Qemu 调试内核 出错 Remote 'g' packet reply is too long:
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按照博客http://blog.csdn.net/sunnybeike/article/details/6648815Qemu 调试内核,
qemu的启动方式如下,
qemu-system-x86_64 -kernel bzImage -hda linux-0.2.img -append "root=/dev/hda" -S
在弹出的qemu中,按住Ctrl+Alt+2,进入Qemu控制端,然后输入 gdbserver
然后,另起一个端口,输入
gdb vmlinux
出现如下错误:
尝试了不同版本的Qemu和gdb,但是都没有解决问题,实际上是gdb出现问题了。
这篇文章(http://www.yonch.com/tech/84-debugging-the-linux-kernel-with-qemu-and-eclipse)解释了原因,
“Note that other tutorials also add a "-S" parameter so QEMU starts the kernel stopped, however this is ommitted deliberately. The "-S" parameter would allow gdb to set an initial breakpoint anywhere in the kernel before kernel execution begins. Unfortunately, a change made to the gdbserver in QEMU, to support debugging 32- and 16-bit guest code in an x86_64 session breaks the -S functionality. The symptoms are that gdb prints out "Remote 'g' packet reply is too long:", and fails to interact successfully with QEMU. The suggested fix is to run the QEMU until it is in 64-bit code (i.e. after the boot loader has finished and the kernel started) before connecting from gdb (omitting the -S parameter). To debug a running kernel, this is sufficient; it is the method we will take.”
但是它的解决方案我没有尝试,
我尝试了这篇文章(http://augustl.com/blog/2014/gdb_progress/)的解决方案,即在gdb开始后,指定体系结构,按照如下方式:
但是失败了。想来,在启动qemu的时候就是用的qemu-system-x86_64,已经指定了要模拟的CPU,再在GDB中指定,是不是多次依据,看来这个也不是解决方案。。
真正的解决方案参考http://blog.sina.com.cn/s/blog_8709e3120101gst1.html,需要修改gdb源码,修改方式如下。主要就是修改buf_len > 2*rsa->sizeof_g_packet时,gdb的处理方式。注意,我用的是7.8内核,所以修改的源码和这篇博客(http://blog.sina.com.cn/s/blog_8709e3120101gst1.html)不太一样,它用的7.5内核。所以,请留意。不过,其实只是结构体变量引用方式的不同。
ps:我的qemu用的是2.1.2,gdb用的是7.8,linux是2.6.31.4
祝各位好运!
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