ELFObjectWriter.cpp revision 1f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313
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 148f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola#include "llvm/ADT/SmallPtrSet.h" 153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/ADT/STLExtras.h" 163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/ADT/StringMap.h" 173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/ADT/Twine.h" 183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCAssembler.h" 193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCAsmLayout.h" 203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCContext.h" 213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCELFSymbolFlags.h" 223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCExpr.h" 233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCObjectWriter.h" 243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCSectionELF.h" 253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCSymbol.h" 263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCValue.h" 273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/Support/Debug.h" 283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/Support/ErrorHandling.h" 293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/Support/ELF.h" 303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/Target/TargetAsmBackend.h" 313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "../Target/X86/X86FixupKinds.h" 333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include <vector> 353565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingusing namespace llvm; 363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 37ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindolastatic unsigned GetType(const MCSymbolData &SD) { 38ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola uint32_t Type = (SD.getFlags() & (0xf << ELF_STT_Shift)) >> ELF_STT_Shift; 39ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola assert(Type == ELF::STT_NOTYPE || Type == ELF::STT_OBJECT || 40ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola Type == ELF::STT_FUNC || Type == ELF::STT_SECTION || 41ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola Type == ELF::STT_FILE || Type == ELF::STT_COMMON || 42ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola Type == ELF::STT_TLS); 43ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola return Type; 44ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola} 45ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola 46e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindolastatic unsigned GetBinding(const MCSymbolData &SD) { 47e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola uint32_t Binding = (SD.getFlags() & (0xf << ELF_STB_Shift)) >> ELF_STB_Shift; 48e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola assert(Binding == ELF::STB_LOCAL || Binding == ELF::STB_GLOBAL || 49e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola Binding == ELF::STB_WEAK); 50e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola return Binding; 51e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola} 52e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola 53e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindolastatic void SetBinding(MCSymbolData &SD, unsigned Binding) { 54e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola assert(Binding == ELF::STB_LOCAL || Binding == ELF::STB_GLOBAL || 55e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola Binding == ELF::STB_WEAK); 56e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola uint32_t OtherFlags = SD.getFlags() & ~(0xf << ELF_STB_Shift); 57e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola SD.setFlags(OtherFlags | (Binding << ELF_STB_Shift)); 58e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola} 59e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola 60152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindolastatic unsigned GetVisibility(MCSymbolData &SD) { 61152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola unsigned Visibility = 62152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola (SD.getFlags() & (0xf << ELF_STV_Shift)) >> ELF_STV_Shift; 63152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola assert(Visibility == ELF::STV_DEFAULT || Visibility == ELF::STV_INTERNAL || 64152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola Visibility == ELF::STV_HIDDEN || Visibility == ELF::STV_PROTECTED); 65152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola return Visibility; 66152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola} 67152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola 68cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindolastatic bool isFixupKindX86PCRel(unsigned Kind) { 69cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola switch (Kind) { 70cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola default: 71cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola return false; 72cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola case X86::reloc_pcrel_1byte: 73cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola case X86::reloc_pcrel_4byte: 74cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola case X86::reloc_riprel_4byte: 75cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola case X86::reloc_riprel_4byte_movq_load: 76cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola return true; 77cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola } 78cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola} 79cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola 80a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindolastatic bool RelocNeedsGOT(MCSymbolRefExpr::VariantKind Variant) { 81a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola switch (Variant) { 825c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola default: 835c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola return false; 84a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_GOT: 85a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_PLT: 86a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_GOTPCREL: 87a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_TPOFF: 88a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_TLSGD: 89a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_GOTTPOFF: 90a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_INDNTPOFF: 91a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_NTPOFF: 92a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_GOTNTPOFF: 93a264f72d3fb9dec1427480fcf17ef3c746ea723aRafael Espindola case MCSymbolRefExpr::VK_TLSLDM: 940cf15d61b7e3bf53f5a99f58ada37b93bc039559Rafael Espindola case MCSymbolRefExpr::VK_DTPOFF: 95b4d1721eff7b43577e5f2e53f885973fb6c43683Rafael Espindola case MCSymbolRefExpr::VK_TLSLD: 965c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola return true; 975c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola } 985c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola} 995c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola 1003565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingnamespace { 101115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar class ELFObjectWriter : public MCObjectWriter { 102b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner /*static bool isFixupKindX86RIPRel(unsigned Kind) { 1033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming return Kind == X86::reloc_riprel_4byte || 1043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Kind == X86::reloc_riprel_4byte_movq_load; 105b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner }*/ 1063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// ELFSymbolData - Helper struct for containing some precomputed information 1093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// on symbols. 1103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming struct ELFSymbolData { 1113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData *SymbolData; 1123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t StringIndex; 1133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint32_t SectionIndex; 1143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Support lexicographic sorting. 1163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool operator<(const ELFSymbolData &RHS) const { 117ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola if (GetType(*SymbolData) == ELF::STT_FILE) 118ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola return true; 119ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola if (GetType(*RHS.SymbolData) == ELF::STT_FILE) 120ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola return false; 12136c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer return SymbolData->getSymbol().getName() < 12236c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer RHS.SymbolData->getSymbol().getName(); 1233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming }; 1253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @name Relocation Data 1273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @{ 1283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming struct ELFRelocationEntry { 1303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Make these big enough for both 32-bit and 64-bit 1313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t r_offset; 1328f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola int Index; 1338f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola unsigned Type; 1348f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola const MCSymbol *Symbol; 1353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t r_addend; 1363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Support lexicographic sorting. 1383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool operator<(const ELFRelocationEntry &RE) const { 1393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming return RE.r_offset < r_offset; 1403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming }; 1423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1438f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola SmallPtrSet<const MCSymbol *, 16> UsedInReloc; 144484291c27319668ad99cb87def000254357736fbRafael Espindola SmallPtrSet<const MCSymbol *, 16> WeakrefUsedInReloc; 14588182132470527e27231f09b25a885893e528c66Rafael Espindola DenseMap<const MCSymbol *, const MCSymbol *> Renames; 1468f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola 1473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming llvm::DenseMap<const MCSectionData*, 1483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFRelocationEntry> > Relocations; 1493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming DenseMap<const MCSection*, uint64_t> SectionStringTableIndex; 1503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @} 1523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @name Symbol Table Data 1533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @{ 1543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SmallString<256> StringTable; 1563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFSymbolData> LocalSymbolData; 1573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFSymbolData> ExternalSymbolData; 1583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFSymbolData> UndefinedSymbolData; 1593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @} 1613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1625c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola bool NeedsGOT; 1635c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola 1647be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola bool NeedsSymtabShndx; 1657be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola 1663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned Is64Bit : 1; 1673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool HasRelocationAddend; 1693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1705baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky Triple::OSType OSType; 1715baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky 172eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck uint16_t EMachine; 173eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck 1743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // This holds the symbol table index of the last local symbol. 1753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned LastLocalSymbolIndex; 1763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // This holds the .strtab section index. 1773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned StringTableIndex; 1787be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola // This holds the .symtab section index. 1797be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola unsigned SymbolTableIndex; 1803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned ShstrtabIndex; 1823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1831f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola 1841f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola const MCSymbol *SymbolToReloc(const MCAssembler &Asm, 1851f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola const MCValue &Target, 1861f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola const MCFragment &F) const; 1871f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola 1883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming public: 189115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar ELFObjectWriter(raw_ostream &_OS, bool _Is64Bit, bool IsLittleEndian, 190115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar uint16_t _EMachine, bool _HasRelAddend, 191115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar Triple::OSType _OSType) 192115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar : MCObjectWriter(_OS, IsLittleEndian), 193115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar NeedsGOT(false), NeedsSymtabShndx(false), 1945baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky Is64Bit(_Is64Bit), HasRelocationAddend(_HasRelAddend), 195eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck OSType(_OSType), EMachine(_EMachine) { 1963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 197115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar 1983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteWord(uint64_t W) { 199b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner if (Is64Bit) 200115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar Write64(W); 201b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner else 202115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar Write32(W); 2033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringLE16(char *buf, uint16_t Value) { 2063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[0] = char(Value >> 0); 2073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[1] = char(Value >> 8); 2083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringLE32(char *buf, uint32_t Value) { 21136c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer StringLE16(buf, uint16_t(Value >> 0)); 212c522f6e70b02d161e4bf37023edb20643ee34acfBenjamin Kramer StringLE16(buf + 2, uint16_t(Value >> 16)); 2133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringLE64(char *buf, uint64_t Value) { 21636c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer StringLE32(buf, uint32_t(Value >> 0)); 217c522f6e70b02d161e4bf37023edb20643ee34acfBenjamin Kramer StringLE32(buf + 4, uint32_t(Value >> 32)); 2183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringBE16(char *buf ,uint16_t Value) { 2213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[0] = char(Value >> 8); 2223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[1] = char(Value >> 0); 2233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringBE32(char *buf, uint32_t Value) { 22636c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer StringBE16(buf, uint16_t(Value >> 16)); 227c522f6e70b02d161e4bf37023edb20643ee34acfBenjamin Kramer StringBE16(buf + 2, uint16_t(Value >> 0)); 2283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringBE64(char *buf, uint64_t Value) { 23136c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer StringBE32(buf, uint32_t(Value >> 32)); 232c522f6e70b02d161e4bf37023edb20643ee34acfBenjamin Kramer StringBE32(buf + 4, uint32_t(Value >> 0)); 2333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 235af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola void String8(MCDataFragment &F, uint8_t Value) { 236af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola char buf[1]; 237af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola buf[0] = Value; 238af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola F.getContents() += StringRef(buf, 1); 239af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola } 240af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola 241af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola void String16(MCDataFragment &F, uint16_t Value) { 242af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola char buf[2]; 243115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar if (isLittleEndian()) 244f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringLE16(buf, Value); 2453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming else 246f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringBE16(buf, Value); 247af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola F.getContents() += StringRef(buf, 2); 2483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 250af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola void String32(MCDataFragment &F, uint32_t Value) { 251af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola char buf[4]; 252115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar if (isLittleEndian()) 253f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringLE32(buf, Value); 2543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming else 255f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringBE32(buf, Value); 256af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola F.getContents() += StringRef(buf, 4); 2573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 259af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola void String64(MCDataFragment &F, uint64_t Value) { 260af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola char buf[8]; 261115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar if (isLittleEndian()) 262f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringLE64(buf, Value); 2633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming else 264f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringBE64(buf, Value); 265af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola F.getContents() += StringRef(buf, 8); 2663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteHeader(uint64_t SectionDataSize, unsigned NumberOfSections); 2693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2707be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola void WriteSymbolEntry(MCDataFragment *SymtabF, MCDataFragment *ShndxF, 2717be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola uint64_t name, uint8_t info, 2723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t value, uint64_t size, 2737be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola uint8_t other, uint32_t shndx, 2747be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola bool Reserved); 2753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2767be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola void WriteSymbol(MCDataFragment *SymtabF, MCDataFragment *ShndxF, 2777be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola ELFSymbolData &MSD, 2783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout); 2793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 280bab2a80525956b03b5f9126e1496785493326c37Rafael Espindola typedef DenseMap<const MCSectionELF*, uint32_t> SectionIndexMapTy; 2817be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola void WriteSymbolTable(MCDataFragment *SymtabF, MCDataFragment *ShndxF, 2827be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola const MCAssembler &Asm, 28371859c640f6a36251aca223fd503c58dc314e296Rafael Espindola const MCAsmLayout &Layout, 2844beee3d06bfebe3f3382893fcebc71d1aa3f290eRafael Espindola const SectionIndexMapTy &SectionIndexMap); 2853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void RecordRelocation(const MCAssembler &Asm, const MCAsmLayout &Layout, 2873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFragment *Fragment, const MCFixup &Fixup, 2883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCValue Target, uint64_t &FixedValue); 2893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2900b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin Kramer uint64_t getSymbolIndexInSymbolTable(const MCAssembler &Asm, 2910b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin Kramer const MCSymbol *S); 2923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2931f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola // Map from a group section to the signature symbol 2941f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola typedef DenseMap<const MCSectionELF*, const MCSymbol*> GroupMapTy; 2951f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola // Map from a signature symbol to the group section 2961f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola typedef DenseMap<const MCSymbol*, const MCSectionELF*> RevGroupMapTy; 2971f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola 2983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// ComputeSymbolTable - Compute the symbol table data 2993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// 3003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// \param StringTable [out] - The string table data. 3013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// \param StringIndexMap [out] - Map from symbol names to offsets in the 3023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// string table. 303bab2a80525956b03b5f9126e1496785493326c37Rafael Espindola void ComputeSymbolTable(MCAssembler &Asm, 3041f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola const SectionIndexMapTy &SectionIndexMap, 3051f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola RevGroupMapTy RevGroupMap); 306bab2a80525956b03b5f9126e1496785493326c37Rafael Espindola 307bab2a80525956b03b5f9126e1496785493326c37Rafael Espindola void ComputeIndexMap(MCAssembler &Asm, 308bab2a80525956b03b5f9126e1496785493326c37Rafael Espindola SectionIndexMapTy &SectionIndexMap); 3093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout, 3113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData &SD); 3123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteRelocations(MCAssembler &Asm, MCAsmLayout &Layout) { 3143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 3153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 3163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteRelocation(Asm, Layout, *it); 3173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 3183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 3193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3204beee3d06bfebe3f3382893fcebc71d1aa3f290eRafael Espindola void CreateMetadataSections(MCAssembler &Asm, MCAsmLayout &Layout, 3214beee3d06bfebe3f3382893fcebc71d1aa3f290eRafael Espindola const SectionIndexMapTy &SectionIndexMap); 3223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3232ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola void CreateGroupSections(MCAssembler &Asm, MCAsmLayout &Layout, 3241f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola GroupMapTy &GroupMap, RevGroupMapTy &RevGroupMap); 3252ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola 32688182132470527e27231f09b25a885893e528c66Rafael Espindola void ExecutePostLayoutBinding(MCAssembler &Asm); 3273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteSecHdrEntry(uint32_t Name, uint32_t Type, uint64_t Flags, 3293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Address, uint64_t Offset, 3303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Size, uint32_t Link, uint32_t Info, 3313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Alignment, uint64_t EntrySize); 3323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteRelocationsFragment(const MCAssembler &Asm, MCDataFragment *F, 3343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData *SD); 3353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3367070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola bool IsFixupFullyResolved(const MCAssembler &Asm, 3377070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCValue Target, 3387070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola bool IsPCRel, 3397070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCFragment *DF) const; 3407070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 3418f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola void WriteObject(MCAssembler &Asm, const MCAsmLayout &Layout); 342c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola void WriteSection(MCAssembler &Asm, 343c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola const SectionIndexMapTy &SectionIndexMap, 3442ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola uint32_t GroupSymbolIndex, 345c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola uint64_t Offset, uint64_t Size, uint64_t Alignment, 346c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola const MCSectionELF &Section); 3473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming }; 3483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 3503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// Emit the ELF header. 352115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbarvoid ELFObjectWriter::WriteHeader(uint64_t SectionDataSize, 353115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar unsigned NumberOfSections) { 3543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ELF Header 3553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ---------- 3563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 3573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Note 3583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ---- 3593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // emitWord method behaves differently for ELF32 and ELF64, writing 3603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 4 bytes in the former and 8 in the latter. 3613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(0x7f); // e_ident[EI_MAG0] 3633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8('E'); // e_ident[EI_MAG1] 3643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8('L'); // e_ident[EI_MAG2] 3653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8('F'); // e_ident[EI_MAG3] 3663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(Is64Bit ? ELF::ELFCLASS64 : ELF::ELFCLASS32); // e_ident[EI_CLASS] 3683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_ident[EI_DATA] 370115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar Write8(isLittleEndian() ? ELF::ELFDATA2LSB : ELF::ELFDATA2MSB); 3713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(ELF::EV_CURRENT); // e_ident[EI_VERSION] 3735baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky // e_ident[EI_OSABI] 3745baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky switch (OSType) { 3755baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky case Triple::FreeBSD: Write8(ELF::ELFOSABI_FREEBSD); break; 3765baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky case Triple::Linux: Write8(ELF::ELFOSABI_LINUX); break; 3775baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky default: Write8(ELF::ELFOSABI_NONE); break; 3785baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky } 3793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(0); // e_ident[EI_ABIVERSION] 3803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteZeros(ELF::EI_NIDENT - ELF::EI_PAD); 3823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(ELF::ET_REL); // e_type 3843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 385eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck Write16(EMachine); // e_machine = target 3863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(ELF::EV_CURRENT); // e_version 3883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(0); // e_entry, no entry point in .o file 3893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(0); // e_phoff, no program header for .o 390eb97677764beb115c658ac559d3649c6c4068eb9Benjamin Kramer WriteWord(SectionDataSize + (Is64Bit ? sizeof(ELF::Elf64_Ehdr) : 391eb97677764beb115c658ac559d3649c6c4068eb9Benjamin Kramer sizeof(ELF::Elf32_Ehdr))); // e_shoff = sec hdr table off in bytes 3923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // FIXME: Make this configurable. 3943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(0); // e_flags = whatever the target wants 3953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_ehsize = ELF header size 3973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(Is64Bit ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr)); 3983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(0); // e_phentsize = prog header entry size 4003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(0); // e_phnum = # prog header entries = 0 4013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_shentsize = Section header entry size 4033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(Is64Bit ? sizeof(ELF::Elf64_Shdr) : sizeof(ELF::Elf32_Shdr)); 4043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_shnum = # of section header ents 4067be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola if (NumberOfSections >= ELF::SHN_LORESERVE) 4077be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Write16(0); 4087be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola else 4097be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Write16(NumberOfSections); 4103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_shstrndx = Section # of '.shstrtab' 4127be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola if (NumberOfSections >= ELF::SHN_LORESERVE) 4137be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Write16(ELF::SHN_XINDEX); 4147be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola else 4157be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Write16(ShstrtabIndex); 4163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 4173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 418115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbarvoid ELFObjectWriter::WriteSymbolEntry(MCDataFragment *SymtabF, 419115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar MCDataFragment *ShndxF, 420115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar uint64_t name, 421115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar uint8_t info, uint64_t value, 422115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar uint64_t size, uint8_t other, 423115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar uint32_t shndx, 424115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar bool Reserved) { 4257be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola if (ShndxF) { 4267be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola if (shndx >= ELF::SHN_LORESERVE && !Reserved) 427af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String32(*ShndxF, shndx); 4287be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola else 429af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String32(*ShndxF, 0); 4307be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola } 4317be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola 432af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola uint16_t Index = (shndx >= ELF::SHN_LORESERVE && !Reserved) ? 433af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola uint16_t(ELF::SHN_XINDEX) : shndx; 4343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 435af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola if (Is64Bit) { 436af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String32(*SymtabF, name); // st_name 437af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String8(*SymtabF, info); // st_info 438af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String8(*SymtabF, other); // st_other 439af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String16(*SymtabF, Index); // st_shndx 440af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String64(*SymtabF, value); // st_value 441af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String64(*SymtabF, size); // st_size 4423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 443af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String32(*SymtabF, name); // st_name 444af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String32(*SymtabF, value); // st_value 445af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String32(*SymtabF, size); // st_size 446af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String8(*SymtabF, info); // st_info 447af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String8(*SymtabF, other); // st_other 448af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String16(*SymtabF, Index); // st_shndx 4493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 4503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 4513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4522c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindolastatic uint64_t SymbolValue(MCSymbolData &Data, const MCAsmLayout &Layout) { 4532c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola if (Data.isCommon() && Data.isExternal()) 4542c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola return Data.getCommonAlignment(); 4552c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola 4562c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola const MCSymbol &Symbol = Data.getSymbol(); 4572c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola if (!Symbol.isInSection()) 4582c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola return 0; 4592c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola 4601973d4379250a88938a9358c12d96e96bdc8dedeRafael Espindola if (MCFragment *FF = Data.getFragment()) 4611973d4379250a88938a9358c12d96e96bdc8dedeRafael Espindola return Layout.getSymbolAddress(&Data) - 4621973d4379250a88938a9358c12d96e96bdc8dedeRafael Espindola Layout.getSectionAddress(FF->getParent()); 4632c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola 4642c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola return 0; 4652c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola} 4662c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola 467de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindolastatic const MCSymbol &AliasedSymbol(const MCSymbol &Symbol) { 468de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola const MCSymbol *S = &Symbol; 469de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola while (S->isVariable()) { 470de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola const MCExpr *Value = S->getVariableValue(); 4719302bd664d930e7e6b61e208b0cca06fe71e8eb3Rafael Espindola MCExpr::ExprKind Kind = Value->getKind(); 4729302bd664d930e7e6b61e208b0cca06fe71e8eb3Rafael Espindola switch (Kind) { 4739302bd664d930e7e6b61e208b0cca06fe71e8eb3Rafael Espindola case MCExpr::SymbolRef: { 4749302bd664d930e7e6b61e208b0cca06fe71e8eb3Rafael Espindola const MCSymbolRefExpr *Ref = static_cast<const MCSymbolRefExpr*>(Value); 4759302bd664d930e7e6b61e208b0cca06fe71e8eb3Rafael Espindola S = &Ref->getSymbol(); 4769302bd664d930e7e6b61e208b0cca06fe71e8eb3Rafael Espindola break; 4779302bd664d930e7e6b61e208b0cca06fe71e8eb3Rafael Espindola } 4789302bd664d930e7e6b61e208b0cca06fe71e8eb3Rafael Espindola case MCExpr::Target: { 4799302bd664d930e7e6b61e208b0cca06fe71e8eb3Rafael Espindola const MCTargetExpr *TExp = static_cast<const MCTargetExpr*>(Value); 4809302bd664d930e7e6b61e208b0cca06fe71e8eb3Rafael Espindola MCValue Res; 4819302bd664d930e7e6b61e208b0cca06fe71e8eb3Rafael Espindola TExp->EvaluateAsRelocatableImpl(Res, NULL); 4829302bd664d930e7e6b61e208b0cca06fe71e8eb3Rafael Espindola S = &Res.getSymA()->getSymbol(); 4839302bd664d930e7e6b61e208b0cca06fe71e8eb3Rafael Espindola break; 4849302bd664d930e7e6b61e208b0cca06fe71e8eb3Rafael Espindola } 4859302bd664d930e7e6b61e208b0cca06fe71e8eb3Rafael Espindola default: 486a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola return *S; 4879302bd664d930e7e6b61e208b0cca06fe71e8eb3Rafael Espindola } 488152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola } 489de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola return *S; 490de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola} 491de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola 492115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbarvoid ELFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm) { 49388182132470527e27231f09b25a885893e528c66Rafael Espindola // The presence of symbol versions causes undefined symbols and 49488182132470527e27231f09b25a885893e528c66Rafael Espindola // versions declared with @@@ to be renamed. 49588182132470527e27231f09b25a885893e528c66Rafael Espindola 49688182132470527e27231f09b25a885893e528c66Rafael Espindola for (MCAssembler::symbol_iterator it = Asm.symbol_begin(), 49788182132470527e27231f09b25a885893e528c66Rafael Espindola ie = Asm.symbol_end(); it != ie; ++it) { 49888182132470527e27231f09b25a885893e528c66Rafael Espindola const MCSymbol &Alias = it->getSymbol(); 49988182132470527e27231f09b25a885893e528c66Rafael Espindola const MCSymbol &Symbol = AliasedSymbol(Alias); 500f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola MCSymbolData &SD = Asm.getSymbolData(Symbol); 501f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola 502f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola // Not an alias. 503f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola if (&Symbol == &Alias) 504f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola continue; 505f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola 50607ee63283cc2b9a4d6c98ecd30d1b721fe3cb29aBenjamin Kramer StringRef AliasName = Alias.getName(); 50788182132470527e27231f09b25a885893e528c66Rafael Espindola size_t Pos = AliasName.find('@'); 50888182132470527e27231f09b25a885893e528c66Rafael Espindola if (Pos == StringRef::npos) 50988182132470527e27231f09b25a885893e528c66Rafael Espindola continue; 51088182132470527e27231f09b25a885893e528c66Rafael Espindola 511f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola // Aliases defined with .symvar copy the binding from the symbol they alias. 512f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola // This is the first place we are able to copy this information. 513f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola it->setExternal(SD.isExternal()); 514f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola SetBinding(*it, GetBinding(SD)); 515f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola 51607ee63283cc2b9a4d6c98ecd30d1b721fe3cb29aBenjamin Kramer StringRef Rest = AliasName.substr(Pos); 51788182132470527e27231f09b25a885893e528c66Rafael Espindola if (!Symbol.isUndefined() && !Rest.startswith("@@@")) 51888182132470527e27231f09b25a885893e528c66Rafael Espindola continue; 51988182132470527e27231f09b25a885893e528c66Rafael Espindola 52083ff4d2b0d6133d48055a27fe25c5d241bca7e9bRafael Espindola // FIXME: produce a better error message. 52183ff4d2b0d6133d48055a27fe25c5d241bca7e9bRafael Espindola if (Symbol.isUndefined() && Rest.startswith("@@") && 52283ff4d2b0d6133d48055a27fe25c5d241bca7e9bRafael Espindola !Rest.startswith("@@@")) 52383ff4d2b0d6133d48055a27fe25c5d241bca7e9bRafael Espindola report_fatal_error("A @@ version cannot be undefined"); 52483ff4d2b0d6133d48055a27fe25c5d241bca7e9bRafael Espindola 52507ee63283cc2b9a4d6c98ecd30d1b721fe3cb29aBenjamin Kramer Renames.insert(std::make_pair(&Symbol, &Alias)); 52688182132470527e27231f09b25a885893e528c66Rafael Espindola } 52788182132470527e27231f09b25a885893e528c66Rafael Espindola} 52888182132470527e27231f09b25a885893e528c66Rafael Espindola 529115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbarvoid ELFObjectWriter::WriteSymbol(MCDataFragment *SymtabF, 530115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar MCDataFragment *ShndxF, 531115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar ELFSymbolData &MSD, 532115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar const MCAsmLayout &Layout) { 533de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola MCSymbolData &OrigData = *MSD.SymbolData; 534de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola MCSymbolData &Data = 535de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola Layout.getAssembler().getSymbolData(AliasedSymbol(OrigData.getSymbol())); 536152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola 5377be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola bool IsReserved = Data.isCommon() || Data.getSymbol().isAbsolute() || 5387be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Data.getSymbol().isVariable(); 5397be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola 540152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Binding = GetBinding(OrigData); 541152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Visibility = GetVisibility(OrigData); 542152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Type = GetType(Data); 543152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola 544152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Info = (Binding << ELF_STB_Shift) | (Type << ELF_STT_Shift); 545152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Other = Visibility; 546152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola 5472c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola uint64_t Value = SymbolValue(Data, Layout); 5483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Size = 0; 5493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCExpr *ESize; 5503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 551f7c10a3cff61c70efe8e405d9bdc5386e8e3fc0aRafael Espindola assert(!(Data.isCommon() && !Data.isExternal())); 552f7c10a3cff61c70efe8e405d9bdc5386e8e3fc0aRafael Espindola 5533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ESize = Data.getSize(); 5543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Data.getSize()) { 5553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCValue Res; 5563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (ESize->getKind() == MCExpr::Binary) { 5573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(ESize); 5583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (BE->EvaluateAsRelocatable(Res, &Layout)) { 56024f1206c7de0f21d309d27737071ad742d5ddf27Benjamin Kramer assert(!Res.getSymA() || !Res.getSymA()->getSymbol().isDefined()); 56124f1206c7de0f21d309d27737071ad742d5ddf27Benjamin Kramer assert(!Res.getSymB() || !Res.getSymB()->getSymbol().isDefined()); 562f230df9af4012f9510de664b6d62b128e26a5861Rafael Espindola Size = Res.getConstant(); 5633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else if (ESize->getKind() == MCExpr::Constant) { 565368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer Size = static_cast<const MCConstantExpr *>(ESize)->getValue(); 5663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 5673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(0 && "Unsupported size expression"); 5683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Write out the symbol table entry 5727be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola WriteSymbolEntry(SymtabF, ShndxF, MSD.StringIndex, Info, Value, 5737be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Size, Other, MSD.SectionIndex, IsReserved); 5743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 5753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 576115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbarvoid ELFObjectWriter::WriteSymbolTable(MCDataFragment *SymtabF, 577115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar MCDataFragment *ShndxF, 578115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar const MCAssembler &Asm, 579115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar const MCAsmLayout &Layout, 5804beee3d06bfebe3f3382893fcebc71d1aa3f290eRafael Espindola const SectionIndexMapTy &SectionIndexMap) { 5813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // The string table must be emitted first because we need the index 5823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // into the string table for all the symbol names. 5833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(StringTable.size() && "Missing string table"); 5843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // FIXME: Make sure the start of the symbol table is aligned. 5863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // The first entry is the undefined symbol entry. 5887be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola WriteSymbolEntry(SymtabF, ShndxF, 0, 0, 0, 0, 0, 0, false); 5893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Write the symbol table entries. 5913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LastLocalSymbolIndex = LocalSymbolData.size() + 1; 5923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = LocalSymbolData.size(); i != e; ++i) { 5933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData &MSD = LocalSymbolData[i]; 5947be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola WriteSymbol(SymtabF, ShndxF, MSD, Layout); 5953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 59771859c640f6a36251aca223fd503c58dc314e296Rafael Espindola // Write out a symbol table entry for each regular section. 