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llvm-project/llvm/tools/llvm-readobj/XCOFFDumper.cpp

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//===-- XCOFFDumper.cpp - XCOFF dumping utility -----------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements an XCOFF specific dumper for llvm-readobj.
//
//===----------------------------------------------------------------------===//
#include "Error.h"
#include "ObjDumper.h"
#include "llvm-readobj.h"
#include "llvm/Object/XCOFFObjectFile.h"
#include "llvm/Support/ScopedPrinter.h"
using namespace llvm;
using namespace object;
namespace {
class XCOFFDumper : public ObjDumper {
enum {
SymbolTypeMask = 0x07,
SymbolAlignmentMask = 0xF8,
SymbolAlignmentBitOffset = 3
};
public:
XCOFFDumper(const XCOFFObjectFile &Obj, ScopedPrinter &Writer)
: ObjDumper(Writer), Obj(Obj) {}
void printFileHeaders() override;
void printSectionHeaders() override;
void printRelocations() override;
void printSymbols() override;
void printDynamicSymbols() override;
void printUnwindInfo() override;
void printStackMap() const override;
void printNeededLibraries() override;
private:
template <typename T> void printSectionHeaders(ArrayRef<T> Sections);
void printFileAuxEnt(const XCOFFFileAuxEnt *AuxEntPtr);
void printCsectAuxEnt32(const XCOFFCsectAuxEnt32 *AuxEntPtr);
void printSectAuxEntForStat(const XCOFFSectAuxEntForStat *AuxEntPtr);
void printSymbol(const SymbolRef &);
// Least significant 3 bits are reserved.
static constexpr unsigned SectionFlagsReservedMask = 0x7;
const XCOFFObjectFile &Obj;
};
} // anonymous namespace
void XCOFFDumper::printFileHeaders() {
DictScope DS(W, "FileHeader");
W.printHex("Magic", Obj.getMagic());
W.printNumber("NumberOfSections", Obj.getNumberOfSections());
// Negative timestamp values are reserved for future use.
int32_t TimeStamp = Obj.getTimeStamp();
if (TimeStamp > 0) {
// This handling of the time stamp assumes that the host system's time_t is
// compatible with AIX time_t. If a platform is not compatible, the lit
// tests will let us know.
time_t TimeDate = TimeStamp;
char FormattedTime[21] = {};
size_t BytesWritten =
strftime(FormattedTime, 21, "%Y-%m-%dT%H:%M:%SZ", gmtime(&TimeDate));
if (BytesWritten)
W.printHex("TimeStamp", FormattedTime, TimeStamp);
else
W.printHex("Timestamp", TimeStamp);
} else {
W.printHex("TimeStamp", TimeStamp == 0 ? "None" : "Reserved Value",
TimeStamp);
}
// The number of symbol table entries is an unsigned value in 64-bit objects
// and a signed value (with negative values being 'reserved') in 32-bit
// objects.
if (Obj.is64Bit()) {
W.printHex("SymbolTableOffset", Obj.getSymbolTableOffset64());
W.printNumber("SymbolTableEntries", Obj.getNumberOfSymbolTableEntries64());
} else {
W.printHex("SymbolTableOffset", Obj.getSymbolTableOffset32());
int32_t SymTabEntries = Obj.getRawNumberOfSymbolTableEntries32();
if (SymTabEntries >= 0)
W.printNumber("SymbolTableEntries", SymTabEntries);
else
W.printHex("SymbolTableEntries", "Reserved Value", SymTabEntries);
}
W.printHex("OptionalHeaderSize", Obj.getOptionalHeaderSize());
W.printHex("Flags", Obj.getFlags());
// TODO FIXME Add support for the auxiliary header (if any) once
// XCOFFObjectFile has the necessary support.
