llvm dev - Jan 2017 - Linking Linux kernel with LLD

>At this point I'm able to link Linux kernel with LLD and objcopy
doen't give me any errors.
>
>The versions are:
>
>Linux 4.10.0-rc5 (+ applied the patch from my previous message)
>LLD 5.0.0 (https://github.com/llvm-mirror/lld
db83a5cc3968b3aac1dbe3270190bd3282862e74) (+ applied D28612)
>GNU objcopy (GNU Binutils) 2.27
>
>The problem is that the resulting kernel doesn't boot. Does anybody have
any suggestions on how to debug it or any guesses what did go wrong while
linking?
>
>Regards,
>Dmitry
It should not boot atm, I believe.
I mentioned earlier, LLD currently generates wrong output for scripts like:


.rodata : {
 *(.rodata)
 *(.rodata.*)
 . = ALIGN(16);
 video_cards = .;
 *(.videocards)
 video_cards_end = .;?

That is sample from kernel realmode script. We produce wrong values for
video_cards/video_cards_end.
Reduced sample is D29217, and thread with possible patch for that is D27415
which is under discussions now.
(Though there are also probably can be other issues, but that one is obvious
atm).

I have a question also. You added -m elf_i386 to workaround emulation conflict
issue in LLD, do you know
does output produced by BFD boot fine after that change ?

George.
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<div>> I have a question also. You added <span
style="font-family:"Segoe UI","Segoe UI Web
Regular","Segoe UI Symbol",Lato,"Helvetica
Neue",Helvetica,Arial,sans-serif;font-size:13px;background-color:rgb(255,255,255);">-m
elf_i386 </span>to workaround emulation conflict issue in LLD, do you
know<div>> does output produced by BFD boot fine after that change
?</div>Doesn't seem to affect BFD at all.</div><div><br
/></div><div><br /></div><div>29.01.2017,
10:18, "George Rimar"
<grimar@accesssoftek.com>:</div><blockquote
type="cite">




<div dir="ltr"
style="font-size:12pt;color:#000000;background-color:#FFFFFF;font-family:Calibri,Arial,Helvetica,sans-serif;">
<p><span
style="color:rgb(33,33,33);font-size:12pt;">>At this point
I'm able to link Linux kernel with LLD and objcopy doen't give me any
errors.</span><br />
</p>
<div style="color:rgb(33,33,33);">
<div>
<div>> </div>
<div>>The versions are:</div>
<div>> </div>
<div>>Linux 4.10.0-rc5 (+ applied the patch from my previous
message)</div>
<div>>LLD 5.0.0 (<a
href="https://github.com/llvm-mirror/lld">https://github.com/llvm-mirror/lld</a>
db83a5cc3968b3aac1dbe<span>3270190</span>bd<span>3282862</span>e74)
(+ applied D28612)</div>
<div>>GNU objcopy (GNU Binutils) 2.27</div>
<div>> <br />
</div>
<div>>The problem is that the resulting kernel doesn't boot. Does
anybody have any suggestions on how to debug it or any guesses what did go wrong
while linking?</div>
<div>> </div>
<div>>Regards,</div>
<div>>Dmitry<br />
</div>
<div><br />
</div>
<div>It should not boot atm, I believe.<br />
I mentioned earlier, LLD currently generates wrong output for scripts
like:<br />
</div>
<div><br />
</div>
<div>
<pre
style="margin-top:0px;margin-bottom:0px;padding:12px;border:0px;background:rgba(71,87,120,0.0784314);overflow:auto;border-radius:3px;white-space:pre-wrap;font-stretch:normal;font-size:12px;line-height:15px;font-family:Menlo,Consolas,Monaco,monospace;">.rodata
: {
 *(.rodata)
 *(.rodata.*)
 . = ALIGN(16);
 video_cards = .;
 *(.videocards)
 video_cards_end = .;​<br /></pre>
<br />
</div>
<div>That is sample from kernel realmode script. We produce wrong values
for video_cards/video_cards_end.<br />
</div>
<div>Reduced sample is D29217, and thread with possible patch for that
is D27415 which is under discussions now.<br />
</div>
<div>(Though there are also probably can be other issues, but that one is
obvious atm).<br />
</div>
<div><br />
</div>
<div>I have a question also. You added <span
style="font-family:"Segoe UI","Segoe UI Web
Regular","Segoe UI Symbol",Lato,"Helvetica
Neue",Helvetica,Arial,sans-serif;font-size:13px;background-color:rgb(255,255,255);">-m
elf_i386 </span>to workaround
 emulation conflict issue in LLD, do you know<br />
</div>
<div>does output produced by BFD boot fine after that change ?<br />
</div>
<div><br />
</div>
<div>George.<br />
</div>
</div>
</div>
</div>

</blockquote>

>> I have a question also. You added -m elf_i386 to workaround emulation
conflict issue in LLD, do you know
>> does output produced by BFD boot fine after that change ?
>Doesn't seem to affect BFD at all.
Thanks !

?George.
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