1 //===- ARMDisassemblerCore.cpp - ARM disassembler helpers -------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file is part of the ARM Disassembler.
11 // It contains code to represent the core concepts of Builder and DisassembleFP
12 // to solve the problem of disassembling an ARM instr.
14 //===----------------------------------------------------------------------===//
16 #define DEBUG_TYPE "arm-disassembler"
18 #include "ARMDisassemblerCore.h"
19 #include "ARMAddressingModes.h"
20 #include "ARMMCExpr.h"
21 #include "llvm/Support/Debug.h"
22 #include "llvm/Support/raw_ostream.h"
24 //#define DEBUG(X) do { X; } while (0)
26 /// ARMGenInstrInfo.inc - ARMGenInstrInfo.inc contains the static const
27 /// MCInstrDesc ARMInsts[] definition and the MCOperandInfo[]'s describing the
28 /// operand info for each ARMInsts[i].
30 /// Together with an instruction's encoding format, we can take advantage of the
31 /// NumOperands and the OpInfo fields of the target instruction description in
32 /// the quest to build out the MCOperand list for an MCInst.
34 /// The general guideline is that with a known format, the number of dst and src
35 /// operands are well-known. The dst is built first, followed by the src
36 /// operand(s). The operands not yet used at this point are for the Implicit
37 /// Uses and Defs by this instr. For the Uses part, the pred:$p operand is
38 /// defined with two components:
40 /// def pred { // Operand PredicateOperand
41 /// ValueType Type = OtherVT;
42 /// string PrintMethod = "printPredicateOperand";
43 /// string AsmOperandLowerMethod = ?;
44 /// dag MIOperandInfo = (ops i32imm, CCR);
45 /// AsmOperandClass ParserMatchClass = ImmAsmOperand;
46 /// dag DefaultOps = (ops (i32 14), (i32 zero_reg));
49 /// which is manifested by the MCOperandInfo[] of:
51 /// { 0, 0|(1<<MCOI::Predicate), 0 },
52 /// { ARM::CCRRegClassID, 0|(1<<MCOI::Predicate), 0 }
54 /// So the first predicate MCOperand corresponds to the immediate part of the
55 /// ARM condition field (Inst{31-28}), and the second predicate MCOperand
56 /// corresponds to a register kind of ARM::CPSR.
58 /// For the Defs part, in the simple case of only cc_out:$s, we have:
60 /// def cc_out { // Operand OptionalDefOperand
61 /// ValueType Type = OtherVT;
62 /// string PrintMethod = "printSBitModifierOperand";
63 /// string AsmOperandLowerMethod = ?;
64 /// dag MIOperandInfo = (ops CCR);
65 /// AsmOperandClass ParserMatchClass = ImmAsmOperand;
66 /// dag DefaultOps = (ops (i32 zero_reg));
69 /// which is manifested by the one MCOperandInfo of:
71 /// { ARM::CCRRegClassID, 0|(1<<MCOI::OptionalDef), 0 }
75 extern MCInstrDesc ARMInsts[];
80 const char *ARMUtils::OpcodeName(unsigned Opcode) {
81 return ARMInsts[Opcode].Name;
84 // Return the register enum Based on RegClass and the raw register number.
87 getRegisterEnum(BO B, unsigned RegClassID, unsigned RawRegister) {
88 if (RegClassID == ARM::rGPRRegClassID) {
89 // Check for The register numbers 13 and 15 that are not permitted for many
90 // Thumb register specifiers.
91 if (RawRegister == 13 || RawRegister == 15) {
95 // For this purpose, we can treat rGPR as if it were GPR.
96 RegClassID = ARM::GPRRegClassID;
99 // See also decodeNEONRd(), decodeNEONRn(), decodeNEONRm().
100 // A7.3 register encoding
101 // Qd -> bit[12] == 0
102 // Qn -> bit[16] == 0
105 // If one of these bits is 1, the instruction is UNDEFINED.
106 if (RegClassID == ARM::QPRRegClassID && slice(RawRegister, 0, 0) == 1) {
111 RegClassID == ARM::QPRRegClassID ? RawRegister >> 1 : RawRegister;
117 switch (RegClassID) {
118 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R0;
119 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
120 case ARM::DPR_VFP2RegClassID:
122 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
123 case ARM::QPR_VFP2RegClassID:
125 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S0;
129 switch (RegClassID) {
130 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R1;
131 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
132 case ARM::DPR_VFP2RegClassID:
134 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
135 case ARM::QPR_VFP2RegClassID:
137 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S1;
141 switch (RegClassID) {
142 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R2;
143 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
144 case ARM::DPR_VFP2RegClassID:
146 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
147 case ARM::QPR_VFP2RegClassID:
149 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S2;
153 switch (RegClassID) {
154 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R3;
155 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
156 case ARM::DPR_VFP2RegClassID:
158 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
159 case ARM::QPR_VFP2RegClassID:
161 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S3;
165 switch (RegClassID) {
166 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R4;
167 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
168 case ARM::DPR_VFP2RegClassID:
170 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q4;
171 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S4;
175 switch (RegClassID) {
176 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R5;
177 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
178 case ARM::DPR_VFP2RegClassID:
180 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q5;
181 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S5;
185 switch (RegClassID) {
186 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R6;
187 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
188 case ARM::DPR_VFP2RegClassID:
190 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q6;
191 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S6;
195 switch (RegClassID) {
196 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R7;
197 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
198 case ARM::DPR_VFP2RegClassID:
200 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q7;
201 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S7;
205 switch (RegClassID) {
206 case ARM::GPRRegClassID: return ARM::R8;
207 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D8;
208 case ARM::QPRRegClassID: return ARM::Q8;
209 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S8;
213 switch (RegClassID) {
214 case ARM::GPRRegClassID: return ARM::R9;
215 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D9;
216 case ARM::QPRRegClassID: return ARM::Q9;
217 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S9;
221 switch (RegClassID) {
222 case ARM::GPRRegClassID: return ARM::R10;
223 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D10;
224 case ARM::QPRRegClassID: return ARM::Q10;
225 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S10;
229 switch (RegClassID) {
230 case ARM::GPRRegClassID: return ARM::R11;
231 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D11;
232 case ARM::QPRRegClassID: return ARM::Q11;
233 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S11;
237 switch (RegClassID) {
238 case ARM::GPRRegClassID: return ARM::R12;
239 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D12;
240 case ARM::QPRRegClassID: return ARM::Q12;
241 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S12;
245 switch (RegClassID) {
246 case ARM::GPRRegClassID: return ARM::SP;
247 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D13;
248 case ARM::QPRRegClassID: return ARM::Q13;
249 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S13;
253 switch (RegClassID) {
254 case ARM::GPRRegClassID: return ARM::LR;
255 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D14;
256 case ARM::QPRRegClassID: return ARM::Q14;
257 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S14;
261 switch (RegClassID) {
262 case ARM::GPRRegClassID: return ARM::PC;
263 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D15;
264 case ARM::QPRRegClassID: return ARM::Q15;
265 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S15;
269 switch (RegClassID) {
270 case ARM::DPRRegClassID: return ARM::D16;
271 case ARM::SPRRegClassID: return ARM::S16;
275 switch (RegClassID) {
276 case ARM::DPRRegClassID: return ARM::D17;
277 case ARM::SPRRegClassID: return ARM::S17;
281 switch (RegClassID) {
282 case ARM::DPRRegClassID: return ARM::D18;
283 case ARM::SPRRegClassID: return ARM::S18;
287 switch (RegClassID) {
288 case ARM::DPRRegClassID: return ARM::D19;
289 case ARM::SPRRegClassID: return ARM::S19;
293 switch (RegClassID) {
294 case ARM::DPRRegClassID: return ARM::D20;
295 case ARM::SPRRegClassID: return ARM::S20;
299 switch (RegClassID) {
300 case ARM::DPRRegClassID: return ARM::D21;
301 case ARM::SPRRegClassID: return ARM::S21;
305 switch (RegClassID) {
306 case ARM::DPRRegClassID: return ARM::D22;
307 case ARM::SPRRegClassID: return ARM::S22;
311 switch (RegClassID) {
312 case ARM::DPRRegClassID: return ARM::D23;
313 case ARM::SPRRegClassID: return ARM::S23;
317 switch (RegClassID) {
318 case ARM::DPRRegClassID: return ARM::D24;
319 case ARM::SPRRegClassID: return ARM::S24;
323 switch (RegClassID) {
324 case ARM::DPRRegClassID: return ARM::D25;
325 case ARM::SPRRegClassID: return ARM::S25;
329 switch (RegClassID) {
330 case ARM::DPRRegClassID: return ARM::D26;
331 case ARM::SPRRegClassID: return ARM::S26;
335 switch (RegClassID) {
336 case ARM::DPRRegClassID: return ARM::D27;
337 case ARM::SPRRegClassID: return ARM::S27;
341 switch (RegClassID) {
342 case ARM::DPRRegClassID: return ARM::D28;
343 case ARM::SPRRegClassID: return ARM::S28;
347 switch (RegClassID) {
348 case ARM::DPRRegClassID: return ARM::D29;
349 case ARM::SPRRegClassID: return ARM::S29;
353 switch (RegClassID) {
354 case ARM::DPRRegClassID: return ARM::D30;
355 case ARM::SPRRegClassID: return ARM::S30;
359 switch (RegClassID) {
360 case ARM::DPRRegClassID: return ARM::D31;
361 case ARM::SPRRegClassID: return ARM::S31;
365 DEBUG(errs() << "Invalid (RegClassID, RawRegister) combination\n");
366 // Encoding error. Mark the builder with error code != 0.
371 ///////////////////////////////
373 // Utility Functions //
375 ///////////////////////////////
377 // Extract/Decode Rd: Inst{15-12}.
378 static inline unsigned decodeRd(uint32_t insn) {
379 return (insn >> ARMII::RegRdShift) & ARMII::GPRRegMask;
382 // Extract/Decode Rn: Inst{19-16}.
383 static inline unsigned decodeRn(uint32_t insn) {
384 return (insn >> ARMII::RegRnShift) & ARMII::GPRRegMask;
387 // Extract/Decode Rm: Inst{3-0}.
388 static inline unsigned decodeRm(uint32_t insn) {
389 return (insn & ARMII::GPRRegMask);
392 // Extract/Decode Rs: Inst{11-8}.
393 static inline unsigned decodeRs(uint32_t insn) {
394 return (insn >> ARMII::RegRsShift) & ARMII::GPRRegMask;
397 static inline unsigned getCondField(uint32_t insn) {
398 return (insn >> ARMII::CondShift);
401 static inline unsigned getIBit(uint32_t insn) {
402 return (insn >> ARMII::I_BitShift) & 1;
405 static inline unsigned getAM3IBit(uint32_t insn) {
406 return (insn >> ARMII::AM3_I_BitShift) & 1;
409 static inline unsigned getPBit(uint32_t insn) {
410 return (insn >> ARMII::P_BitShift) & 1;
413 static inline unsigned getUBit(uint32_t insn) {
414 return (insn >> ARMII::U_BitShift) & 1;
417 static inline unsigned getPUBits(uint32_t insn) {
418 return (insn >> ARMII::U_BitShift) & 3;
421 static inline unsigned getSBit(uint32_t insn) {
422 return (insn >> ARMII::S_BitShift) & 1;
425 static inline unsigned getWBit(uint32_t insn) {
426 return (insn >> ARMII::W_BitShift) & 1;
429 static inline unsigned getDBit(uint32_t insn) {
430 return (insn >> ARMII::D_BitShift) & 1;
433 static inline unsigned getNBit(uint32_t insn) {
434 return (insn >> ARMII::N_BitShift) & 1;
437 static inline unsigned getMBit(uint32_t insn) {
438 return (insn >> ARMII::M_BitShift) & 1;
441 // See A8.4 Shifts applied to a register.
442 // A8.4.2 Register controlled shifts.
444 // getShiftOpcForBits - getShiftOpcForBits translates from the ARM encoding bits
445 // into llvm enums for shift opcode. The API clients should pass in the value
446 // encoded with two bits, so the assert stays to signal a wrong API usage.
448 // A8-12: DecodeRegShift()
449 static inline ARM_AM::ShiftOpc getShiftOpcForBits(unsigned bits) {
451 default: assert(0 && "No such value"); return ARM_AM::no_shift;
452 case 0: return ARM_AM::lsl;
453 case 1: return ARM_AM::lsr;
454 case 2: return ARM_AM::asr;
455 case 3: return ARM_AM::ror;
459 // See A8.4 Shifts applied to a register.
460 // A8.4.1 Constant shifts.
462 // getImmShiftSE - getImmShiftSE translates from the raw ShiftOpc and raw Imm5
463 // encodings into the intended ShiftOpc and shift amount.
465 // A8-11: DecodeImmShift()
466 static inline void getImmShiftSE(ARM_AM::ShiftOpc &ShOp, unsigned &ShImm) {
470 case ARM_AM::no_shift:
474 ShOp = ARM_AM::no_shift;
486 // getAMSubModeForBits - getAMSubModeForBits translates from the ARM encoding
487 // bits Inst{24-23} (P(24) and U(23)) into llvm enums for AMSubMode. The API
488 // clients should pass in the value encoded with two bits, so the assert stays
489 // to signal a wrong API usage.
490 static inline ARM_AM::AMSubMode getAMSubModeForBits(unsigned bits) {
492 default: assert(0 && "No such value"); return ARM_AM::bad_am_submode;
493 case 1: return ARM_AM::ia; // P=0 U=1
494 case 3: return ARM_AM::ib; // P=1 U=1
495 case 0: return ARM_AM::da; // P=0 U=0
496 case 2: return ARM_AM::db; // P=1 U=0
500 ////////////////////////////////////////////
502 // Disassemble function definitions //
504 ////////////////////////////////////////////
506 /// There is a separate Disassemble*Frm function entry for disassembly of an ARM
507 /// instr into a list of MCOperands in the appropriate order, with possible dst,
508 /// followed by possible src(s).
510 /// The processing of the predicate, and the 'S' modifier bit, if MI modifies
511 /// the CPSR, is factored into ARMBasicMCBuilder's method named
512 /// TryPredicateAndSBitModifier.
514 static bool DisassemblePseudo(MCInst &MI, unsigned Opcode, uint32_t insn,
515 unsigned short NumOps, unsigned &NumOpsAdded, BO) {
517 assert(0 && "Unexpected pseudo instruction!");
522 // if d == 15 || n == 15 || m == 15 || a == 15 then UNPREDICTABLE;
525 // if d == 15 || n == 15 || m == 15 then UNPREDICTABLE;
528 // if dLo == 15 || dHi == 15 || n == 15 || m == 15 then UNPREDICTABLE;
529 // if dHi == dLo then UNPREDICTABLE;
530 static bool BadRegsMulFrm(unsigned Opcode, uint32_t insn) {
531 unsigned R19_16 = slice(insn, 19, 16);
532 unsigned R15_12 = slice(insn, 15, 12);
533 unsigned R11_8 = slice(insn, 11, 8);
534 unsigned R3_0 = slice(insn, 3, 0);
537 // Did we miss an opcode?
