LXR linux/tools/testing/selftests/bpf/progs/test_ksyms

   1// SPDX-License-Identifier: GPL-2.0
   2/* Copyright (c) 2020 Google */
   3
   4#include "vmlinux.h"
   5
   6#include <bpf/bpf_helpers.h>
   7
   8__u64 out__runqueues_addr = -1;
   9__u64 out__bpf_prog_active_addr = -1;
  10
  11__u32 out__rq_cpu = -1; /* percpu struct fields */
  12int out__bpf_prog_active = -1; /* percpu int */
  13
  14__u32 out__this_rq_cpu = -1;
  15int out__this_bpf_prog_active = -1;
  16
  17__u32 out__cpu_0_rq_cpu = -1; /* cpu_rq(0)->cpu */
  18
  19extern const struct rq runqueues __ksym; /* struct type global var. */
  20extern const int bpf_prog_active __ksym; /* int type global var. */
  21
  22SEC("raw_tp/sys_enter")
  23int handler(const void *ctx)
  24{
  25        struct rq *rq;
  26        int *active;
  27        __u32 cpu;
  28
  29        out__runqueues_addr = (__u64)&runqueues;
  30        out__bpf_prog_active_addr = (__u64)&bpf_prog_active;
  31
  32        cpu = bpf_get_smp_processor_id();
  33
  34        /* test bpf_per_cpu_ptr() */
  35        rq = (struct rq *)bpf_per_cpu_ptr(&runqueues, cpu);
  36        if (rq)
  37                out__rq_cpu = rq->cpu;
  38        active = (int *)bpf_per_cpu_ptr(&bpf_prog_active, cpu);
  39        if (active)
  40                out__bpf_prog_active = *active;
  41
  42        rq = (struct rq *)bpf_per_cpu_ptr(&runqueues, 0);
  43        if (rq) /* should always be valid, but we can't spare the check. */
  44                out__cpu_0_rq_cpu = rq->cpu;
  45
  46        /* test bpf_this_cpu_ptr */
  47        rq = (struct rq *)bpf_this_cpu_ptr(&runqueues);
  48        out__this_rq_cpu = rq->cpu;
  49        active = (int *)bpf_this_cpu_ptr(&bpf_prog_active);
  50        out__this_bpf_prog_active = *active;
  51
  52        return 0;
  53}
  54
  55char _license[] SEC("license") = "GPL";
  56