Re: [Xen-devel] Xen GCC coverage ARM64 testing - Unexpected Trap: Data Abort

[Julien Grall <julien.grall@xxxxxxx>]

(+ Wei)

On 5/2/19 5:55 PM, Viktor Mitin wrote:
> Hi Julien,
Hi,

> Please find trace log below:
>
> root@h3ulcb:~# xencov reset
> (XEN) Data Abort Trap. Syndrome=0x7
> (XEN) Walking Hypervisor VA 0x361700 on CPU3 via TTBR 0x0000000078266000
So this is a data abort when trying to access VA 0x361700 (it is part of 
Xen itself). I misread the Arm Arm before, while ISV is 0 DFSC will 
still provide a correct value. So here we have a "Translation fault, 
level 3".
Which makes sense because ...


> (XEN) 0TH[0x0] = 0x0000000078265f7f
> (XEN) 1ST[0x0] = 0x0000000078262f7f
> (XEN) 2ND[0x1] = 0x004000007825ff7f
> (XEN) 3RD[0x161] = 0x00600000781e1f7e
the 3rd entry is not valid. I managed to reduce the error and it looks 
like gcov is trying to access a counter in the section init.data.
As all the .init.* sections are stripped after boot, it means that 
anything in .init.data cannot be accessed anymore.
Wei, how do you deal with counters in init.data on x86?

Cheers,

--
Julien Grall

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel