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XCoreDisassembler.cpp
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1 //===- XCoreDisassembler.cpp - Disassembler for XCore -----------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 ///
9 /// \file
10 /// This file is part of the XCore Disassembler.
11 ///
12 //===----------------------------------------------------------------------===//
13 
14 #include "TargetInfo/XCoreTargetInfo.h"
15 #include "XCore.h"
16 #include "XCoreRegisterInfo.h"
17 #include "llvm/MC/MCContext.h"
18 #include "llvm/MC/MCDecoderOps.h"
19 #include "llvm/MC/MCDisassembler/MCDisassembler.h"
20 #include "llvm/MC/MCInst.h"
21 #include "llvm/MC/MCSubtargetInfo.h"
22 #include "llvm/MC/TargetRegistry.h"
23 
24 using namespace llvm;
25 
26 #define DEBUG_TYPE "xcore-disassembler"
27 
28 typedef MCDisassembler::DecodeStatus DecodeStatus;
29 
30 namespace {
31 
32 /// A disassembler class for XCore.
33 class XCoreDisassembler : public MCDisassembler {
34 public:
35  XCoreDisassembler(const MCSubtargetInfo &STI, MCContext &Ctx) :
36  MCDisassembler(STI, Ctx) {}
37 
38  DecodeStatus getInstruction(MCInst &Instr, uint64_t &Size,
39  ArrayRef<uint8_t> Bytes, uint64_t Address,
40  raw_ostream &CStream) const override;
41 };
42 }
43 
44 static bool readInstruction16(ArrayRef<uint8_t> Bytes, uint64_t Address,
45  uint64_t &Size, uint16_t &Insn) {
46  // We want to read exactly 2 Bytes of data.
47  if (Bytes.size() < 2) {
48  Size = 0;
49  return false;
50  }
51  // Encoded as a little-endian 16-bit word in the stream.
52  Insn = (Bytes[0] << 0) | (Bytes[1] << 8);
53  return true;
54 }
55 
56 static bool readInstruction32(ArrayRef<uint8_t> Bytes, uint64_t Address,
57  uint64_t &Size, uint32_t &Insn) {
58  // We want to read exactly 4 Bytes of data.
59  if (Bytes.size() < 4) {
60  Size = 0;
61  return false;
62  }
63  // Encoded as a little-endian 32-bit word in the stream.
64  Insn =
65  (Bytes[0] << 0) | (Bytes[1] << 8) | (Bytes[2] << 16) | (Bytes[3] << 24);
66  return true;
67 }
68 
69 static unsigned getReg(const MCDisassembler *D, unsigned RC, unsigned RegNo) {
70  const MCRegisterInfo *RegInfo = D->getContext().getRegisterInfo();
71  return *(RegInfo->getRegClass(RC).begin() + RegNo);
72 }
73 
74 static DecodeStatus DecodeGRRegsRegisterClass(MCInst &Inst, unsigned RegNo,
75  uint64_t Address,
76  const MCDisassembler *Decoder);
77 
78 static DecodeStatus DecodeRRegsRegisterClass(MCInst &Inst, unsigned RegNo,
79  uint64_t Address,
80  const MCDisassembler *Decoder);
81 
82 static DecodeStatus DecodeBitpOperand(MCInst &Inst, unsigned Val,
83  uint64_t Address,
84  const MCDisassembler *Decoder);
85 
86 static DecodeStatus DecodeNegImmOperand(MCInst &Inst, unsigned Val,
87  uint64_t Address,
88  const MCDisassembler *Decoder);
89 
90 static DecodeStatus Decode2RInstruction(MCInst &Inst, unsigned Insn,
91  uint64_t Address,
92  const MCDisassembler *Decoder);
93 
94 static DecodeStatus Decode2RImmInstruction(MCInst &Inst, unsigned Insn,
95  uint64_t Address,
96  const MCDisassembler *Decoder);
97 
98 static DecodeStatus DecodeR2RInstruction(MCInst &Inst, unsigned Insn,
99  uint64_t Address,
100  const MCDisassembler *Decoder);
101 
102 static DecodeStatus Decode2RSrcDstInstruction(MCInst &Inst, unsigned Insn,
103  uint64_t Address,
104  const MCDisassembler *Decoder);
105 
106 static DecodeStatus DecodeRUSInstruction(MCInst &Inst, unsigned Insn,
107  uint64_t Address,
108  const MCDisassembler *Decoder);
109 
110 static DecodeStatus DecodeRUSBitpInstruction(MCInst &Inst, unsigned Insn,
111  uint64_t Address,
112  const MCDisassembler *Decoder);
113 
114 static DecodeStatus
115 DecodeRUSSrcDstBitpInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
116  const MCDisassembler *Decoder);
117 
118 static DecodeStatus DecodeL2RInstruction(MCInst &Inst, unsigned Insn,
119  uint64_t Address,
120  const MCDisassembler *Decoder);
121 
122 static DecodeStatus DecodeLR2RInstruction(MCInst &Inst, unsigned Insn,
123  uint64_t Address,
124  const MCDisassembler *Decoder);
125 
126 static DecodeStatus Decode3RInstruction(MCInst &Inst, unsigned Insn,
127  uint64_t Address,
128  const MCDisassembler *Decoder);
129 
130 static DecodeStatus Decode3RImmInstruction(MCInst &Inst, unsigned Insn,
