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 const TargetInstrDesc &TID = ARMInsts[Opcode];
648 (TID.TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift;
649 unsigned Offset = ARM_AM::getAM2Opc(AddrOpcode, slice(insn, 7, 0) << 2,
650 ARM_AM::no_shift, IndexMode);
651 MI.addOperand(MCOperand::CreateImm(Offset));
654 MI.addOperand(MCOperand::CreateImm(slice(insn, 7, 0)));
658 MI.addOperand(MCOperand::CreateImm(OneCopOpc ? GetCopOpc(insn)
659 : GetCopOpc1(insn, NoGPR)));
661 MI.addOperand(NoGPR ? MCOperand::CreateImm(decodeRd(insn))
662 : MCOperand::CreateReg(
663 getRegisterEnum(B, ARM::GPRRegClassID,
666 MI.addOperand(OneCopOpc ? MCOperand::CreateReg(
667 getRegisterEnum(B, ARM::GPRRegClassID,
669 : MCOperand::CreateImm(decodeRn(insn)));
671 MI.addOperand(MCOperand::CreateImm(decodeRm(insn)));
676 MI.addOperand(MCOperand::CreateImm(GetCopOpc2(insn)));
684 // Branch Instructions.
685 // BL: SignExtend(Imm24:'00', 32)
686 // Bcc, BL_pred: SignExtend(Imm24:'00', 32) Pred0 Pred1
687 // SMC: ZeroExtend(imm4, 32)
688 // SVC: ZeroExtend(Imm24, 32)
690 // Various coprocessor instructions are assigned BrFrm arbitrarily.
691 // Delegates to DisassembleCoprocessor() helper function.
694 // MSR/MSRsys: Rm mask=Inst{19-16}
696 // MSRi/MSRsysi: so_imm
697 // SRSW/SRS: ldstm_mode:$amode mode_imm
698 // RFEW/RFE: ldstm_mode:$amode Rn
699 static bool DisassembleBrFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
700 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
702 if (CoprocessorOpcode(Opcode))
703 return DisassembleCoprocessor(MI, Opcode, insn, NumOps, NumOpsAdded, B);
705 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
706 if (!OpInfo) return false;
708 // MRS and MRSsys take one GPR reg Rd.
709 if (Opcode == ARM::MRS || Opcode == ARM::MRSsys) {
710 assert(NumOps >= 1 && OpInfo[0].RegClass == ARM::GPRRegClassID &&
711 "Reg operand expected");
712 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
717 // BXJ takes one GPR reg Rm.
718 if (Opcode == ARM::BXJ) {
719 assert(NumOps >= 1 && OpInfo[0].RegClass == ARM::GPRRegClassID &&
720 "Reg operand expected");
721 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
726 // MSR take a mask, followed by one GPR reg Rm. The mask contains the R Bit in
727 // bit 4, and the special register fields in bits 3-0.
728 if (Opcode == ARM::MSR) {
729 assert(NumOps >= 1 && OpInfo[1].RegClass == ARM::GPRRegClassID &&
730 "Reg operand expected");
731 MI.addOperand(MCOperand::CreateImm(slice(insn, 22, 22) << 4 /* R Bit */ |
732 slice(insn, 19, 16) /* Special Reg */ ));
733 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
738 // MSRi take a mask, followed by one so_imm operand. The mask contains the
739 // R Bit in bit 4, and the special register fields in bits 3-0.
740 if (Opcode == ARM::MSRi) {
741 MI.addOperand(MCOperand::CreateImm(slice(insn, 22, 22) << 4 /* R Bit */ |
742 slice(insn, 19, 16) /* Special Reg */ ));
743 // SOImm is 4-bit rotate amount in bits 11-8 with 8-bit imm in bits 7-0.
744 // A5.2.4 Rotate amount is twice the numeric value of Inst{11-8}.
745 // See also ARMAddressingModes.h: getSOImmValImm() and getSOImmValRot().
746 unsigned Rot = (insn >> ARMII::SoRotImmShift) & 0xF;
747 unsigned Imm = insn & 0xFF;
748 MI.addOperand(MCOperand::CreateImm(ARM_AM::rotr32(Imm, 2*Rot)));
752 if (Opcode == ARM::SRSW || Opcode == ARM::SRS ||
753 Opcode == ARM::RFEW || Opcode == ARM::RFE) {
754 ARM_AM::AMSubMode SubMode = getAMSubModeForBits(getPUBits(insn));
755 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM4ModeImm(SubMode)));
757 if (Opcode == ARM::SRSW || Opcode == ARM::SRS)
758 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0)));
760 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
766 assert((Opcode == ARM::Bcc || Opcode == ARM::BL || Opcode == ARM::BL_pred
767 || Opcode == ARM::SMC || Opcode == ARM::SVC) &&
768 "Unexpected Opcode");
770 assert(NumOps >= 1 && OpInfo[0].RegClass < 0 && "Reg operand expected");
773 if (Opcode == ARM::SMC) {
774 // ZeroExtend(imm4, 32) where imm24 = Inst{3-0}.
775 Imm32 = slice(insn, 3, 0);
776 } else if (Opcode == ARM::SVC) {
777 // ZeroExtend(imm24, 32) where imm24 = Inst{23-0}.
778 Imm32 = slice(insn, 23, 0);
780 // SignExtend(imm24:'00', 32) where imm24 = Inst{23-0}.
781 unsigned Imm26 = slice(insn, 23, 0) << 2;
782 //Imm32 = signextend<signed int, 26>(Imm26);
783 Imm32 = SignExtend32<26>(Imm26);
786 MI.addOperand(MCOperand::CreateImm(Imm32));
792 // Misc. Branch Instructions.
795 static bool DisassembleBrMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
796 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
798 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
799 if (!OpInfo) return false;
801 unsigned &OpIdx = NumOpsAdded;
805 // BX_RET and MOVPCLR have only two predicate operands; do an early return.
806 if (Opcode == ARM::BX_RET || Opcode == ARM::MOVPCLR)
809 // BLX and BX take one GPR reg.
810 if (Opcode == ARM::BLX || Opcode == ARM::BLX_pred ||
812 assert(NumOps >= 1 && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
813 "Reg operand expected");
814 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
823 static inline bool getBFCInvMask(uint32_t insn, uint32_t &mask) {
824 uint32_t lsb = slice(insn, 11, 7);
825 uint32_t msb = slice(insn, 20, 16);
828 DEBUG(errs() << "Encoding error: msb < lsb\n");
832 for (uint32_t i = lsb; i <= msb; ++i)
838 // A major complication is the fact that some of the saturating add/subtract
839 // operations have Rd Rm Rn, instead of the "normal" Rd Rn Rm.
840 // They are QADD, QDADD, QDSUB, and QSUB.
841 static bool DisassembleDPFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
842 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
844 const TargetInstrDesc &TID = ARMInsts[Opcode];
845 unsigned short NumDefs = TID.getNumDefs();
846 bool isUnary = isUnaryDP(TID.TSFlags);
847 const TargetOperandInfo *OpInfo = TID.OpInfo;
848 unsigned &OpIdx = NumOpsAdded;
852 // Disassemble register def if there is one.
853 if (NumDefs && (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID)) {
854 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
859 // Now disassemble the src operands.
863 // Special-case handling of BFC/BFI/SBFX/UBFX.
864 if (Opcode == ARM::BFC || Opcode == ARM::BFI) {
865 MI.addOperand(MCOperand::CreateReg(0));
866 if (Opcode == ARM::BFI) {
867 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
872 if (!getBFCInvMask(insn, mask))
875 MI.addOperand(MCOperand::CreateImm(mask));
879 if (Opcode == ARM::SBFX || Opcode == ARM::UBFX) {
880 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
882 MI.addOperand(MCOperand::CreateImm(slice(insn, 11, 7)));
883 MI.addOperand(MCOperand::CreateImm(slice(insn, 20, 16) + 1));
888 bool RmRn = (Opcode == ARM::QADD || Opcode == ARM::QDADD ||
889 Opcode == ARM::QDSUB || Opcode == ARM::QSUB);
891 // BinaryDP has an Rn operand.
893 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
894 "Reg operand expected");
895 MI.addOperand(MCOperand::CreateReg(
896 getRegisterEnum(B, ARM::GPRRegClassID,
897 RmRn ? decodeRm(insn) : decodeRn(insn))));
901 // If this is a two-address operand, skip it, e.g., MOVCCr operand 1.
902 if (isUnary && (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)) {
903 MI.addOperand(MCOperand::CreateReg(0));
907 // Now disassemble operand 2.
911 if (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) {
912 // We have a reg/reg form.
913 // Assert disabled because saturating operations, e.g., A8.6.127 QASX, are
914 // routed here as well.
915 // assert(getIBit(insn) == 0 && "I_Bit != '0' reg/reg form");
916 MI.addOperand(MCOperand::CreateReg(
917 getRegisterEnum(B, ARM::GPRRegClassID,
918 RmRn? decodeRn(insn) : decodeRm(insn))));
920 } else if (Opcode == ARM::MOVi16 || Opcode == ARM::MOVTi16) {
921 // We have an imm16 = imm4:imm12 (imm4=Inst{19:16}, imm12 = Inst{11:0}).
922 assert(getIBit(insn) == 1 && "I_Bit != '1' reg/imm form");
923 unsigned Imm16 = slice(insn, 19, 16) << 12 | slice(insn, 11, 0);
924 MI.addOperand(MCOperand::CreateImm(Imm16));
927 // We have a reg/imm form.
928 // SOImm is 4-bit rotate amount in bits 11-8 with 8-bit imm in bits 7-0.
929 // A5.2.4 Rotate amount is twice the numeric value of Inst{11-8}.
930 // See also ARMAddressingModes.h: getSOImmValImm() and getSOImmValRot().
931 assert(getIBit(insn) == 1 && "I_Bit != '1' reg/imm form");
932 unsigned Rot = (insn >> ARMII::SoRotImmShift) & 0xF;
933 unsigned Imm = insn & 0xFF;
934 MI.addOperand(MCOperand::CreateImm(ARM_AM::rotr32(Imm, 2*Rot)));
941 static bool DisassembleDPSoRegFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
942 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
944 const TargetInstrDesc &TID = ARMInsts[Opcode];
945 unsigned short NumDefs = TID.getNumDefs();
946 bool isUnary = isUnaryDP(TID.TSFlags);
947 const TargetOperandInfo *OpInfo = TID.OpInfo;
948 unsigned &OpIdx = NumOpsAdded;
952 // Disassemble register def if there is one.
953 if (NumDefs && (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID)) {
954 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
959 // Disassemble the src operands.
963 // BinaryDP has an Rn operand.
