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 if (RegClassID == ARM::rGPRRegClassID) {
86 // Check for The register numbers 13 and 15 that are not permitted for many
87 // Thumb register specifiers.
88 if (RawRegister == 13 || RawRegister == 15) {
92 // For this purpose, we can treat rGPR as if it were GPR.
93 RegClassID = ARM::GPRRegClassID;
96 // See also decodeNEONRd(), decodeNEONRn(), decodeNEONRm().
97 // A7.3 register encoding
102 // If one of these bits is 1, the instruction is UNDEFINED.
103 if (RegClassID == ARM::QPRRegClassID && slice(RawRegister, 0, 0) == 1) {
108 RegClassID == ARM::QPRRegClassID ? RawRegister >> 1 : RawRegister;
114 switch (RegClassID) {
115 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R0;
116 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
117 case ARM::DPR_VFP2RegClassID:
119 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
120 case ARM::QPR_VFP2RegClassID:
122 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S0;
126 switch (RegClassID) {
127 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R1;
128 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
129 case ARM::DPR_VFP2RegClassID:
131 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
132 case ARM::QPR_VFP2RegClassID:
134 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S1;
138 switch (RegClassID) {
139 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R2;
140 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
141 case ARM::DPR_VFP2RegClassID:
143 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
144 case ARM::QPR_VFP2RegClassID:
146 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S2;
150 switch (RegClassID) {
151 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R3;
152 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
153 case ARM::DPR_VFP2RegClassID:
155 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
156 case ARM::QPR_VFP2RegClassID:
158 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S3;
162 switch (RegClassID) {
163 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R4;
164 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
165 case ARM::DPR_VFP2RegClassID:
167 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q4;
168 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S4;
172 switch (RegClassID) {
173 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R5;
174 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
175 case ARM::DPR_VFP2RegClassID:
177 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q5;
178 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S5;
182 switch (RegClassID) {
183 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R6;
184 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
185 case ARM::DPR_VFP2RegClassID:
187 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q6;
188 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S6;
192 switch (RegClassID) {
193 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R7;
194 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
195 case ARM::DPR_VFP2RegClassID:
197 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q7;
198 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S7;
202 switch (RegClassID) {
203 case ARM::GPRRegClassID: return ARM::R8;
204 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D8;
205 case ARM::QPRRegClassID: return ARM::Q8;
206 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S8;
210 switch (RegClassID) {
211 case ARM::GPRRegClassID: return ARM::R9;
212 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D9;
213 case ARM::QPRRegClassID: return ARM::Q9;
214 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S9;
218 switch (RegClassID) {
219 case ARM::GPRRegClassID: return ARM::R10;
220 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D10;
221 case ARM::QPRRegClassID: return ARM::Q10;
222 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S10;
226 switch (RegClassID) {
227 case ARM::GPRRegClassID: return ARM::R11;
228 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D11;
229 case ARM::QPRRegClassID: return ARM::Q11;
230 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S11;
234 switch (RegClassID) {
235 case ARM::GPRRegClassID: return ARM::R12;
236 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D12;
237 case ARM::QPRRegClassID: return ARM::Q12;
238 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S12;
242 switch (RegClassID) {
243 case ARM::GPRRegClassID: return ARM::SP;
244 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D13;
245 case ARM::QPRRegClassID: return ARM::Q13;
246 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S13;
250 switch (RegClassID) {
251 case ARM::GPRRegClassID: return ARM::LR;
252 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D14;
253 case ARM::QPRRegClassID: return ARM::Q14;
254 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S14;
258 switch (RegClassID) {
259 case ARM::GPRRegClassID: return ARM::PC;
260 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D15;
261 case ARM::QPRRegClassID: return ARM::Q15;
262 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S15;
266 switch (RegClassID) {
267 case ARM::DPRRegClassID: return ARM::D16;
268 case ARM::SPRRegClassID: return ARM::S16;
272 switch (RegClassID) {
273 case ARM::DPRRegClassID: return ARM::D17;
274 case ARM::SPRRegClassID: return ARM::S17;
278 switch (RegClassID) {
279 case ARM::DPRRegClassID: return ARM::D18;
280 case ARM::SPRRegClassID: return ARM::S18;
284 switch (RegClassID) {
285 case ARM::DPRRegClassID: return ARM::D19;
286 case ARM::SPRRegClassID: return ARM::S19;
290 switch (RegClassID) {
291 case ARM::DPRRegClassID: return ARM::D20;
292 case ARM::SPRRegClassID: return ARM::S20;
296 switch (RegClassID) {
297 case ARM::DPRRegClassID: return ARM::D21;
298 case ARM::SPRRegClassID: return ARM::S21;
302 switch (RegClassID) {
303 case ARM::DPRRegClassID: return ARM::D22;
304 case ARM::SPRRegClassID: return ARM::S22;
308 switch (RegClassID) {
309 case ARM::DPRRegClassID: return ARM::D23;
310 case ARM::SPRRegClassID: return ARM::S23;
314 switch (RegClassID) {
315 case ARM::DPRRegClassID: return ARM::D24;
316 case ARM::SPRRegClassID: return ARM::S24;
320 switch (RegClassID) {
321 case ARM::DPRRegClassID: return ARM::D25;
322 case ARM::SPRRegClassID: return ARM::S25;
326 switch (RegClassID) {
327 case ARM::DPRRegClassID: return ARM::D26;
328 case ARM::SPRRegClassID: return ARM::S26;
332 switch (RegClassID) {
333 case ARM::DPRRegClassID: return ARM::D27;
334 case ARM::SPRRegClassID: return ARM::S27;
338 switch (RegClassID) {
339 case ARM::DPRRegClassID: return ARM::D28;
340 case ARM::SPRRegClassID: return ARM::S28;
344 switch (RegClassID) {
345 case ARM::DPRRegClassID: return ARM::D29;
346 case ARM::SPRRegClassID: return ARM::S29;
350 switch (RegClassID) {
351 case ARM::DPRRegClassID: return ARM::D30;
352 case ARM::SPRRegClassID: return ARM::S30;
356 switch (RegClassID) {
357 case ARM::DPRRegClassID: return ARM::D31;
358 case ARM::SPRRegClassID: return ARM::S31;
362 DEBUG(errs() << "Invalid (RegClassID, RawRegister) combination\n");
363 // Encoding error. Mark the builder with error code != 0.
368 ///////////////////////////////
370 // Utility Functions //
372 ///////////////////////////////
374 // Extract/Decode Rd: Inst{15-12}.
375 static inline unsigned decodeRd(uint32_t insn) {
376 return (insn >> ARMII::RegRdShift) & ARMII::GPRRegMask;
379 // Extract/Decode Rn: Inst{19-16}.
380 static inline unsigned decodeRn(uint32_t insn) {
381 return (insn >> ARMII::RegRnShift) & ARMII::GPRRegMask;
384 // Extract/Decode Rm: Inst{3-0}.
385 static inline unsigned decodeRm(uint32_t insn) {
386 return (insn & ARMII::GPRRegMask);
389 // Extract/Decode Rs: Inst{11-8}.
390 static inline unsigned decodeRs(uint32_t insn) {
391 return (insn >> ARMII::RegRsShift) & ARMII::GPRRegMask;
394 static inline unsigned getCondField(uint32_t insn) {
395 return (insn >> ARMII::CondShift);
398 static inline unsigned getIBit(uint32_t insn) {
399 return (insn >> ARMII::I_BitShift) & 1;
402 static inline unsigned getAM3IBit(uint32_t insn) {
403 return (insn >> ARMII::AM3_I_BitShift) & 1;
406 static inline unsigned getPBit(uint32_t insn) {
407 return (insn >> ARMII::P_BitShift) & 1;
410 static inline unsigned getUBit(uint32_t insn) {
411 return (insn >> ARMII::U_BitShift) & 1;
414 static inline unsigned getPUBits(uint32_t insn) {
415 return (insn >> ARMII::U_BitShift) & 3;
418 static inline unsigned getSBit(uint32_t insn) {
419 return (insn >> ARMII::S_BitShift) & 1;
422 static inline unsigned getWBit(uint32_t insn) {
423 return (insn >> ARMII::W_BitShift) & 1;
426 static inline unsigned getDBit(uint32_t insn) {
427 return (insn >> ARMII::D_BitShift) & 1;
430 static inline unsigned getNBit(uint32_t insn) {
431 return (insn >> ARMII::N_BitShift) & 1;
434 static inline unsigned getMBit(uint32_t insn) {
435 return (insn >> ARMII::M_BitShift) & 1;
438 // See A8.4 Shifts applied to a register.
439 // A8.4.2 Register controlled shifts.
441 // getShiftOpcForBits - getShiftOpcForBits translates from the ARM encoding bits
442 // into llvm enums for shift opcode. The API clients should pass in the value
443 // encoded with two bits, so the assert stays to signal a wrong API usage.
445 // A8-12: DecodeRegShift()
446 static inline ARM_AM::ShiftOpc getShiftOpcForBits(unsigned bits) {
448 default: assert(0 && "No such value"); return ARM_AM::no_shift;
449 case 0: return ARM_AM::lsl;
450 case 1: return ARM_AM::lsr;
451 case 2: return ARM_AM::asr;
452 case 3: return ARM_AM::ror;
456 // See A8.4 Shifts applied to a register.
457 // A8.4.1 Constant shifts.
459 // getImmShiftSE - getImmShiftSE translates from the raw ShiftOpc and raw Imm5
460 // encodings into the intended ShiftOpc and shift amount.
462 // A8-11: DecodeImmShift()
463 static inline void getImmShiftSE(ARM_AM::ShiftOpc &ShOp, unsigned &ShImm) {
467 case ARM_AM::no_shift:
471 ShOp = ARM_AM::no_shift;
483 // getAMSubModeForBits - getAMSubModeForBits translates from the ARM encoding
484 // bits Inst{24-23} (P(24) and U(23)) into llvm enums for AMSubMode. The API
485 // clients should pass in the value encoded with two bits, so the assert stays
486 // to signal a wrong API usage.
487 static inline ARM_AM::AMSubMode getAMSubModeForBits(unsigned bits) {
489 default: assert(0 && "No such value"); return ARM_AM::bad_am_submode;
490 case 1: return ARM_AM::ia; // P=0 U=1
491 case 3: return ARM_AM::ib; // P=1 U=1
492 case 0: return ARM_AM::da; // P=0 U=0
493 case 2: return ARM_AM::db; // P=1 U=0
497 ////////////////////////////////////////////
499 // Disassemble function definitions //
501 ////////////////////////////////////////////
503 /// There is a separate Disassemble*Frm function entry for disassembly of an ARM
504 /// instr into a list of MCOperands in the appropriate order, with possible dst,
505 /// followed by possible src(s).
507 /// The processing of the predicate, and the 'S' modifier bit, if MI modifies
508 /// the CPSR, is factored into ARMBasicMCBuilder's method named
509 /// TryPredicateAndSBitModifier.
511 static bool DisassemblePseudo(MCInst &MI, unsigned Opcode, uint32_t insn,
512 unsigned short NumOps, unsigned &NumOpsAdded, BO) {
514 assert(0 && "Unexpected pseudo instruction!");
519 // if d == 15 || n == 15 || m == 15 || a == 15 then UNPREDICTABLE;
522 // if d == 15 || n == 15 || m == 15 then UNPREDICTABLE;
525 // if dLo == 15 || dHi == 15 || n == 15 || m == 15 then UNPREDICTABLE;
526 // if dHi == dLo then UNPREDICTABLE;
527 static bool BadRegsMulFrm(unsigned Opcode, uint32_t insn) {
528 unsigned R19_16 = slice(insn, 19, 16);
529 unsigned R15_12 = slice(insn, 15, 12);
530 unsigned R11_8 = slice(insn, 11, 8);
531 unsigned R3_0 = slice(insn, 3, 0);
534 // Did we miss an opcode?
535 assert(0 && "Unexpected opcode!");
537 case ARM::MLA: case ARM::MLS: case ARM::SMLABB: case ARM::SMLABT:
538 case ARM::SMLATB: case ARM::SMLATT: case ARM::SMLAWB: case ARM::SMLAWT:
539 case ARM::SMMLA: case ARM::SMMLS: case ARM::USADA8:
540 if (R19_16 == 15 || R15_12 == 15 || R11_8 == 15 || R3_0 == 15)
543 case ARM::MUL: case ARM::SMMUL: case ARM::SMULBB: case ARM::SMULBT:
544 case ARM::SMULTB: case ARM::SMULTT: case ARM::SMULWB: case ARM::SMULWT:
545 case ARM::SMUAD: case ARM::SMUADX:
546 // A8.6.167 SMLAD & A8.6.172 SMLSD
547 case ARM::SMLAD: case ARM::SMLADX: case ARM::SMLSD: case ARM::SMLSDX:
549 if (R19_16 == 15 || R11_8 == 15 || R3_0 == 15)
552 case ARM::SMLAL: case ARM::SMULL: case ARM::UMAAL: case ARM::UMLAL:
554 case ARM::SMLALBB: case ARM::SMLALBT: case ARM::SMLALTB: case ARM::SMLALTT:
555 case ARM::SMLALD: case ARM::SMLALDX: case ARM::SMLSLD: case ARM::SMLSLDX:
556 if (R19_16 == 15 || R15_12 == 15 || R11_8 == 15 || R3_0 == 15)
558 if (R19_16 == R15_12)
564 // Multiply Instructions.
565 // MLA, MLS, SMLABB, SMLABT, SMLATB, SMLATT, SMLAWB, SMLAWT, SMMLA, SMMLS,
566 // SMLAD, SMLADX, SMLSD, SMLSDX, USADA8 (for convenience):
567 // Rd{19-16} Rn{3-0} Rm{11-8} Ra{15-12}
568 // But note that register checking for {SMLAD, SMLADX, SMLSD, SMLSDX} is
569 // only for {d, n, m}.
