forked from OSchip/llvm-project
1077 lines
39 KiB
C++
1077 lines
39 KiB
C++
//===- InputSection.cpp ---------------------------------------------------===//
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//
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// The LLVM Linker
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "InputSection.h"
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#include "Config.h"
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#include "EhFrame.h"
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#include "Error.h"
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#include "InputFiles.h"
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#include "LinkerScript.h"
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#include "Memory.h"
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#include "OutputSections.h"
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#include "Relocations.h"
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#include "SyntheticSections.h"
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#include "Target.h"
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#include "Thunks.h"
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#include "llvm/Object/Decompressor.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Compression.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/Threading.h"
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#include <mutex>
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using namespace llvm;
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using namespace llvm::ELF;
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using namespace llvm::object;
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using namespace llvm::support;
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using namespace llvm::support::endian;
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using namespace llvm::sys;
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using namespace lld;
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using namespace lld::elf;
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std::vector<InputSectionBase *> elf::InputSections;
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// Returns a string to construct an error message.
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std::string lld::toString(const InputSectionBase *Sec) {
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return (toString(Sec->File) + ":(" + Sec->Name + ")").str();
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}
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DenseMap<SectionBase *, int> elf::buildSectionOrder() {
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// Build a map from symbols to their priorities. Symbols that didn't
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// appear in the symbol ordering file have the lowest priority 0.
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// All explicitly mentioned symbols have negative (higher) priorities.
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DenseMap<StringRef, int> SymbolOrder;
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int Priority = -Config->SymbolOrderingFile.size();
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for (StringRef S : Config->SymbolOrderingFile)
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SymbolOrder.insert({S, Priority++});
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// Build a map from sections to their priorities.
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DenseMap<SectionBase *, int> SectionOrder;
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for (InputFile *File : ObjectFiles) {
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for (SymbolBody *Body : File->getSymbols()) {
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auto *D = dyn_cast<DefinedRegular>(Body);
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if (!D || !D->Section)
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continue;
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int &Priority = SectionOrder[D->Section];
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Priority = std::min(Priority, SymbolOrder.lookup(D->getName()));
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}
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}
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return SectionOrder;
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}
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template <class ELFT>
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static ArrayRef<uint8_t> getSectionContents(ObjFile<ELFT> *File,
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const typename ELFT::Shdr *Hdr) {
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if (!File || Hdr->sh_type == SHT_NOBITS)
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return makeArrayRef<uint8_t>(nullptr, Hdr->sh_size);
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return check(File->getObj().getSectionContents(Hdr));
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}
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// Return true if a section with given section flags is live (will never be
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// GCed) by default. If a section can be GCed, this function returns false.
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static bool isLiveByDefault(uint64_t Flags, uint32_t Type) {
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// If GC is enabled, all memory-mapped sections are subject of GC.
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if (!Config->GcSections)
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return true;
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if (Flags & SHF_ALLOC)
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return false;
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// Besides that, relocation sections can also be GCed because their
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// relocation target sections may be GCed. This doesn't really matter
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// in most cases because the linker usually consumes relocation
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// sections instead of emitting them, but -emit-reloc needs this.
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return Type != SHT_REL && Type != SHT_RELA;
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}
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InputSectionBase::InputSectionBase(InputFile *File, uint64_t Flags,
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uint32_t Type, uint64_t Entsize,
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uint32_t Link, uint32_t Info,
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uint32_t Alignment, ArrayRef<uint8_t> Data,
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StringRef Name, Kind SectionKind)
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: SectionBase(SectionKind, Name, Flags, Entsize, Alignment, Type, Info,
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Link),
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File(File), Data(Data), Repl(this) {
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Live = isLiveByDefault(Flags, Type);
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Assigned = false;
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NumRelocations = 0;
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AreRelocsRela = false;
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// The ELF spec states that a value of 0 means the section has
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// no alignment constraits.
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uint32_t V = std::max<uint64_t>(Alignment, 1);
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if (!isPowerOf2_64(V))
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fatal(toString(File) + ": section sh_addralign is not a power of 2");
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this->Alignment = V;
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}
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// Drop SHF_GROUP bit unless we are producing a re-linkable object file.
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// SHF_GROUP is a marker that a section belongs to some comdat group.
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// That flag doesn't make sense in an executable.
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static uint64_t getFlags(uint64_t Flags) {
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Flags &= ~(uint64_t)SHF_INFO_LINK;
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if (!Config->Relocatable)
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Flags &= ~(uint64_t)SHF_GROUP;
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return Flags;
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}
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// GNU assembler 2.24 and LLVM 4.0.0's MC (the newest release as of
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// March 2017) fail to infer section types for sections starting with
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// ".init_array." or ".fini_array.". They set SHT_PROGBITS instead of
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// SHF_INIT_ARRAY. As a result, the following assembler directive
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// creates ".init_array.100" with SHT_PROGBITS, for example.
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//
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// .section .init_array.100, "aw"
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//
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// This function forces SHT_{INIT,FINI}_ARRAY so that we can handle
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// incorrect inputs as if they were correct from the beginning.
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static uint64_t getType(uint64_t Type, StringRef Name) {
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if (Type == SHT_PROGBITS && Name.startswith(".init_array."))
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return SHT_INIT_ARRAY;
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if (Type == SHT_PROGBITS && Name.startswith(".fini_array."))
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return SHT_FINI_ARRAY;
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return Type;
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}
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template <class ELFT>
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InputSectionBase::InputSectionBase(ObjFile<ELFT> *File,
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const typename ELFT::Shdr *Hdr,
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StringRef Name, Kind SectionKind)
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: InputSectionBase(File, getFlags(Hdr->sh_flags),
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getType(Hdr->sh_type, Name), Hdr->sh_entsize,
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Hdr->sh_link, Hdr->sh_info, Hdr->sh_addralign,
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getSectionContents(File, Hdr), Name, SectionKind) {
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// We reject object files having insanely large alignments even though
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// they are allowed by the spec. I think 4GB is a reasonable limitation.
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// We might want to relax this in the future.
