ELFObjectWriter.cpp revision eb97677764beb115c658ac559d3649c6c4068eb9
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" 153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/ADT/STLExtras.h" 163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/ADT/StringMap.h" 173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/ADT/Twine.h" 183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCAssembler.h" 193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCAsmLayout.h" 203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCContext.h" 213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCELFSymbolFlags.h" 223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCExpr.h" 233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCObjectWriter.h" 243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCSectionELF.h" 253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCSymbol.h" 263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/MC/MCValue.h" 273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/Support/Debug.h" 283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/Support/ErrorHandling.h" 293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/Support/ELF.h" 303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "llvm/Target/TargetAsmBackend.h" 313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include "../Target/X86/X86FixupKinds.h" 333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming#include <vector> 353565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingusing namespace llvm; 363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 373565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingnamespace { 383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming class ELFObjectWriterImpl { 403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming static bool isFixupKindX86PCRel(unsigned Kind) { 413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming switch (Kind) { 423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming default: 433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming return false; 443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case X86::reloc_pcrel_1byte: 453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case X86::reloc_pcrel_4byte: 463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case X86::reloc_riprel_4byte: 473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case X86::reloc_riprel_4byte_movq_load: 483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming return true; 493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming static bool isFixupKindX86RIPRel(unsigned Kind) { 533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming return Kind == X86::reloc_riprel_4byte || 543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Kind == X86::reloc_riprel_4byte_movq_load; 553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// ELFSymbolData - Helper struct for containing some precomputed information 593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// on symbols. 603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming struct ELFSymbolData { 613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData *SymbolData; 623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t StringIndex; 633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint32_t SectionIndex; 643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Support lexicographic sorting. 663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool operator<(const ELFSymbolData &RHS) const { 673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const std::string &Name = SymbolData->getSymbol().getName(); 683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming return Name < RHS.SymbolData->getSymbol().getName(); 693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming }; 713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @name Relocation Data 733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @{ 743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming struct ELFRelocationEntry { 763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Make these big enough for both 32-bit and 64-bit 773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t r_offset; 783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t r_info; 793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t r_addend; 803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Support lexicographic sorting. 823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool operator<(const ELFRelocationEntry &RE) const { 833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming return RE.r_offset < r_offset; 843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming }; 863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming llvm::DenseMap<const MCSectionData*, 883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFRelocationEntry> > Relocations; 893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming DenseMap<const MCSection*, uint64_t> SectionStringTableIndex; 903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @} 923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @name Symbol Table Data 933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @{ 943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SmallString<256> StringTable; 963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFSymbolData> LocalSymbolData; 973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFSymbolData> ExternalSymbolData; 983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFSymbolData> UndefinedSymbolData; 993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// @} 1013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFObjectWriter *Writer; 1033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming raw_ostream &OS; 1053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // This holds the current offset into the object file. 1073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming size_t FileOff; 1083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned Is64Bit : 1; 1103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool HasRelocationAddend; 1123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // This holds the symbol table index of the last local symbol. 1143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned LastLocalSymbolIndex; 1153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // This holds the .strtab section index. 1163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned StringTableIndex; 1173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned ShstrtabIndex; 1193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming public: 1213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFObjectWriterImpl(ELFObjectWriter *_Writer, bool _Is64Bit, 1223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool _HasRelAddend) 1233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming : Writer(_Writer), OS(Writer->getStream()), FileOff(0), 1243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Is64Bit(_Is64Bit), HasRelocationAddend(_HasRelAddend) { 1253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void Write8(uint8_t Value) { Writer->Write8(Value); } 1283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void Write16(uint16_t Value) { Writer->Write16(Value); } 1293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void Write32(uint32_t Value) { Writer->Write32(Value); } 1303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void Write64(uint64_t Value) { Writer->Write64(Value); } 1313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteZeros(unsigned N) { Writer->WriteZeros(N); } 1323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteBytes(StringRef Str, unsigned ZeroFillSize = 0) { 1333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Writer->WriteBytes(Str, ZeroFillSize); 1343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteWord(uint64_t W) { 1373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Is64Bit) { 1383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Writer->Write64(W); 1393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 1403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Writer->Write32(W); 1413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void String8(char *buf, uint8_t Value) { 1453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[0] = Value; 1463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringLE16(char *buf, uint16_t Value) { 1493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[0] = char(Value >> 0); 1503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[1] = char(Value >> 8); 1513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringLE32(char *buf, uint32_t Value) { 1543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[0] = char(Value >> 0); 1553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[1] = char(Value >> 8); 1563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[2] = char(Value >> 16); 1573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[3] = char(Value >> 24); 