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| author | Dave Martin <dave.martin@linaro.org> | 2010-08-09 12:21:18 +0100 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2010-08-10 16:10:36 -0300 |
| commit | 696b97a5d2de9e2b22699300835e675dfffe8592 (patch) | |
| tree | f8e05f9c7b1f2983268c56daf2c6e586addb387c | |
| parent | b1b0267336b1b74eeb8884bac4be96296b719e67 (diff) | |
| download | op-kernel-dev-696b97a5d2de9e2b22699300835e675dfffe8592.zip op-kernel-dev-696b97a5d2de9e2b22699300835e675dfffe8592.tar.gz | |
perf symbols: Ignore mapping symbols on ARM
ARM ELF files use symbols with special names $a, $t, $d to identify regions of
ARM code, Thumb code and data within code sections. This can cause confusing
output from the perf tools, especially for partially stripped binaries, or
binaries containing user-added zero-sized symbols (which may occur in
hand-written assembler which hasn't been fully annotated with .size
directives).
This patch filters out these symbols at load time.
LKML-Reference: <1281352878-8735-2-git-send-email-dave.martin@linaro.org>
Signed-off-by: Dave Martin <dave.martin@linaro.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| -rw-r--r-- | tools/perf/util/symbol.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index b6f5970..1a36773 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -1079,6 +1079,16 @@ static int dso__load_sym(struct dso *self, struct map *map, const char *name, if (!is_label && !elf_sym__is_a(&sym, map->type)) continue; + /* Reject ARM ELF "mapping symbols": these aren't unique and + * don't identify functions, so will confuse the profile + * output: */ + if (ehdr.e_machine == EM_ARM) { + if (!strcmp(elf_name, "$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; |
