search for: getmaxstubsize

...chafmeister; Kaylor, Andrew; iain at codesourcery.com > Cc: <llvmdev at cs.uiuc.edu> > Subject: Re: [LLVMdev] A weird, reproducable problem with MCJIT > >   > > Correct or no I don't know, but this change will affect all x86-64 > targets including Linux and Windows as getMaxStubSize() is called from > the ELF linker as well as the Mach-O linker. > >   > >   > > 2013/10/15 Christian Schafmeister <chris.schaf at verizon.net> > > > With the help of iain at codesourcery.com and andrew.kaylor at intel.com > we > tracked the...

Correct or no I don't know, but this change will affect all x86-64 targets including Linux and Windows as getMaxStubSize() is called from the ELF linker as well as the Mach-O linker. 2013/10/15 Christian Schafmeister <chris.schaf at verizon.net> > > With the help of iain at codesourcery.com and andrew.kaylor at intel.com we > tracked the problem down to a bad relocation that was clobbering the >...

...ber 14, 2013 9:09 PM To: Christian Schafmeister; Kaylor, Andrew; iain at codesourcery.com Cc: <llvmdev at cs.uiuc.edu> Subject: Re: [LLVMdev] A weird, reproducable problem with MCJIT Correct or no I don't know, but this change will affect all x86-64 targets including Linux and Windows as getMaxStubSize() is called from the ELF linker as well as the Mach-O linker. 2013/10/15 Christian Schafmeister <chris.schaf at verizon.net<mailto:chris.schaf at verizon.net>> With the help of iain at codesourcery.com<mailto:iain at codesourcery.com> and andrew.kaylor at intel.com<mailto:an...

With the help of iain at codesourcery.com and andrew.kaylor at intel.com we tracked the problem down to a bad relocation that was clobbering the first bytes of the eh_frame. I think this problem/solution may be OS X specific. On akaylor's suggestion I made the change below and my reproducable test case now compiles fine with MCJIT. As well, my Common Lisp code base now compiles using MCJIT

Hi, There may be two problems with __register_frame usage. However based on http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-April/061768.html I think the existing code is correct for OS-X but likely buggy for Linux and Windows systems. Your crash is on OS-X, right? Anyhow, the first problem is very easy to fix. On Linux and Windows (at least) __register_frame should be called once and not

...tub function a relative call to the GOT entry. + RelocationEntry RE(SectionID, StubOffset + 2, + ELF::R_X86_64_GOTPCREL, -4); + addRelocationForSymbol(RE, Value.SymbolName); + + // Bump our stub offset counter + Section.StubOffset = StubOffset + getMaxStubSize(); + } + + // Make the target call a call into the stub table. + resolveRelocation(Section, Offset, StubAddress, + ELF::R_X86_64_PC32, Addend); + } else { + RelocationEntry RE(SectionID, Offset, ELF::R_X86_64_PC32, Value.Addend, +...