linux-kernel - [PATCH 06/14] perf symbols: Fix annotation of vdso

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Message-Id: <1439838727-6824-7-git-send-email-acme@kernel.org>
Date:	Mon, 17 Aug 2015 16:11:59 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...el.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Will Deacon <will.deacon@....com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 06/14] perf symbols: Fix annotation of vdso

From: Adrian Hunter <adrian.hunter@...el.com>

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>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Will Deacon <will.deacon@....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@...hat.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
-- 
2.1.0

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