571 // MUL, SMMUL, SMULBB, SMULBT, SMULTB, SMULTT, SMULWB, SMULWT, SMUAD, SMUADX,
572 // USAD8 (for convenience):
573 // Rd{19-16} Rn{3-0} Rm{11-8}
575 // SMLAL, SMULL, UMAAL, UMLAL, UMULL, SMLALBB, SMLALBT, SMLALTB, SMLALTT,
576 // SMLALD, SMLADLX, SMLSLD, SMLSLDX:
577 // RdLo{15-12} RdHi{19-16} Rn{3-0} Rm{11-8}
579 // The mapping of the multiply registers to the "regular" ARM registers, where
580 // there are convenience decoder functions, is:
586 static bool DisassembleMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
587 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
589 const TargetInstrDesc &TID = ARMInsts[Opcode];
590 unsigned short NumDefs = TID.getNumDefs();
591 const TargetOperandInfo *OpInfo = TID.OpInfo;
592 unsigned &OpIdx = NumOpsAdded;
596 assert(NumDefs > 0 && "NumDefs should be greater than 0 for MulFrm");
598 && OpInfo[0].RegClass == ARM::GPRRegClassID
599 && OpInfo[1].RegClass == ARM::GPRRegClassID
600 && OpInfo[2].RegClass == ARM::GPRRegClassID
601 && "Expect three register operands");
603 // Sanity check for the register encodings.
604 if (BadRegsMulFrm(Opcode, insn))
607 // Instructions with two destination registers have RdLo{15-12} first.
609 assert(NumOps >= 4 && OpInfo[3].RegClass == ARM::GPRRegClassID &&
610 "Expect 4th register operand");
611 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
616 // The destination register: RdHi{19-16} or Rd{19-16}.
617 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
620 // The two src regsiters: Rn{3-0}, then Rm{11-8}.
621 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
623 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
627 // Many multiply instructions (e.g., MLA) have three src registers.
628 // The third register operand is Ra{15-12}.
629 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) {
630 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
638 // Helper routines for disassembly of coprocessor instructions.
640 static bool LdStCopOpcode(unsigned Opcode) {
641 if ((Opcode >= ARM::LDC2L_OFFSET && Opcode <= ARM::LDC_PRE) ||
642 (Opcode >= ARM::STC2L_OFFSET && Opcode <= ARM::STC_PRE))
646 static bool CoprocessorOpcode(unsigned Opcode) {
647 if (LdStCopOpcode(Opcode))
653 case ARM::CDP: case ARM::CDP2:
654 case ARM::MCR: case ARM::MCR2: case ARM::MRC: case ARM::MRC2:
655 case ARM::MCRR: case ARM::MCRR2: case ARM::MRRC: case ARM::MRRC2:
659 static inline unsigned GetCoprocessor(uint32_t insn) {
660 return slice(insn, 11, 8);
662 static inline unsigned GetCopOpc1(uint32_t insn, bool CDP) {
663 return CDP ? slice(insn, 23, 20) : slice(insn, 23, 21);
665 static inline unsigned GetCopOpc2(uint32_t insn) {
666 return slice(insn, 7, 5);
668 static inline unsigned GetCopOpc(uint32_t insn) {
669 return slice(insn, 7, 4);
671 // Most of the operands are in immediate forms, except Rd and Rn, which are ARM
674 // CDP, CDP2: cop opc1 CRd CRn CRm opc2
676 // MCR, MCR2, MRC, MRC2: cop opc1 Rd CRn CRm opc2
678 // MCRR, MCRR2, MRRC, MRRc2: cop opc Rd Rn CRm
680 // LDC_OFFSET, LDC_PRE, LDC_POST: cop CRd Rn R0 [+/-]imm8:00
682 // STC_OFFSET, STC_PRE, STC_POST: cop CRd Rn R0 [+/-]imm8:00
686 // LDC_OPTION: cop CRd Rn imm8
688 // STC_OPTION: cop CRd Rn imm8
691 static bool DisassembleCoprocessor(MCInst &MI, unsigned Opcode, uint32_t insn,
692 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
694 assert(NumOps >= 4 && "Num of operands >= 4 for coprocessor instr");
696 unsigned &OpIdx = NumOpsAdded;
698 // if coproc == '101x' then SEE "Advanced SIMD and VFP"
699 // But since the special instructions have more explicit encoding bits
700 // specified, if coproc == 10 or 11, we should reject it as invalid.
701 unsigned coproc = GetCoprocessor(insn);
702 if ((Opcode == ARM::MCR || Opcode == ARM::MCRR ||
703 Opcode == ARM::MRC || Opcode == ARM::MRRC) &&
704 (coproc == 10 || coproc == 11)) {
705 DEBUG(errs() << "Encoding error: coproc == 10 or 11 for MCR[R]/MR[R]C\n");
709 bool OneCopOpc = (Opcode == ARM::MCRR || Opcode == ARM::MCRR2 ||
710 Opcode == ARM::MRRC || Opcode == ARM::MRRC2);
712 // CDP/CDP2 has no GPR operand; the opc1 operand is also wider (Inst{23-20}).
713 bool NoGPR = (Opcode == ARM::CDP || Opcode == ARM::CDP2);
714 bool LdStCop = LdStCopOpcode(Opcode);
715 bool RtOut = (Opcode == ARM::MRC || Opcode == ARM::MRC2);
720 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
724 MI.addOperand(MCOperand::CreateImm(coproc));
728 // Unindex if P:W = 0b00 --> _OPTION variant
729 unsigned PW = getPBit(insn) << 1 | getWBit(insn);
731 MI.addOperand(MCOperand::CreateImm(decodeRd(insn)));
733 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
738 MI.addOperand(MCOperand::CreateReg(0));
739 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
740 const TargetInstrDesc &TID = ARMInsts[Opcode];
742 (TID.TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift;
743 unsigned Offset = ARM_AM::getAM2Opc(AddrOpcode, slice(insn, 7, 0) << 2,
744 ARM_AM::no_shift, IndexMode);
745 MI.addOperand(MCOperand::CreateImm(Offset));
748 MI.addOperand(MCOperand::CreateImm(slice(insn, 7, 0)));
752 MI.addOperand(MCOperand::CreateImm(OneCopOpc ? GetCopOpc(insn)
753 : GetCopOpc1(insn, NoGPR)));
757 MI.addOperand(NoGPR ? MCOperand::CreateImm(decodeRd(insn))
758 : MCOperand::CreateReg(
759 getRegisterEnum(B, ARM::GPRRegClassID,
764 MI.addOperand(OneCopOpc ? MCOperand::CreateReg(
765 getRegisterEnum(B, ARM::GPRRegClassID,
767 : MCOperand::CreateImm(decodeRn(insn)));
769 MI.addOperand(MCOperand::CreateImm(decodeRm(insn)));
774 MI.addOperand(MCOperand::CreateImm(GetCopOpc2(insn)));
782 // Branch Instructions.
783 // BL: SignExtend(Imm24:'00', 32)
784 // Bcc, BL_pred: SignExtend(Imm24:'00', 32) Pred0 Pred1
785 // SMC: ZeroExtend(imm4, 32)
786 // SVC: ZeroExtend(Imm24, 32)
788 // Various coprocessor instructions are assigned BrFrm arbitrarily.
789 // Delegates to DisassembleCoprocessor() helper function.
792 // MSR/MSRsys: Rm mask=Inst{19-16}
794 // MSRi/MSRsysi: so_imm
795 // SRSW/SRS: ldstm_mode:$amode mode_imm
796 // RFEW/RFE: ldstm_mode:$amode Rn
797 static bool DisassembleBrFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
798 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
800 if (CoprocessorOpcode(Opcode))
801 return DisassembleCoprocessor(MI, Opcode, insn, NumOps, NumOpsAdded, B);
803 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
804 if (!OpInfo) return false;
806 // MRS and MRSsys take one GPR reg Rd.
807 if (Opcode == ARM::MRS || Opcode == ARM::MRSsys) {
808 assert(NumOps >= 1 && OpInfo[0].RegClass == ARM::GPRRegClassID &&
809 "Reg operand expected");
810 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
815 // BXJ takes one GPR reg Rm.
816 if (Opcode == ARM::BXJ) {
817 assert(NumOps >= 1 && OpInfo[0].RegClass == ARM::GPRRegClassID &&
818 "Reg operand expected");
819 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
824 // MSR take a mask, followed by one GPR reg Rm. The mask contains the R Bit in
825 // bit 4, and the special register fields in bits 3-0.
826 if (Opcode == ARM::MSR) {
827 assert(NumOps >= 1 && OpInfo[1].RegClass == ARM::GPRRegClassID &&
828 "Reg operand expected");
829 MI.addOperand(MCOperand::CreateImm(slice(insn, 22, 22) << 4 /* R Bit */ |
830 slice(insn, 19, 16) /* Special Reg */ ));
831 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
836 // MSRi take a mask, followed by one so_imm operand. The mask contains the
837 // R Bit in bit 4, and the special register fields in bits 3-0.
838 if (Opcode == ARM::MSRi) {
839 // A5.2.11 MSR (immediate), and hints & B6.1.6 MSR (immediate)
840 // The hints instructions have more specific encodings, so if mask == 0,
841 // we should reject this as an invalid instruction.
842 if (slice(insn, 19, 16) == 0)
844 MI.addOperand(MCOperand::CreateImm(slice(insn, 22, 22) << 4 /* R Bit */ |
845 slice(insn, 19, 16) /* Special Reg */ ));
846 // SOImm is 4-bit rotate amount in bits 11-8 with 8-bit imm in bits 7-0.
847 // A5.2.4 Rotate amount is twice the numeric value of Inst{11-8}.
848 // See also ARMAddressingModes.h: getSOImmValImm() and getSOImmValRot().
849 unsigned Rot = (insn >> ARMII::SoRotImmShift) & 0xF;
850 unsigned Imm = insn & 0xFF;
851 MI.addOperand(MCOperand::CreateImm(ARM_AM::rotr32(Imm, 2*Rot)));
855 if (Opcode == ARM::SRSW || Opcode == ARM::SRS ||
856 Opcode == ARM::RFEW || Opcode == ARM::RFE) {
857 ARM_AM::AMSubMode SubMode = getAMSubModeForBits(getPUBits(insn));
858 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM4ModeImm(SubMode)));
860 if (Opcode == ARM::SRSW || Opcode == ARM::SRS)
861 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0)));
863 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
869 assert((Opcode == ARM::Bcc || Opcode == ARM::BL || Opcode == ARM::BL_pred
870 || Opcode == ARM::SMC || Opcode == ARM::SVC) &&
871 "Unexpected Opcode");
873 assert(NumOps >= 1 && OpInfo[0].RegClass < 0 && "Imm operand expected");
876 if (Opcode == ARM::SMC) {
877 // ZeroExtend(imm4, 32) where imm24 = Inst{3-0}.
878 Imm32 = slice(insn, 3, 0);
879 } else if (Opcode == ARM::SVC) {
880 // ZeroExtend(imm24, 32) where imm24 = Inst{23-0}.
881 Imm32 = slice(insn, 23, 0);
883 // SignExtend(imm24:'00', 32) where imm24 = Inst{23-0}.
884 unsigned Imm26 = slice(insn, 23, 0) << 2;
885 //Imm32 = signextend<signed int, 26>(Imm26);
886 Imm32 = SignExtend32<26>(Imm26);
889 MI.addOperand(MCOperand::CreateImm(Imm32));
895 // Misc. Branch Instructions.
898 static bool DisassembleBrMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
899 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
901 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
902 if (!OpInfo) return false;
904 unsigned &OpIdx = NumOpsAdded;
908 // BX_RET and MOVPCLR have only two predicate operands; do an early return.
909 if (Opcode == ARM::BX_RET || Opcode == ARM::MOVPCLR)
912 // BLX and BX take one GPR reg.
913 if (Opcode == ARM::BLX || Opcode == ARM::BLX_pred ||
915 assert(NumOps >= 1 && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
916 "Reg operand expected");
917 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
923 // BLXi takes imm32 (the PC offset).
924 if (Opcode == ARM::BLXi) {
925 assert(NumOps >= 1 && OpInfo[0].RegClass < 0 && "Imm operand expected");
926 // SignExtend(imm24:H:'0', 32) where imm24 = Inst{23-0} and H = Inst{24}.
927 unsigned Imm26 = slice(insn, 23, 0) << 2 | slice(insn, 24, 24) << 1;
928 int Imm32 = SignExtend32<26>(Imm26);
929 MI.addOperand(MCOperand::CreateImm(Imm32));
937 static inline bool getBFCInvMask(uint32_t insn, uint32_t &mask) {
938 uint32_t lsb = slice(insn, 11, 7);
939 uint32_t msb = slice(insn, 20, 16);
942 DEBUG(errs() << "Encoding error: msb < lsb\n");
946 for (uint32_t i = lsb; i <= msb; ++i)
952 // A major complication is the fact that some of the saturating add/subtract
953 // operations have Rd Rm Rn, instead of the "normal" Rd Rn Rm.
954 // They are QADD, QDADD, QDSUB, and QSUB.
955 static bool DisassembleDPFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
956 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
958 const TargetInstrDesc &TID = ARMInsts[Opcode];
959 unsigned short NumDefs = TID.getNumDefs();
960 bool isUnary = isUnaryDP(TID.TSFlags);
961 const TargetOperandInfo *OpInfo = TID.OpInfo;
962 unsigned &OpIdx = NumOpsAdded;
966 // Disassemble register def if there is one.
967 if (NumDefs && (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID)) {
968 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
973 // Now disassemble the src operands.
977 // Special-case handling of BFC/BFI/SBFX/UBFX.
