ELFObjectWriter.cpp revision 9baee3b3a3924bc45d007e54c71333739d135f8e
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 815c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindolastatic bool RelocNeedsGOT(unsigned Type) { 825c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola switch (Type) { 835c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola default: 845c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola return false; 855c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola case ELF::R_X86_64_GOT32: 865c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola case ELF::R_X86_64_PLT32: 875c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola case ELF::R_X86_64_GOTPCREL: 885c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola return true; 895c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola } 905c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola} 915c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola 923565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingnamespace { 933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming class ELFObjectWriterImpl { 95b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner /*static bool isFixupKindX86RIPRel(unsigned Kind) { 963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming return Kind == X86::reloc_riprel_4byte || 973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Kind == X86::reloc_riprel_4byte_movq_load; 98b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner }*/ 993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// ELFSymbolData - Helper struct for containing some precomputed information 1023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// on symbols. 1033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming struct ELFSymbolData { 1043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData *SymbolData; 1053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t StringIndex; 1063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint32_t SectionIndex; 1073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Support lexicographic sorting. 1093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool operator<(const ELFSymbolData &RHS) const { 110ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola if (GetType(*SymbolData) == ELF::STT_FILE) 111ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola return true; 112ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola if (GetType(*RHS.SymbolData) == ELF::STT_FILE) 113ad49cf586624c400302d17ecc2c2e41ea4346f1aRafael Espindola return false; 11436c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer return SymbolData->getSymbol().getName() < 11536c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer RHS.SymbolData->getSymbol().getName(); 1163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming }; 1183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @name Relocation Data 1203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @{ 1213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming struct ELFRelocationEntry { 1233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Make these big enough for both 32-bit and 64-bit 1243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t r_offset; 1258f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola int Index; 1268f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola unsigned Type; 1278f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola const MCSymbol *Symbol; 1283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t r_addend; 1293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Support lexicographic sorting. 1313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool operator<(const ELFRelocationEntry &RE) const { 1323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming return RE.r_offset < r_offset; 1333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming }; 1353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1368f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola SmallPtrSet<const MCSymbol *, 16> UsedInReloc; 1378f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola 1383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming llvm::DenseMap<const MCSectionData*, 1393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFRelocationEntry> > Relocations; 1403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming DenseMap<const MCSection*, uint64_t> SectionStringTableIndex; 1413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @} 1433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @name Symbol Table Data 1443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @{ 1453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SmallString<256> StringTable; 1473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFSymbolData> LocalSymbolData; 1483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFSymbolData> ExternalSymbolData; 1493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFSymbolData> UndefinedSymbolData; 1503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @} 1523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1538f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola int NumRegularSections; 1548f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola 1555c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola bool NeedsGOT; 1565c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola 1573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFObjectWriter *Writer; 1583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming raw_ostream &OS; 1603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned Is64Bit : 1; 1623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool HasRelocationAddend; 1643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1655baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky Triple::OSType OSType; 1665baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky 1673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // This holds the symbol table index of the last local symbol. 1683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned LastLocalSymbolIndex; 1693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // This holds the .strtab section index. 1703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned StringTableIndex; 1713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned ShstrtabIndex; 1733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming public: 1753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFObjectWriterImpl(ELFObjectWriter *_Writer, bool _Is64Bit, 1765baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky bool _HasRelAddend, Triple::OSType _OSType) 1775c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola : NeedsGOT(false), Writer(_Writer), OS(Writer->getStream()), 1785baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky Is64Bit(_Is64Bit), HasRelocationAddend(_HasRelAddend), 1795baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky OSType(_OSType) { 1803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void Write8(uint8_t Value) { Writer->Write8(Value); } 1833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void Write16(uint16_t Value) { Writer->Write16(Value); } 1843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void Write32(uint32_t Value) { Writer->Write32(Value); } 185b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner //void Write64(uint64_t Value) { Writer->Write64(Value); } 1863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteZeros(unsigned N) { Writer->WriteZeros(N); } 187b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner //void WriteBytes(StringRef Str, unsigned ZeroFillSize = 0) { 188b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner // Writer->WriteBytes(Str, ZeroFillSize); 189b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner //} 1903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteWord(uint64_t W) { 192b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner if (Is64Bit) 1933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Writer->Write64(W); 194b188a3789e2fc64ec7088a220c4c428c41d86faaChris Lattner else 1953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Writer->Write32(W); 1963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void String8(char *buf, uint8_t Value) { 1993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[0] = Value; 2003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringLE16(char *buf, uint16_t Value) { 2033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[0] = char(Value >> 0); 2043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[1] = char(Value >> 8); 2053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringLE32(char *buf, uint32_t Value) { 20836c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer StringLE16(buf, uint16_t(Value >> 0)); 209c522f6e70b02d161e4bf37023edb20643ee34acfBenjamin Kramer StringLE16(buf + 2, uint16_t(Value >> 16)); 2103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringLE64(char *buf, uint64_t Value) { 21336c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer StringLE32(buf, uint32_t(Value >> 0)); 214c522f6e70b02d161e4bf37023edb20643ee34acfBenjamin Kramer StringLE32(buf + 4, uint32_t(Value >> 32)); 2153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringBE16(char *buf ,uint16_t Value) { 2183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[0] = char(Value >> 8); 2193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[1] = char(Value >> 0); 2203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringBE32(char *buf, uint32_t Value) { 22336c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer StringBE16(buf, uint16_t(Value >> 16)); 224c522f6e70b02d161e4bf37023edb20643ee34acfBenjamin Kramer StringBE16(buf + 2, uint16_t(Value >> 0)); 2253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringBE64(char *buf, uint64_t Value) { 22836c6dc22bcaed92f03f7019a0d1cd47ea69e12daBenjamin Kramer StringBE32(buf, uint32_t(Value >> 32)); 229c522f6e70b02d161e4bf37023edb20643ee34acfBenjamin Kramer StringBE32(buf + 4, uint32_t(Value >> 0)); 2303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void String16(char *buf, uint16_t Value) { 2333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Writer->isLittleEndian()) 234f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringLE16(buf, Value); 2353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming else 236f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringBE16(buf, Value); 2373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void String32(char *buf, uint32_t Value) { 2403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Writer->isLittleEndian()) 241f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringLE32(buf, Value); 2423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming else 243f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringBE32(buf, Value); 2443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void String64(char *buf, uint64_t Value) { 2473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Writer->isLittleEndian()) 248f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringLE64(buf, Value); 2493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming else 