ELFObjectWriter.cpp revision d179886f0595eb3564a9edfdfff79def130d89cc
13565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming//===- lib/MC/ELFObjectWriter.cpp - ELF File Writer -------------------===// 23565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// 33565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// The LLVM Compiler Infrastructure 43565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// 53565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// This file is distributed under the University of Illinois Open Source 63565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// License. See LICENSE.TXT for details. 73565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// 83565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming//===----------------------------------------------------------------------===// 93565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// 103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// This file implements ELF object file writer information. 113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// 123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming//===----------------------------------------------------------------------===// 133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/ELFObjectWriter.h" 158f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola#include "llvm/ADT/SmallPtrSet.h" 163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/ADT/STLExtras.h" 173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/ADT/StringMap.h" 183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/ADT/Twine.h" 193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCAssembler.h" 203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCAsmLayout.h" 213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCContext.h" 223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCELFSymbolFlags.h" 233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCExpr.h" 243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCObjectWriter.h" 253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCSectionELF.h" 263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCSymbol.h" 273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCValue.h" 283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/Support/Debug.h" 293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/Support/ErrorHandling.h" 303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/Support/ELF.h" 313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/Target/TargetAsmBackend.h" 323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "../Target/X86/X86FixupKinds.h" 343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include <vector> 363565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingusing namespace llvm; 373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 38ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindolastatic unsigned GetType(const MCSymbolData &SD) { 39ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola uint32_t Type = (SD.getFlags() & (0xf << ELF_STT_Shift)) >> ELF_STT_Shift; 40ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola assert(Type == ELF::STT_NOTYPE || Type == ELF::STT_OBJECT || 41ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola Type == ELF::STT_FUNC || Type == ELF::STT_SECTION || 42ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola Type == ELF::STT_FILE || Type == ELF::STT_COMMON || 43ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola Type == ELF::STT_TLS); 44ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola return Type; 45ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola} 46ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola 47e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindolastatic unsigned GetBinding(const MCSymbolData &SD) { 48e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola uint32_t Binding = (SD.getFlags() & (0xf << ELF_STB_Shift)) >> ELF_STB_Shift; 49e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola assert(Binding == ELF::STB_LOCAL || Binding == ELF::STB_GLOBAL || 50e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola Binding == ELF::STB_WEAK); 51e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola return Binding; 52e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola} 53e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola 54e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindolastatic void SetBinding(MCSymbolData &SD, unsigned Binding) { 55e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola assert(Binding == ELF::STB_LOCAL || Binding == ELF::STB_GLOBAL || 56e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola Binding == ELF::STB_WEAK); 57e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola uint32_t OtherFlags = SD.getFlags() & ~(0xf << ELF_STB_Shift); 58e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola SD.setFlags(OtherFlags | (Binding << ELF_STB_Shift)); 59e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola} 60e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola 61152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindolastatic unsigned GetVisibility(MCSymbolData &SD) { 62152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola unsigned Visibility = 63152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola (SD.getFlags() & (0xf << ELF_STV_Shift)) >> ELF_STV_Shift; 64152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola assert(Visibility == ELF::STV_DEFAULT || Visibility == ELF::STV_INTERNAL || 65152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola Visibility == ELF::STV_HIDDEN || Visibility == ELF::STV_PROTECTED); 66152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola return Visibility; 67152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola} 68152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola 69cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindolastatic bool isFixupKindX86PCRel(unsigned Kind) { 70cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola switch (Kind) { 71cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola default: 72cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola return false; 73cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola case X86::reloc_pcrel_1byte: 74cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola case X86::reloc_pcrel_4byte: 75cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola case X86::reloc_riprel_4byte: 76cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola case X86::reloc_riprel_4byte_movq_load: 77cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola return true; 78cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola } 79cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola} 80cebdc01d66c55a4e8c260ad182d6816f2bcd0c44Rafael Espindola 81a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindolastatic bool RelocNeedsGOT(MCSymbolRefExpr::VariantKind Variant) { 82a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola switch (Variant) { 835c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola default: 845c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola return false; 85a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_GOT: 86a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_PLT: 87a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_GOTPCREL: 88a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_TPOFF: 89a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_TLSGD: 90a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_GOTTPOFF: 91a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_INDNTPOFF: 92a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_NTPOFF: 93a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_GOTNTPOFF: 94a264f72d3fb9dec1427480fcf17ef3c746ea723aRafael Espindola case MCSymbolRefExpr::VK_TLSLDM: 950cf15d61b7e3bf53f5a99f58ada37b93bc039559Rafael Espindola case MCSymbolRefExpr::VK_DTPOFF: 96b4d1721eff7b43577e5f2e53f885973fb6c43683Rafael Espindola case MCSymbolRefExpr::VK_TLSLD: 975c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola return true; 985c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola } 995c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola} 1005c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola 1013565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingnamespace { 1023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming class ELFObjectWriterImpl { 104b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner /*static bool isFixupKindX86RIPRel(unsigned Kind) { 1053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming return Kind == X86::reloc_riprel_4byte || 1063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Kind == X86::reloc_riprel_4byte_movq_load; 107b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner }*/ 1083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// ELFSymbolData - Helper struct for containing some precomputed information 1113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// on symbols. 1123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming struct ELFSymbolData { 1133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData *SymbolData; 1143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t StringIndex; 1153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint32_t SectionIndex; 1163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Support lexicographic sorting. 1183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool operator<(const ELFSymbolData &RHS) const { 119ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola if (GetType(*SymbolData) == ELF::STT_FILE) 120ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola return true; 121ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola if (GetType(*RHS.SymbolData) == ELF::STT_FILE) 122ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola return false; 12336c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer return SymbolData->getSymbol().getName() < 12436c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer RHS.SymbolData->getSymbol().getName(); 1253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming }; 1273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @name Relocation Data 1293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @{ 1303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming struct ELFRelocationEntry { 1323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Make these big enough for both 32-bit and 64-bit 1333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t r_offset; 1348f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola int Index; 1358f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola unsigned Type; 1368f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola const MCSymbol *Symbol; 1373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t r_addend; 1383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Support lexicographic sorting. 1403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool operator<(const ELFRelocationEntry &RE) const { 1413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming return RE.r_offset < r_offset; 1423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming }; 1443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1458f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola SmallPtrSet<const MCSymbol *, 16> UsedInReloc; 14688182132470527e27231f09b25a885893e528c66Rafael Espindola DenseMap<const MCSymbol *, const MCSymbol *> Renames; 1478f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola 1483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming llvm::DenseMap<const MCSectionData*, 1493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFRelocationEntry> > Relocations; 1503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming DenseMap<const MCSection*, uint64_t> SectionStringTableIndex; 1513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @} 1533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @name Symbol Table Data 1543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @{ 1553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SmallString<256> StringTable; 1573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFSymbolData> LocalSymbolData; 1583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFSymbolData> ExternalSymbolData; 1593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFSymbolData> UndefinedSymbolData; 1603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @} 1623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1638f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola int NumRegularSections; 1648f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola 1655c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola bool NeedsGOT; 1665c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola 1673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFObjectWriter *Writer; 1683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming raw_ostream &OS; 1703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned Is64Bit : 1; 1723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool HasRelocationAddend; 1743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1755baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky Triple::OSType OSType; 1765baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky 177eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck uint16_t EMachine; 178eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck 1793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // This holds the symbol table index of the last local symbol. 