1 //===- ARMDisassemblerCore.cpp - ARM disassembler helpers -------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file is part of the ARM Disassembler.
11 // It contains code to represent the core concepts of Builder and DisassembleFP
12 // to solve the problem of disassembling an ARM instr.
14 //===----------------------------------------------------------------------===//
16 #define DEBUG_TYPE "arm-disassembler"
18 #include "ARMDisassemblerCore.h"
19 #include "ARMAddressingModes.h"
20 #include "llvm/Support/Debug.h"
21 #include "llvm/Support/raw_ostream.h"
23 //#define DEBUG(X) do { X; } while (0)
25 /// ARMGenInstrInfo.inc - ARMGenInstrInfo.inc contains the static const
26 /// TargetInstrDesc ARMInsts[] definition and the TargetOperandInfo[]'s
27 /// describing the operand info for each ARMInsts[i].
29 /// Together with an instruction's encoding format, we can take advantage of the
30 /// NumOperands and the OpInfo fields of the target instruction description in
31 /// the quest to build out the MCOperand list for an MCInst.
33 /// The general guideline is that with a known format, the number of dst and src
34 /// operands are well-known. The dst is built first, followed by the src
35 /// operand(s). The operands not yet used at this point are for the Implicit
36 /// Uses and Defs by this instr. For the Uses part, the pred:$p operand is
37 /// defined with two components:
39 /// def pred { // Operand PredicateOperand
40 /// ValueType Type = OtherVT;
41 /// string PrintMethod = "printPredicateOperand";
42 /// string AsmOperandLowerMethod = ?;
43 /// dag MIOperandInfo = (ops i32imm, CCR);
44 /// AsmOperandClass ParserMatchClass = ImmAsmOperand;
45 /// dag DefaultOps = (ops (i32 14), (i32 zero_reg));
48 /// which is manifested by the TargetOperandInfo[] of:
50 /// { 0, 0|(1<<TOI::Predicate), 0 },
51 /// { ARM::CCRRegClassID, 0|(1<<TOI::Predicate), 0 }
53 /// So the first predicate MCOperand corresponds to the immediate part of the
54 /// ARM condition field (Inst{31-28}), and the second predicate MCOperand
55 /// corresponds to a register kind of ARM::CPSR.
57 /// For the Defs part, in the simple case of only cc_out:$s, we have:
59 /// def cc_out { // Operand OptionalDefOperand
60 /// ValueType Type = OtherVT;
61 /// string PrintMethod = "printSBitModifierOperand";
62 /// string AsmOperandLowerMethod = ?;
63 /// dag MIOperandInfo = (ops CCR);
64 /// AsmOperandClass ParserMatchClass = ImmAsmOperand;
65 /// dag DefaultOps = (ops (i32 zero_reg));
68 /// which is manifested by the one TargetOperandInfo of:
70 /// { ARM::CCRRegClassID, 0|(1<<TOI::OptionalDef), 0 }
72 /// And this maps to one MCOperand with the regsiter kind of ARM::CPSR.
73 #include "ARMGenInstrInfo.inc"
77 const char *ARMUtils::OpcodeName(unsigned Opcode) {
78 return ARMInsts[Opcode].Name;
81 // Return the register enum Based on RegClass and the raw register number.
84 getRegisterEnum(BO B, unsigned RegClassID, unsigned RawRegister) {
85 // For this purpose, we can treat rGPR as if it were GPR.
86 if (RegClassID == ARM::rGPRRegClassID) RegClassID = ARM::GPRRegClassID;
88 // See also decodeNEONRd(), decodeNEONRn(), decodeNEONRm().
90 RegClassID == ARM::QPRRegClassID ? RawRegister >> 1 : RawRegister;
97 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R0;
98 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
99 case ARM::DPR_VFP2RegClassID:
101 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
102 case ARM::QPR_VFP2RegClassID:
104 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S0;
108 switch (RegClassID) {
109 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R1;
110 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
111 case ARM::DPR_VFP2RegClassID:
113 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
114 case ARM::QPR_VFP2RegClassID:
116 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S1;
120 switch (RegClassID) {
121 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R2;
122 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
123 case ARM::DPR_VFP2RegClassID:
125 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
126 case ARM::QPR_VFP2RegClassID:
128 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S2;
132 switch (RegClassID) {
133 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R3;
134 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
135 case ARM::DPR_VFP2RegClassID:
137 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
138 case ARM::QPR_VFP2RegClassID:
140 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S3;
144 switch (RegClassID) {
145 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R4;
146 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
147 case ARM::DPR_VFP2RegClassID:
149 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q4;
150 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S4;
154 switch (RegClassID) {
155 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R5;
156 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
157 case ARM::DPR_VFP2RegClassID:
159 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q5;
160 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S5;
164 switch (RegClassID) {
165 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R6;
166 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
167 case ARM::DPR_VFP2RegClassID:
169 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q6;
170 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S6;
174 switch (RegClassID) {
175 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R7;
176 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
177 case ARM::DPR_VFP2RegClassID:
179 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q7;
180 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S7;
184 switch (RegClassID) {
185 case ARM::GPRRegClassID: return ARM::R8;
186 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D8;
187 case ARM::QPRRegClassID: return ARM::Q8;
188 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S8;
192 switch (RegClassID) {
193 case ARM::GPRRegClassID: return ARM::R9;
194 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D9;
195 case ARM::QPRRegClassID: return ARM::Q9;
196 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S9;
200 switch (RegClassID) {
201 case ARM::GPRRegClassID: return ARM::R10;
202 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D10;
203 case ARM::QPRRegClassID: return ARM::Q10;
204 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S10;
208 switch (RegClassID) {
209 case ARM::GPRRegClassID: return ARM::R11;
210 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D11;
211 case ARM::QPRRegClassID: return ARM::Q11;
212 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S11;
216 switch (RegClassID) {
217 case ARM::GPRRegClassID: return ARM::R12;
218 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D12;
219 case ARM::QPRRegClassID: return ARM::Q12;
220 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S12;
224 switch (RegClassID) {
225 case ARM::GPRRegClassID: return ARM::SP;
226 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D13;
227 case ARM::QPRRegClassID: return ARM::Q13;
228 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S13;
232 switch (RegClassID) {
233 case ARM::GPRRegClassID: return ARM::LR;
234 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D14;
235 case ARM::QPRRegClassID: return ARM::Q14;
236 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S14;
240 switch (RegClassID) {
241 case ARM::GPRRegClassID: return ARM::PC;
242 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D15;
243 case ARM::QPRRegClassID: return ARM::Q15;
244 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S15;
248 switch (RegClassID) {
249 case ARM::DPRRegClassID: return ARM::D16;
250 case ARM::SPRRegClassID: return ARM::S16;
254 switch (RegClassID) {
255 case ARM::DPRRegClassID: return ARM::D17;
256 case ARM::SPRRegClassID: return ARM::S17;
260 switch (RegClassID) {
261 case ARM::DPRRegClassID: return ARM::D18;
262 case ARM::SPRRegClassID: return ARM::S18;
266 switch (RegClassID) {
267 case ARM::DPRRegClassID: return ARM::D19;
268 case ARM::SPRRegClassID: return ARM::S19;
272 switch (RegClassID) {
273 case ARM::DPRRegClassID: return ARM::D20;
274 case ARM::SPRRegClassID: return ARM::S20;
278 switch (RegClassID) {
279 case ARM::DPRRegClassID: return ARM::D21;
280 case ARM::SPRRegClassID: return ARM::S21;
284 switch (RegClassID) {
285 case ARM::DPRRegClassID: return ARM::D22;
286 case ARM::SPRRegClassID: return ARM::S22;
290 switch (RegClassID) {
291 case ARM::DPRRegClassID: return ARM::D23;
292 case ARM::SPRRegClassID: return ARM::S23;
296 switch (RegClassID) {
297 case ARM::DPRRegClassID: return ARM::D24;
298 case ARM::SPRRegClassID: return ARM::S24;
302 switch (RegClassID) {
303 case ARM::DPRRegClassID: return ARM::D25;
304 case ARM::SPRRegClassID: return ARM::S25;
308 switch (RegClassID) {
309 case ARM::DPRRegClassID: return ARM::D26;
310 case ARM::SPRRegClassID: return ARM::S26;
314 switch (RegClassID) {
315 case ARM::DPRRegClassID: return ARM::D27;
316 case ARM::SPRRegClassID: return ARM::S27;
320 switch (RegClassID) {
321 case ARM::DPRRegClassID: return ARM::D28;
322 case ARM::SPRRegClassID: return ARM::S28;
326 switch (RegClassID) {
327 case ARM::DPRRegClassID: return ARM::D29;
328 case ARM::SPRRegClassID: return ARM::S29;
332 switch (RegClassID) {
333 case ARM::DPRRegClassID: return ARM::D30;
334 case ARM::SPRRegClassID: return ARM::S30;
338 switch (RegClassID) {
339 case ARM::DPRRegClassID: return ARM::D31;
340 case ARM::SPRRegClassID: return ARM::S31;
344 DEBUG(errs() << "Invalid (RegClassID, RawRegister) combination\n");
345 // Encoding error. Mark the builder with error code != 0.
350 ///////////////////////////////
352 // Utility Functions //
354 ///////////////////////////////
356 // Extract/Decode Rd: Inst{15-12}.
357 static inline unsigned decodeRd(uint32_t insn) {
358 return (insn >> ARMII::RegRdShift) & ARMII::GPRRegMask;
361 // Extract/Decode Rn: Inst{19-16}.
362 static inline unsigned decodeRn(uint32_t insn) {
363 return (insn >> ARMII::RegRnShift) & ARMII::GPRRegMask;
366 // Extract/Decode Rm: Inst{3-0}.
367 static inline unsigned decodeRm(uint32_t insn) {
368 return (insn & ARMII::GPRRegMask);
371 // Extract/Decode Rs: Inst{11-8}.
372 static inline unsigned decodeRs(uint32_t insn) {
373 return (insn >> ARMII::RegRsShift) & ARMII::GPRRegMask;
376 static inline unsigned getCondField(uint32_t insn) {
377 return (insn >> ARMII::CondShift);
380 static inline unsigned getIBit(uint32_t insn) {
381 return (insn >> ARMII::I_BitShift) & 1;
384 static inline unsigned getAM3IBit(uint32_t insn) {
385 return (insn >> ARMII::AM3_I_BitShift) & 1;
388 static inline unsigned getPBit(uint32_t insn) {
389 return (insn >> ARMII::P_BitShift) & 1;
392 static inline unsigned getUBit(uint32_t insn) {
393 return (insn >> ARMII::U_BitShift) & 1;
396 static inline unsigned getPUBits(uint32_t insn) {
397 return (insn >> ARMII::U_BitShift) & 3;
400 static inline unsigned getSBit(uint32_t insn) {
401 return (insn >> ARMII::S_BitShift) & 1;
404 static inline unsigned getWBit(uint32_t insn) {
405 return (insn >> ARMII::W_BitShift) & 1;
408 static inline unsigned getDBit(uint32_t insn) {
409 return (insn >> ARMII::D_BitShift) & 1;
412 static inline unsigned getNBit(uint32_t insn) {
413 return (insn >> ARMII::N_BitShift) & 1;
416 static inline unsigned getMBit(uint32_t insn) {
417 return (insn >> ARMII::M_BitShift) & 1;
420 // See A8.4 Shifts applied to a register.
421 // A8.4.2 Register controlled shifts.
423 // getShiftOpcForBits - getShiftOpcForBits translates from the ARM encoding bits
424 // into llvm enums for shift opcode. The API clients should pass in the value
425 // encoded with two bits, so the assert stays to signal a wrong API usage.
427 // A8-12: DecodeRegShift()
428 static inline ARM_AM::ShiftOpc getShiftOpcForBits(unsigned bits) {
430 default: assert(0 && "No such value"); return ARM_AM::no_shift;
431 case 0: return ARM_AM::lsl;
432 case 1: return ARM_AM::lsr;
433 case 2: return ARM_AM::asr;
434 case 3: return ARM_AM::ror;
438 // See A8.4 Shifts applied to a register.
439 // A8.4.1 Constant shifts.
441 // getImmShiftSE - getImmShiftSE translates from the raw ShiftOpc and raw Imm5
442 // encodings into the intended ShiftOpc and shift amount.
444 // A8-11: DecodeImmShift()
445 static inline void getImmShiftSE(ARM_AM::ShiftOpc &ShOp, unsigned &ShImm) {
449 case ARM_AM::no_shift:
453 ShOp = ARM_AM::no_shift;
465 // getAMSubModeForBits - getAMSubModeForBits translates from the ARM encoding
466 // bits Inst{24-23} (P(24) and U(23)) into llvm enums for AMSubMode. The API
467 // clients should pass in the value encoded with two bits, so the assert stays
468 // to signal a wrong API usage.
469 static inline ARM_AM::AMSubMode getAMSubModeForBits(unsigned bits) {
471 default: assert(0 && "No such value"); return ARM_AM::bad_am_submode;
472 case 1: return ARM_AM::ia; // P=0 U=1
473 case 3: return ARM_AM::ib; // P=1 U=1
474 case 0: return ARM_AM::da; // P=0 U=0
475 case 2: return ARM_AM::db; // P=1 U=0
479 ////////////////////////////////////////////
481 // Disassemble function definitions //
483 ////////////////////////////////////////////
485 /// There is a separate Disassemble*Frm function entry for disassembly of an ARM
486 /// instr into a list of MCOperands in the appropriate order, with possible dst,
487 /// followed by possible src(s).
489 /// The processing of the predicate, and the 'S' modifier bit, if MI modifies
490 /// the CPSR, is factored into ARMBasicMCBuilder's method named
491 /// TryPredicateAndSBitModifier.
493 static bool DisassemblePseudo(MCInst &MI, unsigned Opcode, uint32_t insn,
494 unsigned short NumOps, unsigned &NumOpsAdded, BO) {
496 assert(0 && "Unexpected pseudo instruction!");
500 // Multiply Instructions.
501 // MLA, MLS, SMLABB, SMLABT, SMLATB, SMLATT, SMLAWB, SMLAWT, SMMLA, SMMLS:
502 // Rd{19-16} Rn{3-0} Rm{11-8} Ra{15-12}
504 // MUL, SMMUL, SMULBB, SMULBT, SMULTB, SMULTT, SMULWB, SMULWT:
505 // Rd{19-16} Rn{3-0} Rm{11-8}
507 // SMLAL, SMULL, UMAAL, UMLAL, UMULL, SMLALBB, SMLALBT, SMLALTB, SMLALTT:
508 // RdLo{15-12} RdHi{19-16} Rn{3-0} Rm{11-8}
510 // The mapping of the multiply registers to the "regular" ARM registers, where
511 // there are convenience decoder functions, is:
517 static bool DisassembleMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
518 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
520 const TargetInstrDesc &TID = ARMInsts[Opcode];
521 unsigned short NumDefs = TID.getNumDefs();
522 const TargetOperandInfo *OpInfo = TID.OpInfo;
523 unsigned &OpIdx = NumOpsAdded;
527 assert(NumDefs > 0 && "NumDefs should be greater than 0 for MulFrm");
529 && OpInfo[0].RegClass == ARM::GPRRegClassID
530 && OpInfo[1].RegClass == ARM::GPRRegClassID
531 && OpInfo[2].RegClass == ARM::GPRRegClassID
532 && "Expect three register operands");
534 // Instructions with two destination registers have RdLo{15-12} first.
536 assert(NumOps >= 4 && OpInfo[3].RegClass == ARM::GPRRegClassID &&
537 "Expect 4th register operand");
538 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
543 // The destination register: RdHi{19-16} or Rd{19-16}.
544 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
547 // The two src regsiters: Rn{3-0}, then Rm{11-8}.
548 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
550 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
554 // Many multiply instructions (e.g., MLA) have three src registers.
555 // The third register operand is Ra{15-12}.
556 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) {
557 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
565 // Helper routines for disassembly of coprocessor instructions.
567 static bool LdStCopOpcode(unsigned Opcode) {
568 if ((Opcode >= ARM::LDC2L_OFFSET && Opcode <= ARM::LDC_PRE) ||
569 (Opcode >= ARM::STC2L_OFFSET && Opcode <= ARM::STC_PRE))
573 static bool CoprocessorOpcode(unsigned Opcode) {
574 if (LdStCopOpcode(Opcode))
580 case ARM::CDP: case ARM::CDP2:
581 case ARM::MCR: case ARM::MCR2: case ARM::MRC: case ARM::MRC2:
582 case ARM::MCRR: case ARM::MCRR2: case ARM::MRRC: case ARM::MRRC2:
586 static inline unsigned GetCoprocessor(uint32_t insn) {
587 return slice(insn, 11, 8);
589 static inline unsigned GetCopOpc1(uint32_t insn, bool CDP) {
590 return CDP ? slice(insn, 23, 20) : slice(insn, 23, 21);
592 static inline unsigned GetCopOpc2(uint32_t insn) {
593 return slice(insn, 7, 5);
595 static inline unsigned GetCopOpc(uint32_t insn) {
596 return slice(insn, 7, 4);
598 // Most of the operands are in immediate forms, except Rd and Rn, which are ARM
601 // CDP, CDP2: cop opc1 CRd CRn CRm opc2
603 // MCR, MCR2, MRC, MRC2: cop opc1 Rd CRn CRm opc2
605 // MCRR, MCRR2, MRRC, MRRc2: cop opc Rd Rn CRm
607 // LDC_OFFSET, LDC_PRE, LDC_POST: cop CRd Rn R0 [+/-]imm8:00
609 // STC_OFFSET, STC_PRE, STC_POST: cop CRd Rn R0 [+/-]imm8:00
613 // LDC_OPTION: cop CRd Rn imm8
615 // STC_OPTION: cop CRd Rn imm8
618 static bool DisassembleCoprocessor(MCInst &MI, unsigned Opcode, uint32_t insn,
619 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
621 assert(NumOps >= 5 && "Num of operands >= 5 for coprocessor instr");
623 unsigned &OpIdx = NumOpsAdded;
624 bool OneCopOpc = (Opcode == ARM::MCRR || Opcode == ARM::MCRR2 ||
625 Opcode == ARM::MRRC || Opcode == ARM::MRRC2);
626 // CDP/CDP2 has no GPR operand; the opc1 operand is also wider (Inst{23-20}).
627 bool NoGPR = (Opcode == ARM::CDP || Opcode == ARM::CDP2);
628 bool LdStCop = LdStCopOpcode(Opcode);
632 MI.addOperand(MCOperand::CreateImm(GetCoprocessor(insn)));
635 // Unindex if P:W = 0b00 --> _OPTION variant
636 unsigned PW = getPBit(insn) << 1 | getWBit(insn);
638 MI.addOperand(MCOperand::CreateImm(decodeRd(insn)));
640 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
644 MI.addOperand(MCOperand::CreateReg(0));
645 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
646 unsigned Offset = ARM_AM::getAM2Opc(AddrOpcode, slice(insn, 7, 0) << 2,
648 MI.addOperand(MCOperand::CreateImm(Offset));
651 MI.addOperand(MCOperand::CreateImm(slice(insn, 7, 0)));
655 MI.addOperand(MCOperand::CreateImm(OneCopOpc ? GetCopOpc(insn)
656 : GetCopOpc1(insn, NoGPR)));
658 MI.addOperand(NoGPR ? MCOperand::CreateImm(decodeRd(insn))
659 : MCOperand::CreateReg(
660 getRegisterEnum(B, ARM::GPRRegClassID,
663 MI.addOperand(OneCopOpc ? MCOperand::CreateReg(
664 getRegisterEnum(B, ARM::GPRRegClassID,
666 : MCOperand::CreateImm(decodeRn(insn)));
668 MI.addOperand(MCOperand::CreateImm(decodeRm(insn)));
673 MI.addOperand(MCOperand::CreateImm(GetCopOpc2(insn)));
681 // Branch Instructions.
682 // BLr9: SignExtend(Imm24:'00', 32)
683 // Bcc, BLr9_pred: SignExtend(Imm24:'00', 32) Pred0 Pred1
684 // SMC: ZeroExtend(imm4, 32)
685 // SVC: ZeroExtend(Imm24, 32)
687 // Various coprocessor instructions are assigned BrFrm arbitrarily.
688 // Delegates to DisassembleCoprocessor() helper function.
691 // MSR/MSRsys: Rm mask=Inst{19-16}
693 // MSRi/MSRsysi: so_imm
694 // SRSW/SRS: addrmode4:$addr mode_imm
695 // RFEW/RFE: addrmode4:$addr Rn
696 static bool DisassembleBrFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
697 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
699 if (CoprocessorOpcode(Opcode))
700 return DisassembleCoprocessor(MI, Opcode, insn, NumOps, NumOpsAdded, B);
702 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
703 if (!OpInfo) return false;
705 // MRS and MRSsys take one GPR reg Rd.
706 if (Opcode == ARM::MRS || Opcode == ARM::MRSsys) {
707 assert(NumOps >= 1 && OpInfo[0].RegClass == ARM::GPRRegClassID &&
708 "Reg operand expected");
709 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
714 // BXJ takes one GPR reg Rm.
715 if (Opcode == ARM::BXJ) {
716 assert(NumOps >= 1 && OpInfo[0].RegClass == ARM::GPRRegClassID &&
717 "Reg operand expected");
718 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
723 // MSR and MSRsys take one GPR reg Rm, followed by the mask.
724 if (Opcode == ARM::MSR || Opcode == ARM::MSRsys) {
725 assert(NumOps >= 1 && OpInfo[0].RegClass == ARM::GPRRegClassID &&
726 "Reg operand expected");
727 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
729 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 16)));
733 // MSRi and MSRsysi take one so_imm operand, followed by the mask.
734 if (Opcode == ARM::MSRi || Opcode == ARM::MSRsysi) {
735 // SOImm is 4-bit rotate amount in bits 11-8 with 8-bit imm in bits 7-0.
736 // A5.2.4 Rotate amount is twice the numeric value of Inst{11-8}.
737 // See also ARMAddressingModes.h: getSOImmValImm() and getSOImmValRot().
738 unsigned Rot = (insn >> ARMII::SoRotImmShift) & 0xF;
739 unsigned Imm = insn & 0xFF;
740 MI.addOperand(MCOperand::CreateImm(ARM_AM::rotr32(Imm, 2*Rot)));
741 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 16)));
745 // SRSW and SRS requires addrmode4:$addr for ${addr:submode}, followed by the
746 // mode immediate (Inst{4-0}).
747 if (Opcode == ARM::SRSW || Opcode == ARM::SRS ||
748 Opcode == ARM::RFEW || Opcode == ARM::RFE) {
749 // ARMInstPrinter::printAddrMode4Operand() prints special mode string
750 // if the base register is SP; so don't set ARM::SP.
751 MI.addOperand(MCOperand::CreateReg(0));
752 ARM_AM::AMSubMode SubMode = getAMSubModeForBits(getPUBits(insn));
753 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM4ModeImm(SubMode)));
755 if (Opcode == ARM::SRSW || Opcode == ARM::SRS)
756 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0)));
758 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
764 assert((Opcode == ARM::Bcc || Opcode == ARM::BLr9 || Opcode == ARM::BLr9_pred
765 || Opcode == ARM::SMC || Opcode == ARM::SVC) &&
766 "Unexpected Opcode");
768 assert(NumOps >= 1 && OpInfo[0].RegClass < 0 && "Reg operand expected");
771 if (Opcode == ARM::SMC) {
772 // ZeroExtend(imm4, 32) where imm24 = Inst{3-0}.
773 Imm32 = slice(insn, 3, 0);
774 } else if (Opcode == ARM::SVC) {
775 // ZeroExtend(imm24, 32) where imm24 = Inst{23-0}.
776 Imm32 = slice(insn, 23, 0);
778 // SignExtend(imm24:'00', 32) where imm24 = Inst{23-0}.
779 unsigned Imm26 = slice(insn, 23, 0) << 2;
780 //Imm32 = signextend<signed int, 26>(Imm26);
781 Imm32 = SignExtend32<26>(Imm26);
783 // When executing an ARM instruction, PC reads as the address of the current
784 // instruction plus 8. The assembler subtracts 8 from the difference
785 // between the branch instruction and the target address, disassembler has
786 // to add 8 to compensate.
790 MI.addOperand(MCOperand::CreateImm(Imm32));
796 // Misc. Branch Instructions.
797 // BR_JTadd, BR_JTr, BR_JTm
800 static bool DisassembleBrMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
801 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
803 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
804 if (!OpInfo) return false;
806 unsigned &OpIdx = NumOpsAdded;
810 // BX_RET has only two predicate operands, do an early return.
811 if (Opcode == ARM::BX_RET)
814 // BLXr9 and BRIND take one GPR reg.
815 if (Opcode == ARM::BLXr9 || Opcode == ARM::BRIND) {
816 assert(NumOps >= 1 && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
817 "Reg operand expected");
818 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
824 // BR_JTadd is an ADD with Rd = PC, (Rn, Rm) as the target and index regs.
825 if (Opcode == ARM::BR_JTadd) {
826 // InOperandList with GPR:$target and GPR:$idx regs.
828 assert(NumOps == 4 && "Expect 4 operands");
829 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
831 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
834 // Fill in the two remaining imm operands to signify build completion.
835 MI.addOperand(MCOperand::CreateImm(0));
836 MI.addOperand(MCOperand::CreateImm(0));
842 // BR_JTr is a MOV with Rd = PC, and Rm as the source register.
843 if (Opcode == ARM::BR_JTr) {
844 // InOperandList with GPR::$target reg.
846 assert(NumOps == 3 && "Expect 3 operands");
847 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
850 // Fill in the two remaining imm operands to signify build completion.
