498 lines
12 KiB
C++
498 lines
12 KiB
C++
//===- RelocationResolver.cpp ------------------------------------*- 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 defines utilities to resolve relocations in object files.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Object/RelocationResolver.h"
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namespace llvm {
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namespace object {
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static int64_t getELFAddend(RelocationRef R) {
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Expected<int64_t> AddendOrErr = ELFRelocationRef(R).getAddend();
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handleAllErrors(AddendOrErr.takeError(), [](const ErrorInfoBase &EI) {
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report_fatal_error(EI.message());
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});
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return *AddendOrErr;
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}
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static bool supportsX86_64(uint64_t Type) {
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switch (Type) {
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case ELF::R_X86_64_NONE:
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case ELF::R_X86_64_64:
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case ELF::R_X86_64_DTPOFF32:
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case ELF::R_X86_64_DTPOFF64:
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case ELF::R_X86_64_PC32:
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case ELF::R_X86_64_32:
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case ELF::R_X86_64_32S:
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return true;
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default:
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return false;
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}
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}
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static uint64_t resolveX86_64(RelocationRef R, uint64_t S, uint64_t A) {
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switch (R.getType()) {
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case ELF::R_X86_64_NONE:
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return A;
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case ELF::R_X86_64_64:
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case ELF::R_X86_64_DTPOFF32:
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case ELF::R_X86_64_DTPOFF64:
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return S + getELFAddend(R);
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case ELF::R_X86_64_PC32:
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return S + getELFAddend(R) - R.getOffset();
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case ELF::R_X86_64_32:
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case ELF::R_X86_64_32S:
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return (S + getELFAddend(R)) & 0xFFFFFFFF;
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default:
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llvm_unreachable("Invalid relocation type");
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}
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}
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static bool supportsAArch64(uint64_t Type) {
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switch (Type) {
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case ELF::R_AARCH64_ABS32:
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case ELF::R_AARCH64_ABS64:
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return true;
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default:
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return false;
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}
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}
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static uint64_t resolveAArch64(RelocationRef R, uint64_t S, uint64_t A) {
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switch (R.getType()) {
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case ELF::R_AARCH64_ABS32:
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return (S + getELFAddend(R)) & 0xFFFFFFFF;
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case ELF::R_AARCH64_ABS64:
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return S + getELFAddend(R);
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default:
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llvm_unreachable("Invalid relocation type");
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}
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}
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static bool supportsBPF(uint64_t Type) {
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switch (Type) {
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case ELF::R_BPF_64_32:
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case ELF::R_BPF_64_64:
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return true;
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default:
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return false;
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}
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}
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static uint64_t resolveBPF(RelocationRef R, uint64_t S, uint64_t A) {
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switch (R.getType()) {
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case ELF::R_BPF_64_32:
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return S & 0xFFFFFFFF;
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case ELF::R_BPF_64_64:
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return S;
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default:
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llvm_unreachable("Invalid relocation type");
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}
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}
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static bool supportsMips64(uint64_t Type) {
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switch (Type) {
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case ELF::R_MIPS_32:
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case ELF::R_MIPS_64:
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case ELF::R_MIPS_TLS_DTPREL64:
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return true;
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default:
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return false;
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}
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}
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static uint64_t resolveMips64(RelocationRef R, uint64_t S, uint64_t A) {
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switch (R.getType()) {
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case ELF::R_MIPS_32:
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return (S + getELFAddend(R)) & 0xFFFFFFFF;
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case ELF::R_MIPS_64:
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return S + getELFAddend(R);
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case ELF::R_MIPS_TLS_DTPREL64:
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return S + getELFAddend(R) - 0x8000;
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default:
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llvm_unreachable("Invalid relocation type");
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}
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}
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static bool supportsPPC64(uint64_t Type) {
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switch (Type) {
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case ELF::R_PPC64_ADDR32:
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case ELF::R_PPC64_ADDR64:
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return true;
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default:
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return false;
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}
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}
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static uint64_t resolvePPC64(RelocationRef R, uint64_t S, uint64_t A) {
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switch (R.getType()) {
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case ELF::R_PPC64_ADDR32:
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return (S + getELFAddend(R)) & 0xFFFFFFFF;
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case ELF::R_PPC64_ADDR64:
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return S + getELFAddend(R);
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default:
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llvm_unreachable("Invalid relocation type");
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}
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}
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static bool supportsSystemZ(uint64_t Type) {
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switch (Type) {
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case ELF::R_390_32:
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case ELF::R_390_64:
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return true;
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default:
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return false;
