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perf symbols: Fix annotation of vdso

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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>
This commit is contained in:
Adrian Hunter 2015-08-14 15:50:06 +03:00 committed by Arnaldo Carvalho de Melo
parent 3d7245b094
commit f0ee3b467a
1 changed files with 11 additions and 0 deletions
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11
tools/perf/util/symbol-elf.c
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@ -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