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