569 lines
16 KiB
C++
569 lines
16 KiB
C++
//===- ELF.cpp - ELF object file implementation ---------------------------===//
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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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#include "llvm/Object/ELF.h"
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#include "llvm/BinaryFormat/ELF.h"
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#include "llvm/Support/LEB128.h"
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using namespace llvm;
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using namespace object;
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#define STRINGIFY_ENUM_CASE(ns, name) \
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case ns::name: \
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return #name;
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#define ELF_RELOC(name, value) STRINGIFY_ENUM_CASE(ELF, name)
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StringRef llvm::object::getELFRelocationTypeName(uint32_t Machine,
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uint32_t Type) {
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switch (Machine) {
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case ELF::EM_X86_64:
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switch (Type) {
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#include "llvm/BinaryFormat/ELFRelocs/x86_64.def"
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default:
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break;
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}
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break;
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case ELF::EM_386:
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case ELF::EM_IAMCU:
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switch (Type) {
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#include "llvm/BinaryFormat/ELFRelocs/i386.def"
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default:
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break;
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}
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break;
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case ELF::EM_MIPS:
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switch (Type) {
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#include "llvm/BinaryFormat/ELFRelocs/Mips.def"
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default:
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break;
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}
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break;
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case ELF::EM_AARCH64:
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switch (Type) {
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#include "llvm/BinaryFormat/ELFRelocs/AArch64.def"
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default:
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break;
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}
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break;
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case ELF::EM_ARM:
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switch (Type) {
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#include "llvm/BinaryFormat/ELFRelocs/ARM.def"
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default:
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break;
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}
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break;
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case ELF::EM_ARC_COMPACT:
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case ELF::EM_ARC_COMPACT2:
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switch (Type) {
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#include "llvm/BinaryFormat/ELFRelocs/ARC.def"
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default:
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break;
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}
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break;
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case ELF::EM_AVR:
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switch (Type) {
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#include "llvm/BinaryFormat/ELFRelocs/AVR.def"
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default:
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break;
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}
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break;
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case ELF::EM_HEXAGON:
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switch (Type) {
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#include "llvm/BinaryFormat/ELFRelocs/Hexagon.def"
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default:
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break;
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}
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break;
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case ELF::EM_LANAI:
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switch (Type) {
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#include "llvm/BinaryFormat/ELFRelocs/Lanai.def"
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default:
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break;
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}
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break;
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case ELF::EM_PPC:
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switch (Type) {
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#include "llvm/BinaryFormat/ELFRelocs/PowerPC.def"
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default:
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break;
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}
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break;
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case ELF::EM_PPC64:
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switch (Type) {
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#include "llvm/BinaryFormat/ELFRelocs/PowerPC64.def"
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default:
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break;
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}
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break;
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case ELF::EM_RISCV:
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switch (Type) {
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#include "llvm/BinaryFormat/ELFRelocs/RISCV.def"
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default:
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break;
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}
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break;
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case ELF::EM_S390:
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switch (Type) {
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#include "llvm/BinaryFormat/ELFRelocs/SystemZ.def"
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default:
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break;
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}
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break;
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case ELF::EM_SPARC:
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case ELF::EM_SPARC32PLUS:
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case ELF::EM_SPARCV9:
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switch (Type) {
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#include "llvm/BinaryFormat/ELFRelocs/Sparc.def"
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default:
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break;
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}
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break;
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case ELF::EM_AMDGPU:
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switch (Type) {
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#include "llvm/BinaryFormat/ELFRelocs/AMDGPU.def"
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default:
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break;
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}
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break;
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case ELF::EM_BPF:
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switch (Type) {
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#include "llvm/BinaryFormat/ELFRelocs/BPF.def"
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default:
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break;
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}
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break;
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case ELF::EM_MSP430:
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switch (Type) {
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#include "llvm/BinaryFormat/ELFRelocs/MSP430.def"
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default:
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break;
