From patchwork Tue May 15 23:45:18 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yonghong Song X-Patchwork-Id: 914029 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=fb.com Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=fb.com header.i=@fb.com header.b="q9+H+fl1"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 40lvMN3khrz9s0y for ; Wed, 16 May 2018 09:45:36 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752535AbeEOXpe (ORCPT ); Tue, 15 May 2018 19:45:34 -0400 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:37434 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752382AbeEOXpc (ORCPT ); Tue, 15 May 2018 19:45:32 -0400 Received: from pps.filterd (m0148461.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w4FNhFvW030701 for ; Tue, 15 May 2018 16:45:32 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fb.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=facebook; bh=eGOgMX3bPNd6xcGR/DeGGpi21EDOLF/ts/E5fd62s04=; b=q9+H+fl1cygdgACuWAk8bYHAGvBJBJlQ3RRLzjL9eluUY17Che243fsFLcA0UaDO+cH3 LlMPMJ1LYsNaYJO0uVLU5YVTq53Rw+zUbHOfMhsLqn/FDviv5yrxRONLqDXujSUjzJsW q3NXW0g6ZXmRJ8AiYs0lH3GSvICo1QX9pOA= Received: from mail.thefacebook.com ([199.201.64.23]) by mx0a-00082601.pphosted.com with ESMTP id 2j082ug6st-1 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT) for ; Tue, 15 May 2018 16:45:32 -0700 Received: from mx-out.facebook.com (192.168.52.123) by PRN-CHUB08.TheFacebook.com (192.168.16.18) with Microsoft SMTP Server id 14.3.361.1; Tue, 15 May 2018 16:45:31 -0700 Received: by devbig003.ftw2.facebook.com (Postfix, from userid 128203) id 6C0EF370160F; Tue, 15 May 2018 16:45:22 -0700 (PDT) Smtp-Origin-Hostprefix: devbig From: Yonghong Song Smtp-Origin-Hostname: devbig003.ftw2.facebook.com To: , , , CC: Smtp-Origin-Cluster: ftw2c04 Subject: [PATCH bpf-next 4/7] tools/bpf: add ksym_get_addr() in trace_helpers Date: Tue, 15 May 2018 16:45:18 -0700 Message-ID: <20180515234521.856763-5-yhs@fb.com> X-Mailer: git-send-email 2.9.5 In-Reply-To: <20180515234521.856763-1-yhs@fb.com> References: <20180515234521.856763-1-yhs@fb.com> X-FB-Internal: Safe MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2018-05-15_09:, , signatures=0 X-Proofpoint-Spam-Reason: safe X-FB-Internal: Safe Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Given a kernel function name, ksym_get_addr() will return the kernel address for this function, or 0 if it cannot find this function name in /proc/kallsyms. This function will be used later when a kernel address is used to initiate a kprobe perf event. Signed-off-by: Yonghong Song --- tools/testing/selftests/bpf/trace_helpers.c | 12 ++++++++++++ tools/testing/selftests/bpf/trace_helpers.h | 1 + 2 files changed, 13 insertions(+) diff --git a/tools/testing/selftests/bpf/trace_helpers.c b/tools/testing/selftests/bpf/trace_helpers.c index 8fb4fe8..3868dcb 100644 --- a/tools/testing/selftests/bpf/trace_helpers.c +++ b/tools/testing/selftests/bpf/trace_helpers.c @@ -72,6 +72,18 @@ struct ksym *ksym_search(long key) return &syms[0]; } +long ksym_get_addr(const char *name) +{ + int i; + + for (i = 0; i < sym_cnt; i++) { + if (strcmp(syms[i].name, name) == 0) + return syms[i].addr; + } + + return 0; +} + static int page_size; static int page_cnt = 8; static struct perf_event_mmap_page *header; diff --git a/tools/testing/selftests/bpf/trace_helpers.h b/tools/testing/selftests/bpf/trace_helpers.h index 36d90e3..3b4bcf7 100644 --- a/tools/testing/selftests/bpf/trace_helpers.h +++ b/tools/testing/selftests/bpf/trace_helpers.h @@ -11,6 +11,7 @@ struct ksym { int load_kallsyms(void); struct ksym *ksym_search(long key); +long ksym_get_addr(const char *name); typedef enum bpf_perf_event_ret (*perf_event_print_fn)(void *data, int size);