identified by CVE-2017-5715, "Branch Target Injection", and is one of the two halves to Spectre..

[Chandler Carruth via Phabricator via llvm-commits]

chandlerc updated this revision to Diff 128698.
chandlerc added a comment.

Add support for externally provided thunks. This is an independent feature;
when combined with the overall retpoline feature it suppresses the thunk
emission and rotates the names to be distinct names that an external build
system for the kernel (for example) can provide.

I've added some minimal documentation about the semantic requirements of these
thunks to the commit log, although it is fairly obvious. More comprehensive
documentation will be part of the large follow-up effort around docs.

Also adds Rui's work to provide more efficient PLT thunks.

Also addresses remaining feedback from Ahmed.


https://reviews.llvm.org/D41723

Files:
  clang/include/clang/Driver/Options.td
  clang/lib/Basic/Targets/X86.cpp
  clang/lib/Basic/Targets/X86.h
  clang/test/Driver/x86-target-features.c
  lld/ELF/Arch/X86.cpp
  lld/ELF/Arch/X86_64.cpp
  lld/ELF/Config.h
  lld/ELF/Driver.cpp
  lld/test/ELF/i386-retpoline-nopic.s
  lld/test/ELF/i386-retpoline-pic.s
  lld/test/ELF/x86-64-retpoline-znow.s
  lld/test/ELF/x86-64-retpoline.s
  llvm/include/llvm/CodeGen/Passes.h
  llvm/include/llvm/CodeGen/TargetLowering.h
  llvm/include/llvm/CodeGen/TargetPassConfig.h
  llvm/include/llvm/CodeGen/TargetSubtargetInfo.h
  llvm/include/llvm/InitializePasses.h
  llvm/lib/CodeGen/CMakeLists.txt
  llvm/lib/CodeGen/CodeGen.cpp
  llvm/lib/CodeGen/IndirectBrExpandPass.cpp
  llvm/lib/CodeGen/TargetPassConfig.cpp
  llvm/lib/CodeGen/TargetSubtargetInfo.cpp
  llvm/lib/Target/X86/CMakeLists.txt
  llvm/lib/Target/X86/X86.h
  llvm/lib/Target/X86/X86.td
  llvm/lib/Target/X86/X86AsmPrinter.h
  llvm/lib/Target/X86/X86FastISel.cpp
  llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/lib/Target/X86/X86ISelLowering.h
  llvm/lib/Target/X86/X86InstrCompiler.td
  llvm/lib/Target/X86/X86InstrControl.td
  llvm/lib/Target/X86/X86InstrInfo.td
  llvm/lib/Target/X86/X86RetpolineThunks.cpp
  llvm/lib/Target/X86/X86Subtarget.cpp
  llvm/lib/Target/X86/X86Subtarget.h
  llvm/lib/Target/X86/X86TargetMachine.cpp
  llvm/test/CodeGen/X86/O0-pipeline.ll
  llvm/test/CodeGen/X86/retpoline.ll
  llvm/test/Transforms/IndirectBrExpand/basic.ll
  llvm/tools/opt/opt.cpp

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