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 //#define DEBUG(X) do { X; } while (0)
25 /// ARMGenInstrInfo.inc - ARMGenInstrInfo.inc contains the static const
26 /// TargetInstrDesc ARMInsts[] definition and the TargetOperandInfo[]'s
27 /// describing the operand info for each ARMInsts[i].
29 /// Together with an instruction's encoding format, we can take advantage of the
30 /// NumOperands and the OpInfo fields of the target instruction description in
31 /// the quest to build out the MCOperand list for an MCInst.
33 /// The general guideline is that with a known format, the number of dst and src
34 /// operands are well-known. The dst is built first, followed by the src
35 /// operand(s). The operands not yet used at this point are for the Implicit
36 /// Uses and Defs by this instr. For the Uses part, the pred:$p operand is
37 /// defined with two components:
39 /// def pred { // Operand PredicateOperand
40 /// ValueType Type = OtherVT;
41 /// string PrintMethod = "printPredicateOperand";
42 /// string AsmOperandLowerMethod = ?;
43 /// dag MIOperandInfo = (ops i32imm, CCR);
44 /// AsmOperandClass ParserMatchClass = ImmAsmOperand;
45 /// dag DefaultOps = (ops (i32 14), (i32 zero_reg));
48 /// which is manifested by the TargetOperandInfo[] of:
50 /// { 0, 0|(1<<TOI::Predicate), 0 },
51 /// { ARM::CCRRegClassID, 0|(1<<TOI::Predicate), 0 }
53 /// So the first predicate MCOperand corresponds to the immediate part of the
54 /// ARM condition field (Inst{31-28}), and the second predicate MCOperand
55 /// corresponds to a register kind of ARM::CPSR.
57 /// For the Defs part, in the simple case of only cc_out:$s, we have:
59 /// def cc_out { // Operand OptionalDefOperand
60 /// ValueType Type = OtherVT;
61 /// string PrintMethod = "printSBitModifierOperand";
62 /// string AsmOperandLowerMethod = ?;
63 /// dag MIOperandInfo = (ops CCR);
64 /// AsmOperandClass ParserMatchClass = ImmAsmOperand;
65 /// dag DefaultOps = (ops (i32 zero_reg));
68 /// which is manifested by the one TargetOperandInfo of:
70 /// { ARM::CCRRegClassID, 0|(1<<TOI::OptionalDef), 0 }
72 /// And this maps to one MCOperand with the regsiter kind of ARM::CPSR.
73 #include "ARMGenInstrInfo.inc"
77 const char *ARMUtils::OpcodeName(unsigned Opcode) {
78 return ARMInsts[Opcode].Name;
81 // Return the register enum Based on RegClass and the raw register number.
84 getRegisterEnum(BO B, unsigned RegClassID, unsigned RawRegister) {
85 // For this purpose, we can treat rGPR as if it were GPR.
86 if (RegClassID == ARM::rGPRRegClassID) RegClassID = ARM::GPRRegClassID;
88 // See also decodeNEONRd(), decodeNEONRn(), decodeNEONRm().
90 RegClassID == ARM::QPRRegClassID ? RawRegister >> 1 : RawRegister;
97 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R0;
98 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
99 case ARM::DPR_VFP2RegClassID:
101 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
102 case ARM::QPR_VFP2RegClassID:
104 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S0;
108 switch (RegClassID) {
109 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R1;
110 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
111 case ARM::DPR_VFP2RegClassID:
113 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
114 case ARM::QPR_VFP2RegClassID:
116 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S1;
120 switch (RegClassID) {
121 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R2;
122 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
123 case ARM::DPR_VFP2RegClassID:
125 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
126 case ARM::QPR_VFP2RegClassID:
128 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S2;
132 switch (RegClassID) {
133 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R3;
134 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
135 case ARM::DPR_VFP2RegClassID:
137 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
138 case ARM::QPR_VFP2RegClassID:
140 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S3;
144 switch (RegClassID) {
145 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R4;
146 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
147 case ARM::DPR_VFP2RegClassID:
149 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q4;
150 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S4;
154 switch (RegClassID) {
155 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R5;
156 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
157 case ARM::DPR_VFP2RegClassID:
159 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q5;
160 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S5;
164 switch (RegClassID) {
165 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R6;
166 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
167 case ARM::DPR_VFP2RegClassID:
169 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q6;
170 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S6;
174 switch (RegClassID) {
175 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R7;
176 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
177 case ARM::DPR_VFP2RegClassID:
179 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q7;
180 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S7;
184 switch (RegClassID) {
185 case ARM::GPRRegClassID: return ARM::R8;
186 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D8;
187 case ARM::QPRRegClassID: return ARM::Q8;
188 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S8;
192 switch (RegClassID) {
193 case ARM::GPRRegClassID: return ARM::R9;
194 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D9;
195 case ARM::QPRRegClassID: return ARM::Q9;
196 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S9;
200 switch (RegClassID) {
201 case ARM::GPRRegClassID: return ARM::R10;
202 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D10;
203 case ARM::QPRRegClassID: return ARM::Q10;
204 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S10;
208 switch (RegClassID) {
209 case ARM::GPRRegClassID: return ARM::R11;
210 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D11;
211 case ARM::QPRRegClassID: return ARM::Q11;
212 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S11;
216 switch (RegClassID) {
217 case ARM::GPRRegClassID: return ARM::R12;
218 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D12;
219 case ARM::QPRRegClassID: return ARM::Q12;
220 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S12;
224 switch (RegClassID) {
225 case ARM::GPRRegClassID: return ARM::SP;
226 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D13;
227 case ARM::QPRRegClassID: return ARM::Q13;
228 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S13;
232 switch (RegClassID) {
233 case ARM::GPRRegClassID: return ARM::LR;
234 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D14;
235 case ARM::QPRRegClassID: return ARM::Q14;
236 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S14;
240 switch (RegClassID) {
241 case ARM::GPRRegClassID: return ARM::PC;
242 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D15;
243 case ARM::QPRRegClassID: return ARM::Q15;
244 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S15;
248 switch (RegClassID) {
249 case ARM::DPRRegClassID: return ARM::D16;
250 case ARM::SPRRegClassID: return ARM::S16;
254 switch (RegClassID) {
255 case ARM::DPRRegClassID: return ARM::D17;
256 case ARM::SPRRegClassID: return ARM::S17;
260 switch (RegClassID) {
261 case ARM::DPRRegClassID: return ARM::D18;
262 case ARM::SPRRegClassID: return ARM::S18;
266 switch (RegClassID) {
267 case ARM::DPRRegClassID: return ARM::D19;
268 case ARM::SPRRegClassID: return ARM::S19;
272 switch (RegClassID) {
273 case ARM::DPRRegClassID: return ARM::D20;
274 case ARM::SPRRegClassID: return ARM::S20;
278 switch (RegClassID) {
279 case ARM::DPRRegClassID: return ARM::D21;
280 case ARM::SPRRegClassID: return ARM::S21;
284 switch (RegClassID) {
285 case ARM::DPRRegClassID: return ARM::D22;
286 case ARM::SPRRegClassID: return ARM::S22;
290 switch (RegClassID) {
291 case ARM::DPRRegClassID: return ARM::D23;
292 case ARM::SPRRegClassID: return ARM::S23;
296 switch (RegClassID) {
297 case ARM::DPRRegClassID: return ARM::D24;
298 case ARM::SPRRegClassID: return ARM::S24;
302 switch (RegClassID) {
303 case ARM::DPRRegClassID: return ARM::D25;
304 case ARM::SPRRegClassID: return ARM::S25;
308 switch (RegClassID) {
309 case ARM::DPRRegClassID: return ARM::D26;
310 case ARM::SPRRegClassID: return ARM::S26;
314 switch (RegClassID) {
315 case ARM::DPRRegClassID: return ARM::D27;
316 case ARM::SPRRegClassID: return ARM::S27;
320 switch (RegClassID) {
321 case ARM::DPRRegClassID: return ARM::D28;
322 case ARM::SPRRegClassID: return ARM::S28;
326 switch (RegClassID) {
327 case ARM::DPRRegClassID: return ARM::D29;
328 case ARM::SPRRegClassID: return ARM::S29;
332 switch (RegClassID) {
333 case ARM::DPRRegClassID: return ARM::D30;
334 case ARM::SPRRegClassID: return ARM::S30;
338 switch (RegClassID) {
339 case ARM::DPRRegClassID: return ARM::D31;
340 case ARM::SPRRegClassID: return ARM::S31;
344 DEBUG(errs() << "Invalid (RegClassID, RawRegister) combination\n");
345 // Encoding error. Mark the builder with error code != 0.
350 ///////////////////////////////
352 // Utility Functions //
354 ///////////////////////////////
356 // Extract/Decode Rd: Inst{15-12}.
357 static inline unsigned decodeRd(uint32_t insn) {
358 return (insn >> ARMII::RegRdShift) & ARMII::GPRRegMask;
361 // Extract/Decode Rn: Inst{19-16}.
362 static inline unsigned decodeRn(uint32_t insn) {
363 return (insn >> ARMII::RegRnShift) & ARMII::GPRRegMask;
366 // Extract/Decode Rm: Inst{3-0}.
367 static inline unsigned decodeRm(uint32_t insn) {
368 return (insn & ARMII::GPRRegMask);
371 // Extract/Decode Rs: Inst{11-8}.
372 static inline unsigned decodeRs(uint32_t insn) {
373 return (insn >> ARMII::RegRsShift) & ARMII::GPRRegMask;
376 static inline unsigned getCondField(uint32_t insn) {
377 return (insn >> ARMII::CondShift);
380 static inline unsigned getIBit(uint32_t insn) {
381 return (insn >> ARMII::I_BitShift) & 1;
384 static inline unsigned getAM3IBit(uint32_t insn) {
385 return (insn >> ARMII::AM3_I_BitShift) & 1;
388 static inline unsigned getPBit(uint32_t insn) {
389 return (insn >> ARMII::P_BitShift) & 1;
392 static inline unsigned getUBit(uint32_t insn) {
393 return (insn >> ARMII::U_BitShift) & 1;
396 static inline unsigned getPUBits(uint32_t insn) {
397 return (insn >> ARMII::U_BitShift) & 3;
400 static inline unsigned getSBit(uint32_t insn) {
401 return (insn >> ARMII::S_BitShift) & 1;
404 static inline unsigned getWBit(uint32_t insn) {
405 return (insn >> ARMII::W_BitShift) & 1;
408 static inline unsigned getDBit(uint32_t insn) {
409 return (insn >> ARMII::D_BitShift) & 1;
412 static inline unsigned getNBit(uint32_t insn) {
413 return (insn >> ARMII::N_BitShift) & 1;
416 static inline unsigned getMBit(uint32_t insn) {
417 return (insn >> ARMII::M_BitShift) & 1;
420 // See A8.4 Shifts applied to a register.
421 // A8.4.2 Register controlled shifts.
423 // getShiftOpcForBits - getShiftOpcForBits translates from the ARM encoding bits
424 // into llvm enums for shift opcode. The API clients should pass in the value
425 // encoded with two bits, so the assert stays to signal a wrong API usage.
427 // A8-12: DecodeRegShift()
428 static inline ARM_AM::ShiftOpc getShiftOpcForBits(unsigned bits) {
430 default: assert(0 && "No such value"); return ARM_AM::no_shift;
431 case 0: return ARM_AM::lsl;
432 case 1: return ARM_AM::lsr;
433 case 2: return ARM_AM::asr;
434 case 3: return ARM_AM::ror;
438 // See A8.4 Shifts applied to a register.
439 // A8.4.1 Constant shifts.
441 // getImmShiftSE - getImmShiftSE translates from the raw ShiftOpc and raw Imm5
442 // encodings into the intended ShiftOpc and shift amount.
