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 "llvm/Support/Debug.h"
21 #include "llvm/Support/raw_ostream.h"
23 /// ARMGenInstrInfo.inc - ARMGenInstrInfo.inc contains the static const
24 /// TargetInstrDesc ARMInsts[] definition and the TargetOperandInfo[]'s
25 /// describing the operand info for each ARMInsts[i].
27 /// Together with an instruction's encoding format, we can take advantage of the
28 /// NumOperands and the OpInfo fields of the target instruction description in
29 /// the quest to build out the MCOperand list for an MCInst.
31 /// The general guideline is that with a known format, the number of dst and src
32 /// operands are well-known. The dst is built first, followed by the src
33 /// operand(s). The operands not yet used at this point are for the Implicit
34 /// Uses and Defs by this instr. For the Uses part, the pred:$p operand is
35 /// defined with two components:
37 /// def pred { // Operand PredicateOperand
38 /// ValueType Type = OtherVT;
39 /// string PrintMethod = "printPredicateOperand";
40 /// string AsmOperandLowerMethod = ?;
41 /// dag MIOperandInfo = (ops i32imm, CCR);
42 /// AsmOperandClass ParserMatchClass = ImmAsmOperand;
43 /// dag DefaultOps = (ops (i32 14), (i32 zero_reg));
46 /// which is manifested by the TargetOperandInfo[] of:
48 /// { 0, 0|(1<<TOI::Predicate), 0 },
49 /// { ARM::CCRRegClassID, 0|(1<<TOI::Predicate), 0 }
51 /// So the first predicate MCOperand corresponds to the immediate part of the
52 /// ARM condition field (Inst{31-28}), and the second predicate MCOperand
53 /// corresponds to a register kind of ARM::CPSR.
55 /// For the Defs part, in the simple case of only cc_out:$s, we have:
57 /// def cc_out { // Operand OptionalDefOperand
58 /// ValueType Type = OtherVT;
59 /// string PrintMethod = "printSBitModifierOperand";
60 /// string AsmOperandLowerMethod = ?;
61 /// dag MIOperandInfo = (ops CCR);
62 /// AsmOperandClass ParserMatchClass = ImmAsmOperand;
63 /// dag DefaultOps = (ops (i32 zero_reg));
66 /// which is manifested by the one TargetOperandInfo of:
68 /// { ARM::CCRRegClassID, 0|(1<<TOI::OptionalDef), 0 }
70 /// And this maps to one MCOperand with the regsiter kind of ARM::CPSR.
71 #include "ARMGenInstrInfo.inc"
75 const char *ARMUtils::OpcodeName(unsigned Opcode) {
76 return ARMInsts[Opcode].Name;
79 // Return the register enum Based on RegClass and the raw register number.
80 // For DRegPair, see comments below.
82 static unsigned getRegisterEnum(BO B, unsigned RegClassID, unsigned RawRegister,
83 bool DRegPair = false) {
85 if (DRegPair && RegClassID == ARM::QPRRegClassID) {
86 // LLVM expects { Dd, Dd+1 } to form a super register; this is not specified
87 // in the ARM Architecture Manual as far as I understand it (A8.6.307).
88 // Therefore, we morph the RegClassID to be the sub register class and don't
89 // subsequently transform the RawRegister encoding when calculating RegNum.
91 // See also ARMinstPrinter::printOperand() wrt "dregpair" modifier part
92 // where this workaround is meant for.
93 RegClassID = ARM::DPRRegClassID;
96 // See also decodeNEONRd(), decodeNEONRn(), decodeNEONRm().
98 RegClassID == ARM::QPRRegClassID ? RawRegister >> 1 : RawRegister;
104 switch (RegClassID) {
105 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R0;
106 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
107 case ARM::DPR_VFP2RegClassID:
109 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
110 case ARM::QPR_VFP2RegClassID:
112 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S0;
116 switch (RegClassID) {
117 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R1;
118 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
119 case ARM::DPR_VFP2RegClassID:
121 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
122 case ARM::QPR_VFP2RegClassID:
124 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S1;
128 switch (RegClassID) {
129 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R2;
130 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
131 case ARM::DPR_VFP2RegClassID:
133 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
134 case ARM::QPR_VFP2RegClassID:
136 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S2;
140 switch (RegClassID) {
141 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R3;
142 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
143 case ARM::DPR_VFP2RegClassID:
145 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
146 case ARM::QPR_VFP2RegClassID:
148 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S3;
152 switch (RegClassID) {
153 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R4;
154 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
155 case ARM::DPR_VFP2RegClassID:
157 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q4;
158 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S4;
162 switch (RegClassID) {
163 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R5;
164 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
165 case ARM::DPR_VFP2RegClassID:
167 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q5;
168 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S5;
172 switch (RegClassID) {
173 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R6;
174 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
175 case ARM::DPR_VFP2RegClassID:
177 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q6;
178 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S6;
182 switch (RegClassID) {
183 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R7;
184 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
185 case ARM::DPR_VFP2RegClassID:
187 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q7;
188 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S7;
192 switch (RegClassID) {
193 case ARM::GPRRegClassID: return ARM::R8;
194 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D8;
195 case ARM::QPRRegClassID: return ARM::Q8;
196 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S8;
200 switch (RegClassID) {
201 case ARM::GPRRegClassID: return ARM::R9;
202 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D9;
203 case ARM::QPRRegClassID: return ARM::Q9;
204 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S9;
208 switch (RegClassID) {
209 case ARM::GPRRegClassID: return ARM::R10;
210 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D10;
211 case ARM::QPRRegClassID: return ARM::Q10;
212 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S10;
216 switch (RegClassID) {
217 case ARM::GPRRegClassID: return ARM::R11;
218 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D11;
219 case ARM::QPRRegClassID: return ARM::Q11;
220 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S11;
224 switch (RegClassID) {
225 case ARM::GPRRegClassID: return ARM::R12;
226 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D12;
227 case ARM::QPRRegClassID: return ARM::Q12;
228 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S12;
232 switch (RegClassID) {
233 case ARM::GPRRegClassID: return ARM::SP;
234 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D13;
235 case ARM::QPRRegClassID: return ARM::Q13;
236 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S13;
240 switch (RegClassID) {
241 case ARM::GPRRegClassID: return ARM::LR;
242 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D14;
243 case ARM::QPRRegClassID: return ARM::Q14;
244 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S14;
248 switch (RegClassID) {
249 case ARM::GPRRegClassID: return ARM::PC;
250 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D15;
251 case ARM::QPRRegClassID: return ARM::Q15;
252 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S15;
256 switch (RegClassID) {
257 case ARM::DPRRegClassID: return ARM::D16;
258 case ARM::SPRRegClassID: return ARM::S16;
262 switch (RegClassID) {
263 case ARM::DPRRegClassID: return ARM::D17;
264 case ARM::SPRRegClassID: return ARM::S17;
268 switch (RegClassID) {
269 case ARM::DPRRegClassID: return ARM::D18;
270 case ARM::SPRRegClassID: return ARM::S18;
274 switch (RegClassID) {
275 case ARM::DPRRegClassID: return ARM::D19;
276 case ARM::SPRRegClassID: return ARM::S19;
280 switch (RegClassID) {
281 case ARM::DPRRegClassID: return ARM::D20;
282 case ARM::SPRRegClassID: return ARM::S20;
286 switch (RegClassID) {
287 case ARM::DPRRegClassID: return ARM::D21;
288 case ARM::SPRRegClassID: return ARM::S21;
292 switch (RegClassID) {
293 case ARM::DPRRegClassID: return ARM::D22;
294 case ARM::SPRRegClassID: return ARM::S22;
298 switch (RegClassID) {
299 case ARM::DPRRegClassID: return ARM::D23;
300 case ARM::SPRRegClassID: return ARM::S23;
304 switch (RegClassID) {
305 case ARM::DPRRegClassID: return ARM::D24;
306 case ARM::SPRRegClassID: return ARM::S24;
310 switch (RegClassID) {
311 case ARM::DPRRegClassID: return ARM::D25;
312 case ARM::SPRRegClassID: return ARM::S25;
316 switch (RegClassID) {
317 case ARM::DPRRegClassID: return ARM::D26;
318 case ARM::SPRRegClassID: return ARM::S26;
322 switch (RegClassID) {
323 case ARM::DPRRegClassID: return ARM::D27;
324 case ARM::SPRRegClassID: return ARM::S27;
328 switch (RegClassID) {
329 case ARM::DPRRegClassID: return ARM::D28;
330 case ARM::SPRRegClassID: return ARM::S28;
334 switch (RegClassID) {
335 case ARM::DPRRegClassID: return ARM::D29;
336 case ARM::SPRRegClassID: return ARM::S29;
340 switch (RegClassID) {
341 case ARM::DPRRegClassID: return ARM::D30;
342 case ARM::SPRRegClassID: return ARM::S30;
346 switch (RegClassID) {
347 case ARM::DPRRegClassID: return ARM::D31;
348 case ARM::SPRRegClassID: return ARM::S31;
352 DEBUG(errs() << "Invalid (RegClassID, RawRegister) combination\n");
353 // Encoding error. Mark the builder with error code != 0.
358 ///////////////////////////////
360 // Utility Functions //
362 ///////////////////////////////
364 // Extract/Decode Rd: Inst{15-12}.
365 static inline unsigned decodeRd(uint32_t insn) {
366 return (insn >> ARMII::RegRdShift) & ARMII::GPRRegMask;
369 // Extract/Decode Rn: Inst{19-16}.
370 static inline unsigned decodeRn(uint32_t insn) {
371 return (insn >> ARMII::RegRnShift) & ARMII::GPRRegMask;
374 // Extract/Decode Rm: Inst{3-0}.
375 static inline unsigned decodeRm(uint32_t insn) {
376 return (insn & ARMII::GPRRegMask);
379 // Extract/Decode Rs: Inst{11-8}.
380 static inline unsigned decodeRs(uint32_t insn) {
381 return (insn >> ARMII::RegRsShift) & ARMII::GPRRegMask;
384 static inline unsigned getCondField(uint32_t insn) {
385 return (insn >> ARMII::CondShift);
388 static inline unsigned getIBit(uint32_t insn) {
389 return (insn >> ARMII::I_BitShift) & 1;
392 static inline unsigned getAM3IBit(uint32_t insn) {
393 return (insn >> ARMII::AM3_I_BitShift) & 1;
396 static inline unsigned getPBit(uint32_t insn) {
397 return (insn >> ARMII::P_BitShift) & 1;
400 static inline unsigned getUBit(uint32_t insn) {
401 return (insn >> ARMII::U_BitShift) & 1;
404 static inline unsigned getPUBits(uint32_t insn) {
405 return (insn >> ARMII::U_BitShift) & 3;
408 static inline unsigned getSBit(uint32_t insn) {
409 return (insn >> ARMII::S_BitShift) & 1;
412 static inline unsigned getWBit(uint32_t insn) {
413 return (insn >> ARMII::W_BitShift) & 1;
416 static inline unsigned getDBit(uint32_t insn) {
417 return (insn >> ARMII::D_BitShift) & 1;
420 static inline unsigned getNBit(uint32_t insn) {
421 return (insn >> ARMII::N_BitShift) & 1;
424 static inline unsigned getMBit(uint32_t insn) {
425 return (insn >> ARMII::M_BitShift) & 1;
428 // See A8.4 Shifts applied to a register.
429 // A8.4.2 Register controlled shifts.
431 // getShiftOpcForBits - getShiftOpcForBits translates from the ARM encoding bits
432 // into llvm enums for shift opcode. The API clients should pass in the value
433 // encoded with two bits, so the assert stays to signal a wrong API usage.
435 // A8-12: DecodeRegShift()
436 static inline ARM_AM::ShiftOpc getShiftOpcForBits(unsigned bits) {
438 default: assert(0 && "No such value"); return ARM_AM::no_shift;
439 case 0: return ARM_AM::lsl;
440 case 1: return ARM_AM::lsr;
441 case 2: return ARM_AM::asr;
442 case 3: return ARM_AM::ror;
446 // See A8.4 Shifts applied to a register.
447 // A8.4.1 Constant shifts.
449 // getImmShiftSE - getImmShiftSE translates from the raw ShiftOpc and raw Imm5
450 // encodings into the intended ShiftOpc and shift amount.
452 // A8-11: DecodeImmShift()
453 static inline void getImmShiftSE(ARM_AM::ShiftOpc &ShOp, unsigned &ShImm) {
454 // If type == 0b11 and imm5 == 0, we have an rrx, instead.
455 if (ShOp == ARM_AM::ror && ShImm == 0)
457 // If (lsr or asr) and imm5 == 0, shift amount is 32.
458 if ((ShOp == ARM_AM::lsr || ShOp == ARM_AM::asr) && ShImm == 0)
462 // getAMSubModeForBits - getAMSubModeForBits translates from the ARM encoding
463 // bits Inst{24-23} (P(24) and U(23)) into llvm enums for AMSubMode. The API
464 // clients should pass in the value encoded with two bits, so the assert stays
465 // to signal a wrong API usage.
