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https://github.com/RPCS3/llvm-mirror.git
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0668ae6ade
This reverts commit c989993ba1a666f04f7aee7df51d9f4de0588b71. maskray already fixed the explicit instantiation definition in the .cpp file, and these extern template declarations seem to be causing warnings that I don't understand.
778 lines
26 KiB
C++
778 lines
26 KiB
C++
//===--- XCOFFObjectFile.cpp - XCOFF object file implementation -----------===//
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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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//
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// This file defines the XCOFFObjectFile class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Object/XCOFFObjectFile.h"
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#include <cstddef>
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#include <cstring>
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namespace llvm {
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namespace object {
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enum { FUNCTION_SYM = 0x20, SYM_TYPE_MASK = 0x07, RELOC_OVERFLOW = 65535 };
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// Checks that [Ptr, Ptr + Size) bytes fall inside the memory buffer
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// 'M'. Returns a pointer to the underlying object on success.
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template <typename T>
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static Expected<const T *> getObject(MemoryBufferRef M, const void *Ptr,
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const uint64_t Size = sizeof(T)) {
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uintptr_t Addr = uintptr_t(Ptr);
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if (std::error_code EC = Binary::checkOffset(M, Addr, Size))
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return errorCodeToError(EC);
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return reinterpret_cast<const T *>(Addr);
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}
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static uintptr_t getWithOffset(uintptr_t Base, ptrdiff_t Offset) {
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return reinterpret_cast<uintptr_t>(reinterpret_cast<const char *>(Base) +
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Offset);
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}
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template <typename T> static const T *viewAs(uintptr_t in) {
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return reinterpret_cast<const T *>(in);
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}
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static StringRef generateXCOFFFixedNameStringRef(const char *Name) {
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auto NulCharPtr =
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static_cast<const char *>(memchr(Name, '\0', XCOFF::NameSize));
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return NulCharPtr ? StringRef(Name, NulCharPtr - Name)
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: StringRef(Name, XCOFF::NameSize);
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}
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template <typename T> StringRef XCOFFSectionHeader<T>::getName() const {
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const T &DerivedXCOFFSectionHeader = static_cast<const T &>(*this);
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return generateXCOFFFixedNameStringRef(DerivedXCOFFSectionHeader.Name);
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}
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template <typename T> uint16_t XCOFFSectionHeader<T>::getSectionType() const {
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const T &DerivedXCOFFSectionHeader = static_cast<const T &>(*this);
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return DerivedXCOFFSectionHeader.Flags & SectionFlagsTypeMask;
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}
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template <typename T>
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bool XCOFFSectionHeader<T>::isReservedSectionType() const {
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return getSectionType() & SectionFlagsReservedMask;
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}
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bool XCOFFRelocation32::isRelocationSigned() const {
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return Info & XR_SIGN_INDICATOR_MASK;
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}
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bool XCOFFRelocation32::isFixupIndicated() const {
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return Info & XR_FIXUP_INDICATOR_MASK;
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}
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uint8_t XCOFFRelocation32::getRelocatedLength() const {
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// The relocation encodes the bit length being relocated minus 1. Add back
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// the 1 to get the actual length being relocated.