965 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
966 "Reg operand expected");
967 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
972 // If this is a two-address operand, skip it, e.g., MOVCCs operand 1.
973 if (isUnary && (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)) {
974 MI.addOperand(MCOperand::CreateReg(0));
978 // Disassemble operand 2, which consists of three components.
979 if (OpIdx + 2 >= NumOps)
982 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
983 (OpInfo[OpIdx+1].RegClass == ARM::GPRRegClassID) &&
984 (OpInfo[OpIdx+2].RegClass < 0) &&
985 "Expect 3 reg operands");
987 // Register-controlled shifts have Inst{7} = 0 and Inst{4} = 1.
988 unsigned Rs = slice(insn, 4, 4);
990 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
993 // Register-controlled shifts: [Rm, Rs, shift].
994 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
996 // Inst{6-5} encodes the shift opcode.
997 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
998 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(ShOp, 0)));
1000 // Constant shifts: [Rm, reg0, shift_imm].
1001 MI.addOperand(MCOperand::CreateReg(0)); // NoRegister
1002 // Inst{6-5} encodes the shift opcode.
1003 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1004 // Inst{11-7} encodes the imm5 shift amount.
1005 unsigned ShImm = slice(insn, 11, 7);
1007 // A8.4.1. Possible rrx or shift amount of 32...
1008 getImmShiftSE(ShOp, ShImm);
1009 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(ShOp, ShImm)));
1016 static bool DisassembleLdStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1017 unsigned short NumOps, unsigned &NumOpsAdded, bool isStore, BO B) {
1019 const TargetInstrDesc &TID = ARMInsts[Opcode];
1020 bool isPrePost = isPrePostLdSt(TID.TSFlags);
1021 const TargetOperandInfo *OpInfo = TID.OpInfo;
1022 if (!OpInfo) return false;
1024 unsigned &OpIdx = NumOpsAdded;
1028 assert(((!isStore && TID.getNumDefs() > 0) ||
1029 (isStore && (TID.getNumDefs() == 0 || isPrePost)))
1030 && "Invalid arguments");
1032 // Operand 0 of a pre- and post-indexed store is the address base writeback.
1033 if (isPrePost && isStore) {
1034 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1035 "Reg operand expected");
1036 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1041 // Disassemble the dst/src operand.
1042 if (OpIdx >= NumOps)
1045 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1046 "Reg operand expected");
1047 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1051 // After dst of a pre- and post-indexed load is the address base writeback.
1052 if (isPrePost && !isStore) {
1053 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1054 "Reg operand expected");
1055 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1060 // Disassemble the base operand.
1061 if (OpIdx >= NumOps)
1064 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1065 "Reg operand expected");
1066 assert((!isPrePost || (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1))
1067 && "Index mode or tied_to operand expected");
1068 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1072 // For reg/reg form, base reg is followed by +/- reg shop imm.
1073 // For immediate form, it is followed by +/- imm12.
1074 // See also ARMAddressingModes.h (Addressing Mode #2).
1075 if (OpIdx + 1 >= NumOps)
1078 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1079 unsigned IndexMode =
1080 (TID.TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift;
1081 if (getIBit(insn) == 0) {
1082 // For pre- and post-indexed case, add a reg0 operand (Addressing Mode #2).
1083 // Otherwise, skip the reg operand since for addrmode_imm12, Rn has already
1086 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,
1094 MI.addOperand(MCOperand::CreateImm(Offset));
1097 // Disassemble the offset reg (Rm), shift type, and immediate shift length.
1098 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1100 // Inst{6-5} encodes the shift opcode.
1101 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1102 // Inst{11-7} encodes the imm5 shift amount.
1103 unsigned ShImm = slice(insn, 11, 7);
1105 // A8.4.1. Possible rrx or shift amount of 32...
1106 getImmShiftSE(ShOp, ShImm);
1107 MI.addOperand(MCOperand::CreateImm(
1108 ARM_AM::getAM2Opc(AddrOpcode, ShImm, ShOp, IndexMode)));
1115 static bool DisassembleLdFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1116 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1117 return DisassembleLdStFrm(MI, Opcode, insn, NumOps, NumOpsAdded, false, B);
1120 static bool DisassembleStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1121 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1122 return DisassembleLdStFrm(MI, Opcode, insn, NumOps, NumOpsAdded, true, B);
1125 static bool HasDualReg(unsigned Opcode) {
1129 case ARM::LDRD: case ARM::LDRD_PRE: case ARM::LDRD_POST:
1130 case ARM::STRD: case ARM::STRD_PRE: case ARM::STRD_POST:
1135 static bool DisassembleLdStMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1136 unsigned short NumOps, unsigned &NumOpsAdded, bool isStore, BO B) {
1138 const TargetInstrDesc &TID = ARMInsts[Opcode];
1139 bool isPrePost = isPrePostLdSt(TID.TSFlags);
1140 const TargetOperandInfo *OpInfo = TID.OpInfo;
1141 if (!OpInfo) return false;
1143 unsigned &OpIdx = NumOpsAdded;
1147 assert(((!isStore && TID.getNumDefs() > 0) ||
1148 (isStore && (TID.getNumDefs() == 0 || isPrePost)))
1149 && "Invalid arguments");
1151 // Operand 0 of a pre- and post-indexed store is the address base writeback.
1152 if (isPrePost && isStore) {
1153 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1154 "Reg operand expected");
1155 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1160 bool DualReg = HasDualReg(Opcode);
1162 // Disassemble the dst/src operand.
1163 if (OpIdx >= NumOps)
1166 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1167 "Reg operand expected");
1168 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1172 // Fill in LDRD and STRD's second operand, but only if it's offset mode OR we
1173 // have a pre-or-post-indexed store operation.
1174 if (DualReg && (!isPrePost || isStore)) {
1175 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1176 decodeRd(insn) + 1)));
1180 // After dst of a pre- and post-indexed load is the address base writeback.
1181 if (isPrePost && !isStore) {
1182 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1183 "Reg operand expected");
1184 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1189 // Disassemble the base operand.
1190 if (OpIdx >= NumOps)
1193 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1194 "Reg operand expected");
1195 assert((!isPrePost || (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1))
1196 && "Offset mode or tied_to operand expected");
1197 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1201 // For reg/reg form, base reg is followed by +/- reg.
1202 // For immediate form, it is followed by +/- imm8.
1203 // See also ARMAddressingModes.h (Addressing Mode #3).
1204 if (OpIdx + 1 >= NumOps)
1207 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
1208 (OpInfo[OpIdx+1].RegClass < 0) &&
1209 "Expect 1 reg operand followed by 1 imm operand");
1211 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1212 if (getAM3IBit(insn) == 1) {
1213 MI.addOperand(MCOperand::CreateReg(0));
1215 // Disassemble the 8-bit immediate offset.
1216 unsigned Imm4H = (insn >> ARMII::ImmHiShift) & 0xF;
1217 unsigned Imm4L = insn & 0xF;
1218 unsigned Offset = ARM_AM::getAM3Opc(AddrOpcode, (Imm4H << 4) | Imm4L);
1219 MI.addOperand(MCOperand::CreateImm(Offset));
1221 // Disassemble the offset reg (Rm).
1222 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1224 unsigned Offset = ARM_AM::getAM3Opc(AddrOpcode, 0);
1225 MI.addOperand(MCOperand::CreateImm(Offset));
1232 static bool DisassembleLdMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1233 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1234 return DisassembleLdStMiscFrm(MI, Opcode, insn, NumOps, NumOpsAdded, false,
1238 static bool DisassembleStMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1239 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1240 return DisassembleLdStMiscFrm(MI, Opcode, insn, NumOps, NumOpsAdded, true, B);
1243 // The algorithm for disassembly of LdStMulFrm is different from others because
1244 // it explicitly populates the two predicate operands after the base register.
1245 // After that, we need to populate the reglist with each affected register
1246 // encoded as an MCOperand.
1247 static bool DisassembleLdStMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1248 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1250 assert(NumOps >= 4 && "LdStMulFrm expects NumOps >= 4");
1253 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1255 // Writeback to base, if necessary.
1256 if (Opcode == ARM::LDMIA_UPD || Opcode == ARM::STMIA_UPD ||
1257 Opcode == ARM::LDMDA_UPD || Opcode == ARM::STMDA_UPD ||
1258 Opcode == ARM::LDMDB_UPD || Opcode == ARM::STMDB_UPD ||
1259 Opcode == ARM::LDMIB_UPD || Opcode == ARM::STMIB_UPD) {
1260 MI.addOperand(MCOperand::CreateReg(Base));
1264 // Add the base register operand.
1265 MI.addOperand(MCOperand::CreateReg(Base));
1267 // Handling the two predicate operands before the reglist.
1268 int64_t CondVal = insn >> ARMII::CondShift;
1269 MI.addOperand(MCOperand::CreateImm(CondVal == 0xF ? 0xE : CondVal));
1270 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
1274 // Fill the variadic part of reglist.
1275 unsigned RegListBits = insn & ((1 << 16) - 1);
1276 for (unsigned i = 0; i < 16; ++i) {
1277 if ((RegListBits >> i) & 1) {
1278 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1287 // LDREX, LDREXB, LDREXH: Rd Rn
1288 // LDREXD: Rd Rd+1 Rn
1289 // STREX, STREXB, STREXH: Rd Rm Rn
1290 // STREXD: Rd Rm Rm+1 Rn
1292 // SWP, SWPB: Rd Rm Rn
1293 static bool DisassembleLdStExFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1294 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1296 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1297 if (!OpInfo) return false;
1299 unsigned &OpIdx = NumOpsAdded;
1304 && OpInfo[0].RegClass == ARM::GPRRegClassID
1305 && OpInfo[1].RegClass == ARM::GPRRegClassID
1306 && "Expect 2 reg operands");
1308 bool isStore = slice(insn, 20, 20) == 0;
1309 bool isDW = (Opcode == ARM::LDREXD || Opcode == ARM::STREXD);
1311 // Add the destination operand.
1312 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1316 // Store register Exclusive needs a source operand.
1318 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1323 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1324 decodeRm(insn)+1)));
1328 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1329 decodeRd(insn)+1)));
1333 // Finally add the pointer operand.
1334 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1341 // Misc. Arithmetic Instructions.
1343 // PKHBT, PKHTB: Rd Rn Rm , LSL/ASR #imm5
1344 // RBIT, REV, REV16, REVSH: Rd Rm
1345 static bool DisassembleArithMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1346 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1348 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1349 unsigned &OpIdx = NumOpsAdded;
1354 && OpInfo[0].RegClass == ARM::GPRRegClassID
1355 && OpInfo[1].RegClass == ARM::GPRRegClassID
1356 && "Expect 2 reg operands");
1358 bool ThreeReg = NumOps > 2 && OpInfo[2].RegClass == ARM::GPRRegClassID;
1360 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1365 assert(NumOps >= 4 && "Expect >= 4 operands");
1366 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1371 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1375 // If there is still an operand info left which is an immediate operand, add
1376 // an additional imm5 LSL/ASR operand.
