From: Remi Bernon Date: Fri, 21 Aug 2020 16:52:37 +0000 (+0200) Subject: perf symbols: Try reading the symbol table with libbfd X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=eac9a4342e5447cade4d484261a8992e2ec6f138;p=linux.git perf symbols: Try reading the symbol table with libbfd Wine generates PE binaries for its code modules and also generates debug files in PE or PDB formats, which perf cannot parse either. Trying to read symbols on non-ELF binaries with libbfd, when supported, makes it possible for perf to report symbols and annotations for Windows applications running under Wine. Because libbfd doesn't provide symbol size (probably because of some backends not supporting it), we compute it by first sorting the symbols by addresses and then considering that they are sequential in a given section. v3: Also include local and weak bfd symbols and mark them as such, only global symbols were previously reported, and that caused a very imprecise address to symbol resolution. Signed-off-by: Remi Bernon Acked-by: Jiri Olsa Cc: Alexander Shishkin Cc: Jacek Caban Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lore.kernel.org/lkml/20200821165238.1340315-2-rbernon@codeweavers.com Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index 5151a8c0b791a..5ddf76fb691c2 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -1526,6 +1526,138 @@ out_failure: return -1; } +#ifdef HAVE_LIBBFD_SUPPORT +#define PACKAGE 'perf' +#include + +static int bfd_symbols__cmpvalue(const void *a, const void *b) +{ + const asymbol *as = *(const asymbol **)a, *bs = *(const asymbol **)b; + + if (bfd_asymbol_value(as) != bfd_asymbol_value(bs)) + return bfd_asymbol_value(as) - bfd_asymbol_value(bs); + + return bfd_asymbol_name(as)[0] - bfd_asymbol_name(bs)[0]; +} + +static int bfd2elf_binding(asymbol *symbol) +{ + if (symbol->flags & BSF_WEAK) + return STB_WEAK; + if (symbol->flags & BSF_GLOBAL) + return STB_GLOBAL; + if (symbol->flags & BSF_LOCAL) + return STB_LOCAL; + return -1; +} + +int dso__load_bfd_symbols(struct dso *dso, const char *debugfile) +{ + int err = -1; + long symbols_size, symbols_count; + asection *section; + asymbol **symbols, *sym; + struct symbol *symbol; + bfd *abfd; + u_int i; + u64 start, len; + + abfd = bfd_openr(dso->long_name, NULL); + if (!abfd) + return -1; + + if (!bfd_check_format(abfd, bfd_object)) { + pr_debug2("%s: cannot read %s bfd file.\n", __func__, + dso->long_name); + goto out_close; + } + + if (bfd_get_flavour(abfd) == bfd_target_elf_flavour) + goto out_close; + + section = bfd_get_section_by_name(abfd, ".text"); + if (section) + dso->text_offset = section->vma - section->filepos; + + bfd_close(abfd); + + abfd = bfd_openr(debugfile, NULL); + if (!abfd) + return -1; + + if (!bfd_check_format(abfd, bfd_object)) { + pr_debug2("%s: cannot read %s bfd file.\n", __func__, + debugfile); + goto out_close; + } + + if (bfd_get_flavour(abfd) == bfd_target_elf_flavour) + goto out_close; + + symbols_size = bfd_get_symtab_upper_bound(abfd); + if (symbols_size == 0) { + bfd_close(abfd); + return 0; + } + + if (symbols_size < 0) + goto out_close; + + symbols = malloc(symbols_size); + if (!symbols) + goto out_close; + + symbols_count = bfd_canonicalize_symtab(abfd, symbols); + if (symbols_count < 0) + goto out_free; + + qsort(symbols, symbols_count, sizeof(asymbol *), bfd_symbols__cmpvalue); + +#ifdef bfd_get_section +#define bfd_asymbol_section bfd_get_section +#endif + for (i = 0; i < symbols_count; ++i) { + sym = symbols[i]; + section = bfd_asymbol_section(sym); + if (bfd2elf_binding(sym) < 0) + continue; + + while (i + 1 < symbols_count && + bfd_asymbol_section(symbols[i + 1]) == section && + bfd2elf_binding(symbols[i + 1]) < 0) + i++; + + if (i + 1 < symbols_count && + bfd_asymbol_section(symbols[i + 1]) == section) + len = symbols[i + 1]->value - sym->value; + else + len = section->size - sym->value; + + start = bfd_asymbol_value(sym) - dso->text_offset; + symbol = symbol__new(start, len, bfd2elf_binding(sym), STT_FUNC, + bfd_asymbol_name(sym)); + if (!symbol) + goto out_free; + + symbols__insert(&dso->symbols, symbol); + } +#ifdef bfd_get_section +#undef bfd_asymbol_section +#endif + + symbols__fixup_end(&dso->symbols); + symbols__fixup_duplicate(&dso->symbols); + dso->adjust_symbols = 1; + + err = 0; +out_free: + free(symbols); +out_close: + bfd_close(abfd); + return err; +} +#endif + static bool dso__is_compatible_symtab_type(struct dso *dso, bool kmod, enum dso_binary_type type) { @@ -1699,6 +1831,7 @@ int dso__load(struct dso *dso, struct map *map) bool next_slot = false; bool is_reg; bool nsexit; + int bfdrc = -1; int sirc = -1; enum dso_binary_type symtab_type = binary_type_symtab[i]; @@ -1717,12 +1850,19 @@ int dso__load(struct dso *dso, struct map *map) nsinfo__mountns_exit(&nsc); is_reg = is_regular_file(name); +#ifdef HAVE_LIBBFD_SUPPORT if (is_reg) + bfdrc = dso__load_bfd_symbols(dso, name); +#endif + if (is_reg && bfdrc < 0) sirc = symsrc__init(ss, dso, name, symtab_type); if (nsexit) nsinfo__mountns_enter(dso->nsinfo, &nsc); + if (bfdrc == 0) + break; + if (!is_reg || sirc < 0) continue; diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h index ff4f4c47e1484..11fe71f46d143 100644 --- a/tools/perf/util/symbol.h +++ b/tools/perf/util/symbol.h @@ -175,6 +175,10 @@ int symbol__config_symfs(const struct option *opt __maybe_unused, struct symsrc; +#ifdef HAVE_LIBBFD_SUPPORT +int dso__load_bfd_symbols(struct dso *dso, const char *debugfile); +#endif + int dso__load_sym(struct dso *dso, struct map *map, struct symsrc *syms_ss, struct symsrc *runtime_ss, int kmodule); int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss);