1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2020 Google */
3
4#include "vmlinux.h"
5
6#include <bpf/bpf_helpers.h>
7
8__u64 out__runqueues_addr = -1;
9__u64 out__bpf_prog_active_addr = -1;
10
11__u32 out__rq_cpu = -1; /* percpu struct fields */
12int out__bpf_prog_active = -1; /* percpu int */
13
14__u32 out__this_rq_cpu = -1;
15int out__this_bpf_prog_active = -1;
16
17__u32 out__cpu_0_rq_cpu = -1; /* cpu_rq(0)->cpu */
18
19extern const struct rq runqueues __ksym; /* struct type global var. */
20extern const int bpf_prog_active __ksym; /* int type global var. */
21
22SEC("raw_tp/sys_enter")
23int handler(const void *ctx)
24{
25	struct rq *rq;
26	int *active;
27	__u32 cpu;
28
29	out__runqueues_addr = (__u64)&runqueues;
30	out__bpf_prog_active_addr = (__u64)&bpf_prog_active;
31
32	cpu = bpf_get_smp_processor_id();
33
34	/* test bpf_per_cpu_ptr() */
35	rq = (struct rq *)bpf_per_cpu_ptr(&runqueues, cpu);
36	if (rq)
37		out__rq_cpu = rq->cpu;
38	active = (int *)bpf_per_cpu_ptr(&bpf_prog_active, cpu);
39	if (active)
40		out__bpf_prog_active = *active;
41
42	rq = (struct rq *)bpf_per_cpu_ptr(&runqueues, 0);
43	if (rq) /* should always be valid, but we can't spare the check. */
44		out__cpu_0_rq_cpu = rq->cpu;
45
46	/* test bpf_this_cpu_ptr */
47	rq = (struct rq *)bpf_this_cpu_ptr(&runqueues);
48	out__this_rq_cpu = rq->cpu;
49	active = (int *)bpf_this_cpu_ptr(&bpf_prog_active);
50	out__this_bpf_prog_active = *active;
51
52	return 0;
53}
54
55char _license[] SEC("license") = "GPL";
56