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 "MCTargetDesc/ARMAddressingModes.h"
20 #include "MCTargetDesc/ARMMCExpr.h"
21 #include "llvm/ADT/APInt.h"
22 #include "llvm/ADT/APFloat.h"
23 #include "llvm/Support/Debug.h"
24 #include "llvm/Support/raw_ostream.h"
26 //#define DEBUG(X) do { X; } while (0)
28 /// ARMGenInstrInfo.inc - ARMGenInstrInfo.inc contains the static const
29 /// MCInstrDesc ARMInsts[] definition and the MCOperandInfo[]'s describing the
30 /// operand info for each ARMInsts[i].
32 /// Together with an instruction's encoding format, we can take advantage of the
33 /// NumOperands and the OpInfo fields of the target instruction description in
34 /// the quest to build out the MCOperand list for an MCInst.
36 /// The general guideline is that with a known format, the number of dst and src
37 /// operands are well-known. The dst is built first, followed by the src
38 /// operand(s). The operands not yet used at this point are for the Implicit
39 /// Uses and Defs by this instr. For the Uses part, the pred:$p operand is
40 /// defined with two components:
42 /// def pred { // Operand PredicateOperand
43 /// ValueType Type = OtherVT;
44 /// string PrintMethod = "printPredicateOperand";
45 /// string AsmOperandLowerMethod = ?;
46 /// dag MIOperandInfo = (ops i32imm, CCR);
47 /// AsmOperandClass ParserMatchClass = ImmAsmOperand;
48 /// dag DefaultOps = (ops (i32 14), (i32 zero_reg));
51 /// which is manifested by the MCOperandInfo[] of:
53 /// { 0, 0|(1<<MCOI::Predicate), 0 },
54 /// { ARM::CCRRegClassID, 0|(1<<MCOI::Predicate), 0 }
56 /// So the first predicate MCOperand corresponds to the immediate part of the
57 /// ARM condition field (Inst{31-28}), and the second predicate MCOperand
58 /// corresponds to a register kind of ARM::CPSR.
60 /// For the Defs part, in the simple case of only cc_out:$s, we have:
62 /// def cc_out { // Operand OptionalDefOperand
63 /// ValueType Type = OtherVT;
64 /// string PrintMethod = "printSBitModifierOperand";
65 /// string AsmOperandLowerMethod = ?;
66 /// dag MIOperandInfo = (ops CCR);
67 /// AsmOperandClass ParserMatchClass = ImmAsmOperand;
68 /// dag DefaultOps = (ops (i32 zero_reg));
71 /// which is manifested by the one MCOperandInfo of:
73 /// { ARM::CCRRegClassID, 0|(1<<MCOI::OptionalDef), 0 }
77 extern MCInstrDesc ARMInsts[];
82 const char *ARMUtils::OpcodeName(unsigned Opcode) {
83 return ARMInsts[Opcode].Name;
86 // Return the register enum Based on RegClass and the raw register number.
89 getRegisterEnum(BO B, unsigned RegClassID, unsigned RawRegister) {
90 if (RegClassID == ARM::rGPRRegClassID) {
91 // Check for The register numbers 13 and 15 that are not permitted for many
92 // Thumb register specifiers.
93 if (RawRegister == 13 || RawRegister == 15) {
97 // For this purpose, we can treat rGPR as if it were GPR.
98 RegClassID = ARM::GPRRegClassID;
101 // See also decodeNEONRd(), decodeNEONRn(), decodeNEONRm().
102 // A7.3 register encoding
103 // Qd -> bit[12] == 0
104 // Qn -> bit[16] == 0
107 // If one of these bits is 1, the instruction is UNDEFINED.
108 if (RegClassID == ARM::QPRRegClassID && slice(RawRegister, 0, 0) == 1) {
113 RegClassID == ARM::QPRRegClassID ? RawRegister >> 1 : RawRegister;
119 switch (RegClassID) {
120 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R0;
121 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
122 case ARM::DPR_VFP2RegClassID:
124 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
125 case ARM::QPR_VFP2RegClassID:
127 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S0;
131 switch (RegClassID) {
132 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R1;
133 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
134 case ARM::DPR_VFP2RegClassID:
136 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
137 case ARM::QPR_VFP2RegClassID:
139 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S1;
143 switch (RegClassID) {
144 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R2;
145 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
146 case ARM::DPR_VFP2RegClassID:
148 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
149 case ARM::QPR_VFP2RegClassID:
151 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S2;
155 switch (RegClassID) {
156 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R3;
157 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
158 case ARM::DPR_VFP2RegClassID:
160 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
161 case ARM::QPR_VFP2RegClassID:
163 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S3;
167 switch (RegClassID) {
168 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R4;
169 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
170 case ARM::DPR_VFP2RegClassID:
172 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q4;
173 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S4;
177 switch (RegClassID) {
178 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R5;
179 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
180 case ARM::DPR_VFP2RegClassID:
182 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q5;
183 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S5;
187 switch (RegClassID) {
188 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R6;
189 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
190 case ARM::DPR_VFP2RegClassID:
192 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q6;
193 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S6;
197 switch (RegClassID) {
198 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R7;
199 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
200 case ARM::DPR_VFP2RegClassID:
202 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q7;
203 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S7;
207 switch (RegClassID) {
208 case ARM::GPRRegClassID: return ARM::R8;
209 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D8;
210 case ARM::QPRRegClassID: return ARM::Q8;
211 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S8;
215 switch (RegClassID) {
216 case ARM::GPRRegClassID: return ARM::R9;
217 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D9;
218 case ARM::QPRRegClassID: return ARM::Q9;
219 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S9;
223 switch (RegClassID) {
224 case ARM::GPRRegClassID: return ARM::R10;
225 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D10;
226 case ARM::QPRRegClassID: return ARM::Q10;
227 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S10;
231 switch (RegClassID) {
232 case ARM::GPRRegClassID: return ARM::R11;
233 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D11;
234 case ARM::QPRRegClassID: return ARM::Q11;
235 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S11;
239 switch (RegClassID) {
240 case ARM::GPRRegClassID: return ARM::R12;
241 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D12;
242 case ARM::QPRRegClassID: return ARM::Q12;
243 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S12;
247 switch (RegClassID) {
248 case ARM::GPRRegClassID: return ARM::SP;
249 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D13;
250 case ARM::QPRRegClassID: return ARM::Q13;
251 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S13;
255 switch (RegClassID) {
256 case ARM::GPRRegClassID: return ARM::LR;
257 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D14;
258 case ARM::QPRRegClassID: return ARM::Q14;
259 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S14;
263 switch (RegClassID) {
264 case ARM::GPRRegClassID: return ARM::PC;
265 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D15;
266 case ARM::QPRRegClassID: return ARM::Q15;
267 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S15;
271 switch (RegClassID) {
272 case ARM::DPRRegClassID: return ARM::D16;
273 case ARM::SPRRegClassID: return ARM::S16;
277 switch (RegClassID) {
278 case ARM::DPRRegClassID: return ARM::D17;
279 case ARM::SPRRegClassID: return ARM::S17;
283 switch (RegClassID) {
284 case ARM::DPRRegClassID: return ARM::D18;
285 case ARM::SPRRegClassID: return ARM::S18;
289 switch (RegClassID) {
290 case ARM::DPRRegClassID: return ARM::D19;
291 case ARM::SPRRegClassID: return ARM::S19;
295 switch (RegClassID) {
296 case ARM::DPRRegClassID: return ARM::D20;
297 case ARM::SPRRegClassID: return ARM::S20;
301 switch (RegClassID) {
302 case ARM::DPRRegClassID: return ARM::D21;
303 case ARM::SPRRegClassID: return ARM::S21;
307 switch (RegClassID) {
308 case ARM::DPRRegClassID: return ARM::D22;
309 case ARM::SPRRegClassID: return ARM::S22;
313 switch (RegClassID) {
314 case ARM::DPRRegClassID: return ARM::D23;
315 case ARM::SPRRegClassID: return ARM::S23;
319 switch (RegClassID) {
320 case ARM::DPRRegClassID: return ARM::D24;
321 case ARM::SPRRegClassID: return ARM::S24;
325 switch (RegClassID) {
326 case ARM::DPRRegClassID: return ARM::D25;
327 case ARM::SPRRegClassID: return ARM::S25;
331 switch (RegClassID) {
332 case ARM::DPRRegClassID: return ARM::D26;
333 case ARM::SPRRegClassID: return ARM::S26;
337 switch (RegClassID) {
338 case ARM::DPRRegClassID: return ARM::D27;
339 case ARM::SPRRegClassID: return ARM::S27;
343 switch (RegClassID) {
344 case ARM::DPRRegClassID: return ARM::D28;
345 case ARM::SPRRegClassID: return ARM::S28;
349 switch (RegClassID) {
350 case ARM::DPRRegClassID: return ARM::D29;
351 case ARM::SPRRegClassID: return ARM::S29;
355 switch (RegClassID) {
356 case ARM::DPRRegClassID: return ARM::D30;
357 case ARM::SPRRegClassID: return ARM::S30;
361 switch (RegClassID) {
362 case ARM::DPRRegClassID: return ARM::D31;
363 case ARM::SPRRegClassID: return ARM::S31;
367 DEBUG(errs() << "Invalid (RegClassID, RawRegister) combination\n");
368 // Encoding error. Mark the builder with error code != 0.
