LLVM  8.0.1
HexagonDisassembler.cpp
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1 //===- HexagonDisassembler.cpp - Disassembler for Hexagon ISA -------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #define DEBUG_TYPE "hexagon-disassembler"
11 
12 #include "MCTargetDesc/HexagonBaseInfo.h"
13 #include "MCTargetDesc/HexagonMCChecker.h"
14 #include "MCTargetDesc/HexagonMCInstrInfo.h"
15 #include "MCTargetDesc/HexagonMCTargetDesc.h"
16 #include "llvm/ADT/ArrayRef.h"
17 #include "llvm/ADT/STLExtras.h"
18 #include "llvm/MC/MCContext.h"
19 #include "llvm/MC/MCDisassembler/MCDisassembler.h"
20 #include "llvm/MC/MCExpr.h"
21 #include "llvm/MC/MCFixedLenDisassembler.h"
22 #include "llvm/MC/MCInst.h"
23 #include "llvm/MC/MCInstrInfo.h"
24 #include "llvm/MC/MCRegisterInfo.h"
25 #include "llvm/MC/MCSubtargetInfo.h"
26 #include "llvm/Support/Endian.h"
27 #include "llvm/Support/MathExtras.h"
28 #include "llvm/Support/TargetRegistry.h"
29 #include "llvm/Support/raw_ostream.h"
30 #include <cassert>
31 #include <cstddef>
32 #include <cstdint>
33 #include <memory>
34 
35 using namespace llvm;
36 using namespace Hexagon;
37 
38 using DecodeStatus = MCDisassembler::DecodeStatus;
39 
40 namespace {
41 
42 /// Hexagon disassembler for all Hexagon platforms.
43 class HexagonDisassembler : public MCDisassembler {
44 public:
45  std::unique_ptr<MCInstrInfo const> const MCII;
46  std::unique_ptr<MCInst *> CurrentBundle;
47  mutable MCInst const *CurrentExtender;
48 
49  HexagonDisassembler(const MCSubtargetInfo &STI, MCContext &Ctx,
50  MCInstrInfo const *MCII)
51  : MCDisassembler(STI, Ctx), MCII(MCII), CurrentBundle(new MCInst *),
52  CurrentExtender(nullptr) {}
53 
54  DecodeStatus getSingleInstruction(MCInst &Instr, MCInst &MCB,
55  ArrayRef<uint8_t> Bytes, uint64_t Address,
56  raw_ostream &VStream, raw_ostream &CStream,
57  bool &Complete) const;
58  DecodeStatus getInstruction(MCInst &Instr, uint64_t &Size,
59  ArrayRef<uint8_t> Bytes, uint64_t Address,
60  raw_ostream &VStream,
61  raw_ostream &CStream) const override;
62  void remapInstruction(MCInst &Instr) const;
63 };
64 
65 static uint64_t fullValue(HexagonDisassembler const &Disassembler, MCInst &MI,
66  int64_t Value) {
67  MCInstrInfo MCII = *Disassembler.MCII;
68  if (!Disassembler.CurrentExtender ||
69  MI.size() != HexagonMCInstrInfo::getExtendableOp(MCII, MI))
70  return Value;
71  unsigned Alignment = HexagonMCInstrInfo::getExtentAlignment(MCII, MI);
72  uint32_t Lower6 = static_cast<uint32_t>(Value >> Alignment) & 0x3f;
73  int64_t Bits;
74  bool Success =
75  Disassembler.CurrentExtender->getOperand(0).getExpr()->evaluateAsAbsolute(
76  Bits);
77  assert(Success);
78  (void)Success;
79  uint64_t Upper26 = static_cast<uint64_t>(Bits);
80  uint64_t Operand = Upper26 | Lower6;
81  return Operand;
82 }
83 static HexagonDisassembler const &disassembler(void const *Decoder) {
84  return *static_cast<HexagonDisassembler const *>(Decoder);
85 }
86 template <size_t T>
87 static void signedDecoder(MCInst &MI, unsigned tmp, const void *Decoder) {
88  HexagonDisassembler const &Disassembler = disassembler(Decoder);
89  int64_t FullValue = fullValue(Disassembler, MI, SignExtend64<T>(tmp));
90  int64_t Extended = SignExtend64<32>(FullValue);
91  HexagonMCInstrInfo::addConstant(MI, Extended, Disassembler.getContext());
92 }
93 }
94 
95 // Forward declare these because the auto-generated code will reference them.
96 // Definitions are further down.