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if (Hdr->sh_addralign > UINT32_MAX)
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fatal(toString(File) + ": section sh_addralign is too large");
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}
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size_t InputSectionBase::getSize() const {
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if (auto *S = dyn_cast<SyntheticSection>(this))
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return S->getSize();
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return Data.size();
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}
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uint64_t InputSectionBase::getOffsetInFile() const {
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const uint8_t *FileStart = (const uint8_t *)File->MB.getBufferStart();
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const uint8_t *SecStart = Data.begin();
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return SecStart - FileStart;
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}
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uint64_t SectionBase::getOffset(uint64_t Offset) const {
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switch (kind()) {
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case Output: {
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auto *OS = cast<OutputSection>(this);
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// For output sections we treat offset -1 as the end of the section.
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return Offset == uint64_t(-1) ? OS->Size : Offset;
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}
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case Regular:
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return cast<InputSection>(this)->OutSecOff + Offset;
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case Synthetic: {
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auto *IS = cast<InputSection>(this);
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// For synthetic sections we treat offset -1 as the end of the section.
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return IS->OutSecOff + (Offset == uint64_t(-1) ? IS->getSize() : Offset);
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}
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case EHFrame:
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// The file crtbeginT.o has relocations pointing to the start of an empty
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// .eh_frame that is known to be the first in the link. It does that to
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// identify the start of the output .eh_frame.
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return Offset;
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case Merge:
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const MergeInputSection *MS = cast<MergeInputSection>(this);
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if (InputSection *IS = MS->getParent())
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return IS->OutSecOff + MS->getOffset(Offset);
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return MS->getOffset(Offset);
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}
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llvm_unreachable("invalid section kind");
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}
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OutputSection *SectionBase::getOutputSection() {
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InputSection *Sec;
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if (auto *IS = dyn_cast<InputSection>(this))
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Sec = cast<InputSection>(IS->Repl);
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else if (auto *MS = dyn_cast<MergeInputSection>(this))
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Sec = MS->getParent();
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else if (auto *EH = dyn_cast<EhInputSection>(this))
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Sec = EH->getParent();
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else
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return cast<OutputSection>(this);
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return Sec ? Sec->getParent() : nullptr;
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}
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// Uncompress section contents. Note that this function is called
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// from parallelForEach, so it must be thread-safe.
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void InputSectionBase::uncompress() {
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Decompressor Dec = check(Decompressor::create(Name, toStringRef(Data),
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Config->IsLE, Config->Is64));
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size_t Size = Dec.getDecompressedSize();
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UncompressBuf.reset(new char[Size]());
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if (Error E = Dec.decompress({UncompressBuf.get(), Size}))
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fatal(toString(this) +
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": decompress failed: " + llvm::toString(std::move(E)));
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this->Data = makeArrayRef((uint8_t *)UncompressBuf.get(), Size);
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this->Flags &= ~(uint64_t)SHF_COMPRESSED;
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}
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uint64_t SectionBase::getOffset(const DefinedRegular &Sym) const {
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return getOffset(Sym.Value);
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}
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InputSection *InputSectionBase::getLinkOrderDep() const {
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if ((Flags & SHF_LINK_ORDER) && Link != 0) {
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InputSectionBase *L = File->getSections()[Link];
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if (auto *IS = dyn_cast<InputSection>(L))
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return IS;
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error(
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"Merge and .eh_frame sections are not supported with SHF_LINK_ORDER " +
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toString(L));
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}
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return nullptr;
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}
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// Returns a source location string. Used to construct an error message.
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template <class ELFT>
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std::string InputSectionBase::getLocation(uint64_t Offset) {
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// We don't have file for synthetic sections.
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if (getFile<ELFT>() == nullptr)
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return (Config->OutputFile + ":(" + Name + "+0x" + utohexstr(Offset) + ")")
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.str();
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// First check if we can get desired values from debugging information.
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std::string LineInfo = getFile<ELFT>()->getLineInfo(this, Offset);
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if (!LineInfo.empty())
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return LineInfo;
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// File->SourceFile contains STT_FILE symbol that contains a
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// source file name. If it's missing, we use an object file name.
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std::string SrcFile = getFile<ELFT>()->SourceFile;
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if (SrcFile.empty())
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SrcFile = toString(File);
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// Find a function symbol that encloses a given location.
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for (SymbolBody *B : getFile<ELFT>()->getSymbols())
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if (auto *D = dyn_cast<DefinedRegular>(B))
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if (D->Section == this && D->Type == STT_FUNC)
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if (D->Value <= Offset && Offset < D->Value + D->Size)
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return SrcFile + ":(function " + toString(*D) + ")";
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// If there's no symbol, print out the offset in the section.
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return (SrcFile + ":(" + Name + "+0x" + utohexstr(Offset) + ")").str();
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}
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// Returns a source location string. This function is intended to be
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// used for constructing an error message. The returned message looks
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// like this:
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//
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// foo.c:42 (/home/alice/possibly/very/long/path/foo.c:42)
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//
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// Returns an empty string if there's no way to get line info.
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template <class ELFT> std::string InputSectionBase::getSrcMsg(uint64_t Offset) {
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// Synthetic sections don't have input files.
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ObjFile<ELFT> *File = getFile<ELFT>();
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if (!File)
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return "";
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Optional<DILineInfo> Info = File->getDILineInfo(this, Offset);
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// File->SourceFile contains STT_FILE symbol, and that is a last resort.
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if (!Info)
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return File->SourceFile;
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std::string Path = Info->FileName;
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std::string Filename = path::filename(Path);
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std::string Lineno = ":" + std::to_string(Info->Line);
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if (Filename == Path)
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return Filename + Lineno;
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return Filename + Lineno + " (" + Path + Lineno + ")";
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}
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// Returns a filename string along with an optional section name. This
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// function is intended to be used for constructing an error
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// message. The returned message looks like this:
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//
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// path/to/foo.o:(function bar)
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//
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// or
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//
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// path/to/foo.o:(function bar) in archive path/to/bar.a
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template <class ELFT> std::string InputSectionBase::getObjMsg(uint64_t Off) {
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// Synthetic sections don't have input files.
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ObjFile<ELFT> *File = getFile<ELFT>();
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if (!File)
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return ("(internal):(" + Name + "+0x" + utohexstr(Off) + ")").str();
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std::string Filename = File->getName();
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std::string Archive;
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if (!File->ArchiveName.empty())
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Archive = (" in archive " + File->ArchiveName).str();
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// Find a symbol that encloses a given location.
