ELFObjectWriter.cpp revision af3d38f70ebba9fec0048c2540dbdf0168d280d2
13565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming//===- lib/MC/ELFObjectWriter.cpp - ELF File Writer -------------------===// 23565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// 33565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// The LLVM Compiler Infrastructure 43565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// 53565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// This file is distributed under the University of Illinois Open Source 63565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// License. See LICENSE.TXT for details. 73565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// 83565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming//===----------------------------------------------------------------------===// 93565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// 103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// This file implements ELF object file writer information. 113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// 123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming//===----------------------------------------------------------------------===// 133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/ELFObjectWriter.h" 158f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola#include "llvm/ADT/SmallPtrSet.h" 163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/ADT/STLExtras.h" 173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/ADT/StringMap.h" 183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/ADT/Twine.h" 193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCAssembler.h" 203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCAsmLayout.h" 213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCContext.h" 223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCELFSymbolFlags.h" 233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCExpr.h" 243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCObjectWriter.h" 253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCSectionELF.h" 263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCSymbol.h" 273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCValue.h" 283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/Support/Debug.h" 293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/Support/ErrorHandling.h" 303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/Support/ELF.h" 313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/Target/TargetAsmBackend.h" 323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "../Target/X86/X86FixupKinds.h" 343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include <vector> 363565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingusing namespace llvm; 373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 38ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindolastatic unsigned GetType(const MCSymbolData &SD) { 39ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola uint32_t Type = (SD.getFlags() & (0xf << ELF_STT_Shift)) >> ELF_STT_Shift; 40ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola assert(Type == ELF::STT_NOTYPE || Type == ELF::STT_OBJECT || 41ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola Type == ELF::STT_FUNC || Type == ELF::STT_SECTION || 42ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola Type == ELF::STT_FILE || Type == ELF::STT_COMMON || 43ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola Type == ELF::STT_TLS); 44ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola return Type; 45ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola} 46ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola 47e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindolastatic unsigned GetBinding(const MCSymbolData &SD) { 48e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola uint32_t Binding = (SD.getFlags() & (0xf << ELF_STB_Shift)) >> ELF_STB_Shift; 49e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola assert(Binding == ELF::STB_LOCAL || Binding == ELF::STB_GLOBAL || 50e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola Binding == ELF::STB_WEAK); 51e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola return Binding; 52e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola} 53e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola 54e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindolastatic void SetBinding(MCSymbolData &SD, unsigned Binding) { 55e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola assert(Binding == ELF::STB_LOCAL || Binding == ELF::STB_GLOBAL || 56e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola Binding == ELF::STB_WEAK); 57e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola uint32_t OtherFlags = SD.getFlags() & ~(0xf << ELF_STB_Shift); 58e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola SD.setFlags(OtherFlags | (Binding << ELF_STB_Shift)); 59e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola} 60e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola 61152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindolastatic unsigned GetVisibility(MCSymbolData &SD) { 62152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola unsigned Visibility = 63152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola (SD.getFlags() & (0xf << ELF_STV_Shift)) >> ELF_STV_Shift; 64152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola assert(Visibility == ELF::STV_DEFAULT || Visibility == ELF::STV_INTERNAL || 65152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola Visibility == ELF::STV_HIDDEN || Visibility == ELF::STV_PROTECTED); 66152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola return Visibility; 67152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola} 68152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola 69cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindolastatic bool isFixupKindX86PCRel(unsigned Kind) { 70cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola switch (Kind) { 71cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola default: 72cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola return false; 73cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola case X86::reloc_pcrel_1byte: 74cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola case X86::reloc_pcrel_4byte: 75cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola case X86::reloc_riprel_4byte: 76cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola case X86::reloc_riprel_4byte_movq_load: 77cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola return true; 78cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola } 79cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola} 80cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola 81a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindolastatic bool RelocNeedsGOT(MCSymbolRefExpr::VariantKind Variant) { 82a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola switch (Variant) { 835c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola default: 845c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola return false; 85a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_GOT: 86a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_PLT: 87a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_GOTPCREL: 88a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_TPOFF: 89a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_TLSGD: 90a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_GOTTPOFF: 91a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_INDNTPOFF: 92a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_NTPOFF: 93a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_GOTNTPOFF: 94a264f72d3fb9dec1427480fcf17ef3c746ea723aRafael Espindola case MCSymbolRefExpr::VK_TLSLDM: 950cf15d61b7e3bf53f5a99f58ada37b93bc039559Rafael Espindola case MCSymbolRefExpr::VK_DTPOFF: 96b4d1721eff7b43577e5f2e53f885973fb6c43683Rafael Espindola case MCSymbolRefExpr::VK_TLSLD: 975c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola return true; 985c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola } 995c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola} 1005c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola 1013565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingnamespace { 1023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming class ELFObjectWriterImpl { 104b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner /*static bool isFixupKindX86RIPRel(unsigned Kind) { 1053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming return Kind == X86::reloc_riprel_4byte || 1063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Kind == X86::reloc_riprel_4byte_movq_load; 107b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner }*/ 1083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// ELFSymbolData - Helper struct for containing some precomputed information 1113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// on symbols. 1123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming struct ELFSymbolData { 1133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData *SymbolData; 1143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t StringIndex; 1153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint32_t SectionIndex; 1163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Support lexicographic sorting. 1183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool operator<(const ELFSymbolData &RHS) const { 119ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola if (GetType(*SymbolData) == ELF::STT_FILE) 120ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola return true; 121ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola if (GetType(*RHS.SymbolData) == ELF::STT_FILE) 122ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola return false; 12336c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer return SymbolData->getSymbol().getName() < 12436c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer RHS.SymbolData->getSymbol().getName(); 1253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming }; 1273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @name Relocation Data 1293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @{ 1303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming struct ELFRelocationEntry { 1323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Make these big enough for both 32-bit and 64-bit 1333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t r_offset; 1348f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola int Index; 1358f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola unsigned Type; 1368f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola const MCSymbol *Symbol; 1373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t r_addend; 1383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Support lexicographic sorting. 1403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool operator<(const ELFRelocationEntry &RE) const { 1413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming return RE.r_offset < r_offset; 1423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming }; 1443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1458f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola SmallPtrSet<const MCSymbol *, 16> UsedInReloc; 146484291c27319668ad99cb87def000254357736fbRafael Espindola SmallPtrSet<const MCSymbol *, 16> WeakrefUsedInReloc; 14788182132470527e27231f09b25a885893e528c66Rafael Espindola DenseMap<const MCSymbol *, const MCSymbol *> Renames; 1488f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola 1493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming llvm::DenseMap<const MCSectionData*, 1503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFRelocationEntry> > Relocations; 1513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming DenseMap<const MCSection*, uint64_t> SectionStringTableIndex; 1523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @} 1543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @name Symbol Table Data 1553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @{ 1563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SmallString<256> StringTable; 1583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFSymbolData> LocalSymbolData; 1593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFSymbolData> ExternalSymbolData; 1603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFSymbolData> UndefinedSymbolData; 1613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @} 1633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1648f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola int NumRegularSections; 1658f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola 1665c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola bool NeedsGOT; 1675c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola 1687be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola bool NeedsSymtabShndx; 1697be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola 1703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFObjectWriter *Writer; 1713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming raw_ostream &OS; 1733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned Is64Bit : 1; 1753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool HasRelocationAddend; 1773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1785baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky Triple::OSType OSType; 1795baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky 180eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck uint16_t EMachine; 181eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck 1823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // This holds the symbol table index of the last local symbol. 1833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned LastLocalSymbolIndex; 1843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // This holds the .strtab section index. 