Debugging kernel using qemu and gdb

Question

I was trying to debug the kernel using qemu and gdb. For this I have used the concept of bridge connection between qemu and host machine. In the script I have used the tcp:17777:127.0.0.1:22 to connect the qemu machine for gdb.

But when I do ssh 17777 root@localhost (root is user of qemu), it does not respond me.

Question 1: when I will know that I am on right path means I can debug the kernel using qemu?

When we do:

gdb vmlinux
target remote :1234

Question 2: When i try to do gdb vmlinux and target remote :1234 without booting the kernel I want to debug, still I get the following output (which I get when I boot with qemu for kernel I want to boot).

(gdb) target remote :1234
Remote debugging using :1234
default_idle () at arch/x86/kernel/process.c:299
299         current_thread_info()->status |= TS_POLLING;

Help me to understand the concept in detail and share the link to debug kernel using qemu and gdb

question 2 : When i try to do gdb vmlinux and target remote :1234 without booting the kernel i want to debug , still i get the following output which i get when I boot with qemu for kernel i want to debug. — Dayanand Chinchure, Aug 06 '15 at 10:51
refer similar question http://stackoverflow.com/questions/11408041/kernel-debugging-with-gdb-and-qemu — Prashant Chikhalkar, Aug 06 '15 at 12:42
for complete info take a look at this http://wiki.osdev.org/Kernel_Debugging — Prashant Chikhalkar, Aug 06 '15 at 12:42

Debugging kernel using qemu and gdb

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