250f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringBE64(buf, Value); 2513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteHeader(uint64_t SectionDataSize, unsigned NumberOfSections); 2543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteSymbolEntry(MCDataFragment *F, uint64_t name, uint8_t info, 2563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t value, uint64_t size, 2573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint8_t other, uint16_t shndx); 2583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteSymbol(MCDataFragment *F, ELFSymbolData &MSD, 2603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout); 2613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteSymbolTable(MCDataFragment *F, const MCAssembler &Asm, 26371859c640f6a36251aca223fd503c58dc314e296Rafael Espindola const MCAsmLayout &Layout, 26471859c640f6a36251aca223fd503c58dc314e296Rafael Espindola unsigned NumRegularSections); 2653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void RecordRelocation(const MCAssembler &Asm, const MCAsmLayout &Layout, 2673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFragment *Fragment, const MCFixup &Fixup, 2683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCValue Target, uint64_t &FixedValue); 2693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2700b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin Kramer uint64_t getSymbolIndexInSymbolTable(const MCAssembler &Asm, 2710b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin Kramer const MCSymbol *S); 2723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// ComputeSymbolTable - Compute the symbol table data 2743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// 2753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// \param StringTable [out] - The string table data. 2763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// \param StringIndexMap [out] - Map from symbol names to offsets in the 2773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// string table. 2783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void ComputeSymbolTable(MCAssembler &Asm); 2793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout, 2813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData &SD); 2823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteRelocations(MCAssembler &Asm, MCAsmLayout &Layout) { 2843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 2853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 2863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteRelocation(Asm, Layout, *it); 2873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void CreateMetadataSections(MCAssembler &Asm, MCAsmLayout &Layout); 2913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2920b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin Kramer void ExecutePostLayoutBinding(MCAssembler &Asm) { 2930b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin Kramer } 2943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteSecHdrEntry(uint32_t Name, uint32_t Type, uint64_t Flags, 2963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Address, uint64_t Offset, 2973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Size, uint32_t Link, uint32_t Info, 2983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Alignment, uint64_t EntrySize); 2993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteRelocationsFragment(const MCAssembler &Asm, MCDataFragment *F, 3013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData *SD); 3023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3037070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola bool IsFixupFullyResolved(const MCAssembler &Asm, 3047070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCValue Target, 3057070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola bool IsPCRel, 3067070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCFragment *DF) const; 3077070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 3088f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola void WriteObject(MCAssembler &Asm, const MCAsmLayout &Layout); 3093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming }; 3103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 3123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// Emit the ELF header. 3143565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteHeader(uint64_t SectionDataSize, 3153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned NumberOfSections) { 3163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ELF Header 3173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ---------- 3183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 3193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Note 3203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ---- 3213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // emitWord method behaves differently for ELF32 and ELF64, writing 3223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 4 bytes in the former and 8 in the latter. 3233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(0x7f); // e_ident[EI_MAG0] 3253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8('E'); // e_ident[EI_MAG1] 3263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8('L'); // e_ident[EI_MAG2] 3273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8('F'); // e_ident[EI_MAG3] 3283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(Is64Bit ? ELF::ELFCLASS64 : ELF::ELFCLASS32); // e_ident[EI_CLASS] 3303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_ident[EI_DATA] 3323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(Writer->isLittleEndian() ? ELF::ELFDATA2LSB : ELF::ELFDATA2MSB); 3333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(ELF::EV_CURRENT); // e_ident[EI_VERSION] 3355baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky // e_ident[EI_OSABI] 3365baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky switch (OSType) { 3375baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky case Triple::FreeBSD: Write8(ELF::ELFOSABI_FREEBSD); break; 3385baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky case Triple::Linux: Write8(ELF::ELFOSABI_LINUX); break; 3395baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky default: Write8(ELF::ELFOSABI_NONE); break; 3405baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky } 3413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(0); // e_ident[EI_ABIVERSION] 3423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteZeros(ELF::EI_NIDENT - ELF::EI_PAD); 3443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(ELF::ET_REL); // e_type 3463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // FIXME: Make this configurable 348eb97677764beb115c658ac559d3649c6c4068eb9Benjamin Kramer Write16(Is64Bit ? ELF::EM_X86_64 : ELF::EM_386); // e_machine = target 3493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(ELF::EV_CURRENT); // e_version 3513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(0); // e_entry, no entry point in .o file 3523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(0); // e_phoff, no program header for .o 353eb97677764beb115c658ac559d3649c6c4068eb9Benjamin Kramer WriteWord(SectionDataSize + (Is64Bit ? sizeof(ELF::Elf64_Ehdr) : 354eb97677764beb115c658ac559d3649c6c4068eb9Benjamin Kramer sizeof(ELF::Elf32_Ehdr))); // e_shoff = sec hdr table off in bytes 3553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // FIXME: Make this configurable. 3573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(0); // e_flags = whatever the target wants 3583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_ehsize = ELF header size 3603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(Is64Bit ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr)); 3613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(0); // e_phentsize = prog header entry size 3633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(0); // e_phnum = # prog header entries = 0 3643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_shentsize = Section header entry size 3663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(Is64Bit ? sizeof(ELF::Elf64_Shdr) : sizeof(ELF::Elf32_Shdr)); 3673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_shnum = # of section header ents 3693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(NumberOfSections); 3703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_shstrndx = Section # of '.shstrtab' 3723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(ShstrtabIndex); 3733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 3743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3753565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteSymbolEntry(MCDataFragment *F, uint64_t name, 3763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint8_t info, uint64_t value, 3773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t size, uint8_t other, 3783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint16_t shndx) { 3793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Is64Bit) { 3803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming char buf[8]; 3813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String32(buf, name); 3833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 4); // st_name 3843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String8(buf, info); 3863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 1); // st_info 387368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer 3883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String8(buf, other); 3893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 1); // st_other 3903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String16(buf, shndx); 3923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 2); // st_shndx 3933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String64(buf, value); 3953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 8); // st_value 3963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String64(buf, size); 3983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 8); // st_size 3993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 4003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming char buf[4]; 4013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String32(buf, name); 4033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 4); // st_name 4043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String32(buf, value); 4063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 4); // st_value 4073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String32(buf, size); 4093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 4); // st_size 4103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String8(buf, info); 4123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 1); // st_info 4133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String8(buf, other); 4153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 1); // st_other 4163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String16(buf, shndx); 4183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 2); // st_shndx 4193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 4203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 4213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4222c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindolastatic uint64_t SymbolValue(MCSymbolData &Data, const MCAsmLayout &Layout) { 4232c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola if (Data.isCommon() && Data.isExternal()) 4242c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola return Data.getCommonAlignment(); 4252c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola 4262c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola const MCSymbol &Symbol = Data.getSymbol(); 4272c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola if (!Symbol.isInSection()) 4282c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola return 0; 4292c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola 4302c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola if (!Data.isCommon() && !