1853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned StringTableIndex; 1867be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola // This holds the .symtab section index. 1877be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola unsigned SymbolTableIndex; 1883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned ShstrtabIndex; 1903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming public: 1923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFObjectWriterImpl(ELFObjectWriter *_Writer, bool _Is64Bit, 193eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck uint16_t _EMachine, bool _HasRelAddend, 194eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck Triple::OSType _OSType) 1957be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola : NeedsGOT(false), NeedsSymtabShndx(false), Writer(_Writer), 1967be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola OS(Writer->getStream()), 1975baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky Is64Bit(_Is64Bit), HasRelocationAddend(_HasRelAddend), 198eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck OSType(_OSType), EMachine(_EMachine) { 1993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void Write8(uint8_t Value) { Writer->Write8(Value); } 2023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void Write16(uint16_t Value) { Writer->Write16(Value); } 2033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void Write32(uint32_t Value) { Writer->Write32(Value); } 204b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner //void Write64(uint64_t Value) { Writer->Write64(Value); } 2053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteZeros(unsigned N) { Writer->WriteZeros(N); } 206b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner //void WriteBytes(StringRef Str, unsigned ZeroFillSize = 0) { 207b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner // Writer->WriteBytes(Str, ZeroFillSize); 208b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner //} 2093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteWord(uint64_t W) { 211b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner if (Is64Bit) 2123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Writer->Write64(W); 213b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner else 2143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Writer->Write32(W); 2153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringLE16(char *buf, uint16_t Value) { 2183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[0] = char(Value >> 0); 2193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[1] = char(Value >> 8); 2203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringLE32(char *buf, uint32_t Value) { 22336c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer StringLE16(buf, uint16_t(Value >> 0)); 224c522f6e70b02d161e4bf37023edb20643ee34acfBenjamin Kramer StringLE16(buf + 2, uint16_t(Value >> 16)); 2253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringLE64(char *buf, uint64_t Value) { 22836c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer StringLE32(buf, uint32_t(Value >> 0)); 229c522f6e70b02d161e4bf37023edb20643ee34acfBenjamin Kramer StringLE32(buf + 4, uint32_t(Value >> 32)); 2303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringBE16(char *buf ,uint16_t Value) { 2333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[0] = char(Value >> 8); 2343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[1] = char(Value >> 0); 2353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringBE32(char *buf, uint32_t Value) { 23836c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer StringBE16(buf, uint16_t(Value >> 16)); 239c522f6e70b02d161e4bf37023edb20643ee34acfBenjamin Kramer StringBE16(buf + 2, uint16_t(Value >> 0)); 2403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringBE64(char *buf, uint64_t Value) { 24336c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer StringBE32(buf, uint32_t(Value >> 32)); 244c522f6e70b02d161e4bf37023edb20643ee34acfBenjamin Kramer StringBE32(buf + 4, uint32_t(Value >> 0)); 2453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 247af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola void String8(MCDataFragment &F, uint8_t Value) { 248af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola char buf[1]; 249af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola buf[0] = Value; 250af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola F.getContents() += StringRef(buf, 1); 251af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola } 252af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola 253af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola void String16(MCDataFragment &F, uint16_t Value) { 254af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola char buf[2]; 2553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Writer->isLittleEndian()) 256f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringLE16(buf, Value); 2573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming else 258f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringBE16(buf, Value); 259af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola F.getContents() += StringRef(buf, 2); 2603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 262af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola void String32(MCDataFragment &F, uint32_t Value) { 263af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola char buf[4]; 2643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Writer->isLittleEndian()) 265f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringLE32(buf, Value); 2663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming else 267f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringBE32(buf, Value); 268af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola F.getContents() += StringRef(buf, 4); 2693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 271af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola void String64(MCDataFragment &F, uint64_t Value) { 272af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola char buf[8]; 2733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Writer->isLittleEndian()) 274f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringLE64(buf, Value); 2753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming else 276f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringBE64(buf, Value); 277af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola F.getContents() += StringRef(buf, 8); 2783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteHeader(uint64_t SectionDataSize, unsigned NumberOfSections); 2813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2827be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola void WriteSymbolEntry(MCDataFragment *SymtabF, MCDataFragment *ShndxF, 2837be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola uint64_t name, uint8_t info, 2843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t value, uint64_t size, 2857be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola uint8_t other, uint32_t shndx, 2867be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola bool Reserved); 2873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2887be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola void WriteSymbol(MCDataFragment *SymtabF, MCDataFragment *ShndxF, 2897be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola ELFSymbolData &MSD, 2903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout); 2913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2927be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola void WriteSymbolTable(MCDataFragment *SymtabF, MCDataFragment *ShndxF, 2937be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola const MCAssembler &Asm, 29471859c640f6a36251aca223fd503c58dc314e296Rafael Espindola const MCAsmLayout &Layout, 29571859c640f6a36251aca223fd503c58dc314e296Rafael Espindola unsigned NumRegularSections); 2963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void RecordRelocation(const MCAssembler &Asm, const MCAsmLayout &Layout, 2983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFragment *Fragment, const MCFixup &Fixup, 2993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCValue Target, uint64_t &FixedValue); 3003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3010b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin Kramer uint64_t getSymbolIndexInSymbolTable(const MCAssembler &Asm, 3020b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin Kramer const MCSymbol *S); 3033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// ComputeSymbolTable - Compute the symbol table data 3053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// 3063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// \param StringTable [out] - The string table data. 3073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// \param StringIndexMap [out] - Map from symbol names to offsets in the 3083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// string table. 3093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void ComputeSymbolTable(MCAssembler &Asm); 3103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout, 3123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData &SD); 3133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteRelocations(MCAssembler &Asm, MCAsmLayout &Layout) { 3153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 3163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 3173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteRelocation(Asm, Layout, *it); 3183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 3193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 3203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void CreateMetadataSections(MCAssembler &Asm, MCAsmLayout &Layout); 3223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 32388182132470527e27231f09b25a885893e528c66Rafael Espindola void ExecutePostLayoutBinding(MCAssembler &Asm); 3243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteSecHdrEntry(uint32_t Name, uint32_t Type, uint64_t Flags, 3263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Address, uint64_t Offset, 3273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Size, uint32_t Link, uint32_t Info, 3283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Alignment, uint64_t EntrySize); 3293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteRelocationsFragment(const MCAssembler &Asm, MCDataFragment *F, 3313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData *SD); 3323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3337070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola bool IsFixupFullyResolved(const MCAssembler &Asm, 3347070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCValue Target, 3357070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola bool IsPCRel, 3367070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCFragment *DF) const; 3377070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 3388f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola void WriteObject(MCAssembler &Asm, const MCAsmLayout &Layout); 3393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming }; 3403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 3423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// Emit the ELF header. 3443565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteHeader(uint64_t SectionDataSize, 3453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned NumberOfSections) { 3463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ELF Header 3473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ---------- 3483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 3493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Note 3503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ---- 3513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // emitWord method behaves differently for ELF32 and ELF64, writing 3523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 4 bytes in the former and 8 in the latter. 3533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(0x7f); // e_ident[EI_MAG0] 3553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8('E'); // e_ident[EI_MAG1] 3563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8('L'); // e_ident[EI_MAG2] 3573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8('F'); // e_ident[EI_MAG3] 3583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(Is64Bit ? ELF::ELFCLASS64 : ELF::ELFCLASS32); // e_ident[EI_CLASS] 3603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_ident[EI_DATA] 3623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(Writer->isLittleEndian() ? ELF::ELFDATA2LSB : ELF::ELFDATA2MSB); 3633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(ELF::EV_CURRENT); // e_ident[EI_VERSION] 3655baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky // e_ident[EI_OSABI] 3665baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky switch (OSType) { 3675baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky case Triple::FreeBSD: Write8(ELF::ELFOSABI_FREEBSD); break; 3685baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky case Triple::Linux: Write8(ELF::ELFOSABI_LINUX); break; 3695baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky default: Write8(ELF::ELFOSABI_NONE); break; 3705baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky } 3713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(0); // e_ident[EI_ABIVERSION] 3723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteZeros(ELF::EI_NIDENT - ELF::EI_PAD); 3743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(ELF::ET_REL); // e_type 3763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 377eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck Write16(EMachine); // e_machine = target 3783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(ELF::EV_CURRENT); // e_version 3803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(0); // e_entry, no entry point in .o file 3813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(0); // e_phoff, no program header for .o 382eb97677764beb115c658ac559d3649c6c4068eb9Benjamin Kramer WriteWord(SectionDataSize + (Is64Bit ? sizeof(ELF::Elf64_Ehdr) : 383eb97677764beb115c658ac559d3649c6c4068eb9Benjamin Kramer sizeof(ELF::Elf32_Ehdr))); // e_shoff = sec hdr table off in bytes 3843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // FIXME: Make this configurable. 