openharmony/third_party_libbpf
1
0
Fork 0
mirror of https://gitee.com/openharmony/third_party_libbpf synced 2024-10-07 06:23:25 +00:00
Code Issues Actions 2 Packages Projects Releases Wiki Activity

add elfio interface

Browse Source 
Signed-off-by: Chenshi <chenshi51@huawei.com>
This commit is contained in:
Chenshi 2022-11-17 21:47:08 +08:00
parent 2cd2d03f63
commit 6a8736f44b
8 changed files with 1397 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

100
BUILD.gn Normal file
View File

@ -0,0 +1,100 @@
# Copyright (C) 2021 Huawei Device Co., Ltd.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import("//build/ohos.gni")
import("//build/ohos/ndk/ndk.gni")
config("libbpf_config") {
cflags = [
"-Wno-incompatible-pointer-types",
"-Wimplicit-function-declaration",
"-Wno-tautological-constant-out-of-range-compare",
"-Wno-constant-conversion",
"-Wno-unknown-attributes",
"-Wno-bitwise-op-parentheses",
"-Wno-shift-op-parentheses",
"-Wno-sign-compare",
"-Wno-unused-function",
"-fno-omit-frame-pointer",
"-mno-omit-leaf-frame-pointer",
"-fno-inline",
"-fno-optimize-sibling-calls",
"-ferror-limit=0",
"-Wno-unused-variable",
"-Wno-uninitialized",
]
defines = [
"HAVE_ELFIO",
]
}
config("libbpf_public_config") {
include_dirs = [
"./src",
"./include",
"./include/uapi",
"//third_party/zlib",
"//third_party/elfio/c_wrapper",
"//third_party/elfio/elfio",
]
}
ohos_shared_library("libbpf") {
deps = [
"//third_party/elfio:elfio",
"//third_party/zlib:libz",
]
sources = [
"./src/bpf.c",
"./src/bpf_core_read.h",
"./src/bpf_endian.h",
"./src/bpf_gen_internal.h",
"./src/bpf.h",
"./src/bpf_helper_defs.h",
"./src/bpf_helpers.h",
"./src/bpf_prog_linfo.c",
"./src/bpf_tracing.h",
"./src/btf.c",
"./src/btf_dump.c",
"./src/btf.h",
"./src/gen_loader.c",
"./src/hashmap.c",
"./src/hashmap.h",
"./src/libbpf.c",
"./src/libbpf_common.h",
"./src/libbpf_errno.c",
"./src/libbpf.h",
"./src/libbpf_internal.h",
"./src/libbpf_legacy.h",
"./src/libbpf_probes.c",
"./src/libbpf_version.h",
"./src/netlink.c",
"./src/nlattr.c",
"./src/nlattr.h",
"./src/relo_core.c",
"./src/relo_core.h",
"./src/ringbuf.c",
"./src/skel_internal.h",
"./src/str_error.c",
"./src/str_error.h",
"./src/strset.c",
"./src/strset.h",
"./src/xsk.c",
"./src/xsk.h",
]
configs = [ ":libbpf_config" ]
public_configs = [ ":libbpf_public_config" ]
subsystem_name = "developtools"
part_name = "profiler"
install_enable = true
}

