LLVM  8.0.1
XCoreDisassembler.cpp
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1 //===- XCoreDisassembler.cpp - Disassembler for XCore -----------*- C++ -*-===//
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 /// \file
11 /// This file is part of the XCore Disassembler.
12 ///
13 //===----------------------------------------------------------------------===//
14 
15 #include "XCore.h"
16 #include "XCoreRegisterInfo.h"
17 #include "llvm/MC/MCContext.h"
18 #include "llvm/MC/MCDisassembler/MCDisassembler.h"
19 #include "llvm/MC/MCFixedLenDisassembler.h"
20 #include "llvm/MC/MCInst.h"
21 #include "llvm/MC/MCSubtargetInfo.h"
22 #include "llvm/Support/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 &VStream,
41  raw_ostream &CStream) const override;
42 };
43 }
44 
45 static bool readInstruction16(ArrayRef<uint8_t> Bytes, uint64_t Address,
46  uint64_t &Size, uint16_t &Insn) {
47  // We want to read exactly 2 Bytes of data.
48  if (Bytes.size() < 2) {
49  Size = 0;
50  return false;
51  }
52  // Encoded as a little-endian 16-bit word in the stream.
53  Insn = (Bytes[0] << 0) | (Bytes[1] << 8);
54  return true;
55 }
56 
57 static bool readInstruction32(ArrayRef<uint8_t> Bytes, uint64_t Address,
58  uint64_t &Size, uint32_t &Insn) {
59  // We want to read exactly 4 Bytes of data.
60  if (Bytes.size() < 4) {
61  Size = 0;
62  return false;
63  }
64  // Encoded as a little-endian 32-bit word in the stream.
65  Insn =
66  (Bytes[0] << 0) | (Bytes[1] << 8) | (Bytes[2] << 16) | (Bytes[3] << 24);
67  return true;
68 }
69 
70 static unsigned getReg(const void *D, unsigned RC, unsigned RegNo) {
71  const XCoreDisassembler *Dis = static_cast<const XCoreDisassembler*>(D);
72  const MCRegisterInfo *RegInfo = Dis->getContext().getRegisterInfo();
73  return *(RegInfo->getRegClass(RC).begin() + RegNo);
74 }
75 
76 static DecodeStatus DecodeGRRegsRegisterClass(MCInst &Inst,
77  unsigned RegNo,
78  uint64_t Address,
79  const void *Decoder);
80 
81 static DecodeStatus DecodeRRegsRegisterClass(MCInst &Inst,
82  unsigned RegNo,
83  uint64_t Address,
84  const void *Decoder);
85 
86 static DecodeStatus DecodeBitpOperand(MCInst &Inst, unsigned Val,
87  uint64_t Address, const void *Decoder);
88 
89 static DecodeStatus DecodeNegImmOperand(MCInst &Inst, unsigned Val,
90  uint64_t Address, const void *Decoder);
91 
92 static DecodeStatus Decode2RInstruction(MCInst &Inst,
93  unsigned Insn,
94  uint64_t Address,
95  const void *Decoder);
96 
97 static DecodeStatus Decode2RImmInstruction(MCInst &Inst,
98  unsigned Insn,
99  uint64_t Address,
100  const void *Decoder);
101 
102 static DecodeStatus DecodeR2RInstruction(MCInst &Inst,
103  unsigned Insn,
104  uint64_t Address,
105  const void *Decoder);
106 
107 static DecodeStatus Decode2RSrcDstInstruction(MCInst &Inst,
108  unsigned Insn,
109  uint64_t Address,
110  const void *Decoder);
111 
112 static DecodeStatus DecodeRUSInstruction(MCInst &Inst,
113  unsigned Insn,
114  uint64_t Address,
115  const void *Decoder);
116 
117 static DecodeStatus DecodeRUSBitpInstruction(MCInst &Inst,
118  unsigned Insn,
119  uint64_t Address,
120  const void *Decoder);
121 
122 static DecodeStatus DecodeRUSSrcDstBitpInstruction(MCInst &Inst,
123  unsigned Insn,
124  uint64_t Address,
125  const void *Decoder);
126 
127 static DecodeStatus DecodeL2RInstruction(MCInst &Inst,
128  unsigned Insn,
129  uint64_t Address,
130  const void *Decoder);
131 
132 static DecodeStatus DecodeLR2RInstruction(MCInst &Inst,
133  unsigned Insn,
134  uint64_t Address,
135  const void *Decoder);
136 
137 static DecodeStatus Decode3RInstruction(MCInst &Inst,
138  unsigned Insn,
139  uint64_t Address,
140  const void *Decoder);
141 
142 static DecodeStatus Decode3RImmInstruction(MCInst &Inst,
143  unsigned Insn,
144  uint64_t Address,
145  const void *Decoder);
146 
147 static DecodeStatus Decode2RUSInstruction(MCInst &Inst,
148  unsigned Insn,
149  uint64_t Address,
150  const void *Decoder);
151 
