9f66dee720
The tasks module already provides helpers to find the task struct by pid, and the thread_info by task struct; however this is cumbersome to utilise on the gdb commandline. Wrap these two functionalities together in an extra single helper to allow exploring the thread info, from a PID value Link: http://lkml.kernel.org/r/dadc5667f053ec811eb3e3033d99d937fedbc93b.1462865983.git.jan.kiszka@siemens.com Signed-off-by: Kieran Bingham <kieran.bingham@linaro.org> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
135 lines
3.4 KiB
Python
135 lines
3.4 KiB
Python
#
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# gdb helper commands and functions for Linux kernel debugging
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#
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# task & thread tools
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#
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# Copyright (c) Siemens AG, 2011-2013
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#
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# Authors:
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# Jan Kiszka <jan.kiszka@siemens.com>
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#
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# This work is licensed under the terms of the GNU GPL version 2.
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#
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import gdb
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from linux import utils
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task_type = utils.CachedType("struct task_struct")
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def task_lists():
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task_ptr_type = task_type.get_type().pointer()
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init_task = gdb.parse_and_eval("init_task").address
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t = g = init_task
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while True:
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while True:
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yield t
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t = utils.container_of(t['thread_group']['next'],
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task_ptr_type, "thread_group")
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if t == g:
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break
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t = g = utils.container_of(g['tasks']['next'],
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task_ptr_type, "tasks")
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if t == init_task:
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return
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def get_task_by_pid(pid):
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for task in task_lists():
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if int(task['pid']) == pid:
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return task
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return None
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class LxTaskByPidFunc(gdb.Function):
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"""Find Linux task by PID and return the task_struct variable.
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$lx_task_by_pid(PID): Given PID, iterate over all tasks of the target and
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return that task_struct variable which PID matches."""
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def __init__(self):
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super(LxTaskByPidFunc, self).__init__("lx_task_by_pid")
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def invoke(self, pid):
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task = get_task_by_pid(pid)
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if task:
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return task.dereference()
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else:
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raise gdb.GdbError("No task of PID " + str(pid))
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LxTaskByPidFunc()
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class LxPs(gdb.Command):
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"""Dump Linux tasks."""
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def __init__(self):
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super(LxPs, self).__init__("lx-ps", gdb.COMMAND_DATA)
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def invoke(self, arg, from_tty):
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for task in task_lists():
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gdb.write("{address} {pid} {comm}\n".format(
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address=task,
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pid=task["pid"],
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comm=task["comm"].string()))
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LxPs()
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thread_info_type = utils.CachedType("struct thread_info")
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ia64_task_size = None
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def get_thread_info(task):
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thread_info_ptr_type = thread_info_type.get_type().pointer()
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if utils.is_target_arch("ia64"):
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global ia64_task_size
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if ia64_task_size is None:
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ia64_task_size = gdb.parse_and_eval("sizeof(struct task_struct)")
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thread_info_addr = task.address + ia64_task_size
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thread_info = thread_info_addr.cast(thread_info_ptr_type)
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else:
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thread_info = task['stack'].cast(thread_info_ptr_type)
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return thread_info.dereference()
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class LxThreadInfoFunc (gdb.Function):
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"""Calculate Linux thread_info from task variable.
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$lx_thread_info(TASK): Given TASK, return the corresponding thread_info
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variable."""
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def __init__(self):
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super(LxThreadInfoFunc, self).__init__("lx_thread_info")
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def invoke(self, task):
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return get_thread_info(task)
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LxThreadInfoFunc()
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class LxThreadInfoByPidFunc (gdb.Function):
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"""Calculate Linux thread_info from task variable found by pid
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$lx_thread_info_by_pid(PID): Given PID, return the corresponding thread_info
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variable."""
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def __init__(self):
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super(LxThreadInfoByPidFunc, self).__init__("lx_thread_info_by_pid")
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def invoke(self, pid):
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task = get_task_by_pid(pid)
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if task:
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return get_thread_info(task.dereference())
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else:
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raise gdb.GdbError("No task of PID " + str(pid))
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LxThreadInfoByPidFunc()
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