5984beee3d06bfebe3f3382893fcebc71d1aa3f290eRafael Espindola for (MCAssembler::const_iterator i = Asm.begin(), e = Asm.end(); i != e; 5994beee3d06bfebe3f3382893fcebc71d1aa3f290eRafael Espindola ++i) { 600a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman const MCSectionELF &Section = 6014beee3d06bfebe3f3382893fcebc71d1aa3f290eRafael Espindola static_cast<const MCSectionELF&>(i->getSection()); 6024beee3d06bfebe3f3382893fcebc71d1aa3f290eRafael Espindola if (Section.getType() == ELF::SHT_RELA || 6034beee3d06bfebe3f3382893fcebc71d1aa3f290eRafael Espindola Section.getType() == ELF::SHT_REL || 6044beee3d06bfebe3f3382893fcebc71d1aa3f290eRafael Espindola Section.getType() == ELF::SHT_STRTAB || 6054beee3d06bfebe3f3382893fcebc71d1aa3f290eRafael Espindola Section.getType() == ELF::SHT_SYMTAB) 606a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman continue; 6077be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola WriteSymbolEntry(SymtabF, ShndxF, 0, ELF::STT_SECTION, 0, 0, 6084beee3d06bfebe3f3382893fcebc71d1aa3f290eRafael Espindola ELF::STV_DEFAULT, SectionIndexMap.lookup(&Section), false); 609a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman LastLocalSymbolIndex++; 610a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman } 6113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = ExternalSymbolData.size(); i != e; ++i) { 6133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData &MSD = ExternalSymbolData[i]; 6143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData &Data = *MSD.SymbolData; 6153223f19ff0920ffee686faba3bf74babf580e8a5Rafael Espindola assert(((Data.getFlags() & ELF_STB_Global) || 6163223f19ff0920ffee686faba3bf74babf580e8a5Rafael Espindola (Data.getFlags() & ELF_STB_Weak)) && 6173223f19ff0920ffee686faba3bf74babf580e8a5Rafael Espindola "External symbol requires STB_GLOBAL or STB_WEAK flag"); 6187be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola WriteSymbol(SymtabF, ShndxF, MSD, Layout); 619e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola if (GetBinding(Data) == ELF::STB_LOCAL) 6203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LastLocalSymbolIndex++; 6213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 6223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i) { 6243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData &MSD = UndefinedSymbolData[i]; 6253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData &Data = *MSD.SymbolData; 6267be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola WriteSymbol(SymtabF, ShndxF, MSD, Layout); 627e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola if (GetBinding(Data) == ELF::STB_LOCAL) 6283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LastLocalSymbolIndex++; 6293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 6303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 6313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6321f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindolaconst MCSymbol *ELFObjectWriter::SymbolToReloc(const MCAssembler &Asm, 6331f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola const MCValue &Target, 6341f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola const MCFragment &F) const { 6351f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola const MCSymbol &Symbol = Target.getSymA()->getSymbol(); 6361f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola const MCSymbol &ASymbol = AliasedSymbol(Symbol); 6371f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola const MCSymbol *RenamedP = Renames.lookup(&Symbol); 6381f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola 6391f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola if (!RenamedP) { 6401f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola if (Target.getSymA()->getKind() == MCSymbolRefExpr::VK_None || 6411f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola Asm.getSymbolData(Symbol).getFlags() & ELF_Other_Weakref) 6421f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola RenamedP = &ASymbol; 6431f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola else 6441f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola RenamedP = &Symbol; 6451f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola } 6461f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola const MCSymbol &Renamed = *RenamedP; 6471f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola 6481f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola MCSymbolData &SD = Asm.getSymbolData(Symbol); 6491f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola 6507eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola if (Symbol.isUndefined()) 6511f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola return &Renamed; 6521f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola 6531f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola if (SD.isExternal()) 6541f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola return &Renamed; 6557eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola 6567eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola const MCSectionELF &Section = 6577eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola static_cast<const MCSectionELF&>(Symbol.getSection()); 6587eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola 6591f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola if (Section.getKind().isBSS()) 6601f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola return NULL; 6617eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola 6628cecf253e45f144b9a7fd0ace85eeeeb0bebfc83Rafael Espindola MCSymbolRefExpr::VariantKind Kind = Target.getSymA()->getKind(); 6633729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola const MCSectionELF &Sec2 = 6643729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola static_cast<const MCSectionELF&>(F.getParent()->getSection()); 6653729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola 6668cecf253e45f144b9a7fd0ace85eeeeb0bebfc83Rafael Espindola if (&Sec2 != &Section && 667c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola (Kind == MCSymbolRefExpr::VK_PLT || 668c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola Kind == MCSymbolRefExpr::VK_GOTPCREL || 669c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola Kind == MCSymbolRefExpr::VK_GOTOFF)) 6701f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola return &Renamed; 6713729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola 6721f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola if (Section.getFlags() & MCSectionELF::SHF_MERGE) { 6731f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola if (Target.getConstant() != 0) 6741f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola return &Renamed; 6751f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola return NULL; 6761f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola } 677c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola 6781f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola return NULL; 67973ffea47d20bc9f559b4ce0c60166ee504073832Rafael Espindola} 68073ffea47d20bc9f559b4ce0c60166ee504073832Rafael Espindola 681e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer// FIXME: this is currently X86/X86_64 only 682115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbarvoid ELFObjectWriter::RecordRelocation(const MCAssembler &Asm, 683115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar const MCAsmLayout &Layout, 684115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar const MCFragment *Fragment, 685115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar const MCFixup &Fixup, 686115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar MCValue Target, 687115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar uint64_t &FixedValue) { 6883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming int64_t Addend = 0; 6898f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola int Index = 0; 69095c602ade3aa30de17abd53b85968a3feb8fdfbcBenjamin Kramer int64_t Value = Target.getConstant(); 69103f1b74aed795110f040b7588c8921c5de4bf1eaRafael Espindola const MCSymbol &Symbol = Target.getSymA()->getSymbol(); 6921f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola const MCSymbol *RelocSymbol = SymbolToReloc(Asm, Target, *Fragment); 6933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6940007489312ecb1b51ae275f1e452786480151a4cRafael Espindola bool IsPCRel = isFixupKindX86PCRel(Fixup.getKind()); 69581cfb8529b7fd1e98fefb79fb46b10301b93ab75Benjamin Kramer if (!Target.isAbsolute()) { 6969d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola if (const MCSymbolRefExpr *RefB = Target.getSymB()) { 6979d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola const MCSymbol &SymbolB = RefB->getSymbol(); 6989d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola MCSymbolData &SDB = Asm.getSymbolData(SymbolB); 6999d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola IsPCRel = true; 70055fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola MCSectionData *Sec = Fragment->getParent(); 70155fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola 70255fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola // Offset of the symbol in the section 70355fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola int64_t a = Layout.getSymbolAddress(&SDB) - Layout.getSectionAddress(Sec); 70455fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola 70555fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola // Ofeset of the relocation in the section 70655fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola int64_t b = Layout.getFragmentOffset(Fragment) + Fixup.getOffset(); 70755fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola Value += b - a; 7089d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola } 7099d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola 7101f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola if (!RelocSymbol) { 7111f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola MCSymbolData &SD = Asm.getSymbolData(Symbol); 7121f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola MCFragment *F = SD.getFragment(); 7131f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola 7148f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola Index = F->getParent()->getOrdinal(); 7157eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola 7167eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola MCSectionData *FSD = F->getParent(); 7177eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola // Offset of the symbol in the section 7187eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola Value += Layout.getSymbolAddress(&SD) - Layout.getSectionAddress(FSD); 7198f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola } else { 72003f1b74aed795110f040b7588c8921c5de4bf1eaRafael Espindola if (Asm.getSymbolData(Symbol).getFlags() & ELF_Other_Weakref) 7211f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola WeakrefUsedInReloc.insert(RelocSymbol); 72203f1b74aed795110f040b7588c8921c5de4bf1eaRafael Espindola else 7231f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola UsedInReloc.insert(RelocSymbol); 7248f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola Index = -1; 7258f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola } 7267eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola Addend = Value; 7277eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola // Compensate for the addend on i386. 7287eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola if (Is64Bit) 7297eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola Value = 0; 7303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 7313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 73295c602ade3aa30de17abd53b85968a3feb8fdfbcBenjamin Kramer FixedValue = Value; 73395c602ade3aa30de17abd53b85968a3feb8fdfbcBenjamin Kramer 7343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // determine the type of the relocation 73528f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola 73628f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola MCSymbolRefExpr::VariantKind Modifier = Target.getSymA()->getKind(); 73763d37b932278724d51e7f8bd1f2574c7b45f85f0Benjamin Kramer unsigned Type; 738e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer if (Is64Bit) { 739e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer if (IsPCRel) { 74092bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola switch (Modifier) { 7419edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola default: 7429edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola llvm_unreachable("Unimplemented"); 74392bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola case MCSymbolRefExpr::VK_None: 74492bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola Type = ELF::R_X86_64_PC32; 74592bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola break; 74692bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola case MCSymbolRefExpr::VK_PLT: 74792bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola Type = ELF::R_X86_64_PLT32; 74892bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola break; 749a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_GOTPCREL: 750607d1f6d3216b647c07965bafae8d1aba6312136Rafael Espindola Type = ELF::R_X86_64_GOTPCREL; 751607d1f6d3216b647c07965bafae8d1aba6312136Rafael Espindola break; 752bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola case MCSymbolRefExpr::VK_GOTTPOFF: 753bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola Type = ELF::R_X86_64_GOTTPOFF; 754bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola break; 755bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola case MCSymbolRefExpr::VK_TLSGD: 756bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola Type = ELF::R_X86_64_TLSGD; 757bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola break; 758b4d1721eff7b43577e5f2e53f885973fb6c43683Rafael Espindola case MCSymbolRefExpr::VK_TLSLD: 759b4d1721eff7b43577e5f2e53f885973fb6c43683Rafael Espindola Type = ELF::R_X86_64_TLSLD; 760b4d1721eff7b43577e5f2e53f885973fb6c43683Rafael Espindola break; 76192bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola } 762e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } else { 763e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer switch ((unsigned)Fixup.getKind()) { 764e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer default: llvm_unreachable("invalid fixup kind!"); 765e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_8: Type = ELF::R_X86_64_64; break; 766a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola case X86::reloc_signed_4byte: 767e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case X86::reloc_pcrel_4byte: 768a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola assert(isInt<32>(Target.getConstant())); 76928f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola switch (Modifier) { 7709edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola default: 7719edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola llvm_unreachable("Unimplemented"); 77228f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola case MCSymbolRefExpr::VK_None: 77328f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola Type = ELF::R_X86_64_32S; 77428f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola break; 77528f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola case MCSymbolRefExpr::VK_GOT: 77628f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola Type = ELF::R_X86_64_GOT32; 77728f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola break; 778c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola case MCSymbolRefExpr::VK_GOTPCREL: 7798cecf253e45f144b9a7fd0ace85eeeeb0bebfc83Rafael Espindola Type = ELF::R_X86_64_GOTPCREL; 7808cecf253e45f144b9a7fd0ace85eeeeb0bebfc83Rafael Espindola break; 781bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola case MCSymbolRefExpr::VK_TPOFF: 782bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola Type = ELF::R_X86_64_TPOFF32; 783bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola break; 784aa8f1f01352bdaaabf712369f8a8a615c776b508Rafael Espindola case MCSymbolRefExpr::VK_DTPOFF: 785aa8f1f01352bdaaabf712369f8a8a615c776b508Rafael Espindola Type = ELF::R_X86_64_DTPOFF32; 786aa8f1f01352bdaaabf712369f8a8a615c776b508Rafael Espindola break; 78728f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola } 788a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola break; 