Android GDB 调试

识字粗堪供赋役，不须辛苦慕公卿。这篇文章主要讲述Android GDB 调试相关的知识，希望能为你提供帮助。
原文地址:https://github.com/mapbox/mapbox-gl-native/wiki/Android-debugging-with-remote-GDB android debugging with remote GDB Leith Bade edited this page on Sep 15, 2015 · 17 revisions Pages 18

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Install Android Studio, SDK and NDK, including build tools and platform tools.
Ensure android-sdk/tools and android-sdk/platform-tools are on your PATH
Build the app with: BUILDTYPE=Debug make android
Connect your device via USB
Check you can connect to the device by running adb shell. You should get the terminal from your device.
Exit with exit

Extract system binaries from device(You will need to do this for every device and every Android OS version)

Create a folder to hold the Android system binaries locally e.g. ~/android
cd into the folder
Create a system_lib and vendor_lib folder
cd system_lib
adb pull /system/lib
cd ../vendor_lib
adb pull /vendor/lib. If you get permissions error you will need to get a list of each file and folder in adb shell then copy each file one at a time with adb pull /vendor/lib/file
cd ..
adb pull /system/bin/app_process (or on 64 bit phones adb pull /system/bin/app_process32 and adb pull /system/bin/app_process64)
adb pull /system/bin/linker (and on 64 bit phones adb pull /system/bin/linker64)

Install GDB server

Go to the NDK folder.
Copy gdbserver from android-ndk/prebuilt/android-arm/gdbserver/gdbserver to mapbox-gl-native/android/java/MapboxGLAndroidSDK/src/main/jniLibs/armeabi-v7a/gdbserver.soIMPORTANT it must be renamed a .so file
Build and run the app in Android Studio
Android studio will copy and install the APK with gdbserver in it to your device

Start the app paused

Open the project in Android Studio
Place a breakpoint in Java class NativeMapView constructor on nativeCreate line
Start app with Run -> Debug
Wait for app to start and hit breakpoint
Open up logcat and look for output from app
Note the process ID e.g. in 11-08 19:25:52.957 31834-31834/com.mapbox.mapboxgl.app V/FragmentActivity﹕ onCreate it is 31834

Start gdbserver

Open a terminal
Run adb forward tcp:5039 localfilesystem:/data/data/com.mapbox.mapboxgl.testapp/debug-pipe
Run adb shell run-as com.mapbox.mapboxgl.testapp /data/data/com.mapbox.mapboxgl.testapp/lib/gdbserver.so +debug-pipe --attach 31834. Replace 31834 with the process ID from earlier. (You will need to do this each time you restart the app as the PID will change)

If you get the error `then you have a version of Android not compatible withadb run-as`. See [this page] for information. It appears to affect Android updates in 4.2.2, 4.3, 5.0, 5.1.1. Workaround appears to be to load a fresh image.
You should see:

Attached;
 pid = 31834 Listening on sockaddr socket debug-socket

Leave the terminal open

Start gdb

Open another terminal
Go to the NDK folder android-ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin
On OSX use android-ndk/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin
Run ./arm-linux-androideabi-gdb ~/android/app_process
target remote :5039
In GDB: set solib-search-path ~/android/:~/android/system_lib:~/android/vendor_lib:~/android/vendor_lib/egl:~/path/to/mapbox-gl-native/build/android-arm-v7/Debug/lib.target/
Check that all the debug symbols were loaded with info sharedlibrary
Check each .so has Yes (*) except for the last libmapbox-gl.so which must have only Yes i.e. (no star). If not double check your solib-search-path
b jni.cpp:183 (the first line of nativeCreate)
c
Switch to Android Studio
Click Run -> Resume Program
Switch back to GDB. It should be paused at nativeCreate
GDB now has control, so c will continue execution (set breakpoints first) Note: If you encounter this crash:

Program received signal SIGILL, Illegal instruction. 0x7956a3a8 in _armv7_tick () from /home/leith/dev/mapbox-gl-native-mason/build/android/out/Debug/lib.target/libmapbox-gl.so (gdb) bt #00x7956a3a8 in _armv7_tick () from /home/leith/dev/mapbox-gl-native-mason/build/android/out/Debug/lib.target/libmapbox-gl.so #10x795d1ccc in OPENSSL_cpuid_setup () from /home/leith/dev/mapbox-gl-native-mason/build/android/out/Debug/lib.target/libmapbox-gl.so #20x400bd9c6 in ?? () from /home/leith/dev/android/linker #30x400bda9e in ?? () from /home/leith/dev/android/linker #40x400bdbf0 in ?? () from /home/leith/dev/android/linker #50x400bdc6e in ?? () from /home/leith/dev/android/linker #60x400bc1a6 in _start () from /home/leith/dev/android/linker #70x41643c86 in dvmLoadNativeCode(char const*, Object*, char**) () from /home/leith/dev/android/system_lib/libdvm.so #80x416600f4 in ?? () from /home/leith/dev/android/system_lib/libdvm.so #90x41613ee8 in dvmJitToInterpNoChain () from /home/leith/dev/android/system_lib/libdvm.so #10 0x41613ee8 in dvmJitToInterpNoChain () from /home/leith/dev/android/system_lib/libdvm.so Backtrace stopped: previous frame identical to this frame (corrupt stack?)

【Android GDB 调试】You just need to c past it to the real crash. From https://bugs.launchpad.net/raspbian/+bug/1154042:

Afaict openssl probes the capabilities of the user‘s CPU by trying to do things and trapping the illegal instruction errors. So a couple of sigills during startup is normal. When using a debugger in order to find the real failure in your application you must continue past the startup sigills. 14. Use GDB commands to debug

Read http://condor.depaul.edu/glancast/373class/docs/gdb.html for GDB commands