(Data.getFlags() & ELF_STB_Weak)) 4312c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola if (MCFragment *FF = Data.getFragment()) 4322c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola return Layout.getSymbolAddress(&Data) - 4332c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola Layout.getSectionAddress(FF->getParent()); 4342c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola 4352c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola return 0; 4362c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola} 4372c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola 438de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindolastatic const MCSymbol &AliasedSymbol(const MCSymbol &Symbol) { 439de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola const MCSymbol *S = &Symbol; 440de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola while (S->isVariable()) { 441de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola const MCExpr *Value = S->getVariableValue(); 442152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola assert (Value->getKind() == MCExpr::SymbolRef && "Unimplemented"); 443152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola const MCSymbolRefExpr *Ref = static_cast<const MCSymbolRefExpr*>(Value); 444de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola S = &Ref->getSymbol(); 445152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola } 446de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola return *S; 447de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola} 448de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola 449de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindolavoid ELFObjectWriterImpl::WriteSymbol(MCDataFragment *F, ELFSymbolData &MSD, 450de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola const MCAsmLayout &Layout) { 451de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola MCSymbolData &OrigData = *MSD.SymbolData; 452de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola MCSymbolData &Data = 453de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola Layout.getAssembler().getSymbolData(AliasedSymbol(OrigData.getSymbol())); 454152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola 455152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Binding = GetBinding(OrigData); 456152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Visibility = GetVisibility(OrigData); 457152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Type = GetType(Data); 458152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola 459152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Info = (Binding << ELF_STB_Shift) | (Type << ELF_STT_Shift); 460152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola uint8_t Other = Visibility; 461152c1061e0b4ad379eec5fa38ee0091fc11ff936Rafael Espindola 4622c6ec31df6c6c45ad735892eedab78612ac2847bRafael Espindola uint64_t Value = SymbolValue(Data, Layout); 4633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Size = 0; 4643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCExpr *ESize; 4653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 466f7c10a3cff61c70efe8e405d9bdc5386e8e3fc0aRafael Espindola assert(!(Data.isCommon() && !Data.isExternal())); 467f7c10a3cff61c70efe8e405d9bdc5386e8e3fc0aRafael Espindola 4683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ESize = Data.getSize(); 4693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Data.getSize()) { 4703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCValue Res; 4713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (ESize->getKind() == MCExpr::Binary) { 4723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(ESize); 4733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (BE->EvaluateAsRelocatable(Res, &Layout)) { 47524f1206c7de0f21d309d27737071ad742d5ddf27Benjamin Kramer assert(!Res.getSymA() || !Res.getSymA()->getSymbol().isDefined()); 47624f1206c7de0f21d309d27737071ad742d5ddf27Benjamin Kramer assert(!Res.getSymB() || !Res.getSymB()->getSymbol().isDefined()); 477f230df9af4012f9510de664b6d62b128e26a5861Rafael Espindola Size = Res.getConstant(); 4783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 4793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else if (ESize->getKind() == MCExpr::Constant) { 480368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer Size = static_cast<const MCConstantExpr *>(ESize)->getValue(); 4813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 4823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(0 && "Unsupported size expression"); 4833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 4843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 4853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Write out the symbol table entry 4873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSymbolEntry(F, MSD.StringIndex, Info, Value, 4883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Size, Other, MSD.SectionIndex); 4893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 4903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4913565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteSymbolTable(MCDataFragment *F, 4923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAssembler &Asm, 49371859c640f6a36251aca223fd503c58dc314e296Rafael Espindola const MCAsmLayout &Layout, 49471859c640f6a36251aca223fd503c58dc314e296Rafael Espindola unsigned NumRegularSections) { 4953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // The string table must be emitted first because we need the index 4963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // into the string table for all the symbol names. 4973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(StringTable.size() && "Missing string table"); 4983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // FIXME: Make sure the start of the symbol table is aligned. 5003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // The first entry is the undefined symbol entry. 5023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned EntrySize = Is64Bit ? ELF::SYMENTRY_SIZE64 : ELF::SYMENTRY_SIZE32; 503368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer F->getContents().append(EntrySize, '\x00'); 5043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Write the symbol table entries. 5063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LastLocalSymbolIndex = LocalSymbolData.size() + 1; 5073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = LocalSymbolData.size(); i != e; ++i) { 5083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData &MSD = LocalSymbolData[i]; 5093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSymbol(F, MSD, Layout); 5103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 51271859c640f6a36251aca223fd503c58dc314e296Rafael Espindola // Write out a symbol table entry for each regular section. 513a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman unsigned Index = 1; 51471859c640f6a36251aca223fd503c58dc314e296Rafael Espindola for (MCAssembler::const_iterator it = Asm.begin(); 51571859c640f6a36251aca223fd503c58dc314e296Rafael Espindola Index <= NumRegularSections; ++it, ++Index) { 516a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman const MCSectionELF &Section = 517368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer static_cast<const MCSectionELF&>(it->getSection()); 518a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman // Leave out relocations so we don't have indexes within 519a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman // the relocations messed up 520377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer if (Section.getType() == ELF::SHT_RELA || Section.getType() == ELF::SHT_REL) 521a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman continue; 5223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSymbolEntry(F, 0, ELF::STT_SECTION, 0, 0, ELF::STV_DEFAULT, Index); 523a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman LastLocalSymbolIndex++; 524a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman } 5253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = ExternalSymbolData.size(); i != e; ++i) { 5273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData &MSD = ExternalSymbolData[i]; 5283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData &Data = *MSD.SymbolData; 5293223f19ff0920ffee686faba3bf74babf580e8a5Rafael Espindola assert(((Data.getFlags() & ELF_STB_Global) || 5303223f19ff0920ffee686faba3bf74babf580e8a5Rafael Espindola (Data.getFlags() & ELF_STB_Weak)) && 5313223f19ff0920ffee686faba3bf74babf580e8a5Rafael Espindola "External symbol requires STB_GLOBAL or STB_WEAK flag"); 5323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSymbol(F, MSD, Layout); 533e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola if (GetBinding(Data) == ELF::STB_LOCAL) 5343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LastLocalSymbolIndex++; 5353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i) { 5383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData &MSD = UndefinedSymbolData[i]; 5393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData &Data = *MSD.SymbolData; 5403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSymbol(F, MSD, Layout); 541e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola if (GetBinding(Data) == ELF::STB_LOCAL) 5423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LastLocalSymbolIndex++; 5433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 5453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5467eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindolastatic bool ShouldRelocOnSymbol(const MCSymbolData &SD, 5473729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola const MCValue &Target, 5483729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola const MCFragment &F) { 5497eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola const MCSymbol &Symbol = SD.getSymbol(); 5507eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola if (Symbol.isUndefined()) 5517eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola return true; 5527eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola 5537eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola const MCSectionELF &Section = 5547eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola static_cast<const MCSectionELF&>(Symbol.getSection()); 5557eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola 5567eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola if (SD.isExternal()) 5577eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola return true; 5587eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola 5598cecf253e45f144b9a7fd0ace85eeeeb0bebfc83Rafael Espindola MCSymbolRefExpr::VariantKind Kind = Target.getSymA()->getKind(); 5603729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola const MCSectionELF &Sec2 = 5613729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola static_cast<const MCSectionELF&>(F.getParent()->getSection()); 5623729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola 5638cecf253e45f144b9a7fd0ace85eeeeb0bebfc83Rafael Espindola if (&Sec2 != &Section && 564c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola (Kind == MCSymbolRefExpr::VK_PLT || 565c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola Kind == MCSymbolRefExpr::VK_GOTPCREL || 566c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola Kind == MCSymbolRefExpr::VK_GOTOFF)) 5673729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola return true; 5683729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola 569c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola if (Section.getFlags() & MCSectionELF::SHF_MERGE) 570c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola return Target.getConstant() != 0; 571c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola 5727eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola return false; 57373ffea47d20bc9f559b4ce0c60166ee504073832Rafael Espindola} 57473ffea47d20bc9f559b4ce0c60166ee504073832Rafael Espindola 575e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer// FIXME: this is currently X86/X86_64 only 5763565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::RecordRelocation(const MCAssembler &Asm, 5773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout, 5783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFragment *Fragment, 5793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFixup &Fixup, 5803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCValue Target, 5813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t &FixedValue) { 5823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming int64_t Addend = 0; 5838f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola int Index = 0; 58495c602ade3aa30de17abd53b85968a3feb8fdfbcBenjamin Kramer int64_t Value = Target.getConstant(); 5858f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola const MCSymbol *Symbol = 0; 5863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5870007489312ecb1b51ae275f1e452786480151a4cRafael Espindola bool IsPCRel = isFixupKindX86PCRel(Fixup.getKind()); 58881cfb8529b7fd1e98fefb79fb46b10301b93ab75Benjamin Kramer if (!Target.isAbsolute()) { 589de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola Symbol = &AliasedSymbol(Target.getSymA()->getSymbol()); 5903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData &SD = Asm.getSymbolData(*Symbol); 59163d37b932278724d51e7f8bd1f2574c7b45f85f0Benjamin Kramer MCFragment *F = SD.getFragment(); 5923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5939d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola if (const MCSymbolRefExpr *RefB = Target.getSymB()) { 5949d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola const MCSymbol &SymbolB = RefB->getSymbol(); 5959d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola MCSymbolData &SDB = Asm.getSymbolData(SymbolB); 5969d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola IsPCRel = true; 59755fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola MCSectionData *Sec = Fragment->getParent(); 59855fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola 59955fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola // Offset of the symbol in the section 60055fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola int64_t a = Layout.getSymbolAddress(&SDB) - Layout.getSectionAddress(Sec); 60155fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola 60255fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola // Ofeset of the relocation in the section 60355fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola int64_t b = Layout.getFragmentOffset(Fragment) + Fixup.getOffset(); 60455fb102130925ada2bbc78abbbb70394d96d945eRafael Espindola Value += b - a; 6059d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola } 6069d8b7555cde8b9722dd6f8dc77c627bae0718c67Rafael Espindola 6077eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola // Check that this case has already been fully resolved before we get 6087eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola // here. 6090007489312ecb1b51ae275f1e452786480151a4cRafael Espindola if (Symbol->isDefined() && !SD.isExternal() && 6100007489312ecb1b51ae275f1e452786480151a4cRafael Espindola IsPCRel && 6110007489312ecb1b51ae275f1e452786480151a4cRafael Espindola &Fragment->getParent()->getSection() == &Symbol->getSection()) { 6127eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola llvm_unreachable("We don't need a relocation in this case."); 6130007489312ecb1b51ae275f1e452786480151a4cRafael Espindola return; 6140007489312ecb1b51ae275f1e452786480151a4cRafael Espindola } 6150007489312ecb1b51ae275f1e452786480151a4cRafael Espindola 6163729d0052bda365d04fee900c6f3d09460f1e108Rafael Espindola bool RelocOnSymbol = ShouldRelocOnSymbol(SD, Target, *Fragment); 6177eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola if (!RelocOnSymbol) { 6188f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola Index = F->getParent()->getOrdinal(); 6197eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola 6207eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola MCSectionData *FSD = F->getParent(); 6217eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola // Offset of the symbol in the section 6227eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola Value += Layout.getSymbolAddress(&SD) - Layout.getSectionAddress(FSD); 6238f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola } else { 6248f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola UsedInReloc.insert(Symbol); 6258f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola Index = -1; 6268f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola } 6277eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola Addend = Value; 6287eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola // Compensate for the addend on i386. 6297eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola if (Is64Bit) 6307eae36b38b874f417fa191fc1cfec22c100f164dRafael Espindola Value = 0; 6313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 6323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 63395c602ade3aa30de17abd53b85968a3feb8fdfbcBenjamin Kramer FixedValue = Value; 63495c602ade3aa30de17abd53b85968a3feb8fdfbcBenjamin Kramer 6353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // determine the type of the relocation 63628f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola 63728f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola MCSymbolRefExpr::VariantKind Modifier = Target.getSymA()->getKind(); 63863d37b932278724d51e7f8bd1f2574c7b45f85f0Benjamin Kramer unsigned Type; 639e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer if (Is64Bit) { 640e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer if (IsPCRel) { 64192bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola switch (Modifier) { 6429edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola default: 6439edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola llvm_unreachable("Unimplemented"); 64492bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola case MCSymbolRefExpr::VK_None: 64592bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola Type = ELF::R_X86_64_PC32; 64692bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola break; 64792bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola case MCSymbolRefExpr::VK_PLT: 64892bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola Type = ELF::R_X86_64_PLT32; 64992bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola break; 650607d1f6d3216b647c07965bafae8d1aba6312136Rafael Espindola case llvm::MCSymbolRefExpr::VK_GOTPCREL: 651607d1f6d3216b647c07965bafae8d1aba6312136Rafael Espindola Type = ELF::R_X86_64_GOTPCREL; 652607d1f6d3216b647c07965bafae8d1aba6312136Rafael Espindola break; 65392bf6684f62e1df48ecc0a9b3cc3a99ce7c00747Rafael Espindola } 654e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } else { 655e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer switch ((unsigned)Fixup.getKind()) { 656e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer default: llvm_unreachable("invalid fixup kind!"); 657e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_8: Type = ELF::R_X86_64_64; break; 658a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola case X86::reloc_signed_4byte: 659e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case X86::reloc_pcrel_4byte: 660a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola assert(isInt<32>(Target.getConstant())); 66128f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola switch (Modifier) { 6629edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola default: 6639edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola llvm_unreachable("Unimplemented"); 66428f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola case MCSymbolRefExpr::VK_None: 66528f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola Type = ELF::R_X86_64_32S; 66628f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola break; 66728f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola case MCSymbolRefExpr::VK_GOT: 66828f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola Type = ELF::R_X86_64_GOT32; 66928f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola break; 670c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola case MCSymbolRefExpr::VK_GOTPCREL: 6718cecf253e45f144b9a7fd0ace85eeeeb0bebfc83Rafael Espindola Type = ELF::R_X86_64_GOTPCREL; 6728cecf253e45f144b9a7fd0ace85eeeeb0bebfc83Rafael Espindola break; 67328f9ac81012e1e278128a4148e93f6ab873f15d8Rafael Espindola } 674a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola break; 675e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_4: 676a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola Type = ELF::R_X86_64_32; 677e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer break; 678e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_2: Type = ELF::R_X86_64_16; break; 679e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case X86::reloc_pcrel_1byte: 680e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_1: Type = ELF::R_X86_64_8; break; 681e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } 682e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } 6833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 684e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer if (IsPCRel) { 6859edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola switch (Modifier) { 6869edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola default: 6879baee3b3a3924bc45d007e54c71333739d135f8eRafael Espindola Type = ELF::R_386_PC32; 6889baee3b3a3924bc45d007e54c71333739d135f8eRafael Espindola //llvm_unreachable("Unimplemented"); 6899baee3b3a3924bc45d007e54c71333739d135f8eRafael Espindola break; 6909edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola case MCSymbolRefExpr::VK_PLT: 6919edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola Type = ELF::R_386_PLT32; 6929edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola break; 6939edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola } 694e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } else { 695e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer switch ((unsigned)Fixup.getKind()) { 696e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer default: llvm_unreachable("invalid fixup kind!"); 697a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola 698a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola // FIXME: Should we avoid selecting reloc_signed_4byte in 32 bit mode 699a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola // instead? 