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for (SymbolBody *B : getFile<ELFT>()->getSymbols())
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if (auto *D = dyn_cast<DefinedRegular>(B))
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if (D->Section == this && D->Value <= Off && Off < D->Value + D->Size)
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return Filename + ":(" + toString(*D) + ")" + Archive;
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// If there's no symbol, print out the offset in the section.
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return (Filename + ":(" + Name + "+0x" + utohexstr(Off) + ")" + Archive)
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.str();
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}
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InputSectionBase InputSectionBase::Discarded;
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InputSection::InputSection(uint64_t Flags, uint32_t Type, uint32_t Alignment,
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ArrayRef<uint8_t> Data, StringRef Name, Kind K)
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: InputSectionBase(nullptr, Flags, Type,
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/*Entsize*/ 0, /*Link*/ 0, /*Info*/ 0, Alignment, Data,
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Name, K) {}
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template <class ELFT>
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InputSection::InputSection(ObjFile<ELFT> *F, const typename ELFT::Shdr *Header,
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StringRef Name)
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: InputSectionBase(F, Header, Name, InputSectionBase::Regular) {}
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bool InputSection::classof(const SectionBase *S) {
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return S->kind() == SectionBase::Regular ||
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S->kind() == SectionBase::Synthetic;
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}
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bool InputSectionBase::classof(const SectionBase *S) {
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return S->kind() != Output;
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}
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OutputSection *InputSection::getParent() const {
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return cast_or_null<OutputSection>(Parent);
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}
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// Copy SHT_GROUP section contents. Used only for the -r option.
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template <class ELFT> void InputSection::copyShtGroup(uint8_t *Buf) {
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// ELFT::Word is the 32-bit integral type in the target endianness.
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typedef typename ELFT::Word u32;
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ArrayRef<u32> From = getDataAs<u32>();
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auto *To = reinterpret_cast<u32 *>(Buf);
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// The first entry is not a section number but a flag.
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*To++ = From[0];
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// Adjust section numbers because section numbers in an input object
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// files are different in the output.
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ArrayRef<InputSectionBase *> Sections = this->File->getSections();
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for (uint32_t Idx : From.slice(1))
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*To++ = Sections[Idx]->getOutputSection()->SectionIndex;
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}
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InputSectionBase *InputSection::getRelocatedSection() {
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assert(this->Type == SHT_RELA || this->Type == SHT_REL);
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ArrayRef<InputSectionBase *> Sections = this->File->getSections();
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return Sections[this->Info];
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}
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// This is used for -r and --emit-relocs. We can't use memcpy to copy
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// relocations because we need to update symbol table offset and section index
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// for each relocation. So we copy relocations one by one.
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template <class ELFT, class RelTy>
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void InputSection::copyRelocations(uint8_t *Buf, ArrayRef<RelTy> Rels) {
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InputSectionBase *RelocatedSection = getRelocatedSection();
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// Loop is slow and have complexity O(N*M), where N - amount of
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// relocations and M - amount of symbols in symbol table.
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// That happens because getSymbolIndex(...) call below performs
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// simple linear search.
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for (const RelTy &Rel : Rels) {
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uint32_t Type = Rel.getType(Config->IsMips64EL);
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SymbolBody &Body = this->getFile<ELFT>()->getRelocTargetSym(Rel);
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auto *P = reinterpret_cast<typename ELFT::Rela *>(Buf);
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Buf += sizeof(RelTy);
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if (Config->IsRela)
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P->r_addend = getAddend<ELFT>(Rel);
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// Output section VA is zero for -r, so r_offset is an offset within the
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// section, but for --emit-relocs it is an virtual address.
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P->r_offset = RelocatedSection->getOutputSection()->Addr +
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RelocatedSection->getOffset(Rel.r_offset);
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P->setSymbolAndType(InX::SymTab->getSymbolIndex(&Body), Type,
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Config->IsMips64EL);
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if (Body.Type == STT_SECTION) {
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// We combine multiple section symbols into only one per
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// section. This means we have to update the addend. That is
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// trivial for Elf_Rela, but for Elf_Rel we have to write to the
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// section data. We do that by adding to the Relocation vector.
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// .eh_frame is horribly special and can reference discarded sections. To
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// avoid having to parse and recreate .eh_frame, we just replace any
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// relocation in it pointing to discarded sections with R_*_NONE, which
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// hopefully creates a frame that is ignored at runtime.
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SectionBase *Section = cast<DefinedRegular>(Body).Section;
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if (Section == &InputSection::Discarded) {
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P->setSymbolAndType(0, 0, false);
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continue;
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}
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if (Config->IsRela) {
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P->r_addend += Body.getVA() - Section->getOutputSection()->Addr;
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} else if (Config->Relocatable) {
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const uint8_t *BufLoc = RelocatedSection->Data.begin() + Rel.r_offset;
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RelocatedSection->Relocations.push_back(
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{R_ABS, Type, Rel.r_offset, Target->getImplicitAddend(BufLoc, Type),
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&Body});
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}
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}
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}
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}
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// The ARM and AArch64 ABI handle pc-relative relocations to undefined weak
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// references specially. The general rule is that the value of the symbol in
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// this context is the address of the place P. A further special case is that
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// branch relocations to an undefined weak reference resolve to the next
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// instruction.
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static uint32_t getARMUndefinedRelativeWeakVA(uint32_t Type, uint32_t A,
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uint32_t P) {
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switch (Type) {
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// Unresolved branch relocations to weak references resolve to next
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// instruction, this will be either 2 or 4 bytes on from P.
