2010/4/6 Luciano Montanaro <mikel...@gmail.com> > On Tue, Apr 6, 2010 at 9:21 AM, Alex Vazquez <alexvazquezfe...@gmail.com> > wrote: > > Hello list, > > > > I'm cross-compiling WebKit (revision 40084) for a MIPS board using > DirectFB > > backend. > > > > While executing in the target, libwebkit is causing SIGBUS errors due to > > misaligned double data. The errors raise when loading a misaligned double > in > > the FPU using the ldc1 instruction (it is stated in the MIPS > documentation > > that data loaded in the FPU must be 8-byte aligned to avoid an address > > error). I know that the kernel can be configured to manage misaligned > > accesses but i prefer not to mess with that by the moment. > > I have SIGBUS problems cross-compiling on SH4 with Qt, similar to yours. > Debug builds work fine, but release builds crash as soon as the first > webkit-related > call is made. I've not had time to investigate further, though I'll > soon have to. > > I'm looking into your suggestion, and I see the class is not > optimallly laid out (there is a function pointer which is presumably 4 > bytes, followed by a double which is 8), though the compiler should > correctly align it putting a 4 byte hole between the pointer and the > double. At new time, the class should be allocated from a correctly > aligned memory block, so any misalignments are probably due to copying > the class around? > > Yes, it seems to be unaligned anywhere else in the code. I'll try to find where and report back.
Regards, > > > -- > Luciano Montanaro > > Anyone who is capable of getting themselves made President should on > no account be allowed to do the job. -- Douglas Adams > -- Alejandro Vazquez Fente
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