444 // A8-11: DecodeImmShift()
445 static inline void getImmShiftSE(ARM_AM::ShiftOpc &ShOp, unsigned &ShImm) {
449 case ARM_AM::no_shift:
453 ShOp = ARM_AM::no_shift;
465 // getAMSubModeForBits - getAMSubModeForBits translates from the ARM encoding
466 // bits Inst{24-23} (P(24) and U(23)) into llvm enums for AMSubMode. The API
467 // clients should pass in the value encoded with two bits, so the assert stays
468 // to signal a wrong API usage.
469 static inline ARM_AM::AMSubMode getAMSubModeForBits(unsigned bits) {
471 default: assert(0 && "No such value"); return ARM_AM::bad_am_submode;
472 case 1: return ARM_AM::ia; // P=0 U=1
473 case 3: return ARM_AM::ib; // P=1 U=1
474 case 0: return ARM_AM::da; // P=0 U=0
475 case 2: return ARM_AM::db; // P=1 U=0
479 ////////////////////////////////////////////
481 // Disassemble function definitions //
483 ////////////////////////////////////////////
485 /// There is a separate Disassemble*Frm function entry for disassembly of an ARM
486 /// instr into a list of MCOperands in the appropriate order, with possible dst,
487 /// followed by possible src(s).
489 /// The processing of the predicate, and the 'S' modifier bit, if MI modifies
490 /// the CPSR, is factored into ARMBasicMCBuilder's method named
491 /// TryPredicateAndSBitModifier.
493 static bool DisassemblePseudo(MCInst &MI, unsigned Opcode, uint32_t insn,
494 unsigned short NumOps, unsigned &NumOpsAdded, BO) {
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: ldstm_mode:$amode mode_imm
695 // RFEW/RFE: ldstm_mode:$amode 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 take a mask, followed by one GPR reg Rm. The mask contains the R Bit in
724 // bit 4, and the special register fields in bits 3-0.
725 if (Opcode == ARM::MSR) {
726 assert(NumOps >= 1 && OpInfo[1].RegClass == ARM::GPRRegClassID &&
727 "Reg operand expected");
728 MI.addOperand(MCOperand::CreateImm(slice(insn, 22, 22) << 4 /* R Bit */ |
729 slice(insn, 19, 16) /* Special Reg */ ));
730 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
735 // MSRi take a mask, followed by one so_imm operand. The mask contains the
736 // R Bit in bit 4, and the special register fields in bits 3-0.
737 if (Opcode == ARM::MSRi) {
738 MI.addOperand(MCOperand::CreateImm(slice(insn, 22, 22) << 4 /* R Bit */ |
739 slice(insn, 19, 16) /* Special Reg */ ));
740 // SOImm is 4-bit rotate amount in bits 11-8 with 8-bit imm in bits 7-0.
741 // A5.2.4 Rotate amount is twice the numeric value of Inst{11-8}.
742 // See also ARMAddressingModes.h: getSOImmValImm() and getSOImmValRot().
743 unsigned Rot = (insn >> ARMII::SoRotImmShift) & 0xF;
744 unsigned Imm = insn & 0xFF;
745 MI.addOperand(MCOperand::CreateImm(ARM_AM::rotr32(Imm, 2*Rot)));
749 if (Opcode == ARM::SRSW || Opcode == ARM::SRS ||
750 Opcode == ARM::RFEW || Opcode == ARM::RFE) {
751 ARM_AM::AMSubMode SubMode = getAMSubModeForBits(getPUBits(insn));
752 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM4ModeImm(SubMode)));
754 if (Opcode == ARM::SRSW || Opcode == ARM::SRS)
755 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0)));
757 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
763 assert((Opcode == ARM::Bcc || Opcode == ARM::BLr9 || Opcode == ARM::BLr9_pred
764 || Opcode == ARM::SMC || Opcode == ARM::SVC) &&
765 "Unexpected Opcode");
767 assert(NumOps >= 1 && OpInfo[0].RegClass < 0 && "Reg operand expected");
770 if (Opcode == ARM::SMC) {
771 // ZeroExtend(imm4, 32) where imm24 = Inst{3-0}.
772 Imm32 = slice(insn, 3, 0);
773 } else if (Opcode == ARM::SVC) {
774 // ZeroExtend(imm24, 32) where imm24 = Inst{23-0}.
775 Imm32 = slice(insn, 23, 0);
777 // SignExtend(imm24:'00', 32) where imm24 = Inst{23-0}.
778 unsigned Imm26 = slice(insn, 23, 0) << 2;
779 //Imm32 = signextend<signed int, 26>(Imm26);
780 Imm32 = SignExtend32<26>(Imm26);
782 // When executing an ARM instruction, PC reads as the address of the current
783 // instruction plus 8. The assembler subtracts 8 from the difference
784 // between the branch instruction and the target address, disassembler has
785 // to add 8 to compensate.
789 MI.addOperand(MCOperand::CreateImm(Imm32));
795 // Misc. Branch Instructions.
798 static bool DisassembleBrMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
799 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
801 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
802 if (!OpInfo) return false;
804 unsigned &OpIdx = NumOpsAdded;
808 // BX_RET and MOVPCLR have only two predicate operands; do an early return.
809 if (Opcode == ARM::BX_RET || Opcode == ARM::MOVPCLR)
812 // BLX and BX take one GPR reg.
813 if (Opcode == ARM::BLXr9 || Opcode == ARM::BLXr9_pred ||
814 Opcode == ARM::BLX || Opcode == ARM::BLX_pred ||
816 assert(NumOps >= 1 && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
817 "Reg operand expected");
818 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
827 static inline bool getBFCInvMask(uint32_t insn, uint32_t &mask) {
828 uint32_t lsb = slice(insn, 11, 7);
829 uint32_t msb = slice(insn, 20, 16);
832 DEBUG(errs() << "Encoding error: msb < lsb\n");
836 for (uint32_t i = lsb; i <= msb; ++i)
842 // A major complication is the fact that some of the saturating add/subtract
843 // operations have Rd Rm Rn, instead of the "normal" Rd Rn Rm.
844 // They are QADD, QDADD, QDSUB, and QSUB.
845 static bool DisassembleDPFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
846 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
848 const TargetInstrDesc &TID = ARMInsts[Opcode];
849 unsigned short NumDefs = TID.getNumDefs();
850 bool isUnary = isUnaryDP(TID.TSFlags);
851 const TargetOperandInfo *OpInfo = TID.OpInfo;
852 unsigned &OpIdx = NumOpsAdded;
856 // Disassemble register def if there is one.
857 if (NumDefs && (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID)) {
858 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
863 // Now disassemble the src operands.
867 // Special-case handling of BFC/BFI/SBFX/UBFX.
868 if (Opcode == ARM::BFC || Opcode == ARM::BFI) {
869 MI.addOperand(MCOperand::CreateReg(0));
870 if (Opcode == ARM::BFI) {
871 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
876 if (!getBFCInvMask(insn, mask))
879 MI.addOperand(MCOperand::CreateImm(mask));
883 if (Opcode == ARM::SBFX || Opcode == ARM::UBFX) {
884 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
886 MI.addOperand(MCOperand::CreateImm(slice(insn, 11, 7)));
887 MI.addOperand(MCOperand::CreateImm(slice(insn, 20, 16) + 1));
892 bool RmRn = (Opcode == ARM::QADD || Opcode == ARM::QDADD ||
893 Opcode == ARM::QDSUB || Opcode == ARM::QSUB);
895 // BinaryDP has an Rn operand.
897 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
898 "Reg operand expected");
899 MI.addOperand(MCOperand::CreateReg(
900 getRegisterEnum(B, ARM::GPRRegClassID,
901 RmRn ? decodeRm(insn) : decodeRn(insn))));
905 // If this is a two-address operand, skip it, e.g., MOVCCr operand 1.
906 if (isUnary && (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)) {
907 MI.addOperand(MCOperand::CreateReg(0));
911 // Now disassemble operand 2.
915 if (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) {
916 // We have a reg/reg form.
917 // Assert disabled because saturating operations, e.g., A8.6.127 QASX, are
918 // routed here as well.
919 // assert(getIBit(insn) == 0 && "I_Bit != '0' reg/reg form");
920 MI.addOperand(MCOperand::CreateReg(
921 getRegisterEnum(B, ARM::GPRRegClassID,
922 RmRn? decodeRn(insn) : decodeRm(insn))));
924 } else if (Opcode == ARM::MOVi16 || Opcode == ARM::MOVTi16) {
925 // We have an imm16 = imm4:imm12 (imm4=Inst{19:16}, imm12 = Inst{11:0}).
926 assert(getIBit(insn) == 1 && "I_Bit != '1' reg/imm form");
927 unsigned Imm16 = slice(insn, 19, 16) << 12 | slice(insn, 11, 0);
928 MI.addOperand(MCOperand::CreateImm(Imm16));
931 // We have a reg/imm form.
932 // SOImm is 4-bit rotate amount in bits 11-8 with 8-bit imm in bits 7-0.
933 // A5.2.4 Rotate amount is twice the numeric value of Inst{11-8}.
934 // See also ARMAddressingModes.h: getSOImmValImm() and getSOImmValRot().
935 assert(getIBit(insn) == 1 && "I_Bit != '1' reg/imm form");
936 unsigned Rot = (insn >> ARMII::SoRotImmShift) & 0xF;
937 unsigned Imm = insn & 0xFF;
938 MI.addOperand(MCOperand::CreateImm(ARM_AM::rotr32(Imm, 2*Rot)));
945 static bool DisassembleDPSoRegFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
946 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
948 const TargetInstrDesc &TID = ARMInsts[Opcode];
949 unsigned short NumDefs = TID.getNumDefs();
950 bool isUnary = isUnaryDP(TID.TSFlags);
951 const TargetOperandInfo *OpInfo = TID.OpInfo;
952 unsigned &OpIdx = NumOpsAdded;
956 // Disassemble register def if there is one.
957 if (NumDefs && (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID)) {
958 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
963 // Disassemble the src operands.
967 // BinaryDP has an Rn operand.
969 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
970 "Reg operand expected");
971 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
976 // If this is a two-address operand, skip it, e.g., MOVCCs operand 1.
977 if (isUnary && (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)) {
978 MI.addOperand(MCOperand::CreateReg(0));
982 // Disassemble operand 2, which consists of three components.
983 if (OpIdx + 2 >= NumOps)
986 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
987 (OpInfo[OpIdx+1].RegClass == ARM::GPRRegClassID) &&
988 (OpInfo[OpIdx+2].RegClass < 0) &&
989 "Expect 3 reg operands");
991 // Register-controlled shifts have Inst{7} = 0 and Inst{4} = 1.
992 unsigned Rs = slice(insn, 4, 4);
994 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
997 // Register-controlled shifts: [Rm, Rs, shift].
998 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1000 // Inst{6-5} encodes the shift opcode.
1001 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1002 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(ShOp, 0)));
1004 // Constant shifts: [Rm, reg0, shift_imm].
1005 MI.addOperand(MCOperand::CreateReg(0)); // NoRegister
1006 // Inst{6-5} encodes the shift opcode.
1007 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1008 // Inst{11-7} encodes the imm5 shift amount.
1009 unsigned ShImm = slice(insn, 11, 7);
1011 // A8.4.1. Possible rrx or shift amount of 32...
1012 getImmShiftSE(ShOp, ShImm);
1013 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(ShOp, ShImm)));
1020 static bool DisassembleLdStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1021 unsigned short NumOps, unsigned &NumOpsAdded, bool isStore, BO B) {
1023 const TargetInstrDesc &TID = ARMInsts[Opcode];
1024 bool isPrePost = isPrePostLdSt(TID.TSFlags);
1025 const TargetOperandInfo *OpInfo = TID.OpInfo;
1026 if (!OpInfo) return false;
1028 unsigned &OpIdx = NumOpsAdded;
1032 assert(((!isStore && TID.getNumDefs() > 0) ||
1033 (isStore && (TID.getNumDefs() == 0 || isPrePost)))
1034 && "Invalid arguments");
1036 // Operand 0 of a pre- and post-indexed store is the address base writeback.