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return (Info & XR_BIASED_LENGTH_MASK) + 1;
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}
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void XCOFFObjectFile::checkSectionAddress(uintptr_t Addr,
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uintptr_t TableAddress) const {
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if (Addr < TableAddress)
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report_fatal_error("Section header outside of section header table.");
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uintptr_t Offset = Addr - TableAddress;
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if (Offset >= getSectionHeaderSize() * getNumberOfSections())
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report_fatal_error("Section header outside of section header table.");
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if (Offset % getSectionHeaderSize() != 0)
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report_fatal_error(
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"Section header pointer does not point to a valid section header.");
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}
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const XCOFFSectionHeader32 *
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XCOFFObjectFile::toSection32(DataRefImpl Ref) const {
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assert(!is64Bit() && "32-bit interface called on 64-bit object file.");
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#ifndef NDEBUG
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checkSectionAddress(Ref.p, getSectionHeaderTableAddress());
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#endif
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return viewAs<XCOFFSectionHeader32>(Ref.p);
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}
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const XCOFFSectionHeader64 *
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XCOFFObjectFile::toSection64(DataRefImpl Ref) const {
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assert(is64Bit() && "64-bit interface called on a 32-bit object file.");
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#ifndef NDEBUG
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checkSectionAddress(Ref.p, getSectionHeaderTableAddress());
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#endif
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return viewAs<XCOFFSectionHeader64>(Ref.p);
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}
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const XCOFFSymbolEntry *XCOFFObjectFile::toSymbolEntry(DataRefImpl Ref) const {
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assert(!is64Bit() && "Symbol table support not implemented for 64-bit.");
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assert(Ref.p != 0 && "Symbol table pointer can not be nullptr!");
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#ifndef NDEBUG
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checkSymbolEntryPointer(Ref.p);
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#endif
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auto SymEntPtr = viewAs<XCOFFSymbolEntry>(Ref.p);
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return SymEntPtr;
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}
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const XCOFFFileHeader32 *XCOFFObjectFile::fileHeader32() const {
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assert(!is64Bit() && "32-bit interface called on 64-bit object file.");
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return static_cast<const XCOFFFileHeader32 *>(FileHeader);
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}
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const XCOFFFileHeader64 *XCOFFObjectFile::fileHeader64() const {
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assert(is64Bit() && "64-bit interface called on a 32-bit object file.");
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return static_cast<const XCOFFFileHeader64 *>(FileHeader);
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}
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const XCOFFSectionHeader32 *
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XCOFFObjectFile::sectionHeaderTable32() const {
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assert(!is64Bit() && "32-bit interface called on 64-bit object file.");
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return static_cast<const XCOFFSectionHeader32 *>(SectionHeaderTable);
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}
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const XCOFFSectionHeader64 *
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XCOFFObjectFile::sectionHeaderTable64() const {
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assert(is64Bit() && "64-bit interface called on a 32-bit object file.");
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return static_cast<const XCOFFSectionHeader64 *>(SectionHeaderTable);
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}
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void XCOFFObjectFile::moveSymbolNext(DataRefImpl &Symb) const {
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const XCOFFSymbolEntry *SymEntPtr = toSymbolEntry(Symb);
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SymEntPtr += SymEntPtr->NumberOfAuxEntries + 1;
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#ifndef NDEBUG
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// This function is used by basic_symbol_iterator, which allows to
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// point to the end-of-symbol-table address.
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if (reinterpret_cast<uintptr_t>(SymEntPtr) != getEndOfSymbolTableAddress())
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checkSymbolEntryPointer(reinterpret_cast<uintptr_t>(SymEntPtr));
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#endif
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Symb.p = reinterpret_cast<uintptr_t>(SymEntPtr);
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}
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Expected<StringRef>
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XCOFFObjectFile::getStringTableEntry(uint32_t Offset) const {
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// The byte offset is relative to the start of the string table.
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// A byte offset value of 0 is a null or zero-length symbol
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// name. A byte offset in the range 1 to 3 (inclusive) points into the length
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// field; as a soft-error recovery mechanism, we treat such cases as having an
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// offset of 0.
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if (Offset < 4)
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return StringRef(nullptr, 0);
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if (StringTable.Data != nullptr && StringTable.Size > Offset)
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return (StringTable.Data + Offset);
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return make_error<GenericBinaryError>("Bad offset for string table entry",
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object_error::parse_failed);
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}
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Expected<StringRef>
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XCOFFObjectFile::getCFileName(const XCOFFFileAuxEnt *CFileEntPtr) const {
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if (CFileEntPtr->NameInStrTbl.Magic !=
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XCOFFSymbolEntry::NAME_IN_STR_TBL_MAGIC)
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return generateXCOFFFixedNameStringRef(CFileEntPtr->Name);
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return getStringTableEntry(CFileEntPtr->NameInStrTbl.Offset);
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}
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Expected<StringRef> XCOFFObjectFile::getSymbolName(DataRefImpl Symb) const {
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const XCOFFSymbolEntry *SymEntPtr = toSymbolEntry(Symb);
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// A storage class value with the high-order bit on indicates that the name is
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// a symbolic debugger stabstring.
