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// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2021 Facebook */
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
char _license[] SEC("license") = "GPL";
__u64 test1_hits = 0;
__u64 address_low = 0;
__u64 address_high = 0;
int wasted_entries = 0;
long total_entries = 0;
#define ENTRY_CNT 32
struct perf_branch_entry entries[ENTRY_CNT] = {};
static inline bool in_range(__u64 val)
{
return (val >= address_low) && (val < address_high);
}
SEC("fexit/bpf_testmod_loop_test")
int BPF_PROG(test1, int n, int ret)
{
long i;
total_entries = bpf_get_branch_snapshot(entries, sizeof(entries), 0);
total_entries /= sizeof(struct perf_branch_entry);
for (i = 0; i < ENTRY_CNT; i++) {
if (i >= total_entries)
break;
if (in_range(entries[i].from) && in_range(entries[i].to))
test1_hits++;
else if (!test1_hits)
wasted_entries++;
}
return 0;
}
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