3863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(0); // e_flags = whatever the target wants 3873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_ehsize = ELF header size 3893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(Is64Bit ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr)); 3903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(0); // e_phentsize = prog header entry size 3923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(0); // e_phnum = # prog header entries = 0 3933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_shentsize = Section header entry size 3953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(Is64Bit ? sizeof(ELF::Elf64_Shdr) : sizeof(ELF::Elf32_Shdr)); 3963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_shnum = # of section header ents 3987be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola if (NumberOfSections >= ELF::SHN_LORESERVE) 3997be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Write16(0); 4007be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola else 4017be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Write16(NumberOfSections); 4023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_shstrndx = Section # of '.shstrtab' 4047be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola if (NumberOfSections >= ELF::SHN_LORESERVE) 4057be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Write16(ELF::SHN_XINDEX); 4067be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola else 4077be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Write16(ShstrtabIndex); 4083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 4093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4107be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindolavoid ELFObjectWriterImpl::WriteSymbolEntry(MCDataFragment *SymtabF, 4117be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola MCDataFragment *ShndxF, 4127be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola uint64_t name, 4133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint8_t info, uint64_t value, 4143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t size, uint8_t other, 4157be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola uint32_t shndx, 4167be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola bool Reserved) { 4177be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola if (ShndxF) { 4187be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola if (shndx >= ELF::SHN_LORESERVE && !Reserved) 419af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String32(*ShndxF, shndx); 4207be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola else 421af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String32(*ShndxF, 0); 4227be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola } 4237be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola 424af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola uint16_t Index = (shndx >= ELF::SHN_LORESERVE && !Reserved) ? 425af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola uint16_t(ELF::SHN_XINDEX) : shndx; 4263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 427af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola if (Is64Bit) { 428af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String32(*SymtabF, name); // st_name 429af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String8(*SymtabF, info); // st_info 430af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String8(*SymtabF, other); // st_other 431af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String16(*SymtabF, Index); // st_shndx 432af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String64(*SymtabF, value); // st_value 433af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String64(*SymtabF, size); // st_size 4343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 435af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String32(*SymtabF, name); // st_name 436af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String32(*SymtabF, value); // st_value 437af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String32(*SymtabF, size); // st_size 438af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String8(*SymtabF, info); // st_info 439af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String8(*SymtabF, other); // st_other 440af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String16(*SymtabF, Index); // st_shndx 4413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 4423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 4433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4442c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindolastatic uint64_t SymbolValue(MCSymbolData &Data, const MCAsmLayout &Layout) { 4452c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola if (Data.isCommon() && Data.isExternal()) 4462c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola return Data.getCommonAlignment(); 4472c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola 4482c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola const MCSymbol &Symbol = Data.getSymbol(); 4492c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola if (!Symbol.isInSection()) 4502c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola return 0; 4512c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola 4521973d4379250a88938a9358c12d96e96bdc8dedeRafael Espindola if (MCFragment *FF = Data.getFragment()) 4531973d4379250a88938a9358c12d96e96bdc8dedeRafael Espindola return Layout.getSymbolAddress(&Data) - 4541973d4379250a88938a9358c12d96e96bdc8dedeRafael Espindola Layout.getSectionAddress(FF->getParent()); 4552c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola 4562c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola return 0; 4572c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola} 4582c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola 459de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindolastatic const MCSymbol &AliasedSymbol(const MCSymbol &Symbol) { 460de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola const MCSymbol *S = &Symbol; 461de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola while (S->isVariable()) { 462de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola const MCExpr *Value = S->getVariableValue(); 463a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola if (Value->getKind() != MCExpr::SymbolRef) 464a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola return *S; 465152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola const MCSymbolRefExpr *Ref = static_cast<const MCSymbolRefExpr*>(Value); 466de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola S = &Ref->getSymbol(); 467152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola } 468de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola return *S; 469de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola} 470de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola 47188182132470527e27231f09b25a885893e528c66Rafael Espindolavoid ELFObjectWriterImpl::ExecutePostLayoutBinding(MCAssembler &Asm) { 47288182132470527e27231f09b25a885893e528c66Rafael Espindola // The presence of symbol versions causes undefined symbols and 47388182132470527e27231f09b25a885893e528c66Rafael Espindola // versions declared with @@@ to be renamed. 47488182132470527e27231f09b25a885893e528c66Rafael Espindola 47588182132470527e27231f09b25a885893e528c66Rafael Espindola for (MCAssembler::symbol_iterator it = Asm.symbol_begin(), 47688182132470527e27231f09b25a885893e528c66Rafael Espindola ie = Asm.symbol_end(); it != ie; ++it) { 47788182132470527e27231f09b25a885893e528c66Rafael Espindola const MCSymbol &Alias = it->getSymbol(); 47888182132470527e27231f09b25a885893e528c66Rafael Espindola const MCSymbol &Symbol = AliasedSymbol(Alias); 479f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola MCSymbolData &SD = Asm.getSymbolData(Symbol); 480f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola 481f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola // Undefined symbols are global, but this is the first place we 482f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola // are able to set it. 483f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola if (Symbol.isUndefined() && !Symbol.isVariable()) { 484f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola if (GetBinding(SD) == ELF::STB_LOCAL) { 485f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola SetBinding(SD, ELF::STB_GLOBAL); 486f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola SetBinding(*it, ELF::STB_GLOBAL); 487f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola } 488f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola } 489f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola 490f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola // Not an alias. 491f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola if (&Symbol == &Alias) 492f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola continue; 493f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola 49407ee63283cc2b9a4d6c98ecd30d1b721fe3cb29aBenjamin Kramer StringRef AliasName = Alias.getName(); 49588182132470527e27231f09b25a885893e528c66Rafael Espindola size_t Pos = AliasName.find('@'); 49688182132470527e27231f09b25a885893e528c66Rafael Espindola if (Pos == StringRef::npos) 49788182132470527e27231f09b25a885893e528c66Rafael Espindola continue; 49888182132470527e27231f09b25a885893e528c66Rafael Espindola 499f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola // Aliases defined with .symvar copy the binding from the symbol they alias. 500f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola // This is the first place we are able to copy this information. 501f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola it->setExternal(SD.isExternal()); 502f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola SetBinding(*it, GetBinding(SD)); 503f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola 50407ee63283cc2b9a4d6c98ecd30d1b721fe3cb29aBenjamin Kramer StringRef Rest = AliasName.substr(Pos); 50588182132470527e27231f09b25a885893e528c66Rafael Espindola if (!Symbol.isUndefined() && !Rest.startswith("@@@")) 50688182132470527e27231f09b25a885893e528c66Rafael Espindola continue; 50788182132470527e27231f09b25a885893e528c66Rafael Espindola 50883ff4d2b0d6133d48055a27fe25c5d241bca7e9bRafael Espindola // FIXME: produce a better error message. 50983ff4d2b0d6133d48055a27fe25c5d241bca7e9bRafael Espindola if (Symbol.isUndefined() && Rest.startswith("@@") && 51083ff4d2b0d6133d48055a27fe25c5d241bca7e9bRafael Espindola !Rest.startswith("@@@")) 51183ff4d2b0d6133d48055a27fe25c5d241bca7e9bRafael Espindola report_fatal_error("A @@ version cannot be undefined"); 51283ff4d2b0d6133d48055a27fe25c5d241bca7e9bRafael Espindola 51307ee63283cc2b9a4d6c98ecd30d1b721fe3cb29aBenjamin Kramer Renames.insert(std::make_pair(&Symbol, &Alias)); 51488182132470527e27231f09b25a885893e528c66Rafael Espindola } 51588182132470527e27231f09b25a885893e528c66Rafael Espindola} 51688182132470527e27231f09b25a885893e528c66Rafael Espindola 5177be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindolavoid ELFObjectWriterImpl::WriteSymbol(MCDataFragment *SymtabF, 5187be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola MCDataFragment *ShndxF, 5197be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola ELFSymbolData &MSD, 520de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola const MCAsmLayout &Layout) { 521de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola MCSymbolData &OrigData = *MSD.SymbolData; 522de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola MCSymbolData &Data = 523de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola Layout.getAssembler().getSymbolData(AliasedSymbol(OrigData.getSymbol())); 524152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola 5257be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola bool IsReserved = Data.isCommon() || Data.getSymbol().isAbsolute() || 5267be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Data.getSymbol().isVariable(); 5277be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola 528152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Binding = GetBinding(OrigData); 529152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Visibility = GetVisibility(OrigData); 530152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Type = GetType(Data); 531152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola 532152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Info = (Binding << ELF_STB_Shift) | (Type << ELF_STT_Shift); 533152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Other = Visibility; 534152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola 5352c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola uint64_t Value = SymbolValue(Data, Layout); 5363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Size = 0; 5373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCExpr *ESize; 5383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 539f7c10a3cff61c70efe8e405d9bdc5386e8e3fc0aRafael Espindola assert(!