mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-16 11:30:51 +00:00
6a222ec893
With this patch MCDisassembler::getInstruction takes an ArrayRef<uint8_t> instead of a MemoryObject. Even on X86 there is a maximum size an instruction can have. Given that, it seems way simpler and more efficient to just pass an ArrayRef to the disassembler instead of a MemoryObject and have it do a virtual call every time it wants some extra bytes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221751 91177308-0d34-0410-b5e6-96231b3b80d8
464 lines
16 KiB
C++
464 lines
16 KiB
C++
//===- SparcDisassembler.cpp - Disassembler for Sparc -----------*- 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 is part of the Sparc Disassembler.
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//
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//===----------------------------------------------------------------------===//
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#include "Sparc.h"
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#include "SparcRegisterInfo.h"
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#include "SparcSubtarget.h"
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#include "llvm/MC/MCDisassembler.h"
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#include "llvm/MC/MCFixedLenDisassembler.h"
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#include "llvm/Support/TargetRegistry.h"
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using namespace llvm;
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#define DEBUG_TYPE "sparc-disassembler"
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typedef MCDisassembler::DecodeStatus DecodeStatus;
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namespace {
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/// A disassembler class for Sparc.
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class SparcDisassembler : public MCDisassembler {
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public:
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SparcDisassembler(const MCSubtargetInfo &STI, MCContext &Ctx)
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: MCDisassembler(STI, Ctx) {}
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virtual ~SparcDisassembler() {}
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DecodeStatus getInstruction(MCInst &Instr, uint64_t &Size,
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ArrayRef<uint8_t> Bytes, uint64_t Address,
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raw_ostream &VStream,
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raw_ostream &CStream) const override;
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};
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}
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namespace llvm {
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extern Target TheSparcTarget, TheSparcV9Target;
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}
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static MCDisassembler *createSparcDisassembler(
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const Target &T,
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const MCSubtargetInfo &STI,
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MCContext &Ctx) {
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return new SparcDisassembler(STI, Ctx);
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}
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extern "C" void LLVMInitializeSparcDisassembler() {
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// Register the disassembler.
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TargetRegistry::RegisterMCDisassembler(TheSparcTarget,
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createSparcDisassembler);
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TargetRegistry::RegisterMCDisassembler(TheSparcV9Target,
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createSparcDisassembler);
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}
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static const unsigned IntRegDecoderTable[] = {
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SP::G0, SP::G1, SP::G2, SP::G3,
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SP::G4, SP::G5, SP::G6, SP::G7,
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SP::O0, SP::O1, SP::O2, SP::O3,
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SP::O4, SP::O5, SP::O6, SP::O7,
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SP::L0, SP::L1, SP::L2, SP::L3,
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SP::L4, SP::L5, SP::L6, SP::L7,
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SP::I0, SP::I1, SP::I2, SP::I3,
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SP::I4, SP::I5, SP::I6, SP::I7 };
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static const unsigned FPRegDecoderTable[] = {
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SP::F0, SP::F1, SP::F2, SP::F3,
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SP::F4, SP::F5, SP::F6, SP::F7,
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SP::F8, SP::F9, SP::F10, SP::F11,
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SP::F12, SP::F13, SP::F14, SP::F15,
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SP::F16, SP::F17, SP::F18, SP::F19,
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SP::F20, SP::F21, SP::F22, SP::F23,
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SP::F24, SP::F25, SP::F26, SP::F27,
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SP::F28, SP::F29, SP::F30, SP::F31 };
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static const unsigned DFPRegDecoderTable[] = {
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SP::D0, SP::D16, SP::D1, SP::D17,
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SP::D2, SP::D18, SP::D3, SP::D19,
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SP::D4, SP::D20, SP::D5, SP::D21,
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SP::D6, SP::D22, SP::D7, SP::D23,
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SP::D8, SP::D24, SP::D9, SP::D25,
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SP::D10, SP::D26, SP::D11, SP::D27,
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SP::D12, SP::D28, SP::D13, SP::D29,
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SP::D14, SP::D30, SP::D15, SP::D31 };
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static const unsigned QFPRegDecoderTable[] = {
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SP::Q0, SP::Q8, ~0U, ~0U,
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SP::Q1, SP::Q9, ~0U, ~0U,
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SP::Q2, SP::Q10, ~0U, ~0U,
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SP::Q3, SP::Q11, ~0U, ~0U,
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SP::Q4, SP::Q12, ~0U, ~0U,
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SP::Q5, SP::Q13, ~0U, ~0U,
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SP::Q6, SP::Q14, ~0U, ~0U,
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SP::Q7, SP::Q15, ~0U, ~0U } ;
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static const unsigned FCCRegDecoderTable[] = {
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SP::FCC0, SP::FCC1, SP::FCC2, SP::FCC3 };
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static DecodeStatus DecodeIntRegsRegisterClass(MCInst &Inst,
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unsigned RegNo,
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uint64_t Address,
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const void *Decoder) {
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if (RegNo > 31)
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return MCDisassembler::Fail;
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unsigned Reg = IntRegDecoderTable[RegNo];
