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Re: [Xen-devel] [RFC 20/22] x86/relocs: Add option to generate 64-bit relocations

On 07/19/17 15:47, Thomas Garnier wrote:
> On Wed, Jul 19, 2017 at 3:33 PM, H. Peter Anvin <hpa@xxxxxxxxx> wrote:
>> On 07/18/17 15:33, Thomas Garnier wrote:
>>> The x86 relocation tool generates a list of 32-bit signed integers. There
>>> was no need to use 64-bit integers because all addresses where above the 2G
>>> top of the memory.
>>> This change add a large-reloc option to generate 64-bit unsigned integers.
>>> It can be used when the kernel plan to go below the top 2G and 32-bit
>>> integers are not enough.
>> Why on Earth?  This would only be necessary if the *kernel itself* was
>> more than 2G, which isn't going to happen for the forseeable future.
> Because the relocation integer is an absolute address, not an offset
> in the binary. Next iteration, I can try using a 32-bit offset for
> everyone.

It is an absolute address *as the kernel was originally linked*, for
obvious reasons.


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