97 
98 static DecodeStatus DecodeIntRegsRegisterClass(MCInst &Inst, unsigned RegNo,
99  uint64_t Address,
100  const void *Decoder);
101 static DecodeStatus DecodeGeneralSubRegsRegisterClass(MCInst &Inst,
102  unsigned RegNo,
103  uint64_t Address,
104  const void *Decoder);
105 static DecodeStatus DecodeIntRegsLow8RegisterClass(MCInst &Inst, unsigned RegNo,
106  uint64_t Address,
107  const void *Decoder);
108 static DecodeStatus DecodeHvxVRRegisterClass(MCInst &Inst, unsigned RegNo,
109  uint64_t Address,
110  const void *Decoder);
111 static DecodeStatus DecodeDoubleRegsRegisterClass(MCInst &Inst, unsigned RegNo,
112  uint64_t Address,
113  const void *Decoder);
114 static DecodeStatus
115 DecodeGeneralDoubleLow8RegsRegisterClass(MCInst &Inst, unsigned RegNo,
116  uint64_t Address, const void *Decoder);
117 static DecodeStatus DecodeHvxWRRegisterClass(MCInst &Inst, unsigned RegNo,
118  uint64_t Address,
119  const void *Decoder);
120 static DecodeStatus DecodeHvxVQRRegisterClass(MCInst &Inst,
121  unsigned RegNo,
122  uint64_t Address,
123  const void *Decoder);
124 static DecodeStatus DecodePredRegsRegisterClass(MCInst &Inst, unsigned RegNo,
125  uint64_t Address,
126  const void *Decoder);
127 static DecodeStatus DecodeHvxQRRegisterClass(MCInst &Inst, unsigned RegNo,
128  uint64_t Address,
129  const void *Decoder);
130 static DecodeStatus DecodeCtrRegsRegisterClass(MCInst &Inst, unsigned RegNo,
131  uint64_t Address,
132  const void *Decoder);
133 static DecodeStatus DecodeGuestRegsRegisterClass(MCInst &Inst, unsigned RegNo,
134  uint64_t Address,
135  const void *Decoder);
136 static DecodeStatus DecodeModRegsRegisterClass(MCInst &Inst, unsigned RegNo,
137  uint64_t Address,
138  const void *Decoder);
139 static DecodeStatus DecodeCtrRegs64RegisterClass(MCInst &Inst, unsigned RegNo,
140  uint64_t Address,
141  const void *Decoder);
142 static DecodeStatus DecodeGuestRegs64RegisterClass(MCInst &Inst, unsigned RegNo,
143  uint64_t Address,
144  const void *Decoder);
145 
146 static DecodeStatus unsignedImmDecoder(MCInst &MI, unsigned tmp,
147  uint64_t Address, const void *Decoder);
148 static DecodeStatus s32_0ImmDecoder(MCInst &MI, unsigned tmp,
149  uint64_t /*Address*/, const void *Decoder);
150 static DecodeStatus brtargetDecoder(MCInst &MI, unsigned tmp, uint64_t Address,
151  const void *Decoder);
152 #include "HexagonDepDecoders.h"
153 #include "HexagonGenDisassemblerTables.inc"
154 
155 static MCDisassembler *createHexagonDisassembler(const Target &T,
156  const MCSubtargetInfo &STI,
157  MCContext &Ctx) {
158  return new HexagonDisassembler(STI, Ctx, T.createMCInstrInfo());
159 }
160 
161 extern "C" void LLVMInitializeHexagonDisassembler() {
162  TargetRegistry::RegisterMCDisassembler(getTheHexagonTarget(),
163  createHexagonDisassembler);
164 }
165 
166 DecodeStatus HexagonDisassembler::getInstruction(MCInst &MI, uint64_t &Size,
167  ArrayRef<uint8_t> Bytes,
168  uint64_t Address,
169  raw_ostream &os,
170  raw_ostream &cs) const {
171  DecodeStatus Result = DecodeStatus::Success;
172  bool Complete = false;
173  Size = 0;
174 
175  *CurrentBundle = &MI;
176  MI.setOpcode(Hexagon::BUNDLE);
177  MI.addOperand(MCOperand::createImm(0));
178  while (Result == Success && !Complete) {
179  if (Bytes.size() < HEXAGON_INSTR_SIZE)
180  return MCDisassembler::Fail;
181  MCInst *Inst = new (getContext()) MCInst;
182  Result = getSingleInstruction(*Inst, MI, Bytes, Address, os, cs, Complete);
183  MI.addOperand(MCOperand::createInst(Inst));
184  Size += HEXAGON_INSTR_SIZE;
185  Bytes = Bytes.slice(HEXAGON_INSTR_SIZE);
186  }
187  if (Result == MCDisassembler::Fail)
188  return Result;
189  if (Size > HEXAGON_MAX_PACKET_SIZE)