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if (SymEntPtr->StorageClass & 0x80)
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return StringRef("Unimplemented Debug Name");
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if (SymEntPtr->NameInStrTbl.Magic != XCOFFSymbolEntry::NAME_IN_STR_TBL_MAGIC)
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return generateXCOFFFixedNameStringRef(SymEntPtr->SymbolName);
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return getStringTableEntry(SymEntPtr->NameInStrTbl.Offset);
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}
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Expected<uint64_t> XCOFFObjectFile::getSymbolAddress(DataRefImpl Symb) const {
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uint64_t Result = 0;
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llvm_unreachable("Not yet implemented!");
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return Result;
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}
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uint64_t XCOFFObjectFile::getSymbolValueImpl(DataRefImpl Symb) const {
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assert(!is64Bit() && "Symbol table support not implemented for 64-bit.");
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return toSymbolEntry(Symb)->Value;
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}
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uint64_t XCOFFObjectFile::getCommonSymbolSizeImpl(DataRefImpl Symb) const {
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uint64_t Result = 0;
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llvm_unreachable("Not yet implemented!");
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return Result;
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}
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Expected<SymbolRef::Type>
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XCOFFObjectFile::getSymbolType(DataRefImpl Symb) const {
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llvm_unreachable("Not yet implemented!");
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return SymbolRef::ST_Other;
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}
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Expected<section_iterator>
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XCOFFObjectFile::getSymbolSection(DataRefImpl Symb) const {
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const XCOFFSymbolEntry *SymEntPtr = toSymbolEntry(Symb);
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int16_t SectNum = SymEntPtr->SectionNumber;
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if (isReservedSectionNumber(SectNum))
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return section_end();
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Expected<DataRefImpl> ExpSec = getSectionByNum(SectNum);
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if (!ExpSec)
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return ExpSec.takeError();
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return section_iterator(SectionRef(ExpSec.get(), this));
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}
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void XCOFFObjectFile::moveSectionNext(DataRefImpl &Sec) const {
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const char *Ptr = reinterpret_cast<const char *>(Sec.p);
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Sec.p = reinterpret_cast<uintptr_t>(Ptr + getSectionHeaderSize());
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}
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Expected<StringRef> XCOFFObjectFile::getSectionName(DataRefImpl Sec) const {
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return generateXCOFFFixedNameStringRef(getSectionNameInternal(Sec));
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}
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uint64_t XCOFFObjectFile::getSectionAddress(DataRefImpl Sec) const {
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// Avoid ternary due to failure to convert the ubig32_t value to a unit64_t
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// with MSVC.
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if (is64Bit())
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return toSection64(Sec)->VirtualAddress;
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return toSection32(Sec)->VirtualAddress;
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}
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uint64_t XCOFFObjectFile::getSectionIndex(DataRefImpl Sec) const {
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// Section numbers in XCOFF are numbered beginning at 1. A section number of
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// zero is used to indicate that a symbol is being imported or is undefined.
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if (is64Bit())
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return toSection64(Sec) - sectionHeaderTable64() + 1;
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else
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return toSection32(Sec) - sectionHeaderTable32() + 1;
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}
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uint64_t XCOFFObjectFile::getSectionSize(DataRefImpl Sec) const {
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// Avoid ternary due to failure to convert the ubig32_t value to a unit64_t
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// with MSVC.
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if (is64Bit())
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return toSection64(Sec)->SectionSize;
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return toSection32(Sec)->SectionSize;
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}
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Expected<ArrayRef<uint8_t>>
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XCOFFObjectFile::getSectionContents(DataRefImpl Sec) const {
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llvm_unreachable("Not yet implemented!");
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}
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uint64_t XCOFFObjectFile::getSectionAlignment(DataRefImpl Sec) const {
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uint64_t Result = 0;
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llvm_unreachable("Not yet implemented!");
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return Result;
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}
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bool XCOFFObjectFile::isSectionCompressed(DataRefImpl Sec) const {
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bool Result = false;
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llvm_unreachable("Not yet implemented!");
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return Result;
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}
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bool XCOFFObjectFile::isSectionText(DataRefImpl Sec) const {
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return getSectionFlags(Sec) & XCOFF::STYP_TEXT;
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}
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bool XCOFFObjectFile::isSectionData(DataRefImpl Sec) const {
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uint32_t Flags = getSectionFlags(Sec);
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return Flags & (XCOFF::STYP_DATA | XCOFF::STYP_TDATA);
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}