851 MI.addOperand(MCOperand::CreateImm(0));
852 MI.addOperand(MCOperand::CreateImm(0));
858 // BR_JTm is an LDR with Rt = PC.
859 if (Opcode == ARM::BR_JTm) {
860 // This is the reg/reg form, with base reg followed by +/- reg shop imm.
861 // See also ARMAddressingModes.h (Addressing Mode #2).
863 assert(NumOps == 5 && getIBit(insn) == 1 && "Expect 5 operands && I-bit=1");
864 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
867 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
869 // Disassemble the offset reg (Rm), shift type, and immediate shift length.
870 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
872 // Inst{6-5} encodes the shift opcode.
873 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
874 // Inst{11-7} encodes the imm5 shift amount.
875 unsigned ShImm = slice(insn, 11, 7);
877 // A8.4.1. Possible rrx or shift amount of 32...
878 getImmShiftSE(ShOp, ShImm);
879 MI.addOperand(MCOperand::CreateImm(
880 ARM_AM::getAM2Opc(AddrOpcode, ShImm, ShOp)));
882 // Fill in the two remaining imm operands to signify build completion.
883 MI.addOperand(MCOperand::CreateImm(0));
884 MI.addOperand(MCOperand::CreateImm(0));
893 static inline bool getBFCInvMask(uint32_t insn, uint32_t &mask) {
894 uint32_t lsb = slice(insn, 11, 7);
895 uint32_t msb = slice(insn, 20, 16);
898 DEBUG(errs() << "Encoding error: msb < lsb\n");
902 for (uint32_t i = lsb; i <= msb; ++i)
908 // A major complication is the fact that some of the saturating add/subtract
909 // operations have Rd Rm Rn, instead of the "normal" Rd Rn Rm.
910 // They are QADD, QDADD, QDSUB, and QSUB.
911 static bool DisassembleDPFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
912 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
914 const TargetInstrDesc &TID = ARMInsts[Opcode];
915 unsigned short NumDefs = TID.getNumDefs();
916 bool isUnary = isUnaryDP(TID.TSFlags);
917 const TargetOperandInfo *OpInfo = TID.OpInfo;
918 unsigned &OpIdx = NumOpsAdded;
922 // Disassemble register def if there is one.
923 if (NumDefs && (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID)) {
924 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
929 // Now disassemble the src operands.
933 // Special-case handling of BFC/BFI/SBFX/UBFX.
934 if (Opcode == ARM::BFC || Opcode == ARM::BFI) {
935 MI.addOperand(MCOperand::CreateReg(0));
936 if (Opcode == ARM::BFI) {
937 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
942 if (!getBFCInvMask(insn, mask))
945 MI.addOperand(MCOperand::CreateImm(mask));
949 if (Opcode == ARM::SBFX || Opcode == ARM::UBFX) {
950 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
952 MI.addOperand(MCOperand::CreateImm(slice(insn, 11, 7)));
953 MI.addOperand(MCOperand::CreateImm(slice(insn, 20, 16) + 1));
958 bool RmRn = (Opcode == ARM::QADD || Opcode == ARM::QDADD ||
959 Opcode == ARM::QDSUB || Opcode == ARM::QSUB);
961 // BinaryDP has an Rn operand.
963 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
964 "Reg operand expected");
965 MI.addOperand(MCOperand::CreateReg(
966 getRegisterEnum(B, ARM::GPRRegClassID,
967 RmRn ? decodeRm(insn) : decodeRn(insn))));
971 // If this is a two-address operand, skip it, e.g., MOVCCr operand 1.
972 if (isUnary && (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)) {
973 MI.addOperand(MCOperand::CreateReg(0));
977 // Now disassemble operand 2.
981 if (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) {
982 // We have a reg/reg form.
983 // Assert disabled because saturating operations, e.g., A8.6.127 QASX, are
984 // routed here as well.
985 // assert(getIBit(insn) == 0 && "I_Bit != '0' reg/reg form");
986 MI.addOperand(MCOperand::CreateReg(
987 getRegisterEnum(B, ARM::GPRRegClassID,
988 RmRn? decodeRn(insn) : decodeRm(insn))));
990 } else if (Opcode == ARM::MOVi16 || Opcode == ARM::MOVTi16) {
991 // We have an imm16 = imm4:imm12 (imm4=Inst{19:16}, imm12 = Inst{11:0}).
992 assert(getIBit(insn) == 1 && "I_Bit != '1' reg/imm form");
993 unsigned Imm16 = slice(insn, 19, 16) << 12 | slice(insn, 11, 0);
994 MI.addOperand(MCOperand::CreateImm(Imm16));
997 // We have a reg/imm form.
998 // SOImm is 4-bit rotate amount in bits 11-8 with 8-bit imm in bits 7-0.
999 // A5.2.4 Rotate amount is twice the numeric value of Inst{11-8}.
1000 // See also ARMAddressingModes.h: getSOImmValImm() and getSOImmValRot().
1001 assert(getIBit(insn) == 1 && "I_Bit != '1' reg/imm form");
1002 unsigned Rot = (insn >> ARMII::SoRotImmShift) & 0xF;
1003 unsigned Imm = insn & 0xFF;
1004 MI.addOperand(MCOperand::CreateImm(ARM_AM::rotr32(Imm, 2*Rot)));
1011 static bool DisassembleDPSoRegFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1012 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1014 const TargetInstrDesc &TID = ARMInsts[Opcode];
1015 unsigned short NumDefs = TID.getNumDefs();
1016 bool isUnary = isUnaryDP(TID.TSFlags);
1017 const TargetOperandInfo *OpInfo = TID.OpInfo;
1018 unsigned &OpIdx = NumOpsAdded;
1022 // Disassemble register def if there is one.
1023 if (NumDefs && (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID)) {
1024 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1029 // Disassemble the src operands.
1030 if (OpIdx >= NumOps)
1033 // BinaryDP has an Rn operand.
1035 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1036 "Reg operand expected");
1037 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1042 // If this is a two-address operand, skip it, e.g., MOVCCs operand 1.
1043 if (isUnary && (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)) {
1044 MI.addOperand(MCOperand::CreateReg(0));
1048 // Disassemble operand 2, which consists of three components.
1049 if (OpIdx + 2 >= NumOps)
1052 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
1053 (OpInfo[OpIdx+1].RegClass == ARM::GPRRegClassID) &&
1054 (OpInfo[OpIdx+2].RegClass < 0) &&
1055 "Expect 3 reg operands");
1057 // Register-controlled shifts have Inst{7} = 0 and Inst{4} = 1.
1058 unsigned Rs = slice(insn, 4, 4);
1060 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1063 // Register-controlled shifts: [Rm, Rs, shift].
1064 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1066 // Inst{6-5} encodes the shift opcode.
1067 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1068 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(ShOp, 0)));
1070 // Constant shifts: [Rm, reg0, shift_imm].
1071 MI.addOperand(MCOperand::CreateReg(0)); // NoRegister
1072 // Inst{6-5} encodes the shift opcode.
1073 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1074 // Inst{11-7} encodes the imm5 shift amount.
1075 unsigned ShImm = slice(insn, 11, 7);
1077 // A8.4.1. Possible rrx or shift amount of 32...
1078 getImmShiftSE(ShOp, ShImm);
1079 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(ShOp, ShImm)));
1086 static bool DisassembleLdStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1087 unsigned short NumOps, unsigned &NumOpsAdded, bool isStore, BO B) {
1089 const TargetInstrDesc &TID = ARMInsts[Opcode];
1090 bool isPrePost = isPrePostLdSt(TID.TSFlags);
1091 const TargetOperandInfo *OpInfo = TID.OpInfo;
1092 if (!OpInfo) return false;
1094 unsigned &OpIdx = NumOpsAdded;
1098 assert(((!isStore && TID.getNumDefs() > 0) ||
1099 (isStore && (TID.getNumDefs() == 0 || isPrePost)))
1100 && "Invalid arguments");
1102 // Operand 0 of a pre- and post-indexed store is the address base writeback.
1103 if (isPrePost && isStore) {
1104 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1105 "Reg operand expected");
1106 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1111 // Disassemble the dst/src operand.
1112 if (OpIdx >= NumOps)
1115 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1116 "Reg operand expected");
1117 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1121 // After dst of a pre- and post-indexed load is the address base writeback.
1122 if (isPrePost && !isStore) {
1123 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1124 "Reg operand expected");
1125 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1130 // Disassemble the base operand.
1131 if (OpIdx >= NumOps)
1134 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1135 "Reg operand expected");
1136 assert((!isPrePost || (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1))
1137 && "Index mode or tied_to operand expected");
1138 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1142 // For reg/reg form, base reg is followed by +/- reg shop imm.
1143 // For immediate form, it is followed by +/- imm12.
1144 // See also ARMAddressingModes.h (Addressing Mode #2).
1145 if (OpIdx + 1 >= NumOps)
1148 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
1149 (OpInfo[OpIdx+1].RegClass < 0) &&
1150 "Expect 1 reg operand followed by 1 imm operand");
1152 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1153 if (getIBit(insn) == 0) {
1154 MI.addOperand(MCOperand::CreateReg(0));
1156 // Disassemble the 12-bit immediate offset.
1157 unsigned Imm12 = slice(insn, 11, 0);
1158 unsigned Offset = ARM_AM::getAM2Opc(AddrOpcode, Imm12, ARM_AM::no_shift);
1159 MI.addOperand(MCOperand::CreateImm(Offset));
1161 // Disassemble the offset reg (Rm), shift type, and immediate shift length.
1162 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1164 // Inst{6-5} encodes the shift opcode.
1165 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1166 // Inst{11-7} encodes the imm5 shift amount.
1167 unsigned ShImm = slice(insn, 11, 7);
1169 // A8.4.1. Possible rrx or shift amount of 32...
1170 getImmShiftSE(ShOp, ShImm);
1171 MI.addOperand(MCOperand::CreateImm(
1172 ARM_AM::getAM2Opc(AddrOpcode, ShImm, ShOp)));
1179 static bool DisassembleLdFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1180 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1181 return DisassembleLdStFrm(MI, Opcode, insn, NumOps, NumOpsAdded, false, B);
1184 static bool DisassembleStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1185 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1186 return DisassembleLdStFrm(MI, Opcode, insn, NumOps, NumOpsAdded, true, B);
1189 static bool HasDualReg(unsigned Opcode) {
1193 case ARM::LDRD: case ARM::LDRD_PRE: case ARM::LDRD_POST:
1194 case ARM::STRD: case ARM::STRD_PRE: case ARM::STRD_POST:
1199 static bool DisassembleLdStMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1200 unsigned short NumOps, unsigned &NumOpsAdded, bool isStore, BO B) {
1202 const TargetInstrDesc &TID = ARMInsts[Opcode];
1203 bool isPrePost = isPrePostLdSt(TID.TSFlags);
1204 const TargetOperandInfo *OpInfo = TID.OpInfo;
1205 if (!OpInfo) return false;
1207 unsigned &OpIdx = NumOpsAdded;
1211 assert(((!isStore && TID.getNumDefs() > 0) ||
1212 (isStore && (TID.getNumDefs() == 0 || isPrePost)))
1213 && "Invalid arguments");
1215 // Operand 0 of a pre- and post-indexed store is the address base writeback.
1216 if (isPrePost && isStore) {
1217 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1218 "Reg operand expected");
1219 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1224 bool DualReg = HasDualReg(Opcode);
1226 // Disassemble the dst/src operand.
1227 if (OpIdx >= NumOps)
1230 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1231 "Reg operand expected");
1232 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1236 // Fill in LDRD and STRD's second operand.
1238 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1239 decodeRd(insn) + 1)));
1243 // After dst of a pre- and post-indexed load is the address base writeback.
1244 if (isPrePost && !isStore) {
1245 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1246 "Reg operand expected");
1247 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1252 // Disassemble the base operand.
1253 if (OpIdx >= NumOps)
1256 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1257 "Reg operand expected");
1258 assert((!isPrePost || (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1))
1259 && "Index mode or tied_to operand expected");
1260 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1264 // For reg/reg form, base reg is followed by +/- reg.
1265 // For immediate form, it is followed by +/- imm8.
1266 // See also ARMAddressingModes.h (Addressing Mode #3).
1267 if (OpIdx + 1 >= NumOps)
1270 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
1271 (OpInfo[OpIdx+1].RegClass < 0) &&
1272 "Expect 1 reg operand followed by 1 imm operand");
1274 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1275 if (getAM3IBit(insn) == 1) {
1276 MI.addOperand(MCOperand::CreateReg(0));
1278 // Disassemble the 8-bit immediate offset.
1279 unsigned Imm4H = (insn >> ARMII::ImmHiShift) & 0xF;
1280 unsigned Imm4L = insn & 0xF;
1281 unsigned Offset = ARM_AM::getAM3Opc(AddrOpcode, (Imm4H << 4) | Imm4L);
1282 MI.addOperand(MCOperand::CreateImm(Offset));
1284 // Disassemble the offset reg (Rm).