190  return MCDisassembler::Fail;
191  HexagonMCChecker Checker(getContext(), *MCII, STI, MI,
192  *getContext().getRegisterInfo(), false);
193  if (!Checker.check())
194  return MCDisassembler::Fail;
195  remapInstruction(MI);
196  return MCDisassembler::Success;
197 }
198 
199 void HexagonDisassembler::remapInstruction(MCInst &Instr) const {
200  for (auto I: HexagonMCInstrInfo::bundleInstructions(Instr)) {
201  auto &MI = const_cast<MCInst &>(*I.getInst());
202  switch (MI.getOpcode()) {
203  case Hexagon::S2_allocframe:
204  if (MI.getOperand(0).getReg() == Hexagon::R29) {
205  MI.setOpcode(Hexagon::S6_allocframe_to_raw);
206  MI.erase(MI.begin () + 1);
207  MI.erase(MI.begin ());
208  }
209  break;
210  case Hexagon::L2_deallocframe:
211  if (MI.getOperand(0).getReg() == Hexagon::D15 &&
212  MI.getOperand(1).getReg() == Hexagon::R30) {
213  MI.setOpcode(L6_deallocframe_map_to_raw);
214  MI.erase(MI.begin () + 1);
215  MI.erase(MI.begin ());
216  }
217  break;
218  case Hexagon::L4_return:
219  if (MI.getOperand(0).getReg() == Hexagon::D15 &&
220  MI.getOperand(1).getReg() == Hexagon::R30) {
221  MI.setOpcode(L6_return_map_to_raw);
222  MI.erase(MI.begin () + 1);
223  MI.erase(MI.begin ());
224  }
225  break;
226  case Hexagon::L4_return_t:
227  if (MI.getOperand(0).getReg() == Hexagon::D15 &&
228  MI.getOperand(2).getReg() == Hexagon::R30) {
229  MI.setOpcode(L4_return_map_to_raw_t);
230  MI.erase(MI.begin () + 2);
231  MI.erase(MI.begin ());
232  }
233  break;
234  case Hexagon::L4_return_f:
235  if (MI.getOperand(0).getReg() == Hexagon::D15 &&
236  MI.getOperand(2).getReg() == Hexagon::R30) {
237  MI.setOpcode(L4_return_map_to_raw_f);
238  MI.erase(MI.begin () + 2);
239  MI.erase(MI.begin ());
240  }
241  break;
242  case Hexagon::L4_return_tnew_pt:
243  if (MI.getOperand(0).getReg() == Hexagon::D15 &&
244  MI.getOperand(2).getReg() == Hexagon::R30) {
245  MI.setOpcode(L4_return_map_to_raw_tnew_pt);
246  MI.erase(MI.begin () + 2);
247  MI.erase(MI.begin ());
248  }
249  break;
250  case Hexagon::L4_return_fnew_pt:
251  if (MI.getOperand(0).getReg() == Hexagon::D15 &&
252  MI.getOperand(2).getReg() == Hexagon::R30) {
253  MI.setOpcode(L4_return_map_to_raw_fnew_pt);
254  MI.erase(MI.begin () + 2);
255  MI.erase(MI.begin ());
256  }
257  break;
258  case Hexagon::L4_return_tnew_pnt:
259  if (MI.getOperand(0).getReg() == Hexagon::D15 &&
260  MI.getOperand(2).getReg() == Hexagon::R30) {
261  MI.setOpcode(L4_return_map_to_raw_tnew_pnt);
262  MI.erase(MI.begin () + 2);
263  MI.erase(MI.begin ());
264  }
265  break;
266  case Hexagon::L4_return_fnew_pnt:
267  if (MI.getOperand(0).getReg() == Hexagon::D15 &&
268  MI.getOperand(2).getReg() == Hexagon::R30) {
269  MI.setOpcode(L4_return_map_to_raw_fnew_pnt);
270  MI.erase(MI.begin () + 2);
271  MI.erase(MI.begin ());
272  }
273  break;
274  }
275  }
276 }
277 
278 static void adjustDuplex(MCInst &MI, MCContext &Context) {
279  switch (MI.getOpcode()) {
280  case Hexagon::SA1_setin1:
281  MI.insert(MI.begin() + 1,
282  MCOperand::createExpr(MCConstantExpr::create(-1, Context)));
283  break;
284  case Hexagon::SA1_dec:
285  MI.insert(MI.begin() + 2,
286  MCOperand::createExpr(MCConstantExpr::create(-1, Context)));
287  break;
288  default:
289  break;
290  }
291 }
292 
293 DecodeStatus HexagonDisassembler::getSingleInstruction(
294  MCInst &MI, MCInst &MCB, ArrayRef<uint8_t> Bytes, uint64_t Address,
295  raw_ostream &os, raw_ostream &cs, bool &Complete) const {
296  assert(Bytes.size() >= HEXAGON_INSTR_SIZE);
297 
298  uint32_t Instruction = support::endian::read32le(Bytes.data());
299 
300  auto BundleSize = HexagonMCInstrInfo::bundleSize(MCB);
