The low level interface is documented at https://github.com/compudj/librseq/blob/master/include/rseq/pseudocode.h https://github.com/compudj/librseq/blob/master

The low level interface is documented at https://github.com/compudj/librseq/blob/master/include/rseq/pseudocode.h https://github.com/compudj/librseq/blob/master/include/rseq/..., the list is just an internal implementation detail. The syscall these days is invoked by libc not the program; libc provides access to some symbols that let the program execute rseqs as well.