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1// SPDX-License-Identifier: GPL-2.02/* 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