1285 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1287 unsigned Offset = ARM_AM::getAM3Opc(AddrOpcode, 0);
1288 MI.addOperand(MCOperand::CreateImm(Offset));
1295 static bool DisassembleLdMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1296 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1297 return DisassembleLdStMiscFrm(MI, Opcode, insn, NumOps, NumOpsAdded, false,
1301 static bool DisassembleStMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1302 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1303 return DisassembleLdStMiscFrm(MI, Opcode, insn, NumOps, NumOpsAdded, true, B);
1306 // The algorithm for disassembly of LdStMulFrm is different from others because
1307 // it explicitly populates the two predicate operands after operand 0 (the base)
1308 // and operand 1 (the AM4 mode imm). After operand 3, we need to populate the
1309 // reglist with each affected register encoded as an MCOperand.
1310 static bool DisassembleLdStMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1311 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1313 assert(NumOps >= 5 && "LdStMulFrm expects NumOps >= 5");
1315 unsigned &OpIdx = NumOpsAdded;
1319 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1321 // Writeback to base, if necessary.
1322 if (Opcode == ARM::LDM_UPD || Opcode == ARM::STM_UPD) {
1323 MI.addOperand(MCOperand::CreateReg(Base));
1327 MI.addOperand(MCOperand::CreateReg(Base));
1329 ARM_AM::AMSubMode SubMode = getAMSubModeForBits(getPUBits(insn));
1330 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM4ModeImm(SubMode)));
1332 // Handling the two predicate operands before the reglist.
1333 int64_t CondVal = insn >> ARMII::CondShift;
1334 MI.addOperand(MCOperand::CreateImm(CondVal == 0xF ? 0xE : CondVal));
1335 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
1339 // Fill the variadic part of reglist.
1340 unsigned RegListBits = insn & ((1 << 16) - 1);
1341 for (unsigned i = 0; i < 16; ++i) {
1342 if ((RegListBits >> i) & 1) {
1343 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1352 // LDREX, LDREXB, LDREXH: Rd Rn
1353 // LDREXD: Rd Rd+1 Rn
1354 // STREX, STREXB, STREXH: Rd Rm Rn
1355 // STREXD: Rd Rm Rm+1 Rn
1357 // SWP, SWPB: Rd Rm Rn
1358 static bool DisassembleLdStExFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1359 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1361 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1362 if (!OpInfo) return false;
1364 unsigned &OpIdx = NumOpsAdded;
1369 && OpInfo[0].RegClass == ARM::GPRRegClassID
1370 && OpInfo[1].RegClass == ARM::GPRRegClassID
1371 && "Expect 2 reg operands");
1373 bool isStore = slice(insn, 20, 20) == 0;
1374 bool isDW = (Opcode == ARM::LDREXD || Opcode == ARM::STREXD);
1376 // Add the destination operand.
1377 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1381 // Store register Exclusive needs a source operand.
1383 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1388 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1389 decodeRm(insn)+1)));
1393 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1394 decodeRd(insn)+1)));
1398 // Finally add the pointer operand.
1399 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1406 // Misc. Arithmetic Instructions.
1408 // PKHBT, PKHTB: Rd Rn Rm , LSL/ASR #imm5
1409 // RBIT, REV, REV16, REVSH: Rd Rm
1410 static bool DisassembleArithMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1411 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1413 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1414 unsigned &OpIdx = NumOpsAdded;
1419 && OpInfo[0].RegClass == ARM::GPRRegClassID
1420 && OpInfo[1].RegClass == ARM::GPRRegClassID
1421 && "Expect 2 reg operands");
1423 bool ThreeReg = NumOps > 2 && OpInfo[2].RegClass == ARM::GPRRegClassID;
1425 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1430 assert(NumOps >= 4 && "Expect >= 4 operands");
1431 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1436 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1440 // If there is still an operand info left which is an immediate operand, add
1441 // an additional imm5 LSL/ASR operand.
1442 if (ThreeReg && OpInfo[OpIdx].RegClass < 0
1443 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1444 // Extract the 5-bit immediate field Inst{11-7}.
1445 unsigned ShiftAmt = (insn >> ARMII::ShiftShift) & 0x1F;
1446 ARM_AM::ShiftOpc Opc = ARM_AM::no_shift;
1447 if (Opcode == ARM::PKHBT)
1449 else if (Opcode == ARM::PKHBT)
1451 getImmShiftSE(Opc, ShiftAmt);
1452 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(Opc, ShiftAmt)));
1459 /// DisassembleSatFrm - Disassemble saturate instructions:
1460 /// SSAT, SSAT16, USAT, and USAT16.
1461 static bool DisassembleSatFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1462 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1464 const TargetInstrDesc &TID = ARMInsts[Opcode];
1465 NumOpsAdded = TID.getNumOperands() - 2; // ignore predicate operands
1467 // Disassemble register def.
1468 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1471 unsigned Pos = slice(insn, 20, 16);
1472 if (Opcode == ARM::SSAT || Opcode == ARM::SSAT16)
1474 MI.addOperand(MCOperand::CreateImm(Pos));
1476 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1479 if (NumOpsAdded == 4) {
1480 ARM_AM::ShiftOpc Opc = (slice(insn, 6, 6) != 0 ? ARM_AM::asr : ARM_AM::lsl);
1481 // Inst{11-7} encodes the imm5 shift amount.
1482 unsigned ShAmt = slice(insn, 11, 7);
1484 // A8.6.183. Possible ASR shift amount of 32...
1485 if (Opc == ARM_AM::asr)
1488 Opc = ARM_AM::no_shift;
1490 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(Opc, ShAmt)));
1495 // Extend instructions.
1496 // SXT* and UXT*: Rd [Rn] Rm [rot_imm].
1497 // The 2nd operand register is Rn and the 3rd operand regsiter is Rm for the
1498 // three register operand form. Otherwise, Rn=0b1111 and only Rm is used.
1499 static bool DisassembleExtFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1500 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1502 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1503 unsigned &OpIdx = NumOpsAdded;
1508 && OpInfo[0].RegClass == ARM::GPRRegClassID
1509 && OpInfo[1].RegClass == ARM::GPRRegClassID
1510 && "Expect 2 reg operands");
1512 bool ThreeReg = NumOps > 2 && OpInfo[2].RegClass == ARM::GPRRegClassID;
1514 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1519 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1524 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1528 // If there is still an operand info left which is an immediate operand, add
1529 // an additional rotate immediate operand.
1530 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
1531 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1532 // Extract the 2-bit rotate field Inst{11-10}.
1533 unsigned rot = (insn >> ARMII::ExtRotImmShift) & 3;
1534 // Rotation by 8, 16, or 24 bits.
1535 MI.addOperand(MCOperand::CreateImm(rot << 3));
1542 /////////////////////////////////////
1544 // Utility Functions For VFP //
1546 /////////////////////////////////////
1548 // Extract/Decode Dd/Sd:
1550 // SP => d = UInt(Vd:D)
1551 // DP => d = UInt(D:Vd)
1552 static unsigned decodeVFPRd(uint32_t insn, bool isSPVFP) {
1553 return isSPVFP ? (decodeRd(insn) << 1 | getDBit(insn))
1554 : (decodeRd(insn) | getDBit(insn) << 4);
1557 // Extract/Decode Dn/Sn:
1559 // SP => n = UInt(Vn:N)
1560 // DP => n = UInt(N:Vn)
1561 static unsigned decodeVFPRn(uint32_t insn, bool isSPVFP) {
1562 return isSPVFP ? (decodeRn(insn) << 1 | getNBit(insn))
1563 : (decodeRn(insn) | getNBit(insn) << 4);
1566 // Extract/Decode Dm/Sm:
1568 // SP => m = UInt(Vm:M)
1569 // DP => m = UInt(M:Vm)
1570 static unsigned decodeVFPRm(uint32_t insn, bool isSPVFP) {
1571 return isSPVFP ? (decodeRm(insn) << 1 | getMBit(insn))
1572 : (decodeRm(insn) | getMBit(insn) << 4);
1576 static APInt VFPExpandImm(unsigned char byte, unsigned N) {
1577 assert(N == 32 || N == 64);
1580 unsigned bit6 = slice(byte, 6, 6);
1582 Result = slice(byte, 7, 7) << 31 | slice(byte, 5, 0) << 19;
1584 Result |= 0x1f << 25;
1586 Result |= 0x1 << 30;
1588 Result = (uint64_t)slice(byte, 7, 7) << 63 |
1589 (uint64_t)slice(byte, 5, 0) << 48;
1591 Result |= 0xffL << 54;
1593 Result |= 0x1L << 62;
1595 return APInt(N, Result);
1598 // VFP Unary Format Instructions:
1600 // VCMP[E]ZD, VCMP[E]ZS: compares one floating-point register with zero
1601 // VCVTDS, VCVTSD: converts between double-precision and single-precision
1602 // The rest of the instructions have homogeneous [VFP]Rd and [VFP]Rm registers.
1603 static bool DisassembleVFPUnaryFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1604 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1606 assert(NumOps >= 1 && "VFPUnaryFrm expects NumOps >= 1");
1608 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1609 unsigned &OpIdx = NumOpsAdded;
1613 unsigned RegClass = OpInfo[OpIdx].RegClass;
1614 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1615 "Reg operand expected");
1616 bool isSP = (RegClass == ARM::SPRRegClassID);
1618 MI.addOperand(MCOperand::CreateReg(
1619 getRegisterEnum(B, RegClass, decodeVFPRd(insn, isSP))));
1622 // Early return for compare with zero instructions.
1623 if (Opcode == ARM::VCMPEZD || Opcode == ARM::VCMPEZS
1624 || Opcode == ARM::VCMPZD || Opcode == ARM::VCMPZS)
1627 RegClass = OpInfo[OpIdx].RegClass;
1628 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1629 "Reg operand expected");
1630 isSP = (RegClass == ARM::SPRRegClassID);
1632 MI.addOperand(MCOperand::CreateReg(
1633 getRegisterEnum(B, RegClass, decodeVFPRm(insn, isSP))));
1639 // All the instructions have homogeneous [VFP]Rd, [VFP]Rn, and [VFP]Rm regs.
1640 // Some of them have operand constraints which tie the first operand in the
1641 // InOperandList to that of the dst. As far as asm printing is concerned, this
1642 // tied_to operand is simply skipped.
1643 static bool DisassembleVFPBinaryFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1644 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1646 assert(NumOps >= 3 && "VFPBinaryFrm expects NumOps >= 3");
1648 const TargetInstrDesc &TID = ARMInsts[Opcode];
1649 const TargetOperandInfo *OpInfo = TID.OpInfo;
1650 unsigned &OpIdx = NumOpsAdded;
1654 unsigned RegClass = OpInfo[OpIdx].RegClass;
1655 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1656 "Reg operand expected");
1657 bool isSP = (RegClass == ARM::SPRRegClassID);
1659 MI.addOperand(MCOperand::CreateReg(
1660 getRegisterEnum(B, RegClass, decodeVFPRd(insn, isSP))));
1663 // Skip tied_to operand constraint.
1664 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
1665 assert(NumOps >= 4 && "Expect >=4 operands");
1666 MI.addOperand(MCOperand::CreateReg(0));
1670 MI.addOperand(MCOperand::CreateReg(
1671 getRegisterEnum(B, RegClass, decodeVFPRn(insn, isSP))));
1674 MI.addOperand(MCOperand::CreateReg(
1675 getRegisterEnum(B, RegClass, decodeVFPRm(insn, isSP))));
1681 // A8.6.295 vcvt (floating-point <-> integer)
1682 // Int to FP: VSITOD, VSITOS, VUITOD, VUITOS
1683 // FP to Int: VTOSI[Z|R]D, VTOSI[Z|R]S, VTOUI[Z|R]D, VTOUI[Z|R]S
1685 // A8.6.297 vcvt (floating-point and fixed-point)
1686 // Dd|Sd Dd|Sd(TIED_TO) #fbits(= 16|32 - UInt(imm4:i))
1687 static bool DisassembleVFPConv1Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1688 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1690 assert(NumOps >= 2 && "VFPConv1Frm expects NumOps >= 2");
1692 const TargetInstrDesc &TID = ARMInsts[Opcode];
1693 const TargetOperandInfo *OpInfo = TID.OpInfo;
1694 if (!OpInfo) return false;
1696 bool SP = slice(insn, 8, 8) == 0; // A8.6.295 & A8.6.297
1697 bool fixed_point = slice(insn, 17, 17) == 1; // A8.6.297
1698 unsigned RegClassID = SP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1702 assert(NumOps >= 3 && "Expect >= 3 operands");
1703 int size = slice(insn, 7, 7) == 0 ? 16 : 32;
1704 int fbits = size - (slice(insn,3,0) << 1 | slice(insn,5,5));
1705 MI.addOperand(MCOperand::CreateReg(
1706 getRegisterEnum(B, RegClassID,
1707 decodeVFPRd(insn, SP))));
1709 assert(TID.getOperandConstraint(1, TOI::TIED_TO) != -1 &&
1710 "Tied to operand expected");
1711 MI.addOperand(MI.getOperand(0));
1713 assert(OpInfo[2].RegClass < 0 && !OpInfo[2].isPredicate() &&
1714 !OpInfo[2].isOptionalDef() && "Imm operand expected");
1715 MI.addOperand(MCOperand::CreateImm(fbits));
1720 // The Rd (destination) and Rm (source) bits have different interpretations
1721 // depending on their single-precisonness.