1037 if (isPrePost && isStore) {
1038 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1039 "Reg operand expected");
1040 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1045 // Disassemble the dst/src operand.
1046 if (OpIdx >= NumOps)
1049 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1050 "Reg operand expected");
1051 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1055 // After dst of a pre- and post-indexed load is the address base writeback.
1056 if (isPrePost && !isStore) {
1057 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1058 "Reg operand expected");
1059 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1064 // Disassemble the base operand.
1065 if (OpIdx >= NumOps)
1068 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1069 "Reg operand expected");
1070 assert((!isPrePost || (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1))
1071 && "Index mode or tied_to operand expected");
1072 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1076 // For reg/reg form, base reg is followed by +/- reg shop imm.
1077 // For immediate form, it is followed by +/- imm12.
1078 // See also ARMAddressingModes.h (Addressing Mode #2).
1079 if (OpIdx + 1 >= NumOps)
1082 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
1083 (OpInfo[OpIdx+1].RegClass < 0) &&
1084 "Expect 1 reg operand followed by 1 imm operand");
1086 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1087 if (getIBit(insn) == 0) {
1088 MI.addOperand(MCOperand::CreateReg(0));
1090 // Disassemble the 12-bit immediate offset.
1091 unsigned Imm12 = slice(insn, 11, 0);
1092 unsigned Offset = ARM_AM::getAM2Opc(AddrOpcode, Imm12, ARM_AM::no_shift);
1093 MI.addOperand(MCOperand::CreateImm(Offset));
1095 // Disassemble the offset reg (Rm), shift type, and immediate shift length.
1096 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1098 // Inst{6-5} encodes the shift opcode.
1099 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1100 // Inst{11-7} encodes the imm5 shift amount.
1101 unsigned ShImm = slice(insn, 11, 7);
1103 // A8.4.1. Possible rrx or shift amount of 32...
1104 getImmShiftSE(ShOp, ShImm);
1105 MI.addOperand(MCOperand::CreateImm(
1106 ARM_AM::getAM2Opc(AddrOpcode, ShImm, ShOp)));
1113 static bool DisassembleLdFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1114 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1115 return DisassembleLdStFrm(MI, Opcode, insn, NumOps, NumOpsAdded, false, B);
1118 static bool DisassembleStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1119 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1120 return DisassembleLdStFrm(MI, Opcode, insn, NumOps, NumOpsAdded, true, B);
1123 static bool HasDualReg(unsigned Opcode) {
1127 case ARM::LDRD: case ARM::LDRD_PRE: case ARM::LDRD_POST:
1128 case ARM::STRD: case ARM::STRD_PRE: case ARM::STRD_POST:
1133 static bool DisassembleLdStMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1134 unsigned short NumOps, unsigned &NumOpsAdded, bool isStore, BO B) {
1136 const TargetInstrDesc &TID = ARMInsts[Opcode];
1137 bool isPrePost = isPrePostLdSt(TID.TSFlags);
1138 const TargetOperandInfo *OpInfo = TID.OpInfo;
1139 if (!OpInfo) return false;
1141 unsigned &OpIdx = NumOpsAdded;
1145 assert(((!isStore && TID.getNumDefs() > 0) ||
1146 (isStore && (TID.getNumDefs() == 0 || isPrePost)))
1147 && "Invalid arguments");
1149 // Operand 0 of a pre- and post-indexed store is the address base writeback.
1150 if (isPrePost && isStore) {
1151 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1152 "Reg operand expected");
1153 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1158 bool DualReg = HasDualReg(Opcode);
1160 // Disassemble the dst/src operand.
1161 if (OpIdx >= NumOps)
1164 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1165 "Reg operand expected");
1166 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1170 // Fill in LDRD and STRD's second operand.
1172 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1173 decodeRd(insn) + 1)));
1177 // After dst of a pre- and post-indexed load is the address base writeback.
1178 if (isPrePost && !isStore) {
1179 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1180 "Reg operand expected");
1181 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1186 // Disassemble the base operand.
1187 if (OpIdx >= NumOps)
1190 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1191 "Reg operand expected");
1192 assert((!isPrePost || (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1))
1193 && "Index mode or tied_to operand expected");
1194 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1198 // For reg/reg form, base reg is followed by +/- reg.
1199 // For immediate form, it is followed by +/- imm8.
1200 // See also ARMAddressingModes.h (Addressing Mode #3).
1201 if (OpIdx + 1 >= NumOps)
1204 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
1205 (OpInfo[OpIdx+1].RegClass < 0) &&
1206 "Expect 1 reg operand followed by 1 imm operand");
1208 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1209 if (getAM3IBit(insn) == 1) {
1210 MI.addOperand(MCOperand::CreateReg(0));
1212 // Disassemble the 8-bit immediate offset.
1213 unsigned Imm4H = (insn >> ARMII::ImmHiShift) & 0xF;
1214 unsigned Imm4L = insn & 0xF;
1215 unsigned Offset = ARM_AM::getAM3Opc(AddrOpcode, (Imm4H << 4) | Imm4L);
1216 MI.addOperand(MCOperand::CreateImm(Offset));
1218 // Disassemble the offset reg (Rm).
1219 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1221 unsigned Offset = ARM_AM::getAM3Opc(AddrOpcode, 0);
1222 MI.addOperand(MCOperand::CreateImm(Offset));
1229 static bool DisassembleLdMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1230 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1231 return DisassembleLdStMiscFrm(MI, Opcode, insn, NumOps, NumOpsAdded, false,
1235 static bool DisassembleStMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1236 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1237 return DisassembleLdStMiscFrm(MI, Opcode, insn, NumOps, NumOpsAdded, true, B);
1240 // The algorithm for disassembly of LdStMulFrm is different from others because
1241 // it explicitly populates the two predicate operands after operand 0 (the base)
1242 // and operand 1 (the AM4 mode imm). After operand 3, we need to populate the
1243 // reglist with each affected register encoded as an MCOperand.
1244 static bool DisassembleLdStMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1245 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1247 assert(NumOps >= 5 && "LdStMulFrm expects NumOps >= 5");
1250 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1252 // Writeback to base, if necessary.
1253 if (Opcode == ARM::LDMIA_UPD || Opcode == ARM::STMIA_UPD ||
1254 Opcode == ARM::LDMDA_UPD || Opcode == ARM::STMDA_UPD ||
1255 Opcode == ARM::LDMDB_UPD || Opcode == ARM::STMDB_UPD ||
1256 Opcode == ARM::LDMIB_UPD || Opcode == ARM::STMIB_UPD) {
1257 MI.addOperand(MCOperand::CreateReg(Base));
1261 // Add the base register operand.
1262 MI.addOperand(MCOperand::CreateReg(Base));
1264 // Handling the two predicate operands before the reglist.
1265 int64_t CondVal = insn >> ARMII::CondShift;
1266 MI.addOperand(MCOperand::CreateImm(CondVal == 0xF ? 0xE : CondVal));
1267 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
1271 // Fill the variadic part of reglist.
1272 unsigned RegListBits = insn & ((1 << 16) - 1);
1273 for (unsigned i = 0; i < 16; ++i) {
1274 if ((RegListBits >> i) & 1) {
1275 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1284 // LDREX, LDREXB, LDREXH: Rd Rn
1285 // LDREXD: Rd Rd+1 Rn
1286 // STREX, STREXB, STREXH: Rd Rm Rn
1287 // STREXD: Rd Rm Rm+1 Rn
1289 // SWP, SWPB: Rd Rm Rn
1290 static bool DisassembleLdStExFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1291 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1293 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1294 if (!OpInfo) return false;
1296 unsigned &OpIdx = NumOpsAdded;
1301 && OpInfo[0].RegClass == ARM::GPRRegClassID
1302 && OpInfo[1].RegClass == ARM::GPRRegClassID
1303 && "Expect 2 reg operands");
1305 bool isStore = slice(insn, 20, 20) == 0;
1306 bool isDW = (Opcode == ARM::LDREXD || Opcode == ARM::STREXD);
1308 // Add the destination operand.
1309 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1313 // Store register Exclusive needs a source operand.
1315 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1320 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1321 decodeRm(insn)+1)));
1325 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1326 decodeRd(insn)+1)));
1330 // Finally add the pointer operand.
1331 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1338 // Misc. Arithmetic Instructions.
1340 // PKHBT, PKHTB: Rd Rn Rm , LSL/ASR #imm5
1341 // RBIT, REV, REV16, REVSH: Rd Rm
1342 static bool DisassembleArithMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1343 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1345 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1346 unsigned &OpIdx = NumOpsAdded;
1351 && OpInfo[0].RegClass == ARM::GPRRegClassID
1352 && OpInfo[1].RegClass == ARM::GPRRegClassID
1353 && "Expect 2 reg operands");
1355 bool ThreeReg = NumOps > 2 && OpInfo[2].RegClass == ARM::GPRRegClassID;
1357 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1362 assert(NumOps >= 4 && "Expect >= 4 operands");
1363 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1368 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1372 // If there is still an operand info left which is an immediate operand, add
1373 // an additional imm5 LSL/ASR operand.
1374 if (ThreeReg && OpInfo[OpIdx].RegClass < 0
1375 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1376 // Extract the 5-bit immediate field Inst{11-7}.
1377 unsigned ShiftAmt = (insn >> ARMII::ShiftShift) & 0x1F;
1378 ARM_AM::ShiftOpc Opc = ARM_AM::no_shift;
1379 if (Opcode == ARM::PKHBT)
1381 else if (Opcode == ARM::PKHBT)
1383 getImmShiftSE(Opc, ShiftAmt);
1384 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(Opc, ShiftAmt)));
1391 /// DisassembleSatFrm - Disassemble saturate instructions:
1392 /// SSAT, SSAT16, USAT, and USAT16.
1393 static bool DisassembleSatFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1394 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1396 const TargetInstrDesc &TID = ARMInsts[Opcode];
1397 NumOpsAdded = TID.getNumOperands() - 2; // ignore predicate operands
1399 // Disassemble register def.
1400 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1403 unsigned Pos = slice(insn, 20, 16);
1404 if (Opcode == ARM::SSAT || Opcode == ARM::SSAT16)
1406 MI.addOperand(MCOperand::CreateImm(Pos));
1408 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1411 if (NumOpsAdded == 4) {
1412 ARM_AM::ShiftOpc Opc = (slice(insn, 6, 6) != 0 ? ARM_AM::asr : ARM_AM::lsl);
1413 // Inst{11-7} encodes the imm5 shift amount.
1414 unsigned ShAmt = slice(insn, 11, 7);
1416 // A8.6.183. Possible ASR shift amount of 32...
1417 if (Opc == ARM_AM::asr)
1420 Opc = ARM_AM::no_shift;
1422 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(Opc, ShAmt)));
1427 // Extend instructions.
1428 // SXT* and UXT*: Rd [Rn] Rm [rot_imm].
1429 // The 2nd operand register is Rn and the 3rd operand regsiter is Rm for the
1430 // three register operand form. Otherwise, Rn=0b1111 and only Rm is used.
1431 static bool DisassembleExtFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1432 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1434 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1435 unsigned &OpIdx = NumOpsAdded;
1440 && OpInfo[0].RegClass == ARM::GPRRegClassID
1441 && OpInfo[1].RegClass == ARM::GPRRegClassID
1442 && "Expect 2 reg operands");
1444 bool ThreeReg = NumOps > 2 && OpInfo[2].RegClass == ARM::GPRRegClassID;
1446 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1451 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1456 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1460 // If there is still an operand info left which is an immediate operand, add
1461 // an additional rotate immediate operand.
1462 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
1463 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1464 // Extract the 2-bit rotate field Inst{11-10}.
1465 unsigned rot = (insn >> ARMII::ExtRotImmShift) & 3;
1466 // Rotation by 8, 16, or 24 bits.
