Re: [Qemu-devel] PPC: Regression booting NetBSD

[Peter Maydell <peter.maydell@linaro.org>]

On 10 December 2013 14:24, Mark Cave-Ayland
<mark.cave-ayland@ilande.co.uk> wrote:
> I've been running my OpenBIOS test suite on a recent git (commit a1d22a) and
> have encountered a QEMU process segfault in 2 out of 3 of my NetBSD 5.0.2
> boot attempts. Does anyone have an idea what could be causing this? Other
> OSs don't seem to be affected.
>
>
> build@kentang:~/rel-qemu-git/bin$ ./qemu-system-ppc -cdrom
> /home/build/src/qemu/image/ppc/macppccd-5.0.2.iso -boot d -bios
> /home/build/src/openbios/openbios-git/openbios-devel/obj-ppc/openbios-qemu.elf.nostrip
> qemu: fatal: Trying to execute code outside RAM or ROM at 0x0a64696c
>
> NIP 0a64696c   LR 0a64696d CTR 00000000 XER 00000000
> MSR 00009030 HID0 00000000  HF 00000000 idx 1

[etc]

This isn't a QEMU process segfault -- it's just that the guest
has attempted to jump to a memory location which is neither
RAM nor ROM (you can see the guest NIP is the same address
the message prints). This is probably because something has
gone wrong some distance further back in guest execution;
identifying exactly what that was might require some tedious
debugging :-)

thanks
-- PMM