131  uint64_t Address,
132  const MCDisassembler *Decoder);
133 
134 static DecodeStatus Decode2RUSInstruction(MCInst &Inst, unsigned Insn,
135  uint64_t Address,
136  const MCDisassembler *Decoder);
137 
138 static DecodeStatus Decode2RUSBitpInstruction(MCInst &Inst, unsigned Insn,
139  uint64_t Address,
140  const MCDisassembler *Decoder);
141 
142 static DecodeStatus DecodeL3RInstruction(MCInst &Inst, unsigned Insn,
143  uint64_t Address,
144  const MCDisassembler *Decoder);
145 
146 static DecodeStatus DecodeL3RSrcDstInstruction(MCInst &Inst, unsigned Insn,
147  uint64_t Address,
148  const MCDisassembler *Decoder);
149 
150 static DecodeStatus DecodeL2RUSInstruction(MCInst &Inst, unsigned Insn,
151  uint64_t Address,
152  const MCDisassembler *Decoder);
153 
154 static DecodeStatus DecodeL2RUSBitpInstruction(MCInst &Inst, unsigned Insn,
155  uint64_t Address,
156  const MCDisassembler *Decoder);
157 
158 static DecodeStatus DecodeL6RInstruction(MCInst &Inst, unsigned Insn,
159  uint64_t Address,
160  const MCDisassembler *Decoder);
161 
162 static DecodeStatus DecodeL5RInstruction(MCInst &Inst, unsigned Insn,
163  uint64_t Address,
164  const MCDisassembler *Decoder);
165 
166 static DecodeStatus DecodeL4RSrcDstInstruction(MCInst &Inst, unsigned Insn,
167  uint64_t Address,
168  const MCDisassembler *Decoder);
169 
170 static DecodeStatus
171 DecodeL4RSrcDstSrcDstInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
172  const MCDisassembler *Decoder);
173 
174 #include "XCoreGenDisassemblerTables.inc"
175 
176 static DecodeStatus DecodeGRRegsRegisterClass(MCInst &Inst, unsigned RegNo,
177  uint64_t Address,
178  const MCDisassembler *Decoder) {
179  if (RegNo > 11)
180  return MCDisassembler::Fail;
181  unsigned Reg = getReg(Decoder, XCore::GRRegsRegClassID, RegNo);
182  Inst.addOperand(MCOperand::createReg(Reg));
183  return MCDisassembler::Success;
184 }
185 
186 static DecodeStatus DecodeRRegsRegisterClass(MCInst &Inst, unsigned RegNo,
187  uint64_t Address,
188  const MCDisassembler *Decoder) {
189  if (RegNo > 15)
190  return MCDisassembler::Fail;
191  unsigned Reg = getReg(Decoder, XCore::RRegsRegClassID, RegNo);
192  Inst.addOperand(MCOperand::createReg(Reg));
193  return MCDisassembler::Success;
194 }
195 
196 static DecodeStatus DecodeBitpOperand(MCInst &Inst, unsigned Val,
197  uint64_t Address,
198  const MCDisassembler *Decoder) {
199  if (Val > 11)
200  return MCDisassembler::Fail;
201  static const unsigned Values[] = {
202  32 /*bpw*/, 1, 2, 3, 4, 5, 6, 7, 8, 16, 24, 32
203  };
204  Inst.addOperand(MCOperand::createImm(Values[Val]));
205  return MCDisassembler::Success;
206 }
207 
208 static DecodeStatus DecodeNegImmOperand(MCInst &Inst, unsigned Val,
209  uint64_t Address,
210  const MCDisassembler *Decoder) {
211  Inst.addOperand(MCOperand::createImm(-(int64_t)Val));
212  return MCDisassembler::Success;
213 }
214 
215 static DecodeStatus
216 Decode2OpInstruction(unsigned Insn, unsigned &Op1, unsigned &Op2) {
217  unsigned Combined = fieldFromInstruction(Insn, 6, 5);
218  if (Combined < 27)
219  return MCDisassembler::Fail;
220  if (fieldFromInstruction(Insn, 5, 1)) {
221  if (Combined == 31)
222  return MCDisassembler::Fail;
223  Combined += 5;
224  }
225  Combined -= 27;
226  unsigned Op1High = Combined % 3;
227  unsigned Op2High = Combined / 3;
228  Op1 = (Op1High << 2) | fieldFromInstruction(Insn, 2, 2);
229  Op2 = (Op2High << 2) | fieldFromInstruction(Insn, 0, 2);
230  return MCDisassembler::Success;
231 }
232 
233 static DecodeStatus
234 Decode3OpInstruction(unsigned Insn, unsigned &Op1, unsigned &Op2,
235  unsigned &Op3) {
236  unsigned Combined = fieldFromInstruction(Insn, 6, 5);
237  if (Combined >= 27)
238  return MCDisassembler::Fail;
239 
240  unsigned Op1High = Combined % 3;
241  unsigned Op2High = (Combined / 3) % 3;
242  unsigned Op3High = Combined / 9;
243  Op1 = (Op1High << 2) | fieldFromInstruction(Insn, 4, 2);
244  Op2 = (Op2High << 2) | fieldFromInstruction(Insn, 2, 2);
245  Op3 = (Op3High << 2) | fieldFromInstruction(Insn, 0, 2);
246  return MCDisassembler::Success;
247 }
248 
249 static DecodeStatus Decode2OpInstructionFail(MCInst &Inst, unsigned Insn,
250  uint64_t Address,
251  const MCDisassembler *Decoder) {
252  // Try and decode as a 3R instruction.
