[LLVMbugs] [Bug 19470] New: Cannot form relocation for reference to GOT in 64-bit X86

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19470

            Bug ID: 19470
           Summary: Cannot form relocation for reference to GOT in 64-bit
                    X86
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: david.majnemer at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

consider:
        .text
        .file   "/var/tmp/t.ll"
        .globl  fun
        .align  16, 0x90
        .type   fun, at function
fun:                                    # @fun
        .cfi_startproc
# BB#0:
        movl    $_GLOBAL_OFFSET_TABLE_, %eax
        retq
.Ltmp0:
        .size   fun, .Ltmp0-fun
        .cfi_endproc


        .section        ".note.GNU-stack","", at progbits

go with:
~/llvm/build/bin/llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu t.s -o -

#0  0x00007ffff681b425 in __GI_raise (sig=<optimized out>) at
../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1  0x00007ffff681eb8b in __GI_abort () at abort.c:91
#2  0x00000000006ce406 in llvm::llvm_unreachable_internal (msg=0xe04448
"invalid fixup kind!", file=0xee8505
"~/llvm/src/lib/Target/X86/MCTargetDesc/X86ELFObjectWriter.cpp", line=0x64) at
~/llvm/src/lib/Support/ErrorHandling.cpp:99
#3  0x00000000008477c9 in (anonymous
namespace)::X86ELFObjectWriter::GetRelocType (this=0x1431bf0, Target=...,
Fixup=..., IsPCRel=0x0) at
~/llvm/src/lib/Target/X86/MCTargetDesc/X86ELFObjectWriter.cpp:100
#4  0x0000000000862944 in (anonymous namespace)::ELFObjectWriter::GetRelocType
(this=0x1435f40, Target=..., Fixup=..., IsPCRel=0x0) at
~/llvm/src/lib/MC/ELFObjectWriter.cpp:186
#5  0x0000000000857e4d in (anonymous
namespace)::ELFObjectWriter::RecordRelocation (this=0x1435f40, Asm=...,
Layout=..., Fragment=0x1439a10, Fixup=..., Target=..., IsPCRel=@0x7fffffffb8e7:
0x0, FixedValue=@0x7fffffffb8e8: 0x1) at
~/llvm/src/lib/MC/ELFObjectWriter.cpp:881
#6  0x00000000005ebd4d in llvm::MCAssembler::handleFixup (this=0x1435510,
Layout=..., F=..., Fixup=...) at ~/llvm/src/lib/MC/MCAssembler.cpp:751
#7  0x00000000005ec449 in llvm::MCAssembler::Finish (this=0x1435510) at
~/llvm/src/lib/MC/MCAssembler.cpp:820
#8  0x000000000087cabd in llvm::MCObjectStreamer::FinishImpl (this=0x1435320)
at ~/llvm/src/lib/MC/MCObjectStreamer.cpp:388
#9  0x0000000000871aba in llvm::MCELFStreamer::FinishImpl (this=0x1435320) at
~/llvm/src/lib/MC/MCELFStreamer.cpp:544
#10 0x00000000006360af in llvm::MCStreamer::Finish (this=0x1435320) at
~/llvm/src/lib/MC/MCStreamer.cpp:639
#11 0x0000000000648c70 in (anonymous namespace)::AsmParser::Run
(this=0x1436280, NoInitialTextSection=0x0, NoFinalize=0x0) at
~/llvm/src/lib/MC/MCParser/AsmParser.cpp:701
#12 0x000000000041e22c in AssembleInput (ProgName=0x7fffffffe062
"~/llvm/build/bin/llvm-mc", TheTarget=0x142d2f8 <llvm::TheX86_64Target>,
SrcMgr=..., Ctx=..., Str=..., MAI=..., STI=..., MCII=...) at
~/llvm/src/tools/llvm-mc/llvm-mc.cpp:335
#13 0x000000000041c171 in main (argc=0x7, argv=0x7fffffffdcc8) at
~/llvm/src/tools/llvm-mc/llvm-mc.cpp:468

It seems that we fail to do anything with X86::reloc_global_offset_table in
64-bit mode.

Note that we cannot perform the simple mapping that we have in 32-bit mode
because we need to take code-model into account.

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