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}
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break;
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default:
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break;
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}
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return "Unknown";
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}
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#undef ELF_RELOC
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uint32_t llvm::object::getELFRelativeRelocationType(uint32_t Machine) {
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switch (Machine) {
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case ELF::EM_X86_64:
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return ELF::R_X86_64_RELATIVE;
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case ELF::EM_386:
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case ELF::EM_IAMCU:
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return ELF::R_386_RELATIVE;
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case ELF::EM_MIPS:
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break;
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case ELF::EM_AARCH64:
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return ELF::R_AARCH64_RELATIVE;
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case ELF::EM_ARM:
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return ELF::R_ARM_RELATIVE;
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case ELF::EM_ARC_COMPACT:
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case ELF::EM_ARC_COMPACT2:
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return ELF::R_ARC_RELATIVE;
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case ELF::EM_AVR:
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break;
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case ELF::EM_HEXAGON:
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return ELF::R_HEX_RELATIVE;
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case ELF::EM_LANAI:
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break;
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case ELF::EM_PPC:
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break;
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case ELF::EM_PPC64:
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return ELF::R_PPC64_RELATIVE;
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case ELF::EM_RISCV:
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return ELF::R_RISCV_RELATIVE;
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case ELF::EM_S390:
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return ELF::R_390_RELATIVE;
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case ELF::EM_SPARC:
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case ELF::EM_SPARC32PLUS:
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case ELF::EM_SPARCV9:
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return ELF::R_SPARC_RELATIVE;
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case ELF::EM_AMDGPU:
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break;
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case ELF::EM_BPF:
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break;
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default:
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break;
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}
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return 0;
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}
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StringRef llvm::object::getELFSectionTypeName(uint32_t Machine, unsigned Type) {
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switch (Machine) {
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case ELF::EM_ARM:
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switch (Type) {
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STRINGIFY_ENUM_CASE(ELF, SHT_ARM_EXIDX);
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STRINGIFY_ENUM_CASE(ELF, SHT_ARM_PREEMPTMAP);
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STRINGIFY_ENUM_CASE(ELF, SHT_ARM_ATTRIBUTES);
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STRINGIFY_ENUM_CASE(ELF, SHT_ARM_DEBUGOVERLAY);
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STRINGIFY_ENUM_CASE(ELF, SHT_ARM_OVERLAYSECTION);
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}
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break;
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case ELF::EM_HEXAGON:
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switch (Type) { STRINGIFY_ENUM_CASE(ELF, SHT_HEX_ORDERED); }
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break;
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case ELF::EM_X86_64:
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switch (Type) { STRINGIFY_ENUM_CASE(ELF, SHT_X86_64_UNWIND); }
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break;
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case ELF::EM_MIPS:
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case ELF::EM_MIPS_RS3_LE:
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switch (Type) {
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STRINGIFY_ENUM_CASE(ELF, SHT_MIPS_REGINFO);
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STRINGIFY_ENUM_CASE(ELF, SHT_MIPS_OPTIONS);
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STRINGIFY_ENUM_CASE(ELF, SHT_MIPS_ABIFLAGS);
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STRINGIFY_ENUM_CASE(ELF, SHT_MIPS_DWARF);
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}
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break;
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default:
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break;
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}
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switch (Type) {
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STRINGIFY_ENUM_CASE(ELF, SHT_NULL);
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STRINGIFY_ENUM_CASE(ELF, SHT_PROGBITS);
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STRINGIFY_ENUM_CASE(ELF, SHT_SYMTAB);
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STRINGIFY_ENUM_CASE(ELF, SHT_STRTAB);
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STRINGIFY_ENUM_CASE(ELF, SHT_RELA);
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STRINGIFY_ENUM_CASE(ELF, SHT_HASH);
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STRINGIFY_ENUM_CASE(ELF, SHT_DYNAMIC);
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STRINGIFY_ENUM_CASE(ELF, SHT_NOTE);
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STRINGIFY_ENUM_CASE(ELF, SHT_NOBITS);
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STRINGIFY_ENUM_CASE(ELF, SHT_REL);
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STRINGIFY_ENUM_CASE(ELF, SHT_SHLIB);
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STRINGIFY_ENUM_CASE(ELF, SHT_DYNSYM);
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STRINGIFY_ENUM_CASE(ELF, SHT_INIT_ARRAY);
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STRINGIFY_ENUM_CASE(ELF, SHT_FINI_ARRAY);
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STRINGIFY_ENUM_CASE(ELF, SHT_PREINIT_ARRAY);
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STRINGIFY_ENUM_CASE(ELF, SHT_GROUP);
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STRINGIFY_ENUM_CASE(ELF, SHT_SYMTAB_SHNDX);
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STRINGIFY_ENUM_CASE(ELF, SHT_RELR);
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STRINGIFY_ENUM_CASE(ELF, SHT_ANDROID_REL);
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STRINGIFY_ENUM_CASE(ELF, SHT_ANDROID_RELA);
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STRINGIFY_ENUM_CASE(ELF, SHT_ANDROID_RELR);
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STRINGIFY_ENUM_CASE(ELF, SHT_LLVM_ODRTAB);
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STRINGIFY_ENUM_CASE(ELF, SHT_LLVM_LINKER_OPTIONS);
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STRINGIFY_ENUM_CASE(ELF, SHT_LLVM_CALL_GRAPH_PROFILE);
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STRINGIFY_ENUM_CASE(ELF, SHT_LLVM_ADDRSIG);
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STRINGIFY_ENUM_CASE(ELF, SHT_GNU_ATTRIBUTES);
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STRINGIFY_ENUM_CASE(ELF, SHT_GNU_HASH);
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STRINGIFY_ENUM_CASE(ELF, SHT_GNU_verdef);
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STRINGIFY_ENUM_CASE(ELF, SHT_GNU_verneed);
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STRINGIFY_ENUM_CASE(ELF, SHT_GNU_versym);
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default:
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return "Unknown";
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}
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}
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template <class ELFT>
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Expected<std::vector<typename ELFT::Rela>>
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ELFFile<ELFT>::decode_relrs(Elf_Relr_Range relrs) const {
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// This function decodes the contents of an SHT_RELR packed relocation
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// section.