789e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_4: 790a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola Type = ELF::R_X86_64_32; 791e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer break; 792e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_2: Type = ELF::R_X86_64_16; break; 793e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case X86::reloc_pcrel_1byte: 794e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_1: Type = ELF::R_X86_64_8; break; 795e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } 796e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } 7973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 798e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer if (IsPCRel) { 7999edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola switch (Modifier) { 8009edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola default: 80124dc9ecdc55d732ac93fc782d6232413fe2c1160Rafael Espindola llvm_unreachable("Unimplemented"); 80224dc9ecdc55d732ac93fc782d6232413fe2c1160Rafael Espindola case MCSymbolRefExpr::VK_None: 8039baee3b3a3924bc45d007e54c71333739d135f8eRafael Espindola Type = ELF::R_386_PC32; 8049baee3b3a3924bc45d007e54c71333739d135f8eRafael Espindola break; 8059edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola case MCSymbolRefExpr::VK_PLT: 8069edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola Type = ELF::R_386_PLT32; 8079edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola break; 8089edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola } 809e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } else { 810e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer switch ((unsigned)Fixup.getKind()) { 811e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer default: llvm_unreachable("invalid fixup kind!"); 812a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola 81324ba4f7f5f27c8d64be7ad653863b33594e5f019Rafael Espindola case X86::reloc_global_offset_table: 81424ba4f7f5f27c8d64be7ad653863b33594e5f019Rafael Espindola Type = ELF::R_386_GOTPC; 81524ba4f7f5f27c8d64be7ad653863b33594e5f019Rafael Espindola break; 81624ba4f7f5f27c8d64be7ad653863b33594e5f019Rafael Espindola 817a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola // FIXME: Should we avoid selecting reloc_signed_4byte in 32 bit mode 818a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola // instead? 819a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola case X86::reloc_signed_4byte: 820e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case X86::reloc_pcrel_4byte: 821bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola case FK_Data_4: 822c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola switch (Modifier) { 8239edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola default: 8249edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola llvm_unreachable("Unimplemented"); 825bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola case MCSymbolRefExpr::VK_None: 82624ba4f7f5f27c8d64be7ad653863b33594e5f019Rafael Espindola Type = ELF::R_386_32; 827bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola break; 828eada30479399014c22c7b7edb008177c312eefeeRafael Espindola case MCSymbolRefExpr::VK_GOT: 829eada30479399014c22c7b7edb008177c312eefeeRafael Espindola Type = ELF::R_386_GOT32; 830eada30479399014c22c7b7edb008177c312eefeeRafael Espindola break; 831c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola case MCSymbolRefExpr::VK_GOTOFF: 832c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola Type = ELF::R_386_GOTOFF; 833c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola break; 8343cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola case MCSymbolRefExpr::VK_TLSGD: 8353cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola Type = ELF::R_386_TLS_GD; 8363cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola break; 8373cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola case MCSymbolRefExpr::VK_TPOFF: 8383cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola Type = ELF::R_386_TLS_LE_32; 8393cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola break; 8403cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola case MCSymbolRefExpr::VK_INDNTPOFF: 8413cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola Type = ELF::R_386_TLS_IE; 8423cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola break; 8433cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola case MCSymbolRefExpr::VK_NTPOFF: 8443cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola Type = ELF::R_386_TLS_LE; 8453cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola break; 846a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_GOTNTPOFF: 847a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola Type = ELF::R_386_TLS_GOTIE; 848a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola break; 849a264f72d3fb9dec1427480fcf17ef3c746ea723aRafael Espindola case MCSymbolRefExpr::VK_TLSLDM: 850a264f72d3fb9dec1427480fcf17ef3c746ea723aRafael Espindola Type = ELF::R_386_TLS_LDM; 851a264f72d3fb9dec1427480fcf17ef3c746ea723aRafael Espindola break; 8520cf15d61b7e3bf53f5a99f58ada37b93bc039559Rafael Espindola case MCSymbolRefExpr::VK_DTPOFF: 8530cf15d61b7e3bf53f5a99f58ada37b93bc039559Rafael Espindola Type = ELF::R_386_TLS_LDO_32; 8540cf15d61b7e3bf53f5a99f58ada37b93bc039559Rafael Espindola break; 855c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola } 856c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola break; 857e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_2: Type = ELF::R_386_16; break; 858e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case X86::reloc_pcrel_1byte: 859e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_1: Type = ELF::R_386_8; break; 860e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } 8613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 8623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 8633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 864a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola if (RelocNeedsGOT(Modifier)) 8655c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola NeedsGOT = true; 8665c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola 867e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer ELFRelocationEntry ERE; 868e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer 8698f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ERE.Index = Index; 8708f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ERE.Type = Type; 8711f52dfe69ee7d0a49a6bfe6dfec6aeb8e416e313Rafael Espindola ERE.Symbol = RelocSymbol; 8723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 87363d37b932278724d51e7f8bd1f2574c7b45f85f0Benjamin Kramer ERE.r_offset = Layout.getFragmentOffset(Fragment) + Fixup.getOffset(); 874e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer 8753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (HasRelocationAddend) 8763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ERE.r_addend = Addend; 877172d7d6a12b313dd5a8c1588b8f6bd49b1ce16b6Benjamin Kramer else 878172d7d6a12b313dd5a8c1588b8f6bd49b1ce16b6Benjamin Kramer ERE.r_addend = 0; // Silence compiler warning. 8793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Relocations[Fragment->getParent()].push_back(ERE); 8813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 8823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8830b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin Krameruint64_t 884115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel DunbarELFObjectWriter::getSymbolIndexInSymbolTable(const MCAssembler &Asm, 885115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar const MCSymbol *S) { 8867b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer MCSymbolData &SD = Asm.getSymbolData(*S); 887ab4a7afe98fcd86418bd1672f880b7d3672f4543Rafael Espindola return SD.getIndex(); 8883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 8893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 890737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindolastatic bool isInSymtab(const MCAssembler &Asm, const MCSymbolData &Data, 89188182132470527e27231f09b25a885893e528c66Rafael Espindola bool Used, bool Renamed) { 892484291c27319668ad99cb87def000254357736fbRafael Espindola if (Data.getFlags() & ELF_Other_Weakref) 893484291c27319668ad99cb87def000254357736fbRafael Espindola return false; 894484291c27319668ad99cb87def000254357736fbRafael Espindola 895bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola if (Used) 896bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola return true; 897bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola 89888182132470527e27231f09b25a885893e528c66Rafael Espindola if (Renamed) 89988182132470527e27231f09b25a885893e528c66Rafael Espindola return false; 90088182132470527e27231f09b25a885893e528c66Rafael Espindola 901737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola const MCSymbol &Symbol = Data.getSymbol(); 902a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola 903d179886f0595eb3564a9edfdfff79def130d89ccRafael Espindola if (Symbol.getName() == "_GLOBAL_OFFSET_TABLE_") 904d179886f0595eb3564a9edfdfff79def130d89ccRafael Espindola return true; 905d179886f0595eb3564a9edfdfff79def130d89ccRafael Espindola 906a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola const MCSymbol &A = AliasedSymbol(Symbol); 907d179886f0595eb3564a9edfdfff79def130d89ccRafael Espindola if (!A.isVariable() && A.isUndefined() && !Data.isCommon()) 908a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola return false; 909a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola 910737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola if (!Asm.isSymbolLinkerVisible(Symbol) && !Symbol.isUndefined()) 911737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return false; 912737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 913bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola if (Symbol.isTemporary()) 914737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return false; 915737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 916737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return true; 917737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola} 918737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 9191f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindolastatic bool isLocal(const MCSymbolData &Data, bool isSignature, 9201f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola bool isUsedInReloc) { 921737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola if (Data.isExternal()) 922737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return false; 923737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 924737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola const MCSymbol &Symbol = Data.getSymbol(); 9251f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola const MCSymbol &RefSymbol = AliasedSymbol(Symbol); 9261f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola 9271f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola if (RefSymbol.isUndefined() && !RefSymbol.isVariable()) { 9281f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola if (isSignature && !isUsedInReloc) 9291f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola return true; 9301f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola 931737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return false; 9321f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola } 933737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 934737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return true; 935737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola} 936737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 937115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbarvoid ELFObjectWriter::ComputeIndexMap(MCAssembler &Asm, 938115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar SectionIndexMapTy &SectionIndexMap) { 939bab2a80525956b03b5f9126e1496785493326c37Rafael Espindola unsigned Index = 1; 940bab2a80525956b03b5f9126e1496785493326c37Rafael Espindola for (MCAssembler::iterator it = Asm.begin(), 941bab2a80525956b03b5f9126e1496785493326c37Rafael Espindola ie = Asm.end(); it != ie; ++it) { 942bab2a80525956b03b5f9126e1496785493326c37Rafael Espindola const MCSectionELF &Section = 943bab2a80525956b03b5f9126e1496785493326c37Rafael Espindola static_cast<const MCSectionELF &>(it->getSection()); 9442ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola if (Section.getType() != ELF::SHT_GROUP) 9452ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola continue; 9462ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola SectionIndexMap[&Section] = Index++; 9472ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola } 9482ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola 9492ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola for (MCAssembler::iterator it = Asm.begin(), 9502ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola ie = Asm.end(); it != ie; ++it) { 9512ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola const MCSectionELF &Section = 9522ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola static_cast<const MCSectionELF &>(it->getSection()); 9532ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola if (Section.getType() == ELF::SHT_GROUP) 9542ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola continue; 955bab2a80525956b03b5f9126e1496785493326c37Rafael Espindola SectionIndexMap[&Section] = Index++; 956bab2a80525956b03b5f9126e1496785493326c37Rafael Espindola } 957bab2a80525956b03b5f9126e1496785493326c37Rafael Espindola} 958bab2a80525956b03b5f9126e1496785493326c37Rafael Espindola 959115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbarvoid ELFObjectWriter::ComputeSymbolTable(MCAssembler &Asm, 9601f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola const SectionIndexMapTy &SectionIndexMap, 9611f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola RevGroupMapTy RevGroupMap) { 9625c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola // FIXME: Is this the correct place to do this? 9635c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola if (NeedsGOT) { 9645c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola llvm::StringRef Name = "_GLOBAL_OFFSET_TABLE_"; 9655c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola MCSymbol *Sym = Asm.getContext().GetOrCreateSymbol(Name); 9665c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola MCSymbolData &Data = Asm.getOrCreateSymbolData(*Sym); 9675c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola Data.setExternal(true); 968f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola SetBinding(Data, ELF::STB_GLOBAL); 9695c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola } 9705c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola 9713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Build section lookup table. 972ab4a7afe98fcd86418bd1672f880b7d3672f4543Rafael Espindola int NumRegularSections = Asm.size(); 9733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Index 0 is always the empty string. 9753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StringMap<uint64_t> StringIndexMap; 9763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StringTable += '\x00'; 9773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 978a0949b50dcea35c08b50542091f97275f401529dRafael Espindola // Add the data for the symbols. 