1803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned LastLocalSymbolIndex; 1813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // This holds the .strtab section index. 1823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned StringTableIndex; 1833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned ShstrtabIndex; 1853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming public: 1873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFObjectWriterImpl(ELFObjectWriter *_Writer, bool _Is64Bit, 188eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck uint16_t _EMachine, bool _HasRelAddend, 189eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck Triple::OSType _OSType) 1905c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola : NeedsGOT(false), Writer(_Writer), OS(Writer->getStream()), 1915baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky Is64Bit(_Is64Bit), HasRelocationAddend(_HasRelAddend), 192eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck OSType(_OSType), EMachine(_EMachine) { 1933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void Write8(uint8_t Value) { Writer->Write8(Value); } 1963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void Write16(uint16_t Value) { Writer->Write16(Value); } 1973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void Write32(uint32_t Value) { Writer->Write32(Value); } 198b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner //void Write64(uint64_t Value) { Writer->Write64(Value); } 1993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteZeros(unsigned N) { Writer->WriteZeros(N); } 200b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner //void WriteBytes(StringRef Str, unsigned ZeroFillSize = 0) { 201b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner // Writer->WriteBytes(Str, ZeroFillSize); 202b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner //} 2033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteWord(uint64_t W) { 205b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner if (Is64Bit) 2063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Writer->Write64(W); 207b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner else 2083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Writer->Write32(W); 2093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void String8(char *buf, uint8_t Value) { 2123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[0] = Value; 2133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringLE16(char *buf, uint16_t Value) { 2163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[0] = char(Value >> 0); 2173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[1] = char(Value >> 8); 2183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringLE32(char *buf, uint32_t Value) { 22136c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer StringLE16(buf, uint16_t(Value >> 0)); 222c522f6e70b02d161e4bf37023edb20643ee34acfBenjamin Kramer StringLE16(buf + 2, uint16_t(Value >> 16)); 2233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringLE64(char *buf, uint64_t Value) { 22636c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer StringLE32(buf, uint32_t(Value >> 0)); 227c522f6e70b02d161e4bf37023edb20643ee34acfBenjamin Kramer StringLE32(buf + 4, uint32_t(Value >> 32)); 2283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringBE16(char *buf ,uint16_t Value) { 2313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[0] = char(Value >> 8); 2323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[1] = char(Value >> 0); 2333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringBE32(char *buf, uint32_t Value) { 23636c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer StringBE16(buf, uint16_t(Value >> 16)); 237c522f6e70b02d161e4bf37023edb20643ee34acfBenjamin Kramer StringBE16(buf + 2, uint16_t(Value >> 0)); 2383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringBE64(char *buf, uint64_t Value) { 24136c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer StringBE32(buf, uint32_t(Value >> 32)); 242c522f6e70b02d161e4bf37023edb20643ee34acfBenjamin Kramer StringBE32(buf + 4, uint32_t(Value >> 0)); 2433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void String16(char *buf, uint16_t Value) { 2463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Writer->isLittleEndian()) 247f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringLE16(buf, Value); 2483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming else 249f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringBE16(buf, Value); 2503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void String32(char *buf, uint32_t Value) { 2533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Writer->isLittleEndian()) 254f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringLE32(buf, Value); 2553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming else 256f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringBE32(buf, Value); 2573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void String64(char *buf, uint64_t Value) { 2603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Writer->isLittleEndian()) 261f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringLE64(buf, Value); 2623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming else 263f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringBE64(buf, Value); 2643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteHeader(uint64_t SectionDataSize, unsigned NumberOfSections); 2673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteSymbolEntry(MCDataFragment *F, uint64_t name, uint8_t info, 2693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t value, uint64_t size, 2703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint8_t other, uint16_t shndx); 2713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteSymbol(MCDataFragment *F, ELFSymbolData &MSD, 2733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout); 2743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteSymbolTable(MCDataFragment *F, const MCAssembler &Asm, 27671859c640f6a36251aca223fd503c58dc314e296Rafael Espindola const MCAsmLayout &Layout, 27771859c640f6a36251aca223fd503c58dc314e296Rafael Espindola unsigned NumRegularSections); 2783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void RecordRelocation(const MCAssembler &Asm, const MCAsmLayout &Layout, 2803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFragment *Fragment, const MCFixup &Fixup, 2813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCValue Target, uint64_t &FixedValue); 2823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2830b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin Kramer uint64_t getSymbolIndexInSymbolTable(const MCAssembler &Asm, 2840b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin Kramer const MCSymbol *S); 2853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// ComputeSymbolTable - Compute the symbol table data 2873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// 2883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// \param StringTable [out] - The string table data. 2893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// \param StringIndexMap [out] - Map from symbol names to offsets in the 2903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// string table. 2913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void ComputeSymbolTable(MCAssembler &Asm); 2923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout, 2943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData &SD); 2953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteRelocations(MCAssembler &Asm, MCAsmLayout &Layout) { 2973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 2983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 2993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteRelocation(Asm, Layout, *it); 3003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 3013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 3023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void CreateMetadataSections(MCAssembler &Asm, MCAsmLayout &Layout); 3043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 30588182132470527e27231f09b25a885893e528c66Rafael Espindola void ExecutePostLayoutBinding(MCAssembler &Asm); 3063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteSecHdrEntry(uint32_t Name, uint32_t Type, uint64_t Flags, 3083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Address, uint64_t Offset, 3093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Size, uint32_t Link, uint32_t Info, 3103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Alignment, uint64_t EntrySize); 3113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteRelocationsFragment(const MCAssembler &Asm, MCDataFragment *F, 3133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData *SD); 3143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3157070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola bool IsFixupFullyResolved(const MCAssembler &Asm, 3167070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCValue Target, 3177070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola bool IsPCRel, 3187070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCFragment *DF) const; 3197070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 3208f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola void WriteObject(MCAssembler &Asm, const MCAsmLayout &Layout); 3213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming }; 3223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 3243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// Emit the ELF header. 3263565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteHeader(uint64_t SectionDataSize, 3273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned NumberOfSections) { 3283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ELF Header 3293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ---------- 3303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 3313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Note 3323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ---- 3333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // emitWord method behaves differently for ELF32 and ELF64, writing 3343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 4 bytes in the former and 8 in the latter. 3353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(0x7f); // e_ident[EI_MAG0] 3373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8('E'); // e_ident[EI_MAG1] 3383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8('L'); // e_ident[EI_MAG2] 3393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8('F'); // e_ident[EI_MAG3] 3403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(Is64Bit ? ELF::ELFCLASS64 : ELF::ELFCLASS32); // e_ident[EI_CLASS] 3423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_ident[EI_DATA] 3443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(Writer->isLittleEndian() ? ELF::ELFDATA2LSB : ELF::ELFDATA2MSB); 3453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(ELF::EV_CURRENT); // e_ident[EI_VERSION] 3475baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky // e_ident[EI_OSABI] 3485baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky switch (OSType) { 3495baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky case Triple::FreeBSD: Write8(ELF::ELFOSABI_FREEBSD); break; 3505baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky case Triple::Linux: Write8(ELF::ELFOSABI_LINUX); break; 3515baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky default: Write8(ELF::ELFOSABI_NONE); break; 3525baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky } 3533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(0); // e_ident[EI_ABIVERSION] 3543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteZeros(ELF::EI_NIDENT - ELF::EI_PAD); 3563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(ELF::ET_REL); // e_type 3583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 359eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck Write16(EMachine); // e_machine = target 3603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(ELF::EV_CURRENT); // e_version 3623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(0); // e_entry, no entry point in .o file 3633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(0); // e_phoff, no program header for .o 364eb97677764beb115c658ac559d3649c6c4068eb9Benjamin Kramer WriteWord(SectionDataSize + (Is64Bit ? sizeof(ELF::Elf64_Ehdr) : 365eb97677764beb115c658ac559d3649c6c4068eb9Benjamin Kramer sizeof(ELF::Elf32_Ehdr))); // e_shoff = sec hdr table off in bytes 3663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // FIXME: Make this configurable. 