netdev - [PATCH bpf-next v5 4/7] tools/bpf: add ksym_get_addr() in trace

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Message-ID: <20180524182111.454612-5-yhs@fb.com>
Date:   Thu, 24 May 2018 11:21:11 -0700
From:   Yonghong Song <yhs@...com>
To:     <peterz@...radead.org>, <ast@...com>, <daniel@...earbox.net>,
        <netdev@...r.kernel.org>
CC:     <kernel-team@...com>
Subject: [PATCH bpf-next v5 4/7] tools/bpf: add ksym_get_addr() in trace_helpers

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.

Acked-by: Martin KaFai Lau <kafai@...com>
Signed-off-by: Yonghong Song <yhs@...com>
---
 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