From: Daniel Jacobowitz <drow@false.org>
To: Randolph Chung <randolph@tausq.org>
Cc: gdb@sources.redhat.com
Subject: Re: dwarf2 and frame bases
Date: Thu, 11 Nov 2004 09:57:00 -0000 [thread overview]
Message-ID: <20041111030938.GA4784@nevyn.them.org> (raw)
In-Reply-To: <20041111000933.GP15714@tausq.org>
On Wed, Nov 10, 2004 at 04:09:33PM -0800, Randolph Chung wrote:
> > 'b' is in some particular frame. It's up the stack from the current
> > frame at the time of that error message, I get. So we should be
> > unwinding reg3 and using the unwound copy to determine the value of b.
> > Is the unwinding breaking?
>
> but the unwound copy is wrong too... :) i explain more below..
Then, that's a bug in the unwinder.
> r3 is also a callee-saved register, so its contents are undefined on
> entry to the function. so even if you were to unwind r3, you won't get
> the right frame base.
That's your mistake. At the first instruction of the prologue,
unwinding r3 for the previous frame should use the copy already in
r3; you need to be falling back to a prologue analyzer and cutting it
off at $pc. I thought you already were?
--
Daniel Jacobowitz
next prev parent reply other threads:[~2004-11-11 3:09 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-10 23:57 Randolph Chung
2004-11-10 23:58 ` Daniel Jacobowitz
2004-11-11 3:09 ` Randolph Chung
2004-11-11 9:57 ` Daniel Jacobowitz [this message]
2004-11-11 17:12 ` Randolph Chung
2004-11-11 19:42 ` Daniel Jacobowitz
2004-11-11 22:58 ` Randolph Chung
2004-11-11 19:47 ` Mark Kettenis
2004-11-11 21:18 ` Daniel Jacobowitz
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