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//===-- HexagonDisassembler.cpp - Disassembler for Hexagon ISA ------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "Hexagon.h"
#include "MCTargetDesc/HexagonBaseInfo.h"
#include "MCTargetDesc/HexagonMCInstrInfo.h"
#include "MCTargetDesc/HexagonMCTargetDesc.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDisassembler.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCFixedLenDisassembler.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstrDesc.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
#include <array>
#include <vector>
using namespace llvm;
using namespace Hexagon;
#define DEBUG_TYPE "hexagon-disassembler"
// Pull DecodeStatus and its enum values into the global namespace.
typedef llvm::MCDisassembler::DecodeStatus DecodeStatus;
namespace {
/// \brief Hexagon disassembler for all Hexagon platforms.
class HexagonDisassembler : public MCDisassembler {
public:
std::unique_ptr<MCInst *> CurrentBundle;
HexagonDisassembler(MCSubtargetInfo const &STI, MCContext &Ctx)
: MCDisassembler(STI, Ctx), CurrentBundle(new MCInst *) {}
DecodeStatus getSingleInstruction(MCInst &Instr, MCInst &MCB,
ArrayRef<uint8_t> Bytes, uint64_t Address,
raw_ostream &VStream, raw_ostream &CStream,
bool &Complete) const;
DecodeStatus getInstruction(MCInst &Instr, uint64_t &Size,
ArrayRef<uint8_t> Bytes, uint64_t Address,
raw_ostream &VStream,
raw_ostream &CStream) const override;
};
}
static DecodeStatus DecodeModRegsRegisterClass(MCInst &Inst, unsigned RegNo,
uint64_t Address, const void *Decoder);
static DecodeStatus DecodeCtrRegsRegisterClass(MCInst &Inst, unsigned RegNo,
uint64_t Address, const void *Decoder);
static DecodeStatus DecodeCtrRegs64RegisterClass(MCInst &Inst, unsigned RegNo,
uint64_t Address, void const *Decoder);
static const uint16_t IntRegDecoderTable[] = {
Hexagon::R0, Hexagon::R1, Hexagon::R2, Hexagon::R3, Hexagon::R4,
Hexagon::R5, Hexagon::R6, Hexagon::R7, Hexagon::R8, Hexagon::R9,
Hexagon::R10, Hexagon::R11, Hexagon::R12, Hexagon::R13, Hexagon::R14,
Hexagon::R15, Hexagon::R16, Hexagon::R17, Hexagon::R18, Hexagon::R19,
Hexagon::R20, Hexagon::R21, Hexagon::R22, Hexagon::R23, Hexagon::R24,
Hexagon::R25, Hexagon::R26, Hexagon::R27, Hexagon::R28, Hexagon::R29,
Hexagon::R30, Hexagon::R31 };
static const uint16_t PredRegDecoderTable[] = { Hexagon::P0, Hexagon::P1,
Hexagon::P2, Hexagon::P3 };
static DecodeStatus DecodeRegisterClass(MCInst &Inst, unsigned RegNo,
const uint16_t Table[], size_t Size) {
if (RegNo < Size) {
Inst.addOperand(MCOperand::createReg(Table[RegNo]));
return MCDisassembler::Success;
}
else
return MCDisassembler::Fail;
}
static DecodeStatus DecodeIntRegsRegisterClass(MCInst &Inst, unsigned RegNo,
uint64_t /*Address*/,
void const *Decoder) {
if (RegNo > 31)
return MCDisassembler::Fail;
unsigned Register = IntRegDecoderTable[RegNo];
Inst.addOperand(MCOperand::createReg(Register));
return MCDisassembler::Success;
}
static DecodeStatus DecodeCtrRegsRegisterClass(MCInst &Inst, unsigned RegNo,
uint64_t /*Address*/, const void *Decoder) {
static const uint16_t CtrlRegDecoderTable[] = {
Hexagon::SA0, Hexagon::LC0, Hexagon::SA1, Hexagon::LC1,
Hexagon::P3_0, Hexagon::NoRegister, Hexagon::C6, Hexagon::C7,
Hexagon::USR, Hexagon::PC, Hexagon::UGP, Hexagon::GP,
Hexagon::CS0, Hexagon::CS1, Hexagon::UPCL, Hexagon::UPCH
};
if (RegNo >= sizeof(CtrlRegDecoderTable) / sizeof(CtrlRegDecoderTable[0]))
return MCDisassembler::Fail;
if (CtrlRegDecoderTable[RegNo] == Hexagon::NoRegister)
return MCDisassembler::Fail;
unsigned Register = CtrlRegDecoderTable[RegNo];
Inst.addOperand(MCOperand::createReg(Register));
return MCDisassembler::Success;
}
static DecodeStatus DecodeCtrRegs64RegisterClass(MCInst &Inst, unsigned RegNo,
uint64_t /*Address*/, void const *Decoder) {
static const uint16_t CtrlReg64DecoderTable[] = {
