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perf symbols: Ignore mapping symbols on aarch64

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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.kamensky@linaro.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Anton Blanchard <anton@samba.org>
Cc: Avi Kivity <avi@cloudius-systems.com>
Cc: Dave Martin <Dave.Martin@arm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Russell King <linux@arm.linux.org.uk>
Link: http://lkml.kernel.org/r/1422340442-4673-2-git-send-email-victor.kamensky@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Victor Kamensky 2015-01-26 22:34:01 -08:00 • committed by Arnaldo Carvalho de Melo
parent 8b72805fd1
commit 4886f2ca19
1 changed files with 3 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

7
tools/perf/util/symbol-elf.c
View file

@ -859,10 +859,9 @@ int dso__load_sym(struct dso *dso, struct map *map,
/* Reject ARM ELF "mapping symbols": these aren't unique and /* Reject ARM ELF "mapping symbols": these aren't unique and
* don't identify functions, so will confuse the profile * don't identify functions, so will confuse the profile
* output: */ * output: */
if (ehdr.e_machine == EM_ARM) { if (ehdr.e_machine == EM_ARM || ehdr.e_machine == EM_AARCH64) {
if (!strcmp(elf_name, "$a") || if (elf_name[0] == '$' && strchr("adtx", elf_name[1])
!strcmp(elf_name, "$d") || && (elf_name[2] == '\0' || elf_name[2] == '.'))
!strcmp(elf_name, "$t"))
continue; continue;
} }