[Pixman] SIGBUS in pixman_composite_src_0565_0565_asm_neon

hubert-b at gmx.de hubert-b at gmx.de
Wed Feb 1 06:20:11 PST 2012

Hi Siarhei, hi pixman-developers!

Thanks for your help. It turned out that my frame buffer driver for the Multiinno display was the problem - it was using kmalloc and thus, the allocated memory was not aligned (i.e. it didn't start at a multiple of PAGE_SIZE).

It's now fixed and the SIGBUS suddenly disappeared.

Again, thanks for your help :-)

Best regards

-------- Original-Nachricht --------
> Datum: Tue, 31 Jan 2012 17:13:37 +0200
> Von: Siarhei Siamashka <siarhei.siamashka at gmail.com>
> An: hubert-b at gmx.de
> CC: pixman at lists.freedesktop.org
> Betreff: Re: [Pixman] SIGBUS in pixman_composite_src_0565_0565_asm_neon

> On Tue, Jan 31, 2012 at 4:47 PM, Siarhei Siamashka
> <siarhei.siamashka at gmail.com> wrote:
> > On Tue, Jan 31, 2012 at 3:44 PM,  <hubert-b at gmx.de> wrote:
> > Thanks for the log. The "Unhandled fault: imprecise external abort
> > (0x1c06) at 0x404bce10" message can be decoded using the information
> > from:
> >  
>  http://infocenter.arm.com/help/topic/com.arm.doc.ddi0344k/Bgbiaghh.html
> > For imprecise aborts, only bits [3:0] of DFSR (0x1c06) are valid and
> > they can be decoded as "b000110 access flag fault, page".
> Well, it's actually decoded as "bx10110 imprecise external abort" if
> not forgetting to take bit 10 into account. And bit 12 set to 1 means
> "AXI Slave error caused the abort". But the rest still stands.
> > The 0x404bce10 address related to r4 register and used for reading data
> > is most likely misleading. The actual problem seems to be caused by
> > writing data to the memory address stored in r2 register (0x1d02010),
> > which is suspiciously very close to the start of the page. You can
> > inspect the data in memory at various addresses in gdb using "x"
> > command, for example "x/16x 0x1d02000". I guess the framebuffer is
> > just not mapped right, or the code just tries to write data at the end
> > of the framebuffer and fails when accessing the next unmapped page.
> -- 
> Best regards,
> Siarhei Siamashka

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