253  unsigned Opcode = fieldFromInstruction(Insn, 11, 5);
254  switch (Opcode) {
255  case 0x0:
256  Inst.setOpcode(XCore::STW_2rus);
257  return Decode2RUSInstruction(Inst, Insn, Address, Decoder);
258  case 0x1:
259  Inst.setOpcode(XCore::LDW_2rus);
260  return Decode2RUSInstruction(Inst, Insn, Address, Decoder);
261  case 0x2:
262  Inst.setOpcode(XCore::ADD_3r);
263  return Decode3RInstruction(Inst, Insn, Address, Decoder);
264  case 0x3:
265  Inst.setOpcode(XCore::SUB_3r);
266  return Decode3RInstruction(Inst, Insn, Address, Decoder);
267  case 0x4:
268  Inst.setOpcode(XCore::SHL_3r);
269  return Decode3RInstruction(Inst, Insn, Address, Decoder);
270  case 0x5:
271  Inst.setOpcode(XCore::SHR_3r);
272  return Decode3RInstruction(Inst, Insn, Address, Decoder);
273  case 0x6:
274  Inst.setOpcode(XCore::EQ_3r);
275  return Decode3RInstruction(Inst, Insn, Address, Decoder);
276  case 0x7:
277  Inst.setOpcode(XCore::AND_3r);
278  return Decode3RInstruction(Inst, Insn, Address, Decoder);
279  case 0x8:
280  Inst.setOpcode(XCore::OR_3r);
281  return Decode3RInstruction(Inst, Insn, Address, Decoder);
282  case 0x9:
283  Inst.setOpcode(XCore::LDW_3r);
284  return Decode3RInstruction(Inst, Insn, Address, Decoder);
285  case 0x10:
286  Inst.setOpcode(XCore::LD16S_3r);
287  return Decode3RInstruction(Inst, Insn, Address, Decoder);
288  case 0x11:
289  Inst.setOpcode(XCore::LD8U_3r);
290  return Decode3RInstruction(Inst, Insn, Address, Decoder);
291  case 0x12:
292  Inst.setOpcode(XCore::ADD_2rus);
293  return Decode2RUSInstruction(Inst, Insn, Address, Decoder);
294  case 0x13:
295  Inst.setOpcode(XCore::SUB_2rus);
296  return Decode2RUSInstruction(Inst, Insn, Address, Decoder);
297  case 0x14:
298  Inst.setOpcode(XCore::SHL_2rus);
299  return Decode2RUSBitpInstruction(Inst, Insn, Address, Decoder);
300  case 0x15:
301  Inst.setOpcode(XCore::SHR_2rus);
302  return Decode2RUSBitpInstruction(Inst, Insn, Address, Decoder);
303  case 0x16:
304  Inst.setOpcode(XCore::EQ_2rus);
305  return Decode2RUSInstruction(Inst, Insn, Address, Decoder);
306  case 0x17:
307  Inst.setOpcode(XCore::TSETR_3r);
308  return Decode3RImmInstruction(Inst, Insn, Address, Decoder);
309  case 0x18:
310  Inst.setOpcode(XCore::LSS_3r);
311  return Decode3RInstruction(Inst, Insn, Address, Decoder);
312  case 0x19:
313  Inst.setOpcode(XCore::LSU_3r);
314  return Decode3RInstruction(Inst, Insn, Address, Decoder);
315  }
316  return MCDisassembler::Fail;
317 }
318 
319 static DecodeStatus Decode2RInstruction(MCInst &Inst, unsigned Insn,
320  uint64_t Address,
321  const MCDisassembler *Decoder) {
322  unsigned Op1, Op2;
323  DecodeStatus S = Decode2OpInstruction(Insn, Op1, Op2);
324  if (S != MCDisassembler::Success)
325  return Decode2OpInstructionFail(Inst, Insn, Address, Decoder);
326 
327  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
328  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
329  return S;
330 }
331 
332 static DecodeStatus Decode2RImmInstruction(MCInst &Inst, unsigned Insn,
333  uint64_t Address,
