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-rw-r--r--lib/MC/ELFObjectWriter.cpp81
1 files changed, 52 insertions, 29 deletions
diff --git a/lib/MC/ELFObjectWriter.cpp b/lib/MC/ELFObjectWriter.cpp
index eda0623..3d99548 100644
--- a/lib/MC/ELFObjectWriter.cpp
+++ b/lib/MC/ELFObjectWriter.cpp
@@ -1,4 +1,4 @@
-//===- lib/MC/ELFObjectWriter.cpp - ELF File Writer -------------------===//
+//===- lib/MC/ELFObjectWriter.cpp - ELF File Writer -----------------------===//
//
// The LLVM Compiler Infrastructure
//
@@ -11,17 +11,17 @@
//
//===----------------------------------------------------------------------===//
-#include "MCELF.h"
+#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/ADT/OwningPtr.h"
+#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallString.h"
-#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAsmLayout.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCContext.h"
-#include "llvm/MC/MCELFObjectWriter.h"
+#include "llvm/MC/MCELF.h"
#include "llvm/MC/MCELFSymbolFlags.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCFixupKindInfo.h"
@@ -29,9 +29,8 @@
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/Debug.h"
-#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/ELF.h"
-
+#include "llvm/Support/ErrorHandling.h"
#include <vector>
using namespace llvm;
@@ -136,16 +135,14 @@ class ELFObjectWriter : public MCObjectWriter {
const MCSymbol *undefinedExplicitRelSym(const MCValue &Target,
const MCFixup &Fixup,
bool IsPCRel) const {
- return TargetObjectWriter->undefinedExplicitRelSym(Target, Fixup, IsPCRel);
+ return TargetObjectWriter->undefinedExplicitRelSym(Target, Fixup,
+ IsPCRel);
}
bool is64Bit() const { return TargetObjectWriter->is64Bit(); }
bool hasRelocationAddend() const {
return TargetObjectWriter->hasRelocationAddend();
}
- unsigned getEFlags() const {
- return TargetObjectWriter->getEFlags();
- }
unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
bool IsPCRel, bool IsRelocWithSymbol,
int64_t Addend) const {
@@ -153,13 +150,12 @@ class ELFObjectWriter : public MCObjectWriter {
IsRelocWithSymbol, Addend);
}
-
public:
ELFObjectWriter(MCELFObjectTargetWriter *MOTW,
raw_ostream &_OS, bool IsLittleEndian)
: MCObjectWriter(_OS, IsLittleEndian),
TargetObjectWriter(MOTW),
- NeedsGOT(false), NeedsSymtabShndx(false){
+ NeedsGOT(false), NeedsSymtabShndx(false) {
}
virtual ~ELFObjectWriter();
@@ -204,7 +200,7 @@ class ELFObjectWriter : public MCObjectWriter {
void String8(MCDataFragment &F, uint8_t Value) {
char buf[1];
buf[0] = Value;
- F.getContents() += StringRef(buf, 1);
+ F.getContents().append(&buf[0], &buf[1]);
}
void String16(MCDataFragment &F, uint16_t Value) {
@@ -213,7 +209,7 @@ class ELFObjectWriter : public MCObjectWriter {
StringLE16(buf, Value);
else
StringBE16(buf, Value);
- F.getContents() += StringRef(buf, 2);
+ F.getContents().append(&buf[0], &buf[2]);
}
void String32(MCDataFragment &F, uint32_t Value) {
@@ -222,7 +218,7 @@ class ELFObjectWriter : public MCObjectWriter {
StringLE32(buf, Value);
else
StringBE32(buf, Value);
- F.getContents() += StringRef(buf, 4);
+ F.getContents().append(&buf[0], &buf[4]);
}
void String64(MCDataFragment &F, uint64_t Value) {
@@ -231,10 +227,11 @@ class ELFObjectWriter : public MCObjectWriter {
StringLE64(buf, Value);
else
StringBE64(buf, Value);
- F.getContents() += StringRef(buf, 8);
+ F.getContents().append(&buf[0], &buf[8]);
}
- void WriteHeader(uint64_t SectionDataSize,
+ void WriteHeader(const MCAssembler &Asm,
+ uint64_t SectionDataSize,
unsigned NumberOfSections);
void WriteSymbolEntry(MCDataFragment *SymtabF,
@@ -374,7 +371,8 @@ ELFObjectWriter::~ELFObjectWriter()
{}
// Emit the ELF header.
