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421 lines
13 KiB
C++
421 lines
13 KiB
C++
//===-- RelocVisitor.h - Visitor for object file relocations -*- C++ -*-===//
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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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//
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// This file provides a wrapper around all the different types of relocations
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// in different file formats, such that a client can handle them in a unified
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// manner by only implementing a minimal number of functions.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_OBJECT_RELOCVISITOR_H
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#define LLVM_OBJECT_RELOCVISITOR_H
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Object/COFF.h"
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#include "llvm/Object/ELFObjectFile.h"
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#include "llvm/Object/ObjectFile.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ELF.h"
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#include "llvm/Support/raw_ostream.h"
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namespace llvm {
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namespace object {
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struct RelocToApply {
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// The computed value after applying the relevant relocations.
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int64_t Value;
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// The width of the value; how many bytes to touch when applying the
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// relocation.
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char Width;
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RelocToApply(int64_t Value, char Width) : Value(Value), Width(Width) {}
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RelocToApply() : Value(0), Width(0) {}
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};
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/// @brief Base class for object file relocation visitors.
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class RelocVisitor {
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public:
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explicit RelocVisitor(const ObjectFile &Obj)
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: ObjToVisit(Obj), HasError(false) {}
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// TODO: Should handle multiple applied relocations via either passing in the
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// previously computed value or just count paired relocations as a single
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// visit.
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RelocToApply visit(uint32_t RelocType, RelocationRef R, uint64_t Value = 0) {
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if (isa<ELFObjectFileBase>(ObjToVisit))
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return visitELF(RelocType, R, Value);
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if (isa<COFFObjectFile>(ObjToVisit))
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return visitCOFF(RelocType, R, Value);
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HasError = true;
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return RelocToApply();
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}
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bool error() { return HasError; }
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private:
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const ObjectFile &ObjToVisit;
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bool HasError;
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RelocToApply visitELF(uint32_t RelocType, RelocationRef R, uint64_t Value) {
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if (ObjToVisit.getBytesInAddress() == 8) { // 64-bit object file
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switch (ObjToVisit.getArch()) {
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case Triple::x86_64:
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switch (RelocType) {
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case llvm::ELF::R_X86_64_NONE:
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return visitELF_X86_64_NONE(R);
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case llvm::ELF::R_X86_64_64:
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return visitELF_X86_64_64(R, Value);
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case llvm::ELF::R_X86_64_PC32:
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return visitELF_X86_64_PC32(R, Value);
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case llvm::ELF::R_X86_64_32:
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return visitELF_X86_64_32(R, Value);
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case llvm::ELF::R_X86_64_32S:
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return visitELF_X86_64_32S(R, Value);
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default:
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HasError = true;
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return RelocToApply();
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}
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case Triple::aarch64:
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switch (RelocType) {
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case llvm::ELF::R_AARCH64_ABS32:
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return visitELF_AARCH64_ABS32(R, Value);
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case llvm::ELF::R_AARCH64_ABS64:
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return visitELF_AARCH64_ABS64(R, Value);
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default:
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HasError = true;
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return RelocToApply();
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}
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case Triple::mips64el:
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case Triple::mips64:
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switch (RelocType) {
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case llvm::ELF::R_MIPS_32:
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return visitELF_MIPS_32(R, Value);
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case llvm::ELF::R_MIPS_64:
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return visitELF_MIPS_64(R, Value);
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default:
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HasError = true;
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return RelocToApply();
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}
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case Triple::ppc64le:
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case Triple::ppc64:
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switch (RelocType) {
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case llvm::ELF::R_PPC64_ADDR32:
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return visitELF_PPC64_ADDR32(R, Value);
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case llvm::ELF::R_PPC64_ADDR64:
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return visitELF_PPC64_ADDR64(R, Value);
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default:
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HasError = true;
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return RelocToApply();
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}
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case Triple::systemz:
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switch (RelocType) {
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case llvm::ELF::R_390_32:
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return visitELF_390_32(R, Value);
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case llvm::ELF::R_390_64:
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return visitELF_390_64(R, Value);
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default:
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HasError = true;
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return RelocToApply();
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}
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case Triple::sparcv9:
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switch (RelocType) {
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case llvm::ELF::R_SPARC_32:
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case llvm::ELF::R_SPARC_UA32:
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return visitELF_SPARCV9_32(R, Value);
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case llvm::ELF::R_SPARC_64:
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case llvm::ELF::R_SPARC_UA64:
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return visitELF_SPARCV9_64(R, Value);
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default:
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HasError = true;
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return RelocToApply();
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}
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default:
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HasError = true;
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return RelocToApply();
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}
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} else if (ObjToVisit.getBytesInAddress() == 4) { // 32-bit object file
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switch (ObjToVisit.getArch()) {
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case Triple::x86:
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switch (RelocType) {
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case llvm::ELF::R_386_NONE:
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return visitELF_386_NONE(R);
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case llvm::ELF::R_386_32:
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return visitELF_386_32(R, Value);
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case llvm::ELF::R_386_PC32:
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return visitELF_386_PC32(R, Value);
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default:
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HasError = true;
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return RelocToApply();
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}
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case Triple::ppc:
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switch (RelocType) {
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case llvm::ELF::R_PPC_ADDR32:
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return visitELF_PPC_ADDR32(R, Value);
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default:
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HasError = true;
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return RelocToApply();
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}
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case Triple::arm:
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case Triple::armeb:
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switch (RelocType) {
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default:
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HasError = true;
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return RelocToApply();
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case llvm::ELF::R_ARM_ABS32:
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return visitELF_ARM_ABS32(R, Value);
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}
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case Triple::mipsel:
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case Triple::mips:
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switch (RelocType) {
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case llvm::ELF::R_MIPS_32:
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return visitELF_MIPS_32(R, Value);
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default:
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HasError = true;
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return RelocToApply();
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}
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case Triple::sparc:
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switch (RelocType) {
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case llvm::ELF::R_SPARC_32:
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case llvm::ELF::R_SPARC_UA32:
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return visitELF_SPARC_32(R, Value);
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default:
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HasError = true;
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return RelocToApply();
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}
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default:
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HasError = true;
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return RelocToApply();
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}
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} else {
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report_fatal_error("Invalid word size in object file");
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}
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}
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RelocToApply visitCOFF(uint32_t RelocType, RelocationRef R, uint64_t Value) {
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switch (ObjToVisit.getArch()) {
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case Triple::x86:
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switch (RelocType) {
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case COFF::IMAGE_REL_I386_SECREL:
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return visitCOFF_I386_SECREL(R, Value);
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case COFF::IMAGE_REL_I386_DIR32:
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return visitCOFF_I386_DIR32(R, Value);
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}
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break;
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case Triple::x86_64:
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switch (RelocType) {
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case COFF::IMAGE_REL_AMD64_SECREL:
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return visitCOFF_AMD64_SECREL(R, Value);
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case COFF::IMAGE_REL_AMD64_ADDR64:
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return visitCOFF_AMD64_ADDR64(R, Value);
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}
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break;
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}
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HasError = true;
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return RelocToApply();
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}
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int64_t getELFAddend32LE(RelocationRef R) {
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const ELF32LEObjectFile *Obj = cast<ELF32LEObjectFile>(R.getObjectFile());
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DataRefImpl DRI = R.getRawDataRefImpl();
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int64_t Addend;
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Obj->getRelocationAddend(DRI, Addend);
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return Addend;
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}
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int64_t getELFAddend64LE(RelocationRef R) {
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const ELF64LEObjectFile *Obj = cast<ELF64LEObjectFile>(R.getObjectFile());
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DataRefImpl DRI = R.getRawDataRefImpl();
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int64_t Addend;
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Obj->getRelocationAddend(DRI, Addend);
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return Addend;
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}
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int64_t getELFAddend32BE(RelocationRef R) {
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const ELF32BEObjectFile *Obj = cast<ELF32BEObjectFile>(R.getObjectFile());
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DataRefImpl DRI = R.getRawDataRefImpl();
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int64_t Addend;
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Obj->getRelocationAddend(DRI, Addend);
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return Addend;
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}
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int64_t getELFAddend64BE(RelocationRef R) {
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const ELF64BEObjectFile *Obj = cast<ELF64BEObjectFile>(R.getObjectFile());
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DataRefImpl DRI = R.getRawDataRefImpl();
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int64_t Addend;
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Obj->getRelocationAddend(DRI, Addend);
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return Addend;
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}
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/// Operations
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/// 386-ELF
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RelocToApply visitELF_386_NONE(RelocationRef R) {
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return RelocToApply(0, 0);
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}
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// Ideally the Addend here will be the addend in the data for
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// the relocation. It's not actually the case for Rel relocations.
