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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, lists
task_type = utils.CachedType("struct task_struct")
def task_lists():
task_ptr_type = task_type.get_type().pointer()
init_task = gdb.parse_and_eval("init_task").address
t = init_task
while True:
thread_head = t['signal']['thread_head']
for thread in lists.list_for_each_entry(thread_head, task_ptr_type, 'thread_node'):
yield thread
t = utils.container_of(t['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()
class LxPs(gdb.Command):
"""Dump Linux tasks."""
def __init__(self):
super(LxPs, self).__init__("lx-ps", gdb.COMMAND_DATA)
def invoke(self, arg, from_tty):
gdb.write("{:>10} {:>12} {:>7}\n".format("TASK", "PID", "COMM"))
for task in task_lists():
gdb.write("{} {:^5} {}\n".format(
task.format_string().split()[0],
task["pid"].format_string(),
task["comm"].string()))
LxPs()
thread_info_type = utils.CachedType("struct thread_info")
def get_thread_info(task):
thread_info_ptr_type = thread_info_type.get_type().pointer()
if task.type.fields()[0].type == thread_info_type.get_type():
return task['thread_info']
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()
class LxThreadInfoByPidFunc (gdb.Function):
"""Calculate Linux thread_info from task variable found by pid
$lx_thread_info_by_pid(PID): Given PID, return the corresponding thread_info
variable."""
def __init__(self):
super(LxThreadInfoByPidFunc, self).__init__("lx_thread_info_by_pid")
def invoke(self, pid):
task = get_task_by_pid(pid)
if task:
return get_thread_info(task.dereference())
else:
raise gdb.GdbError("No task of PID " + str(pid))
LxThreadInfoByPidFunc()
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