perf probe ppc64le: Fixup function entry if using kallsyms lookup

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>
Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/92253021e77a104b23b615c8c23bf9501dfe60bf.1430217967.git.naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/arch/powerpc/util/sym-handling.c b/tools/perf/arch/powerpc/util/sym-handling.c
index a170060..bbc1a50 100644 (file)
--- a/tools/perf/arch/powerpc/util/sym-handling.c
+++ b/tools/perf/arch/powerpc/util/sym-handling.c
@@ -64,4 +64,19 @@ bool arch__prefers_symtab(void)
 {
        return true;
 }
+
+#define PPC64LE_LEP_OFFSET     8
+
+void arch__fix_tev_from_maps(struct perf_probe_event *pev,
+                            struct probe_trace_event *tev, struct map *map)
+{
+       /*
+        * ppc64 ABIv2 local entry point is currently always 2 instructions
+        * (8 bytes) after the global entry point.
+        */
+       if (!pev->uprobes && map->dso->symtab_type == DSO_BINARY_TYPE__KALLSYMS) {
+               tev->point.address += PPC64LE_LEP_OFFSET;
+               tev->point.offset += PPC64LE_LEP_OFFSET;
+       }
+}
 #endif

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 4dfb412..eb75a5e 100644 (file)
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -2447,6 +2447,10 @@ static int find_probe_functions(struct map *map, char *name)
 #define strdup_or_goto(str, label)     \
        ({ char *__p = strdup(str); if (!__p) goto label; __p; })
 
+void __weak arch__fix_tev_from_maps(struct perf_probe_event *pev __maybe_unused,
+                               struct probe_trace_event *tev __maybe_unused,
+                               struct map *map __maybe_unused) { }
+
 /*
  * Find probe function addresses from map.
  * Return an error or the number of found probe_trace_event
@@ -2553,6 +2557,7 @@ 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 52bca4b..180f142 100644 (file)
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -136,6 +136,8 @@ extern int show_available_vars(struct perf_probe_event *pevs, int npevs,
 extern int show_available_funcs(const char *module, struct strfilter *filter,
                                bool user);
 bool arch__prefers_symtab(void);
+void arch__fix_tev_from_maps(struct perf_probe_event *pev,
+                            struct probe_trace_event *tev, struct map *map);
 
 /* Maximum index number of event-name postfix */
 #define MAX_EVENT_INDEX        1024