[all-commits] [llvm/llvm-project] 365bdd: [hwasan] Add intrinsics for fixed shadow on Aarch6...

[Thurston Dang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 365bddf634993d5ea357e9715d8aacd7ee40c4b5
      https://github.com/llvm/llvm-project/commit/365bddf634993d5ea357e9715d8aacd7ee40c4b5
  Author: Thurston Dang <thurston at google.com>
  Date:   2024-04-22 (Mon, 22 Apr 2024)

  Changed paths:
    M llvm/include/llvm/IR/Intrinsics.td
    M llvm/lib/Target/AArch64/AArch64AsmPrinter.cpp
    M llvm/lib/Target/AArch64/AArch64InstrInfo.td
    M llvm/test/CodeGen/AArch64/hwasan-check-memaccess-fixedshadow.ll

  Log Message:
  -----------
  [hwasan] Add intrinsics for fixed shadow on Aarch64 (#89319)

This patch introduces HWASan memaccess intrinsics that assume a fixed
shadow (with the offset provided by --hwasan-mapping-offset=...), with
and without short granule support.

The behavior of HWASan is not meaningfully changed by this patch;
future work ("Optimize outlined memaccess for
fixed shadow on Aarch64": https://github.com/llvm/llvm-project/pull/88544) will make HWASan use these intrinsics.

We currently only support lowering the LLVM IR intrinsic to AArch64.

The test case is adapted from hwasan-check-memaccess.ll.



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