1583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringLE64(char *buf, uint64_t Value) { 1613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[0] = char(Value >> 0); 1623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[1] = char(Value >> 8); 1633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[2] = char(Value >> 16); 1643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[3] = char(Value >> 24); 1653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[4] = char(Value >> 32); 1663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[5] = char(Value >> 40); 1673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[6] = char(Value >> 48); 1683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[7] = char(Value >> 56); 1693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringBE16(char *buf ,uint16_t Value) { 1723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[0] = char(Value >> 8); 1733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[1] = char(Value >> 0); 1743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringBE32(char *buf, uint32_t Value) { 1773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[0] = char(Value >> 24); 1783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[1] = char(Value >> 16); 1793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[2] = char(Value >> 8); 1803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[3] = char(Value >> 0); 1813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void StringBE64(char *buf, uint64_t Value) { 1843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[0] = char(Value >> 56); 1853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[1] = char(Value >> 48); 1863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[2] = char(Value >> 40); 1873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[3] = char(Value >> 32); 1883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[4] = char(Value >> 24); 1893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[5] = char(Value >> 16); 1903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[6] = char(Value >> 8); 1913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming buf[7] = char(Value >> 0); 1923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 1933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 1943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void String16(char *buf, uint16_t Value) { 1953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Writer->isLittleEndian()) 196f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringLE16(buf, Value); 1973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming else 198f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringBE16(buf, Value); 1993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void String32(char *buf, uint32_t Value) { 2023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Writer->isLittleEndian()) 203f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringLE32(buf, Value); 2043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming else 205f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringBE32(buf, Value); 2063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void String64(char *buf, uint64_t Value) { 2093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Writer->isLittleEndian()) 210f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringLE64(buf, Value); 2113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming else 212f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringBE64(buf, Value); 2133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteHeader(uint64_t SectionDataSize, unsigned NumberOfSections); 2163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteSymbolEntry(MCDataFragment *F, uint64_t name, uint8_t info, 2183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t value, uint64_t size, 2193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint8_t other, uint16_t shndx); 2203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteSymbol(MCDataFragment *F, ELFSymbolData &MSD, 2223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout); 2233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteSymbolTable(MCDataFragment *F, const MCAssembler &Asm, 2253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout); 2263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void RecordRelocation(const MCAssembler &Asm, const MCAsmLayout &Layout, 2283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFragment *Fragment, const MCFixup &Fixup, 2293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCValue Target, uint64_t &FixedValue); 2303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // XXX-PERF: this should be cached 2323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t getNumOfLocalSymbols(const MCAssembler &Asm) { 2333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<const MCSymbol*> Local; 2343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Index = 0; 2363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_symbol_iterator it = Asm.symbol_begin(), 2373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.symbol_end(); it != ie; ++it) { 2383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSymbol &Symbol = it->getSymbol(); 2393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Ignore non-linker visible symbols. 2413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (!Asm.isSymbolLinkerVisible(Symbol)) 2423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming continue; 2433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (it->isExternal() || Symbol.isUndefined()) 2453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming continue; 2463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Index++; 2483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming return Index; 2513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t getSymbolIndexInSymbolTable(MCAssembler &Asm, const MCSymbol *S); 2543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// ComputeSymbolTable - Compute the symbol table data 2563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// 2573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// \param StringTable [out] - The string table data. 2583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// \param StringIndexMap [out] - Map from symbol names to offsets in the 2593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming /// string table. 2603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void ComputeSymbolTable(MCAssembler &Asm); 2613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout, 2633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData &SD); 2643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteRelocations(MCAssembler &Asm, MCAsmLayout &Layout) { 2663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 2673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 2683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteRelocation(Asm, Layout, *it); 2693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 2713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void CreateMetadataSections(MCAssembler &Asm, MCAsmLayout &Layout); 2733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void ExecutePostLayoutBinding(MCAssembler &Asm) {} 2753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteSecHdrEntry(uint32_t Name, uint32_t Type, uint64_t Flags, 2773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Address, uint64_t Offset, 2783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Size, uint32_t Link, uint32_t Info, 2793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Alignment, uint64_t EntrySize); 2803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteRelocationsFragment(const MCAssembler &Asm, MCDataFragment *F, 2823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData *SD); 2833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming void WriteObject(const MCAssembler &Asm, const MCAsmLayout &Layout); 2853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming }; 2863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 2883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 2893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// Emit the ELF header. 2903565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteHeader(uint64_t SectionDataSize, 2913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned NumberOfSections) { 2923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ELF Header 2933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ---------- 2943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 2953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Note 2963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ---- 2973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // emitWord method behaves differently for ELF32 and ELF64, writing 2983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 4 bytes in the former and 8 in the latter. 