Re: GDB can't access mapped memory

From: Tauno Voipio (
Date: 10/06/05

Date: Thu, 06 Oct 2005 20:07:52 GMT

Hans-J. Ude wrote:
> I'm writing a program which communicates with a custom PCI card and I
> need access to the card's memory. I use something like pVirt =
> mmap(...) and everything seems to work fine. The problem is that GDB
> is unable to access this pointer which is a flaw for me because i
> assign a big structure to the pointer which holds important varibles.
> Is there a way to give GDB access to that memory? I forgot to say
> that it's an i86 system and GDB version is 6.3 IIRC.

Are you talking about access in kernel or user mode?

The usual GDB cannot access kernel mode addresses, you
need the kgdb for that.

Tauno Voipio
tauno voipio (at) iki fi