[libunwind] Fwd: libunwind issue on x86

[David Mosberger-Tang]

Resend, now that I'm subscribed again...

  --david

---------- Forwarded message ----------
From: David Mosberger-Tang <address@hidden>
Date: Sep 14, 2005 3:42 PM
Subject: Re: libunwind issue on x86
To: address@hidden
Cc: address@hidden


Hi Saravanan,

 > This problem occurs when I unwind from a signal handler, the unwind
 > misses the last frame. I have a signal handler for SIGSEGV and this signal
 > handler will unwind and print the call sequence.

Last time I checked (which has been a couple of months), GCC did not
emit complete DWARF unwind info which effectively makes it impossible
to reliably unwind from a signal handler.  On IA64 this works because
it doesn't use DWARF unwind info.

I filed a bug-report for this a while ago:

  http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18749

Even though the report is for x86-64, it affects all platforms which
use DWARF unwind-info (i.e., pretty much everything but ia64).

  --david
--
Mosberger Consulting LLC, voice/fax: 510-744-9372,
http://www.mosberger-consulting.com/
35706 Runckel Lane, Fremont, CA 94536


-- 
Mosberger Consulting LLC, voice/fax: 510-744-9372,
http://www.mosberger-consulting.com/
35706 Runckel Lane, Fremont, CA 94536