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bool XCOFFObjectFile::isSectionBSS(DataRefImpl Sec) const {
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uint32_t Flags = getSectionFlags(Sec);
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return Flags & (XCOFF::STYP_BSS | XCOFF::STYP_TBSS);
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}
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bool XCOFFObjectFile::isSectionVirtual(DataRefImpl Sec) const {
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bool Result = false;
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llvm_unreachable("Not yet implemented!");
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return Result;
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}
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relocation_iterator XCOFFObjectFile::section_rel_begin(DataRefImpl Sec) const {
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llvm_unreachable("Not yet implemented!");
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return relocation_iterator(RelocationRef());
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}
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relocation_iterator XCOFFObjectFile::section_rel_end(DataRefImpl Sec) const {
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llvm_unreachable("Not yet implemented!");
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return relocation_iterator(RelocationRef());
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}
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void XCOFFObjectFile::moveRelocationNext(DataRefImpl &Rel) const {
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llvm_unreachable("Not yet implemented!");
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return;
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}
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uint64_t XCOFFObjectFile::getRelocationOffset(DataRefImpl Rel) const {
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llvm_unreachable("Not yet implemented!");
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uint64_t Result = 0;
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return Result;
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}
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symbol_iterator XCOFFObjectFile::getRelocationSymbol(DataRefImpl Rel) const {
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llvm_unreachable("Not yet implemented!");
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return symbol_iterator(SymbolRef());
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}
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uint64_t XCOFFObjectFile::getRelocationType(DataRefImpl Rel) const {
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llvm_unreachable("Not yet implemented!");
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uint64_t Result = 0;
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return Result;
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}
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void XCOFFObjectFile::getRelocationTypeName(
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DataRefImpl Rel, SmallVectorImpl<char> &Result) const {
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llvm_unreachable("Not yet implemented!");
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return;
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}
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uint32_t XCOFFObjectFile::getSymbolFlags(DataRefImpl Symb) const {
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uint32_t Result = 0;
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llvm_unreachable("Not yet implemented!");
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return Result;
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}
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basic_symbol_iterator XCOFFObjectFile::symbol_begin() const {
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assert(!is64Bit() && "64-bit support not implemented yet.");
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DataRefImpl SymDRI;
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SymDRI.p = reinterpret_cast<uintptr_t>(SymbolTblPtr);
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return basic_symbol_iterator(SymbolRef(SymDRI, this));
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}
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basic_symbol_iterator XCOFFObjectFile::symbol_end() const {
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assert(!is64Bit() && "64-bit support not implemented yet.");
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DataRefImpl SymDRI;
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SymDRI.p = reinterpret_cast<uintptr_t>(
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SymbolTblPtr + getLogicalNumberOfSymbolTableEntries32());
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return basic_symbol_iterator(SymbolRef(SymDRI, this));
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}
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section_iterator XCOFFObjectFile::section_begin() const {
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DataRefImpl DRI;
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DRI.p = getSectionHeaderTableAddress();
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return section_iterator(SectionRef(DRI, this));
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}
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section_iterator XCOFFObjectFile::section_end() const {
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DataRefImpl DRI;
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DRI.p = getWithOffset(getSectionHeaderTableAddress(),
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getNumberOfSections() * getSectionHeaderSize());
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return section_iterator(SectionRef(DRI, this));
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}
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uint8_t XCOFFObjectFile::getBytesInAddress() const { return is64Bit() ? 8 : 4; }
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StringRef XCOFFObjectFile::getFileFormatName() const {
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return is64Bit() ? "aix5coff64-rs6000" : "aixcoff-rs6000";
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}
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Triple::ArchType XCOFFObjectFile::getArch() const {
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return is64Bit() ? Triple::ppc64 : Triple::ppc;
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}
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SubtargetFeatures XCOFFObjectFile::getFeatures() const {
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llvm_unreachable("Not yet implemented!");
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return SubtargetFeatures();
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}
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bool XCOFFObjectFile::isRelocatableObject() const {
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bool Result = false;
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llvm_unreachable("Not yet implemented!");
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return Result;
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}
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Expected<uint64_t> XCOFFObjectFile::getStartAddress() const {
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// TODO FIXME Should get from auxiliary_header->o_entry when support for the
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// auxiliary_header is added.