301  if ((Instruction & HexagonII::INST_PARSE_MASK) ==
302  HexagonII::INST_PARSE_LOOP_END) {
303  if (BundleSize == 0)
304  HexagonMCInstrInfo::setInnerLoop(MCB);
305  else if (BundleSize == 1)
306  HexagonMCInstrInfo::setOuterLoop(MCB);
307  else
308  return DecodeStatus::Fail;
309  }
310 
311  CurrentExtender = HexagonMCInstrInfo::extenderForIndex(
312  MCB, HexagonMCInstrInfo::bundleSize(MCB));
313 
314  DecodeStatus Result = DecodeStatus::Fail;
315  if ((Instruction & HexagonII::INST_PARSE_MASK) ==
316  HexagonII::INST_PARSE_DUPLEX) {
317  unsigned duplexIClass;
318  uint8_t const *DecodeLow, *DecodeHigh;
319  duplexIClass = ((Instruction >> 28) & 0xe) | ((Instruction >> 13) & 0x1);
320  switch (duplexIClass) {
321  default:
322  return MCDisassembler::Fail;
323  case 0:
324  DecodeLow = DecoderTableSUBINSN_L132;
325  DecodeHigh = DecoderTableSUBINSN_L132;
326  break;
327  case 1:
328  DecodeLow = DecoderTableSUBINSN_L232;
329  DecodeHigh = DecoderTableSUBINSN_L132;
330  break;
331  case 2:
332  DecodeLow = DecoderTableSUBINSN_L232;
333  DecodeHigh = DecoderTableSUBINSN_L232;
334  break;
335  case 3:
336  DecodeLow = DecoderTableSUBINSN_A32;
337  DecodeHigh = DecoderTableSUBINSN_A32;
338  break;
339  case 4:
340  DecodeLow = DecoderTableSUBINSN_L132;
341  DecodeHigh = DecoderTableSUBINSN_A32;
342  break;
343  case 5:
344  DecodeLow = DecoderTableSUBINSN_L232;
345  DecodeHigh = DecoderTableSUBINSN_A32;
346  break;
347  case 6:
348  DecodeLow = DecoderTableSUBINSN_S132;
349  DecodeHigh = DecoderTableSUBINSN_A32;
350  break;
351  case 7:
352  DecodeLow = DecoderTableSUBINSN_S232;
353  DecodeHigh = DecoderTableSUBINSN_A32;
354  break;
355  case 8:
356  DecodeLow = DecoderTableSUBINSN_S132;
357  DecodeHigh = DecoderTableSUBINSN_L132;
358  break;
359  case 9:
360  DecodeLow = DecoderTableSUBINSN_S132;
361  DecodeHigh = DecoderTableSUBINSN_L232;
362  break;
363  case 10:
364  DecodeLow = DecoderTableSUBINSN_S132;
365  DecodeHigh = DecoderTableSUBINSN_S132;
366  break;
367  case 11:
368  DecodeLow = DecoderTableSUBINSN_S232;
369  DecodeHigh = DecoderTableSUBINSN_S132;
370  break;
371  case 12:
372  DecodeLow = DecoderTableSUBINSN_S232;
373  DecodeHigh = DecoderTableSUBINSN_L132;
374  break;
375  case 13:
376  DecodeLow = DecoderTableSUBINSN_S232;
377  DecodeHigh = DecoderTableSUBINSN_L232;
378  break;
379  case 14:
380  DecodeLow = DecoderTableSUBINSN_S232;
381  DecodeHigh = DecoderTableSUBINSN_S232;
382  break;
383  }
384  MI.setOpcode(Hexagon::DuplexIClass0 + duplexIClass);
385  MCInst *MILow = new (getContext()) MCInst;
386  MCInst *MIHigh = new (getContext()) MCInst;
387  auto TmpExtender = CurrentExtender;
388  CurrentExtender =
389  nullptr; // constant extenders in duplex must always be in slot 1
390  Result = decodeInstruction(DecodeLow, *MILow, Instruction & 0x1fff, Address,
391  this, STI);
392  CurrentExtender = TmpExtender;
393  if (Result != DecodeStatus::Success)
394  return DecodeStatus::Fail;
395  adjustDuplex(*MILow, getContext());
396  Result = decodeInstruction(
397  DecodeHigh, *MIHigh, (Instruction >> 16) & 0x1fff, Address, this, STI);
398  if (Result != DecodeStatus::Success)
399  return DecodeStatus::Fail;
400  adjustDuplex(*MIHigh, getContext());
401  MCOperand OPLow = MCOperand::createInst(MILow);
402  MCOperand OPHigh = MCOperand::createInst(MIHigh);
403  MI.addOperand(OPLow);
404  MI.addOperand(OPHigh);
405  Complete = true;
406  } else {
407  if ((Instruction & HexagonII::INST_PARSE_MASK) ==
408  HexagonII::INST_PARSE_PACKET_END)
409  Complete = true;
410 
411  if (CurrentExtender != nullptr)
412  Result = decodeInstruction(DecoderTableMustExtend32, MI, Instruction,
413  Address, this, STI);
414 
