Re: [PATCH bpf-next] m68k, bpf: Add initial BPF JIT compiler support

On Wed, Apr 29, 2026 at 03:59:44PM +0200, John Paul Adrian Glaubitz wrote:
> Hi Kuan-Wei,
> 
> On Wed, 2026-04-29 at 12:40 +0000, Kuan-Wei Chiu wrote:
> > Add a BPF JIT compiler for the m68k architecture.
> > 
> > The JIT generates m68k machine code targeting m68020+ processors. It
> > currently excludes 68000/68010 and coldfire processors, as it relies on
> > 32 bit branch displacements (b<cc>.l) to handle large bpf programs.
> 
> First of all, this is extremely cool! Thanks a lot for the work!

Thanks. :)

> 
> Secondly, since you seem to be well-versed in compiler-related stuff on
> m68k, may I ask you whether you would be interested in helping to fix a
> stopper bug in the LLVM M68k backend?
> 
> I have outlined the problem in [1], maybe you could help getting this fixed
> as this would fully enable LLVM on M68k which means we could finally use
> Rust on the architecture and maybe also build the Linux kernel on m68k
> with clang.
> 
I'm not very familiar with the llvm codebase, but I'll definitely take
a look at it and see how much I can help out. :)

Regards,
Kuan-Wei