152 static DecodeStatus Decode2RUSBitpInstruction(MCInst &Inst,
153  unsigned Insn,
154  uint64_t Address,
155  const void *Decoder);
156 
157 static DecodeStatus DecodeL3RInstruction(MCInst &Inst,
158  unsigned Insn,
159  uint64_t Address,
160  const void *Decoder);
161 
162 static DecodeStatus DecodeL3RSrcDstInstruction(MCInst &Inst,
163  unsigned Insn,
164  uint64_t Address,
165  const void *Decoder);
166 
167 static DecodeStatus DecodeL2RUSInstruction(MCInst &Inst,
168  unsigned Insn,
169  uint64_t Address,
170  const void *Decoder);
171 
172 static DecodeStatus DecodeL2RUSBitpInstruction(MCInst &Inst,
173  unsigned Insn,
174  uint64_t Address,
175  const void *Decoder);
176 
177 static DecodeStatus DecodeL6RInstruction(MCInst &Inst,
178  unsigned Insn,
179  uint64_t Address,
180  const void *Decoder);
181 
182 static DecodeStatus DecodeL5RInstruction(MCInst &Inst,
183  unsigned Insn,
184  uint64_t Address,
185  const void *Decoder);
186 
187 static DecodeStatus DecodeL4RSrcDstInstruction(MCInst &Inst,
188  unsigned Insn,
189  uint64_t Address,
190  const void *Decoder);
191 
192 static DecodeStatus DecodeL4RSrcDstSrcDstInstruction(MCInst &Inst,
193  unsigned Insn,
194  uint64_t Address,
195  const void *Decoder);
196 
197 #include "XCoreGenDisassemblerTables.inc"
198 
199 static DecodeStatus DecodeGRRegsRegisterClass(MCInst &Inst,
200  unsigned RegNo,
201  uint64_t Address,
202  const void *Decoder)
203 {
204  if (RegNo > 11)
205  return MCDisassembler::Fail;
206  unsigned Reg = getReg(Decoder, XCore::GRRegsRegClassID, RegNo);
207  Inst.addOperand(MCOperand::createReg(Reg));
208  return MCDisassembler::Success;
209 }
210 
211 static DecodeStatus DecodeRRegsRegisterClass(MCInst &Inst,
212  unsigned RegNo,
213  uint64_t Address,
214  const void *Decoder)
215 {
216  if (RegNo > 15)
217  return MCDisassembler::Fail;
218  unsigned Reg = getReg(Decoder, XCore::RRegsRegClassID, RegNo);
219  Inst.addOperand(MCOperand::createReg(Reg));
220  return MCDisassembler::Success;
221 }
222 
223 static DecodeStatus DecodeBitpOperand(MCInst &Inst, unsigned Val,
224  uint64_t Address, const void *Decoder) {
225  if (Val > 11)
226  return MCDisassembler::Fail;
227  static const unsigned Values[] = {
228  32 /*bpw*/, 1, 2, 3, 4, 5, 6, 7, 8, 16, 24, 32
229  };
230  Inst.addOperand(MCOperand::createImm(Values[Val]));
231  return MCDisassembler::Success;
232 }
233 
234 static DecodeStatus DecodeNegImmOperand(MCInst &Inst, unsigned Val,
235  uint64_t Address, const void *Decoder) {
236  Inst.addOperand(MCOperand::createImm(-(int64_t)Val));
237  return MCDisassembler::Success;
238 }
239 
240 static DecodeStatus
241 Decode2OpInstruction(unsigned Insn, unsigned &Op1, unsigned &Op2) {
242  unsigned Combined = fieldFromInstruction(Insn, 6, 5);
243  if (Combined < 27)
244  return MCDisassembler::Fail;
245  if (fieldFromInstruction(Insn, 5, 1)) {
246  if (Combined == 31)
247  return MCDisassembler::Fail;
248  Combined += 5;
249  }
250  Combined -= 27;
251  unsigned Op1High = Combined % 3;
252  unsigned Op2High = Combined / 3;
253  Op1 = (Op1High << 2) | fieldFromInstruction(Insn, 2, 2);
254  Op2 = (Op2High << 2) | fieldFromInstruction(Insn, 0, 2);
255  return MCDisassembler::Success;
256 }
257 
258 static DecodeStatus
259 Decode3OpInstruction(unsigned Insn, unsigned &Op1, unsigned &Op2,
260  unsigned &Op3) {
261  unsigned Combined = fieldFromInstruction(Insn, 6, 5);
262  if (Combined >= 27)
263  return MCDisassembler::Fail;
264 
265  unsigned Op1High = Combined % 3;
266  unsigned Op2High = (Combined / 3) % 3;
267  unsigned Op3High = Combined / 9;
268  Op1 = (Op1High << 2) | fieldFromInstruction(Insn, 4, 2);
269  Op2 = (Op2High << 2) | fieldFromInstruction(Insn, 2, 2);
270  Op3 = (Op3High << 2) | fieldFromInstruction(Insn, 0, 2);
271  return MCDisassembler::Success;
272 }
273 
274 static DecodeStatus
275 Decode2OpInstructionFail(MCInst &Inst, unsigned Insn, uint64_t Address,
276  const void *Decoder) {
277  // Try and decode as a 3R instruction.
