From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yonghong Song 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> References: <20180515234521.856763-1-yhs@fb.com> Mime-Version: 1.0 Content-Type: text/plain Cc: To: , , , Return-path: 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 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 In-Reply-To: <20180515234521.856763-1-yhs@fb.com> Sender: netdev-owner@vger.kernel.org List-ID: 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); -- 2.9.5