(Data.isCommon() && !Data.isExternal())); 540f7c10a3cff61c70efe8e405d9bdc5386e8e3fc0aRafael Espindola 5413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ESize = Data.getSize(); 5423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Data.getSize()) { 5433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCValue Res; 5443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (ESize->getKind() == MCExpr::Binary) { 5453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(ESize); 5463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (BE->EvaluateAsRelocatable(Res, &Layout)) { 54824f1206c7de0f21d309d27737071ad742d5ddf27Benjamin Kramer assert(!Res.getSymA() || !Res.getSymA()->getSymbol().isDefined()); 54924f1206c7de0f21d309d27737071ad742d5ddf27Benjamin Kramer assert(!Res.getSymB() || !Res.getSymB()->getSymbol().isDefined()); 550f230df9af4012f9510de664b6d62b128e26a5861Rafael Espindola Size = Res.getConstant(); 5513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else if (ESize->getKind() == MCExpr::Constant) { 553368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer Size = static_cast<const MCConstantExpr *>(ESize)->getValue(); 5543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 5553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(0 && "Unsupported size expression"); 5563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Write out the symbol table entry 5607be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola WriteSymbolEntry(SymtabF, ShndxF, MSD.StringIndex, Info, Value, 5617be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Size, Other, MSD.SectionIndex, IsReserved); 5623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 5633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5647be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindolavoid ELFObjectWriterImpl::WriteSymbolTable(MCDataFragment *SymtabF, 5657be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola MCDataFragment *ShndxF, 5663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAssembler &Asm, 56771859c640f6a36251aca223fd503c58dc314e296Rafael Espindola const MCAsmLayout &Layout, 56871859c640f6a36251aca223fd503c58dc314e296Rafael Espindola unsigned NumRegularSections) { 5693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // The string table must be emitted first because we need the index 5703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // into the string table for all the symbol names. 5713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(StringTable.size() && "Missing string table"); 5723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // FIXME: Make sure the start of the symbol table is aligned. 5743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // The first entry is the undefined symbol entry. 5767be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola WriteSymbolEntry(SymtabF, ShndxF, 0, 0, 0, 0, 0, 0, false); 5773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Write the symbol table entries. 5793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LastLocalSymbolIndex = LocalSymbolData.size() + 1; 5803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = LocalSymbolData.size(); i != e; ++i) { 5813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData &MSD = LocalSymbolData[i]; 5827be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola WriteSymbol(SymtabF, ShndxF, MSD, Layout); 5833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 58571859c640f6a36251aca223fd503c58dc314e296Rafael Espindola // Write out a symbol table entry for each regular section. 586a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman unsigned Index = 1; 58771859c640f6a36251aca223fd503c58dc314e296Rafael Espindola for (MCAssembler::const_iterator it = Asm.begin(); 58871859c640f6a36251aca223fd503c58dc314e296Rafael Espindola Index <= NumRegularSections; ++it, ++Index) { 589a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman const MCSectionELF &Section = 590368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer static_cast<const MCSectionELF&>(it->getSection()); 591a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman // Leave out relocations so we don't have indexes within 592a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman // the relocations messed up 593377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer if (Section.getType() == ELF::SHT_RELA || Section.getType() == ELF::SHT_REL) 594a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman continue; 5957be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola WriteSymbolEntry(SymtabF, ShndxF, 0, ELF::STT_SECTION, 0, 0, 5967be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola ELF::STV_DEFAULT, Index, false); 597a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman LastLocalSymbolIndex++; 598a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman } 5993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = ExternalSymbolData.size(); i != e; ++i) { 6013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData &MSD = ExternalSymbolData[i]; 6023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData &Data = *MSD.SymbolData; 6033223f19ff0920ffee686faba3bf74babf580e8a5Rafael Espindola assert(((Data.getFlags() & ELF_STB_Global) || 6043223f19ff0920ffee686faba3bf74babf580e8a5Rafael Espindola (Data.getFlags() & ELF_STB_Weak)) && 6053223f19ff0920ffee686faba3bf74babf580e8a5Rafael Espindola "External symbol requires STB_GLOBAL or STB_WEAK flag"); 6067be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola WriteSymbol(SymtabF, ShndxF, MSD, Layout); 607e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola if (GetBinding(Data) == ELF::STB_LOCAL) 6083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LastLocalSymbolIndex++; 6093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 6103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i) { 6123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData &MSD = UndefinedSymbolData[i]; 6133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData &Data = *MSD.SymbolData; 6147be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola WriteSymbol(SymtabF, ShndxF, MSD, Layout); 615e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola if (GetBinding(Data) == ELF::STB_LOCAL) 6163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LastLocalSymbolIndex++; 6173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 6183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 6193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6207eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindolastatic bool ShouldRelocOnSymbol(const MCSymbolData &SD, 6213729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola const MCValue &Target, 6223729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola const MCFragment &F) { 6237eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola const MCSymbol &Symbol = SD.getSymbol(); 6247eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola if (Symbol.isUndefined()) 6257eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola return true; 6267eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola 6277eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola const MCSectionELF &Section = 6287eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola static_cast<const MCSectionELF&>(Symbol.getSection()); 6297eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola 6307eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola if (SD.isExternal()) 6317eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola return true; 6327eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola 6338cecf253e45f144b9a7fd0ace85eeeeb0bebfc83Rafael Espindola MCSymbolRefExpr::VariantKind Kind = Target.getSymA()->getKind(); 6343729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola const MCSectionELF &Sec2 = 6353729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola static_cast<const MCSectionELF&>(F.getParent()->getSection()); 6363729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola 637ce2d3c57758619e99a99104e1168a9558658fab0Rafael Espindola if (Section.getKind().isBSS()) 638ce2d3c57758619e99a99104e1168a9558658fab0Rafael Espindola return false; 639ce2d3c57758619e99a99104e1168a9558658fab0Rafael Espindola 6408cecf253e45f144b9a7fd0ace85eeeeb0bebfc83Rafael Espindola if (&Sec2 != &Section && 641c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola (Kind == MCSymbolRefExpr::VK_PLT || 642c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola Kind == MCSymbolRefExpr::VK_GOTPCREL || 643c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola Kind == MCSymbolRefExpr::VK_GOTOFF)) 6443729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola return true; 6453729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola 646c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola if (Section.getFlags() & MCSectionELF::SHF_MERGE) 647c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola return Target.getConstant() != 0; 648c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola 6497eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola return false; 65073ffea47d20bc9f559b4ce0c60166ee504073832Rafael Espindola} 65173ffea47d20bc9f559b4ce0c60166ee504073832Rafael Espindola 652e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer// FIXME: this is currently X86/X86_64 only 6533565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::RecordRelocation(const MCAssembler &Asm, 6543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout, 6553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFragment *Fragment, 6563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFixup &Fixup, 6573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCValue Target, 6583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t &FixedValue) { 6593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming int64_t Addend = 0; 6608f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola int Index = 0; 66195c602ade3aa30de17abd53b85968a3feb8fdfbcBenjamin Kramer int64_t Value = Target.getConstant(); 6628f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola const MCSymbol *Symbol = 0; 66329129728f1d4febe44792d1481077cc47fe83a08Rafael Espindola const MCSymbol *Renamed = 0; 6643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6650007489312ecb1b51ae275f1e452786480151a4cRafael Espindola bool IsPCRel = isFixupKindX86PCRel(Fixup.getKind()); 66681cfb8529b7fd1e98fefb79fb46b10301b93ab75Benjamin Kramer if (!Target.isAbsolute()) { 667de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola Symbol = &AliasedSymbol(Target.getSymA()->getSymbol()); 66829129728f1d4febe44792d1481077cc47fe83a08Rafael Espindola Renamed = Renames.lookup(Symbol); 66929129728f1d4febe44792d1481077cc47fe83a08Rafael Espindola if (!Renamed) 670484291c27319668ad99cb87def000254357736fbRafael Espindola Renamed = &Target.getSymA()->getSymbol(); 6713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData &SD = Asm.getSymbolData(*Symbol); 67263d37b932278724d51e7f8bd1f2574c7b45f85f0Benjamin Kramer MCFragment *F = SD.getFragment(); 6733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6749d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola if (const MCSymbolRefExpr *RefB = Target.getSymB()) { 6759d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola const MCSymbol &SymbolB = RefB->getSymbol(); 6769d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola MCSymbolData &SDB = Asm.getSymbolData(SymbolB); 6779d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola IsPCRel = true; 67855fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola MCSectionData *Sec = Fragment->getParent(); 67955fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola 68055fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola // Offset of the symbol in the section 68155fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola int64_t a = Layout.getSymbolAddress(&SDB) - Layout.getSectionAddress(Sec); 68255fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola 68355fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola // Ofeset of the relocation in the section 68455fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola int64_t b = Layout.getFragmentOffset(Fragment) + Fixup.getOffset(); 68555fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola Value += b - a; 6869d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola } 6879d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola 6887eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola // Check that this case has already been fully resolved before we get 6897eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola // here. 6900007489312ecb1b51ae275f1e452786480151a4cRafael Espindola if (Symbol->isDefined() && !SD.isExternal() && 6910007489312ecb1b51ae275f1e452786480151a4cRafael Espindola IsPCRel && 6920007489312ecb1b51ae275f1e452786480151a4cRafael Espindola &Fragment->getParent()->getSection() == &Symbol->getSection()) { 6937eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola llvm_unreachable("We don't need a relocation in this case."); 6940007489312ecb1b51ae275f1e452786480151a4cRafael Espindola return; 6950007489312ecb1b51ae275f1e452786480151a4cRafael Espindola } 6960007489312ecb1b51ae275f1e452786480151a4cRafael Espindola 6973729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola bool RelocOnSymbol = ShouldRelocOnSymbol(SD, Target, *Fragment); 6987eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola if (!RelocOnSymbol) { 6998f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola Index = F->getParent()->getOrdinal(); 7007eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola 7017eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola MCSectionData *FSD = F->getParent(); 7027eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola // Offset of the symbol in the section 7037eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola Value += Layout.getSymbolAddress(&SD) - Layout.getSectionAddress(FSD); 7048f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola } else { 70529129728f1d4febe44792d1481077cc47fe83a08Rafael Espindola UsedInReloc.insert(Renamed); 706484291c27319668ad99cb87def000254357736fbRafael Espindola MCSymbolData &RenamedSD = Asm.getSymbolData(*Renamed); 707484291c27319668ad99cb87def000254357736fbRafael Espindola if (RenamedSD.getFlags() & ELF_Other_Weakref) { 708484291c27319668ad99cb87def000254357736fbRafael Espindola WeakrefUsedInReloc.insert(Symbol); 709484291c27319668ad99cb87def000254357736fbRafael Espindola } 7108f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola Index = -1; 7118f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola } 7127eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola Addend = Value; 7137eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola // Compensate for the addend on i386. 