HEADS UP: sparc64 backend for llvm/clang imported

Florian Smeets flo at smeets.im
Sat Mar 1 15:29:24 UTC 2014

On 01/03/14 02:16, John-Mark Gurney wrote:
> Dimitry Andric wrote this message on Fri, Feb 28, 2014 at 20:22 +0100:
>> For building the sparc64 kernel, there is one open issue left, which is
>> that sys/sparc64/include/pcpu.h uses global register variables, and this
>> is not supported by clang.  A preliminary patch for this is attached,
>> but it may or may not blow up your system, please beware!
>> The patch changes the pcpu and curpcb global register variables into
>> inline functions, similar to what is done on other architectures.
>> However, the current approach is not optimal, and the emitted code is
>> slightly different from what gcc outputs.  Any improvements to this
>> patch are greatly appreciated!
>> Last but not least, thanks go out to Roman Divacky for his work with
>> llvm/clang upstream in getting the sparc64 backend into shape.
> Ok, I have a new pcpu patch to try.  I have only compile tested it.
> It is available here:
> https://www.funkthat.com/~jmg/sparc64.pcpu.patch
> I've also attached it.
> Craig, do you mind testing it?

My machine doesn't boot with this patch.

OK boot -v
jumping to kernel entry at 0xc0088000.
OF_panic: sparc64_init: cannot find boot CPU node
Program terminated
{1} ok

I'm now going to try the version that dim sent.


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