499 lines
17 KiB
C
499 lines
17 KiB
C
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//===- XCOFFObjectFile.h - XCOFF object file implementation -----*- C++ -*-===//
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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 declares the XCOFFObjectFile class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_OBJECT_XCOFFOBJECTFILE_H
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#define LLVM_OBJECT_XCOFFOBJECTFILE_H
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/BinaryFormat/XCOFF.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Support/Endian.h"
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#include <limits>
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namespace llvm {
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namespace object {
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struct XCOFFFileHeader32 {
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support::ubig16_t Magic;
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support::ubig16_t NumberOfSections;
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// Unix time value, value of 0 indicates no timestamp.
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// Negative values are reserved.
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support::big32_t TimeStamp;
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support::ubig32_t SymbolTableOffset; // File offset to symbol table.
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support::big32_t NumberOfSymTableEntries;
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support::ubig16_t AuxHeaderSize;
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support::ubig16_t Flags;
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};
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struct XCOFFFileHeader64 {
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support::ubig16_t Magic;
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support::ubig16_t NumberOfSections;
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// Unix time value, value of 0 indicates no timestamp.
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// Negative values are reserved.
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support::big32_t TimeStamp;
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support::ubig64_t SymbolTableOffset; // File offset to symbol table.
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support::ubig16_t AuxHeaderSize;
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support::ubig16_t Flags;
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support::ubig32_t NumberOfSymTableEntries;
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};
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template <typename T> struct XCOFFSectionHeader {
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// Least significant 3 bits are reserved.
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static constexpr unsigned SectionFlagsReservedMask = 0x7;
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// The low order 16 bits of section flags denotes the section type.
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static constexpr unsigned SectionFlagsTypeMask = 0xffffu;
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public:
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StringRef getName() const;
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uint16_t getSectionType() const;
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bool isReservedSectionType() const;
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};
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// Explicit extern template declarations.
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struct XCOFFSectionHeader32;
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struct XCOFFSectionHeader64;
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extern template struct XCOFFSectionHeader<XCOFFSectionHeader32>;
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extern template struct XCOFFSectionHeader<XCOFFSectionHeader64>;
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struct XCOFFSectionHeader32 : XCOFFSectionHeader<XCOFFSectionHeader32> {
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char Name[XCOFF::NameSize];
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support::ubig32_t PhysicalAddress;
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support::ubig32_t VirtualAddress;
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support::ubig32_t SectionSize;
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support::ubig32_t FileOffsetToRawData;
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support::ubig32_t FileOffsetToRelocationInfo;
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support::ubig32_t FileOffsetToLineNumberInfo;
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support::ubig16_t NumberOfRelocations;
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support::ubig16_t NumberOfLineNumbers;
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support::big32_t Flags;
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};
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struct XCOFFSectionHeader64 : XCOFFSectionHeader<XCOFFSectionHeader64> {
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char Name[XCOFF::NameSize];
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support::ubig64_t PhysicalAddress;
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support::ubig64_t VirtualAddress;
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support::ubig64_t SectionSize;
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support::big64_t FileOffsetToRawData;
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support::big64_t FileOffsetToRelocationInfo;
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support::big64_t FileOffsetToLineNumberInfo;
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support::ubig32_t NumberOfRelocations;
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support::ubig32_t NumberOfLineNumbers;
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support::big32_t Flags;
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char Padding[4];
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};
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struct XCOFFSymbolEntry {
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enum { NAME_IN_STR_TBL_MAGIC = 0x0 };
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typedef struct {
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support::big32_t Magic; // Zero indicates name in string table.
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support::ubig32_t Offset;
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} NameInStrTblType;
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typedef struct {
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uint8_t LanguageId;
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uint8_t CpuTypeId;
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} CFileLanguageIdAndTypeIdType;
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union {
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char SymbolName[XCOFF::NameSize];
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NameInStrTblType NameInStrTbl;
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};
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support::ubig32_t Value; // Symbol value; storage class-dependent.
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support::big16_t SectionNumber;
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union {
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support::ubig16_t SymbolType;
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CFileLanguageIdAndTypeIdType CFileLanguageIdAndTypeId;
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};
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XCOFF::StorageClass StorageClass;
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uint8_t NumberOfAuxEntries;
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};
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struct XCOFFStringTable {
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uint32_t Size;
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const char *Data;
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};
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struct XCOFFCsectAuxEnt32 {
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static constexpr uint8_t SymbolTypeMask = 0x07;
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static constexpr uint8_t SymbolAlignmentMask = 0xF8;
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static constexpr size_t SymbolAlignmentBitOffset = 3;
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support::ubig32_t
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SectionOrLength; // If the symbol type is XTY_SD or XTY_CM, the csect
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// length.