2993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(0x7f); // e_ident[EI_MAG0] 3013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8('E'); // e_ident[EI_MAG1] 3023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8('L'); // e_ident[EI_MAG2] 3033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8('F'); // e_ident[EI_MAG3] 3043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(Is64Bit ? ELF::ELFCLASS64 : ELF::ELFCLASS32); // e_ident[EI_CLASS] 3063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_ident[EI_DATA] 3083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(Writer->isLittleEndian() ? ELF::ELFDATA2LSB : ELF::ELFDATA2MSB); 3093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(ELF::EV_CURRENT); // e_ident[EI_VERSION] 3113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(ELF::ELFOSABI_LINUX); // e_ident[EI_OSABI] 3123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write8(0); // e_ident[EI_ABIVERSION] 3133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteZeros(ELF::EI_NIDENT - ELF::EI_PAD); 3153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(ELF::ET_REL); // e_type 3173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // FIXME: Make this configurable 319eb97677764beb115c658ac559d3649c6c4068eb9Benjamin Kramer Write16(Is64Bit ? ELF::EM_X86_64 : ELF::EM_386); // e_machine = target 3203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(ELF::EV_CURRENT); // e_version 3223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(0); // e_entry, no entry point in .o file 3233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(0); // e_phoff, no program header for .o 324eb97677764beb115c658ac559d3649c6c4068eb9Benjamin Kramer WriteWord(SectionDataSize + (Is64Bit ? sizeof(ELF::Elf64_Ehdr) : 325eb97677764beb115c658ac559d3649c6c4068eb9Benjamin Kramer sizeof(ELF::Elf32_Ehdr))); // e_shoff = sec hdr table off in bytes 3263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // FIXME: Make this configurable. 3283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(0); // e_flags = whatever the target wants 3293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_ehsize = ELF header size 3313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(Is64Bit ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr)); 3323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(0); // e_phentsize = prog header entry size 3343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(0); // e_phnum = # prog header entries = 0 3353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_shentsize = Section header entry size 3373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(Is64Bit ? sizeof(ELF::Elf64_Shdr) : sizeof(ELF::Elf32_Shdr)); 3383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_shnum = # of section header ents 3403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(NumberOfSections); 3413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // e_shstrndx = Section # of '.shstrtab' 3433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write16(ShstrtabIndex); 3443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 3453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3463565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteSymbolEntry(MCDataFragment *F, uint64_t name, 3473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint8_t info, uint64_t value, 3483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t size, uint8_t other, 3493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint16_t shndx) { 3503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Is64Bit) { 3513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming char buf[8]; 3523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String32(buf, name); 3543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 4); // st_name 3553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String8(buf, info); 3573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 1); // st_info 358368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer 3593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String8(buf, other); 3603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 1); // st_other 3613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String16(buf, shndx); 3633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 2); // st_shndx 3643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String64(buf, value); 3663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 8); // st_value 3673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String64(buf, size); 3693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 8); // st_size 3703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 3713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming char buf[4]; 3723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String32(buf, name); 3743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 4); // st_name 3753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String32(buf, value); 3773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 4); // st_value 3783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String32(buf, size); 3803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 4); // st_size 3813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String8(buf, info); 3833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 1); // st_info 3843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String8(buf, other); 3863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 1); // st_other 3873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming String16(buf, shndx); 3893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += StringRef(buf, 2); // st_shndx 3903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 3913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 3923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 3933565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteSymbol(MCDataFragment *F, ELFSymbolData &MSD, 3943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout) { 3953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData &Data = *MSD.SymbolData; 3963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint8_t Info = (Data.getFlags() & 0xff); 3973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint8_t Other = ((Data.getFlags() & 0xf00) >> ELF_STV_Shift); 3983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Value = 0; 3993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Size = 0; 4003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCExpr *ESize; 4013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Data.isCommon() && Data.isExternal()) 4033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Value = Data.getCommonAlignment(); 4043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ESize = Data.getSize(); 4063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Data.getSize()) { 4073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCValue Res; 4083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (ESize->getKind() == MCExpr::Binary) { 4093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCBinaryExpr *BE = static_cast<const MCBinaryExpr *>(ESize); 4103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (BE->EvaluateAsRelocatable(Res, &Layout)) { 4123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData &A = 4133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Layout.getAssembler().getSymbolData(Res.getSymA()->getSymbol()); 4143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData &B = 4153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Layout.getAssembler().getSymbolData(Res.getSymB()->getSymbol()); 4163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Size = Layout.getSymbolAddress(&A) - Layout.getSymbolAddress(&B); 4183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Value = Layout.getSymbolAddress(&Data); 4193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 4203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else if (ESize->getKind() == MCExpr::Constant) { 421368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer Size = static_cast<const MCConstantExpr *>(ESize)->getValue(); 4223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 4233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(0 && "Unsupported size expression"); 4243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 4253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 4263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Write out the symbol table entry 4283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSymbolEntry(F, MSD.StringIndex, Info, Value, 4293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Size, Other, MSD.SectionIndex); 4303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 4313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4323565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteSymbolTable(MCDataFragment *F, 4333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAssembler &Asm, 4343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout) { 4353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // The string table must be emitted first because we need the index 4363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // into the string table for all the symbol names. 