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selftests/bpf: Add __ksym extern selftest

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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
This commit is contained in:
Andrii Nakryiko
2020-06-19 16:16:57 -07:00
committed by Alexei Starovoitov
parent 1c0c7074fe
commit b7ddfab20a
2 changed files with 103 additions and 0 deletions
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32
tools/testing/selftests/bpf/progs/test_ksyms.c Normal file
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@@ -0,0 +1,32 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2019 Facebook */
#include <stdbool.h>
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
__u64 out__bpf_link_fops = -1;
__u64 out__bpf_link_fops1 = -1;
__u64 out__btf_size = -1;
__u64 out__per_cpu_start = -1;
extern const void bpf_link_fops __ksym;
extern const void __start_BTF __ksym;
extern const void __stop_BTF __ksym;
extern const void __per_cpu_start __ksym;
/* non-existing symbol, weak, default to zero */
extern const void bpf_link_fops1 __ksym __weak;
SEC("raw_tp/sys_enter")
int handler(const void *ctx)
{
out__bpf_link_fops = (__u64)&bpf_link_fops;
out__btf_size = (__u64)(&__stop_BTF - &__start_BTF);
out__per_cpu_start = (__u64)&__per_cpu_start;
out__bpf_link_fops1 = (__u64)&bpf_link_fops1;
return 0;
}
char _license[] SEC("license") = "GPL";