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341dfcf8 AN |
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 __weak _binary__btf_kernel_bin_start[]; | |
13 | extern char __weak _binary__btf_kernel_bin_end[]; | |
14 | ||
15 | static ssize_t | |
16 | btf_kernel_read(struct file *file, struct kobject *kobj, | |
17 | struct bin_attribute *bin_attr, | |
18 | char *buf, loff_t off, size_t len) | |
19 | { | |
20 | memcpy(buf, _binary__btf_kernel_bin_start + off, len); | |
21 | return len; | |
22 | } | |
23 | ||
24 | static struct bin_attribute bin_attr_btf_kernel __ro_after_init = { | |
25 | .attr = { .name = "kernel", .mode = 0444, }, | |
26 | .read = btf_kernel_read, | |
27 | }; | |
28 | ||
29 | static struct kobject *btf_kobj; | |
30 | ||
31 | static int __init btf_kernel_init(void) | |
32 | { | |
33 | int err; | |
34 | ||
35 | if (!_binary__btf_kernel_bin_start) | |
36 | return 0; | |
37 | ||
38 | btf_kobj = kobject_create_and_add("btf", kernel_kobj); | |
39 | if (IS_ERR(btf_kobj)) { | |
40 | err = PTR_ERR(btf_kobj); | |
41 | btf_kobj = NULL; | |
42 | return err; | |
43 | } | |
44 | ||
45 | bin_attr_btf_kernel.size = _binary__btf_kernel_bin_end - | |
46 | _binary__btf_kernel_bin_start; | |
47 | ||
48 | return sysfs_create_bin_file(btf_kobj, &bin_attr_btf_kernel); | |
49 | } | |
50 | ||
51 | subsys_initcall(btf_kernel_init); |