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From: Fabiano Ramos <fabiano.ramos@gmail.com>
To: LKML <linux-kernel@vger.kernel.org>
Subject: pid offset into task structre
Date: Thu, 21 Oct 2004 21:34:48 -0200	[thread overview]
Message-ID: <5afb2c65041021163441c1e1b4@mail.gmail.com> (raw)

Hi All. Some newbie question.

  I am writing some assembly code where I need to access the pid that issue
a certain syscall. In entry.S,  in the syscall stub, I wrote:

   GET_THREAD_INFO(%ebp)
   movl TI_task(%ebp), %ebp
   movl PID_OFFSET(%ebp), %ebx

 Questions are:
    1) Considering that I provided the correct value in PID_OFFSET, will
ebx contain the pid of the task that issued the syscall, at the end of the
fragment?

   2)  By taking some address arithmetic (&tsk.pid - &tsk) I got 144.  Is this
offset always the same? Is that an easy way to get it directly from
assembly code?


TIA,
Fabiano

             reply	other threads:[~2004-10-21 23:37 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-10-21 23:34 Fabiano Ramos [this message]
2004-10-22 15:19 ` Vincent Hanquez

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