On Wed, 2022-04-06 at 10:23 -0700, Andrii Nakryiko wrote: > On Mon, Apr 4, 2022 at 4:42 PM Andrii Nakryiko <andrii@xxxxxxxxxx> > wrote: > > > > Add x86/x86_64-specific USDT argument specification parsing. Each > > architecture will require their own logic, as all this is arch- > > specific > > assembly-based notation. Architectures that libbpf doesn't support > > for > > USDTs will pr_warn() with specific error and return -ENOTSUP. > > > > We use sscanf() as a very powerful and easy to use string parser. > > Those > > spaces in sscanf's format string mean "skip any whitespaces", which > > is > > pretty nifty (and somewhat little known) feature. > > > > All this was tested on little-endian architecture, so bit shifts > > are > > probably off on big-endian, which our CI will hopefully prove. > > > > Reviewed-by: Alan Maguire <alan.maguire@xxxxxxxxxx> > > Reviewed-by: Dave Marchevsky <davemarchevsky@xxxxxx> > > Signed-off-by: Andrii Nakryiko <andrii@xxxxxxxxxx> > > --- > > Ilya, would you be interested in implementing at least some limited > support of USDT parameters for s390x? It would be good to have > big-endian platform supported and tested. aarch64 would be nice as > well, but I'm not sure who's the expert on that to help with. Sure, I'll give it a try. I see there is some support in bcc, which I can probably partially borrow.
