Re: Bug#539378: [hppa]: fails to load nfs module: Global Offset Table
On Fri, Jul 31, 2009 at 5:09 PM, Helge Deller<deller@gmx.de> wrote:
> On 07/31/2009 09:03 PM, John David Anglin wrote:
>>>
>>> Only 32-bit targets have the 14-bit signed immediate offset (0x3fff),
>>> which becomes a 13-bit limit when loading positive offsets e.g.
>>> +0x1fff or 1023 GOT slots.
>>
>> Can't we offset the table and double the number of entries?
>
> Dave,
> Can you explain this idea a little more?
I would also like a little more details.
However, this is similar to the DT_PLTGOT issue in dynamic libraries.
The value chosen for %dp is arbitrary, and if we made it point into
the middle of the GOT table, then you would reference the GOT using
both positive and negative offsets.
For example, this code:
fdesc->gp = (Elf_Addr)me->module_core + me->arch.got_offset;
Arbitrary chooses the module %dp to point at the start of got_offset,
why not make that got_offset + <half way>.
Cheers,
Carlos.
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