ELFObjectWriter.cpp revision 4283f4b81e8c1cbf5c7a7b51e949e109ae25ff8c
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 String8(char *buf, uint8_t Value) { 2183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[0] = Value; 2193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringLE16(char *buf, uint16_t Value) { 2223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[0] = char(Value >> 0); 2233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[1] = char(Value >> 8); 2243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringLE32(char *buf, uint32_t Value) { 22736c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer StringLE16(buf, uint16_t(Value >> 0)); 228c522f6e70b02d161e4bf37023edb20643ee34acfBenjamin Kramer StringLE16(buf + 2, uint16_t(Value >> 16)); 2293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringLE64(char *buf, uint64_t Value) { 23236c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer StringLE32(buf, uint32_t(Value >> 0)); 233c522f6e70b02d161e4bf37023edb20643ee34acfBenjamin Kramer StringLE32(buf + 4, uint32_t(Value >> 32)); 2343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringBE16(char *buf ,uint16_t Value) { 2373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[0] = char(Value >> 8); 2383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[1] = char(Value >> 0); 2393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringBE32(char *buf, uint32_t Value) { 24236c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer StringBE16(buf, uint16_t(Value >> 16)); 243c522f6e70b02d161e4bf37023edb20643ee34acfBenjamin Kramer StringBE16(buf + 2, uint16_t(Value >> 0)); 2443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringBE64(char *buf, uint64_t Value) { 24736c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer StringBE32(buf, uint32_t(Value >> 32)); 248c522f6e70b02d161e4bf37023edb20643ee34acfBenjamin Kramer StringBE32(buf + 4, uint32_t(Value >> 0)); 2493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void String16(char *buf, uint16_t Value) { 2523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Writer->isLittleEndian()) 253f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringLE16(buf, Value); 2543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming else 255f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringBE16(buf, Value); 2563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void String32(char *buf, uint32_t Value) { 2593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Writer->isLittleEndian()) 260f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringLE32(buf, Value); 2613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming else 262f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringBE32(buf, Value); 2633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void String64(char *buf, uint64_t Value) { 2663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Writer->isLittleEndian()) 267f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringLE64(buf, Value); 2683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming else 269f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringBE64(buf, Value); 2703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteHeader(uint64_t SectionDataSize, unsigned NumberOfSections); 2733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2747be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola void WriteSymbolEntry(MCDataFragment *SymtabF, MCDataFragment *ShndxF, 2757be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola uint64_t name, uint8_t info, 2763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t value, uint64_t size, 2777be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola uint8_t other, uint32_t shndx, 2787be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola bool Reserved); 2793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2807be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola void WriteSymbol(MCDataFragment *SymtabF, MCDataFragment *ShndxF, 2817be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola ELFSymbolData &MSD, 2823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout); 2833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2847be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola void WriteSymbolTable(MCDataFragment *SymtabF, MCDataFragment *ShndxF, 2857be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola const MCAssembler &Asm, 28671859c640f6a36251aca223fd503c58dc314e296Rafael Espindola const MCAsmLayout &Layout, 28771859c640f6a36251aca223fd503c58dc314e296Rafael Espindola unsigned NumRegularSections); 2883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void RecordRelocation(const MCAssembler &Asm, const MCAsmLayout &Layout, 2903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFragment *Fragment, const MCFixup &Fixup, 2913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCValue Target, uint64_t &FixedValue); 2923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2930b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin Kramer uint64_t getSymbolIndexInSymbolTable(const MCAssembler &Asm, 2940b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin Kramer const MCSymbol *S); 2953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// ComputeSymbolTable - Compute the symbol table data 2973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// 2983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// \param StringTable [out] - The string table data. 2993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// \param StringIndexMap [out] - Map from symbol names to offsets in the 3003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// string table. 3013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void ComputeSymbolTable(MCAssembler &Asm); 3023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout, 3043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData &SD); 3053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteRelocations(MCAssembler &Asm, MCAsmLayout &Layout) { 3073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 3083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 3093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteRelocation(Asm, Layout, *it); 3103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 3113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 3123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void CreateMetadataSections(MCAssembler &Asm, MCAsmLayout &Layout); 3143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 31588182132470527e27231f09b25a885893e528c66Rafael Espindola void ExecutePostLayoutBinding(MCAssembler &Asm); 3163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteSecHdrEntry(uint32_t Name, uint32_t Type, uint64_t Flags, 3183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Address, uint64_t Offset, 3193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Size, uint32_t Link, uint32_t Info, 3203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Alignment, uint64_t EntrySize); 3213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteRelocationsFragment(const MCAssembler &Asm, MCDataFragment *F, 3233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData *SD); 3243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3257070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola bool IsFixupFullyResolved(const MCAssembler &Asm, 3267070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCValue Target, 3277070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola bool IsPCRel, 3287070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCFragment *DF) const; 3297070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 3308f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola void WriteObject(MCAssembler &Asm, const MCAsmLayout &Layout); 3313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming }; 3323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 3343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// Emit the ELF header. 3363565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteHeader(uint64_t SectionDataSize, 3373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned NumberOfSections) { 3383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ELF Header 3393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ---------- 3403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 3413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Note 3423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ---- 3433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // emitWord method behaves differently for ELF32 and ELF64, writing 3443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 4 bytes in the former and 8 in the latter. 3453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(0x7f); // e_ident[EI_MAG0] 3473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8('E'); // e_ident[EI_MAG1] 3483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8('L'); // e_ident[EI_MAG2] 3493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8('F'); // e_ident[EI_MAG3] 3503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(Is64Bit ? ELF::ELFCLASS64 : ELF::ELFCLASS32); // e_ident[EI_CLASS] 3523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_ident[EI_DATA] 3543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(Writer->isLittleEndian() ? ELF::ELFDATA2LSB : ELF::ELFDATA2MSB); 3553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(ELF::EV_CURRENT); // e_ident[EI_VERSION] 3575baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky // e_ident[EI_OSABI] 3585baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky switch (OSType) { 3595baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky case Triple::FreeBSD: Write8(ELF::ELFOSABI_FREEBSD); break; 3605baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky case Triple::Linux: Write8(ELF::ELFOSABI_LINUX); break; 3615baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky default: Write8(ELF::ELFOSABI_NONE); break; 3625baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky } 3633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(0); // e_ident[EI_ABIVERSION] 3643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteZeros(ELF::EI_NIDENT - ELF::EI_PAD); 3663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(ELF::ET_REL); // e_type 3683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 369eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck Write16(EMachine); // e_machine = target 3703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(ELF::EV_CURRENT); // e_version 3723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(0); // e_entry, no entry point in .o file 3733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(0); // e_phoff, no program header for .o 374eb97677764beb115c658ac559d3649c6c4068eb9Benjamin Kramer WriteWord(SectionDataSize + (Is64Bit ? sizeof(ELF::Elf64_Ehdr) : 375eb97677764beb115c658ac559d3649c6c4068eb9Benjamin Kramer sizeof(ELF::Elf32_Ehdr))); // e_shoff = sec hdr table off in bytes 3763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // FIXME: Make this configurable. 3783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(0); // e_flags = whatever the target wants 3793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_ehsize = ELF header size 3813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(Is64Bit ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr)); 3823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(0); // e_phentsize = prog header entry size 3843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(0); // e_phnum = # prog header entries = 0 3853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_shentsize = Section header entry size 3873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(Is64Bit ? sizeof(ELF::Elf64_Shdr) : sizeof(ELF::Elf32_Shdr)); 3883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_shnum = # of section header ents 3907be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola if (NumberOfSections >= ELF::SHN_LORESERVE) 3917be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Write16(0); 3927be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola else 3937be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Write16(NumberOfSections); 3943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_shstrndx = Section # of '.shstrtab' 3967be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola if (NumberOfSections >= ELF::SHN_LORESERVE) 3977be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Write16(ELF::SHN_XINDEX); 3987be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola else 3997be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Write16(ShstrtabIndex); 4003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 4013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4027be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindolavoid ELFObjectWriterImpl::WriteSymbolEntry(MCDataFragment *SymtabF, 4037be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola MCDataFragment *ShndxF, 4047be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola uint64_t name, 4053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint8_t info, uint64_t value, 4063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t size, uint8_t other, 4077be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola uint32_t shndx, 4087be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola bool Reserved) { 4097be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola if (ShndxF) { 4107be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola char buf[4]; 4117be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola if (shndx >= ELF::SHN_LORESERVE && !Reserved) 4127be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola String32(buf, shndx); 4137be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola else 4147be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola String32(buf, 0); 4157be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola ShndxF->getContents() += StringRef(buf, 4); 4167be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola } 4177be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola 4183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Is64Bit) { 4193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming char buf[8]; 4203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String32(buf, name); 4227be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SymtabF->getContents() += StringRef(buf, 4); // st_name 4233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String8(buf, info); 4257be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SymtabF->getContents() += StringRef(buf, 1); // st_info 426368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer 4273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String8(buf, other); 4287be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SymtabF->getContents() += StringRef(buf, 1); // st_other 4297be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola 4307be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola if (shndx >= ELF::SHN_LORESERVE && !Reserved) 4317be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola String16(buf, ELF::SHN_XINDEX); 4327be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola else 4337be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola String16(buf, shndx); 4343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4357be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SymtabF->getContents() += StringRef(buf, 2); // st_shndx 4363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String64(buf, value); 4387be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SymtabF->getContents() += StringRef(buf, 8); // st_value 4393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String64(buf, size); 4417be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SymtabF->getContents() += StringRef(buf, 8); // st_size 4423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 4433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming char buf[4]; 4443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String32(buf, name); 4467be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SymtabF->getContents() += StringRef(buf, 4); // st_name 4473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String32(buf, value); 4497be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SymtabF->getContents() += StringRef(buf, 4); // st_value 4503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String32(buf, size); 4527be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SymtabF->getContents() += StringRef(buf, 4); // st_size 4533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String8(buf, info); 4557be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SymtabF->getContents() += StringRef(buf, 1); // st_info 4563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String8(buf, other); 4587be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SymtabF->getContents() += StringRef(buf, 1); // st_other 4597be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola 4607be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola if (shndx >= ELF::SHN_LORESERVE && !Reserved) 4617be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola String16(buf, ELF::SHN_XINDEX); 4627be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola else 4637be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola String16(buf, shndx); 4643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4657be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SymtabF->getContents() += StringRef(buf, 2); // st_shndx 4663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 4673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 4683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4692c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindolastatic uint64_t SymbolValue(MCSymbolData &Data, const MCAsmLayout &Layout) { 4702c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola if (Data.isCommon() && Data.isExternal()) 4712c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola return Data.getCommonAlignment(); 4722c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola 4732c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola const MCSymbol &Symbol = Data.getSymbol(); 4742c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola if (!Symbol.isInSection()) 4752c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola return 0; 4762c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola 4771973d4379250a88938a9358c12d96e96bdc8dedeRafael Espindola if (MCFragment *FF = Data.getFragment()) 4781973d4379250a88938a9358c12d96e96bdc8dedeRafael Espindola return Layout.getSymbolAddress(&Data) - 4791973d4379250a88938a9358c12d96e96bdc8dedeRafael Espindola Layout.getSectionAddress(FF->getParent()); 4802c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola 4812c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola return 0; 4822c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola} 4832c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola 484de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindolastatic const MCSymbol &AliasedSymbol(const MCSymbol &Symbol) { 485de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola const MCSymbol *S = &Symbol; 486de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola while (S->isVariable()) { 487de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola const MCExpr *Value = S->getVariableValue(); 488a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola if (Value->getKind() != MCExpr::SymbolRef) 489a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola return *S; 490152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola const MCSymbolRefExpr *Ref = static_cast<const MCSymbolRefExpr*>(Value); 491de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola S = &Ref->getSymbol(); 492152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola } 493de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola return *S; 494de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola} 495de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola 49688182132470527e27231f09b25a885893e528c66Rafael Espindolavoid ELFObjectWriterImpl::ExecutePostLayoutBinding(MCAssembler &Asm) { 49788182132470527e27231f09b25a885893e528c66Rafael Espindola // The presence of symbol versions causes undefined symbols and 49888182132470527e27231f09b25a885893e528c66Rafael Espindola // versions declared with @@@ to be renamed. 49988182132470527e27231f09b25a885893e528c66Rafael Espindola 50088182132470527e27231f09b25a885893e528c66Rafael Espindola for (MCAssembler::symbol_iterator it = Asm.symbol_begin(), 50188182132470527e27231f09b25a885893e528c66Rafael Espindola ie = Asm.symbol_end(); it != ie; ++it) { 50288182132470527e27231f09b25a885893e528c66Rafael Espindola const MCSymbol &Alias = it->getSymbol(); 50388182132470527e27231f09b25a885893e528c66Rafael Espindola const MCSymbol &Symbol = AliasedSymbol(Alias); 504f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola MCSymbolData &SD = Asm.getSymbolData(Symbol); 505f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola 506f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola // Undefined symbols are global, but this is the first place we 507f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola // are able to set it. 508f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola if (Symbol.isUndefined() && !Symbol.isVariable()) { 509f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola if (GetBinding(SD) == ELF::STB_LOCAL) { 510f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola SetBinding(SD, ELF::STB_GLOBAL); 511f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola SetBinding(*it, ELF::STB_GLOBAL); 512f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola } 513f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola } 514f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola 515f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola // Not an alias. 516f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola if (&Symbol == &Alias) 517f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola continue; 518f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola 51907ee63283cc2b9a4d6c98ecd30d1b721fe3cb29aBenjamin Kramer StringRef AliasName = Alias.getName(); 52088182132470527e27231f09b25a885893e528c66Rafael Espindola size_t Pos = AliasName.find('@'); 52188182132470527e27231f09b25a885893e528c66Rafael Espindola if (Pos == StringRef::npos) 52288182132470527e27231f09b25a885893e528c66Rafael Espindola continue; 52388182132470527e27231f09b25a885893e528c66Rafael Espindola 524f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola // Aliases defined with .symvar copy the binding from the symbol they alias. 525f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola // This is the first place we are able to copy this information. 526f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola it->setExternal(SD.isExternal()); 527f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola SetBinding(*it, GetBinding(SD)); 528f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola 52907ee63283cc2b9a4d6c98ecd30d1b721fe3cb29aBenjamin Kramer StringRef Rest = AliasName.substr(Pos); 53088182132470527e27231f09b25a885893e528c66Rafael Espindola if (!Symbol.isUndefined() && !Rest.startswith("@@@")) 53188182132470527e27231f09b25a885893e528c66Rafael Espindola continue; 53288182132470527e27231f09b25a885893e528c66Rafael Espindola 53383ff4d2b0d6133d48055a27fe25c5d241bca7e9bRafael Espindola // FIXME: produce a better error message. 53483ff4d2b0d6133d48055a27fe25c5d241bca7e9bRafael Espindola if (Symbol.isUndefined() && Rest.startswith("@@") && 53583ff4d2b0d6133d48055a27fe25c5d241bca7e9bRafael Espindola !Rest.startswith("@@@")) 53683ff4d2b0d6133d48055a27fe25c5d241bca7e9bRafael Espindola report_fatal_error("A @@ version cannot be undefined"); 53783ff4d2b0d6133d48055a27fe25c5d241bca7e9bRafael Espindola 53807ee63283cc2b9a4d6c98ecd30d1b721fe3cb29aBenjamin Kramer Renames.insert(std::make_pair(&Symbol, &Alias)); 53988182132470527e27231f09b25a885893e528c66Rafael Espindola } 54088182132470527e27231f09b25a885893e528c66Rafael Espindola} 54188182132470527e27231f09b25a885893e528c66Rafael Espindola 5427be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindolavoid ELFObjectWriterImpl::WriteSymbol(MCDataFragment *SymtabF, 5437be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola MCDataFragment *ShndxF, 5447be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola ELFSymbolData &MSD, 545de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola const MCAsmLayout &Layout) { 546de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola MCSymbolData &OrigData = *MSD.SymbolData; 547de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola MCSymbolData &Data = 548de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola Layout.getAssembler().getSymbolData(AliasedSymbol(OrigData.getSymbol())); 549152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola 5507be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola bool IsReserved = Data.isCommon() || Data.getSymbol().isAbsolute() || 5517be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Data.getSymbol().isVariable(); 5527be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola 553152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Binding = GetBinding(OrigData); 554152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Visibility = GetVisibility(OrigData); 555152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Type = GetType(Data); 556152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola 557152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Info = (Binding << ELF_STB_Shift) | (Type << ELF_STT_Shift); 558152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Other = Visibility; 559152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola 5602c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola uint64_t Value = SymbolValue(Data, Layout); 5613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Size = 0; 5623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCExpr *ESize; 5633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 564f7c10a3cff61c70efe8e405d9bdc5386e8e3fc0aRafael Espindola assert(!(Data.isCommon() && !Data.isExternal())); 565f7c10a3cff61c70efe8e405d9bdc5386e8e3fc0aRafael Espindola 5663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ESize = Data.getSize(); 5673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Data.getSize()) { 5683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCValue Res; 5693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (ESize->getKind() == MCExpr::Binary) { 5703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(ESize); 5713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (BE->EvaluateAsRelocatable(Res, &Layout)) { 57324f1206c7de0f21d309d27737071ad742d5ddf27Benjamin Kramer assert(!Res.getSymA() || !Res.getSymA()->getSymbol().isDefined()); 57424f1206c7de0f21d309d27737071ad742d5ddf27Benjamin Kramer assert(!Res.getSymB() || !Res.getSymB()->getSymbol().isDefined()); 575f230df9af4012f9510de664b6d62b128e26a5861Rafael Espindola Size = Res.getConstant(); 5763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else if (ESize->getKind() == MCExpr::Constant) { 578368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer Size = static_cast<const MCConstantExpr *>(ESize)->getValue(); 5793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 5803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(0 && "Unsupported size expression"); 5813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Write out the symbol table entry 5857be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola WriteSymbolEntry(SymtabF, ShndxF, MSD.StringIndex, Info, Value, 5867be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Size, Other, MSD.SectionIndex, IsReserved); 5873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 5883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5897be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindolavoid ELFObjectWriterImpl::WriteSymbolTable(MCDataFragment *SymtabF, 5907be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola MCDataFragment *ShndxF, 5913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAssembler &Asm, 59271859c640f6a36251aca223fd503c58dc314e296Rafael Espindola const MCAsmLayout &Layout, 59371859c640f6a36251aca223fd503c58dc314e296Rafael Espindola unsigned NumRegularSections) { 5943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // The string table must be emitted first because we need the index 5953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // into the string table for all the symbol names. 5963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(StringTable.size() && "Missing string table"); 5973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // FIXME: Make sure the start of the symbol table is aligned. 5993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // The first entry is the undefined symbol entry. 6017be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola WriteSymbolEntry(SymtabF, ShndxF, 0, 0, 0, 0, 0, 0, false); 6023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Write the symbol table entries. 6043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LastLocalSymbolIndex = LocalSymbolData.size() + 1; 6053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = LocalSymbolData.size(); i != e; ++i) { 6063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData &MSD = LocalSymbolData[i]; 6077be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola WriteSymbol(SymtabF, ShndxF, MSD, Layout); 6083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 6093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 61071859c640f6a36251aca223fd503c58dc314e296Rafael Espindola // Write out a symbol table entry for each regular section. 611a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman unsigned Index = 1; 61271859c640f6a36251aca223fd503c58dc314e296Rafael Espindola for (MCAssembler::const_iterator it = Asm.begin(); 61371859c640f6a36251aca223fd503c58dc314e296Rafael Espindola Index <= NumRegularSections; ++it, ++Index) { 614a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman const MCSectionELF &Section = 615368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer static_cast<const MCSectionELF&>(it->getSection()); 616a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman // Leave out relocations so we don't have indexes within 617a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman // the relocations messed up 618377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer if (Section.getType() == ELF::SHT_RELA || Section.getType() == ELF::SHT_REL) 619a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman continue; 6207be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola WriteSymbolEntry(SymtabF, ShndxF, 0, ELF::STT_SECTION, 0, 0, 6217be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola ELF::STV_DEFAULT, Index, false); 622a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman LastLocalSymbolIndex++; 623a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman } 6243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = ExternalSymbolData.size(); i != e; ++i) { 6263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData &MSD = ExternalSymbolData[i]; 6273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData &Data = *MSD.SymbolData; 6283223f19ff0920ffee686faba3bf74babf580e8a5Rafael Espindola assert(((Data.getFlags() & ELF_STB_Global) || 6293223f19ff0920ffee686faba3bf74babf580e8a5Rafael Espindola (Data.getFlags() & ELF_STB_Weak)) && 6303223f19ff0920ffee686faba3bf74babf580e8a5Rafael Espindola "External symbol requires STB_GLOBAL or STB_WEAK flag"); 6317be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola WriteSymbol(SymtabF, ShndxF, MSD, Layout); 632e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola if (GetBinding(Data) == ELF::STB_LOCAL) 6333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LastLocalSymbolIndex++; 6343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 6353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i) { 6373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData &MSD = UndefinedSymbolData[i]; 6383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData &Data = *MSD.SymbolData; 6397be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola WriteSymbol(SymtabF, ShndxF, MSD, Layout); 640e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola if (GetBinding(Data) == ELF::STB_LOCAL) 6413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LastLocalSymbolIndex++; 6423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 6433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 6443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6457eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindolastatic bool ShouldRelocOnSymbol(const MCSymbolData &SD, 6463729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola const MCValue &Target, 6473729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola const MCFragment &F) { 6487eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola const MCSymbol &Symbol = SD.getSymbol(); 6497eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola if (Symbol.isUndefined()) 6507eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola return true; 6517eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola 6527eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola const MCSectionELF &Section = 6537eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola static_cast<const MCSectionELF&>(Symbol.getSection()); 6547eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola 6557eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola if (SD.isExternal()) 6567eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola return true; 6577eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola 6588cecf253e45f144b9a7fd0ace85eeeeb0bebfc83Rafael Espindola MCSymbolRefExpr::VariantKind Kind = Target.getSymA()->getKind(); 6593729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola const MCSectionELF &Sec2 = 6603729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola static_cast<const MCSectionELF&>(F.getParent()->getSection()); 6613729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola 662ce2d3c57758619e99a99104e1168a9558658fab0Rafael Espindola if (Section.getKind().isBSS()) 663ce2d3c57758619e99a99104e1168a9558658fab0Rafael Espindola return false; 664ce2d3c57758619e99a99104e1168a9558658fab0Rafael Espindola 6658cecf253e45f144b9a7fd0ace85eeeeb0bebfc83Rafael Espindola if (&Sec2 != &Section && 666c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola (Kind == MCSymbolRefExpr::VK_PLT || 667c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola Kind == MCSymbolRefExpr::VK_GOTPCREL || 668c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola Kind == MCSymbolRefExpr::VK_GOTOFF)) 6693729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola return true; 6703729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola 671c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola if (Section.getFlags() & MCSectionELF::SHF_MERGE) 672c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola return Target.getConstant() != 0; 673c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola 6747eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola return false; 67573ffea47d20bc9f559b4ce0c60166ee504073832Rafael Espindola} 67673ffea47d20bc9f559b4ce0c60166ee504073832Rafael Espindola 677e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer// FIXME: this is currently X86/X86_64 only 6783565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::RecordRelocation(const MCAssembler &Asm, 6793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout, 6803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFragment *Fragment, 6813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFixup &Fixup, 6823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCValue Target, 6833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t &FixedValue) { 6843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming int64_t Addend = 0; 6858f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola int Index = 0; 68695c602ade3aa30de17abd53b85968a3feb8fdfbcBenjamin Kramer int64_t Value = Target.getConstant(); 6878f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola const MCSymbol *Symbol = 0; 68829129728f1d4febe44792d1481077cc47fe83a08Rafael Espindola const MCSymbol *Renamed = 0; 6893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6900007489312ecb1b51ae275f1e452786480151a4cRafael Espindola bool IsPCRel = isFixupKindX86PCRel(Fixup.getKind()); 69181cfb8529b7fd1e98fefb79fb46b10301b93ab75Benjamin Kramer if (!Target.isAbsolute()) { 692de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola Symbol = &AliasedSymbol(Target.getSymA()->getSymbol()); 69329129728f1d4febe44792d1481077cc47fe83a08Rafael Espindola Renamed = Renames.lookup(Symbol); 69429129728f1d4febe44792d1481077cc47fe83a08Rafael Espindola if (!Renamed) 695484291c27319668ad99cb87def000254357736fbRafael Espindola Renamed = &Target.getSymA()->getSymbol(); 6963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData &SD = Asm.getSymbolData(*Symbol); 69763d37b932278724d51e7f8bd1f2574c7b45f85f0Benjamin Kramer MCFragment *F = SD.getFragment(); 6983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6999d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola if (const MCSymbolRefExpr *RefB = Target.getSymB()) { 7009d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola const MCSymbol &SymbolB = RefB->getSymbol(); 7019d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola MCSymbolData &SDB = Asm.getSymbolData(SymbolB); 7029d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola IsPCRel = true; 70355fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola MCSectionData *Sec = Fragment->getParent(); 70455fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola 70555fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola // Offset of the symbol in the section 70655fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola int64_t a = Layout.getSymbolAddress(&SDB) - Layout.getSectionAddress(Sec); 70755fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola 70855fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola // Ofeset of the relocation in the section 70955fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola int64_t b = Layout.getFragmentOffset(Fragment) + Fixup.getOffset(); 71055fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola Value += b - a; 7119d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola } 7129d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola 7137eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola // Check that this case has already been fully resolved before we get 7147eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola // here. 7150007489312ecb1b51ae275f1e452786480151a4cRafael Espindola if (Symbol->isDefined() && !SD.isExternal() && 7160007489312ecb1b51ae275f1e452786480151a4cRafael Espindola IsPCRel && 7170007489312ecb1b51ae275f1e452786480151a4cRafael Espindola &Fragment->getParent()->getSection() == &Symbol->getSection()) { 7187eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola llvm_unreachable("We don't need a relocation in this case."); 7190007489312ecb1b51ae275f1e452786480151a4cRafael Espindola return; 7200007489312ecb1b51ae275f1e452786480151a4cRafael Espindola } 7210007489312ecb1b51ae275f1e452786480151a4cRafael Espindola 7223729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola bool RelocOnSymbol = ShouldRelocOnSymbol(SD, Target, *Fragment); 7237eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola if (!RelocOnSymbol) { 7248f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola Index = F->getParent()->getOrdinal(); 7257eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola 7267eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola MCSectionData *FSD = F->getParent(); 7277eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola // Offset of the symbol in the section 7287eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola Value += Layout.getSymbolAddress(&SD) - Layout.getSectionAddress(FSD); 7298f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola } else { 73029129728f1d4febe44792d1481077cc47fe83a08Rafael Espindola UsedInReloc.insert(Renamed); 731484291c27319668ad99cb87def000254357736fbRafael Espindola MCSymbolData &RenamedSD = Asm.getSymbolData(*Renamed); 732484291c27319668ad99cb87def000254357736fbRafael Espindola if (RenamedSD.getFlags() & ELF_Other_Weakref) { 733484291c27319668ad99cb87def000254357736fbRafael Espindola WeakrefUsedInReloc.insert(Symbol); 734484291c27319668ad99cb87def000254357736fbRafael Espindola } 7358f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola Index = -1; 7368f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola } 7377eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola Addend = Value; 7387eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola // Compensate for the addend on i386. 7397eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola if (Is64Bit) 7407eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola Value = 0; 7413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 7423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 74395c602ade3aa30de17abd53b85968a3feb8fdfbcBenjamin Kramer FixedValue = Value; 74495c602ade3aa30de17abd53b85968a3feb8fdfbcBenjamin Kramer 7453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // determine the type of the relocation 74628f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola 74728f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola MCSymbolRefExpr::VariantKind Modifier = Target.getSymA()->getKind(); 74863d37b932278724d51e7f8bd1f2574c7b45f85f0Benjamin Kramer unsigned Type; 749e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer if (Is64Bit) { 750e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer if (IsPCRel) { 75192bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola switch (Modifier) { 7529edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola default: 7539edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola llvm_unreachable("Unimplemented"); 75492bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola case MCSymbolRefExpr::VK_None: 75592bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola Type = ELF::R_X86_64_PC32; 75692bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola break; 75792bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola case MCSymbolRefExpr::VK_PLT: 75892bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola Type = ELF::R_X86_64_PLT32; 75992bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola break; 760a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_GOTPCREL: 761607d1f6d3216b647c07965bafae8d1aba6312136Rafael Espindola Type = ELF::R_X86_64_GOTPCREL; 762607d1f6d3216b647c07965bafae8d1aba6312136Rafael Espindola break; 763bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola case MCSymbolRefExpr::VK_GOTTPOFF: 764bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola Type = ELF::R_X86_64_GOTTPOFF; 765bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola break; 766bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola case MCSymbolRefExpr::VK_TLSGD: 767bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola Type = ELF::R_X86_64_TLSGD; 768bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola break; 769b4d1721eff7b43577e5f2e53f885973fb6c43683Rafael Espindola case MCSymbolRefExpr::VK_TLSLD: 770b4d1721eff7b43577e5f2e53f885973fb6c43683Rafael Espindola Type = ELF::R_X86_64_TLSLD; 771b4d1721eff7b43577e5f2e53f885973fb6c43683Rafael Espindola break; 77292bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola } 773e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } else { 774e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer switch ((unsigned)Fixup.getKind()) { 775e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer default: llvm_unreachable("invalid fixup kind!"); 776e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_8: Type = ELF::R_X86_64_64; break; 777a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola case X86::reloc_signed_4byte: 778e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case X86::reloc_pcrel_4byte: 779a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola assert(isInt<32>(Target.getConstant())); 78028f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola switch (Modifier) { 7819edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola default: 7829edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola llvm_unreachable("Unimplemented"); 78328f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola case MCSymbolRefExpr::VK_None: 78428f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola Type = ELF::R_X86_64_32S; 78528f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola break; 78628f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola case MCSymbolRefExpr::VK_GOT: 78728f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola Type = ELF::R_X86_64_GOT32; 78828f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola break; 789c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola case MCSymbolRefExpr::VK_GOTPCREL: 7908cecf253e45f144b9a7fd0ace85eeeeb0bebfc83Rafael Espindola Type = ELF::R_X86_64_GOTPCREL; 7918cecf253e45f144b9a7fd0ace85eeeeb0bebfc83Rafael Espindola break; 792bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola case MCSymbolRefExpr::VK_TPOFF: 793bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola Type = ELF::R_X86_64_TPOFF32; 794bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola break; 795aa8f1f01352bdaaabf712369f8a8a615c776b508Rafael Espindola case MCSymbolRefExpr::VK_DTPOFF: 796aa8f1f01352bdaaabf712369f8a8a615c776b508Rafael Espindola Type = ELF::R_X86_64_DTPOFF32; 797aa8f1f01352bdaaabf712369f8a8a615c776b508Rafael Espindola break; 79828f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola } 799a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola break; 800e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_4: 801a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola Type = ELF::R_X86_64_32; 802e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer break; 803e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_2: Type = ELF::R_X86_64_16; break; 804e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case X86::reloc_pcrel_1byte: 805e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_1: Type = ELF::R_X86_64_8; break; 806e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } 807e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } 8083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 809e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer if (IsPCRel) { 8109edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola switch (Modifier) { 8119edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola default: 81224dc9ecdc55d732ac93fc782d6232413fe2c1160Rafael Espindola llvm_unreachable("Unimplemented"); 81324dc9ecdc55d732ac93fc782d6232413fe2c1160Rafael Espindola case MCSymbolRefExpr::VK_None: 8149baee3b3a3924bc45d007e54c71333739d135f8eRafael Espindola Type = ELF::R_386_PC32; 8159baee3b3a3924bc45d007e54c71333739d135f8eRafael Espindola break; 8169edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola case MCSymbolRefExpr::VK_PLT: 8179edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola Type = ELF::R_386_PLT32; 8189edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola break; 8199edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola } 820e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } else { 821e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer switch ((unsigned)Fixup.getKind()) { 822e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer default: llvm_unreachable("invalid fixup kind!"); 823a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola 82424ba4f7f5f27c8d64be7ad653863b33594e5f019Rafael Espindola case X86::reloc_global_offset_table: 82524ba4f7f5f27c8d64be7ad653863b33594e5f019Rafael Espindola Type = ELF::R_386_GOTPC; 82624ba4f7f5f27c8d64be7ad653863b33594e5f019Rafael Espindola break; 82724ba4f7f5f27c8d64be7ad653863b33594e5f019Rafael Espindola 828a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola // FIXME: Should we avoid selecting reloc_signed_4byte in 32 bit mode 829a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola // instead? 