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// 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;
}
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