978 if (Opcode == ARM::BFC || Opcode == ARM::BFI) {
979 MI.addOperand(MCOperand::CreateReg(0));
980 if (Opcode == ARM::BFI) {
981 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
986 if (!getBFCInvMask(insn, mask))
989 MI.addOperand(MCOperand::CreateImm(mask));
993 if (Opcode == ARM::SBFX || Opcode == ARM::UBFX) {
994 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
996 MI.addOperand(MCOperand::CreateImm(slice(insn, 11, 7)));
997 MI.addOperand(MCOperand::CreateImm(slice(insn, 20, 16) + 1));
1002 bool RmRn = (Opcode == ARM::QADD || Opcode == ARM::QDADD ||
1003 Opcode == ARM::QDSUB || Opcode == ARM::QSUB);
1005 // BinaryDP has an Rn operand.
1007 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1008 "Reg operand expected");
1009 MI.addOperand(MCOperand::CreateReg(
1010 getRegisterEnum(B, ARM::GPRRegClassID,
1011 RmRn ? decodeRm(insn) : decodeRn(insn))));
1015 // If this is a two-address operand, skip it, e.g., MOVCCr operand 1.
1016 if (isUnary && (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)) {
1017 MI.addOperand(MCOperand::CreateReg(0));
1021 // Now disassemble operand 2.
1022 if (OpIdx >= NumOps)
1025 if (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) {
1026 // We have a reg/reg form.
1027 // Assert disabled because saturating operations, e.g., A8.6.127 QASX, are
1028 // routed here as well.
1029 // assert(getIBit(insn) == 0 && "I_Bit != '0' reg/reg form");
1030 MI.addOperand(MCOperand::CreateReg(
1031 getRegisterEnum(B, ARM::GPRRegClassID,
1032 RmRn? decodeRn(insn) : decodeRm(insn))));
1034 } else if (Opcode == ARM::MOVi16 || Opcode == ARM::MOVTi16) {
1035 // We have an imm16 = imm4:imm12 (imm4=Inst{19:16}, imm12 = Inst{11:0}).
1036 assert(getIBit(insn) == 1 && "I_Bit != '1' reg/imm form");
1037 unsigned Imm16 = slice(insn, 19, 16) << 12 | slice(insn, 11, 0);
1038 MI.addOperand(MCOperand::CreateImm(Imm16));
1041 // We have a reg/imm form.
1042 // SOImm is 4-bit rotate amount in bits 11-8 with 8-bit imm in bits 7-0.
1043 // A5.2.4 Rotate amount is twice the numeric value of Inst{11-8}.
1044 // See also ARMAddressingModes.h: getSOImmValImm() and getSOImmValRot().
1045 assert(getIBit(insn) == 1 && "I_Bit != '1' reg/imm form");
1046 unsigned Rot = (insn >> ARMII::SoRotImmShift) & 0xF;
1047 unsigned Imm = insn & 0xFF;
1048 MI.addOperand(MCOperand::CreateImm(ARM_AM::rotr32(Imm, 2*Rot)));
1055 static bool DisassembleDPSoRegFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1056 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1058 const TargetInstrDesc &TID = ARMInsts[Opcode];
1059 unsigned short NumDefs = TID.getNumDefs();
1060 bool isUnary = isUnaryDP(TID.TSFlags);
1061 const TargetOperandInfo *OpInfo = TID.OpInfo;
1062 unsigned &OpIdx = NumOpsAdded;
1066 // Disassemble register def if there is one.
1067 if (NumDefs && (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID)) {
1068 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1073 // Disassemble the src operands.
1074 if (OpIdx >= NumOps)
1077 // BinaryDP has an Rn operand.
1079 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1080 "Reg operand expected");
1081 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1086 // If this is a two-address operand, skip it, e.g., MOVCCs operand 1.
1087 if (isUnary && (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)) {
1088 MI.addOperand(MCOperand::CreateReg(0));
1092 // Disassemble operand 2, which consists of three components.
1093 if (OpIdx + 2 >= NumOps)
1096 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
1097 (OpInfo[OpIdx+1].RegClass == ARM::GPRRegClassID) &&
1098 (OpInfo[OpIdx+2].RegClass < 0) &&
1099 "Expect 3 reg operands");
1101 // Register-controlled shifts have Inst{7} = 0 and Inst{4} = 1.
1102 unsigned Rs = slice(insn, 4, 4);
1104 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1107 // If Inst{7} != 0, we should reject this insn as an invalid encoding.
1108 if (slice(insn, 7, 7))
1111 // A8.6.3 ADC (register-shifted register)
1112 // if d == 15 || n == 15 || m == 15 || s == 15 then UNPREDICTABLE;
1114 // This also accounts for shift instructions (register) where, fortunately,
1115 // Inst{19-16} = 0b0000.
1116 // A8.6.89 LSL (register)
1117 // if d == 15 || n == 15 || m == 15 then UNPREDICTABLE;
1118 if (decodeRd(insn) == 15 || decodeRn(insn) == 15 ||
1119 decodeRm(insn) == 15 || decodeRs(insn) == 15)
1122 // Register-controlled shifts: [Rm, Rs, shift].
1123 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1125 // Inst{6-5} encodes the shift opcode.
1126 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1127 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(ShOp, 0)));
1129 // Constant shifts: [Rm, reg0, shift_imm].
1130 MI.addOperand(MCOperand::CreateReg(0)); // NoRegister
1131 // Inst{6-5} encodes the shift opcode.
1132 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1133 // Inst{11-7} encodes the imm5 shift amount.
1134 unsigned ShImm = slice(insn, 11, 7);
1136 // A8.4.1. Possible rrx or shift amount of 32...
1137 getImmShiftSE(ShOp, ShImm);
1138 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(ShOp, ShImm)));
1145 static bool DisassembleLdStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1146 unsigned short NumOps, unsigned &NumOpsAdded, bool isStore, BO B) {
1148 const TargetInstrDesc &TID = ARMInsts[Opcode];
1149 bool isPrePost = isPrePostLdSt(TID.TSFlags);
1150 const TargetOperandInfo *OpInfo = TID.OpInfo;
1151 if (!OpInfo) return false;
1153 unsigned &OpIdx = NumOpsAdded;
1157 assert(((!isStore && TID.getNumDefs() > 0) ||
1158 (isStore && (TID.getNumDefs() == 0 || isPrePost)))
1159 && "Invalid arguments");
1161 // Operand 0 of a pre- and post-indexed store is the address base writeback.
1162 if (isPrePost && isStore) {
1163 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1164 "Reg operand expected");
1165 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1170 // Disassemble the dst/src operand.
1171 if (OpIdx >= NumOps)
1174 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1175 "Reg operand expected");
1176 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1180 // After dst of a pre- and post-indexed load is the address base writeback.
1181 if (isPrePost && !isStore) {
1182 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1183 "Reg operand expected");
1184 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1189 // Disassemble the base operand.
1190 if (OpIdx >= NumOps)
1193 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1194 "Reg operand expected");
1195 assert((!isPrePost || (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1))
1196 && "Index mode or tied_to operand expected");
1197 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1201 // For reg/reg form, base reg is followed by +/- reg shop imm.
1202 // For immediate form, it is followed by +/- imm12.
1203 // See also ARMAddressingModes.h (Addressing Mode #2).
1204 if (OpIdx + 1 >= NumOps)
1207 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1208 unsigned IndexMode =
1209 (TID.TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift;
1210 if (getIBit(insn) == 0) {
1211 // For pre- and post-indexed case, add a reg0 operand (Addressing Mode #2).
1212 // Otherwise, skip the reg operand since for addrmode_imm12, Rn has already
1215 MI.addOperand(MCOperand::CreateReg(0));
1219 unsigned Imm12 = slice(insn, 11, 0);
1220 if (Opcode == ARM::LDRBi12 || Opcode == ARM::LDRi12 ||
1221 Opcode == ARM::STRBi12 || Opcode == ARM::STRi12) {
1222 // Disassemble the 12-bit immediate offset, which is the second operand in
1223 // $addrmode_imm12 => (ops GPR:$base, i32imm:$offsimm).
1224 int Offset = AddrOpcode == ARM_AM::add ? 1 * Imm12 : -1 * Imm12;
1225 MI.addOperand(MCOperand::CreateImm(Offset));
1227 // Disassemble the 12-bit immediate offset, which is the second operand in
1228 // $am2offset => (ops GPR, i32imm).
1229 unsigned Offset = ARM_AM::getAM2Opc(AddrOpcode, Imm12, ARM_AM::no_shift,
1231 MI.addOperand(MCOperand::CreateImm(Offset));
1235 // If Inst{25} = 1 and Inst{4} != 0, we should reject this as invalid.
1236 if (slice(insn,4,4) == 1)
1239 // Disassemble the offset reg (Rm), shift type, and immediate shift length.
1240 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1242 // Inst{6-5} encodes the shift opcode.
1243 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1244 // Inst{11-7} encodes the imm5 shift amount.
1245 unsigned ShImm = slice(insn, 11, 7);
1247 // A8.4.1. Possible rrx or shift amount of 32...
1248 getImmShiftSE(ShOp, ShImm);
1249 MI.addOperand(MCOperand::CreateImm(
1250 ARM_AM::getAM2Opc(AddrOpcode, ShImm, ShOp, IndexMode)));
1257 static bool DisassembleLdFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1258 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1259 return DisassembleLdStFrm(MI, Opcode, insn, NumOps, NumOpsAdded, false, B);
1262 static bool DisassembleStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1263 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1264 return DisassembleLdStFrm(MI, Opcode, insn, NumOps, NumOpsAdded, true, B);
1267 static bool HasDualReg(unsigned Opcode) {
1271 case ARM::LDRD: case ARM::LDRD_PRE: case ARM::LDRD_POST:
1272 case ARM::STRD: case ARM::STRD_PRE: case ARM::STRD_POST:
1277 static bool DisassembleLdStMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1278 unsigned short NumOps, unsigned &NumOpsAdded, bool isStore, BO B) {
1280 const TargetInstrDesc &TID = ARMInsts[Opcode];
1281 bool isPrePost = isPrePostLdSt(TID.TSFlags);
1282 const TargetOperandInfo *OpInfo = TID.OpInfo;
1283 if (!OpInfo) return false;
1285 unsigned &OpIdx = NumOpsAdded;
1289 assert(((!isStore && TID.getNumDefs() > 0) ||
1290 (isStore && (TID.getNumDefs() == 0 || isPrePost)))
1291 && "Invalid arguments");
1293 // Operand 0 of a pre- and post-indexed store is the address base writeback.
1294 if (isPrePost && isStore) {
1295 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1296 "Reg operand expected");
1297 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1302 // Disassemble the dst/src operand.
1303 if (OpIdx >= NumOps)
1306 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1307 "Reg operand expected");
1308 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1312 // Fill in LDRD and STRD's second operand Rt operand.
1313 if (HasDualReg(Opcode)) {
1314 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1315 decodeRd(insn) + 1)));
1319 // After dst of a pre- and post-indexed load is the address base writeback.
1320 if (isPrePost && !isStore) {
1321 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1322 "Reg operand expected");
1323 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1328 // Disassemble the base operand.
1329 if (OpIdx >= NumOps)
1332 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1333 "Reg operand expected");
1334 assert((!isPrePost || (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1))
1335 && "Offset mode or tied_to operand expected");
1336 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1340 // For reg/reg form, base reg is followed by +/- reg.
1341 // For immediate form, it is followed by +/- imm8.
1342 // See also ARMAddressingModes.h (Addressing Mode #3).
1343 if (OpIdx + 1 >= NumOps)
1346 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
1347 (OpInfo[OpIdx+1].RegClass < 0) &&
1348 "Expect 1 reg operand followed by 1 imm operand");
1350 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1351 unsigned IndexMode =
1352 (TID.TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift;
1353 if (getAM3IBit(insn) == 1) {
1354 MI.addOperand(MCOperand::CreateReg(0));
1356 // Disassemble the 8-bit immediate offset.
1357 unsigned Imm4H = (insn >> ARMII::ImmHiShift) & 0xF;
1358 unsigned Imm4L = insn & 0xF;
1359 unsigned Offset = ARM_AM::getAM3Opc(AddrOpcode, (Imm4H << 4) | Imm4L,
1361 MI.addOperand(MCOperand::CreateImm(Offset));
1363 // Disassemble the offset reg (Rm).
1364 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1366 unsigned Offset = ARM_AM::getAM3Opc(AddrOpcode, 0, IndexMode);
1367 MI.addOperand(MCOperand::CreateImm(Offset));
1374 static bool DisassembleLdMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1375 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1376 return DisassembleLdStMiscFrm(MI, Opcode, insn, NumOps, NumOpsAdded, false,
1380 static bool DisassembleStMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1381 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1382 return DisassembleLdStMiscFrm(MI, Opcode, insn, NumOps, NumOpsAdded, true, B);
1385 // The algorithm for disassembly of LdStMulFrm is different from others because
1386 // it explicitly populates the two predicate operands after the base register.
1387 // After that, we need to populate the reglist with each affected register
1388 // encoded as an MCOperand.
1389 static bool DisassembleLdStMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1390 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1392 assert(NumOps >= 4 && "LdStMulFrm expects NumOps >= 4");
1395 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1397 // Writeback to base, if necessary.
1398 if (Opcode == ARM::LDMIA_UPD || Opcode == ARM::STMIA_UPD ||
1399 Opcode == ARM::LDMDA_UPD || Opcode == ARM::STMDA_UPD ||
1400 Opcode == ARM::LDMDB_UPD || Opcode == ARM::STMDB_UPD ||
1401 Opcode == ARM::LDMIB_UPD || Opcode == ARM::STMIB_UPD) {
1402 MI.addOperand(MCOperand::CreateReg(Base));
1406 // Add the base register operand.
1407 MI.addOperand(MCOperand::CreateReg(Base));
1409 // Handling the two predicate operands before the reglist.
