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