Messages in this thread Patch in this message | | | From | Dave Martin <> | Subject | [PATCH 1/1] perf symbols: ignore mapping symbols on ARM | Date | Mon, 9 Aug 2010 12:21:18 +0100 |
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Applies to linux-2.6-tip/master or acme/perf-core
ARM ELF files use symbols with special names $a, $t, $d to identify regions of ARM code, Thumb code and data within code sections. This can cause confusing output from the perf tools, especially for partially stripped binaries, or binaries containing user-added zero-sized symbols (which may occur in hand-written assembler which hasn't been fully annotated with .size directives).
This patch filters out these symbols at load time.
Signed-off-by: Dave Martin <dave.martin@linaro.org> --- tools/perf/util/symbol.c | 10 ++++++++++ 1 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index b6f5970..1a36773 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -1079,6 +1079,16 @@ static int dso__load_sym(struct dso *self, struct map *map, const char *name, if (!is_label && !elf_sym__is_a(&sym, map->type)) continue; + /* Reject ARM ELF "mapping symbols": these aren't unique and + * don't identify functions, so will confuse the profile + * output: */ + if (ehdr.e_machine == EM_ARM) { + if (!strcmp(elf_name, "$a") || + !strcmp(elf_name, "$d") || + !strcmp(elf_name, "$t")) + continue; + } + if (opdsec && sym.st_shndx == opdidx) { u32 offset = sym.st_value - opdshdr.sh_addr; u64 *opd = opddata->d_buf + offset; -- 1.7.0.4
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