1 //===- ARMDisassemblerCore.cpp - ARM disassembler helpers -------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file is part of the ARM Disassembler.
11 // It contains code to represent the core concepts of Builder and DisassembleFP
12 // to solve the problem of disassembling an ARM instr.
14 //===----------------------------------------------------------------------===//
16 #define DEBUG_TYPE "arm-disassembler"
18 #include "ARMDisassemblerCore.h"
19 #include "ARMAddressingModes.h"
20 #include "llvm/Support/Debug.h"
21 #include "llvm/Support/raw_ostream.h"
23 //#define DEBUG(X) do { X; } while (0)
25 /// ARMGenInstrInfo.inc - ARMGenInstrInfo.inc contains the static const
26 /// TargetInstrDesc ARMInsts[] definition and the TargetOperandInfo[]'s
27 /// describing the operand info for each ARMInsts[i].
29 /// Together with an instruction's encoding format, we can take advantage of the
30 /// NumOperands and the OpInfo fields of the target instruction description in
31 /// the quest to build out the MCOperand list for an MCInst.
33 /// The general guideline is that with a known format, the number of dst and src
34 /// operands are well-known. The dst is built first, followed by the src
35 /// operand(s). The operands not yet used at this point are for the Implicit
36 /// Uses and Defs by this instr. For the Uses part, the pred:$p operand is
37 /// defined with two components:
39 /// def pred { // Operand PredicateOperand
40 /// ValueType Type = OtherVT;
41 /// string PrintMethod = "printPredicateOperand";
42 /// string AsmOperandLowerMethod = ?;
43 /// dag MIOperandInfo = (ops i32imm, CCR);
44 /// AsmOperandClass ParserMatchClass = ImmAsmOperand;
45 /// dag DefaultOps = (ops (i32 14), (i32 zero_reg));
48 /// which is manifested by the TargetOperandInfo[] of:
50 /// { 0, 0|(1<<TOI::Predicate), 0 },
51 /// { ARM::CCRRegClassID, 0|(1<<TOI::Predicate), 0 }
53 /// So the first predicate MCOperand corresponds to the immediate part of the
54 /// ARM condition field (Inst{31-28}), and the second predicate MCOperand
55 /// corresponds to a register kind of ARM::CPSR.
57 /// For the Defs part, in the simple case of only cc_out:$s, we have:
59 /// def cc_out { // Operand OptionalDefOperand
60 /// ValueType Type = OtherVT;
61 /// string PrintMethod = "printSBitModifierOperand";
62 /// string AsmOperandLowerMethod = ?;
63 /// dag MIOperandInfo = (ops CCR);
64 /// AsmOperandClass ParserMatchClass = ImmAsmOperand;
65 /// dag DefaultOps = (ops (i32 zero_reg));
68 /// which is manifested by the one TargetOperandInfo of:
70 /// { ARM::CCRRegClassID, 0|(1<<TOI::OptionalDef), 0 }
72 /// And this maps to one MCOperand with the regsiter kind of ARM::CPSR.
73 #include "ARMGenInstrInfo.inc"
77 const char *ARMUtils::OpcodeName(unsigned Opcode) {
78 return ARMInsts[Opcode].Name;
81 // Return the register enum Based on RegClass and the raw register number.
84 getRegisterEnum(BO B, unsigned RegClassID, unsigned RawRegister) {
85 // For this purpose, we can treat rGPR as if it were GPR.
86 if (RegClassID == ARM::rGPRRegClassID) RegClassID = ARM::GPRRegClassID;
88 // See also decodeNEONRd(), decodeNEONRn(), decodeNEONRm().
90 RegClassID == ARM::QPRRegClassID ? RawRegister >> 1 : RawRegister;
97 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R0;
98 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
99 case ARM::DPR_VFP2RegClassID:
101 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
102 case ARM::QPR_VFP2RegClassID:
104 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S0;
108 switch (RegClassID) {
109 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R1;
110 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
111 case ARM::DPR_VFP2RegClassID:
113 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
114 case ARM::QPR_VFP2RegClassID:
116 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S1;
120 switch (RegClassID) {
121 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R2;
122 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
123 case ARM::DPR_VFP2RegClassID:
125 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
126 case ARM::QPR_VFP2RegClassID:
128 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S2;
132 switch (RegClassID) {
133 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R3;
134 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
135 case ARM::DPR_VFP2RegClassID:
137 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
138 case ARM::QPR_VFP2RegClassID:
140 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S3;
144 switch (RegClassID) {
145 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R4;
146 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
147 case ARM::DPR_VFP2RegClassID:
149 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q4;
150 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S4;
154 switch (RegClassID) {
155 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R5;
156 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
157 case ARM::DPR_VFP2RegClassID:
159 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q5;
160 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S5;
164 switch (RegClassID) {
165 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R6;
166 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
167 case ARM::DPR_VFP2RegClassID:
169 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q6;
170 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S6;
174 switch (RegClassID) {
175 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R7;
176 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
177 case ARM::DPR_VFP2RegClassID:
179 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q7;
180 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S7;
184 switch (RegClassID) {
185 case ARM::GPRRegClassID: return ARM::R8;
186 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D8;
187 case ARM::QPRRegClassID: return ARM::Q8;
188 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S8;
192 switch (RegClassID) {
193 case ARM::GPRRegClassID: return ARM::R9;
194 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D9;
195 case ARM::QPRRegClassID: return ARM::Q9;
196 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S9;
200 switch (RegClassID) {
201 case ARM::GPRRegClassID: return ARM::R10;
202 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D10;
203 case ARM::QPRRegClassID: return ARM::Q10;
204 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S10;
208 switch (RegClassID) {
209 case ARM::GPRRegClassID: return ARM::R11;
210 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D11;
211 case ARM::QPRRegClassID: return ARM::Q11;
212 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S11;
216 switch (RegClassID) {
217 case ARM::GPRRegClassID: return ARM::R12;
218 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D12;
219 case ARM::QPRRegClassID: return ARM::Q12;
220 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S12;
224 switch (RegClassID) {
225 case ARM::GPRRegClassID: return ARM::SP;
226 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D13;
227 case ARM::QPRRegClassID: return ARM::Q13;
228 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S13;
232 switch (RegClassID) {
233 case ARM::GPRRegClassID: return ARM::LR;
234 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D14;
235 case ARM::QPRRegClassID: return ARM::Q14;
236 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S14;
240 switch (RegClassID) {
241 case ARM::GPRRegClassID: return ARM::PC;
242 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D15;
243 case ARM::QPRRegClassID: return ARM::Q15;
244 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S15;
248 switch (RegClassID) {
249 case ARM::DPRRegClassID: return ARM::D16;
250 case ARM::SPRRegClassID: return ARM::S16;
254 switch (RegClassID) {
255 case ARM::DPRRegClassID: return ARM::D17;
256 case ARM::SPRRegClassID: return ARM::S17;
260 switch (RegClassID) {
261 case ARM::DPRRegClassID: return ARM::D18;
262 case ARM::SPRRegClassID: return ARM::S18;
266 switch (RegClassID) {
267 case ARM::DPRRegClassID: return ARM::D19;
268 case ARM::SPRRegClassID: return ARM::S19;
272 switch (RegClassID) {
273 case ARM::DPRRegClassID: return ARM::D20;
274 case ARM::SPRRegClassID: return ARM::S20;
278 switch (RegClassID) {
279 case ARM::DPRRegClassID: return ARM::D21;
280 case ARM::SPRRegClassID: return ARM::S21;
284 switch (RegClassID) {
285 case ARM::DPRRegClassID: return ARM::D22;
286 case ARM::SPRRegClassID: return ARM::S22;
290 switch (RegClassID) {
291 case ARM::DPRRegClassID: return ARM::D23;
292 case ARM::SPRRegClassID: return ARM::S23;
296 switch (RegClassID) {
297 case ARM::DPRRegClassID: return ARM::D24;
298 case ARM::SPRRegClassID: return ARM::S24;
302 switch (RegClassID) {
303 case ARM::DPRRegClassID: return ARM::D25;
304 case ARM::SPRRegClassID: return ARM::S25;
308 switch (RegClassID) {
309 case ARM::DPRRegClassID: return ARM::D26;
310 case ARM::SPRRegClassID: return ARM::S26;
314 switch (RegClassID) {
315 case ARM::DPRRegClassID: return ARM::D27;
316 case ARM::SPRRegClassID: return ARM::S27;
320 switch (RegClassID) {
321 case ARM::DPRRegClassID: return ARM::D28;
322 case ARM::SPRRegClassID: return ARM::S28;
326 switch (RegClassID) {
327 case ARM::DPRRegClassID: return ARM::D29;
328 case ARM::SPRRegClassID: return ARM::S29;
332 switch (RegClassID) {
333 case ARM::DPRRegClassID: return ARM::D30;
334 case ARM::SPRRegClassID: return ARM::S30;
338 switch (RegClassID) {
339 case ARM::DPRRegClassID: return ARM::D31;
340 case ARM::SPRRegClassID: return ARM::S31;
344 DEBUG(errs() << "Invalid (RegClassID, RawRegister) combination\n");
345 // Encoding error. Mark the builder with error code != 0.
350 ///////////////////////////////
352 // Utility Functions //
354 ///////////////////////////////
356 // Extract/Decode Rd: Inst{15-12}.
357 static inline unsigned decodeRd(uint32_t insn) {
358 return (insn >> ARMII::RegRdShift) & ARMII::GPRRegMask;
361 // Extract/Decode Rn: Inst{19-16}.
362 static inline unsigned decodeRn(uint32_t insn) {
363 return (insn >> ARMII::RegRnShift) & ARMII::GPRRegMask;
366 // Extract/Decode Rm: Inst{3-0}.
367 static inline unsigned decodeRm(uint32_t insn) {
368 return (insn & ARMII::GPRRegMask);
371 // Extract/Decode Rs: Inst{11-8}.
372 static inline unsigned decodeRs(uint32_t insn) {
373 return (insn >> ARMII::RegRsShift) & ARMII::GPRRegMask;
376 static inline unsigned getCondField(uint32_t insn) {
377 return (insn >> ARMII::CondShift);
380 static inline unsigned getIBit(uint32_t insn) {
381 return (insn >> ARMII::I_BitShift) & 1;
384 static inline unsigned getAM3IBit(uint32_t insn) {
385 return (insn >> ARMII::AM3_I_BitShift) & 1;
388 static inline unsigned getPBit(uint32_t insn) {
389 return (insn >> ARMII::P_BitShift) & 1;
392 static inline unsigned getUBit(uint32_t insn) {
393 return (insn >> ARMII::U_BitShift) & 1;
396 static inline unsigned getPUBits(uint32_t insn) {
397 return (insn >> ARMII::U_BitShift) & 3;
400 static inline unsigned getSBit(uint32_t insn) {
401 return (insn >> ARMII::S_BitShift) & 1;
404 static inline unsigned getWBit(uint32_t insn) {
405 return (insn >> ARMII::W_BitShift) & 1;
408 static inline unsigned getDBit(uint32_t insn) {
409 return (insn >> ARMII::D_BitShift) & 1;
412 static inline unsigned getNBit(uint32_t insn) {
413 return (insn >> ARMII::N_BitShift) & 1;
416 static inline unsigned getMBit(uint32_t insn) {
417 return (insn >> ARMII::M_BitShift) & 1;
420 // See A8.4 Shifts applied to a register.
421 // A8.4.2 Register controlled shifts.
423 // getShiftOpcForBits - getShiftOpcForBits translates from the ARM encoding bits
424 // into llvm enums for shift opcode. The API clients should pass in the value
425 // encoded with two bits, so the assert stays to signal a wrong API usage.
427 // A8-12: DecodeRegShift()
428 static inline ARM_AM::ShiftOpc getShiftOpcForBits(unsigned bits) {
430 default: assert(0 && "No such value"); return ARM_AM::no_shift;
431 case 0: return ARM_AM::lsl;
432 case 1: return ARM_AM::lsr;
433 case 2: return ARM_AM::asr;
434 case 3: return ARM_AM::ror;
438 // See A8.4 Shifts applied to a register.
439 // A8.4.1 Constant shifts.
441 // getImmShiftSE - getImmShiftSE translates from the raw ShiftOpc and raw Imm5
442 // encodings into the intended ShiftOpc and shift amount.
444 // A8-11: DecodeImmShift()
445 static inline void getImmShiftSE(ARM_AM::ShiftOpc &ShOp, unsigned &ShImm) {
449 case ARM_AM::no_shift:
453 ShOp = ARM_AM::no_shift;
465 // getAMSubModeForBits - getAMSubModeForBits translates from the ARM encoding
466 // bits Inst{24-23} (P(24) and U(23)) into llvm enums for AMSubMode. The API
467 // clients should pass in the value encoded with two bits, so the assert stays
468 // to signal a wrong API usage.
