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-rw-r--r--scripts/gdb/linux/tasks.py100
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diff --git a/scripts/gdb/linux/tasks.py b/scripts/gdb/linux/tasks.py
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+++ b/scripts/gdb/linux/tasks.py
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+#
+# gdb helper commands and functions for Linux kernel debugging
+#
+# task & thread tools
+#
+# Copyright (c) Siemens AG, 2011-2013
+#
+# Authors:
+# Jan Kiszka <jan.kiszka@siemens.com>
+#
+# This work is licensed under the terms of the GNU GPL version 2.
+#
+
+import gdb
+
+from linux import utils
+
+
+task_type = utils.CachedType("struct task_struct")
+
+def task_lists():
+ global task_type
+ task_ptr_type = task_type.get_type().pointer()
+ init_task = gdb.parse_and_eval("init_task").address
+ t = g = init_task
+
+ while True:
+ while True:
+ yield t
+
+ t = utils.container_of(t['thread_group']['next'],
+ task_ptr_type, "thread_group")
+ if t == g:
+ break
+
+ t = g = utils.container_of(g['tasks']['next'],
+ task_ptr_type, "tasks")
+ if t == init_task:
+ return
+
+def get_task_by_pid(pid):
+ for task in task_lists():
+ if int(task['pid']) == pid:
+ return task
+ return None
+
+
+class LxTaskByPidFunc(gdb.Function):
+ """Find Linux task by PID and return the task_struct variable.
+
+$lx_task_by_pid(PID): Given PID, iterate over all tasks of the target and
+return that task_struct variable which PID matches."""
+
+ def __init__(self):
+ super(LxTaskByPidFunc, self).__init__("lx_task_by_pid")
+
+ def invoke(self, pid):
+ task = get_task_by_pid(pid)
+ if task:
+ return task.dereference()
+ else:
+ raise gdb.GdbError("No task of PID " + str(pid))
+
+
+LxTaskByPidFunc()
+
+
+thread_info_type = utils.CachedType("struct thread_info")
+
+ia64_task_size = None
+
+
+def get_thread_info(task):
+ global thread_info_type
+ thread_info_ptr_type = thread_info_type.get_type().pointer()
+ if utils.is_target_arch("ia64"):
+ global ia64_task_size
+ if ia64_task_size is None:
+ ia64_task_size = gdb.parse_and_eval("sizeof(struct task_struct)")
+ thread_info_addr = task.address + ia64_task_size
+ thread_info = thread_info_addr.cast(thread_info_ptr_type)
+ else:
+ thread_info = task['stack'].cast(thread_info_ptr_type)
+ return thread_info.dereference()
+
+
+class LxThreadInfoFunc (gdb.Function):
+ """Calculate Linux thread_info from task variable.
+
+$lx_thread_info(TASK): Given TASK, return the corresponding thread_info
+variable."""
+
+ def __init__(self):
+ super(LxThreadInfoFunc, self).__init__("lx_thread_info")
+
+ def invoke(self, task):
+ return get_thread_info(task)
+
+
+LxThreadInfoFunc()