[all-commits] [llvm/llvm-project] 502994: [PAC][llvm-readobj][AArch64][ELF] Support `GNU_PRO...

[Daniil Kovalev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5029949952f4dc745dcb7799c7449a02fe8309c3
      https://github.com/llvm/llvm-project/commit/5029949952f4dc745dcb7799c7449a02fe8309c3
  Author: Daniil Kovalev <dkovalev at accesssoftek.com>
  Date:   2024-04-03 (Wed, 03 Apr 2024)

  Changed paths:
    M llvm/include/llvm/BinaryFormat/ELF.h
    M llvm/test/tools/llvm-readobj/ELF/AArch64/aarch64-feature-pauth.s
    M llvm/test/tools/llvm-readobj/ELF/AArch64/aarch64-note-gnu-property.s
    M llvm/tools/llvm-readobj/ELFDumper.cpp

  Log Message:
  -----------
  [PAC][llvm-readobj][AArch64][ELF] Support `GNU_PROPERTY_AARCH64_FEATURE_PAUTH` (#85231)

This adds support for `GNU_PROPERTY_AARCH64_FEATURE_PAUTH` feature (as
defined in https://github.com/ARM-software/abi-aa/pull/240) handling in
llvm-readobj and llvm-readelf. The following constants for supported
platforms are also introduced:

- `AARCH64_PAUTH_PLATFORM_INVALID = 0x0`
- `AARCH64_PAUTH_PLATFORM_BAREMETAL = 0x1`
- `AARCH64_PAUTH_PLATFORM_LLVM_LINUX = 0x10000002`

For the llvm_linux platform, output of the tools contains descriptions
of PAuth features which are enabled/disabled depending on the version
value. Version value bits correspond to the following `LangOptions`
defined in #85232:

- bit 0: `PointerAuthIntrinsics`;
- bit 1: `PointerAuthCalls`;
- bit 2: `PointerAuthReturns`;
- bit 3: `PointerAuthAuthTraps`;
- bit 4: `PointerAuthVTPtrAddressDiscrimination`;
- bit 5: `PointerAuthVTPtrTypeDiscrimination`;
- bit 6: `PointerAuthInitFini`.

Support for `.note.AARCH64-PAUTH-ABI-tag` is dropped since it's deleted
from the spec in ARM-software/abi-aa#250.



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