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RelocToApply visitELF_386_32(RelocationRef R, uint64_t Value) {
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int64_t Addend = getELFAddend32LE(R);
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return RelocToApply(Value + Addend, 4);
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}
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RelocToApply visitELF_386_PC32(RelocationRef R, uint64_t Value) {
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int64_t Addend = getELFAddend32LE(R);
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uint64_t Address;
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R.getOffset(Address);
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return RelocToApply(Value + Addend - Address, 4);
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}
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/// X86-64 ELF
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RelocToApply visitELF_X86_64_NONE(RelocationRef R) {
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return RelocToApply(0, 0);
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}
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RelocToApply visitELF_X86_64_64(RelocationRef R, uint64_t Value) {
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int64_t Addend = getELFAddend64LE(R);
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return RelocToApply(Value + Addend, 8);
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}
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RelocToApply visitELF_X86_64_PC32(RelocationRef R, uint64_t Value) {
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int64_t Addend = getELFAddend64LE(R);
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uint64_t Address;
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R.getOffset(Address);
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return RelocToApply(Value + Addend - Address, 4);
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}
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RelocToApply visitELF_X86_64_32(RelocationRef R, uint64_t Value) {
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int64_t Addend = getELFAddend64LE(R);
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uint32_t Res = (Value + Addend) & 0xFFFFFFFF;
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return RelocToApply(Res, 4);
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}
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RelocToApply visitELF_X86_64_32S(RelocationRef R, uint64_t Value) {
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int64_t Addend = getELFAddend64LE(R);
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int32_t Res = (Value + Addend) & 0xFFFFFFFF;
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return RelocToApply(Res, 4);
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}
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/// PPC64 ELF
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RelocToApply visitELF_PPC64_ADDR32(RelocationRef R, uint64_t Value) {
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int64_t Addend;
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getELFRelocationAddend(R, Addend);
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uint32_t Res = (Value + Addend) & 0xFFFFFFFF;
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return RelocToApply(Res, 4);
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}
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RelocToApply visitELF_PPC64_ADDR64(RelocationRef R, uint64_t Value) {
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int64_t Addend;
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getELFRelocationAddend(R, Addend);
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return RelocToApply(Value + Addend, 8);
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}
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/// PPC32 ELF
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RelocToApply visitELF_PPC_ADDR32(RelocationRef R, uint64_t Value) {
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int64_t Addend = getELFAddend32BE(R);
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uint32_t Res = (Value + Addend) & 0xFFFFFFFF;
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return RelocToApply(Res, 4);
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}
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/// MIPS ELF
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RelocToApply visitELF_MIPS_32(RelocationRef R, uint64_t Value) {
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int64_t Addend;
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getELFRelocationAddend(R, Addend);
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uint32_t Res = (Value + Addend) & 0xFFFFFFFF;
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return RelocToApply(Res, 4);
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}
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RelocToApply visitELF_MIPS_64(RelocationRef R, uint64_t Value) {
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int64_t Addend;
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getELFRelocationAddend(R, Addend);
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uint64_t Res = (Value + Addend);
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return RelocToApply(Res, 8);
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}
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// AArch64 ELF
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RelocToApply visitELF_AARCH64_ABS32(RelocationRef R, uint64_t Value) {
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int64_t Addend;
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getELFRelocationAddend(R, Addend);
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int64_t Res = Value + Addend;
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// Overflow check allows for both signed and unsigned interpretation.
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if (Res < INT32_MIN || Res > UINT32_MAX)
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HasError = true;
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return RelocToApply(static_cast<uint32_t>(Res), 4);
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}
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RelocToApply visitELF_AARCH64_ABS64(RelocationRef R, uint64_t Value) {
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int64_t Addend;
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getELFRelocationAddend(R, Addend);
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return RelocToApply(Value + Addend, 8);
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}
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// SystemZ ELF
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RelocToApply visitELF_390_32(RelocationRef R, uint64_t Value) {
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int64_t Addend = getELFAddend64BE(R);
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int64_t Res = Value + Addend;
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// Overflow check allows for both signed and unsigned interpretation.
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if (Res < INT32_MIN || Res > UINT32_MAX)
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HasError = true;
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return RelocToApply(static_cast<uint32_t>(Res), 4);
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}
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RelocToApply visitELF_390_64(RelocationRef R, uint64_t Value) {
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int64_t Addend = getELFAddend64BE(R);
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return RelocToApply(Value + Addend, 8);
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}
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RelocToApply visitELF_SPARC_32(RelocationRef R, uint32_t Value) {
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int32_t Addend = getELFAddend32BE(R);
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return RelocToApply(Value + Addend, 4);
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}
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RelocToApply visitELF_SPARCV9_32(RelocationRef R, uint64_t Value) {
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int32_t Addend = getELFAddend64BE(R);
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return RelocToApply(Value + Addend, 4);
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}
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RelocToApply visitELF_SPARCV9_64(RelocationRef R, uint64_t Value) {
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int64_t Addend = getELFAddend64BE(R);
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return RelocToApply(Value + Addend, 8);
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}
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RelocToApply visitELF_ARM_ABS32(RelocationRef R, uint64_t Value) {
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int64_t Addend;
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getELFRelocationAddend(R, Addend);
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int64_t Res = Value + Addend;
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// Overflow check allows for both signed and unsigned interpretation.
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if (Res < INT32_MIN || Res > UINT32_MAX)
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HasError = true;
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return RelocToApply(static_cast<uint32_t>(Res), 4);
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}
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/// I386 COFF
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RelocToApply visitCOFF_I386_SECREL(RelocationRef R, uint64_t Value) {
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return RelocToApply(static_cast<uint32_t>(Value), /*Width=*/4);
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}
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RelocToApply visitCOFF_I386_DIR32(RelocationRef R, uint64_t Value) {
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return RelocToApply(static_cast<uint32_t>(Value), /*Width=*/4);
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}
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/// AMD64 COFF
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RelocToApply visitCOFF_AMD64_SECREL(RelocationRef R, uint64_t Value) {
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return RelocToApply(static_cast<uint32_t>(Value), /*Width=*/4);
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}
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RelocToApply visitCOFF_AMD64_ADDR64(RelocationRef R, uint64_t Value) {
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return RelocToApply(Value, /*Width=*/8);
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}
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};
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}
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}
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#endif
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