469 static inline ARM_AM::AMSubMode getAMSubModeForBits(unsigned bits) {
471 default: assert(0 && "No such value"); return ARM_AM::bad_am_submode;
472 case 1: return ARM_AM::ia; // P=0 U=1
473 case 3: return ARM_AM::ib; // P=1 U=1
474 case 0: return ARM_AM::da; // P=0 U=0
475 case 2: return ARM_AM::db; // P=1 U=0
479 ////////////////////////////////////////////
481 // Disassemble function definitions //
483 ////////////////////////////////////////////
485 /// There is a separate Disassemble*Frm function entry for disassembly of an ARM
486 /// instr into a list of MCOperands in the appropriate order, with possible dst,
487 /// followed by possible src(s).
489 /// The processing of the predicate, and the 'S' modifier bit, if MI modifies
490 /// the CPSR, is factored into ARMBasicMCBuilder's method named
491 /// TryPredicateAndSBitModifier.
493 static bool DisassemblePseudo(MCInst &MI, unsigned Opcode, uint32_t insn,
494 unsigned short NumOps, unsigned &NumOpsAdded, BO) {
496 assert(0 && "Unexpected pseudo instruction!");
500 // Multiply Instructions.
501 // MLA, MLS, SMLABB, SMLABT, SMLATB, SMLATT, SMLAWB, SMLAWT, SMMLA, SMMLS:
502 // Rd{19-16} Rn{3-0} Rm{11-8} Ra{15-12}
504 // MUL, SMMUL, SMULBB, SMULBT, SMULTB, SMULTT, SMULWB, SMULWT:
505 // Rd{19-16} Rn{3-0} Rm{11-8}
507 // SMLAL, SMULL, UMAAL, UMLAL, UMULL, SMLALBB, SMLALBT, SMLALTB, SMLALTT:
508 // RdLo{15-12} RdHi{19-16} Rn{3-0} Rm{11-8}
510 // The mapping of the multiply registers to the "regular" ARM registers, where
511 // there are convenience decoder functions, is:
517 static bool DisassembleMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
518 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
520 const TargetInstrDesc &TID = ARMInsts[Opcode];
521 unsigned short NumDefs = TID.getNumDefs();
522 const TargetOperandInfo *OpInfo = TID.OpInfo;
523 unsigned &OpIdx = NumOpsAdded;
527 assert(NumDefs > 0 && "NumDefs should be greater than 0 for MulFrm");
529 && OpInfo[0].RegClass == ARM::GPRRegClassID
530 && OpInfo[1].RegClass == ARM::GPRRegClassID
531 && OpInfo[2].RegClass == ARM::GPRRegClassID
532 && "Expect three register operands");
534 // Instructions with two destination registers have RdLo{15-12} first.
536 assert(NumOps >= 4 && OpInfo[3].RegClass == ARM::GPRRegClassID &&
537 "Expect 4th register operand");
538 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
543 // The destination register: RdHi{19-16} or Rd{19-16}.
544 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
547 // The two src regsiters: Rn{3-0}, then Rm{11-8}.
548 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
550 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
554 // Many multiply instructions (e.g., MLA) have three src registers.
555 // The third register operand is Ra{15-12}.
556 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) {
557 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
565 // Helper routines for disassembly of coprocessor instructions.
567 static bool LdStCopOpcode(unsigned Opcode) {
568 if ((Opcode >= ARM::LDC2L_OFFSET && Opcode <= ARM::LDC_PRE) ||
569 (Opcode >= ARM::STC2L_OFFSET && Opcode <= ARM::STC_PRE))
573 static bool CoprocessorOpcode(unsigned Opcode) {
574 if (LdStCopOpcode(Opcode))
580 case ARM::CDP: case ARM::CDP2:
581 case ARM::MCR: case ARM::MCR2: case ARM::MRC: case ARM::MRC2:
582 case ARM::MCRR: case ARM::MCRR2: case ARM::MRRC: case ARM::MRRC2:
586 static inline unsigned GetCoprocessor(uint32_t insn) {
587 return slice(insn, 11, 8);
589 static inline unsigned GetCopOpc1(uint32_t insn, bool CDP) {
590 return CDP ? slice(insn, 23, 20) : slice(insn, 23, 21);
592 static inline unsigned GetCopOpc2(uint32_t insn) {
593 return slice(insn, 7, 5);
595 static inline unsigned GetCopOpc(uint32_t insn) {
596 return slice(insn, 7, 4);
598 // Most of the operands are in immediate forms, except Rd and Rn, which are ARM
601 // CDP, CDP2: cop opc1 CRd CRn CRm opc2
603 // MCR, MCR2, MRC, MRC2: cop opc1 Rd CRn CRm opc2
605 // MCRR, MCRR2, MRRC, MRRc2: cop opc Rd Rn CRm
607 // LDC_OFFSET, LDC_PRE, LDC_POST: cop CRd Rn R0 [+/-]imm8:00
609 // STC_OFFSET, STC_PRE, STC_POST: cop CRd Rn R0 [+/-]imm8:00
613 // LDC_OPTION: cop CRd Rn imm8
615 // STC_OPTION: cop CRd Rn imm8
618 static bool DisassembleCoprocessor(MCInst &MI, unsigned Opcode, uint32_t insn,
619 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
621 assert(NumOps >= 5 && "Num of operands >= 5 for coprocessor instr");
623 unsigned &OpIdx = NumOpsAdded;
624 bool OneCopOpc = (Opcode == ARM::MCRR || Opcode == ARM::MCRR2 ||
625 Opcode == ARM::MRRC || Opcode == ARM::MRRC2);
626 // CDP/CDP2 has no GPR operand; the opc1 operand is also wider (Inst{23-20}).
627 bool NoGPR = (Opcode == ARM::CDP || Opcode == ARM::CDP2);
628 bool LdStCop = LdStCopOpcode(Opcode);
632 MI.addOperand(MCOperand::CreateImm(GetCoprocessor(insn)));
635 // Unindex if P:W = 0b00 --> _OPTION variant
636 unsigned PW = getPBit(insn) << 1 | getWBit(insn);
638 MI.addOperand(MCOperand::CreateImm(decodeRd(insn)));
640 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
644 MI.addOperand(MCOperand::CreateReg(0));
645 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
646 unsigned Offset = ARM_AM::getAM2Opc(AddrOpcode, slice(insn, 7, 0) << 2,
648 MI.addOperand(MCOperand::CreateImm(Offset));
651 MI.addOperand(MCOperand::CreateImm(slice(insn, 7, 0)));
655 MI.addOperand(MCOperand::CreateImm(OneCopOpc ? GetCopOpc(insn)
656 : GetCopOpc1(insn, NoGPR)));
658 MI.addOperand(NoGPR ? MCOperand::CreateImm(decodeRd(insn))
659 : MCOperand::CreateReg(
660 getRegisterEnum(B, ARM::GPRRegClassID,
663 MI.addOperand(OneCopOpc ? MCOperand::CreateReg(
664 getRegisterEnum(B, ARM::GPRRegClassID,
666 : MCOperand::CreateImm(decodeRn(insn)));
668 MI.addOperand(MCOperand::CreateImm(decodeRm(insn)));
673 MI.addOperand(MCOperand::CreateImm(GetCopOpc2(insn)));
681 // Branch Instructions.
682 // BL: SignExtend(Imm24:'00', 32)
683 // Bcc, BL_pred: SignExtend(Imm24:'00', 32) Pred0 Pred1
684 // SMC: ZeroExtend(imm4, 32)
685 // SVC: ZeroExtend(Imm24, 32)
687 // Various coprocessor instructions are assigned BrFrm arbitrarily.
688 // Delegates to DisassembleCoprocessor() helper function.
691 // MSR/MSRsys: Rm mask=Inst{19-16}
693 // MSRi/MSRsysi: so_imm
694 // SRSW/SRS: ldstm_mode:$amode mode_imm
695 // RFEW/RFE: ldstm_mode:$amode Rn
696 static bool DisassembleBrFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
697 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
699 if (CoprocessorOpcode(Opcode))
700 return DisassembleCoprocessor(MI, Opcode, insn, NumOps, NumOpsAdded, B);
702 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
703 if (!OpInfo) return false;
705 // MRS and MRSsys take one GPR reg Rd.
706 if (Opcode == ARM::MRS || Opcode == ARM::MRSsys) {
707 assert(NumOps >= 1 && OpInfo[0].RegClass == ARM::GPRRegClassID &&
708 "Reg operand expected");
709 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
714 // BXJ takes one GPR reg Rm.
715 if (Opcode == ARM::BXJ) {
716 assert(NumOps >= 1 && OpInfo[0].RegClass == ARM::GPRRegClassID &&
717 "Reg operand expected");
718 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
723 // MSR take a mask, followed by one GPR reg Rm. The mask contains the R Bit in
724 // bit 4, and the special register fields in bits 3-0.
725 if (Opcode == ARM::MSR) {
726 assert(NumOps >= 1 && OpInfo[1].RegClass == ARM::GPRRegClassID &&
727 "Reg operand expected");
728 MI.addOperand(MCOperand::CreateImm(slice(insn, 22, 22) << 4 /* R Bit */ |
729 slice(insn, 19, 16) /* Special Reg */ ));
730 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
735 // MSRi take a mask, followed by one so_imm operand. The mask contains the
736 // R Bit in bit 4, and the special register fields in bits 3-0.
737 if (Opcode == ARM::MSRi) {
738 MI.addOperand(MCOperand::CreateImm(slice(insn, 22, 22) << 4 /* R Bit */ |
739 slice(insn, 19, 16) /* Special Reg */ ));
740 // SOImm is 4-bit rotate amount in bits 11-8 with 8-bit imm in bits 7-0.
741 // A5.2.4 Rotate amount is twice the numeric value of Inst{11-8}.
742 // See also ARMAddressingModes.h: getSOImmValImm() and getSOImmValRot().
743 unsigned Rot = (insn >> ARMII::SoRotImmShift) & 0xF;
744 unsigned Imm = insn & 0xFF;
745 MI.addOperand(MCOperand::CreateImm(ARM_AM::rotr32(Imm, 2*Rot)));
749 if (Opcode == ARM::SRSW || Opcode == ARM::SRS ||
750 Opcode == ARM::RFEW || Opcode == ARM::RFE) {
751 ARM_AM::AMSubMode SubMode = getAMSubModeForBits(getPUBits(insn));
752 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM4ModeImm(SubMode)));
754 if (Opcode == ARM::SRSW || Opcode == ARM::SRS)
755 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0)));
757 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
763 assert((Opcode == ARM::Bcc || Opcode == ARM::BL || Opcode == ARM::BL_pred
764 || Opcode == ARM::SMC || Opcode == ARM::SVC) &&
765 "Unexpected Opcode");
767 assert(NumOps >= 1 && OpInfo[0].RegClass < 0 && "Imm operand expected");
770 if (Opcode == ARM::SMC) {
771 // ZeroExtend(imm4, 32) where imm24 = Inst{3-0}.
772 Imm32 = slice(insn, 3, 0);
773 } else if (Opcode == ARM::SVC) {
774 // ZeroExtend(imm24, 32) where imm24 = Inst{23-0}.
775 Imm32 = slice(insn, 23, 0);
777 // SignExtend(imm24:'00', 32) where imm24 = Inst{23-0}.
778 unsigned Imm26 = slice(insn, 23, 0) << 2;
779 //Imm32 = signextend<signed int, 26>(Imm26);
780 Imm32 = SignExtend32<26>(Imm26);
783 MI.addOperand(MCOperand::CreateImm(Imm32));
789 // Misc. Branch Instructions.
792 static bool DisassembleBrMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
793 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
795 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
796 if (!OpInfo) return false;
798 unsigned &OpIdx = NumOpsAdded;
802 // BX_RET and MOVPCLR have only two predicate operands; do an early return.
803 if (Opcode == ARM::BX_RET || Opcode == ARM::MOVPCLR)
806 // BLX and BX take one GPR reg.
807 if (Opcode == ARM::BLX || Opcode == ARM::BLX_pred ||
809 assert(NumOps >= 1 && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
810 "Reg operand expected");
811 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
817 // BLXi takes imm32 (the PC offset).
818 if (Opcode == ARM::BLXi) {
819 assert(NumOps >= 1 && OpInfo[0].RegClass < 0 && "Imm operand expected");
820 // SignExtend(imm24:H:'0', 32) where imm24 = Inst{23-0} and H = Inst{24}.
821 unsigned Imm26 = slice(insn, 23, 0) << 2 | slice(insn, 24, 24) << 1;
822 int Imm32 = SignExtend32<26>(Imm26);
823 MI.addOperand(MCOperand::CreateImm(Imm32));
831 static inline bool getBFCInvMask(uint32_t insn, uint32_t &mask) {
832 uint32_t lsb = slice(insn, 11, 7);
833 uint32_t msb = slice(insn, 20, 16);
836 DEBUG(errs() << "Encoding error: msb < lsb\n");
840 for (uint32_t i = lsb; i <= msb; ++i)
846 // A major complication is the fact that some of the saturating add/subtract
847 // operations have Rd Rm Rn, instead of the "normal" Rd Rn Rm.
848 // They are QADD, QDADD, QDSUB, and QSUB.
