From: Corey Minyard <minyard@acm.org>
To: kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
Vivek Goyal <vgoyal@redhat.com>, Haren Myneni <hbabu@us.ibm.com>
Cc: Corey Minyard <cminyard@mvista.com>
Subject: Re: [PATCH] kdump: Fix gdb macros work work with newer and 64-bit kernels
Date: Wed, 27 Apr 2016 07:21:48 -0500 [thread overview]
Message-ID: <5720AEDC.3080409@acm.org> (raw)
In-Reply-To: <1456408291-29559-1-git-send-email-minyard@acm.org>
Any comments on this? If no one else cares I'd be willing to take over
maintenance of this.
-corey
On 02/25/2016 07:51 AM, minyard@acm.org wrote:
> From: Corey Minyard <cminyard@mvista.com>
>
> Lots of little changes needed to be made to clean these up, remove the
> four byte pointer assumption and traverse the pid queue properly.
> Also consolidate the traceback code into a single function instead
> of having three copies of it.
>
> Signed-off-by: Corey Minyard <cminyard@mvista.com>
> ---
> Documentation/kdump/gdbmacros.txt | 90 +++++++++++++++++----------------------
> 1 file changed, 40 insertions(+), 50 deletions(-)
>
> I sent this earlier, but I didn't get a response. These are clearly
> wrong. I'd be happy to take over maintenance of these macros. It
> might be better to move them someplace else, too, since they are also
> useful for kgdb.
>
> diff --git a/Documentation/kdump/gdbmacros.txt b/Documentation/kdump/gdbmacros.txt
> index 9b9b454..e5bbd8d 100644
> --- a/Documentation/kdump/gdbmacros.txt
> +++ b/Documentation/kdump/gdbmacros.txt
> @@ -15,14 +15,14 @@
>
> define bttnobp
> set $tasks_off=((size_t)&((struct task_struct *)0)->tasks)
> - set $pid_off=((size_t)&((struct task_struct *)0)->pids[1].pid_list.next)
> + set $pid_off=((size_t)&((struct task_struct *)0)->thread_group.next)
> set $init_t=&init_task
> set $next_t=(((char *)($init_t->tasks).next) - $tasks_off)
> while ($next_t != $init_t)
> set $next_t=(struct task_struct *)$next_t
> printf "\npid %d; comm %s:\n", $next_t.pid, $next_t.comm
> printf "===================\n"
> - set var $stackp = $next_t.thread.esp
> + set var $stackp = $next_t.thread.sp
> set var $stack_top = ($stackp & ~4095) + 4096
>
> while ($stackp < $stack_top)
> @@ -31,12 +31,12 @@ define bttnobp
> end
> set $stackp += 4
> end
> - set $next_th=(((char *)$next_t->pids[1].pid_list.next) - $pid_off)
> + set $next_th=(((char *)$next_t->thread_group.next) - $pid_off)
> while ($next_th != $next_t)
> set $next_th=(struct task_struct *)$next_th
> printf "\npid %d; comm %s:\n", $next_t.pid, $next_t.comm
> printf "===================\n"
> - set var $stackp = $next_t.thread.esp
> + set var $stackp = $next_t.thread.sp
> set var $stack_top = ($stackp & ~4095) + 4096
>
> while ($stackp < $stack_top)
> @@ -45,7 +45,7 @@ define bttnobp
> end
> set $stackp += 4
> end
> - set $next_th=(((char *)$next_th->pids[1].pid_list.next) - $pid_off)
> + set $next_th=(((char *)$next_th->thread_group.next) - $pid_off)
> end
> set $next_t=(char *)($next_t->tasks.next) - $tasks_off
> end
> @@ -54,42 +54,43 @@ document bttnobp
> dump all thread stack traces on a kernel compiled with !CONFIG_FRAME_POINTER
> end
>
> +define btthreadstruct
> + set var $pid_task = $arg0
> +
> + printf "\npid %d; comm %s:\n", $pid_task.pid, $pid_task.comm
> + printf "task struct: "
> + print $pid_task
> + printf "===================\n"
> + set var $stackp = $pid_task.thread.sp
> + set var $stack_top = ($stackp & ~4095) + 4096
> + set var $stack_bot = ($stackp & ~4095)
> +
> + set $stackp = *((unsigned long *) $stackp)
> + while (($stackp < $stack_top) && ($stackp > $stack_bot))
> + set var $addr = *(((unsigned long *) $stackp) + 1)
> + info symbol $addr
> + set $stackp = *((unsigned long *) $stackp)
> + end
> +end
> +document btthreadstruct
> + dump a thread stack using the given task structure pointer
> +end
> +
> +
> define btt
> set $tasks_off=((size_t)&((struct task_struct *)0)->tasks)
> - set $pid_off=((size_t)&((struct task_struct *)0)->pids[1].pid_list.next)
> + set $pid_off=((size_t)&((struct task_struct *)0)->thread_group.next)
> set $init_t=&init_task
> set $next_t=(((char *)($init_t->tasks).next) - $tasks_off)
> while ($next_t != $init_t)
> set $next_t=(struct task_struct *)$next_t