1467 MI.addOperand(MCOperand::CreateImm(rot << 3));
1474 /////////////////////////////////////
1476 // Utility Functions For VFP //
1478 /////////////////////////////////////
1480 // Extract/Decode Dd/Sd:
1482 // SP => d = UInt(Vd:D)
1483 // DP => d = UInt(D:Vd)
1484 static unsigned decodeVFPRd(uint32_t insn, bool isSPVFP) {
1485 return isSPVFP ? (decodeRd(insn) << 1 | getDBit(insn))
1486 : (decodeRd(insn) | getDBit(insn) << 4);
1489 // Extract/Decode Dn/Sn:
1491 // SP => n = UInt(Vn:N)
1492 // DP => n = UInt(N:Vn)
1493 static unsigned decodeVFPRn(uint32_t insn, bool isSPVFP) {
1494 return isSPVFP ? (decodeRn(insn) << 1 | getNBit(insn))
1495 : (decodeRn(insn) | getNBit(insn) << 4);
1498 // Extract/Decode Dm/Sm:
1500 // SP => m = UInt(Vm:M)
1501 // DP => m = UInt(M:Vm)
1502 static unsigned decodeVFPRm(uint32_t insn, bool isSPVFP) {
1503 return isSPVFP ? (decodeRm(insn) << 1 | getMBit(insn))
1504 : (decodeRm(insn) | getMBit(insn) << 4);
1508 static APInt VFPExpandImm(unsigned char byte, unsigned N) {
1509 assert(N == 32 || N == 64);
1512 unsigned bit6 = slice(byte, 6, 6);
1514 Result = slice(byte, 7, 7) << 31 | slice(byte, 5, 0) << 19;
1516 Result |= 0x1f << 25;
1518 Result |= 0x1 << 30;
1520 Result = (uint64_t)slice(byte, 7, 7) << 63 |
1521 (uint64_t)slice(byte, 5, 0) << 48;
1523 Result |= 0xffULL << 54;
1525 Result |= 0x1ULL << 62;
1527 return APInt(N, Result);
1530 // VFP Unary Format Instructions:
1532 // VCMP[E]ZD, VCMP[E]ZS: compares one floating-point register with zero
1533 // VCVTDS, VCVTSD: converts between double-precision and single-precision
1534 // The rest of the instructions have homogeneous [VFP]Rd and [VFP]Rm registers.
1535 static bool DisassembleVFPUnaryFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1536 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1538 assert(NumOps >= 1 && "VFPUnaryFrm expects NumOps >= 1");
1540 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1541 unsigned &OpIdx = NumOpsAdded;
1545 unsigned RegClass = OpInfo[OpIdx].RegClass;
1546 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1547 "Reg operand expected");
1548 bool isSP = (RegClass == ARM::SPRRegClassID);
1550 MI.addOperand(MCOperand::CreateReg(
1551 getRegisterEnum(B, RegClass, decodeVFPRd(insn, isSP))));
1554 // Early return for compare with zero instructions.
1555 if (Opcode == ARM::VCMPEZD || Opcode == ARM::VCMPEZS
1556 || Opcode == ARM::VCMPZD || Opcode == ARM::VCMPZS)
1559 RegClass = OpInfo[OpIdx].RegClass;
1560 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1561 "Reg operand expected");
1562 isSP = (RegClass == ARM::SPRRegClassID);
1564 MI.addOperand(MCOperand::CreateReg(
1565 getRegisterEnum(B, RegClass, decodeVFPRm(insn, isSP))));
1571 // All the instructions have homogeneous [VFP]Rd, [VFP]Rn, and [VFP]Rm regs.
1572 // Some of them have operand constraints which tie the first operand in the
1573 // InOperandList to that of the dst. As far as asm printing is concerned, this
1574 // tied_to operand is simply skipped.
1575 static bool DisassembleVFPBinaryFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1576 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1578 assert(NumOps >= 3 && "VFPBinaryFrm expects NumOps >= 3");
1580 const TargetInstrDesc &TID = ARMInsts[Opcode];
1581 const TargetOperandInfo *OpInfo = TID.OpInfo;
1582 unsigned &OpIdx = NumOpsAdded;
1586 unsigned RegClass = OpInfo[OpIdx].RegClass;
1587 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1588 "Reg operand expected");
1589 bool isSP = (RegClass == ARM::SPRRegClassID);
1591 MI.addOperand(MCOperand::CreateReg(
1592 getRegisterEnum(B, RegClass, decodeVFPRd(insn, isSP))));
1595 // Skip tied_to operand constraint.
1596 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
1597 assert(NumOps >= 4 && "Expect >=4 operands");
1598 MI.addOperand(MCOperand::CreateReg(0));
1602 MI.addOperand(MCOperand::CreateReg(
1603 getRegisterEnum(B, RegClass, decodeVFPRn(insn, isSP))));
1606 MI.addOperand(MCOperand::CreateReg(
1607 getRegisterEnum(B, RegClass, decodeVFPRm(insn, isSP))));
1613 // A8.6.295 vcvt (floating-point <-> integer)
1614 // Int to FP: VSITOD, VSITOS, VUITOD, VUITOS
1615 // FP to Int: VTOSI[Z|R]D, VTOSI[Z|R]S, VTOUI[Z|R]D, VTOUI[Z|R]S
1617 // A8.6.297 vcvt (floating-point and fixed-point)
1618 // Dd|Sd Dd|Sd(TIED_TO) #fbits(= 16|32 - UInt(imm4:i))
1619 static bool DisassembleVFPConv1Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1620 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1622 assert(NumOps >= 2 && "VFPConv1Frm expects NumOps >= 2");
1624 const TargetInstrDesc &TID = ARMInsts[Opcode];
1625 const TargetOperandInfo *OpInfo = TID.OpInfo;
1626 if (!OpInfo) return false;
1628 bool SP = slice(insn, 8, 8) == 0; // A8.6.295 & A8.6.297
1629 bool fixed_point = slice(insn, 17, 17) == 1; // A8.6.297
1630 unsigned RegClassID = SP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1634 assert(NumOps >= 3 && "Expect >= 3 operands");
1635 int size = slice(insn, 7, 7) == 0 ? 16 : 32;
1636 int fbits = size - (slice(insn,3,0) << 1 | slice(insn,5,5));
1637 MI.addOperand(MCOperand::CreateReg(
1638 getRegisterEnum(B, RegClassID,
1639 decodeVFPRd(insn, SP))));
1641 assert(TID.getOperandConstraint(1, TOI::TIED_TO) != -1 &&
1642 "Tied to operand expected");
1643 MI.addOperand(MI.getOperand(0));
1645 assert(OpInfo[2].RegClass < 0 && !OpInfo[2].isPredicate() &&
1646 !OpInfo[2].isOptionalDef() && "Imm operand expected");
1647 MI.addOperand(MCOperand::CreateImm(fbits));
1652 // The Rd (destination) and Rm (source) bits have different interpretations
1653 // depending on their single-precisonness.
1655 if (slice(insn, 18, 18) == 1) { // to_integer operation
1656 d = decodeVFPRd(insn, true /* Is Single Precision */);
1657 MI.addOperand(MCOperand::CreateReg(
1658 getRegisterEnum(B, ARM::SPRRegClassID, d)));
1659 m = decodeVFPRm(insn, SP);
1660 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, m)));
1662 d = decodeVFPRd(insn, SP);
1663 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, d)));
1664 m = decodeVFPRm(insn, true /* Is Single Precision */);
1665 MI.addOperand(MCOperand::CreateReg(
1666 getRegisterEnum(B, ARM::SPRRegClassID, m)));
1674 // VMOVRS - A8.6.330
1675 // Rt => Rd; Sn => UInt(Vn:N)
1676 static bool DisassembleVFPConv2Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1677 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1679 assert(NumOps >= 2 && "VFPConv2Frm expects NumOps >= 2");
1681 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1683 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1684 decodeVFPRn(insn, true))));
1689 // VMOVRRD - A8.6.332
1690 // Rt => Rd; Rt2 => Rn; Dm => UInt(M:Vm)
1692 // VMOVRRS - A8.6.331
1693 // Rt => Rd; Rt2 => Rn; Sm => UInt(Vm:M); Sm1 = Sm+1
1694 static bool DisassembleVFPConv3Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1695 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1697 assert(NumOps >= 3 && "VFPConv3Frm expects NumOps >= 3");
1699 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1700 unsigned &OpIdx = NumOpsAdded;
1702 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1704 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1708 if (OpInfo[OpIdx].RegClass == ARM::SPRRegClassID) {
1709 unsigned Sm = decodeVFPRm(insn, true);
1710 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1712 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1716 MI.addOperand(MCOperand::CreateReg(
1717 getRegisterEnum(B, ARM::DPRRegClassID,
1718 decodeVFPRm(insn, false))));
1724 // VMOVSR - A8.6.330
1725 // Rt => Rd; Sn => UInt(Vn:N)
1726 static bool DisassembleVFPConv4Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1727 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1729 assert(NumOps >= 2 && "VFPConv4Frm expects NumOps >= 2");
1731 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1732 decodeVFPRn(insn, true))));
1733 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1739 // VMOVDRR - A8.6.332
1740 // Rt => Rd; Rt2 => Rn; Dm => UInt(M:Vm)
1742 // VMOVRRS - A8.6.331
1743 // Rt => Rd; Rt2 => Rn; Sm => UInt(Vm:M); Sm1 = Sm+1
1744 static bool DisassembleVFPConv5Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1745 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1747 assert(NumOps >= 3 && "VFPConv5Frm expects NumOps >= 3");
1749 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1750 unsigned &OpIdx = NumOpsAdded;
1754 if (OpInfo[OpIdx].RegClass == ARM::SPRRegClassID) {
1755 unsigned Sm = decodeVFPRm(insn, true);
1756 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1758 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1762 MI.addOperand(MCOperand::CreateReg(
1763 getRegisterEnum(B, ARM::DPRRegClassID,
1764 decodeVFPRm(insn, false))));
1768 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1770 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1776 // VFP Load/Store Instructions.
1777 // VLDRD, VLDRS, VSTRD, VSTRS
1778 static bool DisassembleVFPLdStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1779 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1781 assert(NumOps >= 3 && "VFPLdStFrm expects NumOps >= 3");
1783 bool isSPVFP = (Opcode == ARM::VLDRS || Opcode == ARM::VSTRS);
1784 unsigned RegClassID = isSPVFP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1786 // Extract Dd/Sd for operand 0.
1787 unsigned RegD = decodeVFPRd(insn, isSPVFP);
1789 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, RegD)));
1791 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1792 MI.addOperand(MCOperand::CreateReg(Base));
1794 // Next comes the AM5 Opcode.
1795 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1796 unsigned char Imm8 = insn & 0xFF;
1797 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(AddrOpcode, Imm8)));
1804 // VFP Load/Store Multiple Instructions.
1805 // This is similar to the algorithm for LDM/STM in that operand 0 (the base) and
1806 // operand 1 (the AM4 mode imm) is followed by two predicate operands. It is
1807 // followed by a reglist of either DPR(s) or SPR(s).
1809 // VLDMD[_UPD], VLDMS[_UPD], VSTMD[_UPD], VSTMS[_UPD]
1810 static bool DisassembleVFPLdStMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1811 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1813 assert(NumOps >= 5 && "VFPLdStMulFrm expects NumOps >= 5");
1815 unsigned &OpIdx = NumOpsAdded;
1819 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1821 // Writeback to base, if necessary.
1822 if (Opcode == ARM::VLDMDIA_UPD || Opcode == ARM::VLDMSIA_UPD ||
1823 Opcode == ARM::VLDMDDB_UPD || Opcode == ARM::VLDMSDB_UPD ||
1824 Opcode == ARM::VSTMDIA_UPD || Opcode == ARM::VSTMSIA_UPD ||
1825 Opcode == ARM::VSTMDDB_UPD || Opcode == ARM::VSTMSDB_UPD) {
1826 MI.addOperand(MCOperand::CreateReg(Base));
1830 MI.addOperand(MCOperand::CreateReg(Base));
1832 // Next comes the AM4 Opcode.