1410 int64_t CondVal = getCondField(insn);
1413 MI.addOperand(MCOperand::CreateImm(CondVal));
1414 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
1418 // Fill the variadic part of reglist.
1419 unsigned RegListBits = insn & ((1 << 16) - 1);
1420 for (unsigned i = 0; i < 16; ++i) {
1421 if ((RegListBits >> i) & 1) {
1422 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1431 // LDREX, LDREXB, LDREXH: Rd Rn
1432 // LDREXD: Rd Rd+1 Rn
1433 // STREX, STREXB, STREXH: Rd Rm Rn
1434 // STREXD: Rd Rm Rm+1 Rn
1436 // SWP, SWPB: Rd Rm Rn
1437 static bool DisassembleLdStExFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1438 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1440 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1441 if (!OpInfo) return false;
1443 unsigned &OpIdx = NumOpsAdded;
1448 && OpInfo[0].RegClass == ARM::GPRRegClassID
1449 && OpInfo[1].RegClass == ARM::GPRRegClassID
1450 && "Expect 2 reg operands");
1452 bool isStore = slice(insn, 20, 20) == 0;
1453 bool isDW = (Opcode == ARM::LDREXD || Opcode == ARM::STREXD);
1455 // Add the destination operand.
1456 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1460 // Store register Exclusive needs a source operand.
1462 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1467 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1468 decodeRm(insn)+1)));
1472 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1473 decodeRd(insn)+1)));
1477 // Finally add the pointer operand.
1478 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1485 // Misc. Arithmetic Instructions.
1487 // PKHBT, PKHTB: Rd Rn Rm , LSL/ASR #imm5
1488 // RBIT, REV, REV16, REVSH: Rd Rm
1489 static bool DisassembleArithMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1490 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1492 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1493 unsigned &OpIdx = NumOpsAdded;
1498 && OpInfo[0].RegClass == ARM::GPRRegClassID
1499 && OpInfo[1].RegClass == ARM::GPRRegClassID
1500 && "Expect 2 reg operands");
1502 bool ThreeReg = NumOps > 2 && OpInfo[2].RegClass == ARM::GPRRegClassID;
1504 // Sanity check the registers, which should not be 15.
1505 if (decodeRd(insn) == 15 || decodeRm(insn) == 15)
1507 if (ThreeReg && decodeRn(insn) == 15)
1510 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1515 assert(NumOps >= 4 && "Expect >= 4 operands");
1516 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1521 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1525 // If there is still an operand info left which is an immediate operand, add
1526 // an additional imm5 LSL/ASR operand.
1527 if (ThreeReg && OpInfo[OpIdx].RegClass < 0
1528 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1529 // Extract the 5-bit immediate field Inst{11-7}.
1530 unsigned ShiftAmt = (insn >> ARMII::ShiftShift) & 0x1F;
1531 ARM_AM::ShiftOpc Opc = ARM_AM::no_shift;
1532 if (Opcode == ARM::PKHBT)
1534 else if (Opcode == ARM::PKHTB)
1536 getImmShiftSE(Opc, ShiftAmt);
1537 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(Opc, ShiftAmt)));
1544 /// DisassembleSatFrm - Disassemble saturate instructions:
1545 /// SSAT, SSAT16, USAT, and USAT16.
1546 static bool DisassembleSatFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1547 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1550 // if d == 15 || n == 15 then UNPREDICTABLE;
1551 if (decodeRd(insn) == 15 || decodeRm(insn) == 15)
1554 const TargetInstrDesc &TID = ARMInsts[Opcode];
1555 NumOpsAdded = TID.getNumOperands() - 2; // ignore predicate operands
1557 // Disassemble register def.
1558 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1561 unsigned Pos = slice(insn, 20, 16);
1562 if (Opcode == ARM::SSAT || Opcode == ARM::SSAT16)
1564 MI.addOperand(MCOperand::CreateImm(Pos));
1566 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1569 if (NumOpsAdded == 4) {
1570 ARM_AM::ShiftOpc Opc = (slice(insn, 6, 6) != 0 ? ARM_AM::asr : ARM_AM::lsl);
1571 // Inst{11-7} encodes the imm5 shift amount.
1572 unsigned ShAmt = slice(insn, 11, 7);
1574 // A8.6.183. Possible ASR shift amount of 32...
1575 if (Opc == ARM_AM::asr)
1578 Opc = ARM_AM::no_shift;
1580 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(Opc, ShAmt)));
1585 // Extend instructions.
1586 // SXT* and UXT*: Rd [Rn] Rm [rot_imm].
1587 // The 2nd operand register is Rn and the 3rd operand regsiter is Rm for the
1588 // three register operand form. Otherwise, Rn=0b1111 and only Rm is used.
1589 static bool DisassembleExtFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1590 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1593 // if d == 15 || m == 15 then UNPREDICTABLE;
1594 if (decodeRd(insn) == 15 || decodeRm(insn) == 15)
1597 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1598 unsigned &OpIdx = NumOpsAdded;
1603 && OpInfo[0].RegClass == ARM::GPRRegClassID
1604 && OpInfo[1].RegClass == ARM::GPRRegClassID
1605 && "Expect 2 reg operands");
1607 bool ThreeReg = NumOps > 2 && OpInfo[2].RegClass == ARM::GPRRegClassID;
1609 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1614 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1619 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1623 // If there is still an operand info left which is an immediate operand, add
1624 // an additional rotate immediate operand.
1625 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
1626 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1627 // Extract the 2-bit rotate field Inst{11-10}.
1628 unsigned rot = (insn >> ARMII::ExtRotImmShift) & 3;
1629 // Rotation by 8, 16, or 24 bits.
1630 MI.addOperand(MCOperand::CreateImm(rot << 3));
1637 /////////////////////////////////////
1639 // Utility Functions For VFP //
1641 /////////////////////////////////////
1643 // Extract/Decode Dd/Sd:
1645 // SP => d = UInt(Vd:D)
1646 // DP => d = UInt(D:Vd)
1647 static unsigned decodeVFPRd(uint32_t insn, bool isSPVFP) {
1648 return isSPVFP ? (decodeRd(insn) << 1 | getDBit(insn))
1649 : (decodeRd(insn) | getDBit(insn) << 4);
1652 // Extract/Decode Dn/Sn:
1654 // SP => n = UInt(Vn:N)
1655 // DP => n = UInt(N:Vn)
1656 static unsigned decodeVFPRn(uint32_t insn, bool isSPVFP) {
1657 return isSPVFP ? (decodeRn(insn) << 1 | getNBit(insn))
1658 : (decodeRn(insn) | getNBit(insn) << 4);
1661 // Extract/Decode Dm/Sm:
1663 // SP => m = UInt(Vm:M)
1664 // DP => m = UInt(M:Vm)
1665 static unsigned decodeVFPRm(uint32_t insn, bool isSPVFP) {
1666 return isSPVFP ? (decodeRm(insn) << 1 | getMBit(insn))
1667 : (decodeRm(insn) | getMBit(insn) << 4);
1671 static APInt VFPExpandImm(unsigned char byte, unsigned N) {
1672 assert(N == 32 || N == 64);
1675 unsigned bit6 = slice(byte, 6, 6);
1677 Result = slice(byte, 7, 7) << 31 | slice(byte, 5, 0) << 19;
1679 Result |= 0x1f << 25;
1681 Result |= 0x1 << 30;
1683 Result = (uint64_t)slice(byte, 7, 7) << 63 |
1684 (uint64_t)slice(byte, 5, 0) << 48;
1686 Result |= 0xffULL << 54;
1688 Result |= 0x1ULL << 62;
1690 return APInt(N, Result);
1693 // VFP Unary Format Instructions:
1695 // VCMP[E]ZD, VCMP[E]ZS: compares one floating-point register with zero
1696 // VCVTDS, VCVTSD: converts between double-precision and single-precision
1697 // The rest of the instructions have homogeneous [VFP]Rd and [VFP]Rm registers.
1698 static bool DisassembleVFPUnaryFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1699 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1701 assert(NumOps >= 1 && "VFPUnaryFrm expects NumOps >= 1");
1703 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1704 unsigned &OpIdx = NumOpsAdded;
1708 unsigned RegClass = OpInfo[OpIdx].RegClass;
1709 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1710 "Reg operand expected");
1711 bool isSP = (RegClass == ARM::SPRRegClassID);
1713 MI.addOperand(MCOperand::CreateReg(
1714 getRegisterEnum(B, RegClass, decodeVFPRd(insn, isSP))));
1717 // Early return for compare with zero instructions.
1718 if (Opcode == ARM::VCMPEZD || Opcode == ARM::VCMPEZS
1719 || Opcode == ARM::VCMPZD || Opcode == ARM::VCMPZS)
1722 RegClass = OpInfo[OpIdx].RegClass;
1723 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1724 "Reg operand expected");
1725 isSP = (RegClass == ARM::SPRRegClassID);
1727 MI.addOperand(MCOperand::CreateReg(
1728 getRegisterEnum(B, RegClass, decodeVFPRm(insn, isSP))));
1734 // All the instructions have homogeneous [VFP]Rd, [VFP]Rn, and [VFP]Rm regs.
1735 // Some of them have operand constraints which tie the first operand in the
1736 // InOperandList to that of the dst. As far as asm printing is concerned, this
1737 // tied_to operand is simply skipped.
1738 static bool DisassembleVFPBinaryFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1739 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1741 assert(NumOps >= 3 && "VFPBinaryFrm expects NumOps >= 3");
1743 const TargetInstrDesc &TID = ARMInsts[Opcode];
1744 const TargetOperandInfo *OpInfo = TID.OpInfo;
1745 unsigned &OpIdx = NumOpsAdded;
1749 unsigned RegClass = OpInfo[OpIdx].RegClass;
1750 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1751 "Reg operand expected");
1752 bool isSP = (RegClass == ARM::SPRRegClassID);
1754 MI.addOperand(MCOperand::CreateReg(
1755 getRegisterEnum(B, RegClass, decodeVFPRd(insn, isSP))));
1758 // Skip tied_to operand constraint.
1759 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
1760 assert(NumOps >= 4 && "Expect >=4 operands");
1761 MI.addOperand(MCOperand::CreateReg(0));
1765 MI.addOperand(MCOperand::CreateReg(
1766 getRegisterEnum(B, RegClass, decodeVFPRn(insn, isSP))));
1769 MI.addOperand(MCOperand::CreateReg(
1770 getRegisterEnum(B, RegClass, decodeVFPRm(insn, isSP))));
1776 // A8.6.295 vcvt (floating-point <-> integer)
1777 // Int to FP: VSITOD, VSITOS, VUITOD, VUITOS
1778 // FP to Int: VTOSI[Z|R]D, VTOSI[Z|R]S, VTOUI[Z|R]D, VTOUI[Z|R]S
1780 // A8.6.297 vcvt (floating-point and fixed-point)
1781 // Dd|Sd Dd|Sd(TIED_TO) #fbits(= 16|32 - UInt(imm4:i))
1782 static bool DisassembleVFPConv1Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1783 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1785 assert(NumOps >= 2 && "VFPConv1Frm expects NumOps >= 2");
1787 const TargetInstrDesc &TID = ARMInsts[Opcode];
1788 const TargetOperandInfo *OpInfo = TID.OpInfo;
1789 if (!OpInfo) return false;
1791 bool SP = slice(insn, 8, 8) == 0; // A8.6.295 & A8.6.297
1792 bool fixed_point = slice(insn, 17, 17) == 1; // A8.6.297
1793 unsigned RegClassID = SP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1797 assert(NumOps >= 3 && "Expect >= 3 operands");
1798 int size = slice(insn, 7, 7) == 0 ? 16 : 32;
1799 int fbits = size - (slice(insn,3,0) << 1 | slice(insn,5,5));
1800 MI.addOperand(MCOperand::CreateReg(
1801 getRegisterEnum(B, RegClassID,
1802 decodeVFPRd(insn, SP))));
1804 assert(TID.getOperandConstraint(1, TOI::TIED_TO) != -1 &&
1805 "Tied to operand expected");
1806 MI.addOperand(MI.getOperand(0));
1808 assert(OpInfo[2].RegClass < 0 && !OpInfo[2].isPredicate() &&
1809 !OpInfo[2].isOptionalDef() && "Imm operand expected");
1810 MI.addOperand(MCOperand::CreateImm(fbits));
1815 // The Rd (destination) and Rm (source) bits have different interpretations
1816 // depending on their single-precisonness.