}
void XCOFFDumper::printSectionHeaders() {
if (Obj.is64Bit())
printSectionHeaders(Obj.sections64());
else
printSectionHeaders(Obj.sections32());
}
void XCOFFDumper::printRelocations() {
llvm_unreachable("Unimplemented functionality for XCOFFDumper");
}
static const EnumEntry<XCOFF::CFileStringType> FileStringType[] = {
#define ECase(X) \
{ #X, XCOFF::X }
ECase(XFT_FN), ECase(XFT_CT), ECase(XFT_CV), ECase(XFT_CD)
#undef ECase
};
void XCOFFDumper::printFileAuxEnt(const XCOFFFileAuxEnt *AuxEntPtr) {
if (Obj.is64Bit())
report_fatal_error(
"Printing for File Auxiliary Entry in 64-bit is unimplemented.");
StringRef FileName =
unwrapOrError(Obj.getFileName(), Obj.getCFileName(AuxEntPtr));
DictScope SymDs(W, "File Auxiliary Entry");
W.printNumber("Index",
Obj.getSymbolIndex(reinterpret_cast<uintptr_t>(AuxEntPtr)));
W.printString("Name", FileName);
W.printEnum("Type", static_cast<uint8_t>(AuxEntPtr->Type),
makeArrayRef(FileStringType));
}
static const EnumEntry<XCOFF::StorageMappingClass> CsectStorageMappingClass[] =
{
#define ECase(X) \
{ #X, XCOFF::X }
ECase(XMC_PR), ECase(XMC_RO), ECase(XMC_DB),
ECase(XMC_GL), ECase(XMC_XO), ECase(XMC_SV),
ECase(XMC_SV64), ECase(XMC_SV3264), ECase(XMC_TI),
ECase(XMC_TB), ECase(XMC_RW), ECase(XMC_TC0),
ECase(XMC_TC), ECase(XMC_TD), ECase(XMC_DS),
ECase(XMC_UA), ECase(XMC_BS), ECase(XMC_UC),
ECase(XMC_TL), ECase(XMC_TE)
#undef ECase
};
static const EnumEntry<XCOFF::SymbolType> CsectSymbolTypeClass[] = {
#define ECase(X) \
{ #X, XCOFF::X }
ECase(XTY_ER), ECase(XTY_SD), ECase(XTY_LD), ECase(XTY_CM)
#undef ECase
};
void XCOFFDumper::printCsectAuxEnt32(const XCOFFCsectAuxEnt32 *AuxEntPtr) {
assert(!Obj.is64Bit() && "32-bit interface called on 64-bit object file.");
DictScope SymDs(W, "CSECT Auxiliary Entry");
W.printNumber("Index",
Obj.getSymbolIndex(reinterpret_cast<uintptr_t>(AuxEntPtr)));
if ((AuxEntPtr->SymbolAlignmentAndType & SymbolTypeMask) == XCOFF::XTY_LD)
W.printNumber("ContainingCsectSymbolIndex", AuxEntPtr->SectionLen);
else
W.printNumber("SectionLen", AuxEntPtr->SectionLen);
W.printHex("ParameterHashIndex", AuxEntPtr->ParameterHashIndex);
W.printHex("TypeChkSectNum", AuxEntPtr->TypeChkSectNum);
// Print out symbol alignment and type.
W.printNumber("SymbolAlignmentLog2",
(AuxEntPtr->SymbolAlignmentAndType & SymbolAlignmentMask) >>
SymbolAlignmentBitOffset);
W.printEnum("SymbolType", AuxEntPtr->SymbolAlignmentAndType & SymbolTypeMask,
makeArrayRef(CsectSymbolTypeClass));
W.printEnum("StorageMappingClass",
static_cast<uint8_t>(AuxEntPtr->StorageMappingClass),
makeArrayRef(CsectStorageMappingClass));
W.printHex("StabInfoIndex", AuxEntPtr->StabInfoIndex);
W.printHex("StabSectNum", AuxEntPtr->StabSectNum);
}
void XCOFFDumper::printSectAuxEntForStat(
const XCOFFSectAuxEntForStat *AuxEntPtr) {
assert(!Obj.is64Bit() && "32-bit interface called on 64-bit object file.");
DictScope SymDs(W, "Sect Auxiliary Entry For Stat");
W.printNumber("Index",
Obj.getSymbolIndex(reinterpret_cast<uintptr_t>(AuxEntPtr)));
W.printNumber("SectionLength", AuxEntPtr->SectionLength);
// Unlike the corresponding fields in the section header, NumberOfRelocEnt
// and NumberOfLineNum do not handle values greater than 65535.
