Messages in this thread | | | Date | Tue, 9 Dec 2014 18:14:00 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [RFC PATCH 8/8] perf probe powerpc: Fixup function entry if using kallsyms lookup |
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Em Tue, Dec 09, 2014 at 11:04:06PM +0530, Naveen N. Rao escreveu: > On powerpc ABIv2, if no debug-info is found and we use kallsyms, > we need to fixup the function entry to point to the local entry point. > Use offset of 8 since current toolchains always generate 2 > instructions (8 bytes).
Hi Michael and Ananth, may I have your Acked-by or Reviewed-by for these patches?
The ones, like this, that are affects only ppc I'm can assume was tested and applying it won't break other arch users, but having a/rev-by from ppc developers should speed up this process.
Thanks,
- Arnaldo
> Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> > --- > tools/perf/util/probe-event.c | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c > index adcdbd2..0970e2a 100644 > --- a/tools/perf/util/probe-event.c > +++ b/tools/perf/util/probe-event.c > @@ -2318,6 +2318,15 @@ static int find_probe_trace_events_from_map(struct perf_probe_event *pev, > } > /* Add one probe point */ > tp->address = map->unmap_ip(map, sym->start) + pp->offset; > +#if defined(__powerpc64__) && defined(_CALL_ELF) && _CALL_ELF == 2 > + /* > + * If we used kallsyms, we should fixup the function entry address here. > + * ppc64le ABIv2 local entry point is currently always 2 instructions (8 bytes) > + * after the global entry point. Fix this if it ever changes. > + */ > + if (!pev->uprobes && map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS) > + tp->address += 8; > +#endif > if (reloc_sym) { > tp->symbol = strdup_or_goto(reloc_sym->name, nomem_out); > tp->offset = tp->address - reloc_sym->addr; > -- > 2.1.3
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