278  unsigned Opcode = fieldFromInstruction(Insn, 11, 5);
279  switch (Opcode) {
280  case 0x0:
281  Inst.setOpcode(XCore::STW_2rus);
282  return Decode2RUSInstruction(Inst, Insn, Address, Decoder);
283  case 0x1:
284  Inst.setOpcode(XCore::LDW_2rus);
285  return Decode2RUSInstruction(Inst, Insn, Address, Decoder);
286  case 0x2:
287  Inst.setOpcode(XCore::ADD_3r);
288  return Decode3RInstruction(Inst, Insn, Address, Decoder);
289  case 0x3:
290  Inst.setOpcode(XCore::SUB_3r);
291  return Decode3RInstruction(Inst, Insn, Address, Decoder);
292  case 0x4:
293  Inst.setOpcode(XCore::SHL_3r);
294  return Decode3RInstruction(Inst, Insn, Address, Decoder);
295  case 0x5:
296  Inst.setOpcode(XCore::SHR_3r);
297  return Decode3RInstruction(Inst, Insn, Address, Decoder);
298  case 0x6:
299  Inst.setOpcode(XCore::EQ_3r);
300  return Decode3RInstruction(Inst, Insn, Address, Decoder);
301  case 0x7:
302  Inst.setOpcode(XCore::AND_3r);
303  return Decode3RInstruction(Inst, Insn, Address, Decoder);
304  case 0x8:
305  Inst.setOpcode(XCore::OR_3r);
306  return Decode3RInstruction(Inst, Insn, Address, Decoder);
307  case 0x9:
308  Inst.setOpcode(XCore::LDW_3r);
309  return Decode3RInstruction(Inst, Insn, Address, Decoder);
310  case 0x10:
311  Inst.setOpcode(XCore::LD16S_3r);
312  return Decode3RInstruction(Inst, Insn, Address, Decoder);
313  case 0x11:
314  Inst.setOpcode(XCore::LD8U_3r);
315  return Decode3RInstruction(Inst, Insn, Address, Decoder);
316  case 0x12:
317  Inst.setOpcode(XCore::ADD_2rus);
318  return Decode2RUSInstruction(Inst, Insn, Address, Decoder);
319  case 0x13:
320  Inst.setOpcode(XCore::SUB_2rus);
321  return Decode2RUSInstruction(Inst, Insn, Address, Decoder);
322  case 0x14:
323  Inst.setOpcode(XCore::SHL_2rus);
324  return Decode2RUSBitpInstruction(Inst, Insn, Address, Decoder);
325  case 0x15:
326  Inst.setOpcode(XCore::SHR_2rus);
327  return Decode2RUSBitpInstruction(Inst, Insn, Address, Decoder);
328  case 0x16:
329  Inst.setOpcode(XCore::EQ_2rus);
330  return Decode2RUSInstruction(Inst, Insn, Address, Decoder);
331  case 0x17:
332  Inst.setOpcode(XCore::TSETR_3r);
333  return Decode3RImmInstruction(Inst, Insn, Address, Decoder);
334  case 0x18:
335  Inst.setOpcode(XCore::LSS_3r);
336  return Decode3RInstruction(Inst, Insn, Address, Decoder);
337  case 0x19:
338  Inst.setOpcode(XCore::LSU_3r);
339  return Decode3RInstruction(Inst, Insn, Address, Decoder);
340  }
341  return MCDisassembler::Fail;
342 }
343 
344 static DecodeStatus
345 Decode2RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
346  const void *Decoder) {
347  unsigned Op1, Op2;
348  DecodeStatus S = Decode2OpInstruction(Insn, Op1, Op2);
349  if (S != MCDisassembler::Success)
350  return Decode2OpInstructionFail(Inst, Insn, Address, Decoder);
351 
352  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
353  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
354  return S;
355 }
356 
357 static DecodeStatus
358 Decode2RImmInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
