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b7ddfab20a
Validate libbpf is able to handle weak and strong kernel symbol externs in BPF code correctly. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Reviewed-by: Hao Luo <haoluo@google.com> Link: https://lore.kernel.org/bpf/20200619231703.738941-4-andriin@fb.com
32 lines
825 B
C
32 lines
825 B
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2019 Facebook */
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#include <stdbool.h>
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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__u64 out__bpf_link_fops = -1;
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__u64 out__bpf_link_fops1 = -1;
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__u64 out__btf_size = -1;
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__u64 out__per_cpu_start = -1;
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extern const void bpf_link_fops __ksym;
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extern const void __start_BTF __ksym;
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extern const void __stop_BTF __ksym;
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extern const void __per_cpu_start __ksym;
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/* non-existing symbol, weak, default to zero */
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extern const void bpf_link_fops1 __ksym __weak;
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SEC("raw_tp/sys_enter")
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int handler(const void *ctx)
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{
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out__bpf_link_fops = (__u64)&bpf_link_fops;
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out__btf_size = (__u64)(&__stop_BTF - &__start_BTF);
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out__per_cpu_start = (__u64)&__per_cpu_start;
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out__bpf_link_fops1 = (__u64)&bpf_link_fops1;
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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