W.printNumber("NumberOfRelocEnt", AuxEntPtr->NumberOfRelocEnt);
W.printNumber("NumberOfLineNum", AuxEntPtr->NumberOfLineNum);
}
static const EnumEntry<XCOFF::StorageClass> SymStorageClass[] = {
#define ECase(X) \
{ #X, XCOFF::X }
ECase(C_NULL), ECase(C_AUTO), ECase(C_EXT), ECase(C_STAT),
ECase(C_REG), ECase(C_EXTDEF), ECase(C_LABEL), ECase(C_ULABEL),
ECase(C_MOS), ECase(C_ARG), ECase(C_STRTAG), ECase(C_MOU),
ECase(C_UNTAG), ECase(C_TPDEF), ECase(C_USTATIC), ECase(C_ENTAG),
ECase(C_MOE), ECase(C_REGPARM), ECase(C_FIELD), ECase(C_BLOCK),
ECase(C_FCN), ECase(C_EOS), ECase(C_FILE), ECase(C_LINE),
ECase(C_ALIAS), ECase(C_HIDDEN), ECase(C_HIDEXT), ECase(C_BINCL),
ECase(C_EINCL), ECase(C_INFO), ECase(C_WEAKEXT), ECase(C_DWARF),
ECase(C_GSYM), ECase(C_LSYM), ECase(C_PSYM), ECase(C_RSYM),
ECase(C_RPSYM), ECase(C_STSYM), ECase(C_TCSYM), ECase(C_BCOMM),
ECase(C_ECOML), ECase(C_ECOMM), ECase(C_DECL), ECase(C_ENTRY),
ECase(C_FUN), ECase(C_BSTAT), ECase(C_ESTAT), ECase(C_GTLS),
ECase(C_STTLS), ECase(C_EFCN)
#undef ECase
};
static StringRef GetSymbolValueName(XCOFF::StorageClass SC) {
switch (SC) {
case XCOFF::C_EXT:
case XCOFF::C_WEAKEXT:
case XCOFF::C_HIDEXT:
case XCOFF::C_STAT:
return "Value (RelocatableAddress)";
case XCOFF::C_FILE:
return "Value (SymbolTableIndex)";
case XCOFF::C_FCN:
case XCOFF::C_BLOCK:
case XCOFF::C_FUN:
case XCOFF::C_STSYM:
case XCOFF::C_BINCL:
case XCOFF::C_EINCL:
case XCOFF::C_INFO:
case XCOFF::C_BSTAT:
case XCOFF::C_LSYM:
case XCOFF::C_PSYM:
case XCOFF::C_RPSYM:
case XCOFF::C_RSYM:
case XCOFF::C_ECOML:
case XCOFF::C_DWARF:
assert(false && "This StorageClass for the symbol is not yet implemented.");
return "";
default:
return "Value";
}
}
static const EnumEntry<XCOFF::CFileLangId> CFileLangIdClass[] = {
#define ECase(X) \
{ #X, XCOFF::X }
ECase(TB_C), ECase(TB_CPLUSPLUS)
#undef ECase
};
static const EnumEntry<XCOFF::CFileCpuId> CFileCpuIdClass[] = {
#define ECase(X) \
{ #X, XCOFF::X }
ECase(TCPU_PPC64), ECase(TCPU_COM), ECase(TCPU_970)
#undef ECase
};
void XCOFFDumper::printSymbol(const SymbolRef &S) {
if (Obj.is64Bit())
report_fatal_error("64-bit support is unimplemented.");
DataRefImpl SymbolDRI = S.getRawDataRefImpl();
const XCOFFSymbolEntry *SymbolEntPtr = Obj.toSymbolEntry(SymbolDRI);
XCOFFSymbolRef XCOFFSymRef(SymbolDRI, &Obj);
