mirror of
https://gitee.com/bianbu-linux/linux-6.6
synced 2025-04-24 14:07:52 -04:00
c454a46b5e
This patch adds bpf_line_info support. It accepts an array of bpf_line_info objects during BPF_PROG_LOAD. The "line_info", "line_info_cnt" and "line_info_rec_size" are added to the "union bpf_attr". The "line_info_rec_size" makes bpf_line_info extensible in the future. The new "check_btf_line()" ensures the userspace line_info is valid for the kernel to use. When the verifier is translating/patching the bpf_prog (through "bpf_patch_insn_single()"), the line_infos' insn_off is also adjusted by the newly added "bpf_adj_linfo()". If the bpf_prog is jited, this patch also provides the jited addrs (in aux->jited_linfo) for the corresponding line_info.insn_off. "bpf_prog_fill_jited_linfo()" is added to fill the aux->jited_linfo. It is currently called by the x86 jit. Other jits can also use "bpf_prog_fill_jited_linfo()" and it will be done in the followup patches. In the future, if it deemed necessary, a particular jit could also provide its own "bpf_prog_fill_jited_linfo()" implementation. A few "*line_info*" fields are added to the bpf_prog_info such that the user can get the xlated line_info back (i.e. the line_info with its insn_off reflecting the translated prog). The jited_line_info is available if the prog is jited. It is an array of __u64. If the prog is not jited, jited_line_info_cnt is 0. The verifier's verbose log with line_info will be done in a follow up patch. Signed-off-by: Martin KaFai Lau <kafai@fb.com> Acked-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
67 lines
2.1 KiB
C
67 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/* Copyright (c) 2018 Facebook */
|
|
|
|
#ifndef _LINUX_BTF_H
|
|
#define _LINUX_BTF_H 1
|
|
|
|
#include <linux/types.h>
|
|
|
|
struct btf;
|
|
struct btf_type;
|
|
union bpf_attr;
|
|
|
|
extern const struct file_operations btf_fops;
|
|
|
|
void btf_put(struct btf *btf);
|
|
int btf_new_fd(const union bpf_attr *attr);
|
|
struct btf *btf_get_by_fd(int fd);
|
|
int btf_get_info_by_fd(const struct btf *btf,
|
|
const union bpf_attr *attr,
|
|
union bpf_attr __user *uattr);
|
|
/* Figure out the size of a type_id. If type_id is a modifier
|
|
* (e.g. const), it will be resolved to find out the type with size.
|
|
*
|
|
* For example:
|
|
* In describing "const void *", type_id is "const" and "const"
|
|
* refers to "void *". The return type will be "void *".
|
|
*
|
|
* If type_id is a simple "int", then return type will be "int".
|
|
*
|
|
* @btf: struct btf object
|
|
* @type_id: Find out the size of type_id. The type_id of the return
|
|
* type is set to *type_id.
|
|
* @ret_size: It can be NULL. If not NULL, the size of the return
|
|
* type is set to *ret_size.
|
|
* Return: The btf_type (resolved to another type with size info if needed).
|
|
* NULL is returned if type_id itself does not have size info
|
|
* (e.g. void) or it cannot be resolved to another type that
|
|
* has size info.
|
|
* *type_id and *ret_size will not be changed in the
|
|
* NULL return case.
|
|
*/
|
|
const struct btf_type *btf_type_id_size(const struct btf *btf,
|
|
u32 *type_id,
|
|
u32 *ret_size);
|
|
void btf_type_seq_show(const struct btf *btf, u32 type_id, void *obj,
|
|
struct seq_file *m);
|
|
int btf_get_fd_by_id(u32 id);
|
|
u32 btf_id(const struct btf *btf);
|
|
bool btf_name_offset_valid(const struct btf *btf, u32 offset);
|
|
|
|
#ifdef CONFIG_BPF_SYSCALL
|
|
const struct btf_type *btf_type_by_id(const struct btf *btf, u32 type_id);
|
|
const char *btf_name_by_offset(const struct btf *btf, u32 offset);
|
|
#else
|
|
static inline const struct btf_type *btf_type_by_id(const struct btf *btf,
|
|
u32 type_id)
|
|
{
|
|
return NULL;
|
|
}
|
|
static inline const char *btf_name_by_offset(const struct btf *btf,
|
|
u32 offset)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
#endif
|