On Tue, 2011-01-18 at 10:52 +0000, Richard Mortimer wrote:
>
> On 18/01/2011 06:50, David Miller wrote:
> > From: David Miller<davem@xxxxxxxxxxxxx>
> > 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;
> }
>
Dave,
To close this off as a non-issue as far as my boot failures are
concerned I did some further checking and objdump is displaying
R_SPARC_OLO10 as two separate entries. I checked the scsi_mod.ko binary
and found the appropriate Elf64_Rela entry. That has 0x21 as the LSB of
r_info and that is the proper code for R_SPARC_OLO10 which is what you
expected in the first place!
objdump displays
0000000000001618 R_SPARC_LO10 __tracepoint_module_get
0000000000001618 R_SPARC_13 *ABS*+0x0000000000000008
The binary contains
0505140 00 00 00 00 00 00 16 18 00 00 04 0b 00 00 08 21
^^
0505160 00 00 00 00 00 00 00 00
which corresponds to
typedef struct elf64_rela {
Elf64_Addr r_offset; /* Location at which to apply the action */
Elf64_Xword r_info; /* index and type of relocation */
Elf64_Sxword r_addend; /* Constant addend used to compute value */
} Elf64_Rela;
Regards
Richard
> I will try your alignment patch without any R_SPARC_13 related changes
> and see how that goes.
>
> Regards
>
> Richard
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