849 static bool DisassembleDPFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
850 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
852 const TargetInstrDesc &TID = ARMInsts[Opcode];
853 unsigned short NumDefs = TID.getNumDefs();
854 bool isUnary = isUnaryDP(TID.TSFlags);
855 const TargetOperandInfo *OpInfo = TID.OpInfo;
856 unsigned &OpIdx = NumOpsAdded;
860 // Disassemble register def if there is one.
861 if (NumDefs && (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID)) {
862 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
867 // Now disassemble the src operands.
871 // Special-case handling of BFC/BFI/SBFX/UBFX.
872 if (Opcode == ARM::BFC || Opcode == ARM::BFI) {
873 MI.addOperand(MCOperand::CreateReg(0));
874 if (Opcode == ARM::BFI) {
875 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
880 if (!getBFCInvMask(insn, mask))
883 MI.addOperand(MCOperand::CreateImm(mask));
887 if (Opcode == ARM::SBFX || Opcode == ARM::UBFX) {
888 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
890 MI.addOperand(MCOperand::CreateImm(slice(insn, 11, 7)));
891 MI.addOperand(MCOperand::CreateImm(slice(insn, 20, 16) + 1));
896 bool RmRn = (Opcode == ARM::QADD || Opcode == ARM::QDADD ||
897 Opcode == ARM::QDSUB || Opcode == ARM::QSUB);
899 // BinaryDP has an Rn operand.
901 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
902 "Reg operand expected");
903 MI.addOperand(MCOperand::CreateReg(
904 getRegisterEnum(B, ARM::GPRRegClassID,
905 RmRn ? decodeRm(insn) : decodeRn(insn))));
909 // If this is a two-address operand, skip it, e.g., MOVCCr operand 1.
910 if (isUnary && (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)) {
911 MI.addOperand(MCOperand::CreateReg(0));
915 // Now disassemble operand 2.
919 if (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) {
920 // We have a reg/reg form.
921 // Assert disabled because saturating operations, e.g., A8.6.127 QASX, are
922 // routed here as well.
923 // assert(getIBit(insn) == 0 && "I_Bit != '0' reg/reg form");
924 MI.addOperand(MCOperand::CreateReg(
925 getRegisterEnum(B, ARM::GPRRegClassID,
926 RmRn? decodeRn(insn) : decodeRm(insn))));
928 } else if (Opcode == ARM::MOVi16 || Opcode == ARM::MOVTi16) {
929 // We have an imm16 = imm4:imm12 (imm4=Inst{19:16}, imm12 = Inst{11:0}).
930 assert(getIBit(insn) == 1 && "I_Bit != '1' reg/imm form");
931 unsigned Imm16 = slice(insn, 19, 16) << 12 | slice(insn, 11, 0);
932 MI.addOperand(MCOperand::CreateImm(Imm16));
935 // We have a reg/imm form.
936 // SOImm is 4-bit rotate amount in bits 11-8 with 8-bit imm in bits 7-0.
937 // A5.2.4 Rotate amount is twice the numeric value of Inst{11-8}.
938 // See also ARMAddressingModes.h: getSOImmValImm() and getSOImmValRot().
939 assert(getIBit(insn) == 1 && "I_Bit != '1' reg/imm form");
940 unsigned Rot = (insn >> ARMII::SoRotImmShift) & 0xF;
941 unsigned Imm = insn & 0xFF;
942 MI.addOperand(MCOperand::CreateImm(ARM_AM::rotr32(Imm, 2*Rot)));
949 static bool DisassembleDPSoRegFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
950 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
952 const TargetInstrDesc &TID = ARMInsts[Opcode];
953 unsigned short NumDefs = TID.getNumDefs();
954 bool isUnary = isUnaryDP(TID.TSFlags);
955 const TargetOperandInfo *OpInfo = TID.OpInfo;
956 unsigned &OpIdx = NumOpsAdded;
960 // Disassemble register def if there is one.
961 if (NumDefs && (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID)) {
962 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
967 // Disassemble the src operands.
971 // BinaryDP has an Rn operand.
973 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
974 "Reg operand expected");
975 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
980 // If this is a two-address operand, skip it, e.g., MOVCCs operand 1.
981 if (isUnary && (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)) {
982 MI.addOperand(MCOperand::CreateReg(0));
986 // Disassemble operand 2, which consists of three components.
987 if (OpIdx + 2 >= NumOps)
990 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
991 (OpInfo[OpIdx+1].RegClass == ARM::GPRRegClassID) &&
992 (OpInfo[OpIdx+2].RegClass < 0) &&
993 "Expect 3 reg operands");
995 // Register-controlled shifts have Inst{7} = 0 and Inst{4} = 1.
996 unsigned Rs = slice(insn, 4, 4);
998 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1001 // Register-controlled shifts: [Rm, Rs, shift].
1002 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1004 // Inst{6-5} encodes the shift opcode.
1005 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1006 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(ShOp, 0)));
1008 // Constant shifts: [Rm, reg0, shift_imm].
1009 MI.addOperand(MCOperand::CreateReg(0)); // NoRegister
1010 // Inst{6-5} encodes the shift opcode.
1011 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1012 // Inst{11-7} encodes the imm5 shift amount.
1013 unsigned ShImm = slice(insn, 11, 7);
1015 // A8.4.1. Possible rrx or shift amount of 32...
1016 getImmShiftSE(ShOp, ShImm);
1017 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(ShOp, ShImm)));
1024 static bool DisassembleLdStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1025 unsigned short NumOps, unsigned &NumOpsAdded, bool isStore, BO B) {
1027 const TargetInstrDesc &TID = ARMInsts[Opcode];
1028 bool isPrePost = isPrePostLdSt(TID.TSFlags);
1029 const TargetOperandInfo *OpInfo = TID.OpInfo;
1030 if (!OpInfo) return false;
1032 unsigned &OpIdx = NumOpsAdded;
1036 assert(((!isStore && TID.getNumDefs() > 0) ||
1037 (isStore && (TID.getNumDefs() == 0 || isPrePost)))
1038 && "Invalid arguments");
1040 // Operand 0 of a pre- and post-indexed store is the address base writeback.
1041 if (isPrePost && isStore) {
1042 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1043 "Reg operand expected");
1044 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1049 // Disassemble the dst/src operand.
1050 if (OpIdx >= NumOps)
1053 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1054 "Reg operand expected");
1055 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1059 // After dst of a pre- and post-indexed load is the address base writeback.
1060 if (isPrePost && !isStore) {
1061 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1062 "Reg operand expected");
1063 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1068 // Disassemble the base operand.
1069 if (OpIdx >= NumOps)
1072 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1073 "Reg operand expected");
1074 assert((!isPrePost || (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1))
1075 && "Index mode or tied_to operand expected");
1076 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1080 // For reg/reg form, base reg is followed by +/- reg shop imm.
1081 // For immediate form, it is followed by +/- imm12.
1082 // See also ARMAddressingModes.h (Addressing Mode #2).
1083 if (OpIdx + 1 >= NumOps)
1086 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1087 if (getIBit(insn) == 0) {
1088 // For pre- and post-indexed case, add a reg0 operand (Addressing Mode #2).
1089 // Otherwise, skip the reg operand since for addrmode_imm12, Rn has already
1092 MI.addOperand(MCOperand::CreateReg(0));
1096 // Disassemble the 12-bit immediate offset.
1097 unsigned Imm12 = slice(insn, 11, 0);
1098 unsigned Offset = ARM_AM::getAM2Opc(AddrOpcode, Imm12, ARM_AM::no_shift);
1099 MI.addOperand(MCOperand::CreateImm(Offset));
1102 // Disassemble the offset reg (Rm), shift type, and immediate shift length.
1103 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1105 // Inst{6-5} encodes the shift opcode.
1106 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1107 // Inst{11-7} encodes the imm5 shift amount.
1108 unsigned ShImm = slice(insn, 11, 7);
1110 // A8.4.1. Possible rrx or shift amount of 32...
1111 getImmShiftSE(ShOp, ShImm);
1112 MI.addOperand(MCOperand::CreateImm(
1113 ARM_AM::getAM2Opc(AddrOpcode, ShImm, ShOp)));
1120 static bool DisassembleLdFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1121 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1122 return DisassembleLdStFrm(MI, Opcode, insn, NumOps, NumOpsAdded, false, B);
1125 static bool DisassembleStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1126 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1127 return DisassembleLdStFrm(MI, Opcode, insn, NumOps, NumOpsAdded, true, B);
1130 static bool HasDualReg(unsigned Opcode) {
1134 case ARM::LDRD: case ARM::LDRD_PRE: case ARM::LDRD_POST:
1135 case ARM::STRD: case ARM::STRD_PRE: case ARM::STRD_POST:
1140 static bool DisassembleLdStMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1141 unsigned short NumOps, unsigned &NumOpsAdded, bool isStore, BO B) {
1143 const TargetInstrDesc &TID = ARMInsts[Opcode];
1144 bool isPrePost = isPrePostLdSt(TID.TSFlags);
1145 const TargetOperandInfo *OpInfo = TID.OpInfo;
1146 if (!OpInfo) return false;
1148 unsigned &OpIdx = NumOpsAdded;
1152 assert(((!isStore && TID.getNumDefs() > 0) ||
1153 (isStore && (TID.getNumDefs() == 0 || isPrePost)))
1154 && "Invalid arguments");
1156 // Operand 0 of a pre- and post-indexed store is the address base writeback.
1157 if (isPrePost && isStore) {
1158 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1159 "Reg operand expected");
1160 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1165 bool DualReg = HasDualReg(Opcode);
1167 // Disassemble the dst/src operand.
1168 if (OpIdx >= NumOps)
1171 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1172 "Reg operand expected");
1173 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1177 // Fill in LDRD and STRD's second operand, but only if it's offset mode OR we
1178 // have a pre-or-post-indexed store operation.
1179 if (DualReg && (!isPrePost || isStore)) {
1180 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1181 decodeRd(insn) + 1)));
1185 // After dst of a pre- and post-indexed load is the address base writeback.
1186 if (isPrePost && !isStore) {
1187 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1188 "Reg operand expected");
1189 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1194 // Disassemble the base operand.
1195 if (OpIdx >= NumOps)
1198 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1199 "Reg operand expected");
1200 assert((!isPrePost || (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1))
1201 && "Offset mode or tied_to operand expected");
1202 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1206 // For reg/reg form, base reg is followed by +/- reg.
1207 // For immediate form, it is followed by +/- imm8.
1208 // See also ARMAddressingModes.h (Addressing Mode #3).
1209 if (OpIdx + 1 >= NumOps)
1212 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
1213 (OpInfo[OpIdx+1].RegClass < 0) &&
1214 "Expect 1 reg operand followed by 1 imm operand");
1216 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1217 if (getAM3IBit(insn) == 1) {
1218 MI.addOperand(MCOperand::CreateReg(0));
1220 // Disassemble the 8-bit immediate offset.
1221 unsigned Imm4H = (insn >> ARMII::ImmHiShift) & 0xF;
1222 unsigned Imm4L = insn & 0xF;
1223 unsigned Offset = ARM_AM::getAM3Opc(AddrOpcode, (Imm4H << 4) | Imm4L);
1224 MI.addOperand(MCOperand::CreateImm(Offset));
1226 // Disassemble the offset reg (Rm).
1227 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1229 unsigned Offset = ARM_AM::getAM3Opc(AddrOpcode, 0);
1230 MI.addOperand(MCOperand::CreateImm(Offset));
1237 static bool DisassembleLdMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1238 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1239 return DisassembleLdStMiscFrm(MI, Opcode, insn, NumOps, NumOpsAdded, false,
1243 static bool DisassembleStMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1244 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1245 return DisassembleLdStMiscFrm(MI, Opcode, insn, NumOps, NumOpsAdded, true, B);
1248 // The algorithm for disassembly of LdStMulFrm is different from others because
1249 // it explicitly populates the two predicate operands after the base register.
1250 // After that, we need to populate the reglist with each affected register
1251 // encoded as an MCOperand.
1252 static bool DisassembleLdStMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1253 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1255 assert(NumOps >= 4 && "LdStMulFrm expects NumOps >= 4");
1258 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1260 // Writeback to base, if necessary.
1261 if (Opcode == ARM::LDMIA_UPD || Opcode == ARM::STMIA_UPD ||
1262 Opcode == ARM::LDMDA_UPD || Opcode == ARM::STMDA_UPD ||
1263 Opcode == ARM::LDMDB_UPD || Opcode == ARM::STMDB_UPD ||
1264 Opcode == ARM::LDMIB_UPD || Opcode == ARM::STMIB_UPD) {
1265 MI.addOperand(MCOperand::CreateReg(Base));
1269 // Add the base register operand.
1270 MI.addOperand(MCOperand::CreateReg(Base));
1272 // Handling the two predicate operands before the reglist.
1273 int64_t CondVal = insn >> ARMII::CondShift;
1274 MI.addOperand(MCOperand::CreateImm(CondVal == 0xF ? 0xE : CondVal));
1275 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
1279 // Fill the variadic part of reglist.