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return 0;
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}
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size_t XCOFFObjectFile::getFileHeaderSize() const {
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return is64Bit() ? sizeof(XCOFFFileHeader64) : sizeof(XCOFFFileHeader32);
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}
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size_t XCOFFObjectFile::getSectionHeaderSize() const {
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return is64Bit() ? sizeof(XCOFFSectionHeader64) :
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sizeof(XCOFFSectionHeader32);
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}
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bool XCOFFObjectFile::is64Bit() const {
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return Binary::ID_XCOFF64 == getType();
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}
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uint16_t XCOFFObjectFile::getMagic() const {
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return is64Bit() ? fileHeader64()->Magic : fileHeader32()->Magic;
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}
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Expected<DataRefImpl> XCOFFObjectFile::getSectionByNum(int16_t Num) const {
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if (Num <= 0 || Num > getNumberOfSections())
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return errorCodeToError(object_error::invalid_section_index);
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DataRefImpl DRI;
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DRI.p = getWithOffset(getSectionHeaderTableAddress(),
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getSectionHeaderSize() * (Num - 1));
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return DRI;
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}
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Expected<StringRef>
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XCOFFObjectFile::getSymbolSectionName(const XCOFFSymbolEntry *SymEntPtr) const {
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assert(!is64Bit() && "Symbol table support not implemented for 64-bit.");
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int16_t SectionNum = SymEntPtr->SectionNumber;
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switch (SectionNum) {
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case XCOFF::N_DEBUG:
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return "N_DEBUG";
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case XCOFF::N_ABS:
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return "N_ABS";
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case XCOFF::N_UNDEF:
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return "N_UNDEF";
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default:
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Expected<DataRefImpl> SecRef = getSectionByNum(SectionNum);
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if (SecRef)
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return generateXCOFFFixedNameStringRef(
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getSectionNameInternal(SecRef.get()));
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return SecRef.takeError();
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}
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}
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bool XCOFFObjectFile::isReservedSectionNumber(int16_t SectionNumber) {
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return (SectionNumber <= 0 && SectionNumber >= -2);
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}
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uint16_t XCOFFObjectFile::getNumberOfSections() const {
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return is64Bit() ? fileHeader64()->NumberOfSections
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: fileHeader32()->NumberOfSections;
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}
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int32_t XCOFFObjectFile::getTimeStamp() const {
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return is64Bit() ? fileHeader64()->TimeStamp : fileHeader32()->TimeStamp;
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}
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uint16_t XCOFFObjectFile::getOptionalHeaderSize() const {
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return is64Bit() ? fileHeader64()->AuxHeaderSize
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: fileHeader32()->AuxHeaderSize;
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}
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uint32_t XCOFFObjectFile::getSymbolTableOffset32() const {
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return fileHeader32()->SymbolTableOffset;
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}
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int32_t XCOFFObjectFile::getRawNumberOfSymbolTableEntries32() const {
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// As far as symbol table size is concerned, if this field is negative it is
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// to be treated as a 0. However since this field is also used for printing we
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// don't want to truncate any negative values.
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return fileHeader32()->NumberOfSymTableEntries;
