52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Provide kernel BTF information for introspection and use by eBPF tools.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/kobject.h>
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#include <linux/init.h>
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#include <linux/sysfs.h>
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/* See scripts/link-vmlinux.sh, gen_btf() func for details */
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extern char __weak _binary__btf_kernel_bin_start[];
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extern char __weak _binary__btf_kernel_bin_end[];
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static ssize_t
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btf_kernel_read(struct file *file, struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buf, loff_t off, size_t len)
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{
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memcpy(buf, _binary__btf_kernel_bin_start + off, len);
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return len;
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}
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static struct bin_attribute bin_attr_btf_kernel __ro_after_init = {
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.attr = { .name = "kernel", .mode = 0444, },
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.read = btf_kernel_read,
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};
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static struct kobject *btf_kobj;
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static int __init btf_kernel_init(void)
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{
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int err;
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if (!_binary__btf_kernel_bin_start)
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return 0;
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btf_kobj = kobject_create_and_add("btf", kernel_kobj);
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if (IS_ERR(btf_kobj)) {
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err = PTR_ERR(btf_kobj);
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btf_kobj = NULL;
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return err;
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}
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bin_attr_btf_kernel.size = _binary__btf_kernel_bin_end -
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_binary__btf_kernel_bin_start;
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return sysfs_create_bin_file(btf_kobj, &bin_attr_btf_kernel);
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}
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subsys_initcall(btf_kernel_init);
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