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>

diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index b0ad810..53bb5f5 100644 (file)
--- 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