3683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(0); // e_flags = whatever the target wants 3693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_ehsize = ELF header size 3713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(Is64Bit ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr)); 3723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(0); // e_phentsize = prog header entry size 3743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(0); // e_phnum = # prog header entries = 0 3753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_shentsize = Section header entry size 3773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(Is64Bit ? sizeof(ELF::Elf64_Shdr) : sizeof(ELF::Elf32_Shdr)); 3783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_shnum = # of section header ents 3803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(NumberOfSections); 3813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_shstrndx = Section # of '.shstrtab' 3833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(ShstrtabIndex); 3843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 3853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3863565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteSymbolEntry(MCDataFragment *F, uint64_t name, 3873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint8_t info, uint64_t value, 3883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t size, uint8_t other, 3893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint16_t shndx) { 3903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Is64Bit) { 3913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming char buf[8]; 3923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String32(buf, name); 3943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 4); // st_name 3953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String8(buf, info); 3973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 1); // st_info 398368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer 3993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String8(buf, other); 4003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 1); // st_other 4013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String16(buf, shndx); 4033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 2); // st_shndx 4043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String64(buf, value); 4063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 8); // st_value 4073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String64(buf, size); 4093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 8); // st_size 4103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 4113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming char buf[4]; 4123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String32(buf, name); 4143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 4); // st_name 4153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String32(buf, value); 4173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 4); // st_value 4183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String32(buf, size); 4203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 4); // st_size 4213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String8(buf, info); 4233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 1); // st_info 4243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String8(buf, other); 4263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 1); // st_other 4273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String16(buf, shndx); 4293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 2); // st_shndx 4303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 4313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 4323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4332c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindolastatic uint64_t SymbolValue(MCSymbolData &Data, const MCAsmLayout &Layout) { 4342c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola if (Data.isCommon() && Data.isExternal()) 4352c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola return Data.getCommonAlignment(); 4362c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola 4372c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola const MCSymbol &Symbol = Data.getSymbol(); 4382c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola if (!Symbol.isInSection()) 4392c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola return 0; 4402c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola 4411973d4379250a88938a9358c12d96e96bdc8dedeRafael Espindola if (MCFragment *FF = Data.getFragment()) 4421973d4379250a88938a9358c12d96e96bdc8dedeRafael Espindola return Layout.getSymbolAddress(&Data) - 4431973d4379250a88938a9358c12d96e96bdc8dedeRafael Espindola Layout.getSectionAddress(FF->getParent()); 4442c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola 4452c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola return 0; 4462c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola} 4472c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola 448de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindolastatic const MCSymbol &AliasedSymbol(const MCSymbol &Symbol) { 449de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola const MCSymbol *S = &Symbol; 450de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola while (S->isVariable()) { 451de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola const MCExpr *Value = S->getVariableValue(); 452a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola if (Value->getKind() != MCExpr::SymbolRef) 453a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola return *S; 454152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola const MCSymbolRefExpr *Ref = static_cast<const MCSymbolRefExpr*>(Value); 455de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola S = &Ref->getSymbol(); 456152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola } 457de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola return *S; 458de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola} 459de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola 46088182132470527e27231f09b25a885893e528c66Rafael Espindolavoid ELFObjectWriterImpl::ExecutePostLayoutBinding(MCAssembler &Asm) { 46188182132470527e27231f09b25a885893e528c66Rafael Espindola // The presence of symbol versions causes undefined symbols and 46288182132470527e27231f09b25a885893e528c66Rafael Espindola // versions declared with @@@ to be renamed. 46388182132470527e27231f09b25a885893e528c66Rafael Espindola 46488182132470527e27231f09b25a885893e528c66Rafael Espindola for (MCAssembler::symbol_iterator it = Asm.symbol_begin(), 46588182132470527e27231f09b25a885893e528c66Rafael Espindola ie = Asm.symbol_end(); it != ie; ++it) { 46688182132470527e27231f09b25a885893e528c66Rafael Espindola const MCSymbol &Alias = it->getSymbol(); 46788182132470527e27231f09b25a885893e528c66Rafael Espindola const MCSymbol &Symbol = AliasedSymbol(Alias); 468f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola MCSymbolData &SD = Asm.getSymbolData(Symbol); 469f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola 470f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola // Undefined symbols are global, but this is the first place we 471f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola // are able to set it. 472f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola if (Symbol.isUndefined() && !Symbol.isVariable()) { 473f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola if (GetBinding(SD) == ELF::STB_LOCAL) { 474f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola SetBinding(SD, ELF::STB_GLOBAL); 475f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola SetBinding(*it, ELF::STB_GLOBAL); 476f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola } 477f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola } 478f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola 479f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola // Not an alias. 480f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola if (&Symbol == &Alias) 481f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola continue; 482f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola 48307ee63283cc2b9a4d6c98ecd30d1b721fe3cb29aBenjamin Kramer StringRef AliasName = Alias.getName(); 48488182132470527e27231f09b25a885893e528c66Rafael Espindola size_t Pos = AliasName.find('@'); 48588182132470527e27231f09b25a885893e528c66Rafael Espindola if (Pos == StringRef::npos) 48688182132470527e27231f09b25a885893e528c66Rafael Espindola continue; 48788182132470527e27231f09b25a885893e528c66Rafael Espindola 488f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola // Aliases defined with .symvar copy the binding from the symbol they alias. 489f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola // This is the first place we are able to copy this information. 490f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola it->setExternal(SD.isExternal()); 491f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola SetBinding(*it, GetBinding(SD)); 492f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola 49307ee63283cc2b9a4d6c98ecd30d1b721fe3cb29aBenjamin Kramer StringRef Rest = AliasName.substr(Pos); 49488182132470527e27231f09b25a885893e528c66Rafael Espindola if (!Symbol.isUndefined() && !Rest.startswith("@@@")) 49588182132470527e27231f09b25a885893e528c66Rafael Espindola continue; 49688182132470527e27231f09b25a885893e528c66Rafael Espindola 49783ff4d2b0d6133d48055a27fe25c5d241bca7e9bRafael Espindola // FIXME: produce a better error message. 49883ff4d2b0d6133d48055a27fe25c5d241bca7e9bRafael Espindola if (Symbol.isUndefined() && Rest.startswith("@@") && 49983ff4d2b0d6133d48055a27fe25c5d241bca7e9bRafael Espindola !Rest.startswith("@@@")) 50083ff4d2b0d6133d48055a27fe25c5d241bca7e9bRafael Espindola report_fatal_error("A @@ version cannot be undefined"); 50183ff4d2b0d6133d48055a27fe25c5d241bca7e9bRafael Espindola 50207ee63283cc2b9a4d6c98ecd30d1b721fe3cb29aBenjamin Kramer Renames.insert(std::make_pair(&Symbol, &Alias)); 50388182132470527e27231f09b25a885893e528c66Rafael Espindola } 50488182132470527e27231f09b25a885893e528c66Rafael Espindola} 50588182132470527e27231f09b25a885893e528c66Rafael Espindola 506de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindolavoid ELFObjectWriterImpl::WriteSymbol(MCDataFragment *F, ELFSymbolData &MSD, 507de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola const MCAsmLayout &Layout) { 508de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola MCSymbolData &OrigData = *MSD.SymbolData; 509de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola MCSymbolData &Data = 510de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola Layout.getAssembler().getSymbolData(AliasedSymbol(OrigData.getSymbol())); 511152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola 512152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Binding = GetBinding(OrigData); 513152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Visibility = GetVisibility(OrigData); 514152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Type = GetType(Data); 515152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola 516152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Info = (Binding << ELF_STB_Shift) | (Type << ELF_STT_Shift); 517152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Other = Visibility; 518152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola 5192c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola uint64_t Value = SymbolValue(Data, Layout); 5203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Size = 0; 5213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCExpr *ESize; 5223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 523f7c10a3cff61c70efe8e405d9bdc5386e8e3fc0aRafael Espindola assert(!(Data.isCommon() && !Data.isExternal())); 524f7c10a3cff61c70efe8e405d9bdc5386e8e3fc0aRafael Espindola 5253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ESize = Data.getSize(); 5263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Data.getSize()) { 5273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCValue Res; 5283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (ESize->getKind() == MCExpr::Binary) { 5293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(ESize); 5303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (BE->EvaluateAsRelocatable(Res, &Layout)) { 53224f1206c7de0f21d309d27737071ad742d5ddf27Benjamin Kramer assert(!Res.getSymA() || !Res.getSymA()->getSymbol().isDefined()); 53324f1206c7de0f21d309d27737071ad742d5ddf27Benjamin Kramer assert(!Res.getSymB() || !Res.getSymB()->getSymbol().isDefined()); 534f230df9af4012f9510de664b6d62b128e26a5861Rafael Espindola Size = Res.getConstant(); 5353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else if (ESize->getKind() == MCExpr::Constant) { 537368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer Size = static_cast<const MCConstantExpr *>(ESize)->getValue(); 5383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 5393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(0 && "Unsupported size expression"); 5403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Write out the symbol table entry 5443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSymbolEntry(F, MSD.StringIndex, Info, Value, 5453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Size, Other, MSD.SectionIndex); 5463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 5473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5483565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteSymbolTable(MCDataFragment *F, 5493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAssembler &Asm, 55071859c640f6a36251aca223fd503c58dc314e296Rafael Espindola const MCAsmLayout &Layout, 55171859c640f6a36251aca223fd503c58dc314e296Rafael Espindola unsigned NumRegularSections) { 5523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // The string table must be emitted first because we need the index 5533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // into the string table for all the symbol names. 