General setup --->[*] Kprobes[*] Enable loadable module support --->
Kernel hacking --->Compile-time checks and compiler options  ---> [*] Compile the kernel with debug info[*] Tracers  --->[*]   Enable uprobes-based dynamic events

git clone git@github.com:pengdonglin137/kgtp.git -b  aarch32_version

make
make install

# 在PC机上将vmlinux拷贝到NFS共享目录下
cp /home/pengdonglin/src/qemu/aarch32/linux-4.10/out_aarch32/vmlinux /nfsroot/# 进入板子，挂载共享目录
[root@vexpress ]# mount -t nfs -o nolock 192.168.1.100:/nfsroot /mnt# 加载驱动
[root@vexpress ]# insmod /mnt/install/modules/gtp.ko # 运行gdb
[root@vexpress ]# gdb
GNU gdb (GDB) 8.0
Copyright (C) 2017 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 "arm-none-linux-gnueabi".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word".# 加在vmlinux
(gdb) file /mnt/vmlinux
Reading symbols from /mnt/vmlinux...done.# 将gdb连接到gtp上
(gdb) target remote /sys/kernel/debug/gtp
Remote debugging using /sys/kernel/debug/gtp

#打印jiffies_64变量
(gdb) p jiffies_64
$1 = 4294969128
(gdb) p jiffies_64
$2 = 4294969245
(gdb) p jiffies_64
$3 = 4294969332
(gdb) p jiffies_64
$4 = 4294969419
(gdb) 

在板子上运行nc命令：nc -l -p 2345 < /sys/kernel/debug/gtp > /sys/kernel/debug/gtp 之后，nc会在那里等待连接。在PC上运行GDB：$arm-none-linux-gnueabi-gdb ./vmlinux
GNU gdb (Sourcery CodeBench Lite 2014.05-29) 7.7.50.20140217-cvs
Copyright (C) 2014 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 "--host=i686-pc-linux-gnu --target=arm-none-linux-gnueabi".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://sourcery.mentor.com/GNUToolchain/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./vmlinux...done.
# 连接板子上的GTP
(gdb) target remote 192.168.1.2:2345
Remote debugging using 192.168.1.2:2345
0x00000000 in ?? ()# 查看jiffies_64的值
(gdb) p jiffies_64
$1 = 4295030342
(gdb) p jiffies_64
$2 = 4295030453
(gdb) p jiffies_64
$3 = 4295030536
(gdb) p jiffies_64
$4 = 4295030622
(gdb)