1377 if (ThreeReg && OpInfo[OpIdx].RegClass < 0
1378 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1379 // Extract the 5-bit immediate field Inst{11-7}.
1380 unsigned ShiftAmt = (insn >> ARMII::ShiftShift) & 0x1F;
1381 ARM_AM::ShiftOpc Opc = ARM_AM::no_shift;
1382 if (Opcode == ARM::PKHBT)
1384 else if (Opcode == ARM::PKHBT)
1386 getImmShiftSE(Opc, ShiftAmt);
1387 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(Opc, ShiftAmt)));
1394 /// DisassembleSatFrm - Disassemble saturate instructions:
1395 /// SSAT, SSAT16, USAT, and USAT16.
1396 static bool DisassembleSatFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1397 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1399 const TargetInstrDesc &TID = ARMInsts[Opcode];
1400 NumOpsAdded = TID.getNumOperands() - 2; // ignore predicate operands
1402 // Disassemble register def.
1403 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1406 unsigned Pos = slice(insn, 20, 16);
1407 if (Opcode == ARM::SSAT || Opcode == ARM::SSAT16)
1409 MI.addOperand(MCOperand::CreateImm(Pos));
1411 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1414 if (NumOpsAdded == 4) {
1415 ARM_AM::ShiftOpc Opc = (slice(insn, 6, 6) != 0 ? ARM_AM::asr : ARM_AM::lsl);
1416 // Inst{11-7} encodes the imm5 shift amount.
1417 unsigned ShAmt = slice(insn, 11, 7);
1419 // A8.6.183. Possible ASR shift amount of 32...
1420 if (Opc == ARM_AM::asr)
1423 Opc = ARM_AM::no_shift;
1425 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(Opc, ShAmt)));
1430 // Extend instructions.
1431 // SXT* and UXT*: Rd [Rn] Rm [rot_imm].
1432 // The 2nd operand register is Rn and the 3rd operand regsiter is Rm for the
1433 // three register operand form. Otherwise, Rn=0b1111 and only Rm is used.
1434 static bool DisassembleExtFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1435 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1437 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1438 unsigned &OpIdx = NumOpsAdded;
1443 && OpInfo[0].RegClass == ARM::GPRRegClassID
1444 && OpInfo[1].RegClass == ARM::GPRRegClassID
1445 && "Expect 2 reg operands");
1447 bool ThreeReg = NumOps > 2 && OpInfo[2].RegClass == ARM::GPRRegClassID;
1449 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1454 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1459 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1463 // If there is still an operand info left which is an immediate operand, add
1464 // an additional rotate immediate operand.
1465 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
1466 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1467 // Extract the 2-bit rotate field Inst{11-10}.
1468 unsigned rot = (insn >> ARMII::ExtRotImmShift) & 3;
1469 // Rotation by 8, 16, or 24 bits.
1470 MI.addOperand(MCOperand::CreateImm(rot << 3));
1477 /////////////////////////////////////
1479 // Utility Functions For VFP //
1481 /////////////////////////////////////
1483 // Extract/Decode Dd/Sd:
1485 // SP => d = UInt(Vd:D)
1486 // DP => d = UInt(D:Vd)
1487 static unsigned decodeVFPRd(uint32_t insn, bool isSPVFP) {
1488 return isSPVFP ? (decodeRd(insn) << 1 | getDBit(insn))
1489 : (decodeRd(insn) | getDBit(insn) << 4);
1492 // Extract/Decode Dn/Sn:
1494 // SP => n = UInt(Vn:N)
1495 // DP => n = UInt(N:Vn)
1496 static unsigned decodeVFPRn(uint32_t insn, bool isSPVFP) {
1497 return isSPVFP ? (decodeRn(insn) << 1 | getNBit(insn))
1498 : (decodeRn(insn) | getNBit(insn) << 4);
1501 // Extract/Decode Dm/Sm:
1503 // SP => m = UInt(Vm:M)
1504 // DP => m = UInt(M:Vm)
1505 static unsigned decodeVFPRm(uint32_t insn, bool isSPVFP) {
1506 return isSPVFP ? (decodeRm(insn) << 1 | getMBit(insn))
1507 : (decodeRm(insn) | getMBit(insn) << 4);
1511 static APInt VFPExpandImm(unsigned char byte, unsigned N) {
1512 assert(N == 32 || N == 64);
1515 unsigned bit6 = slice(byte, 6, 6);
1517 Result = slice(byte, 7, 7) << 31 | slice(byte, 5, 0) << 19;
1519 Result |= 0x1f << 25;
1521 Result |= 0x1 << 30;
1523 Result = (uint64_t)slice(byte, 7, 7) << 63 |
1524 (uint64_t)slice(byte, 5, 0) << 48;
1526 Result |= 0xffULL << 54;
1528 Result |= 0x1ULL << 62;
1530 return APInt(N, Result);
1533 // VFP Unary Format Instructions:
1535 // VCMP[E]ZD, VCMP[E]ZS: compares one floating-point register with zero
1536 // VCVTDS, VCVTSD: converts between double-precision and single-precision
1537 // The rest of the instructions have homogeneous [VFP]Rd and [VFP]Rm registers.
1538 static bool DisassembleVFPUnaryFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1539 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1541 assert(NumOps >= 1 && "VFPUnaryFrm expects NumOps >= 1");
1543 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1544 unsigned &OpIdx = NumOpsAdded;
1548 unsigned RegClass = OpInfo[OpIdx].RegClass;
1549 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1550 "Reg operand expected");
1551 bool isSP = (RegClass == ARM::SPRRegClassID);
1553 MI.addOperand(MCOperand::CreateReg(
1554 getRegisterEnum(B, RegClass, decodeVFPRd(insn, isSP))));
1557 // Early return for compare with zero instructions.
1558 if (Opcode == ARM::VCMPEZD || Opcode == ARM::VCMPEZS
1559 || Opcode == ARM::VCMPZD || Opcode == ARM::VCMPZS)
1562 RegClass = OpInfo[OpIdx].RegClass;
1563 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1564 "Reg operand expected");
1565 isSP = (RegClass == ARM::SPRRegClassID);
1567 MI.addOperand(MCOperand::CreateReg(
1568 getRegisterEnum(B, RegClass, decodeVFPRm(insn, isSP))));
1574 // All the instructions have homogeneous [VFP]Rd, [VFP]Rn, and [VFP]Rm regs.
1575 // Some of them have operand constraints which tie the first operand in the
1576 // InOperandList to that of the dst. As far as asm printing is concerned, this
1577 // tied_to operand is simply skipped.
1578 static bool DisassembleVFPBinaryFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1579 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1581 assert(NumOps >= 3 && "VFPBinaryFrm expects NumOps >= 3");
1583 const TargetInstrDesc &TID = ARMInsts[Opcode];
1584 const TargetOperandInfo *OpInfo = TID.OpInfo;
1585 unsigned &OpIdx = NumOpsAdded;
1589 unsigned RegClass = OpInfo[OpIdx].RegClass;
1590 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1591 "Reg operand expected");
1592 bool isSP = (RegClass == ARM::SPRRegClassID);
1594 MI.addOperand(MCOperand::CreateReg(
1595 getRegisterEnum(B, RegClass, decodeVFPRd(insn, isSP))));
1598 // Skip tied_to operand constraint.
1599 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
1600 assert(NumOps >= 4 && "Expect >=4 operands");
1601 MI.addOperand(MCOperand::CreateReg(0));
1605 MI.addOperand(MCOperand::CreateReg(
1606 getRegisterEnum(B, RegClass, decodeVFPRn(insn, isSP))));
1609 MI.addOperand(MCOperand::CreateReg(
1610 getRegisterEnum(B, RegClass, decodeVFPRm(insn, isSP))));
1616 // A8.6.295 vcvt (floating-point <-> integer)
1617 // Int to FP: VSITOD, VSITOS, VUITOD, VUITOS
1618 // FP to Int: VTOSI[Z|R]D, VTOSI[Z|R]S, VTOUI[Z|R]D, VTOUI[Z|R]S
1620 // A8.6.297 vcvt (floating-point and fixed-point)
1621 // Dd|Sd Dd|Sd(TIED_TO) #fbits(= 16|32 - UInt(imm4:i))
1622 static bool DisassembleVFPConv1Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1623 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1625 assert(NumOps >= 2 && "VFPConv1Frm expects NumOps >= 2");
1627 const TargetInstrDesc &TID = ARMInsts[Opcode];
1628 const TargetOperandInfo *OpInfo = TID.OpInfo;
1629 if (!OpInfo) return false;
1631 bool SP = slice(insn, 8, 8) == 0; // A8.6.295 & A8.6.297
1632 bool fixed_point = slice(insn, 17, 17) == 1; // A8.6.297
1633 unsigned RegClassID = SP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1637 assert(NumOps >= 3 && "Expect >= 3 operands");
1638 int size = slice(insn, 7, 7) == 0 ? 16 : 32;
1639 int fbits = size - (slice(insn,3,0) << 1 | slice(insn,5,5));
1640 MI.addOperand(MCOperand::CreateReg(
1641 getRegisterEnum(B, RegClassID,
1642 decodeVFPRd(insn, SP))));
1644 assert(TID.getOperandConstraint(1, TOI::TIED_TO) != -1 &&
1645 "Tied to operand expected");
1646 MI.addOperand(MI.getOperand(0));
1648 assert(OpInfo[2].RegClass < 0 && !OpInfo[2].isPredicate() &&
1649 !OpInfo[2].isOptionalDef() && "Imm operand expected");
1650 MI.addOperand(MCOperand::CreateImm(fbits));
1655 // The Rd (destination) and Rm (source) bits have different interpretations
1656 // depending on their single-precisonness.