5543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(StringTable.size() && "Missing string table"); 5553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // FIXME: Make sure the start of the symbol table is aligned. 5573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // The first entry is the undefined symbol entry. 5593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned EntrySize = Is64Bit ? ELF::SYMENTRY_SIZE64 : ELF::SYMENTRY_SIZE32; 560368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer F->getContents().append(EntrySize, '\x00'); 5613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Write the symbol table entries. 5633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LastLocalSymbolIndex = LocalSymbolData.size() + 1; 5643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = LocalSymbolData.size(); i != e; ++i) { 5653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData &MSD = LocalSymbolData[i]; 5663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSymbol(F, MSD, Layout); 5673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 56971859c640f6a36251aca223fd503c58dc314e296Rafael Espindola // Write out a symbol table entry for each regular section. 570a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman unsigned Index = 1; 57171859c640f6a36251aca223fd503c58dc314e296Rafael Espindola for (MCAssembler::const_iterator it = Asm.begin(); 57271859c640f6a36251aca223fd503c58dc314e296Rafael Espindola Index <= NumRegularSections; ++it, ++Index) { 573a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman const MCSectionELF &Section = 574368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer static_cast<const MCSectionELF&>(it->getSection()); 575a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman // Leave out relocations so we don't have indexes within 576a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman // the relocations messed up 577377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer if (Section.getType() == ELF::SHT_RELA || Section.getType() == ELF::SHT_REL) 578a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman continue; 5793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSymbolEntry(F, 0, ELF::STT_SECTION, 0, 0, ELF::STV_DEFAULT, Index); 580a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman LastLocalSymbolIndex++; 581a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman } 5823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = ExternalSymbolData.size(); i != e; ++i) { 5843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData &MSD = ExternalSymbolData[i]; 5853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData &Data = *MSD.SymbolData; 5863223f19ff0920ffee686faba3bf74babf580e8a5Rafael Espindola assert(((Data.getFlags() & ELF_STB_Global) || 5873223f19ff0920ffee686faba3bf74babf580e8a5Rafael Espindola (Data.getFlags() & ELF_STB_Weak)) && 5883223f19ff0920ffee686faba3bf74babf580e8a5Rafael Espindola "External symbol requires STB_GLOBAL or STB_WEAK flag"); 5893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSymbol(F, MSD, Layout); 590e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola if (GetBinding(Data) == ELF::STB_LOCAL) 5913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LastLocalSymbolIndex++; 5923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i) { 5953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData &MSD = UndefinedSymbolData[i]; 5963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData &Data = *MSD.SymbolData; 5973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSymbol(F, MSD, Layout); 598e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola if (GetBinding(Data) == ELF::STB_LOCAL) 5993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LastLocalSymbolIndex++; 6003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 6013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 6023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6037eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindolastatic bool ShouldRelocOnSymbol(const MCSymbolData &SD, 6043729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola const MCValue &Target, 6053729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola const MCFragment &F) { 6067eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola const MCSymbol &Symbol = SD.getSymbol(); 6077eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola if (Symbol.isUndefined()) 6087eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola return true; 6097eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola 6107eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola const MCSectionELF &Section = 6117eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola static_cast<const MCSectionELF&>(Symbol.getSection()); 6127eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola 6137eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola if (SD.isExternal()) 6147eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola return true; 6157eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola 6168cecf253e45f144b9a7fd0ace85eeeeb0bebfc83Rafael Espindola MCSymbolRefExpr::VariantKind Kind = Target.getSymA()->getKind(); 6173729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola const MCSectionELF &Sec2 = 6183729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola static_cast<const MCSectionELF&>(F.getParent()->getSection()); 6193729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola 620ce2d3c57758619e99a99104e1168a9558658fab0Rafael Espindola if (Section.getKind().isBSS()) 621ce2d3c57758619e99a99104e1168a9558658fab0Rafael Espindola return false; 622ce2d3c57758619e99a99104e1168a9558658fab0Rafael Espindola 6238cecf253e45f144b9a7fd0ace85eeeeb0bebfc83Rafael Espindola if (&Sec2 != &Section && 624c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola (Kind == MCSymbolRefExpr::VK_PLT || 625c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola Kind == MCSymbolRefExpr::VK_GOTPCREL || 626c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola Kind == MCSymbolRefExpr::VK_GOTOFF)) 6273729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola return true; 6283729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola 629c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola if (Section.getFlags() & MCSectionELF::SHF_MERGE) 630c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola return Target.getConstant() != 0; 631c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola 6327eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola return false; 63373ffea47d20bc9f559b4ce0c60166ee504073832Rafael Espindola} 63473ffea47d20bc9f559b4ce0c60166ee504073832Rafael Espindola 635e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer// FIXME: this is currently X86/X86_64 only 6363565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::RecordRelocation(const MCAssembler &Asm, 6373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout, 6383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFragment *Fragment, 6393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFixup &Fixup, 6403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCValue Target, 6413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t &FixedValue) { 6423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming int64_t Addend = 0; 6438f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola int Index = 0; 64495c602ade3aa30de17abd53b85968a3feb8fdfbcBenjamin Kramer int64_t Value = Target.getConstant(); 6458f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola const MCSymbol *Symbol = 0; 64629129728f1d4febe44792d1481077cc47fe83a08Rafael Espindola const MCSymbol *Renamed = 0; 6473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6480007489312ecb1b51ae275f1e452786480151a4cRafael Espindola bool IsPCRel = isFixupKindX86PCRel(Fixup.getKind()); 64981cfb8529b7fd1e98fefb79fb46b10301b93ab75Benjamin Kramer if (!Target.isAbsolute()) { 650de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola Symbol = &AliasedSymbol(Target.getSymA()->getSymbol()); 65129129728f1d4febe44792d1481077cc47fe83a08Rafael Espindola Renamed = Renames.lookup(Symbol); 65229129728f1d4febe44792d1481077cc47fe83a08Rafael Espindola if (!Renamed) 65329129728f1d4febe44792d1481077cc47fe83a08Rafael Espindola Renamed = Symbol; 6543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData &SD = Asm.getSymbolData(*Symbol); 65563d37b932278724d51e7f8bd1f2574c7b45f85f0Benjamin Kramer MCFragment *F = SD.getFragment(); 6563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6579d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola if (const MCSymbolRefExpr *RefB = Target.getSymB()) { 6589d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola const MCSymbol &SymbolB = RefB->getSymbol(); 6599d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola MCSymbolData &SDB = Asm.getSymbolData(SymbolB); 6609d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola IsPCRel = true; 66155fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola MCSectionData *Sec = Fragment->getParent(); 66255fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola 66355fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola // Offset of the symbol in the section 66455fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola int64_t a = Layout.getSymbolAddress(&SDB) - Layout.getSectionAddress(Sec); 66555fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola 66655fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola // Ofeset of the relocation in the section 66755fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola int64_t b = Layout.getFragmentOffset(Fragment) + Fixup.getOffset(); 66855fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola Value += b - a; 6699d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola } 6709d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola 6717eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola // Check that this case has already been fully resolved before we get 6727eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola // here. 6730007489312ecb1b51ae275f1e452786480151a4cRafael Espindola if (Symbol->isDefined() && !SD.isExternal() && 6740007489312ecb1b51ae275f1e452786480151a4cRafael Espindola IsPCRel && 6750007489312ecb1b51ae275f1e452786480151a4cRafael Espindola &Fragment->getParent()->getSection() == &Symbol->getSection()) { 6767eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola llvm_unreachable("We don't need a relocation in this case."); 6770007489312ecb1b51ae275f1e452786480151a4cRafael Espindola return; 6780007489312ecb1b51ae275f1e452786480151a4cRafael Espindola } 6790007489312ecb1b51ae275f1e452786480151a4cRafael Espindola 6803729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola bool RelocOnSymbol = ShouldRelocOnSymbol(SD, Target, *Fragment); 6817eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola if (!RelocOnSymbol) { 6828f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola Index = F->getParent()->getOrdinal(); 6837eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola 6847eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola MCSectionData *FSD = F->getParent(); 6857eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola // Offset of the symbol in the section 6867eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola Value += Layout.getSymbolAddress(&SD) - Layout.getSectionAddress(FSD); 6878f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola } else { 68829129728f1d4febe44792d1481077cc47fe83a08Rafael Espindola UsedInReloc.insert(Renamed); 6898f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola Index = -1; 6908f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola } 6917eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola Addend = Value; 6927eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola // Compensate for the addend on i386. 