blob: e2037d9bb7eb89dc8fa5b884313b7c55ed3bfb14 [file] [log] [blame]
# gdb helper commands and functions for Linux kernel debugging
# task & thread tools
# Copyright (c) Siemens AG, 2011-2013
# Authors:
# Jan Kiszka <>
# 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:
t = g = utils.container_of(g['tasks']['next'],
task_ptr_type, "tasks")
if t == init_task:
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()
raise gdb.GdbError("No task of PID " + str(pid))
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)
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
def __init__(self):
super(LxThreadInfoFunc, self).__init__("lx_thread_info")
def invoke(self, task):
return get_thread_info(task)