From 73cdf0c6ea9c597894924f3b91ad636389555c1b Mon Sep 17 00:00:00 2001
From: Wang Nan <wangnan0@huawei.com>
Date: Fri, 26 Feb 2016 09:31:49 +0000
Subject: [PATCH] perf symbols: Record text offset in dso to calculate objdump
address
Store DSO's .text offset into DSO, used for VDSOs and will also be used for
other needs, like handling kernel modules.
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Cody P Schafer <dev@codyps.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kirill Smelkov <kirr@nexedi.com>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1456479154-136027-2-git-send-email-wangnan0@huawei.com
[ Extracted from larger patch ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/dso.h | 1 +
tools/perf/util/symbol-elf.c | 12 ++++++------
2 files changed, 7 insertions(+), 6 deletions(-)
diff --git a/tools/perf/util/dso.h b/tools/perf/util/dso.h
index 45ec4d0a50eda..ef3dbc9890139 100644
--- a/tools/perf/util/dso.h
+++ b/tools/perf/util/dso.h
@@ -162,6 +162,7 @@ struct dso {
u8 loaded;
u8 rel;
u8 build_id[BUILD_ID_SIZE];
+ u64 text_offset;
const char *short_name;
const char *long_name;
u16 long_name_len;
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index b1dd68f358fcd..bc229a74c6a9a 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -793,6 +793,7 @@ int dso__load_sym(struct dso *dso, struct map *map,
uint32_t idx;
GElf_Ehdr ehdr;
GElf_Shdr shdr;
+ GElf_Shdr tshdr;
Elf_Data *syms, *opddata = NULL;
GElf_Sym sym;
Elf_Scn *sec, *sec_strndx;
@@ -832,6 +833,9 @@ int dso__load_sym(struct dso *dso, struct map *map,
sec = syms_ss->symtab;
shdr = syms_ss->symshdr;
+ if (elf_section_by_name(elf, &ehdr, &tshdr, ".text", NULL))
+ dso->text_offset = tshdr.sh_addr - tshdr.sh_offset;
+
if (runtime_ss->opdsec)
opddata = elf_rawdata(runtime_ss->opdsec, NULL);
@@ -880,12 +884,8 @@ 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;
- }
+ if (dso__is_vdso(dso))
+ map->reloc = map->start - dso->text_offset;
dso->adjust_symbols = runtime_ss->adjust_symbols || ref_reloc(kmap);
/*
--
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