538 DEBUG(errs() << "BadRegsMulFrm: unexpected opcode!");
540 case ARM::MLA: case ARM::MLS: case ARM::SMLABB: case ARM::SMLABT:
541 case ARM::SMLATB: case ARM::SMLATT: case ARM::SMLAWB: case ARM::SMLAWT:
542 case ARM::SMMLA: case ARM::SMMLAR: case ARM::SMMLS: case ARM::SMMLSR:
544 if (R19_16 == 15 || R15_12 == 15 || R11_8 == 15 || R3_0 == 15)
547 case ARM::MUL: case ARM::SMMUL: case ARM::SMMULR:
548 case ARM::SMULBB: case ARM::SMULBT: case ARM::SMULTB: case ARM::SMULTT:
549 case ARM::SMULWB: case ARM::SMULWT: case ARM::SMUAD: case ARM::SMUADX:
550 // A8.6.167 SMLAD & A8.6.172 SMLSD
551 case ARM::SMLAD: case ARM::SMLADX: case ARM::SMLSD: case ARM::SMLSDX:
553 if (R19_16 == 15 || R11_8 == 15 || R3_0 == 15)
556 case ARM::SMLAL: case ARM::SMULL: case ARM::UMAAL: case ARM::UMLAL:
558 case ARM::SMLALBB: case ARM::SMLALBT: case ARM::SMLALTB: case ARM::SMLALTT:
559 case ARM::SMLALD: case ARM::SMLALDX: case ARM::SMLSLD: case ARM::SMLSLDX:
560 if (R19_16 == 15 || R15_12 == 15 || R11_8 == 15 || R3_0 == 15)
562 if (R19_16 == R15_12)
568 // Multiply Instructions.
569 // MLA, MLS, SMLABB, SMLABT, SMLATB, SMLATT, SMLAWB, SMLAWT, SMMLA, SMMLAR,
570 // SMMLS, SMMLAR, SMLAD, SMLADX, SMLSD, SMLSDX, and USADA8 (for convenience):
571 // Rd{19-16} Rn{3-0} Rm{11-8} Ra{15-12}
572 // But note that register checking for {SMLAD, SMLADX, SMLSD, SMLSDX} is
573 // only for {d, n, m}.
575 // MUL, SMMUL, SMMULR, SMULBB, SMULBT, SMULTB, SMULTT, SMULWB, SMULWT, SMUAD,
576 // SMUADX, and USAD8 (for convenience):
577 // Rd{19-16} Rn{3-0} Rm{11-8}
579 // SMLAL, SMULL, UMAAL, UMLAL, UMULL, SMLALBB, SMLALBT, SMLALTB, SMLALTT,
580 // SMLALD, SMLADLX, SMLSLD, SMLSLDX:
581 // RdLo{15-12} RdHi{19-16} Rn{3-0} Rm{11-8}
583 // The mapping of the multiply registers to the "regular" ARM registers, where
584 // there are convenience decoder functions, is:
590 static bool DisassembleMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
591 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
593 const MCInstrDesc &MCID = ARMInsts[Opcode];
594 unsigned short NumDefs = MCID.getNumDefs();
595 const MCOperandInfo *OpInfo = MCID.OpInfo;
596 unsigned &OpIdx = NumOpsAdded;
600 assert(NumDefs > 0 && "NumDefs should be greater than 0 for MulFrm");
602 && OpInfo[0].RegClass == ARM::GPRRegClassID
603 && OpInfo[1].RegClass == ARM::GPRRegClassID
604 && OpInfo[2].RegClass == ARM::GPRRegClassID
605 && "Expect three register operands");
607 // Sanity check for the register encodings.
608 if (BadRegsMulFrm(Opcode, insn))
611 // Instructions with two destination registers have RdLo{15-12} first.
613 assert(NumOps >= 4 && OpInfo[3].RegClass == ARM::GPRRegClassID &&
614 "Expect 4th register operand");
615 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
620 // The destination register: RdHi{19-16} or Rd{19-16}.
621 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
624 // The two src regsiters: Rn{3-0}, then Rm{11-8}.
625 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
627 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
631 // Many multiply instructions (e.g., MLA) have three src registers.
632 // The third register operand is Ra{15-12}.
633 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) {
634 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
642 // Helper routines for disassembly of coprocessor instructions.
644 static bool LdStCopOpcode(unsigned Opcode) {
645 if ((Opcode >= ARM::LDC2L_OFFSET && Opcode <= ARM::LDC_PRE) ||
646 (Opcode >= ARM::STC2L_OFFSET && Opcode <= ARM::STC_PRE))
650 static bool CoprocessorOpcode(unsigned Opcode) {
651 if (LdStCopOpcode(Opcode))
657 case ARM::CDP: case ARM::CDP2:
658 case ARM::MCR: case ARM::MCR2: case ARM::MRC: case ARM::MRC2:
659 case ARM::MCRR: case ARM::MCRR2: case ARM::MRRC: case ARM::MRRC2:
663 static inline unsigned GetCoprocessor(uint32_t insn) {
664 return slice(insn, 11, 8);
666 static inline unsigned GetCopOpc1(uint32_t insn, bool CDP) {
667 return CDP ? slice(insn, 23, 20) : slice(insn, 23, 21);
669 static inline unsigned GetCopOpc2(uint32_t insn) {
670 return slice(insn, 7, 5);
672 static inline unsigned GetCopOpc(uint32_t insn) {
673 return slice(insn, 7, 4);
675 // Most of the operands are in immediate forms, except Rd and Rn, which are ARM
678 // CDP, CDP2: cop opc1 CRd CRn CRm opc2
680 // MCR, MCR2, MRC, MRC2: cop opc1 Rd CRn CRm opc2
682 // MCRR, MCRR2, MRRC, MRRc2: cop opc Rd Rn CRm
684 // LDC_OFFSET, LDC_PRE, LDC_POST: cop CRd Rn R0 [+/-]imm8:00
686 // STC_OFFSET, STC_PRE, STC_POST: cop CRd Rn R0 [+/-]imm8:00
690 // LDC_OPTION: cop CRd Rn imm8
692 // STC_OPTION: cop CRd Rn imm8
695 static bool DisassembleCoprocessor(MCInst &MI, unsigned Opcode, uint32_t insn,
696 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
698 assert(NumOps >= 4 && "Num of operands >= 4 for coprocessor instr");
700 unsigned &OpIdx = NumOpsAdded;
702 // if coproc == '101x' then SEE "Advanced SIMD and VFP"
703 // But since the special instructions have more explicit encoding bits
704 // specified, if coproc == 10 or 11, we should reject it as invalid.
705 unsigned coproc = GetCoprocessor(insn);
706 if ((Opcode == ARM::MCR || Opcode == ARM::MCRR ||
707 Opcode == ARM::MRC || Opcode == ARM::MRRC) &&
708 (coproc == 10 || coproc == 11)) {
709 DEBUG(errs() << "Encoding error: coproc == 10 or 11 for MCR[R]/MR[R]C\n");
713 bool OneCopOpc = (Opcode == ARM::MCRR || Opcode == ARM::MCRR2 ||
714 Opcode == ARM::MRRC || Opcode == ARM::MRRC2);
716 // CDP/CDP2 has no GPR operand; the opc1 operand is also wider (Inst{23-20}).
717 bool NoGPR = (Opcode == ARM::CDP || Opcode == ARM::CDP2);
718 bool LdStCop = LdStCopOpcode(Opcode);
719 bool RtOut = (Opcode == ARM::MRC || Opcode == ARM::MRC2);
724 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
728 MI.addOperand(MCOperand::CreateImm(coproc));
732 // Unindex if P:W = 0b00 --> _OPTION variant
733 unsigned PW = getPBit(insn) << 1 | getWBit(insn);
735 MI.addOperand(MCOperand::CreateImm(decodeRd(insn)));
737 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
742 MI.addOperand(MCOperand::CreateReg(0));
743 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
744 const MCInstrDesc &MCID = ARMInsts[Opcode];
746 (MCID.TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift;
747 unsigned Offset = ARM_AM::getAM2Opc(AddrOpcode, slice(insn, 7, 0) << 2,
748 ARM_AM::no_shift, IndexMode);
749 MI.addOperand(MCOperand::CreateImm(Offset));
752 MI.addOperand(MCOperand::CreateImm(slice(insn, 7, 0)));
756 MI.addOperand(MCOperand::CreateImm(OneCopOpc ? GetCopOpc(insn)
757 : GetCopOpc1(insn, NoGPR)));
761 MI.addOperand(NoGPR ? MCOperand::CreateImm(decodeRd(insn))
762 : MCOperand::CreateReg(
763 getRegisterEnum(B, ARM::GPRRegClassID,
768 MI.addOperand(OneCopOpc ? MCOperand::CreateReg(
769 getRegisterEnum(B, ARM::GPRRegClassID,
771 : MCOperand::CreateImm(decodeRn(insn)));
773 MI.addOperand(MCOperand::CreateImm(decodeRm(insn)));
778 MI.addOperand(MCOperand::CreateImm(GetCopOpc2(insn)));
786 // Branch Instructions.
787 // BL: SignExtend(Imm24:'00', 32)
788 // Bcc, BL_pred: SignExtend(Imm24:'00', 32) Pred0 Pred1
789 // SMC: ZeroExtend(imm4, 32)
790 // SVC: ZeroExtend(Imm24, 32)
792 // Various coprocessor instructions are assigned BrFrm arbitrarily.
793 // Delegates to DisassembleCoprocessor() helper function.
796 // MSR/MSRsys: Rm mask=Inst{19-16}
798 // MSRi/MSRsysi: so_imm
799 // SRSW/SRS: ldstm_mode:$amode mode_imm
800 // RFEW/RFE: ldstm_mode:$amode Rn
801 static bool DisassembleBrFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
802 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
804 if (CoprocessorOpcode(Opcode))
805 return DisassembleCoprocessor(MI, Opcode, insn, NumOps, NumOpsAdded, B);
807 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
808 if (!OpInfo) return false;
810 // MRS and MRSsys take one GPR reg Rd.
811 if (Opcode == ARM::MRS || Opcode == ARM::MRSsys) {
812 assert(NumOps >= 1 && OpInfo[0].RegClass == ARM::GPRRegClassID &&
813 "Reg operand expected");
814 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
819 // BXJ takes one GPR reg Rm.
820 if (Opcode == ARM::BXJ) {
821 assert(NumOps >= 1 && OpInfo[0].RegClass == ARM::GPRRegClassID &&
822 "Reg operand expected");
823 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
828 // MSR take a mask, followed by one GPR reg Rm. The mask contains the R Bit in
829 // bit 4, and the special register fields in bits 3-0.
830 if (Opcode == ARM::MSR) {
831 assert(NumOps >= 1 && OpInfo[1].RegClass == ARM::GPRRegClassID &&
832 "Reg operand expected");
833 MI.addOperand(MCOperand::CreateImm(slice(insn, 22, 22) << 4 /* R Bit */ |
834 slice(insn, 19, 16) /* Special Reg */ ));
835 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
840 // MSRi take a mask, followed by one so_imm operand. The mask contains the
841 // R Bit in bit 4, and the special register fields in bits 3-0.
842 if (Opcode == ARM::MSRi) {
843 // A5.2.11 MSR (immediate), and hints & B6.1.6 MSR (immediate)
844 // The hints instructions have more specific encodings, so if mask == 0,
845 // we should reject this as an invalid instruction.
846 if (slice(insn, 19, 16) == 0)
848 MI.addOperand(MCOperand::CreateImm(slice(insn, 22, 22) << 4 /* R Bit */ |
849 slice(insn, 19, 16) /* Special Reg */ ));
850 // SOImm is 4-bit rotate amount in bits 11-8 with 8-bit imm in bits 7-0.
851 // A5.2.4 Rotate amount is twice the numeric value of Inst{11-8}.
852 // See also ARMAddressingModes.h: getSOImmValImm() and getSOImmValRot().
853 unsigned Rot = (insn >> ARMII::SoRotImmShift) & 0xF;
854 unsigned Imm = insn & 0xFF;
855 MI.addOperand(MCOperand::CreateImm(ARM_AM::rotr32(Imm, 2*Rot)));
859 if (Opcode == ARM::SRSW || Opcode == ARM::SRS ||
860 Opcode == ARM::RFEW || Opcode == ARM::RFE) {
861 ARM_AM::AMSubMode SubMode = getAMSubModeForBits(getPUBits(insn));
862 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM4ModeImm(SubMode)));
864 if (Opcode == ARM::SRSW || Opcode == ARM::SRS)
865 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0)));
867 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
873 assert((Opcode == ARM::Bcc || Opcode == ARM::BL || Opcode == ARM::BL_pred
874 || Opcode == ARM::SMC || Opcode == ARM::SVC) &&
875 "Unexpected Opcode");
877 assert(NumOps >= 1 && OpInfo[0].RegClass < 0 && "Imm operand expected");
880 if (Opcode == ARM::SMC) {
881 // ZeroExtend(imm4, 32) where imm24 = Inst{3-0}.
882 Imm32 = slice(insn, 3, 0);
883 } else if (Opcode == ARM::SVC) {
884 // ZeroExtend(imm24, 32) where imm24 = Inst{23-0}.
885 Imm32 = slice(insn, 23, 0);
887 // SignExtend(imm24:'00', 32) where imm24 = Inst{23-0}.
888 unsigned Imm26 = slice(insn, 23, 0) << 2;
889 //Imm32 = signextend<signed int, 26>(Imm26);
890 Imm32 = SignExtend32<26>(Imm26);
893 MI.addOperand(MCOperand::CreateImm(Imm32));
899 // Misc. Branch Instructions.
901 // BLX, BLX_pred, BX, BX_pred
903 static bool DisassembleBrMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
904 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
906 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
907 if (!OpInfo) return false;
909 unsigned &OpIdx = NumOpsAdded;
913 // BX_RET and MOVPCLR have only two predicate operands; do an early return.
914 if (Opcode == ARM::BX_RET || Opcode == ARM::MOVPCLR)
917 // BLX and BX take one GPR reg.
918 if (Opcode == ARM::BLX || Opcode == ARM::BLX_pred ||
919 Opcode == ARM::BX || Opcode == ARM::BX_pred) {
920 assert(NumOps >= 1 && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
921 "Reg operand expected");
922 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
928 // BLXi takes imm32 (the PC offset).
929 if (Opcode == ARM::BLXi) {
930 assert(NumOps >= 1 && OpInfo[0].RegClass < 0 && "Imm operand expected");
931 // SignExtend(imm24:H:'0', 32) where imm24 = Inst{23-0} and H = Inst{24}.
932 unsigned Imm26 = slice(insn, 23, 0) << 2 | slice(insn, 24, 24) << 1;
933 int Imm32 = SignExtend32<26>(Imm26);
934 MI.addOperand(MCOperand::CreateImm(Imm32));
942 static inline bool getBFCInvMask(uint32_t insn, uint32_t &mask) {
943 uint32_t lsb = slice(insn, 11, 7);
944 uint32_t msb = slice(insn, 20, 16);
947 DEBUG(errs() << "Encoding error: msb < lsb\n");
951 for (uint32_t i = lsb; i <= msb; ++i)
957 // Standard data-processing instructions allow PC as a register specifier,
958 // but we should reject other DPFrm instructions with PC as registers.
959 static bool BadRegsDPFrm(unsigned Opcode, uint32_t insn) {
962 // Did we miss an opcode?
