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45 lines
1.1 KiB
45 lines
1.1 KiB
// 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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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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