Hi Jani,
The video is about aarch64 (not 32-bit arm).
For your original issue, I think you need armv8 MMU support (which is
not merged yet), so qemu can not handle guest virtual address like
0xffffffc000636498.
I just tried Peter's branch, using aarch64-qemu + aarch64-gdb to
cross-debug arm64-kernel is working here.
-- But, because aarch64 timer is not implemented in the current qemu,
thus I can not get arm64-kernel scheduler working.
Peter's branch is here:
git://git.linaro.org/people/pmaydell/qemu-arm.git
branch: a64-system
Command I am using:
1) in one terminal:
./aarch64-softmmu/qemu-system-aarch64 -kernel
../../kernel/arch/arm64/boot/Image -machine virt -cpu cortex-a57 -s -S
2) in another terminal
aarch64-linux-gnu-gdb ../../kernel/vmlinux
target remote tcp::1234
b start_kernel
On 02/27/2014 11:35 PM, Jani Kokkonen wrote:
Hi Xuebing,
In that video the qemu seems use 32-bit ARM cpu model whereas I have
need to use 64-bit ARM cpu model as I have specified by "-cpu host"
qemu parameter in Foundationv8 model.
-Jani
2014-02-27 14:21 GMT+01:00 Xuebing wang <xbi...@gmail.com
<mailto:xbi...@gmail.com>>:
Hi Jani,
Is below video similar to what you want? This video shows
cross-debug armv8 linux kernel (using armv8-gdb + armv8-qemu).
http://www.youtube.com/watch?v=MLu5EzheHIM
On 02/27/2014 05:52 PM, Peter Maydell wrote:
On 27 February 2014 09:45, Jani Kokkonen
<janimikokko...@gmail.com <mailto:janimikokko...@gmail.com>>
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
--
Thanks,
Xuebing Wang
--
Thanks,
Xuebing Wang