334  const MCDisassembler *Decoder) {
335  unsigned Op1, Op2;
336  DecodeStatus S = Decode2OpInstruction(Insn, Op1, Op2);
337  if (S != MCDisassembler::Success)
338  return Decode2OpInstructionFail(Inst, Insn, Address, Decoder);
339 
340  Inst.addOperand(MCOperand::createImm(Op1));
341  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
342  return S;
343 }
344 
345 static DecodeStatus DecodeR2RInstruction(MCInst &Inst, unsigned Insn,
346  uint64_t Address,
347  const MCDisassembler *Decoder) {
348  unsigned Op1, Op2;
349  DecodeStatus S = Decode2OpInstruction(Insn, Op2, Op1);
350  if (S != MCDisassembler::Success)
351  return Decode2OpInstructionFail(Inst, Insn, Address, Decoder);
352 
353  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
354  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
355  return S;
356 }
357 
358 static DecodeStatus Decode2RSrcDstInstruction(MCInst &Inst, unsigned Insn,
359  uint64_t Address,
360  const MCDisassembler *Decoder) {
361  unsigned Op1, Op2;
362  DecodeStatus S = Decode2OpInstruction(Insn, Op1, Op2);
363  if (S != MCDisassembler::Success)
364  return Decode2OpInstructionFail(Inst, Insn, Address, Decoder);
365 
366  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
367  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
368  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
369  return S;
370 }
371 
372 static DecodeStatus DecodeRUSInstruction(MCInst &Inst, unsigned Insn,
373  uint64_t Address,
374  const MCDisassembler *Decoder) {
375  unsigned Op1, Op2;
376  DecodeStatus S = Decode2OpInstruction(Insn, Op1, Op2);
377  if (S != MCDisassembler::Success)
378  return Decode2OpInstructionFail(Inst, Insn, Address, Decoder);
379 
380  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
381  Inst.addOperand(MCOperand::createImm(Op2));
382  return S;
383 }
384 
385 static DecodeStatus DecodeRUSBitpInstruction(MCInst &Inst, unsigned Insn,
386  uint64_t Address,
387  const MCDisassembler *Decoder) {
388  unsigned Op1, Op2;
389  DecodeStatus S = Decode2OpInstruction(Insn, Op1, Op2);
390  if (S != MCDisassembler::Success)
391  return Decode2OpInstructionFail(Inst, Insn, Address, Decoder);
392 
393  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
394  DecodeBitpOperand(Inst, Op2, Address, Decoder);
395  return S;
396 }
397 
398 static DecodeStatus
399 DecodeRUSSrcDstBitpInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
400  const MCDisassembler *Decoder) {
401  unsigned Op1, Op2;
402  DecodeStatus S = Decode2OpInstruction(Insn, Op1, Op2);
403  if (S != MCDisassembler::Success)
404  return Decode2OpInstructionFail(Inst, Insn, Address, Decoder);
405 
406  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
407  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
408  DecodeBitpOperand(Inst, Op2, Address, Decoder);
409  return S;
410 }
411 
412 static DecodeStatus DecodeL2OpInstructionFail(MCInst &Inst, unsigned Insn,
413  uint64_t Address,
414  const MCDisassembler *Decoder) {
415  // Try and decode as a L3R / L2RUS instruction.
