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