1818 if (slice(insn, 18, 18) == 1) { // to_integer operation
1819 d = decodeVFPRd(insn, true /* Is Single Precision */);
1820 MI.addOperand(MCOperand::CreateReg(
1821 getRegisterEnum(B, ARM::SPRRegClassID, d)));
1822 m = decodeVFPRm(insn, SP);
1823 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, m)));
1825 d = decodeVFPRd(insn, SP);
1826 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, d)));
1827 m = decodeVFPRm(insn, true /* Is Single Precision */);
1828 MI.addOperand(MCOperand::CreateReg(
1829 getRegisterEnum(B, ARM::SPRRegClassID, m)));
1837 // VMOVRS - A8.6.330
1838 // Rt => Rd; Sn => UInt(Vn:N)
1839 static bool DisassembleVFPConv2Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1840 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1842 assert(NumOps >= 2 && "VFPConv2Frm expects NumOps >= 2");
1844 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1846 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1847 decodeVFPRn(insn, true))));
1852 // VMOVRRD - A8.6.332
1853 // Rt => Rd; Rt2 => Rn; Dm => UInt(M:Vm)
1855 // VMOVRRS - A8.6.331
1856 // Rt => Rd; Rt2 => Rn; Sm => UInt(Vm:M); Sm1 = Sm+1
1857 static bool DisassembleVFPConv3Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1858 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1860 assert(NumOps >= 3 && "VFPConv3Frm expects NumOps >= 3");
1862 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1863 unsigned &OpIdx = NumOpsAdded;
1865 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1867 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1871 if (OpInfo[OpIdx].RegClass == ARM::SPRRegClassID) {
1872 unsigned Sm = decodeVFPRm(insn, true);
1873 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1875 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1879 MI.addOperand(MCOperand::CreateReg(
1880 getRegisterEnum(B, ARM::DPRRegClassID,
1881 decodeVFPRm(insn, false))));
1887 // VMOVSR - A8.6.330
1888 // Rt => Rd; Sn => UInt(Vn:N)
1889 static bool DisassembleVFPConv4Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1890 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1892 assert(NumOps >= 2 && "VFPConv4Frm expects NumOps >= 2");
1894 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1895 decodeVFPRn(insn, true))));
1896 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1902 // VMOVDRR - A8.6.332
1903 // Rt => Rd; Rt2 => Rn; Dm => UInt(M:Vm)
1905 // VMOVRRS - A8.6.331
1906 // Rt => Rd; Rt2 => Rn; Sm => UInt(Vm:M); Sm1 = Sm+1
1907 static bool DisassembleVFPConv5Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1908 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1910 assert(NumOps >= 3 && "VFPConv5Frm expects NumOps >= 3");
1912 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1913 unsigned &OpIdx = NumOpsAdded;
1917 if (OpInfo[OpIdx].RegClass == ARM::SPRRegClassID) {
1918 unsigned Sm = decodeVFPRm(insn, true);
1919 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1921 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1925 MI.addOperand(MCOperand::CreateReg(
1926 getRegisterEnum(B, ARM::DPRRegClassID,
1927 decodeVFPRm(insn, false))));
1931 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1933 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1939 // VFP Load/Store Instructions.
1940 // VLDRD, VLDRS, VSTRD, VSTRS
1941 static bool DisassembleVFPLdStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1942 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1944 assert(NumOps >= 3 && "VFPLdStFrm expects NumOps >= 3");
1946 bool isSPVFP = (Opcode == ARM::VLDRS || Opcode == ARM::VSTRS);
1947 unsigned RegClassID = isSPVFP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1949 // Extract Dd/Sd for operand 0.
1950 unsigned RegD = decodeVFPRd(insn, isSPVFP);
1952 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, RegD)));
1954 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1955 MI.addOperand(MCOperand::CreateReg(Base));
1957 // Next comes the AM5 Opcode.
1958 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1959 unsigned char Imm8 = insn & 0xFF;
1960 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(AddrOpcode, Imm8)));
1967 // VFP Load/Store Multiple Instructions.
1968 // We have an optional write back reg, the base, and two predicate operands.
1969 // It is then followed by a reglist of either DPR(s) or SPR(s).
1971 // VLDMD[_UPD], VLDMS[_UPD], VSTMD[_UPD], VSTMS[_UPD]
1972 static bool DisassembleVFPLdStMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1973 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1975 assert(NumOps >= 4 && "VFPLdStMulFrm expects NumOps >= 4");
1977 unsigned &OpIdx = NumOpsAdded;
1981 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1983 // Writeback to base, if necessary.
1984 if (Opcode == ARM::VLDMDIA_UPD || Opcode == ARM::VLDMSIA_UPD ||
1985 Opcode == ARM::VLDMDDB_UPD || Opcode == ARM::VLDMSDB_UPD ||
1986 Opcode == ARM::VSTMDIA_UPD || Opcode == ARM::VSTMSIA_UPD ||
1987 Opcode == ARM::VSTMDDB_UPD || Opcode == ARM::VSTMSDB_UPD) {
1988 MI.addOperand(MCOperand::CreateReg(Base));
1992 MI.addOperand(MCOperand::CreateReg(Base));
1994 // Handling the two predicate operands before the reglist.
1995 int64_t CondVal = getCondField(insn);
1998 MI.addOperand(MCOperand::CreateImm(CondVal));
1999 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
2003 bool isSPVFP = (Opcode == ARM::VLDMSIA ||
2004 Opcode == ARM::VLDMSIA_UPD || Opcode == ARM::VLDMSDB_UPD ||
2005 Opcode == ARM::VSTMSIA ||
2006 Opcode == ARM::VSTMSIA_UPD || Opcode == ARM::VSTMSDB_UPD);
2007 unsigned RegClassID = isSPVFP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
2010 unsigned RegD = decodeVFPRd(insn, isSPVFP);
2012 // Fill the variadic part of reglist.
2013 unsigned char Imm8 = insn & 0xFF;
2014 unsigned Regs = isSPVFP ? Imm8 : Imm8/2;
2016 // Apply some sanity checks before proceeding.
2017 if (Regs == 0 || (RegD + Regs) > 32 || (!isSPVFP && Regs > 16))
2020 for (unsigned i = 0; i < Regs; ++i) {
2021 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID,
2029 // Misc. VFP Instructions.
2030 // FMSTAT (vmrs with Rt=0b1111, i.e., to apsr_nzcv and no register operand)
2031 // FCONSTD (DPR and a VFPf64Imm operand)
2032 // FCONSTS (SPR and a VFPf32Imm operand)
2033 // VMRS/VMSR (GPR operand)
2034 static bool DisassembleVFPMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2035 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2037 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
2038 unsigned &OpIdx = NumOpsAdded;
2042 if (Opcode == ARM::FMSTAT)
2045 assert(NumOps >= 2 && "VFPMiscFrm expects >=2 operands");
2047 unsigned RegEnum = 0;
2048 switch (OpInfo[0].RegClass) {
2049 case ARM::DPRRegClassID:
2050 RegEnum = getRegisterEnum(B, ARM::DPRRegClassID, decodeVFPRd(insn, false));
2052 case ARM::SPRRegClassID:
2053 RegEnum = getRegisterEnum(B, ARM::SPRRegClassID, decodeVFPRd(insn, true));
2055 case ARM::GPRRegClassID:
2056 RegEnum = getRegisterEnum(B, ARM::GPRRegClassID, decodeRd(insn));
2059 assert(0 && "Invalid reg class id");
2063 MI.addOperand(MCOperand::CreateReg(RegEnum));
2066 // Extract/decode the f64/f32 immediate.
2067 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2068 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2069 // The asm syntax specifies the floating point value, not the 8-bit literal.
2070 APInt immRaw = VFPExpandImm(slice(insn,19,16) << 4 | slice(insn, 3, 0),
2071 Opcode == ARM::FCONSTD ? 64 : 32);
2072 APFloat immFP = APFloat(immRaw, true);
2073 double imm = Opcode == ARM::FCONSTD ? immFP.convertToDouble() :
2074 immFP.convertToFloat();
2075 MI.addOperand(MCOperand::CreateFPImm(imm));
2083 // DisassembleThumbFrm() is defined in ThumbDisassemblerCore.h file.
2084 #include "ThumbDisassemblerCore.h"
2086 /////////////////////////////////////////////////////
2088 // Utility Functions For ARM Advanced SIMD //
2090 /////////////////////////////////////////////////////
2092 // The following NEON namings are based on A8.6.266 VABA, VABAL. Notice that
2093 // A8.6.303 VDUP (ARM core register)'s D/Vd pair is the N/Vn pair of VABA/VABAL.
2095 // A7.3 Register encoding
2097 // Extract/Decode NEON D/Vd:
2099 // Note that for quadword, Qd = UInt(D:Vd<3:1>) = Inst{22:15-13}, whereas for
2100 // doubleword, Dd = UInt(D:Vd). We compensate for this difference by
2101 // handling it in the getRegisterEnum() utility function.
2102 // D = Inst{22}, Vd = Inst{15-12}
2103 static unsigned decodeNEONRd(uint32_t insn) {
2104 return ((insn >> ARMII::NEON_D_BitShift) & 1) << 4
2105 | ((insn >> ARMII::NEON_RegRdShift) & ARMII::NEONRegMask);
2108 // Extract/Decode NEON N/Vn:
2110 // Note that for quadword, Qn = UInt(N:Vn<3:1>) = Inst{7:19-17}, whereas for
2111 // doubleword, Dn = UInt(N:Vn). We compensate for this difference by
2112 // handling it in the getRegisterEnum() utility function.
2113 // N = Inst{7}, Vn = Inst{19-16}
2114 static unsigned decodeNEONRn(uint32_t insn) {
2115 return ((insn >> ARMII::NEON_N_BitShift) & 1) << 4
2116 | ((insn >> ARMII::NEON_RegRnShift) & ARMII::NEONRegMask);
2119 // Extract/Decode NEON M/Vm:
2121 // Note that for quadword, Qm = UInt(M:Vm<3:1>) = Inst{5:3-1}, whereas for
2122 // doubleword, Dm = UInt(M:Vm). We compensate for this difference by
2123 // handling it in the getRegisterEnum() utility function.
2124 // M = Inst{5}, Vm = Inst{3-0}
2125 static unsigned decodeNEONRm(uint32_t insn) {
2126 return ((insn >> ARMII::NEON_M_BitShift) & 1) << 4
2127 | ((insn >> ARMII::NEON_RegRmShift) & ARMII::NEONRegMask);
2138 } // End of unnamed namespace
2140 // size field -> Inst{11-10}
2141 // index_align field -> Inst{7-4}
2143 // The Lane Index interpretation depends on the Data Size:
2144 // 8 (encoded as size = 0b00) -> Index = index_align[3:1]
2145 // 16 (encoded as size = 0b01) -> Index = index_align[3:2]
2146 // 32 (encoded as size = 0b10) -> Index = index_align[3]
2148 // Ref: A8.6.317 VLD4 (single 4-element structure to one lane).
2149 static unsigned decodeLaneIndex(uint32_t insn) {
2150 unsigned size = insn >> 10 & 3;
2151 assert((size == 0 || size == 1 || size == 2) &&
2152 "Encoding error: size should be either 0, 1, or 2");
2154 unsigned index_align = insn >> 4 & 0xF;
2155 return (index_align >> 1) >> size;
2158 // imm64 = AdvSIMDExpandImm(op, cmode, i:imm3:imm4)
2159 // op = Inst{5}, cmode = Inst{11-8}
2160 // i = Inst{24} (ARM architecture)
2161 // imm3 = Inst{18-16}, imm4 = Inst{3-0}
2162 // Ref: Table A7-15 Modified immediate values for Advanced SIMD instructions.
2163 static uint64_t decodeN1VImm(uint32_t insn, ElemSize esize) {
2164 unsigned char op = (insn >> 5) & 1;
2165 unsigned char cmode = (insn >> 8) & 0xF;
2166 unsigned char Imm8 = ((insn >> 24) & 1) << 7 |
2167 ((insn >> 16) & 7) << 4 |
2169 return (op << 12) | (cmode << 8) | Imm8;
2172 // A8.6.339 VMUL, VMULL (by scalar)
2173 // ESize16 => m = Inst{2-0} (Vm<2:0>) D0-D7
2174 // ESize32 => m = Inst{3-0} (Vm<3:0>) D0-D15
2175 static unsigned decodeRestrictedDm(uint32_t insn, ElemSize esize) {
2182 assert(0 && "Unreachable code!");
2187 // A8.6.339 VMUL, VMULL (by scalar)
2188 // ESize16 => index = Inst{5:3} (M:Vm<3>) D0-D7
2189 // ESize32 => index = Inst{5} (M) D0-D15
2190 static unsigned decodeRestrictedDmIndex(uint32_t insn, ElemSize esize) {
2193 return (((insn >> 5) & 1) << 1) | ((insn >> 3) & 1);
2195 return (insn >> 5) & 1;
2197 assert(0 && "Unreachable code!");
2202 // A8.6.296 VCVT (between floating-point and fixed-point, Advanced SIMD)
2203 // (64 - <fbits>) is encoded as imm6, i.e., Inst{21-16}.
2204 static unsigned decodeVCVTFractionBits(uint32_t insn) {
2205 return 64 - ((insn >> 16) & 0x3F);
2208 // A8.6.302 VDUP (scalar)
2209 // ESize8 => index = Inst{19-17}
2210 // ESize16 => index = Inst{19-18}
2211 // ESize32 => index = Inst{19}
2212 static unsigned decodeNVLaneDupIndex(uint32_t insn, ElemSize esize) {
2215 return (insn >> 17) & 7;
2217 return (insn >> 18) & 3;
2219 return (insn >> 19) & 1;
2221 assert(0 && "Unspecified element size!");
2226 // A8.6.328 VMOV (ARM core register to scalar)
2227 // A8.6.329 VMOV (scalar to ARM core register)
2228 // ESize8 => index = Inst{21:6-5}
2229 // ESize16 => index = Inst{21:6}
2230 // ESize32 => index = Inst{21}
2231 static unsigned decodeNVLaneOpIndex(uint32_t insn, ElemSize esize) {
2234 return ((insn >> 21) & 1) << 2 | ((insn >> 5) & 3);
2236 return ((insn >> 21) & 1) << 1 | ((insn >> 6) & 1);
2238 return ((insn >> 21) & 1);
2240 assert(0 && "Unspecified element size!");
2245 // Imm6 = Inst{21-16}, L = Inst{7}
2247 // LeftShift == true (A8.6.367 VQSHL, A8.6.387 VSLI):
2249 // '0001xxx' => esize = 8; shift_amount = imm6 - 8
2250 // '001xxxx' => esize = 16; shift_amount = imm6 - 16
2251 // '01xxxxx' => esize = 32; shift_amount = imm6 - 32
2252 // '1xxxxxx' => esize = 64; shift_amount = imm6
2254 // LeftShift == false (A8.6.376 VRSHR, A8.6.368 VQSHRN):
2256 // '0001xxx' => esize = 8; shift_amount = 16 - imm6
2257 // '001xxxx' => esize = 16; shift_amount = 32 - imm6
2258 // '01xxxxx' => esize = 32; shift_amount = 64 - imm6
2259 // '1xxxxxx' => esize = 64; shift_amount = 64 - imm6
2261 static unsigned decodeNVSAmt(uint32_t insn, bool LeftShift) {
2262 ElemSize esize = ESizeNA;
2263 unsigned L = (insn >> 7) & 1;
2264 unsigned imm6 = (insn >> 16) & 0x3F;
2268 else if (imm6 >> 4 == 1)
2270 else if (imm6 >> 5 == 1)
2273 assert(0 && "Wrong encoding of Inst{7:21-16}!");
2278 return esize == ESize64 ? imm6 : (imm6 - esize);
2280 return esize == ESize64 ? (esize - imm6) : (2*esize - imm6);
2284 // Imm4 = Inst{11-8}
2285 static unsigned decodeN3VImm(uint32_t insn) {
2286 return (insn >> 8) & 0xF;
2290 // D[d] D[d2] ... Rn [TIED_TO Rn] align [Rm]
2292 // D[d] D[d2] ... Rn [TIED_TO Rn] align [Rm] TIED_TO ... imm(idx)
2294 // Rn [TIED_TO Rn] align [Rm] D[d] D[d2] ...
