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213fb8f11e
Should fix the build. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199081 91177308-0d34-0410-b5e6-96231b3b80d8
272 lines
9.2 KiB
C++
272 lines
9.2 KiB
C++
//===--- ARMEHABIPrinter.h - ARM EHABI Unwind Information Printer ----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_READOBJ_ARMEHABI_PRINTER_H
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#define LLVM_READOBJ_ARMEHABI_PRINTER_H
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#include "Error.h"
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#include "StreamWriter.h"
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#include "llvm/Object/ELF.h"
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#include "llvm/Object/ELFTypes.h"
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#include "llvm/Support/ARMEHABI.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/type_traits.h"
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namespace llvm {
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namespace ARM {
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namespace EHABI {
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template <typename ET>
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class PrinterContext {
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StreamWriter &SW;
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const object::ELFFile<ET> *ELF;
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typedef typename object::ELFFile<ET>::Elf_Sym Elf_Sym;
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typedef typename object::ELFFile<ET>::Elf_Shdr Elf_Shdr;
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typedef typename object::ELFFile<ET>::Elf_Rel_Iter Elf_Rel_iterator;
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typedef typename object::ELFFile<ET>::Elf_Sym_Iter Elf_Sym_iterator;
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typedef typename object::ELFFile<ET>::Elf_Shdr_Iter Elf_Shdr_iterator;
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static const size_t IndexTableEntrySize;
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static uint64_t PREL31(uint32_t Address, uint32_t Place) {
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uint64_t Location = Address & 0x7fffffff;
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if (Location & 0x04000000)
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Location |= (uint64_t) ~0x7fffffff;
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return Location + Place;
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}
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ErrorOr<StringRef> FunctionAtAddress(unsigned Section, uint64_t Address) const;
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const Elf_Shdr *FindExceptionTable(unsigned IndexTableIndex,
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off_t IndexTableOffset) const;
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void PrintIndexTable(unsigned SectionIndex, const Elf_Shdr *IT) const;
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void PrintExceptionTable(const Elf_Shdr *IT, const Elf_Shdr *EHT,
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uint64_t TableEntryOffset) const;
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void PrintOpcodes(const uint8_t *Entry, size_t Length, off_t Offset) const;
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public:
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PrinterContext(StreamWriter &Writer, const object::ELFFile<ET> *File)
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: SW(Writer), ELF(File) {}
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void PrintUnwindInformation() const;
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};
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template <typename ET>
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const size_t PrinterContext<ET>::IndexTableEntrySize = 8;
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template <typename ET>
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ErrorOr<StringRef> PrinterContext<ET>::FunctionAtAddress(unsigned Section,
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uint64_t Address) const {
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for (Elf_Sym_iterator SI = ELF->begin_symbols(), SE = ELF->end_symbols();
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SI != SE; ++SI)
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if (SI->st_shndx == Section && SI->st_value == Address &&
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SI->getType() == ELF::STT_FUNC)
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return ELF->getSymbolName(SI);
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return readobj_error::unknown_symbol;
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}
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template <typename ET>
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const typename object::ELFFile<ET>::Elf_Shdr *
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PrinterContext<ET>::FindExceptionTable(unsigned IndexSectionIndex,
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off_t IndexTableOffset) const {
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/// Iterate through the sections, searching for the relocation section
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/// associated with the unwind index table section specified by
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/// IndexSectionIndex. Iterate the associated section searching for the
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/// relocation associated with the index table entry specified by
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/// IndexTableOffset. The symbol is the section symbol for the exception
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/// handling table. Use this symbol to recover the actual exception handling
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/// table.
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for (Elf_Shdr_iterator SI = ELF->begin_sections(), SE = ELF->end_sections();
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SI != SE; ++SI) {
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if (SI->sh_type == ELF::SHT_REL && SI->sh_info == IndexSectionIndex) {
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for (Elf_Rel_iterator RI = ELF->begin_rel(&*SI), RE = ELF->end_rel(&*SI);
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RI != RE; ++RI) {
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if (RI->r_offset == IndexTableOffset) {
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typename object::ELFFile<ET>::Elf_Rela RelA;
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RelA.r_offset = RI->r_offset;
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RelA.r_info = RI->r_info;
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RelA.r_addend = 0;
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std::pair<const Elf_Shdr *, const Elf_Sym *> Symbol =
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ELF->getRelocationSymbol(&(*SI), &RelA);
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return ELF->getSection(Symbol.second);
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}
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}
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}
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}
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return NULL;
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}
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template <typename ET>
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void PrinterContext<ET>::PrintExceptionTable(const Elf_Shdr *IT,
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const Elf_Shdr *EHT,
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uint64_t TableEntryOffset) const {
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ErrorOr<ArrayRef<uint8_t> > Contents = ELF->getSectionContents(EHT);
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if (!Contents)
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return;
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/// ARM EHABI Section 6.2 - The generic model
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///
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/// An exception-handling table entry for the generic model is laid out as:
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///
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/// 3 3
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/// 1 0 0
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/// +-+------------------------------+
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/// |0| personality routine offset |
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/// +-+------------------------------+
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/// | personality routine data ... |
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///
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///
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/// ARM EHABI Section 6.3 - The ARM-defined compact model
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///
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/// An exception-handling table entry for the compact model looks like:
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///
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/// 3 3 2 2 2 2
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/// 1 0 8 7 4 3 0
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/// +-+---+----+-----------------------+