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Inst.addOperand(MCOperand::CreateReg(Reg));
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return MCDisassembler::Success;
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}
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static DecodeStatus DecodeI64RegsRegisterClass(MCInst &Inst,
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unsigned RegNo,
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uint64_t Address,
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const void *Decoder) {
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if (RegNo > 31)
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return MCDisassembler::Fail;
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unsigned Reg = IntRegDecoderTable[RegNo];
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Inst.addOperand(MCOperand::CreateReg(Reg));
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return MCDisassembler::Success;
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}
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static DecodeStatus DecodeFPRegsRegisterClass(MCInst &Inst,
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unsigned RegNo,
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uint64_t Address,
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const void *Decoder) {
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if (RegNo > 31)
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return MCDisassembler::Fail;
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unsigned Reg = FPRegDecoderTable[RegNo];
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Inst.addOperand(MCOperand::CreateReg(Reg));
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return MCDisassembler::Success;
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}
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static DecodeStatus DecodeDFPRegsRegisterClass(MCInst &Inst,
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unsigned RegNo,
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uint64_t Address,
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const void *Decoder) {
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if (RegNo > 31)
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return MCDisassembler::Fail;
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unsigned Reg = DFPRegDecoderTable[RegNo];
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Inst.addOperand(MCOperand::CreateReg(Reg));
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return MCDisassembler::Success;
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}
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static DecodeStatus DecodeQFPRegsRegisterClass(MCInst &Inst,
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unsigned RegNo,
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uint64_t Address,
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const void *Decoder) {
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if (RegNo > 31)
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return MCDisassembler::Fail;
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unsigned Reg = QFPRegDecoderTable[RegNo];
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if (Reg == ~0U)
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return MCDisassembler::Fail;
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Inst.addOperand(MCOperand::CreateReg(Reg));
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return MCDisassembler::Success;
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}
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static DecodeStatus DecodeFCCRegsRegisterClass(MCInst &Inst, unsigned RegNo,
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uint64_t Address,
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const void *Decoder) {
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if (RegNo > 3)
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return MCDisassembler::Fail;
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Inst.addOperand(MCOperand::CreateReg(FCCRegDecoderTable[RegNo]));
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return MCDisassembler::Success;
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}
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static DecodeStatus DecodeLoadInt(MCInst &Inst, unsigned insn, uint64_t Address,
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const void *Decoder);
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static DecodeStatus DecodeLoadFP(MCInst &Inst, unsigned insn, uint64_t Address,
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const void *Decoder);
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static DecodeStatus DecodeLoadDFP(MCInst &Inst, unsigned insn, uint64_t Address,
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const void *Decoder);
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static DecodeStatus DecodeLoadQFP(MCInst &Inst, unsigned insn, uint64_t Address,
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const void *Decoder);
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static DecodeStatus DecodeStoreInt(MCInst &Inst, unsigned insn,
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uint64_t Address, const void *Decoder);
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static DecodeStatus DecodeStoreFP(MCInst &Inst, unsigned insn,
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uint64_t Address, const void *Decoder);
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static DecodeStatus DecodeStoreDFP(MCInst &Inst, unsigned insn,
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uint64_t Address, const void *Decoder);
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static DecodeStatus DecodeStoreQFP(MCInst &Inst, unsigned insn,
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uint64_t Address, const void *Decoder);
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static DecodeStatus DecodeCall(MCInst &Inst, unsigned insn,
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uint64_t Address, const void *Decoder);
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static DecodeStatus DecodeSIMM13(MCInst &Inst, unsigned insn,
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uint64_t Address, const void *Decoder);
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static DecodeStatus DecodeJMPL(MCInst &Inst, unsigned insn, uint64_t Address,
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const void *Decoder);
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static DecodeStatus DecodeReturn(MCInst &MI, unsigned insn, uint64_t Address,
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const void *Decoder);
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static DecodeStatus DecodeSWAP(MCInst &Inst, unsigned insn, uint64_t Address,
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const void *Decoder);
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#include "SparcGenDisassemblerTables.inc"
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/// Read four bytes from the ArrayRef and return 32 bit word.
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static DecodeStatus readInstruction32(ArrayRef<uint8_t> Bytes, uint64_t Address,
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uint64_t &Size, uint32_t &Insn) {
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// We want to read exactly 4 Bytes of data.
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if (Bytes.size() < 4) {
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Size = 0;
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return MCDisassembler::Fail;
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}
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// Encoded as a big-endian 32-bit word in the stream.
