如何将内核调试信息构建为单独的文件? [英] How to build kernel debug info as separate file?

问题描述

当我们共享定制内核时，通常不提供调试信息.

When we share custom built kernel, It is common to give without debug info.

类似于sudo apt-get install linux-image-$(uname -r)-dbgsym，我想为定制的内核创建单独的调试信息文件.

Similar to sudo apt-get install linux-image-$(uname -r)-dbgsym, I would like to create separate debug info file for custom built kernel.

此处和

Here and here they explained generally. I request to share knowledge on creating separate debug info file for entire linux kernel.

用于示例程序

$ gcc -g calc.c

$ ls -l
 total 16
-rwxrwxr-x 1 jeyaram jeyaram 8424 Apr  8 09:44 a.out
-rw-rw-r-- 1 jeyaram jeyaram  246 Apr  8 09:32 calc.c

$ objcopy --only-keep-debug a.out a.debug
$ gcc calc.c -------------> compiling without debug info (skipped 'strip')
$ ls -l
total 20
-rwxrwxr-x 1 jeyaram jeyaram 4736 Apr  8 09:45 a.debug
-rwxrwxr-x 1 jeyaram jeyaram 7200 Apr  8 09:52 a.out
-rw-rw-r-- 1 jeyaram jeyaram  246 Apr  8 09:32 calc.c

$ objcopy --add-gnu-debuglink=a.debug a.out
$ gdb a.out
GNU gdb (Ubuntu/Linaro 7.4-2012.02-0ubuntu2) 7.4-2012.02
Copyright (C) 2012 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 "i686-linux-gnu".
For bug reporting instructions, please see:
<http://bugs.launchpad.net/gdb-linaro/>...
Reading symbols from /home/jeyaram/JJJ/debug_info_analysis/sample_c_test/a.out...Reading symbols from /home/jeyaram/JJJ/debug_info_analysis/sample_c_test/a.debug...done.
done.

但是在尝试使用vmlinux

But while trying with vmlinux

$ objcopy --only-keep-debug vmlinux vmlinux.debug
objcopy: Unable to recognise the format of the input file `vmlinux'

缺少某些内容???

推荐答案

vmlinux是二进制blob.您要查找的文件是vmlinux.bin(这是elf中间文件).

vmlinux is a binary blob. The file you're looking for is vmlinux.bin (which is the elf intermediate).

像魅力一样工作:

objcopy --only-keep-debug vmlinux.bin vmlinux.debug

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