1280 unsigned RegListBits = insn & ((1 << 16) - 1);
1281 for (unsigned i = 0; i < 16; ++i) {
1282 if ((RegListBits >> i) & 1) {
1283 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1292 // LDREX, LDREXB, LDREXH: Rd Rn
1293 // LDREXD: Rd Rd+1 Rn
1294 // STREX, STREXB, STREXH: Rd Rm Rn
1295 // STREXD: Rd Rm Rm+1 Rn
1297 // SWP, SWPB: Rd Rm Rn
1298 static bool DisassembleLdStExFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1299 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1301 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1302 if (!OpInfo) return false;
1304 unsigned &OpIdx = NumOpsAdded;
1309 && OpInfo[0].RegClass == ARM::GPRRegClassID
1310 && OpInfo[1].RegClass == ARM::GPRRegClassID
1311 && "Expect 2 reg operands");
1313 bool isStore = slice(insn, 20, 20) == 0;
1314 bool isDW = (Opcode == ARM::LDREXD || Opcode == ARM::STREXD);
1316 // Add the destination operand.
1317 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1321 // Store register Exclusive needs a source operand.
1323 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1328 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1329 decodeRm(insn)+1)));
1333 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1334 decodeRd(insn)+1)));
1338 // Finally add the pointer operand.
1339 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1346 // Misc. Arithmetic Instructions.
1348 // PKHBT, PKHTB: Rd Rn Rm , LSL/ASR #imm5
1349 // RBIT, REV, REV16, REVSH: Rd Rm
1350 static bool DisassembleArithMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1351 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1353 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1354 unsigned &OpIdx = NumOpsAdded;
1359 && OpInfo[0].RegClass == ARM::GPRRegClassID
1360 && OpInfo[1].RegClass == ARM::GPRRegClassID
1361 && "Expect 2 reg operands");
1363 bool ThreeReg = NumOps > 2 && OpInfo[2].RegClass == ARM::GPRRegClassID;
1365 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1370 assert(NumOps >= 4 && "Expect >= 4 operands");
1371 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1376 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1380 // If there is still an operand info left which is an immediate operand, add
1381 // an additional imm5 LSL/ASR operand.
1382 if (ThreeReg && OpInfo[OpIdx].RegClass < 0
1383 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1384 // Extract the 5-bit immediate field Inst{11-7}.
1385 unsigned ShiftAmt = (insn >> ARMII::ShiftShift) & 0x1F;
1386 ARM_AM::ShiftOpc Opc = ARM_AM::no_shift;
1387 if (Opcode == ARM::PKHBT)
1389 else if (Opcode == ARM::PKHBT)
1391 getImmShiftSE(Opc, ShiftAmt);
1392 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(Opc, ShiftAmt)));
1399 /// DisassembleSatFrm - Disassemble saturate instructions:
1400 /// SSAT, SSAT16, USAT, and USAT16.
1401 static bool DisassembleSatFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1402 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1404 const TargetInstrDesc &TID = ARMInsts[Opcode];
1405 NumOpsAdded = TID.getNumOperands() - 2; // ignore predicate operands
1407 // Disassemble register def.
1408 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1411 unsigned Pos = slice(insn, 20, 16);
1412 if (Opcode == ARM::SSAT || Opcode == ARM::SSAT16)
1414 MI.addOperand(MCOperand::CreateImm(Pos));
1416 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1419 if (NumOpsAdded == 4) {
1420 ARM_AM::ShiftOpc Opc = (slice(insn, 6, 6) != 0 ? ARM_AM::asr : ARM_AM::lsl);
1421 // Inst{11-7} encodes the imm5 shift amount.
1422 unsigned ShAmt = slice(insn, 11, 7);
1424 // A8.6.183. Possible ASR shift amount of 32...
1425 if (Opc == ARM_AM::asr)
1428 Opc = ARM_AM::no_shift;
1430 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(Opc, ShAmt)));
1435 // Extend instructions.
1436 // SXT* and UXT*: Rd [Rn] Rm [rot_imm].
1437 // The 2nd operand register is Rn and the 3rd operand regsiter is Rm for the
1438 // three register operand form. Otherwise, Rn=0b1111 and only Rm is used.
1439 static bool DisassembleExtFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1440 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1442 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1443 unsigned &OpIdx = NumOpsAdded;
1448 && OpInfo[0].RegClass == ARM::GPRRegClassID
1449 && OpInfo[1].RegClass == ARM::GPRRegClassID
1450 && "Expect 2 reg operands");
1452 bool ThreeReg = NumOps > 2 && OpInfo[2].RegClass == ARM::GPRRegClassID;
1454 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1459 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1464 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1468 // If there is still an operand info left which is an immediate operand, add
1469 // an additional rotate immediate operand.
1470 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
1471 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1472 // Extract the 2-bit rotate field Inst{11-10}.
1473 unsigned rot = (insn >> ARMII::ExtRotImmShift) & 3;
1474 // Rotation by 8, 16, or 24 bits.
1475 MI.addOperand(MCOperand::CreateImm(rot << 3));
1482 /////////////////////////////////////
1484 // Utility Functions For VFP //
1486 /////////////////////////////////////
1488 // Extract/Decode Dd/Sd:
1490 // SP => d = UInt(Vd:D)
1491 // DP => d = UInt(D:Vd)
1492 static unsigned decodeVFPRd(uint32_t insn, bool isSPVFP) {
1493 return isSPVFP ? (decodeRd(insn) << 1 | getDBit(insn))
1494 : (decodeRd(insn) | getDBit(insn) << 4);
1497 // Extract/Decode Dn/Sn:
1499 // SP => n = UInt(Vn:N)
1500 // DP => n = UInt(N:Vn)
1501 static unsigned decodeVFPRn(uint32_t insn, bool isSPVFP) {
1502 return isSPVFP ? (decodeRn(insn) << 1 | getNBit(insn))
1503 : (decodeRn(insn) | getNBit(insn) << 4);
1506 // Extract/Decode Dm/Sm:
1508 // SP => m = UInt(Vm:M)
1509 // DP => m = UInt(M:Vm)
1510 static unsigned decodeVFPRm(uint32_t insn, bool isSPVFP) {
1511 return isSPVFP ? (decodeRm(insn) << 1 | getMBit(insn))
1512 : (decodeRm(insn) | getMBit(insn) << 4);
1516 static APInt VFPExpandImm(unsigned char byte, unsigned N) {
1517 assert(N == 32 || N == 64);
1520 unsigned bit6 = slice(byte, 6, 6);
1522 Result = slice(byte, 7, 7) << 31 | slice(byte, 5, 0) << 19;
1524 Result |= 0x1f << 25;
1526 Result |= 0x1 << 30;
1528 Result = (uint64_t)slice(byte, 7, 7) << 63 |
1529 (uint64_t)slice(byte, 5, 0) << 48;
1531 Result |= 0xffULL << 54;
1533 Result |= 0x1ULL << 62;
1535 return APInt(N, Result);
1538 // VFP Unary Format Instructions:
1540 // VCMP[E]ZD, VCMP[E]ZS: compares one floating-point register with zero
1541 // VCVTDS, VCVTSD: converts between double-precision and single-precision
1542 // The rest of the instructions have homogeneous [VFP]Rd and [VFP]Rm registers.
1543 static bool DisassembleVFPUnaryFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1544 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1546 assert(NumOps >= 1 && "VFPUnaryFrm expects NumOps >= 1");
1548 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1549 unsigned &OpIdx = NumOpsAdded;
1553 unsigned RegClass = OpInfo[OpIdx].RegClass;
1554 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1555 "Reg operand expected");
1556 bool isSP = (RegClass == ARM::SPRRegClassID);
1558 MI.addOperand(MCOperand::CreateReg(
1559 getRegisterEnum(B, RegClass, decodeVFPRd(insn, isSP))));
1562 // Early return for compare with zero instructions.
1563 if (Opcode == ARM::VCMPEZD || Opcode == ARM::VCMPEZS
1564 || Opcode == ARM::VCMPZD || Opcode == ARM::VCMPZS)
1567 RegClass = OpInfo[OpIdx].RegClass;
1568 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1569 "Reg operand expected");
1570 isSP = (RegClass == ARM::SPRRegClassID);
1572 MI.addOperand(MCOperand::CreateReg(
1573 getRegisterEnum(B, RegClass, decodeVFPRm(insn, isSP))));
1579 // All the instructions have homogeneous [VFP]Rd, [VFP]Rn, and [VFP]Rm regs.
1580 // Some of them have operand constraints which tie the first operand in the
1581 // InOperandList to that of the dst. As far as asm printing is concerned, this
1582 // tied_to operand is simply skipped.
1583 static bool DisassembleVFPBinaryFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1584 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1586 assert(NumOps >= 3 && "VFPBinaryFrm expects NumOps >= 3");
1588 const TargetInstrDesc &TID = ARMInsts[Opcode];
1589 const TargetOperandInfo *OpInfo = TID.OpInfo;
1590 unsigned &OpIdx = NumOpsAdded;
1594 unsigned RegClass = OpInfo[OpIdx].RegClass;
1595 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1596 "Reg operand expected");
1597 bool isSP = (RegClass == ARM::SPRRegClassID);
1599 MI.addOperand(MCOperand::CreateReg(
1600 getRegisterEnum(B, RegClass, decodeVFPRd(insn, isSP))));
1603 // Skip tied_to operand constraint.
1604 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
1605 assert(NumOps >= 4 && "Expect >=4 operands");
1606 MI.addOperand(MCOperand::CreateReg(0));
1610 MI.addOperand(MCOperand::CreateReg(
1611 getRegisterEnum(B, RegClass, decodeVFPRn(insn, isSP))));
1614 MI.addOperand(MCOperand::CreateReg(
1615 getRegisterEnum(B, RegClass, decodeVFPRm(insn, isSP))));
1621 // A8.6.295 vcvt (floating-point <-> integer)
1622 // Int to FP: VSITOD, VSITOS, VUITOD, VUITOS
1623 // FP to Int: VTOSI[Z|R]D, VTOSI[Z|R]S, VTOUI[Z|R]D, VTOUI[Z|R]S
1625 // A8.6.297 vcvt (floating-point and fixed-point)
1626 // Dd|Sd Dd|Sd(TIED_TO) #fbits(= 16|32 - UInt(imm4:i))
1627 static bool DisassembleVFPConv1Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1628 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1630 assert(NumOps >= 2 && "VFPConv1Frm expects NumOps >= 2");
1632 const TargetInstrDesc &TID = ARMInsts[Opcode];
1633 const TargetOperandInfo *OpInfo = TID.OpInfo;
1634 if (!OpInfo) return false;
1636 bool SP = slice(insn, 8, 8) == 0; // A8.6.295 & A8.6.297
1637 bool fixed_point = slice(insn, 17, 17) == 1; // A8.6.297
1638 unsigned RegClassID = SP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1642 assert(NumOps >= 3 && "Expect >= 3 operands");
1643 int size = slice(insn, 7, 7) == 0 ? 16 : 32;
1644 int fbits = size - (slice(insn,3,0) << 1 | slice(insn,5,5));
1645 MI.addOperand(MCOperand::CreateReg(
1646 getRegisterEnum(B, RegClassID,
1647 decodeVFPRd(insn, SP))));
1649 assert(TID.getOperandConstraint(1, TOI::TIED_TO) != -1 &&
1650 "Tied to operand expected");
1651 MI.addOperand(MI.getOperand(0));
1653 assert(OpInfo[2].RegClass < 0 && !OpInfo[2].isPredicate() &&
1654 !OpInfo[2].isOptionalDef() && "Imm operand expected");
1655 MI.addOperand(MCOperand::CreateImm(fbits));
1660 // The Rd (destination) and Rm (source) bits have different interpretations
1661 // depending on their single-precisonness.
1663 if (slice(insn, 18, 18) == 1) { // to_integer operation
1664 d = decodeVFPRd(insn, true /* Is Single Precision */);
1665 MI.addOperand(MCOperand::CreateReg(
1666 getRegisterEnum(B, ARM::SPRRegClassID, d)));
1667 m = decodeVFPRm(insn, SP);
1668 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, m)));
1670 d = decodeVFPRd(insn, SP);
1671 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, d)));
1672 m = decodeVFPRm(insn, true /* Is Single Precision */);
1673 MI.addOperand(MCOperand::CreateReg(
1674 getRegisterEnum(B, ARM::SPRRegClassID, m)));
1682 // VMOVRS - A8.6.330
1683 // Rt => Rd; Sn => UInt(Vn:N)
1684 static bool DisassembleVFPConv2Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1685 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1687 assert(NumOps >= 2 && "VFPConv2Frm expects NumOps >= 2");
1689 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1691 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1692 decodeVFPRn(insn, true))));
1697 // VMOVRRD - A8.6.332
1698 // Rt => Rd; Rt2 => Rn; Dm => UInt(M:Vm)
1700 // VMOVRRS - A8.6.331
1701 // Rt => Rd; Rt2 => Rn; Sm => UInt(Vm:M); Sm1 = Sm+1
1702 static bool DisassembleVFPConv3Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1703 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1705 assert(NumOps >= 3 && "VFPConv3Frm expects NumOps >= 3");
1707 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1708 unsigned &OpIdx = NumOpsAdded;
1710 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1712 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1716 if (OpInfo[OpIdx].RegClass == ARM::SPRRegClassID) {
1717 unsigned Sm = decodeVFPRm(insn, true);
1718 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1720 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1724 MI.addOperand(MCOperand::CreateReg(
1725 getRegisterEnum(B, ARM::DPRRegClassID,
1726 decodeVFPRm(insn, false))));
1732 // VMOVSR - A8.6.330
1733 // Rt => Rd; Sn => UInt(Vn:N)
1734 static bool DisassembleVFPConv4Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1735 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1737 assert(NumOps >= 2 && "VFPConv4Frm expects NumOps >= 2");
1739 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1740 decodeVFPRn(insn, true))));
1741 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1747 // VMOVDRR - A8.6.332
1748 // Rt => Rd; Rt2 => Rn; Dm => UInt(M:Vm)
1750 // VMOVRRS - A8.6.331
1751 // Rt => Rd; Rt2 => Rn; Sm => UInt(Vm:M); Sm1 = Sm+1
1752 static bool DisassembleVFPConv5Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1753 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1755 assert(NumOps >= 3 && "VFPConv5Frm expects NumOps >= 3");
1757 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1758 unsigned &OpIdx = NumOpsAdded;
1762 if (OpInfo[OpIdx].RegClass == ARM::SPRRegClassID) {
1763 unsigned Sm = decodeVFPRm(insn, true);
1764 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1766 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1770 MI.addOperand(MCOperand::CreateReg(
1771 getRegisterEnum(B, ARM::DPRRegClassID,
1772 decodeVFPRm(insn, false))));
1776 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1778 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1784 // VFP Load/Store Instructions.
