1 //===-- HexagonDisassembler.cpp - Disassembler for Hexagon ISA ------------===//
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3 // The LLVM Compiler Infrastructure
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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8 //===----------------------------------------------------------------------===//
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10 #include "MCTargetDesc/HexagonBaseInfo.h"
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11 #include "MCTargetDesc/HexagonMCTargetDesc.h"
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13 #include "llvm/MC/MCContext.h"
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14 #include "llvm/MC/MCDisassembler.h"
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15 #include "llvm/MC/MCExpr.h"
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16 #include "llvm/MC/MCFixedLenDisassembler.h"
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17 #include "llvm/MC/MCInst.h"
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18 #include "llvm/MC/MCInstrDesc.h"
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19 #include "llvm/MC/MCSubtargetInfo.h"
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20 #include "llvm/Support/Debug.h"
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21 #include "llvm/Support/ErrorHandling.h"
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22 #include "llvm/Support/LEB128.h"
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23 #include "llvm/Support/MemoryObject.h"
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24 #include "llvm/Support/raw_ostream.h"
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25 #include "llvm/Support/TargetRegistry.h"
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26 #include "llvm/Support/Endian.h"
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31 using namespace llvm;
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33 #define DEBUG_TYPE "hexagon-disassembler"
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35 // Pull DecodeStatus and its enum values into the global namespace.
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36 typedef llvm::MCDisassembler::DecodeStatus DecodeStatus;
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39 /// \brief Hexagon disassembler for all Hexagon platforms.
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40 class HexagonDisassembler : public MCDisassembler {
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42 HexagonDisassembler(MCSubtargetInfo const &STI, MCContext &Ctx)
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43 : MCDisassembler(STI, Ctx) {}
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45 DecodeStatus getInstruction(MCInst &instr, uint64_t &size,
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46 MemoryObject const ®ion, uint64_t address,
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47 raw_ostream &vStream, raw_ostream &cStream) const override;
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51 #include "HexagonGenDisassemblerTables.inc"
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53 static MCDisassembler *createHexagonDisassembler(Target const &T,
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54 MCSubtargetInfo const &STI,
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56 return new HexagonDisassembler(STI, Ctx);
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59 extern "C" void LLVMInitializeHexagonDisassembler() {
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60 TargetRegistry::RegisterMCDisassembler(TheHexagonTarget,
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61 createHexagonDisassembler);
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64 DecodeStatus HexagonDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
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65 MemoryObject const &Region,
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68 raw_ostream &cs) const {
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69 std::array<uint8_t, 4> Bytes;
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71 if (Region.readBytes(Address, Bytes.size(), Bytes.data()) == -1) {
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72 return MCDisassembler::Fail;
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75 llvm::support::endian::read<uint32_t, llvm::support::little,
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76 llvm::support::unaligned>(Bytes.data());
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78 // Remove parse bits.
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79 insn &= ~static_cast<uint32_t>(HexagonII::InstParseBits::INST_PARSE_MASK);
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80 return decodeInstruction(DecoderTable32, MI, insn, Address, this, STI);
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