diff options
| author | Glenn Washburn <[email protected]> | 2023-02-26 22:06:00 -0600 |
|---|---|---|
| committer | Andrew Morton <[email protected]> | 2023-04-08 13:45:37 -0700 |
| commit | 6d51363d53db4f5f11a13509ef28e917b97eb2b3 (patch) | |
| tree | aca648142b64493b1b1dc8819c15d726e17d28c3 | |
| parent | 56fe487062b5561ceabb9f866327cd0b041f3a09 (diff) | |
scripts/gdb: support getting current task struct in UML
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.
Link: https://lkml.kernel.org/r/b839d611e2906ccef2725c34d8e353fab35fe75e.1677469905.git.development@efficientek.com
Signed-off-by: Glenn Washburn <[email protected]>
Reviewed-by: Jan Kiszka <[email protected]>
Cc: Anton Ivanov <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: Kieran Bingham <[email protected]>
Cc: Richard Weinberger <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
| -rw-r--r-- | scripts/gdb/linux/cpus.py | 10 |
1 files 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: |