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894f742acb
When compiling position-independent executables, we now use DW_EH_PE_pcrel | DW_EH_PE_sdata4. However, the MIPS ABI does not define a 64-bit PC-relative ELF relocation so we cannot use sdata8 for the large code model case. When using the large code model, we fall back to the previous behaviour of generating absolute relocations. With this change clang-generated .o files can be linked by LLD without having to pass -Wl,-z,notext (which creates text relocations). This is simpler than the approach used by ld.bfd, which rewrites the .eh_frame section to convert absolute relocations into relative references. I saw in D13104 that apparently ld.bfd did not accept pc-relative relocations for MIPS ouput at some point. However, I also checked that recent ld.bfd can process the clang-generated .o files so this no longer seems true. Reviewed By: atanasyan Differential Revision: https://reviews.llvm.org/D72228
616 lines
15 KiB
C++
616 lines
15 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_PC64:
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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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case ELF::R_X86_64_PC64:
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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 + A) & 0xFFFFFFFF;
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case ELF::R_BPF_64_64:
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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 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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case ELF::R_MIPS_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 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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case ELF::R_MIPS_PC32:
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return S + getELFAddend(R) - R.getOffset();
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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 supportsRISCV(uint64_t Type) {
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switch (Type) {
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case ELF::R_RISCV_NONE:
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case ELF::R_RISCV_32:
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case ELF::R_RISCV_32_PCREL:
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case ELF::R_RISCV_64:
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case ELF::R_RISCV_SET6:
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case ELF::R_RISCV_SUB6:
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case ELF::R_RISCV_ADD8:
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case ELF::R_RISCV_SUB8:
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case ELF::R_RISCV_ADD16:
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case ELF::R_RISCV_SUB16:
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case ELF::R_RISCV_ADD32:
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case ELF::R_RISCV_SUB32:
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case ELF::R_RISCV_ADD64:
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case ELF::R_RISCV_SUB64:
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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 resolveRISCV(RelocationRef R, uint64_t S, uint64_t A) {
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int64_t RA = getELFAddend(R);
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switch (R.getType()) {
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case ELF::R_RISCV_NONE:
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return A;
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case ELF::R_RISCV_32:
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return (S + RA) & 0xFFFFFFFF;
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case ELF::R_RISCV_32_PCREL:
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return (S + RA - R.getOffset()) & 0xFFFFFFFF;
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case ELF::R_RISCV_64:
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return S + RA;
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case ELF::R_RISCV_SET6:
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return (A & 0xC0) | ((S + RA) & 0x3F);
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case ELF::R_RISCV_SUB6:
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return (A & 0xC0) | (((A & 0x3F) - (S + RA)) & 0x3F);
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case ELF::R_RISCV_ADD8:
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return (A + (S + RA)) & 0xFF;
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case ELF::R_RISCV_SUB8:
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return (A - (S + RA)) & 0xFF;
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case ELF::R_RISCV_ADD16:
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return (A + (S + RA)) & 0xFFFF;
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case ELF::R_RISCV_SUB16:
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return (A - (S + RA)) & 0xFFFF;
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case ELF::R_RISCV_ADD32:
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return (A + (S + RA)) & 0xFFFFFFFF;
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case ELF::R_RISCV_SUB32:
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return (A - (S + RA)) & 0xFFFFFFFF;
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case ELF::R_RISCV_ADD64:
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return (A + (S + RA));
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case ELF::R_RISCV_SUB64:
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return (A - (S + RA));
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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(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 supportsCOFFARM(uint64_t Type) {
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switch (Type) {
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case COFF::IMAGE_REL_ARM_SECREL:
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case COFF::IMAGE_REL_ARM_ADDR32:
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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 resolveCOFFARM(RelocationRef R, uint64_t S, uint64_t A) {
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switch (R.getType()) {
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case COFF::IMAGE_REL_ARM_SECREL:
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case COFF::IMAGE_REL_ARM_ADDR32:
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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 supportsCOFFARM64(uint64_t Type) {
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switch (Type) {
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case COFF::IMAGE_REL_ARM64_SECREL:
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case COFF::IMAGE_REL_ARM64_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 resolveCOFFARM64(RelocationRef R, uint64_t S, uint64_t A) {
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switch (R.getType()) {
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case COFF::IMAGE_REL_ARM64_SECREL:
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return (S + A) & 0xFFFFFFFF;
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case COFF::IMAGE_REL_ARM64_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");
|
|
}
|
|
|
|
static bool supportsWasm32(uint64_t Type) {
|
|
switch (Type) {
|
|
case wasm::R_WASM_FUNCTION_INDEX_LEB:
|
|
case wasm::R_WASM_TABLE_INDEX_SLEB:
|
|
case wasm::R_WASM_TABLE_INDEX_I32:
|
|
case wasm::R_WASM_MEMORY_ADDR_LEB:
|
|
case wasm::R_WASM_MEMORY_ADDR_SLEB:
|
|
case wasm::R_WASM_MEMORY_ADDR_I32:
|
|
case wasm::R_WASM_TYPE_INDEX_LEB:
|
|
case wasm::R_WASM_GLOBAL_INDEX_LEB:
|
|
case wasm::R_WASM_FUNCTION_OFFSET_I32:
|
|
case wasm::R_WASM_SECTION_OFFSET_I32:
|
|
case wasm::R_WASM_EVENT_INDEX_LEB:
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static uint64_t resolveWasm32(RelocationRef R, uint64_t S, uint64_t A) {
|
|
switch (R.getType()) {
|
|
case wasm::R_WASM_FUNCTION_INDEX_LEB:
|
|
case wasm::R_WASM_TABLE_INDEX_SLEB:
|
|
case wasm::R_WASM_TABLE_INDEX_I32:
|
|
case wasm::R_WASM_MEMORY_ADDR_LEB:
|
|
case wasm::R_WASM_MEMORY_ADDR_SLEB:
|
|
case wasm::R_WASM_MEMORY_ADDR_I32:
|
|
case wasm::R_WASM_TYPE_INDEX_LEB:
|
|
case wasm::R_WASM_GLOBAL_INDEX_LEB:
|
|
case wasm::R_WASM_FUNCTION_OFFSET_I32:
|
|
case wasm::R_WASM_SECTION_OFFSET_I32:
|
|
case wasm::R_WASM_EVENT_INDEX_LEB:
|
|
// For wasm section, its offset at 0 -- ignoring Value
|
|
return A;
|
|
default:
|
|
llvm_unreachable("Invalid relocation type");
|
|
}
|
|
}
|
|
|
|
std::pair<bool (*)(uint64_t), RelocationResolver>
|
|
getRelocationResolver(const ObjectFile &Obj) {
|
|
if (Obj.isCOFF()) {
|
|
switch (Obj.getArch()) {
|
|
case Triple::x86_64:
|
|
return {supportsCOFFX86_64, resolveCOFFX86_64};
|
|
case Triple::x86:
|
|
return {supportsCOFFX86, resolveCOFFX86};
|
|
case Triple::arm:
|
|
case Triple::thumb:
|
|
return {supportsCOFFARM, resolveCOFFARM};
|
|
case Triple::aarch64:
|
|
return {supportsCOFFARM64, resolveCOFFARM64};
|
|
default:
|
|
return {nullptr, nullptr};
|
|
}
|
|
} else if (Obj.isELF()) {
|
|
if (Obj.getBytesInAddress() == 8) {
|
|
switch (Obj.getArch()) {
|
|
case Triple::x86_64:
|
|
return {supportsX86_64, resolveX86_64};
|
|
case Triple::aarch64:
|
|
case Triple::aarch64_be:
|
|
return {supportsAArch64, resolveAArch64};
|
|
case Triple::bpfel:
|
|
case Triple::bpfeb:
|
|
return {supportsBPF, resolveBPF};
|
|
case Triple::mips64el:
|
|
case Triple::mips64:
|
|
return {supportsMips64, resolveMips64};
|
|
case Triple::ppc64le:
|
|
case Triple::ppc64:
|
|
return {supportsPPC64, resolvePPC64};
|
|
case Triple::systemz:
|
|
return {supportsSystemZ, resolveSystemZ};
|
|
case Triple::sparcv9:
|
|
return {supportsSparc64, resolveSparc64};
|
|
case Triple::amdgcn:
|
|
return {supportsAmdgpu, resolveAmdgpu};
|
|
case Triple::riscv64:
|
|
return {supportsRISCV, resolveRISCV};
|
|
default:
|
|
return {nullptr, nullptr};
|
|
}
|
|
}
|
|
|
|
// 32-bit object file
|
|
assert(Obj.getBytesInAddress() == 4 &&
|
|
"Invalid word size in object file");
|
|
|
|
switch (Obj.getArch()) {
|
|
case Triple::x86:
|
|
return {supportsX86, resolveX86};
|
|
case Triple::ppc:
|
|
return {supportsPPC32, resolvePPC32};
|
|
case Triple::arm:
|
|
case Triple::armeb:
|
|
return {supportsARM, resolveARM};
|
|
case Triple::avr:
|
|
return {supportsAVR, resolveAVR};
|
|
case Triple::lanai:
|
|
return {supportsLanai, resolveLanai};
|
|
case Triple::mipsel:
|
|
case Triple::mips:
|
|
return {supportsMips32, resolveMips32};
|
|
case Triple::sparc:
|
|
return {supportsSparc32, resolveSparc32};
|
|
case Triple::hexagon:
|
|
return {supportsHexagon, resolveHexagon};
|
|
case Triple::riscv32:
|
|
return {supportsRISCV, resolveRISCV};
|
|
default:
|
|
return {nullptr, nullptr};
|
|
}
|
|
} else if (Obj.isMachO()) {
|
|
if (Obj.getArch() == Triple::x86_64)
|
|
return {supportsMachOX86_64, resolveMachOX86_64};
|
|
return {nullptr, nullptr};
|
|
} else if (Obj.isWasm()) {
|
|
if (Obj.getArch() == Triple::wasm32)
|
|
return {supportsWasm32, resolveWasm32};
|
|
return {nullptr, nullptr};
|
|
}
|
|
|
|
llvm_unreachable("Invalid object file");
|
|
}
|
|
|
|
} // namespace object
|
|
} // namespace llvm
|