6937eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola if (Is64Bit) 6947eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola Value = 0; 6953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 6963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 69795c602ade3aa30de17abd53b85968a3feb8fdfbcBenjamin Kramer FixedValue = Value; 69895c602ade3aa30de17abd53b85968a3feb8fdfbcBenjamin Kramer 6993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // determine the type of the relocation 70028f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola 70128f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola MCSymbolRefExpr::VariantKind Modifier = Target.getSymA()->getKind(); 70263d37b932278724d51e7f8bd1f2574c7b45f85f0Benjamin Kramer unsigned Type; 703e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer if (Is64Bit) { 704e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer if (IsPCRel) { 70592bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola switch (Modifier) { 7069edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola default: 7079edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola llvm_unreachable("Unimplemented"); 70892bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola case MCSymbolRefExpr::VK_None: 70992bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola Type = ELF::R_X86_64_PC32; 71092bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola break; 71192bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola case MCSymbolRefExpr::VK_PLT: 71292bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola Type = ELF::R_X86_64_PLT32; 71392bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola break; 714a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_GOTPCREL: 715607d1f6d3216b647c07965bafae8d1aba6312136Rafael Espindola Type = ELF::R_X86_64_GOTPCREL; 716607d1f6d3216b647c07965bafae8d1aba6312136Rafael Espindola break; 717bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola case MCSymbolRefExpr::VK_GOTTPOFF: 718bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola Type = ELF::R_X86_64_GOTTPOFF; 719bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola break; 720bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola case MCSymbolRefExpr::VK_TLSGD: 721bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola Type = ELF::R_X86_64_TLSGD; 722bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola break; 723b4d1721eff7b43577e5f2e53f885973fb6c43683Rafael Espindola case MCSymbolRefExpr::VK_TLSLD: 724b4d1721eff7b43577e5f2e53f885973fb6c43683Rafael Espindola Type = ELF::R_X86_64_TLSLD; 725b4d1721eff7b43577e5f2e53f885973fb6c43683Rafael Espindola break; 72692bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola } 727e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } else { 728e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer switch ((unsigned)Fixup.getKind()) { 729e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer default: llvm_unreachable("invalid fixup kind!"); 730e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_8: Type = ELF::R_X86_64_64; break; 731a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola case X86::reloc_signed_4byte: 732e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case X86::reloc_pcrel_4byte: 733a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola assert(isInt<32>(Target.getConstant())); 73428f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola switch (Modifier) { 7359edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola default: 7369edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola llvm_unreachable("Unimplemented"); 73728f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola case MCSymbolRefExpr::VK_None: 73828f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola Type = ELF::R_X86_64_32S; 73928f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola break; 74028f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola case MCSymbolRefExpr::VK_GOT: 74128f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola Type = ELF::R_X86_64_GOT32; 74228f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola break; 743c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola case MCSymbolRefExpr::VK_GOTPCREL: 7448cecf253e45f144b9a7fd0ace85eeeeb0bebfc83Rafael Espindola Type = ELF::R_X86_64_GOTPCREL; 7458cecf253e45f144b9a7fd0ace85eeeeb0bebfc83Rafael Espindola break; 746bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola case MCSymbolRefExpr::VK_TPOFF: 747bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola Type = ELF::R_X86_64_TPOFF32; 748bc82d8b84f6ae15985d1b01e720ed5c37d714012Rafael Espindola break; 749aa8f1f01352bdaaabf712369f8a8a615c776b508Rafael Espindola case MCSymbolRefExpr::VK_DTPOFF: 750aa8f1f01352bdaaabf712369f8a8a615c776b508Rafael Espindola Type = ELF::R_X86_64_DTPOFF32; 751aa8f1f01352bdaaabf712369f8a8a615c776b508Rafael Espindola break; 75228f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola } 753a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola break; 754e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_4: 755a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola Type = ELF::R_X86_64_32; 756e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer break; 757e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_2: Type = ELF::R_X86_64_16; break; 758e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case X86::reloc_pcrel_1byte: 759e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_1: Type = ELF::R_X86_64_8; break; 760e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } 761e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } 7623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 763e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer if (IsPCRel) { 7649edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola switch (Modifier) { 7659edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola default: 76624dc9ecdc55d732ac93fc782d6232413fe2c1160Rafael Espindola llvm_unreachable("Unimplemented"); 76724dc9ecdc55d732ac93fc782d6232413fe2c1160Rafael Espindola case MCSymbolRefExpr::VK_None: 7689baee3b3a3924bc45d007e54c71333739d135f8eRafael Espindola Type = ELF::R_386_PC32; 7699baee3b3a3924bc45d007e54c71333739d135f8eRafael Espindola break; 7709edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola case MCSymbolRefExpr::VK_PLT: 7719edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola Type = ELF::R_386_PLT32; 7729edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola break; 7739edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola } 774e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } else { 775e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer switch ((unsigned)Fixup.getKind()) { 776e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer default: llvm_unreachable("invalid fixup kind!"); 777a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola 77824ba4f7f5f27c8d64be7ad653863b33594e5f019Rafael Espindola case X86::reloc_global_offset_table: 77924ba4f7f5f27c8d64be7ad653863b33594e5f019Rafael Espindola Type = ELF::R_386_GOTPC; 78024ba4f7f5f27c8d64be7ad653863b33594e5f019Rafael Espindola break; 78124ba4f7f5f27c8d64be7ad653863b33594e5f019Rafael Espindola 782a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola // FIXME: Should we avoid selecting reloc_signed_4byte in 32 bit mode 783a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola // instead? 784a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola case X86::reloc_signed_4byte: 785e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case X86::reloc_pcrel_4byte: 786bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola case FK_Data_4: 787c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola switch (Modifier) { 7889edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola default: 7899edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola llvm_unreachable("Unimplemented"); 790bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola case MCSymbolRefExpr::VK_None: 79124ba4f7f5f27c8d64be7ad653863b33594e5f019Rafael Espindola Type = ELF::R_386_32; 792bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola break; 793eada30479399014c22c7b7edb008177c312eefeeRafael Espindola case MCSymbolRefExpr::VK_GOT: 794eada30479399014c22c7b7edb008177c312eefeeRafael Espindola Type = ELF::R_386_GOT32; 795eada30479399014c22c7b7edb008177c312eefeeRafael Espindola break; 796c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola case MCSymbolRefExpr::VK_GOTOFF: 797c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola Type = ELF::R_386_GOTOFF; 798c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola break; 7993cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola case MCSymbolRefExpr::VK_TLSGD: 8003cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola Type = ELF::R_386_TLS_GD; 8013cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola break; 8023cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola case MCSymbolRefExpr::VK_TPOFF: 8033cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola Type = ELF::R_386_TLS_LE_32; 8043cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola break; 8053cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola case MCSymbolRefExpr::VK_INDNTPOFF: 8063cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola Type = ELF::R_386_TLS_IE; 8073cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola break; 8083cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola case MCSymbolRefExpr::VK_NTPOFF: 8093cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola Type = ELF::R_386_TLS_LE; 8103cede2d0b2b6cc0a06f55da7c2f8e4263ec0091eRafael Espindola break; 811a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola case MCSymbolRefExpr::VK_GOTNTPOFF: 812a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola Type = ELF::R_386_TLS_GOTIE; 813a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola break; 814a264f72d3fb9dec1427480fcf17ef3c746ea723aRafael Espindola case MCSymbolRefExpr::VK_TLSLDM: 815a264f72d3fb9dec1427480fcf17ef3c746ea723aRafael Espindola Type = ELF::R_386_TLS_LDM; 816a264f72d3fb9dec1427480fcf17ef3c746ea723aRafael Espindola break; 8170cf15d61b7e3bf53f5a99f58ada37b93bc039559Rafael Espindola case MCSymbolRefExpr::VK_DTPOFF: 8180cf15d61b7e3bf53f5a99f58ada37b93bc039559Rafael Espindola Type = ELF::R_386_TLS_LDO_32; 8190cf15d61b7e3bf53f5a99f58ada37b93bc039559Rafael Espindola break; 820c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola } 821c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola break; 822e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_2: Type = ELF::R_386_16; break; 823e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case X86::reloc_pcrel_1byte: 824e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_1: Type = ELF::R_386_8; break; 825e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } 8263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 8273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 8283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 829a0a2f8734cdfc19d44201b791a969bcdda96bb70Rafael Espindola if (RelocNeedsGOT(Modifier)) 8305c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola NeedsGOT = true; 8315c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola 832e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer ELFRelocationEntry ERE; 833e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer 8348f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ERE.Index = Index; 8358f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ERE.Type = Type; 83629129728f1d4febe44792d1481077cc47fe83a08Rafael Espindola ERE.Symbol = Renamed; 8373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 83863d37b932278724d51e7f8bd1f2574c7b45f85f0Benjamin Kramer ERE.r_offset = Layout.getFragmentOffset(Fragment) + Fixup.getOffset(); 839e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer 8403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (HasRelocationAddend) 8413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ERE.r_addend = Addend; 842172d7d6a12b313dd5a8c1588b8f6bd49b1ce16b6Benjamin Kramer else 843172d7d6a12b313dd5a8c1588b8f6bd49b1ce16b6Benjamin Kramer ERE.r_addend = 0; // Silence compiler warning. 8443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Relocations[Fragment->getParent()].push_back(ERE); 8463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 8473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8480b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin Krameruint64_t 8490b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin KramerELFObjectWriterImpl::getSymbolIndexInSymbolTable(const MCAssembler &Asm, 8500b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin Kramer const MCSymbol *S) { 8517b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer MCSymbolData &SD = Asm.getSymbolData(*S); 8527b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer 8537b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer // Local symbol. 8547b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer if (!SD.isExternal() && !S->isUndefined()) 8557b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer return SD.getIndex() + /* empty symbol */ 1; 8567b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer 8577b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer // External or undefined symbol. 