[Mesa-dev] Error: unsupported relocations

Jan Vesely jan.vesely at rutgers.edu
Mon Jun 3 01:37:44 UTC 2019

On Mon, 2019-06-03 at 11:12 +1000, Dave Airlie wrote:
> On Mon, 3 Jun 2019 at 10:58, Jan Vesely <jan.vesely at rutgers.edu> wrote:
> > On Sun, 2019-06-02 at 20:09 -0400, James Harvey wrote:
> > > I've started a thread on the llvm mailing list.  See
> > > https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.llvm.org%2Fpipermail%2Fllvm-dev%2F2019-June%2F132750.html&data=02%7C01%7Cjan.vesely%40cs.rutgers.edu%7Ce7c33507211c4512c6ad08d6e7c09d49%7Cb92d2b234d35447093ff69aca6632ffe%7C1%7C0%7C636951211793224808&sdata=lyayMkDxUbTCye%2BynlBZ8sp%2Fc4u5kS4pv%2B2MMeSegoM%3D&reserved=0
> > > 
> > > I don't know if it's needed, but if anyone has a commit in llvm that
> > > started this, that might be helpful.
> > 
> > thanks. however most LLVM developers contributing to AMDGPU backend
> > are AMD folks. The ROCm based stack can handle relocations, so it's up
> > to a volunteer to step up and post a patch (either for mesa or llvm).
> > Fewer relocations should mean faster dispatch, so you they should be
> > interested in taking the LLVM fix.
> > 
> > I've started looking, but the elf structure lists relocations against
> > a section (STT_SECTION), so I still don't know where to get target
> > address.
> Jan,
> this is clearly inline not working, not relocs. We never get the
> missing function to relocate it.

The imagemagick issue might be missed inlining.
I'm working on call* piglits, which mark functions as 'noinline' to
force function calls.
the code clearly expects relative function address:
        s_getpc_b64 s[8:9]
        s_add_u32 s8, s8, i64_func_void at rel32@lo+4
        s_addc_u32 s9, s9, i64_func_void at rel32@hi+4
        s_mov_b32 s32, s10
        s_swappc_b64 s[30:31], s[8:9]
Inspecting the asm and symbol table, the callee functions are there.
It might be that relocations issued for amdgcn-mesa-mesa3d triple are
busted, I'd expect it to use single 4B relative pointer, but last time
I talked to Matt he said it looked correct.


> Dave.

Jan Vesely <jan.vesely at rutgers.edu>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: This is a digitally signed message part
URL: <https://lists.freedesktop.org/archives/mesa-dev/attachments/20190602/ac9e99a0/attachment.sig>

More information about the mesa-dev mailing list