963 if (decodeRd(insn) == 15 || decodeRn(insn) == 15 || decodeRm(insn) == 15) {
964 DEBUG(errs() << "DPFrm with bad reg specifier(s)\n");
967 case ARM::ADCrr: case ARM::ADDSrr: case ARM::ADDrr: case ARM::ANDrr:
968 case ARM::BICrr: case ARM::CMNzrr: case ARM::CMPrr: case ARM::EORrr:
969 case ARM::ORRrr: case ARM::RSBrr: case ARM::RSCrr: case ARM::SBCrr:
970 case ARM::SUBSrr: case ARM::SUBrr: case ARM::TEQrr: case ARM::TSTrr:
975 // A major complication is the fact that some of the saturating add/subtract
976 // operations have Rd Rm Rn, instead of the "normal" Rd Rn Rm.
977 // They are QADD, QDADD, QDSUB, and QSUB.
978 static bool DisassembleDPFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
979 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
981 const MCInstrDesc &MCID = ARMInsts[Opcode];
982 unsigned short NumDefs = MCID.getNumDefs();
983 bool isUnary = isUnaryDP(MCID.TSFlags);
984 const MCOperandInfo *OpInfo = MCID.OpInfo;
985 unsigned &OpIdx = NumOpsAdded;
989 // Disassemble register def if there is one.
990 if (NumDefs && (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID)) {
991 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
996 // Now disassemble the src operands.
1000 // Special-case handling of BFC/BFI/SBFX/UBFX.
1001 if (Opcode == ARM::BFC || Opcode == ARM::BFI) {
1002 // A8.6.17 BFC & A8.6.18 BFI
1004 if (decodeRd(insn) == 15)
1006 MI.addOperand(MCOperand::CreateReg(0));
1007 if (Opcode == ARM::BFI) {
1008 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1013 if (!getBFCInvMask(insn, mask))
1016 MI.addOperand(MCOperand::CreateImm(mask));
1020 if (Opcode == ARM::SBFX || Opcode == ARM::UBFX) {
1021 // Sanity check Rd and Rm.
1022 if (decodeRd(insn) == 15 || decodeRm(insn) == 15)
1024 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1026 MI.addOperand(MCOperand::CreateImm(slice(insn, 11, 7)));
1027 MI.addOperand(MCOperand::CreateImm(slice(insn, 20, 16) + 1));
1032 bool RmRn = (Opcode == ARM::QADD || Opcode == ARM::QDADD ||
1033 Opcode == ARM::QDSUB || Opcode == ARM::QSUB);
1035 // BinaryDP has an Rn operand.
1037 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1038 "Reg operand expected");
1039 MI.addOperand(MCOperand::CreateReg(
1040 getRegisterEnum(B, ARM::GPRRegClassID,
1041 RmRn ? decodeRm(insn) : decodeRn(insn))));
1045 // If this is a two-address operand, skip it, e.g., MOVCCr operand 1.
1046 if (isUnary && (MCID.getOperandConstraint(OpIdx, MCOI::TIED_TO) != -1)) {
1047 MI.addOperand(MCOperand::CreateReg(0));
1051 // Now disassemble operand 2.
1052 if (OpIdx >= NumOps)
1055 if (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) {
1056 // We have a reg/reg form.
1057 // Assert disabled because saturating operations, e.g., A8.6.127 QASX, are
1058 // routed here as well.
1059 // assert(getIBit(insn) == 0 && "I_Bit != '0' reg/reg form");
1060 if (BadRegsDPFrm(Opcode, insn))
1062 MI.addOperand(MCOperand::CreateReg(
1063 getRegisterEnum(B, ARM::GPRRegClassID,
1064 RmRn? decodeRn(insn) : decodeRm(insn))));
1066 } else if (Opcode == ARM::MOVi16 || Opcode == ARM::MOVTi16) {
1067 // These two instructions don't allow d as 15.
1068 if (decodeRd(insn) == 15)
1070 // We have an imm16 = imm4:imm12 (imm4=Inst{19:16}, imm12 = Inst{11:0}).
1071 assert(getIBit(insn) == 1 && "I_Bit != '1' reg/imm form");
1072 unsigned Imm16 = slice(insn, 19, 16) << 12 | slice(insn, 11, 0);
1073 if (!B->tryAddingSymbolicOperand(Imm16, 4, MI))
1074 MI.addOperand(MCOperand::CreateImm(Imm16));
1077 // We have a reg/imm form.
1078 // SOImm is 4-bit rotate amount in bits 11-8 with 8-bit imm in bits 7-0.
1079 // A5.2.4 Rotate amount is twice the numeric value of Inst{11-8}.
1080 // See also ARMAddressingModes.h: getSOImmValImm() and getSOImmValRot().
1081 assert(getIBit(insn) == 1 && "I_Bit != '1' reg/imm form");
1082 unsigned Rot = (insn >> ARMII::SoRotImmShift) & 0xF;
1083 unsigned Imm = insn & 0xFF;
1084 MI.addOperand(MCOperand::CreateImm(ARM_AM::rotr32(Imm, 2*Rot)));
1091 static bool DisassembleDPSoRegFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1092 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1094 const MCInstrDesc &MCID = ARMInsts[Opcode];
1095 unsigned short NumDefs = MCID.getNumDefs();
1096 bool isUnary = isUnaryDP(MCID.TSFlags);
1097 const MCOperandInfo *OpInfo = MCID.OpInfo;
1098 unsigned &OpIdx = NumOpsAdded;
1102 // Disassemble register def if there is one.
1103 if (NumDefs && (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID)) {
1104 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1109 // Disassemble the src operands.
1110 if (OpIdx >= NumOps)
1113 // BinaryDP has an Rn operand.
1115 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1116 "Reg operand expected");
1117 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1122 // If this is a two-address operand, skip it, e.g., MOVCCs operand 1.
1123 if (isUnary && (MCID.getOperandConstraint(OpIdx, MCOI::TIED_TO) != -1)) {
1124 MI.addOperand(MCOperand::CreateReg(0));
1128 // Disassemble operand 2, which consists of three components.
1129 if (OpIdx + 2 >= NumOps)
1132 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
1133 (OpInfo[OpIdx+1].RegClass == ARM::GPRRegClassID) &&
1134 (OpInfo[OpIdx+2].RegClass < 0) &&
1135 "Expect 3 reg operands");
1137 // Register-controlled shifts have Inst{7} = 0 and Inst{4} = 1.
1138 unsigned Rs = slice(insn, 4, 4);
1140 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1143 // If Inst{7} != 0, we should reject this insn as an invalid encoding.
1144 if (slice(insn, 7, 7))
1147 // A8.6.3 ADC (register-shifted register)
1148 // if d == 15 || n == 15 || m == 15 || s == 15 then UNPREDICTABLE;
1150 // This also accounts for shift instructions (register) where, fortunately,
1151 // Inst{19-16} = 0b0000.
1152 // A8.6.89 LSL (register)
1153 // if d == 15 || n == 15 || m == 15 then UNPREDICTABLE;
1154 if (decodeRd(insn) == 15 || decodeRn(insn) == 15 ||
1155 decodeRm(insn) == 15 || decodeRs(insn) == 15)
1158 // Register-controlled shifts: [Rm, Rs, shift].
1159 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1161 // Inst{6-5} encodes the shift opcode.
1162 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1163 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(ShOp, 0)));
1165 // Constant shifts: [Rm, reg0, shift_imm].
1166 MI.addOperand(MCOperand::CreateReg(0)); // NoRegister
1167 // Inst{6-5} encodes the shift opcode.
1168 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1169 // Inst{11-7} encodes the imm5 shift amount.
1170 unsigned ShImm = slice(insn, 11, 7);
1172 // A8.4.1. Possible rrx or shift amount of 32...
1173 getImmShiftSE(ShOp, ShImm);
1174 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(ShOp, ShImm)));
1181 static bool BadRegsLdStFrm(unsigned Opcode, uint32_t insn, bool Store, bool WBack,
1183 const StringRef Name = ARMInsts[Opcode].Name;
1184 unsigned Rt = decodeRd(insn);
1185 unsigned Rn = decodeRn(insn);
1186 unsigned Rm = decodeRm(insn);
1187 unsigned P = getPBit(insn);
1188 unsigned W = getWBit(insn);
1191 // Only STR (immediate, register) allows PC as the source.
1192 if (Name.startswith("STRB") && Rt == 15) {
1193 DEBUG(errs() << "if t == 15 then UNPREDICTABLE\n");
1196 if (WBack && (Rn == 15 || Rn == Rt)) {
1197 DEBUG(errs() << "if wback && (n == 15 || n == t) then UNPREDICTABLE\n");
1200 if (!Imm && Rm == 15) {
1201 DEBUG(errs() << "if m == 15 then UNPREDICTABLE\n");
1205 // Only LDR (immediate, register) allows PC as the destination.
1206 if (Name.startswith("LDRB") && Rt == 15) {
1207 DEBUG(errs() << "if t == 15 then UNPREDICTABLE\n");
1213 // The literal form must be in offset mode; it's an encoding error
1215 if (!(P == 1 && W == 0)) {
1216 DEBUG(errs() << "Ld literal form with !(P == 1 && W == 0)\n");
1219 // LDRB (literal) does not allow PC as the destination.
1220 if (Opcode != ARM::LDRi12 && Rt == 15) {
1221 DEBUG(errs() << "if t == 15 then UNPREDICTABLE\n");
1225 // Write back while Rn == Rt does not make sense.
1226 if (WBack && (Rn == Rt)) {
1227 DEBUG(errs() << "if wback && n == t then UNPREDICTABLE\n");
1234 DEBUG(errs() << "if m == 15 then UNPREDICTABLE\n");
1237 if (WBack && (Rn == 15 || Rn == Rt)) {
1238 DEBUG(errs() << "if wback && (n == 15 || n == t) then UNPREDICTABLE\n");
1246 static bool DisassembleLdStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1247 unsigned short NumOps, unsigned &NumOpsAdded, bool isStore, BO B) {
1249 const MCInstrDesc &MCID = ARMInsts[Opcode];
1250 bool isPrePost = isPrePostLdSt(MCID.TSFlags);
1251 const MCOperandInfo *OpInfo = MCID.OpInfo;
1252 if (!OpInfo) return false;
1254 unsigned &OpIdx = NumOpsAdded;
1258 assert(((!isStore && MCID.getNumDefs() > 0) ||
1259 (isStore && (MCID.getNumDefs() == 0 || isPrePost)))
1260 && "Invalid arguments");
1262 // Operand 0 of a pre- and post-indexed store is the address base writeback.
1263 if (isPrePost && isStore) {
1264 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1265 "Reg operand expected");
1266 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1271 // Disassemble the dst/src operand.
1272 if (OpIdx >= NumOps)
1275 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1276 "Reg operand expected");
1277 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1281 // After dst of a pre- and post-indexed load is the address base writeback.
1282 if (isPrePost && !isStore) {
1283 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1284 "Reg operand expected");
1285 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1290 // Disassemble the base operand.
1291 if (OpIdx >= NumOps)
1294 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1295 "Reg operand expected");
1296 assert((!isPrePost || (MCID.getOperandConstraint(OpIdx, MCOI::TIED_TO) != -1))
1297 && "Index mode or tied_to operand expected");
1298 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1302 // For reg/reg form, base reg is followed by +/- reg shop imm.
1303 // For immediate form, it is followed by +/- imm12.
1304 // See also ARMAddressingModes.h (Addressing Mode #2).
1305 if (OpIdx + 1 >= NumOps)
1308 if (BadRegsLdStFrm(Opcode, insn, isStore, isPrePost, getIBit(insn)==0))
1311 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1312 unsigned IndexMode =
1313 (MCID.TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift;
1314 if (getIBit(insn) == 0) {
1315 // For pre- and post-indexed case, add a reg0 operand (Addressing Mode #2).
1316 // Otherwise, skip the reg operand since for addrmode_imm12, Rn has already
1319 MI.addOperand(MCOperand::CreateReg(0));
1323 unsigned Imm12 = slice(insn, 11, 0);
1324 if (Opcode == ARM::LDRBi12 || Opcode == ARM::LDRi12 ||
1325 Opcode == ARM::STRBi12 || Opcode == ARM::STRi12) {
1326 // Disassemble the 12-bit immediate offset, which is the second operand in
1327 // $addrmode_imm12 => (ops GPR:$base, i32imm:$offsimm).
1328 int Offset = AddrOpcode == ARM_AM::add ? 1 * Imm12 : -1 * Imm12;
1329 MI.addOperand(MCOperand::CreateImm(Offset));
1331 // Disassemble the 12-bit immediate offset, which is the second operand in
1332 // $am2offset => (ops GPR, i32imm).
1333 unsigned Offset = ARM_AM::getAM2Opc(AddrOpcode, Imm12, ARM_AM::no_shift,
1335 MI.addOperand(MCOperand::CreateImm(Offset));
1339 // If Inst{25} = 1 and Inst{4} != 0, we should reject this as invalid.
1340 if (slice(insn,4,4) == 1)
1343 // Disassemble the offset reg (Rm), shift type, and immediate shift length.
1344 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1346 // Inst{6-5} encodes the shift opcode.
1347 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1348 // Inst{11-7} encodes the imm5 shift amount.
1349 unsigned ShImm = slice(insn, 11, 7);
1351 // A8.4.1. Possible rrx or shift amount of 32...
1352 getImmShiftSE(ShOp, ShImm);
1353 MI.addOperand(MCOperand::CreateImm(
1354 ARM_AM::getAM2Opc(AddrOpcode, ShImm, ShOp, IndexMode)));
1361 static bool DisassembleLdFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1362 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1363 return DisassembleLdStFrm(MI, Opcode, insn, NumOps, NumOpsAdded, false, B);
1366 static bool DisassembleStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1367 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1368 return DisassembleLdStFrm(MI, Opcode, insn, NumOps, NumOpsAdded, true, B);
1371 static bool HasDualReg(unsigned Opcode) {
1375 case ARM::LDRD: case ARM::LDRD_PRE: case ARM::LDRD_POST:
1376 case ARM::STRD: case ARM::STRD_PRE: case ARM::STRD_POST:
1381 static bool DisassembleLdStMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1382 unsigned short NumOps, unsigned &NumOpsAdded, bool isStore, BO B) {
1384 const MCInstrDesc &MCID = ARMInsts[Opcode];
1385 bool isPrePost = isPrePostLdSt(MCID.TSFlags);
1386 const MCOperandInfo *OpInfo = MCID.OpInfo;
1387 if (!OpInfo) return false;
1389 unsigned &OpIdx = NumOpsAdded;
1393 assert(((!isStore && MCID.getNumDefs() > 0) ||
1394 (isStore && (MCID.getNumDefs() == 0 || isPrePost)))
1395 && "Invalid arguments");
1397 // Operand 0 of a pre- and post-indexed store is the address base writeback.
1398 if (isPrePost && isStore) {
1399 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1400 "Reg operand expected");
1401 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1406 // Disassemble the dst/src operand.
1407 if (OpIdx >= NumOps)
1410 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1411 "Reg operand expected");
1412 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1416 // Fill in LDRD and STRD's second operand Rt operand.
1417 if (HasDualReg(Opcode)) {
1418 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1419 decodeRd(insn) + 1)));
1423 // After dst of a pre- and post-indexed load is the address base writeback.
1424 if (isPrePost && !isStore) {
1425 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1426 "Reg operand expected");
1427 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1432 // Disassemble the base operand.
1433 if (OpIdx >= NumOps)
1436 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1437 "Reg operand expected");
1438 assert((!isPrePost || (MCID.getOperandConstraint(OpIdx, MCOI::TIED_TO) != -1))
1439 && "Offset mode or tied_to operand expected");
1440 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1444 // For reg/reg form, base reg is followed by +/- reg.