1723 if (slice(insn, 18, 18) == 1) { // to_integer operation
1724 d = decodeVFPRd(insn, true /* Is Single Precision */);
1725 MI.addOperand(MCOperand::CreateReg(
1726 getRegisterEnum(B, ARM::SPRRegClassID, d)));
1727 m = decodeVFPRm(insn, SP);
1728 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, m)));
1730 d = decodeVFPRd(insn, SP);
1731 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, d)));
1732 m = decodeVFPRm(insn, true /* Is Single Precision */);
1733 MI.addOperand(MCOperand::CreateReg(
1734 getRegisterEnum(B, ARM::SPRRegClassID, m)));
1742 // VMOVRS - A8.6.330
1743 // Rt => Rd; Sn => UInt(Vn:N)
1744 static bool DisassembleVFPConv2Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1745 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1747 assert(NumOps >= 2 && "VFPConv2Frm expects NumOps >= 2");
1749 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1751 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1752 decodeVFPRn(insn, true))));
1757 // VMOVRRD - A8.6.332
1758 // Rt => Rd; Rt2 => Rn; Dm => UInt(M:Vm)
1760 // VMOVRRS - A8.6.331
1761 // Rt => Rd; Rt2 => Rn; Sm => UInt(Vm:M); Sm1 = Sm+1
1762 static bool DisassembleVFPConv3Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1763 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1765 assert(NumOps >= 3 && "VFPConv3Frm expects NumOps >= 3");
1767 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1768 unsigned &OpIdx = NumOpsAdded;
1770 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1772 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1776 if (OpInfo[OpIdx].RegClass == ARM::SPRRegClassID) {
1777 unsigned Sm = decodeVFPRm(insn, true);
1778 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1780 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1784 MI.addOperand(MCOperand::CreateReg(
1785 getRegisterEnum(B, ARM::DPRRegClassID,
1786 decodeVFPRm(insn, false))));
1792 // VMOVSR - A8.6.330
1793 // Rt => Rd; Sn => UInt(Vn:N)
1794 static bool DisassembleVFPConv4Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1795 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1797 assert(NumOps >= 2 && "VFPConv4Frm expects NumOps >= 2");
1799 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1800 decodeVFPRn(insn, true))));
1801 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1807 // VMOVDRR - A8.6.332
1808 // Rt => Rd; Rt2 => Rn; Dm => UInt(M:Vm)
1810 // VMOVRRS - A8.6.331
1811 // Rt => Rd; Rt2 => Rn; Sm => UInt(Vm:M); Sm1 = Sm+1
1812 static bool DisassembleVFPConv5Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1813 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1815 assert(NumOps >= 3 && "VFPConv5Frm expects NumOps >= 3");
1817 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1818 unsigned &OpIdx = NumOpsAdded;
1822 if (OpInfo[OpIdx].RegClass == ARM::SPRRegClassID) {
1823 unsigned Sm = decodeVFPRm(insn, true);
1824 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1826 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1830 MI.addOperand(MCOperand::CreateReg(
1831 getRegisterEnum(B, ARM::DPRRegClassID,
1832 decodeVFPRm(insn, false))));
1836 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1838 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1844 // VFP Load/Store Instructions.
1845 // VLDRD, VLDRS, VSTRD, VSTRS
1846 static bool DisassembleVFPLdStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1847 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1849 assert(NumOps >= 3 && "VFPLdStFrm expects NumOps >= 3");
1851 bool isSPVFP = (Opcode == ARM::VLDRS || Opcode == ARM::VSTRS);
1852 unsigned RegClassID = isSPVFP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1854 // Extract Dd/Sd for operand 0.
1855 unsigned RegD = decodeVFPRd(insn, isSPVFP);
1857 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, RegD)));
1859 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1860 MI.addOperand(MCOperand::CreateReg(Base));
1862 // Next comes the AM5 Opcode.
1863 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1864 unsigned char Imm8 = insn & 0xFF;
1865 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(AddrOpcode, Imm8)));
1872 // VFP Load/Store Multiple Instructions.
1873 // This is similar to the algorithm for LDM/STM in that operand 0 (the base) and
1874 // operand 1 (the AM4 mode imm) is followed by two predicate operands. It is
1875 // followed by a reglist of either DPR(s) or SPR(s).
1877 // VLDMD[_UPD], VLDMS[_UPD], VSTMD[_UPD], VSTMS[_UPD]
1878 static bool DisassembleVFPLdStMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1879 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1881 assert(NumOps >= 5 && "VFPLdStMulFrm expects NumOps >= 5");
1883 unsigned &OpIdx = NumOpsAdded;
1887 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1889 // Writeback to base, if necessary.
1890 if (Opcode == ARM::VLDMD_UPD || Opcode == ARM::VLDMS_UPD ||
1891 Opcode == ARM::VSTMD_UPD || Opcode == ARM::VSTMS_UPD) {
1892 MI.addOperand(MCOperand::CreateReg(Base));
1896 MI.addOperand(MCOperand::CreateReg(Base));
1898 // Next comes the AM4 Opcode.
1899 ARM_AM::AMSubMode SubMode = getAMSubModeForBits(getPUBits(insn));
1900 // Must be either "ia" or "db" submode.
1901 if (SubMode != ARM_AM::ia && SubMode != ARM_AM::db) {
1902 DEBUG(errs() << "Illegal addressing mode 4 sub-mode!\n");
1905 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM4ModeImm(SubMode)));
1907 // Handling the two predicate operands before the reglist.
1908 int64_t CondVal = insn >> ARMII::CondShift;
1909 MI.addOperand(MCOperand::CreateImm(CondVal == 0xF ? 0xE : CondVal));
1910 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
1914 bool isSPVFP = (Opcode == ARM::VLDMS || Opcode == ARM::VLDMS_UPD ||
1915 Opcode == ARM::VSTMS || Opcode == ARM::VSTMS_UPD);
1916 unsigned RegClassID = isSPVFP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1919 unsigned RegD = decodeVFPRd(insn, isSPVFP);
1921 // Fill the variadic part of reglist.
1922 unsigned char Imm8 = insn & 0xFF;
1923 unsigned Regs = isSPVFP ? Imm8 : Imm8/2;
1924 for (unsigned i = 0; i < Regs; ++i) {
1925 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID,
1933 // Misc. VFP Instructions.
1934 // FMSTAT (vmrs with Rt=0b1111, i.e., to apsr_nzcv and no register operand)
1935 // FCONSTD (DPR and a VFPf64Imm operand)
1936 // FCONSTS (SPR and a VFPf32Imm operand)
1937 // VMRS/VMSR (GPR operand)
1938 static bool DisassembleVFPMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1939 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1941 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1942 unsigned &OpIdx = NumOpsAdded;
1946 if (Opcode == ARM::FMSTAT)
1949 assert(NumOps >= 2 && "VFPMiscFrm expects >=2 operands");
1951 unsigned RegEnum = 0;
1952 switch (OpInfo[0].RegClass) {
1953 case ARM::DPRRegClassID:
1954 RegEnum = getRegisterEnum(B, ARM::DPRRegClassID, decodeVFPRd(insn, false));
1956 case ARM::SPRRegClassID:
1957 RegEnum = getRegisterEnum(B, ARM::SPRRegClassID, decodeVFPRd(insn, true));
1959 case ARM::GPRRegClassID:
1960 RegEnum = getRegisterEnum(B, ARM::GPRRegClassID, decodeRd(insn));
1963 assert(0 && "Invalid reg class id");
1967 MI.addOperand(MCOperand::CreateReg(RegEnum));
1970 // Extract/decode the f64/f32 immediate.
1971 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
1972 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1973 // The asm syntax specifies the floating point value, not the 8-bit literal.
1974 APInt immRaw = VFPExpandImm(slice(insn,19,16) << 4 | slice(insn, 3, 0),
1975 Opcode == ARM::FCONSTD ? 64 : 32);
1976 MI.addOperand(MCOperand::CreateFPImm(APFloat(immRaw, true)));
1984 // DisassembleThumbFrm() is defined in ThumbDisassemblerCore.h file.
1985 #include "ThumbDisassemblerCore.h"
1987 /////////////////////////////////////////////////////
1989 // Utility Functions For ARM Advanced SIMD //
1991 /////////////////////////////////////////////////////
1993 // The following NEON namings are based on A8.6.266 VABA, VABAL. Notice that
1994 // A8.6.303 VDUP (ARM core register)'s D/Vd pair is the N/Vn pair of VABA/VABAL.
1996 // A7.3 Register encoding
1998 // Extract/Decode NEON D/Vd:
2000 // Note that for quadword, Qd = UInt(D:Vd<3:1>) = Inst{22:15-13}, whereas for
2001 // doubleword, Dd = UInt(D:Vd). We compensate for this difference by
2002 // handling it in the getRegisterEnum() utility function.
2003 // D = Inst{22}, Vd = Inst{15-12}
2004 static unsigned decodeNEONRd(uint32_t insn) {
2005 return ((insn >> ARMII::NEON_D_BitShift) & 1) << 4
2006 | ((insn >> ARMII::NEON_RegRdShift) & ARMII::NEONRegMask);
2009 // Extract/Decode NEON N/Vn:
2011 // Note that for quadword, Qn = UInt(N:Vn<3:1>) = Inst{7:19-17}, whereas for
2012 // doubleword, Dn = UInt(N:Vn). We compensate for this difference by
2013 // handling it in the getRegisterEnum() utility function.
2014 // N = Inst{7}, Vn = Inst{19-16}
2015 static unsigned decodeNEONRn(uint32_t insn) {
2016 return ((insn >> ARMII::NEON_N_BitShift) & 1) << 4
2017 | ((insn >> ARMII::NEON_RegRnShift) & ARMII::NEONRegMask);
2020 // Extract/Decode NEON M/Vm:
2022 // Note that for quadword, Qm = UInt(M:Vm<3:1>) = Inst{5:3-1}, whereas for
2023 // doubleword, Dm = UInt(M:Vm). We compensate for this difference by
2024 // handling it in the getRegisterEnum() utility function.
2025 // M = Inst{5}, Vm = Inst{3-0}
2026 static unsigned decodeNEONRm(uint32_t insn) {
2027 return ((insn >> ARMII::NEON_M_BitShift) & 1) << 4
2028 | ((insn >> ARMII::NEON_RegRmShift) & ARMII::NEONRegMask);
2039 } // End of unnamed namespace
2041 // size field -> Inst{11-10}
2042 // index_align field -> Inst{7-4}
2044 // The Lane Index interpretation depends on the Data Size:
2045 // 8 (encoded as size = 0b00) -> Index = index_align[3:1]
2046 // 16 (encoded as size = 0b01) -> Index = index_align[3:2]
2047 // 32 (encoded as size = 0b10) -> Index = index_align[3]
2049 // Ref: A8.6.317 VLD4 (single 4-element structure to one lane).
2050 static unsigned decodeLaneIndex(uint32_t insn) {
2051 unsigned size = insn >> 10 & 3;
2052 assert((size == 0 || size == 1 || size == 2) &&
2053 "Encoding error: size should be either 0, 1, or 2");
2055 unsigned index_align = insn >> 4 & 0xF;
2056 return (index_align >> 1) >> size;
2059 // imm64 = AdvSIMDExpandImm(op, cmode, i:imm3:imm4)
2060 // op = Inst{5}, cmode = Inst{11-8}
2061 // i = Inst{24} (ARM architecture)
2062 // imm3 = Inst{18-16}, imm4 = Inst{3-0}
2063 // Ref: Table A7-15 Modified immediate values for Advanced SIMD instructions.
2064 static uint64_t decodeN1VImm(uint32_t insn, ElemSize esize) {
2065 unsigned char op = (insn >> 5) & 1;
2066 unsigned char cmode = (insn >> 8) & 0xF;
2067 unsigned char Imm8 = ((insn >> 24) & 1) << 7 |
2068 ((insn >> 16) & 7) << 4 |
2070 return (op << 12) | (cmode << 8) | Imm8;
2073 // A8.6.339 VMUL, VMULL (by scalar)
2074 // ESize16 => m = Inst{2-0} (Vm<2:0>) D0-D7
2075 // ESize32 => m = Inst{3-0} (Vm<3:0>) D0-D15
2076 static unsigned decodeRestrictedDm(uint32_t insn, ElemSize esize) {
2083 assert(0 && "Unreachable code!");
2088 // A8.6.339 VMUL, VMULL (by scalar)
2089 // ESize16 => index = Inst{5:3} (M:Vm<3>) D0-D7
2090 // ESize32 => index = Inst{5} (M) D0-D15
2091 static unsigned decodeRestrictedDmIndex(uint32_t insn, ElemSize esize) {
2094 return (((insn >> 5) & 1) << 1) | ((insn >> 3) & 1);
2096 return (insn >> 5) & 1;
2098 assert(0 && "Unreachable code!");
2103 // A8.6.296 VCVT (between floating-point and fixed-point, Advanced SIMD)
2104 // (64 - <fbits>) is encoded as imm6, i.e., Inst{21-16}.
