klibc - Dec 2018 - question about KLIBCSHAREDFLAGS

Dear experts,

I'm new in klibc and currently studying the source codes.
I'm looking at the codes in usr/klibc/arch and can't figure out why
does, e.g. in x86_64, the text segment offset differ from system v
x86_64 abi (which is 4 Mb)? How does this value was calculated?

Thanks in advance!
Nikita.

On 11/23/18 8:09 AM, eno wrote:
> Dear experts,
> 
> I'm new in klibc and currently studying the source codes.
> I'm looking at the codes in usr/klibc/arch and can't figure out why
> does, e.g. in x86_64, the text segment offset differ from system v
> x86_64 abi (which is 4 Mb)? How does this value was calculated?
> 
> Thanks in advance!
> Nikita.
It is set so that klibc.so is loaded at an address where it doesn't
conflict with the load address of an executable, but is still within
range of an intramodule control transfer (which is architecture-dependent.)

	-hpa

Hi Peter,

Thank you for the answer!

??, 20 ???. 2018 ?. ? 00:02, H. Peter Anvin <hpa at
zytor.com>:
>
> On 11/23/18 8:09 AM, eno wrote:
> > Dear experts,
> >
> > I'm new in klibc and currently studying the source codes.
> > I'm looking at the codes in usr/klibc/arch and can't figure
out why
> > does, e.g. in x86_64, the text segment offset differ from system v
> > x86_64 abi (which is 4 Mb)? How does this value was calculated?
> >
> > Thanks in advance!
> > Nikita.
>
> It is set so that klibc.so is loaded at an address where it doesn't
> conflict with the load address of an executable, but is still within
> range of an intramodule control transfer (which is architecture-dependent.)
>
>         -hpa
>