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authorDave Martin <dave.martin@linaro.org>2010-08-09 12:21:18 +0100
committerArnaldo Carvalho de Melo <acme@redhat.com>2010-08-10 16:10:36 -0300
commit696b97a5d2de9e2b22699300835e675dfffe8592 (patch)
treef8e05f9c7b1f2983268c56daf2c6e586addb387c /tools
parentb1b0267336b1b74eeb8884bac4be96296b719e67 (diff)
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perf symbols: Ignore mapping symbols on ARM
ARM ELF files use symbols with special names $a, $t, $d to identify regions of ARM code, Thumb code and data within code sections. This can cause confusing output from the perf tools, especially for partially stripped binaries, or binaries containing user-added zero-sized symbols (which may occur in hand-written assembler which hasn't been fully annotated with .size directives). This patch filters out these symbols at load time. LKML-Reference: <1281352878-8735-2-git-send-email-dave.martin@linaro.org> Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/symbol.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index b6f5970f910..1a367734e01 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1079,6 +1079,16 @@ static int dso__load_sym(struct dso *self, struct map *map, const char *name,
if (!is_label && !elf_sym__is_a(&sym, map->type))
continue;
+ /* Reject ARM ELF "mapping symbols": these aren't unique and
+ * don't identify functions, so will confuse the profile
+ * output: */
+ if (ehdr.e_machine == EM_ARM) {
+ if (!strcmp(elf_name, "$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;