> - printf "\npid %d; comm %s:\n", $next_t.pid, $next_t.comm
> - printf "===================\n"
> - set var $stackp = $next_t.thread.esp
> - set var $stack_top = ($stackp & ~4095) + 4096
> - set var $stack_bot = ($stackp & ~4095)
> + btthreadstruct $next_t
>
> - set $stackp = *($stackp)
> - while (($stackp < $stack_top) && ($stackp > $stack_bot))
> - set var $addr = *($stackp + 4)
> - info symbol $addr
> - set $stackp = *($stackp)
> - end
> -
> - set $next_th=(((char *)$next_t->pids[1].pid_list.next) - $pid_off)
> + set $next_th=(((char *)$next_t->thread_group.next) - $pid_off)
> while ($next_th != $next_t)
> set $next_th=(struct task_struct *)$next_th
> - printf "\npid %d; comm %s:\n", $next_t.pid, $next_t.comm
> - printf "===================\n"
> - set var $stackp = $next_t.thread.esp
> - set var $stack_top = ($stackp & ~4095) + 4096
> - set var $stack_bot = ($stackp & ~4095)
> -
> - set $stackp = *($stackp)
> - while (($stackp < $stack_top) && ($stackp > $stack_bot))
> - set var $addr = *($stackp + 4)
> - info symbol $addr
> - set $stackp = *($stackp)
> - end
> - set $next_th=(((char *)$next_th->pids[1].pid_list.next) - $pid_off)
> + btthreadstruct $next_th
> + set $next_th=(((char *)$next_th->thread_group.next) - $pid_off)
> end
> set $next_t=(char *)($next_t->tasks.next) - $tasks_off
> end
> @@ -101,7 +102,7 @@ end
> define btpid
> set var $pid = $arg0
> set $tasks_off=((size_t)&((struct task_struct *)0)->tasks)
> - set $pid_off=((size_t)&((struct task_struct *)0)->pids[1].pid_list.next)
> + set $pid_off=((size_t)&((struct task_struct *)0)->thread_group.next)
> set $init_t=&init_task
> set $next_t=(((char *)($init_t->tasks).next) - $tasks_off)
> set var $pid_task = 0
> @@ -113,29 +114,18 @@ define btpid
> set $pid_task = $next_t
> end
>
> - set $next_th=(((char *)$next_t->pids[1].pid_list.next) - $pid_off)
> + set $next_th=(((char *)$next_t->thread_group.next) - $pid_off)
> while ($next_th != $next_t)
> set $next_th=(struct task_struct *)$next_th
> if ($next_th.pid == $pid)
> set $pid_task = $next_th
> end
> - set $next_th=(((char *)$next_th->pids[1].pid_list.next) - $pid_off)
> + set $next_th=(((char *)$next_th->thread_group.next) - $pid_off)
> end
> set $next_t=(char *)($next_t->tasks.next) - $tasks_off
> end
>
> - printf "\npid %d; comm %s:\n", $pid_task.pid, $pid_task.comm
> - printf "===================\n"
> - set var $stackp = $pid_task.thread.esp
> - set var $stack_top = ($stackp & ~4095) + 4096
> - set var $stack_bot = ($stackp & ~4095)
> -
> - set $stackp = *($stackp)
> - while (($stackp < $stack_top) && ($stackp > $stack_bot))
> - set var $addr = *($stackp + 4)
> - info symbol $addr
> - set $stackp = *($stackp)
> - end
> + btthreadstruct $pid_task
> end
> document btpid
> backtrace of pid
> @@ -145,7 +135,7 @@ end
> define trapinfo
> set var $pid = $arg0
> set $tasks_off=((size_t)&((struct task_struct *)0)->tasks)
> - set $pid_off=((size_t)&((struct task_struct *)0)->pids[1].pid_list.next)
> + set $pid_off=((size_t)&((struct task_struct *)0)->thread_group.next)
> set $init_t=&init_task
> set $next_t=(((char *)($init_t->tasks).next) - $tasks_off)
> set var $pid_task = 0
> @@ -157,13 +147,13 @@ define trapinfo
> set $pid_task = $next_t
> end
>
> - set $next_th=(((char *)$next_t->pids[1].pid_list.next) - $pid_off)
> + set $next_th=(((char *)$next_t->thread_group.next) - $pid_off)
> while ($next_th != $next_t)
> set $next_th=(struct task_struct *)$next_th
> if ($next_th.pid == $pid)
> set $pid_task = $next_th
> end
> - set $next_th=(((char *)$next_th->pids[1].pid_list.next) - $pid_off)
> + set $next_th=(((char *)$next_th->thread_group.next) - $pid_off)
> end
> set $next_t=(char *)($next_t->tasks.next) - $tasks_off
> end
next prev parent reply other threads:[~2016-04-27 12:21 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-25 13:51 [PATCH] kdump: Fix gdb macros work work with newer and 64-bit kernels minyard
2016-04-27 12:21 ` Corey Minyard [this message]
2016-05-05 2:37 ` Baoquan He
2016-05-09 5:18 ` Baoquan He
2016-05-09 12:10 ` Corey Minyard
2016-05-09 14:29 ` Baoquan He
2016-05-09 15:40 ` Corey Minyard
2016-05-10 1:37 ` Baoquan He
2016-05-10 1:48 ` Baoquan He
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