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Fix segfault in AArch64 backend with -g and -mbig-endian

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Fix a null pointer dereference when trying to swap the endianness of
fixups in the .eh_frame section in the AArch64 backend.

llvm-svn: 218311
This commit is contained in:
Oliver Stannard 2014-09-23 15:38:11 +00:00
parent 4e5a1bf8fe
commit d5ddd9f5ee
2 changed files with 24 additions and 2 deletions
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4
lib/Target/AArch64/MCTargetDesc/AArch64AsmBackend.cpp
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@ -535,8 +535,8 @@ void ELFAArch64AsmBackend::applyFixup(const MCFixup &Fixup, char *Data,
// store fixups in .eh_frame section in big endian order // store fixups in .eh_frame section in big endian order
if (!IsLittleEndian && Fixup.getKind() == FK_Data_4) { if (!IsLittleEndian && Fixup.getKind() == FK_Data_4) {
const MCSection *Sec = Fixup.getValue()->FindAssociatedSection(); const MCSection *Sec = Fixup.getValue()->FindAssociatedSection();
const MCSectionELF *SecELF = static_cast<const MCSectionELF *>(Sec); const MCSectionELF *SecELF = dyn_cast_or_null<const MCSectionELF>(Sec);
if (SecELF->getSectionName() == ".eh_frame") if (SecELF && SecELF->getSectionName() == ".eh_frame")
Value = ByteSwap_32(unsigned(Value)); Value = ByteSwap_32(unsigned(Value));
} }
AArch64AsmBackend::applyFixup (Fixup, Data, DataSize, Value, IsPCRel); AArch64AsmBackend::applyFixup (Fixup, Data, DataSize, Value, IsPCRel);

22
test/DebugInfo/AArch64/big-endian.ll Normal file
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@ -0,0 +1,22 @@
; RUN: llc %s -filetype=asm -o -
target datalayout = "E-m:e-i64:64-i128:128-n32:64-S128"
target triple = "aarch64_be--none-eabi"
@a = common global i32 0, align 4
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!8, !9}
!llvm.ident = !{!10}
!0 = metadata !{i32 786449, metadata !1, i32 12, metadata !"clang version 3.6.0 ", i1 true, metadata !"", i32 0, metadata !2, metadata !2, metadata !2, metadata !3, metadata !2, metadata !"", i32 1} ; [ DW_TAG_compile_unit ] [/work/validation/-] [DW_LANG_C99]
!1 = metadata !{metadata !"-", metadata !"/work/validation"}
!2 = metadata !{}
!3 = metadata !{metadata !4}
!4 = metadata !{i32 786484, i32 0, null, metadata !"a", metadata !"a", metadata !"", metadata !5, i32 1, metadata !7, i32 0, i32 1, i32* @a, null} ; [ DW_TAG_variable ] [a] [line 1] [def]
!5 = metadata !{i32 786473, metadata !6} ; [ DW_TAG_file_type ] [/work/validation/<stdin>]
!6 = metadata !{metadata !"<stdin>", metadata !"/work/validation"}
!7 = metadata !{i32 786468, null, null, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
!8 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
!9 = metadata !{i32 2, metadata !"Debug Info Version", i32 1}
!10 = metadata !{metadata !"clang version 3.6.0 "}