1785 // VLDRD, VLDRS, VSTRD, VSTRS
1786 static bool DisassembleVFPLdStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1787 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1789 assert(NumOps >= 3 && "VFPLdStFrm expects NumOps >= 3");
1791 bool isSPVFP = (Opcode == ARM::VLDRS || Opcode == ARM::VSTRS);
1792 unsigned RegClassID = isSPVFP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1794 // Extract Dd/Sd for operand 0.
1795 unsigned RegD = decodeVFPRd(insn, isSPVFP);
1797 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, RegD)));
1799 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1800 MI.addOperand(MCOperand::CreateReg(Base));
1802 // Next comes the AM5 Opcode.
1803 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1804 unsigned char Imm8 = insn & 0xFF;
1805 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(AddrOpcode, Imm8)));
1812 // VFP Load/Store Multiple Instructions.
1813 // We have an optional write back reg, the base, and two predicate operands.
1814 // It is then followed by a reglist of either DPR(s) or SPR(s).
1816 // VLDMD[_UPD], VLDMS[_UPD], VSTMD[_UPD], VSTMS[_UPD]
1817 static bool DisassembleVFPLdStMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1818 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1820 assert(NumOps >= 4 && "VFPLdStMulFrm expects NumOps >= 4");
1822 unsigned &OpIdx = NumOpsAdded;
1826 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1828 // Writeback to base, if necessary.
1829 if (Opcode == ARM::VLDMDIA_UPD || Opcode == ARM::VLDMSIA_UPD ||
1830 Opcode == ARM::VLDMDDB_UPD || Opcode == ARM::VLDMSDB_UPD ||
1831 Opcode == ARM::VSTMDIA_UPD || Opcode == ARM::VSTMSIA_UPD ||
1832 Opcode == ARM::VSTMDDB_UPD || Opcode == ARM::VSTMSDB_UPD) {
1833 MI.addOperand(MCOperand::CreateReg(Base));
1837 MI.addOperand(MCOperand::CreateReg(Base));
1839 // Handling the two predicate operands before the reglist.
1840 int64_t CondVal = insn >> ARMII::CondShift;
1841 MI.addOperand(MCOperand::CreateImm(CondVal == 0xF ? 0xE : CondVal));
1842 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
1846 bool isSPVFP = (Opcode == ARM::VLDMSIA ||
1847 Opcode == ARM::VLDMSIA_UPD || Opcode == ARM::VLDMSDB_UPD ||
1848 Opcode == ARM::VSTMSIA ||
1849 Opcode == ARM::VSTMSIA_UPD || Opcode == ARM::VSTMSDB_UPD);
1850 unsigned RegClassID = isSPVFP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1853 unsigned RegD = decodeVFPRd(insn, isSPVFP);
1855 // Fill the variadic part of reglist.
1856 unsigned char Imm8 = insn & 0xFF;
1857 unsigned Regs = isSPVFP ? Imm8 : Imm8/2;
1859 // Apply some sanity checks before proceeding.
1860 if (Regs == 0 || (RegD + Regs) > 32 || (!isSPVFP && Regs > 16))
1863 for (unsigned i = 0; i < Regs; ++i) {
1864 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID,
1872 // Misc. VFP Instructions.
1873 // FMSTAT (vmrs with Rt=0b1111, i.e., to apsr_nzcv and no register operand)
1874 // FCONSTD (DPR and a VFPf64Imm operand)
1875 // FCONSTS (SPR and a VFPf32Imm operand)
1876 // VMRS/VMSR (GPR operand)
1877 static bool DisassembleVFPMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1878 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1880 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1881 unsigned &OpIdx = NumOpsAdded;
1885 if (Opcode == ARM::FMSTAT)
1888 assert(NumOps >= 2 && "VFPMiscFrm expects >=2 operands");
1890 unsigned RegEnum = 0;
1891 switch (OpInfo[0].RegClass) {
1892 case ARM::DPRRegClassID:
1893 RegEnum = getRegisterEnum(B, ARM::DPRRegClassID, decodeVFPRd(insn, false));
1895 case ARM::SPRRegClassID:
1896 RegEnum = getRegisterEnum(B, ARM::SPRRegClassID, decodeVFPRd(insn, true));
1898 case ARM::GPRRegClassID:
1899 RegEnum = getRegisterEnum(B, ARM::GPRRegClassID, decodeRd(insn));
1902 assert(0 && "Invalid reg class id");
1906 MI.addOperand(MCOperand::CreateReg(RegEnum));
1909 // Extract/decode the f64/f32 immediate.
1910 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
1911 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1912 // The asm syntax specifies the floating point value, not the 8-bit literal.
1913 APInt immRaw = VFPExpandImm(slice(insn,19,16) << 4 | slice(insn, 3, 0),
1914 Opcode == ARM::FCONSTD ? 64 : 32);
1915 APFloat immFP = APFloat(immRaw, true);
1916 double imm = Opcode == ARM::FCONSTD ? immFP.convertToDouble() :
1917 immFP.convertToFloat();
1918 MI.addOperand(MCOperand::CreateFPImm(imm));
1926 // DisassembleThumbFrm() is defined in ThumbDisassemblerCore.h file.
1927 #include "ThumbDisassemblerCore.h"
1929 /////////////////////////////////////////////////////
1931 // Utility Functions For ARM Advanced SIMD //
1933 /////////////////////////////////////////////////////
1935 // The following NEON namings are based on A8.6.266 VABA, VABAL. Notice that
1936 // A8.6.303 VDUP (ARM core register)'s D/Vd pair is the N/Vn pair of VABA/VABAL.
1938 // A7.3 Register encoding
1940 // Extract/Decode NEON D/Vd:
1942 // Note that for quadword, Qd = UInt(D:Vd<3:1>) = Inst{22:15-13}, whereas for
1943 // doubleword, Dd = UInt(D:Vd). We compensate for this difference by
1944 // handling it in the getRegisterEnum() utility function.
1945 // D = Inst{22}, Vd = Inst{15-12}
1946 static unsigned decodeNEONRd(uint32_t insn) {
1947 return ((insn >> ARMII::NEON_D_BitShift) & 1) << 4
1948 | ((insn >> ARMII::NEON_RegRdShift) & ARMII::NEONRegMask);
1951 // Extract/Decode NEON N/Vn:
1953 // Note that for quadword, Qn = UInt(N:Vn<3:1>) = Inst{7:19-17}, whereas for
1954 // doubleword, Dn = UInt(N:Vn). We compensate for this difference by
1955 // handling it in the getRegisterEnum() utility function.
1956 // N = Inst{7}, Vn = Inst{19-16}
1957 static unsigned decodeNEONRn(uint32_t insn) {
1958 return ((insn >> ARMII::NEON_N_BitShift) & 1) << 4
1959 | ((insn >> ARMII::NEON_RegRnShift) & ARMII::NEONRegMask);
1962 // Extract/Decode NEON M/Vm:
1964 // Note that for quadword, Qm = UInt(M:Vm<3:1>) = Inst{5:3-1}, whereas for
1965 // doubleword, Dm = UInt(M:Vm). We compensate for this difference by
1966 // handling it in the getRegisterEnum() utility function.
1967 // M = Inst{5}, Vm = Inst{3-0}
1968 static unsigned decodeNEONRm(uint32_t insn) {
1969 return ((insn >> ARMII::NEON_M_BitShift) & 1) << 4
1970 | ((insn >> ARMII::NEON_RegRmShift) & ARMII::NEONRegMask);
1981 } // End of unnamed namespace
1983 // size field -> Inst{11-10}
1984 // index_align field -> Inst{7-4}
1986 // The Lane Index interpretation depends on the Data Size:
1987 // 8 (encoded as size = 0b00) -> Index = index_align[3:1]
1988 // 16 (encoded as size = 0b01) -> Index = index_align[3:2]
1989 // 32 (encoded as size = 0b10) -> Index = index_align[3]
1991 // Ref: A8.6.317 VLD4 (single 4-element structure to one lane).
1992 static unsigned decodeLaneIndex(uint32_t insn) {
1993 unsigned size = insn >> 10 & 3;
1994 assert((size == 0 || size == 1 || size == 2) &&
1995 "Encoding error: size should be either 0, 1, or 2");
1997 unsigned index_align = insn >> 4 & 0xF;
1998 return (index_align >> 1) >> size;
2001 // imm64 = AdvSIMDExpandImm(op, cmode, i:imm3:imm4)
2002 // op = Inst{5}, cmode = Inst{11-8}
2003 // i = Inst{24} (ARM architecture)
2004 // imm3 = Inst{18-16}, imm4 = Inst{3-0}
2005 // Ref: Table A7-15 Modified immediate values for Advanced SIMD instructions.
2006 static uint64_t decodeN1VImm(uint32_t insn, ElemSize esize) {
2007 unsigned char op = (insn >> 5) & 1;
2008 unsigned char cmode = (insn >> 8) & 0xF;
2009 unsigned char Imm8 = ((insn >> 24) & 1) << 7 |
2010 ((insn >> 16) & 7) << 4 |
2012 return (op << 12) | (cmode << 8) | Imm8;
2015 // A8.6.339 VMUL, VMULL (by scalar)
2016 // ESize16 => m = Inst{2-0} (Vm<2:0>) D0-D7
2017 // ESize32 => m = Inst{3-0} (Vm<3:0>) D0-D15
2018 static unsigned decodeRestrictedDm(uint32_t insn, ElemSize esize) {
2025 assert(0 && "Unreachable code!");
2030 // A8.6.339 VMUL, VMULL (by scalar)
2031 // ESize16 => index = Inst{5:3} (M:Vm<3>) D0-D7
2032 // ESize32 => index = Inst{5} (M) D0-D15
2033 static unsigned decodeRestrictedDmIndex(uint32_t insn, ElemSize esize) {
2036 return (((insn >> 5) & 1) << 1) | ((insn >> 3) & 1);
2038 return (insn >> 5) & 1;
2040 assert(0 && "Unreachable code!");
2045 // A8.6.296 VCVT (between floating-point and fixed-point, Advanced SIMD)
2046 // (64 - <fbits>) is encoded as imm6, i.e., Inst{21-16}.
