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Produce a undefined reference to _GLOBAL_OFFSET_TABLE_ when needed.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115623 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2010-10-05 15:48:37 +00:00
parent 266a69f375
commit 5c77c16f31
2 changed files with 30 additions and 2 deletions
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26
lib/MC/ELFObjectWriter.cpp
View File

@ -70,6 +70,17 @@ static bool isFixupKindX86PCRel(unsigned Kind) {
}
}
static bool RelocNeedsGOT(unsigned Type) {
switch (Type) {
default:
return false;
case ELF::R_X86_64_GOT32:
case ELF::R_X86_64_PLT32:
case ELF::R_X86_64_GOTPCREL:
return true;
}
}
namespace {
class ELFObjectWriterImpl {
@ -133,6 +144,8 @@ namespace {
int NumRegularSections;
bool NeedsGOT;
ELFObjectWriter *Writer;
raw_ostream &OS;
@ -153,7 +166,7 @@ namespace {
public:
ELFObjectWriterImpl(ELFObjectWriter *_Writer, bool _Is64Bit,
bool _HasRelAddend, Triple::OSType _OSType)
: Writer(_Writer), OS(Writer->getStream()),
: NeedsGOT(false), Writer(_Writer), OS(Writer->getStream()),
Is64Bit(_Is64Bit), HasRelocationAddend(_HasRelAddend),
OSType(_OSType) {
}
@ -647,6 +660,9 @@ void ELFObjectWriterImpl::RecordRelocation(const MCAssembler &Asm,
}
}
if (RelocNeedsGOT(Type))
NeedsGOT = true;
ELFRelocationEntry ERE;
ERE.Index = Index;
@ -677,6 +693,14 @@ ELFObjectWriterImpl::getSymbolIndexInSymbolTable(const MCAssembler &Asm,
}
void ELFObjectWriterImpl::ComputeSymbolTable(MCAssembler &Asm) {
// FIXME: Is this the correct place to do this?
if (NeedsGOT) {
llvm::StringRef Name = "_GLOBAL_OFFSET_TABLE_";
MCSymbol *Sym = Asm.getContext().GetOrCreateSymbol(Name);
MCSymbolData &Data = Asm.getOrCreateSymbolData(*Sym);
Data.setExternal(true);
}
// Build section lookup table.
NumRegularSections = Asm.size();
DenseMap<const MCSection*, uint8_t> SectionIndexMap;

6
test/MC/ELF/got.s
View File

@ -1,10 +1,14 @@
// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s -o - | elf-dump | FileCheck %s
// Test that this produces a R_X86_64_GOT32.
// Test that this produces a R_X86_64_GOT32 and that we have an undefined
// reference to _GLOBAL_OFFSET_TABLE_.
movl foo@GOT, %eax
movl foo@GOTPCREL(%rip), %eax
// CHECK: (('st_name', 5) # '_GLOBAL_OFFSET_TABLE_'
// CHECK-NEXT: ('st_bind', 1)
// CHECK: ('_relocations', [
// CHECK-NEXT: # Relocation 0
// CHECK-NEXT: (('r_offset',