// SPDX-License-Identifier: GPL-2.0 /* * Test weak ksyms. * * Copyright (c) 2021 Google */ #include "vmlinux.h" #include <bpf/bpf_helpers.h> int out__existing_typed = -1; __u64 out__existing_typeless = -1; __u64 out__non_existent_typeless = -1; __u64 out__non_existent_typed = -1; /* existing weak symbols */ /* test existing weak symbols can be resolved. */ extern const struct rq runqueues __ksym __weak; /* typed */ extern const void bpf_prog_active __ksym __weak; /* typeless */ /* non-existent weak symbols. */ /* typeless symbols, default to zero. */ extern const void bpf_link_fops1 __ksym __weak; /* typed symbols, default to zero. */ extern const int bpf_link_fops2 __ksym __weak; SEC("raw_tp/sys_enter") int pass_handler(const void *ctx) { struct rq *rq; /* tests existing symbols. */ rq = (struct rq *)bpf_per_cpu_ptr(&runqueues, 0); if (rq) out__existing_typed = 0; out__existing_typeless = (__u64)&bpf_prog_active; /* tests non-existent symbols. */ out__non_existent_typeless = (__u64)&bpf_link_fops1; /* tests non-existent symbols. */ out__non_existent_typed = (__u64)&bpf_link_fops2; if (&bpf_link_fops2) /* can't happen */ out__non_existent_typed = (__u64)bpf_per_cpu_ptr(&bpf_link_fops2, 0); return 0; } char _license[] SEC("license") = "GPL";