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Re: [Libunwind-devel] Port fasttrace to x86

From: Konstantin Belousov
Subject: Re: [Libunwind-devel] Port fasttrace to x86
Date: Fri, 11 Nov 2011 19:15:50 +0200
User-agent: Mutt/

On Fri, Nov 11, 2011 at 01:40:52PM +0100, Lassi Tuura wrote:
> Hi Paul,
> > Attached patch almost entirely mechanically copies x86_64/Gtrace.c and
> > x86_64/Gstash_frame.c to x86.
> Nice, thanks for doing the port. It looks mostly fine to me, some notes
> below. We don't use 32-bit any more, so it kind of fell off my radar, and
> I don't really have an environment to even test these. I was mainly
> concerned there are too many real-life systems with poor signal stack
> annotations in x86 world, or some other simplifying assumptions broke.
> These are not an issue with x86_64 - and I don't really have access to
> anything but recent distributions where this probably isn't an issue.
> The notes:
> * There are a few instances of 'rbp', 'rsp', 'RBP', 'RSP' in comments in
> include/tdep-x86/libunwind_i.h and src/x86/Gtrace.c you might edit.
> * It seems you use LINUX_SC_EIP_OFF etc. I think this code is also used
> on FreeBSD, so I am not sure if there will be problems with that. Maybe
> Konstantin could confirm that for you?
Well, I will fix the breakage if the submitter care only about Linux,
either before or after the patch is committed.
I prefer to do it after the commit, since then I am sure that I handle
the latest version.

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