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}
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uint32_t XCOFFObjectFile::getLogicalNumberOfSymbolTableEntries32() const {
|
|
return (fileHeader32()->NumberOfSymTableEntries >= 0
|
|
? fileHeader32()->NumberOfSymTableEntries
|
|
: 0);
|
|
}
|
|
|
|
uint64_t XCOFFObjectFile::getSymbolTableOffset64() const {
|
|
return fileHeader64()->SymbolTableOffset;
|
|
}
|
|
|
|
uint32_t XCOFFObjectFile::getNumberOfSymbolTableEntries64() const {
|
|
return fileHeader64()->NumberOfSymTableEntries;
|
|
}
|
|
|
|
uintptr_t XCOFFObjectFile::getEndOfSymbolTableAddress() const {
|
|
uint32_t NumberOfSymTableEntries =
|
|
is64Bit() ? getNumberOfSymbolTableEntries64()
|
|
: getLogicalNumberOfSymbolTableEntries32();
|
|
return getWithOffset(reinterpret_cast<uintptr_t>(SymbolTblPtr),
|
|
XCOFF::SymbolTableEntrySize * NumberOfSymTableEntries);
|
|
}
|
|
|
|
void XCOFFObjectFile::checkSymbolEntryPointer(uintptr_t SymbolEntPtr) const {
|
|
if (SymbolEntPtr < reinterpret_cast<uintptr_t>(SymbolTblPtr))
|
|
report_fatal_error("Symbol table entry is outside of symbol table.");
|
|
|
|
if (SymbolEntPtr >= getEndOfSymbolTableAddress())
|
|
report_fatal_error("Symbol table entry is outside of symbol table.");
|
|
|
|
ptrdiff_t Offset = reinterpret_cast<const char *>(SymbolEntPtr) -
|
|
reinterpret_cast<const char *>(SymbolTblPtr);
|
|
|
|
if (Offset % XCOFF::SymbolTableEntrySize != 0)
|
|
report_fatal_error(
|
|
"Symbol table entry position is not valid inside of symbol table.");
|
|
}
|
|
|
|
uint32_t XCOFFObjectFile::getSymbolIndex(uintptr_t SymbolEntPtr) const {
|
|
return (reinterpret_cast<const char *>(SymbolEntPtr) -
|
|
reinterpret_cast<const char *>(SymbolTblPtr)) /
|
|
XCOFF::SymbolTableEntrySize;
|
|
}
|
|
|
|
Expected<StringRef>
|
|
XCOFFObjectFile::getSymbolNameByIndex(uint32_t Index) const {
|
|
if (is64Bit())
|
|
report_fatal_error("64-bit symbol table support not implemented yet.");
|
|
|
|
if (Index >= getLogicalNumberOfSymbolTableEntries32())
|
|
return errorCodeToError(object_error::invalid_symbol_index);
|
|
|
|
DataRefImpl SymDRI;
|
|
SymDRI.p = reinterpret_cast<uintptr_t>(getPointerToSymbolTable() + Index);
|
|
return getSymbolName(SymDRI);
|
|
}
|
|
|
|
uint16_t XCOFFObjectFile::getFlags() const {
|
|
return is64Bit() ? fileHeader64()->Flags : fileHeader32()->Flags;
|
|
}
|
|
|
|
const char *XCOFFObjectFile::getSectionNameInternal(DataRefImpl Sec) const {
|
|
return is64Bit() ? toSection64(Sec)->Name : toSection32(Sec)->Name;
|
|
}
|
|
|
|
uintptr_t XCOFFObjectFile::getSectionHeaderTableAddress() const {
|
|
return reinterpret_cast<uintptr_t>(SectionHeaderTable);
|
|
}
|
|
|
|
int32_t XCOFFObjectFile::getSectionFlags(DataRefImpl Sec) const {
|
|
return is64Bit() ? toSection64(Sec)->Flags : toSection32(Sec)->Flags;
|
|
}
|
|
|
|
XCOFFObjectFile::XCOFFObjectFile(unsigned int Type, MemoryBufferRef Object)
|
|
: ObjectFile(Type, Object) {
|
|
assert(Type == Binary::ID_XCOFF32 || Type == Binary::ID_XCOFF64);
|
|
}
|
|
|
|
ArrayRef<XCOFFSectionHeader64> XCOFFObjectFile::sections64() const {
|
|
assert(is64Bit() && "64-bit interface called for non 64-bit file.");
|
|
const XCOFFSectionHeader64 *TablePtr = sectionHeaderTable64();
|
|
return ArrayRef<XCOFFSectionHeader64>(TablePtr,
|
|
TablePtr + getNumberOfSections());
|
|
}
|
|
|
|
ArrayRef<XCOFFSectionHeader32> XCOFFObjectFile::sections32() const {
|
|
assert(!is64Bit() && "32-bit interface called for non 32-bit file.");
|
|
const XCOFFSectionHeader32 *TablePtr = sectionHeaderTable32();
|
|
return ArrayRef<XCOFFSectionHeader32>(TablePtr,
|
|
TablePtr + getNumberOfSections());
|
|
}
|
|
|
|
// In an XCOFF32 file, when the field value is 65535, then an STYP_OVRFLO
|
|
// section header contains the actual count of relocation entries in the s_paddr
|
|
// field. STYP_OVRFLO headers contain the section index of their corresponding
|
|
// sections as their raw "NumberOfRelocations" field value.
|
|
Expected<uint32_t> XCOFFObjectFile::getLogicalNumberOfRelocationEntries(
|
|
const XCOFFSectionHeader32 &Sec) const {
|
|
|
|
uint16_t SectionIndex = &Sec - sectionHeaderTable32() + 1;
|
|
|
|
if (Sec.NumberOfRelocations < RELOC_OVERFLOW)
|
|
return Sec.NumberOfRelocations;
|
|
for (const auto &Sec : sections32()) {
|
|
if (Sec.Flags == XCOFF::STYP_OVRFLO &&
|
|
Sec.NumberOfRelocations == SectionIndex)
|
|
return Sec.PhysicalAddress;
|
|
}
|
|
return errorCodeToError(object_error::parse_failed);
|
|
}
|
|
|
|
Expected<ArrayRef<XCOFFRelocation32>>
|
|
XCOFFObjectFile::relocations(const XCOFFSectionHeader32 &Sec) const {
|
|
uintptr_t RelocAddr = getWithOffset(reinterpret_cast<uintptr_t>(FileHeader),
|
|
Sec.FileOffsetToRelocationInfo);
|
|
auto NumRelocEntriesOrErr = getLogicalNumberOfRelocationEntries(Sec);
|
|
if (Error E = NumRelocEntriesOrErr.takeError())
|
|
return std::move(E);
|
|
|
|
uint32_t NumRelocEntries = NumRelocEntriesOrErr.get();
|
|
|
|
auto RelocationOrErr =
|
|
getObject<XCOFFRelocation32>(Data, reinterpret_cast<void *>(RelocAddr),
|
|
NumRelocEntries * sizeof(XCOFFRelocation32));
|
|
if (Error E = RelocationOrErr.takeError())
|
|
return std::move(E);
|
|
|
|
const XCOFFRelocation32 *StartReloc = RelocationOrErr.get();
|
|
|
|
return ArrayRef<XCOFFRelocation32>(StartReloc, StartReloc + NumRelocEntries);
|
|
}
|
|
|
|
Expected<XCOFFStringTable>
|
|
XCOFFObjectFile::parseStringTable(const XCOFFObjectFile *Obj, uint64_t Offset) {
|
|
// If there is a string table, then the buffer must contain at least 4 bytes
|
|
// for the string table's size. Not having a string table is not an error.