1658 if (slice(insn, 18, 18) == 1) { // to_integer operation
1659 d = decodeVFPRd(insn, true /* Is Single Precision */);
1660 MI.addOperand(MCOperand::CreateReg(
1661 getRegisterEnum(B, ARM::SPRRegClassID, d)));
1662 m = decodeVFPRm(insn, SP);
1663 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, m)));
1665 d = decodeVFPRd(insn, SP);
1666 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, d)));
1667 m = decodeVFPRm(insn, true /* Is Single Precision */);
1668 MI.addOperand(MCOperand::CreateReg(
1669 getRegisterEnum(B, ARM::SPRRegClassID, m)));
1677 // VMOVRS - A8.6.330
1678 // Rt => Rd; Sn => UInt(Vn:N)
1679 static bool DisassembleVFPConv2Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1680 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1682 assert(NumOps >= 2 && "VFPConv2Frm expects NumOps >= 2");
1684 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1686 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1687 decodeVFPRn(insn, true))));
1692 // VMOVRRD - A8.6.332
1693 // Rt => Rd; Rt2 => Rn; Dm => UInt(M:Vm)
1695 // VMOVRRS - A8.6.331
1696 // Rt => Rd; Rt2 => Rn; Sm => UInt(Vm:M); Sm1 = Sm+1
1697 static bool DisassembleVFPConv3Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1698 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1700 assert(NumOps >= 3 && "VFPConv3Frm expects NumOps >= 3");
1702 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1703 unsigned &OpIdx = NumOpsAdded;
1705 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1707 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1711 if (OpInfo[OpIdx].RegClass == ARM::SPRRegClassID) {
1712 unsigned Sm = decodeVFPRm(insn, true);
1713 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1715 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1719 MI.addOperand(MCOperand::CreateReg(
1720 getRegisterEnum(B, ARM::DPRRegClassID,
1721 decodeVFPRm(insn, false))));
1727 // VMOVSR - A8.6.330
1728 // Rt => Rd; Sn => UInt(Vn:N)
1729 static bool DisassembleVFPConv4Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1730 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1732 assert(NumOps >= 2 && "VFPConv4Frm expects NumOps >= 2");
1734 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1735 decodeVFPRn(insn, true))));
1736 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1742 // VMOVDRR - A8.6.332
1743 // Rt => Rd; Rt2 => Rn; Dm => UInt(M:Vm)
1745 // VMOVRRS - A8.6.331
1746 // Rt => Rd; Rt2 => Rn; Sm => UInt(Vm:M); Sm1 = Sm+1
1747 static bool DisassembleVFPConv5Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1748 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1750 assert(NumOps >= 3 && "VFPConv5Frm expects NumOps >= 3");
1752 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1753 unsigned &OpIdx = NumOpsAdded;
1757 if (OpInfo[OpIdx].RegClass == ARM::SPRRegClassID) {
1758 unsigned Sm = decodeVFPRm(insn, true);
1759 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1761 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1765 MI.addOperand(MCOperand::CreateReg(
1766 getRegisterEnum(B, ARM::DPRRegClassID,
1767 decodeVFPRm(insn, false))));
1771 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1773 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1779 // VFP Load/Store Instructions.
1780 // VLDRD, VLDRS, VSTRD, VSTRS
1781 static bool DisassembleVFPLdStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1782 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1784 assert(NumOps >= 3 && "VFPLdStFrm expects NumOps >= 3");
1786 bool isSPVFP = (Opcode == ARM::VLDRS || Opcode == ARM::VSTRS);
1787 unsigned RegClassID = isSPVFP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1789 // Extract Dd/Sd for operand 0.
1790 unsigned RegD = decodeVFPRd(insn, isSPVFP);
1792 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, RegD)));
1794 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1795 MI.addOperand(MCOperand::CreateReg(Base));
1797 // Next comes the AM5 Opcode.
1798 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1799 unsigned char Imm8 = insn & 0xFF;
1800 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(AddrOpcode, Imm8)));
1807 // VFP Load/Store Multiple Instructions.
1808 // We have an optional write back reg, the base, and two predicate operands.
1809 // It is then followed by a reglist of either DPR(s) or SPR(s).
1811 // VLDMD[_UPD], VLDMS[_UPD], VSTMD[_UPD], VSTMS[_UPD]
1812 static bool DisassembleVFPLdStMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1813 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1815 assert(NumOps >= 4 && "VFPLdStMulFrm expects NumOps >= 4");
1817 unsigned &OpIdx = NumOpsAdded;
1821 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1823 // Writeback to base, if necessary.
1824 if (Opcode == ARM::VLDMDIA_UPD || Opcode == ARM::VLDMSIA_UPD ||
1825 Opcode == ARM::VLDMDDB_UPD || Opcode == ARM::VLDMSDB_UPD ||
1826 Opcode == ARM::VSTMDIA_UPD || Opcode == ARM::VSTMSIA_UPD ||
1827 Opcode == ARM::VSTMDDB_UPD || Opcode == ARM::VSTMSDB_UPD) {
1828 MI.addOperand(MCOperand::CreateReg(Base));
1832 MI.addOperand(MCOperand::CreateReg(Base));
1834 // Handling the two predicate operands before the reglist.
1835 int64_t CondVal = insn >> ARMII::CondShift;
1836 MI.addOperand(MCOperand::CreateImm(CondVal == 0xF ? 0xE : CondVal));
1837 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
1841 bool isSPVFP = (Opcode == ARM::VLDMSIA ||
1842 Opcode == ARM::VLDMSIA_UPD || Opcode == ARM::VLDMSDB_UPD ||
1843 Opcode == ARM::VSTMSIA ||
1844 Opcode == ARM::VSTMSIA_UPD || Opcode == ARM::VSTMSDB_UPD);
1845 unsigned RegClassID = isSPVFP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1848 unsigned RegD = decodeVFPRd(insn, isSPVFP);
1850 // Fill the variadic part of reglist.
1851 unsigned char Imm8 = insn & 0xFF;
1852 unsigned Regs = isSPVFP ? Imm8 : Imm8/2;
1854 // Apply some sanity checks before proceeding.
1855 if (Regs == 0 || (RegD + Regs) > 32 || (!isSPVFP && Regs > 16))
1858 for (unsigned i = 0; i < Regs; ++i) {
1859 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID,
1867 // Misc. VFP Instructions.
1868 // FMSTAT (vmrs with Rt=0b1111, i.e., to apsr_nzcv and no register operand)
1869 // FCONSTD (DPR and a VFPf64Imm operand)
1870 // FCONSTS (SPR and a VFPf32Imm operand)
1871 // VMRS/VMSR (GPR operand)
1872 static bool DisassembleVFPMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1873 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1875 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1876 unsigned &OpIdx = NumOpsAdded;
1880 if (Opcode == ARM::FMSTAT)
1883 assert(NumOps >= 2 && "VFPMiscFrm expects >=2 operands");
1885 unsigned RegEnum = 0;
1886 switch (OpInfo[0].RegClass) {
1887 case ARM::DPRRegClassID:
1888 RegEnum = getRegisterEnum(B, ARM::DPRRegClassID, decodeVFPRd(insn, false));
1890 case ARM::SPRRegClassID:
1891 RegEnum = getRegisterEnum(B, ARM::SPRRegClassID, decodeVFPRd(insn, true));
1893 case ARM::GPRRegClassID:
1894 RegEnum = getRegisterEnum(B, ARM::GPRRegClassID, decodeRd(insn));
1897 assert(0 && "Invalid reg class id");
1901 MI.addOperand(MCOperand::CreateReg(RegEnum));
1904 // Extract/decode the f64/f32 immediate.
1905 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
1906 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1907 // The asm syntax specifies the floating point value, not the 8-bit literal.
1908 APInt immRaw = VFPExpandImm(slice(insn,19,16) << 4 | slice(insn, 3, 0),
1909 Opcode == ARM::FCONSTD ? 64 : 32);
1910 APFloat immFP = APFloat(immRaw, true);
1911 double imm = Opcode == ARM::FCONSTD ? immFP.convertToDouble() :
1912 immFP.convertToFloat();
1913 MI.addOperand(MCOperand::CreateFPImm(imm));
1921 // DisassembleThumbFrm() is defined in ThumbDisassemblerCore.h file.
1922 #include "ThumbDisassemblerCore.h"
1924 /////////////////////////////////////////////////////
1926 // Utility Functions For ARM Advanced SIMD //
1928 /////////////////////////////////////////////////////
1930 // The following NEON namings are based on A8.6.266 VABA, VABAL. Notice that
1931 // A8.6.303 VDUP (ARM core register)'s D/Vd pair is the N/Vn pair of VABA/VABAL.
1933 // A7.3 Register encoding
1935 // Extract/Decode NEON D/Vd:
1937 // Note that for quadword, Qd = UInt(D:Vd<3:1>) = Inst{22:15-13}, whereas for
1938 // doubleword, Dd = UInt(D:Vd). We compensate for this difference by
1939 // handling it in the getRegisterEnum() utility function.
1940 // D = Inst{22}, Vd = Inst{15-12}
1941 static unsigned decodeNEONRd(uint32_t insn) {
1942 return ((insn >> ARMII::NEON_D_BitShift) & 1) << 4
1943 | ((insn >> ARMII::NEON_RegRdShift) & ARMII::NEONRegMask);
1946 // Extract/Decode NEON N/Vn:
1948 // Note that for quadword, Qn = UInt(N:Vn<3:1>) = Inst{7:19-17}, whereas for
1949 // doubleword, Dn = UInt(N:Vn). We compensate for this difference by
1950 // handling it in the getRegisterEnum() utility function.
1951 // N = Inst{7}, Vn = Inst{19-16}
1952 static unsigned decodeNEONRn(uint32_t insn) {
1953 return ((insn >> ARMII::NEON_N_BitShift) & 1) << 4
1954 | ((insn >> ARMII::NEON_RegRnShift) & ARMII::NEONRegMask);
1957 // Extract/Decode NEON M/Vm:
1959 // Note that for quadword, Qm = UInt(M:Vm<3:1>) = Inst{5:3-1}, whereas for
1960 // doubleword, Dm = UInt(M:Vm). We compensate for this difference by
1961 // handling it in the getRegisterEnum() utility function.
1962 // M = Inst{5}, Vm = Inst{3-0}
1963 static unsigned decodeNEONRm(uint32_t insn) {
1964 return ((insn >> ARMII::NEON_M_BitShift) & 1) << 4
1965 | ((insn >> ARMII::NEON_RegRmShift) & ARMII::NEONRegMask);
1976 } // End of unnamed namespace
1978 // size field -> Inst{11-10}
1979 // index_align field -> Inst{7-4}
1981 // The Lane Index interpretation depends on the Data Size:
1982 // 8 (encoded as size = 0b00) -> Index = index_align[3:1]
1983 // 16 (encoded as size = 0b01) -> Index = index_align[3:2]
1984 // 32 (encoded as size = 0b10) -> Index = index_align[3]
1986 // Ref: A8.6.317 VLD4 (single 4-element structure to one lane).