466 static inline ARM_AM::AMSubMode getAMSubModeForBits(unsigned bits) {
468 default: assert(0 && "No such value"); return ARM_AM::bad_am_submode;
469 case 1: return ARM_AM::ia; // P=0 U=1
470 case 3: return ARM_AM::ib; // P=1 U=1
471 case 0: return ARM_AM::da; // P=0 U=0
472 case 2: return ARM_AM::db; // P=1 U=0
476 ////////////////////////////////////////////
478 // Disassemble function definitions //
480 ////////////////////////////////////////////
482 /// There is a separate Disassemble*Frm function entry for disassembly of an ARM
483 /// instr into a list of MCOperands in the appropriate order, with possible dst,
484 /// followed by possible src(s).
486 /// The processing of the predicate, and the 'S' modifier bit, if MI modifies
487 /// the CPSR, is factored into ARMBasicMCBuilder's method named
488 /// TryPredicateAndSBitModifier.
490 static bool DisassemblePseudo(MCInst &MI, unsigned Opcode, uint32_t insn,
491 unsigned short NumOps, unsigned &NumOpsAdded, BO) {
493 if (Opcode == ARM::Int_MemBarrierV7 || Opcode == ARM::Int_SyncBarrierV7)
496 assert(0 && "Unexpected pseudo instruction!");
500 // Multiply Instructions.
501 // MLA, MLS, SMLABB, SMLABT, SMLATB, SMLATT, SMLAWB, SMLAWT, SMMLA, SMMLS:
502 // Rd{19-16} Rn{3-0} Rm{11-8} Ra{15-12}
504 // MUL, SMMUL, SMULBB, SMULBT, SMULTB, SMULTT, SMULWB, SMULWT:
505 // Rd{19-16} Rn{3-0} Rm{11-8}
507 // SMLAL, SMULL, UMAAL, UMLAL, UMULL, SMLALBB, SMLALBT, SMLALTB, SMLALTT:
508 // RdLo{15-12} RdHi{19-16} Rn{3-0} Rm{11-8}
510 // The mapping of the multiply registers to the "regular" ARM registers, where
511 // there are convenience decoder functions, is:
517 static bool DisassembleMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
518 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
520 const TargetInstrDesc &TID = ARMInsts[Opcode];
521 unsigned short NumDefs = TID.getNumDefs();
522 const TargetOperandInfo *OpInfo = TID.OpInfo;
523 unsigned &OpIdx = NumOpsAdded;
527 assert(NumDefs > 0 && "NumDefs should be greater than 0 for MulFrm");
529 && OpInfo[0].RegClass == ARM::GPRRegClassID
530 && OpInfo[1].RegClass == ARM::GPRRegClassID
531 && OpInfo[2].RegClass == ARM::GPRRegClassID
532 && "Expect three register operands");
534 // Instructions with two destination registers have RdLo{15-12} first.
536 assert(NumOps >= 4 && OpInfo[3].RegClass == ARM::GPRRegClassID &&
537 "Expect 4th register operand");
538 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
543 // The destination register: RdHi{19-16} or Rd{19-16}.
544 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
547 // The two src regsiters: Rn{3-0}, then Rm{11-8}.
548 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
550 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
554 // Many multiply instructions (e.g., MLA) have three src registers.
555 // The third register operand is Ra{15-12}.
556 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) {
557 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
565 // Helper routines for disassembly of coprocessor instructions.
567 static bool LdStCopOpcode(unsigned Opcode) {
568 if ((Opcode >= ARM::LDC2L_OFFSET && Opcode <= ARM::LDC_PRE) ||
569 (Opcode >= ARM::STC2L_OFFSET && Opcode <= ARM::STC_PRE))
573 static bool CoprocessorOpcode(unsigned Opcode) {
574 if (LdStCopOpcode(Opcode))
580 case ARM::CDP: case ARM::CDP2:
581 case ARM::MCR: case ARM::MCR2: case ARM::MRC: case ARM::MRC2:
582 case ARM::MCRR: case ARM::MCRR2: case ARM::MRRC: case ARM::MRRC2:
586 static inline unsigned GetCoprocessor(uint32_t insn) {
587 return slice(insn, 11, 8);
589 static inline unsigned GetCopOpc1(uint32_t insn, bool CDP) {
590 return CDP ? slice(insn, 23, 20) : slice(insn, 23, 21);
592 static inline unsigned GetCopOpc2(uint32_t insn) {
593 return slice(insn, 7, 5);
595 static inline unsigned GetCopOpc(uint32_t insn) {
596 return slice(insn, 7, 4);
598 // Most of the operands are in immediate forms, except Rd and Rn, which are ARM
601 // CDP, CDP2: cop opc1 CRd CRn CRm opc2
603 // MCR, MCR2, MRC, MRC2: cop opc1 Rd CRn CRm opc2
605 // MCRR, MCRR2, MRRC, MRRc2: cop opc Rd Rn CRm
607 // LDC_OFFSET, LDC_PRE, LDC_POST: cop CRd Rn R0 [+/-]imm8:00
609 // STC_OFFSET, STC_PRE, STC_POST: cop CRd Rn R0 [+/-]imm8:00
613 // LDC_OPTION: cop CRd Rn imm8
615 // STC_OPTION: cop CRd Rn imm8
618 static bool DisassembleCoprocessor(MCInst &MI, unsigned Opcode, uint32_t insn,
619 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
621 assert(NumOps >= 5 && "Num of operands >= 5 for coprocessor instr");
623 unsigned &OpIdx = NumOpsAdded;
624 bool OneCopOpc = (Opcode == ARM::MCRR || Opcode == ARM::MCRR2 ||
625 Opcode == ARM::MRRC || Opcode == ARM::MRRC2);
626 // CDP/CDP2 has no GPR operand; the opc1 operand is also wider (Inst{23-20}).
627 bool NoGPR = (Opcode == ARM::CDP || Opcode == ARM::CDP2);
628 bool LdStCop = LdStCopOpcode(Opcode);
632 MI.addOperand(MCOperand::CreateImm(GetCoprocessor(insn)));
635 // Unindex if P:W = 0b00 --> _OPTION variant
636 unsigned PW = getPBit(insn) << 1 | getWBit(insn);
638 MI.addOperand(MCOperand::CreateImm(decodeRd(insn)));
640 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
644 MI.addOperand(MCOperand::CreateReg(0));
645 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
646 unsigned Offset = ARM_AM::getAM2Opc(AddrOpcode, slice(insn, 7, 0) << 2,
648 MI.addOperand(MCOperand::CreateImm(Offset));
651 MI.addOperand(MCOperand::CreateImm(slice(insn, 7, 0)));
655 MI.addOperand(MCOperand::CreateImm(OneCopOpc ? GetCopOpc(insn)
656 : GetCopOpc1(insn, NoGPR)));
658 MI.addOperand(NoGPR ? MCOperand::CreateImm(decodeRd(insn))
659 : MCOperand::CreateReg(
660 getRegisterEnum(B, ARM::GPRRegClassID,
663 MI.addOperand(OneCopOpc ? MCOperand::CreateReg(
664 getRegisterEnum(B, ARM::GPRRegClassID,
666 : MCOperand::CreateImm(decodeRn(insn)));
668 MI.addOperand(MCOperand::CreateImm(decodeRm(insn)));
673 MI.addOperand(MCOperand::CreateImm(GetCopOpc2(insn)));
681 // Branch Instructions.
682 // BLr9: SignExtend(Imm24:'00', 32)
683 // Bcc, BLr9_pred: SignExtend(Imm24:'00', 32) Pred0 Pred1
684 // SMC: ZeroExtend(imm4, 32)
685 // SVC: ZeroExtend(Imm24, 32)
687 // Various coprocessor instructions are assigned BrFrm arbitrarily.
688 // Delegates to DisassembleCoprocessor() helper function.
691 // MSR/MSRsys: Rm mask=Inst{19-16}
693 // MSRi/MSRsysi: so_imm
694 // SRSW/SRS: addrmode4:$addr mode_imm
695 // RFEW/RFE: addrmode4:$addr Rn
696 static bool DisassembleBrFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
697 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
699 if (CoprocessorOpcode(Opcode))
700 return DisassembleCoprocessor(MI, Opcode, insn, NumOps, NumOpsAdded, B);
702 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
703 if (!OpInfo) return false;
705 // MRS and MRSsys take one GPR reg Rd.
706 if (Opcode == ARM::MRS || Opcode == ARM::MRSsys) {
707 assert(NumOps >= 1 && OpInfo[0].RegClass == ARM::GPRRegClassID &&
708 "Reg operand expected");
709 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
714 // BXJ takes one GPR reg Rm.
715 if (Opcode == ARM::BXJ) {
716 assert(NumOps >= 1 && OpInfo[0].RegClass == ARM::GPRRegClassID &&
717 "Reg operand expected");
718 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
723 // MSR and MSRsys take one GPR reg Rm, followed by the mask.
724 if (Opcode == ARM::MSR || Opcode == ARM::MSRsys) {
725 assert(NumOps >= 1 && OpInfo[0].RegClass == ARM::GPRRegClassID &&
726 "Reg operand expected");
727 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
729 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 16)));
733 // MSRi and MSRsysi take one so_imm operand, followed by the mask.
734 if (Opcode == ARM::MSRi || Opcode == ARM::MSRsysi) {
735 // SOImm is 4-bit rotate amount in bits 11-8 with 8-bit imm in bits 7-0.
736 // A5.2.4 Rotate amount is twice the numeric value of Inst{11-8}.
737 // See also ARMAddressingModes.h: getSOImmValImm() and getSOImmValRot().
738 unsigned Rot = (insn >> ARMII::SoRotImmShift) & 0xF;
739 unsigned Imm = insn & 0xFF;
740 MI.addOperand(MCOperand::CreateImm(ARM_AM::rotr32(Imm, 2*Rot)));
741 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 16)));
745 // SRSW and SRS requires addrmode4:$addr for ${addr:submode}, followed by the
746 // mode immediate (Inst{4-0}).
747 if (Opcode == ARM::SRSW || Opcode == ARM::SRS ||
748 Opcode == ARM::RFEW || Opcode == ARM::RFE) {
749 // ARMInstPrinter::printAddrMode4Operand() prints special mode string
750 // if the base register is SP; so don't set ARM::SP.
751 MI.addOperand(MCOperand::CreateReg(0));
752 ARM_AM::AMSubMode SubMode = getAMSubModeForBits(getPUBits(insn));
753 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM4ModeImm(SubMode)));
755 if (Opcode == ARM::SRSW || Opcode == ARM::SRS)
756 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0)));
758 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
764 assert((Opcode == ARM::Bcc || Opcode == ARM::BLr9 || Opcode == ARM::BLr9_pred
765 || Opcode == ARM::SMC || Opcode == ARM::SVC) &&
766 "Unexpected Opcode");
768 assert(NumOps >= 1 && OpInfo[0].RegClass < 0 && "Reg operand expected");
771 if (Opcode == ARM::SMC) {
772 // ZeroExtend(imm4, 32) where imm24 = Inst{3-0}.
773 Imm32 = slice(insn, 3, 0);
774 } else if (Opcode == ARM::SVC) {
775 // ZeroExtend(imm24, 32) where imm24 = Inst{23-0}.
776 Imm32 = slice(insn, 23, 0);
778 // SignExtend(imm24:'00', 32) where imm24 = Inst{23-0}.
779 unsigned Imm26 = slice(insn, 23, 0) << 2;
780 //Imm32 = signextend<signed int, 26>(Imm26);
781 Imm32 = SignExtend32<26>(Imm26);
783 // When executing an ARM instruction, PC reads as the address of the current
784 // instruction plus 8. The assembler subtracts 8 from the difference
785 // between the branch instruction and the target address, disassembler has
786 // to add 8 to compensate.
790 MI.addOperand(MCOperand::CreateImm(Imm32));
796 // Misc. Branch Instructions.
797 // BR_JTadd, BR_JTr, BR_JTm
800 static bool DisassembleBrMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
801 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
803 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
804 if (!OpInfo) return false;
806 unsigned &OpIdx = NumOpsAdded;
810 // BX_RET has only two predicate operands, do an early return.
811 if (Opcode == ARM::BX_RET)
814 // BLXr9 and BRIND take one GPR reg.
815 if (Opcode == ARM::BLXr9 || Opcode == ARM::BRIND) {
816 assert(NumOps >= 1 && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
817 "Reg operand expected");
818 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
824 // BR_JTadd is an ADD with Rd = PC, (Rn, Rm) as the target and index regs.
825 if (Opcode == ARM::BR_JTadd) {
826 // InOperandList with GPR:$target and GPR:$idx regs.
828 assert(NumOps == 4 && "Expect 4 operands");
829 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
831 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
834 // Fill in the two remaining imm operands to signify build completion.
835 MI.addOperand(MCOperand::CreateImm(0));
836 MI.addOperand(MCOperand::CreateImm(0));
842 // BR_JTr is a MOV with Rd = PC, and Rm as the source register.
843 if (Opcode == ARM::BR_JTr) {
844 // InOperandList with GPR::$target reg.
