[Lldb-commits] [PATCH] Register Number in DWARFCallFrameInfo.cpp

Tong Shen endlessroad at google.com
Tue Aug 12 16:32:51 PDT 2014


Got it. So much magic going on there.

+Todd Can you check this in? Thanks!


On Tue, Aug 12, 2014 at 4:23 PM, Jason Molenda <jmolenda at apple.com> wrote:

>
> > On Aug 12, 2014, at 4:20 PM, Tong Shen <endlessroad at google.com> wrote:
> >
> > There's this line in your dwarfdump output:
> > DW_CFA_def_cfa (5 (esp), 4)
> > DW_CFA_offset (8 (eip), -4)
> >
> > On Ubuntu 14.04, objdump -W outputs this:
> > DW_CFA_def_cfa: r4 (esp) ofs 4
> > DW_CFA_offset: r8 (eip) at cfa-4
> >
> > I believe this is the cause. On OSX, esp=5; on linux, esp=4
>
>
> Yeah, I was starting to get that impression too.  I thought the old
> esp/ebp mixup was across all the gcc platforms - but who knows.  Feel free
> to fix the RegisterContext_x86 enum definitions for esp/ebp - on Mac OS X
> we'll still be using the debugserver-provided register definitions.  (and
> we don't use eh_frame very often on Mac OS X - we primarily use a local
> compact unwind format that I haven't written an importer for yet)
>
> Normally this kind of thing would be defined in the processor ABI document
> -- but I've never been able to find a document like that for IA-32.
>



-- 
Best Regards, Tong Shen
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