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case R_ARM_THM_JUMP11:
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return P + 2 + A;
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case R_ARM_CALL:
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case R_ARM_JUMP24:
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case R_ARM_PC24:
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case R_ARM_PLT32:
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case R_ARM_PREL31:
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case R_ARM_THM_JUMP19:
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case R_ARM_THM_JUMP24:
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return P + 4 + A;
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case R_ARM_THM_CALL:
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|
// We don't want an interworking BLX to ARM
|
|
return P + 5 + A;
|
|
// Unresolved non branch pc-relative relocations
|
|
// R_ARM_TARGET2 which can be resolved relatively is not present as it never
|
|
// targets a weak-reference.
|
|
case R_ARM_MOVW_PREL_NC:
|
|
case R_ARM_MOVT_PREL:
|
|
case R_ARM_REL32:
|
|
case R_ARM_THM_MOVW_PREL_NC:
|
|
case R_ARM_THM_MOVT_PREL:
|
|
return P + A;
|
|
}
|
|
llvm_unreachable("ARM pc-relative relocation expected\n");
|
|
}
|
|
|
|
// The comment above getARMUndefinedRelativeWeakVA applies to this function.
|
|
static uint64_t getAArch64UndefinedRelativeWeakVA(uint64_t Type, uint64_t A,
|
|
uint64_t P) {
|
|
switch (Type) {
|
|
// Unresolved branch relocations to weak references resolve to next
|
|
// instruction, this is 4 bytes on from P.
|
|
case R_AARCH64_CALL26:
|
|
case R_AARCH64_CONDBR19:
|
|
case R_AARCH64_JUMP26:
|
|
case R_AARCH64_TSTBR14:
|
|
return P + 4 + A;
|
|
// Unresolved non branch pc-relative relocations
|
|
case R_AARCH64_PREL16:
|
|
case R_AARCH64_PREL32:
|
|
case R_AARCH64_PREL64:
|
|
case R_AARCH64_ADR_PREL_LO21:
|
|
case R_AARCH64_LD_PREL_LO19:
|
|
return P + A;
|
|
}
|
|
llvm_unreachable("AArch64 pc-relative relocation expected\n");
|
|
}
|
|
|
|
// ARM SBREL relocations are of the form S + A - B where B is the static base
|
|
// The ARM ABI defines base to be "addressing origin of the output segment
|
|
// defining the symbol S". We defined the "addressing origin"/static base to be
|
|
// the base of the PT_LOAD segment containing the Body.
|
|
// The procedure call standard only defines a Read Write Position Independent
|
|
// RWPI variant so in practice we should expect the static base to be the base
|
|
// of the RW segment.
|
|
static uint64_t getARMStaticBase(const SymbolBody &Body) {
|
|
OutputSection *OS = Body.getOutputSection();
|
|
if (!OS || !OS->PtLoad || !OS->PtLoad->FirstSec)
|
|
fatal("SBREL relocation to " + Body.getName() + " without static base");
|
|
return OS->PtLoad->FirstSec->Addr;
|
|
}
|
|
|
|
static uint64_t getRelocTargetVA(uint32_t Type, int64_t A, uint64_t P,
|
|
const SymbolBody &Body, RelExpr Expr) {
|
|
switch (Expr) {
|
|
case R_ABS:
|
|
case R_RELAX_GOT_PC_NOPIC:
|
|
return Body.getVA(A);
|
|
case R_ARM_SBREL:
|
|
return Body.getVA(A) - getARMStaticBase(Body);
|
|
case R_GOT:
|
|
case R_RELAX_TLS_GD_TO_IE_ABS:
|
|
return Body.getGotVA() + A;
|
|
case R_GOTONLY_PC:
|
|
return InX::Got->getVA() + A - P;
|
|
case R_GOTONLY_PC_FROM_END:
|
|
return InX::Got->getVA() + A - P + InX::Got->getSize();
|
|
case R_GOTREL:
|
|
return Body.getVA(A) - InX::Got->getVA();
|
|
case R_GOTREL_FROM_END:
|
|
return Body.getVA(A) - InX::Got->getVA() - InX::Got->getSize();
|
|
case R_GOT_FROM_END:
|
|
case R_RELAX_TLS_GD_TO_IE_END:
|
|
return Body.getGotOffset() + A - InX::Got->getSize();
|
|
case R_GOT_OFF:
|
|
return Body.getGotOffset() + A;
|
|
case R_GOT_PAGE_PC:
|
|
case R_RELAX_TLS_GD_TO_IE_PAGE_PC:
|
|
return getAArch64Page(Body.getGotVA() + A) - getAArch64Page(P);
|
|
case R_GOT_PC:
|
|
case R_RELAX_TLS_GD_TO_IE:
|
|
return Body.getGotVA() + A - P;
|
|
case R_HINT:
|
|
case R_NONE:
|
|
case R_TLSDESC_CALL:
|
|
llvm_unreachable("cannot relocate hint relocs");
|
|
case R_MIPS_GOTREL:
|
|
return Body.getVA(A) - InX::MipsGot->getGp();
|
|
case R_MIPS_GOT_GP:
|
|
return InX::MipsGot->getGp() + A;
|
|
case R_MIPS_GOT_GP_PC: {
|
|
// R_MIPS_LO16 expression has R_MIPS_GOT_GP_PC type iif the target
|
|
// is _gp_disp symbol. In that case we should use the following
|
|
// formula for calculation "AHL + GP - P + 4". For details see p. 4-19 at
|
|
// ftp://www.linux-mips.org/pub/linux/mips/doc/ABI/mipsabi.pdf
|
|
uint64_t V = InX::MipsGot->getGp() + A - P;
|
|
if (Type == R_MIPS_LO16 || Type == R_MICROMIPS_LO16)
|
|
V += 4;
|
|
return V;
|
|
}
|
|
case R_MIPS_GOT_LOCAL_PAGE:
|
|
// If relocation against MIPS local symbol requires GOT entry, this entry
|
|
// should be initialized by 'page address'. This address is high 16-bits
|
|
// of sum the symbol's value and the addend.
|
|
return InX::MipsGot->getVA() + InX::MipsGot->getPageEntryOffset(Body, A) -
|
|
InX::MipsGot->getGp();
|
|
case R_MIPS_GOT_OFF:
|
|
case R_MIPS_GOT_OFF32:
|
|
// In case of MIPS if a GOT relocation has non-zero addend this addend
|
|
// should be applied to the GOT entry content not to the GOT entry offset.
|
|
// That is why we use separate expression type.
|
|
return InX::MipsGot->getVA() + InX::MipsGot->getBodyEntryOffset(Body, A) -
|
|
InX::MipsGot->getGp();
|
|
case R_MIPS_TLSGD:
|
|
return InX::MipsGot->getVA() + InX::MipsGot->getTlsOffset() +
|
|
InX::MipsGot->getGlobalDynOffset(Body) - InX::MipsGot->getGp();
|
|
case R_MIPS_TLSLD:
|
|
return InX::MipsGot->getVA() + InX::MipsGot->getTlsOffset() +
|
|
InX::MipsGot->getTlsIndexOff() - InX::MipsGot->getGp();
|
|
case R_PAGE_PC:
|
|
case R_PLT_PAGE_PC: {
|
|
uint64_t Dest;
|
|
if (Body.isUndefWeak())
|
|
Dest = getAArch64Page(A);
|
|
else
|
|
Dest = getAArch64Page(Body.getVA(A));
|
|
return Dest - getAArch64Page(P);
|
|
}
|
|
case R_PC: {
|
|
uint64_t Dest;
|
|
if (Body.isUndefWeak()) {
|
|
// On ARM and AArch64 a branch to an undefined weak resolves to the
|
|
// next instruction, otherwise the place.
|
|
if (Config->EMachine == EM_ARM)
|
|
Dest = getARMUndefinedRelativeWeakVA(Type, A, P);
|
|
else if (Config->EMachine == EM_AARCH64)
|
|
Dest = getAArch64UndefinedRelativeWeakVA(Type, A, P);
|
|
else
|
|
Dest = Body.getVA(A);
|
|
} else {
|
|
Dest = Body.getVA(A);
|
|
}
|
|
return Dest - P;
|
|
}
|
|
case R_PLT:
|
|
return Body.getPltVA() + A;
|
|
case R_PLT_PC:
|
|
case R_PPC_PLT_OPD:
|
|
return Body.getPltVA() + A - P;
|
|
case R_PPC_OPD: {
|
|
uint64_t SymVA = Body.getVA(A);
|
|
// If we have an undefined weak symbol, we might get here with a symbol
|
|
// address of zero. That could overflow, but the code must be unreachable,
|
|
// so don't bother doing anything at all.
|
|
if (!SymVA)
|
|
return 0;
|
|
if (Out::Opd) {
|
|
// If this is a local call, and we currently have the address of a
|
|
// function-descriptor, get the underlying code address instead.
|
|
uint64_t OpdStart = Out::Opd->Addr;
|
|
uint64_t OpdEnd = OpdStart + Out::Opd->Size;
|
|
bool InOpd = OpdStart <= SymVA && SymVA < OpdEnd;
|
|
if (InOpd)
|
|
SymVA = read64be(&Out::OpdBuf[SymVA - OpdStart]);
|
|
}
|
|
return SymVA - P;
|
|
}
|
|
case R_PPC_TOC:
|
|
return getPPC64TocBase() + A;
|
|
case R_RELAX_GOT_PC:
|
|
return Body.getVA(A) - P;
|
|
case R_RELAX_TLS_GD_TO_LE:
|
|
case R_RELAX_TLS_IE_TO_LE:
|
|
case R_RELAX_TLS_LD_TO_LE:
|
|
case R_TLS:
|
|
// A weak undefined TLS symbol resolves to the base of the TLS
|
|
// block, i.e. gets a value of zero. If we pass --gc-sections to
|
|
// lld and .tbss is not referenced, it gets reclaimed and we don't
|
|
// create a TLS program header. Therefore, we resolve this
|
|
// statically to zero.
|
|
if (Body.isTls() && (Body.isLazy() || Body.isUndefined()) &&
|
|
Body.symbol()->isWeak())
|
|
return 0;
|
|
if (Target->TcbSize)
|
|
return Body.getVA(A) + alignTo(Target->TcbSize, Out::TlsPhdr->p_align);
|
|
return Body.getVA(A) - Out::TlsPhdr->p_memsz;
|
|
case R_RELAX_TLS_GD_TO_LE_NEG:
|
|
case R_NEG_TLS:
|
|
return Out::TlsPhdr->p_memsz - Body.getVA(A);
|
|
case R_SIZE:
|
|
return A; // Body.getSize was already folded into the addend.
|
|
case R_TLSDESC:
|
|
return InX::Got->getGlobalDynAddr(Body) + A;
|
|
case R_TLSDESC_PAGE:
|
|
return getAArch64Page(InX::Got->getGlobalDynAddr(Body) + A) -
|
|
getAArch64Page(P);
|
|
case R_TLSGD:
|
|
return InX::Got->getGlobalDynOffset(Body) + A - InX::Got->getSize();
|
|
case R_TLSGD_PC:
|
|
return InX::Got->getGlobalDynAddr(Body) + A - P;
|
|
case R_TLSLD:
|
|
return InX::Got->getTlsIndexOff() + A - InX::Got->getSize();
|
|
case R_TLSLD_PC:
|
|
return InX::Got->getTlsIndexVA() + A - P;
|
|
}
|
|
llvm_unreachable("Invalid expression");
|
|
}
|
|
|
|
// This function applies relocations to sections without SHF_ALLOC bit.
|
|
// Such sections are never mapped to memory at runtime. Debug sections are
|
|
// an example. Relocations in non-alloc sections are much easier to
|
|
// handle than in allocated sections because it will never need complex
|
|
// treatement such as GOT or PLT (because at runtime no one refers them).
|
|
// So, we handle relocations for non-alloc sections directly in this
|
|
// function as a performance optimization.
|
|
template <class ELFT, class RelTy>
|
|
void InputSection::relocateNonAlloc(uint8_t *Buf, ArrayRef<RelTy> Rels) {
|
|
for (const RelTy &Rel : Rels) {
|
|
uint32_t Type = Rel.getType(Config->IsMips64EL);
|
|
uint64_t Offset = getOffset(Rel.r_offset);
|
|
uint8_t *BufLoc = Buf + Offset;
|
|
int64_t Addend = getAddend<ELFT>(Rel);
|
|
if (!RelTy::IsRela)
|
|
Addend += Target->getImplicitAddend(BufLoc, Type);
|
|
|
|
SymbolBody &Sym = this->getFile<ELFT>()->getRelocTargetSym(Rel);
|
|
RelExpr Expr = Target->getRelExpr(Type, Sym, *File, BufLoc);
|
|
if (Expr == R_NONE)
|
|
continue;
|
|
if (Expr != R_ABS) {
|
|
error(this->getLocation<ELFT>(Offset) + ": has non-ABS reloc");
|
|
return;
|
|
}
|
|
|
|
uint64_t AddrLoc = getParent()->Addr + Offset;
|
|
uint64_t SymVA = 0;
|
|
if (!Sym.isTls() || Out::TlsPhdr)
|
|
SymVA = SignExtend64<sizeof(typename ELFT::uint) * 8>(
|
|
getRelocTargetVA(Type, Addend, AddrLoc, Sym, R_ABS));
|
|
Target->relocateOne(BufLoc, Type, SymVA);
|
|
}
|
|
}
|
|
|
|
template <class ELFT> ObjFile<ELFT> *InputSectionBase::getFile() const {
|
|
return cast_or_null<ObjFile<ELFT>>(File);
|
|
}
|
|
|
|
template <class ELFT>
|
|
void InputSectionBase::relocate(uint8_t *Buf, uint8_t *BufEnd) {
|
|
if (Flags & SHF_ALLOC)
|
|
relocateAlloc(Buf, BufEnd);
|
|
else
|
|
relocateNonAlloc<ELFT>(Buf, BufEnd);
|
|
}
|
|
|
|
template <class ELFT>
|
|
void InputSectionBase::relocateNonAlloc(uint8_t *Buf, uint8_t *BufEnd) {
|
|
// scanReloc function in Writer.cpp constructs Relocations
|
|
// vector only for SHF_ALLOC'ed sections. For other sections,
|
|
// we handle relocations directly here.
|
|
auto *IS = cast<InputSection>(this);
|
|
assert(!(IS->Flags & SHF_ALLOC));
|
|
if (IS->AreRelocsRela)
|
|
IS->relocateNonAlloc<ELFT>(Buf, IS->template relas<ELFT>());
|
|
else
|
|
IS->relocateNonAlloc<ELFT>(Buf, IS->template rels<ELFT>());
|
|
}
|
|
|
|
void InputSectionBase::relocateAlloc(uint8_t *Buf, uint8_t *BufEnd) {
|
|
assert(Flags & SHF_ALLOC);
|
|
const unsigned Bits = Config->Wordsize * 8;
|
|
for (const Relocation &Rel : Relocations) {
|
|
uint64_t Offset = getOffset(Rel.Offset);
|
|
uint8_t *BufLoc = Buf + Offset;
|
|
uint32_t Type = Rel.Type;
|
|
|
|
uint64_t AddrLoc = getOutputSection()->Addr + Offset;
|
|
RelExpr Expr = Rel.Expr;
|
|
uint64_t TargetVA = SignExtend64(
|
|
getRelocTargetVA(Type, Rel.Addend, AddrLoc, *Rel.Sym, Expr), Bits);
|
|
|
|
switch (Expr) {
|
|
case R_RELAX_GOT_PC:
|
|
case R_RELAX_GOT_PC_NOPIC:
|
|
Target->relaxGot(BufLoc, TargetVA);
|
|
break;
|
|
case R_RELAX_TLS_IE_TO_LE:
|
|
Target->relaxTlsIeToLe(BufLoc, Type, TargetVA);
|
|
break;
|
|
case R_RELAX_TLS_LD_TO_LE:
|
|
Target->relaxTlsLdToLe(BufLoc, Type, TargetVA);
|
|
break;
|
|
case R_RELAX_TLS_GD_TO_LE:
|
|
case R_RELAX_TLS_GD_TO_LE_NEG:
|
|
Target->relaxTlsGdToLe(BufLoc, Type, TargetVA);
|
|
break;
|
|
case R_RELAX_TLS_GD_TO_IE:
|
|
case R_RELAX_TLS_GD_TO_IE_ABS:
|
|
case R_RELAX_TLS_GD_TO_IE_PAGE_PC:
|
|
case R_RELAX_TLS_GD_TO_IE_END:
|
|
Target->relaxTlsGdToIe(BufLoc, Type, TargetVA);
|
|
break;
|
|
case R_PPC_PLT_OPD:
|
|
// Patch a nop (0x60000000) to a ld.
|
|
if (BufLoc + 8 <= BufEnd && read32be(BufLoc + 4) == 0x60000000)
|
|
write32be(BufLoc + 4, 0xe8410028); // ld %r2, 40(%r1)
|
|
LLVM_FALLTHROUGH;
|
|
default:
|
|
Target->relocateOne(BufLoc, Type, TargetVA);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
template <class ELFT> void InputSection::writeTo(uint8_t *Buf) {
|
|
if (this->Type == SHT_NOBITS)
|
|
return;
|
|
|
|
if (auto *S = dyn_cast<SyntheticSection>(this)) {
|
|
S->writeTo(Buf + OutSecOff);
|
|
return;
|
|
}
|
|
|
|
// If -r or --emit-relocs is given, then an InputSection
|
|
// may be a relocation section.
|
|
if (this->Type == SHT_RELA) {
|
|
copyRelocations<ELFT>(Buf + OutSecOff,
|
|
this->template getDataAs<typename ELFT::Rela>());
|
|
return;
|
|
}
|
|
if (this->Type == SHT_REL) {
|
|
copyRelocations<ELFT>(Buf + OutSecOff,
|
|
this->template getDataAs<typename ELFT::Rel>());
|
|
return;
|
|
}
|
|
|
|
// If -r is given, we may have a SHT_GROUP section.
|
|
if (this->Type == SHT_GROUP) {
|
|
copyShtGroup<ELFT>(Buf + OutSecOff);
|
|
return;
|
|
}
|
|
|
|
// Copy section contents from source object file to output file
|
|
// and then apply relocations.
|
|
memcpy(Buf + OutSecOff, Data.data(), Data.size());
|
|
uint8_t *BufEnd = Buf + OutSecOff + Data.size();
|
|
this->relocate<ELFT>(Buf, BufEnd);
|
|
}
|
|
|
|
void InputSection::replace(InputSection *Other) {
|
|
this->Alignment = std::max(this->Alignment, Other->Alignment);
|
|
Other->Repl = this->Repl;
|
|
Other->Live = false;
|
|
}
|
|
|
|
template <class ELFT>
|
|
EhInputSection::EhInputSection(ObjFile<ELFT> *F,
|
|
const typename ELFT::Shdr *Header,
|
|
StringRef Name)
|
|
: InputSectionBase(F, Header, Name, InputSectionBase::EHFrame) {
|
|
// Mark .eh_frame sections as live by default because there are
|
|
// usually no relocations that point to .eh_frames. Otherwise,
|
|
// the garbage collector would drop all .eh_frame sections.
