1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Provide kernel BTF information for introspection and use by eBPF tools. 4 */ 5 #include <linux/kernel.h> 6 #include <linux/module.h> 7 #include <linux/kobject.h> 8 #include <linux/init.h> 9 #include <linux/sysfs.h> 10 11 /* See scripts/link-vmlinux.sh, gen_btf() func for details */ 12 extern char __start_BTF[]; 13 extern char __stop_BTF[]; 14 15 static struct bin_attribute bin_attr_btf_vmlinux __ro_after_init = { 16 .attr = { .name = "vmlinux", .mode = 0444, }, 17 .read_new = sysfs_bin_attr_simple_read, 18 }; 19 20 struct kobject *btf_kobj; 21 22 static int __init btf_vmlinux_init(void) 23 { 24 bin_attr_btf_vmlinux.private = __start_BTF; 25 bin_attr_btf_vmlinux.size = __stop_BTF - __start_BTF; 26 27 if (bin_attr_btf_vmlinux.size == 0) 28 return 0; 29 30 btf_kobj = kobject_create_and_add("btf", kernel_kobj); 31 if (!btf_kobj) 32 return -ENOMEM; 33 34 return sysfs_create_bin_file(btf_kobj, &bin_attr_btf_vmlinux); 35 } 36 37 subsys_initcall(btf_vmlinux_init); 38