1#include <linux/ptrace.h>
 2#include <linux/version.h>
 3#include <uapi/linux/bpf.h>
 4#include "bpf_helpers.h"
 5
 6struct bpf_map_def SEC("maps") counters = {
 7	.type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
 8	.key_size = sizeof(int),
 9	.value_size = sizeof(u32),
10	.max_entries = 64,
11};
12struct bpf_map_def SEC("maps") values = {
13	.type = BPF_MAP_TYPE_HASH,
14	.key_size = sizeof(int),
15	.value_size = sizeof(u64),
16	.max_entries = 64,
17};
18struct bpf_map_def SEC("maps") values2 = {
19	.type = BPF_MAP_TYPE_HASH,
20	.key_size = sizeof(int),
21	.value_size = sizeof(struct bpf_perf_event_value),
22	.max_entries = 64,
23};
24
25SEC("kprobe/htab_map_get_next_key")
26int bpf_prog1(struct pt_regs *ctx)
27{
28	u32 key = bpf_get_smp_processor_id();
29	u64 count, *val;
30	s64 error;
31
32	count = bpf_perf_event_read(&counters, key);
33	error = (s64)count;
34	if (error <= -2 && error >= -22)
35		return 0;
36
37	val = bpf_map_lookup_elem(&values, &key);
38	if (val)
39		*val = count;
40	else
41		bpf_map_update_elem(&values, &key, &count, BPF_NOEXIST);
42
43	return 0;
44}
45
46SEC("kprobe/htab_map_lookup_elem")
47int bpf_prog2(struct pt_regs *ctx)
48{
49	u32 key = bpf_get_smp_processor_id();
50	struct bpf_perf_event_value *val, buf;
51	int error;
52
53	error = bpf_perf_event_read_value(&counters, key, &buf, sizeof(buf));
54	if (error)
55		return 0;
56
57	val = bpf_map_lookup_elem(&values2, &key);
58	if (val)
59		*val = buf;
60	else
61		bpf_map_update_elem(&values2, &key, &buf, BPF_NOEXIST);
62
63	return 0;
64}
65
66char _license[] SEC("license") = "GPL";
67u32 _version SEC("version") = LINUX_VERSION_CODE;