7147eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola if (Is64Bit) 7157eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola Value = 0; 7163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 7173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 71895c602ade3aa30de17abd53b85968a3feb8fdfbcBenjamin Kramer FixedValue = Value; 71995c602ade3aa30de17abd53b85968a3feb8fdfbcBenjamin Kramer 7203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // determine the type of the relocation 72128f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola 72228f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola MCSymbolRefExpr::VariantKind Modifier = Target.getSymA()->getKind(); 72363d37b932278724d51e7f8bd1f2574c7b45f85f0Benjamin Kramer unsigned Type; 724e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer if (Is64Bit) { 725e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer if (IsPCRel) { 72692bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola switch (Modifier) { 7279edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola default: 7289edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola llvm_unreachable("Unimplemented"); 72992bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola case MCSymbolRefExpr::VK_None: 73092bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola Type = ELF::R_X86_64_PC32; 73192bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola break; 73292bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola case MCSymbolRefExpr::VK_PLT: 73392bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola Type = ELF::R_X86_64_PLT32; 73492bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola break; 735a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_GOTPCREL: 736607d1f6d3216b647c07965bafae8d1aba6312136Rafael Espindola Type = ELF::R_X86_64_GOTPCREL; 737607d1f6d3216b647c07965bafae8d1aba6312136Rafael Espindola break; 738bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola case MCSymbolRefExpr::VK_GOTTPOFF: 739bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola Type = ELF::R_X86_64_GOTTPOFF; 740bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola break; 741bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola case MCSymbolRefExpr::VK_TLSGD: 742bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola Type = ELF::R_X86_64_TLSGD; 743bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola break; 744b4d1721eff7b43577e5f2e53f885973fb6c43683Rafael Espindola case MCSymbolRefExpr::VK_TLSLD: 745b4d1721eff7b43577e5f2e53f885973fb6c43683Rafael Espindola Type = ELF::R_X86_64_TLSLD; 746b4d1721eff7b43577e5f2e53f885973fb6c43683Rafael Espindola break; 74792bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola } 748e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } else { 749e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer switch ((unsigned)Fixup.getKind()) { 750e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer default: llvm_unreachable("invalid fixup kind!"); 751e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_8: Type = ELF::R_X86_64_64; break; 752a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola case X86::reloc_signed_4byte: 753e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case X86::reloc_pcrel_4byte: 754a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola assert(isInt<32>(Target.getConstant())); 75528f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola switch (Modifier) { 7569edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola default: 7579edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola llvm_unreachable("Unimplemented"); 75828f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola case MCSymbolRefExpr::VK_None: 75928f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola Type = ELF::R_X86_64_32S; 76028f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola break; 76128f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola case MCSymbolRefExpr::VK_GOT: 76228f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola Type = ELF::R_X86_64_GOT32; 76328f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola break; 764c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola case MCSymbolRefExpr::VK_GOTPCREL: 7658cecf253e45f144b9a7fd0ace85eeeeb0bebfc83Rafael Espindola Type = ELF::R_X86_64_GOTPCREL; 7668cecf253e45f144b9a7fd0ace85eeeeb0bebfc83Rafael Espindola break; 767bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola case MCSymbolRefExpr::VK_TPOFF: 768bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola Type = ELF::R_X86_64_TPOFF32; 769bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola break; 770aa8f1f01352bdaaabf712369f8a8a615c776b508Rafael Espindola case MCSymbolRefExpr::VK_DTPOFF: 771aa8f1f01352bdaaabf712369f8a8a615c776b508Rafael Espindola Type = ELF::R_X86_64_DTPOFF32; 772aa8f1f01352bdaaabf712369f8a8a615c776b508Rafael Espindola break; 77328f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola } 774a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola break; 775e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_4: 776a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola Type = ELF::R_X86_64_32; 777e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer break; 778e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_2: Type = ELF::R_X86_64_16; break; 779e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case X86::reloc_pcrel_1byte: 780e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_1: Type = ELF::R_X86_64_8; break; 781e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } 782e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } 7833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 784e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer if (IsPCRel) { 7859edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola switch (Modifier) { 7869edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola default: 78724dc9ecdc55d732ac93fc782d6232413fe2c1160Rafael Espindola llvm_unreachable("Unimplemented"); 78824dc9ecdc55d732ac93fc782d6232413fe2c1160Rafael Espindola case MCSymbolRefExpr::VK_None: 7899baee3b3a3924bc45d007e54c71333739d135f8eRafael Espindola Type = ELF::R_386_PC32; 7909baee3b3a3924bc45d007e54c71333739d135f8eRafael Espindola break; 7919edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola case MCSymbolRefExpr::VK_PLT: 7929edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola Type = ELF::R_386_PLT32; 7939edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola break; 7949edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola } 795e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } else { 796e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer switch ((unsigned)Fixup.getKind()) { 797e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer default: llvm_unreachable("invalid fixup kind!"); 798a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola 79924ba4f7f5f27c8d64be7ad653863b33594e5f019Rafael Espindola case X86::reloc_global_offset_table: 80024ba4f7f5f27c8d64be7ad653863b33594e5f019Rafael Espindola Type = ELF::R_386_GOTPC; 80124ba4f7f5f27c8d64be7ad653863b33594e5f019Rafael Espindola break; 80224ba4f7f5f27c8d64be7ad653863b33594e5f019Rafael Espindola 803a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola // FIXME: Should we avoid selecting reloc_signed_4byte in 32 bit mode 804a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola // instead? 805a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola case X86::reloc_signed_4byte: 806e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case X86::reloc_pcrel_4byte: 807bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola case FK_Data_4: 808c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola switch (Modifier) { 8099edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola default: 8109edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola llvm_unreachable("Unimplemented"); 811bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola case MCSymbolRefExpr::VK_None: 81224ba4f7f5f27c8d64be7ad653863b33594e5f019Rafael Espindola Type = ELF::R_386_32; 813bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola break; 814eada30479399014c22c7b7edb008177c312eefeeRafael Espindola case MCSymbolRefExpr::VK_GOT: 815eada30479399014c22c7b7edb008177c312eefeeRafael Espindola Type = ELF::R_386_GOT32; 816eada30479399014c22c7b7edb008177c312eefeeRafael Espindola break; 817c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola case MCSymbolRefExpr::VK_GOTOFF: 818c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola Type = ELF::R_386_GOTOFF; 819c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola break; 8203cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola case MCSymbolRefExpr::VK_TLSGD: 8213cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola Type = ELF::R_386_TLS_GD; 8223cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola break; 8233cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola case MCSymbolRefExpr::VK_TPOFF: 8243cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola Type = ELF::R_386_TLS_LE_32; 8253cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola break; 8263cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola case MCSymbolRefExpr::VK_INDNTPOFF: 8273cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola Type = ELF::R_386_TLS_IE; 8283cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola break; 8293cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola case MCSymbolRefExpr::VK_NTPOFF: 8303cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola Type = ELF::R_386_TLS_LE; 8313cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola break; 832a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_GOTNTPOFF: 833a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola Type = ELF::R_386_TLS_GOTIE; 834a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola break; 835a264f72d3fb9dec1427480fcf17ef3c746ea723aRafael Espindola case MCSymbolRefExpr::VK_TLSLDM: 836a264f72d3fb9dec1427480fcf17ef3c746ea723aRafael Espindola Type = ELF::R_386_TLS_LDM; 837a264f72d3fb9dec1427480fcf17ef3c746ea723aRafael Espindola break; 8380cf15d61b7e3bf53f5a99f58ada37b93bc039559Rafael Espindola case MCSymbolRefExpr::VK_DTPOFF: 8390cf15d61b7e3bf53f5a99f58ada37b93bc039559Rafael Espindola Type = ELF::R_386_TLS_LDO_32; 8400cf15d61b7e3bf53f5a99f58ada37b93bc039559Rafael Espindola break; 841c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola } 842c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola break; 843e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_2: Type = ELF::R_386_16; break; 844e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case X86::reloc_pcrel_1byte: 845e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_1: Type = ELF::R_386_8; break; 846e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } 8473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 8483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 8493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 850a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola if (RelocNeedsGOT(Modifier)) 8515c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola NeedsGOT = true; 8525c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola 853e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer ELFRelocationEntry ERE; 854e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer 8558f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ERE.Index = Index; 8568f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ERE.Type = Type; 85729129728f1d4febe44792d1481077cc47fe83a08Rafael Espindola ERE.Symbol = Renamed; 8583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 85963d37b932278724d51e7f8bd1f2574c7b45f85f0Benjamin Kramer ERE.r_offset = Layout.getFragmentOffset(Fragment) + Fixup.getOffset(); 860e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer 8613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (HasRelocationAddend) 8623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ERE.r_addend = Addend; 863172d7d6a12b313dd5a8c1588b8f6bd49b1ce16b6Benjamin Kramer else 864172d7d6a12b313dd5a8c1588b8f6bd49b1ce16b6Benjamin Kramer ERE.r_addend = 0; // Silence compiler warning. 8653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Relocations[Fragment->getParent()].push_back(ERE); 8673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 8683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8690b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin Krameruint64_t 8700b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin KramerELFObjectWriterImpl::getSymbolIndexInSymbolTable(const MCAssembler &Asm, 8710b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin Kramer const MCSymbol *S) { 8727b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer MCSymbolData &SD = Asm.getSymbolData(*S); 8737b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer 8747b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer // Local symbol. 8757b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer if (!SD.isExternal() && !S->isUndefined()) 8767b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer return SD.getIndex() + /* empty symbol */ 1; 8777b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer 8787b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer // External or undefined symbol. 