1833 ARM_AM::AMSubMode SubMode = getAMSubModeForBits(getPUBits(insn));
1834 // Must be either "ia" or "db" submode.
1835 if (SubMode != ARM_AM::ia && SubMode != ARM_AM::db) {
1836 DEBUG(errs() << "Illegal addressing mode 4 sub-mode!\n");
1839 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM4ModeImm(SubMode)));
1841 // Handling the two predicate operands before the reglist.
1842 int64_t CondVal = insn >> ARMII::CondShift;
1843 MI.addOperand(MCOperand::CreateImm(CondVal == 0xF ? 0xE : CondVal));
1844 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
1848 bool isSPVFP = (Opcode == ARM::VLDMSIA || Opcode == ARM::VLDMSDB ||
1849 Opcode == ARM::VLDMSIA_UPD || Opcode == ARM::VLDMSDB_UPD ||
1850 Opcode == ARM::VSTMSIA || Opcode == ARM::VSTMSDB ||
1851 Opcode == ARM::VSTMSIA_UPD || Opcode == ARM::VSTMSDB_UPD);
1852 unsigned RegClassID = isSPVFP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1855 unsigned RegD = decodeVFPRd(insn, isSPVFP);
1857 // Fill the variadic part of reglist.
1858 unsigned char Imm8 = insn & 0xFF;
1859 unsigned Regs = isSPVFP ? Imm8 : Imm8/2;
1860 for (unsigned i = 0; i < Regs; ++i) {
1861 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID,
1869 // Misc. VFP Instructions.
1870 // FMSTAT (vmrs with Rt=0b1111, i.e., to apsr_nzcv and no register operand)
1871 // FCONSTD (DPR and a VFPf64Imm operand)
1872 // FCONSTS (SPR and a VFPf32Imm operand)
1873 // VMRS/VMSR (GPR operand)
1874 static bool DisassembleVFPMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1875 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1877 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1878 unsigned &OpIdx = NumOpsAdded;
1882 if (Opcode == ARM::FMSTAT)
1885 assert(NumOps >= 2 && "VFPMiscFrm expects >=2 operands");
1887 unsigned RegEnum = 0;
1888 switch (OpInfo[0].RegClass) {
1889 case ARM::DPRRegClassID:
1890 RegEnum = getRegisterEnum(B, ARM::DPRRegClassID, decodeVFPRd(insn, false));
1892 case ARM::SPRRegClassID:
1893 RegEnum = getRegisterEnum(B, ARM::SPRRegClassID, decodeVFPRd(insn, true));
1895 case ARM::GPRRegClassID:
1896 RegEnum = getRegisterEnum(B, ARM::GPRRegClassID, decodeRd(insn));
1899 assert(0 && "Invalid reg class id");
1903 MI.addOperand(MCOperand::CreateReg(RegEnum));
1906 // Extract/decode the f64/f32 immediate.
1907 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
1908 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1909 // The asm syntax specifies the floating point value, not the 8-bit literal.
1910 APInt immRaw = VFPExpandImm(slice(insn,19,16) << 4 | slice(insn, 3, 0),
1911 Opcode == ARM::FCONSTD ? 64 : 32);
1912 APFloat immFP = APFloat(immRaw, true);
1913 double imm = Opcode == ARM::FCONSTD ? immFP.convertToDouble() :
1914 immFP.convertToFloat();
1915 MI.addOperand(MCOperand::CreateFPImm(imm));
1923 // DisassembleThumbFrm() is defined in ThumbDisassemblerCore.h file.
1924 #include "ThumbDisassemblerCore.h"
1926 /////////////////////////////////////////////////////
1928 // Utility Functions For ARM Advanced SIMD //
1930 /////////////////////////////////////////////////////
1932 // The following NEON namings are based on A8.6.266 VABA, VABAL. Notice that
1933 // A8.6.303 VDUP (ARM core register)'s D/Vd pair is the N/Vn pair of VABA/VABAL.
1935 // A7.3 Register encoding
1937 // Extract/Decode NEON D/Vd:
1939 // Note that for quadword, Qd = UInt(D:Vd<3:1>) = Inst{22:15-13}, whereas for
1940 // doubleword, Dd = UInt(D:Vd). We compensate for this difference by
1941 // handling it in the getRegisterEnum() utility function.
1942 // D = Inst{22}, Vd = Inst{15-12}
1943 static unsigned decodeNEONRd(uint32_t insn) {
1944 return ((insn >> ARMII::NEON_D_BitShift) & 1) << 4
1945 | ((insn >> ARMII::NEON_RegRdShift) & ARMII::NEONRegMask);
1948 // Extract/Decode NEON N/Vn:
1950 // Note that for quadword, Qn = UInt(N:Vn<3:1>) = Inst{7:19-17}, whereas for
1951 // doubleword, Dn = UInt(N:Vn). We compensate for this difference by
1952 // handling it in the getRegisterEnum() utility function.
1953 // N = Inst{7}, Vn = Inst{19-16}
1954 static unsigned decodeNEONRn(uint32_t insn) {
1955 return ((insn >> ARMII::NEON_N_BitShift) & 1) << 4
1956 | ((insn >> ARMII::NEON_RegRnShift) & ARMII::NEONRegMask);
1959 // Extract/Decode NEON M/Vm:
1961 // Note that for quadword, Qm = UInt(M:Vm<3:1>) = Inst{5:3-1}, whereas for
1962 // doubleword, Dm = UInt(M:Vm). We compensate for this difference by
1963 // handling it in the getRegisterEnum() utility function.
1964 // M = Inst{5}, Vm = Inst{3-0}
1965 static unsigned decodeNEONRm(uint32_t insn) {
1966 return ((insn >> ARMII::NEON_M_BitShift) & 1) << 4
1967 | ((insn >> ARMII::NEON_RegRmShift) & ARMII::NEONRegMask);
1978 } // End of unnamed namespace
1980 // size field -> Inst{11-10}
1981 // index_align field -> Inst{7-4}
1983 // The Lane Index interpretation depends on the Data Size:
1984 // 8 (encoded as size = 0b00) -> Index = index_align[3:1]
1985 // 16 (encoded as size = 0b01) -> Index = index_align[3:2]
1986 // 32 (encoded as size = 0b10) -> Index = index_align[3]
1988 // Ref: A8.6.317 VLD4 (single 4-element structure to one lane).
1989 static unsigned decodeLaneIndex(uint32_t insn) {
1990 unsigned size = insn >> 10 & 3;
1991 assert((size == 0 || size == 1 || size == 2) &&
1992 "Encoding error: size should be either 0, 1, or 2");
1994 unsigned index_align = insn >> 4 & 0xF;
1995 return (index_align >> 1) >> size;
1998 // imm64 = AdvSIMDExpandImm(op, cmode, i:imm3:imm4)
1999 // op = Inst{5}, cmode = Inst{11-8}
2000 // i = Inst{24} (ARM architecture)
2001 // imm3 = Inst{18-16}, imm4 = Inst{3-0}
2002 // Ref: Table A7-15 Modified immediate values for Advanced SIMD instructions.
2003 static uint64_t decodeN1VImm(uint32_t insn, ElemSize esize) {
2004 unsigned char op = (insn >> 5) & 1;
2005 unsigned char cmode = (insn >> 8) & 0xF;
2006 unsigned char Imm8 = ((insn >> 24) & 1) << 7 |
2007 ((insn >> 16) & 7) << 4 |
2009 return (op << 12) | (cmode << 8) | Imm8;
2012 // A8.6.339 VMUL, VMULL (by scalar)
2013 // ESize16 => m = Inst{2-0} (Vm<2:0>) D0-D7
2014 // ESize32 => m = Inst{3-0} (Vm<3:0>) D0-D15
2015 static unsigned decodeRestrictedDm(uint32_t insn, ElemSize esize) {
2022 assert(0 && "Unreachable code!");
2027 // A8.6.339 VMUL, VMULL (by scalar)
2028 // ESize16 => index = Inst{5:3} (M:Vm<3>) D0-D7
2029 // ESize32 => index = Inst{5} (M) D0-D15
2030 static unsigned decodeRestrictedDmIndex(uint32_t insn, ElemSize esize) {
2033 return (((insn >> 5) & 1) << 1) | ((insn >> 3) & 1);
2035 return (insn >> 5) & 1;
2037 assert(0 && "Unreachable code!");
2042 // A8.6.296 VCVT (between floating-point and fixed-point, Advanced SIMD)
2043 // (64 - <fbits>) is encoded as imm6, i.e., Inst{21-16}.
2044 static unsigned decodeVCVTFractionBits(uint32_t insn) {
2045 return 64 - ((insn >> 16) & 0x3F);
2048 // A8.6.302 VDUP (scalar)
2049 // ESize8 => index = Inst{19-17}
2050 // ESize16 => index = Inst{19-18}
2051 // ESize32 => index = Inst{19}
2052 static unsigned decodeNVLaneDupIndex(uint32_t insn, ElemSize esize) {
2055 return (insn >> 17) & 7;
2057 return (insn >> 18) & 3;
2059 return (insn >> 19) & 1;
2061 assert(0 && "Unspecified element size!");
2066 // A8.6.328 VMOV (ARM core register to scalar)
2067 // A8.6.329 VMOV (scalar to ARM core register)
2068 // ESize8 => index = Inst{21:6-5}
2069 // ESize16 => index = Inst{21:6}
2070 // ESize32 => index = Inst{21}
2071 static unsigned decodeNVLaneOpIndex(uint32_t insn, ElemSize esize) {
2074 return ((insn >> 21) & 1) << 2 | ((insn >> 5) & 3);
2076 return ((insn >> 21) & 1) << 1 | ((insn >> 6) & 1);
2078 return ((insn >> 21) & 1);
2080 assert(0 && "Unspecified element size!");
2085 // Imm6 = Inst{21-16}, L = Inst{7}
2087 // LeftShift == true (A8.6.367 VQSHL, A8.6.387 VSLI):
2089 // '0001xxx' => esize = 8; shift_amount = imm6 - 8
2090 // '001xxxx' => esize = 16; shift_amount = imm6 - 16
2091 // '01xxxxx' => esize = 32; shift_amount = imm6 - 32
2092 // '1xxxxxx' => esize = 64; shift_amount = imm6
2094 // LeftShift == false (A8.6.376 VRSHR, A8.6.368 VQSHRN):
2096 // '0001xxx' => esize = 8; shift_amount = 16 - imm6
2097 // '001xxxx' => esize = 16; shift_amount = 32 - imm6
2098 // '01xxxxx' => esize = 32; shift_amount = 64 - imm6
2099 // '1xxxxxx' => esize = 64; shift_amount = 64 - imm6
2101 static unsigned decodeNVSAmt(uint32_t insn, bool LeftShift) {
2102 ElemSize esize = ESizeNA;
2103 unsigned L = (insn >> 7) & 1;
2104 unsigned imm6 = (insn >> 16) & 0x3F;
2108 else if (imm6 >> 4 == 1)
2110 else if (imm6 >> 5 == 1)
2113 assert(0 && "Wrong encoding of Inst{7:21-16}!");
2118 return esize == ESize64 ? imm6 : (imm6 - esize);
2120 return esize == ESize64 ? (esize - imm6) : (2*esize - imm6);
2124 // Imm4 = Inst{11-8}
2125 static unsigned decodeN3VImm(uint32_t insn) {
2126 return (insn >> 8) & 0xF;
2130 // D[d] D[d2] ... Rn [TIED_TO Rn] align [Rm]
2132 // D[d] D[d2] ... Rn [TIED_TO Rn] align [Rm] TIED_TO ... imm(idx)
2134 // Rn [TIED_TO Rn] align [Rm] D[d] D[d2] ...
