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Date: Tue, 1 May 2007 09:25:39 +0530 From: Vivek Goyal <vgoyal@...ibm.com> To: Andi Kleen <ak@...e.de> Cc: "Eric W. Biederman" <ebiederm@...ssion.com>, Kexec Mailing List <kexec@...ts.infradead.org>, Jurriaan <thunder7@...all.nl>, linux-kernel@...r.kernel.org, Helge Hafting <helgehaf@...el.hist.no>, Horms <horms@...ge.net.au>, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: [PATCH 1/2] x86_64: Reflect the relocatability of the kernel in the ELF header. On Mon, Apr 30, 2007 at 05:17:07PM +0200, Andi Kleen wrote: > On Monday 30 April 2007 17:12:39 Eric W. Biederman wrote: > > > > Currently because vmlinux does not reflect that the kernel is relocatable > > we still have to support CONFIG_PHYSICAL_START. So this patch adds a small > > c program to do what we cannot do with a linker script set the elf header > > type to ET_DYN. > > > > Since last time I have fixed the type to be in my code ET_DYN (oops), > > and verified this works with kexec. I realized while testing that we > > don't have anyway of identifying a kernel vmlinux as linux so we > > probably want to add an ELF note but that will be another patch. > > The patch is ok for me, but does it pass Vivek's usual testing? I am facing one issue with this patch. gdb can not analyze the resulting kernel core file. Looks like gdb treats vmlinux differently if ELF header type is "ET_DYN". It reads the symbol values incorrectly. For example, symbol value of "panic_timeout" is 0xffffffff808a1fa8 but gdb somehow things that it is 0xffffffff008aaebf. Looks like it is performing some relocation. I am using GNU gdb Red Hat Linux (6.5-5.fc6rh). Thanks Vivek - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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