8798f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola return SD.getIndex() + NumRegularSections + /* empty symbol */ 1; 8803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 8813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 882737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindolastatic bool isInSymtab(const MCAssembler &Asm, const MCSymbolData &Data, 88388182132470527e27231f09b25a885893e528c66Rafael Espindola bool Used, bool Renamed) { 884484291c27319668ad99cb87def000254357736fbRafael Espindola if (Data.getFlags() & ELF_Other_Weakref) 885484291c27319668ad99cb87def000254357736fbRafael Espindola return false; 886484291c27319668ad99cb87def000254357736fbRafael Espindola 887bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola if (Used) 888bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola return true; 889bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola 89088182132470527e27231f09b25a885893e528c66Rafael Espindola if (Renamed) 89188182132470527e27231f09b25a885893e528c66Rafael Espindola return false; 89288182132470527e27231f09b25a885893e528c66Rafael Espindola 893737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola const MCSymbol &Symbol = Data.getSymbol(); 894a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola 895d179886f0595eb3564a9edfdfff79def130d89ccRafael Espindola if (Symbol.getName() == "_GLOBAL_OFFSET_TABLE_") 896d179886f0595eb3564a9edfdfff79def130d89ccRafael Espindola return true; 897d179886f0595eb3564a9edfdfff79def130d89ccRafael Espindola 898a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola const MCSymbol &A = AliasedSymbol(Symbol); 899d179886f0595eb3564a9edfdfff79def130d89ccRafael Espindola if (!A.isVariable() && A.isUndefined() && !Data.isCommon()) 900a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola return false; 901a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola 902737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola if (!Asm.isSymbolLinkerVisible(Symbol) && !Symbol.isUndefined()) 903737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return false; 904737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 905bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola if (Symbol.isTemporary()) 906737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return false; 907737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 908737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return true; 909737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola} 910737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 911737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindolastatic bool isLocal(const MCSymbolData &Data) { 912737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola if (Data.isExternal()) 913737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return false; 914737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 915737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola const MCSymbol &Symbol = Data.getSymbol(); 916737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola if (Symbol.isUndefined() && !Symbol.isVariable()) 917737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return false; 918737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 919737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return true; 920737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola} 921737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 9223565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::ComputeSymbolTable(MCAssembler &Asm) { 9235c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola // FIXME: Is this the correct place to do this? 9245c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola if (NeedsGOT) { 9255c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola llvm::StringRef Name = "_GLOBAL_OFFSET_TABLE_"; 9265c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola MCSymbol *Sym = Asm.getContext().GetOrCreateSymbol(Name); 9275c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola MCSymbolData &Data = Asm.getOrCreateSymbolData(*Sym); 9285c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola Data.setExternal(true); 929f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola SetBinding(Data, ELF::STB_GLOBAL); 9305c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola } 9315c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola 9323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Build section lookup table. 9338f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola NumRegularSections = Asm.size(); 934f5c347dfc25e133e357c7086ad1b24edad4d2bc8Rafael Espindola DenseMap<const MCSection*, uint32_t> SectionIndexMap; 9353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned Index = 1; 9363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::iterator it = Asm.begin(), 9373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it, ++Index) 9383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionIndexMap[&it->getSection()] = Index; 9393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Index 0 is always the empty string. 9413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StringMap<uint64_t> StringIndexMap; 9423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StringTable += '\x00'; 9433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 944a0949b50dcea35c08b50542091f97275f401529dRafael Espindola // Add the data for the symbols. 9453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::symbol_iterator it = Asm.symbol_begin(), 9463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.symbol_end(); it != ie; ++it) { 9473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSymbol &Symbol = it->getSymbol(); 9483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 949484291c27319668ad99cb87def000254357736fbRafael Espindola bool Used = UsedInReloc.count(&Symbol); 950484291c27319668ad99cb87def000254357736fbRafael Espindola bool WeakrefUsed = WeakrefUsedInReloc.count(&Symbol); 951484291c27319668ad99cb87def000254357736fbRafael Espindola if (!isInSymtab(Asm, *it, Used || WeakrefUsed, 95288182132470527e27231f09b25a885893e528c66Rafael Espindola Renames.count(&Symbol))) 9533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming continue; 9543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData MSD; 9563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MSD.SymbolData = it; 957a0949b50dcea35c08b50542091f97275f401529dRafael Espindola bool Local = isLocal(*it); 95888182132470527e27231f09b25a885893e528c66Rafael Espindola const MCSymbol &RefSymbol = AliasedSymbol(Symbol); 9593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 960484291c27319668ad99cb87def000254357736fbRafael Espindola if (RefSymbol.isUndefined() && !Used && WeakrefUsed) 961484291c27319668ad99cb87def000254357736fbRafael Espindola SetBinding(*it, ELF::STB_WEAK); 962484291c27319668ad99cb87def000254357736fbRafael Espindola 963f7c10a3cff61c70efe8e405d9bdc5386e8e3fc0aRafael Espindola if (it->isCommon()) { 964a0949b50dcea35c08b50542091f97275f401529dRafael Espindola assert(!Local); 965f7c10a3cff61c70efe8e405d9bdc5386e8e3fc0aRafael Espindola MSD.SectionIndex = ELF::SHN_COMMON; 966bf052ac5d1c8f21075bc675f629709c20791c5f7Rafael Espindola } else if (Symbol.isAbsolute() || RefSymbol.isVariable()) { 967a0949b50dcea35c08b50542091f97275f401529dRafael Espindola MSD.SectionIndex = ELF::SHN_ABS; 96888182132470527e27231f09b25a885893e528c66Rafael Espindola } else if (RefSymbol.isUndefined()) { 9693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MSD.SectionIndex = ELF::SHN_UNDEF; 9703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 971bf052ac5d1c8f21075bc675f629709c20791c5f7Rafael Espindola MSD.SectionIndex = SectionIndexMap.lookup(&RefSymbol.getSection()); 9727be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola if (MSD.SectionIndex >= ELF::SHN_LORESERVE) 9737be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola NeedsSymtabShndx = true; 9743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(MSD.SectionIndex && "Invalid section index!"); 9755df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola } 9765df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola 97788182132470527e27231f09b25a885893e528c66Rafael Espindola // The @@@ in symbol version is replaced with @ in undefined symbols and 97888182132470527e27231f09b25a885893e528c66Rafael Espindola // @@ in defined ones. 97988182132470527e27231f09b25a885893e528c66Rafael Espindola StringRef Name = Symbol.getName(); 98088182132470527e27231f09b25a885893e528c66Rafael Espindola size_t Pos = Name.find("@@@"); 98188182132470527e27231f09b25a885893e528c66Rafael Espindola std::string FinalName; 98288182132470527e27231f09b25a885893e528c66Rafael Espindola if (Pos != StringRef::npos) { 98307ee63283cc2b9a4d6c98ecd30d1b721fe3cb29aBenjamin Kramer StringRef Prefix = Name.substr(0, Pos); 98488182132470527e27231f09b25a885893e528c66Rafael Espindola unsigned n = MSD.SectionIndex == ELF::SHN_UNDEF ? 2 : 1; 98507ee63283cc2b9a4d6c98ecd30d1b721fe3cb29aBenjamin Kramer StringRef Suffix = Name.substr(Pos + n); 98688182132470527e27231f09b25a885893e528c66Rafael Espindola FinalName = Prefix.str() + Suffix.str(); 98788182132470527e27231f09b25a885893e528c66Rafael Espindola } else { 98888182132470527e27231f09b25a885893e528c66Rafael Espindola FinalName = Name.str(); 98988182132470527e27231f09b25a885893e528c66Rafael Espindola } 99088182132470527e27231f09b25a885893e528c66Rafael Espindola 99188182132470527e27231f09b25a885893e528c66Rafael Espindola uint64_t &Entry = StringIndexMap[FinalName]; 992a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola if (!Entry) { 993a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola Entry = StringTable.size(); 99488182132470527e27231f09b25a885893e528c66Rafael Espindola StringTable += FinalName; 995a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola StringTable += '\x00'; 9963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 997a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola MSD.StringIndex = Entry; 998a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola if (MSD.SectionIndex == ELF::SHN_UNDEF) 999a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola UndefinedSymbolData.push_back(MSD); 1000a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola else if (Local) 1001a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola LocalSymbolData.push_back(MSD); 1002a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola else 1003a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola ExternalSymbolData.push_back(MSD); 10043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 10053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Symbols are required to be in lexicographic order. 10073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(LocalSymbolData.begin(), LocalSymbolData.end()); 10083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(ExternalSymbolData.begin(), ExternalSymbolData.end()); 10093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(UndefinedSymbolData.begin(), UndefinedSymbolData.end()); 10103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Set the symbol indices. Local symbols must come before all other 10123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // symbols with non-local bindings. 10133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Index = 0; 10143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = LocalSymbolData.size(); i != e; ++i) 10153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LocalSymbolData[i].SymbolData->setIndex(Index++); 10163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = ExternalSymbolData.size(); i != e; ++i) 10173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ExternalSymbolData[i].SymbolData->setIndex(Index++); 10183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i) 10193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming UndefinedSymbolData[i].SymbolData->setIndex(Index++); 10203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 10213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10223565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout, 10233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData &SD) { 10243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (!Relocations[&SD].empty()) { 10253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCContext &Ctx = Asm.getContext(); 10264283f4b81e8c1cbf5c7a7b51e949e109ae25ff8cRafael Espindola const MCSectionELF *RelaSection; 10273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionELF &Section = 10283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming static_cast<const MCSectionELF&>(SD.getSection()); 10293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const StringRef SectionName = Section.getSectionName(); 1031377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer std::string RelaSectionName = HasRelocationAddend ? ".rela" : ".rel"; 10323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming RelaSectionName += SectionName; 1033299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer 1034299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer unsigned EntrySize; 1035299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer if (HasRelocationAddend) 1036299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer EntrySize = Is64Bit ? sizeof(ELF::Elf64_Rela) : sizeof(ELF::Elf32_Rela); 1037299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer else 1038299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer EntrySize = Is64Bit ? sizeof(ELF::Elf64_Rel) : sizeof(ELF::Elf32_Rel); 10393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1040377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer RelaSection = Ctx.getELFSection(RelaSectionName, HasRelocationAddend ? 1041377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer ELF::SHT_RELA : ELF::SHT_REL, 0, 10423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionKind::getReadOnly(), 104334be396a12b00a95a1353c356d64868798ea3098Rafael Espindola EntrySize); 10443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSectionData &RelaSD = Asm.getOrCreateSectionData(*RelaSection); 1046a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer RelaSD.setAlignment(Is64Bit ? 