2047 static unsigned decodeVCVTFractionBits(uint32_t insn) {
2048 return 64 - ((insn >> 16) & 0x3F);
2051 // A8.6.302 VDUP (scalar)
2052 // ESize8 => index = Inst{19-17}
2053 // ESize16 => index = Inst{19-18}
2054 // ESize32 => index = Inst{19}
2055 static unsigned decodeNVLaneDupIndex(uint32_t insn, ElemSize esize) {
2058 return (insn >> 17) & 7;
2060 return (insn >> 18) & 3;
2062 return (insn >> 19) & 1;
2064 assert(0 && "Unspecified element size!");
2069 // A8.6.328 VMOV (ARM core register to scalar)
2070 // A8.6.329 VMOV (scalar to ARM core register)
2071 // ESize8 => index = Inst{21:6-5}
2072 // ESize16 => index = Inst{21:6}
2073 // ESize32 => index = Inst{21}
2074 static unsigned decodeNVLaneOpIndex(uint32_t insn, ElemSize esize) {
2077 return ((insn >> 21) & 1) << 2 | ((insn >> 5) & 3);
2079 return ((insn >> 21) & 1) << 1 | ((insn >> 6) & 1);
2081 return ((insn >> 21) & 1);
2083 assert(0 && "Unspecified element size!");
2088 // Imm6 = Inst{21-16}, L = Inst{7}
2090 // LeftShift == true (A8.6.367 VQSHL, A8.6.387 VSLI):
2092 // '0001xxx' => esize = 8; shift_amount = imm6 - 8
2093 // '001xxxx' => esize = 16; shift_amount = imm6 - 16
2094 // '01xxxxx' => esize = 32; shift_amount = imm6 - 32
2095 // '1xxxxxx' => esize = 64; shift_amount = imm6
2097 // LeftShift == false (A8.6.376 VRSHR, A8.6.368 VQSHRN):
2099 // '0001xxx' => esize = 8; shift_amount = 16 - imm6
2100 // '001xxxx' => esize = 16; shift_amount = 32 - imm6
2101 // '01xxxxx' => esize = 32; shift_amount = 64 - imm6
2102 // '1xxxxxx' => esize = 64; shift_amount = 64 - imm6
2104 static unsigned decodeNVSAmt(uint32_t insn, bool LeftShift) {
2105 ElemSize esize = ESizeNA;
2106 unsigned L = (insn >> 7) & 1;
2107 unsigned imm6 = (insn >> 16) & 0x3F;
2111 else if (imm6 >> 4 == 1)
2113 else if (imm6 >> 5 == 1)
2116 assert(0 && "Wrong encoding of Inst{7:21-16}!");
2121 return esize == ESize64 ? imm6 : (imm6 - esize);
2123 return esize == ESize64 ? (esize - imm6) : (2*esize - imm6);
2127 // Imm4 = Inst{11-8}
2128 static unsigned decodeN3VImm(uint32_t insn) {
2129 return (insn >> 8) & 0xF;
2133 // D[d] D[d2] ... Rn [TIED_TO Rn] align [Rm]
2135 // D[d] D[d2] ... Rn [TIED_TO Rn] align [Rm] TIED_TO ... imm(idx)
2137 // Rn [TIED_TO Rn] align [Rm] D[d] D[d2] ...
2139 // Rn [TIED_TO Rn] align [Rm] D[d] D[d2] ... [imm(idx)]
2141 // Correctly set VLD*/VST*'s TIED_TO GPR, as the asm printer needs it.
2142 static bool DisassembleNLdSt0(MCInst &MI, unsigned Opcode, uint32_t insn,
2143 unsigned short NumOps, unsigned &NumOpsAdded, bool Store, bool DblSpaced,
2146 const TargetInstrDesc &TID = ARMInsts[Opcode];
2147 const TargetOperandInfo *OpInfo = TID.OpInfo;
2149 // At least one DPR register plus addressing mode #6.
2150 assert(NumOps >= 3 && "Expect >= 3 operands");
2152 unsigned &OpIdx = NumOpsAdded;
2156 // We have homogeneous NEON registers for Load/Store.
2157 unsigned RegClass = 0;
2159 // Double-spaced registers have increments of 2.
2160 unsigned Inc = DblSpaced ? 2 : 1;
2162 unsigned Rn = decodeRn(insn);
2163 unsigned Rm = decodeRm(insn);
2164 unsigned Rd = decodeNEONRd(insn);
2166 // A7.7.1 Advanced SIMD addressing mode.
2169 // LLVM Addressing Mode #6.
2170 unsigned RmEnum = 0;
2172 RmEnum = getRegisterEnum(B, ARM::GPRRegClassID, Rm);
2175 // Consume possible WB, AddrMode6, possible increment reg, the DPR/QPR's,
2176 // then possible lane index.
2177 assert(OpIdx < NumOps && OpInfo[0].RegClass == ARM::GPRRegClassID &&
2178 "Reg operand expected");
2181 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2186 assert((OpIdx+1) < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
2187 OpInfo[OpIdx + 1].RegClass < 0 && "Addrmode #6 Operands expected");
2188 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2190 MI.addOperand(MCOperand::CreateImm(0)); // Alignment ignored?
2194 MI.addOperand(MCOperand::CreateReg(RmEnum));
2198 assert(OpIdx < NumOps &&
2199 (OpInfo[OpIdx].RegClass == ARM::DPRRegClassID ||
2200 OpInfo[OpIdx].RegClass == ARM::QPRRegClassID) &&
2201 "Reg operand expected");
2203 RegClass = OpInfo[OpIdx].RegClass;
2204 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2205 MI.addOperand(MCOperand::CreateReg(
2206 getRegisterEnum(B, RegClass, Rd)));
2211 // Handle possible lane index.
2212 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2213 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2214 MI.addOperand(MCOperand::CreateImm(decodeLaneIndex(insn)));
2219 // Consume the DPR/QPR's, possible WB, AddrMode6, possible incrment reg,
2220 // possible TIED_TO DPR/QPR's (ignored), then possible lane index.
2221 RegClass = OpInfo[0].RegClass;
2223 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2224 MI.addOperand(MCOperand::CreateReg(
2225 getRegisterEnum(B, RegClass, Rd)));
2231 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2236 assert((OpIdx+1) < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
2237 OpInfo[OpIdx + 1].RegClass < 0 && "Addrmode #6 Operands expected");
2238 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2240 MI.addOperand(MCOperand::CreateImm(0)); // Alignment ignored?
2244 MI.addOperand(MCOperand::CreateReg(RmEnum));
2248 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2249 assert(TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1 &&
2250 "Tied to operand expected");
2251 MI.addOperand(MCOperand::CreateReg(0));
2255 // Handle possible lane index.
2256 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2257 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2258 MI.addOperand(MCOperand::CreateImm(decodeLaneIndex(insn)));
2263 // Accessing registers past the end of the NEON register file is not
2272 // If L (Inst{21}) == 0, store instructions.
2273 // Find out about double-spaced-ness of the Opcode and pass it on to
2274 // DisassembleNLdSt0().
2275 static bool DisassembleNLdSt(MCInst &MI, unsigned Opcode, uint32_t insn,
2276 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2278 const StringRef Name = ARMInsts[Opcode].Name;
2279 bool DblSpaced = false;
2281 if (Name.find("LN") != std::string::npos) {
2282 // To one lane instructions.
2283 // See, for example, 8.6.317 VLD4 (single 4-element structure to one lane).
2285 // <size> == 16 && Inst{5} == 1 --> DblSpaced = true
2286 if (Name.endswith("16") || Name.endswith("16_UPD"))
2287 DblSpaced = slice(insn, 5, 5) == 1;
2289 // <size> == 32 && Inst{6} == 1 --> DblSpaced = true
2290 if (Name.endswith("32") || Name.endswith("32_UPD"))
2291 DblSpaced = slice(insn, 6, 6) == 1;
2294 // Multiple n-element structures with type encoded as Inst{11-8}.
2295 // See, for example, A8.6.316 VLD4 (multiple 4-element structures).
2297 // n == 2 && type == 0b1001 -> DblSpaced = true
2298 if (Name.startswith("VST2") || Name.startswith("VLD2"))
2299 DblSpaced = slice(insn, 11, 8) == 9;
2301 // n == 3 && type == 0b0101 -> DblSpaced = true
2302 if (Name.startswith("VST3") || Name.startswith("VLD3"))
2303 DblSpaced = slice(insn, 11, 8) == 5;
2305 // n == 4 && type == 0b0001 -> DblSpaced = true
2306 if (Name.startswith("VST4") || Name.startswith("VLD4"))
2307 DblSpaced = slice(insn, 11, 8) == 1;
2310 return DisassembleNLdSt0(MI, Opcode, insn, NumOps, NumOpsAdded,
2311 slice(insn, 21, 21) == 0, DblSpaced, B);
2318 // Qd/Dd imm src(=Qd/Dd)
2319 static bool DisassembleN1RegModImmFrm(MCInst &MI, unsigned Opcode,
2320 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2322 const TargetInstrDesc &TID = ARMInsts[Opcode];
2323 const TargetOperandInfo *OpInfo = TID.OpInfo;
2325 assert(NumOps >= 2 &&
2326 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2327 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2328 (OpInfo[1].RegClass < 0) &&
2329 "Expect 1 reg operand followed by 1 imm operand");
2331 // Qd/Dd = Inst{22:15-12} => NEON Rd
2332 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[0].RegClass,
2333 decodeNEONRd(insn))));
2335 ElemSize esize = ESizeNA;
2338 case ARM::VMOVv16i8:
2341 case ARM::VMOVv4i16:
2342 case ARM::VMOVv8i16:
2343 case ARM::VMVNv4i16:
2344 case ARM::VMVNv8i16:
2345 case ARM::VBICiv4i16:
2346 case ARM::VBICiv8i16:
2347 case ARM::VORRiv4i16:
2348 case ARM::VORRiv8i16:
2351 case ARM::VMOVv2i32:
2352 case ARM::VMOVv4i32:
2353 case ARM::VMVNv2i32:
2354 case ARM::VMVNv4i32:
2355 case ARM::VBICiv2i32:
2356 case ARM::VBICiv4i32:
2357 case ARM::VORRiv2i32:
2358 case ARM::VORRiv4i32:
2361 case ARM::VMOVv1i64:
2362 case ARM::VMOVv2i64:
2366 assert(0 && "Unexpected opcode!");
2370 // One register and a modified immediate value.
2371 // Add the imm operand.
2372 MI.addOperand(MCOperand::CreateImm(decodeN1VImm(insn, esize)));
2376 // VBIC/VORRiv*i* variants have an extra $src = $Vd to be filled in.
2378 (OpInfo[2].RegClass == ARM::DPRRegClassID ||
2379 OpInfo[2].RegClass == ARM::QPRRegClassID)) {
2380 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[0].RegClass,
2381 decodeNEONRd(insn))));
2392 N2V_VectorConvert_Between_Float_Fixed
2394 } // End of unnamed namespace
2396 // Vector Convert [between floating-point and fixed-point]
2397 // Qd/Dd Qm/Dm [fbits]
2399 // Vector Duplicate Lane (from scalar to all elements) Instructions.
2400 // VDUPLN16d, VDUPLN16q, VDUPLN32d, VDUPLN32q, VDUPLN8d, VDUPLN8q:
2403 // Vector Move Long:
2406 // Vector Move Narrow:
2410 static bool DisassembleNVdVmOptImm(MCInst &MI, unsigned Opc, uint32_t insn,
2411 unsigned short NumOps, unsigned &NumOpsAdded, N2VFlag Flag, BO B) {
2413 const TargetInstrDesc &TID = ARMInsts[Opc];
2414 const TargetOperandInfo *OpInfo = TID.OpInfo;
2416 assert(NumOps >= 2 &&
2417 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2418 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2419 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2420 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2421 "Expect >= 2 operands and first 2 as reg operands");
2423 unsigned &OpIdx = NumOpsAdded;
2427 ElemSize esize = ESizeNA;
2428 if (Flag == N2V_VectorDupLane) {
2429 // VDUPLN has its index embedded. Its size can be inferred from the Opcode.
2430 assert(Opc >= ARM::VDUPLN16d && Opc <= ARM::VDUPLN8q &&
2431 "Unexpected Opcode");
2432 esize = (Opc == ARM::VDUPLN8d || Opc == ARM::VDUPLN8q) ? ESize8
2433 : ((Opc == ARM::VDUPLN16d || Opc == ARM::VDUPLN16q) ? ESize16
2437 // Qd/Dd = Inst{22:15-12} => NEON Rd
2438 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2439 decodeNEONRd(insn))));
2443 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2445 MI.addOperand(MCOperand::CreateReg(0));
2449 // Dm = Inst{5:3-0} => NEON Rm
2450 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2451 decodeNEONRm(insn))));
2454 // VZIP and others have two TIED_TO reg operands.
2456 while (OpIdx < NumOps &&
2457 (Idx = TID.getOperandConstraint(OpIdx, TOI::TIED_TO)) != -1) {
2458 // Add TIED_TO operand.
2459 MI.addOperand(MI.getOperand(Idx));
2463 // Add the imm operand, if required.
2464 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2465 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2467 unsigned imm = 0xFFFFFFFF;
2469 if (Flag == N2V_VectorDupLane)
2470 imm = decodeNVLaneDupIndex(insn, esize);
2471 if (Flag == N2V_VectorConvert_Between_Float_Fixed)
2472 imm = decodeVCVTFractionBits(insn);
2474 assert(imm != 0xFFFFFFFF && "Internal error");
2475 MI.addOperand(MCOperand::CreateImm(imm));
2482 static bool DisassembleN2RegFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2483 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2485 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2488 static bool DisassembleNVCVTFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2489 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2491 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2492 N2V_VectorConvert_Between_Float_Fixed, B);
2494 static bool DisassembleNVecDupLnFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2495 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2497 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2498 N2V_VectorDupLane, B);
2501 // Vector Shift [Accumulate] Instructions.
2502 // Qd/Dd [Qd/Dd (TIED_TO)] Qm/Dm ShiftAmt
2504 // Vector Shift Left Long (with maximum shift count) Instructions.