846 assert(NumOps == 3 && "Expect 3 operands");
847 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
850 // Fill in the two remaining imm operands to signify build completion.
851 MI.addOperand(MCOperand::CreateImm(0));
852 MI.addOperand(MCOperand::CreateImm(0));
858 // BR_JTm is an LDR with Rt = PC.
859 if (Opcode == ARM::BR_JTm) {
860 // This is the reg/reg form, with base reg followed by +/- reg shop imm.
861 // See also ARMAddressingModes.h (Addressing Mode #2).
863 assert(NumOps == 5 && getIBit(insn) == 1 && "Expect 5 operands && I-bit=1");
864 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
867 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
869 // Disassemble the offset reg (Rm), shift type, and immediate shift length.
870 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
872 // Inst{6-5} encodes the shift opcode.
873 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
874 // Inst{11-7} encodes the imm5 shift amount.
875 unsigned ShImm = slice(insn, 11, 7);
877 // A8.4.1. Possible rrx or shift amount of 32...
878 getImmShiftSE(ShOp, ShImm);
879 MI.addOperand(MCOperand::CreateImm(
880 ARM_AM::getAM2Opc(AddrOpcode, ShImm, ShOp)));
882 // Fill in the two remaining imm operands to signify build completion.
883 MI.addOperand(MCOperand::CreateImm(0));
884 MI.addOperand(MCOperand::CreateImm(0));
890 assert(0 && "Unexpected BrMiscFrm Opcode");
894 static inline bool getBFCInvMask(uint32_t insn, uint32_t &mask) {
895 uint32_t lsb = slice(insn, 11, 7);
896 uint32_t msb = slice(insn, 20, 16);
899 DEBUG(errs() << "Encoding error: msb < lsb\n");
903 for (uint32_t i = lsb; i <= msb; ++i)
909 static inline bool SaturateOpcode(unsigned Opcode) {
911 case ARM::SSATlsl: case ARM::SSATasr: case ARM::SSAT16:
912 case ARM::USATlsl: case ARM::USATasr: case ARM::USAT16:
919 static inline unsigned decodeSaturatePos(unsigned Opcode, uint32_t insn) {
923 return slice(insn, 20, 16) + 1;
925 return slice(insn, 19, 16) + 1;
928 return slice(insn, 20, 16);
930 return slice(insn, 19, 16);
932 assert(0 && "Invalid opcode passed in");
937 // A major complication is the fact that some of the saturating add/subtract
938 // operations have Rd Rm Rn, instead of the "normal" Rd Rn Rm.
939 // They are QADD, QDADD, QDSUB, and QSUB.
940 static bool DisassembleDPFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
941 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
943 const TargetInstrDesc &TID = ARMInsts[Opcode];
944 unsigned short NumDefs = TID.getNumDefs();
945 bool isUnary = isUnaryDP(TID.TSFlags);
946 const TargetOperandInfo *OpInfo = TID.OpInfo;
947 unsigned &OpIdx = NumOpsAdded;
951 // Disassemble register def if there is one.
952 if (NumDefs && (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID)) {
953 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
958 // Now disassemble the src operands.
962 // SSAT/SSAT16/USAT/USAT16 has imm operand after Rd.
963 if (SaturateOpcode(Opcode)) {
964 MI.addOperand(MCOperand::CreateImm(decodeSaturatePos(Opcode, insn)));
966 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
969 if (Opcode == ARM::SSAT16 || Opcode == ARM::USAT16) {
974 // For SSAT operand reg (Rm) has been disassembled above.
975 // Now disassemble the shift amount.
977 // Inst{11-7} encodes the imm5 shift amount.
978 unsigned ShAmt = slice(insn, 11, 7);
980 // A8.6.183. Possible ASR shift amount of 32...
981 if (Opcode == ARM::SSATasr && ShAmt == 0)
984 MI.addOperand(MCOperand::CreateImm(ShAmt));
990 // Special-case handling of BFC/BFI/SBFX/UBFX.
991 if (Opcode == ARM::BFC || Opcode == ARM::BFI) {
992 MI.addOperand(MCOperand::CreateReg(0));
993 if (Opcode == ARM::BFI) {
994 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
999 if (!getBFCInvMask(insn, mask))
1002 MI.addOperand(MCOperand::CreateImm(mask));
1006 if (Opcode == ARM::SBFX || Opcode == ARM::UBFX) {
1007 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1009 MI.addOperand(MCOperand::CreateImm(slice(insn, 11, 7)));
1010 MI.addOperand(MCOperand::CreateImm(slice(insn, 20, 16) + 1));
1015 bool RmRn = (Opcode == ARM::QADD || Opcode == ARM::QDADD ||
1016 Opcode == ARM::QDSUB || Opcode == ARM::QSUB);
1018 // BinaryDP has an Rn operand.
1020 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1021 "Reg operand expected");
1022 MI.addOperand(MCOperand::CreateReg(
1023 getRegisterEnum(B, ARM::GPRRegClassID,
1024 RmRn ? decodeRm(insn) : decodeRn(insn))));
1028 // If this is a two-address operand, skip it, e.g., MOVCCr operand 1.
1029 if (isUnary && (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)) {
1030 MI.addOperand(MCOperand::CreateReg(0));
1034 // Now disassemble operand 2.
1035 if (OpIdx >= NumOps)
1038 if (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) {
1039 // We have a reg/reg form.
1040 // Assert disabled because saturating operations, e.g., A8.6.127 QASX, are
1041 // routed here as well.
1042 // assert(getIBit(insn) == 0 && "I_Bit != '0' reg/reg form");
1043 MI.addOperand(MCOperand::CreateReg(
1044 getRegisterEnum(B, ARM::GPRRegClassID,
1045 RmRn? decodeRn(insn) : decodeRm(insn))));
1047 } else if (Opcode == ARM::MOVi16 || Opcode == ARM::MOVTi16) {
1048 // We have an imm16 = imm4:imm12 (imm4=Inst{19:16}, imm12 = Inst{11:0}).
1049 assert(getIBit(insn) == 1 && "I_Bit != '1' reg/imm form");
1050 unsigned Imm16 = slice(insn, 19, 16) << 12 | slice(insn, 11, 0);
1051 MI.addOperand(MCOperand::CreateImm(Imm16));
1054 // We have a reg/imm form.
1055 // SOImm is 4-bit rotate amount in bits 11-8 with 8-bit imm in bits 7-0.
1056 // A5.2.4 Rotate amount is twice the numeric value of Inst{11-8}.
1057 // See also ARMAddressingModes.h: getSOImmValImm() and getSOImmValRot().
1058 assert(getIBit(insn) == 1 && "I_Bit != '1' reg/imm form");
1059 unsigned Rot = (insn >> ARMII::SoRotImmShift) & 0xF;
1060 unsigned Imm = insn & 0xFF;
1061 MI.addOperand(MCOperand::CreateImm(ARM_AM::rotr32(Imm, 2*Rot)));
1068 static bool DisassembleDPSoRegFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1069 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1071 const TargetInstrDesc &TID = ARMInsts[Opcode];
1072 unsigned short NumDefs = TID.getNumDefs();
1073 bool isUnary = isUnaryDP(TID.TSFlags);
1074 const TargetOperandInfo *OpInfo = TID.OpInfo;
1075 unsigned &OpIdx = NumOpsAdded;
1079 // Disassemble register def if there is one.
1080 if (NumDefs && (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID)) {
1081 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1086 // Disassemble the src operands.
1087 if (OpIdx >= NumOps)
1090 // BinaryDP has an Rn operand.
1092 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1093 "Reg operand expected");
1094 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1099 // If this is a two-address operand, skip it, e.g., MOVCCs operand 1.
1100 if (isUnary && (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)) {
1101 MI.addOperand(MCOperand::CreateReg(0));
1105 // Disassemble operand 2, which consists of three components.
1106 if (OpIdx + 2 >= NumOps)
1109 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
1110 (OpInfo[OpIdx+1].RegClass == ARM::GPRRegClassID) &&
1111 (OpInfo[OpIdx+2].RegClass < 0) &&
1112 "Expect 3 reg operands");
1114 // Register-controlled shifts have Inst{7} = 0 and Inst{4} = 1.
1115 unsigned Rs = slice(insn, 4, 4);
1117 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1120 // Register-controlled shifts: [Rm, Rs, shift].
1121 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1123 // Inst{6-5} encodes the shift opcode.
1124 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1125 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(ShOp, 0)));
1127 // Constant shifts: [Rm, reg0, shift_imm].
1128 MI.addOperand(MCOperand::CreateReg(0)); // NoRegister
1129 // Inst{6-5} encodes the shift opcode.
1130 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1131 // Inst{11-7} encodes the imm5 shift amount.
1132 unsigned ShImm = slice(insn, 11, 7);
1134 // A8.4.1. Possible rrx or shift amount of 32...
1135 getImmShiftSE(ShOp, ShImm);
1136 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(ShOp, ShImm)));
1143 static bool DisassembleLdStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1144 unsigned short NumOps, unsigned &NumOpsAdded, bool isStore, BO B) {
1146 const TargetInstrDesc &TID = ARMInsts[Opcode];
1147 bool isPrePost = isPrePostLdSt(TID.TSFlags);
1148 const TargetOperandInfo *OpInfo = TID.OpInfo;
1149 if (!OpInfo) return false;
1151 unsigned &OpIdx = NumOpsAdded;
1155 assert(((!isStore && TID.getNumDefs() > 0) ||
1156 (isStore && (TID.getNumDefs() == 0 || isPrePost)))
1157 && "Invalid arguments");
1159 // Operand 0 of a pre- and post-indexed store is the address base writeback.
1160 if (isPrePost && isStore) {
1161 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1162 "Reg operand expected");
1163 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1168 // Disassemble the dst/src operand.
1169 if (OpIdx >= NumOps)
1172 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1173 "Reg operand expected");
1174 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1178 // After dst of a pre- and post-indexed load is the address base writeback.
1179 if (isPrePost && !isStore) {
1180 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1181 "Reg operand expected");
1182 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1187 // Disassemble the base operand.
1188 if (OpIdx >= NumOps)
1191 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1192 "Reg operand expected");
1193 assert((!isPrePost || (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1))
1194 && "Index mode or tied_to operand expected");
1195 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1199 // For reg/reg form, base reg is followed by +/- reg shop imm.
1200 // For immediate form, it is followed by +/- imm12.
1201 // See also ARMAddressingModes.h (Addressing Mode #2).
1202 if (OpIdx + 1 >= NumOps)
1205 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
1206 (OpInfo[OpIdx+1].RegClass < 0) &&
1207 "Expect 1 reg operand followed by 1 imm operand");
1209 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1210 if (getIBit(insn) == 0) {
1211 MI.addOperand(MCOperand::CreateReg(0));
1213 // Disassemble the 12-bit immediate offset.
1214 unsigned Imm12 = slice(insn, 11, 0);
1215 unsigned Offset = ARM_AM::getAM2Opc(AddrOpcode, Imm12, ARM_AM::no_shift);
1216 MI.addOperand(MCOperand::CreateImm(Offset));
1218 // Disassemble the offset reg (Rm), shift type, and immediate shift length.
1219 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1221 // Inst{6-5} encodes the shift opcode.
1222 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1223 // Inst{11-7} encodes the imm5 shift amount.
1224 unsigned ShImm = slice(insn, 11, 7);
1226 // A8.4.1. Possible rrx or shift amount of 32...
1227 getImmShiftSE(ShOp, ShImm);
1228 MI.addOperand(MCOperand::CreateImm(
1229 ARM_AM::getAM2Opc(AddrOpcode, ShImm, ShOp)));
1236 static bool DisassembleLdFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1237 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1238 return DisassembleLdStFrm(MI, Opcode, insn, NumOps, NumOpsAdded, false, B);
1241 static bool DisassembleStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1242 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1243 return DisassembleLdStFrm(MI, Opcode, insn, NumOps, NumOpsAdded, true, B);
1246 static bool HasDualReg(unsigned Opcode) {
1250 case ARM::LDRD: case ARM::LDRD_PRE: case ARM::LDRD_POST:
1251 case ARM::STRD: case ARM::STRD_PRE: case ARM::STRD_POST:
1256 static bool DisassembleLdStMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1257 unsigned short NumOps, unsigned &NumOpsAdded, bool isStore, BO B) {
1259 const TargetInstrDesc &TID = ARMInsts[Opcode];
1260 bool isPrePost = isPrePostLdSt(TID.TSFlags);
1261 const TargetOperandInfo *OpInfo = TID.OpInfo;
1262 if (!OpInfo) return false;
1264 unsigned &OpIdx = NumOpsAdded;
1268 assert(((!isStore && TID.getNumDefs() > 0) ||
1269 (isStore && (TID.getNumDefs() == 0 || isPrePost)))
1270 && "Invalid arguments");
1272 // Operand 0 of a pre- and post-indexed store is the address base writeback.
1273 if (isPrePost && isStore) {
1274 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1275 "Reg operand expected");
1276 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1281 bool DualReg = HasDualReg(Opcode);
1283 // Disassemble the dst/src operand.
