Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2019 Facebook
 
#include <stddef.h>
#include <linux/ptrace.h>
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
 
int valid = 0;
int required_size_out = 0;
int written_stack_out = 0;
int written_global_out = 0;
 
struct {
<------>__u64 _a;
<------>__u64 _b;
<------>__u64 _c;
} fpbe[30] = {0};
 
SEC("perf_event")
int perf_branches(void *ctx)
{
<------>__u64 entries[4 * 3] = {0};
<------>int required_size, written_stack, written_global;
 
<------>/* write to stack */
<------>written_stack = bpf_read_branch_records(ctx, entries, sizeof(entries), 0);
<------>/* ignore spurious events */
<------>if (!written_stack)
<------><------>return 1;
 
<------>/* get required size */
<------>required_size = bpf_read_branch_records(ctx, NULL, 0,
<------><------><------><------><------><------>BPF_F_GET_BRANCH_RECORDS_SIZE);
 
<------>written_global = bpf_read_branch_records(ctx, fpbe, sizeof(fpbe), 0);
<------>/* ignore spurious events */
<------>if (!written_global)
<------><------>return 1;
 
<------>required_size_out = required_size;
<------>written_stack_out = written_stack;
<------>written_global_out = written_global;
<------>valid = 1;
 
<------>return 0;
}
 
char _license[] SEC("license") = "GPL";