1987 static unsigned decodeLaneIndex(uint32_t insn) {
1988 unsigned size = insn >> 10 & 3;
1989 assert((size == 0 || size == 1 || size == 2) &&
1990 "Encoding error: size should be either 0, 1, or 2");
1992 unsigned index_align = insn >> 4 & 0xF;
1993 return (index_align >> 1) >> size;
1996 // imm64 = AdvSIMDExpandImm(op, cmode, i:imm3:imm4)
1997 // op = Inst{5}, cmode = Inst{11-8}
1998 // i = Inst{24} (ARM architecture)
1999 // imm3 = Inst{18-16}, imm4 = Inst{3-0}
2000 // Ref: Table A7-15 Modified immediate values for Advanced SIMD instructions.
2001 static uint64_t decodeN1VImm(uint32_t insn, ElemSize esize) {
2002 unsigned char op = (insn >> 5) & 1;
2003 unsigned char cmode = (insn >> 8) & 0xF;
2004 unsigned char Imm8 = ((insn >> 24) & 1) << 7 |
2005 ((insn >> 16) & 7) << 4 |
2007 return (op << 12) | (cmode << 8) | Imm8;
2010 // A8.6.339 VMUL, VMULL (by scalar)
2011 // ESize16 => m = Inst{2-0} (Vm<2:0>) D0-D7
2012 // ESize32 => m = Inst{3-0} (Vm<3:0>) D0-D15
2013 static unsigned decodeRestrictedDm(uint32_t insn, ElemSize esize) {
2020 assert(0 && "Unreachable code!");
2025 // A8.6.339 VMUL, VMULL (by scalar)
2026 // ESize16 => index = Inst{5:3} (M:Vm<3>) D0-D7
2027 // ESize32 => index = Inst{5} (M) D0-D15
2028 static unsigned decodeRestrictedDmIndex(uint32_t insn, ElemSize esize) {
2031 return (((insn >> 5) & 1) << 1) | ((insn >> 3) & 1);
2033 return (insn >> 5) & 1;
2035 assert(0 && "Unreachable code!");
2040 // A8.6.296 VCVT (between floating-point and fixed-point, Advanced SIMD)
2041 // (64 - <fbits>) is encoded as imm6, i.e., Inst{21-16}.
2042 static unsigned decodeVCVTFractionBits(uint32_t insn) {
2043 return 64 - ((insn >> 16) & 0x3F);
2046 // A8.6.302 VDUP (scalar)
2047 // ESize8 => index = Inst{19-17}
2048 // ESize16 => index = Inst{19-18}
2049 // ESize32 => index = Inst{19}
2050 static unsigned decodeNVLaneDupIndex(uint32_t insn, ElemSize esize) {
2053 return (insn >> 17) & 7;
2055 return (insn >> 18) & 3;
2057 return (insn >> 19) & 1;
2059 assert(0 && "Unspecified element size!");
2064 // A8.6.328 VMOV (ARM core register to scalar)
2065 // A8.6.329 VMOV (scalar to ARM core register)
2066 // ESize8 => index = Inst{21:6-5}
2067 // ESize16 => index = Inst{21:6}
2068 // ESize32 => index = Inst{21}
2069 static unsigned decodeNVLaneOpIndex(uint32_t insn, ElemSize esize) {
2072 return ((insn >> 21) & 1) << 2 | ((insn >> 5) & 3);
2074 return ((insn >> 21) & 1) << 1 | ((insn >> 6) & 1);
2076 return ((insn >> 21) & 1);
2078 assert(0 && "Unspecified element size!");
2083 // Imm6 = Inst{21-16}, L = Inst{7}
2085 // LeftShift == true (A8.6.367 VQSHL, A8.6.387 VSLI):
2087 // '0001xxx' => esize = 8; shift_amount = imm6 - 8
2088 // '001xxxx' => esize = 16; shift_amount = imm6 - 16
2089 // '01xxxxx' => esize = 32; shift_amount = imm6 - 32
2090 // '1xxxxxx' => esize = 64; shift_amount = imm6
2092 // LeftShift == false (A8.6.376 VRSHR, A8.6.368 VQSHRN):
2094 // '0001xxx' => esize = 8; shift_amount = 16 - imm6
2095 // '001xxxx' => esize = 16; shift_amount = 32 - imm6
2096 // '01xxxxx' => esize = 32; shift_amount = 64 - imm6
2097 // '1xxxxxx' => esize = 64; shift_amount = 64 - imm6
2099 static unsigned decodeNVSAmt(uint32_t insn, bool LeftShift) {
2100 ElemSize esize = ESizeNA;
2101 unsigned L = (insn >> 7) & 1;
2102 unsigned imm6 = (insn >> 16) & 0x3F;
2106 else if (imm6 >> 4 == 1)
2108 else if (imm6 >> 5 == 1)
2111 assert(0 && "Wrong encoding of Inst{7:21-16}!");
2116 return esize == ESize64 ? imm6 : (imm6 - esize);
2118 return esize == ESize64 ? (esize - imm6) : (2*esize - imm6);
2122 // Imm4 = Inst{11-8}
2123 static unsigned decodeN3VImm(uint32_t insn) {
2124 return (insn >> 8) & 0xF;
2128 // D[d] D[d2] ... Rn [TIED_TO Rn] align [Rm]
2130 // D[d] D[d2] ... Rn [TIED_TO Rn] align [Rm] TIED_TO ... imm(idx)
2132 // Rn [TIED_TO Rn] align [Rm] D[d] D[d2] ...
2134 // Rn [TIED_TO Rn] align [Rm] D[d] D[d2] ... [imm(idx)]
2136 // Correctly set VLD*/VST*'s TIED_TO GPR, as the asm printer needs it.
2137 static bool DisassembleNLdSt0(MCInst &MI, unsigned Opcode, uint32_t insn,
2138 unsigned short NumOps, unsigned &NumOpsAdded, bool Store, bool DblSpaced,
2141 const TargetInstrDesc &TID = ARMInsts[Opcode];
2142 const TargetOperandInfo *OpInfo = TID.OpInfo;
2144 // At least one DPR register plus addressing mode #6.
2145 assert(NumOps >= 3 && "Expect >= 3 operands");
2147 unsigned &OpIdx = NumOpsAdded;
2151 // We have homogeneous NEON registers for Load/Store.
2152 unsigned RegClass = 0;
2154 // Double-spaced registers have increments of 2.
2155 unsigned Inc = DblSpaced ? 2 : 1;
2157 unsigned Rn = decodeRn(insn);
2158 unsigned Rm = decodeRm(insn);
2159 unsigned Rd = decodeNEONRd(insn);
2161 // A7.7.1 Advanced SIMD addressing mode.
2164 // LLVM Addressing Mode #6.
2165 unsigned RmEnum = 0;
2167 RmEnum = getRegisterEnum(B, ARM::GPRRegClassID, Rm);
2170 // Consume possible WB, AddrMode6, possible increment reg, the DPR/QPR's,
2171 // then possible lane index.
2172 assert(OpIdx < NumOps && OpInfo[0].RegClass == ARM::GPRRegClassID &&
2173 "Reg operand expected");
2176 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2181 assert((OpIdx+1) < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
2182 OpInfo[OpIdx + 1].RegClass < 0 && "Addrmode #6 Operands expected");
2183 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2185 MI.addOperand(MCOperand::CreateImm(0)); // Alignment ignored?
2189 MI.addOperand(MCOperand::CreateReg(RmEnum));
2193 assert(OpIdx < NumOps &&
2194 (OpInfo[OpIdx].RegClass == ARM::DPRRegClassID ||
2195 OpInfo[OpIdx].RegClass == ARM::QPRRegClassID) &&
2196 "Reg operand expected");
2198 RegClass = OpInfo[OpIdx].RegClass;
2199 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2200 MI.addOperand(MCOperand::CreateReg(
2201 getRegisterEnum(B, RegClass, Rd)));
2206 // Handle possible lane index.
2207 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2208 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2209 MI.addOperand(MCOperand::CreateImm(decodeLaneIndex(insn)));
2214 // Consume the DPR/QPR's, possible WB, AddrMode6, possible incrment reg,
2215 // possible TIED_TO DPR/QPR's (ignored), then possible lane index.
2216 RegClass = OpInfo[0].RegClass;
2218 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2219 MI.addOperand(MCOperand::CreateReg(
2220 getRegisterEnum(B, RegClass, Rd)));
2226 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2231 assert((OpIdx+1) < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
2232 OpInfo[OpIdx + 1].RegClass < 0 && "Addrmode #6 Operands expected");
2233 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2235 MI.addOperand(MCOperand::CreateImm(0)); // Alignment ignored?
2239 MI.addOperand(MCOperand::CreateReg(RmEnum));
2243 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2244 assert(TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1 &&
2245 "Tied to operand expected");
2246 MI.addOperand(MCOperand::CreateReg(0));
2250 // Handle possible lane index.
2251 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2252 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2253 MI.addOperand(MCOperand::CreateImm(decodeLaneIndex(insn)));
2258 // Accessing registers past the end of the NEON register file is not
2267 // If L (Inst{21}) == 0, store instructions.
2268 // Find out about double-spaced-ness of the Opcode and pass it on to
2269 // DisassembleNLdSt0().
2270 static bool DisassembleNLdSt(MCInst &MI, unsigned Opcode, uint32_t insn,
2271 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2273 const StringRef Name = ARMInsts[Opcode].Name;
2274 bool DblSpaced = false;
2276 if (Name.find("LN") != std::string::npos) {
2277 // To one lane instructions.
2278 // See, for example, 8.6.317 VLD4 (single 4-element structure to one lane).
2280 // <size> == 16 && Inst{5} == 1 --> DblSpaced = true
2281 if (Name.endswith("16") || Name.endswith("16_UPD"))
2282 DblSpaced = slice(insn, 5, 5) == 1;
2284 // <size> == 32 && Inst{6} == 1 --> DblSpaced = true
2285 if (Name.endswith("32") || Name.endswith("32_UPD"))
2286 DblSpaced = slice(insn, 6, 6) == 1;
2289 // Multiple n-element structures with type encoded as Inst{11-8}.
2290 // See, for example, A8.6.316 VLD4 (multiple 4-element structures).
