Android Debugging - Revision history

Tim Bird at 16:46, 16 May 2012

2012-05-16T16:46:15Z

Tim Bird: /* Kernel and User co-debug with GDB on Android */

2012-05-16T16:45:40Z

‎Kernel and User co-debug with GDB on Android

Tim Bird: /* Kernel and User co-debug with GDB on Android */

2012-05-16T16:43:04Z

‎Kernel and User co-debug with GDB on Android

Tim Bird at 16:42, 16 May 2012

2012-05-16T16:42:43Z

Tim Bird: /* strace */ add link to method tracer stuff

2010-09-20T22:55:05Z

‎strace: add link to method tracer stuff

Tim Bird at 22:52, 20 September 2010

2010-09-20T22:52:34Z

Tim Bird: /* kernel message log */

2010-06-17T22:00:33Z

‎kernel message log

Tim Bird: /* loggers */ add dmesg and init logging

2010-06-17T21:59:32Z

‎loggers: add dmesg and init logging

Tim Bird: add information about Android debugging with strace

2010-06-17T21:49:16Z

add information about Android debugging with strace

New page

Debugging methods for Android

== loggers ==

== tracers ==
=== strace ===
You can use [http://en.wikipedia.org/wiki/Strace strace] on Android. It is included in the
Android open source project (at least as of Android 2.1), and appears to be automatically
installed in engineering builds of the software.

To use strace during early initialization, you can put it in the /init.rc file.
For example, to trace zygote initialization, change the following line in
/init.rc.

service zygote /system/bin/app_process -Xzygote /system/bin --zygote --start-system-server

should be changed to:

service zygote /system/xbin/strace -tt -o/data/boot.strace /system/bin/app_process -Xzygote /system/bin --zygote --start system-server

[[Category:Android]]

@@ Line 1: / Line 1: @@
 Debugging methods for Android
 == loggers ==
@@ Line 46: / Line 54: @@
 See http://developer.android.com/guide/developing/tools/traceview.html
 == Additional Resources ==

← Older revision		Revision as of 16:45, 16 May 2012
Line 47:		Line 47:

	=== Kernel and User co-debug with GDB on Android ===		=== Kernel and User co-debug with GDB on Android ===
		+	This presentation covers lots of Android debug resources provided by Linaro, presented
		+	by Zach Pfeffer in Spring 2012. Included is information about how to debug
		+	kernel and user simultaneously with gdb.
		+
	See [[Media:Zach Pfeffer Next Gen Android 2012.pdf]]		See [[Media:Zach Pfeffer Next Gen Android 2012.pdf]]

@@ Line 47: / Line 47: @@
 === Kernel and User co-debug with GDB on Android ===
-See [[Zach Pfeffer Next Gen Android 2012.pdf]]
+See [[Media:Zach Pfeffer Next Gen Android 2012.pdf]]
 == Additional Resources ==

@@ Line 45: / Line 45: @@
 === Dalvik Method Tracer ===
 See http://developer.android.com/guide/developing/tools/traceview.html
 == Additional Resources ==

← Older revision		Revision as of 22:55, 20 September 2010
Line 42:		Line 42:

	service zygote /system/xbin/strace -tt -o/data/boot.strace /system/bin/app_process -Xzygote /system/bin --zygote --start system-server		service zygote /system/xbin/strace -tt -o/data/boot.strace /system/bin/app_process -Xzygote /system/bin --zygote --start system-server
		+
		+	=== Dalvik Method Tracer ===
		+	See http://developer.android.com/guide/developing/tools/traceview.html

	== Additional Resources ==		== Additional Resources ==

@@ Line 43: / Line 43: @@
   service zygote /system/xbin/strace -tt -o/data/boot.strace /system/bin/app_process -Xzygote /system/bin --zygote --start system-server
+== Additional Resources ==
 [[Category:Android]]

@@ Line 6: / Line 6: @@
 of this log using the [http://en.wikipedia.org/wiki/Dmesg 'dmesg'] command.
-Adding timing information.
+You can add timing information to the printk messages, by adding "time" to the Linux
 ==== init logging ====
@@ Line 17: / Line 18: @@
 to
   loglevel 8
 === Android logging system ===

← Older revision		Revision as of 21:59, 17 June 2010
Line 2:		Line 2:

	== loggers ==		== loggers ==
		+	=== kernel message log ===
		+	The Linux kernel has a message log in an internal ring buffer. You can access the contents
		+	of this log using the [http://en.wikipedia.org/wiki/Dmesg 'dmesg'] command.
		+
		+	Adding timing information.
		+
		+	==== init logging ====
		+	The Android init program outputs some messages to the kernel log, as it starts the system.
		+	You can increase the verbosity of init, using the "loglevel" command in the /init.rc file.
		+
		+	The default loglevel is 3, but you can change it to 8 (the highest) by changing the following
		+	line in the /init.rc file. Change:
		+	loglevel 3
		+	to
		+	loglevel 8
		+
		+
		+	=== Android logging system ===
		+	The Android application framework has a built-in logging system, which goes through a special
		+	driver in the kernel. It is described at:http://developer.android.com/guide/developing/tools/adb.html#logcat
		+
		+	Note that although the log dumper (logcat) is described on the Android developer site on the 'adb' page,
		+	there is a native logcat command included in the Android distribution (that is, available on the target
		+	file system, which can be run locally).

	== tracers ==		== tracers ==