From: tsbogend@alpha.franken.de (Thomas Bogendoerfer)
To: Ralf Baechle <ralf@linux-mips.org>
Cc: Kumba <kumba@gentoo.org>, linux-mips@linux-mips.org
Subject: Re: IP22 64bit kernel
Date: Thu, 13 Sep 2007 20:23:48 +0200 [thread overview]
Message-ID: <20070913182348.GA11473@alpha.franken.de> (raw)
In-Reply-To: <20070913155059.GA8790@linux-mips.org>
On Thu, Sep 13, 2007 at 04:50:59PM +0100, Ralf Baechle wrote:
> The problem isn't limited to ARC firmware; basically any non-R8000 64-bit
> system can be affected. A kernel may be using either addresses in XKPHYS
> or in CKSEG0 and the segment for which the kernel is linked is not
> necessarily the same that the firmware will load it to.
here is a patch:
Always jump to the place where the kernel is linked to. This helps
where the bootloaders/proms ignores the start address inside the ELF
header.
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
---
diff --git a/arch/mips/kernel/head.S b/arch/mips/kernel/head.S
index e46782b..80d0ab9 100644
--- a/arch/mips/kernel/head.S
+++ b/arch/mips/kernel/head.S
@@ -27,16 +27,6 @@
#include <kernel-entry-init.h>
- .macro ARC64_TWIDDLE_PC
-#if defined(CONFIG_ARC64) || defined(CONFIG_MAPPED_KERNEL)
- /* We get launched at a XKPHYS address but the kernel is linked to
- run at a KSEG0 address, so jump there. */
- PTR_LA t0, \@f
- jr t0
-\@:
-#endif
- .endm
-
/*
* inputs are the text nasid in t1, data nasid in t2.
*/
@@ -155,7 +145,11 @@ NESTED(kernel_entry, 16, sp) # kernel entry point
setup_c0_status_pri
- ARC64_TWIDDLE_PC
+ /* We might not get launched at the address the kernel is linked to,
+ so we jump there. */
+ PTR_LA t0, 0f
+ jr t0
+0:
#ifdef CONFIG_MIPS_MT_SMTC
/*
--
Crap can work. Given enough thrust pigs will fly, but it's not necessary a
good idea. [ RFC1925, 2.3 ]
next prev parent reply other threads:[~2007-09-13 18:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-11 21:30 IP22 64bit kernel Thomas Bogendoerfer
2007-09-12 23:15 ` Ralf Baechle
2007-09-13 7:05 ` Kumba
2007-09-13 15:50 ` Ralf Baechle
2007-09-13 18:23 ` Thomas Bogendoerfer [this message]
2007-10-17 18:36 ` Ralf Baechle
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