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-rw-r--r--tools/testing/selftests/bpf/progs/test_mmap.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_mmap.c b/tools/testing/selftests/bpf/progs/test_mmap.c
new file mode 100644
index 000000000000..0d2ec9fbcf61
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/test_mmap.c
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2019 Facebook
+
+#include <linux/bpf.h>
+#include <stdint.h>
+#include "bpf_helpers.h"
+
+char _license[] SEC("license") = "GPL";
+
+struct {
+ __uint(type, BPF_MAP_TYPE_ARRAY);
+ __uint(max_entries, 512 * 4); /* at least 4 pages of data */
+ __uint(map_flags, BPF_F_MMAPABLE);
+ __type(key, __u32);
+ __type(value, __u64);
+} data_map SEC(".maps");
+
+static volatile __u64 in_val;
+static volatile __u64 out_val;
+
+SEC("raw_tracepoint/sys_enter")
+int test_mmap(void *ctx)
+{
+ int zero = 0, one = 1, two = 2, far = 1500;
+ __u64 val, *p;
+
+ out_val = in_val;
+
+ /* data_map[2] = in_val; */
+ bpf_map_update_elem(&data_map, &two, (const void *)&in_val, 0);
+
+ /* data_map[1] = data_map[0] * 2; */
+ p = bpf_map_lookup_elem(&data_map, &zero);
+ if (p) {
+ val = (*p) * 2;
+ bpf_map_update_elem(&data_map, &one, &val, 0);
+ }
+
+ /* data_map[far] = in_val * 3; */
+ val = in_val * 3;
+ bpf_map_update_elem(&data_map, &far, &val, 0);
+
+ return 0;
+}
+