1284 if (OpIdx >= NumOps)
1287 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1288 "Reg operand expected");
1289 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1293 // Fill in LDRD and STRD's second operand.
1295 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1296 decodeRd(insn) + 1)));
1300 // After dst of a pre- and post-indexed load is the address base writeback.
1301 if (isPrePost && !isStore) {
1302 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1303 "Reg operand expected");
1304 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1309 // Disassemble the base operand.
1310 if (OpIdx >= NumOps)
1313 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1314 "Reg operand expected");
1315 assert((!isPrePost || (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1))
1316 && "Index mode or tied_to operand expected");
1317 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1321 // For reg/reg form, base reg is followed by +/- reg.
1322 // For immediate form, it is followed by +/- imm8.
1323 // See also ARMAddressingModes.h (Addressing Mode #3).
1324 if (OpIdx + 1 >= NumOps)
1327 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
1328 (OpInfo[OpIdx+1].RegClass < 0) &&
1329 "Expect 1 reg operand followed by 1 imm operand");
1331 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1332 if (getAM3IBit(insn) == 1) {
1333 MI.addOperand(MCOperand::CreateReg(0));
1335 // Disassemble the 8-bit immediate offset.
1336 unsigned Imm4H = (insn >> ARMII::ImmHiShift) & 0xF;
1337 unsigned Imm4L = insn & 0xF;
1338 unsigned Offset = ARM_AM::getAM3Opc(AddrOpcode, (Imm4H << 4) | Imm4L);
1339 MI.addOperand(MCOperand::CreateImm(Offset));
1341 // Disassemble the offset reg (Rm).
1342 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1344 unsigned Offset = ARM_AM::getAM3Opc(AddrOpcode, 0);
1345 MI.addOperand(MCOperand::CreateImm(Offset));
1352 static bool DisassembleLdMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1353 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1354 return DisassembleLdStMiscFrm(MI, Opcode, insn, NumOps, NumOpsAdded, false,
1358 static bool DisassembleStMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1359 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1360 return DisassembleLdStMiscFrm(MI, Opcode, insn, NumOps, NumOpsAdded, true, B);
1363 // The algorithm for disassembly of LdStMulFrm is different from others because
1364 // it explicitly populates the two predicate operands after operand 0 (the base)
1365 // and operand 1 (the AM4 mode imm). After operand 3, we need to populate the
1366 // reglist with each affected register encoded as an MCOperand.
1367 static bool DisassembleLdStMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1368 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1370 assert(NumOps >= 5 && "LdStMulFrm expects NumOps >= 5");
1372 unsigned &OpIdx = NumOpsAdded;
1376 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1378 // Writeback to base, if necessary.
1379 if (Opcode == ARM::LDM_UPD || Opcode == ARM::STM_UPD) {
1380 MI.addOperand(MCOperand::CreateReg(Base));
1384 MI.addOperand(MCOperand::CreateReg(Base));
1386 ARM_AM::AMSubMode SubMode = getAMSubModeForBits(getPUBits(insn));
1387 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM4ModeImm(SubMode)));
1389 // Handling the two predicate operands before the reglist.
1390 int64_t CondVal = insn >> ARMII::CondShift;
1391 MI.addOperand(MCOperand::CreateImm(CondVal == 0xF ? 0xE : CondVal));
1392 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
1396 // Fill the variadic part of reglist.
1397 unsigned RegListBits = insn & ((1 << 16) - 1);
1398 for (unsigned i = 0; i < 16; ++i) {
1399 if ((RegListBits >> i) & 1) {
1400 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1409 // LDREX, LDREXB, LDREXH: Rd Rn
1410 // LDREXD: Rd Rd+1 Rn
1411 // STREX, STREXB, STREXH: Rd Rm Rn
1412 // STREXD: Rd Rm Rm+1 Rn
1414 // SWP, SWPB: Rd Rm Rn
1415 static bool DisassembleLdStExFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1416 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1418 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1419 if (!OpInfo) return false;
1421 unsigned &OpIdx = NumOpsAdded;
1426 && OpInfo[0].RegClass == ARM::GPRRegClassID
1427 && OpInfo[1].RegClass == ARM::GPRRegClassID
1428 && "Expect 2 reg operands");
1430 bool isStore = slice(insn, 20, 20) == 0;
1431 bool isDW = (Opcode == ARM::LDREXD || Opcode == ARM::STREXD);
1433 // Add the destination operand.
1434 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1438 // Store register Exclusive needs a source operand.
1440 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1445 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1446 decodeRm(insn)+1)));
1450 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1451 decodeRd(insn)+1)));
1455 // Finally add the pointer operand.
1456 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1463 // Misc. Arithmetic Instructions.
1465 // PKHBT, PKHTB: Rd Rn Rm , LSL/ASR #imm5
1466 // RBIT, REV, REV16, REVSH: Rd Rm
1467 static bool DisassembleArithMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1468 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1470 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1471 unsigned &OpIdx = NumOpsAdded;
1476 && OpInfo[0].RegClass == ARM::GPRRegClassID
1477 && OpInfo[1].RegClass == ARM::GPRRegClassID
1478 && "Expect 2 reg operands");
1480 bool ThreeReg = NumOps > 2 && OpInfo[2].RegClass == ARM::GPRRegClassID;
1482 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1487 assert(NumOps >= 4 && "Expect >= 4 operands");
1488 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1493 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1497 // If there is still an operand info left which is an immediate operand, add
1498 // an additional imm5 LSL/ASR operand.
1499 if (ThreeReg && OpInfo[OpIdx].RegClass < 0
1500 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1501 // Extract the 5-bit immediate field Inst{11-7}.
1502 unsigned ShiftAmt = (insn >> ARMII::ShiftShift) & 0x1F;
1503 MI.addOperand(MCOperand::CreateImm(ShiftAmt));
1510 // Extend instructions.
1511 // SXT* and UXT*: Rd [Rn] Rm [rot_imm].
1512 // The 2nd operand register is Rn and the 3rd operand regsiter is Rm for the
1513 // three register operand form. Otherwise, Rn=0b1111 and only Rm is used.
1514 static bool DisassembleExtFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1515 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1517 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1518 unsigned &OpIdx = NumOpsAdded;
1523 && OpInfo[0].RegClass == ARM::GPRRegClassID
1524 && OpInfo[1].RegClass == ARM::GPRRegClassID
1525 && "Expect 2 reg operands");
1527 bool ThreeReg = NumOps > 2 && OpInfo[2].RegClass == ARM::GPRRegClassID;
1529 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1534 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1539 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1543 // If there is still an operand info left which is an immediate operand, add
1544 // an additional rotate immediate operand.
1545 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
1546 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1547 // Extract the 2-bit rotate field Inst{11-10}.
1548 unsigned rot = (insn >> ARMII::ExtRotImmShift) & 3;
1549 // Rotation by 8, 16, or 24 bits.
1550 MI.addOperand(MCOperand::CreateImm(rot << 3));
1557 /////////////////////////////////////
1559 // Utility Functions For VFP //
1561 /////////////////////////////////////
1563 // Extract/Decode Dd/Sd:
1565 // SP => d = UInt(Vd:D)
1566 // DP => d = UInt(D:Vd)
1567 static unsigned decodeVFPRd(uint32_t insn, bool isSPVFP) {
1568 return isSPVFP ? (decodeRd(insn) << 1 | getDBit(insn))
1569 : (decodeRd(insn) | getDBit(insn) << 4);
1572 // Extract/Decode Dn/Sn:
1574 // SP => n = UInt(Vn:N)
1575 // DP => n = UInt(N:Vn)
1576 static unsigned decodeVFPRn(uint32_t insn, bool isSPVFP) {
1577 return isSPVFP ? (decodeRn(insn) << 1 | getNBit(insn))
1578 : (decodeRn(insn) | getNBit(insn) << 4);
1581 // Extract/Decode Dm/Sm:
1583 // SP => m = UInt(Vm:M)
1584 // DP => m = UInt(M:Vm)
1585 static unsigned decodeVFPRm(uint32_t insn, bool isSPVFP) {
1586 return isSPVFP ? (decodeRm(insn) << 1 | getMBit(insn))
1587 : (decodeRm(insn) | getMBit(insn) << 4);
1592 static uint64_t VFPExpandImm(unsigned char byte, unsigned N) {
1593 assert(N == 32 || N == 64);
1596 unsigned bit6 = slice(byte, 6, 6);
1598 Result = slice(byte, 7, 7) << 31 | slice(byte, 5, 0) << 19;
1600 Result |= 0x1f << 25;
1602 Result |= 0x1 << 30;
1604 Result = (uint64_t)slice(byte, 7, 7) << 63 |
1605 (uint64_t)slice(byte, 5, 0) << 48;
1607 Result |= 0xffL << 54;
1609 Result |= 0x1L << 62;
1615 // VFP Unary Format Instructions:
1617 // VCMP[E]ZD, VCMP[E]ZS: compares one floating-point register with zero
1618 // VCVTDS, VCVTSD: converts between double-precision and single-precision
1619 // The rest of the instructions have homogeneous [VFP]Rd and [VFP]Rm registers.
1620 static bool DisassembleVFPUnaryFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1621 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1623 assert(NumOps >= 1 && "VFPUnaryFrm expects NumOps >= 1");
1625 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1626 unsigned &OpIdx = NumOpsAdded;
1630 unsigned RegClass = OpInfo[OpIdx].RegClass;
1631 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1632 "Reg operand expected");
1633 bool isSP = (RegClass == ARM::SPRRegClassID);
1635 MI.addOperand(MCOperand::CreateReg(
1636 getRegisterEnum(B, RegClass, decodeVFPRd(insn, isSP))));
1639 // Early return for compare with zero instructions.
1640 if (Opcode == ARM::VCMPEZD || Opcode == ARM::VCMPEZS
1641 || Opcode == ARM::VCMPZD || Opcode == ARM::VCMPZS)
1644 RegClass = OpInfo[OpIdx].RegClass;
1645 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1646 "Reg operand expected");
1647 isSP = (RegClass == ARM::SPRRegClassID);
1649 MI.addOperand(MCOperand::CreateReg(
1650 getRegisterEnum(B, RegClass, decodeVFPRm(insn, isSP))));
1656 // All the instructions have homogeneous [VFP]Rd, [VFP]Rn, and [VFP]Rm regs.
1657 // Some of them have operand constraints which tie the first operand in the
1658 // InOperandList to that of the dst. As far as asm printing is concerned, this
1659 // tied_to operand is simply skipped.
1660 static bool DisassembleVFPBinaryFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1661 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1663 assert(NumOps >= 3 && "VFPBinaryFrm expects NumOps >= 3");
1665 const TargetInstrDesc &TID = ARMInsts[Opcode];
1666 const TargetOperandInfo *OpInfo = TID.OpInfo;
1667 unsigned &OpIdx = NumOpsAdded;
1671 unsigned RegClass = OpInfo[OpIdx].RegClass;
1672 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1673 "Reg operand expected");
1674 bool isSP = (RegClass == ARM::SPRRegClassID);
1676 MI.addOperand(MCOperand::CreateReg(
1677 getRegisterEnum(B, RegClass, decodeVFPRd(insn, isSP))));
1680 // Skip tied_to operand constraint.
1681 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
1682 assert(NumOps >= 4 && "Expect >=4 operands");
1683 MI.addOperand(MCOperand::CreateReg(0));
1687 MI.addOperand(MCOperand::CreateReg(
1688 getRegisterEnum(B, RegClass, decodeVFPRn(insn, isSP))));
1691 MI.addOperand(MCOperand::CreateReg(
1692 getRegisterEnum(B, RegClass, decodeVFPRm(insn, isSP))));
1698 // A8.6.295 vcvt (floating-point <-> integer)
1699 // Int to FP: VSITOD, VSITOS, VUITOD, VUITOS
1700 // FP to Int: VTOSI[Z|R]D, VTOSI[Z|R]S, VTOUI[Z|R]D, VTOUI[Z|R]S
1702 // A8.6.297 vcvt (floating-point and fixed-point)
1703 // Dd|Sd Dd|Sd(TIED_TO) #fbits(= 16|32 - UInt(imm4:i))
1704 static bool DisassembleVFPConv1Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1705 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1707 assert(NumOps >= 2 && "VFPConv1Frm expects NumOps >= 2");
1709 const TargetInstrDesc &TID = ARMInsts[Opcode];
1710 const TargetOperandInfo *OpInfo = TID.OpInfo;
1711 if (!OpInfo) return false;
1713 bool SP = slice(insn, 8, 8) == 0; // A8.6.295 & A8.6.297
1714 bool fixed_point = slice(insn, 17, 17) == 1; // A8.6.297
1715 unsigned RegClassID = SP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1719 assert(NumOps >= 3 && "Expect >= 3 operands");
1720 int size = slice(insn, 7, 7) == 0 ? 16 : 32;
1721 int fbits = size - (slice(insn,3,0) << 1 | slice(insn,5,5));
1722 MI.addOperand(MCOperand::CreateReg(
1723 getRegisterEnum(B, RegClassID,
1724 decodeVFPRd(insn, SP))));
1726 assert(TID.getOperandConstraint(1, TOI::TIED_TO) != -1 &&
1727 "Tied to operand expected");
1728 MI.addOperand(MI.getOperand(0));
1730 assert(OpInfo[2].RegClass < 0 && !OpInfo[2].isPredicate() &&
1731 !OpInfo[2].isOptionalDef() && "Imm operand expected");
1732 MI.addOperand(MCOperand::CreateImm(fbits));
1737 // The Rd (destination) and Rm (source) bits have different interpretations
1738 // depending on their single-precisonness.
