Re: question about head_64.S

[Cao jin]

Hi, Kirll,

On 1/15/19 7:45 PM, Cao jin wrote:
> Hi,
>   I have been digging into this file for a while, and I still have 2
> questions unclear, hope to get your help.
> 

> 
> 2.
> Why gdt64 has following definition?:
> 
> gdt64:
> 	.word	gdt_end - gdt
> 	.long	0
> 	.word	0
> 	.quad   0
> 
> obviously, gdt64 stores the GDTR content under x86_64, which is 10 bytes
> long, so why not just:
> 
> gdt64:
> 	.word	gdt_end - gdt
> 	.quad   0
> 
> With above modification, it can boot.
> 

Seems you introduced gdt64 code in commit beebaccd50, could you help
with this question?

And it also remind me of another question about adjust_got which is also
introduced by you. Because I failed to construct a test environment with
ld version less than 2.24 until now, so I wanna do a quick ask here:
does it make sense to adjust GOT from the 4th entry of it? Because as I
know, the first 3 entries are special one, which (I guess) will be not used.
-- 
Sincerely,
Cao jin