[LLVMdev] R_ARM_ABS32 disassembly with integrated-as

[Greg Fitzgerald]

Getting closer...   When emitting symbols, how do I set the symbol's value
to the address of the current instruction?  Do I need to emit a label in
the current section and another that uses the former to point to the
latter?  If possible, a code sample would be very helpful.

And probably questions for Tim, are these "section-relative" mapping
symbols, as defined in 4.6.5.1 of the ELF for ARM document?  And what to
put in the alignment field?  I see GCC outputting 1, 3, 4, but I don't see
a description of that field in the doc.

Lastly, from MCELFStreamer, how do I determine if we generating an ARM or
Thumb ELF?  I can catch Thumb from the EmitThumbFunc, but that seems a
little odd.  Suggestions?

Here's what I have so far:

$ readelf -s via-llvm-as.o | grep "\$."
     2: 00000000     0 NOTYPE  LOCAL  DEFAULT    4 $d
     3: 00000000     0 NOTYPE  LOCAL  DEFAULT    4 $t
 $ readelf -s via-gcc-as.o | grep "\$."
     5: 00000000     0 NOTYPE  LOCAL  DEFAULT    1 $t
    15: 0000020c     0 NOTYPE  LOCAL  DEFAULT    1 $d
    17: 00000218     0 NOTYPE  LOCAL  DEFAULT    1 $t
    44: 00000732     0 NOTYPE  LOCAL  DEFAULT    1 $d
    45: 0000073e     0 NOTYPE  LOCAL  DEFAULT    1 $t
    65: 00000000     0 NOTYPE  LOCAL  DEFAULT    4 $d
    66: 00000000     0 NOTYPE  LOCAL  DEFAULT    3 $d

Thanks,
Greg


On Wed, Oct 10, 2012 at 1:08 PM, Greg Fitzgerald <garious at gmail.com> wrote:

> Great, thanks for your help.  I'll take a crack at it and contact
> Renato if I have questions.
>
> -Greg
>
>
> On Wed, Oct 10, 2012 at 1:05 PM, Jim Grosbach <grosbach at apple.com> wrote:
> > Cool; glad to help.
> >
> > When I added the data region bits, I tried to keep the ARM-style
> annotations in mind a bit, so hopefully things will fit together without
> too much trouble.
> >
> > -Jim
> >
> > On Oct 10, 2012, at 12:05 PM, Renato Golin <rengolin at systemcall.org>
> wrote:
> >
> >> Thanks Jim!
> >>
> >> I have updated the bug with your comments, I think it's a good start.
> >>
> >> Greg, let me know if that's not enough, I think I can help you from now
> on.
> >>
> >> cheers,
> >> --renato
> >>
>
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