Messages in this thread Patch in this message | | | From | Glenn Washburn <> | Subject | [PATCH v2 2/2] scripts/gdb: Support getting current task struct in UML | Date | Fri, 17 Feb 2023 19:11:54 -0600 |
| |
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 3e02a1866751..4b4ce6464dee 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("¤t_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("¤t_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
| |