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/// |1| 0 | Ix | data for pers routine |
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/// +-+---+----+-----------------------+
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/// | more personality routine data |
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const support::ulittle32_t Word =
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*reinterpret_cast<const support::ulittle32_t *>(Contents->data() + TableEntryOffset);
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if (Word & 0x80000000) {
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SW.printString("Model", StringRef("Compact"));
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unsigned PersonalityIndex = (Word & 0x0f000000) >> 24;
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SW.printNumber("PersonalityIndex", PersonalityIndex);
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switch (PersonalityIndex) {
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case AEABI_UNWIND_CPP_PR0:
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llvm_unreachable("Personality 0 should be compact inline!");
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break;
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case AEABI_UNWIND_CPP_PR1:
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case AEABI_UNWIND_CPP_PR2:
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unsigned AdditionalWords = (Word & 0x00ff0000) >> 16;
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PrintOpcodes(Contents->data() + TableEntryOffset, 2 + 4 * AdditionalWords,
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2);
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break;
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}
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} else {
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SW.printString("Model", StringRef("Generic"));
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uint64_t Address = PREL31(Word, EHT->sh_addr);
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SW.printHex("PersonalityRoutineAddress", Address);
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if (ErrorOr<StringRef> Name = FunctionAtAddress(EHT->sh_link, Address))
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SW.printString("PersonalityRoutineName", *Name);
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}
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}
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template <typename ET>
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void PrinterContext<ET>::PrintOpcodes(const uint8_t *Entry,
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size_t Length, off_t Offset) const {
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ListScope OCC(SW, "Opcodes");
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for (unsigned OCI = Offset; OCI < Length + Offset; OCI++)
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SW.printHex("Opcode", Entry[OCI ^ 0x3]);
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}
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template <typename ET>
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void PrinterContext<ET>::PrintIndexTable(unsigned SectionIndex,
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const Elf_Shdr *IT) const {
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ErrorOr<ArrayRef<uint8_t> > Contents = ELF->getSectionContents(IT);
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if (!Contents)
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return;
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/// ARM EHABI Section 5 - Index Table Entries
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/// * The first word contains a PREL31 offset to the start of a function with
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/// bit 31 clear
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/// * The second word contains one of:
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/// - The PREL31 offset of the start of the table entry for the function,
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/// with bit 31 clear
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/// - The exception-handling table entry itself with bit 31 set
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/// - The special bit pattern EXIDX_CANTUNWIND, indicating that associated
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/// frames cannot be unwound
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const support::ulittle32_t *Data =
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reinterpret_cast<const support::ulittle32_t *>(Contents->data());
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const unsigned Entries = IT->sh_size / IndexTableEntrySize;
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ListScope E(SW, "Entries");
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for (unsigned Entry = 0; Entry < Entries; ++Entry) {
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DictScope E(SW, "Entry");
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const support::ulittle32_t Word0 =
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Data[Entry * (IndexTableEntrySize / sizeof(*Data)) + 0];
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const support::ulittle32_t Word1 =
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Data[Entry * (IndexTableEntrySize / sizeof(*Data)) + 1];
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if (Word0 & 0x80000000) {
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errs() << "corrupt unwind data in section " << SectionIndex << "\n";
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continue;
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}
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const uint64_t Offset = PREL31(Word0, IT->sh_addr);
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SW.printHex("FunctionAddress", Offset);
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if (ErrorOr<StringRef> Name = FunctionAtAddress(IT->sh_link, Offset))
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SW.printString("FunctionName", *Name);
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if (Word1 == EXIDX_CANTUNWIND) {
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SW.printString("Model", StringRef("CantUnwind"));
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continue;
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}
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if (Word1 & 0x80000000) {
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SW.printString("Model", StringRef("Compact (Inline)"));
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unsigned PersonalityIndex = (Word1 & 0x0f000000) >> 24;
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SW.printNumber("PersonalityIndex", PersonalityIndex);
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PrintOpcodes(Contents->data() + Entry * IndexTableEntrySize + 4, 3, 1);
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} else {
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const Elf_Shdr *EHT =
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FindExceptionTable(SectionIndex, Entry * IndexTableEntrySize + 4);
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if (ErrorOr<StringRef> Name = ELF->getSectionName(EHT))
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SW.printString("ExceptionHandlingTable", *Name);
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uint64_t TableEntryOffset = PREL31(Word1, IT->sh_addr);
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SW.printHex("TableEntryOffset", TableEntryOffset);
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PrintExceptionTable(IT, EHT, TableEntryOffset);
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}
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}
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}
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template <typename ET>
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void PrinterContext<ET>::PrintUnwindInformation() const {
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DictScope UI(SW, "UnwindInformation");
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int SectionIndex = 0;
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for (Elf_Shdr_iterator SI = ELF->begin_sections(), SE = ELF->end_sections();
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SI != SE; ++SI, ++SectionIndex) {
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if (SI->sh_type == ELF::SHT_ARM_EXIDX) {
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const Elf_Shdr *IT = &(*SI);
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DictScope UIT(SW, "UnwindIndexTable");
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SW.printNumber("SectionIndex", SectionIndex);
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if (ErrorOr<StringRef> SectionName = ELF->getSectionName(IT))
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SW.printString("SectionName", *SectionName);
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SW.printHex("SectionOffset", IT->sh_offset);
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PrintIndexTable(SectionIndex, IT);
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}
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}
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}
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}
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}
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}
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#endif
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