415  if (Result != MCDisassembler::Success)
416  Result = decodeInstruction(DecoderTable32, MI, Instruction, Address, this,
417  STI);
418 
419  if (Result != MCDisassembler::Success &&
420  STI.getFeatureBits()[Hexagon::ExtensionHVX])
421  Result = decodeInstruction(DecoderTableEXT_mmvec32, MI, Instruction,
422  Address, this, STI);
423 
424  }
425 
426  switch (MI.getOpcode()) {
427  case Hexagon::J4_cmpeqn1_f_jumpnv_nt:
428  case Hexagon::J4_cmpeqn1_f_jumpnv_t:
429  case Hexagon::J4_cmpeqn1_fp0_jump_nt:
430  case Hexagon::J4_cmpeqn1_fp0_jump_t:
431  case Hexagon::J4_cmpeqn1_fp1_jump_nt:
432  case Hexagon::J4_cmpeqn1_fp1_jump_t:
433  case Hexagon::J4_cmpeqn1_t_jumpnv_nt:
434  case Hexagon::J4_cmpeqn1_t_jumpnv_t:
435  case Hexagon::J4_cmpeqn1_tp0_jump_nt:
436  case Hexagon::J4_cmpeqn1_tp0_jump_t:
437  case Hexagon::J4_cmpeqn1_tp1_jump_nt:
438  case Hexagon::J4_cmpeqn1_tp1_jump_t:
439  case Hexagon::J4_cmpgtn1_f_jumpnv_nt:
440  case Hexagon::J4_cmpgtn1_f_jumpnv_t:
441  case Hexagon::J4_cmpgtn1_fp0_jump_nt:
442  case Hexagon::J4_cmpgtn1_fp0_jump_t:
443  case Hexagon::J4_cmpgtn1_fp1_jump_nt:
444  case Hexagon::J4_cmpgtn1_fp1_jump_t:
445  case Hexagon::J4_cmpgtn1_t_jumpnv_nt:
446  case Hexagon::J4_cmpgtn1_t_jumpnv_t:
447  case Hexagon::J4_cmpgtn1_tp0_jump_nt:
448  case Hexagon::J4_cmpgtn1_tp0_jump_t:
449  case Hexagon::J4_cmpgtn1_tp1_jump_nt:
450  case Hexagon::J4_cmpgtn1_tp1_jump_t:
451  MI.insert(MI.begin() + 1,
452  MCOperand::createExpr(MCConstantExpr::create(-1, getContext())));
453  break;
454  default:
455  break;
456  }
457 
458  if (HexagonMCInstrInfo::isNewValue(*MCII, MI)) {
459  unsigned OpIndex = HexagonMCInstrInfo::getNewValueOp(*MCII, MI);
460  MCOperand &MCO = MI.getOperand(OpIndex);
461  assert(MCO.isReg() && "New value consumers must be registers");
462  unsigned Register =
463  getContext().getRegisterInfo()->getEncodingValue(MCO.getReg());
464  if ((Register & 0x6) == 0)
465  // HexagonPRM 10.11 Bit 1-2 == 0 is reserved
466  return MCDisassembler::Fail;
467  unsigned Lookback = (Register & 0x6) >> 1;
468  unsigned Offset = 1;
469  bool Vector = HexagonMCInstrInfo::isVector(*MCII, MI);
470  bool PrevVector = false;
471  auto Instructions = HexagonMCInstrInfo::bundleInstructions(**CurrentBundle);
472  auto i = Instructions.end() - 1;
473  for (auto n = Instructions.begin() - 1;; --i, ++Offset) {
474  if (i == n)
475  // Couldn't find producer
476  return MCDisassembler::Fail;
477  bool CurrentVector = HexagonMCInstrInfo::isVector(*MCII, *i->getInst());
478  if (Vector && !CurrentVector)
479  // Skip scalars when calculating distances for vectors
480  ++Lookback;
481  if (HexagonMCInstrInfo::isImmext(*i->getInst()) && (Vector == PrevVector))
482  ++Lookback;
483  PrevVector = CurrentVector;
484  if (Offset == Lookback)
485  break;
486  }
487  auto const &Inst = *i->getInst();
488  bool SubregBit = (Register & 0x1) != 0;
489  if (HexagonMCInstrInfo::hasNewValue2(*MCII, Inst)) {
490  // If subreg bit is set we're selecting the second produced newvalue
491  unsigned Producer = SubregBit ?
492  HexagonMCInstrInfo::getNewValueOperand(*MCII, Inst).getReg() :
493  HexagonMCInstrInfo::getNewValueOperand2(*MCII, Inst).getReg();
494  assert(Producer != Hexagon::NoRegister);
495  MCO.setReg(Producer);
496  } else if (HexagonMCInstrInfo::hasNewValue(*MCII, Inst)) {
497  unsigned Producer =
498  HexagonMCInstrInfo::getNewValueOperand(*MCII, Inst).getReg();
499  if (Producer >= Hexagon::W0 && Producer <= Hexagon::W15)
500  Producer = ((Producer - Hexagon::W0) << 1) + SubregBit + Hexagon::V0;
501  else if (SubregBit)
502  // Hexagon PRM 10.11 New-value operands
503  // Nt[0] is reserved and should always be encoded as zero.