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// If the symbol type is XTY_LD, the symbol table
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// index of the containing csect.
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// If the symbol type is XTY_ER, 0.
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support::ubig32_t ParameterHashIndex;
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support::ubig16_t TypeChkSectNum;
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uint8_t SymbolAlignmentAndType;
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XCOFF::StorageMappingClass StorageMappingClass;
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support::ubig32_t StabInfoIndex;
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support::ubig16_t StabSectNum;
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uint16_t getAlignmentLog2() const {
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return (SymbolAlignmentAndType & SymbolAlignmentMask) >>
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SymbolAlignmentBitOffset;
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}
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uint8_t getSymbolType() const {
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return SymbolAlignmentAndType & SymbolTypeMask;
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}
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bool isLabel() const { return getSymbolType() == XCOFF::XTY_LD; }
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};
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struct XCOFFFileAuxEnt {
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typedef struct {
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support::big32_t Magic; // Zero indicates name in string table.
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support::ubig32_t Offset;
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char NamePad[XCOFF::FileNamePadSize];
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} NameInStrTblType;
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union {
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char Name[XCOFF::NameSize + XCOFF::FileNamePadSize];
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NameInStrTblType NameInStrTbl;
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};
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XCOFF::CFileStringType Type;
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uint8_t ReservedZeros[2];
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uint8_t AuxType; // 64-bit XCOFF file only.
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};
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struct XCOFFSectAuxEntForStat {
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support::ubig32_t SectionLength;
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support::ubig16_t NumberOfRelocEnt;
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support::ubig16_t NumberOfLineNum;
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uint8_t Pad[10];
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};
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struct XCOFFRelocation32 {
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// Masks for packing/unpacking the r_rsize field of relocations.
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// The msb is used to indicate if the bits being relocated are signed or
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// unsigned.
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static constexpr uint8_t XR_SIGN_INDICATOR_MASK = 0x80;
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// The 2nd msb is used to indicate that the binder has replaced/modified the
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// original instruction.
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static constexpr uint8_t XR_FIXUP_INDICATOR_MASK = 0x40;
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// The remaining bits specify the bit length of the relocatable reference
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// minus one.
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static constexpr uint8_t XR_BIASED_LENGTH_MASK = 0x3f;
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public:
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support::ubig32_t VirtualAddress;
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support::ubig32_t SymbolIndex;
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// Packed field, see XR_* masks for details of packing.
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uint8_t Info;
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XCOFF::RelocationType Type;
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public:
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bool isRelocationSigned() const;
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bool isFixupIndicated() const;
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// Returns the number of bits being relocated.
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uint8_t getRelocatedLength() const;
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};
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class XCOFFObjectFile : public ObjectFile {
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private:
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const void *FileHeader = nullptr;
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const void *SectionHeaderTable = nullptr;
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const XCOFFSymbolEntry *SymbolTblPtr = nullptr;
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XCOFFStringTable StringTable = {0, nullptr};
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const XCOFFFileHeader32 *fileHeader32() const;
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const XCOFFFileHeader64 *fileHeader64() const;
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const XCOFFSectionHeader32 *sectionHeaderTable32() const;
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const XCOFFSectionHeader64 *sectionHeaderTable64() const;
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size_t getFileHeaderSize() const;
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size_t getSectionHeaderSize() const;
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const XCOFFSectionHeader32 *toSection32(DataRefImpl Ref) const;
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const XCOFFSectionHeader64 *toSection64(DataRefImpl Ref) const;
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uintptr_t getSectionHeaderTableAddress() const;
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uintptr_t getEndOfSymbolTableAddress() const;
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// This returns a pointer to the start of the storage for the name field of
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// the 32-bit or 64-bit SectionHeader struct. This string is *not* necessarily
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// null-terminated.
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const char *getSectionNameInternal(DataRefImpl Sec) const;
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// This function returns string table entry.
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Expected<StringRef> getStringTableEntry(uint32_t Offset) const;
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static bool isReservedSectionNumber(int16_t SectionNumber);
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// Constructor and "create" factory function. The constructor is only a thin
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// wrapper around the base constructor. The "create" function fills out the
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// XCOFF-specific information and performs the error checking along the way.