9793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::symbol_iterator it = Asm.symbol_begin(), 9803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.symbol_end(); it != ie; ++it) { 9813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSymbol &Symbol = it->getSymbol(); 9823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 983484291c27319668ad99cb87def000254357736fbRafael Espindola bool Used = UsedInReloc.count(&Symbol); 984484291c27319668ad99cb87def000254357736fbRafael Espindola bool WeakrefUsed = WeakrefUsedInReloc.count(&Symbol); 9851f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola bool isSignature = RevGroupMap.count(&Symbol); 9861f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola 9871f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola if (!isInSymtab(Asm, *it, 9881f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola Used || WeakrefUsed || isSignature, 98988182132470527e27231f09b25a885893e528c66Rafael Espindola Renames.count(&Symbol))) 9903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming continue; 9913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData MSD; 9933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MSD.SymbolData = it; 99488182132470527e27231f09b25a885893e528c66Rafael Espindola const MCSymbol &RefSymbol = AliasedSymbol(Symbol); 9953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9961f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola // Undefined symbols are global, but this is the first place we 9971f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola // are able to set it. 9981f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola bool Local = isLocal(*it, isSignature, Used); 9991f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola if (!Local && GetBinding(*it) == ELF::STB_LOCAL) { 10001f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola MCSymbolData &SD = Asm.getSymbolData(RefSymbol); 10011f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola SetBinding(*it, ELF::STB_GLOBAL); 10021f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola SetBinding(SD, ELF::STB_GLOBAL); 10031f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola } 10041f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola 1005484291c27319668ad99cb87def000254357736fbRafael Espindola if (RefSymbol.isUndefined() && !Used && WeakrefUsed) 1006484291c27319668ad99cb87def000254357736fbRafael Espindola SetBinding(*it, ELF::STB_WEAK); 1007484291c27319668ad99cb87def000254357736fbRafael Espindola 1008f7c10a3cff61c70efe8e405d9bdc5386e8e3fc0aRafael Espindola if (it->isCommon()) { 1009a0949b50dcea35c08b50542091f97275f401529dRafael Espindola assert(!Local); 1010f7c10a3cff61c70efe8e405d9bdc5386e8e3fc0aRafael Espindola MSD.SectionIndex = ELF::SHN_COMMON; 1011bf052ac5d1c8f21075bc675f629709c20791c5f7Rafael Espindola } else if (Symbol.isAbsolute() || RefSymbol.isVariable()) { 1012a0949b50dcea35c08b50542091f97275f401529dRafael Espindola MSD.SectionIndex = ELF::SHN_ABS; 101388182132470527e27231f09b25a885893e528c66Rafael Espindola } else if (RefSymbol.isUndefined()) { 10141f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola if (isSignature && !Used) 10151f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola MSD.SectionIndex = SectionIndexMap.lookup(RevGroupMap[&Symbol]); 10161f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola else 10171f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola MSD.SectionIndex = ELF::SHN_UNDEF; 10183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 1019bab2a80525956b03b5f9126e1496785493326c37Rafael Espindola const MCSectionELF &Section = 1020bab2a80525956b03b5f9126e1496785493326c37Rafael Espindola static_cast<const MCSectionELF&>(RefSymbol.getSection()); 1021bab2a80525956b03b5f9126e1496785493326c37Rafael Espindola MSD.SectionIndex = SectionIndexMap.lookup(&Section); 10227be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola if (MSD.SectionIndex >= ELF::SHN_LORESERVE) 10237be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola NeedsSymtabShndx = true; 10243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(MSD.SectionIndex && "Invalid section index!"); 10255df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola } 10265df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola 102788182132470527e27231f09b25a885893e528c66Rafael Espindola // The @@@ in symbol version is replaced with @ in undefined symbols and 102888182132470527e27231f09b25a885893e528c66Rafael Espindola // @@ in defined ones. 102988182132470527e27231f09b25a885893e528c66Rafael Espindola StringRef Name = Symbol.getName(); 10301261a2ff99299946952013f284615a06afa3dc50Benjamin Kramer SmallString<32> Buf; 10311261a2ff99299946952013f284615a06afa3dc50Benjamin Kramer 103288182132470527e27231f09b25a885893e528c66Rafael Espindola size_t Pos = Name.find("@@@"); 103388182132470527e27231f09b25a885893e528c66Rafael Espindola if (Pos != StringRef::npos) { 10341261a2ff99299946952013f284615a06afa3dc50Benjamin Kramer Buf += Name.substr(0, Pos); 10351261a2ff99299946952013f284615a06afa3dc50Benjamin Kramer unsigned Skip = MSD.SectionIndex == ELF::SHN_UNDEF ? 2 : 1; 10361261a2ff99299946952013f284615a06afa3dc50Benjamin Kramer Buf += Name.substr(Pos + Skip); 10371261a2ff99299946952013f284615a06afa3dc50Benjamin Kramer Name = Buf; 103888182132470527e27231f09b25a885893e528c66Rafael Espindola } 103988182132470527e27231f09b25a885893e528c66Rafael Espindola 10401261a2ff99299946952013f284615a06afa3dc50Benjamin Kramer uint64_t &Entry = StringIndexMap[Name]; 1041a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola if (!Entry) { 1042a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola Entry = StringTable.size(); 10431261a2ff99299946952013f284615a06afa3dc50Benjamin Kramer StringTable += Name; 1044a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola StringTable += '\x00'; 10453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1046a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola MSD.StringIndex = Entry; 1047a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola if (MSD.SectionIndex == ELF::SHN_UNDEF) 1048a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola UndefinedSymbolData.push_back(MSD); 1049a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola else if (Local) 1050a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola LocalSymbolData.push_back(MSD); 1051a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola else 1052a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola ExternalSymbolData.push_back(MSD); 10533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 10543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Symbols are required to be in lexicographic order. 10563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(LocalSymbolData.begin(), LocalSymbolData.end()); 10573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(ExternalSymbolData.begin(), ExternalSymbolData.end()); 10583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(UndefinedSymbolData.begin(), UndefinedSymbolData.end()); 10593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Set the symbol indices. Local symbols must come before all other 10613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // symbols with non-local bindings. 1062ab4a7afe98fcd86418bd1672f880b7d3672f4543Rafael Espindola unsigned Index = 1; 10633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = LocalSymbolData.size(); i != e; ++i) 10643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LocalSymbolData[i].SymbolData->setIndex(Index++); 1065ab4a7afe98fcd86418bd1672f880b7d3672f4543Rafael Espindola 1066ab4a7afe98fcd86418bd1672f880b7d3672f4543Rafael Espindola Index += NumRegularSections; 1067ab4a7afe98fcd86418bd1672f880b7d3672f4543Rafael Espindola 10683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = ExternalSymbolData.size(); i != e; ++i) 10693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ExternalSymbolData[i].SymbolData->setIndex(Index++); 10703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i) 10713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming UndefinedSymbolData[i].SymbolData->setIndex(Index++); 10723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 10733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1074115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbarvoid ELFObjectWriter::WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout, 1075115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar const MCSectionData &SD) { 10763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (!Relocations[&SD].empty()) { 10773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCContext &Ctx = Asm.getContext(); 10784283f4b81e8c1cbf5c7a7b51e949e109ae25ff8cRafael Espindola const MCSectionELF *RelaSection; 10793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionELF &Section = 10803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming static_cast<const MCSectionELF&>(SD.getSection()); 10813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const StringRef SectionName = Section.getSectionName(); 1083377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer std::string RelaSectionName = HasRelocationAddend ? ".rela" : ".rel"; 10843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming RelaSectionName += SectionName; 1085299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer 1086299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer unsigned EntrySize; 1087299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer if (HasRelocationAddend) 1088299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer EntrySize = Is64Bit ? sizeof(ELF::Elf64_Rela) : sizeof(ELF::Elf32_Rela); 1089299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer else 1090299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer EntrySize = Is64Bit ? sizeof(ELF::Elf64_Rel) : sizeof(ELF::Elf32_Rel); 10913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1092377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer RelaSection = Ctx.getELFSection(RelaSectionName, HasRelocationAddend ? 1093377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer ELF::SHT_RELA : ELF::SHT_REL, 0, 10943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionKind::getReadOnly(), 10952ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola EntrySize, ""); 10963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSectionData &RelaSD = Asm.getOrCreateSectionData(*RelaSection); 1098a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer RelaSD.setAlignment(Is64Bit ? 8 : 4); 10993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCDataFragment *F = new MCDataFragment(&RelaSD); 11013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteRelocationsFragment(Asm, F, &SD); 11033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1104115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar Asm.AddSectionToTheEnd(*this, RelaSD, Layout); 11053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 11063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 11073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1108115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbarvoid ELFObjectWriter::WriteSecHdrEntry(uint32_t Name, uint32_t Type, 1109115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar uint64_t Flags, uint64_t Address, 1110115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar uint64_t Offset, uint64_t Size, 1111115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar uint32_t Link, uint32_t Info, 1112115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar uint64_t Alignment, 1113115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar uint64_t EntrySize) { 11143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Name); // sh_name: index into string table 11153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Type); // sh_type 11163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Flags); // sh_flags 11173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Address); // sh_addr 11183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Offset); // sh_offset 11193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Size); // sh_size 11203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Link); // sh_link 11213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Info); // sh_info 11223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Alignment); // sh_addralign 11233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(EntrySize); // sh_entsize 11243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 11253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1126115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbarvoid ELFObjectWriter::WriteRelocationsFragment(const MCAssembler &Asm, 1127115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar MCDataFragment *F, 1128115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar const MCSectionData *SD) { 11293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFRelocationEntry> &Relocs = Relocations[SD]; 11303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // sort by the r_offset just like gnu as does 11313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(Relocs.begin(), Relocs.end()); 11323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = Relocs.size(); i != e; ++i) { 11343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFRelocationEntry entry = Relocs[e - i - 1]; 11353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11368f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola if (entry.Index < 0) 11378f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola entry.Index = getSymbolIndexInSymbolTable(Asm, entry.Symbol); 11388f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola else 11398f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola entry.Index += LocalSymbolData.size() + 1; 11405e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer if (Is64Bit) { 1141af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String64(*F, entry.r_offset); 11425e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer 11438f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola struct ELF::Elf64_Rela ERE64; 11448f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ERE64.setSymbolAndType(entry.Index, entry.Type); 1145af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String64(*F, ERE64.r_info); 11465e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer 1147af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola if (HasRelocationAddend) 1148af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String64(*F, entry.r_addend); 11495e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer } else { 1150af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String32(*F, entry.r_offset); 11515e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer 11528f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola struct ELF::Elf32_Rela ERE32; 11538f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ERE32.setSymbolAndType(entry.Index, entry.Type); 1154af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String32(*F, ERE32.r_info); 11555e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer 1156af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola if (HasRelocationAddend) 1157af3d38f70ebba9fec0048c2540dbdf0168d280d2Rafael Espindola String32(*F, entry.r_addend); 11585e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer } 11593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 11603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 11613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1162115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbarvoid ELFObjectWriter::CreateMetadataSections(MCAssembler &Asm, 1163115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar MCAsmLayout &Layout, 11644beee3d06bfebe3f3382893fcebc71d1aa3f290eRafael Espindola const SectionIndexMapTy &SectionIndexMap) { 11653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCContext &Ctx = Asm.getContext(); 11663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCDataFragment *F; 11673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned EntrySize = Is64Bit ? ELF::SYMENTRY_SIZE64 : ELF::SYMENTRY_SIZE32; 11693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 117038738bf1a847292003a5495f17e42a75d1274bf7Rafael Espindola // We construct .shstrtab, .symtab and .strtab in this order to match gnu as. 11714283f4b81e8c1cbf5c7a7b51e949e109ae25ff8cRafael Espindola const MCSectionELF *ShstrtabSection = 11727be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Ctx.getELFSection(".shstrtab", ELF::SHT_STRTAB, 0, 11733f2d13c98eb04962bf6fcfdcc6f62789bc820d79Rafael Espindola SectionKind::getReadOnly()); 117471859c640f6a36251aca223fd503c58dc314e296Rafael Espindola MCSectionData &ShstrtabSD = Asm.getOrCreateSectionData(*ShstrtabSection); 117571859c640f6a36251aca223fd503c58dc314e296Rafael Espindola ShstrtabSD.setAlignment(1); 117671859c640f6a36251aca223fd503c58dc314e296Rafael Espindola ShstrtabIndex = Asm.size(); 117771859c640f6a36251aca223fd503c58dc314e296Rafael Espindola 11784283f4b81e8c1cbf5c7a7b51e949e109ae25ff8cRafael Espindola const MCSectionELF *SymtabSection = 11797be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Ctx.getELFSection(".symtab", ELF::SHT_SYMTAB, 0, 11807be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SectionKind::getReadOnly(), 11812ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola EntrySize, ""); 11823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSectionData &SymtabSD = Asm.getOrCreateSectionData(*SymtabSection); 11833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SymtabSD.setAlignment(Is64Bit ? 