416  unsigned Opcode = fieldFromInstruction(Insn, 16, 4) |
417  fieldFromInstruction(Insn, 27, 5) << 4;
418  switch (Opcode) {
419  case 0x0c:
420  Inst.setOpcode(XCore::STW_l3r);
421  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
422  case 0x1c:
423  Inst.setOpcode(XCore::XOR_l3r);
424  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
425  case 0x2c:
426  Inst.setOpcode(XCore::ASHR_l3r);
427  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
428  case 0x3c:
429  Inst.setOpcode(XCore::LDAWF_l3r);
430  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
431  case 0x4c:
432  Inst.setOpcode(XCore::LDAWB_l3r);
433  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
434  case 0x5c:
435  Inst.setOpcode(XCore::LDA16F_l3r);
436  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
437  case 0x6c:
438  Inst.setOpcode(XCore::LDA16B_l3r);
439  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
440  case 0x7c:
441  Inst.setOpcode(XCore::MUL_l3r);
442  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
443  case 0x8c:
444  Inst.setOpcode(XCore::DIVS_l3r);
445  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
446  case 0x9c:
447  Inst.setOpcode(XCore::DIVU_l3r);
448  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
449  case 0x10c:
450  Inst.setOpcode(XCore::ST16_l3r);
451  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
452  case 0x11c:
453  Inst.setOpcode(XCore::ST8_l3r);
454  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
455  case 0x12c:
456  Inst.setOpcode(XCore::ASHR_l2rus);
457  return DecodeL2RUSBitpInstruction(Inst, Insn, Address, Decoder);
458  case 0x12d:
459  Inst.setOpcode(XCore::OUTPW_l2rus);
460  return DecodeL2RUSBitpInstruction(Inst, Insn, Address, Decoder);
461  case 0x12e:
462  Inst.setOpcode(XCore::INPW_l2rus);
463  return DecodeL2RUSBitpInstruction(Inst, Insn, Address, Decoder);
464  case 0x13c:
465  Inst.setOpcode(XCore::LDAWF_l2rus);
466  return DecodeL2RUSInstruction(Inst, Insn, Address, Decoder);
467  case 0x14c:
468  Inst.setOpcode(XCore::LDAWB_l2rus);
469  return DecodeL2RUSInstruction(Inst, Insn, Address, Decoder);
470  case 0x15c:
471  Inst.setOpcode(XCore::CRC_l3r);
472  return DecodeL3RSrcDstInstruction(Inst, Insn, Address, Decoder);
473  case 0x18c:
474  Inst.setOpcode(XCore::REMS_l3r);
475  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
476  case 0x19c:
477  Inst.setOpcode(XCore::REMU_l3r);
478  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
479  }
480  return MCDisassembler::Fail;
481 }
482 
483 static DecodeStatus DecodeL2RInstruction(MCInst &Inst, unsigned Insn,
484  uint64_t Address,
485  const MCDisassembler *Decoder) {
486  unsigned Op1, Op2;
487  DecodeStatus S = Decode2OpInstruction(fieldFromInstruction(Insn, 0, 16),
488  Op1, Op2);
489  if (S != MCDisassembler::Success)
490  return DecodeL2OpInstructionFail(Inst, Insn, Address, Decoder);
491 
492  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
493  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
494  return S;
495 }
496 
497 static DecodeStatus DecodeLR2RInstruction(MCInst &Inst, unsigned Insn,
498  uint64_t Address,
499  const MCDisassembler *Decoder) {
500  unsigned Op1, Op2;
501  DecodeStatus S = Decode2OpInstruction(fieldFromInstruction(Insn, 0, 16),
502  Op1, Op2);
503  if (S != MCDisassembler::Success)
504  return DecodeL2OpInstructionFail(Inst, Insn, Address, Decoder);
505 
506  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
507  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
508  return S;
509 }
510 
511 static DecodeStatus Decode3RInstruction(MCInst &Inst, unsigned Insn,
512  uint64_t Address,
513  const MCDisassembler *Decoder) {
514  unsigned Op1, Op2, Op3;
515  DecodeStatus S = Decode3OpInstruction(Insn, Op1, Op2, Op3);
516  if (S == MCDisassembler::Success) {
517  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
518  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
519  DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
520  }
521  return S;
522 }
523 
524 static DecodeStatus Decode3RImmInstruction(MCInst &Inst, unsigned Insn,
525  uint64_t Address,
526  const MCDisassembler *Decoder) {
527  unsigned Op1, Op2, Op3;
528  DecodeStatus S = Decode3OpInstruction(Insn, Op1, Op2, Op3);
529  if (S == MCDisassembler::Success) {
530  Inst.addOperand(MCOperand::createImm(Op1));
531  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
532  DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
533  }
534  return S;
535 }
536 
537 static DecodeStatus Decode2RUSInstruction(MCInst &Inst, unsigned Insn,
538  uint64_t Address,
539  const MCDisassembler *Decoder) {
540  unsigned Op1, Op2, Op3;
541  DecodeStatus S = Decode3OpInstruction(Insn, Op1, Op2, Op3);
542  if (S == MCDisassembler::Success) {
543  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
544  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
545  Inst.addOperand(MCOperand::createImm(Op3));
546  }
547  return S;
548 }
549 
550 static DecodeStatus Decode2RUSBitpInstruction(MCInst &Inst, unsigned Insn,
551  uint64_t Address,
552  const MCDisassembler *Decoder) {
553  unsigned Op1, Op2, Op3;
554  DecodeStatus S = Decode3OpInstruction(Insn, Op1, Op2, Op3);
555  if (S == MCDisassembler::Success) {
556  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
557  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
558  DecodeBitpOperand(Inst, Op3, Address, Decoder);
559  }
560  return S;
561 }
562 
563 static DecodeStatus DecodeL3RInstruction(MCInst &Inst, unsigned Insn,
564  uint64_t Address,
565  const MCDisassembler *Decoder) {
566  unsigned Op1, Op2, Op3;
567  DecodeStatus S =
568  Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
569  if (S == MCDisassembler::Success) {
570  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