2505 // VSHLLi16, VSHLLi32, VSHLLi8: Qd Dm imm (== size)
2507 static bool DisassembleNVectorShift(MCInst &MI, unsigned Opcode, uint32_t insn,
2508 unsigned short NumOps, unsigned &NumOpsAdded, bool LeftShift, BO B) {
2510 const TargetInstrDesc &TID = ARMInsts[Opcode];
2511 const TargetOperandInfo *OpInfo = TID.OpInfo;
2513 assert(NumOps >= 3 &&
2514 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2515 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2516 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2517 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2518 "Expect >= 3 operands and first 2 as reg operands");
2520 unsigned &OpIdx = NumOpsAdded;
2524 // Qd/Dd = Inst{22:15-12} => NEON Rd
2525 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2526 decodeNEONRd(insn))));
2529 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2531 MI.addOperand(MCOperand::CreateReg(0));
2535 assert((OpInfo[OpIdx].RegClass == ARM::DPRRegClassID ||
2536 OpInfo[OpIdx].RegClass == ARM::QPRRegClassID) &&
2537 "Reg operand expected");
2539 // Qm/Dm = Inst{5:3-0} => NEON Rm
2540 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2541 decodeNEONRm(insn))));
2544 assert(OpInfo[OpIdx].RegClass < 0 && "Imm operand expected");
2546 // Add the imm operand.
2548 // VSHLL has maximum shift count as the imm, inferred from its size.
2552 Imm = decodeNVSAmt(insn, LeftShift);
2564 MI.addOperand(MCOperand::CreateImm(Imm));
2570 // Left shift instructions.
2571 static bool DisassembleN2RegVecShLFrm(MCInst &MI, unsigned Opcode,
2572 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2574 return DisassembleNVectorShift(MI, Opcode, insn, NumOps, NumOpsAdded, true,
2577 // Right shift instructions have different shift amount interpretation.
2578 static bool DisassembleN2RegVecShRFrm(MCInst &MI, unsigned Opcode,
2579 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2581 return DisassembleNVectorShift(MI, Opcode, insn, NumOps, NumOpsAdded, false,
2590 N3V_Multiply_By_Scalar
2592 } // End of unnamed namespace
2594 // NEON Three Register Instructions with Optional Immediate Operand
2596 // Vector Extract Instructions.
2597 // Qd/Dd Qn/Dn Qm/Dm imm4
2599 // Vector Shift (Register) Instructions.
2600 // Qd/Dd Qm/Dm Qn/Dn (notice the order of m, n)
2602 // Vector Multiply [Accumulate/Subtract] [Long] By Scalar Instructions.
2603 // Qd/Dd Qn/Dn RestrictedDm index
2606 static bool DisassembleNVdVnVmOptImm(MCInst &MI, unsigned Opcode, uint32_t insn,
2607 unsigned short NumOps, unsigned &NumOpsAdded, N3VFlag Flag, BO B) {
2609 const TargetInstrDesc &TID = ARMInsts[Opcode];
2610 const TargetOperandInfo *OpInfo = TID.OpInfo;
2612 // No checking for OpInfo[2] because of MOVDneon/MOVQ with only two regs.
2613 assert(NumOps >= 3 &&
2614 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2615 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2616 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2617 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2618 "Expect >= 3 operands and first 2 as reg operands");
2620 unsigned &OpIdx = NumOpsAdded;
2624 bool VdVnVm = Flag == N3V_VectorShift ? false : true;
2625 bool IsImm4 = Flag == N3V_VectorExtract ? true : false;
2626 bool IsDmRestricted = Flag == N3V_Multiply_By_Scalar ? true : false;
2627 ElemSize esize = ESizeNA;
2628 if (Flag == N3V_Multiply_By_Scalar) {
2629 unsigned size = (insn >> 20) & 3;
2630 if (size == 1) esize = ESize16;
2631 if (size == 2) esize = ESize32;
2632 assert (esize == ESize16 || esize == ESize32);
2635 // Qd/Dd = Inst{22:15-12} => NEON Rd
2636 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2637 decodeNEONRd(insn))));
2640 // VABA, VABAL, VBSLd, VBSLq, ...
2641 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2643 MI.addOperand(MCOperand::CreateReg(0));
2647 // Dn = Inst{7:19-16} => NEON Rn
2649 // Dm = Inst{5:3-0} => NEON Rm
2650 MI.addOperand(MCOperand::CreateReg(
2651 getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2652 VdVnVm ? decodeNEONRn(insn)
2653 : decodeNEONRm(insn))));
2656 // Special case handling for VMOVDneon and VMOVQ because they are marked as
2658 if (Opcode == ARM::VMOVDneon || Opcode == ARM::VMOVQ)
2661 // Dm = Inst{5:3-0} => NEON Rm
2663 // Dm is restricted to D0-D7 if size is 16, D0-D15 otherwise
2665 // Dn = Inst{7:19-16} => NEON Rn
2666 unsigned m = VdVnVm ? (IsDmRestricted ? decodeRestrictedDm(insn, esize)
2667 : decodeNEONRm(insn))
2668 : decodeNEONRn(insn);
2670 MI.addOperand(MCOperand::CreateReg(
2671 getRegisterEnum(B, OpInfo[OpIdx].RegClass, m)));
2674 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2675 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2676 // Add the imm operand.
2679 Imm = decodeN3VImm(insn);
2680 else if (IsDmRestricted)
2681 Imm = decodeRestrictedDmIndex(insn, esize);
2683 assert(0 && "Internal error: unreachable code!");
2687 MI.addOperand(MCOperand::CreateImm(Imm));
2694 static bool DisassembleN3RegFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2695 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2697 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2700 static bool DisassembleN3RegVecShFrm(MCInst &MI, unsigned Opcode,
2701 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2703 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2704 N3V_VectorShift, B);
2706 static bool DisassembleNVecExtractFrm(MCInst &MI, unsigned Opcode,
2707 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2709 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2710 N3V_VectorExtract, B);
2712 static bool DisassembleNVecMulScalarFrm(MCInst &MI, unsigned Opcode,
2713 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2715 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2716 N3V_Multiply_By_Scalar, B);
2719 // Vector Table Lookup
2721 // VTBL1, VTBX1: Dd [Dd(TIED_TO)] Dn Dm
2722 // VTBL2, VTBX2: Dd [Dd(TIED_TO)] Dn Dn+1 Dm
2723 // VTBL3, VTBX3: Dd [Dd(TIED_TO)] Dn Dn+1 Dn+2 Dm
2724 // VTBL4, VTBX4: Dd [Dd(TIED_TO)] Dn Dn+1 Dn+2 Dn+3 Dm
2725 static bool DisassembleNVTBLFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2726 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2728 const TargetInstrDesc &TID = ARMInsts[Opcode];
2729 const TargetOperandInfo *OpInfo = TID.OpInfo;
2730 if (!OpInfo) return false;
2732 assert(NumOps >= 3 &&
2733 OpInfo[0].RegClass == ARM::DPRRegClassID &&
2734 OpInfo[1].RegClass == ARM::DPRRegClassID &&
2735 OpInfo[2].RegClass == ARM::DPRRegClassID &&
2736 "Expect >= 3 operands and first 3 as reg operands");
2738 unsigned &OpIdx = NumOpsAdded;
2742 unsigned Rn = decodeNEONRn(insn);
2744 // {Dn} encoded as len = 0b00
2745 // {Dn Dn+1} encoded as len = 0b01
2746 // {Dn Dn+1 Dn+2 } encoded as len = 0b10
2747 // {Dn Dn+1 Dn+2 Dn+3} encoded as len = 0b11
2748 unsigned Len = slice(insn, 9, 8) + 1;
2750 // Dd (the destination vector)
2751 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2752 decodeNEONRd(insn))));
2755 // Process tied_to operand constraint.
2757 if ((Idx = TID.getOperandConstraint(OpIdx, TOI::TIED_TO)) != -1) {
2758 MI.addOperand(MI.getOperand(Idx));
2762 // Do the <list> now.
2763 for (unsigned i = 0; i < Len; ++i) {
2764 assert(OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::DPRRegClassID &&
2765 "Reg operand expected");
2766 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2771 // Dm (the index vector)
2772 assert(OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::DPRRegClassID &&
2773 "Reg operand (index vector) expected");
2774 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2775 decodeNEONRm(insn))));
2781 // Vector Get Lane (move scalar to ARM core register) Instructions.
2782 // VGETLNi32, VGETLNs16, VGETLNs8, VGETLNu16, VGETLNu8: Rt Dn index
2783 static bool DisassembleNGetLnFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2784 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2786 const TargetInstrDesc &TID = ARMInsts[Opcode];
2787 const TargetOperandInfo *OpInfo = TID.OpInfo;
2788 if (!OpInfo) return false;
2790 assert(TID.getNumDefs() == 1 && NumOps >= 3 &&
2791 OpInfo[0].RegClass == ARM::GPRRegClassID &&
2792 OpInfo[1].RegClass == ARM::DPRRegClassID &&
2793 OpInfo[2].RegClass < 0 &&
2794 "Expect >= 3 operands with one dst operand");
2797 Opcode == ARM::VGETLNi32 ? ESize32
2798 : ((Opcode == ARM::VGETLNs16 || Opcode == ARM::VGETLNu16) ? ESize16
2801 // Rt = Inst{15-12} => ARM Rd
2802 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2805 // Dn = Inst{7:19-16} => NEON Rn
2806 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2807 decodeNEONRn(insn))));
2809 MI.addOperand(MCOperand::CreateImm(decodeNVLaneOpIndex(insn, esize)));
2815 // Vector Set Lane (move ARM core register to scalar) Instructions.
2816 // VSETLNi16, VSETLNi32, VSETLNi8: Dd Dd (TIED_TO) Rt index
2817 static bool DisassembleNSetLnFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2818 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2820 const TargetInstrDesc &TID = ARMInsts[Opcode];
2821 const TargetOperandInfo *OpInfo = TID.OpInfo;
2822 if (!OpInfo) return false;
2824 assert(TID.getNumDefs() == 1 && NumOps >= 3 &&
2825 OpInfo[0].RegClass == ARM::DPRRegClassID &&
2826 OpInfo[1].RegClass == ARM::DPRRegClassID &&
2827 TID.getOperandConstraint(1, TOI::TIED_TO) != -1 &&
2828 OpInfo[2].RegClass == ARM::GPRRegClassID &&
2829 OpInfo[3].RegClass < 0 &&
2830 "Expect >= 3 operands with one dst operand");
2833 Opcode == ARM::VSETLNi8 ? ESize8
2834 : (Opcode == ARM::VSETLNi16 ? ESize16
2837 // Dd = Inst{7:19-16} => NEON Rn
2838 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2839 decodeNEONRn(insn))));
2842 MI.addOperand(MCOperand::CreateReg(0));
2844 // Rt = Inst{15-12} => ARM Rd
2845 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2848 MI.addOperand(MCOperand::CreateImm(decodeNVLaneOpIndex(insn, esize)));
2854 // Vector Duplicate Instructions (from ARM core register to all elements).
2855 // VDUP8d, VDUP16d, VDUP32d, VDUP8q, VDUP16q, VDUP32q: Qd/Dd Rt
2856 static bool DisassembleNDupFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2857 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2859 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
2861 assert(NumOps >= 2 &&
2862 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2863 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2864 OpInfo[1].RegClass == ARM::GPRRegClassID &&
2865 "Expect >= 2 operands and first 2 as reg operand");
2867 unsigned RegClass = OpInfo[0].RegClass;
2869 // Qd/Dd = Inst{7:19-16} => NEON Rn
2870 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClass,
2871 decodeNEONRn(insn))));
2873 // Rt = Inst{15-12} => ARM Rd
2874 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2884 static inline bool MemBarrierInstr(uint32_t insn) {
2885 unsigned op7_4 = slice(insn, 7, 4);
2886 if (slice(insn, 31, 8) == 0xf57ff0 && (op7_4 >= 4 && op7_4 <= 6))
2892 static inline bool PreLoadOpcode(unsigned Opcode) {
2894 case ARM::PLDi12: case ARM::PLDrs:
2895 case ARM::PLDWi12: case ARM::PLDWrs:
2896 case ARM::PLIi12: case ARM::PLIrs:
2903 static bool DisassemblePreLoadFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2904 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2906 // Preload Data/Instruction requires either 2 or 3 operands.
2907 // PLDi12, PLDWi12, PLIi12: addrmode_imm12
2908 // PLDrs, PLDWrs, PLIrs: ldst_so_reg
2910 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2913 if (Opcode == ARM::PLDi12 || Opcode == ARM::PLDWi12
2914 || Opcode == ARM::PLIi12) {
2915 unsigned Imm12 = slice(insn, 11, 0);
2916 bool Negative = getUBit(insn) == 0;
2918 // A8.6.118 PLD (literal) PLDWi12 with Rn=PC is transformed to PLDi12.
2919 if (Opcode == ARM::PLDWi12 && slice(insn, 19, 16) == 0xF) {
2920 DEBUG(errs() << "Rn == '1111': PLDWi12 morphed to PLDi12\n");
2921 MI.setOpcode(ARM::PLDi12);
2924 // -0 is represented specially. All other values are as normal.
2925 int Offset = Negative ? -1 * Imm12 : Imm12;
2926 if (Imm12 == 0 && Negative)
2929 MI.addOperand(MCOperand::CreateImm(Offset));
2932 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2935 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
2937 // Inst{6-5} encodes the shift opcode.
2938 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
2939 // Inst{11-7} encodes the imm5 shift amount.