373 ///////////////////////////////
375 // Utility Functions //
377 ///////////////////////////////
379 // Extract/Decode Rd: Inst{15-12}.
380 static inline unsigned decodeRd(uint32_t insn) {
381 return (insn >> ARMII::RegRdShift) & ARMII::GPRRegMask;
384 // Extract/Decode Rn: Inst{19-16}.
385 static inline unsigned decodeRn(uint32_t insn) {
386 return (insn >> ARMII::RegRnShift) & ARMII::GPRRegMask;
389 // Extract/Decode Rm: Inst{3-0}.
390 static inline unsigned decodeRm(uint32_t insn) {
391 return (insn & ARMII::GPRRegMask);
394 // Extract/Decode Rs: Inst{11-8}.
395 static inline unsigned decodeRs(uint32_t insn) {
396 return (insn >> ARMII::RegRsShift) & ARMII::GPRRegMask;
399 static inline unsigned getCondField(uint32_t insn) {
400 return (insn >> ARMII::CondShift);
403 static inline unsigned getIBit(uint32_t insn) {
404 return (insn >> ARMII::I_BitShift) & 1;
407 static inline unsigned getAM3IBit(uint32_t insn) {
408 return (insn >> ARMII::AM3_I_BitShift) & 1;
411 static inline unsigned getPBit(uint32_t insn) {
412 return (insn >> ARMII::P_BitShift) & 1;
415 static inline unsigned getUBit(uint32_t insn) {
416 return (insn >> ARMII::U_BitShift) & 1;
419 static inline unsigned getPUBits(uint32_t insn) {
420 return (insn >> ARMII::U_BitShift) & 3;
423 static inline unsigned getSBit(uint32_t insn) {
424 return (insn >> ARMII::S_BitShift) & 1;
427 static inline unsigned getWBit(uint32_t insn) {
428 return (insn >> ARMII::W_BitShift) & 1;
431 static inline unsigned getDBit(uint32_t insn) {
432 return (insn >> ARMII::D_BitShift) & 1;
435 static inline unsigned getNBit(uint32_t insn) {
436 return (insn >> ARMII::N_BitShift) & 1;
439 static inline unsigned getMBit(uint32_t insn) {
440 return (insn >> ARMII::M_BitShift) & 1;
443 // See A8.4 Shifts applied to a register.
444 // A8.4.2 Register controlled shifts.
446 // getShiftOpcForBits - getShiftOpcForBits translates from the ARM encoding bits
447 // into llvm enums for shift opcode. The API clients should pass in the value
448 // encoded with two bits, so the assert stays to signal a wrong API usage.
450 // A8-12: DecodeRegShift()
451 static inline ARM_AM::ShiftOpc getShiftOpcForBits(unsigned bits) {
453 default: assert(0 && "No such value"); return ARM_AM::no_shift;
454 case 0: return ARM_AM::lsl;
455 case 1: return ARM_AM::lsr;
456 case 2: return ARM_AM::asr;
457 case 3: return ARM_AM::ror;
461 // See A8.4 Shifts applied to a register.
462 // A8.4.1 Constant shifts.
464 // getImmShiftSE - getImmShiftSE translates from the raw ShiftOpc and raw Imm5
465 // encodings into the intended ShiftOpc and shift amount.
467 // A8-11: DecodeImmShift()
468 static inline void getImmShiftSE(ARM_AM::ShiftOpc &ShOp, unsigned &ShImm) {
472 case ARM_AM::no_shift:
476 ShOp = ARM_AM::no_shift;
488 // getAMSubModeForBits - getAMSubModeForBits translates from the ARM encoding
489 // bits Inst{24-23} (P(24) and U(23)) into llvm enums for AMSubMode. The API
490 // clients should pass in the value encoded with two bits, so the assert stays
491 // to signal a wrong API usage.
492 static inline ARM_AM::AMSubMode getAMSubModeForBits(unsigned bits) {
494 default: assert(0 && "No such value"); return ARM_AM::bad_am_submode;
495 case 1: return ARM_AM::ia; // P=0 U=1
496 case 3: return ARM_AM::ib; // P=1 U=1
497 case 0: return ARM_AM::da; // P=0 U=0
498 case 2: return ARM_AM::db; // P=1 U=0
502 ////////////////////////////////////////////
504 // Disassemble function definitions //
506 ////////////////////////////////////////////
508 /// There is a separate Disassemble*Frm function entry for disassembly of an ARM
509 /// instr into a list of MCOperands in the appropriate order, with possible dst,
510 /// followed by possible src(s).
512 /// The processing of the predicate, and the 'S' modifier bit, if MI modifies
513 /// the CPSR, is factored into ARMBasicMCBuilder's method named
514 /// TryPredicateAndSBitModifier.
516 static bool DisassemblePseudo(MCInst &MI, unsigned Opcode, uint32_t insn,
517 unsigned short NumOps, unsigned &NumOpsAdded, BO) {
519 assert(0 && "Unexpected pseudo instruction!");
524 // if d == 15 || n == 15 || m == 15 || a == 15 then UNPREDICTABLE;
527 // if d == 15 || n == 15 || m == 15 then UNPREDICTABLE;
530 // if dLo == 15 || dHi == 15 || n == 15 || m == 15 then UNPREDICTABLE;
531 // if dHi == dLo then UNPREDICTABLE;
532 static bool BadRegsMulFrm(unsigned Opcode, uint32_t insn) {
533 unsigned R19_16 = slice(insn, 19, 16);
534 unsigned R15_12 = slice(insn, 15, 12);
535 unsigned R11_8 = slice(insn, 11, 8);
536 unsigned R3_0 = slice(insn, 3, 0);
539 // Did we miss an opcode?
540 DEBUG(errs() << "BadRegsMulFrm: unexpected opcode!");
542 case ARM::MLA: case ARM::MLS: case ARM::SMLABB: case ARM::SMLABT:
543 case ARM::SMLATB: case ARM::SMLATT: case ARM::SMLAWB: case ARM::SMLAWT:
544 case ARM::SMMLA: case ARM::SMMLAR: case ARM::SMMLS: case ARM::SMMLSR:
546 if (R19_16 == 15 || R15_12 == 15 || R11_8 == 15 || R3_0 == 15)
549 case ARM::MUL: case ARM::SMMUL: case ARM::SMMULR:
550 case ARM::SMULBB: case ARM::SMULBT: case ARM::SMULTB: case ARM::SMULTT:
551 case ARM::SMULWB: case ARM::SMULWT: case ARM::SMUAD: case ARM::SMUADX:
552 // A8.6.167 SMLAD & A8.6.172 SMLSD
553 case ARM::SMLAD: case ARM::SMLADX: case ARM::SMLSD: case ARM::SMLSDX:
555 if (R19_16 == 15 || R11_8 == 15 || R3_0 == 15)
558 case ARM::SMLAL: case ARM::SMULL: case ARM::UMAAL: case ARM::UMLAL:
560 case ARM::SMLALBB: case ARM::SMLALBT: case ARM::SMLALTB: case ARM::SMLALTT:
561 case ARM::SMLALD: case ARM::SMLALDX: case ARM::SMLSLD: case ARM::SMLSLDX:
562 if (R19_16 == 15 || R15_12 == 15 || R11_8 == 15 || R3_0 == 15)
564 if (R19_16 == R15_12)
570 // Multiply Instructions.
