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SubjectRe: R_SPARC_13


On 18/01/2011 06:50, David Miller wrote:
> From: David Miller<davem@davemloft.net>
> Date: Mon, 17 Jan 2011 16:37:09 -0800 (PST)
>
>> So we do end up seeing the R_SPARC_LO10 + R_SPARC_13 sequences in the
>> final module object.
>>
>> Therefore, we really should handle R_SPARC_13 in the sparc module loader.
>
> Ok, I now feel like I'm hallucinating.
>
> davem@sunset:~/src/GIT/linux-2.6-stable$ uname -a
> Linux sunset 2.6.37 #1 SMP Wed Jan 12 20:14:59 PST 2011 sparc64 GNU/Linux
> davem@sunset:~/src/GIT/linux-2.6-stable$ objdump --reloc /lib/modules/2.6.37/kernel/net/ipv6/ipv6.ko | grep R_SPARC_13
> 0000000000000c7c R_SPARC_13 *ABS*+0x0000000000000004
> 0000000000001ae4 R_SPARC_13 *ABS*+0x0000000000000018
> 0000000000001b0c R_SPARC_13 *ABS*+0x0000000000000008
> ...
> davem@sunset:~/src/GIT/linux-2.6-stable$ lsmod | grep ipv6
> ipv6 240422 12
> davem@sunset:~/src/GIT/linux-2.6-stable$
>
> I must be missing something obvious.
>

I think objdump may be distorting the truth a little. I found the
following in binutils gas/config/tc-sparc.c tc-gen_reloc(). I wonder if
it is displaying rewritten records rather than displaying the raw
contents. I haven't traced it through the code but the fact that it is
obviously working for you means that something like this is going on.

/* We expand R_SPARC_OLO10 to R_SPARC_LO10 and R_SPARC_13
on the same location. */
if (code == BFD_RELOC_SPARC_OLO10)
{
relocs[1] = reloc = (arelent *) xmalloc (sizeof (arelent));
relocs[2] = NULL;

reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *));
*reloc->sym_ptr_ptr
= symbol_get_bfdsym (section_symbol (absolute_section));
reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
reloc->howto = bfd_reloc_type_lookup (stdoutput, BFD_RELOC_SPARC13);
reloc->addend = fixp->tc_fix_data;
}

I will try your alignment patch without any R_SPARC_13 related changes
and see how that goes.

Regards

Richard


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