700a8c02c3bdd68e65d14fb6b0d56989663754059b0Rafael Espindola case X86::reloc_signed_4byte: 701e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case X86::reloc_pcrel_4byte: 702c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola switch (Modifier) { 7039edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola default: 7049edab3a9e15c40c1c9bf70df81c6afdab1cd02c2Rafael Espindola llvm_unreachable("Unimplemented"); 705c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola case MCSymbolRefExpr::VK_GOTOFF: 706c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola Type = ELF::R_386_GOTOFF; 707c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola break; 708c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola } 709c97f80efc80030c7544a9903c79d2dccd197a0ffRafael Espindola break; 710e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_4: Type = ELF::R_386_32; break; 711e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_2: Type = ELF::R_386_16; break; 712e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case X86::reloc_pcrel_1byte: 713e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer case FK_Data_1: Type = ELF::R_386_8; break; 714e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer } 7153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 7163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 7173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 7185c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola if (RelocNeedsGOT(Type)) 7195c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola NeedsGOT = true; 7205c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola 721e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer ELFRelocationEntry ERE; 722e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer 7238f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ERE.Index = Index; 7248f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ERE.Type = Type; 7258f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ERE.Symbol = Symbol; 7263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 72763d37b932278724d51e7f8bd1f2574c7b45f85f0Benjamin Kramer ERE.r_offset = Layout.getFragmentOffset(Fragment) + Fixup.getOffset(); 728e5b57347e9485b59dd8d70f8f90d7794f473147aBenjamin Kramer 7293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (HasRelocationAddend) 7303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ERE.r_addend = Addend; 731172d7d6a12b313dd5a8c1588b8f6bd49b1ce16b6Benjamin Kramer else 732172d7d6a12b313dd5a8c1588b8f6bd49b1ce16b6Benjamin Kramer ERE.r_addend = 0; // Silence compiler warning. 7333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 7343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Relocations[Fragment->getParent()].push_back(ERE); 7353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 7363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 7370b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin Krameruint64_t 7380b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin KramerELFObjectWriterImpl::getSymbolIndexInSymbolTable(const MCAssembler &Asm, 7390b6cbfe04cb36872255aff11a41a2b976ceba462Benjamin Kramer const MCSymbol *S) { 7407b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer MCSymbolData &SD = Asm.getSymbolData(*S); 7417b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer 7427b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer // Local symbol. 7437b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer if (!SD.isExternal() && !S->isUndefined()) 7447b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer return SD.getIndex() + /* empty symbol */ 1; 7457b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer 7467b83c26051b0474fb5f8b73ba6e74bd4f40324baBenjamin Kramer // External or undefined symbol. 7478f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola return SD.getIndex() + NumRegularSections + /* empty symbol */ 1; 7483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 7493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 750737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindolastatic bool isInSymtab(const MCAssembler &Asm, const MCSymbolData &Data, 751737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola bool Used) { 752737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola const MCSymbol &Symbol = Data.getSymbol(); 753737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola if (!Asm.isSymbolLinkerVisible(Symbol) && !Symbol.isUndefined()) 754737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return false; 755737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 756737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola if (!Used && Symbol.isTemporary()) 757737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return false; 758737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 759737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return true; 760737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola} 761737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 762737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindolastatic bool isLocal(const MCSymbolData &Data) { 763737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola if (Data.isExternal()) 764737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return false; 765737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 766737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola const MCSymbol &Symbol = Data.getSymbol(); 767737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola if (Symbol.isUndefined() && !Symbol.isVariable()) 768737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return false; 769737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 770737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola return true; 771737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola} 772737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola 7733565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::ComputeSymbolTable(MCAssembler &Asm) { 7745c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola // FIXME: Is this the correct place to do this? 7755c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola if (NeedsGOT) { 7765c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola llvm::StringRef Name = "_GLOBAL_OFFSET_TABLE_"; 7775c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola MCSymbol *Sym = Asm.getContext().GetOrCreateSymbol(Name); 7785c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola MCSymbolData &Data = Asm.getOrCreateSymbolData(*Sym); 7795c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola Data.setExternal(true); 7805c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola } 7815c77c16f311d702a315547c0eb32b7a34a9d55c8Rafael Espindola 7823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Build section lookup table. 7838f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola NumRegularSections = Asm.size(); 784f5c347dfc25e133e357c7086ad1b24edad4d2bc8Rafael Espindola DenseMap<const MCSection*, uint32_t> SectionIndexMap; 7853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned Index = 1; 7863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::iterator it = Asm.begin(), 7873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it, ++Index) 7883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionIndexMap[&it->getSection()] = Index; 7893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 7903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Index 0 is always the empty string. 7913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StringMap<uint64_t> StringIndexMap; 7923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StringTable += '\x00'; 7933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 794a0949b50dcea35c08b50542091f97275f401529dRafael Espindola // Add the data for the symbols. 7953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::symbol_iterator it = Asm.symbol_begin(), 7963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.symbol_end(); it != ie; ++it) { 7973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSymbol &Symbol = it->getSymbol(); 7983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 799737cd213e359c2862253c3a1ee443419566e90b9Rafael Espindola if (!isInSymtab(Asm, *it, UsedInReloc.count(&Symbol))) 8003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming continue; 8013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData MSD; 8033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MSD.SymbolData = it; 804a0949b50dcea35c08b50542091f97275f401529dRafael Espindola bool Local = isLocal(*it); 8053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8065df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola bool Add = false; 807f7c10a3cff61c70efe8e405d9bdc5386e8e3fc0aRafael Espindola if (it->isCommon()) { 808a0949b50dcea35c08b50542091f97275f401529dRafael Espindola assert(!Local); 809f7c10a3cff61c70efe8e405d9bdc5386e8e3fc0aRafael Espindola MSD.SectionIndex = ELF::SHN_COMMON; 8105df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola Add = true; 811a0949b50dcea35c08b50542091f97275f401529dRafael Espindola } else if (Symbol.isAbsolute()) { 812a0949b50dcea35c08b50542091f97275f401529dRafael Espindola MSD.SectionIndex = ELF::SHN_ABS; 8135df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola Add = true; 81401f9ea35a71b4efb00de8e4c9e9136c9c88f6273Rafael Espindola } else if (Symbol.isVariable()) { 815de89b010b0b347cdbd1bc9553a970880a3e721bfRafael Espindola const MCSymbol &RefSymbol = AliasedSymbol(Symbol); 81601f9ea35a71b4efb00de8e4c9e9136c9c88f6273Rafael Espindola if (RefSymbol.isDefined()) { 81701f9ea35a71b4efb00de8e4c9e9136c9c88f6273Rafael Espindola MSD.SectionIndex = SectionIndexMap.lookup(&RefSymbol.getSection()); 81801f9ea35a71b4efb00de8e4c9e9136c9c88f6273Rafael Espindola assert(MSD.SectionIndex && "Invalid section index!"); 8195df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola Add = true; 82001f9ea35a71b4efb00de8e4c9e9136c9c88f6273Rafael Espindola } 821f7c10a3cff61c70efe8e405d9bdc5386e8e3fc0aRafael Espindola } else if (Symbol.isUndefined()) { 