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//
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// Proposal for adding SHT_RELR sections to generic-abi is here:
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// https://groups.google.com/forum/#!topic/generic-abi/bX460iggiKg
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//
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// The encoded sequence of Elf64_Relr entries in a SHT_RELR section looks
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// like [ AAAAAAAA BBBBBBB1 BBBBBBB1 ... AAAAAAAA BBBBBB1 ... ]
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//
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// i.e. start with an address, followed by any number of bitmaps. The address
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// entry encodes 1 relocation. The subsequent bitmap entries encode up to 63
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// relocations each, at subsequent offsets following the last address entry.
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//
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// The bitmap entries must have 1 in the least significant bit. The assumption
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// here is that an address cannot have 1 in lsb. Odd addresses are not
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// supported.
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//
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// Excluding the least significant bit in the bitmap, each non-zero bit in
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// the bitmap represents a relocation to be applied to a corresponding machine
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// word that follows the base address word. The second least significant bit
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// represents the machine word immediately following the initial address, and
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// each bit that follows represents the next word, in linear order. As such,
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// a single bitmap can encode up to 31 relocations in a 32-bit object, and
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// 63 relocations in a 64-bit object.
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//
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// This encoding has a couple of interesting properties:
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// 1. Looking at any entry, it is clear whether it's an address or a bitmap:
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// even means address, odd means bitmap.
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// 2. Just a simple list of addresses is a valid encoding.
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Elf_Rela Rela;
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Rela.r_info = 0;
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Rela.r_addend = 0;
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Rela.setType(getRelativeRelocationType(), false);
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std::vector<Elf_Rela> Relocs;
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// Word type: uint32_t for Elf32, and uint64_t for Elf64.
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typedef typename ELFT::uint Word;
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// Word size in number of bytes.
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const size_t WordSize = sizeof(Word);
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// Number of bits used for the relocation offsets bitmap.
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// These many relative relocations can be encoded in a single entry.
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const size_t NBits = 8*WordSize - 1;
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Word Base = 0;
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for (const Elf_Relr &R : relrs) {
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Word Entry = R;
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if ((Entry&1) == 0) {
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// Even entry: encodes the offset for next relocation.
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Rela.r_offset = Entry;
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Relocs.push_back(Rela);
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// Set base offset for subsequent bitmap entries.
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Base = Entry + WordSize;
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continue;
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}
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// Odd entry: encodes bitmap for relocations starting at base.
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Word Offset = Base;
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while (Entry != 0) {
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Entry >>= 1;
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if ((Entry&1) != 0) {
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Rela.r_offset = Offset;
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Relocs.push_back(Rela);
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}
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Offset += WordSize;
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}
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// Advance base offset by NBits words.
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Base += NBits * WordSize;
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}
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return Relocs;
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}
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template <class ELFT>
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Expected<std::vector<typename ELFT::Rela>>
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ELFFile<ELFT>::android_relas(const Elf_Shdr *Sec) const {
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// This function reads relocations in Android's packed relocation format,
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// which is based on SLEB128 and delta encoding.
