Re: Fwd: [PATCH 0/3] perf tools: Add libdw DWARF post unwind support for ARM64

[Mark Wielaard <mjw at redhat dot com>]

Hi Jean,

On Wed, 2014-03-19 at 11:58 +0100, Jean Pihet wrote:
> On 19 March 2014 11:46, Mark Wielaard <mjw@redhat.com> wrote:
> Do you have an idea what/where to check for libdw compat support? I
> just quickly browsed through the code and found the uses of the
> ELFCLASS32/ELFCLASS64 macros interesting.

In theory it should "just work" assuming arm32 as native arch works.
Normally elfutils/libdwfl uses the backend that matches the ELF
header/EM value used. The only issue is that for arm32 only .debug_frame
is supported and not EXIDX tables (as .eh_frame isn't used on arm32).
But I believe that isn't an issue in your case because you require the
debuginfo to be available.

If you were using the mjw/aarch64-unwind branch you might have missed
various patches for arm32 support since that branch was fairly old. I
have rebased the branch on current master now.

> Do you need testing etc. in order to be able to merge the aarch64
> branch? Please let me know!

The system I am testing on is missing various glibc fixes, in particular
https://sourceware.org/bugzilla/show_bug.cgi?id=16169 and gcc doesn't
use -fasynchronous-unwind-tables by default. So the make check results
are not reliable for me.

If you can run make check on the rebased branch on your setup that would
be helpful. Ideally all tests PASS. If not, the output of
tests/test-suite.log would be interesting.

Thanks,

Mark