1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
3
4 #include <vmlinux.h>
5 #include <bpf/bpf_tracing.h>
6 #include "bpf_misc.h"
7 #include "../bpf_testmod/bpf_testmod.h"
8 #include "../bpf_testmod/bpf_testmod_kfunc.h"
9
10 char _license[] SEC("license") = "GPL";
11
12 static __noinline __used int subprog(struct st_ops_args *args)
13 {
14 args->a += 1;
15 return args->a;
16 }
17
18 SEC("struct_ops/test_epilogue_subprog")
19 int BPF_PROG(test_epilogue_subprog, struct st_ops_args *args)
20 {
21 subprog(args);
22 return args->a;
23 }
24
25 struct {
26 __uint(type, BPF_MAP_TYPE_PROG_ARRAY);
27 __uint(max_entries, 1);
28 __uint(key_size, sizeof(__u32));
29 __uint(value_size, sizeof(__u32));
30 __array(values, void (void));
31 } epilogue_map SEC(".maps") = {
32 .values = {
33 [0] = (void *)&test_epilogue_subprog,
34 }
35 };
36
37 SEC("struct_ops/test_epilogue_tailcall")
38 int test_epilogue_tailcall(unsigned long long *ctx)
39 {
40 bpf_tail_call(ctx, &epilogue_map, 0);
41 return 0;
42 }
43
44 SEC(".struct_ops.link")
45 struct bpf_testmod_st_ops epilogue_tailcall = {
46 .test_epilogue = (void *)test_epilogue_tailcall,
47 };
48
49 SEC(".struct_ops.link")
50 struct bpf_testmod_st_ops epilogue_subprog = {
51 .test_epilogue = (void *)test_epilogue_subprog,
52 };
53
54 SEC("syscall")
55 int syscall_epilogue_tailcall(struct st_ops_args *args)
56 {
57 return bpf_kfunc_st_ops_test_epilogue(args);
58 }
59
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.