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ndk-build-ebpf-example's Introduction

ndk-build-ebpf-example

本项目用于演示如何使用NDK编译一个eBPF程序，主要参考为Android平台编译eBPF程序

步骤

准备工作

先同步需要的源代码，这里选择的是android11-gsi分支，可以根据自己的需求修改

git clone -b android11-gsi https://android.googlesource.com/platform/bionic --depth=1
git clone -b android11-gsi https://android.googlesource.com/platform/system/core --depth=1
git clone -b android11-gsi https://android.googlesource.com/platform/system/bpf --depth=1

整理文件结构

mkdir system && mv core system/ && mv bpf system/

然后准备好NDK，修改build.sh中的NDK_ROOT即可

编译

执行./build.sh即可，产物在out目录下

其他

Q: 和参考文章有什么不同吗？

A: 编译增加了-g选项，作用是生成带有BTF信息的.o文件

https://clang.llvm.org/docs/UsersManual.html#cmdoption-g

如果没有BTF信息，那么加载eBPF程序时会要求内核启用CONFIG_DEBUG_INFO和CONFIG_DEBUG_INFO_BTF，否则无法正确加载

readelf -S out/stack.o | grep BTF

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