541
NOTICE Normal file
View File

@ -0,0 +1,541 @@
Version 0.7
==============================================================================
The libbpf is under LGPL-2.1 OR BSD-2-Clause:
==============================================================================
Valid-License-Identifier: LGPL-2.1
Valid-License-Identifier: LGPL-2.1+
SPDX-URL: https://spdx.org/licenses/LGPL-2.1.html
Usage-Guide:
To use this license in source code, put one of the following SPDX
tag/value pairs into a comment according to the placement
guidelines in the licensing rules documentation.
For 'GNU Lesser General Public License (LGPL) version 2.1 only' use:
SPDX-License-Identifier: LGPL-2.1
For 'GNU Lesser General Public License (LGPL) version 2.1 or any later
version' use:
SPDX-License-Identifier: LGPL-2.1+
License-Text:
GNU LESSER GENERAL PUBLIC LICENSE
Version 2.1, February 1999
Copyright (C) 1991, 1999 Free Software Foundation, Inc.
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.
[This is the first released version of the Lesser GPL. It also counts as
the successor of the GNU Library Public License, version 2, hence the
version number 2.1.]
Preamble
The licenses for most software are designed to take away your freedom to
share and change it. By contrast, the GNU General Public Licenses are
intended to guarantee your freedom to share and change free software--to
make sure the software is free for all its users.
This license, the Lesser General Public License, applies to some specially
designated software packages--typically libraries--of the Free Software
Foundation and other authors who decide to use it. You can use it too, but
we suggest you first think carefully about whether this license or the
ordinary General Public License is the better strategy to use in any
particular case, based on the explanations below.
When we speak of free software, we are referring to freedom of use, not
price. Our General Public Licenses are designed to make sure that you have
the freedom to distribute copies of free software (and charge for this
service if you wish); that you receive source code or can get it if you
want it; that you can change the software and use pieces of it in new free
programs; and that you are informed that you can do these things.
To protect your rights, we need to make restrictions that forbid
distributors to deny you these rights or to ask you to surrender these
rights. These restrictions translate to certain responsibilities for you if
you distribute copies of the library or if you modify it.
For example, if you distribute copies of the library, whether gratis or for
a fee, you must give the recipients all the rights that we gave you. You
must make sure that they, too, receive or can get the source code. If you
link other code with the library, you must provide complete object files to
the recipients, so that they can relink them with the library after making
changes to the library and recompiling it. And you must show them these
terms so they know their rights.
We protect your rights with a two-step method: (1) we copyright the
library, and (2) we offer you this license, which gives you legal
permission to copy, distribute and/or modify the library.
To protect each distributor, we want to make it very clear that there is no
warranty for the free library. Also, if the library is modified by someone
else and passed on, the recipients should know that what they have is not
the original version, so that the original author's reputation will not be
affected by problems that might be introduced by others.
Finally, software patents pose a constant threat to the existence of any
free program. We wish to make sure that a company cannot effectively
restrict the users of a free program by obtaining a restrictive license
from a patent holder. Therefore, we insist that any patent license obtained
for a version of the library must be consistent with the full freedom of
use specified in this license.
Most GNU software, including some libraries, is covered by the ordinary GNU
General Public License. This license, the GNU Lesser General Public
License, applies to certain designated libraries, and is quite different
from the ordinary General Public License. We use this license for certain
libraries in order to permit linking those libraries into non-free
programs.
When a program is linked with a library, whether statically or using a
shared library, the combination of the two is legally speaking a combined
work, a derivative of the original library. The ordinary General Public
License therefore permits such linking only if the entire combination fits
its criteria of freedom. The Lesser General Public License permits more lax
criteria for linking other code with the library.
We call this license the "Lesser" General Public License because it does
Less to protect the user's freedom than the ordinary General Public
License. It also provides other free software developers Less of an
advantage over competing non-free programs. These disadvantages are the
reason we use the ordinary General Public License for many
libraries. However, the Lesser license provides advantages in certain
special circumstances.
For example, on rare occasions, there may be a special need to encourage
the widest possible use of a certain library, so that it becomes a de-facto
standard. To achieve this, non-free programs must be allowed to use the
library. A more frequent case is that a free library does the same job as
widely used non-free libraries. In this case, there is little to gain by
limiting the free library to free software only, so we use the Lesser
General Public License.
In other cases, permission to use a particular library in non-free programs
enables a greater number of people to use a large body of free
software. For example, permission to use the GNU C Library in non-free
programs enables many more people to use the whole GNU operating system, as
well as its variant, the GNU/Linux operating system.
Although the Lesser General Public License is Less protective of the users'
freedom, it does ensure that the user of a program that is linked with the
Library has the freedom and the wherewithal to run that program using a
modified version of the Library.
The precise terms and conditions for copying, distribution and modification
follow. Pay close attention to the difference between a "work based on the
library" and a "work that uses the library". The former contains code
derived from the library, whereas the latter must be combined with the
library in order to run.
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. This License Agreement applies to any software library or other program
which contains a notice placed by the copyright holder or other
authorized party saying it may be distributed under the terms of this
Lesser General Public License (also called "this License"). Each
licensee is addressed as "you".
A "library" means a collection of software functions and/or data
prepared so as to be conveniently linked with application programs
(which use some of those functions and data) to form executables.
The "Library", below, refers to any such software library or work which
has been distributed under these terms. A "work based on the Library"
means either the Library or any derivative work under copyright law:
that is to say, a work containing the Library or a portion of it, either
verbatim or with modifications and/or translated straightforwardly into
another language. (Hereinafter, translation is included without
limitation in the term "modification".)
"Source code" for a work means the preferred form of the work for making
modifications to it. For a library, complete source code means all the
source code for all modules it contains, plus any associated interface
definition files, plus the scripts used to control compilation and
installation of the library.
Activities other than copying, distribution and modification are not
covered by this License; they are outside its scope. The act of running
a program using the Library is not restricted, and output from such a
program is covered only if its contents constitute a work based on the
Library (independent of the use of the Library in a tool for writing
it). Whether that is true depends on what the Library does and what the
program that uses the Library does.
1. You may copy and distribute verbatim copies of the Library's complete
source code as you receive it, in any medium, provided that you
conspicuously and appropriately publish on each copy an appropriate
copyright notice and disclaimer of warranty; keep intact all the notices
that refer to this License and to the absence of any warranty; and
distribute a copy of this License along with the Library.
You may charge a fee for the physical act of transferring a copy, and
you may at your option offer warranty protection in exchange for a fee.
2. You may modify your copy or copies of the Library or any portion of it,
thus forming a work based on the Library, and copy and distribute such
modifications or work under the terms of Section 1 above, provided that
you also meet all of these conditions:
a) The modified work must itself be a software library.
b) You must cause the files modified to carry prominent notices stating
that you changed the files and the date of any change.
c) You must cause the whole of the work to be licensed at no charge to
all third parties under the terms of this License.
d) If a facility in the modified Library refers to a function or a table
of data to be supplied by an application program that uses the
facility, other than as an argument passed when the facility is
invoked, then you must make a good faith effort to ensure that, in
the event an application does not supply such function or table, the
facility still operates, and performs whatever part of its purpose
remains meaningful.
(For example, a function in a library to compute square roots has a
purpose that is entirely well-defined independent of the
application. Therefore, Subsection 2d requires that any
application-supplied function or table used by this function must be
optional: if the application does not supply it, the square root
function must still compute square roots.)
These requirements apply to the modified work as a whole. If
identifiable sections of that work are not derived from the Library, and
can be reasonably considered independent and separate works in
themselves, then this License, and its terms, do not apply to those
sections when you distribute them as separate works. But when you
distribute the same sections as part of a whole which is a work based on
the Library, the distribution of the whole must be on the terms of this
License, whose permissions for other licensees extend to the entire
whole, and thus to each and every part regardless of who wrote it.
Thus, it is not the intent of this section to claim rights or contest
your rights to work written entirely by you; rather, the intent is to
exercise the right to control the distribution of derivative or
collective works based on the Library.
In addition, mere aggregation of another work not based on the Library
with the Library (or with a work based on the Library) on a volume of a
storage or distribution medium does not bring the other work under the
scope of this License.
3. You may opt to apply the terms of the ordinary GNU General Public
License instead of this License to a given copy of the Library. To do
this, you must alter all the notices that refer to this License, so that
they refer to the ordinary GNU General Public License, version 2,
instead of to this License. (If a newer version than version 2 of the
ordinary GNU General Public License has appeared, then you can specify
that version instead if you wish.) Do not make any other change in these
notices.
Once this change is made in a given copy, it is irreversible for that
copy, so the ordinary GNU General Public License applies to all
subsequent copies and derivative works made from that copy.
This option is useful when you wish to copy part of the code of the
Library into a program that is not a library.
4. You may copy and distribute the Library (or a portion or derivative of
it, under Section 2) in object code or executable form under the terms
of Sections 1 and 2 above provided that you accompany it with the
complete corresponding machine-readable source code, which must be
distributed under the terms of Sections 1 and 2 above on a medium
customarily used for software interchange.
If distribution of object code is made by offering access to copy from a
designated place, then offering equivalent access to copy the source
code from the same place satisfies the requirement to distribute the
source code, even though third parties are not compelled to copy the
source along with the object code.
5. A program that contains no derivative of any portion of the Library, but
is designed to work with the Library by being compiled or linked with
it, is called a "work that uses the Library". Such a work, in isolation,
is not a derivative work of the Library, and therefore falls outside the
scope of this License.
However, linking a "work that uses the Library" with the Library creates
an executable that is a derivative of the Library (because it contains
portions of the Library), rather than a "work that uses the
library". The executable is therefore covered by this License. Section 6
states terms for distribution of such executables.
When a "work that uses the Library" uses material from a header file
that is part of the Library, the object code for the work may be a
derivative work of the Library even though the source code is
not. Whether this is true is especially significant if the work can be
linked without the Library, or if the work is itself a library. The
threshold for this to be true is not precisely defined by law.
If such an object file uses only numerical parameters, data structure
layouts and accessors, and small macros and small inline functions (ten
lines or less in length), then the use of the object file is
unrestricted, regardless of whether it is legally a derivative
work. (Executables containing this object code plus portions of the
Library will still fall under Section 6.)
Otherwise, if the work is a derivative of the Library, you may
distribute the object code for the work under the terms of Section
6. Any executables containing that work also fall under Section 6,
whether or not they are linked directly with the Library itself.
6. As an exception to the Sections above, you may also combine or link a
"work that uses the Library" with the Library to produce a work
containing portions of the Library, and distribute that work under terms
of your choice, provided that the terms permit modification of the work
for the customer's own use and reverse engineering for debugging such
modifications.
You must give prominent notice with each copy of the work that the
Library is used in it and that the Library and its use are covered by
this License. You must supply a copy of this License. If the work during
execution displays copyright notices, you must include the copyright
notice for the Library among them, as well as a reference directing the
user to the copy of this License. Also, you must do one of these things:
a) Accompany the work with the complete corresponding machine-readable
source code for the Library including whatever changes were used in
the work (which must be distributed under Sections 1 and 2 above);
and, if the work is an executable linked with the Library, with the
complete machine-readable "work that uses the Library", as object
code and/or source code, so that the user can modify the Library and
then relink to produce a modified executable containing the modified
Library. (It is understood that the user who changes the contents of
definitions files in the Library will not necessarily be able to
recompile the application to use the modified definitions.)
b) Use a suitable shared library mechanism for linking with the
Library. A suitable mechanism is one that (1) uses at run time a copy
of the library already present on the user's computer system, rather
than copying library functions into the executable, and (2) will
operate properly with a modified version of the library, if the user
installs one, as long as the modified version is interface-compatible
with the version that the work was made with.
c) Accompany the work with a written offer, valid for at least three
years, to give the same user the materials specified in Subsection
6a, above, for a charge no more than the cost of performing this
distribution.
d) If distribution of the work is made by offering access to copy from a
designated place, offer equivalent access to copy the above specified
materials from the same place.
e) Verify that the user has already received a copy of these materials
or that you have already sent this user a copy.
For an executable, the required form of the "work that uses the Library"
must include any data and utility programs needed for reproducing the
executable from it. However, as a special exception, the materials to be
distributed need not include anything that is normally distributed (in
either source or binary form) with the major components (compiler,
kernel, and so on) of the operating system on which the executable runs,
unless that component itself accompanies the executable.
It may happen that this requirement contradicts the license restrictions
of other proprietary libraries that do not normally accompany the
operating system. Such a contradiction means you cannot use both them
and the Library together in an executable that you distribute.
7. You may place library facilities that are a work based on the Library
side-by-side in a single library together with other library facilities
not covered by this License, and distribute such a combined library,
provided that the separate distribution of the work based on the Library
and of the other library facilities is otherwise permitted, and provided
that you do these two things:
a) Accompany the combined library with a copy of the same work based on
the Library, uncombined with any other library facilities. This must
be distributed under the terms of the Sections above.
b) Give prominent notice with the combined library of the fact that part
of it is a work based on the Library, and explaining where to find
the accompanying uncombined form of the same work.
8. You may not copy, modify, sublicense, link with, or distribute the
Library except as expressly provided under this License. Any attempt
otherwise to copy, modify, sublicense, link with, or distribute the
Library is void, and will automatically terminate your rights under this
License. However, parties who have received copies, or rights, from you
under this License will not have their licenses terminated so long as
such parties remain in full compliance.
9. You are not required to accept this License, since you have not signed
it. However, nothing else grants you permission to modify or distribute
the Library or its derivative works. These actions are prohibited by law
if you do not accept this License. Therefore, by modifying or
distributing the Library (or any work based on the Library), you
indicate your acceptance of this License to do so, and all its terms and
conditions for copying, distributing or modifying the Library or works
based on it.
10. Each time you redistribute the Library (or any work based on the
Library), the recipient automatically receives a license from the
original licensor to copy, distribute, link with or modify the Library
subject to these terms and conditions. You may not impose any further
restrictions on the recipients' exercise of the rights granted
herein. You are not responsible for enforcing compliance by third
parties with this License.
11. If, as a consequence of a court judgment or allegation of patent
infringement or for any other reason (not limited to patent issues),
conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License. If you cannot
distribute so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you
may not distribute the Library at all. For example, if a patent license
would not permit royalty-free redistribution of the Library by all
those who receive copies directly or indirectly through you, then the
only way you could satisfy both it and this License would be to refrain
entirely from distribution of the Library.
If any portion of this section is held invalid or unenforceable under
any particular circumstance, the balance of the section is intended to
apply, and the section as a whole is intended to apply in other
circumstances.
It is not the purpose of this section to induce you to infringe any
patents or other property right claims or to contest validity of any
such claims; this section has the sole purpose of protecting the
integrity of the free software distribution system which is implemented
by public license practices. Many people have made generous
contributions to the wide range of software distributed through that
system in reliance on consistent application of that system; it is up
to the author/donor to decide if he or she is willing to distribute
software through any other system and a licensee cannot impose that
choice.
This section is intended to make thoroughly clear what is believed to
be a consequence of the rest of this License.
12. If the distribution and/or use of the Library is restricted in certain
countries either by patents or by copyrighted interfaces, the original
copyright holder who places the Library under this License may add an
explicit geographical distribution limitation excluding those
countries, so that distribution is permitted only in or among countries
not thus excluded. In such case, this License incorporates the
limitation as if written in the body of this License.
13. The Free Software Foundation may publish revised and/or new versions of
the Lesser General Public License from time to time. Such new versions
will be similar in spirit to the present version, but may differ in
detail to address new problems or concerns.
Each version is given a distinguishing version number. If the Library
specifies a version number of this License which applies to it and "any
later version", you have the option of following the terms and
conditions either of that version or of any later version published by
the Free Software Foundation. If the Library does not specify a license
version number, you may choose any version ever published by the Free
Software Foundation.
14. If you wish to incorporate parts of the Library into other free
programs whose distribution conditions are incompatible with these,
write to the author to ask for permission. For software which is
copyrighted by the Free Software Foundation, write to the Free Software
Foundation; we sometimes make exceptions for this. Our decision will be
guided by the two goals of preserving the free status of all
derivatives of our free software and of promoting the sharing and reuse
of software generally.
NO WARRANTY
15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE LIBRARY IS WITH
YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL
NECESSARY SERVICING, REPAIR OR CORRECTION.
16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU FOR
DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL
DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE LIBRARY
(INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED
INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF
THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF SUCH HOLDER OR
OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Libraries
If you develop a new library, and you want it to be of the greatest
possible use to the public, we recommend making it free software that
everyone can redistribute and change. You can do so by permitting
redistribution under these terms (or, alternatively, under the terms of the
ordinary General Public License).
To apply these terms, attach the following notices to the library. It is
safest to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least the
"copyright" line and a pointer to where the full notice is found.
one line to give the library's name and an idea of what it does.
Copyright (C) year name of author
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or (at
your option) any later version.
This library is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
for more details.
You should have received a copy of the GNU Lesser General Public License
along with this library; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA Also add
information on how to contact you by electronic and paper mail.
You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the library, if
necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in
the library `Frob' (a library for tweaking knobs) written
by James Random Hacker.
signature of Ty Coon, 1 April 1990
Ty Coon, President of Vice
That's all there is to it!
Valid-License-Identifier: BSD-2-Clause
SPDX-URL: https://spdx.org/licenses/BSD-2-Clause.html
Usage-Guide:
To use the BSD 2-clause "Simplified" License put the following SPDX
tag/value pair into a comment according to the placement guidelines in
the licensing rules documentation:
SPDX-License-Identifier: BSD-2-Clause
License-Text:
Copyright (c) <year> <owner> . All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.