2105 static unsigned decodeVCVTFractionBits(uint32_t insn) {
2106 return 64 - ((insn >> 16) & 0x3F);
2109 // A8.6.302 VDUP (scalar)
2110 // ESize8 => index = Inst{19-17}
2111 // ESize16 => index = Inst{19-18}
2112 // ESize32 => index = Inst{19}
2113 static unsigned decodeNVLaneDupIndex(uint32_t insn, ElemSize esize) {
2116 return (insn >> 17) & 7;
2118 return (insn >> 18) & 3;
2120 return (insn >> 19) & 1;
2122 assert(0 && "Unspecified element size!");
2127 // A8.6.328 VMOV (ARM core register to scalar)
2128 // A8.6.329 VMOV (scalar to ARM core register)
2129 // ESize8 => index = Inst{21:6-5}
2130 // ESize16 => index = Inst{21:6}
2131 // ESize32 => index = Inst{21}
2132 static unsigned decodeNVLaneOpIndex(uint32_t insn, ElemSize esize) {
2135 return ((insn >> 21) & 1) << 2 | ((insn >> 5) & 3);
2137 return ((insn >> 21) & 1) << 1 | ((insn >> 6) & 1);
2139 return ((insn >> 21) & 1);
2141 assert(0 && "Unspecified element size!");
2146 // Imm6 = Inst{21-16}, L = Inst{7}
2148 // LeftShift == true (A8.6.367 VQSHL, A8.6.387 VSLI):
2150 // '0001xxx' => esize = 8; shift_amount = imm6 - 8
2151 // '001xxxx' => esize = 16; shift_amount = imm6 - 16
2152 // '01xxxxx' => esize = 32; shift_amount = imm6 - 32
2153 // '1xxxxxx' => esize = 64; shift_amount = imm6
2155 // LeftShift == false (A8.6.376 VRSHR, A8.6.368 VQSHRN):
2157 // '0001xxx' => esize = 8; shift_amount = 16 - imm6
2158 // '001xxxx' => esize = 16; shift_amount = 32 - imm6
2159 // '01xxxxx' => esize = 32; shift_amount = 64 - imm6
2160 // '1xxxxxx' => esize = 64; shift_amount = 64 - imm6
2162 static unsigned decodeNVSAmt(uint32_t insn, bool LeftShift) {
2163 ElemSize esize = ESizeNA;
2164 unsigned L = (insn >> 7) & 1;
2165 unsigned imm6 = (insn >> 16) & 0x3F;
2169 else if (imm6 >> 4 == 1)
2171 else if (imm6 >> 5 == 1)
2174 assert(0 && "Wrong encoding of Inst{7:21-16}!");
2179 return esize == ESize64 ? imm6 : (imm6 - esize);
2181 return esize == ESize64 ? (esize - imm6) : (2*esize - imm6);
2185 // Imm4 = Inst{11-8}
2186 static unsigned decodeN3VImm(uint32_t insn) {
2187 return (insn >> 8) & 0xF;
2191 // D[d] D[d2] ... Rn [TIED_TO Rn] align [Rm]
2193 // D[d] D[d2] ... Rn [TIED_TO Rn] align [Rm] TIED_TO ... imm(idx)
2195 // Rn [TIED_TO Rn] align [Rm] D[d] D[d2] ...
2197 // Rn [TIED_TO Rn] align [Rm] D[d] D[d2] ... [imm(idx)]
2199 // Correctly set VLD*/VST*'s TIED_TO GPR, as the asm printer needs it.
2200 static bool DisassembleNLdSt0(MCInst &MI, unsigned Opcode, uint32_t insn,
2201 unsigned short NumOps, unsigned &NumOpsAdded, bool Store, bool DblSpaced,
2204 const TargetInstrDesc &TID = ARMInsts[Opcode];
2205 const TargetOperandInfo *OpInfo = TID.OpInfo;
2207 // At least one DPR register plus addressing mode #6.
2208 assert(NumOps >= 3 && "Expect >= 3 operands");
2210 unsigned &OpIdx = NumOpsAdded;
2214 // We have homogeneous NEON registers for Load/Store.
2215 unsigned RegClass = 0;
2217 // Double-spaced registers have increments of 2.
2218 unsigned Inc = DblSpaced ? 2 : 1;
2220 unsigned Rn = decodeRn(insn);
2221 unsigned Rm = decodeRm(insn);
2222 unsigned Rd = decodeNEONRd(insn);
2224 // A7.7.1 Advanced SIMD addressing mode.
2227 // LLVM Addressing Mode #6.
2228 unsigned RmEnum = 0;
2230 RmEnum = getRegisterEnum(B, ARM::GPRRegClassID, Rm);
2233 // Consume possible WB, AddrMode6, possible increment reg, the DPR/QPR's,
2234 // then possible lane index.
2235 assert(OpIdx < NumOps && OpInfo[0].RegClass == ARM::GPRRegClassID &&
2236 "Reg operand expected");
2239 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2244 assert((OpIdx+1) < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
2245 OpInfo[OpIdx + 1].RegClass < 0 && "Addrmode #6 Operands expected");
2246 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2248 MI.addOperand(MCOperand::CreateImm(0)); // Alignment ignored?
2252 MI.addOperand(MCOperand::CreateReg(RmEnum));
2256 assert(OpIdx < NumOps &&
2257 (OpInfo[OpIdx].RegClass == ARM::DPRRegClassID ||
2258 OpInfo[OpIdx].RegClass == ARM::QPRRegClassID) &&
2259 "Reg operand expected");
2261 RegClass = OpInfo[OpIdx].RegClass;
2262 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2263 MI.addOperand(MCOperand::CreateReg(
2264 getRegisterEnum(B, RegClass, Rd)));
2269 // Handle possible lane index.
2270 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2271 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2272 MI.addOperand(MCOperand::CreateImm(decodeLaneIndex(insn)));
2277 // Consume the DPR/QPR's, possible WB, AddrMode6, possible incrment reg,
2278 // possible TIED_TO DPR/QPR's (ignored), then possible lane index.
2279 RegClass = OpInfo[0].RegClass;
2281 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2282 MI.addOperand(MCOperand::CreateReg(
2283 getRegisterEnum(B, RegClass, Rd)));
2289 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2294 assert((OpIdx+1) < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
2295 OpInfo[OpIdx + 1].RegClass < 0 && "Addrmode #6 Operands expected");
2296 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2298 MI.addOperand(MCOperand::CreateImm(0)); // Alignment ignored?
2302 MI.addOperand(MCOperand::CreateReg(RmEnum));
2306 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2307 assert(TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1 &&
2308 "Tied to operand expected");
2309 MI.addOperand(MCOperand::CreateReg(0));
2313 // Handle possible lane index.
2314 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2315 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2316 MI.addOperand(MCOperand::CreateImm(decodeLaneIndex(insn)));
2321 // Accessing registers past the end of the NEON register file is not
2330 // If L (Inst{21}) == 0, store instructions.
2331 // Find out about double-spaced-ness of the Opcode and pass it on to
2332 // DisassembleNLdSt0().
2333 static bool DisassembleNLdSt(MCInst &MI, unsigned Opcode, uint32_t insn,
2334 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2336 const StringRef Name = ARMInsts[Opcode].Name;
2337 bool DblSpaced = false;
2339 if (Name.find("LN") != std::string::npos) {
2340 // To one lane instructions.
2341 // See, for example, 8.6.317 VLD4 (single 4-element structure to one lane).
2343 // <size> == 16 && Inst{5} == 1 --> DblSpaced = true
2344 if (Name.endswith("16") || Name.endswith("16_UPD"))
2345 DblSpaced = slice(insn, 5, 5) == 1;
2347 // <size> == 32 && Inst{6} == 1 --> DblSpaced = true
2348 if (Name.endswith("32") || Name.endswith("32_UPD"))
2349 DblSpaced = slice(insn, 6, 6) == 1;
2352 // Multiple n-element structures with type encoded as Inst{11-8}.
2353 // See, for example, A8.6.316 VLD4 (multiple 4-element structures).
2355 // n == 2 && type == 0b1001 -> DblSpaced = true
2356 if (Name.startswith("VST2") || Name.startswith("VLD2"))
2357 DblSpaced = slice(insn, 11, 8) == 9;
2359 // n == 3 && type == 0b0101 -> DblSpaced = true
2360 if (Name.startswith("VST3") || Name.startswith("VLD3"))
2361 DblSpaced = slice(insn, 11, 8) == 5;
2363 // n == 4 && type == 0b0001 -> DblSpaced = true
2364 if (Name.startswith("VST4") || Name.startswith("VLD4"))
2365 DblSpaced = slice(insn, 11, 8) == 1;
2368 return DisassembleNLdSt0(MI, Opcode, insn, NumOps, NumOpsAdded,
2369 slice(insn, 21, 21) == 0, DblSpaced, B);
2374 static bool DisassembleN1RegModImmFrm(MCInst &MI, unsigned Opcode,
2375 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2377 const TargetInstrDesc &TID = ARMInsts[Opcode];
2378 const TargetOperandInfo *OpInfo = TID.OpInfo;
2380 assert(NumOps >= 2 &&
2381 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2382 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2383 (OpInfo[1].RegClass < 0) &&
2384 "Expect 1 reg operand followed by 1 imm operand");
2386 // Qd/Dd = Inst{22:15-12} => NEON Rd
2387 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[0].RegClass,
2388 decodeNEONRd(insn))));
2390 ElemSize esize = ESizeNA;
2393 case ARM::VMOVv16i8:
2396 case ARM::VMOVv4i16:
2397 case ARM::VMOVv8i16:
2398 case ARM::VMVNv4i16:
2399 case ARM::VMVNv8i16:
2402 case ARM::VMOVv2i32:
2403 case ARM::VMOVv4i32:
2404 case ARM::VMVNv2i32:
2405 case ARM::VMVNv4i32:
2408 case ARM::VMOVv1i64:
2409 case ARM::VMOVv2i64:
2413 assert(0 && "Unreachable code!");
2417 // One register and a modified immediate value.
2418 // Add the imm operand.
2419 MI.addOperand(MCOperand::CreateImm(decodeN1VImm(insn, esize)));
2429 N2V_VectorConvert_Between_Float_Fixed
2431 } // End of unnamed namespace
2433 // Vector Convert [between floating-point and fixed-point]
2434 // Qd/Dd Qm/Dm [fbits]
2436 // Vector Duplicate Lane (from scalar to all elements) Instructions.
2437 // VDUPLN16d, VDUPLN16q, VDUPLN32d, VDUPLN32q, VDUPLN8d, VDUPLN8q:
2440 // Vector Move Long:
2443 // Vector Move Narrow:
2447 static bool DisassembleNVdVmOptImm(MCInst &MI, unsigned Opc, uint32_t insn,
2448 unsigned short NumOps, unsigned &NumOpsAdded, N2VFlag Flag, BO B) {
2450 const TargetInstrDesc &TID = ARMInsts[Opc];
2451 const TargetOperandInfo *OpInfo = TID.OpInfo;
2453 assert(NumOps >= 2 &&
2454 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2455 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2456 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2457 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2458 "Expect >= 2 operands and first 2 as reg operands");
2460 unsigned &OpIdx = NumOpsAdded;
2464 ElemSize esize = ESizeNA;
2465 if (Flag == N2V_VectorDupLane) {
2466 // VDUPLN has its index embedded. Its size can be inferred from the Opcode.
2467 assert(Opc >= ARM::VDUPLN16d && Opc <= ARM::VDUPLN8q &&
2468 "Unexpected Opcode");
2469 esize = (Opc == ARM::VDUPLN8d || Opc == ARM::VDUPLN8q) ? ESize8
2470 : ((Opc == ARM::VDUPLN16d || Opc == ARM::VDUPLN16q) ? ESize16
2474 // Qd/Dd = Inst{22:15-12} => NEON Rd
2475 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2476 decodeNEONRd(insn))));
2480 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2482 MI.addOperand(MCOperand::CreateReg(0));
2486 // Dm = Inst{5:3-0} => NEON Rm
2487 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2488 decodeNEONRm(insn))));
2491 // VZIP and others have two TIED_TO reg operands.
2493 while (OpIdx < NumOps &&
2494 (Idx = TID.getOperandConstraint(OpIdx, TOI::TIED_TO)) != -1) {
2495 // Add TIED_TO operand.
2496 MI.addOperand(MI.getOperand(Idx));
2500 // Add the imm operand, if required.
