RE: [Linux-ia64] Re: gas generates incorrect ia64 unwind rlen val

David Mosberger
2003-01-18T02:30:26Z

>>>>> On Thu, 19 Dec 2002 17:46:54 -0800, "Patil, Harish" <harish.patil@intel.com> said:

>> From: David Mosberger [mailto:davidm@napali.hpl.hp.com]
>> Sent: Thursday, December 19, 2002 3:19 PM
>> To: Patil, Harish
>> Cc: 'davidm@hpl.hp.com'; 'linux-ia64@linuxia64.org'
>> Subject: Re: [Linux-ia64] Re: gas generates incorrect ia64 unwind rlen
>> values

>> Is your script fully automatic? If so, perhaps we could add it to the
>> kernel sources and run it as part of "make check". I'd love to have
>> better unwind-info checking tools. Actually, it's even more important
>> to use such tools to verify the correctness of the user-level unwind
>> info.

Harish> Yes, the script is fully automatic and is included below (requires a
Harish> 'readelf' that understands "-u" option).

OK, I checked this script into arch/ia64/scripts/unwcheck.sh now. I
had to hack it a bit because readelf v2.13.90.0.10 generates the
code-ranges in the format:

[0xe000000004408000-0xe000000004408230],

Which isn't what the script expected.

I also fixed the handful of problems it pointed out. I agree that
those are really gas bugs (except perhaps for the unwind info in
gate.S, which was a bit clunky). But for now, I fixed things by
adding explicit nop's and commenting out .align directives. The
removal of .align may cost us a cycle or two in some routines, but I
don't it's noticable in practice.

Thanks,

--david