2296 // Rn [TIED_TO Rn] align [Rm] D[d] D[d2] ... [imm(idx)]
2298 // Correctly set VLD*/VST*'s TIED_TO GPR, as the asm printer needs it.
2299 static bool DisassembleNLdSt0(MCInst &MI, unsigned Opcode, uint32_t insn,
2300 unsigned short NumOps, unsigned &NumOpsAdded, bool Store, bool DblSpaced,
2301 unsigned alignment, BO B) {
2303 const TargetInstrDesc &TID = ARMInsts[Opcode];
2304 const TargetOperandInfo *OpInfo = TID.OpInfo;
2306 // At least one DPR register plus addressing mode #6.
2307 assert(NumOps >= 3 && "Expect >= 3 operands");
2309 unsigned &OpIdx = NumOpsAdded;
2313 // We have homogeneous NEON registers for Load/Store.
2314 unsigned RegClass = 0;
2316 // Double-spaced registers have increments of 2.
2317 unsigned Inc = DblSpaced ? 2 : 1;
2319 unsigned Rn = decodeRn(insn);
2320 unsigned Rm = decodeRm(insn);
2321 unsigned Rd = decodeNEONRd(insn);
2323 // A7.7.1 Advanced SIMD addressing mode.
2326 // LLVM Addressing Mode #6.
2327 unsigned RmEnum = 0;
2329 RmEnum = getRegisterEnum(B, ARM::GPRRegClassID, Rm);
2332 // Consume possible WB, AddrMode6, possible increment reg, the DPR/QPR's,
2333 // then possible lane index.
2334 assert(OpIdx < NumOps && OpInfo[0].RegClass == ARM::GPRRegClassID &&
2335 "Reg operand expected");
2338 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2343 assert((OpIdx+1) < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
2344 OpInfo[OpIdx + 1].RegClass < 0 && "Addrmode #6 Operands expected");
2345 // addrmode6 := (ops GPR:$addr, i32imm)
2346 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2348 MI.addOperand(MCOperand::CreateImm(alignment)); // Alignment
2352 MI.addOperand(MCOperand::CreateReg(RmEnum));
2356 assert(OpIdx < NumOps &&
2357 (OpInfo[OpIdx].RegClass == ARM::DPRRegClassID ||
2358 OpInfo[OpIdx].RegClass == ARM::QPRRegClassID) &&
2359 "Reg operand expected");
2361 RegClass = OpInfo[OpIdx].RegClass;
2362 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2363 MI.addOperand(MCOperand::CreateReg(
2364 getRegisterEnum(B, RegClass, Rd)));
2369 // Handle possible lane index.
2370 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2371 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2372 MI.addOperand(MCOperand::CreateImm(decodeLaneIndex(insn)));
2377 // Consume the DPR/QPR's, possible WB, AddrMode6, possible incrment reg,
2378 // possible TIED_TO DPR/QPR's (ignored), then possible lane index.
2379 RegClass = OpInfo[0].RegClass;
2381 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2382 MI.addOperand(MCOperand::CreateReg(
2383 getRegisterEnum(B, RegClass, Rd)));
2389 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2394 assert((OpIdx+1) < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
2395 OpInfo[OpIdx + 1].RegClass < 0 && "Addrmode #6 Operands expected");
2396 // addrmode6 := (ops GPR:$addr, i32imm)
2397 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2399 MI.addOperand(MCOperand::CreateImm(alignment)); // Alignment
2403 MI.addOperand(MCOperand::CreateReg(RmEnum));
2407 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2408 assert(TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1 &&
2409 "Tied to operand expected");
2410 MI.addOperand(MCOperand::CreateReg(0));
2414 // Handle possible lane index.
2415 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2416 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2417 MI.addOperand(MCOperand::CreateImm(decodeLaneIndex(insn)));
2422 // Accessing registers past the end of the NEON register file is not
2430 // A8.6.308, A8.6.311, A8.6.314, A8.6.317.
2431 static bool Align4OneLaneInst(unsigned elem, unsigned size,
2432 unsigned index_align, unsigned & alignment) {
2440 return slice(index_align, 0, 0) == 0;
2441 else if (size == 1) {
2442 bits = slice(index_align, 1, 0);
2443 if (bits != 0 && bits != 1)
2448 } else if (size == 2) {
2449 bits = slice(index_align, 2, 0);
2450 if (bits != 0 && bits != 3)
2460 if (slice(index_align, 0, 0) == 1)
2464 if (slice(index_align, 0, 0) == 1)
2467 } else if (size == 2) {
2468 if (slice(index_align, 1, 1) != 0)
2470 if (slice(index_align, 0, 0) == 1)
2478 if (slice(index_align, 0, 0) != 0)
2482 if (slice(index_align, 0, 0) != 0)
2486 } else if (size == 2) {
2487 if (slice(index_align, 1, 0) != 0)
2495 if (slice(index_align, 0, 0) == 1)
2499 if (slice(index_align, 0, 0) == 1)
2502 } else if (size == 2) {
2503 bits = slice(index_align, 1, 0);
2517 // If L (Inst{21}) == 0, store instructions.
2518 // Find out about double-spaced-ness of the Opcode and pass it on to
2519 // DisassembleNLdSt0().
2520 static bool DisassembleNLdSt(MCInst &MI, unsigned Opcode, uint32_t insn,
2521 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2523 const StringRef Name = ARMInsts[Opcode].Name;
2524 bool DblSpaced = false;
2525 // 0 represents standard alignment, i.e., unaligned data access.
2526 unsigned alignment = 0;
2528 unsigned elem = 0; // legal values: {1, 2, 3, 4}
2529 if (Name.startswith("VST1") || Name.startswith("VLD1"))
2532 if (Name.startswith("VST2") || Name.startswith("VLD2"))
2535 if (Name.startswith("VST3") || Name.startswith("VLD3"))
2538 if (Name.startswith("VST4") || Name.startswith("VLD4"))
2541 if (Name.find("LN") != std::string::npos) {
2542 // To one lane instructions.
2543 // See, for example, 8.6.317 VLD4 (single 4-element structure to one lane).
2545 // Utility function takes number of elements, size, and index_align.
2546 if (!Align4OneLaneInst(elem,
2547 slice(insn, 11, 10),
2552 // <size> == 16 && Inst{5} == 1 --> DblSpaced = true
2553 if (Name.endswith("16") || Name.endswith("16_UPD"))
2554 DblSpaced = slice(insn, 5, 5) == 1;
2556 // <size> == 32 && Inst{6} == 1 --> DblSpaced = true
2557 if (Name.endswith("32") || Name.endswith("32_UPD"))
2558 DblSpaced = slice(insn, 6, 6) == 1;
2560 // Multiple n-element structures with type encoded as Inst{11-8}.
2561 // See, for example, A8.6.316 VLD4 (multiple 4-element structures).
2563 // Inst{5-4} encodes alignment.
2564 unsigned align = slice(insn, 5, 4);
2569 alignment = 64; break;
2571 alignment = 128; break;
2573 alignment = 256; break;
2576 unsigned type = slice(insn, 11, 8);
2577 // Reject UNDEFINED instructions based on type and align.
2578 // Plus set DblSpaced flag where appropriate.
2584 // A8.6.307 & A8.6.391
2585 if ((type == 7 && slice(align, 1, 1) == 1) ||
2586 (type == 10 && align == 3) ||
2587 (type == 6 && slice(align, 1, 1) == 1))
2591 // n == 2 && type == 0b1001 -> DblSpaced = true
2592 // A8.6.310 & A8.6.393
2593 if ((type == 8 || type == 9) && align == 3)
2595 DblSpaced = (type == 9);
2598 // n == 3 && type == 0b0101 -> DblSpaced = true
2599 // A8.6.313 & A8.6.395
2600 if (slice(insn, 7, 6) == 3 || slice(align, 1, 1) == 1)
2602 DblSpaced = (type == 5);
2605 // n == 4 && type == 0b0001 -> DblSpaced = true
2606 // A8.6.316 & A8.6.397
2607 if (slice(insn, 7, 6) == 3)
2609 DblSpaced = (type == 1);
2613 return DisassembleNLdSt0(MI, Opcode, insn, NumOps, NumOpsAdded,
2614 slice(insn, 21, 21) == 0, DblSpaced, alignment/8, B);
2621 // Qd/Dd imm src(=Qd/Dd)
2622 static bool DisassembleN1RegModImmFrm(MCInst &MI, unsigned Opcode,
2623 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2625 const TargetInstrDesc &TID = ARMInsts[Opcode];
2626 const TargetOperandInfo *OpInfo = TID.OpInfo;
2628 assert(NumOps >= 2 &&
2629 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2630 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2631 (OpInfo[1].RegClass < 0) &&
2632 "Expect 1 reg operand followed by 1 imm operand");
2634 // Qd/Dd = Inst{22:15-12} => NEON Rd
2635 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[0].RegClass,
2636 decodeNEONRd(insn))));
2638 ElemSize esize = ESizeNA;
2641 case ARM::VMOVv16i8:
2644 case ARM::VMOVv4i16:
2645 case ARM::VMOVv8i16:
2646 case ARM::VMVNv4i16:
2647 case ARM::VMVNv8i16:
2648 case ARM::VBICiv4i16:
2649 case ARM::VBICiv8i16:
2650 case ARM::VORRiv4i16:
2651 case ARM::VORRiv8i16:
2654 case ARM::VMOVv2i32:
2655 case ARM::VMOVv4i32:
2656 case ARM::VMVNv2i32:
2657 case ARM::VMVNv4i32:
2658 case ARM::VBICiv2i32:
2659 case ARM::VBICiv4i32:
2660 case ARM::VORRiv2i32:
2661 case ARM::VORRiv4i32:
2664 case ARM::VMOVv1i64:
2665 case ARM::VMOVv2i64:
2669 assert(0 && "Unexpected opcode!");
2673 // One register and a modified immediate value.
2674 // Add the imm operand.
2675 MI.addOperand(MCOperand::CreateImm(decodeN1VImm(insn, esize)));
2679 // VBIC/VORRiv*i* variants have an extra $src = $Vd to be filled in.
2681 (OpInfo[2].RegClass == ARM::DPRRegClassID ||
2682 OpInfo[2].RegClass == ARM::QPRRegClassID)) {
2683 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[0].RegClass,
2684 decodeNEONRd(insn))));
2695 N2V_VectorConvert_Between_Float_Fixed
2697 } // End of unnamed namespace
2699 // Vector Convert [between floating-point and fixed-point]
2700 // Qd/Dd Qm/Dm [fbits]
2702 // Vector Duplicate Lane (from scalar to all elements) Instructions.
2703 // VDUPLN16d, VDUPLN16q, VDUPLN32d, VDUPLN32q, VDUPLN8d, VDUPLN8q:
2706 // Vector Move Long:
2709 // Vector Move Narrow:
2713 static bool DisassembleNVdVmOptImm(MCInst &MI, unsigned Opc, uint32_t insn,
2714 unsigned short NumOps, unsigned &NumOpsAdded, N2VFlag Flag, BO B) {
2716 const TargetInstrDesc &TID = ARMInsts[Opc];
2717 const TargetOperandInfo *OpInfo = TID.OpInfo;
2719 assert(NumOps >= 2 &&
2720 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2721 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2722 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2723 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2724 "Expect >= 2 operands and first 2 as reg operands");
2726 unsigned &OpIdx = NumOpsAdded;
2730 ElemSize esize = ESizeNA;
2731 if (Flag == N2V_VectorDupLane) {
2732 // VDUPLN has its index embedded. Its size can be inferred from the Opcode.
2733 assert(Opc >= ARM::VDUPLN16d && Opc <= ARM::VDUPLN8q &&
2734 "Unexpected Opcode");
2735 esize = (Opc == ARM::VDUPLN8d || Opc == ARM::VDUPLN8q) ? ESize8
2736 : ((Opc == ARM::VDUPLN16d || Opc == ARM::VDUPLN16q) ? ESize16
2740 // Qd/Dd = Inst{22:15-12} => NEON Rd
2741 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2742 decodeNEONRd(insn))));
2746 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2748 MI.addOperand(MCOperand::CreateReg(0));
2752 // Dm = Inst{5:3-0} => NEON Rm
2753 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2754 decodeNEONRm(insn))));
2757 // VZIP and others have two TIED_TO reg operands.
2759 while (OpIdx < NumOps &&
2760 (Idx = TID.getOperandConstraint(OpIdx, TOI::TIED_TO)) != -1) {
2761 // Add TIED_TO operand.
2762 MI.addOperand(MI.getOperand(Idx));
2766 // Add the imm operand, if required.