571 // MLA, MLS, SMLABB, SMLABT, SMLATB, SMLATT, SMLAWB, SMLAWT, SMMLA, SMMLAR,
572 // SMMLS, SMMLAR, SMLAD, SMLADX, SMLSD, SMLSDX, and USADA8 (for convenience):
573 // Rd{19-16} Rn{3-0} Rm{11-8} Ra{15-12}
574 // But note that register checking for {SMLAD, SMLADX, SMLSD, SMLSDX} is
575 // only for {d, n, m}.
577 // MUL, SMMUL, SMMULR, SMULBB, SMULBT, SMULTB, SMULTT, SMULWB, SMULWT, SMUAD,
578 // SMUADX, and USAD8 (for convenience):
579 // Rd{19-16} Rn{3-0} Rm{11-8}
581 // SMLAL, SMULL, UMAAL, UMLAL, UMULL, SMLALBB, SMLALBT, SMLALTB, SMLALTT,
582 // SMLALD, SMLADLX, SMLSLD, SMLSLDX:
583 // RdLo{15-12} RdHi{19-16} Rn{3-0} Rm{11-8}
585 // The mapping of the multiply registers to the "regular" ARM registers, where
586 // there are convenience decoder functions, is:
592 static bool DisassembleMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
593 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
595 const MCInstrDesc &MCID = ARMInsts[Opcode];
596 unsigned short NumDefs = MCID.getNumDefs();
597 const MCOperandInfo *OpInfo = MCID.OpInfo;
598 unsigned &OpIdx = NumOpsAdded;
602 assert(NumDefs > 0 && "NumDefs should be greater than 0 for MulFrm");
604 && OpInfo[0].RegClass == ARM::GPRRegClassID
605 && OpInfo[1].RegClass == ARM::GPRRegClassID
606 && OpInfo[2].RegClass == ARM::GPRRegClassID
607 && "Expect three register operands");
609 // Sanity check for the register encodings.
610 if (BadRegsMulFrm(Opcode, insn))
613 // Instructions with two destination registers have RdLo{15-12} first.
615 assert(NumOps >= 4 && OpInfo[3].RegClass == ARM::GPRRegClassID &&
616 "Expect 4th register operand");
617 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
622 // The destination register: RdHi{19-16} or Rd{19-16}.
623 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
626 // The two src regsiters: Rn{3-0}, then Rm{11-8}.
627 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
629 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
633 // Many multiply instructions (e.g., MLA) have three src registers.
634 // The third register operand is Ra{15-12}.
635 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) {
636 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
644 // Helper routines for disassembly of coprocessor instructions.
646 static bool LdStCopOpcode(unsigned Opcode) {
647 if ((Opcode >= ARM::LDC2L_OFFSET && Opcode <= ARM::LDC_PRE) ||
648 (Opcode >= ARM::STC2L_OFFSET && Opcode <= ARM::STC_PRE))
652 static bool CoprocessorOpcode(unsigned Opcode) {
653 if (LdStCopOpcode(Opcode))
659 case ARM::CDP: case ARM::CDP2:
660 case ARM::MCR: case ARM::MCR2: case ARM::MRC: case ARM::MRC2:
661 case ARM::MCRR: case ARM::MCRR2: case ARM::MRRC: case ARM::MRRC2:
665 static inline unsigned GetCoprocessor(uint32_t insn) {
666 return slice(insn, 11, 8);
668 static inline unsigned GetCopOpc1(uint32_t insn, bool CDP) {
669 return CDP ? slice(insn, 23, 20) : slice(insn, 23, 21);
671 static inline unsigned GetCopOpc2(uint32_t insn) {
672 return slice(insn, 7, 5);
674 static inline unsigned GetCopOpc(uint32_t insn) {
675 return slice(insn, 7, 4);
677 // Most of the operands are in immediate forms, except Rd and Rn, which are ARM
680 // CDP, CDP2: cop opc1 CRd CRn CRm opc2
682 // MCR, MCR2, MRC, MRC2: cop opc1 Rd CRn CRm opc2
684 // MCRR, MCRR2, MRRC, MRRc2: cop opc Rd Rn CRm
686 // LDC_OFFSET, LDC_PRE, LDC_POST: cop CRd Rn R0 [+/-]imm8:00
688 // STC_OFFSET, STC_PRE, STC_POST: cop CRd Rn R0 [+/-]imm8:00
692 // LDC_OPTION: cop CRd Rn imm8
694 // STC_OPTION: cop CRd Rn imm8
697 static bool DisassembleCoprocessor(MCInst &MI, unsigned Opcode, uint32_t insn,
698 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
700 assert(NumOps >= 4 && "Num of operands >= 4 for coprocessor instr");
702 unsigned &OpIdx = NumOpsAdded;
704 // if coproc == '101x' then SEE "Advanced SIMD and VFP"
705 // But since the special instructions have more explicit encoding bits
706 // specified, if coproc == 10 or 11, we should reject it as invalid.
707 unsigned coproc = GetCoprocessor(insn);
708 if ((Opcode == ARM::MCR || Opcode == ARM::MCRR ||
709 Opcode == ARM::MRC || Opcode == ARM::MRRC) &&
710 (coproc == 10 || coproc == 11)) {
711 DEBUG(errs() << "Encoding error: coproc == 10 or 11 for MCR[R]/MR[R]C\n");
715 bool OneCopOpc = (Opcode == ARM::MCRR || Opcode == ARM::MCRR2 ||
716 Opcode == ARM::MRRC || Opcode == ARM::MRRC2);
718 // CDP/CDP2 has no GPR operand; the opc1 operand is also wider (Inst{23-20}).
719 bool NoGPR = (Opcode == ARM::CDP || Opcode == ARM::CDP2);
720 bool LdStCop = LdStCopOpcode(Opcode);
721 bool RtOut = (Opcode == ARM::MRC || Opcode == ARM::MRC2);
726 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
730 MI.addOperand(MCOperand::CreateImm(coproc));
734 // Unindex if P:W = 0b00 --> _OPTION variant
735 unsigned PW = getPBit(insn) << 1 | getWBit(insn);
737 MI.addOperand(MCOperand::CreateImm(decodeRd(insn)));
739 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
744 MI.addOperand(MCOperand::CreateReg(0));
745 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
746 const MCInstrDesc &MCID = ARMInsts[Opcode];
748 (MCID.TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift;
749 unsigned Offset = ARM_AM::getAM2Opc(AddrOpcode, slice(insn, 7, 0) << 2,
750 ARM_AM::no_shift, IndexMode);
751 MI.addOperand(MCOperand::CreateImm(Offset));
754 MI.addOperand(MCOperand::CreateImm(slice(insn, 7, 0)));
758 MI.addOperand(MCOperand::CreateImm(OneCopOpc ? GetCopOpc(insn)
759 : GetCopOpc1(insn, NoGPR)));
763 MI.addOperand(NoGPR ? MCOperand::CreateImm(decodeRd(insn))
764 : MCOperand::CreateReg(
765 getRegisterEnum(B, ARM::GPRRegClassID,
770 MI.addOperand(OneCopOpc ? MCOperand::CreateReg(
771 getRegisterEnum(B, ARM::GPRRegClassID,
773 : MCOperand::CreateImm(decodeRn(insn)));
775 MI.addOperand(MCOperand::CreateImm(decodeRm(insn)));
780 MI.addOperand(MCOperand::CreateImm(GetCopOpc2(insn)));
788 // Branch Instructions.
789 // BL: SignExtend(Imm24:'00', 32)
790 // Bcc, BL_pred: SignExtend(Imm24:'00', 32) Pred0 Pred1
791 // SMC: ZeroExtend(imm4, 32)
792 // SVC: ZeroExtend(Imm24, 32)
794 // Various coprocessor instructions are assigned BrFrm arbitrarily.
795 // Delegates to DisassembleCoprocessor() helper function.
