mirror of https://gitee.com/openkylin/linux.git
46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
// 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 __start_BTF[];
|
|
extern char __weak __stop_BTF[];
|
|
|
|
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, __start_BTF + 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 (!__start_BTF)
|
|
return 0;
|
|
|
|
btf_kobj = kobject_create_and_add("btf", kernel_kobj);
|
|
if (!btf_kobj)
|
|
return -ENOMEM;
|
|
|
|
bin_attr_btf_vmlinux.size = __stop_BTF - __start_BTF;
|
|
|
|
return sysfs_create_bin_file(btf_kobj, &bin_attr_btf_vmlinux);
|
|
}
|
|
|
|
subsys_initcall(btf_vmlinux_init);
|