8 : 4); 11847be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SymbolTableIndex = Asm.size(); 11857be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola 11867be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola MCSectionData *SymtabShndxSD = NULL; 11877be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola 11887be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola if (NeedsSymtabShndx) { 11894283f4b81e8c1cbf5c7a7b51e949e109ae25ff8cRafael Espindola const MCSectionELF *SymtabShndxSection = 11907be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola Ctx.getELFSection(".symtab_shndx", ELF::SHT_SYMTAB_SHNDX, 0, 11912ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola SectionKind::getReadOnly(), 4, ""); 11927be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SymtabShndxSD = &Asm.getOrCreateSectionData(*SymtabShndxSection); 11937be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola SymtabShndxSD->setAlignment(4); 11947be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola } 11953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSection *StrtabSection; 11973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StrtabSection = Ctx.getELFSection(".strtab", ELF::SHT_STRTAB, 0, 11983f2d13c98eb04962bf6fcfdcc6f62789bc820d79Rafael Espindola SectionKind::getReadOnly()); 11993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSectionData &StrtabSD = Asm.getOrCreateSectionData(*StrtabSection); 12003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StrtabSD.setAlignment(1); 12013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StringTableIndex = Asm.size(); 12023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1203c3c413f63117896f186fc4385bdaac0578d3613fRafael Espindola WriteRelocations(Asm, Layout); 120471859c640f6a36251aca223fd503c58dc314e296Rafael Espindola 120571859c640f6a36251aca223fd503c58dc314e296Rafael Espindola // Symbol table 120671859c640f6a36251aca223fd503c58dc314e296Rafael Espindola F = new MCDataFragment(&SymtabSD); 12077be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola MCDataFragment *ShndxF = NULL; 12087be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola if (NeedsSymtabShndx) { 12097be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola ShndxF = new MCDataFragment(SymtabShndxSD); 1210115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar Asm.AddSectionToTheEnd(*this, *SymtabShndxSD, Layout); 12117be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola } 12124beee3d06bfebe3f3382893fcebc71d1aa3f290eRafael Espindola WriteSymbolTable(F, ShndxF, Asm, Layout, SectionIndexMap); 1213115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar Asm.AddSectionToTheEnd(*this, SymtabSD, Layout); 121471859c640f6a36251aca223fd503c58dc314e296Rafael Espindola 12153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F = new MCDataFragment(&StrtabSD); 12163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents().append(StringTable.begin(), StringTable.end()); 1217115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar Asm.AddSectionToTheEnd(*this, StrtabSD, Layout); 12183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F = new MCDataFragment(&ShstrtabSD); 12203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Section header string table. 12223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 12233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // The first entry of a string table holds a null character so skip 12243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // section 0. 12253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Index = 1; 12263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += '\x00'; 12273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12282ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola StringMap<uint64_t> SecStringMap; 12293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 12303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 12313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionELF &Section = 1232368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer static_cast<const MCSectionELF&>(it->getSection()); 123351efe7a253190b672519e8388ce5d45f1dcf1a24Rafael Espindola // FIXME: We could merge suffixes like in .text and .rela.text. 12343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12352ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola StringRef Name = Section.getSectionName(); 12362ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola if (SecStringMap.count(Name)) { 12372ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola SectionStringTableIndex[&Section] = SecStringMap[Name]; 12382ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola continue; 12392ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola } 12403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Remember the index into the string table so we can write it 12413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // into the sh_name field of the section header table. 12422ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola SectionStringTableIndex[&Section] = Index; 12432ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola SecStringMap[Name] = Index; 12443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12452ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola Index += Name.size() + 1; 12462ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola F->getContents() += Name; 12473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += '\x00'; 12483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 12493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1250115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar Asm.AddSectionToTheEnd(*this, ShstrtabSD, Layout); 12517070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola} 12527070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 1253115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbarbool ELFObjectWriter::IsFixupFullyResolved(const MCAssembler &Asm, 1254115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar const MCValue Target, 1255115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar bool IsPCRel, 1256115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar const MCFragment *DF) const { 12577070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola // If this is a PCrel relocation, find the section this fixup value is 12587070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola // relative to. 12597070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSection *BaseSection = 0; 12607070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (IsPCRel) { 12617070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola BaseSection = &DF->getParent()->getSection(); 12627070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola assert(BaseSection); 12637070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola } 12647070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 12657070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSection *SectionA = 0; 12667070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSymbol *SymbolA = 0; 12677070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (const MCSymbolRefExpr *A = Target.getSymA()) { 12687070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola SymbolA = &A->getSymbol(); 12697070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola SectionA = &SymbolA->getSection(); 12707070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola } 12717070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 12727070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSection *SectionB = 0; 12737070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (const MCSymbolRefExpr *B = Target.getSymB()) { 12747070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola SectionB = &B->getSymbol().getSection(); 12757070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola } 12767070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 12777070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (!BaseSection) 12787070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola return SectionA == SectionB; 12797070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 12807070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSymbolData &DataA = Asm.getSymbolData(*SymbolA); 12817070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (DataA.isExternal()) 12827070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola return false; 12837070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 12847070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola return !SectionB && BaseSection == SectionA; 12853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 12863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1287115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbarvoid ELFObjectWriter::CreateGroupSections(MCAssembler &Asm, 1288115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar MCAsmLayout &Layout, 12891f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola GroupMapTy &GroupMap, 12901f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola RevGroupMapTy &RevGroupMap) { 12912ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola // Build the groups 12922ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola for (MCAssembler::const_iterator it = Asm.begin(), ie = Asm.end(); 12932ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola it != ie; ++it) { 12942ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola const MCSectionELF &Section = 12952ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola static_cast<const MCSectionELF&>(it->getSection()); 12962ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola if (!(Section.getFlags() & MCSectionELF::SHF_GROUP)) 12972ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola continue; 12982ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola 12992ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola const MCSymbol *SignatureSymbol = Section.getGroup(); 13002ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola Asm.getOrCreateSymbolData(*SignatureSymbol); 13011f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola const MCSectionELF *&Group = RevGroupMap[SignatureSymbol]; 13022ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola if (!Group) { 13032ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola Group = Asm.getContext().CreateELFGroupSection(); 13042ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola MCSectionData &Data = Asm.getOrCreateSectionData(*Group); 13052ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola Data.setAlignment(4); 13062ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola MCDataFragment *F = new MCDataFragment(&Data); 13072ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola String32(*F, ELF::GRP_COMDAT); 13082ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola } 13092ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola GroupMap[Group] = SignatureSymbol; 13102ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola } 13112ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola 13122ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola // Add sections to the groups 13132ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola unsigned Index = 1; 13141f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola unsigned NumGroups = RevGroupMap.size(); 13152ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola for (MCAssembler::const_iterator it = Asm.begin(), ie = Asm.end(); 13162ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola it != ie; ++it, ++Index) { 13172ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola const MCSectionELF &Section = 13182ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola static_cast<const MCSectionELF&>(it->getSection()); 13192ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola if (!