2767 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2768 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2770 unsigned imm = 0xFFFFFFFF;
2772 if (Flag == N2V_VectorDupLane)
2773 imm = decodeNVLaneDupIndex(insn, esize);
2774 if (Flag == N2V_VectorConvert_Between_Float_Fixed)
2775 imm = decodeVCVTFractionBits(insn);
2777 assert(imm != 0xFFFFFFFF && "Internal error");
2778 MI.addOperand(MCOperand::CreateImm(imm));
2785 static bool DisassembleN2RegFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2786 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2788 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2791 static bool DisassembleNVCVTFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2792 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2794 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2795 N2V_VectorConvert_Between_Float_Fixed, B);
2797 static bool DisassembleNVecDupLnFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2798 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2800 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2801 N2V_VectorDupLane, B);
2804 // Vector Shift [Accumulate] Instructions.
2805 // Qd/Dd [Qd/Dd (TIED_TO)] Qm/Dm ShiftAmt
2807 // Vector Shift Left Long (with maximum shift count) Instructions.
2808 // VSHLLi16, VSHLLi32, VSHLLi8: Qd Dm imm (== size)
2810 static bool DisassembleNVectorShift(MCInst &MI, unsigned Opcode, uint32_t insn,
2811 unsigned short NumOps, unsigned &NumOpsAdded, bool LeftShift, BO B) {
2813 const TargetInstrDesc &TID = ARMInsts[Opcode];
2814 const TargetOperandInfo *OpInfo = TID.OpInfo;
2816 assert(NumOps >= 3 &&
2817 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2818 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2819 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2820 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2821 "Expect >= 3 operands and first 2 as reg operands");
2823 unsigned &OpIdx = NumOpsAdded;
2827 // Qd/Dd = Inst{22:15-12} => NEON Rd
2828 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2829 decodeNEONRd(insn))));
2832 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2834 MI.addOperand(MCOperand::CreateReg(0));
2838 assert((OpInfo[OpIdx].RegClass == ARM::DPRRegClassID ||
2839 OpInfo[OpIdx].RegClass == ARM::QPRRegClassID) &&
2840 "Reg operand expected");
2842 // Qm/Dm = Inst{5:3-0} => NEON Rm
2843 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2844 decodeNEONRm(insn))));
2847 assert(OpInfo[OpIdx].RegClass < 0 && "Imm operand expected");
2849 // Add the imm operand.
2851 // VSHLL has maximum shift count as the imm, inferred from its size.
2855 Imm = decodeNVSAmt(insn, LeftShift);
2867 MI.addOperand(MCOperand::CreateImm(Imm));
2873 // Left shift instructions.
2874 static bool DisassembleN2RegVecShLFrm(MCInst &MI, unsigned Opcode,
2875 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2877 return DisassembleNVectorShift(MI, Opcode, insn, NumOps, NumOpsAdded, true,
2880 // Right shift instructions have different shift amount interpretation.
2881 static bool DisassembleN2RegVecShRFrm(MCInst &MI, unsigned Opcode,
2882 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2884 return DisassembleNVectorShift(MI, Opcode, insn, NumOps, NumOpsAdded, false,
2893 N3V_Multiply_By_Scalar
2895 } // End of unnamed namespace
2897 // NEON Three Register Instructions with Optional Immediate Operand
2899 // Vector Extract Instructions.
2900 // Qd/Dd Qn/Dn Qm/Dm imm4
2902 // Vector Shift (Register) Instructions.
2903 // Qd/Dd Qm/Dm Qn/Dn (notice the order of m, n)
2905 // Vector Multiply [Accumulate/Subtract] [Long] By Scalar Instructions.
2906 // Qd/Dd Qn/Dn RestrictedDm index
2909 static bool DisassembleNVdVnVmOptImm(MCInst &MI, unsigned Opcode, uint32_t insn,
2910 unsigned short NumOps, unsigned &NumOpsAdded, N3VFlag Flag, BO B) {
2912 const TargetInstrDesc &TID = ARMInsts[Opcode];
2913 const TargetOperandInfo *OpInfo = TID.OpInfo;
2915 // No checking for OpInfo[2] because of MOVDneon/MOVQ with only two regs.
2916 assert(NumOps >= 3 &&
2917 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2918 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2919 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2920 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2921 "Expect >= 3 operands and first 2 as reg operands");
2923 unsigned &OpIdx = NumOpsAdded;
2927 bool VdVnVm = Flag == N3V_VectorShift ? false : true;
2928 bool IsImm4 = Flag == N3V_VectorExtract ? true : false;
2929 bool IsDmRestricted = Flag == N3V_Multiply_By_Scalar ? true : false;
2930 ElemSize esize = ESizeNA;
2931 if (Flag == N3V_Multiply_By_Scalar) {
2932 unsigned size = (insn >> 20) & 3;
2933 if (size == 1) esize = ESize16;
2934 if (size == 2) esize = ESize32;
2935 assert (esize == ESize16 || esize == ESize32);
2938 // Qd/Dd = Inst{22:15-12} => NEON Rd
2939 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2940 decodeNEONRd(insn))));
2943 // VABA, VABAL, VBSLd, VBSLq, ...
2944 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2946 MI.addOperand(MCOperand::CreateReg(0));
2950 // Dn = Inst{7:19-16} => NEON Rn
2952 // Dm = Inst{5:3-0} => NEON Rm
2953 MI.addOperand(MCOperand::CreateReg(
2954 getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2955 VdVnVm ? decodeNEONRn(insn)
2956 : decodeNEONRm(insn))));
2959 // Special case handling for VMOVDneon and VMOVQ because they are marked as
2961 if (Opcode == ARM::VMOVDneon || Opcode == ARM::VMOVQ)
2964 // Dm = Inst{5:3-0} => NEON Rm
2966 // Dm is restricted to D0-D7 if size is 16, D0-D15 otherwise
2968 // Dn = Inst{7:19-16} => NEON Rn
2969 unsigned m = VdVnVm ? (IsDmRestricted ? decodeRestrictedDm(insn, esize)
2970 : decodeNEONRm(insn))
2971 : decodeNEONRn(insn);
2973 MI.addOperand(MCOperand::CreateReg(
2974 getRegisterEnum(B, OpInfo[OpIdx].RegClass, m)));
2977 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2978 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2979 // Add the imm operand.
2982 Imm = decodeN3VImm(insn);
2983 else if (IsDmRestricted)
2984 Imm = decodeRestrictedDmIndex(insn, esize);
2986 assert(0 && "Internal error: unreachable code!");
2990 MI.addOperand(MCOperand::CreateImm(Imm));
2997 static bool DisassembleN3RegFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2998 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3000 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
3003 static bool DisassembleN3RegVecShFrm(MCInst &MI, unsigned Opcode,
3004 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3006 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
3007 N3V_VectorShift, B);
3009 static bool DisassembleNVecExtractFrm(MCInst &MI, unsigned Opcode,
3010 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3012 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
3013 N3V_VectorExtract, B);
3015 static bool DisassembleNVecMulScalarFrm(MCInst &MI, unsigned Opcode,
3016 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3018 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
3019 N3V_Multiply_By_Scalar, B);
3022 // Vector Table Lookup
3024 // VTBL1, VTBX1: Dd [Dd(TIED_TO)] Dn Dm
3025 // VTBL2, VTBX2: Dd [Dd(TIED_TO)] Dn Dn+1 Dm
3026 // VTBL3, VTBX3: Dd [Dd(TIED_TO)] Dn Dn+1 Dn+2 Dm
3027 // VTBL4, VTBX4: Dd [Dd(TIED_TO)] Dn Dn+1 Dn+2 Dn+3 Dm
3028 static bool DisassembleNVTBLFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3029 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3031 const TargetInstrDesc &TID = ARMInsts[Opcode];
3032 const TargetOperandInfo *OpInfo = TID.OpInfo;
3033 if (!OpInfo) return false;
3035 assert(NumOps >= 3 &&
3036 OpInfo[0].RegClass == ARM::DPRRegClassID &&
3037 OpInfo[1].RegClass == ARM::DPRRegClassID &&
3038 OpInfo[2].RegClass == ARM::DPRRegClassID &&
3039 "Expect >= 3 operands and first 3 as reg operands");
3041 unsigned &OpIdx = NumOpsAdded;
3045 unsigned Rn = decodeNEONRn(insn);
3047 // {Dn} encoded as len = 0b00
3048 // {Dn Dn+1} encoded as len = 0b01
3049 // {Dn Dn+1 Dn+2 } encoded as len = 0b10
3050 // {Dn Dn+1 Dn+2 Dn+3} encoded as len = 0b11
3051 unsigned Len = slice(insn, 9, 8) + 1;
3053 // Dd (the destination vector)
3054 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
3055 decodeNEONRd(insn))));
3058 // Process tied_to operand constraint.
3060 if ((Idx = TID.getOperandConstraint(OpIdx, TOI::TIED_TO)) != -1) {
3061 MI.addOperand(MI.getOperand(Idx));
3065 // Do the <list> now.
3066 for (unsigned i = 0; i < Len; ++i) {
3067 assert(OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::DPRRegClassID &&
3068 "Reg operand expected");
3069 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
3074 // Dm (the index vector)
3075 assert(OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::DPRRegClassID &&
3076 "Reg operand (index vector) expected");
3077 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
3078 decodeNEONRm(insn))));
3084 // Vector Get Lane (move scalar to ARM core register) Instructions.
3085 // VGETLNi32, VGETLNs16, VGETLNs8, VGETLNu16, VGETLNu8: Rt Dn index
3086 static bool DisassembleNGetLnFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3087 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3089 const TargetInstrDesc &TID = ARMInsts[Opcode];
3090 const TargetOperandInfo *OpInfo = TID.OpInfo;
3091 if (!OpInfo) return false;
3093 assert(TID.getNumDefs() == 1 && NumOps >= 3 &&
3094 OpInfo[0].RegClass == ARM::GPRRegClassID &&
3095 OpInfo[1].RegClass == ARM::DPRRegClassID &&
3096 OpInfo[2].RegClass < 0 &&
3097 "Expect >= 3 operands with one dst operand");
3100 Opcode == ARM::VGETLNi32 ? ESize32
3101 : ((Opcode == ARM::VGETLNs16 || Opcode == ARM::VGETLNu16) ? ESize16
3104 // Rt = Inst{15-12} => ARM Rd
3105 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3108 // Dn = Inst{7:19-16} => NEON Rn
3109 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
3110 decodeNEONRn(insn))));
3112 MI.addOperand(MCOperand::CreateImm(decodeNVLaneOpIndex(insn, esize)));
3118 // Vector Set Lane (move ARM core register to scalar) Instructions.
3119 // VSETLNi16, VSETLNi32, VSETLNi8: Dd Dd (TIED_TO) Rt index
3120 static bool DisassembleNSetLnFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3121 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3123 const TargetInstrDesc &TID = ARMInsts[Opcode];
3124 const TargetOperandInfo *OpInfo = TID.OpInfo;
3125 if (!OpInfo) return false;
3127 assert(TID.getNumDefs() == 1 && NumOps >= 3 &&
3128 OpInfo[0].RegClass == ARM::DPRRegClassID &&
3129 OpInfo[1].RegClass == ARM::DPRRegClassID &&
3130 TID.getOperandConstraint(1, TOI::TIED_TO) != -1 &&
3131 OpInfo[2].RegClass == ARM::GPRRegClassID &&
3132 OpInfo[3].RegClass < 0 &&
3133 "Expect >= 3 operands with one dst operand");
3136 Opcode == ARM::VSETLNi8 ? ESize8
3137 : (Opcode == ARM::VSETLNi16 ? ESize16
3140 // Dd = Inst{7:19-16} => NEON Rn
3141 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
3142 decodeNEONRn(insn))));
3145 MI.addOperand(MCOperand::CreateReg(0));
3147 // Rt = Inst{15-12} => ARM Rd
3148 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3151 MI.addOperand(MCOperand::CreateImm(decodeNVLaneOpIndex(insn, esize)));
3157 // Vector Duplicate Instructions (from ARM core register to all elements).
3158 // VDUP8d, VDUP16d, VDUP32d, VDUP8q, VDUP16q, VDUP32q: Qd/Dd Rt
3159 static bool DisassembleNDupFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3160 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3162 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3164 assert(NumOps >= 2 &&
3165 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
3166 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
3167 OpInfo[1].RegClass == ARM::GPRRegClassID &&
3168 "Expect >= 2 operands and first 2 as reg operand");
3170 unsigned RegClass = OpInfo[0].RegClass;
3172 // Qd/Dd = Inst{7:19-16} => NEON Rn
3173 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClass,
3174 decodeNEONRn(insn))));
3176 // Rt = Inst{15-12} => ARM Rd
3177 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3187 static inline bool MemBarrierInstr(uint32_t insn) {
3188 unsigned op7_4 = slice(insn, 7, 4);
3189 if (slice(insn, 31, 8) == 0xf57ff0 && (op7_4 >= 4 && op7_4 <= 6))
3195 static inline bool PreLoadOpcode(unsigned Opcode) {
3197 case ARM::PLDi12: case ARM::PLDrs:
3198 case ARM::PLDWi12: case ARM::PLDWrs:
3199 case ARM::PLIi12: case ARM::PLIrs:
3206 static bool DisassemblePreLoadFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3207 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3209 // Preload Data/Instruction requires either 2 or 3 operands.
3210 // PLDi12, PLDWi12, PLIi12: addrmode_imm12
3211 // PLDrs, PLDWrs, PLIrs: ldst_so_reg
3213 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3216 if (Opcode == ARM::PLDi12 || Opcode == ARM::PLDWi12
3217 || Opcode == ARM::PLIi12) {
3218 unsigned Imm12 = slice(insn, 11, 0);
3219 bool Negative = getUBit(insn) == 0;
3221 // A8.6.118 PLD (literal) PLDWi12 with Rn=PC is transformed to PLDi12.