|
|
if (auto EC = Binary::checkOffset(
|
|
Obj->Data, reinterpret_cast<uintptr_t>(Obj->base() + Offset), 4))
|
|
return XCOFFStringTable{0, nullptr};
|
|
|
|
// Read the size out of the buffer.
|
|
uint32_t Size = support::endian::read32be(Obj->base() + Offset);
|
|
|
|
// If the size is less then 4, then the string table is just a size and no
|
|
// string data.
|
|
if (Size <= 4)
|
|
return XCOFFStringTable{4, nullptr};
|
|
|
|
auto StringTableOrErr =
|
|
getObject<char>(Obj->Data, Obj->base() + Offset, Size);
|
|
if (Error E = StringTableOrErr.takeError())
|
|
return std::move(E);
|
|
|
|
const char *StringTablePtr = StringTableOrErr.get();
|
|
if (StringTablePtr[Size - 1] != '\0')
|
|
return errorCodeToError(object_error::string_table_non_null_end);
|
|
|
|
return XCOFFStringTable{Size, StringTablePtr};
|
|
}
|
|
|
|
Expected<std::unique_ptr<XCOFFObjectFile>>
|
|
XCOFFObjectFile::create(unsigned Type, MemoryBufferRef MBR) {
|
|
// Can't use std::make_unique because of the private constructor.
|
|
std::unique_ptr<XCOFFObjectFile> Obj;
|
|
Obj.reset(new XCOFFObjectFile(Type, MBR));
|
|
|
|
uint64_t CurOffset = 0;
|
|
const auto *Base = Obj->base();
|
|
MemoryBufferRef Data = Obj->Data;
|
|
|
|
// Parse file header.
|
|
auto FileHeaderOrErr =
|
|
getObject<void>(Data, Base + CurOffset, Obj->getFileHeaderSize());
|
|
if (Error E = FileHeaderOrErr.takeError())
|
|
return std::move(E);
|
|
Obj->FileHeader = FileHeaderOrErr.get();
|
|
|
|
CurOffset += Obj->getFileHeaderSize();
|
|
// TODO FIXME we don't have support for an optional header yet, so just skip
|
|
// past it.
|
|
CurOffset += Obj->getOptionalHeaderSize();
|
|
|
|
// Parse the section header table if it is present.
|
|
if (Obj->getNumberOfSections()) {
|
|
auto SecHeadersOrErr = getObject<void>(Data, Base + CurOffset,
|
|
Obj->getNumberOfSections() *
|
|
Obj->getSectionHeaderSize());
|
|
if (Error E = SecHeadersOrErr.takeError())
|
|
return std::move(E);
|
|
Obj->SectionHeaderTable = SecHeadersOrErr.get();
|
|
}
|
|
|
|
// 64-bit object supports only file header and section headers for now.
|
|
if (Obj->is64Bit())
|
|
return std::move(Obj);
|
|
|
|
// If there is no symbol table we are done parsing the memory buffer.
|
|
if (Obj->getLogicalNumberOfSymbolTableEntries32() == 0)
|
|
return std::move(Obj);
|
|
|
|
// Parse symbol table.
|
|
CurOffset = Obj->fileHeader32()->SymbolTableOffset;
|
|
uint64_t SymbolTableSize = (uint64_t)(sizeof(XCOFFSymbolEntry)) *
|
|
Obj->getLogicalNumberOfSymbolTableEntries32();
|
|
auto SymTableOrErr =
|
|
getObject<XCOFFSymbolEntry>(Data, Base + CurOffset, SymbolTableSize);
|
|
if (Error E = SymTableOrErr.takeError())
|
|
return std::move(E);
|
|
Obj->SymbolTblPtr = SymTableOrErr.get();
|
|
CurOffset += SymbolTableSize;
|
|
|
|
// Parse String table.