504  return MCDisassembler::Fail;
505  assert(Producer != Hexagon::NoRegister);
506  MCO.setReg(Producer);
507  } else
508  return MCDisassembler::Fail;
509  }
510 
511  if (CurrentExtender != nullptr) {
512  MCInst const &Inst = HexagonMCInstrInfo::isDuplex(*MCII, MI)
513  ? *MI.getOperand(1).getInst()
514  : MI;
515  if (!HexagonMCInstrInfo::isExtendable(*MCII, Inst) &&
516  !HexagonMCInstrInfo::isExtended(*MCII, Inst))
517  return MCDisassembler::Fail;
518  }
519  return Result;
520 }
521 
522 static DecodeStatus DecodeRegisterClass(MCInst &Inst, unsigned RegNo,
523  ArrayRef<MCPhysReg> Table) {
524  if (RegNo < Table.size()) {
525  Inst.addOperand(MCOperand::createReg(Table[RegNo]));
526  return MCDisassembler::Success;
527  }
528 
529  return MCDisassembler::Fail;
530 }
531 
532 static DecodeStatus DecodeIntRegsLow8RegisterClass(MCInst &Inst, unsigned RegNo,
533  uint64_t Address,
534  const void *Decoder) {
535  return DecodeIntRegsRegisterClass(Inst, RegNo, Address, Decoder);
536 }
537 
538 static DecodeStatus DecodeIntRegsRegisterClass(MCInst &Inst, unsigned RegNo,
539  uint64_t Address,
540  const void *Decoder) {
541  static const MCPhysReg IntRegDecoderTable[] = {
542  Hexagon::R0, Hexagon::R1, Hexagon::R2, Hexagon::R3, Hexagon::R4,
543  Hexagon::R5, Hexagon::R6, Hexagon::R7, Hexagon::R8, Hexagon::R9,
544  Hexagon::R10, Hexagon::R11, Hexagon::R12, Hexagon::R13, Hexagon::R14,
545  Hexagon::R15, Hexagon::R16, Hexagon::R17, Hexagon::R18, Hexagon::R19,
546  Hexagon::R20, Hexagon::R21, Hexagon::R22, Hexagon::R23, Hexagon::R24,
547  Hexagon::R25, Hexagon::R26, Hexagon::R27, Hexagon::R28, Hexagon::R29,
548  Hexagon::R30, Hexagon::R31};
549 
550  return DecodeRegisterClass(Inst, RegNo, IntRegDecoderTable);
551 }
552 
553 static DecodeStatus DecodeGeneralSubRegsRegisterClass(MCInst &Inst,
554  unsigned RegNo,
555  uint64_t Address,
556  const void *Decoder) {
557  static const MCPhysReg GeneralSubRegDecoderTable[] = {
558  Hexagon::R0, Hexagon::R1, Hexagon::R2, Hexagon::R3,
559  Hexagon::R4, Hexagon::R5, Hexagon::R6, Hexagon::R7,
560  Hexagon::R16, Hexagon::R17, Hexagon::R18, Hexagon::R19,
561  Hexagon::R20, Hexagon::R21, Hexagon::R22, Hexagon::R23,
562  };
563 
564  return DecodeRegisterClass(Inst, RegNo, GeneralSubRegDecoderTable);
565 }
566 
567 static DecodeStatus DecodeHvxVRRegisterClass(MCInst &Inst, unsigned RegNo,
568  uint64_t /*Address*/,
569  const void *Decoder) {
570  static const MCPhysReg HvxVRDecoderTable[] = {
571  Hexagon::V0, Hexagon::V1, Hexagon::V2, Hexagon::V3, Hexagon::V4,
572  Hexagon::V5, Hexagon::V6, Hexagon::V7, Hexagon::V8, Hexagon::V9,
573  Hexagon::V10, Hexagon::V11, Hexagon::V12, Hexagon::V13, Hexagon::V14,
574  Hexagon::V15, Hexagon::V16, Hexagon::V17, Hexagon::V18, Hexagon::V19,
575  Hexagon::V20, Hexagon::V21, Hexagon::V22, Hexagon::V23, Hexagon::V24,
576  Hexagon::V25, Hexagon::V26, Hexagon::V27, Hexagon::V28, Hexagon::V29,
577  Hexagon::V30, Hexagon::V31};
578 
579  return DecodeRegisterClass(Inst, RegNo, HvxVRDecoderTable);
580 }
581 
582 static DecodeStatus DecodeDoubleRegsRegisterClass(MCInst &Inst, unsigned RegNo,
583  uint64_t /*Address*/,
584  const void *Decoder) {
585  static const MCPhysReg DoubleRegDecoderTable[] = {
586  Hexagon::D0, Hexagon::D1, Hexagon::D2, Hexagon::D3,
587  Hexagon::D4, Hexagon::D5, Hexagon::D6, Hexagon::D7,
588  Hexagon::D8, Hexagon::D9, Hexagon::D10, Hexagon::D11,
589  Hexagon::D12, Hexagon::D13, Hexagon::D14, Hexagon::D15};
590 
591  return DecodeRegisterClass(Inst, RegNo >> 1, DoubleRegDecoderTable);
592 }
593 
594 static DecodeStatus DecodeGeneralDoubleLow8RegsRegisterClass(
595  MCInst &Inst, unsigned RegNo, uint64_t /*Address*/, const void *Decoder) {
596  static const MCPhysReg GeneralDoubleLow8RegDecoderTable[] = {
597  Hexagon::D0, Hexagon::D1, Hexagon::D2, Hexagon::D3,
598  Hexagon::D8, Hexagon::D9, Hexagon::D10, Hexagon::D11};
599 
600  return DecodeRegisterClass(Inst, RegNo, GeneralDoubleLow8RegDecoderTable);
601 }
602 
603 static DecodeStatus DecodeHvxWRRegisterClass(MCInst &Inst, unsigned RegNo,
604  uint64_t /*Address*/,
605  const void *Decoder) {
606  static const MCPhysReg HvxWRDecoderTable[] = {
607  Hexagon::W0, Hexagon::W1, Hexagon::W2, Hexagon::W3,
608  Hexagon::W4, Hexagon::W5, Hexagon::W6, Hexagon::W7,
609  Hexagon::W8, Hexagon::W9, Hexagon::W10, Hexagon::W11,
610  Hexagon::W12, Hexagon::W13, Hexagon::W14, Hexagon::W15};
611 
612  return (DecodeRegisterClass(Inst, RegNo >> 1, HvxWRDecoderTable));
