Exception pointer/selector registers not specified

[ljmf00]

I couldn't find any relevant information about pointer/selector registers to be used for exception handling, for any RISC-V variant. According to this 1 LLVM patch, the values that they rely on are based on GCC implementation but it is fuzzy to find the origin of those. Stumbling upon the same issue on D runtime 2.

Would be cool to have a clarification of those register numbers on the documentation.

[kito-cheng]

Thanks for raise this issue, this should documented in psABI document, but I need some time to to figure out what's the right term in ABI document.