// 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 __start_BTF[];
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extern char __weak __stop_BTF[];
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static ssize_t
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btf_vmlinux_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, __start_BTF + off, len);
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return len;
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}
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static struct bin_attribute bin_attr_btf_vmlinux __ro_after_init = {
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.attr = { .name = "vmlinux", .mode = 0444, },
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.read = btf_vmlinux_read,
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};
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static struct kobject *btf_kobj;
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static int __init btf_vmlinux_init(void)
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{
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bin_attr_btf_vmlinux.size = __stop_BTF - __start_BTF;
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if (!__start_BTF || bin_attr_btf_vmlinux.size == 0)
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return 0;
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btf_kobj = kobject_create_and_add("btf", kernel_kobj);
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if (!btf_kobj)
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return -ENOMEM;
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return sysfs_create_bin_file(btf_kobj, &bin_attr_btf_vmlinux);
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}
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subsys_initcall(btf_vmlinux_init);
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