[hellogcc] 关于GDB hook-stop命令的问题
- From: "Amker.Cheng" <amker.cheng@xxxxxxxxx>
- To: hellogcc@xxxxxxxxxxxxx
- Date: Thu, 21 Jul 2011 11:11:58 +0800
Hi,
GDB文档里面描述的hook-stop命令可用来在被调试程序停下运行时执行一定的操作.
现在我的程序里面有若干硬编码的breakpoint指令(bkpt on arm cortex-m processors),
想通过定义hook-stop命令来跳过这些指令继续执行:
define skip_bkpt
printf "skip_bkpt"
set $pc += 2
c
end
define hook-stop
set $insn = *(unsigned short*)$pc
if ($insn == 0xbeab) ### 0xbeab 是我想skip的bkpt指令的编码
skip_bkpt
end
end
在我执行target program时, hook-stop在第一条bkpt指令处被执行并正确的skip掉bkpt执行并continue,
但是再遇到一条bkpt指令后gdb仍然会停下来, 似乎hook-stop并没有被调用, 输出大概如下:
(gdb) c
Continuing.
Program received signal SIGTRAP, Trace/breakpoint trap.
skip_bkpt
Program received signal SIGTRAP, Trace/breakpoint trap.
0x000022ac in initialise_monitor_handles ()
0x000022ac in initialise_monitor_handles ()
上面0x000022ac处其实也是一条bkpt(0xbeab)指令, 但hook-stop并没有能skip并continue.
之前没用过hook, 不知道什么地方弄错了, Any help?
Thanks very much.
--
Best Regards.
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