798 // MSR/MSRsys: Rm mask=Inst{19-16}
800 // MSRi/MSRsysi: so_imm
801 // SRSW/SRS: ldstm_mode:$amode mode_imm
802 // RFEW/RFE: ldstm_mode:$amode Rn
803 static bool DisassembleBrFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
804 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
806 if (CoprocessorOpcode(Opcode))
807 return DisassembleCoprocessor(MI, Opcode, insn, NumOps, NumOpsAdded, B);
809 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
810 if (!OpInfo) return false;
812 // MRS and MRSsys take one GPR reg Rd.
813 if (Opcode == ARM::MRS || Opcode == ARM::MRSsys) {
814 assert(NumOps >= 1 && OpInfo[0].RegClass == ARM::GPRRegClassID &&
815 "Reg operand expected");
816 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
821 // BXJ takes one GPR reg Rm.
822 if (Opcode == ARM::BXJ) {
823 assert(NumOps >= 1 && OpInfo[0].RegClass == ARM::GPRRegClassID &&
824 "Reg operand expected");
825 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
830 // MSR take a mask, followed by one GPR reg Rm. The mask contains the R Bit in
831 // bit 4, and the special register fields in bits 3-0.
832 if (Opcode == ARM::MSR) {
833 assert(NumOps >= 1 && OpInfo[1].RegClass == ARM::GPRRegClassID &&
834 "Reg operand expected");
835 MI.addOperand(MCOperand::CreateImm(slice(insn, 22, 22) << 4 /* R Bit */ |
836 slice(insn, 19, 16) /* Special Reg */ ));
837 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
842 // MSRi take a mask, followed by one so_imm operand. The mask contains the
843 // R Bit in bit 4, and the special register fields in bits 3-0.
844 if (Opcode == ARM::MSRi) {
845 // A5.2.11 MSR (immediate), and hints & B6.1.6 MSR (immediate)
846 // The hints instructions have more specific encodings, so if mask == 0,
847 // we should reject this as an invalid instruction.
848 if (slice(insn, 19, 16) == 0)
850 MI.addOperand(MCOperand::CreateImm(slice(insn, 22, 22) << 4 /* R Bit */ |
851 slice(insn, 19, 16) /* Special Reg */ ));
852 // SOImm is 4-bit rotate amount in bits 11-8 with 8-bit imm in bits 7-0.
853 // A5.2.4 Rotate amount is twice the numeric value of Inst{11-8}.
854 // See also ARMAddressingModes.h: getSOImmValImm() and getSOImmValRot().
855 unsigned Rot = (insn >> ARMII::SoRotImmShift) & 0xF;
856 unsigned Imm = insn & 0xFF;
857 MI.addOperand(MCOperand::CreateImm(ARM_AM::rotr32(Imm, 2*Rot)));
861 if (Opcode == ARM::SRSW || Opcode == ARM::SRS ||
862 Opcode == ARM::RFEW || Opcode == ARM::RFE) {
863 ARM_AM::AMSubMode SubMode = getAMSubModeForBits(getPUBits(insn));
864 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM4ModeImm(SubMode)));
866 if (Opcode == ARM::SRSW || Opcode == ARM::SRS)
867 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0)));
869 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
875 assert((Opcode == ARM::Bcc || Opcode == ARM::BL || Opcode == ARM::BL_pred
876 || Opcode == ARM::SMC || Opcode == ARM::SVC) &&
877 "Unexpected Opcode");
879 assert(NumOps >= 1 && OpInfo[0].RegClass < 0 && "Imm operand expected");
882 if (Opcode == ARM::SMC) {
883 // ZeroExtend(imm4, 32) where imm24 = Inst{3-0}.
884 Imm32 = slice(insn, 3, 0);
885 } else if (Opcode == ARM::SVC) {
886 // ZeroExtend(imm24, 32) where imm24 = Inst{23-0}.
887 Imm32 = slice(insn, 23, 0);
889 // SignExtend(imm24:'00', 32) where imm24 = Inst{23-0}.
890 unsigned Imm26 = slice(insn, 23, 0) << 2;
891 //Imm32 = signextend<signed int, 26>(Imm26);
892 Imm32 = SignExtend32<26>(Imm26);
895 MI.addOperand(MCOperand::CreateImm(Imm32));
901 // Misc. Branch Instructions.
903 // BLX, BLX_pred, BX, BX_pred
905 static bool DisassembleBrMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
906 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
908 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
909 if (!OpInfo) return false;
911 unsigned &OpIdx = NumOpsAdded;
915 // BX_RET and MOVPCLR have only two predicate operands; do an early return.
916 if (Opcode == ARM::BX_RET || Opcode == ARM::MOVPCLR)
919 // BLX and BX take one GPR reg.
920 if (Opcode == ARM::BLX || Opcode == ARM::BLX_pred ||
921 Opcode == ARM::BX || Opcode == ARM::BX_pred) {
922 assert(NumOps >= 1 && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
923 "Reg operand expected");
924 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
930 // BLXi takes imm32 (the PC offset).
931 if (Opcode == ARM::BLXi) {
932 assert(NumOps >= 1 && OpInfo[0].RegClass < 0 && "Imm operand expected");
933 // SignExtend(imm24:H:'0', 32) where imm24 = Inst{23-0} and H = Inst{24}.
934 unsigned Imm26 = slice(insn, 23, 0) << 2 | slice(insn, 24, 24) << 1;
935 int Imm32 = SignExtend32<26>(Imm26);
936 MI.addOperand(MCOperand::CreateImm(Imm32));
944 static inline bool getBFCInvMask(uint32_t insn, uint32_t &mask) {
945 uint32_t lsb = slice(insn, 11, 7);
946 uint32_t msb = slice(insn, 20, 16);
949 DEBUG(errs() << "Encoding error: msb < lsb\n");
953 for (uint32_t i = lsb; i <= msb; ++i)
959 // Standard data-processing instructions allow PC as a register specifier,
960 // but we should reject other DPFrm instructions with PC as registers.
961 static bool BadRegsDPFrm(unsigned Opcode, uint32_t insn) {
964 // Did we miss an opcode?
965 if (decodeRd(insn) == 15 || decodeRn(insn) == 15 || decodeRm(insn) == 15) {
966 DEBUG(errs() << "DPFrm with bad reg specifier(s)\n");
969 case ARM::ADCrr: case ARM::ADDSrr: case ARM::ADDrr: case ARM::ANDrr:
970 case ARM::BICrr: case ARM::CMNzrr: case ARM::CMPrr: case ARM::EORrr:
971 case ARM::ORRrr: case ARM::RSBrr: case ARM::RSCrr: case ARM::SBCrr:
972 case ARM::SUBSrr: case ARM::SUBrr: case ARM::TEQrr: case ARM::TSTrr:
977 // A major complication is the fact that some of the saturating add/subtract
978 // operations have Rd Rm Rn, instead of the "normal" Rd Rn Rm.
979 // They are QADD, QDADD, QDSUB, and QSUB.
980 static bool DisassembleDPFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
981 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
983 const MCInstrDesc &MCID = ARMInsts[Opcode];
984 unsigned short NumDefs = MCID.getNumDefs();
985 bool isUnary = isUnaryDP(MCID.TSFlags);
986 const MCOperandInfo *OpInfo = MCID.OpInfo;
987 unsigned &OpIdx = NumOpsAdded;
991 // Disassemble register def if there is one.
992 if (NumDefs && (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID)) {
993 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
998 // Now disassemble the src operands.
1002 // Special-case handling of BFC/BFI/SBFX/UBFX.
1003 if (Opcode == ARM::BFC || Opcode == ARM::BFI) {
1004 // A8.6.17 BFC & A8.6.18 BFI
1006 if (decodeRd(insn) == 15)
1008 MI.addOperand(MCOperand::CreateReg(0));
1009 if (Opcode == ARM::BFI) {
1010 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1015 if (!getBFCInvMask(insn, mask))
1018 MI.addOperand(MCOperand::CreateImm(mask));
1022 if (Opcode == ARM::SBFX || Opcode == ARM::UBFX) {
1023 // Sanity check Rd and Rm.