830a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola case X86::reloc_signed_4byte: 831e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case X86::reloc_pcrel_4byte: 832bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola case FK_Data_4: 833c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola switch (Modifier) { 8349edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola default: 8359edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola llvm_unreachable("Unimplemented"); 836bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola case MCSymbolRefExpr::VK_None: 83724ba4f7f5f27c8d64be7ad653863b33594e5f019Rafael Espindola Type = ELF::R_386_32; 838bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola break; 839eada30479399014c22c7b7edb008177c312eefeeRafael Espindola case MCSymbolRefExpr::VK_GOT: 840eada30479399014c22c7b7edb008177c312eefeeRafael Espindola Type = ELF::R_386_GOT32; 841eada30479399014c22c7b7edb008177c312eefeeRafael Espindola break; 842c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola case MCSymbolRefExpr::VK_GOTOFF: 843c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola Type = ELF::R_386_GOTOFF; 844c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola break; 8453cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola case MCSymbolRefExpr::VK_TLSGD: 8463cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola Type = ELF::R_386_TLS_GD; 8473cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola break; 8483cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola case MCSymbolRefExpr::VK_TPOFF: 8493cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola Type = ELF::R_386_TLS_LE_32; 8503cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola break; 8513cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola case MCSymbolRefExpr::VK_INDNTPOFF: 8523cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola Type = ELF::R_386_TLS_IE; 8533cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola break; 8543cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola case MCSymbolRefExpr::VK_NTPOFF: 8553cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola Type = ELF::R_386_TLS_LE; 8563cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola break; 857a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_GOTNTPOFF: 858a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola Type = ELF::R_386_TLS_GOTIE; 859a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola break; 860a264f72d3fb9dec1427480fcf17ef3c746ea723aRafael Espindola case MCSymbolRefExpr::VK_TLSLDM: 861a264f72d3fb9dec1427480fcf17ef3c746ea723aRafael Espindola Type = ELF::R_386_TLS_LDM; 862a264f72d3fb9dec1427480fcf17ef3c746ea723aRafael Espindola break; 8630cf15d61b7e3bf53f5a99f58ada37b93bc039559Rafael Espindola case MCSymbolRefExpr::VK_DTPOFF: 8640cf15d61b7e3bf53f5a99f58ada37b93bc039559Rafael Espindola Type = ELF::R_386_TLS_LDO_32; 8650cf15d61b7e3bf53f5a99f58ada37b93bc039559Rafael Espindola break; 866c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola } 867c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola break; 868e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_2: Type = ELF::R_386_16; break; 869e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case X86::reloc_pcrel_1byte: 870e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_1: Type = ELF::R_386_8; break; 871e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } 8723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 8733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 8743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 875a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola if (RelocNeedsGOT(Modifier)) 8765c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola NeedsGOT = true; 8775c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola 878e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer ELFRelocationEntry ERE; 879e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer 8808f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ERE.Index = Index; 8818f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ERE.Type = Type; 88229129728f1d4febe44792d1481077cc47fe83a08Rafael Espindola ERE.Symbol = Renamed; 8833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 88463d37b932278724d51e7f8bd1f2574c7b45f85f0Benjamin Kramer ERE.r_offset = Layout.getFragmentOffset(Fragment) + Fixup.getOffset(); 885e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer 8863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (HasRelocationAddend) 8873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ERE.r_addend = Addend; 888172d7d6a12b313dd5a8c1588b8f6bd49b1ce16b6Benjamin Kramer else 889172d7d6a12b313dd5a8c1588b8f6bd49b1ce16b6Benjamin Kramer ERE.r_addend = 0; // Silence compiler warning. 8903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Relocations[Fragment->getParent()].push_back(ERE); 8923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 8933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8940b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin Krameruint64_t 8950b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin KramerELFObjectWriterImpl::getSymbolIndexInSymbolTable(const MCAssembler &Asm, 8960b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin Kramer const MCSymbol *S) { 8977b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer MCSymbolData &SD = Asm.getSymbolData(*S); 8987b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer 8997b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer // Local symbol. 9007b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer if (!SD.isExternal() && !S->isUndefined()) 9017b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer return SD.getIndex() + /* empty symbol */ 1; 9027b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer 9037b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer // External or undefined symbol. 9048f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola return SD.getIndex() + NumRegularSections + /* empty symbol */ 1; 9053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 9063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 907737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindolastatic bool isInSymtab(const MCAssembler &Asm, const MCSymbolData &Data, 90888182132470527e27231f09b25a885893e528c66Rafael Espindola bool Used, bool Renamed) { 909484291c27319668ad99cb87def000254357736fbRafael Espindola if (Data.getFlags() & ELF_Other_Weakref) 910484291c27319668ad99cb87def000254357736fbRafael Espindola return false; 911484291c27319668ad99cb87def000254357736fbRafael Espindola 912bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola if (Used) 913bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola return true; 914bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola 91588182132470527e27231f09b25a885893e528c66Rafael Espindola if (Renamed) 91688182132470527e27231f09b25a885893e528c66Rafael Espindola return false; 91788182132470527e27231f09b25a885893e528c66Rafael Espindola 918737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola const MCSymbol &Symbol = Data.getSymbol(); 919a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola 920d179886f0595eb3564a9edfdfff79def130d89ccRafael Espindola if (Symbol.getName() == "_GLOBAL_OFFSET_TABLE_") 921d179886f0595eb3564a9edfdfff79def130d89ccRafael Espindola return true; 922d179886f0595eb3564a9edfdfff79def130d89ccRafael Espindola 923a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola const MCSymbol &A = AliasedSymbol(Symbol); 924d179886f0595eb3564a9edfdfff79def130d89ccRafael Espindola if (!A.isVariable() && A.isUndefined() && !Data.isCommon()) 925a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola return false; 926a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola 927737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola if (!Asm.isSymbolLinkerVisible(Symbol) && !Symbol.isUndefined()) 928737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return false; 929737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 930bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola if (Symbol.isTemporary()) 931737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return false; 932737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 933737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return true; 934737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola} 935737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 936737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindolastatic bool isLocal(const MCSymbolData &Data) { 937737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola if (Data.isExternal()) 938737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return false; 939737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 940737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola const MCSymbol &Symbol = Data.getSymbol(); 941737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola if (Symbol.isUndefined() && !Symbol.isVariable()) 942737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return false; 943737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 944737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return true; 945737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola} 946737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 9473565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::ComputeSymbolTable(MCAssembler &Asm) { 9485c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola // FIXME: Is this the correct place to do this? 9495c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola if (NeedsGOT) { 9505c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola llvm::StringRef Name = "_GLOBAL_OFFSET_TABLE_"; 9515c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola MCSymbol *Sym = Asm.getContext().GetOrCreateSymbol(Name); 9525c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola MCSymbolData &Data = Asm.getOrCreateSymbolData(*Sym); 9535c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola Data.setExternal(true); 954f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola SetBinding(Data, ELF::STB_GLOBAL); 9555c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola } 9565c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola 9573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Build section lookup table. 9588f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola NumRegularSections = Asm.size(); 959f5c347dfc25e133e357c7086ad1b24edad4d2bc8Rafael Espindola DenseMap<const MCSection*, uint32_t> SectionIndexMap; 9603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned Index = 1; 9613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::iterator it = Asm.begin(), 9623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it, ++Index) 9633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionIndexMap[&it->getSection()] = Index; 9643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Index 0 is always the empty string. 9663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StringMap<uint64_t> StringIndexMap; 9673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StringTable += '\x00'; 9683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 969a0949b50dcea35c08b50542091f97275f401529dRafael Espindola // Add the data for the symbols. 9703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::symbol_iterator it = Asm.symbol_begin(), 9713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.symbol_end(); it != ie; ++it) { 9723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSymbol &Symbol = it->getSymbol(); 9733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 974484291c27319668ad99cb87def000254357736fbRafael Espindola bool Used = UsedInReloc.count(&Symbol); 975484291c27319668ad99cb87def000254357736fbRafael Espindola bool WeakrefUsed = WeakrefUsedInReloc.count(&Symbol); 976484291c27319668ad99cb87def000254357736fbRafael Espindola if (!isInSymtab(Asm, *it, Used || WeakrefUsed, 97788182132470527e27231f09b25a885893e528c66Rafael Espindola Renames.count(&Symbol))) 9783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming continue; 9793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData MSD; 9813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MSD.SymbolData = it; 982a0949b50dcea35c08b50542091f97275f401529dRafael Espindola bool Local = isLocal(*it); 98388182132470527e27231f09b25a885893e528c66Rafael Espindola const MCSymbol &RefSymbol = AliasedSymbol(Symbol); 9843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 985484291c27319668ad99cb87def000254357736fbRafael Espindola if (RefSymbol.isUndefined() && !Used && WeakrefUsed) 986484291c27319668ad99cb87def000254357736fbRafael Espindola SetBinding(*it, ELF::STB_WEAK); 987484291c27319668ad99cb87def000254357736fbRafael Espindola 988f7c10a3cff61c70efe8e405d9bdc5386e8e3fc0aRafael Espindola if (it->isCommon()) { 989a0949b50dcea35c08b50542091f97275f401529dRafael Espindola assert(!Local); 990f7c10a3cff61c70efe8e405d9bdc5386e8e3fc0aRafael Espindola MSD.SectionIndex = ELF::SHN_COMMON; 991bf052ac5d1c8f21075bc675f629709c20791c5f7Rafael Espindola } else if (Symbol.isAbsolute() || RefSymbol.isVariable()) { 992a0949b50dcea35c08b50542091f97275f401529dRafael Espindola MSD.SectionIndex = ELF::SHN_ABS; 99388182132470527e27231f09b25a885893e528c66Rafael Espindola } else if (RefSymbol.isUndefined()) { 9943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MSD.SectionIndex = ELF::SHN_UNDEF; 9953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 996bf052ac5d1c8f21075bc675f629709c20791c5f7Rafael Espindola MSD.SectionIndex = SectionIndexMap.lookup(&RefSymbol.getSection()); 9977be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola if (MSD.SectionIndex >= ELF::SHN_LORESERVE) 9987be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola NeedsSymtabShndx = true; 9993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(MSD.SectionIndex && "Invalid section index!"); 10005df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola } 10015df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola 100288182132470527e27231f09b25a885893e528c66Rafael Espindola // The @@@ in symbol version is replaced with @ in undefined symbols and 100388182132470527e27231f09b25a885893e528c66Rafael Espindola // @@ in defined ones. 100488182132470527e27231f09b25a885893e528c66Rafael Espindola StringRef Name = Symbol.getName(); 100588182132470527e27231f09b25a885893e528c66Rafael Espindola size_t Pos = Name.find("@@@"); 100688182132470527e27231f09b25a885893e528c66Rafael Espindola std::string FinalName; 100788182132470527e27231f09b25a885893e528c66Rafael Espindola if (Pos != StringRef::npos) { 100807ee63283cc2b9a4d6c98ecd30d1b721fe3cb29aBenjamin Kramer StringRef Prefix = Name.substr(0, Pos); 100988182132470527e27231f09b25a885893e528c66Rafael Espindola unsigned n = MSD.SectionIndex == ELF::SHN_UNDEF ? 