1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
3
4#include "vmlinux.h"
5#include <bpf/bpf_helpers.h>
6#include <bpf/usdt.bpf.h>
7
8int my_pid;
9
10int usdt0_called;
11u64 usdt0_cookie;
12int usdt0_arg_cnt;
13int usdt0_arg_ret;
14
15SEC("usdt")
16int usdt0(struct pt_regs *ctx)
17{
18 long tmp;
19
20 if (my_pid != (bpf_get_current_pid_tgid() >> 32))
21 return 0;
22
23 __sync_fetch_and_add(&usdt0_called, 1);
24
25 usdt0_cookie = bpf_usdt_cookie(ctx);
26 usdt0_arg_cnt = bpf_usdt_arg_cnt(ctx);
27 /* should return -ENOENT for any arg_num */
28 usdt0_arg_ret = bpf_usdt_arg(ctx, bpf_get_prandom_u32(), &tmp);
29 return 0;
30}
31
32int usdt3_called;
33u64 usdt3_cookie;
34int usdt3_arg_cnt;
35int usdt3_arg_rets[3];
36u64 usdt3_args[3];
37
38SEC("usdt//proc/self/exe:test:usdt3")
39int usdt3(struct pt_regs *ctx)
40{
41 long tmp;
42
43 if (my_pid != (bpf_get_current_pid_tgid() >> 32))
44 return 0;
45
46 __sync_fetch_and_add(&usdt3_called, 1);
47
48 usdt3_cookie = bpf_usdt_cookie(ctx);
49 usdt3_arg_cnt = bpf_usdt_arg_cnt(ctx);
50
51 usdt3_arg_rets[0] = bpf_usdt_arg(ctx, 0, &tmp);
52 usdt3_args[0] = (int)tmp;
53
54 usdt3_arg_rets[1] = bpf_usdt_arg(ctx, 1, &tmp);
55 usdt3_args[1] = (long)tmp;
56
57 usdt3_arg_rets[2] = bpf_usdt_arg(ctx, 2, &tmp);
58 usdt3_args[2] = (uintptr_t)tmp;
59
60 return 0;
61}
62
63int usdt12_called;
64u64 usdt12_cookie;
65int usdt12_arg_cnt;
66u64 usdt12_args[12];
67
68SEC("usdt//proc/self/exe:test:usdt12")
69int BPF_USDT(usdt12, int a1, int a2, long a3, long a4, unsigned a5,
70 long a6, __u64 a7, uintptr_t a8, int a9, short a10,
71 short a11, signed char a12)
72{
73 if (my_pid != (bpf_get_current_pid_tgid() >> 32))
74 return 0;
75
76 __sync_fetch_and_add(&usdt12_called, 1);
77
78 usdt12_cookie = bpf_usdt_cookie(ctx);
79 usdt12_arg_cnt = bpf_usdt_arg_cnt(ctx);
80
81 usdt12_args[0] = a1;
82 usdt12_args[1] = a2;
83 usdt12_args[2] = a3;
84 usdt12_args[3] = a4;
85 usdt12_args[4] = a5;
86 usdt12_args[5] = a6;
87 usdt12_args[6] = a7;
88 usdt12_args[7] = a8;
89 usdt12_args[8] = a9;
90 usdt12_args[9] = a10;
91 usdt12_args[10] = a11;
92 usdt12_args[11] = a12;
93 return 0;
94}
95
96char _license[] SEC("license") = "GPL";
97

source code of linux/tools/testing/selftests/bpf/progs/test_usdt.c