Question

当我们共享自定义内核时，通常在没有调试信息的情况下提供。

与 sudo apt-get install linux-image - uname -r - dbgsym 类似，我想为自定义内核创建单独的调试信息文件。

他们普遍解释了{p> Here和here。我请求分享有关为整个Linux内核创建单独的调试信息文件的知识。

适用于示例程序

$ 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

时

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

想念什么？

Answer 1

vmlinux是二进制blob。您正在寻找的文件是vmlinux.bin（这是精灵中间人）。

像魅力一样工作：

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

Answer 2

arm-linux-gnueabi-objcopy --only-keep-debug vmlinux vmlinux.debug可以正常使用。

$ ls -l vmlinux*
-rwxrwxr-x 1 jeyaram jeyaram   7871108 Apr  8 11:24 vmlinux
-rwxrwxr-x 1 jeyaram jeyaram  92520922 Apr  8 11:21 vmlinux.debug
-rw-rw-r-- 1 jeyaram jeyaram 162974220 Apr  7 14:16 vmlinux.o

如何将内核调试信息构建为单独的文件？

2 个答案: