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

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Date:	Fri, 6 Jul 2012 15:31:05 +0200
From:	Olaf Hering <olaf@...fle.de>
To:	Jan Beulich <JBeulich@...e.com>
Cc:	Daniel Kiper <dkiper@...-space.pl>, kexec@...ts.infradead.org,
	xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org
Subject: Re: [Xen-devel] incorrect layout of globals from head_64.S during
 kexec boot

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().

I will cleanup my debug changes and post the output.

Olaf

> > Program Headers:
> >   Type           Offset   VirtAddr           PhysAddr           FileSiz  
> > MemSiz   Flg Align
> >   LOAD           0x200000 0xffffffff81000000 0x0000000001000000 0xa3b000 
> > 0xa3b000 R E 0x200000
> >   LOAD           0xe00000 0xffffffff81c00000 0x0000000001c00000 0x05b0e8 
> > 0x05b0e8 RW  0x200000
> >   LOAD           0x1000000 0x0000000000000000 0x0000000001c5c000 0x012c40 
> > 0x012c40 RW  0x200000
> >   LOAD           0x106f000 0xffffffff81c6f000 0x0000000001c6f000 0x087000 
> > 0x702000 RWE 0x200000
> >   NOTE           0x82d5bc 0xffffffff8162d5bc 0x000000000162d5bc 0x00017c 
> > 0x00017c     0x4
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