<div dir="ltr">Wow ... I did a git pull on llvm and clang compiled my c file <div>clang  -target thumbv7-windows -c  -O0  a.c -oa.obj<br></div><div>dumpbin /all on a.obj now shows "thumb instructions" ..... I'll try running this tomorrow and post back.</div>
<div><br></div><div>Regards,</div><div>Kashyap</div><div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sun, Jun 8, 2014 at 9:39 AM, Saleem Abdulrasool <span dir="ltr"><<a href="mailto:compnerd@compnerd.org" target="_blank">compnerd@compnerd.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><div class="">On Sat, Jun 7, 2014 at 8:03 PM, C K Kashyap <span dir="ltr"><<a href="mailto:ckkashyap@gmail.com" target="_blank">ckkashyap@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr">Thank you so much Saleem,<div>The target is Windows phone 8.1 (ARM). I'll update the crash details tomorrow. </div>
</div></blockquote><div><br></div></div><div>Please rebuild the tree after SVN r210415Â when you test it again. Â It seems that link.exe needs the IMAGE_SCN_MEM_16BIT set in order to select the function as a thumb function rather than silently assuming that all functions are thumb (which was something that I suspected but hadn't tested since I haven't been using that linker for my testing).</div>
<div><br></div><div>If you were seeing an "Invalid Instruction" exception, that was caused by the application switching into ARM mode execution (rather than staying in thumb mode as it should).</div><div><br></div>
<div>Please let met know what the result is with your test, as I do want to ensure that this does play well with the Visual Studio toolchain.</div><div class=""><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div dir="ltr"><div>One big problem is that I have to use a physical windows phone for execution. </div></div></blockquote><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div dir="ltr"><div>I wonder if it is possible to execute such "exes" using qemu.</div></div></blockquote><div><br></div></div><div>Please let me know if you get that to work somehow (I don't know if there is a way to do that currently).</div>
<div><div class="h5">
<div>Â </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr">
<div>Regards,</div><div>Kashyap</div><div><br></div></div><div><div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sun, Jun 8, 2014 at 2:53 AM, Saleem Abdulrasool <span dir="ltr"><<a href="mailto:compnerd@compnerd.org" target="_blank">compnerd@compnerd.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div>On Sat, Jun 7, 2014 at 10:06 AM, C K Kashyap <span dir="ltr"><<a href="mailto:ckkashyap@gmail.com" target="_blank">ckkashyap@gmail.com</a>></span> wrote:<br>
</div><div class="gmail_extra"><div class="gmail_quote"><div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr">Hi Saleem,<div>I have a similar situation - I'd appreciate your inputs on it. I noticed that the obj file generated using llvm does not contain "thumb" instructions. I suspect that is what is causing runtime crash for me.</div>
<div><br></div><div><br></div><div>Here's what I've tried -</div><div>Start with a.c (on my linux machine where I have llvm/clang built as of yesterday)Â </div><div><div>Â Â Â Â Â Â Â Â Â Â Â int add(int i, int j) {int k = i + j; return k; }</div>
</div><div><div>clang  -S  -O0  a.c</div></div></div></blockquote><div><br></div></div><div>This targets the default target, which may not necessarily be the target that you want.</div><div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div dir="ltr"><div><div>llc -filetype=obj -mtriple=thumbv7-windows -O0 a.ll</div></div></div></blockquote><div><br></div></div><div>This is a bit round-about to generate the object-file.</div><div><br></div><div>You can actually generate the object file directly from clang at this point, which may not have been the case when you first started looking at this.</div>
<div><br></div><div>$ clang -target armv7-windows -c a.c -o a.obj</div><div><br></div><div>If you look at the generated assembly, you will find that it will generate a thumb function, even though the object file may be missing the appropriate flag in the case of the public llvm repository (Ill look into that btw).</div>
<div>
<div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div>I get a.obj from the above steps.</div>
<div><br></div><div>I take this a.obj over to my windows 8.1 machine where I have VS2013 update 2 installed</div>
<div><br></div><div>I open up a command window and run </div><div><div>C:\Users\kck\arm>"c:\Program Files (x86)\Microsoft Visual Studio 12.0\vc\bin\x86_arm\vcvarsx86_arm.bat"</div></div><div><br></div><div>I create a file file m.c </div>
<div><div>int main() { return add(20,30);}</div></div></div></blockquote><div><br></div></div><div>This might cause an issue. Â You are not providing a declaration for the symbol. Â If cl ends up converting it to a dllimport'ed symbol, the generated application will not execute.</div>
<div>
<div>Â </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div>I build the whole thing like this -</div>