2292 // n == 2 && type == 0b1001 -> DblSpaced = true
2293 if (Name.startswith("VST2") || Name.startswith("VLD2"))
2294 DblSpaced = slice(insn, 11, 8) == 9;
2296 // n == 3 && type == 0b0101 -> DblSpaced = true
2297 if (Name.startswith("VST3") || Name.startswith("VLD3"))
2298 DblSpaced = slice(insn, 11, 8) == 5;
2300 // n == 4 && type == 0b0001 -> DblSpaced = true
2301 if (Name.startswith("VST4") || Name.startswith("VLD4"))
2302 DblSpaced = slice(insn, 11, 8) == 1;
2305 return DisassembleNLdSt0(MI, Opcode, insn, NumOps, NumOpsAdded,
2306 slice(insn, 21, 21) == 0, DblSpaced, B);
2313 // Qd/Dd imm src(=Qd/Dd)
2314 static bool DisassembleN1RegModImmFrm(MCInst &MI, unsigned Opcode,
2315 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2317 const TargetInstrDesc &TID = ARMInsts[Opcode];
2318 const TargetOperandInfo *OpInfo = TID.OpInfo;
2320 assert(NumOps >= 2 &&
2321 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2322 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2323 (OpInfo[1].RegClass < 0) &&
2324 "Expect 1 reg operand followed by 1 imm operand");
2326 // Qd/Dd = Inst{22:15-12} => NEON Rd
2327 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[0].RegClass,
2328 decodeNEONRd(insn))));
2330 ElemSize esize = ESizeNA;
2333 case ARM::VMOVv16i8:
2336 case ARM::VMOVv4i16:
2337 case ARM::VMOVv8i16:
2338 case ARM::VMVNv4i16:
2339 case ARM::VMVNv8i16:
2340 case ARM::VBICiv4i16:
2341 case ARM::VBICiv8i16:
2342 case ARM::VORRiv4i16:
2343 case ARM::VORRiv8i16:
2346 case ARM::VMOVv2i32:
2347 case ARM::VMOVv4i32:
2348 case ARM::VMVNv2i32:
2349 case ARM::VMVNv4i32:
2350 case ARM::VBICiv2i32:
2351 case ARM::VBICiv4i32:
2352 case ARM::VORRiv2i32:
2353 case ARM::VORRiv4i32:
2356 case ARM::VMOVv1i64:
2357 case ARM::VMOVv2i64:
2361 assert(0 && "Unexpected opcode!");
2365 // One register and a modified immediate value.
2366 // Add the imm operand.
2367 MI.addOperand(MCOperand::CreateImm(decodeN1VImm(insn, esize)));
2371 // VBIC/VORRiv*i* variants have an extra $src = $Vd to be filled in.
2373 (OpInfo[2].RegClass == ARM::DPRRegClassID ||
2374 OpInfo[2].RegClass == ARM::QPRRegClassID)) {
2375 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[0].RegClass,
2376 decodeNEONRd(insn))));
2387 N2V_VectorConvert_Between_Float_Fixed
2389 } // End of unnamed namespace
2391 // Vector Convert [between floating-point and fixed-point]
2392 // Qd/Dd Qm/Dm [fbits]
2394 // Vector Duplicate Lane (from scalar to all elements) Instructions.
2395 // VDUPLN16d, VDUPLN16q, VDUPLN32d, VDUPLN32q, VDUPLN8d, VDUPLN8q:
2398 // Vector Move Long:
2401 // Vector Move Narrow:
2405 static bool DisassembleNVdVmOptImm(MCInst &MI, unsigned Opc, uint32_t insn,
2406 unsigned short NumOps, unsigned &NumOpsAdded, N2VFlag Flag, BO B) {
2408 const TargetInstrDesc &TID = ARMInsts[Opc];
2409 const TargetOperandInfo *OpInfo = TID.OpInfo;
2411 assert(NumOps >= 2 &&
2412 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2413 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2414 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2415 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2416 "Expect >= 2 operands and first 2 as reg operands");
2418 unsigned &OpIdx = NumOpsAdded;
2422 ElemSize esize = ESizeNA;
2423 if (Flag == N2V_VectorDupLane) {
2424 // VDUPLN has its index embedded. Its size can be inferred from the Opcode.
2425 assert(Opc >= ARM::VDUPLN16d && Opc <= ARM::VDUPLN8q &&
2426 "Unexpected Opcode");
2427 esize = (Opc == ARM::VDUPLN8d || Opc == ARM::VDUPLN8q) ? ESize8
2428 : ((Opc == ARM::VDUPLN16d || Opc == ARM::VDUPLN16q) ? ESize16
2432 // Qd/Dd = Inst{22:15-12} => NEON Rd
2433 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2434 decodeNEONRd(insn))));
2438 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2440 MI.addOperand(MCOperand::CreateReg(0));
2444 // Dm = Inst{5:3-0} => NEON Rm
2445 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2446 decodeNEONRm(insn))));
2449 // VZIP and others have two TIED_TO reg operands.
2451 while (OpIdx < NumOps &&
2452 (Idx = TID.getOperandConstraint(OpIdx, TOI::TIED_TO)) != -1) {
2453 // Add TIED_TO operand.
2454 MI.addOperand(MI.getOperand(Idx));
2458 // Add the imm operand, if required.
2459 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2460 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2462 unsigned imm = 0xFFFFFFFF;
2464 if (Flag == N2V_VectorDupLane)
2465 imm = decodeNVLaneDupIndex(insn, esize);
2466 if (Flag == N2V_VectorConvert_Between_Float_Fixed)
2467 imm = decodeVCVTFractionBits(insn);
2469 assert(imm != 0xFFFFFFFF && "Internal error");
2470 MI.addOperand(MCOperand::CreateImm(imm));
2477 static bool DisassembleN2RegFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2478 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2480 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2483 static bool DisassembleNVCVTFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2484 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2486 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2487 N2V_VectorConvert_Between_Float_Fixed, B);
2489 static bool DisassembleNVecDupLnFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2490 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2492 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2493 N2V_VectorDupLane, B);
2496 // Vector Shift [Accumulate] Instructions.
2497 // Qd/Dd [Qd/Dd (TIED_TO)] Qm/Dm ShiftAmt
2499 // Vector Shift Left Long (with maximum shift count) Instructions.
2500 // VSHLLi16, VSHLLi32, VSHLLi8: Qd Dm imm (== size)
2502 static bool DisassembleNVectorShift(MCInst &MI, unsigned Opcode, uint32_t insn,
2503 unsigned short NumOps, unsigned &NumOpsAdded, bool LeftShift, BO B) {
2505 const TargetInstrDesc &TID = ARMInsts[Opcode];
2506 const TargetOperandInfo *OpInfo = TID.OpInfo;
2508 assert(NumOps >= 3 &&
2509 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2510 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2511 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2512 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2513 "Expect >= 3 operands and first 2 as reg operands");
2515 unsigned &OpIdx = NumOpsAdded;
2519 // Qd/Dd = Inst{22:15-12} => NEON Rd
2520 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2521 decodeNEONRd(insn))));
2524 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2526 MI.addOperand(MCOperand::CreateReg(0));
2530 assert((OpInfo[OpIdx].RegClass == ARM::DPRRegClassID ||
2531 OpInfo[OpIdx].RegClass == ARM::QPRRegClassID) &&
2532 "Reg operand expected");
2534 // Qm/Dm = Inst{5:3-0} => NEON Rm
2535 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2536 decodeNEONRm(insn))));
2539 assert(OpInfo[OpIdx].RegClass < 0 && "Imm operand expected");
2541 // Add the imm operand.
2543 // VSHLL has maximum shift count as the imm, inferred from its size.
2547 Imm = decodeNVSAmt(insn, LeftShift);
2559 MI.addOperand(MCOperand::CreateImm(Imm));
2565 // Left shift instructions.
2566 static bool DisassembleN2RegVecShLFrm(MCInst &MI, unsigned Opcode,
2567 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2569 return DisassembleNVectorShift(MI, Opcode, insn, NumOps, NumOpsAdded, true,
2572 // Right shift instructions have different shift amount interpretation.
2573 static bool DisassembleN2RegVecShRFrm(MCInst &MI, unsigned Opcode,
2574 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2576 return DisassembleNVectorShift(MI, Opcode, insn, NumOps, NumOpsAdded, false,
2585 N3V_Multiply_By_Scalar
2587 } // End of unnamed namespace
2589 // NEON Three Register Instructions with Optional Immediate Operand
2591 // Vector Extract Instructions.
2592 // Qd/Dd Qn/Dn Qm/Dm imm4
2594 // Vector Shift (Register) Instructions.
2595 // Qd/Dd Qm/Dm Qn/Dn (notice the order of m, n)
2597 // Vector Multiply [Accumulate/Subtract] [Long] By Scalar Instructions.
2598 // Qd/Dd Qn/Dn RestrictedDm index
2601 static bool DisassembleNVdVnVmOptImm(MCInst &MI, unsigned Opcode, uint32_t insn,
2602 unsigned short NumOps, unsigned &NumOpsAdded, N3VFlag Flag, BO B) {
2604 const TargetInstrDesc &TID = ARMInsts[Opcode];
2605 const TargetOperandInfo *OpInfo = TID.OpInfo;
2607 // No checking for OpInfo[2] because of MOVDneon/MOVQ with only two regs.
2608 assert(NumOps >= 3 &&
2609 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2610 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2611 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2612 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2613 "Expect >= 3 operands and first 2 as reg operands");
2615 unsigned &OpIdx = NumOpsAdded;
2619 bool VdVnVm = Flag == N3V_VectorShift ? false : true;
2620 bool IsImm4 = Flag == N3V_VectorExtract ? true : false;
2621 bool IsDmRestricted = Flag == N3V_Multiply_By_Scalar ? true : false;
2622 ElemSize esize = ESizeNA;
2623 if (Flag == N3V_Multiply_By_Scalar) {
2624 unsigned size = (insn >> 20) & 3;
2625 if (size == 1) esize = ESize16;
2626 if (size == 2) esize = ESize32;
2627 assert (esize == ESize16 || esize == ESize32);
2630 // Qd/Dd = Inst{22:15-12} => NEON Rd
2631 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2632 decodeNEONRd(insn))));
2635 // VABA, VABAL, VBSLd, VBSLq, ...
2636 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2638 MI.addOperand(MCOperand::CreateReg(0));
2642 // Dn = Inst{7:19-16} => NEON Rn
2644 // Dm = Inst{5:3-0} => NEON Rm
2645 MI.addOperand(MCOperand::CreateReg(
2646 getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2647 VdVnVm ? decodeNEONRn(insn)
2648 : decodeNEONRm(insn))));
2651 // Special case handling for VMOVDneon and VMOVQ because they are marked as
2653 if (Opcode == ARM::VMOVDneon || Opcode == ARM::VMOVQ)
2656 // Dm = Inst{5:3-0} => NEON Rm
2658 // Dm is restricted to D0-D7 if size is 16, D0-D15 otherwise
2660 // Dn = Inst{7:19-16} => NEON Rn
2661 unsigned m = VdVnVm ? (IsDmRestricted ? decodeRestrictedDm(insn, esize)
2662 : decodeNEONRm(insn))
2663 : decodeNEONRn(insn);
2665 MI.addOperand(MCOperand::CreateReg(
2666 getRegisterEnum(B, OpInfo[OpIdx].RegClass, m)));
2669 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2670 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2671 // Add the imm operand.
