15ffd83dbSDimitry Andric //===- InputSection.cpp ---------------------------------------------------===// 25ffd83dbSDimitry Andric // 35ffd83dbSDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 45ffd83dbSDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 55ffd83dbSDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 65ffd83dbSDimitry Andric // 75ffd83dbSDimitry Andric //===----------------------------------------------------------------------===// 85ffd83dbSDimitry Andric 95ffd83dbSDimitry Andric #include "InputSection.h" 10*e8d8bef9SDimitry Andric #include "InputFiles.h" 115ffd83dbSDimitry Andric #include "OutputSegment.h" 125ffd83dbSDimitry Andric #include "Symbols.h" 135ffd83dbSDimitry Andric #include "Target.h" 14*e8d8bef9SDimitry Andric #include "Writer.h" 155ffd83dbSDimitry Andric #include "lld/Common/Memory.h" 165ffd83dbSDimitry Andric #include "llvm/Support/Endian.h" 175ffd83dbSDimitry Andric 185ffd83dbSDimitry Andric using namespace llvm; 195ffd83dbSDimitry Andric using namespace llvm::MachO; 205ffd83dbSDimitry Andric using namespace llvm::support; 215ffd83dbSDimitry Andric using namespace lld; 225ffd83dbSDimitry Andric using namespace lld::macho; 235ffd83dbSDimitry Andric 245ffd83dbSDimitry Andric std::vector<InputSection *> macho::inputSections; 255ffd83dbSDimitry Andric 265ffd83dbSDimitry Andric uint64_t InputSection::getFileOffset() const { 275ffd83dbSDimitry Andric return parent->fileOff + outSecFileOff; 285ffd83dbSDimitry Andric } 295ffd83dbSDimitry Andric 30*e8d8bef9SDimitry Andric uint64_t InputSection::getFileSize() const { 31*e8d8bef9SDimitry Andric return isZeroFill(flags) ? 0 : getSize(); 32*e8d8bef9SDimitry Andric } 33*e8d8bef9SDimitry Andric 345ffd83dbSDimitry Andric uint64_t InputSection::getVA() const { return parent->addr + outSecOff; } 355ffd83dbSDimitry Andric 365ffd83dbSDimitry Andric void InputSection::writeTo(uint8_t *buf) { 375ffd83dbSDimitry Andric if (getFileSize() == 0) 385ffd83dbSDimitry Andric return; 395ffd83dbSDimitry Andric 405ffd83dbSDimitry Andric memcpy(buf, data.data(), data.size()); 415ffd83dbSDimitry Andric 425ffd83dbSDimitry Andric for (Reloc &r : relocs) { 43*e8d8bef9SDimitry Andric uint64_t referentVA = 0; 44*e8d8bef9SDimitry Andric if (auto *referentSym = r.referent.dyn_cast<Symbol *>()) { 45*e8d8bef9SDimitry Andric referentVA = 46*e8d8bef9SDimitry Andric target->resolveSymbolVA(buf + r.offset, *referentSym, r.type); 475ffd83dbSDimitry Andric 48*e8d8bef9SDimitry Andric if (isThreadLocalVariables(flags)) { 49*e8d8bef9SDimitry Andric // References from thread-local variable sections are treated as offsets 50*e8d8bef9SDimitry Andric // relative to the start of the thread-local data memory area, which 51*e8d8bef9SDimitry Andric // is initialized via copying all the TLV data sections (which are all 52*e8d8bef9SDimitry Andric // contiguous). 53*e8d8bef9SDimitry Andric if (isa<Defined>(referentSym)) 54*e8d8bef9SDimitry Andric referentVA -= firstTLVDataSection->addr; 555ffd83dbSDimitry Andric } 56*e8d8bef9SDimitry Andric } else if (auto *referentIsec = r.referent.dyn_cast<InputSection *>()) { 57*e8d8bef9SDimitry Andric referentVA = referentIsec->getVA(); 58*e8d8bef9SDimitry Andric } 59*e8d8bef9SDimitry Andric 60*e8d8bef9SDimitry Andric uint64_t referentVal = referentVA + r.addend; 61*e8d8bef9SDimitry Andric if (r.pcrel) 62*e8d8bef9SDimitry Andric referentVal -= getVA() + r.offset; 63*e8d8bef9SDimitry Andric target->relocateOne(buf + r.offset, r, referentVal); 64*e8d8bef9SDimitry Andric } 65*e8d8bef9SDimitry Andric } 66*e8d8bef9SDimitry Andric 67*e8d8bef9SDimitry Andric bool macho::isCodeSection(InputSection *isec) { 68*e8d8bef9SDimitry Andric uint32_t type = isec->flags & MachO::SECTION_TYPE; 69*e8d8bef9SDimitry Andric if (type != S_REGULAR && type != S_COALESCED) 70*e8d8bef9SDimitry Andric return false; 71*e8d8bef9SDimitry Andric 72*e8d8bef9SDimitry Andric uint32_t attr = isec->flags & MachO::SECTION_ATTRIBUTES_USR; 73*e8d8bef9SDimitry Andric if (attr == S_ATTR_PURE_INSTRUCTIONS) 74*e8d8bef9SDimitry Andric return true; 75*e8d8bef9SDimitry Andric 76*e8d8bef9SDimitry Andric if (isec->segname == segment_names::text) 77*e8d8bef9SDimitry Andric return StringSwitch<bool>(isec->name) 78*e8d8bef9SDimitry Andric .Cases("__textcoal_nt", "__StaticInit", true) 79*e8d8bef9SDimitry Andric .Default(false); 80*e8d8bef9SDimitry Andric 81*e8d8bef9SDimitry Andric return false; 82*e8d8bef9SDimitry Andric } 83*e8d8bef9SDimitry Andric 84*e8d8bef9SDimitry Andric std::string lld::toString(const InputSection *isec) { 85*e8d8bef9SDimitry Andric return (toString(isec->file) + ":(" + isec->name + ")").str(); 865ffd83dbSDimitry Andric } 87