613 }
614 
615 LLVM_ATTRIBUTE_UNUSED // Suppress warning temporarily.
616 static DecodeStatus DecodeHvxVQRRegisterClass(MCInst &Inst,
617  unsigned RegNo,
618  uint64_t /*Address*/,
619  const void *Decoder) {
620  static const MCPhysReg HvxVQRDecoderTable[] = {
621  Hexagon::VQ0, Hexagon::VQ1, Hexagon::VQ2, Hexagon::VQ3,
622  Hexagon::VQ4, Hexagon::VQ5, Hexagon::VQ6, Hexagon::VQ7};
623 
624  return DecodeRegisterClass(Inst, RegNo >> 2, HvxVQRDecoderTable);
625 }
626 
627 static DecodeStatus DecodePredRegsRegisterClass(MCInst &Inst, unsigned RegNo,
628  uint64_t /*Address*/,
629  const void *Decoder) {
630  static const MCPhysReg PredRegDecoderTable[] = {Hexagon::P0, Hexagon::P1,
631  Hexagon::P2, Hexagon::P3};
632 
633  return DecodeRegisterClass(Inst, RegNo, PredRegDecoderTable);
634 }
635 
636 static DecodeStatus DecodeHvxQRRegisterClass(MCInst &Inst, unsigned RegNo,
637  uint64_t /*Address*/,
638  const void *Decoder) {
639  static const MCPhysReg HvxQRDecoderTable[] = {Hexagon::Q0, Hexagon::Q1,
640  Hexagon::Q2, Hexagon::Q3};
641 
642  return DecodeRegisterClass(Inst, RegNo, HvxQRDecoderTable);
643 }
644 
645 static DecodeStatus DecodeCtrRegsRegisterClass(MCInst &Inst, unsigned RegNo,
646  uint64_t /*Address*/,
647  const void *Decoder) {
648  using namespace Hexagon;
649 
650  static const MCPhysReg CtrlRegDecoderTable[] = {
651  /* 0 */ SA0, LC0, SA1, LC1,
652  /* 4 */ P3_0, C5, M0, M1,
653  /* 8 */ USR, PC, UGP, GP,
654  /* 12 */ CS0, CS1, UPCYCLELO, UPCYCLEHI,
655  /* 16 */ FRAMELIMIT, FRAMEKEY, PKTCOUNTLO, PKTCOUNTHI,
656  /* 20 */ 0, 0, 0, 0,
657  /* 24 */ 0, 0, 0, 0,
658  /* 28 */ 0, 0, UTIMERLO, UTIMERHI
659  };
660 
661  if (RegNo >= array_lengthof(CtrlRegDecoderTable))
662  return MCDisassembler::Fail;
663 
664  static_assert(NoRegister == 0, "Expecting NoRegister to be 0");
665  if (CtrlRegDecoderTable[RegNo] == NoRegister)
666  return MCDisassembler::Fail;
667 
668  unsigned Register = CtrlRegDecoderTable[RegNo];
669  Inst.addOperand(MCOperand::createReg(Register));
670  return MCDisassembler::Success;
671 }
672 
673 static DecodeStatus DecodeCtrRegs64RegisterClass(MCInst &Inst, unsigned RegNo,
674  uint64_t /*Address*/,
675  const void *Decoder) {
676  using namespace Hexagon;
677 
678  static const MCPhysReg CtrlReg64DecoderTable[] = {
679  /* 0 */ C1_0, 0, C3_2, 0,
680  /* 4 */ C5_4, 0, C7_6, 0,
681  /* 8 */ C9_8, 0, C11_10, 0,
682  /* 12 */ CS, 0, UPCYCLE, 0,
683  /* 16 */ C17_16, 0, PKTCOUNT, 0,
684  /* 20 */ 0, 0, 0, 0,
685  /* 24 */ 0, 0, 0, 0,
686  /* 28 */ 0, 0, UTIMER, 0
687  };
688 
689  if (RegNo >= array_lengthof(CtrlReg64DecoderTable))
690  return MCDisassembler::Fail;
691 
692  static_assert(NoRegister == 0, "Expecting NoRegister to be 0");
693  if (CtrlReg64DecoderTable[RegNo] == NoRegister)
694  return MCDisassembler::Fail;
695 
696  unsigned Register = CtrlReg64DecoderTable[RegNo];
697  Inst.addOperand(MCOperand::createReg(Register));
698  return MCDisassembler::Success;
699 }
700 
701 static DecodeStatus DecodeModRegsRegisterClass(MCInst &Inst, unsigned RegNo,
702  uint64_t /*Address*/,
703  const void *Decoder) {
704  unsigned Register = 0;
705  switch (RegNo) {
706  case 0:
707  Register = Hexagon::M0;
708  break;
709  case 1:
710  Register = Hexagon::M1;
711  break;
712  default:
713  return MCDisassembler::Fail;
714  }
715  Inst.addOperand(MCOperand::createReg(Register));
716  return MCDisassembler::Success;
717 }
718 
719 static DecodeStatus unsignedImmDecoder(MCInst &MI, unsigned tmp,
720  uint64_t /*Address*/,
721  const void *Decoder) {
722  HexagonDisassembler const &Disassembler = disassembler(Decoder);
723  int64_t FullValue = fullValue(Disassembler, MI, tmp);
724  assert(FullValue >= 0 && "Negative in unsigned decoder");
725  HexagonMCInstrInfo::addConstant(MI, FullValue, Disassembler.getContext());
726  return MCDisassembler::Success;
727 }
728 
