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    Subject[PATCH v3 2/2] scripts/gdb: Support getting current task struct in UML
    Date
    A running x86 UML kernel reports with architecture "i386:x86-64" as
    it is a sub-architecture. However, a difference with bare-metal x86
    kernels is in how it manages tasks and the current task struct. To
    identify that the inferior is a UML kernel and not bare-metal, check
    for the existence of the UML specific symbol "cpu_tasks" which
    contains the current task struct.

    Signed-off-by: Glenn Washburn <development@efficientek.com>
    Reviewed-by: Jan Kiszka <jan.kiszka@siemens.com>
    ---
    scripts/gdb/linux/cpus.py | 10 ++++++++--
    1 file changed, 8 insertions(+), 2 deletions(-)

    diff --git a/scripts/gdb/linux/cpus.py b/scripts/gdb/linux/cpus.py
    index e8d2a62ff119..255dc18cb9da 100644
    --- a/scripts/gdb/linux/cpus.py
    +++ b/scripts/gdb/linux/cpus.py
    @@ -163,8 +163,14 @@ def get_current_task(cpu):
    task_ptr_type = task_type.get_type().pointer()

    if utils.is_target_arch("x86"):
    - var_ptr = gdb.parse_and_eval("&pcpu_hot.current_task")
    - return per_cpu(var_ptr, cpu).dereference()
    + if gdb.lookup_global_symbol("cpu_tasks"):
    + # This is a UML kernel, which stores the current task
    + # differently than other x86 sub architectures
    + var_ptr = gdb.parse_and_eval("(struct task_struct *)cpu_tasks[0].task")
    + return var_ptr.dereference()
    + else:
    + var_ptr = gdb.parse_and_eval("&pcpu_hot.current_task")
    + return per_cpu(var_ptr, cpu).dereference()
    elif utils.is_target_arch("aarch64"):
    current_task_addr = gdb.parse_and_eval("$SP_EL0")
    if (current_task_addr >> 63) != 0:
    --
    2.30.2
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