rseq and gdb

Hi Florian,

I suspect that gdb should ideally do something to allow it to single-step
through rseq critical sections. In librseq [1], we emit the __rseq_cs_ptr_array
and __rseq_exit_point_array sections to allow gdb to know about rseq
critical sections and skip over those critical sections as needed. Otherwise
single-stepping over each instruction of a rseq critical section will loop
forever.

Now that glibc plans to enable rseq by default starting with glibc 2.35,
it appears to be a good timing to raise this topic with the gdb community.

Thanks,

Mathieu

[1] https://git.kernel.org/pub/scm/libs/librseq/librseq.git

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com