> On 6/6/2016 9:27 AM, Jon Turney wrote: > > On 06/06/2016 08:24, Yaakov Selkowitz wrote: > >> On 2016-06-03 12:56, Jon Turney wrote: > >>> On 31/05/2016 18:03, Jon Turney wrote: > >>>>> # gdb ./quad-clip > >>>>> [...] > >>>>> (gdb) r > >>>>> [...] > >>>>> Program received signal SIGSEGV, Segmentation fault. > >>>>> 0x7fdf00c1 in ?? () > >>> [...] > >>>>> /usr/src/debug/mesa-demos-8.3.0-1/src/trivial/quad-clip.c:137 > >>>>> (gdb) disassemble 0x7fdf00b1,0x7fdf00d2 > >>>>> Dump of assembler code from 0x7fdf00b1 to 0x7fdf00d2: > >>>>> 0x7fdf00b1: insertps $0x10,0x4(%eax,%edi,1),%xmm0 > >>>>> 0x7fdf00b9: insertps $0x20,0x8(%eax,%edi,1),%xmm0 > >>>>> => 0x7fdf00c1: insertps $0x30,0xfffeff34,%xmm0 > >>>>> 0x7fdf00cb: mov (%esi),%eax > >>>>> 0x7fdf00cd: mul %ecx > >>> > >>> After staring this a bit more, I see that this is the offset to the data > >>> to load, apparently being used as an absolute address > >>> > >>> This seems to be the case with other addresses in the JIT-ed code, so > >>> perhaps there is some problem preventing relocations being applied... > >> > >> FWIW, I tried rebuilding with llvm 3.8.0. 32-bit doesn't crash anymore, > >> and glxgears says its running, but only the background shows. > > > > Thanks, that was next on my list to try > > > > That sounds exactly like what I see with llvm svn r251761 [1] backported > > to 3.7.1 (without which we use the x86_64 loader on x86, rather than > > reporting an error, due to an interesting use of __builtin_undefined, > > with hilarious consequences) > > > > I guess the output of the JIT code is ending up the wrong place as well, > > or something... > > For the record, Jon seems to have tracked this down, and his fix is in > llvm-3.7.1-2. I can only imagine what "fun" he had debugging this, > particularly on the address-starved 32-bit platform. > > Andrew, could you please do the honours?
Awarded! http://cygwin.com/goldstars/#JTy -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
