1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* Copyright (c) 2021 Facebook */ |
3 | |
4 | #include "vmlinux.h" |
5 | #include <bpf/bpf_helpers.h> |
6 | |
7 | #define X_0(x) |
8 | #define X_1(x) x X_0(x) |
9 | #define X_2(x) x X_1(x) |
10 | #define X_3(x) x X_2(x) |
11 | #define X_4(x) x X_3(x) |
12 | #define X_5(x) x X_4(x) |
13 | #define X_6(x) x X_5(x) |
14 | #define X_7(x) x X_6(x) |
15 | #define X_8(x) x X_7(x) |
16 | #define X_9(x) x X_8(x) |
17 | #define X_10(x) x X_9(x) |
18 | #define REPEAT_256(Y) X_2(X_10(X_10(Y))) X_5(X_10(Y)) X_6(Y) |
19 | |
20 | extern const int bpf_testmod_ksym_percpu __ksym; |
21 | extern void bpf_testmod_test_mod_kfunc(int i) __ksym; |
22 | extern void bpf_testmod_invalid_mod_kfunc(void) __ksym __weak; |
23 | |
24 | int out_bpf_testmod_ksym = 0; |
25 | const volatile int x = 0; |
26 | |
27 | SEC("tc" ) |
28 | int load(struct __sk_buff *skb) |
29 | { |
30 | /* This will be kept by clang, but removed by verifier. Since it is |
31 | * marked as __weak, libbpf and gen_loader don't error out if BTF ID |
32 | * is not found for it, instead imm and off is set to 0 for it. |
33 | */ |
34 | if (x) |
35 | bpf_testmod_invalid_mod_kfunc(); |
36 | bpf_testmod_test_mod_kfunc(42); |
37 | out_bpf_testmod_ksym = *(int *)bpf_this_cpu_ptr(&bpf_testmod_ksym_percpu); |
38 | return 0; |
39 | } |
40 | |
41 | SEC("tc" ) |
42 | int load_256(struct __sk_buff *skb) |
43 | { |
44 | /* this will fail if kfunc doesn't reuse its own btf fd index */ |
45 | REPEAT_256(bpf_testmod_test_mod_kfunc(42);); |
46 | bpf_testmod_test_mod_kfunc(42); |
47 | return 0; |
48 | } |
49 | |
50 | char LICENSE[] SEC("license" ) = "GPL" ; |
51 | |