2674 Imm = decodeN3VImm(insn);
2675 else if (IsDmRestricted)
2676 Imm = decodeRestrictedDmIndex(insn, esize);
2678 assert(0 && "Internal error: unreachable code!");
2682 MI.addOperand(MCOperand::CreateImm(Imm));
2689 static bool DisassembleN3RegFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2690 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2692 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2695 static bool DisassembleN3RegVecShFrm(MCInst &MI, unsigned Opcode,
2696 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2698 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2699 N3V_VectorShift, B);
2701 static bool DisassembleNVecExtractFrm(MCInst &MI, unsigned Opcode,
2702 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2704 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2705 N3V_VectorExtract, B);
2707 static bool DisassembleNVecMulScalarFrm(MCInst &MI, unsigned Opcode,
2708 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2710 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2711 N3V_Multiply_By_Scalar, B);
2714 // Vector Table Lookup
2716 // VTBL1, VTBX1: Dd [Dd(TIED_TO)] Dn Dm
2717 // VTBL2, VTBX2: Dd [Dd(TIED_TO)] Dn Dn+1 Dm
2718 // VTBL3, VTBX3: Dd [Dd(TIED_TO)] Dn Dn+1 Dn+2 Dm
2719 // VTBL4, VTBX4: Dd [Dd(TIED_TO)] Dn Dn+1 Dn+2 Dn+3 Dm
2720 static bool DisassembleNVTBLFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2721 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2723 const TargetInstrDesc &TID = ARMInsts[Opcode];
2724 const TargetOperandInfo *OpInfo = TID.OpInfo;
2725 if (!OpInfo) return false;
2727 assert(NumOps >= 3 &&
2728 OpInfo[0].RegClass == ARM::DPRRegClassID &&
2729 OpInfo[1].RegClass == ARM::DPRRegClassID &&
2730 OpInfo[2].RegClass == ARM::DPRRegClassID &&
2731 "Expect >= 3 operands and first 3 as reg operands");
2733 unsigned &OpIdx = NumOpsAdded;
2737 unsigned Rn = decodeNEONRn(insn);
2739 // {Dn} encoded as len = 0b00
2740 // {Dn Dn+1} encoded as len = 0b01
2741 // {Dn Dn+1 Dn+2 } encoded as len = 0b10
2742 // {Dn Dn+1 Dn+2 Dn+3} encoded as len = 0b11
2743 unsigned Len = slice(insn, 9, 8) + 1;
2745 // Dd (the destination vector)
2746 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2747 decodeNEONRd(insn))));
2750 // Process tied_to operand constraint.
2752 if ((Idx = TID.getOperandConstraint(OpIdx, TOI::TIED_TO)) != -1) {
2753 MI.addOperand(MI.getOperand(Idx));
2757 // Do the <list> now.
2758 for (unsigned i = 0; i < Len; ++i) {
2759 assert(OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::DPRRegClassID &&
2760 "Reg operand expected");
2761 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2766 // Dm (the index vector)
2767 assert(OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::DPRRegClassID &&
2768 "Reg operand (index vector) expected");
2769 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2770 decodeNEONRm(insn))));
2776 // Vector Get Lane (move scalar to ARM core register) Instructions.
2777 // VGETLNi32, VGETLNs16, VGETLNs8, VGETLNu16, VGETLNu8: Rt Dn index
2778 static bool DisassembleNGetLnFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2779 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2781 const TargetInstrDesc &TID = ARMInsts[Opcode];
2782 const TargetOperandInfo *OpInfo = TID.OpInfo;
2783 if (!OpInfo) return false;
2785 assert(TID.getNumDefs() == 1 && NumOps >= 3 &&
2786 OpInfo[0].RegClass == ARM::GPRRegClassID &&
2787 OpInfo[1].RegClass == ARM::DPRRegClassID &&
2788 OpInfo[2].RegClass < 0 &&
2789 "Expect >= 3 operands with one dst operand");
2792 Opcode == ARM::VGETLNi32 ? ESize32
2793 : ((Opcode == ARM::VGETLNs16 || Opcode == ARM::VGETLNu16) ? ESize16
2796 // Rt = Inst{15-12} => ARM Rd
2797 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2800 // Dn = Inst{7:19-16} => NEON Rn
2801 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2802 decodeNEONRn(insn))));
2804 MI.addOperand(MCOperand::CreateImm(decodeNVLaneOpIndex(insn, esize)));
2810 // Vector Set Lane (move ARM core register to scalar) Instructions.
2811 // VSETLNi16, VSETLNi32, VSETLNi8: Dd Dd (TIED_TO) Rt index
2812 static bool DisassembleNSetLnFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2813 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2815 const TargetInstrDesc &TID = ARMInsts[Opcode];
2816 const TargetOperandInfo *OpInfo = TID.OpInfo;
2817 if (!OpInfo) return false;
2819 assert(TID.getNumDefs() == 1 && NumOps >= 3 &&
2820 OpInfo[0].RegClass == ARM::DPRRegClassID &&
2821 OpInfo[1].RegClass == ARM::DPRRegClassID &&
2822 TID.getOperandConstraint(1, TOI::TIED_TO) != -1 &&
2823 OpInfo[2].RegClass == ARM::GPRRegClassID &&
2824 OpInfo[3].RegClass < 0 &&
2825 "Expect >= 3 operands with one dst operand");
2828 Opcode == ARM::VSETLNi8 ? ESize8
2829 : (Opcode == ARM::VSETLNi16 ? ESize16
2832 // Dd = Inst{7:19-16} => NEON Rn
2833 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2834 decodeNEONRn(insn))));
2837 MI.addOperand(MCOperand::CreateReg(0));
2839 // Rt = Inst{15-12} => ARM Rd
2840 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2843 MI.addOperand(MCOperand::CreateImm(decodeNVLaneOpIndex(insn, esize)));
2849 // Vector Duplicate Instructions (from ARM core register to all elements).
2850 // VDUP8d, VDUP16d, VDUP32d, VDUP8q, VDUP16q, VDUP32q: Qd/Dd Rt
2851 static bool DisassembleNDupFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2852 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2854 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
2856 assert(NumOps >= 2 &&
2857 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2858 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2859 OpInfo[1].RegClass == ARM::GPRRegClassID &&
2860 "Expect >= 2 operands and first 2 as reg operand");
2862 unsigned RegClass = OpInfo[0].RegClass;
2864 // Qd/Dd = Inst{7:19-16} => NEON Rn
2865 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClass,
2866 decodeNEONRn(insn))));
2868 // Rt = Inst{15-12} => ARM Rd
2869 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2879 static inline bool MemBarrierInstr(uint32_t insn) {
2880 unsigned op7_4 = slice(insn, 7, 4);
2881 if (slice(insn, 31, 8) == 0xf57ff0 && (op7_4 >= 4 && op7_4 <= 6))
2887 static inline bool PreLoadOpcode(unsigned Opcode) {
2889 case ARM::PLDi12: case ARM::PLDrs:
2890 case ARM::PLDWi12: case ARM::PLDWrs:
2891 case ARM::PLIi12: case ARM::PLIrs:
2898 static bool DisassemblePreLoadFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2899 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2901 // Preload Data/Instruction requires either 2 or 3 operands.
2902 // PLDi12, PLDWi12, PLIi12: addrmode_imm12
2903 // PLDrs, PLDWrs, PLIrs: ldst_so_reg
2905 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2908 if (Opcode == ARM::PLDi12 || Opcode == ARM::PLDWi12
2909 || Opcode == ARM::PLIi12) {
2910 unsigned Imm12 = slice(insn, 11, 0);
2911 bool Negative = getUBit(insn) == 0;
2913 // A8.6.118 PLD (literal) PLDWi12 with Rn=PC is transformed to PLDi12.
2914 if (Opcode == ARM::PLDWi12 && slice(insn, 19, 16) == 0xF) {
2915 DEBUG(errs() << "Rn == '1111': PLDWi12 morphed to PLDi12\n");
2916 MI.setOpcode(ARM::PLDi12);
2919 // -0 is represented specially. All other values are as normal.
2920 int Offset = Negative ? -1 * Imm12 : Imm12;
2921 if (Imm12 == 0 && Negative)
2924 MI.addOperand(MCOperand::CreateImm(Offset));
2927 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2930 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
2932 // Inst{6-5} encodes the shift opcode.
2933 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
2934 // Inst{11-7} encodes the imm5 shift amount.
2935 unsigned ShImm = slice(insn, 11, 7);
2937 // A8.4.1. Possible rrx or shift amount of 32...
2938 getImmShiftSE(ShOp, ShImm);
2939 MI.addOperand(MCOperand::CreateImm(
2940 ARM_AM::getAM2Opc(AddrOpcode, ShImm, ShOp)));
2947 static bool DisassembleMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2948 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2950 if (MemBarrierInstr(insn)) {
2951 // DMBsy, DSBsy, and ISBsy instructions have zero operand and are taken care
2952 // of within the generic ARMBasicMCBuilder::BuildIt() method.
2954 // Inst{3-0} encodes the memory barrier option for the variants.
2955 MI.addOperand(MCOperand::CreateImm(slice(insn, 3, 0)));
2971 // SWP, SWPB: Rd Rm Rn
2972 // Delegate to DisassembleLdStExFrm()....
2973 return DisassembleLdStExFrm(MI, Opcode, insn, NumOps, NumOpsAdded, B);
2978 if (Opcode == ARM::SETEND) {
2980 MI.addOperand(MCOperand::CreateImm(slice(insn, 9, 9)));
2984 // FIXME: To enable correct asm parsing and disasm of CPS we need 3 different
2985 // opcodes which match the same real instruction. This is needed since there's
2986 // no current handling of optional arguments. Fix here when a better handling
2987 // of optional arguments is implemented.
2988 if (Opcode == ARM::CPS3p) { // M = 1
2989 // Let's reject these impossible imod values by returning false:
2992 // AsmPrinter cannot handle imod=0b00, plus (imod=0b00,M=1,iflags!=0) is an
2993 // invalid combination, so we just check for imod=0b00 here.
2994 if (slice(insn, 19, 18) == 0 || slice(insn, 19, 18) == 1)
2996 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 18))); // imod
2997 MI.addOperand(MCOperand::CreateImm(slice(insn, 8, 6))); // iflags
2998 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0))); // mode
3002 if (Opcode == ARM::CPS2p) { // mode = 0, M = 0
3003 // Let's reject these impossible imod values by returning false:
3004 // 1. (imod=0b00,M=0)
3006 if (slice(insn, 19, 18) == 0 || slice(insn, 19, 18) == 1)
3008 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 18))); // imod
3009 MI.addOperand(MCOperand::CreateImm(slice(insn, 8, 6))); // iflags
3013 if (Opcode == ARM::CPS1p) { // imod = 0, iflags = 0, M = 1
3014 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0))); // mode
3019 // DBG has its option specified in Inst{3-0}.