4373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(StringTable.size() && "Missing string table"); 4383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // FIXME: Make sure the start of the symbol table is aligned. 4403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // The first entry is the undefined symbol entry. 4423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned EntrySize = Is64Bit ? ELF::SYMENTRY_SIZE64 : ELF::SYMENTRY_SIZE32; 443368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer F->getContents().append(EntrySize, '\x00'); 4443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Write the symbol table entries. 4463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LastLocalSymbolIndex = LocalSymbolData.size() + 1; 4473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = LocalSymbolData.size(); i != e; ++i) { 4483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData &MSD = LocalSymbolData[i]; 4493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSymbol(F, MSD, Layout); 4503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 4513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Write out a symbol table entry for each section. 453a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman // leaving out the just added .symtab which is at 454a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman // the very end 455a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman unsigned Index = 1; 456a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman for (MCAssembler::const_iterator it = Asm.begin(), 457a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman ie = Asm.end(); it != ie; ++it, ++Index) { 458a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman const MCSectionELF &Section = 459368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer static_cast<const MCSectionELF&>(it->getSection()); 460a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman // Leave out relocations so we don't have indexes within 461a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman // the relocations messed up 462a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman if (Section.getType() == ELF::SHT_RELA) 463a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman continue; 464a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman if (Index == Asm.size()) 465a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman continue; 4663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSymbolEntry(F, 0, ELF::STT_SECTION, 0, 0, ELF::STV_DEFAULT, Index); 467a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman LastLocalSymbolIndex++; 468a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman } 4693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = ExternalSymbolData.size(); i != e; ++i) { 4713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData &MSD = ExternalSymbolData[i]; 4723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData &Data = *MSD.SymbolData; 4733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert((Data.getFlags() & ELF_STB_Global) && 4743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming "External symbol requires STB_GLOBAL flag"); 4753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSymbol(F, MSD, Layout); 4763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Data.getFlags() & ELF_STB_Local) 4773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LastLocalSymbolIndex++; 4783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 4793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i) { 4813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData &MSD = UndefinedSymbolData[i]; 4823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData &Data = *MSD.SymbolData; 4833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Data.setFlags(Data.getFlags() | ELF_STB_Global); 4843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSymbol(F, MSD, Layout); 4853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Data.getFlags() & ELF_STB_Local) 4863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LastLocalSymbolIndex++; 4873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 4883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 4893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 4903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// FIXME: this is currently X86_64 only 4913565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::RecordRelocation(const MCAssembler &Asm, 4923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout, 4933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFragment *Fragment, 4943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFixup &Fixup, 4953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCValue Target, 4963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t &FixedValue) { 4973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned IsPCRel = isFixupKindX86PCRel(Fixup.getKind()); 4983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFRelocationEntry ERE; 4993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming struct ELF::Elf64_Rela ERE64; 5003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t FixupOffset = 5023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Layout.getFragmentOffset(Fragment) + Fixup.getOffset(); 5033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming int64_t Value; 5043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming int64_t Addend = 0; 5053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned Index = 0; 5063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned Type; 5073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Value = Target.getConstant(); 5093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Target.isAbsolute()) { 5113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Type = ELF::R_X86_64_NONE; 5123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Index = 0; 5133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 5143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSymbol *Symbol = &Target.getSymA()->getSymbol(); 5153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSymbolData &SD = Asm.getSymbolData(*Symbol); 5163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSymbolData *Base = Asm.getAtom(Layout, &SD); 5173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Base) { 5193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Index = getSymbolIndexInSymbolTable(const_cast<MCAssembler &>(Asm), &Base->getSymbol()); 5203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Base != &SD) 5213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Value += Layout.getSymbolAddress(&SD) - Layout.getSymbolAddress(Base); 5223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Addend = Value; 5233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Value = 0; 5243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 5253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCFragment *F = SD.getFragment(); 5263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (F) { 5273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Index of the section in .symtab against this symbol 5283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // is being relocated + 2 (empty section + abs. symbols). 5293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Index = SD.getFragment()->getParent()->getOrdinal() + 5303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming getNumOfLocalSymbols(Asm) + 1; 5313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSectionData *FSD = F->getParent(); 5333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Offset of the symbol in the section 5343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Addend = Layout.getSymbolAddress(&SD) - Layout.getSectionAddress(FSD); 5353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 5363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming FixedValue = Value; 5373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming return; 5383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // determine the type of the relocation 5433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (IsPCRel) { 5443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Type = ELF::R_X86_64_PC32; 5453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 5461f8aa7bf08783a438ee2afd3747477923d87b365Benjamin Kramer switch ((unsigned)Fixup.getKind()) { 5471f8aa7bf08783a438ee2afd3747477923d87b365Benjamin Kramer default: llvm_unreachable("invalid fixup kind!"); 5483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case FK_Data_8: Type = ELF::R_X86_64_64; break; 5493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case X86::reloc_pcrel_4byte: 5503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case FK_Data_4: 5513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // check that the offset fits within a signed long 5521f8aa7bf08783a438ee2afd3747477923d87b365Benjamin Kramer if (isInt<32>(Target.getConstant())) 5533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Type = ELF::R_X86_64_32S; 5543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming else 5553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Type = ELF::R_X86_64_32; 5563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 5573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case FK_Data_2: Type = ELF::R_X86_64_16; break; 5583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case X86::reloc_pcrel_1byte: 5593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case FK_Data_1: 5603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Type = ELF::R_X86_64_8; 5613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 5623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 5643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming FixedValue = Value; 5663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ERE64.setSymbolAndType(Index, Type); 5683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ERE.r_offset = FixupOffset; 5703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ERE.r_info = ERE64.r_info; 5713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (HasRelocationAddend) 5723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ERE.r_addend = Addend; 573172d7d6a12b313dd5a8c1588b8f6bd49b1ce16b6Benjamin Kramer else 574172d7d6a12b313dd5a8c1588b8f6bd49b1ce16b6Benjamin Kramer ERE.r_addend = 0; // Silence compiler warning. 