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Commit cf7492e9 authored by Jan Kiszka's avatar Jan Kiszka Committed by Linus Torvalds
Browse files

scripts/gdb: add internal helper and convenience function to retrieve thread_info 



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: default avatarJan 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b24e2d21

scripts/gdb/linux/tasks.py

+35 −0
Original line number Original line Diff line number Diff line
@@ -71,3 +71,38 @@ return that task_struct variable which PID matches.""" 








LxTaskByPidFunc()

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()