1024 if (decodeRd(insn) == 15 || decodeRm(insn) == 15)
1026 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1028 MI.addOperand(MCOperand::CreateImm(slice(insn, 11, 7)));
1029 MI.addOperand(MCOperand::CreateImm(slice(insn, 20, 16) + 1));
1034 bool RmRn = (Opcode == ARM::QADD || Opcode == ARM::QDADD ||
1035 Opcode == ARM::QDSUB || Opcode == ARM::QSUB);
1037 // BinaryDP has an Rn operand.
1039 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1040 "Reg operand expected");
1041 MI.addOperand(MCOperand::CreateReg(
1042 getRegisterEnum(B, ARM::GPRRegClassID,
1043 RmRn ? decodeRm(insn) : decodeRn(insn))));
1047 // If this is a two-address operand, skip it, e.g., MOVCCr operand 1.
1048 if (isUnary && (MCID.getOperandConstraint(OpIdx, MCOI::TIED_TO) != -1)) {
1049 MI.addOperand(MCOperand::CreateReg(0));
1053 // Now disassemble operand 2.
1054 if (OpIdx >= NumOps)
1057 if (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) {
1058 // We have a reg/reg form.
1059 // Assert disabled because saturating operations, e.g., A8.6.127 QASX, are
1060 // routed here as well.
1061 // assert(getIBit(insn) == 0 && "I_Bit != '0' reg/reg form");
1062 if (BadRegsDPFrm(Opcode, insn))
1064 MI.addOperand(MCOperand::CreateReg(
1065 getRegisterEnum(B, ARM::GPRRegClassID,
1066 RmRn? decodeRn(insn) : decodeRm(insn))));
1068 } else if (Opcode == ARM::MOVi16 || Opcode == ARM::MOVTi16) {
1069 // These two instructions don't allow d as 15.
1070 if (decodeRd(insn) == 15)
1072 // We have an imm16 = imm4:imm12 (imm4=Inst{19:16}, imm12 = Inst{11:0}).
1073 assert(getIBit(insn) == 1 && "I_Bit != '1' reg/imm form");
1074 unsigned Imm16 = slice(insn, 19, 16) << 12 | slice(insn, 11, 0);
1075 if (!B->tryAddingSymbolicOperand(Imm16, 4, MI))
1076 MI.addOperand(MCOperand::CreateImm(Imm16));
1079 // We have a reg/imm form.
1080 // SOImm is 4-bit rotate amount in bits 11-8 with 8-bit imm in bits 7-0.
1081 // A5.2.4 Rotate amount is twice the numeric value of Inst{11-8}.
1082 // See also ARMAddressingModes.h: getSOImmValImm() and getSOImmValRot().
1083 assert(getIBit(insn) == 1 && "I_Bit != '1' reg/imm form");
1084 unsigned Rot = (insn >> ARMII::SoRotImmShift) & 0xF;
1085 unsigned Imm = insn & 0xFF;
1086 MI.addOperand(MCOperand::CreateImm(ARM_AM::rotr32(Imm, 2*Rot)));
1093 static bool DisassembleDPSoRegRegFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1094 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1096 const MCInstrDesc &MCID = ARMInsts[Opcode];
1097 unsigned short NumDefs = MCID.getNumDefs();
1098 bool isUnary = isUnaryDP(MCID.TSFlags);
1099 const MCOperandInfo *OpInfo = MCID.OpInfo;
1100 unsigned &OpIdx = NumOpsAdded;
1104 // Disassemble register def if there is one.
1105 if (NumDefs && (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID)) {
1106 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1111 // Disassemble the src operands.
1112 if (OpIdx >= NumOps)
1115 // BinaryDP has an Rn operand.
1117 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1118 "Reg operand expected");
1119 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1124 // If this is a two-address operand, skip it, e.g., MOVCCs operand 1.
1125 if (isUnary && (MCID.getOperandConstraint(OpIdx, MCOI::TIED_TO) != -1)) {
1126 MI.addOperand(MCOperand::CreateReg(0));
1130 // Disassemble operand 2, which consists of three components.
1131 if (OpIdx + 2 >= NumOps)
1134 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
1135 (OpInfo[OpIdx+1].RegClass == ARM::GPRRegClassID) &&
1136 (OpInfo[OpIdx+2].RegClass < 0) &&
1137 "Expect 3 reg operands");
1139 // Register-controlled shifts have Inst{7} = 0 and Inst{4} = 1.
1140 unsigned Rs = slice(insn, 4, 4);
1142 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1145 // If Inst{7} != 0, we should reject this insn as an invalid encoding.
1146 if (slice(insn, 7, 7))
1149 // A8.6.3 ADC (register-shifted register)
1150 // if d == 15 || n == 15 || m == 15 || s == 15 then UNPREDICTABLE;
1152 // This also accounts for shift instructions (register) where, fortunately,
1153 // Inst{19-16} = 0b0000.
1154 // A8.6.89 LSL (register)
1155 // if d == 15 || n == 15 || m == 15 then UNPREDICTABLE;
1156 if (decodeRd(insn) == 15 || decodeRn(insn) == 15 ||
1157 decodeRm(insn) == 15 || decodeRs(insn) == 15)
1160 // Register-controlled shifts: [Rm, Rs, shift].
1161 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1163 // Inst{6-5} encodes the shift opcode.
1164 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1165 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(ShOp, 0)));
1167 // Constant shifts: [Rm, reg0, shift_imm].
1168 MI.addOperand(MCOperand::CreateReg(0)); // NoRegister
1169 // Inst{6-5} encodes the shift opcode.
1170 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1171 // Inst{11-7} encodes the imm5 shift amount.
1172 unsigned ShImm = slice(insn, 11, 7);
1174 // A8.4.1. Possible rrx or shift amount of 32...
1175 getImmShiftSE(ShOp, ShImm);
1176 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(ShOp, ShImm)));
1183 static bool DisassembleDPSoRegImmFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1184 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1186 const MCInstrDesc &MCID = ARMInsts[Opcode];
1187 unsigned short NumDefs = MCID.getNumDefs();
1188 bool isUnary = isUnaryDP(MCID.TSFlags);
1189 const MCOperandInfo *OpInfo = MCID.OpInfo;
1190 unsigned &OpIdx = NumOpsAdded;
1194 // Disassemble register def if there is one.
1195 if (NumDefs && (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID)) {
1196 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1201 // Disassemble the src operands.
1202 if (OpIdx >= NumOps)
1205 // BinaryDP has an Rn operand.
1207 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1208 "Reg operand expected");
1209 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1214 // If this is a two-address operand, skip it, e.g., MOVCCs operand 1.
1215 if (isUnary && (MCID.getOperandConstraint(OpIdx, MCOI::TIED_TO) != -1)) {
1216 MI.addOperand(MCOperand::CreateReg(0));
1220 // Disassemble operand 2, which consists of two components.
1221 if (OpIdx + 1 >= NumOps)
1224 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
1225 (OpInfo[OpIdx+1].RegClass < 0) &&
1226 "Expect 2 reg operands");
1228 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1231 // Inst{6-5} encodes the shift opcode.
1232 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1233 // Inst{11-7} encodes the imm5 shift amount.
1234 unsigned ShImm = slice(insn, 11, 7);
1236 // A8.4.1. Possible rrx or shift amount of 32...
1237 getImmShiftSE(ShOp, ShImm);
1238 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(ShOp, ShImm)));
1246 static bool BadRegsLdStFrm(unsigned Opcode, uint32_t insn, bool Store, bool WBack,
1248 const StringRef Name = ARMInsts[Opcode].Name;
1249 unsigned Rt = decodeRd(insn);
1250 unsigned Rn = decodeRn(insn);
1251 unsigned Rm = decodeRm(insn);
1252 unsigned P = getPBit(insn);
1253 unsigned W = getWBit(insn);
1256 // Only STR (immediate, register) allows PC as the source.
1257 if (Name.startswith("STRB") && Rt == 15) {
1258 DEBUG(errs() << "if t == 15 then UNPREDICTABLE\n");
1261 if (WBack && (Rn == 15 || Rn == Rt)) {
1262 DEBUG(errs() << "if wback && (n == 15 || n == t) then UNPREDICTABLE\n");
1265 if (!Imm && Rm == 15) {
1266 DEBUG(errs() << "if m == 15 then UNPREDICTABLE\n");
1270 // Only LDR (immediate, register) allows PC as the destination.