11
README.OpenSource Normal file
View File

@ -0,0 +1,11 @@
[
{
"Name": "libbpf",
"License": "LGPL-2.1 OR BSD-2-Clause",
"License File": "LICENSE",
"Version Number": "0.7",
"Owner": "xiazhonglin@huawei.com",
"Upstream URL": "https://github.com/libbpf/libbpf",
"Description": "a third party library to use eBPF"
}
]

92
README_OH.md Normal file
View File

@ -0,0 +1,92 @@
# libbpf
仓库包含第三方开源软件libbpf，libbpf是eBPF技术的一种实现，eBPF提供给开发者一种内核事件和用户进程事件发生时安全注入代码的机制，避免开发者直接进行内核编程时可能导致的系统锁定、内存损坏、进程崩溃和安全漏洞等问题。开发者基于libbpf第三方开源库高效便捷开发eBPF程序，应用于网络过滤、程序跟踪、性能分析以及调试等需求场景。
# 目录结构
```
docs/ 文档
fuzz/ fuzz测试
include/ 头文件
scripts/ 脚本
src/ 源文件
LICENSE 证书文件
README.md 英文说明
README_zh.md 中文说明
```
# OpenHarmony如何集成libbpf
## 1.头文件引入
```
#include "libbpf.h"
#include "bpf.h"
```
## 2.BUILD.gn添加引用
```
deps += ["//third_party/libbpf:libbpf"]
```
## 3.示例代码
```
# kprobe.bpf.c BPF程序
# 指定LICENSE
char LICENSE[] SEC("license") = "Dual BSD/GPL";
# 进入do_unlinkat函数时调用
SEC("kprobe/do_unlinkat")
int BPF_KPROBE(do_unlinkat, int dfd, struct filename *name)
{
pid_t pid;
const char *filename;
pid = bpf_get_current_pid_tgid() >> 32;
filename = BPF_CORE_READ(name, name);
bpf_printk("KPROBE ENTRY pid = %d, filename = %s\n", pid, filename);
return 0;
}
# 退出do_unlinkat函数时调用
SEC("kretprobe/do_unlinkat")
int BPF_KRETPROBE(do_unlinkat_exit, long ret)
{
pid_t pid;
pid = bpf_get_current_pid_tgid() >> 32;
bpf_printk("KPROBE EXIT: pid = %d, ret = %ld\n", pid, ret);
return 0;
}
```
```
# 用bpftool生成BPF skeleton脚手架文件
$ bpftool gen skeleton kprobe.bpf.o > kprobe.skel.h
```
```
# kprobe.c 将BPF程序加载进内核并附着到内核指定位置
#include kprobe.skel.h
struct kprobe_bpf *skel;
int err;
libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
/* 加载并验证BPF程序 */
skel = kprobe_bpf__open_and_load();
if (!skel) {
fprintf(stderr, "Failed to open BPF skeleton\n");
return 1;
}
/* 将BPF程序附加到跟踪点 */
err = kprobe_bpf__attach(skel);
/* 销毁和回收资源 */
kprobe_bpf__destroy(skel);
```
# libbpf相关知识文档
bpf参考指南[https://nakryiko.com/posts/bpf-core-reference-guide/](https://nakryiko.com/posts/bpf-core-reference-guide/)
libbpf开发指导[https://nakryiko.com/posts/bcc-to-libbpf-howto-guide/](https://nakryiko.com/posts/bcc-to-libbpf-howto-guide/)
libbpf开发示例[https://github.com/libbpf/libbpf-bootstrap](https://github.com/libbpf/libbpf-bootstrap)
# License
`SPDX-License-Identifier: BSD-2-Clause OR LGPL-2.1`
‍

