diff options
| author |   Adrian Hunter <adrian.hunter@intel.com> | 2015-08-14 15:50:06 +0300 |
|---|---|---|
| committer |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-08-17 11:07:38 -0300 |
| commit | f0ee3b467ab7a74ffce75190259eb59dbf30ecad (patch) | |
| tree | 3af9b8c6edd012f9cadd7d1375bb7cac05ec60d6 /tools/perf/util/symbol-elf.c | |
| parent | perf annotate: Fix 32-bit compilation error in util/annotate.c (diff) | |
| download | wireguard-linux-f0ee3b467ab7a74ffce75190259eb59dbf30ecad.tar.xz wireguard-linux-f0ee3b467ab7a74ffce75190259eb59dbf30ecad.zip | |
perf symbols: Fix annotation of vdso
Older kernels attempt to prelink vdso to its virtual address. To permit
annotation using objdump, the map__rip_2objdump() calculation must
result in that same address which we can infer from the start and offset
of the text section.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Will Deacon <will.deacon@arm.com>
Link: http://lkml.kernel.org/r/1439556606-11297-1-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/symbol-elf.c')
| -rw-r--r-- | tools/perf/util/symbol-elf.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c index b0ad810f04dd..53bb5f59ec58 100644 --- a/tools/perf/util/symbol-elf.c +++ b/tools/perf/util/symbol-elf.c @@ -875,6 +875,17 @@ int dso__load_sym(struct dso *dso, struct map *map, } } + /* + * Handle any relocation of vdso necessary because older kernels + * attempted to prelink vdso to its virtual address. + */ + if (dso__is_vdso(dso)) { + GElf_Shdr tshdr; + + if (elf_section_by_name(elf, &ehdr, &tshdr, ".text", NULL)) + map->reloc = map->start - tshdr.sh_addr + tshdr.sh_offset; + } + dso->adjust_symbols = runtime_ss->adjust_symbols || ref_reloc(kmap); /* * Initial kernel and module mappings do not map to the dso. For |