1271 if (Name.startswith("LDRB") && Rt == 15) {
1272 DEBUG(errs() << "if t == 15 then UNPREDICTABLE\n");
1278 // The literal form must be in offset mode; it's an encoding error
1280 if (!(P == 1 && W == 0)) {
1281 DEBUG(errs() << "Ld literal form with !(P == 1 && W == 0)\n");
1284 // LDRB (literal) does not allow PC as the destination.
1285 if (Opcode != ARM::LDRi12 && Rt == 15) {
1286 DEBUG(errs() << "if t == 15 then UNPREDICTABLE\n");
1290 // Write back while Rn == Rt does not make sense.
1291 if (WBack && (Rn == Rt)) {
1292 DEBUG(errs() << "if wback && n == t then UNPREDICTABLE\n");
1299 DEBUG(errs() << "if m == 15 then UNPREDICTABLE\n");
1302 if (WBack && (Rn == 15 || Rn == Rt)) {
1303 DEBUG(errs() << "if wback && (n == 15 || n == t) then UNPREDICTABLE\n");
1311 static bool DisassembleLdStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1312 unsigned short NumOps, unsigned &NumOpsAdded, bool isStore, BO B) {
1314 const MCInstrDesc &MCID = ARMInsts[Opcode];
1315 bool isPrePost = isPrePostLdSt(MCID.TSFlags);
1316 const MCOperandInfo *OpInfo = MCID.OpInfo;
1317 if (!OpInfo) return false;
1319 unsigned &OpIdx = NumOpsAdded;
1323 assert(((!isStore && MCID.getNumDefs() > 0) ||
1324 (isStore && (MCID.getNumDefs() == 0 || isPrePost)))
1325 && "Invalid arguments");
1327 // Operand 0 of a pre- and post-indexed store is the address base writeback.
1328 if (isPrePost && isStore) {
1329 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1330 "Reg operand expected");
1331 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1336 // Disassemble the dst/src operand.
1337 if (OpIdx >= NumOps)
1340 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1341 "Reg operand expected");
1342 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1346 // After dst of a pre- and post-indexed load is the address base writeback.
1347 if (isPrePost && !isStore) {
1348 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1349 "Reg operand expected");
1350 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1355 // Disassemble the base operand.
1356 if (OpIdx >= NumOps)
1359 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1360 "Reg operand expected");
1361 assert((!isPrePost || (MCID.getOperandConstraint(OpIdx, MCOI::TIED_TO) != -1))
1362 && "Index mode or tied_to operand expected");
1363 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1367 // For reg/reg form, base reg is followed by +/- reg shop imm.
1368 // For immediate form, it is followed by +/- imm12.
1369 // See also ARMAddressingModes.h (Addressing Mode #2).
1370 if (OpIdx + 1 >= NumOps)
1373 if (BadRegsLdStFrm(Opcode, insn, isStore, isPrePost, getIBit(insn)==0))
1376 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1377 unsigned IndexMode =
1378 (MCID.TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift;
1379 if (getIBit(insn) == 0) {
1380 // For pre- and post-indexed case, add a reg0 operand (Addressing Mode #2).
1381 // Otherwise, skip the reg operand since for addrmode_imm12, Rn has already
1384 MI.addOperand(MCOperand::CreateReg(0));
1388 unsigned Imm12 = slice(insn, 11, 0);
1389 if (Opcode == ARM::LDRBi12 || Opcode == ARM::LDRi12 ||
1390 Opcode == ARM::STRBi12 || Opcode == ARM::STRi12) {
1391 // Disassemble the 12-bit immediate offset, which is the second operand in
1392 // $addrmode_imm12 => (ops GPR:$base, i32imm:$offsimm).
1393 int Offset = AddrOpcode == ARM_AM::add ? 1 * Imm12 : -1 * Imm12;
1394 MI.addOperand(MCOperand::CreateImm(Offset));
1396 // Disassemble the 12-bit immediate offset, which is the second operand in
1397 // $am2offset => (ops GPR, i32imm).
1398 unsigned Offset = ARM_AM::getAM2Opc(AddrOpcode, Imm12, ARM_AM::no_shift,
1400 MI.addOperand(MCOperand::CreateImm(Offset));
1404 // If Inst{25} = 1 and Inst{4} != 0, we should reject this as invalid.
1405 if (slice(insn,4,4) == 1)
1408 // Disassemble the offset reg (Rm), shift type, and immediate shift length.
1409 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1411 // Inst{6-5} encodes the shift opcode.
1412 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1413 // Inst{11-7} encodes the imm5 shift amount.
1414 unsigned ShImm = slice(insn, 11, 7);
1416 // A8.4.1. Possible rrx or shift amount of 32...
1417 getImmShiftSE(ShOp, ShImm);
1418 MI.addOperand(MCOperand::CreateImm(
1419 ARM_AM::getAM2Opc(AddrOpcode, ShImm, ShOp, IndexMode)));
1426 static bool DisassembleLdFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1427 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1428 return DisassembleLdStFrm(MI, Opcode, insn, NumOps, NumOpsAdded, false, B);
1431 static bool DisassembleStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1432 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1433 return DisassembleLdStFrm(MI, Opcode, insn, NumOps, NumOpsAdded, true, B);
1436 static bool HasDualReg(unsigned Opcode) {
1440 case ARM::LDRD: case ARM::LDRD_PRE: case ARM::LDRD_POST:
1441 case ARM::STRD: case ARM::STRD_PRE: case ARM::STRD_POST:
1446 static bool DisassembleLdStMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1447 unsigned short NumOps, unsigned &NumOpsAdded, bool isStore, BO B) {
1449 const MCInstrDesc &MCID = ARMInsts[Opcode];
1450 bool isPrePost = isPrePostLdSt(MCID.TSFlags);
1451 const MCOperandInfo *OpInfo = MCID.OpInfo;
1452 if (!OpInfo) return false;
1454 unsigned &OpIdx = NumOpsAdded;
1458 assert(((!isStore && MCID.getNumDefs() > 0) ||
1459 (isStore && (MCID.getNumDefs() == 0 || isPrePost)))
1460 && "Invalid arguments");
1462 // Operand 0 of a pre- and post-indexed store is the address base writeback.
1463 if (isPrePost && isStore) {
1464 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1465 "Reg operand expected");
1466 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1471 // Disassemble the dst/src operand.
1472 if (OpIdx >= NumOps)
1475 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1476 "Reg operand expected");
1477 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1481 // Fill in LDRD and STRD's second operand Rt operand.
1482 if (HasDualReg(Opcode)) {
1483 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1484 decodeRd(insn) + 1)));
1488 // After dst of a pre- and post-indexed load is the address base writeback.
1489 if (isPrePost && !isStore) {
1490 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1491 "Reg operand expected");
1492 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1497 // Disassemble the base operand.
1498 if (OpIdx >= NumOps)
1501 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1502 "Reg operand expected");
1503 assert((!isPrePost || (MCID.getOperandConstraint(OpIdx, MCOI::TIED_TO) != -1))
1504 && "Offset mode or tied_to operand expected");
1505 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1509 // For reg/reg form, base reg is followed by +/- reg.
1510 // For immediate form, it is followed by +/- imm8.
1511 // See also ARMAddressingModes.h (Addressing Mode #3).
1512 if (OpIdx + 1 >= NumOps)
1515 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
1516 (OpInfo[OpIdx+1].RegClass < 0) &&
1517 "Expect 1 reg operand followed by 1 imm operand");
1519 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1520 unsigned IndexMode =
1521 (MCID.TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift;
1522 if (getAM3IBit(insn) == 1) {
1523 MI.addOperand(MCOperand::CreateReg(0));
1525 // Disassemble the 8-bit immediate offset.
1526 unsigned Imm4H = (insn >> ARMII::ImmHiShift) & 0xF;
1527 unsigned Imm4L = insn & 0xF;
1528 unsigned Offset = ARM_AM::getAM3Opc(AddrOpcode, (Imm4H << 4) | Imm4L,
1530 MI.addOperand(MCOperand::CreateImm(Offset));
1532 // Disassemble the offset reg (Rm).
