This series adds support for the multiprocess extension of the GDB remote protocol in the QEMU GDB stub.
This extension is useful to split QEMU emulated CPUs in different processes from the point of view of the GDB client. It adds the possibility to debug different kind of processors (e.g. an AArch64 and an ARMv7 CPU) at the same time (it is not possible otherwise since GDB expects an SMP view at the thread granularity. CPUs are grouped using specially named QOM containers. CPUs that are children of such a container are grouped under the same GDB process. The last patch groups the CPUs of different model in the zynqmp machines into separate processes. To test this patchset, you can use the following commands: (Note that this requires a recent enough GDB, I think GDB 7.2 is OK. Also, it must be compiled to support both ARM and AArch64 architectures) Run QEMU: (-smp 6 in xlnx-zcu102 enables both cortex-a53 and cortex-r5 CPUs) qemu-system-aarch64 -M xlnx-zcu102 -gdb tcp::1234 -S -smp 6 Run the following commands in GDB: target extended :1234 add-inferior inferior 2 attach 2 info threads I want to thanks the Xilinx's QEMU team who sponsored this work for their collaboration and their prototype implementation. Luc Michel (15): gdbstub: introduce GDB processes gdbstub: add multiprocess support to '?' packets gdbstub: add multiprocess support to 'H' and 'T' packets gdbstub: add multiprocess support to vCont packets gdbstub: add multiprocess support to 'sC' packets gdbstub: add multiprocess support to (f|s)ThreadInfo and ThreadExtraInfo gdbstub: add multiprocess support to Xfer:features:read: gdbstub: add multiprocess support to gdb_vm_state_change() gdbstub: add multiprocess support to 'D' packets gdbstub: add support for extended mode packet gdbstub: add support for vAttach packets gdbstub: processes initialization on new peer connection gdbstub: gdb_set_stop_cpu: ignore request when process is not attached gdbstub: add multiprocess extension support arm/xlnx-zynqmp: put APUs and RPUs in separate GDB groups include/exec/gdbstub.h | 8 + gdbstub.c | 584 +++++++++++++++++++++++++++++++++++------ hw/arm/xlnx-zynqmp.c | 7 +- 3 files changed, 521 insertions(+), 78 deletions(-) -- 2.18.0