2940 unsigned ShImm = slice(insn, 11, 7);
2942 // A8.4.1. Possible rrx or shift amount of 32...
2943 getImmShiftSE(ShOp, ShImm);
2944 MI.addOperand(MCOperand::CreateImm(
2945 ARM_AM::getAM2Opc(AddrOpcode, ShImm, ShOp)));
2952 static bool DisassembleMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2953 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2955 if (MemBarrierInstr(insn)) {
2956 // DMBsy, DSBsy, and ISBsy instructions have zero operand and are taken care
2957 // of within the generic ARMBasicMCBuilder::BuildIt() method.
2959 // Inst{3-0} encodes the memory barrier option for the variants.
2960 MI.addOperand(MCOperand::CreateImm(slice(insn, 3, 0)));
2976 // SWP, SWPB: Rd Rm Rn
2977 // Delegate to DisassembleLdStExFrm()....
2978 return DisassembleLdStExFrm(MI, Opcode, insn, NumOps, NumOpsAdded, B);
2983 if (Opcode == ARM::SETEND) {
2985 MI.addOperand(MCOperand::CreateImm(slice(insn, 9, 9)));
2989 // FIXME: To enable correct asm parsing and disasm of CPS we need 3 different
2990 // opcodes which match the same real instruction. This is needed since there's
2991 // no current handling of optional arguments. Fix here when a better handling
2992 // of optional arguments is implemented.
2993 if (Opcode == ARM::CPS3p) { // M = 1
2994 // Let's reject these impossible imod values by returning false:
2997 // AsmPrinter cannot handle imod=0b00, plus (imod=0b00,M=1,iflags!=0) is an
2998 // invalid combination, so we just check for imod=0b00 here.
2999 if (slice(insn, 19, 18) == 0 || slice(insn, 19, 18) == 1)
3001 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 18))); // imod
3002 MI.addOperand(MCOperand::CreateImm(slice(insn, 8, 6))); // iflags
3003 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0))); // mode
3007 if (Opcode == ARM::CPS2p) { // mode = 0, M = 0
3008 // Let's reject these impossible imod values by returning false:
3009 // 1. (imod=0b00,M=0)
3011 if (slice(insn, 19, 18) == 0 || slice(insn, 19, 18) == 1)
3013 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 18))); // imod
3014 MI.addOperand(MCOperand::CreateImm(slice(insn, 8, 6))); // iflags
3018 if (Opcode == ARM::CPS1p) { // imod = 0, iflags = 0, M = 1
3019 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0))); // mode
3024 // DBG has its option specified in Inst{3-0}.
3025 if (Opcode == ARM::DBG) {
3026 MI.addOperand(MCOperand::CreateImm(slice(insn, 3, 0)));
3031 // BKPT takes an imm32 val equal to ZeroExtend(Inst{19-8:3-0}).
3032 if (Opcode == ARM::BKPT) {
3033 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 8) << 4 |
3034 slice(insn, 3, 0)));
3039 if (PreLoadOpcode(Opcode))
3040 return DisassemblePreLoadFrm(MI, Opcode, insn, NumOps, NumOpsAdded, B);
3042 assert(0 && "Unexpected misc instruction!");
3046 /// FuncPtrs - FuncPtrs maps ARMFormat to its corresponding DisassembleFP.
3047 /// We divide the disassembly task into different categories, with each one
3048 /// corresponding to a specific instruction encoding format. There could be
3049 /// exceptions when handling a specific format, and that is why the Opcode is
3050 /// also present in the function prototype.
3051 static const DisassembleFP FuncPtrs[] = {
3055 &DisassembleBrMiscFrm,
3057 &DisassembleDPSoRegFrm,
3060 &DisassembleLdMiscFrm,
3061 &DisassembleStMiscFrm,
3062 &DisassembleLdStMulFrm,
3063 &DisassembleLdStExFrm,
3064 &DisassembleArithMiscFrm,
3067 &DisassembleVFPUnaryFrm,
3068 &DisassembleVFPBinaryFrm,
3069 &DisassembleVFPConv1Frm,
3070 &DisassembleVFPConv2Frm,
3071 &DisassembleVFPConv3Frm,
3072 &DisassembleVFPConv4Frm,
3073 &DisassembleVFPConv5Frm,
3074 &DisassembleVFPLdStFrm,
3075 &DisassembleVFPLdStMulFrm,
3076 &DisassembleVFPMiscFrm,
3077 &DisassembleThumbFrm,
3078 &DisassembleMiscFrm,
3079 &DisassembleNGetLnFrm,
3080 &DisassembleNSetLnFrm,
3081 &DisassembleNDupFrm,
3083 // VLD and VST (including one lane) Instructions.
3086 // A7.4.6 One register and a modified immediate value
3087 // 1-Register Instructions with imm.
3088 // LLVM only defines VMOVv instructions.
3089 &DisassembleN1RegModImmFrm,
3091 // 2-Register Instructions with no imm.
3092 &DisassembleN2RegFrm,
3094 // 2-Register Instructions with imm (vector convert float/fixed point).
3095 &DisassembleNVCVTFrm,
3097 // 2-Register Instructions with imm (vector dup lane).
3098 &DisassembleNVecDupLnFrm,
3100 // Vector Shift Left Instructions.
3101 &DisassembleN2RegVecShLFrm,
3103 // Vector Shift Righ Instructions, which has different interpretation of the
3104 // shift amount from the imm6 field.
3105 &DisassembleN2RegVecShRFrm,
3107 // 3-Register Data-Processing Instructions.
3108 &DisassembleN3RegFrm,
3110 // Vector Shift (Register) Instructions.
3111 // D:Vd M:Vm N:Vn (notice that M:Vm is the first operand)
3112 &DisassembleN3RegVecShFrm,
3114 // Vector Extract Instructions.
3115 &DisassembleNVecExtractFrm,
3117 // Vector [Saturating Rounding Doubling] Multiply [Accumulate/Subtract] [Long]
3118 // By Scalar Instructions.
3119 &DisassembleNVecMulScalarFrm,
3121 // Vector Table Lookup uses byte indexes in a control vector to look up byte
3122 // values in a table and generate a new vector.
3123 &DisassembleNVTBLFrm,
3128 /// BuildIt - BuildIt performs the build step for this ARM Basic MC Builder.
3129 /// The general idea is to set the Opcode for the MCInst, followed by adding
3130 /// the appropriate MCOperands to the MCInst. ARM Basic MC Builder delegates
3131 /// to the Format-specific disassemble function for disassembly, followed by
3132 /// TryPredicateAndSBitModifier() to do PredicateOperand and OptionalDefOperand
3133 /// which follow the Dst/Src Operands.
3134 bool ARMBasicMCBuilder::BuildIt(MCInst &MI, uint32_t insn) {
3135 // Stage 1 sets the Opcode.
3136 MI.setOpcode(Opcode);
3137 // If the number of operands is zero, we're done!
3141 // Stage 2 calls the format-specific disassemble function to build the operand
3145 unsigned NumOpsAdded = 0;
3146 bool OK = (*Disasm)(MI, Opcode, insn, NumOps, NumOpsAdded, this);
3148 if (!OK || this->Err != 0) return false;
3149 if (NumOpsAdded >= NumOps)
3152 // Stage 3 deals with operands unaccounted for after stage 2 is finished.
3153 // FIXME: Should this be done selectively?
3154 return TryPredicateAndSBitModifier(MI, Opcode, insn, NumOps - NumOpsAdded);
3157 // A8.3 Conditional execution
3158 // A8.3.1 Pseudocode details of conditional execution
3159 // Condition bits '111x' indicate the instruction is always executed.
3160 static uint32_t CondCode(uint32_t CondField) {
3161 if (CondField == 0xF)
3166 /// DoPredicateOperands - DoPredicateOperands process the predicate operands
3167 /// of some Thumb instructions which come before the reglist operands. It
3168 /// returns true if the two predicate operands have been processed.
3169 bool ARMBasicMCBuilder::DoPredicateOperands(MCInst& MI, unsigned Opcode,
3170 uint32_t /* insn */, unsigned short NumOpsRemaining) {
3172 assert(NumOpsRemaining > 0 && "Invalid argument");
3174 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3175 unsigned Idx = MI.getNumOperands();
3177 // First, we check whether this instr specifies the PredicateOperand through
3178 // a pair of TargetOperandInfos with isPredicate() property.
3179 if (NumOpsRemaining >= 2 &&
3180 OpInfo[Idx].isPredicate() && OpInfo[Idx+1].isPredicate() &&
3181 OpInfo[Idx].RegClass < 0 &&
3182 OpInfo[Idx+1].RegClass == ARM::CCRRegClassID)
3184 // If we are inside an IT block, get the IT condition bits maintained via
3185 // ARMBasicMCBuilder::ITState[7:0], through ARMBasicMCBuilder::GetITCond().
3188 MI.addOperand(MCOperand::CreateImm(GetITCond()));
3190 MI.addOperand(MCOperand::CreateImm(ARMCC::AL));
3191 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
3198 /// TryPredicateAndSBitModifier - TryPredicateAndSBitModifier tries to process
3199 /// the possible Predicate and SBitModifier, to build the remaining MCOperand
3201 bool ARMBasicMCBuilder::TryPredicateAndSBitModifier(MCInst& MI, unsigned Opcode,
3202 uint32_t insn, unsigned short NumOpsRemaining) {
3204 assert(NumOpsRemaining > 0 && "Invalid argument");
3206 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3207 const std::string &Name = ARMInsts[Opcode].Name;
3208 unsigned Idx = MI.getNumOperands();
3210 // First, we check whether this instr specifies the PredicateOperand through
3211 // a pair of TargetOperandInfos with isPredicate() property.
3212 if (NumOpsRemaining >= 2 &&
3213 OpInfo[Idx].isPredicate() && OpInfo[Idx+1].isPredicate() &&
3214 OpInfo[Idx].RegClass < 0 &&
3215 OpInfo[Idx+1].RegClass == ARM::CCRRegClassID)
3217 // If we are inside an IT block, get the IT condition bits maintained via
3218 // ARMBasicMCBuilder::ITState[7:0], through ARMBasicMCBuilder::GetITCond().
3221 MI.addOperand(MCOperand::CreateImm(GetITCond()));
3223 if (Name.length() > 1 && Name[0] == 't') {
3224 // Thumb conditional branch instructions have their cond field embedded,
3228 if (Name == "t2Bcc")
3229 MI.addOperand(MCOperand::CreateImm(CondCode(slice(insn, 25, 22))));
3230 else if (Name == "tBcc")
3231 MI.addOperand(MCOperand::CreateImm(CondCode(slice(insn, 11, 8))));
3233 MI.addOperand(MCOperand::CreateImm(ARMCC::AL));
3235 // ARM instructions get their condition field from Inst{31-28}.
3236 MI.addOperand(MCOperand::CreateImm(CondCode(getCondField(insn))));
3239 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
3241 NumOpsRemaining -= 2;
3244 if (NumOpsRemaining == 0)
3247 // Next, if OptionalDefOperand exists, we check whether the 'S' bit is set.
3248 if (OpInfo[Idx].isOptionalDef() && OpInfo[Idx].RegClass==ARM::CCRRegClassID) {
3249 MI.addOperand(MCOperand::CreateReg(getSBit(insn) == 1 ? ARM::CPSR : 0));
3253 if (NumOpsRemaining == 0)
3259 /// RunBuildAfterHook - RunBuildAfterHook performs operations deemed necessary
3260 /// after BuildIt is finished.
3261 bool ARMBasicMCBuilder::RunBuildAfterHook(bool Status, MCInst &MI,
3264 if (!SP) return Status;
3266 if (Opcode == ARM::t2IT)
3267 Status = SP->InitIT(slice(insn, 7, 0)) ? Status : false;
3268 else if (InITBlock())
3274 /// Opcode, Format, and NumOperands make up an ARM Basic MCBuilder.
3275 ARMBasicMCBuilder::ARMBasicMCBuilder(unsigned opc, ARMFormat format,
3277 : Opcode(opc), Format(format), NumOps(num), SP(0), Err(0) {
3278 unsigned Idx = (unsigned)format;
3279 assert(Idx < (array_lengthof(FuncPtrs) - 1) && "Unknown format");
3280 Disasm = FuncPtrs[Idx];
3283 /// CreateMCBuilder - Return an ARMBasicMCBuilder that can build up the MC
3284 /// infrastructure of an MCInst given the Opcode and Format of the instr.
3285 /// Return NULL if it fails to create/return a proper builder. API clients
3286 /// are responsible for freeing up of the allocated memory. Cacheing can be
3287 /// performed by the API clients to improve performance.
3288 ARMBasicMCBuilder *llvm::CreateMCBuilder(unsigned Opcode, ARMFormat Format) {
3289 // For "Unknown format", fail by returning a NULL pointer.
3290 if ((unsigned)Format >= (array_lengthof(FuncPtrs) - 1)) {
3291 DEBUG(errs() << "Unknown format\n");
3295 return new ARMBasicMCBuilder(Opcode, Format,
3296 ARMInsts[Opcode].getNumOperands());