From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- kernel/bpf/sysfs_btf.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 kernel/bpf/sysfs_btf.c (limited to 'kernel/bpf/sysfs_btf.c') diff --git a/kernel/bpf/sysfs_btf.c b/kernel/bpf/sysfs_btf.c new file mode 100644 index 000000000..ef6911aee --- /dev/null +++ b/kernel/bpf/sysfs_btf.c @@ -0,0 +1,45 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Provide kernel BTF information for introspection and use by eBPF tools. + */ +#include +#include +#include +#include +#include + +/* 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, +}; + +struct kobject *btf_kobj; + +static int __init btf_vmlinux_init(void) +{ + bin_attr_btf_vmlinux.size = __stop_BTF - __start_BTF; + + if (!__start_BTF || bin_attr_btf_vmlinux.size == 0) + return 0; + + btf_kobj = kobject_create_and_add("btf", kernel_kobj); + if (!btf_kobj) + return -ENOMEM; + + return sysfs_create_bin_file(btf_kobj, &bin_attr_btf_vmlinux); +} + +subsys_initcall(btf_vmlinux_init); -- cgit v1.2.3