3222 if (Opcode == ARM::PLDWi12 && slice(insn, 19, 16) == 0xF) {
3223 DEBUG(errs() << "Rn == '1111': PLDWi12 morphed to PLDi12\n");
3224 MI.setOpcode(ARM::PLDi12);
3227 // -0 is represented specially. All other values are as normal.
3228 int Offset = Negative ? -1 * Imm12 : Imm12;
3229 if (Imm12 == 0 && Negative)
3232 MI.addOperand(MCOperand::CreateImm(Offset));
3235 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3238 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
3240 // Inst{6-5} encodes the shift opcode.
3241 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
3242 // Inst{11-7} encodes the imm5 shift amount.
3243 unsigned ShImm = slice(insn, 11, 7);
3245 // A8.4.1. Possible rrx or shift amount of 32...
3246 getImmShiftSE(ShOp, ShImm);
3247 MI.addOperand(MCOperand::CreateImm(
3248 ARM_AM::getAM2Opc(AddrOpcode, ShImm, ShOp)));
3255 static bool DisassembleMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3256 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3258 if (MemBarrierInstr(insn)) {
3259 // DMBsy, DSBsy, and ISBsy instructions have zero operand and are taken care
3260 // of within the generic ARMBasicMCBuilder::BuildIt() method.
3262 // Inst{3-0} encodes the memory barrier option for the variants.
3263 MI.addOperand(MCOperand::CreateImm(slice(insn, 3, 0)));
3279 // SWP, SWPB: Rd Rm Rn
3280 // Delegate to DisassembleLdStExFrm()....
3281 return DisassembleLdStExFrm(MI, Opcode, insn, NumOps, NumOpsAdded, B);
3286 if (Opcode == ARM::SETEND) {
3288 MI.addOperand(MCOperand::CreateImm(slice(insn, 9, 9)));
3292 // FIXME: To enable correct asm parsing and disasm of CPS we need 3 different
3293 // opcodes which match the same real instruction. This is needed since there's
3294 // no current handling of optional arguments. Fix here when a better handling
3295 // of optional arguments is implemented.
3296 if (Opcode == ARM::CPS3p) { // M = 1
3297 // Let's reject these impossible imod values by returning false:
3300 // AsmPrinter cannot handle imod=0b00, plus (imod=0b00,M=1,iflags!=0) is an
3301 // invalid combination, so we just check for imod=0b00 here.
3302 if (slice(insn, 19, 18) == 0 || slice(insn, 19, 18) == 1)
3304 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 18))); // imod
3305 MI.addOperand(MCOperand::CreateImm(slice(insn, 8, 6))); // iflags
3306 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0))); // mode
3310 if (Opcode == ARM::CPS2p) { // mode = 0, M = 0
3311 // Let's reject these impossible imod values by returning false:
3312 // 1. (imod=0b00,M=0)
3314 if (slice(insn, 19, 18) == 0 || slice(insn, 19, 18) == 1)
3316 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 18))); // imod
3317 MI.addOperand(MCOperand::CreateImm(slice(insn, 8, 6))); // iflags
3321 if (Opcode == ARM::CPS1p) { // imod = 0, iflags = 0, M = 1
3322 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0))); // mode
3327 // DBG has its option specified in Inst{3-0}.
3328 if (Opcode == ARM::DBG) {
3329 MI.addOperand(MCOperand::CreateImm(slice(insn, 3, 0)));
3334 // BKPT takes an imm32 val equal to ZeroExtend(Inst{19-8:3-0}).
3335 if (Opcode == ARM::BKPT) {
3336 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 8) << 4 |
3337 slice(insn, 3, 0)));
3342 if (PreLoadOpcode(Opcode))
3343 return DisassemblePreLoadFrm(MI, Opcode, insn, NumOps, NumOpsAdded, B);
3345 assert(0 && "Unexpected misc instruction!");
3349 /// FuncPtrs - FuncPtrs maps ARMFormat to its corresponding DisassembleFP.
3350 /// We divide the disassembly task into different categories, with each one
3351 /// corresponding to a specific instruction encoding format. There could be
3352 /// exceptions when handling a specific format, and that is why the Opcode is
3353 /// also present in the function prototype.
3354 static const DisassembleFP FuncPtrs[] = {
3358 &DisassembleBrMiscFrm,
3360 &DisassembleDPSoRegFrm,
3363 &DisassembleLdMiscFrm,
3364 &DisassembleStMiscFrm,
3365 &DisassembleLdStMulFrm,
3366 &DisassembleLdStExFrm,
3367 &DisassembleArithMiscFrm,
3370 &DisassembleVFPUnaryFrm,
3371 &DisassembleVFPBinaryFrm,
3372 &DisassembleVFPConv1Frm,
3373 &DisassembleVFPConv2Frm,
3374 &DisassembleVFPConv3Frm,
3375 &DisassembleVFPConv4Frm,
3376 &DisassembleVFPConv5Frm,
3377 &DisassembleVFPLdStFrm,
3378 &DisassembleVFPLdStMulFrm,
3379 &DisassembleVFPMiscFrm,
3380 &DisassembleThumbFrm,
3381 &DisassembleMiscFrm,
3382 &DisassembleNGetLnFrm,
3383 &DisassembleNSetLnFrm,
3384 &DisassembleNDupFrm,
3386 // VLD and VST (including one lane) Instructions.
3389 // A7.4.6 One register and a modified immediate value
3390 // 1-Register Instructions with imm.
3391 // LLVM only defines VMOVv instructions.
3392 &DisassembleN1RegModImmFrm,
3394 // 2-Register Instructions with no imm.
3395 &DisassembleN2RegFrm,
3397 // 2-Register Instructions with imm (vector convert float/fixed point).
3398 &DisassembleNVCVTFrm,
3400 // 2-Register Instructions with imm (vector dup lane).
3401 &DisassembleNVecDupLnFrm,
3403 // Vector Shift Left Instructions.
3404 &DisassembleN2RegVecShLFrm,
3406 // Vector Shift Righ Instructions, which has different interpretation of the
3407 // shift amount from the imm6 field.
3408 &DisassembleN2RegVecShRFrm,
3410 // 3-Register Data-Processing Instructions.
3411 &DisassembleN3RegFrm,
3413 // Vector Shift (Register) Instructions.
3414 // D:Vd M:Vm N:Vn (notice that M:Vm is the first operand)
3415 &DisassembleN3RegVecShFrm,
3417 // Vector Extract Instructions.
3418 &DisassembleNVecExtractFrm,
3420 // Vector [Saturating Rounding Doubling] Multiply [Accumulate/Subtract] [Long]
3421 // By Scalar Instructions.
3422 &DisassembleNVecMulScalarFrm,
3424 // Vector Table Lookup uses byte indexes in a control vector to look up byte
3425 // values in a table and generate a new vector.
3426 &DisassembleNVTBLFrm,
3431 /// BuildIt - BuildIt performs the build step for this ARM Basic MC Builder.
3432 /// The general idea is to set the Opcode for the MCInst, followed by adding
3433 /// the appropriate MCOperands to the MCInst. ARM Basic MC Builder delegates
3434 /// to the Format-specific disassemble function for disassembly, followed by
3435 /// TryPredicateAndSBitModifier() to do PredicateOperand and OptionalDefOperand
3436 /// which follow the Dst/Src Operands.
3437 bool ARMBasicMCBuilder::BuildIt(MCInst &MI, uint32_t insn) {
3438 // Stage 1 sets the Opcode.
3439 MI.setOpcode(Opcode);
3440 // If the number of operands is zero, we're done!
3444 // Stage 2 calls the format-specific disassemble function to build the operand
3448 unsigned NumOpsAdded = 0;
3449 bool OK = (*Disasm)(MI, Opcode, insn, NumOps, NumOpsAdded, this);
3451 if (!OK || this->Err != 0) return false;
3452 if (NumOpsAdded >= NumOps)
3455 // Stage 3 deals with operands unaccounted for after stage 2 is finished.
3456 // FIXME: Should this be done selectively?
3457 return TryPredicateAndSBitModifier(MI, Opcode, insn, NumOps - NumOpsAdded);
3460 // A8.3 Conditional execution
3461 // A8.3.1 Pseudocode details of conditional execution
3462 // Condition bits '111x' indicate the instruction is always executed.
3463 static uint32_t CondCode(uint32_t CondField) {
3464 if (CondField == 0xF)
3469 /// DoPredicateOperands - DoPredicateOperands process the predicate operands
3470 /// of some Thumb instructions which come before the reglist operands. It
3471 /// returns true if the two predicate operands have been processed.
3472 bool ARMBasicMCBuilder::DoPredicateOperands(MCInst& MI, unsigned Opcode,
3473 uint32_t /* insn */, unsigned short NumOpsRemaining) {
3475 assert(NumOpsRemaining > 0 && "Invalid argument");
3477 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3478 unsigned Idx = MI.getNumOperands();
3480 // First, we check whether this instr specifies the PredicateOperand through
3481 // a pair of TargetOperandInfos with isPredicate() property.
3482 if (NumOpsRemaining >= 2 &&
3483 OpInfo[Idx].isPredicate() && OpInfo[Idx+1].isPredicate() &&
3484 OpInfo[Idx].RegClass < 0 &&
3485 OpInfo[Idx+1].RegClass == ARM::CCRRegClassID)
3487 // If we are inside an IT block, get the IT condition bits maintained via
3488 // ARMBasicMCBuilder::ITState[7:0], through ARMBasicMCBuilder::GetITCond().
3491 MI.addOperand(MCOperand::CreateImm(GetITCond()));
3493 MI.addOperand(MCOperand::CreateImm(ARMCC::AL));
3494 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
3501 /// TryPredicateAndSBitModifier - TryPredicateAndSBitModifier tries to process
3502 /// the possible Predicate and SBitModifier, to build the remaining MCOperand
3504 bool ARMBasicMCBuilder::TryPredicateAndSBitModifier(MCInst& MI, unsigned Opcode,
3505 uint32_t insn, unsigned short NumOpsRemaining) {
3507 assert(NumOpsRemaining > 0 && "Invalid argument");
3509 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3510 const std::string &Name = ARMInsts[Opcode].Name;
3511 unsigned Idx = MI.getNumOperands();
3512 uint64_t TSFlags = ARMInsts[Opcode].TSFlags;
3514 // First, we check whether this instr specifies the PredicateOperand through
3515 // a pair of TargetOperandInfos with isPredicate() property.
3516 if (NumOpsRemaining >= 2 &&
3517 OpInfo[Idx].isPredicate() && OpInfo[Idx+1].isPredicate() &&
3518 OpInfo[Idx].RegClass < 0 &&
3519 OpInfo[Idx+1].RegClass == ARM::CCRRegClassID)
3521 // If we are inside an IT block, get the IT condition bits maintained via
3522 // ARMBasicMCBuilder::ITState[7:0], through ARMBasicMCBuilder::GetITCond().
3525 MI.addOperand(MCOperand::CreateImm(GetITCond()));
3527 if (Name.length() > 1 && Name[0] == 't') {
3528 // Thumb conditional branch instructions have their cond field embedded,
3532 if (Name == "t2Bcc")
3533 MI.addOperand(MCOperand::CreateImm(CondCode(slice(insn, 25, 22))));
3534 else if (Name == "tBcc")
3535 MI.addOperand(MCOperand::CreateImm(CondCode(slice(insn, 11, 8))));
3537 MI.addOperand(MCOperand::CreateImm(ARMCC::AL));
3539 // ARM instructions get their condition field from Inst{31-28}.
3540 // We should reject Inst{31-28} = 0b1111 as invalid encoding.
3541 if (!isNEONDomain(TSFlags) && getCondField(insn) == 0xF)
3543 MI.addOperand(MCOperand::CreateImm(CondCode(getCondField(insn))));
3546 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
3548 NumOpsRemaining -= 2;
3551 if (NumOpsRemaining == 0)
3554 // Next, if OptionalDefOperand exists, we check whether the 'S' bit is set.
3555 if (OpInfo[Idx].isOptionalDef() && OpInfo[Idx].RegClass==ARM::CCRRegClassID) {
3556 MI.addOperand(MCOperand::CreateReg(getSBit(insn) == 1 ? ARM::CPSR : 0));
3560 if (NumOpsRemaining == 0)
3566 /// RunBuildAfterHook - RunBuildAfterHook performs operations deemed necessary
3567 /// after BuildIt is finished.
3568 bool ARMBasicMCBuilder::RunBuildAfterHook(bool Status, MCInst &MI,
3571 if (!SP) return Status;
3573 if (Opcode == ARM::t2IT)
3574 Status = SP->InitIT(slice(insn, 7, 0)) ? Status : false;
3575 else if (InITBlock())
3581 /// Opcode, Format, and NumOperands make up an ARM Basic MCBuilder.
3582 ARMBasicMCBuilder::ARMBasicMCBuilder(unsigned opc, ARMFormat format,
3584 : Opcode(opc), Format(format), NumOps(num), SP(0), Err(0) {
3585 unsigned Idx = (unsigned)format;
3586 assert(Idx < (array_lengthof(FuncPtrs) - 1) && "Unknown format");
3587 Disasm = FuncPtrs[Idx];
3590 /// CreateMCBuilder - Return an ARMBasicMCBuilder that can build up the MC
3591 /// infrastructure of an MCInst given the Opcode and Format of the instr.
3592 /// Return NULL if it fails to create/return a proper builder. API clients
3593 /// are responsible for freeing up of the allocated memory. Cacheing can be
3594 /// performed by the API clients to improve performance.
3595 ARMBasicMCBuilder *llvm::CreateMCBuilder(unsigned Opcode, ARMFormat Format) {
3596 // For "Unknown format", fail by returning a NULL pointer.
3597 if ((unsigned)Format >= (array_lengthof(FuncPtrs) - 1)) {
3598 DEBUG(errs() << "Unknown format\n");
3602 return new ARMBasicMCBuilder(Opcode, Format,
3603 ARMInsts[Opcode].getNumOperands());