These were docmented in [1] (with the user-facing name of the opcode adjusted later in [2]).
Since MSVC 2022, the precompiled runtimes (both runtimes such as vcruntime140*.dll and the statically linked code from e.g. libcmt.lib) are built with pointer authentication enabled.
To correctly handle unwinding through such functions, even on HW that don't support the pointer authentication mechanism itself, wine needs to at least be aware of it (for handling the cases with packed unwind info with CR==2 simiarly to CR==3).
This patch has been tested on Linux on HW supporting pointer authentication too, with binaries built with MSVC.
[1] https://github.com/MicrosoftDocs/cpp-docs/commit/f510c83085d9764b3c7b5222197... [2] https://github.com/MicrosoftDocs/cpp-docs/commit/cac237d3f370a06b71f6c314a67...
-- v2: ntdll: Handle aarch64 pointer authentication in unwind info