Messages in this thread Patch in this message | | | From | Arnaldo Carvalho de Melo <> | Subject | [PATCH 03/23] perf symbols: Record text offset in dso to calculate objdump address | Date | Wed, 23 Mar 2016 18:17:40 -0300 |
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From: Wang Nan <wangnan0@huawei.com>
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 45ec4d0a50ed..ef3dbc989013 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 b1dd68f358fc..bc229a74c6a9 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); /* -- 2.5.5
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