1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2026 Meta Platforms, Inc. and affiliates. */ 3 4 #include <vmlinux.h> 5 #include <bpf/bpf_helpers.h> 6 #include "bpf_misc.h" 7 8 extern int bpf_kfunc_implicit_arg(int a) __weak __ksym; 9 extern int bpf_kfunc_implicit_arg_impl(int a, struct bpf_prog_aux *aux) __weak __ksym; /* illegal */ 10 extern int bpf_kfunc_implicit_arg_legacy(int a, int b) __weak __ksym; 11 extern int bpf_kfunc_implicit_arg_legacy_impl(int a, int b, struct bpf_prog_aux *aux) __weak __ksym; 12 13 char _license[] SEC("license") = "GPL"; 14 15 SEC("syscall") 16 __retval(5) 17 int test_kfunc_implicit_arg(void *ctx) 18 { 19 return bpf_kfunc_implicit_arg(5); 20 } 21 22 SEC("syscall") 23 __failure __msg("cannot find address for kernel function bpf_kfunc_implicit_arg_impl") 24 int test_kfunc_implicit_arg_impl_illegal(void *ctx) 25 { 26 return bpf_kfunc_implicit_arg_impl(5, NULL); 27 } 28 29 SEC("syscall") 30 __retval(7) 31 int test_kfunc_implicit_arg_legacy(void *ctx) 32 { 33 return bpf_kfunc_implicit_arg_legacy(3, 4); 34 } 35 36 SEC("syscall") 37 __retval(11) 38 int test_kfunc_implicit_arg_legacy_impl(void *ctx) 39 { 40 return bpf_kfunc_implicit_arg_legacy_impl(5, 6, NULL); 41 } 42