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-rw-r--r--tools/testing/selftests/bpf/progs/test_ksyms_btf.c55
1 files changed, 55 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_ksyms_btf.c b/tools/testing/selftests/bpf/progs/test_ksyms_btf.c
new file mode 100644
index 000000000..bb8ea9270
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/test_ksyms_btf.c
@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2020 Google */
+
+#include "vmlinux.h"
+
+#include <bpf/bpf_helpers.h>
+
+__u64 out__runqueues_addr = -1;
+__u64 out__bpf_prog_active_addr = -1;
+
+__u32 out__rq_cpu = -1; /* percpu struct fields */
+int out__bpf_prog_active = -1; /* percpu int */
+
+__u32 out__this_rq_cpu = -1;
+int out__this_bpf_prog_active = -1;
+
+__u32 out__cpu_0_rq_cpu = -1; /* cpu_rq(0)->cpu */
+
+extern const struct rq runqueues __ksym; /* struct type global var. */
+extern const int bpf_prog_active __ksym; /* int type global var. */
+
+SEC("raw_tp/sys_enter")
+int handler(const void *ctx)
+{
+ struct rq *rq;
+ int *active;
+ __u32 cpu;
+
+ out__runqueues_addr = (__u64)&runqueues;
+ out__bpf_prog_active_addr = (__u64)&bpf_prog_active;
+
+ cpu = bpf_get_smp_processor_id();
+
+ /* test bpf_per_cpu_ptr() */
+ rq = (struct rq *)bpf_per_cpu_ptr(&runqueues, cpu);
+ if (rq)
+ out__rq_cpu = rq->cpu;
+ active = (int *)bpf_per_cpu_ptr(&bpf_prog_active, cpu);
+ if (active)
+ out__bpf_prog_active = *active;
+
+ rq = (struct rq *)bpf_per_cpu_ptr(&runqueues, 0);
+ if (rq) /* should always be valid, but we can't spare the check. */
+ out__cpu_0_rq_cpu = rq->cpu;
+
+ /* test bpf_this_cpu_ptr */
+ rq = (struct rq *)bpf_this_cpu_ptr(&runqueues);
+ out__this_rq_cpu = rq->cpu;
+ active = (int *)bpf_this_cpu_ptr(&bpf_prog_active);
+ out__this_bpf_prog_active = *active;
+
+ return 0;
+}
+
+char _license[] SEC("license") = "GPL";