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Re: what is the function of EXCEPTIONS_SIGLONGJMP?
On Thu, 13 Sep 2012 11:55:34 +0200, John Smith wrote:
> when I debug gdb using gdb self , after I type "start" command ,
> the prompt is as below :
> Warning:
> Cannot insert breakpoint 0.
> Error accessing memory address 0xdb6a5194: /.
> 0xb7589571 in siglongjmp () from /lib/i686/cmov/libc.so.6
>
> it seem to be some exceptions happened when dealing with break points .
You are trying to step over longjmp or siglongjmp call. This is supported
only with SystemTap-extended glibc, this is implemented only in recent glibc
and recent GDB. Recent Fedora releases also have it working.
glibc/
commit 8422c9a560e6e3c854739c8a13ecb1c6714f930f
Author: Roland McGrath <roland@hack.frob.com>
Date: Fri May 25 13:31:57 2012 -0700
Add systemtap static probe points in setjmp/longjmp on x86.
gdb/
commit 014135139c612fe1fbe6f11d2350f72325a66f7c
Author: sergiodj <sergiodj>
Date: Fri Apr 27 20:48:52 2012 +0000
2012-04-27 Sergio Durigan Junior <sergiodj@redhat.com>
Tom Tromey <tromey@redhat.com>
I just do not understand how that can happen during 'start' command, 'start'
is just doing 'tbreak' and 'run', there is no stepping involved anywhere.
Regards,
Jan