From owner-freebsd-current  Wed Mar 14 17:54:16 2001
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X-Mailer: exmh version 2.1.1 10/15/1999
To: Richard Todd <rmtodd@ichotolot.servalan.com>
Cc: current@freebsd.org
Subject: Re: Tracking down problem with booting large kernels (bug in locore.s) 
In-Reply-To: <m14d4CL-004Ml3C@servalan.servalan.com> 
Date: Wed, 14 Mar 2001 17:53:59 -0800
From: Peter Wemm <peter@yahoo-inc.com>
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Richard Todd wrote:
> In message <200103140442.f2E4gni01710@daintree.yahoo.com>, Peter Wemm writes:
> >Richard Todd wrote:
> >
> >> <---- No crashes as of here
> >> 	pushl	$begin				/* jump to high virtualized add
> >    ress */
> >> 	ret   
> >> 
> >> /* now running relocated at KERNBASE where the system is linked to run */
> >> begin:
> >> <==== crashes before it gets here!!!
> >> 	/* set up bootstrap stack */
> >> 	movl	proc0paddr,%eax			/* location of in-kernel pages 
> >    */
> >
> >I have some suspicions..  Can you do a nm on your kernel?
> >
> >peter@daintree[8:41pm]~-102> nm /boot/kernel/kernel  |grep begin
> >c0123689 t begin
> >
> 
> Sure.  A working kernel (the one I'm booted off of now) shows:
> 55 ichotolot ~[11:49PM] Z% nm /boot/kernel.good5/kernel | grep begin
> c0128c79 t begin
> c0368b3f t mp_begin
> 
> and one that crashes shows:
> 
> 56 ichotolot ~[11:50PM] Z% nm /boot/kernel.old/kernel | grep begin
> c01290a9 t begin
> c038d49f t mp_begin

Now I am confused.  I can't see any logical reason why the jump to "begin"
should fail like that...  It is only ~168K into the text section...

Cheers,
-Peter
--
Peter Wemm - peter@yahoo-inc.com; peter@FreeBSD.org; peter@wemm.org
"All of this is for nothing if we don't go to the stars" - JMS/B5


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