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Re: Variable locations in a loaded kernel (bsd.gdb)
- To: Joshua Lamorie <jpl at xiphos dot ca>
- Subject: Re: Variable locations in a loaded kernel (bsd.gdb)
- From: Andrew Cagney <ac131313 at cygnus dot com>
- Date: Mon, 27 Aug 2001 13:48:45 -0400
- Cc: gdb at sourceware dot cygnus dot com
- References: <Pine.LNX.4.10.10108271155200.8901-100000@verne.xiphos.ca>
> Gidday there,
>
> I'm trying to find how a specific variable is referenced in an
> OpenBSD 2.8 kernel. I build a kernel with symbols, and load it into gdb,
> however I can't find a way to see where a specific variable is stored
> (stack, memory, register etc...). I can't run the kernel, and when I type
> 'p function::variable' it responds with...
>
> No frame is currently executing in block scpshc_decompress.
>
> Once I have the offset, or address or whatever about the variable,
> then I can examine its value in 'ddb' after the kernel crashes.
>
> Thanks in advance. I'm running GDB 4.16.1. The 'configure'
> script doesn't let me compile version 5 on OBSD2.8.
Outch! They are both really old GDBs. Could I sugest downloading
someting more recent? The snapshots are tracking the unreleased 5.1 branch:
http://sources.redhat.com/gdb/download
Hopefully that at least builds (Changes to get GDB working on the
various BSD OSs were only committed after GDB 5 was released).
Having done this, I would add a note of caution. 4.16.1 as a GDB
version number makes me suspicious - afaik it doesn't exist! I suspect
it is in fact 4.16ob1 - an OpenBSD specific branch of GDB - and may
contain features never contributed to the FSF.
Andrew