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    <p>Another option is to use <a href="http://en.wikipedia.org/wiki/In-circuit_emulator" rel="nofollow noreferrer">ICE</a>/JTAG controler, and GDB. This 'hardware' solution is especially used with embedded systems, </p> <p>but for instance Qemu offers similar features: </p> <ul> <li><p>start qemu with a gdb 'remote' stub which listens on 'localhost:1234' : <code>qemu -s ...</code>, </p></li> <li><p>then with GDB you open the kernel file <code>vmlinux</code> compiled with debug informations (you can take a look a <a href="https://lkml.org/lkml/2010/11/28/211" rel="nofollow noreferrer">this</a> mailing list thread where they discuss the unoptimization of the kernel).</p></li> <li><p>connect GDB and Qemu: <code>target remote localhost:1234</code></p></li> <li><p>see you're <em>live</em> kernel:</p> <pre><code>(gdb) where #0 cpu_v7_do_idle () at arch/arm/mm/proc-v7.S:77 #1 0xc0029728 in arch_idle () atarm/mach-realview/include/mach/system.h:36 #2 default_idle () at arm/kernel/process.c:166 #3 0xc00298a8 in cpu_idle () at arch/arm/kernel/process.c:199 #4 0xc00089c0 in start_kernel () at init/main.c:713 </code></pre></li> </ul> <p>unfortunately, user-space debugging is not possible so far with GDB (no task list information, no MMU reprogramming to see different process contexts, ...), but if you stay in kernel-space, that's quite conveniant.</p> <ul> <li><code>info threads</code> will give you the list and states of the different <em>CPUs</em></li> </ul> <p><strong>EDIT:</strong></p> <p>You can get more details about the procedure in this PDF: </p> <blockquote> <p><a href="http://files.meetup.com/1590495/debugging-with-qemu.pdf" rel="nofollow noreferrer">Debugging Linux systems using GDB and QEMU</a>.</p> </blockquote>
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    1. COI tried something similar to this Qemu technique some time ago, it's pretty cool.
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