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XCOFFObjectFile(unsigned Type, MemoryBufferRef Object);
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static Expected<std::unique_ptr<XCOFFObjectFile>> create(unsigned Type,
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MemoryBufferRef MBR);
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// Helper for parsing the StringTable. Returns an 'Error' if parsing failed
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// and an XCOFFStringTable if parsing succeeded.
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static Expected<XCOFFStringTable> parseStringTable(const XCOFFObjectFile *Obj,
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uint64_t Offset);
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// Make a friend so it can call the private 'create' function.
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friend Expected<std::unique_ptr<ObjectFile>>
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ObjectFile::createXCOFFObjectFile(MemoryBufferRef Object, unsigned FileType);
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void checkSectionAddress(uintptr_t Addr, uintptr_t TableAddr) const;
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public:
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static constexpr uint64_t InvalidRelocOffset =
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std::numeric_limits<uint64_t>::max();
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// Interface inherited from base classes.
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void moveSymbolNext(DataRefImpl &Symb) const override;
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Expected<uint32_t> getSymbolFlags(DataRefImpl Symb) const override;
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basic_symbol_iterator symbol_begin() const override;
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basic_symbol_iterator symbol_end() const override;
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Expected<StringRef> getSymbolName(DataRefImpl Symb) const override;
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Expected<uint64_t> getSymbolAddress(DataRefImpl Symb) const override;
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uint64_t getSymbolValueImpl(DataRefImpl Symb) const override;
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uint64_t getCommonSymbolSizeImpl(DataRefImpl Symb) const override;
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Expected<SymbolRef::Type> getSymbolType(DataRefImpl Symb) const override;
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Expected<section_iterator> getSymbolSection(DataRefImpl Symb) const override;
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void moveSectionNext(DataRefImpl &Sec) const override;
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Expected<StringRef> getSectionName(DataRefImpl Sec) const override;
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uint64_t getSectionAddress(DataRefImpl Sec) const override;
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uint64_t getSectionIndex(DataRefImpl Sec) const override;
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uint64_t getSectionSize(DataRefImpl Sec) const override;
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Expected<ArrayRef<uint8_t>>
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getSectionContents(DataRefImpl Sec) const override;
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uint64_t getSectionAlignment(DataRefImpl Sec) const override;
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bool isSectionCompressed(DataRefImpl Sec) const override;
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bool isSectionText(DataRefImpl Sec) const override;
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bool isSectionData(DataRefImpl Sec) const override;
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bool isSectionBSS(DataRefImpl Sec) const override;
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bool isSectionVirtual(DataRefImpl Sec) const override;
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relocation_iterator section_rel_begin(DataRefImpl Sec) const override;
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relocation_iterator section_rel_end(DataRefImpl Sec) const override;
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void moveRelocationNext(DataRefImpl &Rel) const override;
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/// \returns the relocation offset with the base address of the containing
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/// section as zero, or InvalidRelocOffset on errors (such as a relocation
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/// that does not refer to an address in any section).
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uint64_t getRelocationOffset(DataRefImpl Rel) const override;
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symbol_iterator getRelocationSymbol(DataRefImpl Rel) const override;
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uint64_t getRelocationType(DataRefImpl Rel) const override;
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void getRelocationTypeName(DataRefImpl Rel,
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SmallVectorImpl<char> &Result) const override;
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section_iterator section_begin() const override;
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section_iterator section_end() const override;
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uint8_t getBytesInAddress() const override;
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StringRef getFileFormatName() const override;
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Triple::ArchType getArch() const override;
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SubtargetFeatures getFeatures() const override;
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Expected<uint64_t> getStartAddress() const override;
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bool isRelocatableObject() const override;
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// Below here is the non-inherited interface.
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bool is64Bit() const;
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const XCOFFSymbolEntry *getPointerToSymbolTable() const {
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assert(!is64Bit() && "Symbol table handling not supported yet.");
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return SymbolTblPtr;
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}
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Expected<StringRef>
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getSymbolSectionName(const XCOFFSymbolEntry *SymEntPtr) const;
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const XCOFFSymbolEntry *toSymbolEntry(DataRefImpl Ref) const;
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// File header related interfaces.
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uint16_t getMagic() const;
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uint16_t getNumberOfSections() const;
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int32_t getTimeStamp() const;
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// Symbol table offset and entry count are handled differently between
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// XCOFF32 and XCOFF64.
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uint32_t getSymbolTableOffset32() const;
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uint64_t getSymbolTableOffset64() const;
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// Note that this value is signed and might return a negative value. Negative
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// values are reserved for future use.