3020 if (Opcode == ARM::DBG) {
3021 MI.addOperand(MCOperand::CreateImm(slice(insn, 3, 0)));
3026 // BKPT takes an imm32 val equal to ZeroExtend(Inst{19-8:3-0}).
3027 if (Opcode == ARM::BKPT) {
3028 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 8) << 4 |
3029 slice(insn, 3, 0)));
3034 if (PreLoadOpcode(Opcode))
3035 return DisassemblePreLoadFrm(MI, Opcode, insn, NumOps, NumOpsAdded, B);
3037 assert(0 && "Unexpected misc instruction!");
3041 /// FuncPtrs - FuncPtrs maps ARMFormat to its corresponding DisassembleFP.
3042 /// We divide the disassembly task into different categories, with each one
3043 /// corresponding to a specific instruction encoding format. There could be
3044 /// exceptions when handling a specific format, and that is why the Opcode is
3045 /// also present in the function prototype.
3046 static const DisassembleFP FuncPtrs[] = {
3050 &DisassembleBrMiscFrm,
3052 &DisassembleDPSoRegFrm,
3055 &DisassembleLdMiscFrm,
3056 &DisassembleStMiscFrm,
3057 &DisassembleLdStMulFrm,
3058 &DisassembleLdStExFrm,
3059 &DisassembleArithMiscFrm,
3062 &DisassembleVFPUnaryFrm,
3063 &DisassembleVFPBinaryFrm,
3064 &DisassembleVFPConv1Frm,
3065 &DisassembleVFPConv2Frm,
3066 &DisassembleVFPConv3Frm,
3067 &DisassembleVFPConv4Frm,
3068 &DisassembleVFPConv5Frm,
3069 &DisassembleVFPLdStFrm,
3070 &DisassembleVFPLdStMulFrm,
3071 &DisassembleVFPMiscFrm,
3072 &DisassembleThumbFrm,
3073 &DisassembleMiscFrm,
3074 &DisassembleNGetLnFrm,
3075 &DisassembleNSetLnFrm,
3076 &DisassembleNDupFrm,
3078 // VLD and VST (including one lane) Instructions.
3081 // A7.4.6 One register and a modified immediate value
3082 // 1-Register Instructions with imm.
3083 // LLVM only defines VMOVv instructions.
3084 &DisassembleN1RegModImmFrm,
3086 // 2-Register Instructions with no imm.
3087 &DisassembleN2RegFrm,
3089 // 2-Register Instructions with imm (vector convert float/fixed point).
3090 &DisassembleNVCVTFrm,
3092 // 2-Register Instructions with imm (vector dup lane).
3093 &DisassembleNVecDupLnFrm,
3095 // Vector Shift Left Instructions.
3096 &DisassembleN2RegVecShLFrm,
3098 // Vector Shift Righ Instructions, which has different interpretation of the
3099 // shift amount from the imm6 field.
3100 &DisassembleN2RegVecShRFrm,
3102 // 3-Register Data-Processing Instructions.
3103 &DisassembleN3RegFrm,
3105 // Vector Shift (Register) Instructions.
3106 // D:Vd M:Vm N:Vn (notice that M:Vm is the first operand)
3107 &DisassembleN3RegVecShFrm,
3109 // Vector Extract Instructions.
3110 &DisassembleNVecExtractFrm,
3112 // Vector [Saturating Rounding Doubling] Multiply [Accumulate/Subtract] [Long]
3113 // By Scalar Instructions.
3114 &DisassembleNVecMulScalarFrm,
3116 // Vector Table Lookup uses byte indexes in a control vector to look up byte
3117 // values in a table and generate a new vector.
3118 &DisassembleNVTBLFrm,
3123 /// BuildIt - BuildIt performs the build step for this ARM Basic MC Builder.
3124 /// The general idea is to set the Opcode for the MCInst, followed by adding
3125 /// the appropriate MCOperands to the MCInst. ARM Basic MC Builder delegates
3126 /// to the Format-specific disassemble function for disassembly, followed by
3127 /// TryPredicateAndSBitModifier() to do PredicateOperand and OptionalDefOperand
3128 /// which follow the Dst/Src Operands.
3129 bool ARMBasicMCBuilder::BuildIt(MCInst &MI, uint32_t insn) {
3130 // Stage 1 sets the Opcode.
3131 MI.setOpcode(Opcode);
3132 // If the number of operands is zero, we're done!
3136 // Stage 2 calls the format-specific disassemble function to build the operand
3140 unsigned NumOpsAdded = 0;
3141 bool OK = (*Disasm)(MI, Opcode, insn, NumOps, NumOpsAdded, this);
3143 if (!OK || this->Err != 0) return false;
3144 if (NumOpsAdded >= NumOps)
3147 // Stage 3 deals with operands unaccounted for after stage 2 is finished.
3148 // FIXME: Should this be done selectively?
3149 return TryPredicateAndSBitModifier(MI, Opcode, insn, NumOps - NumOpsAdded);
3152 // A8.3 Conditional execution
3153 // A8.3.1 Pseudocode details of conditional execution
3154 // Condition bits '111x' indicate the instruction is always executed.
3155 static uint32_t CondCode(uint32_t CondField) {
3156 if (CondField == 0xF)
3161 /// DoPredicateOperands - DoPredicateOperands process the predicate operands
3162 /// of some Thumb instructions which come before the reglist operands. It
3163 /// returns true if the two predicate operands have been processed.
3164 bool ARMBasicMCBuilder::DoPredicateOperands(MCInst& MI, unsigned Opcode,
3165 uint32_t /* insn */, unsigned short NumOpsRemaining) {
3167 assert(NumOpsRemaining > 0 && "Invalid argument");
3169 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3170 unsigned Idx = MI.getNumOperands();
3172 // First, we check whether this instr specifies the PredicateOperand through
3173 // a pair of TargetOperandInfos with isPredicate() property.
3174 if (NumOpsRemaining >= 2 &&
3175 OpInfo[Idx].isPredicate() && OpInfo[Idx+1].isPredicate() &&
3176 OpInfo[Idx].RegClass < 0 &&
3177 OpInfo[Idx+1].RegClass == ARM::CCRRegClassID)
3179 // If we are inside an IT block, get the IT condition bits maintained via
3180 // ARMBasicMCBuilder::ITState[7:0], through ARMBasicMCBuilder::GetITCond().
3183 MI.addOperand(MCOperand::CreateImm(GetITCond()));
3185 MI.addOperand(MCOperand::CreateImm(ARMCC::AL));
3186 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
3193 /// TryPredicateAndSBitModifier - TryPredicateAndSBitModifier tries to process
3194 /// the possible Predicate and SBitModifier, to build the remaining MCOperand
3196 bool ARMBasicMCBuilder::TryPredicateAndSBitModifier(MCInst& MI, unsigned Opcode,
3197 uint32_t insn, unsigned short NumOpsRemaining) {
3199 assert(NumOpsRemaining > 0 && "Invalid argument");
3201 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3202 const std::string &Name = ARMInsts[Opcode].Name;
3203 unsigned Idx = MI.getNumOperands();
3205 // First, we check whether this instr specifies the PredicateOperand through
3206 // a pair of TargetOperandInfos with isPredicate() property.
3207 if (NumOpsRemaining >= 2 &&
3208 OpInfo[Idx].isPredicate() && OpInfo[Idx+1].isPredicate() &&
3209 OpInfo[Idx].RegClass < 0 &&
3210 OpInfo[Idx+1].RegClass == ARM::CCRRegClassID)
3212 // If we are inside an IT block, get the IT condition bits maintained via
3213 // ARMBasicMCBuilder::ITState[7:0], through ARMBasicMCBuilder::GetITCond().
3216 MI.addOperand(MCOperand::CreateImm(GetITCond()));
3218 if (Name.length() > 1 && Name[0] == 't') {
3219 // Thumb conditional branch instructions have their cond field embedded,
3223 if (Name == "t2Bcc")
3224 MI.addOperand(MCOperand::CreateImm(CondCode(slice(insn, 25, 22))));
3225 else if (Name == "tBcc")
3226 MI.addOperand(MCOperand::CreateImm(CondCode(slice(insn, 11, 8))));
3228 MI.addOperand(MCOperand::CreateImm(ARMCC::AL));
3230 // ARM instructions get their condition field from Inst{31-28}.
3231 MI.addOperand(MCOperand::CreateImm(CondCode(getCondField(insn))));
3234 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
3236 NumOpsRemaining -= 2;
3239 if (NumOpsRemaining == 0)
3242 // Next, if OptionalDefOperand exists, we check whether the 'S' bit is set.
3243 if (OpInfo[Idx].isOptionalDef() && OpInfo[Idx].RegClass==ARM::CCRRegClassID) {
3244 MI.addOperand(MCOperand::CreateReg(getSBit(insn) == 1 ? ARM::CPSR : 0));
3248 if (NumOpsRemaining == 0)
3254 /// RunBuildAfterHook - RunBuildAfterHook performs operations deemed necessary
3255 /// after BuildIt is finished.
3256 bool ARMBasicMCBuilder::RunBuildAfterHook(bool Status, MCInst &MI,
3259 if (!SP) return Status;
3261 if (Opcode == ARM::t2IT)
3262 Status = SP->InitIT(slice(insn, 7, 0)) ? Status : false;
3263 else if (InITBlock())
3269 /// Opcode, Format, and NumOperands make up an ARM Basic MCBuilder.
3270 ARMBasicMCBuilder::ARMBasicMCBuilder(unsigned opc, ARMFormat format,
3272 : Opcode(opc), Format(format), NumOps(num), SP(0), Err(0) {
3273 unsigned Idx = (unsigned)format;
3274 assert(Idx < (array_lengthof(FuncPtrs) - 1) && "Unknown format");
3275 Disasm = FuncPtrs[Idx];
3278 /// CreateMCBuilder - Return an ARMBasicMCBuilder that can build up the MC
3279 /// infrastructure of an MCInst given the Opcode and Format of the instr.
3280 /// Return NULL if it fails to create/return a proper builder. API clients
3281 /// are responsible for freeing up of the allocated memory. Cacheing can be
3282 /// performed by the API clients to improve performance.
3283 ARMBasicMCBuilder *llvm::CreateMCBuilder(unsigned Opcode, ARMFormat Format) {
3284 // For "Unknown format", fail by returning a NULL pointer.
3285 if ((unsigned)Format >= (array_lengthof(FuncPtrs) - 1)) {
3286 DEBUG(errs() << "Unknown format\n");
3290 return new ARMBasicMCBuilder(Opcode, Format,
3291 ARMInsts[Opcode].getNumOperands());