]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commitdiff
perf symbols: Fix annotation of vdso
authorAdrian Hunter <adrian.hunter@intel.com>
Fri, 14 Aug 2015 12:50:06 +0000 (15:50 +0300)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Mon, 17 Aug 2015 14:07:38 +0000 (11:07 -0300)
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>
tools/perf/util/symbol-elf.c

index b0ad810f04dd6b536ccd5468b19a610068c4e1a8..53bb5f59ec589c22f7b1cd211cb132a3ca98d702 100644 (file)
@@ -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