8588f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola return SD.getIndex() + NumRegularSections + /* empty symbol */ 1; 8593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 8603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 861737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindolastatic bool isInSymtab(const MCAssembler &Asm, const MCSymbolData &Data, 86288182132470527e27231f09b25a885893e528c66Rafael Espindola bool Used, bool Renamed) { 863bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola if (Used) 864bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola return true; 865bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola 86688182132470527e27231f09b25a885893e528c66Rafael Espindola if (Renamed) 86788182132470527e27231f09b25a885893e528c66Rafael Espindola return false; 86888182132470527e27231f09b25a885893e528c66Rafael Espindola 869737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola const MCSymbol &Symbol = Data.getSymbol(); 870a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola 871d179886f0595eb3564a9edfdfff79def130d89ccRafael Espindola if (Symbol.getName() == "_GLOBAL_OFFSET_TABLE_") 872d179886f0595eb3564a9edfdfff79def130d89ccRafael Espindola return true; 873d179886f0595eb3564a9edfdfff79def130d89ccRafael Espindola 874a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola const MCSymbol &A = AliasedSymbol(Symbol); 875d179886f0595eb3564a9edfdfff79def130d89ccRafael Espindola if (!A.isVariable() && A.isUndefined() && !Data.isCommon()) 876a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola return false; 877a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola 878737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola if (!Asm.isSymbolLinkerVisible(Symbol) && !Symbol.isUndefined()) 879737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return false; 880737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 881bd70118f163f94a4d77eb036e6f83dd0bfcb6268Rafael Espindola if (Symbol.isTemporary()) 882737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return false; 883737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 884737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return true; 885737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola} 886737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 887737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindolastatic bool isLocal(const MCSymbolData &Data) { 888737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola if (Data.isExternal()) 889737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return false; 890737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 891737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola const MCSymbol &Symbol = Data.getSymbol(); 892737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola if (Symbol.isUndefined() && !Symbol.isVariable()) 893737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return false; 894737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 895737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return true; 896737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola} 897737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 8983565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::ComputeSymbolTable(MCAssembler &Asm) { 8995c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola // FIXME: Is this the correct place to do this? 9005c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola if (NeedsGOT) { 9015c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola llvm::StringRef Name = "_GLOBAL_OFFSET_TABLE_"; 9025c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola MCSymbol *Sym = Asm.getContext().GetOrCreateSymbol(Name); 9035c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola MCSymbolData &Data = Asm.getOrCreateSymbolData(*Sym); 9045c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola Data.setExternal(true); 905f571f9a8fe764d5010970e45203415cb00eab739Rafael Espindola SetBinding(Data, ELF::STB_GLOBAL); 9065c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola } 9075c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola 9083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Build section lookup table. 9098f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola NumRegularSections = Asm.size(); 910f5c347dfc25e133e357c7086ad1b24edad4d2bc8Rafael Espindola DenseMap<const MCSection*, uint32_t> SectionIndexMap; 9113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned Index = 1; 9123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::iterator it = Asm.begin(), 9133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it, ++Index) 9143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionIndexMap[&it->getSection()] = Index; 9153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Index 0 is always the empty string. 9173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StringMap<uint64_t> StringIndexMap; 9183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StringTable += '\x00'; 9193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 920a0949b50dcea35c08b50542091f97275f401529dRafael Espindola // Add the data for the symbols. 9213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::symbol_iterator it = Asm.symbol_begin(), 9223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.symbol_end(); it != ie; ++it) { 9233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSymbol &Symbol = it->getSymbol(); 9243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 92588182132470527e27231f09b25a885893e528c66Rafael Espindola if (!isInSymtab(Asm, *it, UsedInReloc.count(&Symbol), 92688182132470527e27231f09b25a885893e528c66Rafael Espindola Renames.count(&Symbol))) 9273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming continue; 9283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData MSD; 9303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MSD.SymbolData = it; 931a0949b50dcea35c08b50542091f97275f401529dRafael Espindola bool Local = isLocal(*it); 93288182132470527e27231f09b25a885893e528c66Rafael Espindola const MCSymbol &RefSymbol = AliasedSymbol(Symbol); 9333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 934f7c10a3cff61c70efe8e405d9bdc5386e8e3fc0aRafael Espindola if (it->isCommon()) { 935a0949b50dcea35c08b50542091f97275f401529dRafael Espindola assert(!Local); 936f7c10a3cff61c70efe8e405d9bdc5386e8e3fc0aRafael Espindola MSD.SectionIndex = ELF::SHN_COMMON; 937bf052ac5d1c8f21075bc675f629709c20791c5f7Rafael Espindola } else if (Symbol.isAbsolute() || RefSymbol.isVariable()) { 938a0949b50dcea35c08b50542091f97275f401529dRafael Espindola MSD.SectionIndex = ELF::SHN_ABS; 93988182132470527e27231f09b25a885893e528c66Rafael Espindola } else if (RefSymbol.isUndefined()) { 9403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MSD.SectionIndex = ELF::SHN_UNDEF; 9413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 942bf052ac5d1c8f21075bc675f629709c20791c5f7Rafael Espindola MSD.SectionIndex = SectionIndexMap.lookup(&RefSymbol.getSection()); 9433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(MSD.SectionIndex && "Invalid section index!"); 9445df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola } 9455df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola 94688182132470527e27231f09b25a885893e528c66Rafael Espindola // The @@@ in symbol version is replaced with @ in undefined symbols and 94788182132470527e27231f09b25a885893e528c66Rafael Espindola // @@ in defined ones. 94888182132470527e27231f09b25a885893e528c66Rafael Espindola StringRef Name = Symbol.getName(); 94988182132470527e27231f09b25a885893e528c66Rafael Espindola size_t Pos = Name.find("@@@"); 95088182132470527e27231f09b25a885893e528c66Rafael Espindola std::string FinalName; 95188182132470527e27231f09b25a885893e528c66Rafael Espindola if (Pos != StringRef::npos) { 95207ee63283cc2b9a4d6c98ecd30d1b721fe3cb29aBenjamin Kramer StringRef Prefix = Name.substr(0, Pos); 95388182132470527e27231f09b25a885893e528c66Rafael Espindola unsigned n = MSD.SectionIndex == ELF::SHN_UNDEF ? 2 : 1; 95407ee63283cc2b9a4d6c98ecd30d1b721fe3cb29aBenjamin Kramer StringRef Suffix = Name.substr(Pos + n); 95588182132470527e27231f09b25a885893e528c66Rafael Espindola FinalName = Prefix.str() + Suffix.str(); 95688182132470527e27231f09b25a885893e528c66Rafael Espindola } else { 95788182132470527e27231f09b25a885893e528c66Rafael Espindola FinalName = Name.str(); 95888182132470527e27231f09b25a885893e528c66Rafael Espindola } 95988182132470527e27231f09b25a885893e528c66Rafael Espindola 96088182132470527e27231f09b25a885893e528c66Rafael Espindola uint64_t &Entry = StringIndexMap[FinalName]; 961a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola if (!Entry) { 962a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola Entry = StringTable.size(); 96388182132470527e27231f09b25a885893e528c66Rafael Espindola StringTable += FinalName; 964a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola StringTable += '\x00'; 9653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 966a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola MSD.StringIndex = Entry; 967a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola if (MSD.SectionIndex == ELF::SHN_UNDEF) 968a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola UndefinedSymbolData.push_back(MSD); 969a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola else if (Local) 970a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola LocalSymbolData.push_back(MSD); 971a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola else 972a6866969ba3b12901b412bb53ba8c61a9991b8adRafael Espindola ExternalSymbolData.push_back(MSD); 9733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 9743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Symbols are required to be in lexicographic order. 9763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(LocalSymbolData.begin(), LocalSymbolData.end()); 9773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(ExternalSymbolData.begin(), ExternalSymbolData.end()); 9783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(UndefinedSymbolData.begin(), UndefinedSymbolData.end()); 9793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Set the symbol indices. Local symbols must come before all other 9813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // symbols with non-local bindings. 9823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Index = 0; 9833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = LocalSymbolData.size(); i != e; ++i) 9843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LocalSymbolData[i].SymbolData->setIndex(Index++); 9853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = ExternalSymbolData.size(); i != e; ++i) 9863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ExternalSymbolData[i].SymbolData->setIndex(Index++); 9873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i) 9883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming UndefinedSymbolData[i].SymbolData->setIndex(Index++); 9893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 9903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9913565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout, 9923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData &SD) { 9933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (!Relocations[&SD].empty()) { 9943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCContext &Ctx = Asm.getContext(); 9953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSection *RelaSection; 9963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionELF &Section = 9973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming static_cast<const MCSectionELF&>(SD.getSection()); 9983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const StringRef SectionName = Section.getSectionName(); 1000377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer std::string RelaSectionName = HasRelocationAddend ? ".rela" : ".rel"; 10013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming RelaSectionName += SectionName; 1002299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer 1003299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer unsigned EntrySize; 1004299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer if (HasRelocationAddend) 1005299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer EntrySize = Is64Bit ? sizeof(ELF::Elf64_Rela) : sizeof(ELF::Elf32_Rela); 1006299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer else 1007299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer EntrySize = Is64Bit ? sizeof(ELF::Elf64_Rel) : sizeof(ELF::Elf32_Rel); 10083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1009377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer RelaSection = Ctx.getELFSection(RelaSectionName, HasRelocationAddend ? 1010377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer ELF::SHT_RELA : ELF::SHT_REL, 0, 10113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionKind::getReadOnly(), 10123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming false, EntrySize); 10133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSectionData &RelaSD = Asm.getOrCreateSectionData(*RelaSection); 1015a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer RelaSD.setAlignment(Is64Bit ? 