1445 // For immediate form, it is followed by +/- imm8.
1446 // See also ARMAddressingModes.h (Addressing Mode #3).
1447 if (OpIdx + 1 >= NumOps)
1450 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
1451 (OpInfo[OpIdx+1].RegClass < 0) &&
1452 "Expect 1 reg operand followed by 1 imm operand");
1454 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1455 unsigned IndexMode =
1456 (MCID.TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift;
1457 if (getAM3IBit(insn) == 1) {
1458 MI.addOperand(MCOperand::CreateReg(0));
1460 // Disassemble the 8-bit immediate offset.
1461 unsigned Imm4H = (insn >> ARMII::ImmHiShift) & 0xF;
1462 unsigned Imm4L = insn & 0xF;
1463 unsigned Offset = ARM_AM::getAM3Opc(AddrOpcode, (Imm4H << 4) | Imm4L,
1465 MI.addOperand(MCOperand::CreateImm(Offset));
1467 // Disassemble the offset reg (Rm).
1468 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1470 unsigned Offset = ARM_AM::getAM3Opc(AddrOpcode, 0, IndexMode);
1471 MI.addOperand(MCOperand::CreateImm(Offset));
1478 static bool DisassembleLdMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1479 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1480 return DisassembleLdStMiscFrm(MI, Opcode, insn, NumOps, NumOpsAdded, false,
1484 static bool DisassembleStMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1485 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1486 return DisassembleLdStMiscFrm(MI, Opcode, insn, NumOps, NumOpsAdded, true, B);
1489 // The algorithm for disassembly of LdStMulFrm is different from others because
1490 // it explicitly populates the two predicate operands after the base register.
1491 // After that, we need to populate the reglist with each affected register
1492 // encoded as an MCOperand.
1493 static bool DisassembleLdStMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1494 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1496 assert(NumOps >= 4 && "LdStMulFrm expects NumOps >= 4");
1499 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1501 // Writeback to base, if necessary.
1502 if (Opcode == ARM::LDMIA_UPD || Opcode == ARM::STMIA_UPD ||
1503 Opcode == ARM::LDMDA_UPD || Opcode == ARM::STMDA_UPD ||
1504 Opcode == ARM::LDMDB_UPD || Opcode == ARM::STMDB_UPD ||
1505 Opcode == ARM::LDMIB_UPD || Opcode == ARM::STMIB_UPD) {
1506 MI.addOperand(MCOperand::CreateReg(Base));
1510 // Add the base register operand.
1511 MI.addOperand(MCOperand::CreateReg(Base));
1513 // Handling the two predicate operands before the reglist.
1514 int64_t CondVal = getCondField(insn);
1517 MI.addOperand(MCOperand::CreateImm(CondVal));
1518 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
1522 // Fill the variadic part of reglist.
1523 unsigned RegListBits = insn & ((1 << 16) - 1);
1524 for (unsigned i = 0; i < 16; ++i) {
1525 if ((RegListBits >> i) & 1) {
1526 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1535 // LDREX, LDREXB, LDREXH: Rd Rn
1536 // LDREXD: Rd Rd+1 Rn
1537 // STREX, STREXB, STREXH: Rd Rm Rn
1538 // STREXD: Rd Rm Rm+1 Rn
1540 // SWP, SWPB: Rd Rm Rn
1541 static bool DisassembleLdStExFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1542 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1544 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1545 if (!OpInfo) return false;
1547 unsigned &OpIdx = NumOpsAdded;
1552 && OpInfo[0].RegClass == ARM::GPRRegClassID
1553 && OpInfo[1].RegClass == ARM::GPRRegClassID
1554 && "Expect 2 reg operands");
1556 bool isStore = slice(insn, 20, 20) == 0;
1557 bool isDW = (Opcode == ARM::LDREXD || Opcode == ARM::STREXD);
1559 // Add the destination operand.
1560 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1564 // Store register Exclusive needs a source operand.
1566 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1571 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1572 decodeRm(insn)+1)));
1576 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1577 decodeRd(insn)+1)));
1581 // Finally add the pointer operand.
1582 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1589 // Misc. Arithmetic Instructions.
1591 // PKHBT, PKHTB: Rd Rn Rm , LSL/ASR #imm5
1592 // RBIT, REV, REV16, REVSH: Rd Rm
1593 static bool DisassembleArithMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1594 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1596 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1597 unsigned &OpIdx = NumOpsAdded;
1602 && OpInfo[0].RegClass == ARM::GPRRegClassID
1603 && OpInfo[1].RegClass == ARM::GPRRegClassID
1604 && "Expect 2 reg operands");
1606 bool ThreeReg = NumOps > 2 && OpInfo[2].RegClass == ARM::GPRRegClassID;
1608 // Sanity check the registers, which should not be 15.
1609 if (decodeRd(insn) == 15 || decodeRm(insn) == 15)
1611 if (ThreeReg && decodeRn(insn) == 15)
1614 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1619 assert(NumOps >= 4 && "Expect >= 4 operands");
1620 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1625 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1629 // If there is still an operand info left which is an immediate operand, add
1630 // an additional imm5 LSL/ASR operand.
1631 if (ThreeReg && OpInfo[OpIdx].RegClass < 0
1632 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1633 // Extract the 5-bit immediate field Inst{11-7}.
1634 unsigned ShiftAmt = (insn >> ARMII::ShiftShift) & 0x1F;
1635 ARM_AM::ShiftOpc Opc = ARM_AM::no_shift;
1636 if (Opcode == ARM::PKHBT)
1638 else if (Opcode == ARM::PKHTB)
1640 getImmShiftSE(Opc, ShiftAmt);
1641 if (Opcode == ARM::PKHBT || Opcode == ARM::PKHTB)
1642 MI.addOperand(MCOperand::CreateImm(ShiftAmt));
1644 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(Opc, ShiftAmt)));
1651 /// DisassembleSatFrm - Disassemble saturate instructions:
1652 /// SSAT, SSAT16, USAT, and USAT16.
1653 static bool DisassembleSatFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1654 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1657 // if d == 15 || n == 15 then UNPREDICTABLE;
1658 if (decodeRd(insn) == 15 || decodeRm(insn) == 15)
1661 const MCInstrDesc &MCID = ARMInsts[Opcode];
1662 NumOpsAdded = MCID.getNumOperands() - 2; // ignore predicate operands
1664 // Disassemble register def.
1665 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1668 unsigned Pos = slice(insn, 20, 16);
1669 if (Opcode == ARM::SSAT || Opcode == ARM::SSAT16)
1671 MI.addOperand(MCOperand::CreateImm(Pos));
1673 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1676 if (NumOpsAdded == 4) {
1677 ARM_AM::ShiftOpc Opc = (slice(insn, 6, 6) != 0 ? ARM_AM::asr : ARM_AM::lsl);
1678 // Inst{11-7} encodes the imm5 shift amount.
1679 unsigned ShAmt = slice(insn, 11, 7);
1681 // A8.6.183. Possible ASR shift amount of 32...
1682 if (Opc == ARM_AM::asr)
1685 Opc = ARM_AM::no_shift;
1687 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(Opc, ShAmt)));
1692 // Extend instructions.
1693 // SXT* and UXT*: Rd [Rn] Rm [rot_imm].
1694 // The 2nd operand register is Rn and the 3rd operand regsiter is Rm for the
1695 // three register operand form. Otherwise, Rn=0b1111 and only Rm is used.
1696 static bool DisassembleExtFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1697 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1700 // if d == 15 || m == 15 then UNPREDICTABLE;
1701 if (decodeRd(insn) == 15 || decodeRm(insn) == 15)
1704 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1705 unsigned &OpIdx = NumOpsAdded;
1710 && OpInfo[0].RegClass == ARM::GPRRegClassID
1711 && OpInfo[1].RegClass == ARM::GPRRegClassID
1712 && "Expect 2 reg operands");
1714 bool ThreeReg = NumOps > 2 && OpInfo[2].RegClass == ARM::GPRRegClassID;
1716 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1721 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1726 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1730 // If there is still an operand info left which is an immediate operand, add
1731 // an additional rotate immediate operand.
1732 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
1733 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1734 // Extract the 2-bit rotate field Inst{11-10}.
1735 unsigned rot = (insn >> ARMII::ExtRotImmShift) & 3;
1736 // Rotation by 8, 16, or 24 bits.
1737 MI.addOperand(MCOperand::CreateImm(rot << 3));
1744 /////////////////////////////////////
1746 // Utility Functions For VFP //
1748 /////////////////////////////////////
1750 // Extract/Decode Dd/Sd:
1752 // SP => d = UInt(Vd:D)
1753 // DP => d = UInt(D:Vd)
1754 static unsigned decodeVFPRd(uint32_t insn, bool isSPVFP) {
1755 return isSPVFP ? (decodeRd(insn) << 1 | getDBit(insn))
1756 : (decodeRd(insn) | getDBit(insn) << 4);
1759 // Extract/Decode Dn/Sn:
1761 // SP => n = UInt(Vn:N)
1762 // DP => n = UInt(N:Vn)
1763 static unsigned decodeVFPRn(uint32_t insn, bool isSPVFP) {
1764 return isSPVFP ? (decodeRn(insn) << 1 | getNBit(insn))
1765 : (decodeRn(insn) | getNBit(insn) << 4);
1768 // Extract/Decode Dm/Sm:
1770 // SP => m = UInt(Vm:M)
1771 // DP => m = UInt(M:Vm)
1772 static unsigned decodeVFPRm(uint32_t insn, bool isSPVFP) {
1773 return isSPVFP ? (decodeRm(insn) << 1 | getMBit(insn))
1774 : (decodeRm(insn) | getMBit(insn) << 4);
1778 static APInt VFPExpandImm(unsigned char byte, unsigned N) {
1779 assert(N == 32 || N == 64);
1782 unsigned bit6 = slice(byte, 6, 6);
1784 Result = slice(byte, 7, 7) << 31 | slice(byte, 5, 0) << 19;
1786 Result |= 0x1f << 25;
1788 Result |= 0x1 << 30;
1790 Result = (uint64_t)slice(byte, 7, 7) << 63 |
1791 (uint64_t)slice(byte, 5, 0) << 48;
1793 Result |= 0xffULL << 54;
1795 Result |= 0x1ULL << 62;
1797 return APInt(N, Result);
1800 // VFP Unary Format Instructions:
1802 // VCMP[E]ZD, VCMP[E]ZS: compares one floating-point register with zero
1803 // VCVTDS, VCVTSD: converts between double-precision and single-precision
1804 // The rest of the instructions have homogeneous [VFP]Rd and [VFP]Rm registers.
1805 static bool DisassembleVFPUnaryFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1806 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1808 assert(NumOps >= 1 && "VFPUnaryFrm expects NumOps >= 1");
1810 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1811 unsigned &OpIdx = NumOpsAdded;
1815 unsigned RegClass = OpInfo[OpIdx].RegClass;
1816 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1817 "Reg operand expected");
1818 bool isSP = (RegClass == ARM::SPRRegClassID);
1820 MI.addOperand(MCOperand::CreateReg(
1821 getRegisterEnum(B, RegClass, decodeVFPRd(insn, isSP))));
1824 // Early return for compare with zero instructions.
1825 if (Opcode == ARM::VCMPEZD || Opcode == ARM::VCMPEZS
1826 || Opcode == ARM::VCMPZD || Opcode == ARM::VCMPZS)
1829 RegClass = OpInfo[OpIdx].RegClass;
1830 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1831 "Reg operand expected");
1832 isSP = (RegClass == ARM::SPRRegClassID);
1834 MI.addOperand(MCOperand::CreateReg(
1835 getRegisterEnum(B, RegClass, decodeVFPRm(insn, isSP))));
1841 // All the instructions have homogeneous [VFP]Rd, [VFP]Rn, and [VFP]Rm regs.
1842 // Some of them have operand constraints which tie the first operand in the
1843 // InOperandList to that of the dst. As far as asm printing is concerned, this
1844 // tied_to operand is simply skipped.
1845 static bool DisassembleVFPBinaryFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1846 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1848 assert(NumOps >= 3 && "VFPBinaryFrm expects NumOps >= 3");
1850 const MCInstrDesc &MCID = ARMInsts[Opcode];
1851 const MCOperandInfo *OpInfo = MCID.OpInfo;
1852 unsigned &OpIdx = NumOpsAdded;
1856 unsigned RegClass = OpInfo[OpIdx].RegClass;
1857 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1858 "Reg operand expected");
1859 bool isSP = (RegClass == ARM::SPRRegClassID);
1861 MI.addOperand(MCOperand::CreateReg(
1862 getRegisterEnum(B, RegClass, decodeVFPRd(insn, isSP))));
1865 // Skip tied_to operand constraint.
1866 if (MCID.getOperandConstraint(OpIdx, MCOI::TIED_TO) != -1) {
1867 assert(NumOps >= 4 && "Expect >=4 operands");
1868 MI.addOperand(MCOperand::CreateReg(0));
1872 MI.addOperand(MCOperand::CreateReg(
1873 getRegisterEnum(B, RegClass, decodeVFPRn(insn, isSP))));
1876 MI.addOperand(MCOperand::CreateReg(
1877 getRegisterEnum(B, RegClass, decodeVFPRm(insn, isSP))));
1883 // A8.6.295 vcvt (floating-point <-> integer)
1884 // Int to FP: VSITOD, VSITOS, VUITOD, VUITOS
1885 // FP to Int: VTOSI[Z|R]D, VTOSI[Z|R]S, VTOUI[Z|R]D, VTOUI[Z|R]S
1887 // A8.6.297 vcvt (floating-point and fixed-point)
1888 // Dd|Sd Dd|Sd(TIED_TO) #fbits(= 16|32 - UInt(imm4:i))
1889 static bool DisassembleVFPConv1Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1890 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1892 assert(NumOps >= 2 && "VFPConv1Frm expects NumOps >= 2");
1894 const MCInstrDesc &MCID = ARMInsts[Opcode];
1895 const MCOperandInfo *OpInfo = MCID.OpInfo;
1896 if (!OpInfo) return false;
1898 bool SP = slice(insn, 8, 8) == 0; // A8.6.295 & A8.6.297
1899 bool fixed_point = slice(insn, 17, 17) == 1; // A8.6.297
1900 unsigned RegClassID = SP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1904 assert(NumOps >= 3 && "Expect >= 3 operands");
1905 int size = slice(insn, 7, 7) == 0 ? 16 : 32;
1906 int fbits = size - (slice(insn,3,0) << 1 | slice(insn,5,5));
1907 MI.addOperand(MCOperand::CreateReg(
1908 getRegisterEnum(B, RegClassID,
1909 decodeVFPRd(insn, SP))));
1911 assert(MCID.getOperandConstraint(1, MCOI::TIED_TO) != -1 &&
1912 "Tied to operand expected");
1913 MI.addOperand(MI.getOperand(0));
1915 assert(OpInfo[2].RegClass < 0 && !OpInfo[2].isPredicate() &&
1916 !OpInfo[2].isOptionalDef() && "Imm operand expected");
1917 MI.addOperand(MCOperand::CreateImm(fbits));
1922 // The Rd (destination) and Rm (source) bits have different interpretations
1923 // depending on their single-precisonness.