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}
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}
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static uint64_t resolveSystemZ(RelocationRef R, uint64_t S, uint64_t A) {
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switch (R.getType()) {
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case ELF::R_390_32:
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return (S + getELFAddend(R)) & 0xFFFFFFFF;
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case ELF::R_390_64:
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return S + getELFAddend(R);
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default:
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llvm_unreachable("Invalid relocation type");
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}
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}
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static bool supportsSparc64(uint64_t Type) {
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switch (Type) {
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case ELF::R_SPARC_32:
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case ELF::R_SPARC_64:
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case ELF::R_SPARC_UA32:
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case ELF::R_SPARC_UA64:
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return true;
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default:
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return false;
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}
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}
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static uint64_t resolveSparc64(RelocationRef R, uint64_t S, uint64_t A) {
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switch (R.getType()) {
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case ELF::R_SPARC_32:
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case ELF::R_SPARC_64:
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case ELF::R_SPARC_UA32:
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case ELF::R_SPARC_UA64:
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return S + getELFAddend(R);
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default:
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llvm_unreachable("Invalid relocation type");
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}
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}
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static bool supportsAmdgpu(uint64_t Type) {
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switch (Type) {
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case ELF::R_AMDGPU_ABS32:
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case ELF::R_AMDGPU_ABS64:
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return true;
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default:
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return false;
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}
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}
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static uint64_t resolveAmdgpu(RelocationRef R, uint64_t S, uint64_t A) {
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switch (R.getType()) {
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case ELF::R_AMDGPU_ABS32:
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case ELF::R_AMDGPU_ABS64:
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return S + getELFAddend(R);
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default:
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llvm_unreachable("Invalid relocation type");
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}
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}
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static bool supportsX86(uint64_t Type) {
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switch (Type) {
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case ELF::R_386_NONE:
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case ELF::R_386_32:
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case ELF::R_386_PC32:
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return true;
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default:
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return false;
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}
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}
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static uint64_t resolveX86(RelocationRef R, uint64_t S, uint64_t A) {
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switch (R.getType()) {
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case ELF::R_386_NONE:
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return A;
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case ELF::R_386_32:
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return S + A;
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case ELF::R_386_PC32:
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return S - R.getOffset() + A;
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default:
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llvm_unreachable("Invalid relocation type");
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}
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}
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static bool supportsPPC32(uint64_t Type) {
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return Type == ELF::R_PPC_ADDR32;
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}
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static uint64_t resolvePPC32(RelocationRef R, uint64_t S, uint64_t A) {
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if (R.getType() == ELF::R_PPC_ADDR32)
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return (S + getELFAddend(R)) & 0xFFFFFFFF;
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llvm_unreachable("Invalid relocation type");
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}
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static bool supportsARM(uint64_t Type) {
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return Type == ELF::R_ARM_ABS32;
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}
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static uint64_t resolveARM(RelocationRef R, uint64_t S, uint64_t A) {
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if (R.getType() == ELF::R_ARM_ABS32)
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return (S + A) & 0xFFFFFFFF;
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llvm_unreachable("Invalid relocation type");
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}
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static bool supportsAVR(uint64_t Type) {
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switch (Type) {
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case ELF::R_AVR_16:
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case ELF::R_AVR_32:
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return true;
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default:
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return false;
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}
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}
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static uint64_t resolveAVR(RelocationRef R, uint64_t S, uint64_t A) {
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switch (R.getType()) {
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case ELF::R_AVR_16:
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return (S + getELFAddend(R)) & 0xFFFF;
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case ELF::R_AVR_32:
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return (S + getELFAddend(R)) & 0xFFFFFFFF;
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default:
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llvm_unreachable("Invalid relocation type");
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}
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}
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static bool supportsLanai(uint64_t Type) {
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return Type == ELF::R_LANAI_32;
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}
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static uint64_t resolveLanai(RelocationRef R, uint64_t S, uint64_t A) {
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if (R.getType() == ELF::R_LANAI_32)
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return (S + getELFAddend(R)) & 0xFFFFFFFF;
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llvm_unreachable("Invalid relocation type");
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}
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static bool supportsMips32(uint64_t Type) {
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switch (Type) {
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case ELF::R_MIPS_32:
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case ELF::R_MIPS_TLS_DTPREL32:
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return true;
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default:
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return false;
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}
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}
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static uint64_t resolveMips32(RelocationRef R, uint64_t S, uint64_t A) {
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// FIXME: Take in account implicit addends to get correct results.
