使用gdb調試內核遇到的一些問題

 

1 .  make config的時候報下面的錯誤，意思是變量沒有初始化，手動初始化成’NULL’，就好了。

---

HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/kconfig/conf.o
  SHIPPED scripts/kconfig/zconf.tab.c
  SHIPPED scripts/kconfig/zconf.lex.c
  SHIPPED scripts/kconfig/zconf.hash.c
  HOSTCC  scripts/kconfig/zconf.tab.o
In file included from scripts/kconfig/zconf.tab.c:2537:0:
scripts/kconfig/menu.c: In function ‘get_symbol_str’:
scripts/kconfig/menu.c:590:18: warning: ‘jump’ may be used uninitialized in this function [-Wmaybe-uninitialized]
     jump->offset = strlen(r->s);
     ~~~~~~~~~~~~~^~~~~~~~~~~~~~
scripts/kconfig/menu.c:551:19: note: ‘jump’ was declared here
  struct jump_key *jump;
                   ^~~~
  HOSTLD  scripts/kconfig/conf

2. 如何給upstream內核打patch

xzcat ../patch-4.15.12.xz | patch -p1 –R

3.  內核config

      使用make help 查看可用的config

       make i386_defconfig

      make menuconfig

在原來配置的基礎上，make menuconfig選中如下選項重新配置Linux，使之攜帶調試信息
kernel hacking—>
[*] compile the kernel with debug info
make重新編譯（時間較長）

make clean

make –j 4

 

4. 解決gcc找不到文件的問題

https://blog.csdn.net/u014525494/article/details/53573298

 

5. 關於printk的級別，console最大數字支持15，但是最好不要設置，定位問題可設置爲10

https://blog.csdn.net/weixin_38227420/article/details/79329491

https://www.aliyun.com/jiaocheng/183702.html

6. 關於4.0以上版本gdb調試時設置不了斷點的問題

https://blog.csdn.net/WANG__RONGWEI/article/details/79207536?utm_source=blogxgwz3

取消選項：
[ ] Randomize the address of the kernel image (KASLR)

7. qemu-system-i386 -curses -kernel ./linux-4.15.12/arch/x86/boot/bzImage -initrd ./rootfs.img -S –s

   4.15的qemu  gdb斷點調試，最新內核配置如下

 

 

除了上面的，別的都不選，編譯出來的內核1.2M

https://www.cnblogs.com/pengdonglin137/p/6442598.html

https://blog.csdn.net/yejingx/article/details/6525405

還有兩個參考別人的網站