From owner-freebsd-alpha  Tue Oct 17  3:39:16 2000
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To: gallatin@FreeBSD.org
Cc: freebsd-alpha@freebsd.org
Subject: Re: cvs commit: src/sys/alpha/alpha exception.s
 src/sys/alpha/include         asm.h
In-Reply-To: <200010162015.NAA18435@freefall.freebsd.org>
References: <200010162015.NAA18435@freefall.freebsd.org>
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Date: Tue, 17 Oct 2000 19:39:05 +0900
From: Kenjiro Cho <kjc@csl.sony.co.jp>
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Thanks!  FreeBSD-4.1/KAME now boots up with this fix.
Please MFC.

-Kenjiro

> gallatin    2000/10/16 13:15:43 PDT
> 
>   Modified files:
>     sys/alpha/alpha      exception.s 
>     sys/alpha/include    asm.h 
>   Log:
>   Fix problems booting large kernels on alphas.   The symptom is that the kernel
>   loads, prints the copyright, and either hangs or locks solid.  The
>   PC tends to be in the data segment and the RA is in XentMM
>   
>   Doug really came up with the fix, I'm just the monkey typing.  Doug says:
>   	The alpha can only support 64k of globals with $gp pointing at
>   	base+32k so that the code can use 16bit signed offsets from $gp to
>   	access it. ....  it is possible to have multiple .got subsections
>   	and the linker handles this with the relocations for 'ldgp' pseudo
>   	instructions.  [Without this patch] the code in exception.s has been
>   	linked  to use a different gp from locore.s (where pal_kgp is set).
>   
>   Reviewed by: dfr
>   
>   Revision  Changes    Path
>   1.4       +5 -1      src/sys/alpha/alpha/exception.s
>   1.8       +5 -2      src/sys/alpha/include/asm.h
> 
> 


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