llvm dev - Mar 2018 - llvm pdb utility question - how to convert real address to a segmented one

I've just started using the llvm-pdbutil tool. Great job on the general
tool.

But I'm having trouble figuring out how the output of the dump tool
relates to real addresses in memory or for that matter relative
virtual address either.

Here's the logic I tried (which doesn't work):

(1) Get Instruction Pointer of interest
(2) Subtract the base address of the dll that address belongs to
(3) You now have an RVA

Use llvm-pdbutil to dump the pdb information.

The problem is I'm unable to find (or approximate) this RVA in the
dump information. The numbers in the llvm dumped files are in the form
segment:offset but even after accounting for the segment, the offsets
look way off.

Does anybody have any idea what I might be doing wrong?

I will build LLVM locally, debug and report back.

On Sat, Mar 3, 2018 at 2:47 AM, Hayden Livingston
<halivingston at gmail.com> wrote:
> I've just started using the llvm-pdbutil tool. Great job on the general
tool.
>
> But I'm having trouble figuring out how the output of the dump tool
> relates to real addresses in memory or for that matter relative
> virtual address either.
>
> Here's the logic I tried (which doesn't work):
>
> (1) Get Instruction Pointer of interest
> (2) Subtract the base address of the dll that address belongs to
> (3) You now have an RVA
>
> Use llvm-pdbutil to dump the pdb information.
>
> The problem is I'm unable to find (or approximate) this RVA in the
> dump information. The numbers in the llvm dumped files are in the form
> segment:offset but even after accounting for the segment, the offsets
> look way off.
>
> Does anybody have any idea what I might be doing wrong?

Before all that did you verify that LLVM's tool matches Microsoft's
CVDump?

LLVM's tool is still somewhat young though I haven't run into problems
recently (~ Jan 2018)


On Sat, Mar 3, 2018 at 10:34 AM, Hayden Livingston via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> I will build LLVM locally, debug and report back.
>
> On Sat, Mar 3, 2018 at 2:47 AM, Hayden Livingston
> <halivingston at gmail.com> wrote:
> > I've just started using the llvm-pdbutil tool. Great job on the
general
> tool.
> >
> > But I'm having trouble figuring out how the output of the dump
tool
> > relates to real addresses in memory or for that matter relative
> > virtual address either.
> >
> > Here's the logic I tried (which doesn't work):
> >
> > (1) Get Instruction Pointer of interest
> > (2) Subtract the base address of the dll that address belongs to
> > (3) You now have an RVA
> >
> > Use llvm-pdbutil to dump the pdb information.
> >
> > The problem is I'm unable to find (or approximate) this RVA in the
> > dump information. The numbers in the llvm dumped files are in the form
> > segment:offset but even after accounting for the segment, the offsets
> > look way off.
> >
> > Does anybody have any idea what I might be doing wrong?
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20180304/3ee456b3/attachment.html>