uint8_t NumberOfAuxEntries = XCOFFSymRef.getNumberOfAuxEntries();
DictScope SymDs(W, "Symbol");
StringRef SymbolName =
unwrapOrError(Obj.getFileName(), Obj.getSymbolName(SymbolDRI));
W.printNumber("Index",
Obj.getSymbolIndex(reinterpret_cast<uintptr_t>(SymbolEntPtr)));
W.printString("Name", SymbolName);
W.printHex(GetSymbolValueName(SymbolEntPtr->StorageClass),
SymbolEntPtr->Value);
StringRef SectionName =
unwrapOrError(Obj.getFileName(), Obj.getSymbolSectionName(SymbolEntPtr));
W.printString("Section", SectionName);
if (XCOFFSymRef.getStorageClass() == XCOFF::C_FILE) {
W.printEnum("Source Language ID",
SymbolEntPtr->CFileLanguageIdAndTypeId.LanguageId,
makeArrayRef(CFileLangIdClass));
W.printEnum("CPU Version ID",
SymbolEntPtr->CFileLanguageIdAndTypeId.CpuTypeId,
makeArrayRef(CFileCpuIdClass));
} else
W.printHex("Type", SymbolEntPtr->SymbolType);
W.printEnum("StorageClass", static_cast<uint8_t>(SymbolEntPtr->StorageClass),
makeArrayRef(SymStorageClass));
W.printNumber("NumberOfAuxEntries", SymbolEntPtr->NumberOfAuxEntries);
if (NumberOfAuxEntries == 0)
return;
switch (XCOFFSymRef.getStorageClass()) {
case XCOFF::C_FILE:
// If the symbol is C_FILE and has auxiliary entries...
for (int i = 1; i <= NumberOfAuxEntries; i++) {
const XCOFFFileAuxEnt *FileAuxEntPtr =
reinterpret_cast<const XCOFFFileAuxEnt *>(SymbolEntPtr + i);
#ifndef NDEBUG
Obj.checkSymbolEntryPointer(reinterpret_cast<uintptr_t>(FileAuxEntPtr));
#endif
printFileAuxEnt(FileAuxEntPtr);
}
break;
case XCOFF::C_EXT:
case XCOFF::C_WEAKEXT:
case XCOFF::C_HIDEXT:
// If the symbol is for a function, and it has more than 1 auxiliary entry,
// then one of them must be function auxiliary entry which we do not
// support yet.
if (XCOFFSymRef.isFunction() && NumberOfAuxEntries >= 2)
report_fatal_error("Function auxiliary entry printing is unimplemented.");
// If there is more than 1 auxiliary entry, instead of printing out
// error information, print out the raw Auxiliary entry from 1st till
// the last - 1. The last one must be a CSECT Auxiliary Entry.
for (int i = 1; i < NumberOfAuxEntries; i++) {
W.startLine() << "!Unexpected raw auxiliary entry data:\n";
W.startLine() << format_bytes(
ArrayRef<uint8_t>(reinterpret_cast<const uint8_t *>(SymbolEntPtr + i),
XCOFF::SymbolTableEntrySize));
}
// The symbol's last auxiliary entry is a CSECT Auxiliary Entry.