|
|
Expected<XCOFFStringTable> StringTableOrErr =
|
|
parseStringTable(Obj.get(), CurOffset);
|
|
if (Error E = StringTableOrErr.takeError())
|
|
return std::move(E);
|
|
Obj->StringTable = StringTableOrErr.get();
|
|
|
|
return std::move(Obj);
|
|
}
|
|
|
|
Expected<std::unique_ptr<ObjectFile>>
|
|
ObjectFile::createXCOFFObjectFile(MemoryBufferRef MemBufRef,
|
|
unsigned FileType) {
|
|
return XCOFFObjectFile::create(FileType, MemBufRef);
|
|
}
|
|
|
|
XCOFF::StorageClass XCOFFSymbolRef::getStorageClass() const {
|
|
return OwningObjectPtr->toSymbolEntry(SymEntDataRef)->StorageClass;
|
|
}
|
|
|
|
uint8_t XCOFFSymbolRef::getNumberOfAuxEntries() const {
|
|
return OwningObjectPtr->toSymbolEntry(SymEntDataRef)->NumberOfAuxEntries;
|
|
}
|
|
|
|
const XCOFFCsectAuxEnt32 *XCOFFSymbolRef::getXCOFFCsectAuxEnt32() const {
|
|
assert(!OwningObjectPtr->is64Bit() &&
|
|
"32-bit interface called on 64-bit object file.");
|
|
assert(hasCsectAuxEnt() && "No Csect Auxiliary Entry is found.");
|
|
|
|
// In XCOFF32, the csect auxilliary entry is always the last auxiliary
|
|
// entry for the symbol.
|
|
uintptr_t AuxAddr = getWithOffset(
|
|
SymEntDataRef.p, XCOFF::SymbolTableEntrySize * getNumberOfAuxEntries());
|
|
|
|
#ifndef NDEBUG
|
|
OwningObjectPtr->checkSymbolEntryPointer(AuxAddr);
|
|
#endif
|
|
|
|
return reinterpret_cast<const XCOFFCsectAuxEnt32 *>(AuxAddr);
|
|
}
|
|
|
|
uint16_t XCOFFSymbolRef::getType() const {
|
|
return OwningObjectPtr->toSymbolEntry(SymEntDataRef)->SymbolType;
|
|
}
|
|
|
|
int16_t XCOFFSymbolRef::getSectionNumber() const {
|
|
return OwningObjectPtr->toSymbolEntry(SymEntDataRef)->SectionNumber;
|
|
}
|
|
|
|
bool XCOFFSymbolRef::hasCsectAuxEnt() const {
|
|
XCOFF::StorageClass SC = getStorageClass();
|
|
return (SC == XCOFF::C_EXT || SC == XCOFF::C_WEAKEXT ||
|
|
SC == XCOFF::C_HIDEXT);
|
|
}
|
|
|
|
bool XCOFFSymbolRef::isFunction() const {
|
|
if (OwningObjectPtr->is64Bit())
|
|
report_fatal_error("64-bit support is unimplemented yet.");
|
|
|
|
if (getType() & FUNCTION_SYM)
|
|
return true;
|
|
|
|
if (!hasCsectAuxEnt())
|
|
return false;
|
|
|
|
const XCOFFCsectAuxEnt32 *CsectAuxEnt = getXCOFFCsectAuxEnt32();
|
|
|
|
// A function definition should be a label definition.
|
|
if ((CsectAuxEnt->SymbolAlignmentAndType & SYM_TYPE_MASK) != XCOFF::XTY_LD)
|
|
return false;
|
|
|
|
if (CsectAuxEnt->StorageMappingClass != XCOFF::XMC_PR)
|
|
return false;
|
|
|
|
int16_t SectNum = getSectionNumber();
|
|
Expected<DataRefImpl> SI = OwningObjectPtr->getSectionByNum(SectNum);
|
|
if (!SI)
|
|
return false;
|
|
|
|
return (OwningObjectPtr->getSectionFlags(SI.get()) & XCOFF::STYP_TEXT);
|
|
}
|
|
|
|
// Explictly instantiate template classes.
|
|
template struct XCOFFSectionHeader<XCOFFSectionHeader32>;
|
|
template struct XCOFFSectionHeader<XCOFFSectionHeader64>;
|
|
|
|
} // namespace object
|
|
} // namespace llvm
|