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This patch replaces RuntimeDyld::SymbolInfo with JITSymbol: A symbol class that is capable of lazy materialization (i.e. the symbol definition needn't be emitted until the address is requested). This can be used to support common and weak symbols in the JIT (though this is not implemented in this patch). For consistency, RuntimeDyld::SymbolResolver is renamed to JITSymbolResolver. For space efficiency a new class, JITEvaluatedSymbol, is introduced that behaves like the old RuntimeDyld::SymbolInfo - i.e. it is just a pair of an address and symbol flags. Instances of JITEvaluatedSymbol can be used in symbol-tables to avoid paying the space cost of the materializer. llvm-svn: 277386
292 lines
11 KiB
C++
292 lines
11 KiB
C++
//===--- RuntimeDyldCOFFThumb.h --- COFF/Thumb specific code ---*- 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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// COFF thumb support for MC-JIT runtime dynamic linker.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_TARGETS_RUNTIMEDYLDCOFFTHUMB_H
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#define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_TARGETS_RUNTIMEDYLDCOFFTHUMB_H
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#include "llvm/Object/COFF.h"
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#include "llvm/Support/COFF.h"
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#include "../RuntimeDyldCOFF.h"
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#define DEBUG_TYPE "dyld"
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namespace llvm {
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class RuntimeDyldCOFFThumb : public RuntimeDyldCOFF {
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public:
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RuntimeDyldCOFFThumb(RuntimeDyld::MemoryManager &MM,
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JITSymbolResolver &Resolver)
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: RuntimeDyldCOFF(MM, Resolver) {}
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unsigned getMaxStubSize() override {
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return 16; // 8-byte load instructions, 4-byte jump, 4-byte padding
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}
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unsigned getStubAlignment() override { return 1; }
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Expected<relocation_iterator>
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processRelocationRef(unsigned SectionID,
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relocation_iterator RelI,
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const ObjectFile &Obj,
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ObjSectionToIDMap &ObjSectionToID,
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StubMap &Stubs) override {
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auto Symbol = RelI->getSymbol();
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if (Symbol == Obj.symbol_end())
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report_fatal_error("Unknown symbol in relocation");
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Expected<StringRef> TargetNameOrErr = Symbol->getName();
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if (!TargetNameOrErr)
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return TargetNameOrErr.takeError();
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StringRef TargetName = *TargetNameOrErr;
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auto SectionOrErr = Symbol->getSection();
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if (!SectionOrErr)
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return SectionOrErr.takeError();
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auto Section = *SectionOrErr;
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uint64_t RelType = RelI->getType();
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uint64_t Offset = RelI->getOffset();
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// Determine the Addend used to adjust the relocation value.
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uint64_t Addend = 0;
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SectionEntry &AddendSection = Sections[SectionID];
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uintptr_t ObjTarget = AddendSection.getObjAddress() + Offset;
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uint8_t *Displacement = (uint8_t *)ObjTarget;
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switch (RelType) {
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case COFF::IMAGE_REL_ARM_ADDR32:
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case COFF::IMAGE_REL_ARM_ADDR32NB:
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case COFF::IMAGE_REL_ARM_SECREL:
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Addend = readBytesUnaligned(Displacement, 4);
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break;
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default:
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break;
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}
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#if !defined(NDEBUG)
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SmallString<32> RelTypeName;
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RelI->getTypeName(RelTypeName);
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#endif
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DEBUG(dbgs() << "\t\tIn Section " << SectionID << " Offset " << Offset
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<< " RelType: " << RelTypeName << " TargetName: " << TargetName
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<< " Addend " << Addend << "\n");
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unsigned TargetSectionID = -1;
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if (Section == Obj.section_end()) {
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RelocationEntry RE(SectionID, Offset, RelType, 0, -1, 0, 0, 0, false, 0);
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addRelocationForSymbol(RE, TargetName);
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} else {
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if (auto TargetSectionIDOrErr =
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findOrEmitSection(Obj, *Section, Section->isText(), ObjSectionToID))
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TargetSectionID = *TargetSectionIDOrErr;
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else
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return TargetSectionIDOrErr.takeError();
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switch (RelType) {
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default: llvm_unreachable("unsupported relocation type");
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case COFF::IMAGE_REL_ARM_ABSOLUTE:
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// This relocation is ignored.