8 : 4); 10473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCDataFragment *F = new MCDataFragment(&RelaSD); 10493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteRelocationsFragment(Asm, F, &SD); 10513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10527070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola Asm.AddSectionToTheEnd(*Writer, RelaSD, Layout); 10533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 10543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 10553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10563565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteSecHdrEntry(uint32_t Name, uint32_t Type, 10573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Flags, uint64_t Address, 10583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Offset, uint64_t Size, 10593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint32_t Link, uint32_t Info, 10603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Alignment, 10613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t EntrySize) { 10623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Name); // sh_name: index into string table 10633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Type); // sh_type 10643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Flags); // sh_flags 10653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Address); // sh_addr 10663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Offset); // sh_offset 10673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Size); // sh_size 10683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Link); // sh_link 10693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Info); // sh_info 10703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Alignment); // sh_addralign 10713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(EntrySize); // sh_entsize 10723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 10733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10743565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteRelocationsFragment(const MCAssembler &Asm, 10753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCDataFragment *F, 10763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData *SD) { 10773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFRelocationEntry> &Relocs = Relocations[SD]; 10783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // sort by the r_offset just like gnu as does 10793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(Relocs.begin(), Relocs.end()); 10803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = Relocs.size(); i != e; ++i) { 10823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFRelocationEntry entry = Relocs[e - i - 1]; 10833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10848f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola if (entry.Index < 0) 10858f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola entry.Index = getSymbolIndexInSymbolTable(Asm, entry.Symbol); 10868f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola else 10878f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola entry.Index += LocalSymbolData.size() + 1; 10885e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer if (Is64Bit) { 1089af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String64(*F, entry.r_offset); 10905e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer 10918f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola struct ELF::Elf64_Rela ERE64; 10928f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ERE64.setSymbolAndType(entry.Index, entry.Type); 1093af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String64(*F, ERE64.r_info); 10945e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer 1095af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola if (HasRelocationAddend) 1096af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String64(*F, entry.r_addend); 10975e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer } else { 1098af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String32(*F, entry.r_offset); 10995e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer 11008f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola struct ELF::Elf32_Rela ERE32; 11018f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ERE32.setSymbolAndType(entry.Index, entry.Type); 1102af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String32(*F, ERE32.r_info); 11035e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer 1104af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola if (HasRelocationAddend) 1105af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String32(*F, entry.r_addend); 11065e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer } 11073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 11083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 11093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11103565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::CreateMetadataSections(MCAssembler &Asm, 11113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCAsmLayout &Layout) { 11123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCContext &Ctx = Asm.getContext(); 11133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCDataFragment *F; 11143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned EntrySize = Is64Bit ? ELF::SYMENTRY_SIZE64 : ELF::SYMENTRY_SIZE32; 11163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 111771859c640f6a36251aca223fd503c58dc314e296Rafael Espindola unsigned NumRegularSections = Asm.size(); 111871859c640f6a36251aca223fd503c58dc314e296Rafael Espindola 111938738bf1a847292003a5495f17e42a75d1274bf7Rafael Espindola // We construct .shstrtab, .symtab and .strtab in this order to match gnu as. 11204283f4b81e8c1cbf5c7a7b51e949e109ae25ff8cRafael Espindola const MCSectionELF *ShstrtabSection = 11217be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Ctx.getELFSection(".shstrtab", ELF::SHT_STRTAB, 0, 11227be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SectionKind::getReadOnly(), false); 112371859c640f6a36251aca223fd503c58dc314e296Rafael Espindola MCSectionData &ShstrtabSD = Asm.getOrCreateSectionData(*ShstrtabSection); 112471859c640f6a36251aca223fd503c58dc314e296Rafael Espindola ShstrtabSD.setAlignment(1); 112571859c640f6a36251aca223fd503c58dc314e296Rafael Espindola ShstrtabIndex = Asm.size(); 112671859c640f6a36251aca223fd503c58dc314e296Rafael Espindola 11274283f4b81e8c1cbf5c7a7b51e949e109ae25ff8cRafael Espindola const MCSectionELF *SymtabSection = 11287be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Ctx.getELFSection(".symtab", ELF::SHT_SYMTAB, 0, 11297be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SectionKind::getReadOnly(), 113034be396a12b00a95a1353c356d64868798ea3098Rafael Espindola EntrySize); 11313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSectionData &SymtabSD = Asm.getOrCreateSectionData(*SymtabSection); 11323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SymtabSD.setAlignment(Is64Bit ? 8 : 4); 11337be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SymbolTableIndex = Asm.size(); 11347be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola 11357be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola MCSectionData *SymtabShndxSD = NULL; 11367be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola 11377be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola if (NeedsSymtabShndx) { 11384283f4b81e8c1cbf5c7a7b51e949e109ae25ff8cRafael Espindola const MCSectionELF *SymtabShndxSection = 11397be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Ctx.getELFSection(".symtab_shndx", ELF::SHT_SYMTAB_SHNDX, 0, 114034be396a12b00a95a1353c356d64868798ea3098Rafael Espindola SectionKind::getReadOnly(), 4); 11417be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SymtabShndxSD = &Asm.getOrCreateSectionData(*SymtabShndxSection); 11427be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SymtabShndxSD->setAlignment(4); 11437be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola } 11443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSection *StrtabSection; 11463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StrtabSection = Ctx.getELFSection(".strtab", ELF::SHT_STRTAB, 0, 11473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionKind::getReadOnly(), false); 11483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSectionData &StrtabSD = Asm.getOrCreateSectionData(*StrtabSection); 11493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StrtabSD.setAlignment(1); 11503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StringTableIndex = Asm.size(); 11513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1152c3c413f63117896f186fc4385bdaac0578d3613fRafael Espindola WriteRelocations(Asm, Layout); 115371859c640f6a36251aca223fd503c58dc314e296Rafael Espindola 115471859c640f6a36251aca223fd503c58dc314e296Rafael Espindola // Symbol table 115571859c640f6a36251aca223fd503c58dc314e296Rafael Espindola F = new MCDataFragment(&SymtabSD); 11567be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola MCDataFragment *ShndxF = NULL; 11577be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola if (NeedsSymtabShndx) { 11587be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola ShndxF = new MCDataFragment(SymtabShndxSD); 11597be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Asm.AddSectionToTheEnd(*Writer, *SymtabShndxSD, Layout); 11607be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola } 11617be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola WriteSymbolTable(F, ShndxF, Asm, Layout, NumRegularSections); 11627070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola Asm.AddSectionToTheEnd(*Writer, SymtabSD, Layout); 116371859c640f6a36251aca223fd503c58dc314e296Rafael Espindola 11643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F = new MCDataFragment(&StrtabSD); 11653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents().append(StringTable.begin(), StringTable.end()); 11667070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola Asm.AddSectionToTheEnd(*Writer, StrtabSD, Layout); 11673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F = new MCDataFragment(&ShstrtabSD); 11693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Section header string table. 11713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 11723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // The first entry of a string table holds a null character so skip 11733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // section 0. 11743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Index = 1; 11753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += '\x00'; 11763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 11783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 11793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionELF &Section = 1180368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer static_cast<const MCSectionELF&>(it->getSection()); 118151efe7a253190b672519e8388ce5d45f1dcf1a24Rafael Espindola // FIXME: We could merge suffixes like in .text and .rela.text. 11823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Remember the index into the string table so we can write it 11843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // into the sh_name field of the section header table. 11853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionStringTableIndex[&it->getSection()] = Index; 11863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Index += Section.getSectionName().size() + 1; 11883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += Section.getSectionName(); 11893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += '\x00'; 11903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 11913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11927070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola Asm.AddSectionToTheEnd(*Writer, ShstrtabSD, Layout); 11937070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola} 11947070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 11957070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindolabool ELFObjectWriterImpl::IsFixupFullyResolved(const MCAssembler &Asm, 11967070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCValue Target, 11977070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola bool IsPCRel, 11987070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCFragment *DF) const { 11997070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola // If this is a PCrel relocation, find the section this fixup value is 12007070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola // relative to. 12017070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSection *BaseSection = 0; 12027070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (IsPCRel) { 12037070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola BaseSection = &DF->getParent()->getSection(); 12047070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola assert(BaseSection); 12057070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola } 12067070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 12077070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSection *SectionA = 0; 12087070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSymbol *SymbolA = 0; 12097070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (const MCSymbolRefExpr *A = Target.getSymA()) { 12107070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola SymbolA = &A->getSymbol(); 12117070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola SectionA = &SymbolA->getSection(); 12127070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola } 12137070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 12147070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSection *SectionB = 0; 12157070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (const MCSymbolRefExpr *B = Target.getSymB()) { 12167070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola SectionB = &B->getSymbol().getSection(); 12177070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola } 12187070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 12197070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (!BaseSection) 12207070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola return SectionA == SectionB; 12217070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 12227070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSymbolData &DataA = Asm.getSymbolData(*SymbolA); 12237070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (DataA.isExternal()) 12247070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola return false; 12257070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 12267070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola return !SectionB && BaseSection == SectionA; 12273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 12283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12298f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindolavoid ELFObjectWriterImpl::WriteObject(MCAssembler &Asm, 12303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout) { 12318f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola // Compute symbol table information. 