2501 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2502 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2504 unsigned imm = 0xFFFFFFFF;
2506 if (Flag == N2V_VectorDupLane)
2507 imm = decodeNVLaneDupIndex(insn, esize);
2508 if (Flag == N2V_VectorConvert_Between_Float_Fixed)
2509 imm = decodeVCVTFractionBits(insn);
2511 assert(imm != 0xFFFFFFFF && "Internal error");
2512 MI.addOperand(MCOperand::CreateImm(imm));
2519 static bool DisassembleN2RegFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2520 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2522 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2525 static bool DisassembleNVCVTFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2526 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2528 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2529 N2V_VectorConvert_Between_Float_Fixed, B);
2531 static bool DisassembleNVecDupLnFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2532 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2534 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2535 N2V_VectorDupLane, B);
2538 // Vector Shift [Accumulate] Instructions.
2539 // Qd/Dd [Qd/Dd (TIED_TO)] Qm/Dm ShiftAmt
2541 // Vector Shift Left Long (with maximum shift count) Instructions.
2542 // VSHLLi16, VSHLLi32, VSHLLi8: Qd Dm imm (== size)
2544 static bool DisassembleNVectorShift(MCInst &MI, unsigned Opcode, uint32_t insn,
2545 unsigned short NumOps, unsigned &NumOpsAdded, bool LeftShift, BO B) {
2547 const TargetInstrDesc &TID = ARMInsts[Opcode];
2548 const TargetOperandInfo *OpInfo = TID.OpInfo;
2550 assert(NumOps >= 3 &&
2551 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2552 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2553 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2554 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2555 "Expect >= 3 operands and first 2 as reg operands");
2557 unsigned &OpIdx = NumOpsAdded;
2561 // Qd/Dd = Inst{22:15-12} => NEON Rd
2562 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2563 decodeNEONRd(insn))));
2566 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2568 MI.addOperand(MCOperand::CreateReg(0));
2572 assert((OpInfo[OpIdx].RegClass == ARM::DPRRegClassID ||
2573 OpInfo[OpIdx].RegClass == ARM::QPRRegClassID) &&
2574 "Reg operand expected");
2576 // Qm/Dm = Inst{5:3-0} => NEON Rm
2577 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2578 decodeNEONRm(insn))));
2581 assert(OpInfo[OpIdx].RegClass < 0 && "Imm operand expected");
2583 // Add the imm operand.
2585 // VSHLL has maximum shift count as the imm, inferred from its size.
2589 Imm = decodeNVSAmt(insn, LeftShift);
2601 MI.addOperand(MCOperand::CreateImm(Imm));
2607 // Left shift instructions.
2608 static bool DisassembleN2RegVecShLFrm(MCInst &MI, unsigned Opcode,
2609 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2611 return DisassembleNVectorShift(MI, Opcode, insn, NumOps, NumOpsAdded, true,
2614 // Right shift instructions have different shift amount interpretation.
2615 static bool DisassembleN2RegVecShRFrm(MCInst &MI, unsigned Opcode,
2616 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2618 return DisassembleNVectorShift(MI, Opcode, insn, NumOps, NumOpsAdded, false,
2627 N3V_Multiply_By_Scalar
2629 } // End of unnamed namespace
2631 // NEON Three Register Instructions with Optional Immediate Operand
2633 // Vector Extract Instructions.
2634 // Qd/Dd Qn/Dn Qm/Dm imm4
2636 // Vector Shift (Register) Instructions.
2637 // Qd/Dd Qm/Dm Qn/Dn (notice the order of m, n)
2639 // Vector Multiply [Accumulate/Subtract] [Long] By Scalar Instructions.
2640 // Qd/Dd Qn/Dn RestrictedDm index
2643 static bool DisassembleNVdVnVmOptImm(MCInst &MI, unsigned Opcode, uint32_t insn,
2644 unsigned short NumOps, unsigned &NumOpsAdded, N3VFlag Flag, BO B) {
2646 const TargetInstrDesc &TID = ARMInsts[Opcode];
2647 const TargetOperandInfo *OpInfo = TID.OpInfo;
2649 // No checking for OpInfo[2] because of MOVDneon/MOVQ with only two regs.
2650 assert(NumOps >= 3 &&
2651 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2652 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2653 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2654 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2655 "Expect >= 3 operands and first 2 as reg operands");
2657 unsigned &OpIdx = NumOpsAdded;
2661 bool VdVnVm = Flag == N3V_VectorShift ? false : true;
2662 bool IsImm4 = Flag == N3V_VectorExtract ? true : false;
2663 bool IsDmRestricted = Flag == N3V_Multiply_By_Scalar ? true : false;
2664 ElemSize esize = ESizeNA;
2665 if (Flag == N3V_Multiply_By_Scalar) {
2666 unsigned size = (insn >> 20) & 3;
2667 if (size == 1) esize = ESize16;
2668 if (size == 2) esize = ESize32;
2669 assert (esize == ESize16 || esize == ESize32);
2672 // Qd/Dd = Inst{22:15-12} => NEON Rd
2673 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2674 decodeNEONRd(insn))));
2677 // VABA, VABAL, VBSLd, VBSLq, ...
2678 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2680 MI.addOperand(MCOperand::CreateReg(0));
2684 // Dn = Inst{7:19-16} => NEON Rn
2686 // Dm = Inst{5:3-0} => NEON Rm
2687 MI.addOperand(MCOperand::CreateReg(
2688 getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2689 VdVnVm ? decodeNEONRn(insn)
2690 : decodeNEONRm(insn))));
2693 // Special case handling for VMOVDneon and VMOVQ because they are marked as
2695 if (Opcode == ARM::VMOVDneon || Opcode == ARM::VMOVQ)
2698 // Dm = Inst{5:3-0} => NEON Rm
2700 // Dm is restricted to D0-D7 if size is 16, D0-D15 otherwise
2702 // Dn = Inst{7:19-16} => NEON Rn
2703 unsigned m = VdVnVm ? (IsDmRestricted ? decodeRestrictedDm(insn, esize)
2704 : decodeNEONRm(insn))
2705 : decodeNEONRn(insn);
2707 MI.addOperand(MCOperand::CreateReg(
2708 getRegisterEnum(B, OpInfo[OpIdx].RegClass, m)));
2711 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2712 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2713 // Add the imm operand.
2716 Imm = decodeN3VImm(insn);
2717 else if (IsDmRestricted)
2718 Imm = decodeRestrictedDmIndex(insn, esize);
2720 assert(0 && "Internal error: unreachable code!");
2724 MI.addOperand(MCOperand::CreateImm(Imm));
2731 static bool DisassembleN3RegFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2732 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2734 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2737 static bool DisassembleN3RegVecShFrm(MCInst &MI, unsigned Opcode,
2738 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2740 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2741 N3V_VectorShift, B);
2743 static bool DisassembleNVecExtractFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2744 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2746 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2747 N3V_VectorExtract, B);
2749 static bool DisassembleNVecMulScalarFrm(MCInst &MI, unsigned Opcode,
2750 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2752 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2753 N3V_Multiply_By_Scalar, B);
2756 // Vector Table Lookup
2758 // VTBL1, VTBX1: Dd [Dd(TIED_TO)] Dn Dm
2759 // VTBL2, VTBX2: Dd [Dd(TIED_TO)] Dn Dn+1 Dm
2760 // VTBL3, VTBX3: Dd [Dd(TIED_TO)] Dn Dn+1 Dn+2 Dm
2761 // VTBL4, VTBX4: Dd [Dd(TIED_TO)] Dn Dn+1 Dn+2 Dn+3 Dm
2762 static bool DisassembleNVTBLFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2763 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2765 const TargetInstrDesc &TID = ARMInsts[Opcode];
2766 const TargetOperandInfo *OpInfo = TID.OpInfo;
2767 if (!OpInfo) return false;
2769 assert(NumOps >= 3 &&
2770 OpInfo[0].RegClass == ARM::DPRRegClassID &&
2771 OpInfo[1].RegClass == ARM::DPRRegClassID &&
2772 OpInfo[2].RegClass == ARM::DPRRegClassID &&
2773 "Expect >= 3 operands and first 3 as reg operands");
2775 unsigned &OpIdx = NumOpsAdded;
2779 unsigned Rn = decodeNEONRn(insn);
2781 // {Dn} encoded as len = 0b00
2782 // {Dn Dn+1} encoded as len = 0b01
2783 // {Dn Dn+1 Dn+2 } encoded as len = 0b10
2784 // {Dn Dn+1 Dn+2 Dn+3} encoded as len = 0b11
2785 unsigned Len = slice(insn, 9, 8) + 1;
2787 // Dd (the destination vector)
2788 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2789 decodeNEONRd(insn))));
2792 // Process tied_to operand constraint.
2794 if ((Idx = TID.getOperandConstraint(OpIdx, TOI::TIED_TO)) != -1) {
2795 MI.addOperand(MI.getOperand(Idx));
2799 // Do the <list> now.
2800 for (unsigned i = 0; i < Len; ++i) {
2801 assert(OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::DPRRegClassID &&
2802 "Reg operand expected");
2803 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2808 // Dm (the index vector)
2809 assert(OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::DPRRegClassID &&
2810 "Reg operand (index vector) expected");
2811 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2812 decodeNEONRm(insn))));
2818 // Vector Get Lane (move scalar to ARM core register) Instructions.
2819 // VGETLNi32, VGETLNs16, VGETLNs8, VGETLNu16, VGETLNu8: Rt Dn index
2820 static bool DisassembleNGetLnFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2821 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2823 const TargetInstrDesc &TID = ARMInsts[Opcode];
2824 const TargetOperandInfo *OpInfo = TID.OpInfo;
2825 if (!OpInfo) return false;
2827 assert(TID.getNumDefs() == 1 && NumOps >= 3 &&
2828 OpInfo[0].RegClass == ARM::GPRRegClassID &&
2829 OpInfo[1].RegClass == ARM::DPRRegClassID &&
2830 OpInfo[2].RegClass < 0 &&
2831 "Expect >= 3 operands with one dst operand");
2834 Opcode == ARM::VGETLNi32 ? ESize32
2835 : ((Opcode == ARM::VGETLNs16 || Opcode == ARM::VGETLNu16) ? ESize16
2838 // Rt = Inst{15-12} => ARM Rd
2839 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2842 // Dn = Inst{7:19-16} => NEON Rn
2843 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2844 decodeNEONRn(insn))));
2846 MI.addOperand(MCOperand::CreateImm(decodeNVLaneOpIndex(insn, esize)));
2852 // Vector Set Lane (move ARM core register to scalar) Instructions.
2853 // VSETLNi16, VSETLNi32, VSETLNi8: Dd Dd (TIED_TO) Rt index
2854 static bool DisassembleNSetLnFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2855 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2857 const TargetInstrDesc &TID = ARMInsts[Opcode];
2858 const TargetOperandInfo *OpInfo = TID.OpInfo;
2859 if (!OpInfo) return false;
2861 assert(TID.getNumDefs() == 1 && NumOps >= 3 &&
2862 OpInfo[0].RegClass == ARM::DPRRegClassID &&
2863 OpInfo[1].RegClass == ARM::DPRRegClassID &&
2864 TID.getOperandConstraint(1, TOI::TIED_TO) != -1 &&
2865 OpInfo[2].RegClass == ARM::GPRRegClassID &&
2866 OpInfo[3].RegClass < 0 &&
2867 "Expect >= 3 operands with one dst operand");
2870 Opcode == ARM::VSETLNi8 ? ESize8
2871 : (Opcode == ARM::VSETLNi16 ? ESize16
2874 // Dd = Inst{7:19-16} => NEON Rn
2875 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2876 decodeNEONRn(insn))));
2879 MI.addOperand(MCOperand::CreateReg(0));
2881 // Rt = Inst{15-12} => ARM Rd
2882 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2885 MI.addOperand(MCOperand::CreateImm(decodeNVLaneOpIndex(insn, esize)));
2891 // Vector Duplicate Instructions (from ARM core register to all elements).
2892 // VDUP8d, VDUP16d, VDUP32d, VDUP8q, VDUP16q, VDUP32q: Qd/Dd Rt
2893 static bool DisassembleNDupFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2894 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2896 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
2898 assert(NumOps >= 2 &&
2899 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2900 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2901 OpInfo[1].RegClass == ARM::GPRRegClassID &&
2902 "Expect >= 2 operands and first 2 as reg operand");
2904 unsigned RegClass = OpInfo[0].RegClass;
2906 // Qd/Dd = Inst{7:19-16} => NEON Rn
2907 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClass,
2908 decodeNEONRn(insn))));
2910 // Rt = Inst{15-12} => ARM Rd
2911 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2921 static inline bool MemBarrierInstr(uint32_t insn) {
2922 unsigned op7_4 = slice(insn, 7, 4);
2923 if (slice(insn, 31, 8) == 0xf57ff0 && (op7_4 >= 4 && op7_4 <= 6))
2929 static inline bool PreLoadOpcode(unsigned Opcode) {
2931 case ARM::PLDi: case ARM::PLDr:
2932 case ARM::PLDWi: case ARM::PLDWr:
2933 case ARM::PLIi: case ARM::PLIr:
2940 static bool DisassemblePreLoadFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2941 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2943 // Preload Data/Instruction requires either 2 or 4 operands.