359  const void *Decoder) {
360  unsigned Op1, Op2;
361  DecodeStatus S = Decode2OpInstruction(Insn, Op1, Op2);
362  if (S != MCDisassembler::Success)
363  return Decode2OpInstructionFail(Inst, Insn, Address, Decoder);
364 
365  Inst.addOperand(MCOperand::createImm(Op1));
366  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
367  return S;
368 }
369 
370 static DecodeStatus
371 DecodeR2RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
372  const void *Decoder) {
373  unsigned Op1, Op2;
374  DecodeStatus S = Decode2OpInstruction(Insn, Op2, Op1);
375  if (S != MCDisassembler::Success)
376  return Decode2OpInstructionFail(Inst, Insn, Address, Decoder);
377 
378  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
379  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
380  return S;
381 }
382 
383 static DecodeStatus
384 Decode2RSrcDstInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
385  const void *Decoder) {
386  unsigned Op1, Op2;
387  DecodeStatus S = Decode2OpInstruction(Insn, Op1, Op2);
388  if (S != MCDisassembler::Success)
389  return Decode2OpInstructionFail(Inst, Insn, Address, Decoder);
390 
391  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
392  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
393  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
394  return S;
395 }
396 
397 static DecodeStatus
398 DecodeRUSInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
399  const void *Decoder) {
400  unsigned Op1, Op2;
401  DecodeStatus S = Decode2OpInstruction(Insn, Op1, Op2);
402  if (S != MCDisassembler::Success)
403  return Decode2OpInstructionFail(Inst, Insn, Address, Decoder);
404 
405  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
406  Inst.addOperand(MCOperand::createImm(Op2));
407  return S;
408 }
409 
410 static DecodeStatus
411 DecodeRUSBitpInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
412  const void *Decoder) {
413  unsigned Op1, Op2;
414  DecodeStatus S = Decode2OpInstruction(Insn, Op1, Op2);
415  if (S != MCDisassembler::Success)
416  return Decode2OpInstructionFail(Inst, Insn, Address, Decoder);
417 
418  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
419  DecodeBitpOperand(Inst, Op2, Address, Decoder);
420  return S;
421 }
422 
423 static DecodeStatus
424 DecodeRUSSrcDstBitpInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
425  const void *Decoder) {
426  unsigned Op1, Op2;
427  DecodeStatus S = Decode2OpInstruction(Insn, Op1, Op2);
428  if (S != MCDisassembler::Success)
429  return Decode2OpInstructionFail(Inst, Insn, Address, Decoder);
430 
431  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
432  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
433  DecodeBitpOperand(Inst, Op2, Address, Decoder);
434  return S;
435 }
436 
437 static DecodeStatus
438 DecodeL2OpInstructionFail(MCInst &Inst, unsigned Insn, uint64_t Address,
439  const void *Decoder) {
440  // Try and decode as a L3R / L2RUS instruction.