<div><br></div><div>cl m.c a.obj</div></div></blockquote><div><br></div></div><div>That seems right; I will note that all my testing with cl has been with /MD.</div><div><div>Â </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div dir="ltr"><div>Things seem  to work fine and m.exe gets generated.</div>
<div><br></div><div>However I noticed a difference in the dumpbin output for a.obj and m.obj - In m.obj, I can see "Thumb instructions" where as in a.obj, I don't see that.</div></div></blockquote><div><br>
</div></div><div>I'll look into that, but, I suspect that this is not the cause of the crash.</div><div><div>Â </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div dir="ltr"><div>I'd appreciate any pointers on this.</div></div></blockquote><div><br></div></div><div>Can you specify what the target environment is? Â (Device, Windows version, etc).</div><div><br></div><div>Actual details of the crash may also be relevant. Â Also of interest would be how you are loading the generated binary onto the device. Â The only way that I know of accomplishing that involves the use of Visual Studio's remote debugging functionality.</div>
<div><div>
<div>Â </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div>Regards,</div><div>Kashyap</div>
<div><br></div><div><br></div><div><br></div><div><br></div></div><div><div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, May 30, 2014 at 10:45 PM, Saleem Abdulrasool <span dir="ltr"><<a href="mailto:abdulras@fb.com" target="_blank">abdulras@fb.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div><br>
On May 28, 2014, at 5:18 AM, Rajat Mahajan <<a href="mailto:rmahajan@adobe.com" target="_blank">rmahajan@adobe.com</a>> wrote:<br>
<br>
> I am talking about Windows Mobile 8 and 8.1 and not CE.<br>
> Not sure though that the Windows 8 (ARM NT) is similar to Windows Mobile 8 platform.<br>
><br>
> I used the following command to generate the obj file<br>
>   Llc.exe -mtriple=thumbv7-windows  -filetype=obj  <some_name>.bc<br>
><br>
> The object file generated in the above object doesn't get linked when I try to link it with the windows mobile library as it fails to recognize the object format. Â ( Not a valid object file )<br>
><br>
> Hope I am clear.<br>
<br>
</div>Unfortunately, you have merely repeated your previous statement.  I don’t have enough here to diagnose nor even speculate what is going on.<br>
<br>
If you can provide the object file, it would be helpful as I am unable to reproduce this issue. Â Although, I ran it via clang, I see no reason that the output would be different as the backend is the same.<br>
<br>
The triple is certainly correct (particularly for llc, clang will treat armv7-windows as thumbv7-windows).  How did you generate the bit code?  My testing has usually started from C or LLVM IR rather than bit code, but, I suspect that shouldn’t be a real issue.<br>
<br>
With the given information, the only thing that comes to mind is that your environment is setup improperly, resulting in the wrong link.exe being invoked.<br>
<div><div><br>
> ~rajat<br>
><br>
> -----Original Message-----<br>
> From: Saleem Abdulrasool [mailto:<a href="mailto:abdulras@fb.com" target="_blank">abdulras@fb.com</a>]<br>
> Sent: Friday, May 16, 2014 11:23 PM<br>
> To: Rajat Mahajan<br>
> Cc: <a href="mailto:llvmdev@cs.uiuc.edu" target="_blank">llvmdev@cs.uiuc.edu</a><br>
> Subject: Re: [LLVMdev] Code generation support in llvm for windows phone<br>
><br>
><br>
> On May 16, 2014, at 6:53 AM, Rajat Mahajan <<a href="mailto:rmahajan@adobe.com" target="_blank">rmahajan@adobe.com</a>> wrote:<br>
><br>
>> Hi,<br>
>><br>
>> Is there support available in llc to convert llvm bytecode to Windows Mobile binary?<br>
>> I have tried triples like arm-pc-win32 , thumbv7-window ... but the object file generated is not getting linked to the windows native project.<br>
>> Any pointers will be greatly appreciated?<br>
><br>
> As Reid mentioned, I have been working on this recently. Â Just to make sure that we are talking about the same environment, I assume that you are talking about Windows 8 (ARM NT) rather than the Windows CE based environment.<br>
><br>
> Can you please explain what exactly you mean by "the object file generated is not getting linked to the windows native project". Â The object file that we generate should be pretty compatible with MSVC. Â If you have specific cases where we are generating something that is incompatible, I would be quite interested in hearing about that.<br>
><br>
>> Thanks,<br>
>> ~rajat<br>
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> --<br>
> Saleem Abdulrasool<br>
> abdulras (at) fb (dot) com<br>
><br>
><br>
><br>
><br>
><br>
<br>
--<br>
Saleem Abdulrasool<br>
abdulras (at) fb (dot) com<br>
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<br></blockquote></div></div></div><span><font color="#888888"><br><br clear="all"><div><br></div>-- <br>Saleem Abdulrasool<br>compnerd (at) compnerd (dot) org
</font></span></div></div>
</blockquote></div><br></div>
</div></div></blockquote></div></div></div><div><div class="h5"><br><br clear="all"><div><br></div>-- <br>Saleem Abdulrasool<br>compnerd (at) compnerd (dot) org
</div></div></div></div>
</blockquote></div><br></div>