1925 if (slice(insn, 18, 18) == 1) { // to_integer operation
1926 d = decodeVFPRd(insn, true /* Is Single Precision */);
1927 MI.addOperand(MCOperand::CreateReg(
1928 getRegisterEnum(B, ARM::SPRRegClassID, d)));
1929 m = decodeVFPRm(insn, SP);
1930 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, m)));
1932 d = decodeVFPRd(insn, SP);
1933 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, d)));
1934 m = decodeVFPRm(insn, true /* Is Single Precision */);
1935 MI.addOperand(MCOperand::CreateReg(
1936 getRegisterEnum(B, ARM::SPRRegClassID, m)));
1944 // VMOVRS - A8.6.330
1945 // Rt => Rd; Sn => UInt(Vn:N)
1946 static bool DisassembleVFPConv2Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1947 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1949 assert(NumOps >= 2 && "VFPConv2Frm expects NumOps >= 2");
1951 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1953 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1954 decodeVFPRn(insn, true))));
1959 // VMOVRRD - A8.6.332
1960 // Rt => Rd; Rt2 => Rn; Dm => UInt(M:Vm)
1962 // VMOVRRS - A8.6.331
1963 // Rt => Rd; Rt2 => Rn; Sm => UInt(Vm:M); Sm1 = Sm+1
1964 static bool DisassembleVFPConv3Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1965 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1967 assert(NumOps >= 3 && "VFPConv3Frm expects NumOps >= 3");
1969 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1970 unsigned &OpIdx = NumOpsAdded;
1972 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1974 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1978 if (OpInfo[OpIdx].RegClass == ARM::SPRRegClassID) {
1979 unsigned Sm = decodeVFPRm(insn, true);
1980 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1982 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1986 MI.addOperand(MCOperand::CreateReg(
1987 getRegisterEnum(B, ARM::DPRRegClassID,
1988 decodeVFPRm(insn, false))));
1994 // VMOVSR - A8.6.330
1995 // Rt => Rd; Sn => UInt(Vn:N)
1996 static bool DisassembleVFPConv4Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1997 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1999 assert(NumOps >= 2 && "VFPConv4Frm expects NumOps >= 2");
2001 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
2002 decodeVFPRn(insn, true))));
2003 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2009 // VMOVDRR - A8.6.332
2010 // Rt => Rd; Rt2 => Rn; Dm => UInt(M:Vm)
2012 // VMOVRRS - A8.6.331
2013 // Rt => Rd; Rt2 => Rn; Sm => UInt(Vm:M); Sm1 = Sm+1
2014 static bool DisassembleVFPConv5Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
2015 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2017 assert(NumOps >= 3 && "VFPConv5Frm expects NumOps >= 3");
2019 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
2020 unsigned &OpIdx = NumOpsAdded;
2024 if (OpInfo[OpIdx].RegClass == ARM::SPRRegClassID) {
2025 unsigned Sm = decodeVFPRm(insn, true);
2026 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
2028 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
2032 MI.addOperand(MCOperand::CreateReg(
2033 getRegisterEnum(B, ARM::DPRRegClassID,
2034 decodeVFPRm(insn, false))));
2038 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2040 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2046 // VFP Load/Store Instructions.
2047 // VLDRD, VLDRS, VSTRD, VSTRS
2048 static bool DisassembleVFPLdStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2049 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2051 assert(NumOps >= 3 && "VFPLdStFrm expects NumOps >= 3");
2053 bool isSPVFP = (Opcode == ARM::VLDRS || Opcode == ARM::VSTRS);
2054 unsigned RegClassID = isSPVFP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
2056 // Extract Dd/Sd for operand 0.
2057 unsigned RegD = decodeVFPRd(insn, isSPVFP);
2059 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, RegD)));
2061 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
2062 MI.addOperand(MCOperand::CreateReg(Base));
2064 // Next comes the AM5 Opcode.
2065 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
2066 unsigned char Imm8 = insn & 0xFF;
2067 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(AddrOpcode, Imm8)));
2074 // VFP Load/Store Multiple Instructions.
2075 // We have an optional write back reg, the base, and two predicate operands.
2076 // It is then followed by a reglist of either DPR(s) or SPR(s).
2078 // VLDMD[_UPD], VLDMS[_UPD], VSTMD[_UPD], VSTMS[_UPD]
2079 static bool DisassembleVFPLdStMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2080 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2082 assert(NumOps >= 4 && "VFPLdStMulFrm expects NumOps >= 4");
2084 unsigned &OpIdx = NumOpsAdded;
2088 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
2090 // Writeback to base, if necessary.
2091 if (Opcode == ARM::VLDMDIA_UPD || Opcode == ARM::VLDMSIA_UPD ||
2092 Opcode == ARM::VLDMDDB_UPD || Opcode == ARM::VLDMSDB_UPD ||
2093 Opcode == ARM::VSTMDIA_UPD || Opcode == ARM::VSTMSIA_UPD ||
2094 Opcode == ARM::VSTMDDB_UPD || Opcode == ARM::VSTMSDB_UPD) {
2095 MI.addOperand(MCOperand::CreateReg(Base));
2099 MI.addOperand(MCOperand::CreateReg(Base));
2101 // Handling the two predicate operands before the reglist.
2102 int64_t CondVal = getCondField(insn);
2105 MI.addOperand(MCOperand::CreateImm(CondVal));
2106 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
2110 bool isSPVFP = (Opcode == ARM::VLDMSIA ||
2111 Opcode == ARM::VLDMSIA_UPD || Opcode == ARM::VLDMSDB_UPD ||
2112 Opcode == ARM::VSTMSIA ||
2113 Opcode == ARM::VSTMSIA_UPD || Opcode == ARM::VSTMSDB_UPD);
2114 unsigned RegClassID = isSPVFP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
2117 unsigned RegD = decodeVFPRd(insn, isSPVFP);
2119 // Fill the variadic part of reglist.
2120 unsigned char Imm8 = insn & 0xFF;
2121 unsigned Regs = isSPVFP ? Imm8 : Imm8/2;
2123 // Apply some sanity checks before proceeding.
2124 if (Regs == 0 || (RegD + Regs) > 32 || (!isSPVFP && Regs > 16))
2127 for (unsigned i = 0; i < Regs; ++i) {
2128 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID,
2136 // Misc. VFP Instructions.
2137 // FMSTAT (vmrs with Rt=0b1111, i.e., to apsr_nzcv and no register operand)
2138 // FCONSTD (DPR and a VFPf64Imm operand)
2139 // FCONSTS (SPR and a VFPf32Imm operand)
2140 // VMRS/VMSR (GPR operand)
2141 static bool DisassembleVFPMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2142 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2144 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
2145 unsigned &OpIdx = NumOpsAdded;
2149 if (Opcode == ARM::FMSTAT)
2152 assert(NumOps >= 2 && "VFPMiscFrm expects >=2 operands");
2154 unsigned RegEnum = 0;
2155 switch (OpInfo[0].RegClass) {
2156 case ARM::DPRRegClassID:
2157 RegEnum = getRegisterEnum(B, ARM::DPRRegClassID, decodeVFPRd(insn, false));
2159 case ARM::SPRRegClassID:
2160 RegEnum = getRegisterEnum(B, ARM::SPRRegClassID, decodeVFPRd(insn, true));
2162 case ARM::GPRRegClassID:
2163 RegEnum = getRegisterEnum(B, ARM::GPRRegClassID, decodeRd(insn));
2166 assert(0 && "Invalid reg class id");
2170 MI.addOperand(MCOperand::CreateReg(RegEnum));
2173 // Extract/decode the f64/f32 immediate.
2174 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2175 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2176 // The asm syntax specifies the floating point value, not the 8-bit literal.
2177 APInt immRaw = VFPExpandImm(slice(insn,19,16) << 4 | slice(insn, 3, 0),
2178 Opcode == ARM::FCONSTD ? 64 : 32);
2179 APFloat immFP = APFloat(immRaw, true);
2180 double imm = Opcode == ARM::FCONSTD ? immFP.convertToDouble() :
2181 immFP.convertToFloat();
2182 MI.addOperand(MCOperand::CreateFPImm(imm));
2190 // DisassembleThumbFrm() is defined in ThumbDisassemblerCore.h file.
2191 #include "ThumbDisassemblerCore.h"
2193 /////////////////////////////////////////////////////
2195 // Utility Functions For ARM Advanced SIMD //
2197 /////////////////////////////////////////////////////
2199 // The following NEON namings are based on A8.6.266 VABA, VABAL. Notice that
2200 // A8.6.303 VDUP (ARM core register)'s D/Vd pair is the N/Vn pair of VABA/VABAL.
2202 // A7.3 Register encoding
2204 // Extract/Decode NEON D/Vd:
2206 // Note that for quadword, Qd = UInt(D:Vd<3:1>) = Inst{22:15-13}, whereas for
2207 // doubleword, Dd = UInt(D:Vd). We compensate for this difference by
2208 // handling it in the getRegisterEnum() utility function.
2209 // D = Inst{22}, Vd = Inst{15-12}
2210 static unsigned decodeNEONRd(uint32_t insn) {
2211 return ((insn >> ARMII::NEON_D_BitShift) & 1) << 4
2212 | ((insn >> ARMII::NEON_RegRdShift) & ARMII::NEONRegMask);
2215 // Extract/Decode NEON N/Vn:
2217 // Note that for quadword, Qn = UInt(N:Vn<3:1>) = Inst{7:19-17}, whereas for
2218 // doubleword, Dn = UInt(N:Vn). We compensate for this difference by
2219 // handling it in the getRegisterEnum() utility function.
2220 // N = Inst{7}, Vn = Inst{19-16}
2221 static unsigned decodeNEONRn(uint32_t insn) {
2222 return ((insn >> ARMII::NEON_N_BitShift) & 1) << 4
2223 | ((insn >> ARMII::NEON_RegRnShift) & ARMII::NEONRegMask);
2226 // Extract/Decode NEON M/Vm:
2228 // Note that for quadword, Qm = UInt(M:Vm<3:1>) = Inst{5:3-1}, whereas for
2229 // doubleword, Dm = UInt(M:Vm). We compensate for this difference by
2230 // handling it in the getRegisterEnum() utility function.
2231 // M = Inst{5}, Vm = Inst{3-0}
2232 static unsigned decodeNEONRm(uint32_t insn) {
2233 return ((insn >> ARMII::NEON_M_BitShift) & 1) << 4
2234 | ((insn >> ARMII::NEON_RegRmShift) & ARMII::NEONRegMask);
2245 } // End of unnamed namespace
2247 // size field -> Inst{11-10}
2248 // index_align field -> Inst{7-4}
2250 // The Lane Index interpretation depends on the Data Size:
2251 // 8 (encoded as size = 0b00) -> Index = index_align[3:1]
2252 // 16 (encoded as size = 0b01) -> Index = index_align[3:2]
2253 // 32 (encoded as size = 0b10) -> Index = index_align[3]
2255 // Ref: A8.6.317 VLD4 (single 4-element structure to one lane).
2256 static unsigned decodeLaneIndex(uint32_t insn) {
2257 unsigned size = insn >> 10 & 3;
2258 assert((size == 0 || size == 1 || size == 2) &&
2259 "Encoding error: size should be either 0, 1, or 2");
2261 unsigned index_align = insn >> 4 & 0xF;
2262 return (index_align >> 1) >> size;
2265 // imm64 = AdvSIMDExpandImm(op, cmode, i:imm3:imm4)
2266 // op = Inst{5}, cmode = Inst{11-8}
2267 // i = Inst{24} (ARM architecture)
2268 // imm3 = Inst{18-16}, imm4 = Inst{3-0}
2269 // Ref: Table A7-15 Modified immediate values for Advanced SIMD instructions.
2270 static uint64_t decodeN1VImm(uint32_t insn, ElemSize esize) {
2271 unsigned char op = (insn >> 5) & 1;
2272 unsigned char cmode = (insn >> 8) & 0xF;
2273 unsigned char Imm8 = ((insn >> 24) & 1) << 7 |
2274 ((insn >> 16) & 7) << 4 |
2276 return (op << 12) | (cmode << 8) | Imm8;
2279 // A8.6.339 VMUL, VMULL (by scalar)
2280 // ESize16 => m = Inst{2-0} (Vm<2:0>) D0-D7
2281 // ESize32 => m = Inst{3-0} (Vm<3:0>) D0-D15
2282 static unsigned decodeRestrictedDm(uint32_t insn, ElemSize esize) {
2289 assert(0 && "Unreachable code!");
2294 // A8.6.339 VMUL, VMULL (by scalar)
2295 // ESize16 => index = Inst{5:3} (M:Vm<3>) D0-D7
2296 // ESize32 => index = Inst{5} (M) D0-D15
2297 static unsigned decodeRestrictedDmIndex(uint32_t insn, ElemSize esize) {
2300 return (((insn >> 5) & 1) << 1) | ((insn >> 3) & 1);
2302 return (insn >> 5) & 1;
2304 assert(0 && "Unreachable code!");
2309 // A8.6.296 VCVT (between floating-point and fixed-point, Advanced SIMD)
2310 // (64 - <fbits>) is encoded as imm6, i.e., Inst{21-16}.
2311 static unsigned decodeVCVTFractionBits(uint32_t insn) {
2312 return 64 - ((insn >> 16) & 0x3F);
2315 // A8.6.302 VDUP (scalar)
2316 // ESize8 => index = Inst{19-17}
2317 // ESize16 => index = Inst{19-18}
2318 // ESize32 => index = Inst{19}
2319 static unsigned decodeNVLaneDupIndex(uint32_t insn, ElemSize esize) {
2322 return (insn >> 17) & 7;
2324 return (insn >> 18) & 3;
2326 return (insn >> 19) & 1;
2328 assert(0 && "Unspecified element size!");
2333 // A8.6.328 VMOV (ARM core register to scalar)
2334 // A8.6.329 VMOV (scalar to ARM core register)
2335 // ESize8 => index = Inst{21:6-5}
2336 // ESize16 => index = Inst{21:6}
2337 // ESize32 => index = Inst{21}
2338 static unsigned decodeNVLaneOpIndex(uint32_t insn, ElemSize esize) {
2341 return ((insn >> 21) & 1) << 2 | ((insn >> 5) & 3);
2343 return ((insn >> 21) & 1) << 1 | ((insn >> 6) & 1);
2345 return ((insn >> 21) & 1);
2347 assert(0 && "Unspecified element size!");
2352 // Imm6 = Inst{21-16}, L = Inst{7}
2354 // LeftShift == true (A8.6.367 VQSHL, A8.6.387 VSLI):
2356 // '0001xxx' => esize = 8; shift_amount = imm6 - 8
2357 // '001xxxx' => esize = 16; shift_amount = imm6 - 16
2358 // '01xxxxx' => esize = 32; shift_amount = imm6 - 32
2359 // '1xxxxxx' => esize = 64; shift_amount = imm6
2361 // LeftShift == false (A8.6.376 VRSHR, A8.6.368 VQSHRN):
2363 // '0001xxx' => esize = 8; shift_amount = 16 - imm6
2364 // '001xxxx' => esize = 16; shift_amount = 32 - imm6
2365 // '01xxxxx' => esize = 32; shift_amount = 64 - imm6
2366 // '1xxxxxx' => esize = 64; shift_amount = 64 - imm6
2368 static unsigned decodeNVSAmt(uint32_t insn, bool LeftShift) {
2369 ElemSize esize = ESizeNA;
2370 unsigned L = (insn >> 7) & 1;
2371 unsigned imm6 = (insn >> 16) & 0x3F;
2375 else if (imm6 >> 4 == 1)
2377 else if (imm6 >> 5 == 1)
2380 assert(0 && "Wrong encoding of Inst{7:21-16}!");
2385 return esize == ESize64 ? imm6 : (imm6 - esize);
2387 return esize == ESize64 ? (esize - imm6) : (2*esize - imm6);
2391 // Imm4 = Inst{11-8}
2392 static unsigned decodeN3VImm(uint32_t insn) {
2393 return (insn >> 8) & 0xF;
2397 // D[d] D[d2] ... Rn [TIED_TO Rn] align [Rm]
2399 // D[d] D[d2] ... Rn [TIED_TO Rn] align [Rm] TIED_TO ... imm(idx)
2401 // Rn [TIED_TO Rn] align [Rm] D[d] D[d2] ...