(Section.getFlags() & MCSectionELF::SHF_GROUP)) 13202ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola continue; 13211f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola const MCSectionELF *Group = RevGroupMap[Section.getGroup()]; 13222ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola MCSectionData &Data = Asm.getOrCreateSectionData(*Group); 13232ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola // FIXME: we could use the previous fragment 13242ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola MCDataFragment *F = new MCDataFragment(&Data); 13252ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola String32(*F, NumGroups + Index); 13262ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola } 13272ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola 13281f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola for (RevGroupMapTy::const_iterator i = RevGroupMap.begin(), 13291f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola e = RevGroupMap.end(); i != e; ++i) { 13302ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola const MCSectionELF *Group = i->second; 13312ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola MCSectionData &Data = Asm.getOrCreateSectionData(*Group); 1332115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar Asm.AddSectionToTheEnd(*this, Data, Layout); 13332ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola } 13342ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola} 13352ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola 1336115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbarvoid ELFObjectWriter::WriteSection(MCAssembler &Asm, 1337115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar const SectionIndexMapTy &SectionIndexMap, 1338115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar uint32_t GroupSymbolIndex, 1339115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar uint64_t Offset, uint64_t Size, 1340115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar uint64_t Alignment, 1341115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar const MCSectionELF &Section) { 1342c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola uint64_t sh_link = 0; 1343c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola uint64_t sh_info = 0; 1344c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola 1345c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola switch(Section.getType()) { 1346c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola case ELF::SHT_DYNAMIC: 1347c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola sh_link = SectionStringTableIndex[&Section]; 1348c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola sh_info = 0; 1349c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola break; 1350c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola 1351c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola case ELF::SHT_REL: 1352c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola case ELF::SHT_RELA: { 1353c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola const MCSectionELF *SymtabSection; 1354c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola const MCSectionELF *InfoSection; 1355c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola SymtabSection = Asm.getContext().getELFSection(".symtab", ELF::SHT_SYMTAB, 1356c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola 0, 13573f2d13c98eb04962bf6fcfdcc6f62789bc820d79Rafael Espindola SectionKind::getReadOnly()); 1358c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola sh_link = SectionIndexMap.lookup(SymtabSection); 1359c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola assert(sh_link && ".symtab not found"); 1360c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola 1361c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola // Remove ".rel" and ".rela" prefixes. 1362c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola unsigned SecNameLen = (Section.getType() == ELF::SHT_REL) ? 4 : 5; 1363c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola StringRef SectionName = Section.getSectionName().substr(SecNameLen); 1364c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola 1365c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola InfoSection = Asm.getContext().getELFSection(SectionName, 1366c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola ELF::SHT_PROGBITS, 0, 13673f2d13c98eb04962bf6fcfdcc6f62789bc820d79Rafael Espindola SectionKind::getReadOnly()); 1368c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola sh_info = SectionIndexMap.lookup(InfoSection); 1369c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola break; 1370c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola } 1371c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola 1372c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola case ELF::SHT_SYMTAB: 1373c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola case ELF::SHT_DYNSYM: 1374c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola sh_link = StringTableIndex; 1375c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola sh_info = LastLocalSymbolIndex; 1376c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola break; 1377c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola 1378c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola case ELF::SHT_SYMTAB_SHNDX: 1379c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola sh_link = SymbolTableIndex; 1380c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola break; 1381c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola 1382c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola case ELF::SHT_PROGBITS: 1383c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola case ELF::SHT_STRTAB: 1384c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola case ELF::SHT_NOBITS: 1385c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola case ELF::SHT_NULL: 1386c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola case ELF::SHT_ARM_ATTRIBUTES: 1387c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola // Nothing to do. 1388c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola break; 1389c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola 13902ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola case ELF::SHT_GROUP: { 13912ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola sh_link = SymbolTableIndex; 13922ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola sh_info = GroupSymbolIndex; 13932ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola break; 13942ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola } 13952ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola 1396c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola default: 1397c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola assert(0 && "FIXME: sh_type value not supported!"); 1398c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola break; 1399c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola } 1400c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola 1401c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola WriteSecHdrEntry(SectionStringTableIndex[&Section], Section.getType(), 1402c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola Section.getFlags(), 0, Offset, Size, sh_link, sh_info, 1403c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola Alignment, Section.getEntrySize()); 1404c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola} 1405c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola 1406115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbarvoid ELFObjectWriter::WriteObject(MCAssembler &Asm, 1407115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar const MCAsmLayout &Layout) { 14082ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola GroupMapTy GroupMap; 14091f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola RevGroupMapTy RevGroupMap; 14101f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola CreateGroupSections(Asm, const_cast<MCAsmLayout&>(Layout), GroupMap, 14111f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola RevGroupMap); 14122ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola 1413bab2a80525956b03b5f9126e1496785493326c37Rafael Espindola SectionIndexMapTy SectionIndexMap; 1414bab2a80525956b03b5f9126e1496785493326c37Rafael Espindola 1415bab2a80525956b03b5f9126e1496785493326c37Rafael Espindola ComputeIndexMap(Asm, SectionIndexMap); 1416bab2a80525956b03b5f9126e1496785493326c37Rafael Espindola 14178f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola // Compute symbol table information. 14181f4f9e3d35a2264d86f97dfb6d1e4ccb434f449bRafael Espindola ComputeSymbolTable(Asm, SectionIndexMap, RevGroupMap); 14198f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola 14203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming CreateMetadataSections(const_cast<MCAssembler&>(Asm), 14214beee3d06bfebe3f3382893fcebc71d1aa3f290eRafael Espindola const_cast<MCAsmLayout&>(Layout), 14224beee3d06bfebe3f3382893fcebc71d1aa3f290eRafael Espindola SectionIndexMap); 14233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 14241d739a010d49914eae7b6c415dd6de76ca142030Rafael Espindola // Update to include the metadata sections. 14251d739a010d49914eae7b6c415dd6de76ca142030Rafael Espindola ComputeIndexMap(Asm, SectionIndexMap); 14261d739a010d49914eae7b6c415dd6de76ca142030Rafael Espindola 14273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Add 1 for the null section. 14283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned NumSections = Asm.size() + 1; 1429a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t NaturalAlignment = Is64Bit ? 8 : 4; 1430a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t HeaderSize = Is64Bit ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr); 1431a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t FileOff = HeaderSize; 14323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 14332ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola std::vector<const MCSectionELF*> Sections; 14342ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola Sections.resize(NumSections); 14352ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola 14362ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola for (SectionIndexMapTy::const_iterator i= 14372ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola SectionIndexMap.begin(), e = SectionIndexMap.end(); i != e; ++i) { 14382ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola const std::pair<const MCSectionELF*, uint32_t> &p = *i; 14392ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola Sections[p.second] = p.first; 14402ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola } 14412ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola 14422ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola for (unsigned i = 1; i < NumSections; ++i) { 14432ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola const MCSectionELF &Section = *Sections[i]; 14442ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola const MCSectionData &SD = Asm.getOrCreateSectionData(Section); 14453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1446a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff = RoundUpToAlignment(FileOff, SD.getAlignment()); 1447a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 14483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Get the size of the section in the output file (including padding). 14493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Size = Layout.getSectionFileSize(&SD); 1450a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 1451a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff += Size; 14523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 14533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1454a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff = RoundUpToAlignment(FileOff, NaturalAlignment); 1455a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 14563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Write out the ELF header ... 1457a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer WriteHeader(FileOff - HeaderSize, NumSections); 1458a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 1459a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff = HeaderSize; 14603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 14613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ... then all of the sections ... 14623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming DenseMap<const MCSection*, uint64_t> SectionOffsetMap; 14633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 14642ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola for (unsigned i = 1; i < NumSections; ++i) { 14652ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola const MCSectionELF &Section = *Sections[i]; 14662ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola const MCSectionData &SD = Asm.getOrCreateSectionData(Section); 1467a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 1468a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t Padding = OffsetToAlignment(FileOff, SD.getAlignment()); 1469a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer WriteZeros(Padding); 1470a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff += Padding; 1471a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 14723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Remember the offset into the file for this section. 14732ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola SectionOffsetMap[&Section] = FileOff; 147444cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer 14753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming FileOff += Layout.getSectionFileSize(&SD); 14763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1477115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar Asm.WriteSectionData(&SD, Layout, this); 14783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 14793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1480a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t Padding = OffsetToAlignment(FileOff, NaturalAlignment); 1481a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer WriteZeros(Padding); 1482a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff += Padding; 1483a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 14843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ... and then the section header table. 14853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Should we align the section header table? 14863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 14873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Null section first. 14887be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola uint64_t FirstSectionSize = 14897be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola NumSections >= ELF::SHN_LORESERVE ? NumSections : 0; 14907be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola uint32_t FirstSectionLink = 14917be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola ShstrtabIndex >= ELF::SHN_LORESERVE ? ShstrtabIndex : 0; 14927be2c33193aeada8c0ff3555ea54b930f204132aRafael Espindola WriteSecHdrEntry(0, 0, 0, 0, 0, FirstSectionSize, FirstSectionLink, 0, 0, 0); 14933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 14942ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola for (unsigned i = 1; i < NumSections; ++i) { 14952ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola const MCSectionELF &Section = *Sections[i]; 14962ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola const MCSectionData &SD = Asm.getOrCreateSectionData(Section); 14972ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola uint32_t GroupSymbolIndex; 14982ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola if (Section.getType() != ELF::SHT_GROUP) 14992ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola GroupSymbolIndex = 0; 15002ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola else 15012ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola GroupSymbolIndex = getSymbolIndexInSymbolTable(Asm, GroupMap[&Section]); 15023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 15032ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola WriteSection(Asm, SectionIndexMap, GroupSymbolIndex, 15042ff9e83a826c1c2ee0f1c6072d3d97d5b10678eeRafael Espindola SectionOffsetMap[&Section], Layout.getSectionSize(&SD), 1505c87a94a94254f45220255938f14321b6ec35fcfeRafael Espindola SD.getAlignment(), Section); 15063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 15073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 15083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1509115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel DunbarMCObjectWriter *llvm::createELFObjectWriter(raw_ostream &OS, 1510115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar bool Is64Bit, 1511115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar Triple::OSType OSType, 1512115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar uint16_t EMachine, 1513115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar bool IsLittleEndian, 1514115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar bool HasRelocationAddend) { 1515115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar return new ELFObjectWriter(OS, Is64Bit, IsLittleEndian, EMachine, 1516115a3dd066c277c5417f4d9b9f642b732b76f4e7Daniel Dunbar HasRelocationAddend, OSType); 15173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 1518