2136 // Rn [TIED_TO Rn] align [Rm] D[d] D[d2] ... [imm(idx)]
2138 // Correctly set VLD*/VST*'s TIED_TO GPR, as the asm printer needs it.
2139 static bool DisassembleNLdSt0(MCInst &MI, unsigned Opcode, uint32_t insn,
2140 unsigned short NumOps, unsigned &NumOpsAdded, bool Store, bool DblSpaced,
2143 const TargetInstrDesc &TID = ARMInsts[Opcode];
2144 const TargetOperandInfo *OpInfo = TID.OpInfo;
2146 // At least one DPR register plus addressing mode #6.
2147 assert(NumOps >= 3 && "Expect >= 3 operands");
2149 unsigned &OpIdx = NumOpsAdded;
2153 // We have homogeneous NEON registers for Load/Store.
2154 unsigned RegClass = 0;
2156 // Double-spaced registers have increments of 2.
2157 unsigned Inc = DblSpaced ? 2 : 1;
2159 unsigned Rn = decodeRn(insn);
2160 unsigned Rm = decodeRm(insn);
2161 unsigned Rd = decodeNEONRd(insn);
2163 // A7.7.1 Advanced SIMD addressing mode.
2166 // LLVM Addressing Mode #6.
2167 unsigned RmEnum = 0;
2169 RmEnum = getRegisterEnum(B, ARM::GPRRegClassID, Rm);
2172 // Consume possible WB, AddrMode6, possible increment reg, the DPR/QPR's,
2173 // then possible lane index.
2174 assert(OpIdx < NumOps && OpInfo[0].RegClass == ARM::GPRRegClassID &&
2175 "Reg operand expected");
2178 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2183 assert((OpIdx+1) < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
2184 OpInfo[OpIdx + 1].RegClass < 0 && "Addrmode #6 Operands expected");
2185 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2187 MI.addOperand(MCOperand::CreateImm(0)); // Alignment ignored?
2191 MI.addOperand(MCOperand::CreateReg(RmEnum));
2195 assert(OpIdx < NumOps &&
2196 (OpInfo[OpIdx].RegClass == ARM::DPRRegClassID ||
2197 OpInfo[OpIdx].RegClass == ARM::QPRRegClassID) &&
2198 "Reg operand expected");
2200 RegClass = OpInfo[OpIdx].RegClass;
2201 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2202 MI.addOperand(MCOperand::CreateReg(
2203 getRegisterEnum(B, RegClass, Rd)));
2208 // Handle possible lane index.
2209 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2210 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2211 MI.addOperand(MCOperand::CreateImm(decodeLaneIndex(insn)));
2216 // Consume the DPR/QPR's, possible WB, AddrMode6, possible incrment reg,
2217 // possible TIED_TO DPR/QPR's (ignored), then possible lane index.
2218 RegClass = OpInfo[0].RegClass;
2220 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2221 MI.addOperand(MCOperand::CreateReg(
2222 getRegisterEnum(B, RegClass, Rd)));
2228 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2233 assert((OpIdx+1) < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
2234 OpInfo[OpIdx + 1].RegClass < 0 && "Addrmode #6 Operands expected");
2235 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2237 MI.addOperand(MCOperand::CreateImm(0)); // Alignment ignored?
2241 MI.addOperand(MCOperand::CreateReg(RmEnum));
2245 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2246 assert(TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1 &&
2247 "Tied to operand expected");
2248 MI.addOperand(MCOperand::CreateReg(0));
2252 // Handle possible lane index.
2253 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2254 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2255 MI.addOperand(MCOperand::CreateImm(decodeLaneIndex(insn)));
2260 // Accessing registers past the end of the NEON register file is not
2269 // If L (Inst{21}) == 0, store instructions.
2270 // Find out about double-spaced-ness of the Opcode and pass it on to
2271 // DisassembleNLdSt0().
2272 static bool DisassembleNLdSt(MCInst &MI, unsigned Opcode, uint32_t insn,
2273 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2275 const StringRef Name = ARMInsts[Opcode].Name;
2276 bool DblSpaced = false;
2278 if (Name.find("LN") != std::string::npos) {
2279 // To one lane instructions.
2280 // See, for example, 8.6.317 VLD4 (single 4-element structure to one lane).
2282 // <size> == 16 && Inst{5} == 1 --> DblSpaced = true
2283 if (Name.endswith("16") || Name.endswith("16_UPD"))
2284 DblSpaced = slice(insn, 5, 5) == 1;
2286 // <size> == 32 && Inst{6} == 1 --> DblSpaced = true
2287 if (Name.endswith("32") || Name.endswith("32_UPD"))
2288 DblSpaced = slice(insn, 6, 6) == 1;
2291 // Multiple n-element structures with type encoded as Inst{11-8}.
2292 // See, for example, A8.6.316 VLD4 (multiple 4-element structures).
2294 // n == 2 && type == 0b1001 -> DblSpaced = true
2295 if (Name.startswith("VST2") || Name.startswith("VLD2"))
2296 DblSpaced = slice(insn, 11, 8) == 9;
2298 // n == 3 && type == 0b0101 -> DblSpaced = true
2299 if (Name.startswith("VST3") || Name.startswith("VLD3"))
2300 DblSpaced = slice(insn, 11, 8) == 5;
2302 // n == 4 && type == 0b0001 -> DblSpaced = true
2303 if (Name.startswith("VST4") || Name.startswith("VLD4"))
2304 DblSpaced = slice(insn, 11, 8) == 1;
2307 return DisassembleNLdSt0(MI, Opcode, insn, NumOps, NumOpsAdded,
2308 slice(insn, 21, 21) == 0, DblSpaced, B);
2313 static bool DisassembleN1RegModImmFrm(MCInst &MI, unsigned Opcode,
2314 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2316 const TargetInstrDesc &TID = ARMInsts[Opcode];
2317 const TargetOperandInfo *OpInfo = TID.OpInfo;
2319 assert(NumOps >= 2 &&
2320 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2321 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2322 (OpInfo[1].RegClass < 0) &&
2323 "Expect 1 reg operand followed by 1 imm operand");
2325 // Qd/Dd = Inst{22:15-12} => NEON Rd
2326 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[0].RegClass,
2327 decodeNEONRd(insn))));
2329 ElemSize esize = ESizeNA;
2332 case ARM::VMOVv16i8:
2335 case ARM::VMOVv4i16:
2336 case ARM::VMOVv8i16:
2337 case ARM::VMVNv4i16:
2338 case ARM::VMVNv8i16:
2341 case ARM::VMOVv2i32:
2342 case ARM::VMOVv4i32:
2343 case ARM::VMVNv2i32:
2344 case ARM::VMVNv4i32:
2347 case ARM::VMOVv1i64:
2348 case ARM::VMOVv2i64:
2352 assert(0 && "Unreachable code!");
2356 // One register and a modified immediate value.
2357 // Add the imm operand.
2358 MI.addOperand(MCOperand::CreateImm(decodeN1VImm(insn, esize)));
2368 N2V_VectorConvert_Between_Float_Fixed
2370 } // End of unnamed namespace
2372 // Vector Convert [between floating-point and fixed-point]
2373 // Qd/Dd Qm/Dm [fbits]
2375 // Vector Duplicate Lane (from scalar to all elements) Instructions.
2376 // VDUPLN16d, VDUPLN16q, VDUPLN32d, VDUPLN32q, VDUPLN8d, VDUPLN8q:
2379 // Vector Move Long:
2382 // Vector Move Narrow:
2386 static bool DisassembleNVdVmOptImm(MCInst &MI, unsigned Opc, uint32_t insn,
2387 unsigned short NumOps, unsigned &NumOpsAdded, N2VFlag Flag, BO B) {
2389 const TargetInstrDesc &TID = ARMInsts[Opc];
2390 const TargetOperandInfo *OpInfo = TID.OpInfo;
2392 assert(NumOps >= 2 &&
2393 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2394 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2395 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2396 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2397 "Expect >= 2 operands and first 2 as reg operands");
2399 unsigned &OpIdx = NumOpsAdded;
2403 ElemSize esize = ESizeNA;
2404 if (Flag == N2V_VectorDupLane) {
2405 // VDUPLN has its index embedded. Its size can be inferred from the Opcode.
2406 assert(Opc >= ARM::VDUPLN16d && Opc <= ARM::VDUPLN8q &&
2407 "Unexpected Opcode");
2408 esize = (Opc == ARM::VDUPLN8d || Opc == ARM::VDUPLN8q) ? ESize8
2409 : ((Opc == ARM::VDUPLN16d || Opc == ARM::VDUPLN16q) ? ESize16
2413 // Qd/Dd = Inst{22:15-12} => NEON Rd
2414 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2415 decodeNEONRd(insn))));
2419 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2421 MI.addOperand(MCOperand::CreateReg(0));
2425 // Dm = Inst{5:3-0} => NEON Rm
2426 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2427 decodeNEONRm(insn))));
2430 // VZIP and others have two TIED_TO reg operands.
2432 while (OpIdx < NumOps &&
2433 (Idx = TID.getOperandConstraint(OpIdx, TOI::TIED_TO)) != -1) {
2434 // Add TIED_TO operand.
2435 MI.addOperand(MI.getOperand(Idx));
2439 // Add the imm operand, if required.
2440 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2441 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2443 unsigned imm = 0xFFFFFFFF;
2445 if (Flag == N2V_VectorDupLane)
2446 imm = decodeNVLaneDupIndex(insn, esize);
2447 if (Flag == N2V_VectorConvert_Between_Float_Fixed)
2448 imm = decodeVCVTFractionBits(insn);
2450 assert(imm != 0xFFFFFFFF && "Internal error");
2451 MI.addOperand(MCOperand::CreateImm(imm));
2458 static bool DisassembleN2RegFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2459 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2461 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2464 static bool DisassembleNVCVTFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2465 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2467 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2468 N2V_VectorConvert_Between_Float_Fixed, B);
2470 static bool DisassembleNVecDupLnFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2471 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2473 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2474 N2V_VectorDupLane, B);
2477 // Vector Shift [Accumulate] Instructions.
2478 // Qd/Dd [Qd/Dd (TIED_TO)] Qm/Dm ShiftAmt
2480 // Vector Shift Left Long (with maximum shift count) Instructions.
2481 // VSHLLi16, VSHLLi32, VSHLLi8: Qd Dm imm (== size)
2483 static bool DisassembleNVectorShift(MCInst &MI, unsigned Opcode, uint32_t insn,
2484 unsigned short NumOps, unsigned &NumOpsAdded, bool LeftShift, BO B) {
2486 const TargetInstrDesc &TID = ARMInsts[Opcode];
2487 const TargetOperandInfo *OpInfo = TID.OpInfo;
2489 assert(NumOps >= 3 &&
2490 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2491 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2492 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2493 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2494 "Expect >= 3 operands and first 2 as reg operands");
2496 unsigned &OpIdx = NumOpsAdded;
2500 // Qd/Dd = Inst{22:15-12} => NEON Rd
2501 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2502 decodeNEONRd(insn))));
2505 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2507 MI.addOperand(MCOperand::CreateReg(0));
2511 assert((OpInfo[OpIdx].RegClass == ARM::DPRRegClassID ||
2512 OpInfo[OpIdx].RegClass == ARM::QPRRegClassID) &&
2513 "Reg operand expected");
2515 // Qm/Dm = Inst{5:3-0} => NEON Rm
2516 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2517 decodeNEONRm(insn))));
2520 assert(OpInfo[OpIdx].RegClass < 0 && "Imm operand expected");
2522 // Add the imm operand.
2524 // VSHLL has maximum shift count as the imm, inferred from its size.
2528 Imm = decodeNVSAmt(insn, LeftShift);
2540 MI.addOperand(MCOperand::CreateImm(Imm));
2546 // Left shift instructions.
