// SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2020 Google */ #include "vmlinux.h" #include <bpf/bpf_helpers.h> __u64 out__runqueues_addr = -1; __u64 out__bpf_prog_active_addr = -1; __u32 out__rq_cpu = -1; /* percpu struct fields */ int out__bpf_prog_active = -1; /* percpu int */ __u32 out__this_rq_cpu = -1; int out__this_bpf_prog_active = -1; __u32 out__cpu_0_rq_cpu = -1; /* cpu_rq(0)->cpu */ extern const struct rq runqueues __ksym; /* struct type global var. */ extern const int bpf_prog_active __ksym; /* int type global var. */ SEC("raw_tp/sys_enter") int handler(const void *ctx) { struct rq *rq; int *active; __u32 cpu; out__runqueues_addr = (__u64)&runqueues; out__bpf_prog_active_addr = (__u64)&bpf_prog_active; cpu = bpf_get_smp_processor_id(); /* test bpf_per_cpu_ptr() */ rq = (struct rq *)bpf_per_cpu_ptr(&runqueues, cpu); if (rq) out__rq_cpu = rq->cpu; active = (int *)bpf_per_cpu_ptr(&bpf_prog_active, cpu); if (active) out__bpf_prog_active = *active; rq = (struct rq *)bpf_per_cpu_ptr(&runqueues, 0); if (rq) /* should always be valid, but we can't spare the check. */ out__cpu_0_rq_cpu = rq->cpu; /* test bpf_this_cpu_ptr */ rq = (struct rq *)bpf_this_cpu_ptr(&runqueues); out__this_rq_cpu = rq->cpu; active = (int *)bpf_this_cpu_ptr(&bpf_prog_active); out__this_bpf_prog_active = *active; return 0; } char _license[] SEC("license") = "GPL";