441  unsigned Opcode = fieldFromInstruction(Insn, 16, 4) |
442  fieldFromInstruction(Insn, 27, 5) << 4;
443  switch (Opcode) {
444  case 0x0c:
445  Inst.setOpcode(XCore::STW_l3r);
446  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
447  case 0x1c:
448  Inst.setOpcode(XCore::XOR_l3r);
449  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
450  case 0x2c:
451  Inst.setOpcode(XCore::ASHR_l3r);
452  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
453  case 0x3c:
454  Inst.setOpcode(XCore::LDAWF_l3r);
455  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
456  case 0x4c:
457  Inst.setOpcode(XCore::LDAWB_l3r);
458  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
459  case 0x5c:
460  Inst.setOpcode(XCore::LDA16F_l3r);
461  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
462  case 0x6c:
463  Inst.setOpcode(XCore::LDA16B_l3r);
464  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
465  case 0x7c:
466  Inst.setOpcode(XCore::MUL_l3r);
467  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
468  case 0x8c:
469  Inst.setOpcode(XCore::DIVS_l3r);
470  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
471  case 0x9c:
472  Inst.setOpcode(XCore::DIVU_l3r);
473  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
474  case 0x10c:
475  Inst.setOpcode(XCore::ST16_l3r);
476  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
477  case 0x11c:
478  Inst.setOpcode(XCore::ST8_l3r);
479  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
480  case 0x12c:
481  Inst.setOpcode(XCore::ASHR_l2rus);
482  return DecodeL2RUSBitpInstruction(Inst, Insn, Address, Decoder);
483  case 0x12d:
484  Inst.setOpcode(XCore::OUTPW_l2rus);
485  return DecodeL2RUSBitpInstruction(Inst, Insn, Address, Decoder);
486  case 0x12e:
487  Inst.setOpcode(XCore::INPW_l2rus);
488  return DecodeL2RUSBitpInstruction(Inst, Insn, Address, Decoder);
489  case 0x13c:
490  Inst.setOpcode(XCore::LDAWF_l2rus);
491  return DecodeL2RUSInstruction(Inst, Insn, Address, Decoder);
492  case 0x14c:
493  Inst.setOpcode(XCore::LDAWB_l2rus);
494  return DecodeL2RUSInstruction(Inst, Insn, Address, Decoder);
495  case 0x15c:
496  Inst.setOpcode(XCore::CRC_l3r);
497  return DecodeL3RSrcDstInstruction(Inst, Insn, Address, Decoder);
498  case 0x18c:
499  Inst.setOpcode(XCore::REMS_l3r);
500  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
501  case 0x19c:
502  Inst.setOpcode(XCore::REMU_l3r);
503  return DecodeL3RInstruction(Inst, Insn, Address, Decoder);
504  }
505  return MCDisassembler::Fail;
506 }
507 
508 static DecodeStatus
509 DecodeL2RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
510  const void *Decoder) {
511  unsigned Op1, Op2;
512  DecodeStatus S = Decode2OpInstruction(fieldFromInstruction(Insn, 0, 16),
513  Op1, Op2);
514  if (S != MCDisassembler::Success)
515  return DecodeL2OpInstructionFail(Inst, Insn, Address, Decoder);
516 
517  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
518  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
519  return S;
520 }
521 
522 static DecodeStatus
523 DecodeLR2RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
524  const void *Decoder) {
525  unsigned Op1, Op2;
526  DecodeStatus S = Decode2OpInstruction(fieldFromInstruction(Insn, 0, 16),
527  Op1, Op2);
528  if (S != MCDisassembler::Success)
529  return DecodeL2OpInstructionFail(Inst, Insn, Address, Decoder);
530 
531  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
532  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
533  return S;
534 }
535 
536 static DecodeStatus
537 Decode3RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
538  const void *Decoder) {
539  unsigned Op1, Op2, Op3;
540  DecodeStatus S = Decode3OpInstruction(Insn, Op1, Op2, Op3);
541  if (S == MCDisassembler::Success) {
542  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
543  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
544  DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
545  }
546  return S;
547 }
548 
549 static DecodeStatus
550 Decode3RImmInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
551  const void *Decoder) {
552  unsigned Op1, Op2, Op3;
553  DecodeStatus S = Decode3OpInstruction(Insn, Op1, Op2, Op3);
554  if (S == MCDisassembler::Success) {
555  Inst.addOperand(MCOperand::createImm(Op1));
556  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
557  DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
558  }
559  return S;
560 }
561 
562 static DecodeStatus
563 Decode2RUSInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
564  const void *Decoder) {
565  unsigned Op1, Op2, Op3;
566  DecodeStatus S = Decode3OpInstruction(Insn, Op1, Op2, Op3);
567  if (S == MCDisassembler::Success) {
568  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
569  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
570  Inst.addOperand(MCOperand::createImm(Op3));
571  }
572  return S;
573 }
574 
575 static DecodeStatus
576 Decode2RUSBitpInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
577  const void *Decoder) {
578  unsigned Op1, Op2, Op3;
579  DecodeStatus S = Decode3OpInstruction(Insn, Op1, Op2, Op3);
580  if (S == MCDisassembler::Success) {
581  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
582  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
583  DecodeBitpOperand(Inst, Op3, Address, Decoder);
584  }
585  return S;
586 }
587 
588 static DecodeStatus
589 DecodeL3RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
590  const void *Decoder) {
591  unsigned Op1, Op2, Op3;
592  DecodeStatus S =
593  Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
594  if (S == MCDisassembler::Success) {
595  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
