Re: [PATCH 3/8] add mem64_min/max control

Eric W. Biederman
2012-11-18T06:50:37Z

Yinghai Lu <yinghai@kernel.org> writes:

> On Sat, Nov 17, 2012 at 10:11 PM, Eric W. Biederman
> <ebiederm@xmission.com> wrote:
>> Yinghai Lu <yinghai@kernel.org> writes:
>>> so -mcmodel=large only work with .c, but does not have effects on .S ?
>>
>> Yes it -mcmodel=large is about which instructions you generate. The
>> instructions used determine the relocates.
>>
>> Just for playing with it the following patch modifies things so
>> purgatory is 64bit clean.
>>
>> I don't know yet what to do with the 32bit and 16bit assembly.
>
> so we should two purgatory for x86_64 ?
> like one for 64bit and one for 32bit/16bit

The problem is that the current 32bit assembly code is not possition
independent. If we can rewrite that assembly code to be position
independent no relocs will be generated and we should be good.

The 16bit entry point code was already written as position independent
code so it should not cause problems.

Just having one piece of code to deal with (if we can figure it out)
looks to be the simpler and more maintainable solution.

Eric