5753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Relocations[Fragment->getParent()].push_back(ERE); 5773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 5783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming// XXX-PERF: this should be cached 5803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleminguint64_t ELFObjectWriterImpl::getSymbolIndexInSymbolTable(MCAssembler &Asm, 5813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSymbol *S) { 5823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFSymbolData> Local; 5833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFSymbolData> External; 5843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFSymbolData> Undefined; 5853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::symbol_iterator it = Asm.symbol_begin(), 5873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.symbol_end(); it != ie; ++it) { 5883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSymbol &Symbol = it->getSymbol(); 5893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Ignore non-linker visible symbols. 5913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (!Asm.isSymbolLinkerVisible(Symbol)) 5923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming continue; 5933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (it->isExternal() || Symbol.isUndefined()) 5953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming continue; 5963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 5973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData MSD; 5983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MSD.SymbolData = it; 5993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Local.push_back(MSD); 6013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 6023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::symbol_iterator it = Asm.symbol_begin(), 6033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.symbol_end(); it != ie; ++it) { 6043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSymbol &Symbol = it->getSymbol(); 6053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Ignore non-linker visible symbols. 6073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (!Asm.isSymbolLinkerVisible(Symbol)) 6083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming continue; 6093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (!it->isExternal() && !Symbol.isUndefined()) 6113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming continue; 6123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData MSD; 6143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MSD.SymbolData = it; 6153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 616368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer if (Symbol.isUndefined()) 6173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Undefined.push_back(MSD); 618368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer else 6193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming External.push_back(MSD); 6203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 6213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(Local.begin(), Local.end()); 6233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(External.begin(), External.end()); 6243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(Undefined.begin(), Undefined.end()); 6253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = Local.size(); i != e; ++i) 6273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (&Local[i].SymbolData->getSymbol() == S) 6283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming return i + /* empty symbol */ 1; 6293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = External.size(); i != e; ++i) 6303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (&External[i].SymbolData->getSymbol() == S) 631a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman return i + Local.size() + Asm.size() + /* empty symbol */ 1; 6323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = Undefined.size(); i != e; ++i) 6333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (&Undefined[i].SymbolData->getSymbol() == S) 634a44fa2473a5f2a13730d44e0aea8897b5656b555Eli Friedman return i + Local.size() + External.size() + Asm.size() + /* empty symbol */ 1; 635f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman 636f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman llvm_unreachable("Cannot find symbol which should exist!"); 6373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 6383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6393565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::ComputeSymbolTable(MCAssembler &Asm) { 6403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Build section lookup table. 6413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming DenseMap<const MCSection*, uint8_t> SectionIndexMap; 6423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned Index = 1; 6433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::iterator it = Asm.begin(), 6443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it, ++Index) 6453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionIndexMap[&it->getSection()] = Index; 6463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Index 0 is always the empty string. 6483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StringMap<uint64_t> StringIndexMap; 6493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StringTable += '\x00'; 6503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Add the data for local symbols. 6523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::symbol_iterator it = Asm.symbol_begin(), 6533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.symbol_end(); it != ie; ++it) { 6543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSymbol &Symbol = it->getSymbol(); 6553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Ignore non-linker visible symbols. 6573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (!Asm.isSymbolLinkerVisible(Symbol)) 6583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming continue; 6593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (it->isExternal() || Symbol.isUndefined()) 6613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming continue; 6623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t &Entry = StringIndexMap[Symbol.getName()]; 6643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (!Entry) { 6653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Entry = StringTable.size(); 6663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StringTable += Symbol.getName(); 6673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StringTable += '\x00'; 6683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 6693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData MSD; 6713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MSD.SymbolData = it; 6723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MSD.StringIndex = Entry; 6733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Symbol.isAbsolute()) { 6753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MSD.SectionIndex = ELF::SHN_ABS; 6763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LocalSymbolData.push_back(MSD); 6773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 6783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MSD.SectionIndex = SectionIndexMap.lookup(&Symbol.getSection()); 6793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(MSD.SectionIndex && "Invalid section index!"); 6803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LocalSymbolData.push_back(MSD); 6813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 6823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 6833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Now add non-local symbols. 