From: Florian Weimer <fw@deneb.enyo.de>
To: "H.J. Lu" <hjl.tools@gmail.com>
Cc: "Carlos O'Donell" <carlos@redhat.com>,
GNU C Library <libc-alpha@sourceware.org>
Subject: Re: [PATCH 0/2] nptl: Update struct pthread_unwind_buf
Date: Sun, 25 Feb 2018 15:13:50 +0100 [thread overview]
Message-ID: <87po4t9mxt.fsf@mid.deneb.enyo.de> (raw)
In-Reply-To: <CAMe9rOqRz=YR78QqD_EqAagZ3yr1v8jqJvn2WuF=8KCJp9csfw@mail.gmail.com> (H. J. Lu's message of "Sun, 25 Feb 2018 06:00:16 -0800")
* H. J. Lu:
> On Sun, Feb 25, 2018 at 5:49 AM, Florian Weimer <fw@deneb.enyo.de> wrote:
>> * H. J. Lu:
>>
>>> On Sun, Feb 25, 2018 at 5:31 AM, Florian Weimer <fw@deneb.enyo.de> wrote:
>>>> * H. J. Lu:
>>>>
>>>>> libpthread cancellation implementation passes cancel_jmp_buf to
>>>>> libgcc unwinder,
>>>>
>>>> Oh. Where does it do that? If you mean _Unwind_ForcedUnwind, I think
>>>> that's just an opaque closure argument for the callback.
>>>
>>> Yes. Libgcc unwinder needs to deal with it.
>>
>> Please point me to the code. Thanks.
>
> sysdeps/nptl/unwind-forcedunwind.c has
>
> _Unwind_Reason_Code
> _Unwind_ForcedUnwind (struct _Unwind_Exception *exc, _Unwind_Stop_Fn stop,
> void *stop_argument)
> {
> if (__glibc_unlikely (libgcc_s_handle == NULL))
> pthread_cancel_init ();
> else
> atomic_read_barrier ();
>
> _Unwind_Reason_Code (*forcedunwind)
> (struct _Unwind_Exception *, _Unwind_Stop_Fn, void *)
> = libgcc_s_forcedunwind;
> PTR_DEMANGLE (forcedunwind);
> return forcedunwind (exc, stop, stop_argument);
> }
Thanks. I think stop_argument ends up in the private_2 member inside
unwind.inc, which is only passed back to the callback (the stop
function pointer) in _Unwind_ForcedUnwind_Phase2, and not interpreted
by libgcc itself. So this shouldn't be a problem.
next prev parent reply other threads:[~2018-02-25 14:11 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-01 20:57 [PATCH 0/2] nptl: Update struct pthread_unwind_buf H.J. Lu
2018-02-01 20:57 ` [PATCH 1/2] Revert "Revert Intel CET changes to __jmp_buf_tag (Bug 22743)" H.J. Lu
2018-02-01 20:57 ` [PATCH 2/2] nptl: Update struct pthread_unwind_buf [BZ #22743] H.J. Lu
2018-02-08 9:25 ` [PATCH 0/2] nptl: Update struct pthread_unwind_buf Carlos O'Donell
2018-02-08 11:55 ` Florian Weimer
2018-02-09 6:29 ` Carlos O'Donell
2018-02-09 10:48 ` Florian Weimer
2018-02-09 11:13 ` H.J. Lu
2018-02-09 12:11 ` Florian Weimer
2018-02-09 12:34 ` H.J. Lu
2018-02-09 14:13 ` H.J. Lu
2018-02-09 14:33 ` Florian Weimer
2018-02-09 15:24 ` H.J. Lu
2018-02-24 5:46 ` Carlos O'Donell
2018-02-24 15:19 ` H.J. Lu
2018-02-24 15:46 ` Florian Weimer
2018-02-25 2:04 ` H.J. Lu
2018-02-25 9:26 ` Florian Weimer
2018-02-25 11:37 ` H.J. Lu
2018-02-25 11:59 ` Florian Weimer
2018-02-25 12:53 ` H.J. Lu
2018-02-25 12:55 ` H.J. Lu
2018-02-25 12:58 ` Florian Weimer
2018-02-25 13:23 ` H.J. Lu
2018-02-25 13:31 ` Florian Weimer
2018-02-25 13:36 ` H.J. Lu
2018-02-25 13:49 ` H.J. Lu
2018-02-25 13:49 ` Florian Weimer
2018-02-25 14:00 ` H.J. Lu
2018-02-25 14:13 ` Florian Weimer [this message]
2018-02-26 3:55 ` H.J. Lu
2018-02-28 23:23 ` Carlos O'Donell
2018-03-07 11:56 ` H.J. Lu
2018-03-07 17:34 ` Carlos O'Donell
2018-03-07 19:47 ` H.J. Lu
2018-03-07 20:14 ` H.J. Lu
2018-03-07 22:06 ` H.J. Lu
2018-03-08 12:24 ` Tsimbalist, Igor V
2018-03-08 12:48 ` H.J. Lu
2018-03-09 0:47 ` Carlos O'Donell
2018-03-09 5:23 ` H.J. Lu
2018-03-15 4:20 ` Carlos O'Donell
2018-02-24 6:41 ` Carlos O'Donell
2018-02-08 13:27 ` H.J. Lu
2018-02-09 6:40 ` Carlos O'Donell
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