linux-kernel - Re: [PATCH 2.6.26 2/25] mdb: Merkey's Kernel Debugger

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Date:	Tue, 5 Aug 2008 19:24:20 -0600 (MDT)
From:	jmerkey@...fmountaingroup.com
To:	"Andi Kleen" <andi@...stfloor.org>
Cc:	jmerkey@...fmountaingroup.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.26 2/25] mdb: Merkey's Kernel Debugger


I'll post some patches with these changes and submit it as a module.  I
will of course need to patch the kernel to introduce the die notifiers
where
they are not and there's the issue of cross call NMI to stop other
processors on SMP.

That's the real issues, Andi, is the xcall stuff for IPC to control all
the processors.

Jeff


> jmerkey@...fmountaingroup.com writes:
>> regs->ip)
>> -#ifndef CONFIG_KPROBES
>> +#if !defined(CONFIG_KPROBES) && !defined(CONFIG_MDB)
>>  DO_VM86_ERROR(3, SIGTRAP, "int3", int3)
>>  #endif
>>  DO_VM86_ERROR(4, SIGSEGV, "overflow", overflow)
>> @@ -733,6 +747,9 @@
>>  {
>>  	if (notify_die(DIE_NMIUNKNOWN, "nmi", regs, reason, 2, SIGINT) ==
>> NOTIFY_STOP)
>>  		return;
>> +#ifdef	CONFIG_MDB
>> +        mdb(NMI_EXCEPTION, reason, regs); // nmi is code 2
>> +#endif
>
> This should be all using die notifiers (register_die etc.) like the
> other kernel debuggers, not own hooks. As you can see there is already
> a notify_die call around basically all the places you put in a mdb()
> call, and you can just hook in there. If your other interfaces to the core
> kernel are clean enough this would even allow to use your debugger as a
> module.
>
> -Andi
>


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