6853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::symbol_iterator it = Asm.symbol_begin(), 6863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.symbol_end(); it != ie; ++it) { 6873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSymbol &Symbol = it->getSymbol(); 6883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Ignore non-linker visible symbols. 6903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (!Asm.isSymbolLinkerVisible(Symbol)) 6913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming continue; 6923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (!it->isExternal() && !Symbol.isUndefined()) 6943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming continue; 6953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 6963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t &Entry = StringIndexMap[Symbol.getName()]; 6973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (!Entry) { 6983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Entry = StringTable.size(); 6993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StringTable += Symbol.getName(); 7003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StringTable += '\x00'; 7013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 7023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 7033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFSymbolData MSD; 7043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MSD.SymbolData = it; 7053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MSD.StringIndex = Entry; 7063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 7073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (Symbol.isUndefined()) { 7083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MSD.SectionIndex = ELF::SHN_UNDEF; 7093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // XXX: for some reason we dont Emit* this 7103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming it->setFlags(it->getFlags() | ELF_STB_Global); 7113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming UndefinedSymbolData.push_back(MSD); 7123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else if (Symbol.isAbsolute()) { 7133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MSD.SectionIndex = ELF::SHN_ABS; 7143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ExternalSymbolData.push_back(MSD); 7153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else if (it->isCommon()) { 7163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MSD.SectionIndex = ELF::SHN_COMMON; 7173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ExternalSymbolData.push_back(MSD); 7183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } else { 7193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MSD.SectionIndex = SectionIndexMap.lookup(&Symbol.getSection()); 7203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(MSD.SectionIndex && "Invalid section index!"); 7213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ExternalSymbolData.push_back(MSD); 7223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 7233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 7243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 7253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Symbols are required to be in lexicographic order. 7263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(LocalSymbolData.begin(), LocalSymbolData.end()); 7273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(ExternalSymbolData.begin(), ExternalSymbolData.end()); 7283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(UndefinedSymbolData.begin(), UndefinedSymbolData.end()); 7293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 7303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Set the symbol indices. Local symbols must come before all other 7313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // symbols with non-local bindings. 7323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Index = 0; 7333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = LocalSymbolData.size(); i != e; ++i) 7343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming LocalSymbolData[i].SymbolData->setIndex(Index++); 7353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = ExternalSymbolData.size(); i != e; ++i) 7363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ExternalSymbolData[i].SymbolData->setIndex(Index++); 7373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = UndefinedSymbolData.size(); i != e; ++i) 7383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming UndefinedSymbolData[i].SymbolData->setIndex(Index++); 7393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 7403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 7413565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteRelocation(MCAssembler &Asm, MCAsmLayout &Layout, 7423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData &SD) { 7433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming if (!Relocations[&SD].empty()) { 7443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCContext &Ctx = Asm.getContext(); 7453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSection *RelaSection; 7463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionELF &Section = 7473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming static_cast<const MCSectionELF&>(SD.getSection()); 7483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 7493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const StringRef SectionName = Section.getSectionName(); 7503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::string RelaSectionName = ".rela"; 7513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 7523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming RelaSectionName += SectionName; 7533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned EntrySize = Is64Bit ? ELF::SYMENTRY_SIZE64 : ELF::SYMENTRY_SIZE32; 7543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 7553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming RelaSection = Ctx.getELFSection(RelaSectionName, ELF::SHT_RELA, 0, 7563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionKind::getReadOnly(), 7573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming false, EntrySize); 7583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 7593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSectionData &RelaSD = Asm.getOrCreateSectionData(*RelaSection); 7603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming RelaSD.setAlignment(1); 7613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 7623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCDataFragment *F = new MCDataFragment(&RelaSD); 7633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 7643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteRelocationsFragment(Asm, F, &SD); 7653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 7663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Asm.AddSectionToTheEnd(RelaSD, Layout); 7673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 7683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 7693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 7703565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteSecHdrEntry(uint32_t Name, uint32_t Type, 7713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Flags, uint64_t Address, 7723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Offset, uint64_t Size, 7733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint32_t Link, uint32_t Info, 7743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Alignment, 7753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t EntrySize) { 7763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Name); // sh_name: index into string table 7773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Type); // sh_type 7783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Flags); // sh_flags 7793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Address); // sh_addr 7803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Offset); // sh_offset 7813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Size); // sh_size 7823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Link); // sh_link 7833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Write32(Info); // sh_info 7843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(Alignment); // sh_addralign 7853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteWord(EntrySize); // sh_entsize 7863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 7873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 7883565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteRelocationsFragment(const MCAssembler &Asm, 7893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCDataFragment *F, 7903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData *SD) { 7913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming std::vector<ELFRelocationEntry> &Relocs = Relocations[SD]; 7923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // sort by the r_offset just like gnu as does 7933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming array_pod_sort(Relocs.begin(), Relocs.end()); 7943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 7953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (unsigned i = 0, e = Relocs.size(); i != e; ++i) { 7963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELFRelocationEntry entry = Relocs[e - i - 1]; 7973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 798368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer unsigned WordSize = Is64Bit ? 