• State Not Answered
  • Locked Locked
  • Replies 4 replies
  • Subscribers 120 subscribers
  • Views 14371 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

el2 debugging

fshark

Hi guys,

I'm trying to debug a hypervisor program at EL2 on QEMU with gdb, and a few questions coming up.

I can step thru the code at EL1 before hitting the hvc instruction, once that instruction invoked, the gdb hangs.

I read the spec, and follow the man to do the following things: pstate.d is unmasked, and mdscr_el1.kde is on, and mdcr_el2.tde is on.

Then an exception taken in el2 vec table. My question are:

Q1: Do I have to write my own debug exception handler or gdb can handle that automatically?

Q2: Is this not the properly way to debug EL2?

Q2: If I run the OS & Hypervisor on QEMU, is it possible to debug them thru DS-5? (without using Fast Model)

Thanks a lot

Parents
  • 0 Arm Employee Badge in reply to fshark

    I checked into past versions of DS-5 and even going back a few years doesn't help the problem. The best way forward may be to modify the qemu gdbserver. The error is probably not a version number, but the qemu gdbserver is reporting a packet type as unsupported.

    Just to confirm, using DS-5 with a Fast Model doesn't require any hardware or software support. The DS-5 debugger makes a direct connection to the model with full debugging.

    Thanks,

    Jason

Reply
  • 0 Arm Employee Badge in reply to fshark

    I checked into past versions of DS-5 and even going back a few years doesn't help the problem. The best way forward may be to modify the qemu gdbserver. The error is probably not a version number, but the qemu gdbserver is reporting a packet type as unsupported.

    Just to confirm, using DS-5 with a Fast Model doesn't require any hardware or software support. The DS-5 debugger makes a direct connection to the model with full debugging.

    Thanks,

    Jason

Children
No data