571  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
572  DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
573  }
574  return S;
575 }
576 
577 static DecodeStatus DecodeL3RSrcDstInstruction(MCInst &Inst, unsigned Insn,
578  uint64_t Address,
579  const MCDisassembler *Decoder) {
580  unsigned Op1, Op2, Op3;
581  DecodeStatus S =
582  Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
583  if (S == MCDisassembler::Success) {
584  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
585  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
586  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
587  DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
588  }
589  return S;
590 }
591 
592 static DecodeStatus DecodeL2RUSInstruction(MCInst &Inst, unsigned Insn,
593  uint64_t Address,
594  const MCDisassembler *Decoder) {
595  unsigned Op1, Op2, Op3;
596  DecodeStatus S =
597  Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
598  if (S == MCDisassembler::Success) {
599  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
600  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
601  Inst.addOperand(MCOperand::createImm(Op3));
602  }
603  return S;
604 }
605 
606 static DecodeStatus DecodeL2RUSBitpInstruction(MCInst &Inst, unsigned Insn,
607  uint64_t Address,
608  const MCDisassembler *Decoder) {
609  unsigned Op1, Op2, Op3;
610  DecodeStatus S =
611  Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
612  if (S == MCDisassembler::Success) {
613  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
614  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
615  DecodeBitpOperand(Inst, Op3, Address, Decoder);
616  }
617  return S;
618 }
619 
620 static DecodeStatus DecodeL6RInstruction(MCInst &Inst, unsigned Insn,
621  uint64_t Address,
622  const MCDisassembler *Decoder) {
623  unsigned Op1, Op2, Op3, Op4, Op5, Op6;
624  DecodeStatus S =
625  Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
626  if (S != MCDisassembler::Success)
627  return S;
628  S = Decode3OpInstruction(fieldFromInstruction(Insn, 16, 16), Op4, Op5, Op6);
629  if (S != MCDisassembler::Success)
630  return S;
631  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
632  DecodeGRRegsRegisterClass(Inst, Op4, Address, Decoder);
633  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
634  DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
635  DecodeGRRegsRegisterClass(Inst, Op5, Address, Decoder);
636  DecodeGRRegsRegisterClass(Inst, Op6, Address, Decoder);
637  return S;
638 }
639 
640 static DecodeStatus DecodeL5RInstructionFail(MCInst &Inst, unsigned Insn,
641  uint64_t Address,
642  const MCDisassembler *Decoder) {
643  // Try and decode as a L6R instruction.
644  Inst.clear();
645  unsigned Opcode = fieldFromInstruction(Insn, 27, 5);
646  switch (Opcode) {
647  case 0x00:
648  Inst.setOpcode(XCore::LMUL_l6r);
649  return DecodeL6RInstruction(Inst, Insn, Address, Decoder);
650  }
651  return MCDisassembler::Fail;
652 }
653 
654 static DecodeStatus DecodeL5RInstruction(MCInst &Inst, unsigned Insn,
655  uint64_t Address,
656  const MCDisassembler *Decoder) {
657  unsigned Op1, Op2, Op3, Op4, Op5;
658  DecodeStatus S =
659  Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
660  if (S != MCDisassembler::Success)
661  return DecodeL5RInstructionFail(Inst, Insn, Address, Decoder);
662  S = Decode2OpInstruction(fieldFromInstruction(Insn, 16, 16), Op4, Op5);
663  if (S != MCDisassembler::Success)
664  return DecodeL5RInstructionFail(Inst, Insn, Address, Decoder);
665 
666  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
667  DecodeGRRegsRegisterClass(Inst, Op4, Address, Decoder);
668  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
669  DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
670  DecodeGRRegsRegisterClass(Inst, Op5, Address, Decoder);
671  return S;
672 }
673 
674 static DecodeStatus DecodeL4RSrcDstInstruction(MCInst &Inst, unsigned Insn,
675  uint64_t Address,
676  const MCDisassembler *Decoder) {
677  unsigned Op1, Op2, Op3;
678  unsigned Op4 = fieldFromInstruction(Insn, 16, 4);
679  DecodeStatus S =
680  Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
681  if (S == MCDisassembler::Success) {
682  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
683  S = DecodeGRRegsRegisterClass(Inst, Op4, Address, Decoder);
684  }
685  if (S == MCDisassembler::Success) {
686  DecodeGRRegsRegisterClass(Inst, Op4, Address, Decoder);
687  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
688  DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
689  }
690  return S;
691 }
692 
693 static DecodeStatus
694 DecodeL4RSrcDstSrcDstInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
695  const MCDisassembler *Decoder) {
696  unsigned Op1, Op2, Op3;
697  unsigned Op4 = fieldFromInstruction(Insn, 16, 4);
698  DecodeStatus S =
699  Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
700  if (S == MCDisassembler::Success) {
701  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
702  S = DecodeGRRegsRegisterClass(Inst, Op4, Address, Decoder);
703  }
704  if (S == MCDisassembler::Success) {
705  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
706  DecodeGRRegsRegisterClass(Inst, Op4, Address, Decoder);
707  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
708  DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
709  }
710  return S;
711 }
712 
713 MCDisassembler::DecodeStatus
714 XCoreDisassembler::getInstruction(MCInst &instr, uint64_t &Size,
715  ArrayRef<uint8_t> Bytes, uint64_t Address,
716  raw_ostream &cStream) const {
717  uint16_t insn16;
718 
719  if (!readInstruction16(Bytes, Address, Size, insn16)) {
720  return Fail;
721  }
722 
723  // Calling the auto-generated decoder function.