Hexagon::C1_0, Hexagon::NoRegister,
Hexagon::C3_2, Hexagon::NoRegister,
Hexagon::NoRegister, Hexagon::NoRegister,
Hexagon::C7_6, Hexagon::NoRegister,
Hexagon::C9_8, Hexagon::NoRegister,
Hexagon::C11_10, Hexagon::NoRegister,
Hexagon::CS, Hexagon::NoRegister,
Hexagon::UPC, Hexagon::NoRegister
};
if (RegNo >= sizeof(CtrlReg64DecoderTable) / sizeof(CtrlReg64DecoderTable[0]))
return MCDisassembler::Fail;
if (CtrlReg64DecoderTable[RegNo] == Hexagon::NoRegister)
return MCDisassembler::Fail;
unsigned Register = CtrlReg64DecoderTable[RegNo];
Inst.addOperand(MCOperand::createReg(Register));
return MCDisassembler::Success;
}
static DecodeStatus DecodeModRegsRegisterClass(MCInst &Inst, unsigned RegNo,
uint64_t /*Address*/, const void *Decoder) {
unsigned Register = 0;
switch (RegNo) {
case 0:
Register = Hexagon::M0;
break;
case 1:
Register = Hexagon::M1;
break;
default:
return MCDisassembler::Fail;
}
Inst.addOperand(MCOperand::createReg(Register));
return MCDisassembler::Success;
}
static DecodeStatus DecodeDoubleRegsRegisterClass(MCInst &Inst, unsigned RegNo,
uint64_t /*Address*/, const void *Decoder) {
static const uint16_t DoubleRegDecoderTable[] = {
Hexagon::D0, Hexagon::D1, Hexagon::D2, Hexagon::D3,
Hexagon::D4, Hexagon::D5, Hexagon::D6, Hexagon::D7,
Hexagon::D8, Hexagon::D9, Hexagon::D10, Hexagon::D11,
Hexagon::D12, Hexagon::D13, Hexagon::D14, Hexagon::D15
};
return (DecodeRegisterClass(Inst, RegNo >> 1,
DoubleRegDecoderTable,
sizeof (DoubleRegDecoderTable)));
}
static DecodeStatus DecodePredRegsRegisterClass(MCInst &Inst, unsigned RegNo,
uint64_t /*Address*/,
void const *Decoder) {
if (RegNo > 3)
return MCDisassembler::Fail;
unsigned Register = PredRegDecoderTable[RegNo];
Inst.addOperand(MCOperand::createReg(Register));
return MCDisassembler::Success;
}
#include "HexagonGenDisassemblerTables.inc"
static MCDisassembler *createHexagonDisassembler(Target const &T,
MCSubtargetInfo const &STI,
MCContext &Ctx) {
return new HexagonDisassembler(STI, Ctx);
}
extern "C" void LLVMInitializeHexagonDisassembler() {
TargetRegistry::RegisterMCDisassembler(TheHexagonTarget,
createHexagonDisassembler);
}
DecodeStatus HexagonDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
ArrayRef<uint8_t> Bytes,
uint64_t Address,
raw_ostream &os,
raw_ostream &cs) const {
DecodeStatus Result = DecodeStatus::Success;
bool Complete = false;
Size = 0;
*CurrentBundle = &MI;
MI.setOpcode(Hexagon::BUNDLE);
MI.addOperand(MCOperand::createImm(0));
while (Result == Success && Complete == false)
{
if (Bytes.size() < HEXAGON_INSTR_SIZE)
return MCDisassembler::Fail;
MCInst * Inst = new (getContext()) MCInst;
Result = getSingleInstruction(*Inst, MI, Bytes, Address, os, cs, Complete);
MI.addOperand(MCOperand::createInst(Inst));
Size += HEXAGON_INSTR_SIZE;
Bytes = Bytes.slice(HEXAGON_INSTR_SIZE);
}
return Result;
}
DecodeStatus HexagonDisassembler::getSingleInstruction(
MCInst &MI, MCInst &MCB, ArrayRef<uint8_t> Bytes, uint64_t Address,
raw_ostream &os, raw_ostream &cs, bool &Complete) const {
assert(Bytes.size() >= HEXAGON_INSTR_SIZE);
uint32_t Instruction =
llvm::support::endian::read<uint32_t, llvm::support::little,
llvm::support::unaligned>(Bytes.data());
auto BundleSize = HexagonMCInstrInfo::bundleSize(MCB);
if ((Instruction & HexagonII::INST_PARSE_MASK) ==
HexagonII::INST_PARSE_LOOP_END) {
if (BundleSize == 0)
HexagonMCInstrInfo::setInnerLoop(MCB);
else if (BundleSize == 1)
HexagonMCInstrInfo::setOuterLoop(MCB);
else
return DecodeStatus::Fail;
}
DecodeStatus Result = DecodeStatus::Success;
if ((Instruction & HexagonII::INST_PARSE_MASK) ==
HexagonII::INST_PARSE_PACKET_END)
Complete = true;
// Calling the auto-generated decoder function.
Result =
decodeInstruction(DecoderTable32, MI, Instruction, Address, this, STI);
return Result;
}
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