[Debug]android_ramdump_tool_crash_introduce

Android查看linux kernel panic issue时，我们需要分析ramdump。

目前我常用的有两种方法来解析ramdump,

-Crash utility

-T32 simulator

我这里介绍crash工具。

Crash utility tool website:

http://people.redhat.com/anderson/

1.Download“crash-7.0.2.tar.gz”

    http://people.redhat.com/anderson/crash-7.0.2.tar.gz

2. To build from the compressed tar image, simply uncompress/extract the sourcefiles,cd into the resultant source directory, and enter make.

3. The command as below:

3.1 >tar xvzmf crash-7.0.2.tar.gz

3.2 >cd ./crash-7.0.2

3.3 >make

       ARM: make target=ARM

3.4 >sudo make install

3.5 >crash –version  //check crash version

4. Analysis Ramdump step.

1) Get System.map

    

2)to get vmcore file(ELF format)

    CMD:  cat  header.bin   ./DDRCS0.BIN >vmcore_test

   Note: here needs header.bin

3)start crash

    CMD: ./crash System.map vmlinux vmcore_test

5. Useful debug command:

set，显示当前发生重大故障时运行进程的上下文。

sf，set scroll off的别名

bt，backtrace

ps，进程，可以查ps | grep ">"

log，显示log

dis ，反汇编

dmesg，同 log

还有很多，如rd，p，mod，sym.....需要自己去摸索。