596  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
597  DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
598  }
599  return S;
600 }
601 
602 static DecodeStatus
603 DecodeL3RSrcDstInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
604  const void *Decoder) {
605  unsigned Op1, Op2, Op3;
606  DecodeStatus S =
607  Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
608  if (S == MCDisassembler::Success) {
609  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
610  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
611  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
612  DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
613  }
614  return S;
615 }
616 
617 static DecodeStatus
618 DecodeL2RUSInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
619  const void *Decoder) {
620  unsigned Op1, Op2, Op3;
621  DecodeStatus S =
622  Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
623  if (S == MCDisassembler::Success) {
624  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
625  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
626  Inst.addOperand(MCOperand::createImm(Op3));
627  }
628  return S;
629 }
630 
631 static DecodeStatus
632 DecodeL2RUSBitpInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
633  const void *Decoder) {
634  unsigned Op1, Op2, Op3;
635  DecodeStatus S =
636  Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
637  if (S == MCDisassembler::Success) {
638  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
639  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
640  DecodeBitpOperand(Inst, Op3, Address, Decoder);
641  }
642  return S;
643 }
644 
645 static DecodeStatus
646 DecodeL6RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
647  const void *Decoder) {
648  unsigned Op1, Op2, Op3, Op4, Op5, Op6;
649  DecodeStatus S =
650  Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
651  if (S != MCDisassembler::Success)
652  return S;
653  S = Decode3OpInstruction(fieldFromInstruction(Insn, 16, 16), Op4, Op5, Op6);
654  if (S != MCDisassembler::Success)
655  return S;
656  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
657  DecodeGRRegsRegisterClass(Inst, Op4, Address, Decoder);
658  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
659  DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
660  DecodeGRRegsRegisterClass(Inst, Op5, Address, Decoder);
661  DecodeGRRegsRegisterClass(Inst, Op6, Address, Decoder);
662  return S;
663 }
664 
665 static DecodeStatus
666 DecodeL5RInstructionFail(MCInst &Inst, unsigned Insn, uint64_t Address,
667  const void *Decoder) {
668  // Try and decode as a L6R instruction.
669  Inst.clear();
670  unsigned Opcode = fieldFromInstruction(Insn, 27, 5);
671  switch (Opcode) {
672  case 0x00:
673  Inst.setOpcode(XCore::LMUL_l6r);
674  return DecodeL6RInstruction(Inst, Insn, Address, Decoder);
675  }
676  return MCDisassembler::Fail;
677 }
678 
679 static DecodeStatus
680 DecodeL5RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
681  const void *Decoder) {
682  unsigned Op1, Op2, Op3, Op4, Op5;
683  DecodeStatus S =
684  Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
685  if (S != MCDisassembler::Success)
686  return DecodeL5RInstructionFail(Inst, Insn, Address, Decoder);
687  S = Decode2OpInstruction(fieldFromInstruction(Insn, 16, 16), Op4, Op5);
688  if (S != MCDisassembler::Success)
689  return DecodeL5RInstructionFail(Inst, Insn, Address, Decoder);
690 
691  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
692  DecodeGRRegsRegisterClass(Inst, Op4, Address, Decoder);
693  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
694  DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
695  DecodeGRRegsRegisterClass(Inst, Op5, Address, Decoder);
696  return S;
697 }
698 
699 static DecodeStatus
700 DecodeL4RSrcDstInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
701  const void *Decoder) {
702  unsigned Op1, Op2, Op3;
703  unsigned Op4 = fieldFromInstruction(Insn, 16, 4);
704  DecodeStatus S =
705  Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
706  if (S == MCDisassembler::Success) {
707  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
708  S = DecodeGRRegsRegisterClass(Inst, Op4, Address, Decoder);
709  }
710  if (S == MCDisassembler::Success) {
711  DecodeGRRegsRegisterClass(Inst, Op4, Address, Decoder);
712  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
713  DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
714  }
715  return S;
716 }
717 
718 static DecodeStatus
719 DecodeL4RSrcDstSrcDstInstruction(MCInst &Inst, unsigned Insn, uint64_t Address,
720  const void *Decoder) {
721  unsigned Op1, Op2, Op3;
722  unsigned Op4 = fieldFromInstruction(Insn, 16, 4);
723  DecodeStatus S =
724  Decode3OpInstruction(fieldFromInstruction(Insn, 0, 16), Op1, Op2, Op3);
725  if (S == MCDisassembler::Success) {
726  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
727  S = DecodeGRRegsRegisterClass(Inst, Op4, Address, Decoder);
728  }
729  if (S == MCDisassembler::Success) {
730  DecodeGRRegsRegisterClass(Inst, Op1, Address, Decoder);
731  DecodeGRRegsRegisterClass(Inst, Op4, Address, Decoder);
732  DecodeGRRegsRegisterClass(Inst, Op2, Address, Decoder);
733  DecodeGRRegsRegisterClass(Inst, Op3, Address, Decoder);
734  }
735  return S;
736 }
737 
738 MCDisassembler::DecodeStatus XCoreDisassembler::getInstruction(
739  MCInst &instr, uint64_t &Size, ArrayRef<uint8_t> Bytes, uint64_t Address,
740  raw_ostream &vStream, raw_ostream &cStream) const {
741  uint16_t insn16;
742 
743  if (!readInstruction16(Bytes, Address, Size, insn16)) {
744  return Fail;
745  }
746 
747  // Calling the auto-generated decoder function.
