[LLVMbugs] [Bug 18693] New: Misaligned memory access in RuntimeDyldELF

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18693

            Bug ID: 18693
           Summary: Misaligned memory access in RuntimeDyldELF
           Product: libraries
           Version: trunk
          Hardware: Sun
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Generic Execution Engine Support
          Assignee: unassignedbugs at nondot.org
          Reporter: venkatra at cs.wisc.edu
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

The function RuntimeDyldELF::resolveX86_64Relocation() contains code similar to
the following code pattern

    uint64_t *Target = reinterpret_cast<uint64_t*>(Section.Address + Offset);
    *Target = Value + Addend;

  Since the pointer "Target" is not guaranteed to be 64 bit aligned, it causes
bus error in Sparc.

  This causes the following unit cases to fail in SPARC.
    LLVM :: DebugInfo/debuglineinfo.test
    LLVM :: MC/COFF/seh-align2.s
    LLVM :: MC/COFF/seh-align3.s

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