8 : 4; 799368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer F->getContents() += StringRef((const char *)&entry.r_offset, WordSize); 800368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer F->getContents() += StringRef((const char *)&entry.r_info, WordSize); 8013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 802368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer if (HasRelocationAddend) 803368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer F->getContents() += StringRef((const char *)&entry.r_addend, WordSize); 8043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 8053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 8063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8073565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::CreateMetadataSections(MCAssembler &Asm, 8083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCAsmLayout &Layout) { 8093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCContext &Ctx = Asm.getContext(); 8103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCDataFragment *F; 8113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteRelocations(Asm, Layout); 8133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSection *SymtabSection; 8153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned EntrySize = Is64Bit ? ELF::SYMENTRY_SIZE64 : ELF::SYMENTRY_SIZE32; 8163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SymtabSection = Ctx.getELFSection(".symtab", ELF::SHT_SYMTAB, 0, 8183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionKind::getReadOnly(), 8193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming false, EntrySize); 8203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSectionData &SymtabSD = Asm.getOrCreateSectionData(*SymtabSection); 8223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SymtabSD.setAlignment(Is64Bit ? 8 : 4); 8243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F = new MCDataFragment(&SymtabSD); 8263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Symbol table 8283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSymbolTable(F, Asm, Layout); 8293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Asm.AddSectionToTheEnd(SymtabSD, Layout); 8303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSection *StrtabSection; 8323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StrtabSection = Ctx.getELFSection(".strtab", ELF::SHT_STRTAB, 0, 8333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionKind::getReadOnly(), false); 8343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSectionData &StrtabSD = Asm.getOrCreateSectionData(*StrtabSection); 8363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StrtabSD.setAlignment(1); 8373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // FIXME: This isn't right. If the sections get rearranged this will 8393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // be wrong. We need a proper lookup. 8403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming StringTableIndex = Asm.size(); 8413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F = new MCDataFragment(&StrtabSD); 8433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents().append(StringTable.begin(), StringTable.end()); 8443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Asm.AddSectionToTheEnd(StrtabSD, Layout); 8453565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSection *ShstrtabSection; 8473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ShstrtabSection = Ctx.getELFSection(".shstrtab", ELF::SHT_STRTAB, 0, 8483565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionKind::getReadOnly(), false); 8493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming MCSectionData &ShstrtabSD = Asm.getOrCreateSectionData(*ShstrtabSection); 8513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ShstrtabSD.setAlignment(1); 8523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F = new MCDataFragment(&ShstrtabSD); 8543565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // FIXME: This isn't right. If the sections get rearranged this will 8563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // be wrong. We need a proper lookup. 8573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ShstrtabIndex = Asm.size(); 8583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8593565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Section header string table. 8603565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 8613565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // The first entry of a string table holds a null character so skip 8623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // section 0. 8633565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Index = 1; 8643565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += '\x00'; 8653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 8673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 8683565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionELF &Section = 869368ae7e4ec0cc0dfc404fa1d07cdf94a7f2a15beBenjamin Kramer static_cast<const MCSectionELF&>(it->getSection()); 8703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Remember the index into the string table so we can write it 8723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // into the sh_name field of the section header table. 8733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionStringTableIndex[&it->getSection()] = Index; 8743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Index += Section.getSectionName().size() + 1; 8763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += Section.getSectionName(); 8773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming F->getContents() += '\x00'; 8783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 8793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Asm.AddSectionToTheEnd(ShstrtabSD, Layout); 8813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 8823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8833565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriterImpl::WriteObject(const MCAssembler &Asm, 8843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout) { 8853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Compute symbol table information. 8863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ComputeSymbolTable(const_cast<MCAssembler&>(Asm)); 8873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming CreateMetadataSections(const_cast<MCAssembler&>(Asm), 8893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const_cast<MCAsmLayout&>(Layout)); 8903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Add 1 for the null section. 8923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming unsigned NumSections = Asm.size() + 1; 8933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t SectionDataSize = 0; 8953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 8963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 8973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 8983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData &SD = *it; 8993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9003565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Get the size of the section in the output file (including padding). 9013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t Size = Layout.getSectionFileSize(&SD); 9023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionDataSize += Size; 9033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 9043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Write out the ELF header ... 9063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteHeader(SectionDataSize, NumSections); 9073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming FileOff = Is64Bit ? sizeof(ELF::Elf64_Ehdr) : sizeof(ELF::Elf32_Ehdr); 9083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9093565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ... then all of the sections ... 9103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming DenseMap<const MCSection*, uint64_t> SectionOffsetMap; 9113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 9133565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 9143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Remember the offset into the file for this section. 