748  DecodeStatus Result = decodeInstruction(DecoderTable16, instr, insn16,
749  Address, this, STI);
750  if (Result != Fail) {
751  Size = 2;
752  return Result;
753  }
754 
755  uint32_t insn32;
756 
757  if (!readInstruction32(Bytes, Address, Size, insn32)) {
758  return Fail;
759  }
760 
761  // Calling the auto-generated decoder function.
762  Result = decodeInstruction(DecoderTable32, instr, insn32, Address, this, STI);
763  if (Result != Fail) {
764  Size = 4;
765  return Result;
766  }
767 
768  return Fail;
769 }
770 
771 namespace llvm {
772  Target &getTheXCoreTarget();
773 }
774 
775 static MCDisassembler *createXCoreDisassembler(const Target &T,
776  const MCSubtargetInfo &STI,
777  MCContext &Ctx) {
778  return new XCoreDisassembler(STI, Ctx);
779 }
780 
781 extern "C" void LLVMInitializeXCoreDisassembler() {
782  // Register the disassembler.
783  TargetRegistry::RegisterMCDisassembler(getTheXCoreTarget(),
784  createXCoreDisassembler);
785 }
DecodeRRegsRegisterClass
static DecodeStatus DecodeRRegsRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:211
llvm::MCRegisterClass::begin
iterator begin() const
begin/end - Return all of the registers in this class.
Definition: MCRegisterInfo.h:53
DecodeL6RInstruction
static DecodeStatus DecodeL6RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:646
llvm
This class represents lattice values for constants.
Definition: AllocatorList.h:24
llvm::MCInst::clear
void clear()
Definition: MCInst.h:191
llvm::MCDisassembler::DecodeStatus
DecodeStatus
Ternary decode status.
Definition: MCDisassembler.h:51
llvm::MCDisassembler
Superclass for all disassemblers.
Definition: MCDisassembler.h:27
DecodeL2RUSInstruction
static DecodeStatus DecodeL2RUSInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:618
Reg
unsigned Reg
Definition: MachineSink.cpp:979
DecodeL4RSrcDstInstruction
static DecodeStatus DecodeL4RSrcDstInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:700
DecodeRUSInstruction
static DecodeStatus DecodeRUSInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:398
llvm::TargetRegistry::RegisterMCDisassembler
static void RegisterMCDisassembler(Target &T, Target::MCDisassemblerCtorTy Fn)
RegisterMCDisassembler - Register a MCDisassembler implementation for the given target.
Definition: TargetRegistry.h:808
DecodeL3RInstruction
static DecodeStatus DecodeL3RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:589
createXCoreDisassembler
static MCDisassembler * createXCoreDisassembler(const Target &T, const MCSubtargetInfo &STI, MCContext &Ctx)
Definition: XCoreDisassembler.cpp:775
llvm::MCOperand::createReg
static MCOperand createReg(unsigned Reg)
Definition: MCInst.h:116
DecodeGRRegsRegisterClass
static DecodeStatus DecodeGRRegsRegisterClass(MCInst &Inst, unsigned RegNo, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:199
Fail
#define Fail
Definition: AArch64Disassembler.cpp:247
DecodeL3RSrcDstInstruction
static DecodeStatus DecodeL3RSrcDstInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:603
Decode3OpInstruction
static DecodeStatus Decode3OpInstruction(unsigned Insn, unsigned &Op1, unsigned &Op2, unsigned &Op3)
Definition: XCoreDisassembler.cpp:259
DecodeNegImmOperand
static DecodeStatus DecodeNegImmOperand(MCInst &Inst, unsigned Val, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:234
DecodeBitpOperand
static DecodeStatus DecodeBitpOperand(MCInst &Inst, unsigned Val, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:223
Decode3RImmInstruction
static DecodeStatus Decode3RImmInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:550
llvm::MCContext
Context object for machine code objects.