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break;
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case COFF::IMAGE_REL_ARM_ADDR32:
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case COFF::IMAGE_REL_ARM_ADDR32NB: {
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RelocationEntry RE =
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RelocationEntry(SectionID, Offset, RelType, Addend, TargetSectionID,
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getSymbolOffset(*Symbol), 0, 0, false, 0);
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addRelocationForSection(RE, TargetSectionID);
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break;
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}
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case COFF::IMAGE_REL_ARM_SECTION: {
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RelocationEntry RE =
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RelocationEntry(TargetSectionID, Offset, RelType, 0);
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addRelocationForSection(RE, TargetSectionID);
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break;
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}
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case COFF::IMAGE_REL_ARM_SECREL: {
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RelocationEntry RE = RelocationEntry(SectionID, Offset, RelType,
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getSymbolOffset(*Symbol) + Addend);
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addRelocationForSection(RE, TargetSectionID);
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break;
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}
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case COFF::IMAGE_REL_ARM_MOV32T: {
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RelocationEntry RE =
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RelocationEntry(SectionID, Offset, RelType, Addend, TargetSectionID,
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getSymbolOffset(*Symbol), 0, 0, false, 0);
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addRelocationForSection(RE, TargetSectionID);
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break;
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}
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case COFF::IMAGE_REL_ARM_BRANCH20T:
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case COFF::IMAGE_REL_ARM_BRANCH24T:
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case COFF::IMAGE_REL_ARM_BLX23T: {
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RelocationEntry RE =
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RelocationEntry(SectionID, Offset, RelType,
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getSymbolOffset(*Symbol) + Addend, true, 0);
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addRelocationForSection(RE, TargetSectionID);
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break;
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}
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}
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}
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return ++RelI;
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}
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void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override {
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const auto Section = Sections[RE.SectionID];
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uint8_t *Target = Section.getAddressWithOffset(RE.Offset);
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switch (RE.RelType) {
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default: llvm_unreachable("unsupported relocation type");
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case COFF::IMAGE_REL_ARM_ABSOLUTE:
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// This relocation is ignored.
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break;
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case COFF::IMAGE_REL_ARM_ADDR32: {
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// The target's 32-bit VA.
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uint64_t Result =
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RE.Sections.SectionA == static_cast<uint32_t>(-1)
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? Value
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: Sections[RE.Sections.SectionA].getLoadAddressWithOffset(RE.Addend);
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assert(static_cast<int32_t>(Result) <= INT32_MAX &&
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"relocation overflow");
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assert(static_cast<int32_t>(Result) >= INT32_MIN &&
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"relocation underflow");
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DEBUG(dbgs() << "\t\tOffset: " << RE.Offset
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<< " RelType: IMAGE_REL_ARM_ADDR32"
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<< " TargetSection: " << RE.Sections.SectionA
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<< " Value: " << format("0x%08" PRIx32, Result) << '\n');
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writeBytesUnaligned(Result, Target, 4);
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break;
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}
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case COFF::IMAGE_REL_ARM_ADDR32NB: {
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// The target's 32-bit RVA.
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// NOTE: use Section[0].getLoadAddress() as an approximation of ImageBase
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uint64_t Result = Sections[RE.Sections.SectionA].getLoadAddress() -
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Sections[0].getLoadAddress() + RE.Addend;
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assert(static_cast<int32_t>(Result) <= INT32_MAX &&
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"relocation overflow");
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assert(static_cast<int32_t>(Result) >= INT32_MIN &&
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"relocation underflow");
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DEBUG(dbgs() << "\t\tOffset: " << RE.Offset
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<< " RelType: IMAGE_REL_ARM_ADDR32NB"
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<< " TargetSection: " << RE.Sections.SectionA
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<< " Value: " << format("0x%08" PRIx32, Result) << '\n');
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writeBytesUnaligned(Result, Target, 4);
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break;
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}
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case COFF::IMAGE_REL_ARM_SECTION:
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// 16-bit section index of the section that contains the target.
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assert(static_cast<int32_t>(RE.SectionID) <= INT16_MAX &&
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"relocation overflow");
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assert(static_cast<int32_t>(RE.SectionID) >= INT16_MIN &&
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"relocation underflow");
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DEBUG(dbgs() << "\t\tOffset: " << RE.Offset
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<< " RelType: IMAGE_REL_ARM_SECTION Value: " << RE.SectionID
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<< '\n');
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writeBytesUnaligned(RE.SectionID, Target, 2);
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break;
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case COFF::IMAGE_REL_ARM_SECREL:
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// 32-bit offset of the target from the beginning of its section.