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int32_t getRawNumberOfSymbolTableEntries32() const;
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// The sanitized value appropriate to use as an index into the symbol table.
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uint32_t getLogicalNumberOfSymbolTableEntries32() const;
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uint32_t getNumberOfSymbolTableEntries64() const;
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uint32_t getSymbolIndex(uintptr_t SymEntPtr) const;
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Expected<StringRef> getSymbolNameByIndex(uint32_t SymbolTableIndex) const;
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Expected<StringRef> getCFileName(const XCOFFFileAuxEnt *CFileEntPtr) const;
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uint16_t getOptionalHeaderSize() const;
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uint16_t getFlags() const;
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// Section header table related interfaces.
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ArrayRef<XCOFFSectionHeader32> sections32() const;
|
||
|
|
ArrayRef<XCOFFSectionHeader64> sections64() const;
|
||
|
|
|
||
|
|
int32_t getSectionFlags(DataRefImpl Sec) const;
|
||
|
|
Expected<DataRefImpl> getSectionByNum(int16_t Num) const;
|
||
|
|
|
||
|
|
void checkSymbolEntryPointer(uintptr_t SymbolEntPtr) const;
|
||
|
|
|
||
|
|
// Relocation-related interfaces.
|
||
|
|
Expected<uint32_t>
|
||
|
|
getLogicalNumberOfRelocationEntries(const XCOFFSectionHeader32 &Sec) const;
|
||
|
|
|
||
|
|
Expected<ArrayRef<XCOFFRelocation32>>
|
||
|
|
relocations(const XCOFFSectionHeader32 &) const;
|
||
|
|
|
||
|
|
static bool classof(const Binary *B) { return B->isXCOFF(); }
|
||
|
|
}; // XCOFFObjectFile
|
||
|
|
|
||
|
|
class XCOFFSymbolRef {
|
||
|
|
const DataRefImpl SymEntDataRef;
|
||
|
|
const XCOFFObjectFile *const OwningObjectPtr;
|
||
|
|
|
||
|
|
public:
|
||
|
|
XCOFFSymbolRef(DataRefImpl SymEntDataRef,
|
||
|
|
const XCOFFObjectFile *OwningObjectPtr)
|
||
|
|
: SymEntDataRef(SymEntDataRef), OwningObjectPtr(OwningObjectPtr){};
|
||
|
|
|
||
|
|
XCOFF::StorageClass getStorageClass() const;
|
||
|
|
uint8_t getNumberOfAuxEntries() const;
|
||
|
|
const XCOFFCsectAuxEnt32 *getXCOFFCsectAuxEnt32() const;
|
||
|
|
uint16_t getType() const;
|
||
|
|
int16_t getSectionNumber() const;
|
||
|
|
|
||
|
|
bool hasCsectAuxEnt() const;
|
||
|
|
bool isFunction() const;
|
||
|
|
};
|
||
|
|
|
||
|
|
class TBVectorExt {
|
||
|
|
friend class XCOFFTracebackTable;
|
||
|
|
|
||
|
|
uint16_t Data;
|
||
|
|
uint32_t VecParmsInfo;
|
||
|
|
|
||
|
|
TBVectorExt(StringRef TBvectorStrRef);
|
||
|
|
|
||
|
|
public:
|
||
|
|
uint8_t getNumberOfVRSaved() const;
|
||
|
|
bool isVRSavedOnStack() const;
|
||
|
|
bool hasVarArgs() const;
|
||
|
|
uint8_t getNumberOfVectorParms() const;
|
||
|
|
bool hasVMXInstruction() const;
|
||
|
|
SmallString<32> getVectorParmsInfoString() const;
|
||
|
|
};
|
||
|
|
|
||
|
|
/// This class provides methods to extract traceback table data from a buffer.
|
||
|
|
/// The various accessors may reference the buffer provided via the constructor.
|
||
|
|
|
||
|
|
class XCOFFTracebackTable {
|
||
|
|
const uint8_t *const TBPtr;
|
||
|
|
Optional<SmallString<32>> ParmsType;
|
||
|
|
Optional<uint32_t> TraceBackTableOffset;
|
||
|
|
Optional<uint32_t> HandlerMask;
|
||
|
|
Optional<uint32_t> NumOfCtlAnchors;
|
||
|
|
Optional<SmallVector<uint32_t, 8>> ControlledStorageInfoDisp;
|
||
|
|
Optional<StringRef> FunctionName;
|
||
|
|
Optional<uint8_t> AllocaRegister;
|
||
|
|
Optional<TBVectorExt> VecExt;
|
||
|
|
Optional<uint8_t> ExtensionTable;
|
||
|
|
|
||
|
|
XCOFFTracebackTable(const uint8_t *Ptr, uint64_t &Size, Error &Err);
|
||
|
|
public:
|
||
|
|
/// Parse an XCOFF Traceback Table from \a Ptr with \a Size bytes.