1740 if (slice(insn, 18, 18) == 1) { // to_integer operation
1741 d = decodeVFPRd(insn, true /* Is Single Precision */);
1742 MI.addOperand(MCOperand::CreateReg(
1743 getRegisterEnum(B, ARM::SPRRegClassID, d)));
1744 m = decodeVFPRm(insn, SP);
1745 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, m)));
1747 d = decodeVFPRd(insn, SP);
1748 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, d)));
1749 m = decodeVFPRm(insn, true /* Is Single Precision */);
1750 MI.addOperand(MCOperand::CreateReg(
1751 getRegisterEnum(B, ARM::SPRRegClassID, m)));
1759 // VMOVRS - A8.6.330
1760 // Rt => Rd; Sn => UInt(Vn:N)
1761 static bool DisassembleVFPConv2Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1762 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1764 assert(NumOps >= 2 && "VFPConv2Frm expects NumOps >= 2");
1766 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1768 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1769 decodeVFPRn(insn, true))));
1774 // VMOVRRD - A8.6.332
1775 // Rt => Rd; Rt2 => Rn; Dm => UInt(M:Vm)
1777 // VMOVRRS - A8.6.331
1778 // Rt => Rd; Rt2 => Rn; Sm => UInt(Vm:M); Sm1 = Sm+1
1779 static bool DisassembleVFPConv3Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1780 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1782 assert(NumOps >= 3 && "VFPConv3Frm expects NumOps >= 3");
1784 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1785 unsigned &OpIdx = NumOpsAdded;
1787 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1789 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1793 if (OpInfo[OpIdx].RegClass == ARM::SPRRegClassID) {
1794 unsigned Sm = decodeVFPRm(insn, true);
1795 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1797 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1801 MI.addOperand(MCOperand::CreateReg(
1802 getRegisterEnum(B, ARM::DPRRegClassID,
1803 decodeVFPRm(insn, false))));
1809 // VMOVSR - A8.6.330
1810 // Rt => Rd; Sn => UInt(Vn:N)
1811 static bool DisassembleVFPConv4Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1812 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1814 assert(NumOps >= 2 && "VFPConv4Frm expects NumOps >= 2");
1816 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1817 decodeVFPRn(insn, true))));
1818 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1824 // VMOVDRR - A8.6.332
1825 // Rt => Rd; Rt2 => Rn; Dm => UInt(M:Vm)
1827 // VMOVRRS - A8.6.331
1828 // Rt => Rd; Rt2 => Rn; Sm => UInt(Vm:M); Sm1 = Sm+1
1829 static bool DisassembleVFPConv5Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1830 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1832 assert(NumOps >= 3 && "VFPConv5Frm expects NumOps >= 3");
1834 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1835 unsigned &OpIdx = NumOpsAdded;
1839 if (OpInfo[OpIdx].RegClass == ARM::SPRRegClassID) {
1840 unsigned Sm = decodeVFPRm(insn, true);
1841 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1843 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1847 MI.addOperand(MCOperand::CreateReg(
1848 getRegisterEnum(B, ARM::DPRRegClassID,
1849 decodeVFPRm(insn, false))));
1853 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1855 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1861 // VFP Load/Store Instructions.
1862 // VLDRD, VLDRS, VSTRD, VSTRS
1863 static bool DisassembleVFPLdStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1864 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1866 assert(NumOps >= 3 && "VFPLdStFrm expects NumOps >= 3");
1868 bool isSPVFP = (Opcode == ARM::VLDRS || Opcode == ARM::VSTRS) ? true : false;
1869 unsigned RegClassID = isSPVFP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1871 // Extract Dd/Sd for operand 0.
1872 unsigned RegD = decodeVFPRd(insn, isSPVFP);
1874 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, RegD)));
1876 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1877 MI.addOperand(MCOperand::CreateReg(Base));
1879 // Next comes the AM5 Opcode.
1880 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1881 unsigned char Imm8 = insn & 0xFF;
1882 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(AddrOpcode, Imm8)));
1889 // VFP Load/Store Multiple Instructions.
1890 // This is similar to the algorithm for LDM/STM in that operand 0 (the base) and
1891 // operand 1 (the AM5 mode imm) is followed by two predicate operands. It is
1892 // followed by a reglist of either DPR(s) or SPR(s).
1894 // VLDMD[_UPD], VLDMS[_UPD], VSTMD[_UPD], VSTMS[_UPD]
1895 static bool DisassembleVFPLdStMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1896 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1898 assert(NumOps >= 5 && "VFPLdStMulFrm expects NumOps >= 5");
1900 unsigned &OpIdx = NumOpsAdded;
1904 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1906 // Writeback to base, if necessary.
1907 if (Opcode == ARM::VLDMD_UPD || Opcode == ARM::VLDMS_UPD ||
1908 Opcode == ARM::VSTMD_UPD || Opcode == ARM::VSTMS_UPD) {
1909 MI.addOperand(MCOperand::CreateReg(Base));
1913 MI.addOperand(MCOperand::CreateReg(Base));
1915 // Next comes the AM5 Opcode.
1916 ARM_AM::AMSubMode SubMode = getAMSubModeForBits(getPUBits(insn));
1917 // Must be either "ia" or "db" submode.
1918 if (SubMode != ARM_AM::ia && SubMode != ARM_AM::db) {
1919 DEBUG(errs() << "Illegal addressing mode 5 sub-mode!\n");
1923 unsigned char Imm8 = insn & 0xFF;
1924 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(SubMode, Imm8)));
1926 // Handling the two predicate operands before the reglist.
1927 int64_t CondVal = insn >> ARMII::CondShift;
1928 MI.addOperand(MCOperand::CreateImm(CondVal == 0xF ? 0xE : CondVal));
1929 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
1933 bool isSPVFP = (Opcode == ARM::VLDMS || Opcode == ARM::VLDMS_UPD ||
1934 Opcode == ARM::VSTMS || Opcode == ARM::VSTMS_UPD) ? true : false;
1935 unsigned RegClassID = isSPVFP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1938 unsigned RegD = decodeVFPRd(insn, isSPVFP);
1940 // Fill the variadic part of reglist.
1941 unsigned Regs = isSPVFP ? Imm8 : Imm8/2;
1942 for (unsigned i = 0; i < Regs; ++i) {
1943 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID,
1951 // Misc. VFP Instructions.
1952 // FMSTAT (vmrs with Rt=0b1111, i.e., to apsr_nzcv and no register operand)
1953 // FCONSTD (DPR and a VFPf64Imm operand)
1954 // FCONSTS (SPR and a VFPf32Imm operand)
1955 // VMRS/VMSR (GPR operand)
1956 static bool DisassembleVFPMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1957 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1959 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1960 unsigned &OpIdx = NumOpsAdded;
1964 if (Opcode == ARM::FMSTAT)
1967 assert(NumOps >= 2 && "VFPMiscFrm expects >=2 operands");
1969 unsigned RegEnum = 0;
1970 switch (OpInfo[0].RegClass) {
1971 case ARM::DPRRegClassID:
1972 RegEnum = getRegisterEnum(B, ARM::DPRRegClassID, decodeVFPRd(insn, false));
1974 case ARM::SPRRegClassID:
1975 RegEnum = getRegisterEnum(B, ARM::SPRRegClassID, decodeVFPRd(insn, true));
1977 case ARM::GPRRegClassID:
1978 RegEnum = getRegisterEnum(B, ARM::GPRRegClassID, decodeRd(insn));
1981 assert(0 && "Invalid reg class id");
1985 MI.addOperand(MCOperand::CreateReg(RegEnum));
1988 // Extract/decode the f64/f32 immediate.
1989 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
1990 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1991 // The asm syntax specifies the before-expanded <imm>.
1992 // Not VFPExpandImm(slice(insn,19,16) << 4 | slice(insn, 3, 0),
1993 // Opcode == ARM::FCONSTD ? 64 : 32)
1994 MI.addOperand(MCOperand::CreateImm(slice(insn,19,16)<<4 | slice(insn,3,0)));
2001 // DisassembleThumbFrm() is defined in ThumbDisassemblerCore.h file.
2002 #include "ThumbDisassemblerCore.h"
2004 /////////////////////////////////////////////////////
2006 // Utility Functions For ARM Advanced SIMD //
2008 /////////////////////////////////////////////////////
2010 // The following NEON namings are based on A8.6.266 VABA, VABAL. Notice that
2011 // A8.6.303 VDUP (ARM core register)'s D/Vd pair is the N/Vn pair of VABA/VABAL.
2013 // A7.3 Register encoding
2015 // Extract/Decode NEON D/Vd:
2017 // Note that for quadword, Qd = UInt(D:Vd<3:1>) = Inst{22:15-13}, whereas for
2018 // doubleword, Dd = UInt(D:Vd). We compensate for this difference by
2019 // handling it in the getRegisterEnum() utility function.
2020 // D = Inst{22}, Vd = Inst{15-12}
2021 static unsigned decodeNEONRd(uint32_t insn) {
2022 return ((insn >> ARMII::NEON_D_BitShift) & 1) << 4
2023 | ((insn >> ARMII::NEON_RegRdShift) & ARMII::NEONRegMask);
2026 // Extract/Decode NEON N/Vn:
2028 // Note that for quadword, Qn = UInt(N:Vn<3:1>) = Inst{7:19-17}, whereas for
2029 // doubleword, Dn = UInt(N:Vn). We compensate for this difference by
2030 // handling it in the getRegisterEnum() utility function.
2031 // N = Inst{7}, Vn = Inst{19-16}
2032 static unsigned decodeNEONRn(uint32_t insn) {
2033 return ((insn >> ARMII::NEON_N_BitShift) & 1) << 4
2034 | ((insn >> ARMII::NEON_RegRnShift) & ARMII::NEONRegMask);
2037 // Extract/Decode NEON M/Vm:
2039 // Note that for quadword, Qm = UInt(M:Vm<3:1>) = Inst{5:3-1}, whereas for
2040 // doubleword, Dm = UInt(M:Vm). We compensate for this difference by
2041 // handling it in the getRegisterEnum() utility function.
2042 // M = Inst{5}, Vm = Inst{3-0}
2043 static unsigned decodeNEONRm(uint32_t insn) {
2044 return ((insn >> ARMII::NEON_M_BitShift) & 1) << 4
2045 | ((insn >> ARMII::NEON_RegRmShift) & ARMII::NEONRegMask);
2056 } // End of unnamed namespace
2058 // size field -> Inst{11-10}
2059 // index_align field -> Inst{7-4}
2061 // The Lane Index interpretation depends on the Data Size:
2062 // 8 (encoded as size = 0b00) -> Index = index_align[3:1]
2063 // 16 (encoded as size = 0b01) -> Index = index_align[3:2]
2064 // 32 (encoded as size = 0b10) -> Index = index_align[3]
2066 // Ref: A8.6.317 VLD4 (single 4-element structure to one lane).
2067 static unsigned decodeLaneIndex(uint32_t insn) {
2068 unsigned size = insn >> 10 & 3;
2069 assert((size == 0 || size == 1 || size == 2) &&
2070 "Encoding error: size should be either 0, 1, or 2");
2072 unsigned index_align = insn >> 4 & 0xF;
2073 return (index_align >> 1) >> size;
2076 // imm64 = AdvSIMDExpandImm(op, cmode, i:imm3:imm4)
2077 // op = Inst{5}, cmode = Inst{11-8}
2078 // i = Inst{24} (ARM architecture)
2079 // imm3 = Inst{18-16}, imm4 = Inst{3-0}
2080 // Ref: Table A7-15 Modified immediate values for Advanced SIMD instructions.
2081 static uint64_t decodeN1VImm(uint32_t insn, ElemSize esize) {
2082 unsigned char op = (insn >> 5) & 1;
2083 unsigned char cmode = (insn >> 8) & 0xF;
2084 unsigned char Imm8 = ((insn >> 24) & 1) << 7 |
2085 ((insn >> 16) & 7) << 4 |
2087 return (op << 12) | (cmode << 8) | Imm8;
2090 // A8.6.339 VMUL, VMULL (by scalar)
2091 // ESize16 => m = Inst{2-0} (Vm<2:0>) D0-D7
2092 // ESize32 => m = Inst{3-0} (Vm<3:0>) D0-D15
2093 static unsigned decodeRestrictedDm(uint32_t insn, ElemSize esize) {
2100 assert(0 && "Unreachable code!");
2105 // A8.6.339 VMUL, VMULL (by scalar)
2106 // ESize16 => index = Inst{5:3} (M:Vm<3>) D0-D7
2107 // ESize32 => index = Inst{5} (M) D0-D15
2108 static unsigned decodeRestrictedDmIndex(uint32_t insn, ElemSize esize) {
2111 return (((insn >> 5) & 1) << 1) | ((insn >> 3) & 1);
2113 return (insn >> 5) & 1;
2115 assert(0 && "Unreachable code!");
2120 // A8.6.296 VCVT (between floating-point and fixed-point, Advanced SIMD)
2121 // (64 - <fbits>) is encoded as imm6, i.e., Inst{21-16}.
