On Mon., Feb. 8, 2021, 3:00 a.m. Nadav Har'El, <[email protected]> wrote:
> On Wed, Feb 3, 2021 at 1:18 AM Waldek Kozaczuk <[email protected]> > wrote: > >> Currently, it is only possible to connect from gdb to a running instance >> of OSv on QEMU. But ideally, it would be nice to have a gdb stub in OSv >> that would let one connect from gdb to OSv running on any hypervisor. >> >> Per this fragment of this Wiki - >> https://github.com/cloudius-systems/osv/wiki/Debugging-OSv >> >> *"The fact that our gdb support works with the unit of cpus, not OSV >> threads, makes it convenient to debug OSV itself, but less convenient to >> debug application code running inside OSV. Particularly problematic is >> single stepping support which isn’t currently supported well: The problem >> is that when you try to look at a single OSV thread (see the next section), >> a single-step operation (“s” or “n”) makes one step inside the vcpu, not >> the osv thread*, and this step might include switching to a different >> thread. One way to work around this problem is to compile OSV with >> preemption disabled (not recommended, but can be a convenient trick in some >> debugging situations). *A better approach would have been to include a >> gdb stub into OSV itself, to allow gdb to see OSV threads directly and >> single-step them. We’ve made some progress in implementing such a stub, but >> it isn’t ready for prime-time yet.*" >> >> it looks like somebody may have implemented an initial version of the gdb >> stub. Is there a working patch of it somewhere? >> > > I have a vague recollection - it was many years ago - that Glauber (CCed) > was the one who tried doing it. > Glauber, if it was you, do you remember what you tried? > If it wasn't you, sorry for the spam :-) > I don't think it was me. I have no memory of ever doing this. But no need to be sorry, it's good to hear from you! > > >> Regards, >> Waldek >> >> -- >> You received this message because you are subscribed to the Google Groups >> "OSv Development" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/osv-dev/a3ca8d68-5994-4b51-94c4-539e2024f12dn%40googlegroups.com >> <https://groups.google.com/d/msgid/osv-dev/a3ca8d68-5994-4b51-94c4-539e2024f12dn%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "OSv Development" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/osv-dev/CAA6-i6rAWgYqkCOPnGiQABpEfC%3DKqD1jCmmw82LEmrCNrHWyqA%40mail.gmail.com.
