| // SPDX-License-Identifier: GPL-2.0 |
| // Copyright (c) 2019 Facebook |
| |
| #include <linux/bpf.h> |
| #include <stdint.h> |
| #include <bpf/bpf_helpers.h> |
| #include <bpf/bpf_core_read.h> |
| |
| char _license[] SEC("license") = "GPL"; |
| |
| struct { |
| char in[256]; |
| char out[256]; |
| } data = {}; |
| |
| struct core_reloc_existence_output { |
| int a_exists; |
| int a_value; |
| int b_exists; |
| int b_value; |
| int c_exists; |
| int c_value; |
| int arr_exists; |
| int arr_value; |
| int s_exists; |
| int s_value; |
| }; |
| |
| struct core_reloc_existence { |
| struct { |
| int x; |
| } s; |
| int arr[1]; |
| int a; |
| struct { |
| int b; |
| }; |
| int c; |
| }; |
| |
| SEC("raw_tracepoint/sys_enter") |
| int test_core_existence(void *ctx) |
| { |
| struct core_reloc_existence *in = (void *)&data.in; |
| struct core_reloc_existence_output *out = (void *)&data.out; |
| |
| out->a_exists = bpf_core_field_exists(in->a); |
| if (bpf_core_field_exists(in->a)) |
| out->a_value = BPF_CORE_READ(in, a); |
| else |
| out->a_value = 0xff000001u; |
| |
| out->b_exists = bpf_core_field_exists(in->b); |
| if (bpf_core_field_exists(in->b)) |
| out->b_value = BPF_CORE_READ(in, b); |
| else |
| out->b_value = 0xff000002u; |
| |
| out->c_exists = bpf_core_field_exists(in->c); |
| if (bpf_core_field_exists(in->c)) |
| out->c_value = BPF_CORE_READ(in, c); |
| else |
| out->c_value = 0xff000003u; |
| |
| out->arr_exists = bpf_core_field_exists(in->arr); |
| if (bpf_core_field_exists(in->arr)) |
| out->arr_value = BPF_CORE_READ(in, arr[0]); |
| else |
| out->arr_value = 0xff000004u; |
| |
| out->s_exists = bpf_core_field_exists(in->s); |
| if (bpf_core_field_exists(in->s)) |
| out->s_value = BPF_CORE_READ(in, s.x); |
| else |
| out->s_value = 0xff000005u; |
| |
| return 0; |
| } |
| |