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authorGlenn Washburn <development@efficientek.com>2023-02-26 22:06:00 -0600
committerAndrew Morton <akpm@linux-foundation.org>2023-04-08 13:45:37 -0700
commit6d51363d53db4f5f11a13509ef28e917b97eb2b3 (patch)
treeaca648142b64493b1b1dc8819c15d726e17d28c3 /scripts/gdb
parent56fe487062b5561ceabb9f866327cd0b041f3a09 (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 <development@efficientek.com> Reviewed-by: Jan Kiszka <jan.kiszka@siemens.com> Cc: Anton Ivanov <anton.ivanov@kot-begemot.co.uk> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: Kieran Bingham <kbingham@kernel.org> Cc: Richard Weinberger <richard@nod.at> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'scripts/gdb')
-rw-r--r--scripts/gdb/linux/cpus.py10
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: