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Produce a undefined reference to _GLOBAL_OFFSET_TABLE_ when needed.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115623 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -70,6 +70,17 @@ static bool isFixupKindX86PCRel(unsigned Kind) {
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}
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}
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static bool RelocNeedsGOT(unsigned Type) {
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switch (Type) {
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default:
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return false;
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case ELF::R_X86_64_GOT32:
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case ELF::R_X86_64_PLT32:
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case ELF::R_X86_64_GOTPCREL:
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return true;
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}
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}
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namespace {
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class ELFObjectWriterImpl {
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@ -133,6 +144,8 @@ namespace {
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int NumRegularSections;
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bool NeedsGOT;
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ELFObjectWriter *Writer;
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raw_ostream &OS;
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@ -153,7 +166,7 @@ namespace {
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public:
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ELFObjectWriterImpl(ELFObjectWriter *_Writer, bool _Is64Bit,
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bool _HasRelAddend, Triple::OSType _OSType)
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: Writer(_Writer), OS(Writer->getStream()),
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: NeedsGOT(false), Writer(_Writer), OS(Writer->getStream()),
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Is64Bit(_Is64Bit), HasRelocationAddend(_HasRelAddend),
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OSType(_OSType) {
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}
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@ -647,6 +660,9 @@ void ELFObjectWriterImpl::RecordRelocation(const MCAssembler &Asm,
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}
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}
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if (RelocNeedsGOT(Type))
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NeedsGOT = true;
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ELFRelocationEntry ERE;
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ERE.Index = Index;
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@ -677,6 +693,14 @@ ELFObjectWriterImpl::getSymbolIndexInSymbolTable(const MCAssembler &Asm,
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}
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void ELFObjectWriterImpl::ComputeSymbolTable(MCAssembler &Asm) {
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// FIXME: Is this the correct place to do this?
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if (NeedsGOT) {
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llvm::StringRef Name = "_GLOBAL_OFFSET_TABLE_";
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MCSymbol *Sym = Asm.getContext().GetOrCreateSymbol(Name);
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MCSymbolData &Data = Asm.getOrCreateSymbolData(*Sym);
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Data.setExternal(true);
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}
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// Build section lookup table.
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NumRegularSections = Asm.size();
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DenseMap<const MCSection*, uint8_t> SectionIndexMap;
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@ -1,10 +1,14 @@
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// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s -o - | elf-dump | FileCheck %s
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// Test that this produces a R_X86_64_GOT32.
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// Test that this produces a R_X86_64_GOT32 and that we have an undefined
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// reference to _GLOBAL_OFFSET_TABLE_.
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movl foo@GOT, %eax
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movl foo@GOTPCREL(%rip), %eax
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// CHECK: (('st_name', 5) # '_GLOBAL_OFFSET_TABLE_'
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// CHECK-NEXT: ('st_bind', 1)
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// CHECK: ('_relocations', [
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// CHECK-NEXT: # Relocation 0
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// CHECK-NEXT: (('r_offset',
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