From: Dave Martin Date: Mon, 9 Aug 2010 11:21:18 +0000 (+0100) Subject: perf symbols: Ignore mapping symbols on ARM X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=696b97a;p=linux-beck.git perf symbols: Ignore mapping symbols on ARM ARM ELF files use symbols with special names $a, $t, $d to identify regions of ARM code, Thumb code and data within code sections. This can cause confusing output from the perf tools, especially for partially stripped binaries, or binaries containing user-added zero-sized symbols (which may occur in hand-written assembler which hasn't been fully annotated with .size directives). This patch filters out these symbols at load time. LKML-Reference: <1281352878-8735-2-git-send-email-dave.martin@linaro.org> Signed-off-by: Dave Martin Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index b6f5970f9106..1a367734e016 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -1079,6 +1079,16 @@ static int dso__load_sym(struct dso *self, struct map *map, const char *name, if (!is_label && !elf_sym__is_a(&sym, map->type)) continue; + /* Reject ARM ELF "mapping symbols": these aren't unique and + * don't identify functions, so will confuse the profile + * output: */ + if (ehdr.e_machine == EM_ARM) { + if (!strcmp(elf_name, "$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;