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Date: Fri, 14 Aug 2015 15:50:06 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...hat.com>,
Will Deacon <will.deacon@....com>
Subject: [PATCH] perf tools: 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@...el.com>
---
tools/perf/util/symbol-elf.c | 11 +++++++++++
1 file changed, 11 insertions(+)
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
--
1.9.1
--
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