|
|
this->Live = true;
|
|
}
|
|
|
|
SyntheticSection *EhInputSection::getParent() const {
|
|
return cast_or_null<SyntheticSection>(Parent);
|
|
}
|
|
|
|
bool EhInputSection::classof(const SectionBase *S) {
|
|
return S->kind() == InputSectionBase::EHFrame;
|
|
}
|
|
|
|
// Returns the index of the first relocation that points to a region between
|
|
// Begin and Begin+Size.
|
|
template <class IntTy, class RelTy>
|
|
static unsigned getReloc(IntTy Begin, IntTy Size, const ArrayRef<RelTy> &Rels,
|
|
unsigned &RelocI) {
|
|
// Start search from RelocI for fast access. That works because the
|
|
// relocations are sorted in .eh_frame.
|
|
for (unsigned N = Rels.size(); RelocI < N; ++RelocI) {
|
|
const RelTy &Rel = Rels[RelocI];
|
|
if (Rel.r_offset < Begin)
|
|
continue;
|
|
|
|
if (Rel.r_offset < Begin + Size)
|
|
return RelocI;
|
|
return -1;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
// .eh_frame is a sequence of CIE or FDE records.
|
|
// This function splits an input section into records and returns them.
|
|
template <class ELFT> void EhInputSection::split() {
|
|
// Early exit if already split.
|
|
if (!this->Pieces.empty())
|
|
return;
|
|
|
|
if (this->NumRelocations) {
|
|
if (this->AreRelocsRela)
|
|
split<ELFT>(this->relas<ELFT>());
|
|
else
|
|
split<ELFT>(this->rels<ELFT>());
|
|
return;
|
|
}
|
|
split<ELFT>(makeArrayRef<typename ELFT::Rela>(nullptr, nullptr));
|
|
}
|
|
|
|
template <class ELFT, class RelTy>
|
|
void EhInputSection::split(ArrayRef<RelTy> Rels) {
|
|
ArrayRef<uint8_t> Data = this->Data;
|
|
unsigned RelI = 0;
|
|
for (size_t Off = 0, End = Data.size(); Off != End;) {
|
|
size_t Size = readEhRecordSize<ELFT>(this, Off);
|
|
this->Pieces.emplace_back(Off, this, Size, getReloc(Off, Size, Rels, RelI));
|
|
// The empty record is the end marker.
|
|
if (Size == 4)
|
|
break;
|
|
Off += Size;
|
|
}
|
|
}
|
|
|
|
static size_t findNull(ArrayRef<uint8_t> A, size_t EntSize) {
|
|
// Optimize the common case.
|
|
StringRef S((const char *)A.data(), A.size());
|
|
if (EntSize == 1)
|
|
return S.find(0);
|
|
|
|
for (unsigned I = 0, N = S.size(); I != N; I += EntSize) {
|
|
const char *B = S.begin() + I;
|
|
if (std::all_of(B, B + EntSize, [](char C) { return C == 0; }))
|
|
return I;
|
|
}
|
|
return StringRef::npos;
|
|
}
|
|
|
|
SyntheticSection *MergeInputSection::getParent() const {
|
|
return cast_or_null<SyntheticSection>(Parent);
|
|
}
|
|
|
|
// Split SHF_STRINGS section. Such section is a sequence of
|
|
// null-terminated strings.
|
|
void MergeInputSection::splitStrings(ArrayRef<uint8_t> Data, size_t EntSize) {
|
|
size_t Off = 0;
|
|
bool IsAlloc = this->Flags & SHF_ALLOC;
|
|
while (!Data.empty()) {
|
|
size_t End = findNull(Data, EntSize);
|
|
if (End == StringRef::npos)
|
|
fatal(toString(this) + ": string is not null terminated");
|
|
size_t Size = End + EntSize;
|
|
Pieces.emplace_back(Off, !IsAlloc);
|
|
Hashes.push_back(hash_value(toStringRef(Data.slice(0, Size))));
|
|
Data = Data.slice(Size);
|
|
Off += Size;
|
|
}
|
|
}
|
|
|
|
// Split non-SHF_STRINGS section. Such section is a sequence of
|
|
// fixed size records.
|
|
void MergeInputSection::splitNonStrings(ArrayRef<uint8_t> Data,
|
|
size_t EntSize) {
|
|
size_t Size = Data.size();
|
|
assert((Size % EntSize) == 0);
|
|
bool IsAlloc = this->Flags & SHF_ALLOC;
|
|
for (unsigned I = 0, N = Size; I != N; I += EntSize) {
|
|
Hashes.push_back(hash_value(toStringRef(Data.slice(I, EntSize))));
|
|
Pieces.emplace_back(I, !IsAlloc);
|
|
}
|
|
}
|
|
|
|
template <class ELFT>
|
|
MergeInputSection::MergeInputSection(ObjFile<ELFT> *F,
|
|
const typename ELFT::Shdr *Header,
|
|
StringRef Name)
|
|
: InputSectionBase(F, Header, Name, InputSectionBase::Merge) {}
|
|
|
|
// This function is called after we obtain a complete list of input sections
|
|
// that need to be linked. This is responsible to split section contents
|
|
// into small chunks for further processing.
|
|
//
|
|
// Note that this function is called from parallelForEach. This must be
|
|
// thread-safe (i.e. no memory allocation from the pools).
|
|
void MergeInputSection::splitIntoPieces() {
|
|
assert(Pieces.empty());
|
|
ArrayRef<uint8_t> Data = this->Data;
|
|
uint64_t EntSize = this->Entsize;
|
|
if (this->Flags & SHF_STRINGS)
|
|
splitStrings(Data, EntSize);
|
|
else
|
|
splitNonStrings(Data, EntSize);
|
|
|
|
if (Config->GcSections && (this->Flags & SHF_ALLOC))
|
|
for (uint64_t Off : LiveOffsets)
|
|
this->getSectionPiece(Off)->Live = true;
|
|
}
|
|
|
|
bool MergeInputSection::classof(const SectionBase *S) {
|
|
return S->kind() == InputSectionBase::Merge;
|
|
}
|
|
|
|
// Do binary search to get a section piece at a given input offset.
