How to Debug native code using ndk-gdb
13,654
Solution 1
The commands are the same as in gdb. A basic primer:
- Set a breakpoint by entering
b <function name>
orb <file>:<line number>
- step into functions by typing
s
- go to next line by typing
n
- continue execution with
c
- print a variable or expression value with
print <exp>
- repeat the last typed command by just hitting enter
You can find much more comprehensive gdb tutorials online. I personally have a gdb cheatsheet printed out and posted on my wall. This should be enough to get you started.
Solution 2
this tutorial will show you exactly how to debugging with ndk-gdb in eclipse.
Author by
DeltaCap019
Updated on June 04, 2022Comments
-
DeltaCap019 almost 2 years
This is what I am getting after running
ndk-gdb
according to many tutorials when it links to you to(gdb)
server you have to typecontinue
but what after that how to debug the code there after. In my case it displaysContinuing
and remain like this. WHat i have to do further I am totally clueless.Arathore@chd-arathore-AND /cygdrive/d/All_Work/All_ARathore/All_Workspace_Practice/ndkfoo $ /cygdrive/d/All_Required_Stuff/Android/android-ndk-r8e/ndk-gdb --verbose --adb=/cygdrive/D/All_Required_Stuff/Android/android-sdk-windows/platform-tools/adb.exe Android NDK installation path: /cygdrive/d/All_Required_Stuff/Android/android-ndk-r8e Using specific adb command: /cygdrive/D/All_Required_Stuff/Android/android-sdk-windows/platform-tools/adb.exe ADB version found: Android Debug Bridge version 1.0.31 Using ADB flags: Using auto-detected project path: . Found package name: com.example.ndkfoo /cygdrive/d/All_Required_Stuff/Android/android-ndk-r8e/build/core/add-application.mk:128: Android NDK: WARNING: APP_PLATFORM android-14 is larger than android:minSdkVersion 8 in /cygdrive/d/All_Work/All_ARathore/All_Workspace_Practice/ndkfoo/AndroidManifest.xml ABIs targetted by application: armeabi Device API Level: 17 Device CPU ABIs: armeabi-v7a armeabi Compatible device ABI: armeabi /cygdrive/d/All_Required_Stuff/Android/android-ndk-r8e/build/core/add-application.mk:128: Android NDK: WARNING: APP_PLATFORM android-14 is larger than android:minSdkVersion 8 in /cygdrive/d/All_Work/All_ARathore/All_Workspace_Practice/ndkfoo/AndroidManifest.xml Using gdb setup init: /cygdrive/d/All_Work/All_ARathore/All_Workspace_Practice/ndkfoo/libs/armeabi/gdb.setup /cygdrive/d/All_Required_Stuff/Android/android-ndk-r8e/build/core/add-application.mk:128: Android NDK: WARNING: APP_PLATFORM android-14 is larger than android:minSdkVersion 8 in /cygdrive/d/All_Work/All_ARathore/All_Workspace_Practice/ndkfoo/AndroidManifest.xml Using toolchain prefix: /cygdrive/d/All_Required_Stuff/Android/android-ndk-r8e/toolchains/arm-linux-androideabi-4.6/prebuilt/windows/bin/arm-linux-androideabi- /cygdrive/d/All_Required_Stuff/Android/android-ndk-r8e/build/core/add-application.mk:128: Android NDK: WARNING: APP_PLATFORM android-14 is larger than android:minSdkVersion 8 in /cygdrive/d/All_Work/All_ARathore/All_Workspace_Practice/ndkfoo/AndroidManifest.xml Using app out directory: ./obj/local/armeabi Found debuggable flag: true Found device gdbserver: /data/data/com.example.ndkfoo/lib/gdbserver Found data directory: '/data/data/com.example.ndkfoo' Found running PID: 1106 Launched gdbserver succesfully. Setup network redirection ## COMMAND: adb_cmd shell run-as com.example.ndkfoo lib/gdbserver +debug-socket --attach 1106 ## COMMAND: adb_cmd forward tcp:5039 localfilesystem:/data/data/com.example.ndkfoo/debug-socket ## COMMAND: adb_cmd pull /system/bin/app_process obj/local/armeabi/app_process Attached; pid = 1106 Listening on Unix socket debug-socket 99 KB/s (9592 bytes in 0.093s) Pulled app_process from device/emulator. ## COMMAND: adb_cmd pull /system/bin/linker obj/local/armeabi/linker 54 KB/s (63240 bytes in 1.140s) Pulled linker from device/emulator. ## COMMAND: adb_cmd pull /system/lib/libc.so obj/local/armeabi/libc.so 75 KB/s (297604 bytes in 3.828s) Pulled libc.so from device/emulator. GNU gdb (GDB) 7.3.1-gg2 Copyright (C) 2011 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "--host=i586-pc-mingw32msvc --target=arm-linux-android". For bug reporting instructions, please see: <http://source.android.com/source/report-bugs.html>. Remote debugging from host 0.0.0.0 libthread_db:td_ta_new: Probing system for platform bug. libthread_db:_get_task_permitted_caps: Found CapPerm of 0 in /proc/1147/task/1147/status libthread_db:_get_task_permitted_caps: Found CapPerm of 0 in /proc/1106/task/1106/status libthread_db:_get_task_permitted_caps: Found CapPerm of 0 in /proc/1106/task/1109/status libthread_db:_get_task_permitted_caps: Found CapPerm of 0 in /proc/1106/task/1111/status libthread_db:_get_task_permitted_caps: Found CapPerm of 0 in /proc/1106/task/1112/status libthread_db:_get_task_permitted_caps: Found CapPerm of 0 in /proc/1106/task/1113/status libthread_db:_get_task_permitted_caps: Found CapPerm of 0 in /proc/1106/task/1114/status libthread_db:_get_task_permitted_caps: Found CapPerm of 0 in /proc/1106/task/1115/status libthread_db:_get_task_permitted_caps: Found CapPerm of 0 in /proc/1106/task/1116/status libthread_db:_get_task_permitted_caps: Found CapPerm of 0 in /proc/1106/task/1117/status libthread_db:_get_task_permitted_caps: Found CapPerm of 0 in /proc/1106/task/1118/status libthread_db:td_ta_new: Victory: We can debug theads! 0x40037ebc in epoll_wait () from D:/All_Work/All_ARathore/All_Workspace_Practice/ndkfoo/obj/local/armeabi/libc.so warning: Could not load shared library symbols for 72 libraries, e.g. libstdc++.so. Use the "info sharedlibrary" command to see the complete listing. Do you need "set solib-search-path" or "set sysroot"? warning: Breakpoint address adjusted from 0x40005a53 to 0x40005a52. (gdb) continue Continuing.
How to debug?
According to the
ndk-Docs
You can set breakpoints with 'b <location>' and resume execution with 'c' (for 'continue'). See the GDB manual for a list of commands.
How to make this happen.