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perf symbols: Fix symbol annotation for relocated kernel

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Kernel maps map memory addresses to file offsets.

For symbol annotation, objdump needs the object VMA addresses.  For an
unrelocated kernel, that is the same as the memory address.

The addresses passed to objdump for symbol annotation did not take into
account kernel relocation.

This patch fixes that.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Tested-by: Jiri Olsa <jolsa@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1391004884-10334-2-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2014-01-29 16:14:36 +02:00 committed by Arnaldo Carvalho de Melo
parent 6a02652df5
commit 9176753d1e
3 changed files with 6 additions and 2 deletions
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5
tools/perf/util/map.c
View file

@ -39,6 +39,7 @@ void map__init(struct map *map, enum map_type type,
map->start = start;
map->end = end;
map->pgoff = pgoff;
map->reloc = 0;
map->dso = dso;
map->map_ip = map__map_ip;
map->unmap_ip = map__unmap_ip;
@ -288,7 +289,7 @@ u64 map__rip_2objdump(struct map *map, u64 rip)
if (map->dso->rel)
return rip - map->pgoff;
return map->unmap_ip(map, rip);
return map->unmap_ip(map, rip) - map->reloc;
}
/**
@ -311,7 +312,7 @@ u64 map__objdump_2mem(struct map *map, u64 ip)
if (map->dso->rel)
return map->unmap_ip(map, ip + map->pgoff);
return ip;
return ip + map->reloc;
}
void map_groups__init(struct map_groups *mg)

1
tools/perf/util/map.h
View file

@ -36,6 +36,7 @@ struct map {
bool erange_warned;
u32 priv;
u64 pgoff;
u64 reloc;
u32 maj, min; /* only valid for MMAP2 record */
u64 ino; /* only valid for MMAP2 record */
u64 ino_generation;/* only valid for MMAP2 record */

2
tools/perf/util/symbol-elf.c
View file

@ -751,6 +751,8 @@ int dso__load_sym(struct dso *dso, struct map *map,
if (strcmp(elf_name, kmap->ref_reloc_sym->name))
continue;
kmap->ref_reloc_sym->unrelocated_addr = sym.st_value;
map->reloc = kmap->ref_reloc_sym->addr -
kmap->ref_reloc_sym->unrelocated_addr;
break;
}
}