2 : 1; 101007ee63283cc2b9a4d6c98ecd30d1b721fe3cb29aBenjamin Kramer StringRef Suffix = Name.substr(Pos + n); 101188182132470527e27231f09b25a885893e528c66Rafael Espindola FinalName = Prefix.str() + Suffix.str(); 101288182132470527e27231f09b25a885893e528c66Rafael Espindola } else { 101388182132470527e27231f09b25a885893e528c66Rafael Espindola FinalName = Name.str(); 101488182132470527e27231f09b25a885893e528c66Rafael Espindola } 101588182132470527e27231f09b25a885893e528c66Rafael Espindola 101688182132470527e27231f09b25a885893e528c66Rafael Espindola uint64_t &Entry = StringIndexMap[FinalName]; 1017a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola if (!Entry) { 1018a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola Entry = StringTable.size(); 101988182132470527e27231f09b25a885893e528c66Rafael Espindola StringTable += FinalName; 1020a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola StringTable += '\x00'; 10213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1022a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola MSD.StringIndex = Entry; 1023a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola if (MSD.SectionIndex == ELF::SHN_UNDEF) 1024a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola UndefinedSymbolData.push_back(MSD); 1025a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola else if (Local) 1026a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola LocalSymbolData.push_back(MSD); 1027a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola else 1028a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola ExternalSymbolData.push_back(MSD); 10293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 10303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Symbols are required to be in lexicographic order. 10323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(LocalSymbolData.begin(), LocalSymbolData.end()); 10333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(ExternalSymbolData.begin(), ExternalSymbolData.end()); 10343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(UndefinedSymbolData.begin(), UndefinedSymbolData.end()); 10353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Set the symbol indices. Local symbols must come before all other 10373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // symbols with non-local bindings. 10383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Index = 0; 10393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = LocalSymbolData.size(); i != e; ++i) 10403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LocalSymbolData[i].SymbolData->setIndex(Index++); 10413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = ExternalSymbolData.size(); i != e; ++i) 10423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ExternalSymbolData[i].SymbolData->setIndex(Index++); 10433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i) 10443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming UndefinedSymbolData[i].SymbolData->setIndex(Index++); 10453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 10463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10473565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout, 10483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData &SD) { 10493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (!Relocations[&SD].empty()) { 10503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCContext &Ctx = Asm.getContext(); 10514283f4b81e8c1cbf5c7a7b51e949e109ae25ff8cRafael Espindola const MCSectionELF *RelaSection; 10523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionELF &Section = 10533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming static_cast<const MCSectionELF&>(SD.getSection()); 10543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const StringRef SectionName = Section.getSectionName(); 1056377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer std::string RelaSectionName = HasRelocationAddend ? ".rela" : ".rel"; 10573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming RelaSectionName += SectionName; 1058299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer 1059299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer unsigned EntrySize; 1060299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer if (HasRelocationAddend) 1061299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer EntrySize = Is64Bit ? sizeof(ELF::Elf64_Rela) : sizeof(ELF::Elf32_Rela); 1062299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer else 1063299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer EntrySize = Is64Bit ? sizeof(ELF::Elf64_Rel) : sizeof(ELF::Elf32_Rel); 10643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1065377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer RelaSection = Ctx.getELFSection(RelaSectionName, HasRelocationAddend ? 1066377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer ELF::SHT_RELA : ELF::SHT_REL, 0, 10673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionKind::getReadOnly(), 106834be396a12b00a95a1353c356d64868798ea3098Rafael Espindola EntrySize); 10693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSectionData &RelaSD = Asm.getOrCreateSectionData(*RelaSection); 1071a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer RelaSD.setAlignment(Is64Bit ? 8 : 4); 10723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCDataFragment *F = new MCDataFragment(&RelaSD); 10743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteRelocationsFragment(Asm, F, &SD); 10763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10777070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola Asm.AddSectionToTheEnd(*Writer, RelaSD, Layout); 10783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 10793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 10803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10813565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteSecHdrEntry(uint32_t Name, uint32_t Type, 10823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Flags, uint64_t Address, 10833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Offset, uint64_t Size, 10843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint32_t Link, uint32_t Info, 10853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Alignment, 10863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t EntrySize) { 10873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Name); // sh_name: index into string table 10883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Type); // sh_type 10893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Flags); // sh_flags 10903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Address); // sh_addr 10913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Offset); // sh_offset 10923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Size); // sh_size 10933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Link); // sh_link 10943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Info); // sh_info 10953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Alignment); // sh_addralign 10963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(EntrySize); // sh_entsize 10973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 10983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10993565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteRelocationsFragment(const MCAssembler &Asm, 11003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCDataFragment *F, 11013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData *SD) { 11023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFRelocationEntry> &Relocs = Relocations[SD]; 11033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // sort by the r_offset just like gnu as does 11043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(Relocs.begin(), Relocs.end()); 11053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = Relocs.size(); i != e; ++i) { 11073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFRelocationEntry entry = Relocs[e - i - 1]; 11083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11098f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola if (entry.Index < 0) 11108f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola entry.Index = getSymbolIndexInSymbolTable(Asm, entry.Symbol); 11118f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola else 11128f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola entry.Index += LocalSymbolData.size() + 1; 11135e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer if (Is64Bit) { 11145e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer char buf[8]; 11153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11165e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer String64(buf, entry.r_offset); 11175e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer F->getContents() += StringRef(buf, 8); 11185e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer 11198f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola struct ELF::Elf64_Rela ERE64; 11208f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ERE64.setSymbolAndType(entry.Index, entry.Type); 11218f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola String64(buf, ERE64.r_info); 11225e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer F->getContents() += StringRef(buf, 8); 11235e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer 11245e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer if (HasRelocationAddend) { 11255e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer String64(buf, entry.r_addend); 11265e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer F->getContents() += StringRef(buf, 8); 11275e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer } 11285e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer } else { 11295e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer char buf[4]; 11305e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer 11315e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer String32(buf, entry.r_offset); 11325e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer F->getContents() += StringRef(buf, 4); 11335e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer 11348f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola struct ELF::Elf32_Rela ERE32; 11358f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ERE32.setSymbolAndType(entry.Index, entry.Type); 11368f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola String32(buf, ERE32.r_info); 11375e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer F->getContents() += StringRef(buf, 4); 11385e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer 11395e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer if (HasRelocationAddend) { 11405e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer String32(buf, entry.r_addend); 11415e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer F->getContents() += StringRef(buf, 4); 11425e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer } 11435e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer } 11443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 11453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 11463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11473565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::CreateMetadataSections(MCAssembler &Asm, 11483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCAsmLayout &Layout) { 11493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCContext &Ctx = Asm.getContext(); 11503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCDataFragment *F; 11513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned EntrySize = Is64Bit ? ELF::SYMENTRY_SIZE64 : ELF::SYMENTRY_SIZE32; 11533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 115471859c640f6a36251aca223fd503c58dc314e296Rafael Espindola unsigned NumRegularSections = Asm.size(); 115571859c640f6a36251aca223fd503c58dc314e296Rafael Espindola 115638738bf1a847292003a5495f17e42a75d1274bf7Rafael Espindola // We construct .shstrtab, .symtab and .strtab in this order to match gnu as. 11574283f4b81e8c1cbf5c7a7b51e949e109ae25ff8cRafael Espindola const MCSectionELF *ShstrtabSection = 11587be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Ctx.getELFSection(".shstrtab", ELF::SHT_STRTAB, 0, 11597be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SectionKind::getReadOnly(), false); 116071859c640f6a36251aca223fd503c58dc314e296Rafael Espindola MCSectionData &ShstrtabSD = Asm.getOrCreateSectionData(*ShstrtabSection); 116171859c640f6a36251aca223fd503c58dc314e296Rafael Espindola ShstrtabSD.setAlignment(1); 116271859c640f6a36251aca223fd503c58dc314e296Rafael Espindola ShstrtabIndex = Asm.size(); 116371859c640f6a36251aca223fd503c58dc314e296Rafael Espindola 11644283f4b81e8c1cbf5c7a7b51e949e109ae25ff8cRafael Espindola const MCSectionELF *SymtabSection = 11657be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Ctx.getELFSection(".symtab", ELF::SHT_SYMTAB, 0, 11667be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SectionKind::getReadOnly(), 116734be396a12b00a95a1353c356d64868798ea3098Rafael Espindola EntrySize); 11683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSectionData &SymtabSD = Asm.getOrCreateSectionData(*SymtabSection); 11693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SymtabSD.setAlignment(Is64Bit ? 8 : 4); 11707be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SymbolTableIndex = Asm.size(); 11717be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola 11727be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola MCSectionData *SymtabShndxSD = NULL; 11737be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola 11747be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola if (NeedsSymtabShndx) { 11754283f4b81e8c1cbf5c7a7b51e949e109ae25ff8cRafael Espindola const MCSectionELF *SymtabShndxSection = 11767be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Ctx.getELFSection(".symtab_shndx", ELF::SHT_SYMTAB_SHNDX, 0, 117734be396a12b00a95a1353c356d64868798ea3098Rafael Espindola SectionKind::getReadOnly(), 4); 11787be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SymtabShndxSD = &Asm.getOrCreateSectionData(*SymtabShndxSection); 11797be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SymtabShndxSD->setAlignment(4); 11807be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola } 11813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSection *StrtabSection; 11833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StrtabSection = Ctx.getELFSection(".strtab", ELF::SHT_STRTAB, 0, 11843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionKind::getReadOnly(), false); 11853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSectionData &StrtabSD = Asm.getOrCreateSectionData(*StrtabSection); 11863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StrtabSD.setAlignment(1); 11873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StringTableIndex = Asm.size(); 11883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1189c3c413f63117896f186fc4385bdaac0578d3613fRafael Espindola WriteRelocations(Asm, Layout); 119071859c640f6a36251aca223fd503c58dc314e296Rafael Espindola 119171859c640f6a36251aca223fd503c58dc314e296Rafael Espindola // Symbol table 119271859c640f6a36251aca223fd503c58dc314e296Rafael Espindola F = new MCDataFragment(&SymtabSD); 11937be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola MCDataFragment *ShndxF = NULL; 11947be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola if (NeedsSymtabShndx) { 11957be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola ShndxF = new MCDataFragment(SymtabShndxSD); 11967be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Asm.AddSectionToTheEnd(*Writer, *SymtabShndxSD, Layout); 11977be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola } 11987be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola WriteSymbolTable(F, ShndxF, Asm, Layout, NumRegularSections); 11997070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola Asm.AddSectionToTheEnd(*Writer, SymtabSD, Layout); 120071859c640f6a36251aca223fd503c58dc314e296Rafael Espindola 12013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F = new MCDataFragment(&StrtabSD); 12023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents().append(StringTable.begin(), StringTable.end()); 12037070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola Asm.AddSectionToTheEnd(*Writer, StrtabSD, Layout); 12043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F = new MCDataFragment(&ShstrtabSD); 12063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Section header string table. 12083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 12093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // The first entry of a string table holds a null character so skip 12103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // section 0. 12113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Index = 1; 12123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += '\x00'; 12133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 12153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 12163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionELF &Section = 1217368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer static_cast<const MCSectionELF&>(it->getSection()); 121851efe7a253190b672519e8388ce5d45f1dcf1a24Rafael Espindola // FIXME: We could merge suffixes like in .text and .rela.text. 12193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Remember the index into the string table so we can write it 12213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // into the sh_name field of the section header table. 12223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionStringTableIndex[&it->getSection()] = Index; 12233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Index += Section.getSectionName().size() + 1; 12253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += Section.getSectionName(); 12263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += '\x00'; 12273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 12283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12297070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola Asm.AddSectionToTheEnd(*Writer, ShstrtabSD, Layout); 12307070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola} 12317070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 12327070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindolabool ELFObjectWriterImpl::IsFixupFullyResolved(const MCAssembler &Asm, 12337070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCValue Target, 12347070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola bool IsPCRel, 12357070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCFragment *DF) const { 12367070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola // If this is a PCrel relocation, find the section this fixup value is 12377070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola // relative to. 12387070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSection *BaseSection = 0; 12397070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (IsPCRel) { 12407070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola BaseSection = &DF->getParent()->getSection(); 12417070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola assert(BaseSection); 12427070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola } 12437070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 12447070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSection *SectionA = 0; 12457070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSymbol *SymbolA = 0; 12467070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (const MCSymbolRefExpr *A = Target.getSymA()) { 12477070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola SymbolA = &A->getSymbol(); 12487070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola SectionA = &SymbolA->getSection(); 12497070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola } 12507070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 12517070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSection *SectionB = 0; 12527070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (const MCSymbolRefExpr *B = Target.getSymB()) { 12537070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola SectionB = &B->getSymbol().getSection(); 12547070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola } 12557070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 12567070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (!BaseSection) 12577070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola return SectionA == SectionB; 12587070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 12597070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSymbolData &DataA = Asm.getSymbolData(*SymbolA); 12607070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (DataA.isExternal()) 12617070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola return false; 12627070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 12637070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola return !SectionB && BaseSection == SectionA; 12643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 12653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12668f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindolavoid ELFObjectWriterImpl::WriteObject(MCAssembler &Asm, 12673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout) { 12688f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola // Compute symbol table information. 12698f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ComputeSymbolTable(Asm); 12708f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola 12713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming CreateMetadataSections(const_cast<MCAssembler&>(Asm), 12723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const_cast<MCAsmLayout&>(Layout)); 12733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Add 1 for the null section. 12753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned NumSections = Asm.size() + 1; 1276a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t NaturalAlignment = Is64Bit ? 8 : 4; 1277a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t HeaderSize = Is64Bit ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr); 1278a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t FileOff = HeaderSize; 12793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 12813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 12823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData &SD = *it; 12833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1284a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff = RoundUpToAlignment(FileOff, SD.getAlignment()); 1285a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 12863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Get the size of the section in the output file (including padding). 