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uint32_t Rel = R.getType();
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if (Rel == ELF::R_MIPS_32)
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return (S + A) & 0xFFFFFFFF;
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if (Rel == ELF::R_MIPS_TLS_DTPREL32)
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return (S + A) & 0xFFFFFFFF;
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llvm_unreachable("Invalid relocation type");
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}
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static bool supportsSparc32(uint64_t Type) {
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switch (Type) {
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case ELF::R_SPARC_32:
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case ELF::R_SPARC_UA32:
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return true;
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default:
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return false;
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}
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}
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static uint64_t resolveSparc32(RelocationRef R, uint64_t S, uint64_t A) {
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uint32_t Rel = R.getType();
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if (Rel == ELF::R_SPARC_32 || Rel == ELF::R_SPARC_UA32)
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return S + getELFAddend(R);
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return A;
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}
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static bool supportsHexagon(uint64_t Type) {
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return Type == ELF::R_HEX_32;
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}
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static uint64_t resolveHexagon(RelocationRef R, uint64_t S, uint64_t A) {
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if (R.getType() == ELF::R_HEX_32)
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return S + getELFAddend(R);
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llvm_unreachable("Invalid relocation type");
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}
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static bool supportsCOFFX86(uint64_t Type) {
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switch (Type) {
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case COFF::IMAGE_REL_I386_SECREL:
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case COFF::IMAGE_REL_I386_DIR32:
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return true;
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default:
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return false;
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}
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}
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static uint64_t resolveCOFFX86(RelocationRef R, uint64_t S, uint64_t A) {
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switch (R.getType()) {
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case COFF::IMAGE_REL_I386_SECREL:
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case COFF::IMAGE_REL_I386_DIR32:
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return (S + A) & 0xFFFFFFFF;
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default:
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llvm_unreachable("Invalid relocation type");
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}
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}
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static bool supportsCOFFX86_64(uint64_t Type) {
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switch (Type) {
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case COFF::IMAGE_REL_AMD64_SECREL:
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case COFF::IMAGE_REL_AMD64_ADDR64:
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return true;
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default:
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return false;
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}
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}
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static uint64_t resolveCOFFX86_64(RelocationRef R, uint64_t S, uint64_t A) {
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switch (R.getType()) {
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case COFF::IMAGE_REL_AMD64_SECREL:
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return (S + A) & 0xFFFFFFFF;
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case COFF::IMAGE_REL_AMD64_ADDR64:
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return S + A;
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default:
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llvm_unreachable("Invalid relocation type");
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}
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}
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static bool supportsMachOX86_64(uint64_t Type) {
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return Type == MachO::X86_64_RELOC_UNSIGNED;
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}
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static uint64_t resolveMachOX86_64(RelocationRef R, uint64_t S, uint64_t A) {
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if (R.getType() == MachO::X86_64_RELOC_UNSIGNED)
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return S;
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llvm_unreachable("Invalid relocation type");
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}
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static bool supportsWasm32(uint64_t Type) {
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switch (Type) {
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case wasm::R_WASM_FUNCTION_INDEX_LEB:
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case wasm::R_WASM_TABLE_INDEX_SLEB:
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case wasm::R_WASM_TABLE_INDEX_I32:
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case wasm::R_WASM_MEMORY_ADDR_LEB:
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case wasm::R_WASM_MEMORY_ADDR_SLEB:
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case wasm::R_WASM_MEMORY_ADDR_I32:
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case wasm::R_WASM_TYPE_INDEX_LEB:
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case wasm::R_WASM_GLOBAL_INDEX_LEB:
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case wasm::R_WASM_FUNCTION_OFFSET_I32:
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case wasm::R_WASM_SECTION_OFFSET_I32:
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case wasm::R_WASM_EVENT_INDEX_LEB:
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return true;
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default:
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return false;
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}
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}
