I'm currently discussing with glibc maintainers on the best approach to integrate this into the Linux userspace ecosystem. So far, discussions aim into a direction where glibc would own the __rseq_abi TLS symbol, and register it for every thread. I can then maintain a rseq library which consists of helper header files that contain the common rseq operations for all supported architectures.

I am concerned about providing a librseq that handles rseq registration for early adopters though, because I don't want projects to eventually end up conflicting with future glibc versions. Once we settled how glibc will expose the symbol and register it, I will try to provide a helper library which exposes this symbol and allow performing explicit rseq registration in a way that won't conflict with future glibc versions.