printCsectAuxEnt32(XCOFFSymRef.getXCOFFCsectAuxEnt32());
break;
case XCOFF::C_STAT:
if (NumberOfAuxEntries > 1)
report_fatal_error(
"C_STAT symbol should not have more than 1 auxiliary entry.");
const XCOFFSectAuxEntForStat *StatAuxEntPtr;
StatAuxEntPtr =
reinterpret_cast<const XCOFFSectAuxEntForStat *>(SymbolEntPtr + 1);
#ifndef NDEBUG
Obj.checkSymbolEntryPointer(reinterpret_cast<uintptr_t>(StatAuxEntPtr));
#endif
printSectAuxEntForStat(StatAuxEntPtr);
break;
case XCOFF::C_DWARF:
case XCOFF::C_BLOCK:
case XCOFF::C_FCN:
report_fatal_error("Symbol table entry printing for this storage class "
"type is unimplemented.");
break;
default:
for (int i = 1; i <= NumberOfAuxEntries; i++) {
W.startLine() << "!Unexpected raw auxiliary entry data:\n";
W.startLine() << format_bytes(
ArrayRef<uint8_t>(reinterpret_cast<const uint8_t *>(SymbolEntPtr + i),
XCOFF::SymbolTableEntrySize));
}
break;
}
}
void XCOFFDumper::printSymbols() {
ListScope Group(W, "Symbols");
for (const SymbolRef &S : Obj.symbols())
printSymbol(S);
}
void XCOFFDumper::printDynamicSymbols() {
llvm_unreachable("Unimplemented functionality for XCOFFDumper");
}
void XCOFFDumper::printUnwindInfo() {
llvm_unreachable("Unimplemented functionality for XCOFFDumper");
}
void XCOFFDumper::printStackMap() const {
llvm_unreachable("Unimplemented functionality for XCOFFDumper");
}
void XCOFFDumper::printNeededLibraries() {
llvm_unreachable("Unimplemented functionality for XCOFFDumper");
}
static const EnumEntry<XCOFF::SectionTypeFlags> SectionTypeFlagsNames[] = {
#define ECase(X) \
{ #X, XCOFF::X }
ECase(STYP_PAD), ECase(STYP_DWARF), ECase(STYP_TEXT),
ECase(STYP_DATA), ECase(STYP_BSS), ECase(STYP_EXCEPT),
ECase(STYP_INFO), ECase(STYP_TDATA), ECase(STYP_TBSS),
ECase(STYP_LOADER), ECase(STYP_DEBUG), ECase(STYP_TYPCHK),
ECase(STYP_OVRFLO)
#undef ECase
};
template <typename T>
void XCOFFDumper::printSectionHeaders(ArrayRef<T> Sections) {
ListScope Group(W, "Sections");
uint16_t Index = 1;
for (const T &Sec : Sections) {
DictScope SecDS(W, "Section");
W.printNumber("Index", Index++);
W.printString("Name", Sec.getName());
W.printHex("PhysicalAddress", Sec.PhysicalAddress);
W.printHex("VirtualAddress", Sec.VirtualAddress);
W.printHex("Size", Sec.SectionSize);
W.printHex("RawDataOffset", Sec.FileOffsetToRawData);
W.printHex("RelocationPointer", Sec.FileOffsetToRelocationInfo);
W.printHex("LineNumberPointer", Sec.FileOffsetToLineNumberInfo);
// TODO Need to add overflow handling when NumberOfX == _OVERFLOW_MARKER
// in 32-bit object files.
W.printNumber("NumberOfRelocations", Sec.NumberOfRelocations);
W.printNumber("NumberOfLineNumbers", Sec.NumberOfLineNumbers);
// The most significant 16-bits represent the DWARF section subtype. For
// now we just dump the section type flags.
uint16_t Flags = Sec.Flags & 0xffffu;
if (Flags & SectionFlagsReservedMask)
W.printHex("Flags", "Reserved", Flags);
else
W.printEnum("Type", Flags, makeArrayRef(SectionTypeFlagsNames));
}
if (opts::SectionRelocations)
report_fatal_error("Dumping section relocations is unimplemented");
if (opts::SectionSymbols)
report_fatal_error("Dumping symbols is unimplemented");
if (opts::SectionData)
report_fatal_error("Dumping section data is unimplemented");
}
namespace llvm {
std::error_code createXCOFFDumper(const object::ObjectFile *Obj,
ScopedPrinter &Writer,
std::unique_ptr<ObjDumper> &Result) {
const XCOFFObjectFile *XObj = dyn_cast<XCOFFObjectFile>(Obj);
if (!XObj)
return readobj_error::unsupported_obj_file_format;
Result.reset(new XCOFFDumper(*XObj, Writer));
return readobj_error::success;
}
} // namespace llvm
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