cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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test_btf_nokv.c (782B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/* Copyright (c) 2018 Facebook */
      3#include <linux/bpf.h>
      4#include <bpf/bpf_helpers.h>
      5
      6struct ipv_counts {
      7	unsigned int v4;
      8	unsigned int v6;
      9};
     10
     11struct {
     12	__uint(type, BPF_MAP_TYPE_ARRAY);
     13	__uint(key_size, sizeof(int));
     14	__uint(value_size, sizeof(struct ipv_counts));
     15	__uint(max_entries, 4);
     16} btf_map SEC(".maps");
     17
     18__attribute__((noinline))
     19int test_long_fname_2(void)
     20{
     21	struct ipv_counts *counts;
     22	int key = 0;
     23
     24	counts = bpf_map_lookup_elem(&btf_map, &key);
     25	if (!counts)
     26		return 0;
     27
     28	counts->v6++;
     29
     30	return 0;
     31}
     32
     33__attribute__((noinline))
     34int test_long_fname_1(void)
     35{
     36	return test_long_fname_2();
     37}
     38
     39SEC("dummy_tracepoint")
     40int _dummy_tracepoint(void *arg)
     41{
     42	return test_long_fname_1();
     43}
     44
     45char _license[] SEC("license") = "GPL";