[PATCH bpf-next v2 4/5] selftest/bpf: move utility function to tests header

[Andrei Matei <andreimatei1@gmail.com>]

get_base_addr is generally useful for tests attaching uprobes. This
patch moves it from one particular test to test_progs.{h,c}. The
function will be used by a second test in the next patch.

Signed-off-by: Andrei Matei <andreimatei1@gmail.com>
---
 .../selftests/bpf/prog_tests/attach_probe.c   | 21 ----------------
 tools/testing/selftests/bpf/test_progs.c      | 25 +++++++++++++++++++
 tools/testing/selftests/bpf/test_progs.h      |  1 +
 3 files changed, 26 insertions(+), 21 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/attach_probe.c b/tools/testing/selftests/bpf/prog_tests/attach_probe.c
index a0ee87c8e1ea..3bda8acbbafb 100644
--- a/tools/testing/selftests/bpf/prog_tests/attach_probe.c
+++ b/tools/testing/selftests/bpf/prog_tests/attach_probe.c
@@ -2,27 +2,6 @@
 #include <test_progs.h>
 #include "test_attach_probe.skel.h"
 
-ssize_t get_base_addr() {
-	size_t start, offset;
-	char buf[256];
-	FILE *f;
-
-	f = fopen("/proc/self/maps", "r");
-	if (!f)
-		return -errno;
-
-	while (fscanf(f, "%zx-%*x %s %zx %*[^\n]\n",
-		      &start, buf, &offset) == 3) {
-		if (strcmp(buf, "r-xp") == 0) {
-			fclose(f);
-			return start - offset;
-		}
-	}
-
-	fclose(f);
-	return -EINVAL;
-}
-
 void test_attach_probe(void)
 {
 	int duration = 0;
diff --git a/tools/testing/selftests/bpf/test_progs.c b/tools/testing/selftests/bpf/test_progs.c
index 213628ee721c..6d3354ae4034 100644
--- a/tools/testing/selftests/bpf/test_progs.c
+++ b/tools/testing/selftests/bpf/test_progs.c
@@ -423,6 +423,31 @@ static int load_bpf_testmod(void)
 	return 0;
 }
 
+/* find the address at which the executable section of the current program has
+ * been loaded.
+ */
+ssize_t get_base_addr(void)
+{
+	size_t start, offset;
+	char buf[256];
+	FILE *f;
+
+	f = fopen("/proc/self/maps", "r");
+	if (!f)
+		return -errno;
+
+	while (fscanf(f, "%zx-%*x %s %zx %*[^\n]\n",
+		      &start, buf, &offset) == 3) {
+		if (strcmp(buf, "r-xp") == 0) {
+			fclose(f);
+			return start - offset;
+		}
+	}
+
+	fclose(f);
+	return -EINVAL;
+}
+
 /* extern declarations for test funcs */
 #define DEFINE_TEST(name) extern void test_##name(void);
 #include <prog_tests/tests.h>
diff --git a/tools/testing/selftests/bpf/test_progs.h b/tools/testing/selftests/bpf/test_progs.h
index f7c2fd89d01a..7a1eafd7ae77 100644
--- a/tools/testing/selftests/bpf/test_progs.h
+++ b/tools/testing/selftests/bpf/test_progs.h
@@ -219,6 +219,7 @@ int compare_map_keys(int map1_fd, int map2_fd);
 int compare_stack_ips(int smap_fd, int amap_fd, int stack_trace_len);
 int extract_build_id(char *build_id, size_t size);
 int kern_sync_rcu(void);
+ssize_t get_base_addr(void);
 
 #ifdef __x86_64__
 #define SYS_NANOSLEEP_KPROBE_NAME "__x64_sys_nanosleep"
-- 
2.27.0