12873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Size = Layout.getSectionFileSize(&SD); 1288a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 1289a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff += Size; 12903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 12913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1292a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff = RoundUpToAlignment(FileOff, NaturalAlignment); 1293a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 12943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Write out the ELF header ... 1295a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer WriteHeader(FileOff - HeaderSize, NumSections); 1296a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 1297a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff = HeaderSize; 12983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ... then all of the sections ... 13003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming DenseMap<const MCSection*, uint64_t> SectionOffsetMap; 13013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1302d8e0bfe07a7d101eeed7204d1dfcaae17ad51908Rafael Espindola DenseMap<const MCSection*, uint32_t> SectionIndexMap; 130344cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer 130444cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer unsigned Index = 1; 13053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 13063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 1307a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer const MCSectionData &SD = *it; 1308a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 1309a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t Padding = OffsetToAlignment(FileOff, SD.getAlignment()); 1310a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer WriteZeros(Padding); 1311a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff += Padding; 1312a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 13133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Remember the offset into the file for this section. 13143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionOffsetMap[&it->getSection()] = FileOff; 131544cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer SectionIndexMap[&it->getSection()] = Index++; 131644cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer 13173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming FileOff += Layout.getSectionFileSize(&SD); 13183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Asm.WriteSectionData(it, Layout, Writer); 13203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 13213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1322a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t Padding = OffsetToAlignment(FileOff, NaturalAlignment); 1323a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer WriteZeros(Padding); 1324a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff += Padding; 1325a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 13263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ... and then the section header table. 13273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Should we align the section header table? 13283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 13293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Null section first. 13307be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola uint64_t FirstSectionSize = 13317be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola NumSections >= ELF::SHN_LORESERVE ? NumSections : 0; 13327be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola uint32_t FirstSectionLink = 13337be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola ShstrtabIndex >= ELF::SHN_LORESERVE ? ShstrtabIndex : 0; 13347be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola WriteSecHdrEntry(0, 0, 0, 0, 0, FirstSectionSize, FirstSectionLink, 0, 0, 0); 13353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 13373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 13383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData &SD = *it; 13393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionELF &Section = 13403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming static_cast<const MCSectionELF&>(SD.getSection()); 13413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t sh_link = 0; 13433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t sh_info = 0; 13443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming switch(Section.getType()) { 13463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_DYNAMIC: 13473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_link = SectionStringTableIndex[&it->getSection()]; 13483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_info = 0; 13493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 13503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_REL: 1352f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman case ELF::SHT_RELA: { 13534283f4b81e8c1cbf5c7a7b51e949e109ae25ff8cRafael Espindola const MCSectionELF *SymtabSection; 13544283f4b81e8c1cbf5c7a7b51e949e109ae25ff8cRafael Espindola const MCSectionELF *InfoSection; 13553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SymtabSection = Asm.getContext().getELFSection(".symtab", ELF::SHT_SYMTAB, 0, 13573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionKind::getReadOnly(), 1358f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman false); 135944cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer sh_link = SectionIndexMap[SymtabSection]; 13603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1361377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer // Remove ".rel" and ".rela" prefixes. 1362377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer unsigned SecNameLen = (Section.getType() == ELF::SHT_REL) ? 4 : 5; 1363377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer StringRef SectionName = Section.getSectionName().substr(SecNameLen); 1364377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer 1365f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman InfoSection = Asm.getContext().getELFSection(SectionName, 13663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELF::SHT_PROGBITS, 0, 1367f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman SectionKind::getReadOnly(), 1368f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman false); 136944cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer sh_info = SectionIndexMap[InfoSection]; 13703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 1371f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman } 13723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_SYMTAB: 13743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_DYNSYM: 13753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_link = StringTableIndex; 13763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_info = LastLocalSymbolIndex; 13773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 13783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13797be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola case ELF::SHT_SYMTAB_SHNDX: 13807be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola sh_link = SymbolTableIndex; 13817be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola break; 13827be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola 13833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_PROGBITS: 13843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_STRTAB: 13853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_NOBITS: 138619dc7faf25e3a8cc37a656b74ebeef3ab976aa8eBenjamin Kramer case ELF::SHT_NULL: 1387cecbc3d28277ff4916326311cbf87335ed05d106Rafael Espindola case ELF::SHT_ARM_ATTRIBUTES: 13883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Nothing to do. 13893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 13903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming default: 13923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(0 && "FIXME: sh_type value not supported!"); 13933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 13943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 13953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSecHdrEntry(SectionStringTableIndex[&it->getSection()], 13973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Section.getType(), Section.getFlags(), 139871859c640f6a36251aca223fd503c58dc314e296Rafael Espindola 0, 13993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionOffsetMap.lookup(&SD.getSection()), 14003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Layout.getSectionSize(&SD), sh_link, 14013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_info, SD.getAlignment(), 14023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Section.getEntrySize()); 14033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 14043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 14053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 14063565a06ebf44a193a8b333cbeff2ee154298d450Matt FlemingELFObjectWriter::ELFObjectWriter(raw_ostream &OS, 14073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool Is64Bit, 14085baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky Triple::OSType OSType, 1409eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck uint16_t EMachine, 14103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool IsLittleEndian, 14113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool HasRelocationAddend) 14123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming : MCObjectWriter(OS, IsLittleEndian) 14133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming{ 1414eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck Impl = new ELFObjectWriterImpl(this, Is64Bit, EMachine, 1415eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck HasRelocationAddend, OSType); 14163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 14173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 14183565a06ebf44a193a8b333cbeff2ee154298d450Matt FlemingELFObjectWriter::~ELFObjectWriter() { 14193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming delete (ELFObjectWriterImpl*) Impl; 14203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 14213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 14223565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm) { 14233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ((ELFObjectWriterImpl*) Impl)->ExecutePostLayoutBinding(Asm); 14243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 14253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 14263565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriter::RecordRelocation(const MCAssembler &Asm, 14273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout, 14283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFragment *Fragment, 14293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFixup &Fixup, MCValue Target, 14303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t &FixedValue) { 14313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ((ELFObjectWriterImpl*) Impl)->RecordRelocation(Asm, Layout, Fragment, Fixup, 14323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Target, FixedValue); 14333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 14343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 14357070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindolabool ELFObjectWriter::IsFixupFullyResolved(const MCAssembler &Asm, 14367070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCValue Target, 14377070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola bool IsPCRel, 14387070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCFragment *DF) const { 14397070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola return ((ELFObjectWriterImpl*) Impl)->IsFixupFullyResolved(Asm, Target, 14407070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola IsPCRel, DF); 14417070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola} 14427070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 14438f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindolavoid ELFObjectWriter::WriteObject(MCAssembler &Asm, 14443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout) { 14453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ((ELFObjectWriterImpl*) Impl)->WriteObject(Asm, Layout); 14463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 1447