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Insn =
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(Bytes[3] << 0) | (Bytes[2] << 8) | (Bytes[1] << 16) | (Bytes[0] << 24);
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return MCDisassembler::Success;
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}
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DecodeStatus SparcDisassembler::getInstruction(MCInst &Instr, uint64_t &Size,
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ArrayRef<uint8_t> Bytes,
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uint64_t Address,
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raw_ostream &VStream,
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raw_ostream &CStream) const {
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uint32_t Insn;
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DecodeStatus Result = readInstruction32(Bytes, Address, Size, Insn);
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if (Result == MCDisassembler::Fail)
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return MCDisassembler::Fail;
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// Calling the auto-generated decoder function.
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Result =
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decodeInstruction(DecoderTableSparc32, Instr, Insn, Address, this, STI);
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if (Result != MCDisassembler::Fail) {
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Size = 4;
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return Result;
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}
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return MCDisassembler::Fail;
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}
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typedef DecodeStatus (*DecodeFunc)(MCInst &MI, unsigned insn, uint64_t Address,
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const void *Decoder);
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static DecodeStatus DecodeMem(MCInst &MI, unsigned insn, uint64_t Address,
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const void *Decoder,
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bool isLoad, DecodeFunc DecodeRD) {
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unsigned rd = fieldFromInstruction(insn, 25, 5);
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unsigned rs1 = fieldFromInstruction(insn, 14, 5);
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bool isImm = fieldFromInstruction(insn, 13, 1);
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unsigned rs2 = 0;
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unsigned simm13 = 0;
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if (isImm)
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simm13 = SignExtend32<13>(fieldFromInstruction(insn, 0, 13));
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else
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rs2 = fieldFromInstruction(insn, 0, 5);
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DecodeStatus status;
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if (isLoad) {
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status = DecodeRD(MI, rd, Address, Decoder);
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if (status != MCDisassembler::Success)
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return status;
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}
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// Decode rs1.
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status = DecodeIntRegsRegisterClass(MI, rs1, Address, Decoder);
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if (status != MCDisassembler::Success)
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return status;
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// Decode imm|rs2.
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if (isImm)
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MI.addOperand(MCOperand::CreateImm(simm13));
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else {
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status = DecodeIntRegsRegisterClass(MI, rs2, Address, Decoder);
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if (status != MCDisassembler::Success)
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return status;
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}
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if (!isLoad) {
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status = DecodeRD(MI, rd, Address, Decoder);
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if (status != MCDisassembler::Success)
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return status;
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}
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return MCDisassembler::Success;
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}
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static DecodeStatus DecodeLoadInt(MCInst &Inst, unsigned insn, uint64_t Address,
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const void *Decoder) {
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return DecodeMem(Inst, insn, Address, Decoder, true,
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DecodeIntRegsRegisterClass);
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}
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static DecodeStatus DecodeLoadFP(MCInst &Inst, unsigned insn, uint64_t Address,
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const void *Decoder) {
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return DecodeMem(Inst, insn, Address, Decoder, true,
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DecodeFPRegsRegisterClass);
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}
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static DecodeStatus DecodeLoadDFP(MCInst &Inst, unsigned insn, uint64_t Address,
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const void *Decoder) {
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return DecodeMem(Inst, insn, Address, Decoder, true,
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DecodeDFPRegsRegisterClass);
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}
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static DecodeStatus DecodeLoadQFP(MCInst &Inst, unsigned insn, uint64_t Address,
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const void *Decoder) {
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return DecodeMem(Inst, insn, Address, Decoder, true,
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DecodeQFPRegsRegisterClass);
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}
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static DecodeStatus DecodeStoreInt(MCInst &Inst, unsigned insn,
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uint64_t Address, const void *Decoder) {
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return DecodeMem(Inst, insn, Address, Decoder, false,
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DecodeIntRegsRegisterClass);
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}
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static DecodeStatus DecodeStoreFP(MCInst &Inst, unsigned insn, uint64_t Address,
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const void *Decoder) {
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return DecodeMem(Inst, insn, Address, Decoder, false,
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DecodeFPRegsRegisterClass);
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}
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static DecodeStatus DecodeStoreDFP(MCInst &Inst, unsigned insn,
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uint64_t Address, const void *Decoder) {
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return DecodeMem(Inst, insn, Address, Decoder, false,
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DecodeDFPRegsRegisterClass);
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}
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static DecodeStatus DecodeStoreQFP(MCInst &Inst, unsigned insn,
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uint64_t Address, const void *Decoder) {
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return DecodeMem(Inst, insn, Address, Decoder, false,
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DecodeQFPRegsRegisterClass);
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}
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static bool tryAddingSymbolicOperand(int64_t Value, bool isBranch,