2403 // Rn [TIED_TO Rn] align [Rm] D[d] D[d2] ... [imm(idx)]
2405 // Correctly set VLD*/VST*'s TIED_TO GPR, as the asm printer needs it.
2406 static bool DisassembleNLdSt0(MCInst &MI, unsigned Opcode, uint32_t insn,
2407 unsigned short NumOps, unsigned &NumOpsAdded, bool Store, bool DblSpaced,
2408 unsigned alignment, BO B) {
2410 const MCInstrDesc &MCID = ARMInsts[Opcode];
2411 const MCOperandInfo *OpInfo = MCID.OpInfo;
2413 // At least one DPR register plus addressing mode #6.
2414 assert(NumOps >= 3 && "Expect >= 3 operands");
2416 unsigned &OpIdx = NumOpsAdded;
2420 // We have homogeneous NEON registers for Load/Store.
2421 unsigned RegClass = 0;
2423 // Double-spaced registers have increments of 2.
2424 unsigned Inc = DblSpaced ? 2 : 1;
2426 unsigned Rn = decodeRn(insn);
2427 unsigned Rm = decodeRm(insn);
2428 unsigned Rd = decodeNEONRd(insn);
2430 // A7.7.1 Advanced SIMD addressing mode.
2433 // LLVM Addressing Mode #6.
2434 unsigned RmEnum = 0;
2436 RmEnum = getRegisterEnum(B, ARM::GPRRegClassID, Rm);
2439 // Consume possible WB, AddrMode6, possible increment reg, the DPR/QPR's,
2440 // then possible lane index.
2441 assert(OpIdx < NumOps && OpInfo[0].RegClass == ARM::GPRRegClassID &&
2442 "Reg operand expected");
2445 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2450 assert((OpIdx+1) < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
2451 OpInfo[OpIdx + 1].RegClass < 0 && "Addrmode #6 Operands expected");
2452 // addrmode6 := (ops GPR:$addr, i32imm)
2453 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2455 MI.addOperand(MCOperand::CreateImm(alignment)); // Alignment
2459 MI.addOperand(MCOperand::CreateReg(RmEnum));
2463 assert(OpIdx < NumOps &&
2464 (OpInfo[OpIdx].RegClass == ARM::DPRRegClassID ||
2465 OpInfo[OpIdx].RegClass == ARM::QPRRegClassID) &&
2466 "Reg operand expected");
2468 RegClass = OpInfo[OpIdx].RegClass;
2469 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2470 MI.addOperand(MCOperand::CreateReg(
2471 getRegisterEnum(B, RegClass, Rd)));
2476 // Handle possible lane index.
2477 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2478 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2479 MI.addOperand(MCOperand::CreateImm(decodeLaneIndex(insn)));
2484 // Consume the DPR/QPR's, possible WB, AddrMode6, possible incrment reg,
2485 // possible TIED_TO DPR/QPR's (ignored), then possible lane index.
2486 RegClass = OpInfo[0].RegClass;
2488 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2489 MI.addOperand(MCOperand::CreateReg(
2490 getRegisterEnum(B, RegClass, Rd)));
2496 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2501 assert((OpIdx+1) < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
2502 OpInfo[OpIdx + 1].RegClass < 0 && "Addrmode #6 Operands expected");
2503 // addrmode6 := (ops GPR:$addr, i32imm)
2504 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2506 MI.addOperand(MCOperand::CreateImm(alignment)); // Alignment
2510 MI.addOperand(MCOperand::CreateReg(RmEnum));
2514 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2515 assert(MCID.getOperandConstraint(OpIdx, MCOI::TIED_TO) != -1 &&
2516 "Tied to operand expected");
2517 MI.addOperand(MCOperand::CreateReg(0));
2521 // Handle possible lane index.
2522 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2523 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2524 MI.addOperand(MCOperand::CreateImm(decodeLaneIndex(insn)));
2529 // Accessing registers past the end of the NEON register file is not
2537 // A8.6.308, A8.6.311, A8.6.314, A8.6.317.
2538 static bool Align4OneLaneInst(unsigned elem, unsigned size,
2539 unsigned index_align, unsigned & alignment) {
2547 return slice(index_align, 0, 0) == 0;
2548 else if (size == 1) {
2549 bits = slice(index_align, 1, 0);
2550 if (bits != 0 && bits != 1)
2555 } else if (size == 2) {
2556 bits = slice(index_align, 2, 0);
2557 if (bits != 0 && bits != 3)
2567 if (slice(index_align, 0, 0) == 1)
2571 if (slice(index_align, 0, 0) == 1)
2574 } else if (size == 2) {
2575 if (slice(index_align, 1, 1) != 0)
2577 if (slice(index_align, 0, 0) == 1)
2585 if (slice(index_align, 0, 0) != 0)
2589 if (slice(index_align, 0, 0) != 0)
2593 } else if (size == 2) {
2594 if (slice(index_align, 1, 0) != 0)
2602 if (slice(index_align, 0, 0) == 1)
2606 if (slice(index_align, 0, 0) == 1)
2609 } else if (size == 2) {
2610 bits = slice(index_align, 1, 0);
2624 // If L (Inst{21}) == 0, store instructions.
2625 // Find out about double-spaced-ness of the Opcode and pass it on to
2626 // DisassembleNLdSt0().
2627 static bool DisassembleNLdSt(MCInst &MI, unsigned Opcode, uint32_t insn,
2628 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2630 const StringRef Name = ARMInsts[Opcode].Name;
2631 bool DblSpaced = false;
2632 // 0 represents standard alignment, i.e., unaligned data access.
2633 unsigned alignment = 0;
2635 unsigned elem = 0; // legal values: {1, 2, 3, 4}
2636 if (Name.startswith("VST1") || Name.startswith("VLD1"))
2639 if (Name.startswith("VST2") || Name.startswith("VLD2"))
2642 if (Name.startswith("VST3") || Name.startswith("VLD3"))
2645 if (Name.startswith("VST4") || Name.startswith("VLD4"))
2648 if (Name.find("LN") != std::string::npos) {
2649 // To one lane instructions.
2650 // See, for example, 8.6.317 VLD4 (single 4-element structure to one lane).
2652 // Utility function takes number of elements, size, and index_align.
2653 if (!Align4OneLaneInst(elem,
2654 slice(insn, 11, 10),
2659 // <size> == 16 && Inst{5} == 1 --> DblSpaced = true
2660 if (Name.endswith("16") || Name.endswith("16_UPD"))
2661 DblSpaced = slice(insn, 5, 5) == 1;
2663 // <size> == 32 && Inst{6} == 1 --> DblSpaced = true
2664 if (Name.endswith("32") || Name.endswith("32_UPD"))
2665 DblSpaced = slice(insn, 6, 6) == 1;
2666 } else if (Name.find("DUP") != std::string::npos) {
2667 // Single element (or structure) to all lanes.
2668 // Inst{9-8} encodes the number of element(s) in the structure, with:
2669 // 0b00 (VLD1DUP) (for this, a bit makes sense only for data size 16 and 32.
2671 // 0b10 (VLD3DUP) (for this, a bit must be encoded as 0)
2674 // Inst{7-6} encodes the data size, with:
2675 // 0b00 => 8, 0b01 => 16, 0b10 => 32
2677 // Inst{4} (the a bit) encodes the align action (0: standard alignment)
2678 unsigned elem = slice(insn, 9, 8) + 1;
2679 unsigned a = slice(insn, 4, 4);
2681 // 0b11 is not a valid encoding for Inst{7-6}.
2682 if (slice(insn, 7, 6) == 3)
2684 unsigned data_size = 8 << slice(insn, 7, 6);
2685 // For VLD1DUP, a bit makes sense only for data size of 16 and 32.
2686 if (a && data_size == 8)
2689 // Now we can calculate the alignment!
2691 alignment = elem * data_size;
2694 // A8.6.315 VLD3 (single 3-element structure to all lanes)
2695 // The a bit must be encoded as 0.
2700 // Multiple n-element structures with type encoded as Inst{11-8}.
2701 // See, for example, A8.6.316 VLD4 (multiple 4-element structures).
2703 // Inst{5-4} encodes alignment.
2704 unsigned align = slice(insn, 5, 4);
2709 alignment = 64; break;
2711 alignment = 128; break;
2713 alignment = 256; break;
2716 unsigned type = slice(insn, 11, 8);
2717 // Reject UNDEFINED instructions based on type and align.
2718 // Plus set DblSpaced flag where appropriate.
2724 // A8.6.307 & A8.6.391
2725 if ((type == 7 && slice(align, 1, 1) == 1) ||
2726 (type == 10 && align == 3) ||
2727 (type == 6 && slice(align, 1, 1) == 1))
2731 // n == 2 && type == 0b1001 -> DblSpaced = true
2732 // A8.6.310 & A8.6.393
2733 if ((type == 8 || type == 9) && align == 3)
2735 DblSpaced = (type == 9);
2738 // n == 3 && type == 0b0101 -> DblSpaced = true
2739 // A8.6.313 & A8.6.395
2740 if (slice(insn, 7, 6) == 3 || slice(align, 1, 1) == 1)
2742 DblSpaced = (type == 5);
2745 // n == 4 && type == 0b0001 -> DblSpaced = true
2746 // A8.6.316 & A8.6.397
2747 if (slice(insn, 7, 6) == 3)
2749 DblSpaced = (type == 1);
2753 return DisassembleNLdSt0(MI, Opcode, insn, NumOps, NumOpsAdded,
2754 slice(insn, 21, 21) == 0, DblSpaced, alignment/8, B);
2761 // Qd/Dd imm src(=Qd/Dd)
2762 static bool DisassembleN1RegModImmFrm(MCInst &MI, unsigned Opcode,
2763 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2765 const MCInstrDesc &MCID = ARMInsts[Opcode];
2766 const MCOperandInfo *OpInfo = MCID.OpInfo;
2768 assert(NumOps >= 2 &&
2769 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2770 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2771 (OpInfo[1].RegClass < 0) &&
2772 "Expect 1 reg operand followed by 1 imm operand");
2774 // Qd/Dd = Inst{22:15-12} => NEON Rd
2775 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[0].RegClass,
2776 decodeNEONRd(insn))));
2778 ElemSize esize = ESizeNA;
2781 case ARM::VMOVv16i8:
2784 case ARM::VMOVv4i16:
2785 case ARM::VMOVv8i16:
2786 case ARM::VMVNv4i16:
2787 case ARM::VMVNv8i16:
2788 case ARM::VBICiv4i16:
2789 case ARM::VBICiv8i16:
2790 case ARM::VORRiv4i16:
2791 case ARM::VORRiv8i16:
2794 case ARM::VMOVv2i32:
2795 case ARM::VMOVv4i32:
2796 case ARM::VMVNv2i32:
2797 case ARM::VMVNv4i32:
2798 case ARM::VBICiv2i32:
2799 case ARM::VBICiv4i32:
2800 case ARM::VORRiv2i32:
2801 case ARM::VORRiv4i32:
2804 case ARM::VMOVv1i64:
2805 case ARM::VMOVv2i64:
2809 assert(0 && "Unexpected opcode!");
2813 // One register and a modified immediate value.
2814 // Add the imm operand.
2815 MI.addOperand(MCOperand::CreateImm(decodeN1VImm(insn, esize)));
2819 // VBIC/VORRiv*i* variants have an extra $src = $Vd to be filled in.
2821 (OpInfo[2].RegClass == ARM::DPRRegClassID ||
2822 OpInfo[2].RegClass == ARM::QPRRegClassID)) {
2823 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[0].RegClass,
2824 decodeNEONRd(insn))));
2835 N2V_VectorConvert_Between_Float_Fixed
2837 } // End of unnamed namespace
2839 // Vector Convert [between floating-point and fixed-point]
2840 // Qd/Dd Qm/Dm [fbits]
2842 // Vector Duplicate Lane (from scalar to all elements) Instructions.
2843 // VDUPLN16d, VDUPLN16q, VDUPLN32d, VDUPLN32q, VDUPLN8d, VDUPLN8q:
2846 // Vector Move Long:
2849 // Vector Move Narrow:
2853 static bool DisassembleNVdVmOptImm(MCInst &MI, unsigned Opc, uint32_t insn,
2854 unsigned short NumOps, unsigned &NumOpsAdded, N2VFlag Flag, BO B) {
2856 const MCInstrDesc &MCID = ARMInsts[Opc];
2857 const MCOperandInfo *OpInfo = MCID.OpInfo;
2859 assert(NumOps >= 2 &&
2860 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2861 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2862 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2863 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2864 "Expect >= 2 operands and first 2 as reg operands");
2866 unsigned &OpIdx = NumOpsAdded;
2870 ElemSize esize = ESizeNA;
2871 if (Flag == N2V_VectorDupLane) {
2872 // VDUPLN has its index embedded. Its size can be inferred from the Opcode.
2873 assert(Opc >= ARM::VDUPLN16d && Opc <= ARM::VDUPLN8q &&
2874 "Unexpected Opcode");
2875 esize = (Opc == ARM::VDUPLN8d || Opc == ARM::VDUPLN8q) ? ESize8
2876 : ((Opc == ARM::VDUPLN16d || Opc == ARM::VDUPLN16q) ? ESize16
2880 // Qd/Dd = Inst{22:15-12} => NEON Rd
2881 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2882 decodeNEONRd(insn))));
2886 if (MCID.getOperandConstraint(OpIdx, MCOI::TIED_TO) != -1) {
2888 MI.addOperand(MCOperand::CreateReg(0));
2892 // Dm = Inst{5:3-0} => NEON Rm
2893 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2894 decodeNEONRm(insn))));
2897 // VZIP and others have two TIED_TO reg operands.
2899 while (OpIdx < NumOps &&
2900 (Idx = MCID.getOperandConstraint(OpIdx, MCOI::TIED_TO)) != -1) {
2901 // Add TIED_TO operand.
2902 MI.addOperand(MI.getOperand(Idx));
2906 // Add the imm operand, if required.
2907 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2908 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2910 unsigned imm = 0xFFFFFFFF;
2912 if (Flag == N2V_VectorDupLane)
2913 imm = decodeNVLaneDupIndex(insn, esize);
2914 if (Flag == N2V_VectorConvert_Between_Float_Fixed)
2915 imm = decodeVCVTFractionBits(insn);
2917 assert(imm != 0xFFFFFFFF && "Internal error");
2918 MI.addOperand(MCOperand::CreateImm(imm));
2925 static bool DisassembleN2RegFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2926 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2928 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2931 static bool DisassembleNVCVTFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2932 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2934 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2935 N2V_VectorConvert_Between_Float_Fixed, B);
2937 static bool DisassembleNVecDupLnFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2938 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2940 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2941 N2V_VectorDupLane, B);
2944 // Vector Shift [Accumulate] Instructions.
