61835d19a8
Summary: This is an initial implementation of lvm-objcopy for XCOFF32. Currently only supports simple copying, op-passthrough to follow. Reviewed By: jhenderson, shchenz Differential Revision: https://reviews.llvm.org/D97656
102 lines
3.4 KiB
C++
102 lines
3.4 KiB
C++
//===- XCOFFReader.cpp ----------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "XCOFFReader.h"
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namespace llvm {
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namespace objcopy {
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namespace xcoff {
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using namespace object;
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Error XCOFFReader::readSections(Object &Obj) const {
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ArrayRef<XCOFFSectionHeader32> Sections = XCOFFObj.sections32();
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for (const XCOFFSectionHeader32 &Sec : Sections) {
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Section ReadSec;
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// Section header.
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ReadSec.SectionHeader = Sec;
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DataRefImpl SectionDRI;
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SectionDRI.p = reinterpret_cast<uintptr_t>(&Sec);
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// Section data.
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if (Sec.SectionSize) {
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Expected<ArrayRef<uint8_t>> ContentsRef =
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XCOFFObj.getSectionContents(SectionDRI);
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if (!ContentsRef)
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return ContentsRef.takeError();
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ReadSec.Contents = ContentsRef.get();
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}
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// Relocations.
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if (Sec.NumberOfRelocations) {
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auto Relocations =
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XCOFFObj.relocations<XCOFFSectionHeader32, XCOFFRelocation32>(Sec);
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if (!Relocations)
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return Relocations.takeError();
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for (const XCOFFRelocation32 &Rel : Relocations.get())
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ReadSec.Relocations.push_back(Rel);
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}
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Obj.Sections.push_back(std::move(ReadSec));
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}
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return Error::success();
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}
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Error XCOFFReader::readSymbols(Object &Obj) const {
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std::vector<Symbol> Symbols;
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Symbols.reserve(XCOFFObj.getNumberOfSymbolTableEntries());
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for (SymbolRef Sym : XCOFFObj.symbols()) {
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Symbol ReadSym;
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DataRefImpl SymbolDRI = Sym.getRawDataRefImpl();
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XCOFFSymbolRef SymbolEntRef = XCOFFObj.toSymbolRef(SymbolDRI);
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ReadSym.Sym = *SymbolEntRef.getSymbol32();
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// Auxiliary entries.
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if (SymbolEntRef.getNumberOfAuxEntries()) {
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const char *Start = reinterpret_cast<const char *>(
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SymbolDRI.p + XCOFF::SymbolTableEntrySize);
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Expected<StringRef> RawAuxEntriesOrError = XCOFFObj.getRawData(
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Start,
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XCOFF::SymbolTableEntrySize * SymbolEntRef.getNumberOfAuxEntries(),
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StringRef("symbol"));
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if (!RawAuxEntriesOrError)
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return RawAuxEntriesOrError.takeError();
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ReadSym.AuxSymbolEntries = RawAuxEntriesOrError.get();
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}
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Obj.Symbols.push_back(std::move(ReadSym));
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}
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return Error::success();
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}
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Expected<std::unique_ptr<Object>> XCOFFReader::create() const {
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auto Obj = std::make_unique<Object>();
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// Only 32-bit supported now.
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if (XCOFFObj.is64Bit())
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return createStringError(object_error::invalid_file_type,
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"64-bit XCOFF is not supported yet");
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// Read the file header.
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Obj->FileHeader = *XCOFFObj.fileHeader32();
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// Read the optional header.
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if (XCOFFObj.getOptionalHeaderSize())
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Obj->OptionalFileHeader = *XCOFFObj.auxiliaryHeader32();
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// Read each section.
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Obj->Sections.reserve(XCOFFObj.getNumberOfSections());
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if (Error E = readSections(*Obj))
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return std::move(E);
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// Read each symbol.
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Obj->Symbols.reserve(XCOFFObj.getRawNumberOfSymbolTableEntries32());
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if (Error E = readSymbols(*Obj))
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return std::move(E);
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// String table.
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Obj->StringTable = XCOFFObj.getStringTable();
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return std::move(Obj);
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}
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} // end namespace xcoff
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} // end namespace objcopy
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} // end namespace llvm
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