724  DecodeStatus Result = decodeInstruction(DecoderTable16, instr, insn16,
725  Address, this, STI);
726  if (Result != Fail) {
727  Size = 2;
728  return Result;
729  }
730 
731  uint32_t insn32;
732 
733  if (!readInstruction32(Bytes, Address, Size, insn32)) {
734  return Fail;
735  }
736 
737  // Calling the auto-generated decoder function.
738  Result = decodeInstruction(DecoderTable32, instr, insn32, Address, this, STI);
739  if (Result != Fail) {
740  Size = 4;
741  return Result;
742  }
743 
744  return Fail;
745 }
746 
747 static MCDisassembler *createXCoreDisassembler(const Target &T,
748  const MCSubtargetInfo &STI,
749  MCContext &Ctx) {
750  return new XCoreDisassembler(STI, Ctx);
751 }
752 
753 extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeXCoreDisassembler() {
754  // Register the disassembler.
755  TargetRegistry::RegisterMCDisassembler(getTheXCoreTarget(),
756  createXCoreDisassembler);
757 }
llvm::Check::Size
@ Size
Definition: FileCheck.h:76
XCoreRegisterInfo.h
llvm
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:17
DecodeRUSInstruction
static DecodeStatus DecodeRUSInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:372
MCDisassembler.h
T
llvm::MCOperand::createImm
static MCOperand createImm(int64_t Val)
Definition: MCInst.h:141
llvm::MCContext
Context object for machine code objects.
Definition: MCContext.h:74
DecodeL3RInstruction
static DecodeStatus DecodeL3RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:563
XCore.h
llvm::Target
Target - Wrapper for Target specific information.
Definition: TargetRegistry.h:140
Decode2RUSInstruction
static DecodeStatus Decode2RUSInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:537
Decode3OpInstruction
static DecodeStatus Decode3OpInstruction(unsigned Insn, unsigned &Op1, unsigned &Op2, unsigned &Op3)
Definition: XCoreDisassembler.cpp:234
llvm::X86Disassembler::Reg
Reg
All possible values of the reg field in the ModR/M byte.
Definition: X86DisassemblerDecoder.h:462
Fail
#define Fail
Definition: AArch64Disassembler.cpp:281
LLVMInitializeXCoreDisassembler
LLVM_EXTERNAL_VISIBILITY void LLVMInitializeXCoreDisassembler()
Definition: XCoreDisassembler.cpp:753
DecodeR2RInstruction
static DecodeStatus DecodeR2RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:345
llvm::TargetRegistry::RegisterMCDisassembler
static void RegisterMCDisassembler(Target &T, Target::MCDisassemblerCtorTy Fn)
RegisterMCDisassembler - Register a MCDisassembler implementation for the given target.
Definition: TargetRegistry.h:933
DecodeL5RInstructionFail
static DecodeStatus DecodeL5RInstructionFail(MCInst &Inst, unsigned Insn, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:640
getReg
static unsigned getReg(const MCDisassembler *D, unsigned RC, unsigned RegNo)
Definition: XCoreDisassembler.cpp:69
llvm::MCInst
Instances of this class represent a single low-level machine instruction.
Definition: MCInst.h:184
MCDecoderOps.h
DecodeL4RSrcDstInstruction
static DecodeStatus DecodeL4RSrcDstInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:674
DecodeL5RInstruction
static DecodeStatus DecodeL5RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:654
llvm::MCInst::setOpcode
void setOpcode(unsigned Op)
Definition: MCInst.h:197
DecodeL4RSrcDstSrcDstInstruction
static DecodeStatus DecodeL4RSrcDstSrcDstInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:694
readInstruction32
static bool readInstruction32(ArrayRef< uint8_t > Bytes, uint64_t Address, uint64_t &Size, uint32_t &Insn)
Definition: XCoreDisassembler.cpp:56
llvm::MCRegisterInfo::getRegClass
const MCRegisterClass & getRegClass(unsigned i) const
Returns the register class associated with the enumeration value.
