Message ID | e27b74c5d94b240cb72ce0c7d6221acf758ebc8a.1418654436.git.naveen.n.rao@linux.vnet.ibm.com (mailing list archive) |
---|---|
State | Not Applicable |
Delegated to: | Michael Ellerman |
Headers | show |
Em Mon, Dec 15, 2014 at 08:20:38PM +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). So perhaps we should rename ARCH_SYMBOL_HANDLING to ARCH_ABI_SYMBOL_FIXUPS? > Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> > --- > Changes: > Generalize and introduce helper to post-process trace point. > > tools/perf/arch/powerpc/util/sym-handling.c | 17 +++++++++++++++++ > tools/perf/util/probe-event.c | 1 + > tools/perf/util/probe-event.h | 10 ++++++++++ > 3 files changed, 28 insertions(+) > > diff --git a/tools/perf/arch/powerpc/util/sym-handling.c b/tools/perf/arch/powerpc/util/sym-handling.c > index 22fc2e6..30c8797 100644 > --- a/tools/perf/arch/powerpc/util/sym-handling.c > +++ b/tools/perf/arch/powerpc/util/sym-handling.c > @@ -45,3 +45,20 @@ inline bool prefer_symtab(void) > return false; > #endif > } > + > +void arch_fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused, > + struct probe_trace_event *tev __maybe_unused, > + struct map *map __maybe_unused) > +{ > +#if defined(_CALL_ELF) && _CALL_ELF == 2 > + /* > + * If we used kallsyms, we should fixup the function entry address here. > + * ppc64 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) { > + tev->point.address += 8; > + tev->point.offset += 8; > + } > +#endif > +} > diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c > index dfc3151..85f37a4 100644 > --- a/tools/perf/util/probe-event.c > +++ b/tools/perf/util/probe-event.c > @@ -2340,6 +2340,7 @@ static int find_probe_trace_events_from_map(struct perf_probe_event *pev, > strdup_or_goto(pev->args[i].type, > nomem_out); > } > + arch_fix_tev_from_maps(pev, tev, map); > } > > out: > diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h > index 5f92906..335a6a4 100644 > --- a/tools/perf/util/probe-event.h > +++ b/tools/perf/util/probe-event.h > @@ -147,6 +147,16 @@ extern bool prefer_symtab(void); > static inline bool prefer_symtab(void) { return false; }; > #endif > > +#ifdef HAVE_ARCH_SYMBOL_HANDLING > +extern void arch_fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused, > + struct probe_trace_event *tev __maybe_unused, > + struct map *map __maybe_unused); > +#else > +static inline void arch_fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused, > + struct probe_trace_event *tev __maybe_unused, > + struct map *map __maybe_unused) { } > +#endif > + > /* Maximum index number of event-name postfix */ > #define MAX_EVENT_INDEX 1024 > > -- > 2.1.3
diff --git a/tools/perf/arch/powerpc/util/sym-handling.c b/tools/perf/arch/powerpc/util/sym-handling.c index 22fc2e6..30c8797 100644 --- a/tools/perf/arch/powerpc/util/sym-handling.c +++ b/tools/perf/arch/powerpc/util/sym-handling.c @@ -45,3 +45,20 @@ inline bool prefer_symtab(void) return false; #endif } + +void arch_fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused, + struct probe_trace_event *tev __maybe_unused, + struct map *map __maybe_unused) +{ +#if defined(_CALL_ELF) && _CALL_ELF == 2 + /* + * If we used kallsyms, we should fixup the function entry address here. + * ppc64 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) { + tev->point.address += 8; + tev->point.offset += 8; + } +#endif +} diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index dfc3151..85f37a4 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -2340,6 +2340,7 @@ static int find_probe_trace_events_from_map(struct perf_probe_event *pev, strdup_or_goto(pev->args[i].type, nomem_out); } + arch_fix_tev_from_maps(pev, tev, map); } out: diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h index 5f92906..335a6a4 100644 --- a/tools/perf/util/probe-event.h +++ b/tools/perf/util/probe-event.h @@ -147,6 +147,16 @@ extern bool prefer_symtab(void); static inline bool prefer_symtab(void) { return false; }; #endif +#ifdef HAVE_ARCH_SYMBOL_HANDLING +extern void arch_fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused, + struct probe_trace_event *tev __maybe_unused, + struct map *map __maybe_unused); +#else +static inline void arch_fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused, + struct probe_trace_event *tev __maybe_unused, + struct map *map __maybe_unused) { } +#endif + /* Maximum index number of event-name postfix */ #define MAX_EVENT_INDEX 1024
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). Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> --- Changes: Generalize and introduce helper to post-process trace point. tools/perf/arch/powerpc/util/sym-handling.c | 17 +++++++++++++++++ tools/perf/util/probe-event.c | 1 + tools/perf/util/probe-event.h | 10 ++++++++++ 3 files changed, 28 insertions(+)