From fb6d59423115b10125f5db6acb8471f6f0af4ad7 Mon Sep 17 00:00:00 2001 From: "Naveen N. Rao" Date: Tue, 28 Apr 2015 17:35:36 +0530 Subject: [PATCH] perf probe ppc: Use the right prefix when ignoring SyS symbols on ppc Use the proper prefix when ignoring SyS symbols on ppc ABIv1. While at it, generalize symbol selection so architectures can implement their own logic. Signed-off-by: Naveen N. Rao Reviewed-by: Srikar Dronamraju Cc: Ananth N Mavinakayanahalli Cc: Masami Hiramatsu Cc: Michael Ellerman Cc: Sukadev Bhattiprolu Cc: linuxppc-dev@lists.ozlabs.org Link: http://lkml.kernel.org/r/adf1f98b121ecaf292777fe5cc69fe1038feabce.1430217967.git.naveen.n.rao@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/arch/powerpc/util/sym-handling.c | 20 ++++++++++++++++++++ tools/perf/util/symbol.c | 21 ++++++++++++--------- tools/perf/util/symbol.h | 5 +++++ 3 files changed, 37 insertions(+), 9 deletions(-) diff --git a/tools/perf/arch/powerpc/util/sym-handling.c b/tools/perf/arch/powerpc/util/sym-handling.c index c9de0012195f..5522a4000c22 100644 --- a/tools/perf/arch/powerpc/util/sym-handling.c +++ b/tools/perf/arch/powerpc/util/sym-handling.c @@ -17,3 +17,23 @@ bool elf__needs_adjust_symbols(GElf_Ehdr ehdr) ehdr.e_type == ET_DYN; } #endif + +#if !defined(_CALL_ELF) || _CALL_ELF != 2 +int arch__choose_best_symbol(struct symbol *syma, + struct symbol *symb __maybe_unused) +{ + char *sym = syma->name; + + /* Skip over any initial dot */ + if (*sym == '.') + sym++; + + /* Avoid "SyS" kernel syscall aliases */ + if (strlen(sym) >= 3 && !strncmp(sym, "SyS", 3)) + return SYMBOL_B; + if (strlen(sym) >= 10 && !strncmp(sym, "compat_SyS", 10)) + return SYMBOL_B; + + return SYMBOL_A; +} +#endif diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index 201f6c4ca738..f80575728c64 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -85,8 +85,17 @@ static int prefix_underscores_count(const char *str) return tail - str; } -#define SYMBOL_A 0 -#define SYMBOL_B 1 +int __weak arch__choose_best_symbol(struct symbol *syma, + struct symbol *symb __maybe_unused) +{ + /* Avoid "SyS" kernel syscall aliases */ + if (strlen(syma->name) >= 3 && !strncmp(syma->name, "SyS", 3)) + return SYMBOL_B; + if (strlen(syma->name) >= 10 && !strncmp(syma->name, "compat_SyS", 10)) + return SYMBOL_B; + + return SYMBOL_A; +} static int choose_best_symbol(struct symbol *syma, struct symbol *symb) { @@ -134,13 +143,7 @@ static int choose_best_symbol(struct symbol *syma, struct symbol *symb) else if (na < nb) return SYMBOL_B; - /* Avoid "SyS" kernel syscall aliases */ - if (na >= 3 && !strncmp(syma->name, "SyS", 3)) - return SYMBOL_B; - if (na >= 10 && !strncmp(syma->name, "compat_SyS", 10)) - return SYMBOL_B; - - return SYMBOL_A; + return arch__choose_best_symbol(syma, symb); } void symbols__fixup_duplicate(struct rb_root *symbols) diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h index 8cb0af48ec93..bd50ba0dde63 100644 --- a/tools/perf/util/symbol.h +++ b/tools/perf/util/symbol.h @@ -307,4 +307,9 @@ int setup_intlist(struct intlist **list, const char *list_str, bool elf__needs_adjust_symbols(GElf_Ehdr ehdr); #endif +#define SYMBOL_A 0 +#define SYMBOL_B 1 + +int arch__choose_best_symbol(struct symbol *syma, struct symbol *symb); + #endif /* __PERF_SYMBOL */ -- 2.11.0