2122 static unsigned decodeVCVTFractionBits(uint32_t insn) {
2123 return 64 - ((insn >> 16) & 0x3F);
2126 // A8.6.302 VDUP (scalar)
2127 // ESize8 => index = Inst{19-17}
2128 // ESize16 => index = Inst{19-18}
2129 // ESize32 => index = Inst{19}
2130 static unsigned decodeNVLaneDupIndex(uint32_t insn, ElemSize esize) {
2133 return (insn >> 17) & 7;
2135 return (insn >> 18) & 3;
2137 return (insn >> 19) & 1;
2139 assert(0 && "Unspecified element size!");
2144 // A8.6.328 VMOV (ARM core register to scalar)
2145 // A8.6.329 VMOV (scalar to ARM core register)
2146 // ESize8 => index = Inst{21:6-5}
2147 // ESize16 => index = Inst{21:6}
2148 // ESize32 => index = Inst{21}
2149 static unsigned decodeNVLaneOpIndex(uint32_t insn, ElemSize esize) {
2152 return ((insn >> 21) & 1) << 2 | ((insn >> 5) & 3);
2154 return ((insn >> 21) & 1) << 1 | ((insn >> 6) & 1);
2156 return ((insn >> 21) & 1);
2158 assert(0 && "Unspecified element size!");
2163 // Imm6 = Inst{21-16}, L = Inst{7}
2165 // LeftShift == true (A8.6.367 VQSHL, A8.6.387 VSLI):
2167 // '0001xxx' => esize = 8; shift_amount = imm6 - 8
2168 // '001xxxx' => esize = 16; shift_amount = imm6 - 16
2169 // '01xxxxx' => esize = 32; shift_amount = imm6 - 32
2170 // '1xxxxxx' => esize = 64; shift_amount = imm6
2172 // LeftShift == false (A8.6.376 VRSHR, A8.6.368 VQSHRN):
2174 // '0001xxx' => esize = 8; shift_amount = 16 - imm6
2175 // '001xxxx' => esize = 16; shift_amount = 32 - imm6
2176 // '01xxxxx' => esize = 32; shift_amount = 64 - imm6
2177 // '1xxxxxx' => esize = 64; shift_amount = 64 - imm6
2179 static unsigned decodeNVSAmt(uint32_t insn, bool LeftShift) {
2180 ElemSize esize = ESizeNA;
2181 unsigned L = (insn >> 7) & 1;
2182 unsigned imm6 = (insn >> 16) & 0x3F;
2186 else if (imm6 >> 4 == 1)
2188 else if (imm6 >> 5 == 1)
2191 assert(0 && "Wrong encoding of Inst{7:21-16}!");
2196 return esize == ESize64 ? imm6 : (imm6 - esize);
2198 return esize == ESize64 ? (esize - imm6) : (2*esize - imm6);
2202 // Imm4 = Inst{11-8}
2203 static unsigned decodeN3VImm(uint32_t insn) {
2204 return (insn >> 8) & 0xF;
2207 static bool UseDRegPair(unsigned Opcode) {
2211 case ARM::VLD1q8_UPD:
2212 case ARM::VLD1q16_UPD:
2213 case ARM::VLD1q32_UPD:
2214 case ARM::VLD1q64_UPD:
2215 case ARM::VST1q8_UPD:
2216 case ARM::VST1q16_UPD:
2217 case ARM::VST1q32_UPD:
2218 case ARM::VST1q64_UPD:
2224 // D[d] D[d2] ... Rn [TIED_TO Rn] align [Rm]
2226 // D[d] D[d2] ... Rn [TIED_TO Rn] align [Rm] TIED_TO ... imm(idx)
2228 // Rn [TIED_TO Rn] align [Rm] D[d] D[d2] ...
2230 // Rn [TIED_TO Rn] align [Rm] D[d] D[d2] ... [imm(idx)]
2232 // Correctly set VLD*/VST*'s TIED_TO GPR, as the asm printer needs it.
2233 static bool DisassembleNLdSt0(MCInst &MI, unsigned Opcode, uint32_t insn,
2234 unsigned short NumOps, unsigned &NumOpsAdded, bool Store, bool DblSpaced,
2237 const TargetInstrDesc &TID = ARMInsts[Opcode];
2238 const TargetOperandInfo *OpInfo = TID.OpInfo;
2240 // At least one DPR register plus addressing mode #6.
2241 assert(NumOps >= 3 && "Expect >= 3 operands");
2243 unsigned &OpIdx = NumOpsAdded;
2247 // We have homogeneous NEON registers for Load/Store.
2248 unsigned RegClass = 0;
2250 // Double-spaced registers have increments of 2.
2251 unsigned Inc = DblSpaced ? 2 : 1;
2253 unsigned Rn = decodeRn(insn);
2254 unsigned Rm = decodeRm(insn);
2255 unsigned Rd = decodeNEONRd(insn);
2257 // A7.7.1 Advanced SIMD addressing mode.
2260 // LLVM Addressing Mode #6.
2261 unsigned RmEnum = 0;
2263 RmEnum = getRegisterEnum(B, ARM::GPRRegClassID, Rm);
2266 // Consume possible WB, AddrMode6, possible increment reg, the DPR/QPR's,
2267 // then possible lane index.
2268 assert(OpIdx < NumOps && OpInfo[0].RegClass == ARM::GPRRegClassID &&
2269 "Reg operand expected");
2272 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2277 assert((OpIdx+1) < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
2278 OpInfo[OpIdx + 1].RegClass < 0 && "Addrmode #6 Operands expected");
2279 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2281 MI.addOperand(MCOperand::CreateImm(0)); // Alignment ignored?
2285 MI.addOperand(MCOperand::CreateReg(RmEnum));
2289 assert(OpIdx < NumOps &&
2290 (OpInfo[OpIdx].RegClass == ARM::DPRRegClassID ||
2291 OpInfo[OpIdx].RegClass == ARM::QPRRegClassID) &&
2292 "Reg operand expected");
2294 RegClass = OpInfo[OpIdx].RegClass;
2295 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2296 MI.addOperand(MCOperand::CreateReg(
2297 getRegisterEnum(B, RegClass, Rd,
2298 UseDRegPair(Opcode))));
2303 // Handle possible lane index.
2304 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2305 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2306 MI.addOperand(MCOperand::CreateImm(decodeLaneIndex(insn)));
2311 // Consume the DPR/QPR's, possible WB, AddrMode6, possible incrment reg,
2312 // possible TIED_TO DPR/QPR's (ignored), then possible lane index.
2313 RegClass = OpInfo[0].RegClass;
2315 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2316 MI.addOperand(MCOperand::CreateReg(
2317 getRegisterEnum(B, RegClass, Rd,
2318 UseDRegPair(Opcode))));
2324 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2329 assert((OpIdx+1) < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
2330 OpInfo[OpIdx + 1].RegClass < 0 && "Addrmode #6 Operands expected");
2331 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2333 MI.addOperand(MCOperand::CreateImm(0)); // Alignment ignored?
2337 MI.addOperand(MCOperand::CreateReg(RmEnum));
2341 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2342 assert(TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1 &&
2343 "Tied to operand expected");
2344 MI.addOperand(MCOperand::CreateReg(0));
2348 // Handle possible lane index.
2349 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2350 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2351 MI.addOperand(MCOperand::CreateImm(decodeLaneIndex(insn)));
2360 // If L (Inst{21}) == 0, store instructions.
2361 // Find out about double-spaced-ness of the Opcode and pass it on to
2362 // DisassembleNLdSt0().
2363 static bool DisassembleNLdSt(MCInst &MI, unsigned Opcode, uint32_t insn,
2364 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2366 const StringRef Name = ARMInsts[Opcode].Name;
2367 bool DblSpaced = false;
2369 if (Name.find("LN") != std::string::npos) {
2370 // To one lane instructions.
2371 // See, for example, 8.6.317 VLD4 (single 4-element structure to one lane).
2373 // <size> == 16 && Inst{5} == 1 --> DblSpaced = true
2374 if (Name.endswith("16") || Name.endswith("16_UPD"))
2375 DblSpaced = slice(insn, 5, 5) == 1;
2377 // <size> == 32 && Inst{6} == 1 --> DblSpaced = true
2378 if (Name.endswith("32") || Name.endswith("32_UPD"))
2379 DblSpaced = slice(insn, 6, 6) == 1;
2382 // Multiple n-element structures with type encoded as Inst{11-8}.
2383 // See, for example, A8.6.316 VLD4 (multiple 4-element structures).
2385 // n == 2 && type == 0b1001 -> DblSpaced = true
2386 if (Name.startswith("VST2") || Name.startswith("VLD2"))
2387 DblSpaced = slice(insn, 11, 8) == 9;
2389 // n == 3 && type == 0b0101 -> DblSpaced = true
2390 if (Name.startswith("VST3") || Name.startswith("VLD3"))
2391 DblSpaced = slice(insn, 11, 8) == 5;
2393 // n == 4 && type == 0b0001 -> DblSpaced = true
2394 if (Name.startswith("VST4") || Name.startswith("VLD4"))
2395 DblSpaced = slice(insn, 11, 8) == 1;
2398 return DisassembleNLdSt0(MI, Opcode, insn, NumOps, NumOpsAdded,
2399 slice(insn, 21, 21) == 0, DblSpaced, B);
2404 static bool DisassembleN1RegModImmFrm(MCInst &MI, unsigned Opcode,
2405 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2407 const TargetInstrDesc &TID = ARMInsts[Opcode];
2408 const TargetOperandInfo *OpInfo = TID.OpInfo;
2410 assert(NumOps >= 2 &&
2411 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2412 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2413 (OpInfo[1].RegClass < 0) &&
2414 "Expect 1 reg operand followed by 1 imm operand");
2416 // Qd/Dd = Inst{22:15-12} => NEON Rd
2417 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[0].RegClass,
2418 decodeNEONRd(insn))));
2420 ElemSize esize = ESizeNA;
2423 case ARM::VMOVv16i8:
2426 case ARM::VMOVv4i16:
2427 case ARM::VMOVv8i16:
2430 case ARM::VMOVv2i32:
2431 case ARM::VMOVv4i32:
2434 case ARM::VMOVv1i64:
2435 case ARM::VMOVv2i64:
2439 assert(0 && "Unreachable code!");
2443 // One register and a modified immediate value.
2444 // Add the imm operand.
2445 MI.addOperand(MCOperand::CreateImm(decodeN1VImm(insn, esize)));
2455 N2V_VectorConvert_Between_Float_Fixed
2457 } // End of unnamed namespace
2459 // Vector Convert [between floating-point and fixed-point]
2460 // Qd/Dd Qm/Dm [fbits]
2462 // Vector Duplicate Lane (from scalar to all elements) Instructions.
2463 // VDUPLN16d, VDUPLN16q, VDUPLN32d, VDUPLN32q, VDUPLN8d, VDUPLN8q:
2466 // Vector Move Long:
2469 // Vector Move Narrow:
2473 static bool DisassembleNVdVmOptImm(MCInst &MI, unsigned Opc, uint32_t insn,
2474 unsigned short NumOps, unsigned &NumOpsAdded, N2VFlag Flag, BO B) {
2476 const TargetInstrDesc &TID = ARMInsts[Opc];
2477 const TargetOperandInfo *OpInfo = TID.OpInfo;
2479 assert(NumOps >= 2 &&
2480 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2481 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2482 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2483 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2484 "Expect >= 2 operands and first 2 as reg operands");
2486 unsigned &OpIdx = NumOpsAdded;
2490 ElemSize esize = ESizeNA;
2491 if (Flag == N2V_VectorDupLane) {
2492 // VDUPLN has its index embedded. Its size can be inferred from the Opcode.
2493 assert(Opc >= ARM::VDUPLN16d && Opc <= ARM::VDUPLN8q &&
2494 "Unexpected Opcode");
2495 esize = (Opc == ARM::VDUPLN8d || Opc == ARM::VDUPLN8q) ? ESize8
2496 : ((Opc == ARM::VDUPLN16d || Opc == ARM::VDUPLN16q) ? ESize16
2500 // Qd/Dd = Inst{22:15-12} => NEON Rd
2501 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2502 decodeNEONRd(insn))));
2506 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2508 MI.addOperand(MCOperand::CreateReg(0));
2512 // Dm = Inst{5:3-0} => NEON Rm
2513 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2514 decodeNEONRm(insn))));
2517 // VZIP and others have two TIED_TO reg operands.
