forked from mirrors/linux
cf7492e933
Add the internal helper get_thread_info that calculates the thread_info from a given task variable. Also export this service as a convenience function. Note: ia64 version is untested. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jason Wessel <jason.wessel@windriver.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Ben Widawsky <ben@bwidawsk.net> Cc: Borislav Petkov <bp@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
108 lines
2.8 KiB
Python
108 lines
2.8 KiB
Python
#
|
|
# 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")
|
|
|
|
|
|
class TaskList:
|
|
def __init__(self):
|
|
global task_type
|
|
self.task_ptr_type = task_type.get_type().pointer()
|
|
self.init_task = gdb.parse_and_eval("init_task")
|
|
self.curr_group = self.init_task.address
|
|
self.curr_task = None
|
|
|
|
def __iter__(self):
|
|
return self
|
|
|
|
def next(self):
|
|
t = self.curr_task
|
|
if not t or t == self.curr_group:
|
|
self.curr_group = \
|
|
utils.container_of(self.curr_group['tasks']['next'],
|
|
self.task_ptr_type, "tasks")
|
|
if self.curr_group == self.init_task.address:
|
|
raise StopIteration
|
|
t = self.curr_task = self.curr_group
|
|
else:
|
|
self.curr_task = \
|
|
utils.container_of(t['thread_group']['next'],
|
|
self.task_ptr_type, "thread_group")
|
|
return t
|
|
|
|
|
|
def get_task_by_pid(pid):
|
|
for task in TaskList():
|
|
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()
|