8 : 4); 10163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCDataFragment *F = new MCDataFragment(&RelaSD); 10183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteRelocationsFragment(Asm, F, &SD); 10203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10217070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola Asm.AddSectionToTheEnd(*Writer, RelaSD, Layout); 10223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 10233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 10243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10253565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteSecHdrEntry(uint32_t Name, uint32_t Type, 10263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Flags, uint64_t Address, 10273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Offset, uint64_t Size, 10283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint32_t Link, uint32_t Info, 10293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Alignment, 10303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t EntrySize) { 10313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Name); // sh_name: index into string table 10323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Type); // sh_type 10333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Flags); // sh_flags 10343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Address); // sh_addr 10353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Offset); // sh_offset 10363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Size); // sh_size 10373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Link); // sh_link 10383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Info); // sh_info 10393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Alignment); // sh_addralign 10403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(EntrySize); // sh_entsize 10413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 10423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10433565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteRelocationsFragment(const MCAssembler &Asm, 10443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCDataFragment *F, 10453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData *SD) { 10463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFRelocationEntry> &Relocs = Relocations[SD]; 10473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // sort by the r_offset just like gnu as does 10483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(Relocs.begin(), Relocs.end()); 10493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = Relocs.size(); i != e; ++i) { 10513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFRelocationEntry entry = Relocs[e - i - 1]; 10523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10538f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola if (entry.Index < 0) 10548f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola entry.Index = getSymbolIndexInSymbolTable(Asm, entry.Symbol); 10558f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola else 10568f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola entry.Index += LocalSymbolData.size() + 1; 10575e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer if (Is64Bit) { 10585e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer char buf[8]; 10593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10605e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer String64(buf, entry.r_offset); 10615e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer F->getContents() += StringRef(buf, 8); 10625e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer 10638f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola struct ELF::Elf64_Rela ERE64; 10648f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ERE64.setSymbolAndType(entry.Index, entry.Type); 10658f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola String64(buf, ERE64.r_info); 10665e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer F->getContents() += StringRef(buf, 8); 10675e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer 10685e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer if (HasRelocationAddend) { 10695e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer String64(buf, entry.r_addend); 10705e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer F->getContents() += StringRef(buf, 8); 10715e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer } 10725e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer } else { 10735e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer char buf[4]; 10745e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer 10755e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer String32(buf, entry.r_offset); 10765e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer F->getContents() += StringRef(buf, 4); 10775e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer 10788f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola struct ELF::Elf32_Rela ERE32; 10798f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ERE32.setSymbolAndType(entry.Index, entry.Type); 10808f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola String32(buf, ERE32.r_info); 10815e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer F->getContents() += StringRef(buf, 4); 10825e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer 10835e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer if (HasRelocationAddend) { 10845e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer String32(buf, entry.r_addend); 10855e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer F->getContents() += StringRef(buf, 4); 10865e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer } 10875e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer } 10883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 10893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 10903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10913565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::CreateMetadataSections(MCAssembler &Asm, 10923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCAsmLayout &Layout) { 10933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCContext &Ctx = Asm.getContext(); 10943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCDataFragment *F; 10953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSection *SymtabSection; 10973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned EntrySize = Is64Bit ? ELF::SYMENTRY_SIZE64 : ELF::SYMENTRY_SIZE32; 10983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 109971859c640f6a36251aca223fd503c58dc314e296Rafael Espindola unsigned NumRegularSections = Asm.size(); 110071859c640f6a36251aca223fd503c58dc314e296Rafael Espindola 110138738bf1a847292003a5495f17e42a75d1274bf7Rafael Espindola // We construct .shstrtab, .symtab and .strtab in this order to match gnu as. 110271859c640f6a36251aca223fd503c58dc314e296Rafael Espindola const MCSection *ShstrtabSection; 110371859c640f6a36251aca223fd503c58dc314e296Rafael Espindola ShstrtabSection = Ctx.getELFSection(".shstrtab", ELF::SHT_STRTAB, 0, 110471859c640f6a36251aca223fd503c58dc314e296Rafael Espindola SectionKind::getReadOnly(), false); 110571859c640f6a36251aca223fd503c58dc314e296Rafael Espindola MCSectionData &ShstrtabSD = Asm.getOrCreateSectionData(*ShstrtabSection); 110671859c640f6a36251aca223fd503c58dc314e296Rafael Espindola ShstrtabSD.setAlignment(1); 110771859c640f6a36251aca223fd503c58dc314e296Rafael Espindola ShstrtabIndex = Asm.size(); 110871859c640f6a36251aca223fd503c58dc314e296Rafael Espindola 11093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SymtabSection = Ctx.getELFSection(".symtab", ELF::SHT_SYMTAB, 0, 11103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionKind::getReadOnly(), 11113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming false, EntrySize); 11123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSectionData &SymtabSD = Asm.getOrCreateSectionData(*SymtabSection); 11133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SymtabSD.setAlignment(Is64Bit ? 8 : 4); 11143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSection *StrtabSection; 11163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StrtabSection = Ctx.getELFSection(".strtab", ELF::SHT_STRTAB, 0, 11173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionKind::getReadOnly(), false); 11183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSectionData &StrtabSD = Asm.getOrCreateSectionData(*StrtabSection); 11193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StrtabSD.setAlignment(1); 11203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StringTableIndex = Asm.size(); 11213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1122c3c413f63117896f186fc4385bdaac0578d3613fRafael Espindola WriteRelocations(Asm, Layout); 112371859c640f6a36251aca223fd503c58dc314e296Rafael Espindola 112471859c640f6a36251aca223fd503c58dc314e296Rafael Espindola // Symbol table 112571859c640f6a36251aca223fd503c58dc314e296Rafael Espindola F = new MCDataFragment(&SymtabSD); 112671859c640f6a36251aca223fd503c58dc314e296Rafael Espindola WriteSymbolTable(F, Asm, Layout, NumRegularSections); 11277070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola Asm.AddSectionToTheEnd(*Writer, SymtabSD, Layout); 112871859c640f6a36251aca223fd503c58dc314e296Rafael Espindola 11293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F = new MCDataFragment(&StrtabSD); 11303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents().append(StringTable.begin(), StringTable.end()); 11317070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola Asm.AddSectionToTheEnd(*Writer, StrtabSD, Layout); 11323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F = new MCDataFragment(&ShstrtabSD); 11343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Section header string table. 11363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 11373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // The first entry of a string table holds a null character so skip 11383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // section 0. 11393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Index = 1; 11403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += '\x00'; 11413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 11433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 11443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionELF &Section = 1145368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer static_cast<const MCSectionELF&>(it->getSection()); 114651efe7a253190b672519e8388ce5d45f1dcf1a24Rafael Espindola // FIXME: We could merge suffixes like in .text and .rela.text. 11473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Remember the index into the string table so we can write it 11493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // into the sh_name field of the section header table. 11503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionStringTableIndex[&it->getSection()] = Index; 11513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Index += Section.getSectionName().size() + 1; 11533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += Section.getSectionName(); 11543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += '\x00'; 11553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 11563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11577070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola Asm.AddSectionToTheEnd(*Writer, ShstrtabSD, Layout); 11587070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola} 11597070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 11607070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindolabool ELFObjectWriterImpl::IsFixupFullyResolved(const MCAssembler &Asm, 11617070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCValue Target, 11627070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola bool IsPCRel, 11637070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCFragment *DF) const { 11647070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola // If this is a PCrel relocation, find the section this fixup value is 11657070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola // relative to. 11667070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSection *BaseSection = 0; 11677070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (IsPCRel) { 11687070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola BaseSection = &DF->getParent()->getSection(); 11697070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola assert(BaseSection); 11707070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola } 11717070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 11727070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSection *SectionA = 0; 11737070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSymbol *SymbolA = 0; 11747070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (const MCSymbolRefExpr *A = Target.getSymA()) { 11757070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola SymbolA = &A->getSymbol(); 11767070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola SectionA = &SymbolA->getSection(); 11777070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola } 11787070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 11797070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSection *SectionB = 0; 11807070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (const MCSymbolRefExpr *B = Target.getSymB()) { 11817070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola SectionB = &B->getSymbol().getSection(); 11827070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola } 11837070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 11847070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (!BaseSection) 11857070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola return SectionA == SectionB; 11867070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 11877070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSymbolData &DataA = Asm.getSymbolData(*SymbolA); 11887070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (DataA.isExternal()) 11897070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola return false; 11907070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 11917070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola return !SectionB && BaseSection == SectionA; 11923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 11933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11948f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindolavoid ELFObjectWriterImpl::WriteObject(MCAssembler &Asm, 11953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout) { 11968f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola // Compute symbol table information. 