822a0949b50dcea35c08b50542091f97275f401529dRafael Espindola assert(!Local); 8233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MSD.SectionIndex = ELF::SHN_UNDEF; 824e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola // FIXME: Undefined symbols are global, but this is the first place we 825e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola // are able to set it. 826e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola if (GetBinding(*it) == ELF::STB_LOCAL) 827e15eb4e14cd543b925a837026cbdde9f94393e1cRafael Espindola SetBinding(*it, ELF::STB_GLOBAL); 8285df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola Add = true; 8293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 8303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MSD.SectionIndex = SectionIndexMap.lookup(&Symbol.getSection()); 8313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(MSD.SectionIndex && "Invalid section index!"); 8325df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola Add = true; 8335df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola } 8345df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola 8355df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola if (Add) { 8365df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola uint64_t &Entry = StringIndexMap[Symbol.getName()]; 8375df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola if (!Entry) { 8385df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola Entry = StringTable.size(); 8395df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola StringTable += Symbol.getName(); 8405df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola StringTable += '\x00'; 8415df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola } 8425df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola MSD.StringIndex = Entry; 8435df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola if (MSD.SectionIndex == ELF::SHN_UNDEF) 8445df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola UndefinedSymbolData.push_back(MSD); 8455df0b65e8f5ef55f0b515a0b24879f5d117d6042Rafael Espindola else if (Local) 846a0949b50dcea35c08b50542091f97275f401529dRafael Espindola LocalSymbolData.push_back(MSD); 847a0949b50dcea35c08b50542091f97275f401529dRafael Espindola else 848a0949b50dcea35c08b50542091f97275f401529dRafael Espindola ExternalSymbolData.push_back(MSD); 8493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 8503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 8513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Symbols are required to be in lexicographic order. 8533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(LocalSymbolData.begin(), LocalSymbolData.end()); 8543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(ExternalSymbolData.begin(), ExternalSymbolData.end()); 8553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(UndefinedSymbolData.begin(), UndefinedSymbolData.end()); 8563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Set the symbol indices. Local symbols must come before all other 8583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // symbols with non-local bindings. 8593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Index = 0; 8603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = LocalSymbolData.size(); i != e; ++i) 8613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LocalSymbolData[i].SymbolData->setIndex(Index++); 8623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = ExternalSymbolData.size(); i != e; ++i) 8633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ExternalSymbolData[i].SymbolData->setIndex(Index++); 8643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i) 8653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming UndefinedSymbolData[i].SymbolData->setIndex(Index++); 8663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 8673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8683565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout, 8693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData &SD) { 8703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (!Relocations[&SD].empty()) { 8713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCContext &Ctx = Asm.getContext(); 8723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSection *RelaSection; 8733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionELF &Section = 8743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming static_cast<const MCSectionELF&>(SD.getSection()); 8753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const StringRef SectionName = Section.getSectionName(); 877377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer std::string RelaSectionName = HasRelocationAddend ? ".rela" : ".rel"; 8783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming RelaSectionName += SectionName; 879299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer 880299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer unsigned EntrySize; 881299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer if (HasRelocationAddend) 882299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer EntrySize = Is64Bit ? sizeof(ELF::Elf64_Rela) : sizeof(ELF::Elf32_Rela); 883299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer else 884299fbe3a5aad8f08c52c488a9b28df70c7595e0dBenjamin Kramer EntrySize = Is64Bit ? sizeof(ELF::Elf64_Rel) : sizeof(ELF::Elf32_Rel); 8853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 886377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer RelaSection = Ctx.getELFSection(RelaSectionName, HasRelocationAddend ? 887377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer ELF::SHT_RELA : ELF::SHT_REL, 0, 8883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionKind::getReadOnly(), 8893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming false, EntrySize); 8903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSectionData &RelaSD = Asm.getOrCreateSectionData(*RelaSection); 892a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer RelaSD.setAlignment(Is64Bit ? 8 : 4); 8933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCDataFragment *F = new MCDataFragment(&RelaSD); 8953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteRelocationsFragment(Asm, F, &SD); 8973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8987070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola Asm.AddSectionToTheEnd(*Writer, RelaSD, Layout); 8993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 9003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 9013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9023565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteSecHdrEntry(uint32_t Name, uint32_t Type, 9033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Flags, uint64_t Address, 9043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Offset, uint64_t Size, 9053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint32_t Link, uint32_t Info, 9063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Alignment, 9073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t EntrySize) { 9083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Name); // sh_name: index into string table 9093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Type); // sh_type 9103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Flags); // sh_flags 9113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Address); // sh_addr 9123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Offset); // sh_offset 9133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Size); // sh_size 9143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Link); // sh_link 9153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Info); // sh_info 9163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Alignment); // sh_addralign 9173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(EntrySize); // sh_entsize 9183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 9193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9203565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteRelocationsFragment(const MCAssembler &Asm, 9213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCDataFragment *F, 9223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData *SD) { 9233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFRelocationEntry> &Relocs = Relocations[SD]; 9243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // sort by the r_offset just like gnu as does 9253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(Relocs.begin(), Relocs.end()); 9263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = Relocs.size(); i != e; ++i) { 9283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFRelocationEntry entry = Relocs[e - i - 1]; 9293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9308f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola if (entry.Index < 0) 9318f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola entry.Index = getSymbolIndexInSymbolTable(Asm, entry.Symbol); 9328f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola else 9338f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola entry.Index += LocalSymbolData.size() + 1; 9345e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer if (Is64Bit) { 9355e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer char buf[8]; 9363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9375e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer String64(buf, entry.r_offset); 9385e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer F->getContents() += StringRef(buf, 8); 9395e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer 9408f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola struct ELF::Elf64_Rela ERE64; 9418f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ERE64.setSymbolAndType(entry.Index, entry.Type); 9428f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola String64(buf, ERE64.r_info); 9435e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer F->getContents() += StringRef(buf, 8); 9445e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer 9455e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer if (HasRelocationAddend) { 9465e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer String64(buf, entry.r_addend); 9475e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer F->getContents() += StringRef(buf, 8); 9485e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer } 9495e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer } else { 9505e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer char buf[4]; 9515e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer 9525e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer String32(buf, entry.r_offset); 9535e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer F->getContents() += StringRef(buf, 4); 9545e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer 9558f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola struct ELF::Elf32_Rela ERE32; 9568f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ERE32.setSymbolAndType(entry.Index, entry.Type); 9578f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola String32(buf, ERE32.r_info); 9585e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer F->getContents() += StringRef(buf, 