153
README_zh.md Normal file
View File

@ -0,0 +1,153 @@
这是[Linux源码bpf](https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next)的`tools/lib/bpf`​目录及其支持的头文件的一个镜像。同步的所有细节都可以在`scripts/sync-kernel.sh`​脚本中找到。
此仓中的一些头文件（`include/linux/*.h`​）对应文件是[Linux源码bpf](https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next)的`tools/include/linux/*.h，使得libbpf能够编译成功。
# BPF/libbpf用法和问题
请查看[libbpf引导程序](https://github.com/libbpf/libbpf-bootstrap)和配套得[博客文章](https://nakryiko.com/posts/libbpf-bootstrap/)，使用libbpf构建BPF应用程序的示例。
[libbpf-tools](https://github.com/iovisor/bcc/tree/master/libbpf-tools)也是基于libbpf的跟踪工具的一个很好的实现。
另请参见[“BPF CO-RE参考指南”](https://nakryiko.com/posts/bpf-core-reference-guide/)，涵盖构建BPF CO-RE应用程序的实际方面，
以及[“BPF CO-RE”](https://nakryiko.com/posts/bpf-portability-and-co-re/)对于BPF可移植性问题和BPF CO-RE起源的一般介绍。
所有一般BPF问题，包括内核功能、libbpf API以及申请，应发送邮件至[bpf@vger.kernel.org](mailto:bpf@vger.kernel.org)。
你可以订阅[此处](http://vger.kernel.org/vger-lists.html#bpf)和搜索其档案[此处](https://lore.kernel.org/bpf/). 在提出新问题之前请搜索档案，很可能这已经是在之前被定位或回答。
[bpf@vger.kernel.org](mailto:bpf@vger.kernel.org)被很多人管理，他们会很乐意尝试帮助你解决任何问题。
# 构建指导
libelf是libbpf的内部依赖项，因此需要链接并且必须安装在系统上，应用程序才能工作。
pkg-config默认用于查找libelf，调用的程序可以是用“PKG_CONFIG”重写。
如果不希望在构建时使用“pkg config”，可以通过调用make时设置`NO_PKG_CONFIG=1`​。
构建静态库libbpf.a和动态库libbpf.so：
```
$cd src
$make
```
仅生成静态库libbpf.a
```
$cd src
$mkdir build root
$BUILD_STATIC_ONLY=y OBJDIR=build DESTDIR=root make install
```
构建静态库libbpf.a和动态库libbpf.so
```
$cd src
$PKG_CONFIG_PATH=/build/root/lib64/pkgconfig DESTDIR=/build/root make install
```
# 发行版
从此镜像打包libbpf的发行版：
-[Fedora](https://src.fedoraproject.org/rpms/libbpf)
-[Gentoo](https://packages.gentoo.org/packages/dev-libs/libbpf)
-[Debian](https://packages.debian.org/source/sid/libbpf)
-[Arch](https://www.archlinux.org/packages/extra/x86_64/libbpf/)
-[Ubuntu](https://packages.ubuntu.com/source/impish/libbpf)
-[Alpine](https://pkgs.alpinelinux.org/packages?name=libbpf)
从镜像打包优于从内核源打包的好处：
* 跨发行版的一致版本控制。
* 与任何特定内核无关，对旧内核的透明处理。
Libbpf被设计为内核不可知的，可以跨多个内核版本。
它有内置的机制，可以兼容老版本缺少某些功能的内核
因此，libbpf没有绑定到特定的内核版本，并且可以/应该独立地打包和版本化。
* 通过以下方式进行持续集成测试
[TravisCI](https://travis-ci.org/libbpf/libbpf).
* 通过[LGTM](https://lgtm.com/projects/g/libbpf/libbpf)和[Coverity](https://scan.coverity.com/projects/libbpf)进行静态代码分析
libbpf的包依赖性，包名称可能因发行版而异：
* zlib
* libelf
# BPF CO-RE（编译一次-到处运行）
libbpf支持构建支持BPF CO-RE的应用程序，这与[BCC](https://github.com/iovisor/bcc/)不同，不需要Clang/LLVM运行时部署到目标服务器并且不依赖于内核层的headers可用。
但是它依赖于使用[BTF](https://www.kernel.org/doc/html/latest/bpf/btf.html)构建的内核
尽管如此，一些主要的Linux发行版已经内置了内核BTF：
* Fedora31+
* RHEL 8.2+
* OpenSUSE Tumbleweed（下一个版本，截至2020-06-04）
* Arch Linux（来自内核5.7.1.arch1-1）
* Manjaro（如果在2021 06月18日之后编译，则来自内核5.4）
* Ubuntu 20.10
* Debian 11（amd64/arm64）
如果您的内核没有内置BTF，则需要构建自定义内核
您需要：
* pahole 1.16+工具（dwarves包的一部分），用于执行DWARF到BTF转换；
* 使用`CONFIG_DEBUG_INFO_BTF=y`​选项构建的内核；
* 您可以通过查找`/sys/kernel/btf/vmlinux`​文件来检查内核是否内置了BTF：
```
$ ls -la /sys/kernel/btf/vmlinux
-r--r--r--. 1 root root 3541561 Jun 2 18:16 /sys/kernel/btf/vmlinux
```
要开发和构建BPF程序，您需要Clang/LLVM 10+。以下发行版默认情况下具有Clang/LLVM 10+包：
* Fedora 32+
* Ubuntu 20.04+
* Arch Linux
* Ubuntu 20.10（LLVM 11）
* Debian 11（LLVM 11）
* Alpine 3.13+
否则，请确保在您的系统上更新它。
以下资源有助于理解什么是BPF CO-RE以及如何使用它：
* [BPF CO-RE参考指南](https://nakryiko.com/posts/bpf-core-reference-guide/)
* [BPF可移植性和CO-RE](https://nakryiko.com/posts/bpf-portability-and-co-re/)
* [HOWTO:BCC到libbpf的转换](https://nakryiko.com/posts/bcc-to-libbpf-howto-guide/)
* [BCC仓库中的libbpf工具](https://github.com/iovisor/bcc/tree/master/libbpf-tools)
# 许可证
本作品根据BSD 2条款许可证和GNU LGPL v2.1许可证双重许可。
如果您使用这项工作，您可以在其中一项中进行选择。
`SPDX-License-Identifier: BSD-2-Clause OR LGPL-2.1`

31
bundle.json Normal file
View File

@ -0,0 +1,31 @@
{
"name": "@ohos/libbpf",
"description": "Libbpf is a set of tools for building BPF applications",
"version": "Release_0.7.0",
"license": "LGPL-2.1 OR BSD-2-Clause License",
"publishAs": "code-segment",
"segment": {
"destPath": "third_party/libbpf"
},
"dirs": {},
"scripts": {},
"licensePath": "LICENSE",
"component": {
"name": "libbpf",
"subsystem": "thirdparty",
"syscap": [],
"features": [],
"adapted_system_type": [],
"rom": "",
"ram": "",
"deps": {
"components": [],
"third_party": []
},
"build": {
"sub_component": [],
"inner_kits": [],
"test": []
}
}
}

