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From: Florian Weimer <fweimer@redhat.com>
To: "H.J. Lu" <hjl.tools@gmail.com>
Cc: Michael Matz <matz@suse.de>, gnu-gabi@sourceware.org
Subject: Re: [PATCH] Make _Unwind_GetIPInfo part of the ABI
Date: Fri, 01 Jan 2016 00:00:00 -0000	[thread overview]
Message-ID: <82ccf018-3384-2c3a-be3e-af7e171c2006@redhat.com> (raw)
In-Reply-To: <CAMe9rOoJv_zXdafKgKu81YNORrytCPXh0nQnrUZv=n3mstxs5w@mail.gmail.com>

On 10/21/2016 08:37 PM, H.J. Lu wrote:

>> It's not really clear to me how the glibc unwinders tell traps from faults.

(I meant to write “gcc unwinders”.)

> We can set signal_frame to 0 for SIGCANCEL?

No, SIGCANCEL is a signal frame for all intents in purposes.  (The bug 
was that __gcc_personality_v0 (the C unwinder) completely ignored signal 
frame hints on all architectures.)

The question if INTO should result in a signal frame.  Per Michael's 
comments, it should not because it is a trap and gets reported at the 
immediately following address (which can be in a completely different 
exception handling region).

Thanks,
Florian

  reply	other threads:[~2016-10-21 18:52 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-01-01  0:00 Florian Weimer
2016-01-01  0:00 ` Michael Matz
2016-01-01  0:00   ` Florian Weimer
2016-01-01  0:00     ` Michael Matz
2016-01-01  0:00       ` Florian Weimer
2016-01-01  0:00         ` H.J. Lu
2016-01-01  0:00           ` Florian Weimer [this message]
2016-01-01  0:00       ` Michael Matz
2016-01-01  0:00         ` Carlos O'Donell

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