12328f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ComputeSymbolTable(Asm); 12338f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola 12343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming CreateMetadataSections(const_cast<MCAssembler&>(Asm), 12353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const_cast<MCAsmLayout&>(Layout)); 12363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Add 1 for the null section. 12383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned NumSections = Asm.size() + 1; 1239a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t NaturalAlignment = Is64Bit ? 8 : 4; 1240a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t HeaderSize = Is64Bit ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr); 1241a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t FileOff = HeaderSize; 12423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 12443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 12453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData &SD = *it; 12463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1247a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff = RoundUpToAlignment(FileOff, SD.getAlignment()); 1248a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 12493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Get the size of the section in the output file (including padding). 12503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Size = Layout.getSectionFileSize(&SD); 1251a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 1252a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff += Size; 12533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 12543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1255a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff = RoundUpToAlignment(FileOff, NaturalAlignment); 1256a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 12573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Write out the ELF header ... 1258a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer WriteHeader(FileOff - HeaderSize, NumSections); 1259a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 1260a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff = HeaderSize; 12613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ... then all of the sections ... 12633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming DenseMap<const MCSection*, uint64_t> SectionOffsetMap; 12643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1265d8e0bfe07a7d101eeed7204d1dfcaae17ad51908Rafael Espindola DenseMap<const MCSection*, uint32_t> SectionIndexMap; 126644cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer 126744cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer unsigned Index = 1; 12683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 12693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 1270a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer const MCSectionData &SD = *it; 1271a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 1272a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t Padding = OffsetToAlignment(FileOff, SD.getAlignment()); 1273a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer WriteZeros(Padding); 1274a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff += Padding; 1275a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 12763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Remember the offset into the file for this section. 12773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionOffsetMap[&it->getSection()] = FileOff; 127844cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer SectionIndexMap[&it->getSection()] = Index++; 127944cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer 12803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming FileOff += Layout.getSectionFileSize(&SD); 12813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Asm.WriteSectionData(it, Layout, Writer); 12833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 12843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1285a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t Padding = OffsetToAlignment(FileOff, NaturalAlignment); 1286a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer WriteZeros(Padding); 1287a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff += Padding; 1288a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 12893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ... and then the section header table. 12903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Should we align the section header table? 12913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 12923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Null section first. 12937be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola uint64_t FirstSectionSize = 12947be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola NumSections >= ELF::SHN_LORESERVE ? NumSections : 0; 12957be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola uint32_t FirstSectionLink = 12967be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola ShstrtabIndex >= ELF::SHN_LORESERVE ? ShstrtabIndex : 0; 12977be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola WriteSecHdrEntry(0, 0, 0, 0, 0, FirstSectionSize, FirstSectionLink, 0, 0, 0); 12983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 13003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 13013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData &SD = *it; 13023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionELF &Section = 13033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming static_cast<const MCSectionELF&>(SD.getSection()); 13043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t sh_link = 0; 13063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t sh_info = 0; 13073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming switch(Section.getType()) { 13093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_DYNAMIC: 13103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_link = SectionStringTableIndex[&it->getSection()]; 13113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_info = 0; 13123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 13133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_REL: 1315f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman case ELF::SHT_RELA: { 13164283f4b81e8c1cbf5c7a7b51e949e109ae25ff8cRafael Espindola const MCSectionELF *SymtabSection; 13174283f4b81e8c1cbf5c7a7b51e949e109ae25ff8cRafael Espindola const MCSectionELF *InfoSection; 13183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SymtabSection = Asm.getContext().getELFSection(".symtab", ELF::SHT_SYMTAB, 0, 13203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionKind::getReadOnly(), 1321f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman false); 132244cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer sh_link = SectionIndexMap[SymtabSection]; 13233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1324377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer // Remove ".rel" and ".rela" prefixes. 1325377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer unsigned SecNameLen = (Section.getType() == ELF::SHT_REL) ? 4 : 5; 1326377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer StringRef SectionName = Section.getSectionName().substr(SecNameLen); 1327377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer 1328f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman InfoSection = Asm.getContext().getELFSection(SectionName, 13293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELF::SHT_PROGBITS, 0, 1330f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman SectionKind::getReadOnly(), 1331f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman false); 133244cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer sh_info = SectionIndexMap[InfoSection]; 13333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 1334f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman } 13353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_SYMTAB: 13373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_DYNSYM: 13383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_link = StringTableIndex; 13393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_info = LastLocalSymbolIndex; 13403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 13413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13427be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola case ELF::SHT_SYMTAB_SHNDX: 13437be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola sh_link = SymbolTableIndex; 13447be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola break; 13457be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola 13463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_PROGBITS: 13473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_STRTAB: 13483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_NOBITS: 134919dc7faf25e3a8cc37a656b74ebeef3ab976aa8eBenjamin Kramer case ELF::SHT_NULL: 1350cecbc3d28277ff4916326311cbf87335ed05d106Rafael Espindola case ELF::SHT_ARM_ATTRIBUTES: 13513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Nothing to do. 13523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 13533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming default: 13553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(0 && "FIXME: sh_type value not supported!"); 13563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 13573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 13583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSecHdrEntry(SectionStringTableIndex[&it->getSection()], 13603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Section.getType(), Section.getFlags(), 136171859c640f6a36251aca223fd503c58dc314e296Rafael Espindola 0, 13623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionOffsetMap.lookup(&SD.getSection()), 13633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Layout.getSectionSize(&SD), sh_link, 13643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_info, SD.getAlignment(), 13653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Section.getEntrySize()); 13663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 13673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 13683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13693565a06ebf44a193a8b333cbeff2ee154298d450Matt FlemingELFObjectWriter::ELFObjectWriter(raw_ostream &OS, 13703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool Is64Bit, 13715baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky Triple::OSType OSType, 1372eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck uint16_t EMachine, 13733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool IsLittleEndian, 13743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool HasRelocationAddend) 13753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming : MCObjectWriter(OS, IsLittleEndian) 13763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming{ 1377eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck Impl = new ELFObjectWriterImpl(this, Is64Bit, EMachine, 1378eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck HasRelocationAddend, OSType); 13793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 13803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13813565a06ebf44a193a8b333cbeff2ee154298d450Matt FlemingELFObjectWriter::~ELFObjectWriter() { 13823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming delete (ELFObjectWriterImpl*) Impl; 13833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 13843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13853565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm) { 13863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ((ELFObjectWriterImpl*) Impl)->ExecutePostLayoutBinding(Asm); 13873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 13883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13893565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriter::RecordRelocation(const MCAssembler &Asm, 13903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout, 13913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFragment *Fragment, 13923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFixup &Fixup, MCValue Target, 13933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t &FixedValue) { 13943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ((ELFObjectWriterImpl*) Impl)->RecordRelocation(Asm, Layout, Fragment, Fixup, 13953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Target, FixedValue); 13963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 13973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13987070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindolabool ELFObjectWriter::IsFixupFullyResolved(const MCAssembler &Asm, 13997070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCValue Target, 14007070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola bool IsPCRel, 14017070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCFragment *DF) const { 14027070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola return ((ELFObjectWriterImpl*) Impl)->IsFixupFullyResolved(Asm, Target, 14037070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola IsPCRel, DF); 14047070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola} 14057070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 14068f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindolavoid ELFObjectWriter::WriteObject(MCAssembler &Asm, 14073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout) { 14083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ((ELFObjectWriterImpl*) Impl)->WriteObject(Asm, Layout); 14093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 1410