1533 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1535 unsigned Offset = ARM_AM::getAM3Opc(AddrOpcode, 0, IndexMode);
1536 MI.addOperand(MCOperand::CreateImm(Offset));
1543 static bool DisassembleLdMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1544 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1545 return DisassembleLdStMiscFrm(MI, Opcode, insn, NumOps, NumOpsAdded, false,
1549 static bool DisassembleStMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1550 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1551 return DisassembleLdStMiscFrm(MI, Opcode, insn, NumOps, NumOpsAdded, true, B);
1554 // The algorithm for disassembly of LdStMulFrm is different from others because
1555 // it explicitly populates the two predicate operands after the base register.
1556 // After that, we need to populate the reglist with each affected register
1557 // encoded as an MCOperand.
1558 static bool DisassembleLdStMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1559 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1561 assert(NumOps >= 4 && "LdStMulFrm expects NumOps >= 4");
1564 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1566 // Writeback to base, if necessary.
1567 if (Opcode == ARM::LDMIA_UPD || Opcode == ARM::STMIA_UPD ||
1568 Opcode == ARM::LDMDA_UPD || Opcode == ARM::STMDA_UPD ||
1569 Opcode == ARM::LDMDB_UPD || Opcode == ARM::STMDB_UPD ||
1570 Opcode == ARM::LDMIB_UPD || Opcode == ARM::STMIB_UPD) {
1571 MI.addOperand(MCOperand::CreateReg(Base));
1575 // Add the base register operand.
1576 MI.addOperand(MCOperand::CreateReg(Base));
1578 // Handling the two predicate operands before the reglist.
1579 int64_t CondVal = getCondField(insn);
1582 MI.addOperand(MCOperand::CreateImm(CondVal));
1583 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
1587 // Fill the variadic part of reglist.
1588 unsigned RegListBits = insn & ((1 << 16) - 1);
1589 for (unsigned i = 0; i < 16; ++i) {
1590 if ((RegListBits >> i) & 1) {
1591 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1600 // LDREX, LDREXB, LDREXH: Rd Rn
1601 // LDREXD: Rd Rd+1 Rn
1602 // STREX, STREXB, STREXH: Rd Rm Rn
1603 // STREXD: Rd Rm Rm+1 Rn
1605 // SWP, SWPB: Rd Rm Rn
1606 static bool DisassembleLdStExFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1607 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1609 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1610 if (!OpInfo) return false;
1612 unsigned &OpIdx = NumOpsAdded;
1617 && OpInfo[0].RegClass == ARM::GPRRegClassID
1618 && OpInfo[1].RegClass == ARM::GPRRegClassID
1619 && "Expect 2 reg operands");
1621 bool isStore = slice(insn, 20, 20) == 0;
1622 bool isDW = (Opcode == ARM::LDREXD || Opcode == ARM::STREXD);
1624 // Add the destination operand.
1625 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1629 // Store register Exclusive needs a source operand.
1631 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1636 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1637 decodeRm(insn)+1)));
1641 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1642 decodeRd(insn)+1)));
1646 // Finally add the pointer operand.
1647 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1654 // Misc. Arithmetic Instructions.
1656 // PKHBT, PKHTB: Rd Rn Rm , LSL/ASR #imm5
1657 // RBIT, REV, REV16, REVSH: Rd Rm
1658 static bool DisassembleArithMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1659 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1661 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1662 unsigned &OpIdx = NumOpsAdded;
1667 && OpInfo[0].RegClass == ARM::GPRRegClassID
1668 && OpInfo[1].RegClass == ARM::GPRRegClassID
1669 && "Expect 2 reg operands");
1671 bool ThreeReg = NumOps > 2 && OpInfo[2].RegClass == ARM::GPRRegClassID;
1673 // Sanity check the registers, which should not be 15.
1674 if (decodeRd(insn) == 15 || decodeRm(insn) == 15)
1676 if (ThreeReg && decodeRn(insn) == 15)
1679 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1684 assert(NumOps >= 4 && "Expect >= 4 operands");
1685 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1690 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1694 // If there is still an operand info left which is an immediate operand, add
1695 // an additional imm5 LSL/ASR operand.
1696 if (ThreeReg && OpInfo[OpIdx].RegClass < 0
1697 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1698 // Extract the 5-bit immediate field Inst{11-7}.
1699 unsigned ShiftAmt = (insn >> ARMII::ShiftShift) & 0x1F;
1700 if (Opcode == ARM::PKHBT || Opcode == ARM::PKHTB)
1701 MI.addOperand(MCOperand::CreateImm(ShiftAmt));
1703 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(ARM_AM::no_shift,
1711 /// DisassembleSatFrm - Disassemble saturate instructions:
1712 /// SSAT, SSAT16, USAT, and USAT16.
1713 static bool DisassembleSatFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1714 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1717 // if d == 15 || n == 15 then UNPREDICTABLE;
1718 if (decodeRd(insn) == 15 || decodeRm(insn) == 15)
1721 const MCInstrDesc &MCID = ARMInsts[Opcode];
1722 NumOpsAdded = MCID.getNumOperands() - 2; // ignore predicate operands
1724 // Disassemble register def.
1725 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1728 unsigned Pos = slice(insn, 20, 16);
1729 MI.addOperand(MCOperand::CreateImm(Pos));
1731 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1734 if (NumOpsAdded == 4) {
1735 ARM_AM::ShiftOpc Opc = (slice(insn, 6, 6) != 0 ? ARM_AM::asr : ARM_AM::lsl);
1736 // Inst{11-7} encodes the imm5 shift amount.
1737 unsigned ShAmt = slice(insn, 11, 7);
1739 // A8.6.183. Possible ASR shift amount of 32...
1740 if (Opc == ARM_AM::asr)
1743 Opc = ARM_AM::no_shift;
1745 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(Opc, ShAmt)));
1750 // Extend instructions.
1751 // SXT* and UXT*: Rd [Rn] Rm [rot_imm].
1752 // The 2nd operand register is Rn and the 3rd operand regsiter is Rm for the
1753 // three register operand form. Otherwise, Rn=0b1111 and only Rm is used.
1754 static bool DisassembleExtFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1755 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1758 // if d == 15 || m == 15 then UNPREDICTABLE;
1759 if (decodeRd(insn) == 15 || decodeRm(insn) == 15)
1762 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1763 unsigned &OpIdx = NumOpsAdded;
1768 && OpInfo[0].RegClass == ARM::GPRRegClassID
1769 && OpInfo[1].RegClass == ARM::GPRRegClassID
1770 && "Expect 2 reg operands");
1772 bool ThreeReg = NumOps > 2 && OpInfo[2].RegClass == ARM::GPRRegClassID;
1774 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1779 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1784 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1788 // If there is still an operand info left which is an immediate operand, add
1789 // an additional rotate immediate operand.
1790 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
1791 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1792 // Extract the 2-bit rotate field Inst{11-10}.
1793 unsigned rot = (insn >> ARMII::ExtRotImmShift) & 3;
1794 // Rotation by 8, 16, or 24 bits.