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Expected<ArrayRef<uint8_t>> ContentsOrErr = getSectionContents(Sec);
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if (!ContentsOrErr)
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return ContentsOrErr.takeError();
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const uint8_t *Cur = ContentsOrErr->begin();
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const uint8_t *End = ContentsOrErr->end();
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if (ContentsOrErr->size() < 4 || Cur[0] != 'A' || Cur[1] != 'P' ||
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Cur[2] != 'S' || Cur[3] != '2')
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return createError("invalid packed relocation header");
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Cur += 4;
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const char *ErrStr = nullptr;
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auto ReadSLEB = [&]() -> int64_t {
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if (ErrStr)
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return 0;
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unsigned Len;
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int64_t Result = decodeSLEB128(Cur, &Len, End, &ErrStr);
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Cur += Len;
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return Result;
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};
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uint64_t NumRelocs = ReadSLEB();
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uint64_t Offset = ReadSLEB();
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uint64_t Addend = 0;
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if (ErrStr)
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return createError(ErrStr);
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std::vector<Elf_Rela> Relocs;
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Relocs.reserve(NumRelocs);
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while (NumRelocs) {
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uint64_t NumRelocsInGroup = ReadSLEB();
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if (NumRelocsInGroup > NumRelocs)
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return createError("relocation group unexpectedly large");
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NumRelocs -= NumRelocsInGroup;
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uint64_t GroupFlags = ReadSLEB();
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bool GroupedByInfo = GroupFlags & ELF::RELOCATION_GROUPED_BY_INFO_FLAG;
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bool GroupedByOffsetDelta = GroupFlags & ELF::RELOCATION_GROUPED_BY_OFFSET_DELTA_FLAG;
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bool GroupedByAddend = GroupFlags & ELF::RELOCATION_GROUPED_BY_ADDEND_FLAG;
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bool GroupHasAddend = GroupFlags & ELF::RELOCATION_GROUP_HAS_ADDEND_FLAG;
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uint64_t GroupOffsetDelta;
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if (GroupedByOffsetDelta)
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GroupOffsetDelta = ReadSLEB();
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uint64_t GroupRInfo;
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if (GroupedByInfo)
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GroupRInfo = ReadSLEB();
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if (GroupedByAddend && GroupHasAddend)
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Addend += ReadSLEB();
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if (!GroupHasAddend)
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Addend = 0;
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for (uint64_t I = 0; I != NumRelocsInGroup; ++I) {
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Elf_Rela R;
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Offset += GroupedByOffsetDelta ? GroupOffsetDelta : ReadSLEB();
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R.r_offset = Offset;
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R.r_info = GroupedByInfo ? GroupRInfo : ReadSLEB();
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if (GroupHasAddend && !GroupedByAddend)
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Addend += ReadSLEB();
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R.r_addend = Addend;
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Relocs.push_back(R);
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if (ErrStr)
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return createError(ErrStr);
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}
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if (ErrStr)
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return createError(ErrStr);
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}
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return Relocs;
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}
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template <class ELFT>
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const char *ELFFile<ELFT>::getDynamicTagAsString(unsigned Arch,
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uint64_t Type) const {
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#define DYNAMIC_STRINGIFY_ENUM(tag, value) \
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case value: \
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return #tag;
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#define DYNAMIC_TAG(n, v)
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switch (Arch) {
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case ELF::EM_HEXAGON:
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switch (Type) {
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#define HEXAGON_DYNAMIC_TAG(name, value) DYNAMIC_STRINGIFY_ENUM(name, value)
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#include "llvm/BinaryFormat/DynamicTags.def"
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#undef HEXAGON_DYNAMIC_TAG
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}
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case ELF::EM_MIPS:
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switch (Type) {
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#define MIPS_DYNAMIC_TAG(name, value) DYNAMIC_STRINGIFY_ENUM(name, value)
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#include "llvm/BinaryFormat/DynamicTags.def"
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#undef MIPS_DYNAMIC_TAG
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}
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case ELF::EM_PPC64:
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switch (Type) {
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#define PPC64_DYNAMIC_TAG(name, value) DYNAMIC_STRINGIFY_ENUM(name, value)
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#include "llvm/BinaryFormat/DynamicTags.def"
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#undef PPC64_DYNAMIC_TAG
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}
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}
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#undef DYNAMIC_TAG
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switch (Type) {
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// Now handle all dynamic tags except the architecture specific ones
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#define MIPS_DYNAMIC_TAG(name, value)
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#define HEXAGON_DYNAMIC_TAG(name, value)
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#define PPC64_DYNAMIC_TAG(name, value)
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// Also ignore marker tags such as DT_HIOS (maps to DT_VERNEEDNUM), etc.
