gdb调试艺术之定义钩子命令:-D

gdb调试艺术之定义钩子命令:-D

自定义钩子命令可以在命令执行前/后执行

1.自定义命令执行前的钩子

(gdb) define hook-echo
Type commands for definition of "hook-echo".
End with a line saying just "end".
>echo "<<<"
>end
(gdb) echo
"<<<"(gdb) 

2.自定义命令执行后的钩子

(gdb) define hookpost-echo
Type commands for definition of "hookpost-echo".
End with a line saying just "end".
>echo ">>>"
>end
(gdb) echo
"<<<"">>>"(gdb) 

3.常用的自定义钩子

define hook-stop # 遇到断点或单步调试时,停顿时的钩子
....
end

define hook-run # 执行run命令时的钩子
...
end

define hook-continue # 执行continue命令时的钩子
...
end

经典用法示例:

1.程序执行时忽略SIGUSR1信号引起的运行停止

(gdb) define hook-run
> handle SIGUSR1 nostop
> end

2.汇编调试时, 跟踪显示汇编以及指定寄存器的信息

(gdb) define hook-stop
Type commands for definition of "hook-stop".
End with a l