iOS 64位程序调试环境搭建

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| ### 一、背景调试ios程序经常使用gdb，但是gdb还未支持arm64，需要使用XCode的lldb调试IOS下64位程序。因为xcode默认调试工具是lldb，开始各种尝试在xcode中使用Debug-》Attach to Process 直接attach进程，但是只能看见进程却无法挂接。最终发现可以使用lldb命令行方式调试，lldb调试方法跟gdb最大的不同，在于前者是用OSX中的lldb远程连接debugserver，由debugserver作为lldb和iOS的中转，执行命令和返回结果；而后者是gdb直接运行在iOS上。但对于一般的开发、调试来说，区别不大。 ### 二、基本知识首先了解下各个iphone对应的cpu类型，这些知识将在调试准备工作中用到： |-------------------------------|--------| | 设备 | Cpu类型 | | iPhone 4 | armv7 | | iPhone 4s | armv7 | | iPhone 5 | armv7s | | iPhone 5c | armv7s | | iPhone 5s | armv64 | | iPhone 6 | armv64 | | iPhone 6 Plus | armv64 | | iPad 2 | armv7 | | iPad mini | armv7 | | iPad with Retina display | armv7s | | iPad Air | armv64 | | iPad Air 2 | armv64 | | iPad mini with Retina display | armv64 | | iPad mini 2 | armv64 | | iPad mini 3 | armv64 | | iPad touch 5 | armvv7 | ### 三、lldb调试 #### 3.1 准备工作 #### 使用lldb调试需要准备服务端程序，即debugserver。在默认情况下，iOS上并没有安装debugserver，只有在设备连接过一次Xcode，并在Window-》Devices菜单中添加此设备后，debugserver才会被Xcode安装到iOS的"/Developer/usr/bin/"目录下。确定有了debugserver后再一次执行以下步骤： #### 1、拷贝debugserver到本地计算机中： scp root@iOSDeviceIP:/Developer/usr/bin/debugserver ~/debugserver 2、由于ldid不支持的fat二进制文件，所以要给debugserver瘦身，通过lipo指定要支持的指令类型，以arm64为例： lipo -thin arm64 ~/debugserver -output ~/debugserver 3、给debugserver添加task_for_pid权限，保存以下内容为ent.xml文件： com.apple.springboard.debugapplications get-task-allow task_for_pid-allow run-unsigned-code 然后执行以下命令添加权限： ldid -Sent.xml debugserver 4、给debugserver重新签名，保存以下内容为entitlements.plist文件： com.apple.springboard.debugapplications run-unsigned-code get-task-allow task_for_pid-allow 然后运行以下命令给的debugserver签名： codesign -s - --entitlements entitlements.plist -f debugserver 5、到此准备工作完成，重新拷贝debugserver回手机中： scp ~/debugserver root@iOSDeviceIP:/usr/bin/debugserver #### 3.2 调试利用的lldb调试首先需要的启动debugserver的并，attach到要调试的进程，然后在通过lldb连接debugserver，具体步骤如下： 1、从shell登录ios设备： ssh root@iOSDeviceIP 然后会提示输入root密码，输入即可，如下图所示： 2、如果是第一次使用还需给debugserver添加可执行属性： chmod +x /usr/bin/debugserver 3、接下来直接使用debugserver来attach一个进程，debugserver命令行格式如下： debugserver [] host: [ ...] 其中各个参数选项如下： |-------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | Option | Effect | | -a process | Attach debugserver to process . The process can be a pid or executable name. | | -d integer | Assign the waitfor-duration. | | -f ? | ? | | -g | Turn on debugging. | | -i integer | Assign the waitfor-interval. | | -l filename | Log to file. Set filename to stdout to log to standard output. | | -t | Use task ID instead of process ID. | | -v | Verbose. | | -w ? | ? | | -x method --launch=method | How to launch the program. Can be one of: ·auto: Auto-detect the best launch method to use. ·fork: Launch program using fork(2) and exec(3). ·posix: Launch program using posix_spawn(2). ·backboard: Launch program via BackBoard Services. | | --lockdown | Obtain parameters from lockdown (?) | 其中最常用的参数为-a，后接进程名或进程pid，命令如下： debugserver *:1234 -a "Clover" debugserver *:1234 -a 444 至此ios设备端操作完毕。 4、另打开一个shell，启动lldb客户端，直接输入lldb进入lldb命令行模式。 5、在lldb命令行的连接debugserver： process connect connect://iOSDeviceIP:1234 在我实际使用过程中，此操作需要较长时间，连接成功后如下图所示： 6、接下来就是一系列lldb相关命令操作： ### 四、lldb & gdb命令可能大家使用较多的是gdb，对gdb命令更为熟悉，为了方便大家查阅、对比lldb和gdb命令，罗列出了一些常用命令供大家参考。 EXECUTION COMMANDS |---------------------------|-------------------------------------------------------| | GDB | LLDB | | Launch a process no arguments. || | (gdb) run (gdb) r | (lldb) process launch (lldb) run (lldb) r | | Launch a process with arguments . || | (gdb) run (gdb) r | (lldb) process launch -- (lldb) r | | Launch a process for with arguments a.out 1 2 3 without having to supply the args every time. || |