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assert(static_cast<int32_t>(RE.Addend) <= INT32_MAX &&
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"relocation overflow");
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assert(static_cast<int32_t>(RE.Addend) >= INT32_MIN &&
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"relocation underflow");
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DEBUG(dbgs() << "\t\tOffset: " << RE.Offset
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<< " RelType: IMAGE_REL_ARM_SECREL Value: " << RE.Addend
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<< '\n');
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writeBytesUnaligned(RE.Addend, Target, 2);
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break;
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case COFF::IMAGE_REL_ARM_MOV32T: {
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// 32-bit VA of the target applied to a contiguous MOVW+MOVT pair.
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uint64_t Result =
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Sections[RE.Sections.SectionA].getLoadAddressWithOffset(RE.Addend);
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assert(static_cast<int32_t>(Result) <= INT32_MAX &&
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"relocation overflow");
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assert(static_cast<int32_t>(Result) >= INT32_MIN &&
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"relocation underflow");
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DEBUG(dbgs() << "\t\tOffset: " << RE.Offset
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<< " RelType: IMAGE_REL_ARM_MOV32T"
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<< " TargetSection: " << RE.Sections.SectionA
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<< " Value: " << format("0x%08" PRIx32, Result) << '\n');
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// MOVW(T3): |11110|i|10|0|1|0|0|imm4|0|imm3|Rd|imm8|
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// imm32 = zext imm4:i:imm3:imm8
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// MOVT(T1): |11110|i|10|1|1|0|0|imm4|0|imm3|Rd|imm8|
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// imm16 = imm4:i:imm3:imm8
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auto EncodeImmediate = [](uint8_t *Bytes, uint16_t Immediate) {
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Bytes[0] |= ((Immediate & 0xf000) >> 12);
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Bytes[1] |= ((Immediate & 0x0800) >> 11);
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Bytes[2] |= ((Immediate & 0x00ff) >> 0);
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Bytes[3] |= ((Immediate & 0x0700) >> 8);
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};
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EncodeImmediate(&Target[0], static_cast<uint32_t>(Result) >> 00);
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EncodeImmediate(&Target[4], static_cast<uint32_t>(Result) >> 16);
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break;
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}
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case COFF::IMAGE_REL_ARM_BRANCH20T: {
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// The most significant 20-bits of the signed 21-bit relative displacement
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uint64_t Value =
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RE.Addend - (Sections[RE.SectionID].getLoadAddress() + RE.Offset) - 4;
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assert(static_cast<int32_t>(RE.Addend) <= INT32_MAX &&
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"relocation overflow");
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assert(static_cast<int32_t>(RE.Addend) >= INT32_MIN &&
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"relocation underflow");
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DEBUG(dbgs() << "\t\tOffset: " << RE.Offset
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<< " RelType: IMAGE_REL_ARM_BRANCH20T"
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<< " Value: " << static_cast<int32_t>(Value) << '\n');
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static_cast<void>(Value);
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llvm_unreachable("unimplemented relocation");
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break;
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}
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case COFF::IMAGE_REL_ARM_BRANCH24T: {
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// The most significant 24-bits of the signed 25-bit relative displacement
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uint64_t Value =
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RE.Addend - (Sections[RE.SectionID].getLoadAddress() + RE.Offset) - 4;
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assert(static_cast<int32_t>(RE.Addend) <= INT32_MAX &&
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"relocation overflow");
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assert(static_cast<int32_t>(RE.Addend) >= INT32_MIN &&
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"relocation underflow");
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DEBUG(dbgs() << "\t\tOffset: " << RE.Offset
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<< " RelType: IMAGE_REL_ARM_BRANCH24T"
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<< " Value: " << static_cast<int32_t>(Value) << '\n');
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static_cast<void>(Value);
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llvm_unreachable("unimplemented relocation");
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break;
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}
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case COFF::IMAGE_REL_ARM_BLX23T: {
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// The most significant 24-bits of the signed 25-bit relative displacement
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uint64_t Value =
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RE.Addend - (Sections[RE.SectionID].getLoadAddress() + RE.Offset) - 4;
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assert(static_cast<int32_t>(RE.Addend) <= INT32_MAX &&
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"relocation overflow");
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assert(static_cast<int32_t>(RE.Addend) >= INT32_MIN &&
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"relocation underflow");
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DEBUG(dbgs() << "\t\tOffset: " << RE.Offset
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<< " RelType: IMAGE_REL_ARM_BLX23T"
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<< " Value: " << static_cast<int32_t>(Value) << '\n');
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static_cast<void>(Value);
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llvm_unreachable("unimplemented relocation");
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break;
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}
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}
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}
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void registerEHFrames() override {}
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void deregisterEHFrames() override {}
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};
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}
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#endif
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