113
src/btf.c
View File

@ -15,7 +15,22 @@
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/btf.h>
#ifdef HAVE_LIBELF
#include <gelf.h>
#endif
#ifdef HAVE_ELFIO
#include "elfio_c_wrapper.h"
typedef struct Elf64_Ehdr Elf64_Ehdr;
typedef struct Elf64_Shdr Elf64_Shdr;
typedef struct {
void *d_buf;
size_t d_size;
} Elf_Data;
#endif
#include "btf.h"
#include "bpf.h"
#include "libbpf.h"
@ -885,22 +900,50 @@ struct btf *btf__new(const void *data, __u32 size)
return libbpf_ptr(btf_new(data, size, NULL));
}
#ifdef HAVE_ELFIO
static Elf64_Shdr *elf_sec_hdr_by_idx(pelfio_t elf, size_t idx, Elf64_Shdr *sheader)
{
psection_t psection = elfio_get_section_by_index(elf, idx);
sheader->sh_name = elfio_section_get_name_string_offset(psection);
sheader->sh_type = elfio_section_get_type(psection);
sheader->sh_flags = elfio_section_get_flags(psection);
sheader->sh_addr = elfio_section_get_address(psection);
sheader->sh_offset = elfio_section_get_offset(psection);
sheader->sh_size = elfio_section_get_size(psection);
sheader->sh_link = elfio_section_get_link(psection);
sheader->sh_info = elfio_section_get_info(psection);
sheader->sh_addralign = elfio_section_get_addr_align(psection);
sheader->sh_entsize = elfio_section_get_entry_size(psection);
return sheader;
}
#endif
static struct btf *btf_parse_elf(const char *path, struct btf *base_btf,
struct btf_ext **btf_ext)
{
Elf_Data *btf_data = NULL, *btf_ext_data = NULL;
int err = 0, fd = -1, idx = 0;
struct btf *btf = NULL;
#ifdef HAVE_LIBELF
Elf_Scn *scn = NULL;
Elf *elf = NULL;
GElf_Ehdr ehdr;
#elif defined HAVE_ELFIO
pelfio_t elf;
Elf64_Ehdr ehdr;
Elf_Data btf_data_temp, btf_ext_data_temp;
#endif
size_t shstrndx;
#ifdef HAVE_LIBELF
if (elf_version(EV_CURRENT) == EV_NONE) {
pr_warn("failed to init libelf for %s\n", path);
return ERR_PTR(-LIBBPF_ERRNO__LIBELF);
}
#endif
fd = open(path, O_RDONLY | O_CLOEXEC);
if (fd < 0) {
err = -errno;
@ -910,45 +953,96 @@ static struct btf *btf_parse_elf(const char *path, struct btf *base_btf,
err = -LIBBPF_ERRNO__FORMAT;
#ifdef HAVE_LIBELF
elf = elf_begin(fd, ELF_C_READ, NULL);
#elif defined HAVE_ELFIO
elf = elfio_new();
if (!elfio_load(elf, path)) {
printf( "Can't load ELF file\n" );
goto done;
}
#endif
if (!elf) {
pr_warn("failed to open %s as ELF file\n", path);
goto done;
}
#ifdef HAVE_LIBELF
if (!gelf_getehdr(elf, &ehdr)) {
#elif defined HAVE_ELFIO
ssize_t nread = read(fd, &ehdr, sizeof(Elf64_Ehdr));
if(nread != sizeof(Elf64_Ehdr)) {
#endif
pr_warn("failed to get EHDR from %s\n", path);
goto done;
}
#ifdef HAVE_LIBELF
if (elf_getshdrstrndx(elf, &shstrndx)) {
#elif defined HAVE_ELFIO
shstrndx = elfio_get_section_name_str_index(elf);
if(shstrndx < 0) {
#endif
pr_warn("failed to get section names section index for %s\n",
path);
goto done;
}
#ifdef HAVE_LIBELF
if (!elf_rawdata(elf_getscn(elf, shstrndx), NULL)) {
pr_warn("failed to get e_shstrndx from %s\n", path);
goto done;
}
#endif
#if defined HAVE_LIBELF
while ((scn = elf_nextscn(elf, scn)) != NULL) {
GElf_Shdr sh;
#elif defined HAVE_ELFIO
psection_t psection = elfio_get_section_by_name(elf, ".shstrtab");
if (!psection )
goto done;
pstring_t pstring = elfio_string_section_accessor_new(psection);
if (!pstring )
goto done;
int secno = elfio_get_sections_num(elf);
for ( int i = 0; i < secno; i++ ) {
Elf64_Shdr sh;
#endif
char *name;
idx++;
#if defined HAVE_LIBELF
if (gelf_getshdr(scn, &sh) != &sh) {
#elif defined HAVE_ELFIO
if (!elf_sec_hdr_by_idx(elf, i, &sh)) {
#endif
pr_warn("failed to get section(%d) header from %s\n",
idx, path);
goto done;
}
#if defined HAVE_LIBELF
name = elf_strptr(elf, shstrndx, sh.sh_name);
#elif defined HAVE_ELFIO
name = elfio_string_get_string(pstring, sh.sh_name);
#endif
if (!name) {
pr_warn("failed to get section(%d) name from %s\n",
idx, path);
goto done;
}
if (strcmp(name, BTF_ELF_SEC) == 0) {
#if defined HAVE_LIBELF
btf_data = elf_getdata(scn, 0);
#elif defined HAVE_ELFIO
psection_t psection_index = elfio_get_section_by_index(elf, i);
btf_data_temp.d_buf = (void*)elfio_section_get_data(psection_index);
btf_data_temp.d_size = elfio_section_get_size(psection_index);
btf_data = &btf_data_temp;
#endif
if (!btf_data) {
pr_warn("failed to get section(%d, %s) data from %s\n",
idx, name, path);
@ -956,7 +1050,14 @@ static struct btf *btf_parse_elf(const char *path, struct btf *base_btf,
}
continue;
} else if (btf_ext && strcmp(name, BTF_EXT_ELF_SEC) == 0) {
#if defined HAVE_LIBELF
btf_ext_data = elf_getdata(scn, 0);
#elif defined HAVE_ELFIO
psection_t psection_index = elfio_get_section_by_index(elf, i);
btf_ext_data_temp.d_buf = (void*)elfio_section_get_data(psection_index);
btf_ext_data_temp.d_size = elfio_section_get_size(psection_index);
btf_ext_data = &btf_ext_data_temp;
#endif
if (!btf_ext_data) {
pr_warn("failed to get section(%d, %s) data from %s\n",
idx, name, path);
@ -977,7 +1078,11 @@ static struct btf *btf_parse_elf(const char *path, struct btf *base_btf,
if (err)
goto done;
#ifdef HAVE_LIBELF
switch (gelf_getclass(elf)) {
#elif defined HAVE_ELFIO
switch (elfio_get_class(elf)) {
#endif
case ELFCLASS32:
btf__set_pointer_size(btf, 4);
break;
@ -999,7 +1104,13 @@ static struct btf *btf_parse_elf(const char *path, struct btf *base_btf,
}
done:
if (elf)
#ifdef HAVE_LIBELF
elf_end(elf);
#elif defined HAVE_ELFIO
elfio_delete(elf);
if(pstring)
elfio_string_section_accessor_delete(pstring);
#endif
close(fd);
if (!err)
@ -4683,7 +4794,9 @@ struct btf *btf__load_vmlinux_btf(void)
if (locations[i].raw_btf)
btf = btf__parse_raw(path);
else
#ifdef HAVE_LIBELF
btf = btf__parse_elf(path, NULL);
#endif
err = libbpf_get_error(btf);
pr_debug("loading kernel BTF '%s': %d\n", path, err);
if (err)