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uint64_t Address, uint64_t Offset,
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uint64_t Width, MCInst &MI,
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const void *Decoder) {
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const MCDisassembler *Dis = static_cast<const MCDisassembler*>(Decoder);
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return Dis->tryAddingSymbolicOperand(MI, Value, Address, isBranch,
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Offset, Width);
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}
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static DecodeStatus DecodeCall(MCInst &MI, unsigned insn,
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uint64_t Address, const void *Decoder) {
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unsigned tgt = fieldFromInstruction(insn, 0, 30);
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tgt <<= 2;
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if (!tryAddingSymbolicOperand(tgt+Address, false, Address,
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0, 30, MI, Decoder))
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MI.addOperand(MCOperand::CreateImm(tgt));
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return MCDisassembler::Success;
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}
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static DecodeStatus DecodeSIMM13(MCInst &MI, unsigned insn,
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uint64_t Address, const void *Decoder) {
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unsigned tgt = SignExtend32<13>(fieldFromInstruction(insn, 0, 13));
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MI.addOperand(MCOperand::CreateImm(tgt));
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return MCDisassembler::Success;
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}
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static DecodeStatus DecodeJMPL(MCInst &MI, unsigned insn, uint64_t Address,
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const void *Decoder) {
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unsigned rd = fieldFromInstruction(insn, 25, 5);
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unsigned rs1 = fieldFromInstruction(insn, 14, 5);
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unsigned isImm = fieldFromInstruction(insn, 13, 1);
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unsigned rs2 = 0;
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unsigned simm13 = 0;
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if (isImm)
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simm13 = SignExtend32<13>(fieldFromInstruction(insn, 0, 13));
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else
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rs2 = fieldFromInstruction(insn, 0, 5);
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// Decode RD.
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DecodeStatus status = DecodeIntRegsRegisterClass(MI, rd, Address, Decoder);
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if (status != MCDisassembler::Success)
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return status;
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// Decode RS1.
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status = DecodeIntRegsRegisterClass(MI, rs1, Address, Decoder);
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if (status != MCDisassembler::Success)
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return status;
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// Decode RS1 | SIMM13.
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if (isImm)
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MI.addOperand(MCOperand::CreateImm(simm13));
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else {
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status = DecodeIntRegsRegisterClass(MI, rs2, Address, Decoder);
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if (status != MCDisassembler::Success)
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return status;
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}
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return MCDisassembler::Success;
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}
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static DecodeStatus DecodeReturn(MCInst &MI, unsigned insn, uint64_t Address,
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const void *Decoder) {
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unsigned rs1 = fieldFromInstruction(insn, 14, 5);
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unsigned isImm = fieldFromInstruction(insn, 13, 1);
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unsigned rs2 = 0;
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unsigned simm13 = 0;
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if (isImm)
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simm13 = SignExtend32<13>(fieldFromInstruction(insn, 0, 13));
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else
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rs2 = fieldFromInstruction(insn, 0, 5);
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// Decode RS1.
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DecodeStatus status = DecodeIntRegsRegisterClass(MI, rs1, Address, Decoder);
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if (status != MCDisassembler::Success)
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return status;
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// Decode RS2 | SIMM13.
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if (isImm)
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MI.addOperand(MCOperand::CreateImm(simm13));
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else {
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status = DecodeIntRegsRegisterClass(MI, rs2, Address, Decoder);
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if (status != MCDisassembler::Success)
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return status;
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}
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return MCDisassembler::Success;
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}
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static DecodeStatus DecodeSWAP(MCInst &MI, unsigned insn, uint64_t Address,
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const void *Decoder) {
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unsigned rd = fieldFromInstruction(insn, 25, 5);
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unsigned rs1 = fieldFromInstruction(insn, 14, 5);
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unsigned isImm = fieldFromInstruction(insn, 13, 1);
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unsigned rs2 = 0;
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unsigned simm13 = 0;
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if (isImm)
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simm13 = SignExtend32<13>(fieldFromInstruction(insn, 0, 13));
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else
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rs2 = fieldFromInstruction(insn, 0, 5);
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// Decode RD.
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DecodeStatus status = DecodeIntRegsRegisterClass(MI, rd, Address, Decoder);
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if (status != MCDisassembler::Success)
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return status;
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// Decode RS1.
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status = DecodeIntRegsRegisterClass(MI, rs1, Address, Decoder);
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if (status != MCDisassembler::Success)
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return status;
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// Decode RS1 | SIMM13.
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if (isImm)
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MI.addOperand(MCOperand::CreateImm(simm13));
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else {
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status = DecodeIntRegsRegisterClass(MI, rs2, Address, Decoder);
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if (status != MCDisassembler::Success)
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return status;
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}
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return MCDisassembler::Success;
|
|
}
|