2547 static bool DisassembleN2RegVecShLFrm(MCInst &MI, unsigned Opcode,
2548 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2550 return DisassembleNVectorShift(MI, Opcode, insn, NumOps, NumOpsAdded, true,
2553 // Right shift instructions have different shift amount interpretation.
2554 static bool DisassembleN2RegVecShRFrm(MCInst &MI, unsigned Opcode,
2555 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2557 return DisassembleNVectorShift(MI, Opcode, insn, NumOps, NumOpsAdded, false,
2566 N3V_Multiply_By_Scalar
2568 } // End of unnamed namespace
2570 // NEON Three Register Instructions with Optional Immediate Operand
2572 // Vector Extract Instructions.
2573 // Qd/Dd Qn/Dn Qm/Dm imm4
2575 // Vector Shift (Register) Instructions.
2576 // Qd/Dd Qm/Dm Qn/Dn (notice the order of m, n)
2578 // Vector Multiply [Accumulate/Subtract] [Long] By Scalar Instructions.
2579 // Qd/Dd Qn/Dn RestrictedDm index
2582 static bool DisassembleNVdVnVmOptImm(MCInst &MI, unsigned Opcode, uint32_t insn,
2583 unsigned short NumOps, unsigned &NumOpsAdded, N3VFlag Flag, BO B) {
2585 const TargetInstrDesc &TID = ARMInsts[Opcode];
2586 const TargetOperandInfo *OpInfo = TID.OpInfo;
2588 // No checking for OpInfo[2] because of MOVDneon/MOVQ with only two regs.
2589 assert(NumOps >= 3 &&
2590 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2591 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2592 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2593 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2594 "Expect >= 3 operands and first 2 as reg operands");
2596 unsigned &OpIdx = NumOpsAdded;
2600 bool VdVnVm = Flag == N3V_VectorShift ? false : true;
2601 bool IsImm4 = Flag == N3V_VectorExtract ? true : false;
2602 bool IsDmRestricted = Flag == N3V_Multiply_By_Scalar ? true : false;
2603 ElemSize esize = ESizeNA;
2604 if (Flag == N3V_Multiply_By_Scalar) {
2605 unsigned size = (insn >> 20) & 3;
2606 if (size == 1) esize = ESize16;
2607 if (size == 2) esize = ESize32;
2608 assert (esize == ESize16 || esize == ESize32);
2611 // Qd/Dd = Inst{22:15-12} => NEON Rd
2612 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2613 decodeNEONRd(insn))));
2616 // VABA, VABAL, VBSLd, VBSLq, ...
2617 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2619 MI.addOperand(MCOperand::CreateReg(0));
2623 // Dn = Inst{7:19-16} => NEON Rn
2625 // Dm = Inst{5:3-0} => NEON Rm
2626 MI.addOperand(MCOperand::CreateReg(
2627 getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2628 VdVnVm ? decodeNEONRn(insn)
2629 : decodeNEONRm(insn))));
2632 // Special case handling for VMOVDneon and VMOVQ because they are marked as
2634 if (Opcode == ARM::VMOVDneon || Opcode == ARM::VMOVQ)
2637 // Dm = Inst{5:3-0} => NEON Rm
2639 // Dm is restricted to D0-D7 if size is 16, D0-D15 otherwise
2641 // Dn = Inst{7:19-16} => NEON Rn
2642 unsigned m = VdVnVm ? (IsDmRestricted ? decodeRestrictedDm(insn, esize)
2643 : decodeNEONRm(insn))
2644 : decodeNEONRn(insn);
2646 MI.addOperand(MCOperand::CreateReg(
2647 getRegisterEnum(B, OpInfo[OpIdx].RegClass, m)));
2650 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2651 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2652 // Add the imm operand.
2655 Imm = decodeN3VImm(insn);
2656 else if (IsDmRestricted)
2657 Imm = decodeRestrictedDmIndex(insn, esize);
2659 assert(0 && "Internal error: unreachable code!");
2663 MI.addOperand(MCOperand::CreateImm(Imm));
2670 static bool DisassembleN3RegFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2671 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2673 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2676 static bool DisassembleN3RegVecShFrm(MCInst &MI, unsigned Opcode,
2677 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2679 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2680 N3V_VectorShift, B);
2682 static bool DisassembleNVecExtractFrm(MCInst &MI, unsigned Opcode,
2683 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2685 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2686 N3V_VectorExtract, B);
2688 static bool DisassembleNVecMulScalarFrm(MCInst &MI, unsigned Opcode,
2689 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2691 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2692 N3V_Multiply_By_Scalar, B);
2695 // Vector Table Lookup
2697 // VTBL1, VTBX1: Dd [Dd(TIED_TO)] Dn Dm
2698 // VTBL2, VTBX2: Dd [Dd(TIED_TO)] Dn Dn+1 Dm
2699 // VTBL3, VTBX3: Dd [Dd(TIED_TO)] Dn Dn+1 Dn+2 Dm
2700 // VTBL4, VTBX4: Dd [Dd(TIED_TO)] Dn Dn+1 Dn+2 Dn+3 Dm
2701 static bool DisassembleNVTBLFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2702 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2704 const TargetInstrDesc &TID = ARMInsts[Opcode];
2705 const TargetOperandInfo *OpInfo = TID.OpInfo;
2706 if (!OpInfo) return false;
2708 assert(NumOps >= 3 &&
2709 OpInfo[0].RegClass == ARM::DPRRegClassID &&
2710 OpInfo[1].RegClass == ARM::DPRRegClassID &&
2711 OpInfo[2].RegClass == ARM::DPRRegClassID &&
2712 "Expect >= 3 operands and first 3 as reg operands");
2714 unsigned &OpIdx = NumOpsAdded;
2718 unsigned Rn = decodeNEONRn(insn);
2720 // {Dn} encoded as len = 0b00
2721 // {Dn Dn+1} encoded as len = 0b01
2722 // {Dn Dn+1 Dn+2 } encoded as len = 0b10
2723 // {Dn Dn+1 Dn+2 Dn+3} encoded as len = 0b11
2724 unsigned Len = slice(insn, 9, 8) + 1;
2726 // Dd (the destination vector)
2727 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2728 decodeNEONRd(insn))));
2731 // Process tied_to operand constraint.
2733 if ((Idx = TID.getOperandConstraint(OpIdx, TOI::TIED_TO)) != -1) {
2734 MI.addOperand(MI.getOperand(Idx));
2738 // Do the <list> now.
2739 for (unsigned i = 0; i < Len; ++i) {
2740 assert(OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::DPRRegClassID &&
2741 "Reg operand expected");
2742 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2747 // Dm (the index vector)
2748 assert(OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::DPRRegClassID &&
2749 "Reg operand (index vector) expected");
2750 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2751 decodeNEONRm(insn))));
2757 // Vector Get Lane (move scalar to ARM core register) Instructions.
2758 // VGETLNi32, VGETLNs16, VGETLNs8, VGETLNu16, VGETLNu8: Rt Dn index
2759 static bool DisassembleNGetLnFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2760 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2762 const TargetInstrDesc &TID = ARMInsts[Opcode];
2763 const TargetOperandInfo *OpInfo = TID.OpInfo;
2764 if (!OpInfo) return false;
2766 assert(TID.getNumDefs() == 1 && NumOps >= 3 &&
2767 OpInfo[0].RegClass == ARM::GPRRegClassID &&
2768 OpInfo[1].RegClass == ARM::DPRRegClassID &&
2769 OpInfo[2].RegClass < 0 &&
2770 "Expect >= 3 operands with one dst operand");
2773 Opcode == ARM::VGETLNi32 ? ESize32
2774 : ((Opcode == ARM::VGETLNs16 || Opcode == ARM::VGETLNu16) ? ESize16
2777 // Rt = Inst{15-12} => ARM Rd
2778 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2781 // Dn = Inst{7:19-16} => NEON Rn
2782 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2783 decodeNEONRn(insn))));
2785 MI.addOperand(MCOperand::CreateImm(decodeNVLaneOpIndex(insn, esize)));
2791 // Vector Set Lane (move ARM core register to scalar) Instructions.
2792 // VSETLNi16, VSETLNi32, VSETLNi8: Dd Dd (TIED_TO) Rt index
2793 static bool DisassembleNSetLnFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2794 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2796 const TargetInstrDesc &TID = ARMInsts[Opcode];
2797 const TargetOperandInfo *OpInfo = TID.OpInfo;
2798 if (!OpInfo) return false;
2800 assert(TID.getNumDefs() == 1 && NumOps >= 3 &&
2801 OpInfo[0].RegClass == ARM::DPRRegClassID &&
2802 OpInfo[1].RegClass == ARM::DPRRegClassID &&
2803 TID.getOperandConstraint(1, TOI::TIED_TO) != -1 &&
2804 OpInfo[2].RegClass == ARM::GPRRegClassID &&
2805 OpInfo[3].RegClass < 0 &&
2806 "Expect >= 3 operands with one dst operand");
2809 Opcode == ARM::VSETLNi8 ? ESize8
2810 : (Opcode == ARM::VSETLNi16 ? ESize16
2813 // Dd = Inst{7:19-16} => NEON Rn
2814 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2815 decodeNEONRn(insn))));
2818 MI.addOperand(MCOperand::CreateReg(0));
2820 // Rt = Inst{15-12} => ARM Rd
2821 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2824 MI.addOperand(MCOperand::CreateImm(decodeNVLaneOpIndex(insn, esize)));
2830 // Vector Duplicate Instructions (from ARM core register to all elements).
2831 // VDUP8d, VDUP16d, VDUP32d, VDUP8q, VDUP16q, VDUP32q: Qd/Dd Rt
2832 static bool DisassembleNDupFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2833 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2835 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
2837 assert(NumOps >= 2 &&
2838 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2839 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2840 OpInfo[1].RegClass == ARM::GPRRegClassID &&
2841 "Expect >= 2 operands and first 2 as reg operand");
2843 unsigned RegClass = OpInfo[0].RegClass;
2845 // Qd/Dd = Inst{7:19-16} => NEON Rn
2846 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClass,
2847 decodeNEONRn(insn))));
2849 // Rt = Inst{15-12} => ARM Rd
2850 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2860 static inline bool MemBarrierInstr(uint32_t insn) {
2861 unsigned op7_4 = slice(insn, 7, 4);
2862 if (slice(insn, 31, 8) == 0xf57ff0 && (op7_4 >= 4 && op7_4 <= 6))
2868 static inline bool PreLoadOpcode(unsigned Opcode) {
2870 case ARM::PLDi12: case ARM::PLDrs:
2871 case ARM::PLDWi12: case ARM::PLDWrs:
2872 case ARM::PLIi12: case ARM::PLIrs:
2879 static bool DisassemblePreLoadFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2880 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2882 // Preload Data/Instruction requires either 2 or 3 operands.
2883 // PLDi, PLDWi, PLIi: addrmode_imm12
2884 // PLDr[a|m], PLDWr[a|m], PLIr[a|m]: ldst_so_reg
2886 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2889 if (Opcode == ARM::PLDi12 || Opcode == ARM::PLDWi12
2890 || Opcode == ARM::PLIi12) {
2891 unsigned Imm12 = slice(insn, 11, 0);
2892 bool Negative = getUBit(insn) == 0;
2893 // -0 is represented specially. All other values are as normal.
2894 if (Imm12 == 0 && Negative)
2896 MI.addOperand(MCOperand::CreateImm(Imm12));
2899 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2902 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
2904 // Inst{6-5} encodes the shift opcode.
2905 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
2906 // Inst{11-7} encodes the imm5 shift amount.
2907 unsigned ShImm = slice(insn, 11, 7);
2909 // A8.4.1. Possible rrx or shift amount of 32...
2910 getImmShiftSE(ShOp, ShImm);
2911 MI.addOperand(MCOperand::CreateImm(
2912 ARM_AM::getAM2Opc(AddrOpcode, ShImm, ShOp)));
2919 static bool DisassembleMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2920 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2922 if (MemBarrierInstr(insn)) {
2923 // DMBsy, DSBsy, and ISBsy instructions have zero operand and are taken care
2924 // of within the generic ARMBasicMCBuilder::BuildIt() method.
