[PATCH v4 10/13] scripts/gdb: Add internal helper and convenience function to retrieve thread_info

Jan Kiszka
2013-01-21T17:24:50Z

Add the internal helper get_thread_info that calculated the thread_info
from a given task variable. Also export this service as a convenience
function.

Note: ia64 version is untested.

CC: Tony Luck <tony.luck@intel.com>
CC: Fenghua Yu <fenghua.yu@intel.com>
CC: linux-ia64@vger.kernel.org
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
scripts/gdb/task.py | 39 +++++++++++++++++++++++++++++++++++++++
1 files changed, 39 insertions(+), 0 deletions(-)

diff --git a/scripts/gdb/task.py b/scripts/gdb/task.py
index 93e6c0c..0a45b3c 100644
--- a/scripts/gdb/task.py
+++ b/scripts/gdb/task.py
@@ -67,3 +67,42 @@ class LxTaskByPidFunc(gdb.Function):
raise gdb.GdbError("No task of PID " + str(pid))

LxTaskByPidFunc()
+
+
+thread_info_ptr_type = None
+
+def get_thread_info_ptr_type():
+ global thread_info_ptr_type
+ if thread_info_ptr_type == None:
+ thread_info_ptr_type = get_type('struct thread_info').pointer()
+ return thread_info_ptr_type
+
+ia64_task_size = None
+
+def get_thread_info(task):
+ if is_target_arch("ia64"):
+ global ia64_task_size
+ if ia64_task_size == None:
+ ia64_task_size = gdb.parse_and_eval(
+ "sizeof(struct task_struct)")
+ thread_info_addr = task.address + ia64_task_size
+ thread_info = thread_info_addr.cast(get_thread_info_ptr_type())
+ else:
+ thread_info = task['stack'].cast(get_thread_info_ptr_type())
+ return thread_info.dereference()
+
+
+class LxThreadInfoFunc (gdb.Function):
+ # Calculate Linux thread_info from task variable.
+ __doc__ = "Calculate Linux thread_info from task variable.\n" \
+ "\n" \
+ "$lx_thread_info(TASK): Given TASK, return the corresponding thread_info\n" \
+ "variable.\n"
+
+ def __init__(self):
+ super(LxThreadInfoFunc, self).__init__("lx_thread_info")
+
+ def invoke(self, task):
+ return get_thread_info(task)
+
+LxThreadInfoFunc()
--
1.7.3.4