2945 // Qd/Dd [Qd/Dd (TIED_TO)] Qm/Dm ShiftAmt
2947 // Vector Shift Left Long (with maximum shift count) Instructions.
2948 // VSHLLi16, VSHLLi32, VSHLLi8: Qd Dm imm (== size)
2950 static bool DisassembleNVectorShift(MCInst &MI, unsigned Opcode, uint32_t insn,
2951 unsigned short NumOps, unsigned &NumOpsAdded, bool LeftShift, BO B) {
2953 const MCInstrDesc &MCID = ARMInsts[Opcode];
2954 const MCOperandInfo *OpInfo = MCID.OpInfo;
2956 assert(NumOps >= 3 &&
2957 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2958 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2959 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2960 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2961 "Expect >= 3 operands and first 2 as reg operands");
2963 unsigned &OpIdx = NumOpsAdded;
2967 // Qd/Dd = Inst{22:15-12} => NEON Rd
2968 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2969 decodeNEONRd(insn))));
2972 if (MCID.getOperandConstraint(OpIdx, MCOI::TIED_TO) != -1) {
2974 MI.addOperand(MCOperand::CreateReg(0));
2978 assert((OpInfo[OpIdx].RegClass == ARM::DPRRegClassID ||
2979 OpInfo[OpIdx].RegClass == ARM::QPRRegClassID) &&
2980 "Reg operand expected");
2982 // Qm/Dm = Inst{5:3-0} => NEON Rm
2983 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2984 decodeNEONRm(insn))));
2987 assert(OpInfo[OpIdx].RegClass < 0 && "Imm operand expected");
2989 // Add the imm operand.
2991 // VSHLL has maximum shift count as the imm, inferred from its size.
2995 Imm = decodeNVSAmt(insn, LeftShift);
3007 MI.addOperand(MCOperand::CreateImm(Imm));
3013 // Left shift instructions.
3014 static bool DisassembleN2RegVecShLFrm(MCInst &MI, unsigned Opcode,
3015 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3017 return DisassembleNVectorShift(MI, Opcode, insn, NumOps, NumOpsAdded, true,
3020 // Right shift instructions have different shift amount interpretation.
3021 static bool DisassembleN2RegVecShRFrm(MCInst &MI, unsigned Opcode,
3022 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3024 return DisassembleNVectorShift(MI, Opcode, insn, NumOps, NumOpsAdded, false,
3033 N3V_Multiply_By_Scalar
3035 } // End of unnamed namespace
3037 // NEON Three Register Instructions with Optional Immediate Operand
3039 // Vector Extract Instructions.
3040 // Qd/Dd Qn/Dn Qm/Dm imm4
3042 // Vector Shift (Register) Instructions.
3043 // Qd/Dd Qm/Dm Qn/Dn (notice the order of m, n)
3045 // Vector Multiply [Accumulate/Subtract] [Long] By Scalar Instructions.
3046 // Qd/Dd Qn/Dn RestrictedDm index
3049 static bool DisassembleNVdVnVmOptImm(MCInst &MI, unsigned Opcode, uint32_t insn,
3050 unsigned short NumOps, unsigned &NumOpsAdded, N3VFlag Flag, BO B) {
3052 const MCInstrDesc &MCID = ARMInsts[Opcode];
3053 const MCOperandInfo *OpInfo = MCID.OpInfo;
3055 // No checking for OpInfo[2] because of MOVDneon/MOVQ with only two regs.
3056 assert(NumOps >= 3 &&
3057 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
3058 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
3059 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
3060 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
3061 "Expect >= 3 operands and first 2 as reg operands");
3063 unsigned &OpIdx = NumOpsAdded;
3067 bool VdVnVm = Flag == N3V_VectorShift ? false : true;
3068 bool IsImm4 = Flag == N3V_VectorExtract ? true : false;
3069 bool IsDmRestricted = Flag == N3V_Multiply_By_Scalar ? true : false;
3070 ElemSize esize = ESizeNA;
3071 if (Flag == N3V_Multiply_By_Scalar) {
3072 unsigned size = (insn >> 20) & 3;
3073 if (size == 1) esize = ESize16;
3074 if (size == 2) esize = ESize32;
3075 assert (esize == ESize16 || esize == ESize32);
3078 // Qd/Dd = Inst{22:15-12} => NEON Rd
3079 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
3080 decodeNEONRd(insn))));
3083 // VABA, VABAL, VBSLd, VBSLq, ...
3084 if (MCID.getOperandConstraint(OpIdx, MCOI::TIED_TO) != -1) {
3086 MI.addOperand(MCOperand::CreateReg(0));
3090 // Dn = Inst{7:19-16} => NEON Rn
3092 // Dm = Inst{5:3-0} => NEON Rm
3093 MI.addOperand(MCOperand::CreateReg(
3094 getRegisterEnum(B, OpInfo[OpIdx].RegClass,
3095 VdVnVm ? decodeNEONRn(insn)
3096 : decodeNEONRm(insn))));
3099 // Dm = Inst{5:3-0} => NEON Rm
3101 // Dm is restricted to D0-D7 if size is 16, D0-D15 otherwise
3103 // Dn = Inst{7:19-16} => NEON Rn
3104 unsigned m = VdVnVm ? (IsDmRestricted ? decodeRestrictedDm(insn, esize)
3105 : decodeNEONRm(insn))
3106 : decodeNEONRn(insn);
3108 MI.addOperand(MCOperand::CreateReg(
3109 getRegisterEnum(B, OpInfo[OpIdx].RegClass, m)));
3112 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
3113 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
3114 // Add the imm operand.
3117 Imm = decodeN3VImm(insn);
3118 else if (IsDmRestricted)
3119 Imm = decodeRestrictedDmIndex(insn, esize);
3121 assert(0 && "Internal error: unreachable code!");
3125 MI.addOperand(MCOperand::CreateImm(Imm));
3132 static bool DisassembleN3RegFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3133 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3135 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
3138 static bool DisassembleN3RegVecShFrm(MCInst &MI, unsigned Opcode,
3139 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3141 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
3142 N3V_VectorShift, B);
3144 static bool DisassembleNVecExtractFrm(MCInst &MI, unsigned Opcode,
3145 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3147 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
3148 N3V_VectorExtract, B);
3150 static bool DisassembleNVecMulScalarFrm(MCInst &MI, unsigned Opcode,
3151 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3153 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
3154 N3V_Multiply_By_Scalar, B);
3157 // Vector Table Lookup
3159 // VTBL1, VTBX1: Dd [Dd(TIED_TO)] Dn Dm
3160 // VTBL2, VTBX2: Dd [Dd(TIED_TO)] Dn Dn+1 Dm
3161 // VTBL3, VTBX3: Dd [Dd(TIED_TO)] Dn Dn+1 Dn+2 Dm
3162 // VTBL4, VTBX4: Dd [Dd(TIED_TO)] Dn Dn+1 Dn+2 Dn+3 Dm
3163 static bool DisassembleNVTBLFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3164 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3166 const MCInstrDesc &MCID = ARMInsts[Opcode];
3167 const MCOperandInfo *OpInfo = MCID.OpInfo;
3168 if (!OpInfo) return false;
3170 assert(NumOps >= 3 &&
3171 OpInfo[0].RegClass == ARM::DPRRegClassID &&
3172 OpInfo[1].RegClass == ARM::DPRRegClassID &&
3173 OpInfo[2].RegClass == ARM::DPRRegClassID &&
3174 "Expect >= 3 operands and first 3 as reg operands");
3176 unsigned &OpIdx = NumOpsAdded;
3180 unsigned Rn = decodeNEONRn(insn);
3182 // {Dn} encoded as len = 0b00
3183 // {Dn Dn+1} encoded as len = 0b01
3184 // {Dn Dn+1 Dn+2 } encoded as len = 0b10
3185 // {Dn Dn+1 Dn+2 Dn+3} encoded as len = 0b11
3186 unsigned Len = slice(insn, 9, 8) + 1;
3188 // Dd (the destination vector)
3189 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
3190 decodeNEONRd(insn))));
3193 // Process tied_to operand constraint.
3195 if ((Idx = MCID.getOperandConstraint(OpIdx, MCOI::TIED_TO)) != -1) {
3196 MI.addOperand(MI.getOperand(Idx));
3200 // Do the <list> now.
3201 for (unsigned i = 0; i < Len; ++i) {
3202 assert(OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::DPRRegClassID &&
3203 "Reg operand expected");
3204 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
3209 // Dm (the index vector)
3210 assert(OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::DPRRegClassID &&
3211 "Reg operand (index vector) expected");
3212 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
3213 decodeNEONRm(insn))));
3219 // Vector Get Lane (move scalar to ARM core register) Instructions.
3220 // VGETLNi32, VGETLNs16, VGETLNs8, VGETLNu16, VGETLNu8: Rt Dn index
3221 static bool DisassembleNGetLnFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3222 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3224 const MCInstrDesc &MCID = ARMInsts[Opcode];
3225 const MCOperandInfo *OpInfo = MCID.OpInfo;
3226 if (!OpInfo) return false;
3228 assert(MCID.getNumDefs() == 1 && NumOps >= 3 &&
3229 OpInfo[0].RegClass == ARM::GPRRegClassID &&
3230 OpInfo[1].RegClass == ARM::DPRRegClassID &&
3231 OpInfo[2].RegClass < 0 &&
3232 "Expect >= 3 operands with one dst operand");
3235 Opcode == ARM::VGETLNi32 ? ESize32
3236 : ((Opcode == ARM::VGETLNs16 || Opcode == ARM::VGETLNu16) ? ESize16
3239 // Rt = Inst{15-12} => ARM Rd
3240 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3243 // Dn = Inst{7:19-16} => NEON Rn
3244 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
3245 decodeNEONRn(insn))));
3247 MI.addOperand(MCOperand::CreateImm(decodeNVLaneOpIndex(insn, esize)));
3253 // Vector Set Lane (move ARM core register to scalar) Instructions.
3254 // VSETLNi16, VSETLNi32, VSETLNi8: Dd Dd (TIED_TO) Rt index
3255 static bool DisassembleNSetLnFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3256 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3258 const MCInstrDesc &MCID = ARMInsts[Opcode];
3259 const MCOperandInfo *OpInfo = MCID.OpInfo;
3260 if (!OpInfo) return false;
3262 assert(MCID.getNumDefs() == 1 && NumOps >= 3 &&
3263 OpInfo[0].RegClass == ARM::DPRRegClassID &&
3264 OpInfo[1].RegClass == ARM::DPRRegClassID &&
3265 MCID.getOperandConstraint(1, MCOI::TIED_TO) != -1 &&
3266 OpInfo[2].RegClass == ARM::GPRRegClassID &&
3267 OpInfo[3].RegClass < 0 &&
3268 "Expect >= 3 operands with one dst operand");
3271 Opcode == ARM::VSETLNi8 ? ESize8
3272 : (Opcode == ARM::VSETLNi16 ? ESize16
3275 // Dd = Inst{7:19-16} => NEON Rn
3276 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
3277 decodeNEONRn(insn))));
3280 MI.addOperand(MCOperand::CreateReg(0));
3282 // Rt = Inst{15-12} => ARM Rd
3283 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3286 MI.addOperand(MCOperand::CreateImm(decodeNVLaneOpIndex(insn, esize)));
3292 // Vector Duplicate Instructions (from ARM core register to all elements).
3293 // VDUP8d, VDUP16d, VDUP32d, VDUP8q, VDUP16q, VDUP32q: Qd/Dd Rt
3294 static bool DisassembleNDupFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3295 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3297 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3299 assert(NumOps >= 2 &&
3300 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
3301 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
3302 OpInfo[1].RegClass == ARM::GPRRegClassID &&
3303 "Expect >= 2 operands and first 2 as reg operand");
3305 unsigned RegClass = OpInfo[0].RegClass;
3307 // Qd/Dd = Inst{7:19-16} => NEON Rn
3308 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClass,
3309 decodeNEONRn(insn))));
3311 // Rt = Inst{15-12} => ARM Rd
3312 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3319 static inline bool PreLoadOpcode(unsigned Opcode) {
3321 case ARM::PLDi12: case ARM::PLDrs:
3322 case ARM::PLDWi12: case ARM::PLDWrs:
3323 case ARM::PLIi12: case ARM::PLIrs:
3330 static bool DisassemblePreLoadFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3331 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3333 // Preload Data/Instruction requires either 2 or 3 operands.
3334 // PLDi12, PLDWi12, PLIi12: addrmode_imm12
3335 // PLDrs, PLDWrs, PLIrs: ldst_so_reg
3337 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3340 if (Opcode == ARM::PLDi12 || Opcode == ARM::PLDWi12
3341 || Opcode == ARM::PLIi12) {
3342 unsigned Imm12 = slice(insn, 11, 0);
3343 bool Negative = getUBit(insn) == 0;
3345 // A8.6.118 PLD (literal) PLDWi12 with Rn=PC is transformed to PLDi12.
3346 if (Opcode == ARM::PLDWi12 && slice(insn, 19, 16) == 0xF) {
3347 DEBUG(errs() << "Rn == '1111': PLDWi12 morphed to PLDi12\n");
3348 MI.setOpcode(ARM::PLDi12);
3351 // -0 is represented specially. All other values are as normal.
3352 int Offset = Negative ? -1 * Imm12 : Imm12;
3353 if (Imm12 == 0 && Negative)
3356 MI.addOperand(MCOperand::CreateImm(Offset));
3359 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3362 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
3364 // Inst{6-5} encodes the shift opcode.
3365 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
3366 // Inst{11-7} encodes the imm5 shift amount.
3367 unsigned ShImm = slice(insn, 11, 7);
3369 // A8.4.1. Possible rrx or shift amount of 32...
3370 getImmShiftSE(ShOp, ShImm);
3371 MI.addOperand(MCOperand::CreateImm(
3372 ARM_AM::getAM2Opc(AddrOpcode, ShImm, ShOp)));
3379 static bool DisassembleMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3380 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3382 if (Opcode == ARM::DMB || Opcode == ARM::DSB || Opcode == ARM::ISB) {
3383 // Inst{3-0} encodes the memory barrier option for the variants.
3384 unsigned opt = slice(insn, 3, 0);
3386 case ARM_MB::SY: case ARM_MB::ST:
3387 case ARM_MB::ISH: case ARM_MB::ISHST:
3388 case ARM_MB::NSH: case ARM_MB::NSHST:
3389 case ARM_MB::OSH: case ARM_MB::OSHST:
3390 MI.addOperand(MCOperand::CreateImm(opt));
3409 // SWP, SWPB: Rd Rm Rn
3410 // Delegate to DisassembleLdStExFrm()....
3411 return DisassembleLdStExFrm(MI, Opcode, insn, NumOps, NumOpsAdded, B);
3416 if (Opcode == ARM::SETEND) {
3418 MI.addOperand(MCOperand::CreateImm(slice(insn, 9, 9)));
3422 // FIXME: To enable correct asm parsing and disasm of CPS we need 3 different
3423 // opcodes which match the same real instruction. This is needed since there's
3424 // no current handling of optional arguments. Fix here when a better handling
3425 // of optional arguments is implemented.