356
src/libbpf.c
View File

@ -44,8 +44,11 @@
#include <sys/vfs.h>
#include <sys/utsname.h>
#include <sys/resource.h>
#ifdef HAVE_LIBELF
#include <libelf.h>
#include <gelf.h>
#endif
#include <zlib.h>
#include "libbpf.h"
@ -56,6 +59,27 @@
#include "hashmap.h"
#include "bpf_gen_internal.h"
#ifdef HAVE_ELFIO
#include "elfio_c_wrapper.h"
#include <linux/memfd.h>
#include <sys/syscall.h>
#include <limits.h>
typedef struct Elf64_Ehdr Elf64_Ehdr;
typedef struct Elf64_Shdr Elf64_Shdr;
typedef struct Elf64_Sym Elf64_Sym;
typedef struct Elf64_Rel Elf64_Rel;
typedef struct {
void *d_buf;
size_t d_size;
} Elf_Data;
#define ELF64_ST_TYPE(val) ELF_ST_TYPE (val)
#define ELF64_ST_BIND(val) ELF_ST_BIND (val)
#define elf_errmsg(val) "error"
#endif
#ifndef BPF_FS_MAGIC
#define BPF_FS_MAGIC 0xcafe4a11
#endif
@ -464,7 +488,12 @@ enum sec_type {
struct elf_sec_desc {
enum sec_type sec_type;
#if defined HAVE_LIBELF
Elf64_Shdr *shdr;
#elif defined HAVE_ELFIO
psection_t psection;
Elf_Data realdata;
#endif
Elf_Data *data;
};
@ -472,7 +501,16 @@ struct elf_state {
int fd;
const void *obj_buf;
size_t obj_buf_sz;
#if defined HAVE_LIBELF
Elf *elf;
#elif defined HAVE_ELFIO
pelfio_t elf;
Elf64_Ehdr eheader;
pstring_t shstring;
pstring_t strstring;
Elf_Data realsymbols;
Elf_Data realst_ops_data;
#endif
Elf64_Ehdr *ehdr;
Elf_Data *symbols;
Elf_Data *st_ops_data;
@ -555,11 +593,26 @@ struct bpf_object {
static const char *elf_sym_str(const struct bpf_object *obj, size_t off);
static const char *elf_sec_str(const struct bpf_object *obj, size_t off);
#ifdef HAVE_LIBELF
static Elf_Scn *elf_sec_by_idx(const struct bpf_object *obj, size_t idx);
static Elf_Scn *elf_sec_by_name(const struct bpf_object *obj, const char *name);
#endif
#if defined HAVE_LIBELF
static Elf64_Shdr *elf_sec_hdr(const struct bpf_object *obj, Elf_Scn *scn);
#elif defined HAVE_ELFIO
static Elf64_Shdr *elf_sec_hdr_by_idx(const struct bpf_object *obj, size_t idx, Elf64_Shdr *sheader);
#endif
#if defined HAVE_LIBELF
static const char *elf_sec_name(const struct bpf_object *obj, Elf_Scn *scn);
#elif defined HAVE_ELFIO
static const char *elf_sec_name_by_idx(const struct bpf_object *obj, size_t idx);
#endif
#if defined HAVE_LIBELF
static Elf_Data *elf_sec_data(const struct bpf_object *obj, Elf_Scn *scn);
#elif defined HAVE_ELFIO
static Elf_Data *elf_sec_data_by_name(const struct bpf_object *obj, const char *name, Elf_Data *data);
static Elf_Data *elf_sec_data_by_idx(const struct bpf_object *obj, size_t idx, Elf_Data *data);
#endif
static Elf64_Sym *elf_sym_by_idx(const struct bpf_object *obj, size_t idx);
static Elf64_Rel *elf_rel_by_idx(Elf_Data *data, size_t idx);
@ -1224,7 +1277,17 @@ static void bpf_object__elf_finish(struct bpf_object *obj)
return;
if (obj->efile.elf) {
#if defined HAVE_LIBELF
elf_end(obj->efile.elf);
#elif defined HAVE_ELFIO
if (obj->efile.shstring) {
elfio_string_section_accessor_delete(obj->efile.shstring);
}
if (obj->efile.strstring) {
elfio_string_section_accessor_delete(obj->efile.strstring);
}
elfio_delete(obj->efile.elf);
#endif
obj->efile.elf = NULL;
}
obj->efile.symbols = NULL;
@ -1241,7 +1304,11 @@ static int bpf_object__elf_init(struct bpf_object *obj)
{
Elf64_Ehdr *ehdr;
int err = 0;
#ifdef HAVE_LIBELF
Elf *elf;
#elif defined HAVE_ELFIO
pelfio_t elf;
#endif
if (obj->efile.elf) {
pr_warn("elf: init internal error\n");
@ -1253,7 +1320,17 @@ static int bpf_object__elf_init(struct bpf_object *obj)
* obj_buf should have been validated by
* bpf_object__open_buffer().
*/
#ifdef HAVE_LIBELF
elf = elf_memory((char *)obj->efile.obj_buf, obj->efile.obj_buf_sz);
#elif defined HAVE_ELFIO
char memfd_path[PATH_MAX] = {0};
elf = elfio_new();
int fdm = syscall(__NR_memfd_create, "bpfelf", MFD_CLOEXEC);
ftruncate(fdm, obj->efile.obj_buf_sz);
write(fdm, (char *)obj->efile.obj_buf, obj->efile.obj_buf_sz);
snprintf(memfd_path, PATH_MAX, "/proc/self/fd/%d", fdm);
elfio_load(elf, memfd_path);
#endif
} else {
obj->efile.fd = open(obj->path, O_RDONLY | O_CLOEXEC);
if (obj->efile.fd < 0) {
@ -1265,7 +1342,9 @@ static int bpf_object__elf_init(struct bpf_object *obj)
return err;
}
#ifdef HAVE_LIBELF
elf = elf_begin(obj->efile.fd, ELF_C_READ_MMAP, NULL);
#endif
}
if (!elf) {
@ -1276,6 +1355,7 @@ static int bpf_object__elf_init(struct bpf_object *obj)
obj->efile.elf = elf;
#ifdef HAVE_LIBELF
if (elf_kind(elf) != ELF_K_ELF) {
err = -LIBBPF_ERRNO__FORMAT;
pr_warn("elf: '%s' is not a proper ELF object\n", obj->path);
@ -1283,18 +1363,26 @@ static int bpf_object__elf_init(struct bpf_object *obj)
}
if (gelf_getclass(elf) != ELFCLASS64) {
#elif defined HAVE_ELFIO
if (elfio_get_class(elf) != ELFCLASS64 ) {
#endif
err = -LIBBPF_ERRNO__FORMAT;
pr_warn("elf: '%s' is not a 64-bit ELF object\n", obj->path);
goto errout;
}
#ifdef HAVE_LIBELF
obj->efile.ehdr = ehdr = elf64_getehdr(elf);
#elif defined HAVE_ELFIO
obj->efile.ehdr = ehdr = (Elf64_Ehdr*)obj->efile.obj_buf;
#endif
if (!obj->efile.ehdr) {
pr_warn("elf: failed to get ELF header from %s: %s\n", obj->path, elf_errmsg(-1));
err = -LIBBPF_ERRNO__FORMAT;
goto errout;
}
#ifdef HAVE_LIBELF
if (elf_getshdrstrndx(elf, &obj->efile.shstrndx)) {
pr_warn("elf: failed to get section names section index for %s: %s\n",
obj->path, elf_errmsg(-1));
@ -1309,6 +1397,9 @@ static int bpf_object__elf_init(struct bpf_object *obj)
err = -LIBBPF_ERRNO__FORMAT;
goto errout;
}
#elif defined HAVE_ELFIO
obj->efile.shstrndx = elfio_get_section_name_str_index(elf);
#endif
/* Old LLVM set e_machine to EM_NONE */
if (ehdr->e_type != ET_REL || (ehdr->e_machine && ehdr->e_machine != EM_BPF)) {
@ -1376,14 +1467,22 @@ static int find_elf_sec_sz(const struct bpf_object *obj, const char *name, __u32
{
int ret = -ENOENT;
Elf_Data *data;
#ifdef HAVE_LIBELF
Elf_Scn *scn;
#endif
*size = 0;
if (!name)
return -EINVAL;
#if defined HAVE_LIBELF
scn = elf_sec_by_name(obj, name);
data = elf_sec_data(obj, scn);
#elif defined HAVE_ELFIO
Elf_Data realdata;
data = &realdata;
data = elf_sec_data_by_name(obj, name, data);
#endif
if (data) {
ret = 0; /* found it */
*size = data->d_size;
@ -1592,7 +1691,11 @@ static int bpf_object__init_global_data_maps(struct bpf_object *obj)
switch (sec_desc->sec_type) {
case SEC_DATA:
#if defined HAVE_LIBELF
sec_name = elf_sec_name(obj, elf_sec_by_idx(obj, sec_idx));
#elif defined HAVE_ELFIO
sec_name = elf_sec_name_by_idx(obj, sec_idx);
#endif
err = bpf_object__init_internal_map(obj, LIBBPF_MAP_DATA,
sec_name, sec_idx,
sec_desc->data->d_buf,
@ -1600,14 +1703,22 @@ static int bpf_object__init_global_data_maps(struct bpf_object *obj)
break;
case SEC_RODATA:
obj->has_rodata = true;
#if defined HAVE_LIBELF
sec_name = elf_sec_name(obj, elf_sec_by_idx(obj, sec_idx));
#elif defined HAVE_ELFIO
sec_name = elf_sec_name_by_idx(obj, sec_idx);
#endif
err = bpf_object__init_internal_map(obj, LIBBPF_MAP_RODATA,
sec_name, sec_idx,
sec_desc->data->d_buf,
sec_desc->data->d_size);
break;
case SEC_BSS:
#if defined HAVE_LIBELF
sec_name = elf_sec_name(obj, elf_sec_by_idx(obj, sec_idx));
#elif defined HAVE_ELFIO
sec_name = elf_sec_name_by_idx(obj, sec_idx);
#endif
err = bpf_object__init_internal_map(obj, LIBBPF_MAP_BSS,
sec_name, sec_idx,
NULL,
@ -1928,7 +2039,9 @@ static int bpf_object__init_user_maps(struct bpf_object *obj, bool strict)
Elf_Data *symbols = obj->efile.symbols;
int i, map_def_sz = 0, nr_maps = 0, nr_syms;
