Re: latest basetools build pdb cannot be load by IDA6.95

[Matthijs Lavrijsen <mattiwatti@gmail.com>]

I just compiled GenFw to verify this, and the issue is indeed caused by
e4129b0e5897d76885170bec9da996b266f185f9.

The problem is not with zeroing debug directories than the CodeView one,
but setting the 'unknown' fields of the RSDS entry to zero. These fields
are actually a GUID and DWORD respectively: the GUID identifies the PDB to
make it possible to verify that a given PDB matches the PE file, and the
DWORD is the "age" of the PDB which is simply a helper value that is
incremented by 1 by the linker every time the file is remade. Wiping the
GUID will cause PDB parsers (such as the MS DIA SDK that IDA and most other
tools use) to treat the PDB as a mismatch and refuse to load it.

W.r.t. zeroing the unwanted debug directories that were added in VS2015:
there is actually a better solution for this than plain wiping for one of
the two. It is possible to exclude IMAGE_DEBUG_TYPE_ILTCG (= 14) through
the undocumented linker flag /NOCOFFGRPINFO. This means the space is saved
even in uncompressed images. I'm not aware of any such solution for
IMAGE_DEBUG_TYPE_POGO (= 13) however, so that will still have to be zeroed.

On Tue, Aug 22, 2017 at 5:14 AM, Gao, Liming <liming.gao@intel.com> wrote:

> Xiaofeng:
>   Could you help verify the change in GenFw tool?
>
>   You can refer to https://github.com/tianocore/tianocore.github.io/wiki/
> Windows-systems Compile Tools section to compile GenFw tool, and try it.
>
> Thanks
> Liming
> From: wang xiaofeng [mailto:winggundum82@163.com]
> Sent: Tuesday, August 22, 2017 9:12 AM
> To: wang xiaofeng <winggundum82@163.com>
> Cc: Yao, Jiewen <jiewen.yao@intel.com>; Gao, Liming <liming.gao@intel.com>;
> edk2-devel@lists.01.org
> Subject: Re:Re:Re: [edk2] latest basetools build pdb cannot be load by
> IDA6.95
>
> Liming,
>       Do you think we should roll back the change? I am not sure whether
> any source level debug tool will have the same issue with pdb information
> change.
>
>
>
>
> 在 2017-08-21 17:33:30，"wang xiaofeng" <winggundum82@163.com<mailto:w
> inggundum82@163.com>> 写道：
>
> Liming,
>    It should be the change that lead to IDA cannot load pdb.  I just roll
> back to previous GENFW and IDA can load pdb file now.
>
>
>
>
>
>
> At 2017-08-21 16:29:55, "Yao, Jiewen" <jiewen.yao@intel.com<mailto:j
> iewen.yao@intel.com>> wrote:
>
> >FYI: here is IDA https://www.hex-rays.com/products/ida/overview.shtml
>
> >
>
> >Thank you
>
> >Yao Jiewen
>
> >
>
> >
>
> >From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org<mailto:edk2-
> devel-bounces@lists.01.org>] On Behalf Of Gao, Liming
>
> >Sent: Monday, August 21, 2017 4:17 PM
>
> >To: wang xiaofeng <winggundum82@163.com<mailto:winggundum82@163.com>>;
> edk2-devel@lists.01.org<mailto:edk2-devel@lists.01.org>
>
> >Subject: Re: [edk2] latest basetools build pdb cannot be load by IDA6.95
>
> >
>
> >Xiaofeng:
>
> >  What is IDA? What message is required by it?
>
> >
>
> >  Recently, I make the change in BaseTools to clear the unused field in
> DebugEntry to zero. It may impact IDA. Here is the change. Could you help
> identify whether this change cause IDA load issue?
>
> >
>
> >SHA-1: e4129b0e5897d76885170bec9da996b266f185f9
>
> >
>
> >* BaseTools: Update GenFw to clear unused debug entry generated by VS
> tool chain
>
> >
>
> >https://bugzilla.tianocore.org/show_bug.cgi?id=600
>
> >
>
> >Contributed-under: TianoCore Contribution Agreement 1.0
>
> >Signed-off-by: Liming Gao <liming.gao@intel.com<mailto:l
> iming.gao@intel.com><mailto:liming.gao@intel.com<mailto:limi
> ng.gao@intel.com>>>
>
> >Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com<mailto:
> yonghong.zhu@intel.com><mailto:yonghong.zhu@intel.com<mailto:
> yonghong.zhu@intel.com>>>
>
> >
>
> >Thanks
>
> >Liming
>
> >>-----Original Message-----
>
> >>From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org<mailto:edk2-
> devel-bounces@lists.01.org>] On Behalf Of
>
> >>wang xiaofeng
>
> >>Sent: Monday, August 21, 2017 2:27 PM
>
> >>To: edk2-devel@lists.01.org<mailto:edk2-devel@lists.01.org><mailto:
> edk2-devel@lists.01.org<mailto:edk2-devel@lists.01.org>>
>
> >>Subject: [edk2] latest basetools build pdb cannot be load by IDA6.95
>
> >>
>
> >>Hi Basetool owners,
>
> >>        I updated basetool to svn24984 (edk2 mirror )or even latest svn,
> after
>
> >>build all the x64 efi files fail to load pdb by IDA6.95. It used to work
> with
>
> >>svn23946  revision(near Feb 2017).
>
> >>       Any change may related to this issue?
>
> >>       I have reported bugs to IDA . But since this is a regression
> issue of
>
> >>basetools ,it will be helpful that basetools can also help to debug this
> issue.
>
> >>_______________________________________________
>
> >>edk2-devel mailing list
>
> >>edk2-devel@lists.01.org<mailto:edk2-devel@lists.01.org><mailto:
> edk2-devel@lists.01.org<mailto:edk2-devel@lists.01.org>>
>
> >>https://lists.01.org/mailman/listinfo/edk2-devel
>
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>
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