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authorKirill Smelkov <kirr@landau.phys.spbu.ru>2010-02-03 16:52:07 -0200
committerIngo Molnar <mingo@elte.hu>2010-02-04 09:33:27 +0100
commit7a2b6209863626cf8362e5ff4653491558f91e67 (patch)
tree76c8c3b92577033814c7bf4dce1858fc682fbf32 /tools/perf/util
parent29a9f66d703cb9464e24084e09edab5683e1b6b8 (diff)
perf annotate: Fix it for non-prelinked *.so
The problem was we were incorrectly calculating objdump addresses for sym->start and sym->end, look: For simple ET_DYN type DSO (*.so) with one function, objdump -dS output is something like this: 000004ac <my_strlen>: int my_strlen(const char *s) 4ac: 55 push %ebp 4ad: 89 e5 mov %esp,%ebp 4af: 83 ec 10 sub $0x10,%esp { i.e. we have relative-to-dso-mapping IPs (=RIP) there. For ET_EXEC type and probably for prelinked libs as well (sorry can't test - I don't use prelink) objdump outputs absolute IPs, e.g. 08048604 <zz_strlen>: extern "C" int zz_strlen(const char *s) 8048604: 55 push %ebp 8048605: 89 e5 mov %esp,%ebp 8048607: 83 ec 10 sub $0x10,%esp { So, if sym->start is always relative to dso mapping(*), we'll have to unmap it for ET_EXEC like cases, and leave as is for ET_DYN cases. (*) and it is - we've explicitely made it relative. Look for adjust_symbols handling in dso__load_sym() Previously we were always unmapping sym->start and for ET_DYN dsos resulting addresses were wrong, and so objdump output was empty. The end result was that perf annotate output for symbols from non-prelinked *.so had always 0.00% percents only, which is wrong. To fix it, let's introduce a helper for converting rip to objdump address, and also let's document what map_ip() and unmap_ip() do -- I had to study sources for several hours to understand it. Signed-off-by: Kirill Smelkov <kirr@landau.phys.spbu.ru> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Mike Galbraith <efault@gmx.de> LKML-Reference: <1265223128-11786-8-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/util')
-rw-r--r--tools/perf/util/map.c12
-rw-r--r--tools/perf/util/map.h9
2 files changed, 21 insertions, 0 deletions
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index f6626cc3df2..af5805f5131 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -210,3 +210,15 @@ size_t map__fprintf(struct map *self, FILE *fp)
return fprintf(fp, " %Lx-%Lx %Lx %s\n",
self->start, self->end, self->pgoff, self->dso->name);
}
+
+/*
+ * objdump wants/reports absolute IPs for ET_EXEC, and RIPs for ET_DYN.
+ * map->dso->adjust_symbols==1 for ET_EXEC-like cases.
+ */
+u64 map__rip_2objdump(struct map *map, u64 rip)
+{
+ u64 addr = map->dso->adjust_symbols ?
+ map->unmap_ip(map, rip) : /* RIP -> IP */
+ rip;
+ return addr;
+}
diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index de048399d77..9cee9c788db 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -26,8 +26,12 @@ struct map {
u64 end;
enum map_type type;
u64 pgoff;
+
+ /* ip -> dso rip */
u64 (*map_ip)(struct map *, u64);
+ /* dso rip -> ip */
u64 (*unmap_ip)(struct map *, u64);
+
struct dso *dso;
};
@@ -56,6 +60,11 @@ static inline u64 identity__map_ip(struct map *map __used, u64 ip)
return ip;
}
+
+/* rip -> addr suitable for passing to `objdump --start-address=` */
+u64 map__rip_2objdump(struct map *map, u64 rip);
+
+
struct symbol;
struct mmap_event;