2519 while (OpIdx < NumOps &&
2520 (Idx = TID.getOperandConstraint(OpIdx, TOI::TIED_TO)) != -1) {
2521 // Add TIED_TO operand.
2522 MI.addOperand(MI.getOperand(Idx));
2526 // Add the imm operand, if required.
2527 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2528 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2530 unsigned imm = 0xFFFFFFFF;
2532 if (Flag == N2V_VectorDupLane)
2533 imm = decodeNVLaneDupIndex(insn, esize);
2534 if (Flag == N2V_VectorConvert_Between_Float_Fixed)
2535 imm = decodeVCVTFractionBits(insn);
2537 assert(imm != 0xFFFFFFFF && "Internal error");
2538 MI.addOperand(MCOperand::CreateImm(imm));
2545 static bool DisassembleN2RegFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2546 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2548 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2551 static bool DisassembleNVCVTFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2552 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2554 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2555 N2V_VectorConvert_Between_Float_Fixed, B);
2557 static bool DisassembleNVecDupLnFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2558 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2560 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2561 N2V_VectorDupLane, B);
2564 // Vector Shift [Accumulate] Instructions.
2565 // Qd/Dd [Qd/Dd (TIED_TO)] Qm/Dm ShiftAmt
2567 // Vector Shift Left Long (with maximum shift count) Instructions.
2568 // VSHLLi16, VSHLLi32, VSHLLi8: Qd Dm imm (== size)
2570 static bool DisassembleNVectorShift(MCInst &MI, unsigned Opcode, uint32_t insn,
2571 unsigned short NumOps, unsigned &NumOpsAdded, bool LeftShift, BO B) {
2573 const TargetInstrDesc &TID = ARMInsts[Opcode];
2574 const TargetOperandInfo *OpInfo = TID.OpInfo;
2576 assert(NumOps >= 3 &&
2577 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2578 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2579 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2580 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2581 "Expect >= 3 operands and first 2 as reg operands");
2583 unsigned &OpIdx = NumOpsAdded;
2587 // Qd/Dd = Inst{22:15-12} => NEON Rd
2588 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2589 decodeNEONRd(insn))));
2592 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2594 MI.addOperand(MCOperand::CreateReg(0));
2598 assert((OpInfo[OpIdx].RegClass == ARM::DPRRegClassID ||
2599 OpInfo[OpIdx].RegClass == ARM::QPRRegClassID) &&
2600 "Reg operand expected");
2602 // Qm/Dm = Inst{5:3-0} => NEON Rm
2603 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2604 decodeNEONRm(insn))));
2607 assert(OpInfo[OpIdx].RegClass < 0 && "Imm operand expected");
2609 // Add the imm operand.
2611 // VSHLL has maximum shift count as the imm, inferred from its size.
2615 Imm = decodeNVSAmt(insn, LeftShift);
2627 MI.addOperand(MCOperand::CreateImm(Imm));
2633 // Left shift instructions.
2634 static bool DisassembleN2RegVecShLFrm(MCInst &MI, unsigned Opcode,
2635 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2637 return DisassembleNVectorShift(MI, Opcode, insn, NumOps, NumOpsAdded, true,
2640 // Right shift instructions have different shift amount interpretation.
2641 static bool DisassembleN2RegVecShRFrm(MCInst &MI, unsigned Opcode,
2642 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2644 return DisassembleNVectorShift(MI, Opcode, insn, NumOps, NumOpsAdded, false,
2653 N3V_Multiply_By_Scalar
2655 } // End of unnamed namespace
2657 // NEON Three Register Instructions with Optional Immediate Operand
2659 // Vector Extract Instructions.
2660 // Qd/Dd Qn/Dn Qm/Dm imm4
2662 // Vector Shift (Register) Instructions.
2663 // Qd/Dd Qm/Dm Qn/Dn (notice the order of m, n)
2665 // Vector Multiply [Accumulate/Subtract] [Long] By Scalar Instructions.
2666 // Qd/Dd Qn/Dn RestrictedDm index
2669 static bool DisassembleNVdVnVmOptImm(MCInst &MI, unsigned Opcode, uint32_t insn,
2670 unsigned short NumOps, unsigned &NumOpsAdded, N3VFlag Flag, BO B) {
2672 const TargetInstrDesc &TID = ARMInsts[Opcode];
2673 const TargetOperandInfo *OpInfo = TID.OpInfo;
2675 // No checking for OpInfo[2] because of MOVDneon/MOVQ with only two regs.
2676 assert(NumOps >= 3 &&
2677 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2678 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2679 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2680 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2681 "Expect >= 3 operands and first 2 as reg operands");
2683 unsigned &OpIdx = NumOpsAdded;
2687 bool VdVnVm = Flag == N3V_VectorShift ? false : true;
2688 bool IsImm4 = Flag == N3V_VectorExtract ? true : false;
2689 bool IsDmRestricted = Flag == N3V_Multiply_By_Scalar ? true : false;
2690 ElemSize esize = ESizeNA;
2691 if (Flag == N3V_Multiply_By_Scalar) {
2692 unsigned size = (insn >> 20) & 3;
2693 if (size == 1) esize = ESize16;
2694 if (size == 2) esize = ESize32;
2695 assert (esize == ESize16 || esize == ESize32);
2698 // Qd/Dd = Inst{22:15-12} => NEON Rd
2699 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2700 decodeNEONRd(insn))));
2703 // VABA, VABAL, VBSLd, VBSLq, ...
2704 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2706 MI.addOperand(MCOperand::CreateReg(0));
2710 // Dn = Inst{7:19-16} => NEON Rn
2712 // Dm = Inst{5:3-0} => NEON Rm
2713 MI.addOperand(MCOperand::CreateReg(
2714 getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2715 VdVnVm ? decodeNEONRn(insn)
2716 : decodeNEONRm(insn))));
2719 // Special case handling for VMOVDneon and VMOVQ because they are marked as
2721 if (Opcode == ARM::VMOVDneon || Opcode == ARM::VMOVQ)
2724 // Dm = Inst{5:3-0} => NEON Rm
2726 // Dm is restricted to D0-D7 if size is 16, D0-D15 otherwise
2728 // Dn = Inst{7:19-16} => NEON Rn
2729 unsigned m = VdVnVm ? (IsDmRestricted ? decodeRestrictedDm(insn, esize)
2730 : decodeNEONRm(insn))
2731 : decodeNEONRn(insn);
2733 MI.addOperand(MCOperand::CreateReg(
2734 getRegisterEnum(B, OpInfo[OpIdx].RegClass, m)));
2737 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2738 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2739 // Add the imm operand.
2742 Imm = decodeN3VImm(insn);
2743 else if (IsDmRestricted)
2744 Imm = decodeRestrictedDmIndex(insn, esize);
2746 assert(0 && "Internal error: unreachable code!");
2750 MI.addOperand(MCOperand::CreateImm(Imm));
2757 static bool DisassembleN3RegFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2758 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2760 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2763 static bool DisassembleN3RegVecShFrm(MCInst &MI, unsigned Opcode,
2764 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2766 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2767 N3V_VectorShift, B);
2769 static bool DisassembleNVecExtractFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2770 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2772 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2773 N3V_VectorExtract, B);
2775 static bool DisassembleNVecMulScalarFrm(MCInst &MI, unsigned Opcode,
2776 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2778 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2779 N3V_Multiply_By_Scalar, B);
2782 // Vector Table Lookup
2784 // VTBL1, VTBX1: Dd [Dd(TIED_TO)] Dn Dm
2785 // VTBL2, VTBX2: Dd [Dd(TIED_TO)] Dn Dn+1 Dm
2786 // VTBL3, VTBX3: Dd [Dd(TIED_TO)] Dn Dn+1 Dn+2 Dm
2787 // VTBL4, VTBX4: Dd [Dd(TIED_TO)] Dn Dn+1 Dn+2 Dn+3 Dm
2788 static bool DisassembleNVTBLFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2789 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2791 const TargetInstrDesc &TID = ARMInsts[Opcode];
2792 const TargetOperandInfo *OpInfo = TID.OpInfo;
2793 if (!OpInfo) return false;
2795 assert(NumOps >= 3 &&
2796 OpInfo[0].RegClass == ARM::DPRRegClassID &&
2797 OpInfo[1].RegClass == ARM::DPRRegClassID &&
2798 OpInfo[2].RegClass == ARM::DPRRegClassID &&
2799 "Expect >= 3 operands and first 3 as reg operands");
2801 unsigned &OpIdx = NumOpsAdded;
2805 unsigned Rn = decodeNEONRn(insn);
2807 // {Dn} encoded as len = 0b00
2808 // {Dn Dn+1} encoded as len = 0b01
2809 // {Dn Dn+1 Dn+2 } encoded as len = 0b10
2810 // {Dn Dn+1 Dn+2 Dn+3} encoded as len = 0b11
2811 unsigned Len = slice(insn, 9, 8) + 1;
2813 // Dd (the destination vector)
2814 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2815 decodeNEONRd(insn))));
2818 // Process tied_to operand constraint.
2820 if ((Idx = TID.getOperandConstraint(OpIdx, TOI::TIED_TO)) != -1) {
2821 MI.addOperand(MI.getOperand(Idx));
2825 // Do the <list> now.
2826 for (unsigned i = 0; i < Len; ++i) {
2827 assert(OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::DPRRegClassID &&
2828 "Reg operand expected");
2829 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2834 // Dm (the index vector)
2835 assert(OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::DPRRegClassID &&
2836 "Reg operand (index vector) expected");
2837 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2838 decodeNEONRm(insn))));
2844 // Vector Get Lane (move scalar to ARM core register) Instructions.
2845 // VGETLNi32, VGETLNs16, VGETLNs8, VGETLNu16, VGETLNu8: Rt Dn index
2846 static bool DisassembleNGetLnFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2847 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2849 const TargetInstrDesc &TID = ARMInsts[Opcode];
2850 const TargetOperandInfo *OpInfo = TID.OpInfo;
2851 if (!OpInfo) return false;
2853 assert(TID.getNumDefs() == 1 && NumOps >= 3 &&
2854 OpInfo[0].RegClass == ARM::GPRRegClassID &&
2855 OpInfo[1].RegClass == ARM::DPRRegClassID &&
2856 OpInfo[2].RegClass < 0 &&
2857 "Expect >= 3 operands with one dst operand");
2860 Opcode == ARM::VGETLNi32 ? ESize32
2861 : ((Opcode == ARM::VGETLNs16 || Opcode == ARM::VGETLNu16) ? ESize16
2864 // Rt = Inst{15-12} => ARM Rd
2865 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2868 // Dn = Inst{7:19-16} => NEON Rn
2869 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2870 decodeNEONRn(insn))));
2872 MI.addOperand(MCOperand::CreateImm(decodeNVLaneOpIndex(insn, esize)));
2878 // Vector Set Lane (move ARM core register to scalar) Instructions.
2879 // VSETLNi16, VSETLNi32, VSETLNi8: Dd Dd (TIED_TO) Rt index
2880 static bool DisassembleNSetLnFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2881 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2883 const TargetInstrDesc &TID = ARMInsts[Opcode];
2884 const TargetOperandInfo *OpInfo = TID.OpInfo;
2885 if (!OpInfo) return false;
2887 assert(TID.getNumDefs() == 1 && NumOps >= 3 &&
2888 OpInfo[0].RegClass == ARM::DPRRegClassID &&
2889 OpInfo[1].RegClass == ARM::DPRRegClassID &&
2890 TID.getOperandConstraint(1, TOI::TIED_TO) != -1 &&
2891 OpInfo[2].RegClass == ARM::GPRRegClassID &&
2892 OpInfo[3].RegClass < 0 &&
2893 "Expect >= 3 operands with one dst operand");
2896 Opcode == ARM::VSETLNi8 ? ESize8
2897 : (Opcode == ARM::VSETLNi16 ? ESize16
2900 // Dd = Inst{7:19-16} => NEON Rn
2901 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2902 decodeNEONRn(insn))));
2905 MI.addOperand(MCOperand::CreateReg(0));
2907 // Rt = Inst{15-12} => ARM Rd
2908 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2911 MI.addOperand(MCOperand::CreateImm(decodeNVLaneOpIndex(insn, esize)));
2917 // Vector Duplicate Instructions (from ARM core register to all elements).
2918 // VDUP8d, VDUP16d, VDUP32d, VDUP8q, VDUP16q, VDUP32q: Qd/Dd Rt
2919 static bool DisassembleNDupFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2920 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2922 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
2924 assert(NumOps >= 2 &&
2925 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2926 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2927 OpInfo[1].RegClass == ARM::GPRRegClassID &&
2928 "Expect >= 2 operands and first 2 as reg operand");
2930 unsigned RegClass = OpInfo[0].RegClass;
2932 // Qd/Dd = Inst{7:19-16} => NEON Rn
2933 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClass,
2934 decodeNEONRn(insn))));
2936 // Rt = Inst{15-12} => ARM Rd
2937 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2947 static inline bool MemBarrierInstr(uint32_t insn) {
2948 unsigned op7_4 = slice(insn, 7, 4);
2949 if (slice(insn, 31, 20) == 0xf57 && (op7_4 >= 4 && op7_4 <= 6))
2955 static inline bool PreLoadOpcode(unsigned Opcode) {
2957 case ARM::PLDi: case ARM::PLDr:
2958 case ARM::PLDWi: case ARM::PLDWr:
2959 case ARM::PLIi: case ARM::PLIr:
2966 static bool DisassemblePreLoadFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2967 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2969 // Preload Data/Instruction requires either 2 or 4 operands.