2926 // Inst{3-0} encodes the memory barrier option for the variants.
2927 MI.addOperand(MCOperand::CreateImm(slice(insn, 3, 0)));
2945 if (Opcode == ARM::SETEND) {
2947 MI.addOperand(MCOperand::CreateImm(slice(insn, 9, 9)));
2951 // FIXME: To enable correct asm parsing and disasm of CPS we need 3 different
2952 // opcodes which match the same real instruction. This is needed since there's
2953 // no current handling of optional arguments. Fix here when a better handling
2954 // of optional arguments is implemented.
2955 if (Opcode == ARM::CPS3p) {
2956 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 18))); // imod
2957 MI.addOperand(MCOperand::CreateImm(slice(insn, 8, 6))); // iflags
2958 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0))); // mode
2962 if (Opcode == ARM::CPS2p) {
2963 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 18))); // imod
2964 MI.addOperand(MCOperand::CreateImm(slice(insn, 8, 6))); // iflags
2968 if (Opcode == ARM::CPS1p) {
2969 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0))); // mode
2974 // DBG has its option specified in Inst{3-0}.
2975 if (Opcode == ARM::DBG) {
2976 MI.addOperand(MCOperand::CreateImm(slice(insn, 3, 0)));
2981 // BKPT takes an imm32 val equal to ZeroExtend(Inst{19-8:3-0}).
2982 if (Opcode == ARM::BKPT) {
2983 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 8) << 4 |
2984 slice(insn, 3, 0)));
2989 if (PreLoadOpcode(Opcode))
2990 return DisassemblePreLoadFrm(MI, Opcode, insn, NumOps, NumOpsAdded, B);
2992 assert(0 && "Unexpected misc instruction!");
2996 /// FuncPtrs - FuncPtrs maps ARMFormat to its corresponding DisassembleFP.
2997 /// We divide the disassembly task into different categories, with each one
2998 /// corresponding to a specific instruction encoding format. There could be
2999 /// exceptions when handling a specific format, and that is why the Opcode is
3000 /// also present in the function prototype.
3001 static const DisassembleFP FuncPtrs[] = {
3005 &DisassembleBrMiscFrm,
3007 &DisassembleDPSoRegFrm,
3010 &DisassembleLdMiscFrm,
3011 &DisassembleStMiscFrm,
3012 &DisassembleLdStMulFrm,
3013 &DisassembleLdStExFrm,
3014 &DisassembleArithMiscFrm,
3017 &DisassembleVFPUnaryFrm,
3018 &DisassembleVFPBinaryFrm,
3019 &DisassembleVFPConv1Frm,
3020 &DisassembleVFPConv2Frm,
3021 &DisassembleVFPConv3Frm,
3022 &DisassembleVFPConv4Frm,
3023 &DisassembleVFPConv5Frm,
3024 &DisassembleVFPLdStFrm,
3025 &DisassembleVFPLdStMulFrm,
3026 &DisassembleVFPMiscFrm,
3027 &DisassembleThumbFrm,
3028 &DisassembleMiscFrm,
3029 &DisassembleNGetLnFrm,
3030 &DisassembleNSetLnFrm,
3031 &DisassembleNDupFrm,
3033 // VLD and VST (including one lane) Instructions.
3036 // A7.4.6 One register and a modified immediate value
3037 // 1-Register Instructions with imm.
3038 // LLVM only defines VMOVv instructions.
3039 &DisassembleN1RegModImmFrm,
3041 // 2-Register Instructions with no imm.
3042 &DisassembleN2RegFrm,
3044 // 2-Register Instructions with imm (vector convert float/fixed point).
3045 &DisassembleNVCVTFrm,
3047 // 2-Register Instructions with imm (vector dup lane).
3048 &DisassembleNVecDupLnFrm,
3050 // Vector Shift Left Instructions.
3051 &DisassembleN2RegVecShLFrm,
3053 // Vector Shift Righ Instructions, which has different interpretation of the
3054 // shift amount from the imm6 field.
3055 &DisassembleN2RegVecShRFrm,
3057 // 3-Register Data-Processing Instructions.
3058 &DisassembleN3RegFrm,
3060 // Vector Shift (Register) Instructions.
3061 // D:Vd M:Vm N:Vn (notice that M:Vm is the first operand)
3062 &DisassembleN3RegVecShFrm,
3064 // Vector Extract Instructions.
3065 &DisassembleNVecExtractFrm,
3067 // Vector [Saturating Rounding Doubling] Multiply [Accumulate/Subtract] [Long]
3068 // By Scalar Instructions.
3069 &DisassembleNVecMulScalarFrm,
3071 // Vector Table Lookup uses byte indexes in a control vector to look up byte
3072 // values in a table and generate a new vector.
3073 &DisassembleNVTBLFrm,
3078 /// BuildIt - BuildIt performs the build step for this ARM Basic MC Builder.
3079 /// The general idea is to set the Opcode for the MCInst, followed by adding
3080 /// the appropriate MCOperands to the MCInst. ARM Basic MC Builder delegates
3081 /// to the Format-specific disassemble function for disassembly, followed by
3082 /// TryPredicateAndSBitModifier() to do PredicateOperand and OptionalDefOperand
3083 /// which follow the Dst/Src Operands.
3084 bool ARMBasicMCBuilder::BuildIt(MCInst &MI, uint32_t insn) {
3085 // Stage 1 sets the Opcode.
3086 MI.setOpcode(Opcode);
3087 // If the number of operands is zero, we're done!
3091 // Stage 2 calls the format-specific disassemble function to build the operand
3095 unsigned NumOpsAdded = 0;
3096 bool OK = (*Disasm)(MI, Opcode, insn, NumOps, NumOpsAdded, this);
3098 if (!OK || this->Err != 0) return false;
3099 if (NumOpsAdded >= NumOps)
3102 // Stage 3 deals with operands unaccounted for after stage 2 is finished.
3103 // FIXME: Should this be done selectively?
3104 return TryPredicateAndSBitModifier(MI, Opcode, insn, NumOps - NumOpsAdded);
3107 // A8.3 Conditional execution
3108 // A8.3.1 Pseudocode details of conditional execution
3109 // Condition bits '111x' indicate the instruction is always executed.
3110 static uint32_t CondCode(uint32_t CondField) {
3111 if (CondField == 0xF)
3116 /// DoPredicateOperands - DoPredicateOperands process the predicate operands
3117 /// of some Thumb instructions which come before the reglist operands. It
3118 /// returns true if the two predicate operands have been processed.
3119 bool ARMBasicMCBuilder::DoPredicateOperands(MCInst& MI, unsigned Opcode,
3120 uint32_t /* insn */, unsigned short NumOpsRemaining) {
3122 assert(NumOpsRemaining > 0 && "Invalid argument");
3124 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3125 unsigned Idx = MI.getNumOperands();
3127 // First, we check whether this instr specifies the PredicateOperand through
3128 // a pair of TargetOperandInfos with isPredicate() property.
3129 if (NumOpsRemaining >= 2 &&
3130 OpInfo[Idx].isPredicate() && OpInfo[Idx+1].isPredicate() &&
3131 OpInfo[Idx].RegClass < 0 &&
3132 OpInfo[Idx+1].RegClass == ARM::CCRRegClassID)
3134 // If we are inside an IT block, get the IT condition bits maintained via
3135 // ARMBasicMCBuilder::ITState[7:0], through ARMBasicMCBuilder::GetITCond().
3138 MI.addOperand(MCOperand::CreateImm(GetITCond()));
3140 MI.addOperand(MCOperand::CreateImm(ARMCC::AL));
3141 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
3148 /// TryPredicateAndSBitModifier - TryPredicateAndSBitModifier tries to process
3149 /// the possible Predicate and SBitModifier, to build the remaining MCOperand
3151 bool ARMBasicMCBuilder::TryPredicateAndSBitModifier(MCInst& MI, unsigned Opcode,
3152 uint32_t insn, unsigned short NumOpsRemaining) {
3154 assert(NumOpsRemaining > 0 && "Invalid argument");
3156 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3157 const std::string &Name = ARMInsts[Opcode].Name;
3158 unsigned Idx = MI.getNumOperands();
3160 // First, we check whether this instr specifies the PredicateOperand through
3161 // a pair of TargetOperandInfos with isPredicate() property.
3162 if (NumOpsRemaining >= 2 &&
3163 OpInfo[Idx].isPredicate() && OpInfo[Idx+1].isPredicate() &&
3164 OpInfo[Idx].RegClass < 0 &&
3165 OpInfo[Idx+1].RegClass == ARM::CCRRegClassID)
3167 // If we are inside an IT block, get the IT condition bits maintained via
3168 // ARMBasicMCBuilder::ITState[7:0], through ARMBasicMCBuilder::GetITCond().
3171 MI.addOperand(MCOperand::CreateImm(GetITCond()));
3173 if (Name.length() > 1 && Name[0] == 't') {
3174 // Thumb conditional branch instructions have their cond field embedded,
3178 if (Name == "t2Bcc")
3179 MI.addOperand(MCOperand::CreateImm(CondCode(slice(insn, 25, 22))));
3180 else if (Name == "tBcc")
3181 MI.addOperand(MCOperand::CreateImm(CondCode(slice(insn, 11, 8))));
3183 MI.addOperand(MCOperand::CreateImm(ARMCC::AL));
3185 // ARM instructions get their condition field from Inst{31-28}.
3186 MI.addOperand(MCOperand::CreateImm(CondCode(getCondField(insn))));
3189 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
3191 NumOpsRemaining -= 2;
3194 if (NumOpsRemaining == 0)
3197 // Next, if OptionalDefOperand exists, we check whether the 'S' bit is set.
3198 if (OpInfo[Idx].isOptionalDef() && OpInfo[Idx].RegClass==ARM::CCRRegClassID) {
3199 MI.addOperand(MCOperand::CreateReg(getSBit(insn) == 1 ? ARM::CPSR : 0));
3203 if (NumOpsRemaining == 0)
3209 /// RunBuildAfterHook - RunBuildAfterHook performs operations deemed necessary
3210 /// after BuildIt is finished.
3211 bool ARMBasicMCBuilder::RunBuildAfterHook(bool Status, MCInst &MI,
3214 if (!SP) return Status;
3216 if (Opcode == ARM::t2IT)
3217 Status = SP->InitIT(slice(insn, 7, 0)) ? Status : false;
3218 else if (InITBlock())
3224 /// Opcode, Format, and NumOperands make up an ARM Basic MCBuilder.
3225 ARMBasicMCBuilder::ARMBasicMCBuilder(unsigned opc, ARMFormat format,
3227 : Opcode(opc), Format(format), NumOps(num), SP(0), Err(0) {
3228 unsigned Idx = (unsigned)format;
3229 assert(Idx < (array_lengthof(FuncPtrs) - 1) && "Unknown format");
3230 Disasm = FuncPtrs[Idx];
3233 /// CreateMCBuilder - Return an ARMBasicMCBuilder that can build up the MC
3234 /// infrastructure of an MCInst given the Opcode and Format of the instr.
3235 /// Return NULL if it fails to create/return a proper builder. API clients
3236 /// are responsible for freeing up of the allocated memory. Cacheing can be
3237 /// performed by the API clients to improve performance.
3238 ARMBasicMCBuilder *llvm::CreateMCBuilder(unsigned Opcode, ARMFormat Format) {
3239 // For "Unknown format", fail by returning a NULL pointer.
3240 if ((unsigned)Format >= (array_lengthof(FuncPtrs) - 1)) {
3241 DEBUG(errs() << "Unknown format\n");
3245 return new ARMBasicMCBuilder(Opcode, Format,
3246 ARMInsts[Opcode].getNumOperands());