Definition: MCContext.h:63
llvm::X86Disassembler::decodeInstruction
int decodeInstruction(InternalInstruction *insn, byteReader_t reader, const void *readerArg, dlog_t logger, void *loggerArg, const void *miiArg, uint64_t startLoc, DisassemblerMode mode)
Decode one instruction and store the decoding results in a buffer provided by the consumer...
Definition: X86DisassemblerDecoder.cpp:1899
Decode2RInstruction
static DecodeStatus Decode2RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:345
Decode2RUSInstruction
static DecodeStatus Decode2RUSInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:563
llvm::MCInst
Instances of this class represent a single low-level machine instruction.
Definition: MCInst.h:161
llvm::MCRegisterInfo
MCRegisterInfo base class - We assume that the target defines a static array of MCRegisterDesc object...
Definition: MCRegisterInfo.h:129
readInstruction32
static bool readInstruction32(ArrayRef< uint8_t > Bytes, uint64_t Address, uint64_t &Size, uint32_t &Insn)
Definition: XCoreDisassembler.cpp:57
llvm::ArrayRef::size
size_t size() const
size - Get the array size.
Definition: ArrayRef.h:149
DecodeL2RUSBitpInstruction
static DecodeStatus DecodeL2RUSBitpInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:632
DecodeRUSBitpInstruction
static DecodeStatus DecodeRUSBitpInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:411
DecodeL2OpInstructionFail
static DecodeStatus DecodeL2OpInstructionFail(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:438
Decode2RSrcDstInstruction
static DecodeStatus Decode2RSrcDstInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:384
Decode2RImmInstruction
static DecodeStatus Decode2RImmInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:358
DecodeL5RInstructionFail
static DecodeStatus DecodeL5RInstructionFail(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:666
uint32_t
llvm::getTheXCoreTarget
Target & getTheXCoreTarget()
Definition: XCoreTargetInfo.cpp:15
llvm::MCInst::setOpcode
void setOpcode(unsigned Op)
Definition: MCInst.h:173
Decode2OpInstructionFail
static DecodeStatus Decode2OpInstructionFail(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:275
Decode2OpInstruction
static DecodeStatus Decode2OpInstruction(unsigned Insn, unsigned &Op1, unsigned &Op2)
Definition: XCoreDisassembler.cpp:241
DecodeL4RSrcDstSrcDstInstruction
static DecodeStatus DecodeL4RSrcDstSrcDstInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:719
D
static GCRegistry::Add< StatepointGC > D("statepoint-example", "an example strategy for statepoint")
DecodeL5RInstruction
static DecodeStatus DecodeL5RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:680
llvm::Target
Target - Wrapper for Target specific information.
Definition: TargetRegistry.h:120
DecodeRUSSrcDstBitpInstruction
static DecodeStatus DecodeRUSSrcDstBitpInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:424
Decode2RUSBitpInstruction
static DecodeStatus Decode2RUSBitpInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:576
readInstruction16
static bool readInstruction16(ArrayRef< uint8_t > Bytes, uint64_t Address, uint64_t &Size, uint16_t &Insn)
Definition: XCoreDisassembler.cpp:45
DecodeR2RInstruction
static DecodeStatus DecodeR2RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:371
llvm::MCSubtargetInfo
Generic base class for all target subtargets.
Definition: MCSubtargetInfo.h:36
DecodeLR2RInstruction
static DecodeStatus DecodeLR2RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:523
Size
uint32_t Size
Definition: Profile.cpp:47
DecodeStatus
MCDisassembler::DecodeStatus DecodeStatus
Definition: XCoreDisassembler.cpp:28
Decode3RInstruction
static DecodeStatus Decode3RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:537
DecodeL2RInstruction
static DecodeStatus DecodeL2RInstruction(MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder)
Definition: XCoreDisassembler.cpp:509
LLVMInitializeXCoreDisassembler
void LLVMInitializeXCoreDisassembler()
Definition: XCoreDisassembler.cpp:781
llvm::raw_ostream
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:46
llvm::MCInst::addOperand
void addOperand(const MCOperand &Op)
Definition: MCInst.h:186
getReg
static unsigned getReg(const void *D, unsigned RC, unsigned RegNo)
Definition: XCoreDisassembler.cpp:70
llvm::MCOperand::createImm
static MCOperand createImm(int64_t Val)
Definition: MCInst.h:123
llvm::MCRegisterInfo::getRegClass
const MCRegisterClass & getRegClass(unsigned i) const
Returns the register class associated with the enumeration value.
Definition: MCRegisterInfo.h:433
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