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static uint64_t resolveWasm32(RelocationRef R, uint64_t S, uint64_t A) {
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switch (R.getType()) {
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case wasm::R_WASM_FUNCTION_INDEX_LEB:
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case wasm::R_WASM_TABLE_INDEX_SLEB:
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case wasm::R_WASM_TABLE_INDEX_I32:
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case wasm::R_WASM_MEMORY_ADDR_LEB:
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case wasm::R_WASM_MEMORY_ADDR_SLEB:
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case wasm::R_WASM_MEMORY_ADDR_I32:
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case wasm::R_WASM_TYPE_INDEX_LEB:
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case wasm::R_WASM_GLOBAL_INDEX_LEB:
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case wasm::R_WASM_FUNCTION_OFFSET_I32:
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case wasm::R_WASM_SECTION_OFFSET_I32:
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case wasm::R_WASM_EVENT_INDEX_LEB:
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// For wasm section, its offset at 0 -- ignoring Value
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return A;
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default:
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llvm_unreachable("Invalid relocation type");
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}
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}
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std::pair<bool (*)(uint64_t), RelocationResolver>
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getRelocationResolver(const ObjectFile &Obj) {
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if (Obj.isCOFF()) {
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if (Obj.getBytesInAddress() == 8)
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return {supportsCOFFX86_64, resolveCOFFX86_64};
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return {supportsCOFFX86, resolveCOFFX86};
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} else if (Obj.isELF()) {
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if (Obj.getBytesInAddress() == 8) {
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switch (Obj.getArch()) {
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case Triple::x86_64:
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return {supportsX86_64, resolveX86_64};
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case Triple::aarch64:
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case Triple::aarch64_be:
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return {supportsAArch64, resolveAArch64};
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case Triple::bpfel:
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case Triple::bpfeb:
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return {supportsBPF, resolveBPF};
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case Triple::mips64el:
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case Triple::mips64:
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return {supportsMips64, resolveMips64};
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case Triple::ppc64le:
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case Triple::ppc64:
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return {supportsPPC64, resolvePPC64};
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case Triple::systemz:
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return {supportsSystemZ, resolveSystemZ};
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case Triple::sparcv9:
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return {supportsSparc64, resolveSparc64};
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case Triple::amdgcn:
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return {supportsAmdgpu, resolveAmdgpu};
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default:
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return {nullptr, nullptr};
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}
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}
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// 32-bit object file
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assert(Obj.getBytesInAddress() == 4 &&
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"Invalid word size in object file");
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switch (Obj.getArch()) {
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case Triple::x86:
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return {supportsX86, resolveX86};
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case Triple::ppc:
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return {supportsPPC32, resolvePPC32};
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case Triple::arm:
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case Triple::armeb:
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return {supportsARM, resolveARM};
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case Triple::avr:
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return {supportsAVR, resolveAVR};
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case Triple::lanai:
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return {supportsLanai, resolveLanai};
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case Triple::mipsel:
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case Triple::mips:
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return {supportsMips32, resolveMips32};
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case Triple::sparc:
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return {supportsSparc32, resolveSparc32};
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case Triple::hexagon:
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return {supportsHexagon, resolveHexagon};
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default:
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return {nullptr, nullptr};
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}
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} else if (Obj.isMachO()) {
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if (Obj.getArch() == Triple::x86_64)
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return {supportsMachOX86_64, resolveMachOX86_64};
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return {nullptr, nullptr};
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} else if (Obj.isWasm()) {
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if (Obj.getArch() == Triple::wasm32)
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return {supportsWasm32, resolveWasm32};
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return {nullptr, nullptr};
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}
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llvm_unreachable("Invalid object file");
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}
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} // namespace object
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} // namespace llvm
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