llvm dev - Sep 2016 - GlobalVariable to image base

For x86-win32 we got __ImageBase,
Is there any *simple* way to create a GlobalVariable pointing to the image
base on all platforms?
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On Sat, Sep 03, 2016 at 05:05:32PM +0300, BBLN via llvm-dev
wrote:
> For x86-win32 we got __ImageBase,
> Is there any *simple* way to create a GlobalVariable pointing to the image
> base on all platforms?
What is an image base?

Joerg

Image base is the PE/COFF base address (the relocated one) - pointer to
header.
In ELF the PIC calculations use PC + offset to GOT, so the image base would
be actually PC minus assumed PC offset, or GOT minus assumed GOT offset
(offset taken from the ELF header)

I guess that could be easy calculated using MachineInstruction. Just
thinking if something can be done using IR and GlobalVariables..

2016-09-03 18:21 GMT+03:00 Joerg Sonnenberger via llvm-dev <
llvm-dev at lists.llvm.org>:
> On Sat, Sep 03, 2016 at 05:05:32PM +0300, BBLN via llvm-dev wrote:
> > For x86-win32 we got __ImageBase,
> > Is there any *simple* way to create a GlobalVariable pointing to the
> image
> > base on all platforms?
>
> What is an image base?
>
> Joerg
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
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I don't think there's an easy way for all platforms. Try
__executable_start
for ELF, though.

On Sat, Sep 3, 2016 at 7:05 AM, BBLN via llvm-dev <llvm-dev at
lists.llvm.org>
wrote:
> For x86-win32 we got __ImageBase,
> Is there any *simple* way to create a GlobalVariable pointing to the image
> base on all platforms?
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
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