2944 // PLDi, PLDWi, PLIi: Rn [+/-]imm12 add = (U == '1')
2945 // PLDr[a|m], PLDWr[a|m], PLIr[a|m]: Rn Rm addrmode2_opc
2947 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2950 if (Opcode == ARM::PLDi || Opcode == ARM::PLDWi || Opcode == ARM::PLIi) {
2951 unsigned Imm12 = slice(insn, 11, 0);
2952 bool Negative = getUBit(insn) == 0;
2953 int Offset = Negative ? -1 - Imm12 : 1 * Imm12;
2954 MI.addOperand(MCOperand::CreateImm(Offset));
2957 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2960 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
2962 // Inst{6-5} encodes the shift opcode.
2963 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
2964 // Inst{11-7} encodes the imm5 shift amount.
2965 unsigned ShImm = slice(insn, 11, 7);
2967 // A8.4.1. Possible rrx or shift amount of 32...
2968 getImmShiftSE(ShOp, ShImm);
2969 MI.addOperand(MCOperand::CreateImm(
2970 ARM_AM::getAM2Opc(AddrOpcode, ShImm, ShOp)));
2977 static bool DisassembleMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2978 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2980 if (MemBarrierInstr(insn)) {
2981 // DMBsy, DSBsy, and ISBsy instructions have zero operand and are taken care
2982 // of within the generic ARMBasicMCBuilder::BuildIt() method.
2984 // Inst{3-0} encodes the memory barrier option for the variants.
2985 MI.addOperand(MCOperand::CreateImm(slice(insn, 3, 0)));
3005 // CPS has a singleton $opt operand that contains the following information:
3006 // opt{4-0} = mode from Inst{4-0}
3007 // opt{5} = changemode from Inst{17}
3008 // opt{8-6} = AIF from Inst{8-6}
3009 // opt{10-9} = imod from Inst{19-18} with 0b10 as enable and 0b11 as disable
3010 if (Opcode == ARM::CPS) {
3011 unsigned Option = slice(insn, 4, 0) | slice(insn, 17, 17) << 5 |
3012 slice(insn, 8, 6) << 6 | slice(insn, 19, 18) << 9;
3013 MI.addOperand(MCOperand::CreateImm(Option));
3018 // DBG has its option specified in Inst{3-0}.
3019 if (Opcode == ARM::DBG) {
3020 MI.addOperand(MCOperand::CreateImm(slice(insn, 3, 0)));
3025 // BKPT takes an imm32 val equal to ZeroExtend(Inst{19-8:3-0}).
3026 if (Opcode == ARM::BKPT) {
3027 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 8) << 4 |
3028 slice(insn, 3, 0)));
3033 if (PreLoadOpcode(Opcode))
3034 return DisassemblePreLoadFrm(MI, Opcode, insn, NumOps, NumOpsAdded, B);
3036 assert(0 && "Unexpected misc instruction!");
3040 /// FuncPtrs - FuncPtrs maps ARMFormat to its corresponding DisassembleFP.
3041 /// We divide the disassembly task into different categories, with each one
3042 /// corresponding to a specific instruction encoding format. There could be
3043 /// exceptions when handling a specific format, and that is why the Opcode is
3044 /// also present in the function prototype.
3045 static const DisassembleFP FuncPtrs[] = {
3049 &DisassembleBrMiscFrm,
3051 &DisassembleDPSoRegFrm,
3054 &DisassembleLdMiscFrm,
3055 &DisassembleStMiscFrm,
3056 &DisassembleLdStMulFrm,
3057 &DisassembleLdStExFrm,
3058 &DisassembleArithMiscFrm,
3061 &DisassembleVFPUnaryFrm,
3062 &DisassembleVFPBinaryFrm,
3063 &DisassembleVFPConv1Frm,
3064 &DisassembleVFPConv2Frm,
3065 &DisassembleVFPConv3Frm,
3066 &DisassembleVFPConv4Frm,
3067 &DisassembleVFPConv5Frm,
3068 &DisassembleVFPLdStFrm,
3069 &DisassembleVFPLdStMulFrm,
3070 &DisassembleVFPMiscFrm,
3071 &DisassembleThumbFrm,
3072 &DisassembleMiscFrm,
3073 &DisassembleNGetLnFrm,
3074 &DisassembleNSetLnFrm,
3075 &DisassembleNDupFrm,
3077 // VLD and VST (including one lane) Instructions.
3080 // A7.4.6 One register and a modified immediate value
3081 // 1-Register Instructions with imm.
3082 // LLVM only defines VMOVv instructions.
3083 &DisassembleN1RegModImmFrm,
3085 // 2-Register Instructions with no imm.
3086 &DisassembleN2RegFrm,
3088 // 2-Register Instructions with imm (vector convert float/fixed point).
3089 &DisassembleNVCVTFrm,
3091 // 2-Register Instructions with imm (vector dup lane).
3092 &DisassembleNVecDupLnFrm,
3094 // Vector Shift Left Instructions.
3095 &DisassembleN2RegVecShLFrm,
3097 // Vector Shift Righ Instructions, which has different interpretation of the
3098 // shift amount from the imm6 field.
3099 &DisassembleN2RegVecShRFrm,
3101 // 3-Register Data-Processing Instructions.
3102 &DisassembleN3RegFrm,
3104 // Vector Shift (Register) Instructions.
3105 // D:Vd M:Vm N:Vn (notice that M:Vm is the first operand)
3106 &DisassembleN3RegVecShFrm,
3108 // Vector Extract Instructions.
3109 &DisassembleNVecExtractFrm,
3111 // Vector [Saturating Rounding Doubling] Multiply [Accumulate/Subtract] [Long]
3112 // By Scalar Instructions.
3113 &DisassembleNVecMulScalarFrm,
3115 // Vector Table Lookup uses byte indexes in a control vector to look up byte
3116 // values in a table and generate a new vector.
3117 &DisassembleNVTBLFrm,
3122 /// BuildIt - BuildIt performs the build step for this ARM Basic MC Builder.
3123 /// The general idea is to set the Opcode for the MCInst, followed by adding
3124 /// the appropriate MCOperands to the MCInst. ARM Basic MC Builder delegates
3125 /// to the Format-specific disassemble function for disassembly, followed by
3126 /// TryPredicateAndSBitModifier() to do PredicateOperand and OptionalDefOperand
3127 /// which follow the Dst/Src Operands.
3128 bool ARMBasicMCBuilder::BuildIt(MCInst &MI, uint32_t insn) {
3129 // Stage 1 sets the Opcode.
3130 MI.setOpcode(Opcode);
3131 // If the number of operands is zero, we're done!
3135 // Stage 2 calls the format-specific disassemble function to build the operand
3139 unsigned NumOpsAdded = 0;
3140 bool OK = (*Disasm)(MI, Opcode, insn, NumOps, NumOpsAdded, this);
3142 if (!OK || this->Err != 0) return false;
3143 if (NumOpsAdded >= NumOps)
3146 // Stage 3 deals with operands unaccounted for after stage 2 is finished.
3147 // FIXME: Should this be done selectively?
3148 return TryPredicateAndSBitModifier(MI, Opcode, insn, NumOps - NumOpsAdded);
3151 // A8.3 Conditional execution
3152 // A8.3.1 Pseudocode details of conditional execution
3153 // Condition bits '111x' indicate the instruction is always executed.
3154 static uint32_t CondCode(uint32_t CondField) {
3155 if (CondField == 0xF)
3160 /// DoPredicateOperands - DoPredicateOperands process the predicate operands
3161 /// of some Thumb instructions which come before the reglist operands. It
3162 /// returns true if the two predicate operands have been processed.
3163 bool ARMBasicMCBuilder::DoPredicateOperands(MCInst& MI, unsigned Opcode,
3164 uint32_t /* insn */, unsigned short NumOpsRemaining) {
3166 assert(NumOpsRemaining > 0 && "Invalid argument");
3168 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3169 unsigned Idx = MI.getNumOperands();
3171 // First, we check whether this instr specifies the PredicateOperand through
3172 // a pair of TargetOperandInfos with isPredicate() property.
3173 if (NumOpsRemaining >= 2 &&
3174 OpInfo[Idx].isPredicate() && OpInfo[Idx+1].isPredicate() &&
3175 OpInfo[Idx].RegClass < 0 &&
3176 OpInfo[Idx+1].RegClass == ARM::CCRRegClassID)
3178 // If we are inside an IT block, get the IT condition bits maintained via
3179 // ARMBasicMCBuilder::ITState[7:0], through ARMBasicMCBuilder::GetITCond().
3182 MI.addOperand(MCOperand::CreateImm(GetITCond()));
3184 MI.addOperand(MCOperand::CreateImm(ARMCC::AL));
3185 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
3192 /// TryPredicateAndSBitModifier - TryPredicateAndSBitModifier tries to process
3193 /// the possible Predicate and SBitModifier, to build the remaining MCOperand
3195 bool ARMBasicMCBuilder::TryPredicateAndSBitModifier(MCInst& MI, unsigned Opcode,
3196 uint32_t insn, unsigned short NumOpsRemaining) {
3198 assert(NumOpsRemaining > 0 && "Invalid argument");
3200 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3201 const std::string &Name = ARMInsts[Opcode].Name;
3202 unsigned Idx = MI.getNumOperands();
3204 // First, we check whether this instr specifies the PredicateOperand through
3205 // a pair of TargetOperandInfos with isPredicate() property.
3206 if (NumOpsRemaining >= 2 &&
3207 OpInfo[Idx].isPredicate() && OpInfo[Idx+1].isPredicate() &&
3208 OpInfo[Idx].RegClass < 0 &&
3209 OpInfo[Idx+1].RegClass == ARM::CCRRegClassID)
3211 // If we are inside an IT block, get the IT condition bits maintained via
3212 // ARMBasicMCBuilder::ITState[7:0], through ARMBasicMCBuilder::GetITCond().
3215 MI.addOperand(MCOperand::CreateImm(GetITCond()));
3217 if (Name.length() > 1 && Name[0] == 't') {
3218 // Thumb conditional branch instructions have their cond field embedded,
3222 if (Name == "t2Bcc")
3223 MI.addOperand(MCOperand::CreateImm(CondCode(slice(insn, 25, 22))));
3224 else if (Name == "tBcc")
3225 MI.addOperand(MCOperand::CreateImm(CondCode(slice(insn, 11, 8))));
3227 MI.addOperand(MCOperand::CreateImm(ARMCC::AL));
3229 // ARM instructions get their condition field from Inst{31-28}.
3230 MI.addOperand(MCOperand::CreateImm(CondCode(getCondField(insn))));
3233 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
3235 NumOpsRemaining -= 2;
3238 if (NumOpsRemaining == 0)
3241 // Next, if OptionalDefOperand exists, we check whether the 'S' bit is set.
3242 if (OpInfo[Idx].isOptionalDef() && OpInfo[Idx].RegClass==ARM::CCRRegClassID) {
3243 MI.addOperand(MCOperand::CreateReg(getSBit(insn) == 1 ? ARM::CPSR : 0));
3247 if (NumOpsRemaining == 0)
3253 /// RunBuildAfterHook - RunBuildAfterHook performs operations deemed necessary
3254 /// after BuildIt is finished.
3255 bool ARMBasicMCBuilder::RunBuildAfterHook(bool Status, MCInst &MI,
3258 if (!SP) return Status;
3260 if (Opcode == ARM::t2IT)
3261 Status = SP->InitIT(slice(insn, 7, 0)) ? Status : false;
3262 else if (InITBlock())
3268 /// Opcode, Format, and NumOperands make up an ARM Basic MCBuilder.
3269 ARMBasicMCBuilder::ARMBasicMCBuilder(unsigned opc, ARMFormat format,
3271 : Opcode(opc), Format(format), NumOps(num), SP(0), Err(0) {
3272 unsigned Idx = (unsigned)format;
3273 assert(Idx < (array_lengthof(FuncPtrs) - 1) && "Unknown format");
3274 Disasm = FuncPtrs[Idx];
3277 /// CreateMCBuilder - Return an ARMBasicMCBuilder that can build up the MC
3278 /// infrastructure of an MCInst given the Opcode and Format of the instr.
3279 /// Return NULL if it fails to create/return a proper builder. API clients
3280 /// are responsible for freeing up of the allocated memory. Cacheing can be
3281 /// performed by the API clients to improve performance.
3282 ARMBasicMCBuilder *llvm::CreateMCBuilder(unsigned Opcode, ARMFormat Format) {
3283 // For "Unknown format", fail by returning a NULL pointer.
3284 if ((unsigned)Format >= (array_lengthof(FuncPtrs) - 1)) {
3285 DEBUG(errs() << "Unknown format\n");
3289 return new ARMBasicMCBuilder(Opcode, Format,
3290 ARMInsts[Opcode].getNumOperands());