4); 9595e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer 9605e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer if (HasRelocationAddend) { 9615e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer String32(buf, entry.r_addend); 9625e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer F->getContents() += StringRef(buf, 4); 9635e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer } 9645e492e8d42fa1f2940165a937d3d613c61b57708Benjamin Kramer } 9653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 9663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 9673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9683565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::CreateMetadataSections(MCAssembler &Asm, 9693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCAsmLayout &Layout) { 9703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCContext &Ctx = Asm.getContext(); 9713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCDataFragment *F; 9723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSection *SymtabSection; 9743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned EntrySize = Is64Bit ? ELF::SYMENTRY_SIZE64 : ELF::SYMENTRY_SIZE32; 9753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 97671859c640f6a36251aca223fd503c58dc314e296Rafael Espindola unsigned NumRegularSections = Asm.size(); 97771859c640f6a36251aca223fd503c58dc314e296Rafael Espindola 97838738bf1a847292003a5495f17e42a75d1274bf7Rafael Espindola // We construct .shstrtab, .symtab and .strtab in this order to match gnu as. 97971859c640f6a36251aca223fd503c58dc314e296Rafael Espindola const MCSection *ShstrtabSection; 98071859c640f6a36251aca223fd503c58dc314e296Rafael Espindola ShstrtabSection = Ctx.getELFSection(".shstrtab", ELF::SHT_STRTAB, 0, 98171859c640f6a36251aca223fd503c58dc314e296Rafael Espindola SectionKind::getReadOnly(), false); 98271859c640f6a36251aca223fd503c58dc314e296Rafael Espindola MCSectionData &ShstrtabSD = Asm.getOrCreateSectionData(*ShstrtabSection); 98371859c640f6a36251aca223fd503c58dc314e296Rafael Espindola ShstrtabSD.setAlignment(1); 98471859c640f6a36251aca223fd503c58dc314e296Rafael Espindola ShstrtabIndex = Asm.size(); 98571859c640f6a36251aca223fd503c58dc314e296Rafael Espindola 9863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SymtabSection = Ctx.getELFSection(".symtab", ELF::SHT_SYMTAB, 0, 9873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionKind::getReadOnly(), 9883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming false, EntrySize); 9893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSectionData &SymtabSD = Asm.getOrCreateSectionData(*SymtabSection); 9903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SymtabSD.setAlignment(Is64Bit ? 8 : 4); 9913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSection *StrtabSection; 9933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StrtabSection = Ctx.getELFSection(".strtab", ELF::SHT_STRTAB, 0, 9943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionKind::getReadOnly(), false); 9953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSectionData &StrtabSD = Asm.getOrCreateSectionData(*StrtabSection); 9963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StrtabSD.setAlignment(1); 9973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StringTableIndex = Asm.size(); 9983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 999c3c413f63117896f186fc4385bdaac0578d3613fRafael Espindola WriteRelocations(Asm, Layout); 100071859c640f6a36251aca223fd503c58dc314e296Rafael Espindola 100171859c640f6a36251aca223fd503c58dc314e296Rafael Espindola // Symbol table 100271859c640f6a36251aca223fd503c58dc314e296Rafael Espindola F = new MCDataFragment(&SymtabSD); 100371859c640f6a36251aca223fd503c58dc314e296Rafael Espindola WriteSymbolTable(F, Asm, Layout, NumRegularSections); 10047070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola Asm.AddSectionToTheEnd(*Writer, SymtabSD, Layout); 100571859c640f6a36251aca223fd503c58dc314e296Rafael Espindola 10063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F = new MCDataFragment(&StrtabSD); 10073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents().append(StringTable.begin(), StringTable.end()); 10087070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola Asm.AddSectionToTheEnd(*Writer, StrtabSD, Layout); 10093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F = new MCDataFragment(&ShstrtabSD); 10113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Section header string table. 10133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 10143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // The first entry of a string table holds a null character so skip 10153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // section 0. 10163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Index = 1; 10173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += '\x00'; 10183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 10203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 10213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionELF &Section = 1022368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer static_cast<const MCSectionELF&>(it->getSection()); 102351efe7a253190b672519e8388ce5d45f1dcf1a24Rafael Espindola // FIXME: We could merge suffixes like in .text and .rela.text. 10243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Remember the index into the string table so we can write it 10263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // into the sh_name field of the section header table. 10273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionStringTableIndex[&it->getSection()] = Index; 10283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Index += Section.getSectionName().size() + 1; 10303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += Section.getSectionName(); 10313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += '\x00'; 10323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 10333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10347070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola Asm.AddSectionToTheEnd(*Writer, ShstrtabSD, Layout); 10357070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola} 10367070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 10377070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindolabool ELFObjectWriterImpl::IsFixupFullyResolved(const MCAssembler &Asm, 10387070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCValue Target, 10397070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola bool IsPCRel, 10407070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCFragment *DF) const { 10417070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola // If this is a PCrel relocation, find the section this fixup value is 10427070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola // relative to. 10437070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSection *BaseSection = 0; 10447070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (IsPCRel) { 10457070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola BaseSection = &DF->getParent()->getSection(); 10467070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola assert(BaseSection); 10477070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola } 10487070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 10497070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSection *SectionA = 0; 10507070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSymbol *SymbolA = 0; 10517070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (const MCSymbolRefExpr *A = Target.getSymA()) { 10527070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola SymbolA = &A->getSymbol(); 10537070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola SectionA = &SymbolA->getSection(); 10547070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola } 10557070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 10567070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSection *SectionB = 0; 10577070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (const MCSymbolRefExpr *B = Target.getSymB()) { 10587070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola SectionB = &B->getSymbol().getSection(); 10597070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola } 10607070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 10617070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (!BaseSection) 10627070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola return SectionA == SectionB; 10637070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 10647070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCSymbolData &DataA = Asm.getSymbolData(*SymbolA); 10657070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola if (DataA.isExternal()) 10667070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola return false; 10677070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 10687070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola return !SectionB && BaseSection == SectionA; 10693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 10703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10718f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindolavoid ELFObjectWriterImpl::WriteObject(MCAssembler &Asm, 10723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout) { 10738f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola // Compute symbol table information. 10748f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola ComputeSymbolTable(Asm); 10758f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindola 10763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming CreateMetadataSections(const_cast<MCAssembler&>(Asm), 10773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const_cast<MCAsmLayout&>(Layout)); 10783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Add 1 for the null section. 10803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned NumSections = Asm.size() + 1; 1081a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t NaturalAlignment = Is64Bit ? 8 : 4; 1082a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t HeaderSize = Is64Bit ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr); 1083a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t FileOff = HeaderSize; 10843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 10863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 10873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData &SD = *it; 10883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1089a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff = RoundUpToAlignment(FileOff, SD.getAlignment()); 1090a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 10913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Get the size of the section in the output file (including padding). 10923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Size = Layout.getSectionFileSize(&SD); 1093a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 1094a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff += Size; 10953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 10963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1097a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff = RoundUpToAlignment(FileOff, NaturalAlignment); 1098a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 10993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Write out the ELF header ... 