729 static DecodeStatus s32_0ImmDecoder(MCInst &MI, unsigned tmp,
730  uint64_t /*Address*/, const void *Decoder) {
731  HexagonDisassembler const &Disassembler = disassembler(Decoder);
732  unsigned Bits = HexagonMCInstrInfo::getExtentBits(*Disassembler.MCII, MI);
733  tmp = SignExtend64(tmp, Bits);
734  signedDecoder<32>(MI, tmp, Decoder);
735  return MCDisassembler::Success;
736 }
737 
738 // custom decoder for various jump/call immediates
739 static DecodeStatus brtargetDecoder(MCInst &MI, unsigned tmp, uint64_t Address,
740  const void *Decoder) {
741  HexagonDisassembler const &Disassembler = disassembler(Decoder);
742  unsigned Bits = HexagonMCInstrInfo::getExtentBits(*Disassembler.MCII, MI);
743  // r13_2 is not extendable, so if there are no extent bits, it's r13_2
744  if (Bits == 0)
745  Bits = 15;
746  uint64_t FullValue = fullValue(Disassembler, MI, SignExtend64(tmp, Bits));
747  uint32_t Extended = FullValue + Address;
748  if (!Disassembler.tryAddingSymbolicOperand(MI, Extended, Address, true, 0, 4))
749  HexagonMCInstrInfo::addConstant(MI, Extended, Disassembler.getContext());
750  return MCDisassembler::Success;
751 }
752 
753 static DecodeStatus DecodeGuestRegsRegisterClass(MCInst &Inst, unsigned RegNo,
754  uint64_t /*Address*/,
755  const void *Decoder) {
756  using namespace Hexagon;
757 
758  static const MCPhysReg GuestRegDecoderTable[] = {
759  /* 0 */ GELR, GSR, GOSP, G3,
760  /* 4 */ G4, G5, G6, G7,
761  /* 8 */ G8, G9, G10, G11,
762  /* 12 */ G12, G13, G14, G15,
763  /* 16 */ GPMUCNT4, GPMUCNT5, GPMUCNT6, GPMUCNT7,
764  /* 20 */ G20, G21, G22, G23,
765  /* 24 */ GPCYCLELO, GPCYCLEHI, GPMUCNT0, GPMUCNT1,
766  /* 28 */ GPMUCNT2, GPMUCNT3, G30, G31
767  };
768 
769  if (RegNo >= array_lengthof(GuestRegDecoderTable))
770  return MCDisassembler::Fail;
771  if (GuestRegDecoderTable[RegNo] == Hexagon::NoRegister)
772  return MCDisassembler::Fail;
773 
774  unsigned Register = GuestRegDecoderTable[RegNo];
775  Inst.addOperand(MCOperand::createReg(Register));
776  return MCDisassembler::Success;
777 }
778 
779 static DecodeStatus DecodeGuestRegs64RegisterClass(MCInst &Inst, unsigned RegNo,
780  uint64_t /*Address*/,
781  const void *Decoder) {
782  using namespace Hexagon;
783 
784  static const MCPhysReg GuestReg64DecoderTable[] = {
785  /* 0 */ G1_0, 0, G3_2, 0,
786  /* 4 */ G5_4, 0, G7_6, 0,
787  /* 8 */ G9_8, 0, G11_10, 0,
788  /* 12 */ G13_12, 0, G15_14, 0,
789  /* 16 */ G17_16, 0, G19_18, 0,
790  /* 20 */ G21_20, 0, G23_22, 0,
791  /* 24 */ G25_24, 0, G27_26, 0,
792  /* 28 */ G29_28, 0, G31_30, 0
793  };
794 
795  if (RegNo >= array_lengthof(GuestReg64DecoderTable))
796  return MCDisassembler::Fail;
797  if (GuestReg64DecoderTable[RegNo] == Hexagon::NoRegister)
798  return MCDisassembler::Fail;
799 
800  unsigned Register = GuestReg64DecoderTable[RegNo];
801  Inst.addOperand(MCOperand::createReg(Register));
802  return MCDisassembler::Success;
803 }
createHexagonDisassembler
static MCDisassembler * createHexagonDisassembler(const Target &T, const MCSubtargetInfo &STI, MCContext &Ctx)
Definition: HexagonDisassembler.cpp:155
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DecodeStatus
Ternary decode status.
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Definition: MCInst.h:161
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An unsigned integer type large enough to represent all physical registers, but not necessarily virtua...
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Definition: HexagonMCInstrInfo.cpp:304
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Definition: MCInst.h:35
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Definition: MCInst.h:123
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Definition: HexagonMCInstrInfo.cpp:83
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Definition: HexagonMCInstrInfo.cpp:310
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