-void ELFObjectWriter::WriteHeader(uint64_t SectionDataSize,
+void ELFObjectWriter::WriteHeader(const MCAssembler &Asm,
+ uint64_t SectionDataSize,
unsigned NumberOfSections) {
// ELF Header
// ----------
@@ -412,7 +410,7 @@ void ELFObjectWriter::WriteHeader(uint64_t SectionDataSize,
sizeof(ELF::Elf32_Ehdr))); // e_shoff = sec hdr table off in bytes
// e_flags = whatever the target wants
- Write32(getEFlags());
+ Write32(Asm.getELFHeaderEFlags());
// e_ehsize = ELF header size
Write16(is64Bit() ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr));
@@ -548,12 +546,17 @@ void ELFObjectWriter::WriteSymbol(MCDataFragment *SymtabF,
bool IsReserved = Data.isCommon() || Data.getSymbol().isAbsolute() ||
Data.getSymbol().isVariable();
+ // Binding and Type share the same byte as upper and lower nibbles
uint8_t Binding = MCELF::GetBinding(OrigData);
- uint8_t Visibility = MCELF::GetVisibility(OrigData);
uint8_t Type = MCELF::GetType(Data);
-
uint8_t Info = (Binding << ELF_STB_Shift) | (Type << ELF_STT_Shift);
- uint8_t Other = Visibility;
+
+ // Other and Visibility share the same byte with Visability using the lower
+ // 2 bits
+ uint8_t Visibility = MCELF::GetVisibility(OrigData);
+ uint8_t Other = MCELF::getOther(OrigData) <<
+ (ELF_Other_Shift - ELF_STV_Shift);
+ Other |= Visibility;
uint64_t Value = SymbolValue(Data, Layout);
uint64_t Size = 0;
@@ -866,7 +869,7 @@ void ELFObjectWriter::ComputeSymbolTable(MCAssembler &Asm,
// FIXME: Is this the correct place to do this?
// FIXME: Why is an undefined reference to _GLOBAL_OFFSET_TABLE_ needed?
if (NeedsGOT) {
- llvm::StringRef Name = "_GLOBAL_OFFSET_TABLE_";
+ StringRef Name = "_GLOBAL_OFFSET_TABLE_";
MCSymbol *Sym = Asm.getContext().GetOrCreateSymbol(Name);
MCSymbolData &Data = Asm.getOrCreateSymbolData(*Sym);
Data.setExternal(true);
@@ -975,7 +978,7 @@ void ELFObjectWriter::ComputeSymbolTable(MCAssembler &Asm,
for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i)
UndefinedSymbolData[i].SymbolData->setIndex(Index++);
- if (NumRegularSections > ELF::SHN_LORESERVE)
+ if (Index >= ELF::SHN_LORESERVE)
NeedsSymtabShndx = true;
}
@@ -1187,7 +1190,7 @@ void ELFObjectWriter::CreateMetadataSections(MCAssembler &Asm,
// The first entry of a string table holds a null character so skip
// section 0.
uint64_t Index = 1;
- F->getContents() += '\x00';
+ F->getContents().push_back('\x00');
for (unsigned int I = 0, E = Sections.size(); I != E; ++I) {
const MCSectionELF &Section = *Sections[I];
@@ -1205,8 +1208,8 @@ void ELFObjectWriter::CreateMetadataSections(MCAssembler &Asm,
SectionStringTableIndex[&Section] = Index;
Index += Name.size() + 1;
- F->getContents() += Name;
- F->getContents() += '\x00';
+ F->getContents().append(Name.begin(), Name.end());
+ F->getContents().push_back('\x00');
}
}
@@ -1320,6 +1323,8 @@ void ELFObjectWriter::WriteSection(MCAssembler &Asm,
case ELF::SHT_FINI_ARRAY:
case ELF::SHT_PREINIT_ARRAY:
case ELF::SHT_X86_64_UNWIND:
+ case ELF::SHT_MIPS_REGINFO:
+ case ELF::SHT_MIPS_OPTIONS:
// Nothing to do.
break;
@@ -1333,6 +1338,24 @@ void ELFObjectWriter::WriteSection(MCAssembler &Asm,
break;
}
+ if (TargetObjectWriter->getEMachine() == ELF::EM_ARM &&
+ Section.getType() == ELF::SHT_ARM_EXIDX) {
+ StringRef SecName(Section.getSectionName());
+ if (SecName == ".ARM.exidx") {
+ sh_link = SectionIndexMap.lookup(
+ Asm.getContext().getELFSection(".text",
+ ELF::SHT_PROGBITS,
+ ELF::SHF_EXECINSTR | ELF::SHF_ALLOC,
+ SectionKind::getText()));
+ } else if (SecName.startswith(".ARM.exidx")) {
+ sh_link = SectionIndexMap.lookup(
+ Asm.getContext().getELFSection(SecName.substr(sizeof(".ARM.exidx") - 1),
+ ELF::SHT_PROGBITS,
+ ELF::SHF_EXECINSTR | ELF::SHF_ALLOC,
+ SectionKind::getText()));
+ }
+ }
+
WriteSecHdrEntry(SectionStringTableIndex[&Section], Section.getType(),
Section.getFlags(), 0, Offset, Size, sh_link, sh_info,
Alignment, Section.getEntrySize());
@@ -1381,7 +1404,7 @@ void ELFObjectWriter::WriteDataSectionData(MCAssembler &Asm,
++i) {
const MCFragment &F = *i;
assert(F.getKind() == MCFragment::FT_Data);
- WriteBytes(cast<MCDataFragment>(F).getContents().str());
+ WriteBytes(cast<MCDataFragment>(F).getContents());
}
} else {
Asm.writeSectionData(&SD, Layout);
@@ -1533,7 +1556,7 @@ void ELFObjectWriter::WriteObject(MCAssembler &Asm,
}
// Write out the ELF header ...
- WriteHeader(SectionHeaderOffset, NumSections + 1);
+ WriteHeader(Asm, SectionHeaderOffset, NumSections + 1);
// ... then the regular sections ...
// + because of .shstrtab
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