Re: [Qemu-devel] Debugging aarch64 guest running on Foundationv8 model

[Peter Maydell]

On 27 February 2014 09:45, Jani Kokkonen <address@hidden> wrote:
> Hi,
>
> I would like to debug a Qemu guest linux kernel under Foundationv8 model and
> I tried  the following setup:
>
> 1.  Foundationv8 model started with --network=nat and
> --network-nat-ports=1234=1234 options
> 2. In Foundationv8 model I started qemu-system-aarch64 with the command
> line:
>
> ./qemu-system-aarch64  -M virt -cpu host  -kernel Image -serial stdio
> -display none  -enable-kvm -gdb tcp::1234 -S
>
> 3. I start debugging the guest kernel with aarch64-linux-gnu-gdb vmlinux
> and with target remote:1234 command.
>
> However when I set any breakpoint I will get error message:
> "Cannot insert breakpoint 1.
> Error accessing memory address 0xffffffc000636498: Unknown error -1"
> In addition stepi or any other run related command does not work.

You would need to implement breakpoint support for AArch64 in
both KVM and QEMU, I think. That feature is currently not implemented.

thanks
-- PMM