From: Richard Henderson <rth@redhat.com>
To: Max Asbock <masbock@us.ibm.com>
Cc: gcc@gcc.gnu.org
Subject: Re: problems parsing dwarf frame info on amd64 optimized code
Date: Wed, 10 Mar 2004 19:41:00 -0000 [thread overview]
Message-ID: <20040310194055.GA2224@redhat.com> (raw)
In-Reply-To: <200403081044.03933.masbock@us.ibm.com>
On Mon, Mar 08, 2004 at 10:44:03AM -0800, Max Asbock wrote:
> When I turn on the -O flag things fall apart. This is with gcc 3.2.2.
> The parser finds two rules in the CIE:
> CFA_def_cfa r7+0x8 (rsp)
> CFA_offset r16 at cfa-0x8 (return address)
> and then in the FDE it finds:
> ...
> CFA_def_cfa_offset <offset>
This is correct.
> This works for stepping from the first frame to the second, but
> on the next step it fails, since the CFA is read again from r7 (rsp)
> which hasn't changed.
Huh? I think you need to provide a concrete example because what
you're saying doesn't make any sense. Particularly "stepping from
first frame to the second". There's only one frame in any function
generated by gcc...
> And it seems that the CFA <offset> is the
> offset relative to the current CFA, not relative to the value in rsp.
Incorrect.
r~
next prev parent reply other threads:[~2004-03-10 19:41 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-08 19:18 Max Asbock
2004-03-10 2:18 ` Jim Wilson
2004-03-10 19:41 ` Richard Henderson [this message]
2004-03-11 18:45 ` Max Asbock
2004-03-11 21:00 ` Richard Henderson
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