Aarch64 ELF files use mapping symbols with special names $x, $d
to identify regions of Aarch64 code (see Aarch64 ELF ABI - "ARM
IHI 0056B", section "4.5.4 Mapping symbols").
The patch filters out these symbols at load time, similar to
"696b97a perf symbols: Ignore mapping symbols on ARM" changes
done for ARM before V8.
Also added handling of mapping symbols that has format
"$d.<any>" and similar for both cases.
Note we are not making difference between EM_ARM and
EM_AARCH64 mapping symbols instead code handles superset
of both.
Signed-off-by: Victor Kamensky <victor.kamen...@linaro.org>
Acked-by: Will Deacon <will.dea...@arm.com>
Cc: Peter Zijlstra <a.p.zijls...@chello.nl>
Cc: Paul Mackerras <pau...@samba.org>
Cc: Ingo Molnar <mi...@redhat.com>
Cc: Arnaldo Carvalho de Melo <a...@kernel.org>
Cc: Adrian Hunter <adrian.hun...@intel.com>
Cc: Jiri Olsa <jo...@redhat.com>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Avi Kivity <a...@cloudius-systems.com>
Cc: Masami Hiramatsu <masami.hiramatsu...@hitachi.com>
Cc: Anton Blanchard <an...@samba.org>
Cc: David Ahern <dsah...@gmail.com>
Cc: Will Deacon <will.dea...@arm.com>
Cc: Russell King <li...@arm.linux.org.uk>
Cc: Dave Martin <dave.mar...@arm.com>
---
tools/perf/util/symbol-elf.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c
index 06fcd1b..8fc6e2f 100644
--- a/tools/perf/util/symbol-elf.c
+++ b/tools/perf/util/symbol-elf.c
@@ -856,10 +856,9 @@ int dso__load_sym(struct dso *dso, struct map *map,
/* 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, "$t"))
+ if (ehdr.e_machine == EM_ARM || ehdr.e_machine == EM_AARCH64) {
+ if (elf_name[0] == '$' && strchr("adtx", elf_name[1])
+ && (elf_name[2] == '\0' || elf_name[2] == '.'))
continue;
}
--
1.9.3
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