linux-kernel - Re: [Xen-devel] incorrect layout of globals from head

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Date:	Fri, 06 Jul 2012 14:53:45 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Olaf Hering" <olaf@...fle.de>
Cc:	<kexec@...ts.infradead.org>, <xen-devel@...ts.xensource.com>,
	"Daniel Kiper" <dkiper@...-space.pl>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] incorrect layout of globals from head_64.S
 during kexec boot

>>> On 06.07.12 at 15:31, Olaf Hering <olaf@...fle.de> wrote:
> On Fri, Jul 06, Jan Beulich wrote:
> 
>> >>> On 06.07.12 at 14:07, Olaf Hering <olaf@...fle.de> wrote:
>> > But adding some debug to inspect
>> > *output in parse_elf() shows that the second entry in program headers is
>> > already shifted by 44 bytes in my testing, the others are shifted by the
>> > same amount.
>> 
>> Unfortunately it's not clear what is shifted - the printout below
>> looks just fine. Also, from your first mail I understood that the shift
>> there was by an amount not divisible by 4 - does that amount vary?
> 
> The memory location of the second LOAD entry (the .data section) is wrong.
> It should be at 0x1c00000, but in fact its content starts at 0x1c0002c.
> I looked at the x86 boot code, the vmlinux is gzipped and placed as
> binary blob, which is then extracted by decompress().

Are the virtual addresses then offset as well?

Is phdr->p_offset sane?

And you didn't clarify whether the offset was always the same.

Jan

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