|
|
SectionPiece *MergeInputSection::getSectionPiece(uint64_t Offset) {
|
|
auto *This = static_cast<const MergeInputSection *>(this);
|
|
return const_cast<SectionPiece *>(This->getSectionPiece(Offset));
|
|
}
|
|
|
|
template <class It, class T, class Compare>
|
|
static It fastUpperBound(It First, It Last, const T &Value, Compare Comp) {
|
|
size_t Size = std::distance(First, Last);
|
|
assert(Size != 0);
|
|
while (Size != 1) {
|
|
size_t H = Size / 2;
|
|
const It MI = First + H;
|
|
Size -= H;
|
|
First = Comp(Value, *MI) ? First : First + H;
|
|
}
|
|
return Comp(Value, *First) ? First : First + 1;
|
|
}
|
|
|
|
const SectionPiece *MergeInputSection::getSectionPiece(uint64_t Offset) const {
|
|
uint64_t Size = this->Data.size();
|
|
if (Offset >= Size)
|
|
fatal(toString(this) + ": entry is past the end of the section");
|
|
|
|
// Find the element this offset points to.
|
|
auto I = fastUpperBound(
|
|
Pieces.begin(), Pieces.end(), Offset,
|
|
[](const uint64_t &A, const SectionPiece &B) { return A < B.InputOff; });
|
|
--I;
|
|
return &*I;
|
|
}
|
|
|
|
// Returns the offset in an output section for a given input offset.
|
|
// Because contents of a mergeable section is not contiguous in output,
|
|
// it is not just an addition to a base output offset.
|
|
uint64_t MergeInputSection::getOffset(uint64_t Offset) const {
|
|
// Initialize OffsetMap lazily.
|
|
llvm::call_once(InitOffsetMap, [&] {
|
|
OffsetMap.reserve(Pieces.size());
|
|
for (const SectionPiece &Piece : Pieces)
|
|
OffsetMap[Piece.InputOff] = Piece.OutputOff;
|
|
});
|
|
|
|
// Find a string starting at a given offset.
|
|
auto It = OffsetMap.find(Offset);
|
|
if (It != OffsetMap.end())
|
|
return It->second;
|
|
|
|
if (!this->Live)
|
|
return 0;
|
|
|
|
// If Offset is not at beginning of a section piece, it is not in the map.
|
|
// In that case we need to search from the original section piece vector.
|
|
const SectionPiece &Piece = *this->getSectionPiece(Offset);
|
|
if (!Piece.Live)
|
|
return 0;
|
|
|
|
uint64_t Addend = Offset - Piece.InputOff;
|
|
return Piece.OutputOff + Addend;
|
|
}
|
|
|
|
template InputSection::InputSection(ObjFile<ELF32LE> *, const ELF32LE::Shdr *,
|
|
StringRef);
|
|
template InputSection::InputSection(ObjFile<ELF32BE> *, const ELF32BE::Shdr *,
|
|
StringRef);
|
|
template InputSection::InputSection(ObjFile<ELF64LE> *, const ELF64LE::Shdr *,
|
|
StringRef);
|
|
template InputSection::InputSection(ObjFile<ELF64BE> *, const ELF64BE::Shdr *,
|
|
StringRef);
|
|
|
|
template std::string InputSectionBase::getLocation<ELF32LE>(uint64_t);
|
|
template std::string InputSectionBase::getLocation<ELF32BE>(uint64_t);
|
|
template std::string InputSectionBase::getLocation<ELF64LE>(uint64_t);
|
|
template std::string InputSectionBase::getLocation<ELF64BE>(uint64_t);
|
|
|
|
template std::string InputSectionBase::getSrcMsg<ELF32LE>(uint64_t);
|
|
template std::string InputSectionBase::getSrcMsg<ELF32BE>(uint64_t);
|
|
template std::string InputSectionBase::getSrcMsg<ELF64LE>(uint64_t);
|
|
template std::string InputSectionBase::getSrcMsg<ELF64BE>(uint64_t);
|
|
|
|
template std::string InputSectionBase::getObjMsg<ELF32LE>(uint64_t);
|
|
template std::string InputSectionBase::getObjMsg<ELF32BE>(uint64_t);
|
|
template std::string InputSectionBase::getObjMsg<ELF64LE>(uint64_t);
|
|
template std::string InputSectionBase::getObjMsg<ELF64BE>(uint64_t);
|
|
|
|
template void InputSection::writeTo<ELF32LE>(uint8_t *);
|
|
template void InputSection::writeTo<ELF32BE>(uint8_t *);
|
|
template void InputSection::writeTo<ELF64LE>(uint8_t *);
|
|
template void InputSection::writeTo<ELF64BE>(uint8_t *);
|
|
|
|
template ObjFile<ELF32LE> *InputSectionBase::getFile<ELF32LE>() const;
|
|
template ObjFile<ELF32BE> *InputSectionBase::getFile<ELF32BE>() const;
|
|
template ObjFile<ELF64LE> *InputSectionBase::getFile<ELF64LE>() const;
|
|
template ObjFile<ELF64BE> *InputSectionBase::getFile<ELF64BE>() const;
|
|
|
|
template MergeInputSection::MergeInputSection(ObjFile<ELF32LE> *,
|
|
const ELF32LE::Shdr *, StringRef);
|
|
template MergeInputSection::MergeInputSection(ObjFile<ELF32BE> *,
|
|
const ELF32BE::Shdr *, StringRef);
|
|
template MergeInputSection::MergeInputSection(ObjFile<ELF64LE> *,
|
|
const ELF64LE::Shdr *, StringRef);
|
|
template MergeInputSection::MergeInputSection(ObjFile<ELF64BE> *,
|
|
const ELF64BE::Shdr *, StringRef);
|
|
|
|
template EhInputSection::EhInputSection(ObjFile<ELF32LE> *,
|
|
const ELF32LE::Shdr *, StringRef);
|
|
template EhInputSection::EhInputSection(ObjFile<ELF32BE> *,
|
|
const ELF32BE::Shdr *, StringRef);
|
|
template EhInputSection::EhInputSection(ObjFile<ELF64LE> *,
|
|
const ELF64LE::Shdr *, StringRef);
|
|
template EhInputSection::EhInputSection(ObjFile<ELF64BE> *,
|
|
const ELF64BE::Shdr *, StringRef);
|
|
|
|
template void EhInputSection::split<ELF32LE>();
|
|
template void EhInputSection::split<ELF32BE>();
|
|
template void EhInputSection::split<ELF64LE>();
|
|
template void EhInputSection::split<ELF64BE>();
|