11978f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ComputeSymbolTable(Asm); 11988f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola 11993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming CreateMetadataSections(const_cast<MCAssembler&>(Asm), 12003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const_cast<MCAsmLayout&>(Layout)); 12013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Add 1 for the null section. 12033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned NumSections = Asm.size() + 1; 1204a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t NaturalAlignment = Is64Bit ? 8 : 4; 1205a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t HeaderSize = Is64Bit ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr); 1206a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t FileOff = HeaderSize; 12073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 12093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 12103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData &SD = *it; 12113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1212a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff = RoundUpToAlignment(FileOff, SD.getAlignment()); 1213a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 12143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Get the size of the section in the output file (including padding). 12153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Size = Layout.getSectionFileSize(&SD); 1216a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 1217a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff += Size; 12183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 12193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1220a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff = RoundUpToAlignment(FileOff, NaturalAlignment); 1221a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 12223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Write out the ELF header ... 1223a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer WriteHeader(FileOff - HeaderSize, NumSections); 1224a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 1225a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff = HeaderSize; 12263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ... then all of the sections ... 12283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming DenseMap<const MCSection*, uint64_t> SectionOffsetMap; 12293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1230d8e0bfe07a7d101eeed7204d1dfcaae17ad51908Rafael Espindola DenseMap<const MCSection*, uint32_t> SectionIndexMap; 123144cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer 123244cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer unsigned Index = 1; 12333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 12343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 1235a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer const MCSectionData &SD = *it; 1236a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 1237a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t Padding = OffsetToAlignment(FileOff, SD.getAlignment()); 1238a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer WriteZeros(Padding); 1239a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff += Padding; 1240a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 12413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Remember the offset into the file for this section. 12423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionOffsetMap[&it->getSection()] = FileOff; 124344cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer SectionIndexMap[&it->getSection()] = Index++; 124444cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer 12453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming FileOff += Layout.getSectionFileSize(&SD); 12463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Asm.WriteSectionData(it, Layout, Writer); 12483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 12493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1250a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t Padding = OffsetToAlignment(FileOff, NaturalAlignment); 1251a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer WriteZeros(Padding); 1252a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff += Padding; 1253a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 12543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ... and then the section header table. 12553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Should we align the section header table? 12563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 12573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Null section first. 12583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSecHdrEntry(0, 0, 0, 0, 0, 0, 0, 0, 0, 0); 12593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 12613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 12623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData &SD = *it; 12633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionELF &Section = 12643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming static_cast<const MCSectionELF&>(SD.getSection()); 12653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t sh_link = 0; 12673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t sh_info = 0; 12683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming switch(Section.getType()) { 12703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_DYNAMIC: 12713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_link = SectionStringTableIndex[&it->getSection()]; 12723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_info = 0; 12733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 12743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_REL: 1276f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman case ELF::SHT_RELA: { 12773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSection *SymtabSection; 12783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSection *InfoSection; 12793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SymtabSection = Asm.getContext().getELFSection(".symtab", ELF::SHT_SYMTAB, 0, 12813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionKind::getReadOnly(), 1282f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman false); 128344cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer sh_link = SectionIndexMap[SymtabSection]; 12843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1285377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer // Remove ".rel" and ".rela" prefixes. 1286377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer unsigned SecNameLen = (Section.getType() == ELF::SHT_REL) ? 4 : 5; 1287377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer StringRef SectionName = Section.getSectionName().substr(SecNameLen); 1288377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer 1289f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman InfoSection = Asm.getContext().getELFSection(SectionName, 12903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELF::SHT_PROGBITS, 0, 1291f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman SectionKind::getReadOnly(), 1292f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman false); 129344cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer sh_info = SectionIndexMap[InfoSection]; 12943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 1295f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman } 12963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_SYMTAB: 12983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_DYNSYM: 12993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_link = StringTableIndex; 13003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_info = LastLocalSymbolIndex; 13013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 13023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_PROGBITS: 13043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_STRTAB: 13053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_NOBITS: 130619dc7faf25e3a8cc37a656b74ebeef3ab976aa8eBenjamin Kramer case ELF::SHT_NULL: 1307cecbc3d28277ff4916326311cbf87335ed05d106Rafael Espindola case ELF::SHT_ARM_ATTRIBUTES: 13083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Nothing to do. 13093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 13103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming default: 13123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(0 && "FIXME: sh_type value not supported!"); 13133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 13143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 13153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSecHdrEntry(SectionStringTableIndex[&it->getSection()], 13173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Section.getType(), Section.getFlags(), 131871859c640f6a36251aca223fd503c58dc314e296Rafael Espindola 0, 13193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionOffsetMap.lookup(&SD.getSection()), 13203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Layout.getSectionSize(&SD), sh_link, 13213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_info, SD.getAlignment(), 13223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Section.getEntrySize()); 13233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 13243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 13253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13263565a06ebf44a193a8b333cbeff2ee154298d450Matt FlemingELFObjectWriter::ELFObjectWriter(raw_ostream &OS, 13273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool Is64Bit, 13285baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky Triple::OSType OSType, 1329eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck uint16_t EMachine, 13303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool IsLittleEndian, 13313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool HasRelocationAddend) 13323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming : MCObjectWriter(OS, IsLittleEndian) 13333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming{ 1334eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck Impl = new ELFObjectWriterImpl(this, Is64Bit, EMachine, 1335eecb858ca86fa949c06f819d6127e2ac68d165c8Wesley Peck HasRelocationAddend, OSType); 13363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 13373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13383565a06ebf44a193a8b333cbeff2ee154298d450Matt FlemingELFObjectWriter::~ELFObjectWriter() { 13393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming delete (ELFObjectWriterImpl*) Impl; 13403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 13413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13423565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm) { 13433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ((ELFObjectWriterImpl*) Impl)->ExecutePostLayoutBinding(Asm); 13443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 13453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13463565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriter::RecordRelocation(const MCAssembler &Asm, 13473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout, 13483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFragment *Fragment, 13493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFixup &Fixup, MCValue Target, 13503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t &FixedValue) { 13513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ((ELFObjectWriterImpl*) Impl)->RecordRelocation(Asm, Layout, Fragment, Fixup, 13523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Target, FixedValue); 13533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 13543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 13557070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindolabool ELFObjectWriter::IsFixupFullyResolved(const MCAssembler &Asm, 13567070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCValue Target, 13577070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola bool IsPCRel, 13587070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCFragment *DF) const { 13597070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola return ((ELFObjectWriterImpl*) Impl)->IsFixupFullyResolved(Asm, Target, 13607070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola IsPCRel, DF); 13617070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola} 13627070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 13638f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindolavoid ELFObjectWriter::WriteObject(MCAssembler &Asm, 13643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout) { 13653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ((ELFObjectWriterImpl*) Impl)->WriteObject(Asm, Layout); 13663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 1367