Elf_Data *data = NULL;
#ifdef HAVE_LIBELF
Elf_Scn *scn;
#endif
if (obj->efile.maps_shndx < 0)
return 0;
@ -1941,9 +2054,19 @@ static int bpf_object__init_user_maps(struct bpf_object *obj, bool strict)
if (!symbols)
return -EINVAL;
#if defined HAVE_LIBELF
scn = elf_sec_by_idx(obj, obj->efile.maps_shndx);
data = elf_sec_data(obj, scn);
#elif defined HAVE_ELFIO
Elf_Data realdata;
data = elf_sec_data_by_idx(obj, obj->efile.maps_shndx, &realdata);
#endif
#if defined HAVE_LIBELF
if (!scn || !data) {
#elif defined HAVE_ELFIO
if (!data) {
#endif
pr_warn("elf: failed to get legacy map definitions for %s\n",
obj->path);
return -EINVAL;
@ -2552,14 +2675,22 @@ static int bpf_object__init_user_btf_maps(struct bpf_object *obj, bool strict,
const struct btf_type *t;
const char *name;
Elf_Data *data;
#ifdef HAVE_LIBELF
Elf_Scn *scn;
#endif
if (obj->efile.btf_maps_shndx < 0)
return 0;
#if defined HAVE_LIBELF
scn = elf_sec_by_idx(obj, obj->efile.btf_maps_shndx);
data = elf_sec_data(obj, scn);
if (!scn || !data) {
#elif defined HAVE_ELFIO
Elf_Data realdata;
data = elf_sec_data_by_idx(obj, obj->efile.btf_maps_shndx, &realdata);
if (!data) {
#endif
pr_warn("elf: failed to get %s map definitions for %s\n",
MAPS_ELF_SEC, obj->path);
return -EINVAL;
@ -2619,7 +2750,12 @@ static bool section_have_execinstr(struct bpf_object *obj, int idx)
{
Elf64_Shdr *sh;
#if defined HAVE_LIBELF
sh = elf_sec_hdr(obj, elf_sec_by_idx(obj, idx));
#elif defined HAVE_ELFIO
Elf64_Shdr header;
sh = elf_sec_hdr_by_idx(obj, idx, &header);
#endif
if (!sh)
return false;
@ -3051,7 +3187,11 @@ static const char *elf_sym_str(const struct bpf_object *obj, size_t off)
{
const char *name;
#if defined HAVE_LIBELF
name = elf_strptr(obj->efile.elf, obj->efile.strtabidx, off);
#elif defined HAVE_ELFIO
name = elfio_string_get_string(obj->efile.strstring, off);
#endif
if (!name) {
pr_warn("elf: failed to get section name string at offset %zu from %s: %s\n",
off, obj->path, elf_errmsg(-1));
@ -3065,7 +3205,11 @@ static const char *elf_sec_str(const struct bpf_object *obj, size_t off)
{
const char *name;
#if defined HAVE_LIBELF
name = elf_strptr(obj->efile.elf, obj->efile.shstrndx, off);
#elif defined HAVE_ELFIO
name = elfio_string_get_string(obj->efile.shstring, off);
#endif
if (!name) {
pr_warn("elf: failed to get section name string at offset %zu from %s: %s\n",
off, obj->path, elf_errmsg(-1));
@ -3075,6 +3219,7 @@ static const char *elf_sec_str(const struct bpf_object *obj, size_t off)
return name;
}
#ifdef HAVE_LIBELF
static Elf_Scn *elf_sec_by_idx(const struct bpf_object *obj, size_t idx)
{
Elf_Scn *scn;
@ -3146,6 +3291,44 @@ static const char *elf_sec_name(const struct bpf_object *obj, Elf_Scn *scn)
return name;
}
#elif defined HAVE_ELFIO
static Elf64_Shdr *elf_sec_hdr_by_idx(const struct bpf_object *obj, size_t idx, Elf64_Shdr *sheader)
{
psection_t psection = elfio_get_section_by_index(obj->efile.elf, idx);
sheader->sh_name = elfio_section_get_name_string_offset(psection);
sheader->sh_type = elfio_section_get_type(psection);
sheader->sh_flags = elfio_section_get_flags(psection);
sheader->sh_addr = elfio_section_get_address(psection);
sheader->sh_offset = elfio_section_get_offset(psection);
sheader->sh_size = elfio_section_get_size(psection);
sheader->sh_link = elfio_section_get_link(psection);
sheader->sh_info = elfio_section_get_info(psection);
sheader->sh_addralign = elfio_section_get_addr_align(psection);
sheader->sh_entsize = elfio_section_get_entry_size(psection);
return sheader;
}
static const char *elf_sec_name_by_idx(const struct bpf_object *obj, size_t idx)
{
const char *name;
Elf64_Shdr sh;
elf_sec_hdr_by_idx(obj, idx, &sh);
name = elf_sec_str(obj, sh.sh_name);
if (!name) {
pr_warn("elf: failed to get section(%zu) name from %s: %s\n",
idx, obj->path, elf_errmsg(-1));
return NULL;
}
return name;
}
#endif
#if defined HAVE_LIBELF
static Elf_Data *elf_sec_data(const struct bpf_object *obj, Elf_Scn *scn)
{
Elf_Data *data;
@ -3164,6 +3347,28 @@ static Elf_Data *elf_sec_data(const struct bpf_object *obj, Elf_Scn *scn)
return data;
}
#elif defined HAVE_ELFIO
static Elf_Data *elf_sec_data_by_name(const struct bpf_object *obj, const char *name, Elf_Data *data)
{
pelfio_t elf = obj->efile.elf;
psection_t psection_name = elfio_get_section_by_name(elf, name);
data->d_buf = (void*)elfio_section_get_data(psection_name);
data->d_size = elfio_section_get_size(psection_name);
return data;
}
static Elf_Data *elf_sec_data_by_idx(const struct bpf_object *obj, size_t idx, Elf_Data *data)
{
pelfio_t elf = obj->efile.elf;
psection_t psection_index = elfio_get_section_by_index(elf, idx);
data->d_buf = (void*)elfio_section_get_data(psection_index);
data->d_size = elfio_section_get_size(psection_index);
return data;
}
#endif
static Elf64_Sym *elf_sym_by_idx(const struct bpf_object *obj, size_t idx)
{
if (idx >= obj->efile.symbols->d_size / sizeof(Elf64_Sym))
@ -3235,14 +3440,24 @@ static int cmp_progs(const void *_a, const void *_b)
static int bpf_object__elf_collect(struct bpf_object *obj)
{
struct elf_sec_desc *sec_desc;
#if defined HAVE_LIBELF
Elf *elf = obj->efile.elf;
#elif defined HAVE_ELFIO
pelfio_t elf = obj->efile.elf;
#endif
Elf_Data *btf_ext_data = NULL;
Elf_Data *btf_data = NULL;
int idx = 0, err = 0;
const char *name;
Elf_Data *data;
#ifdef HAVE_LIBELF
Elf_Scn *scn;
#endif
Elf64_Shdr *sh;
#ifdef HAVE_ELFIO
Elf64_Shdr secHeader = {0};
sh = &secHeader;
#endif
/* ELF section indices are 0-based, but sec #0 is special "invalid"
* section. e_shnum does include sec #0, so e_shnum is the necessary
@ -3256,9 +3471,16 @@ static int bpf_object__elf_collect(struct bpf_object *obj)
/* a bunch of ELF parsing functionality depends on processing symbols,
* so do the first pass and find the symbol table
*/
#if defined HAVE_LIBELF
scn = NULL;
while ((scn = elf_nextscn(elf, scn)) != NULL) {
sh = elf_sec_hdr(obj, scn);
#elif defined HAVE_ELFIO
int secno = elfio_get_sections_num(elf);
for ( int i = 0; i < secno; i++ ) {
Elf_Data realdata;
sh = elf_sec_hdr_by_idx(obj, i, sh);
#endif
if (!sh)
return -LIBBPF_ERRNO__FORMAT;
@ -3268,30 +3490,83 @@ static int bpf_object__elf_collect(struct bpf_object *obj)
return -LIBBPF_ERRNO__FORMAT;
}
#if defined HAVE_LIBELF
data = elf_sec_data(obj, scn);
#elif defined HAVE_ELFIO
data = elf_sec_data_by_idx(obj, i, &realdata);
#endif
if (!data)
return -LIBBPF_ERRNO__FORMAT;
#ifdef HAVE_LIBELF
idx = elf_ndxscn(scn);
#endif
#if defined HAVE_LIBELF
obj->efile.symbols = data;
#elif defined HAVE_ELFIO
obj->efile.realsymbols.d_buf = data->d_buf;
obj->efile.realsymbols.d_size = data->d_size;
obj->efile.symbols = &(obj->efile.realsymbols);
#endif
#if defined HAVE_LIBELF
obj->efile.symbols_shndx = idx;
#elif defined HAVE_ELFIO
obj->efile.symbols_shndx = i;
#endif
obj->efile.strtabidx = sh->sh_link;
}
}
#ifdef HAVE_ELFIO
pstring_t shstring;
pstring_t strstring;
psection_t psection = elfio_get_section_by_index(elf, obj->efile.strtabidx);
if (!psection)
return -LIBBPF_ERRNO__FORMAT;
strstring = elfio_string_section_accessor_new(psection);
psection = elfio_get_section_by_index(elf, obj->efile.shstrndx);
if (!psection)
return -LIBBPF_ERRNO__FORMAT;
shstring = elfio_string_section_accessor_new(psection);
if (!strstring || !shstring)
return -LIBBPF_ERRNO__FORMAT;
obj->efile.strstring = strstring;
