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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I would think that the R_X86_64_PC32 relocation type should never be generated with large code model since large code model, by definition, makes no assumptions
about the size or address of sections. The use of win32-elf might throw a wrinkle into this, since that is a code path that probably isn’t exercised much outside of MCJIT use.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">That said, when this assertion fails it is usually because of an implementation problem such as Philip describes.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">In theory, when the memory manager allocates memory the address of any two blocks allocated can come back with arbitrarily distant addresses. The only way
to guarantee that the address of two sections will never be more than 2 GB apart is to allocate a single block to hold the memory for both sections. Some changes were proposed recently to allow this with custom memory managers, but I don’t know if the changes
have been committed.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">In practice, unless some kind of address randomization tool is being used the default memory manager will allocate all blocks within close proximity to one
another very nearly all the time, particularly on x86-based Linux systems. As such, if you are seeing this kind of failure consistently it probably does mean that the sections in question got their addresses in different ways.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Can you reproduce the problem using lli or llvm-rtdyld?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">-Andy<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> llvmdev-bounces@cs.uiuc.edu [mailto:llvmdev-bounces@cs.uiuc.edu]
<b>On Behalf Of </b>Philip Reames<br>
<b>Sent:</b> Monday, May 26, 2014 11:33 AM<br>
<b>To:</b> Aliaksei Zasenka; LLVMdev@cs.uiuc.edu<br>
<b>Subject:</b> Re: [LLVMdev] Assertion fails resolving R_X86_64_PC32 relocation<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I ran into a similar error a while back and it turned out to be user error on my part. I had relocated some of the sections in the object file, but not others. As a result, I'd ended up with one (unrelocated) section with a reference
to another (relocated) section which was more than 32 bits away. You may want to double check your memory layout. What caught my eye about your question was that ".eh_frame" was one of the sections in question for me too.
<br>
<br>
Philip<br>
<br>
On 05/26/2014 08:51 AM, Aliaksei Zasenka wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Hi llvm-community,<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">I use llc (3.4-final) to generate object file:<br>
<br>
<i>llc code.bc -mtriple=x86_64-pc-win32-elf -mcpu=x86-64 -filetype=obj -code-model=large -o=code.o</i><o:p></o:p></p>
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<p class="MsoNormal">then I load it with <i>RuntimeDyld + SectionMemoryManager</i> in my app.<br>
<br>
I faced the problem described in <a href="http://llvm.org/bugs/show_bug.cgi?id=15356">
15356 </a>bug. Debug assertion fails at /lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.cpp:273.<br>
I noticed that R_X86_64_PC32 relocations are used only within .eh_frame section. Why aren't R_X86_64_64 relocations used in that case?
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Is there any working solution of this problem?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thank you in advance.<br>
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<span style="font-size:9.0pt;font-family:"Tahoma","sans-serif";color:#6B6B6B">Best regards,</span><o:p></o:p></p>
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<p class="MsoNormal">Alexey Zasenko<o:p></o:p></p>
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<p class="MsoNormal"><br>
<br>
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<o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>LLVM Developers mailing list<o:p></o:p></pre>
<pre><a href="mailto:LLVMdev@cs.uiuc.edu">LLVMdev@cs.uiuc.edu</a> <a href="http://llvm.cs.uiuc.edu">http://llvm.cs.uiuc.edu</a><o:p></o:p></pre>
<pre><a href="http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev">http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev</a><o:p></o:p></pre>
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<p class="MsoNormal"><o:p> </o:p></p>
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