LLVM 8
Highlights- Initial support for Armv8.3-A Pointer Authentication in llvm, libunwind and DWARF.
LLVM 9
Highlights- lld: new flag: --pac-plt to support signed plts.
- lld: emit DT_AARCH64_PAC_PLT dynamic tag.
- lld: automatic generation of pac-plt (signed plt) if PAuth is enabled, mandates dynamic loader support.
- llvm-readobj: .note.gnu.property section support
- llvm-readobj: DT_AARCH64_PAC_PLT dynamic tag support
LLVM 10
Highlights- lld: --pac-plt became -z pac-plt
- lld: PT_GNU_PROPERTY support
- lld: various fixes around .note.gnu.property section.
- Emission of PAC flag into .note.gnu.property section.
- Hint instructions are emitted into assembly for pre Armv8.3-A targets.
- Outlined functions are return-address-signed.
- Added support for __attribute__((target("branch-protection=..."))) function attribute
LLVM11
Highlights- clang: __ARM_FEATURE_PAC_DEFAULT is added
- lld: pac-plt (signed plt) is only generated when -z pac-plt is set.
LLVM12 * (Planned)
Highlights- __builtin_return_address: XPACLRI (before Armv8.3-A) or XPACI (Armv8.3-A and later) strips the PAC bits from the address.
- Functions generated internally by LLVM now respect compilation flags: PAuth instructions are inserted into them as well.
- Bugfix: .note.gnu.property does not claim PAuth support if -mbranch-protection does not enable pac-ret.