[bpf-next,4/7] tools/bpf: add ksym_get_addr() in trace_helpers

Message ID 20180515234521.856763-5-yhs@fb.com
State Changes Requested
Delegated to: BPF Maintainers
Headers show
Series
  • bpf: implement BPF_PERF_EVENT_QUERY for perf event query
Related show

Commit Message

Yonghong Song May 15, 2018, 11:45 p.m.
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 <yhs@fb.com>
---
 tools/testing/selftests/bpf/trace_helpers.c | 12 ++++++++++++
 tools/testing/selftests/bpf/trace_helpers.h |  1 +
 2 files changed, 13 insertions(+)

Patch

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);