|
||
|
|
/// Returns an XCOFFTracebackTable upon successful parsing, otherwise an
|
||
|
|
/// Error is returned.
|
||
|
|
///
|
||
|
|
/// \param[in] Ptr
|
||
|
|
/// A pointer that points just past the initial 4 bytes of zeros at the
|
||
|
|
/// beginning of an XCOFF Traceback Table.
|
||
|
|
///
|
||
|
|
/// \param[in, out] Size
|
||
|
|
/// A pointer that points to the length of the XCOFF Traceback Table.
|
||
|
|
/// If the XCOFF Traceback Table is not parsed successfully or there are
|
||
|
|
/// extra bytes that are not recognized, \a Size will be updated to be the
|
||
|
|
/// size up to the end of the last successfully parsed field of the table.
|
||
|
|
static Expected<XCOFFTracebackTable> create(const uint8_t *Ptr,
|
||
|
|
uint64_t &Size);
|
||
|
|
uint8_t getVersion() const;
|
||
|
|
uint8_t getLanguageID() const;
|
||
|
|
|
||
|
|
bool isGlobalLinkage() const;
|
||
|
|
bool isOutOfLineEpilogOrPrologue() const;
|
||
|
|
bool hasTraceBackTableOffset() const;
|
||
|
|
bool isInternalProcedure() const;
|
||
|
|
bool hasControlledStorage() const;
|
||
|
|
bool isTOCless() const;
|
||
|
|
bool isFloatingPointPresent() const;
|
||
|
|
bool isFloatingPointOperationLogOrAbortEnabled() const;
|
||
|
|
|
||
|
|
bool isInterruptHandler() const;
|
||
|
|
bool isFuncNamePresent() const;
|
||
|
|
bool isAllocaUsed() const;
|
||
|
|
uint8_t getOnConditionDirective() const;
|
||
|
|
bool isCRSaved() const;
|
||
|
|
bool isLRSaved() const;
|
||
|
|
|
||
|
|
bool isBackChainStored() const;
|
||
|
|
bool isFixup() const;
|
||
|
|
uint8_t getNumOfFPRsSaved() const;
|
||
|
|
|
||
|
|
bool hasVectorInfo() const;
|
||
|
|
bool hasExtensionTable() const;
|
||
|
|
uint8_t getNumOfGPRsSaved() const;
|
||
|
|
|
||
|
|
uint8_t getNumberOfFixedParms() const;
|
||
|
|
|
||
|
|
uint8_t getNumberOfFPParms() const;
|
||
|
|
bool hasParmsOnStack() const;
|
||
|
|
|
||
|
|
const Optional<SmallString<32>> &getParmsType() const { return ParmsType; }
|
||
|
|
const Optional<uint32_t> &getTraceBackTableOffset() const {
|
||
|
|
return TraceBackTableOffset;
|
||
|
|
}
|
||
|
|
const Optional<uint32_t> &getHandlerMask() const { return HandlerMask; }
|
||
|
|
const Optional<uint32_t> &getNumOfCtlAnchors() { return NumOfCtlAnchors; }
|
||
|
|
const Optional<SmallVector<uint32_t, 8>> &getControlledStorageInfoDisp() {
|
||
|
|
return ControlledStorageInfoDisp;
|
||
|
|
}
|
||
|
|
const Optional<StringRef> &getFunctionName() const { return FunctionName; }
|
||
|
|
const Optional<uint8_t> &getAllocaRegister() const { return AllocaRegister; }
|
||
|
|
const Optional<TBVectorExt> &getVectorExt() const { return VecExt; }
|
||
|
|
const Optional<uint8_t> &getExtensionTable() const { return ExtensionTable; }
|
||
|
|
};
|
||
|
|
|
||
|
|
bool doesXCOFFTracebackTableBegin(ArrayRef<uint8_t> Bytes);
|
||
|
|
} // namespace object
|
||
|
|
} // namespace llvm
|
||
|
|
|
||
|
|
#endif // LLVM_OBJECT_XCOFFOBJECTFILE_H
|