Definition: MCRegisterInfo.h:543
Decode2RSrcDstInstruction
static DecodeStatus Decode2RSrcDstInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:358
DecodeNegImmOperand
static DecodeStatus DecodeNegImmOperand(MCInst &Inst, unsigned Val, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:208
Decode2RInstruction
static DecodeStatus Decode2RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:319
MCContext.h
Decode2RUSBitpInstruction
static DecodeStatus Decode2RUSBitpInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:550
createXCoreDisassembler
static MCDisassembler * createXCoreDisassembler(const Target &T, const MCSubtargetInfo &STI, MCContext &Ctx)
Definition: XCoreDisassembler.cpp:747
llvm::ms_demangle::QualifierMangleMode::Result
@ Result
llvm::MCDisassembler::Success
@ Success
Definition: MCDisassembler.h:112
Decode3RInstruction
static DecodeStatus Decode3RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:511
MCInst.h
DecodeGRRegsRegisterClass
static DecodeStatus DecodeGRRegsRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:176
DecodeRUSSrcDstBitpInstruction
static DecodeStatus DecodeRUSSrcDstBitpInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:399
MCSubtargetInfo.h
Decode2RImmInstruction
static DecodeStatus Decode2RImmInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:332
llvm::raw_ostream
This class implements an extremely fast bulk output stream that can only output to a stream.
Definition: raw_ostream.h:54
DecodeLR2RInstruction
static DecodeStatus DecodeLR2RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:497
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DecodeStatus
Ternary decode status.
Definition: MCDisassembler.h:109
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void addOperand(const MCOperand Op)
Definition: MCInst.h:210
llvm::MCRegisterClass::begin
iterator begin() const
begin/end - Return all of the registers in this class.
Definition: MCRegisterInfo.h:52
DecodeL2RInstruction
static DecodeStatus DecodeL2RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:483
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Target & getTheXCoreTarget()
Definition: XCoreTargetInfo.cpp:13
uint64_t
D
static GCRegistry::Add< StatepointGC > D("statepoint-example", "an example strategy for statepoint")
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#define LLVM_EXTERNAL_VISIBILITY
Definition: Compiler.h:126
DecodeL6RInstruction
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Definition: XCoreDisassembler.cpp:620
llvm::MCDisassembler
Superclass for all disassemblers.
Definition: MCDisassembler.h:85
DecodeBitpOperand
static DecodeStatus DecodeBitpOperand(MCInst &Inst, unsigned Val, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:196
DecodeL3RSrcDstInstruction
static DecodeStatus DecodeL3RSrcDstInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:577
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llvm::MCOperand::createReg
static MCOperand createReg(unsigned Reg)
Definition: MCInst.h:134
Decode3RImmInstruction
static DecodeStatus Decode3RImmInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:524
uint32_t
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add sub stmia L5 ldr r0 bl L_printf $stub Instead of a and a wouldn t it be better to do three moves *Return an aggregate type is even return S
Definition: README.txt:210
llvm::MCRegisterInfo
MCRegisterInfo base class - We assume that the target defines a static array of MCRegisterDesc object...
Definition: MCRegisterInfo.h:135
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@ Fail
Definition: MCDisassembler.h:110
DecodeStatus
MCDisassembler::DecodeStatus DecodeStatus
Definition: XCoreDisassembler.cpp:28
readInstruction16
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Definition: XCoreDisassembler.cpp:44
DecodeL2RUSBitpInstruction
static DecodeStatus DecodeL2RUSBitpInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:606
Insn
SmallVector< AArch64_IMM::ImmInsnModel, 4 > Insn
Definition: AArch64MIPeepholeOpt.cpp:132
uint16_t
Decode2OpInstructionFail
static DecodeStatus Decode2OpInstructionFail(MCInst &Inst, unsigned Insn, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:249
Decode2OpInstruction
static DecodeStatus Decode2OpInstruction(unsigned Insn, unsigned &Op1, unsigned &Op2)
Definition: XCoreDisassembler.cpp:216
DecodeL2RUSInstruction
static DecodeStatus DecodeL2RUSInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:592
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size_t size() const
size - Get the array size.
Definition: ArrayRef.h:164
DecodeL2OpInstructionFail
static DecodeStatus DecodeL2OpInstructionFail(MCInst &Inst, unsigned Insn, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:412
DecodeRRegsRegisterClass
static DecodeStatus DecodeRRegsRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:186
DecodeRUSBitpInstruction
static DecodeStatus DecodeRUSBitpInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const MCDisassembler *Decoder)
Definition: XCoreDisassembler.cpp:385
XCoreTargetInfo.h
TargetRegistry.h
llvm::MCSubtargetInfo
Generic base class for all target subtargets.
Definition: MCSubtargetInfo.h:76
llvm::MCInst::clear
void clear()
Definition: MCInst.h:215
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