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#define DYNAMIC_TAG_MARKER(name, value)
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#define DYNAMIC_TAG(name, value) DYNAMIC_STRINGIFY_ENUM(name, value)
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#include "llvm/BinaryFormat/DynamicTags.def"
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#undef DYNAMIC_TAG
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#undef MIPS_DYNAMIC_TAG
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#undef HEXAGON_DYNAMIC_TAG
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#undef PPC64_DYNAMIC_TAG
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#undef DYNAMIC_TAG_MARKER
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#undef DYNAMIC_STRINGIFY_ENUM
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default:
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return "unknown";
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}
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}
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template <class ELFT>
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const char *ELFFile<ELFT>::getDynamicTagAsString(uint64_t Type) const {
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return getDynamicTagAsString(getHeader()->e_machine, Type);
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}
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template <class ELFT>
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Expected<typename ELFT::DynRange> ELFFile<ELFT>::dynamicEntries() const {
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ArrayRef<Elf_Dyn> Dyn;
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size_t DynSecSize = 0;
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auto ProgramHeadersOrError = program_headers();
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if (!ProgramHeadersOrError)
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return ProgramHeadersOrError.takeError();
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|
|
for (const Elf_Phdr &Phdr : *ProgramHeadersOrError) {
|
|
if (Phdr.p_type == ELF::PT_DYNAMIC) {
|
|
Dyn = makeArrayRef(
|
|
reinterpret_cast<const Elf_Dyn *>(base() + Phdr.p_offset),
|
|
Phdr.p_filesz / sizeof(Elf_Dyn));
|
|
DynSecSize = Phdr.p_filesz;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// If we can't find the dynamic section in the program headers, we just fall
|
|
// back on the sections.
|
|
if (Dyn.empty()) {
|
|
auto SectionsOrError = sections();
|
|
if (!SectionsOrError)
|
|
return SectionsOrError.takeError();
|
|
|
|
for (const Elf_Shdr &Sec : *SectionsOrError) {
|
|
if (Sec.sh_type == ELF::SHT_DYNAMIC) {
|
|
Expected<ArrayRef<Elf_Dyn>> DynOrError =
|
|
getSectionContentsAsArray<Elf_Dyn>(&Sec);
|
|
if (!DynOrError)
|
|
return DynOrError.takeError();
|
|
Dyn = *DynOrError;
|
|
DynSecSize = Sec.sh_size;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!Dyn.data())
|
|
return ArrayRef<Elf_Dyn>();
|
|
}
|
|
|
|
if (Dyn.empty())
|
|
return createError("invalid empty dynamic section");
|
|
|
|
if (DynSecSize % sizeof(Elf_Dyn) != 0)
|
|
return createError("malformed dynamic section");
|
|
|
|
if (Dyn.back().d_tag != ELF::DT_NULL)
|
|
return createError("dynamic sections must be DT_NULL terminated");
|
|
|
|
return Dyn;
|
|
}
|
|
|
|
template <class ELFT>
|
|
Expected<const uint8_t *> ELFFile<ELFT>::toMappedAddr(uint64_t VAddr) const {
|
|
auto ProgramHeadersOrError = program_headers();
|
|
if (!ProgramHeadersOrError)
|
|
return ProgramHeadersOrError.takeError();
|
|
|
|
llvm::SmallVector<Elf_Phdr *, 4> LoadSegments;
|
|
|
|
for (const Elf_Phdr &Phdr : *ProgramHeadersOrError)
|
|
if (Phdr.p_type == ELF::PT_LOAD)
|
|
LoadSegments.push_back(const_cast<Elf_Phdr *>(&Phdr));
|
|
|
|
const Elf_Phdr *const *I =
|
|
std::upper_bound(LoadSegments.begin(), LoadSegments.end(), VAddr,
|
|
[](uint64_t VAddr, const Elf_Phdr_Impl<ELFT> *Phdr) {
|
|
return VAddr < Phdr->p_vaddr;
|
|
});
|
|
|
|
if (I == LoadSegments.begin())
|
|
return createError("Virtual address is not in any segment");
|
|
--I;
|
|
const Elf_Phdr &Phdr = **I;
|
|
uint64_t Delta = VAddr - Phdr.p_vaddr;
|
|
if (Delta >= Phdr.p_filesz)
|
|
return createError("Virtual address is not in any segment");
|
|
return base() + Phdr.p_offset + Delta;
|
|
}
|
|
|
|
template class llvm::object::ELFFile<ELF32LE>;
|
|
template class llvm::object::ELFFile<ELF32BE>;
|
|
template class llvm::object::ELFFile<ELF64LE>;
|
|
template class llvm::object::ELFFile<ELF64BE>;
|