From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752242AbeEVK5G (ORCPT ); Tue, 22 May 2018 06:57:06 -0400 Received: from mga17.intel.com ([192.55.52.151]:56463 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751257AbeEVK5E (ORCPT ); Tue, 22 May 2018 06:57:04 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,429,1520924400"; d="scan'208";a="60711624" From: Adrian Hunter To: Thomas Gleixner , Arnaldo Carvalho de Melo Cc: Ingo Molnar , Peter Zijlstra , Andy Lutomirski , "H. Peter Anvin" , Andi Kleen , Alexander Shishkin , Dave Hansen , Joerg Roedel , Jiri Olsa , linux-kernel@vger.kernel.org, x86@kernel.org Subject: [PATCH V3 16/17] perf buildid-cache: kcore_copy: Copy x86 PTI entry trampoline sections Date: Tue, 22 May 2018 13:54:44 +0300 Message-Id: <1526986485-6562-17-git-send-email-adrian.hunter@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1526986485-6562-1-git-send-email-adrian.hunter@intel.com> References: <1526986485-6562-1-git-send-email-adrian.hunter@intel.com> Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki, Business Identity Code: 0357606 - 4, Domiciled in Helsinki Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Identify and copy any sections for x86 PTI entry trampolines. Signed-off-by: Adrian Hunter --- tools/perf/util/symbol-elf.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c index 37d9324c277c..584966913aeb 100644 --- a/tools/perf/util/symbol-elf.c +++ b/tools/perf/util/symbol-elf.c @@ -1392,6 +1392,11 @@ struct phdr_data { struct list_head node; }; +struct sym_data { + u64 addr; + struct list_head node; +}; + struct kcore_copy_info { u64 stext; u64 etext; @@ -1401,6 +1406,7 @@ struct kcore_copy_info { u64 last_module_symbol; size_t phnum; struct list_head phdrs; + struct list_head syms; }; #define kcore_copy__for_each_phdr(k, p) \ @@ -1441,6 +1447,29 @@ static void kcore_copy__free_phdrs(struct kcore_copy_info *kci) } } +static struct sym_data *kcore_copy__new_sym(struct kcore_copy_info *kci, + u64 addr) +{ + struct sym_data *s = zalloc(sizeof(*s)); + + if (s) { + s->addr = addr; + list_add_tail(&s->node, &kci->syms); + } + + return s; +} + +static void kcore_copy__free_syms(struct kcore_copy_info *kci) +{ + struct sym_data *s, *tmp; + + list_for_each_entry_safe(s, tmp, &kci->syms, node) { + list_del(&s->node); + free(s); + } +} + static int kcore_copy__process_kallsyms(void *arg, const char *name, char type, u64 start) { @@ -1471,6 +1500,9 @@ static int kcore_copy__process_kallsyms(void *arg, const char *name, char type, return 0; } + if (is_entry_trampoline(name) && !kcore_copy__new_sym(kci, start)) + return -1; + return 0; } @@ -1538,6 +1570,7 @@ static int kcore_copy__read_map(u64 start, u64 len, u64 pgoff, void *data) { struct kcore_copy_info *kci = data; u64 end = start + len; + struct sym_data *sdat; if (kcore_copy__map(kci, start, end, pgoff, kci->stext, kci->etext)) return -1; @@ -1546,6 +1579,13 @@ static int kcore_copy__read_map(u64 start, u64 len, u64 pgoff, void *data) kci->last_module_symbol)) return -1; + list_for_each_entry(sdat, &kci->syms, node) { + u64 s = round_down(sdat->addr, page_size); + + if (kcore_copy__map(kci, start, end, pgoff, s, s + len)) + return -1; + } + return 0; } @@ -1740,6 +1780,7 @@ int kcore_copy(const char *from_dir, const char *to_dir) struct phdr_data *p; INIT_LIST_HEAD(&kci.phdrs); + INIT_LIST_HEAD(&kci.syms); if (kcore_copy__copy_file(from_dir, to_dir, "kallsyms")) return -1; @@ -1806,6 +1847,7 @@ int kcore_copy(const char *from_dir, const char *to_dir) kcore_copy__unlink(to_dir, "kallsyms"); kcore_copy__free_phdrs(&kci); + kcore_copy__free_syms(&kci); return err; } -- 1.9.1