3426 if (Opcode == ARM::CPS3p) { // M = 1
3427 // Let's reject these impossible imod values by returning false:
3430 // AsmPrinter cannot handle imod=0b00, plus (imod=0b00,M=1,iflags!=0) is an
3431 // invalid combination, so we just check for imod=0b00 here.
3432 if (slice(insn, 19, 18) == 0 || slice(insn, 19, 18) == 1)
3434 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 18))); // imod
3435 MI.addOperand(MCOperand::CreateImm(slice(insn, 8, 6))); // iflags
3436 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0))); // mode
3440 if (Opcode == ARM::CPS2p) { // mode = 0, M = 0
3441 // Let's reject these impossible imod values by returning false:
3442 // 1. (imod=0b00,M=0)
3444 if (slice(insn, 19, 18) == 0 || slice(insn, 19, 18) == 1)
3446 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 18))); // imod
3447 MI.addOperand(MCOperand::CreateImm(slice(insn, 8, 6))); // iflags
3451 if (Opcode == ARM::CPS1p) { // imod = 0, iflags = 0, M = 1
3452 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0))); // mode
3457 // DBG has its option specified in Inst{3-0}.
3458 if (Opcode == ARM::DBG) {
3459 MI.addOperand(MCOperand::CreateImm(slice(insn, 3, 0)));
3464 // BKPT takes an imm32 val equal to ZeroExtend(Inst{19-8:3-0}).
3465 if (Opcode == ARM::BKPT) {
3466 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 8) << 4 |
3467 slice(insn, 3, 0)));
3472 if (PreLoadOpcode(Opcode))
3473 return DisassemblePreLoadFrm(MI, Opcode, insn, NumOps, NumOpsAdded, B);
3475 assert(0 && "Unexpected misc instruction!");
3479 /// FuncPtrs - FuncPtrs maps ARMFormat to its corresponding DisassembleFP.
3480 /// We divide the disassembly task into different categories, with each one
3481 /// corresponding to a specific instruction encoding format. There could be
3482 /// exceptions when handling a specific format, and that is why the Opcode is
3483 /// also present in the function prototype.
3484 static const DisassembleFP FuncPtrs[] = {
3488 &DisassembleBrMiscFrm,
3490 &DisassembleDPSoRegFrm,
3493 &DisassembleLdMiscFrm,
3494 &DisassembleStMiscFrm,
3495 &DisassembleLdStMulFrm,
3496 &DisassembleLdStExFrm,
3497 &DisassembleArithMiscFrm,
3500 &DisassembleVFPUnaryFrm,
3501 &DisassembleVFPBinaryFrm,
3502 &DisassembleVFPConv1Frm,
3503 &DisassembleVFPConv2Frm,
3504 &DisassembleVFPConv3Frm,
3505 &DisassembleVFPConv4Frm,
3506 &DisassembleVFPConv5Frm,
3507 &DisassembleVFPLdStFrm,
3508 &DisassembleVFPLdStMulFrm,
3509 &DisassembleVFPMiscFrm,
3510 &DisassembleThumbFrm,
3511 &DisassembleMiscFrm,
3512 &DisassembleNGetLnFrm,
3513 &DisassembleNSetLnFrm,
3514 &DisassembleNDupFrm,
3516 // VLD and VST (including one lane) Instructions.
3519 // A7.4.6 One register and a modified immediate value
3520 // 1-Register Instructions with imm.
3521 // LLVM only defines VMOVv instructions.
3522 &DisassembleN1RegModImmFrm,
3524 // 2-Register Instructions with no imm.
3525 &DisassembleN2RegFrm,
3527 // 2-Register Instructions with imm (vector convert float/fixed point).
3528 &DisassembleNVCVTFrm,
3530 // 2-Register Instructions with imm (vector dup lane).
3531 &DisassembleNVecDupLnFrm,
3533 // Vector Shift Left Instructions.
3534 &DisassembleN2RegVecShLFrm,
3536 // Vector Shift Righ Instructions, which has different interpretation of the
3537 // shift amount from the imm6 field.
3538 &DisassembleN2RegVecShRFrm,
3540 // 3-Register Data-Processing Instructions.
3541 &DisassembleN3RegFrm,
3543 // Vector Shift (Register) Instructions.
3544 // D:Vd M:Vm N:Vn (notice that M:Vm is the first operand)
3545 &DisassembleN3RegVecShFrm,
3547 // Vector Extract Instructions.
3548 &DisassembleNVecExtractFrm,
3550 // Vector [Saturating Rounding Doubling] Multiply [Accumulate/Subtract] [Long]
3551 // By Scalar Instructions.
3552 &DisassembleNVecMulScalarFrm,
3554 // Vector Table Lookup uses byte indexes in a control vector to look up byte
3555 // values in a table and generate a new vector.
3556 &DisassembleNVTBLFrm,
3561 /// BuildIt - BuildIt performs the build step for this ARM Basic MC Builder.
3562 /// The general idea is to set the Opcode for the MCInst, followed by adding
3563 /// the appropriate MCOperands to the MCInst. ARM Basic MC Builder delegates
3564 /// to the Format-specific disassemble function for disassembly, followed by
3565 /// TryPredicateAndSBitModifier() to do PredicateOperand and OptionalDefOperand
3566 /// which follow the Dst/Src Operands.
3567 bool ARMBasicMCBuilder::BuildIt(MCInst &MI, uint32_t insn) {
3568 // Stage 1 sets the Opcode.
3569 MI.setOpcode(Opcode);
3570 // If the number of operands is zero, we're done!
3574 // Stage 2 calls the format-specific disassemble function to build the operand
3578 unsigned NumOpsAdded = 0;
3579 bool OK = (*Disasm)(MI, Opcode, insn, NumOps, NumOpsAdded, this);
3581 if (!OK || this->Err != 0) return false;
3582 if (NumOpsAdded >= NumOps)
3585 // Stage 3 deals with operands unaccounted for after stage 2 is finished.
3586 // FIXME: Should this be done selectively?
3587 return TryPredicateAndSBitModifier(MI, Opcode, insn, NumOps - NumOpsAdded);
3590 // A8.3 Conditional execution
3591 // A8.3.1 Pseudocode details of conditional execution
3592 // Condition bits '111x' indicate the instruction is always executed.
3593 static uint32_t CondCode(uint32_t CondField) {
3594 if (CondField == 0xF)
3599 /// DoPredicateOperands - DoPredicateOperands process the predicate operands
3600 /// of some Thumb instructions which come before the reglist operands. It
3601 /// returns true if the two predicate operands have been processed.
3602 bool ARMBasicMCBuilder::DoPredicateOperands(MCInst& MI, unsigned Opcode,
3603 uint32_t /* insn */, unsigned short NumOpsRemaining) {
3605 assert(NumOpsRemaining > 0 && "Invalid argument");
3607 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3608 unsigned Idx = MI.getNumOperands();
3610 // First, we check whether this instr specifies the PredicateOperand through
3611 // a pair of MCOperandInfos with isPredicate() property.
3612 if (NumOpsRemaining >= 2 &&
3613 OpInfo[Idx].isPredicate() && OpInfo[Idx+1].isPredicate() &&
3614 OpInfo[Idx].RegClass < 0 &&
3615 OpInfo[Idx+1].RegClass == ARM::CCRRegClassID)
3617 // If we are inside an IT block, get the IT condition bits maintained via
3618 // ARMBasicMCBuilder::ITState[7:0], through ARMBasicMCBuilder::GetITCond().
3621 MI.addOperand(MCOperand::CreateImm(GetITCond()));
3623 MI.addOperand(MCOperand::CreateImm(ARMCC::AL));
3624 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
3631 /// TryPredicateAndSBitModifier - TryPredicateAndSBitModifier tries to process
3632 /// the possible Predicate and SBitModifier, to build the remaining MCOperand
3634 bool ARMBasicMCBuilder::TryPredicateAndSBitModifier(MCInst& MI, unsigned Opcode,
3635 uint32_t insn, unsigned short NumOpsRemaining) {
3637 assert(NumOpsRemaining > 0 && "Invalid argument");
3639 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3640 const std::string &Name = ARMInsts[Opcode].Name;
3641 unsigned Idx = MI.getNumOperands();
3642 uint64_t TSFlags = ARMInsts[Opcode].TSFlags;
3644 // First, we check whether this instr specifies the PredicateOperand through
3645 // a pair of MCOperandInfos with isPredicate() property.
3646 if (NumOpsRemaining >= 2 &&
3647 OpInfo[Idx].isPredicate() && OpInfo[Idx+1].isPredicate() &&
3648 OpInfo[Idx].RegClass < 0 &&
3649 OpInfo[Idx+1].RegClass == ARM::CCRRegClassID)
3651 // If we are inside an IT block, get the IT condition bits maintained via
3652 // ARMBasicMCBuilder::ITState[7:0], through ARMBasicMCBuilder::GetITCond().
3655 MI.addOperand(MCOperand::CreateImm(GetITCond()));
3657 if (Name.length() > 1 && Name[0] == 't') {
3658 // Thumb conditional branch instructions have their cond field embedded,
3662 // Check for undefined encodings.
3664 if (Name == "t2Bcc") {
3665 if ((cond = slice(insn, 25, 22)) >= 14)
3667 MI.addOperand(MCOperand::CreateImm(CondCode(cond)));
3668 } else if (Name == "tBcc") {
3669 if ((cond = slice(insn, 11, 8)) == 14)
3671 MI.addOperand(MCOperand::CreateImm(CondCode(cond)));
3673 MI.addOperand(MCOperand::CreateImm(ARMCC::AL));
3675 // ARM instructions get their condition field from Inst{31-28}.
3676 // We should reject Inst{31-28} = 0b1111 as invalid encoding.
3677 if (!isNEONDomain(TSFlags) && getCondField(insn) == 0xF)
3679 MI.addOperand(MCOperand::CreateImm(CondCode(getCondField(insn))));
3682 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
3684 NumOpsRemaining -= 2;
3687 if (NumOpsRemaining == 0)
3690 // Next, if OptionalDefOperand exists, we check whether the 'S' bit is set.
3691 if (OpInfo[Idx].isOptionalDef() && OpInfo[Idx].RegClass==ARM::CCRRegClassID) {
3692 MI.addOperand(MCOperand::CreateReg(getSBit(insn) == 1 ? ARM::CPSR : 0));
3696 if (NumOpsRemaining == 0)
3702 /// RunBuildAfterHook - RunBuildAfterHook performs operations deemed necessary
3703 /// after BuildIt is finished.
3704 bool ARMBasicMCBuilder::RunBuildAfterHook(bool Status, MCInst &MI,
3707 if (!SP) return Status;
3709 if (Opcode == ARM::t2IT)
3710 Status = SP->InitIT(slice(insn, 7, 0)) ? Status : false;
3711 else if (InITBlock())
3717 /// Opcode, Format, and NumOperands make up an ARM Basic MCBuilder.
3718 ARMBasicMCBuilder::ARMBasicMCBuilder(unsigned opc, ARMFormat format,
3720 : Opcode(opc), Format(format), NumOps(num), SP(0), Err(0) {
3721 unsigned Idx = (unsigned)format;
3722 assert(Idx < (array_lengthof(FuncPtrs) - 1) && "Unknown format");
3723 Disasm = FuncPtrs[Idx];
3726 /// CreateMCBuilder - Return an ARMBasicMCBuilder that can build up the MC
3727 /// infrastructure of an MCInst given the Opcode and Format of the instr.
3728 /// Return NULL if it fails to create/return a proper builder. API clients
3729 /// are responsible for freeing up of the allocated memory. Cacheing can be
3730 /// performed by the API clients to improve performance.
3731 ARMBasicMCBuilder *llvm::CreateMCBuilder(unsigned Opcode, ARMFormat Format) {
3732 // For "Unknown format", fail by returning a NULL pointer.
3733 if ((unsigned)Format >= (array_lengthof(FuncPtrs) - 1)) {
3734 DEBUG(errs() << "Unknown format\n");
3738 return new ARMBasicMCBuilder(Opcode, Format,
3739 ARMInsts[Opcode].getNumOperands());
3742 /// tryAddingSymbolicOperand - tryAddingSymbolicOperand trys to add a symbolic
3743 /// operand in place of the immediate Value in the MCInst. The immediate
3744 /// Value has had any PC adjustment made by the caller. If the getOpInfo()
3745 /// function was set as part of the setupBuilderForSymbolicDisassembly() call
3746 /// then that function is called to get any symbolic information at the
3747 /// builder's Address for this instrution. If that returns non-zero then the
3748 /// symbolic information it returns is used to create an MCExpr and that is
3749 /// added as an operand to the MCInst. This function returns true if it adds
3750 /// an operand to the MCInst and false otherwise.
3751 bool ARMBasicMCBuilder::tryAddingSymbolicOperand(uint64_t Value,
3757 struct LLVMOpInfo1 SymbolicOp;
3758 SymbolicOp.Value = Value;
3759 if (!GetOpInfo(DisInfo, Address, 0 /* Offset */, InstSize, 1, &SymbolicOp))
3762 const MCExpr *Add = NULL;
3763 if (SymbolicOp.AddSymbol.Present) {
3764 if (SymbolicOp.AddSymbol.Name) {
3765 StringRef Name(SymbolicOp.AddSymbol.Name);
3766 MCSymbol *Sym = Ctx->GetOrCreateSymbol(Name);
3767 Add = MCSymbolRefExpr::Create(Sym, *Ctx);
3769 Add = MCConstantExpr::Create(SymbolicOp.AddSymbol.Value, *Ctx);
3773 const MCExpr *Sub = NULL;
3774 if (SymbolicOp.SubtractSymbol.Present) {
3775 if (SymbolicOp.SubtractSymbol.Name) {
3776 StringRef Name(SymbolicOp.SubtractSymbol.Name);
3777 MCSymbol *Sym = Ctx->GetOrCreateSymbol(Name);
3778 Sub = MCSymbolRefExpr::Create(Sym, *Ctx);
3780 Sub = MCConstantExpr::Create(SymbolicOp.SubtractSymbol.Value, *Ctx);
3784 const MCExpr *Off = NULL;
3785 if (SymbolicOp.Value != 0)
3786 Off = MCConstantExpr::Create(SymbolicOp.Value, *Ctx);
3792 LHS = MCBinaryExpr::CreateSub(Add, Sub, *Ctx);
3794 LHS = MCUnaryExpr::CreateMinus(Sub, *Ctx);
3796 Expr = MCBinaryExpr::CreateAdd(LHS, Off, *Ctx);
3801 Expr = MCBinaryExpr::CreateAdd(Add, Off, *Ctx);
3808 Expr = MCConstantExpr::Create(0, *Ctx);
3811 if (SymbolicOp.VariantKind == LLVMDisassembler_VariantKind_ARM_HI16)
3812 MI.addOperand(MCOperand::CreateExpr(ARMMCExpr::CreateUpper16(Expr, *Ctx)));
3813 else if (SymbolicOp.VariantKind == LLVMDisassembler_VariantKind_ARM_LO16)
3814 MI.addOperand(MCOperand::CreateExpr(ARMMCExpr::CreateLower16(Expr, *Ctx)));
3815 else if (SymbolicOp.VariantKind == LLVMDisassembler_VariantKind_None)
3816 MI.addOperand(MCOperand::CreateExpr(Expr));
3818 assert("bad SymbolicOp.VariantKind");