9153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionOffsetMap[&it->getSection()] = FileOff; 9163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9173565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData &SD = *it; 9183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming FileOff += Layout.getSectionFileSize(&SD); 9193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Asm.WriteSectionData(it, Layout, Writer); 9213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 9223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // ... and then the section header table. 9243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Should we align the section header table? 9253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // 9263565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Null section first. 9273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSecHdrEntry(0, 0, 0, 0, 0, 0, 0, 0, 0, 0); 9283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming for (MCAssembler::const_iterator it = Asm.begin(), 9303565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ie = Asm.end(); it != ie; ++it) { 9313565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData &SD = *it; 9323565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionELF &Section = 9333565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming static_cast<const MCSectionELF&>(SD.getSection()); 9343565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9353565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t sh_link = 0; 9363565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t sh_info = 0; 9373565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9383565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming switch(Section.getType()) { 9393565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_DYNAMIC: 9403565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_link = SectionStringTableIndex[&it->getSection()]; 9413565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_info = 0; 9423565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 9433565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9443565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_REL: 945f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman case ELF::SHT_RELA: { 9463565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSection *SymtabSection; 9473565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSection *InfoSection; 948f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman StringRef SectionName; 9493565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData *SymtabSD; 9503565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCSectionData *InfoSD; 9513565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9523565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SymtabSection = Asm.getContext().getELFSection(".symtab", ELF::SHT_SYMTAB, 0, 9533565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionKind::getReadOnly(), 954f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman false); 9553565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SymtabSD = &Asm.getSectionData(*SymtabSection); 9563565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // we have to count the empty section in too 9573565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_link = SymtabSD->getLayoutOrder() + 1; 9583565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 959f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman SectionName = Section.getSectionName(); 960f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman SectionName = SectionName.slice(5, SectionName.size()); 961f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman InfoSection = Asm.getContext().getELFSection(SectionName, 9623565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ELF::SHT_PROGBITS, 0, 963f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman SectionKind::getReadOnly(), 964f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman false); 9653565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming InfoSD = &Asm.getSectionData(*InfoSection); 9663565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_info = InfoSD->getLayoutOrder() + 1; 9673565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 968f8020a3978b9a56074a3a5f9821c63165e37bff7Eli Friedman } 9693565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9703565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_SYMTAB: 9713565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_DYNSYM: 9723565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_link = StringTableIndex; 9733565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_info = LastLocalSymbolIndex; 9743565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 9753565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9763565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_PROGBITS: 9773565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_STRTAB: 9783565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_NOBITS: 9793565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming // Nothing to do. 9803565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 9813565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9823565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_HASH: 9833565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_GROUP: 9843565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming case ELF::SHT_SYMTAB_SHNDX: 9853565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming default: 9863565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming assert(0 && "FIXME: sh_type value not supported!"); 9873565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming break; 9883565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 9893565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 9903565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming WriteSecHdrEntry(SectionStringTableIndex[&it->getSection()], 9913565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Section.getType(), Section.getFlags(), 9923565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Layout.getSectionAddress(&SD), 9933565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming SectionOffsetMap.lookup(&SD.getSection()), 9943565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Layout.getSectionSize(&SD), sh_link, 9953565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming sh_info, SD.getAlignment(), 9963565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Section.getEntrySize()); 9973565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming } 9983565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 9993565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10003565a06ebf44a193a8b333cbeff2ee154298d450Matt FlemingELFObjectWriter::ELFObjectWriter(raw_ostream &OS, 10013565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool Is64Bit, 10023565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool IsLittleEndian, 10033565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming bool HasRelocationAddend) 10043565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming : MCObjectWriter(OS, IsLittleEndian) 10053565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming{ 10063565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Impl = new ELFObjectWriterImpl(this, Is64Bit, HasRelocationAddend); 10073565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 10083565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10093565a06ebf44a193a8b333cbeff2ee154298d450Matt FlemingELFObjectWriter::~ELFObjectWriter() { 10103565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming delete (ELFObjectWriterImpl*) Impl; 10113565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 10123565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10133565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm) { 10143565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ((ELFObjectWriterImpl*) Impl)->ExecutePostLayoutBinding(Asm); 10153565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 10163565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10173565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriter::RecordRelocation(const MCAssembler &Asm, 10183565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout, 10193565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFragment *Fragment, 10203565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCFixup &Fixup, MCValue Target, 10213565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming uint64_t &FixedValue) { 10223565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ((ELFObjectWriterImpl*) Impl)->RecordRelocation(Asm, Layout, Fragment, Fixup, 10233565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming Target, FixedValue); 10243565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 10253565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming 10263565a06ebf44a193a8b333cbeff2ee154298d450Matt Flemingvoid ELFObjectWriter::WriteObject(const MCAssembler &Asm, 10273565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming const MCAsmLayout &Layout) { 10283565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming ((ELFObjectWriterImpl*) Impl)->WriteObject(Asm, Layout); 10293565a06ebf44a193a8b333cbeff2ee154298d450Matt Fleming} 1030