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Re: [rfa] Fix software-watchpoint failures by adding epilogue detection
- From: "Ulrich Weigand" <uweigand at de dot ibm dot com>
- To: dan at codesourcery dot com (Daniel Jacobowitz)
- Cc: gdb-patches at sourceware dot org, rearnsha at arm dot com
- Date: Thu, 23 Sep 2010 15:00:34 +0200 (CEST)
- Subject: Re: [rfa] Fix software-watchpoint failures by adding epilogue detection
Dan Jacobowitz wrote:
> One of the patches we haven't had a chance to submit took the same
> approach to solve these failures. I also did ARM mode, as well as
> some additional sequences - probably those used by RealView. I've
> attached it.
Thanks! Unfortunately it doesn't fix the problem with our current
ARM compiler, because your heuristics doesn't recognize the sequence
we get as epilogue:
83c8: f107 0710 add.w r7, r7, #16
83cc: 46bd mov sp, r7
83ce: bd80 pop {r7, pc}
On the other hand, your patch does indeed accept a couple of additonal
instructions compared to mine. I'll come up with a merged approach ...
> We have at least one other patch related to ARM testsuite failures,
> specifically an ERROR (probably infinite backtrace) in gdb1250.exp.
> I can extract it for you if you'd like, but I'm not sure it's in
> condition to be merged.
Hmm, this test is passing now. We did have problems with backtraces
out of abort, but this was due to a compiler problem -- it simply
would not save the return address at all for no-return functions.
This is now fixed in the compiler ...
Bye,
Ulrich
--
Dr. Ulrich Weigand
GNU Toolchain for Linux on System z and Cell BE
Ulrich.Weigand@de.ibm.com