1100a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer WriteHeader(FileOff - HeaderSize, NumSections); 1101a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 1102a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff = HeaderSize; 11033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ... then all of the sections ... 11053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming DenseMap<const MCSection*, uint64_t> SectionOffsetMap; 11063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1107d8e0bfe07a7d101eeed7204d1dfcaae17ad51908Rafael Espindola DenseMap<const MCSection*, uint32_t> SectionIndexMap; 110844cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer 110944cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer unsigned Index = 1; 11103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 11113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 1112a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer const MCSectionData &SD = *it; 1113a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 1114a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t Padding = OffsetToAlignment(FileOff, SD.getAlignment()); 1115a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer WriteZeros(Padding); 1116a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff += Padding; 1117a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 11183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Remember the offset into the file for this section. 11193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionOffsetMap[&it->getSection()] = FileOff; 112044cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer SectionIndexMap[&it->getSection()] = Index++; 112144cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer 11223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming FileOff += Layout.getSectionFileSize(&SD); 11233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Asm.WriteSectionData(it, Layout, Writer); 11253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 11263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1127a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer uint64_t Padding = OffsetToAlignment(FileOff, NaturalAlignment); 1128a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer WriteZeros(Padding); 1129a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer FileOff += Padding; 1130a9eadca2fdf48e3228521f25b415b68219bcee31Benjamin Kramer 11313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ... and then the section header table. 11323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Should we align the section header table? 11333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 11343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Null section first. 11353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSecHdrEntry(0, 0, 0, 0, 0, 0, 0, 0, 0, 0); 11363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 11383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 11393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData &SD = *it; 11403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionELF &Section = 11413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming static_cast<const MCSectionELF&>(SD.getSection()); 11423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t sh_link = 0; 11443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t sh_info = 0; 11453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming switch(Section.getType()) { 11473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_DYNAMIC: 11483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_link = SectionStringTableIndex[&it->getSection()]; 11493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_info = 0; 11503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 11513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_REL: 1153f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman case ELF::SHT_RELA: { 11543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSection *SymtabSection; 11553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSection *InfoSection; 11563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SymtabSection = Asm.getContext().getELFSection(".symtab", ELF::SHT_SYMTAB, 0, 11583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionKind::getReadOnly(), 1159f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman false); 116044cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer sh_link = SectionIndexMap[SymtabSection]; 11613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1162377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer // Remove ".rel" and ".rela" prefixes. 1163377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer unsigned SecNameLen = (Section.getType() == ELF::SHT_REL) ? 4 : 5; 1164377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer StringRef SectionName = Section.getSectionName().substr(SecNameLen); 1165377a572d9b92304a0fde4371d726721586c1a5bdBenjamin Kramer 1166f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman InfoSection = Asm.getContext().getELFSection(SectionName, 11673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELF::SHT_PROGBITS, 0, 1168f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman SectionKind::getReadOnly(), 1169f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman false); 117044cbde85badb60c7078e37e14575c15e671521b1Benjamin Kramer sh_info = SectionIndexMap[InfoSection]; 11713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 1172f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman } 11733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_SYMTAB: 11753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_DYNSYM: 11763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_link = StringTableIndex; 11773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_info = LastLocalSymbolIndex; 11783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 11793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_PROGBITS: 11813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_STRTAB: 11823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_NOBITS: 118319dc7faf25e3a8cc37a656b74ebeef3ab976aa8eBenjamin Kramer case ELF::SHT_NULL: 11843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Nothing to do. 11853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 11863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_HASH: 11883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_GROUP: 11893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_SYMTAB_SHNDX: 11903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming default: 11913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(0 && "FIXME: sh_type value not supported!"); 11923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 11933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 11943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 11953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSecHdrEntry(SectionStringTableIndex[&it->getSection()], 11963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Section.getType(), Section.getFlags(), 119771859c640f6a36251aca223fd503c58dc314e296Rafael Espindola 0, 11983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionOffsetMap.lookup(&SD.getSection()), 11993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Layout.getSectionSize(&SD), sh_link, 12003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_info, SD.getAlignment(), 12013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Section.getEntrySize()); 12023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 12033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 12043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12053565a06ebf44a193a8b333cbeff2ee154298d450Matt FlemingELFObjectWriter::ELFObjectWriter(raw_ostream &OS, 12063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool Is64Bit, 12075baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky Triple::OSType OSType, 12083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool IsLittleEndian, 12093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool HasRelocationAddend) 12103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming : MCObjectWriter(OS, IsLittleEndian) 12113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming{ 12125baf79edc067a4b17d024cc10324ac88c17e3e43Roman Divacky Impl = new ELFObjectWriterImpl(this, Is64Bit, HasRelocationAddend, OSType); 12133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 12143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12153565a06ebf44a193a8b333cbeff2ee154298d450Matt FlemingELFObjectWriter::~ELFObjectWriter() { 12163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming delete (ELFObjectWriterImpl*) Impl; 12173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 12183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12193565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm) { 12203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ((ELFObjectWriterImpl*) Impl)->ExecutePostLayoutBinding(Asm); 12213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 12223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12233565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriter::RecordRelocation(const MCAssembler &Asm, 12243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout, 12253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFragment *Fragment, 12263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFixup &Fixup, MCValue Target, 12273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t &FixedValue) { 12283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ((ELFObjectWriterImpl*) Impl)->RecordRelocation(Asm, Layout, Fragment, Fixup, 12293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Target, FixedValue); 12303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 12313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 12327070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindolabool ELFObjectWriter::IsFixupFullyResolved(const MCAssembler &Asm, 12337070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCValue Target, 12347070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola bool IsPCRel, 12357070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola const MCFragment *DF) const { 12367070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola return ((ELFObjectWriterImpl*) Impl)->IsFixupFullyResolved(Asm, Target, 12377070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola IsPCRel, DF); 12387070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola} 12397070387f08f7dc797b554ed8013cba9f8b74121aRafael Espindola 12408f413fa9c00dbaea000ddfe265ab5edd285ea3abRafael Espindolavoid ELFObjectWriter::WriteObject(MCAssembler &Asm, 12413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout) { 12423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ((ELFObjectWriterImpl*) Impl)->WriteObject(Asm, Layout); 12433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 1244