RISC-V: Shadow Stack / Landing Pad Support

Hi Kito,

Regarding the subject, we are working with a RISC-V hardware platform that
does not provide native support for landing pad or shadow stack features.

As a result, we are exploring implementing (emulating) these mechanisms at
the compiler (GCC) and runtime levels.

Are you aware of any existing work, prior attempts, or ongoing efforts in
this direction?

Thank you and Good Day

~U