obj->efile.shstring = shstring;
#endif
if (!obj->efile.symbols) {
pr_warn("elf: couldn't find symbol table in %s, stripped object file?\n",
obj->path);
return -ENOENT;
}
#ifdef HAVE_LIBELF
scn = NULL;
while ((scn = elf_nextscn(elf, scn)) != NULL) {
#elif defined HAVE_ELFIO
for ( int i = 0; i < secno; i++ ) {
psection_t ptmpsection = elfio_get_section_by_index(elf, i);
elf_sec_hdr_by_idx(obj, i, sh);
#endif
#if defined HAVE_LIBELF
idx = elf_ndxscn(scn);
#elif defined HAVE_ELFIO
idx = i;
#endif
sec_desc = &obj->efile.secs[idx];
#if defined HAVE_LIBELF
sh = elf_sec_hdr(obj, scn);
#elif defined HAVE_ELFIO
sh = elf_sec_hdr_by_idx(obj, i, sh);
#endif
if (!sh)
return -LIBBPF_ERRNO__FORMAT;
@ -3302,7 +3577,11 @@ static int bpf_object__elf_collect(struct bpf_object *obj)
if (ignore_elf_section(sh, name))
continue;
#if defined HAVE_LIBELF
data = elf_sec_data(obj, scn);
#elif defined HAVE_ELFIO
data = elf_sec_data_by_idx(obj, i, &sec_desc->realdata);
#endif
if (!data)
return -LIBBPF_ERRNO__FORMAT;
@ -3343,15 +3622,37 @@ static int bpf_object__elf_collect(struct bpf_object *obj)
} else if (strcmp(name, DATA_SEC) == 0 ||
str_has_pfx(name, DATA_SEC ".")) {
sec_desc->sec_type = SEC_DATA;
#if defined HAVE_LIBELF
sec_desc->shdr = sh;
sec_desc->data = data;
#elif defined HAVE_ELFIO
sec_desc->psection = ptmpsection;
sec_desc->realdata.d_buf = data->d_buf;
sec_desc->realdata.d_size = data->d_size;
sec_desc->data = &(sec_desc->realdata);
#endif
} else if (strcmp(name, RODATA_SEC) == 0 ||
str_has_pfx(name, RODATA_SEC ".")) {
sec_desc->sec_type = SEC_RODATA;
#if defined HAVE_LIBELF
sec_desc->shdr = sh;
sec_desc->data = data;
#elif defined HAVE_ELFIO
sec_desc->psection = ptmpsection;
sec_desc->realdata.d_buf = data->d_buf;
sec_desc->realdata.d_size = data->d_size;
sec_desc->data = &(sec_desc->realdata);
#endif
} else if (strcmp(name, STRUCT_OPS_SEC) == 0) {
#if defined HAVE_LIBELF
obj->efile.st_ops_data = data;
#elif defined HAVE_ELFIO
obj->efile.realst_ops_data.d_buf = data->d_buf;
obj->efile.realst_ops_data.d_size = data->d_size;
obj->efile.st_ops_data = &(obj->efile.realst_ops_data);
#endif
obj->efile.st_ops_shndx = idx;
} else {
pr_info("elf: skipping unrecognized data section(%d) %s\n",
@ -3368,18 +3669,32 @@ static int bpf_object__elf_collect(struct bpf_object *obj)
if (!section_have_execinstr(obj, targ_sec_idx) &&
strcmp(name, ".rel" STRUCT_OPS_SEC) &&
strcmp(name, ".rel" MAPS_ELF_SEC)) {
#if defined HAVE_LIBELF
pr_info("elf: skipping relo section(%d) %s for section(%d) %s\n",
idx, name, targ_sec_idx,
elf_sec_name(obj, elf_sec_by_idx(obj, targ_sec_idx)) ?: "<?>");
#elif defined HAVE_ELFIO
pr_info("elf: skipping relo section(%d) %s for section(%d) %s\n",
idx, name, targ_sec_idx,
elf_sec_name_by_idx(obj, targ_sec_idx) ?: "<?>");
#endif
continue;
}
sec_desc->sec_type = SEC_RELO;
#if defined HAVE_LIBELF
sec_desc->shdr = sh;
#elif defined HAVE_ELFIO
sec_desc->psection = ptmpsection;
#endif
sec_desc->data = data;
} else if (sh->sh_type == SHT_NOBITS && strcmp(name, BSS_SEC) == 0) {
sec_desc->sec_type = SEC_BSS;
#if defined HAVE_LIBELF
sec_desc->shdr = sh;
#elif defined HAVE_ELFIO
sec_desc->psection = ptmpsection;
#endif
sec_desc->data = data;
} else {
pr_info("elf: skipping section(%d) %s (size %zu)\n", idx, name,
@ -3609,14 +3924,22 @@ static int bpf_object__collect_externs(struct bpf_object *obj)
struct extern_desc *ext;
int i, n, off, dummy_var_btf_id;
const char *ext_name, *sec_name;
#ifdef HAVE_LIBELF
Elf_Scn *scn;
#endif
Elf64_Shdr *sh;
Elf64_Shdr shheader;
if (!obj->efile.symbols)
return 0;
#if defined HAVE_LIBELF
scn = elf_sec_by_idx(obj, obj->efile.symbols_shndx);
sh = elf_sec_hdr(obj, scn);
#elif defined HAVE_ELFIO
sh = &shheader;
sh = elf_sec_hdr_by_idx(obj, obj->efile.symbols_shndx, sh);
#endif
if (!sh || sh->sh_entsize != sizeof(Elf64_Sym))
return -LIBBPF_ERRNO__FORMAT;
@ -3949,7 +4272,11 @@ static int bpf_program__record_reloc(struct bpf_program *prog,
}
/* text_shndx can be 0, if no default "main" program exists */
if (!shdr_idx || shdr_idx != obj->efile.text_shndx) {
#if defined HAVE_LIBELF
sym_sec_name = elf_sec_name(obj, elf_sec_by_idx(obj, shdr_idx));
#elif defined HAVE_ELFIO
sym_sec_name = elf_sec_name_by_idx(obj, shdr_idx);
#endif
pr_warn("prog '%s': bad call relo against '%s' in section '%s'\n",
prog->name, sym_name, sym_sec_name);
return -LIBBPF_ERRNO__RELOC;
@ -3989,7 +4316,11 @@ static int bpf_program__record_reloc(struct bpf_program *prog,
}
type = bpf_object__section_to_libbpf_map_type(obj, shdr_idx);
#if defined HAVE_LIBELF
sym_sec_name = elf_sec_name(obj, elf_sec_by_idx(obj, shdr_idx));
#elif defined HAVE_ELFIO
sym_sec_name = elf_sec_name_by_idx(obj, shdr_idx);
#endif
/* generic map reference relocation */
if (type == LIBBPF_MAP_UNSPEC) {
@ -4090,7 +4421,9 @@ bpf_object__collect_prog_relos(struct bpf_object *obj, Elf64_Shdr *shdr, Elf_Dat
int err, i, nrels;
const char *sym_name;
__u32 insn_idx;
#ifdef HAVE_LIBELF
Elf_Scn *scn;
#endif
Elf_Data *scn_data;
Elf64_Sym *sym;
Elf64_Rel *rel;
@ -4098,6 +4431,7 @@ bpf_object__collect_prog_relos(struct bpf_object *obj, Elf64_Shdr *shdr, Elf_Dat
if (sec_idx >= obj->efile.sec_cnt)
return -EINVAL;
#if defined HAVE_LIBELF
scn = elf_sec_by_idx(obj, sec_idx);
scn_data = elf_sec_data(obj, scn);
@ -4105,6 +4439,15 @@ bpf_object__collect_prog_relos(struct bpf_object *obj, Elf64_Shdr *shdr, Elf_Dat
sec_name = elf_sec_name(obj, scn);
if (!relo_sec_name || !sec_name)
return -EINVAL;
#elif defined HAVE_ELFIO
Elf_Data realdata;
scn_data = elf_sec_data_by_idx(obj, sec_idx, &realdata);
relo_sec_name = elf_sec_str(obj, shdr->sh_name);
sec_name = elf_sec_name_by_idx(obj, sec_idx);
if (!relo_sec_name || !sec_name)
return -EINVAL;
#endif
pr_debug("sec '%s': collecting relocation for section(%zu) '%s'\n",
relo_sec_name, sec_idx, sec_name);
@ -4145,7 +4488,11 @@ bpf_object__collect_prog_relos(struct bpf_object *obj, Elf64_Shdr *shdr, Elf_Dat
* instead
*/
if (ELF64_ST_TYPE(sym->st_info) == STT_SECTION && sym->st_name == 0)
#if defined HAVE_LIBELF
sym_name = elf_sec_name(obj, elf_sec_by_idx(obj, sym->st_shndx));
#elif defined HAVE_ELFIO
sym_name = elf_sec_name_by_idx(obj, sym->st_shndx);
#endif
else
sym_name = elf_sym_str(obj, sym->st_name);
sym_name = sym_name ?: "<?";
@ -5611,7 +5958,9 @@ bpf_object__relocate_core(struct bpf_object *obj, const char *targ_btf_path)
return 0;
if (targ_btf_path) {
#ifdef HAVE_LIBELF
obj->btf_vmlinux_override = btf__parse(targ_btf_path, NULL);
#endif
err = libbpf_get_error(obj->btf_vmlinux_override);
if (err) {
pr_warn("failed to parse target BTF: %d\n", err);
@ -6478,11 +6827,16 @@ static int bpf_object__collect_relos(struct bpf_object *obj)
Elf64_Shdr *shdr;
Elf_Data *data;
int idx;
Elf64_Shdr shdrelf;
if (sec_desc->sec_type != SEC_RELO)
continue;
#if defined HAVE_LIBELF
shdr = sec_desc->shdr;
#elif defined HAVE_ELFIO
shdr = elf_sec_hdr_by_idx(obj, i, &shdrelf);
#endif
data = sec_desc->data;
idx = shdr->sh_info;
@ -6979,11 +7333,13 @@ static struct bpf_object *bpf_object_open(const char *path, const void *obj_buf,
size_t log_size;
__u32 log_level;
#ifdef HAVE_LIBELF
if (elf_version(EV_CURRENT) == EV_NONE) {
pr_warn("failed to init libelf for %s\n",
path ? : "(mem buf)");
return ERR_PTR(-LIBBPF_ERRNO__LIBELF);
}
#endif
if (!OPTS_VALID(opts, bpf_object_open_opts))
return ERR_PTR(-EINVAL);