2970 // PLDi, PLDWi, PLIi: Rn [+/-]imm12 add = (U == '1')
2971 // PLDr[a|m], PLDWr[a|m], PLIr[a|m]: Rn Rm addrmode2_opc
2973 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2976 if (Opcode == ARM::PLDi || Opcode == ARM::PLDWi || Opcode == ARM::PLIi) {
2977 unsigned Imm12 = slice(insn, 11, 0);
2978 bool Negative = getUBit(insn) == 0;
2979 int Offset = Negative ? -1 - Imm12 : 1 * Imm12;
2980 MI.addOperand(MCOperand::CreateImm(Offset));
2983 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2986 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
2988 // Inst{6-5} encodes the shift opcode.
2989 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
2990 // Inst{11-7} encodes the imm5 shift amount.
2991 unsigned ShImm = slice(insn, 11, 7);
2993 // A8.4.1. Possible rrx or shift amount of 32...
2994 getImmShiftSE(ShOp, ShImm);
2995 MI.addOperand(MCOperand::CreateImm(
2996 ARM_AM::getAM2Opc(AddrOpcode, ShImm, ShOp)));
3003 static bool DisassembleMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3004 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3006 if (MemBarrierInstr(insn))
3024 // CPS has a singleton $opt operand that contains the following information:
3025 // opt{4-0} = mode from Inst{4-0}
3026 // opt{5} = changemode from Inst{17}
3027 // opt{8-6} = AIF from Inst{8-6}
3028 // opt{10-9} = imod from Inst{19-18} with 0b10 as enable and 0b11 as disable
3029 if (Opcode == ARM::CPS) {
3030 unsigned Option = slice(insn, 4, 0) | slice(insn, 17, 17) << 5 |
3031 slice(insn, 8, 6) << 6 | slice(insn, 19, 18) << 9;
3032 MI.addOperand(MCOperand::CreateImm(Option));
3037 // DBG has its option specified in Inst{3-0}.
3038 if (Opcode == ARM::DBG) {
3039 MI.addOperand(MCOperand::CreateImm(slice(insn, 3, 0)));
3044 // BKPT takes an imm32 val equal to ZeroExtend(Inst{19-8:3-0}).
3045 if (Opcode == ARM::BKPT) {
3046 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 8) << 4 |
3047 slice(insn, 3, 0)));
3052 if (PreLoadOpcode(Opcode))
3053 return DisassemblePreLoadFrm(MI, Opcode, insn, NumOps, NumOpsAdded, B);
3055 assert(0 && "Unexpected misc instruction!");
3059 /// FuncPtrs - FuncPtrs maps ARMFormat to its corresponding DisassembleFP.
3060 /// We divide the disassembly task into different categories, with each one
3061 /// corresponding to a specific instruction encoding format. There could be
3062 /// exceptions when handling a specific format, and that is why the Opcode is
3063 /// also present in the function prototype.
3064 static const DisassembleFP FuncPtrs[] = {
3068 &DisassembleBrMiscFrm,
3070 &DisassembleDPSoRegFrm,
3073 &DisassembleLdMiscFrm,
3074 &DisassembleStMiscFrm,
3075 &DisassembleLdStMulFrm,
3076 &DisassembleLdStExFrm,
3077 &DisassembleArithMiscFrm,
3079 &DisassembleVFPUnaryFrm,
3080 &DisassembleVFPBinaryFrm,
3081 &DisassembleVFPConv1Frm,
3082 &DisassembleVFPConv2Frm,
3083 &DisassembleVFPConv3Frm,
3084 &DisassembleVFPConv4Frm,
3085 &DisassembleVFPConv5Frm,
3086 &DisassembleVFPLdStFrm,
3087 &DisassembleVFPLdStMulFrm,
3088 &DisassembleVFPMiscFrm,
3089 &DisassembleThumbFrm,
3090 &DisassembleMiscFrm,
3091 &DisassembleNGetLnFrm,
3092 &DisassembleNSetLnFrm,
3093 &DisassembleNDupFrm,
3095 // VLD and VST (including one lane) Instructions.
3098 // A7.4.6 One register and a modified immediate value
3099 // 1-Register Instructions with imm.
3100 // LLVM only defines VMOVv instructions.
3101 &DisassembleN1RegModImmFrm,
3103 // 2-Register Instructions with no imm.
3104 &DisassembleN2RegFrm,
3106 // 2-Register Instructions with imm (vector convert float/fixed point).
3107 &DisassembleNVCVTFrm,
3109 // 2-Register Instructions with imm (vector dup lane).
3110 &DisassembleNVecDupLnFrm,
3112 // Vector Shift Left Instructions.
3113 &DisassembleN2RegVecShLFrm,
3115 // Vector Shift Righ Instructions, which has different interpretation of the
3116 // shift amount from the imm6 field.
3117 &DisassembleN2RegVecShRFrm,
3119 // 3-Register Data-Processing Instructions.
3120 &DisassembleN3RegFrm,
3122 // Vector Shift (Register) Instructions.
3123 // D:Vd M:Vm N:Vn (notice that M:Vm is the first operand)
3124 &DisassembleN3RegVecShFrm,
3126 // Vector Extract Instructions.
3127 &DisassembleNVecExtractFrm,
3129 // Vector [Saturating Rounding Doubling] Multiply [Accumulate/Subtract] [Long]
3130 // By Scalar Instructions.
3131 &DisassembleNVecMulScalarFrm,
3133 // Vector Table Lookup uses byte indexes in a control vector to look up byte
3134 // values in a table and generate a new vector.
3135 &DisassembleNVTBLFrm,
3140 /// BuildIt - BuildIt performs the build step for this ARM Basic MC Builder.
3141 /// The general idea is to set the Opcode for the MCInst, followed by adding
3142 /// the appropriate MCOperands to the MCInst. ARM Basic MC Builder delegates
3143 /// to the Format-specific disassemble function for disassembly, followed by
3144 /// TryPredicateAndSBitModifier() to do PredicateOperand and OptionalDefOperand
3145 /// which follow the Dst/Src Operands.
3146 bool ARMBasicMCBuilder::BuildIt(MCInst &MI, uint32_t insn) {
3147 // Stage 1 sets the Opcode.
3148 MI.setOpcode(Opcode);
3149 // If the number of operands is zero, we're done!
3153 // Stage 2 calls the format-specific disassemble function to build the operand
3157 unsigned NumOpsAdded = 0;
3158 bool OK = (*Disasm)(MI, Opcode, insn, NumOps, NumOpsAdded, this);
3160 if (!OK || this->Err != 0) return false;
3161 if (NumOpsAdded >= NumOps)
3164 // Stage 3 deals with operands unaccounted for after stage 2 is finished.
3165 // FIXME: Should this be done selectively?
3166 return TryPredicateAndSBitModifier(MI, Opcode, insn, NumOps - NumOpsAdded);
3169 // A8.3 Conditional execution
3170 // A8.3.1 Pseudocode details of conditional execution
3171 // Condition bits '111x' indicate the instruction is always executed.
3172 static uint32_t CondCode(uint32_t CondField) {
3173 if (CondField == 0xF)
3178 /// DoPredicateOperands - DoPredicateOperands process the predicate operands
3179 /// of some Thumb instructions which come before the reglist operands. It
3180 /// returns true if the two predicate operands have been processed.
3181 bool ARMBasicMCBuilder::DoPredicateOperands(MCInst& MI, unsigned Opcode,
3182 uint32_t /* insn */, unsigned short NumOpsRemaining) {
3184 assert(NumOpsRemaining > 0 && "Invalid argument");
3186 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3187 unsigned Idx = MI.getNumOperands();
3189 // First, we check whether this instr specifies the PredicateOperand through
3190 // a pair of TargetOperandInfos with isPredicate() property.
3191 if (NumOpsRemaining >= 2 &&
3192 OpInfo[Idx].isPredicate() && OpInfo[Idx+1].isPredicate() &&
3193 OpInfo[Idx].RegClass < 0 &&
3194 OpInfo[Idx+1].RegClass == ARM::CCRRegClassID)
3196 // If we are inside an IT block, get the IT condition bits maintained via
3197 // ARMBasicMCBuilder::ITState[7:0], through ARMBasicMCBuilder::GetITCond().
3200 MI.addOperand(MCOperand::CreateImm(GetITCond()));
3202 MI.addOperand(MCOperand::CreateImm(ARMCC::AL));
3203 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
3210 /// TryPredicateAndSBitModifier - TryPredicateAndSBitModifier tries to process
3211 /// the possible Predicate and SBitModifier, to build the remaining MCOperand
3213 bool ARMBasicMCBuilder::TryPredicateAndSBitModifier(MCInst& MI, unsigned Opcode,
3214 uint32_t insn, unsigned short NumOpsRemaining) {
3216 assert(NumOpsRemaining > 0 && "Invalid argument");
3218 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3219 const std::string &Name = ARMInsts[Opcode].Name;
3220 unsigned Idx = MI.getNumOperands();
3222 // First, we check whether this instr specifies the PredicateOperand through
3223 // a pair of TargetOperandInfos with isPredicate() property.
3224 if (NumOpsRemaining >= 2 &&
3225 OpInfo[Idx].isPredicate() && OpInfo[Idx+1].isPredicate() &&
3226 OpInfo[Idx].RegClass < 0 &&
3227 OpInfo[Idx+1].RegClass == ARM::CCRRegClassID)
3229 // If we are inside an IT block, get the IT condition bits maintained via
3230 // ARMBasicMCBuilder::ITState[7:0], through ARMBasicMCBuilder::GetITCond().
3233 MI.addOperand(MCOperand::CreateImm(GetITCond()));
3235 if (Name.length() > 1 && Name[0] == 't') {
3236 // Thumb conditional branch instructions have their cond field embedded,
3240 if (Name == "t2Bcc")
3241 MI.addOperand(MCOperand::CreateImm(CondCode(slice(insn, 25, 22))));
3242 else if (Name == "tBcc")
3243 MI.addOperand(MCOperand::CreateImm(CondCode(slice(insn, 11, 8))));
3245 MI.addOperand(MCOperand::CreateImm(ARMCC::AL));
3247 // ARM instructions get their condition field from Inst{31-28}.
3248 MI.addOperand(MCOperand::CreateImm(CondCode(getCondField(insn))));
3251 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
3253 NumOpsRemaining -= 2;
3256 if (NumOpsRemaining == 0)
3259 // Next, if OptionalDefOperand exists, we check whether the 'S' bit is set.
3260 if (OpInfo[Idx].isOptionalDef() && OpInfo[Idx].RegClass==ARM::CCRRegClassID) {
3261 MI.addOperand(MCOperand::CreateReg(getSBit(insn) == 1 ? ARM::CPSR : 0));
3265 if (NumOpsRemaining == 0)
3271 /// RunBuildAfterHook - RunBuildAfterHook performs operations deemed necessary
3272 /// after BuildIt is finished.
3273 bool ARMBasicMCBuilder::RunBuildAfterHook(bool Status, MCInst &MI,
3276 if (!SP) return Status;
3278 if (Opcode == ARM::t2IT)
3279 Status = SP->InitIT(slice(insn, 7, 0)) ? Status : false;
3280 else if (InITBlock())
3286 /// Opcode, Format, and NumOperands make up an ARM Basic MCBuilder.
3287 ARMBasicMCBuilder::ARMBasicMCBuilder(unsigned opc, ARMFormat format,
3289 : Opcode(opc), Format(format), NumOps(num), SP(0), Err(0) {
3290 unsigned Idx = (unsigned)format;
3291 assert(Idx < (array_lengthof(FuncPtrs) - 1) && "Unknown format");
3292 Disasm = FuncPtrs[Idx];
3295 /// CreateMCBuilder - Return an ARMBasicMCBuilder that can build up the MC
3296 /// infrastructure of an MCInst given the Opcode and Format of the instr.
3297 /// Return NULL if it fails to create/return a proper builder. API clients
3298 /// are responsible for freeing up of the allocated memory. Cacheing can be
3299 /// performed by the API clients to improve performance.
3300 ARMBasicMCBuilder *llvm::CreateMCBuilder(unsigned Opcode, ARMFormat Format) {
3301 // For "Unknown format", fail by returning a NULL pointer.
3302 if ((unsigned)Format >= (array_lengthof(FuncPtrs) - 1)) {
3303 DEBUG(errs() << "Unknown format\n");
3307 return new ARMBasicMCBuilder(Opcode, Format,
3308 ARMInsts[Opcode].getNumOperands());