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Date: Fri, 13 Sep 2002 13:11:00 -0000
From: Kevin Buettner <kevinb@redhat.com>
Message-Id: <1020913201049.ZM19442@localhost.localdomain>
In-Reply-To: Johan Walles <johan.walles@appeal.se>
        "create_new_frame() on Linux/IA64" (Sep 13,  5:17pm)
References: <3D820172.3070707@appeal.se>
To: Johan Walles <johan.walles@appeal.se>, gdb <gdb@sources.redhat.com>
Subject: Re: create_new_frame() on Linux/IA64
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X-SW-Source: 2002-09/txt/msg00162.txt.bz2

On Sep 13,  5:17pm, Johan Walles wrote:

> I'm trying to insert artificial stack frames in a backtrace using 
> create_new_frame(addr, pc) on Linux/IA64.  The pc parameter is quite 
> obvious, but what should I use for addr?

The frame pointer.  You might find the following bit from ia64-tdep.c
to be useful:

  /* We won't necessarily have a frame pointer and even if we do,
     it winds up being extraordinarly messy when attempting to find
     the frame chain.  So for the purposes of creating frames (which
     is all read_fp() is used for), simply use the stack pointer value
     instead.  */
  set_gdbarch_read_fp (gdbarch, generic_target_read_sp);

However, it turns out that this isn't really sufficient since it's
possible to leave the memory stack pointer fixed, but change the
bsp value in the register stack.  There have been some proposals
(and patches) for dealing with this.  See:

    http://sources.redhat.com/ml/gdb-patches/2002-05/msg00377.html

and the associated thread.

Kevin