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[ARM][KCFI] Add backend support for Kernel Control-Flow Integrity #163698

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Merged
kees merged 7 commits into from
Oct 23, 2025
Merged

[ARM][KCFI] Add backend support for Kernel Control-Flow Integrity #163698

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4885e37
[ARM][KCFI] Add backend support for Kernel Control-Flow Integrity
kees Oct 15, 2025
8340112
collapse createUnpackMachineBundles into addPreEmitPass with kcfi-che…
kees Oct 21, 2025
78b349c
Setting isPseudo = 1 is redundant to using PseudoInst
kees Oct 21, 2025
5bf2d7e
Thumb1 ScratchReg is always ARM::R2
kees Oct 21, 2025
f7dee70
add isRegisterLiveInCall() helper to clean up liveness tests
kees Oct 21, 2025
a463082
rearranged and regenerated tests to use utils/update_llc_test_checks.py
kees Oct 21, 2025
483c772
split KCFI_CHECK into subarch instructions to have Size defined with …
kees Oct 21, 2025
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3 changes: 2 additions & 1 deletion clang/lib/CodeGen/BackendUtil.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -687,7 +687,8 @@ static void addKCFIPass(const Triple &TargetTriple, const LangOptions &LangOpts,
PassBuilder &PB) {
// If the back-end supports KCFI operand bundle lowering, skip KCFIPass.
if (TargetTriple.getArch() == llvm::Triple::x86_64 ||
TargetTriple.isAArch64(64) || TargetTriple.isRISCV())
TargetTriple.isAArch64(64) || TargetTriple.isRISCV() ||
TargetTriple.isARM() || TargetTriple.isThumb())
return;

// Ensure we lower KCFI operand bundles with -O0.
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