1795 MI.addOperand(MCOperand::CreateImm(rot << 3));
1802 /////////////////////////////////////
1804 // Utility Functions For VFP //
1806 /////////////////////////////////////
1808 // Extract/Decode Dd/Sd:
1810 // SP => d = UInt(Vd:D)
1811 // DP => d = UInt(D:Vd)
1812 static unsigned decodeVFPRd(uint32_t insn, bool isSPVFP) {
1813 return isSPVFP ? (decodeRd(insn) << 1 | getDBit(insn))
1814 : (decodeRd(insn) | getDBit(insn) << 4);
1817 // Extract/Decode Dn/Sn:
1819 // SP => n = UInt(Vn:N)
1820 // DP => n = UInt(N:Vn)
1821 static unsigned decodeVFPRn(uint32_t insn, bool isSPVFP) {
1822 return isSPVFP ? (decodeRn(insn) << 1 | getNBit(insn))
1823 : (decodeRn(insn) | getNBit(insn) << 4);
1826 // Extract/Decode Dm/Sm:
1828 // SP => m = UInt(Vm:M)
1829 // DP => m = UInt(M:Vm)
1830 static unsigned decodeVFPRm(uint32_t insn, bool isSPVFP) {
1831 return isSPVFP ? (decodeRm(insn) << 1 | getMBit(insn))
1832 : (decodeRm(insn) | getMBit(insn) << 4);
1836 static APInt VFPExpandImm(unsigned char byte, unsigned N) {
1837 assert(N == 32 || N == 64);
1840 unsigned bit6 = slice(byte, 6, 6);
1842 Result = slice(byte, 7, 7) << 31 | slice(byte, 5, 0) << 19;
1844 Result |= 0x1f << 25;
1846 Result |= 0x1 << 30;
1848 Result = (uint64_t)slice(byte, 7, 7) << 63 |
1849 (uint64_t)slice(byte, 5, 0) << 48;
1851 Result |= 0xffULL << 54;
1853 Result |= 0x1ULL << 62;
1855 return APInt(N, Result);
1858 // VFP Unary Format Instructions:
1860 // VCMP[E]ZD, VCMP[E]ZS: compares one floating-point register with zero
1861 // VCVTDS, VCVTSD: converts between double-precision and single-precision
1862 // The rest of the instructions have homogeneous [VFP]Rd and [VFP]Rm registers.
1863 static bool DisassembleVFPUnaryFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1864 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1866 assert(NumOps >= 1 && "VFPUnaryFrm expects NumOps >= 1");
1868 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1869 unsigned &OpIdx = NumOpsAdded;
1873 unsigned RegClass = OpInfo[OpIdx].RegClass;
1874 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1875 "Reg operand expected");
1876 bool isSP = (RegClass == ARM::SPRRegClassID);
1878 MI.addOperand(MCOperand::CreateReg(
1879 getRegisterEnum(B, RegClass, decodeVFPRd(insn, isSP))));
1882 // Early return for compare with zero instructions.
1883 if (Opcode == ARM::VCMPEZD || Opcode == ARM::VCMPEZS
1884 || Opcode == ARM::VCMPZD || Opcode == ARM::VCMPZS)
1887 RegClass = OpInfo[OpIdx].RegClass;
1888 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1889 "Reg operand expected");
1890 isSP = (RegClass == ARM::SPRRegClassID);
1892 MI.addOperand(MCOperand::CreateReg(
1893 getRegisterEnum(B, RegClass, decodeVFPRm(insn, isSP))));
1899 // All the instructions have homogeneous [VFP]Rd, [VFP]Rn, and [VFP]Rm regs.
1900 // Some of them have operand constraints which tie the first operand in the
1901 // InOperandList to that of the dst. As far as asm printing is concerned, this
1902 // tied_to operand is simply skipped.
1903 static bool DisassembleVFPBinaryFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1904 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1906 assert(NumOps >= 3 && "VFPBinaryFrm expects NumOps >= 3");
1908 const MCInstrDesc &MCID = ARMInsts[Opcode];
1909 const MCOperandInfo *OpInfo = MCID.OpInfo;
1910 unsigned &OpIdx = NumOpsAdded;
1914 unsigned RegClass = OpInfo[OpIdx].RegClass;
1915 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1916 "Reg operand expected");
1917 bool isSP = (RegClass == ARM::SPRRegClassID);
1919 MI.addOperand(MCOperand::CreateReg(
1920 getRegisterEnum(B, RegClass, decodeVFPRd(insn, isSP))));
1923 // Skip tied_to operand constraint.
1924 if (MCID.getOperandConstraint(OpIdx, MCOI::TIED_TO) != -1) {
1925 assert(NumOps >= 4 && "Expect >=4 operands");
1926 MI.addOperand(MCOperand::CreateReg(0));
1930 MI.addOperand(MCOperand::CreateReg(
1931 getRegisterEnum(B, RegClass, decodeVFPRn(insn, isSP))));
1934 MI.addOperand(MCOperand::CreateReg(
1935 getRegisterEnum(B, RegClass, decodeVFPRm(insn, isSP))));
1941 // A8.6.295 vcvt (floating-point <-> integer)
1942 // Int to FP: VSITOD, VSITOS, VUITOD, VUITOS
1943 // FP to Int: VTOSI[Z|R]D, VTOSI[Z|R]S, VTOUI[Z|R]D, VTOUI[Z|R]S
1945 // A8.6.297 vcvt (floating-point and fixed-point)
1946 // Dd|Sd Dd|Sd(TIED_TO) #fbits(= 16|32 - UInt(imm4:i))
1947 static bool DisassembleVFPConv1Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1948 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1950 assert(NumOps >= 2 && "VFPConv1Frm expects NumOps >= 2");
1952 const MCInstrDesc &MCID = ARMInsts[Opcode];
1953 const MCOperandInfo *OpInfo = MCID.OpInfo;
1954 if (!OpInfo) return false;
1956 bool SP = slice(insn, 8, 8) == 0; // A8.6.295 & A8.6.297
1957 bool fixed_point = slice(insn, 17, 17) == 1; // A8.6.297
1958 unsigned RegClassID = SP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1962 assert(NumOps >= 3 && "Expect >= 3 operands");
1963 int size = slice(insn, 7, 7) == 0 ? 16 : 32;
1964 int fbits = size - (slice(insn,3,0) << 1 | slice(insn,5,5));
1965 MI.addOperand(MCOperand::CreateReg(
1966 getRegisterEnum(B, RegClassID,
1967 decodeVFPRd(insn, SP))));
1969 assert(MCID.getOperandConstraint(1, MCOI::TIED_TO) != -1 &&
1970 "Tied to operand expected");
1971 MI.addOperand(MI.getOperand(0));
1973 assert(OpInfo[2].RegClass < 0 && !OpInfo[2].isPredicate() &&
1974 !OpInfo[2].isOptionalDef() && "Imm operand expected");
1975 MI.addOperand(MCOperand::CreateImm(fbits));
1980 // The Rd (destination) and Rm (source) bits have different interpretations
1981 // depending on their single-precisonness.
1983 if (slice(insn, 18, 18) == 1) { // to_integer operation
1984 d = decodeVFPRd(insn, true /* Is Single Precision */);
1985 MI.addOperand(MCOperand::CreateReg(
1986 getRegisterEnum(B, ARM::SPRRegClassID, d)));
1987 m = decodeVFPRm(insn, SP);
1988 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, m)));
1990 d = decodeVFPRd(insn, SP);
1991 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, d)));
1992 m = decodeVFPRm(insn, true /* Is Single Precision */);
1993 MI.addOperand(MCOperand::CreateReg(
1994 getRegisterEnum(B, ARM::SPRRegClassID, m)));
2002 // VMOVRS - A8.6.330
2003 // Rt => Rd; Sn => UInt(Vn:N)
2004 static bool DisassembleVFPConv2Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
2005 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2007 assert(NumOps >= 2 && "VFPConv2Frm expects NumOps >= 2");
2009 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2011 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
2012 decodeVFPRn(insn, true))));
2017 // VMOVRRD - A8.6.332
2018 // Rt => Rd; Rt2 => Rn; Dm => UInt(M:Vm)
2020 // VMOVRRS - A8.6.331
2021 // Rt => Rd; Rt2 => Rn; Sm => UInt(Vm:M); Sm1 = Sm+1
2022 static bool DisassembleVFPConv3Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
2023 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2025 assert(NumOps >= 3 && "VFPConv3Frm expects NumOps >= 3");
2027 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
2028 unsigned &OpIdx = NumOpsAdded;
2030 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2032 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2036 if (OpInfo[OpIdx].RegClass == ARM::SPRRegClassID) {
2037 unsigned Sm = decodeVFPRm(insn, true);
2038 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
2040 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
2044 MI.addOperand(MCOperand::CreateReg(
2045 getRegisterEnum(B, ARM::DPRRegClassID,
2046 decodeVFPRm(insn, false))));
2052 // VMOVSR - A8.6.330
2053 // Rt => Rd; Sn => UInt(Vn:N)
2054 static bool DisassembleVFPConv4Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
2055 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2057 assert(NumOps >= 2 && "VFPConv4Frm expects NumOps >= 2");
2059 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
2060 decodeVFPRn(insn, true))));
2061 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2067 // VMOVDRR - A8.6.332
2068 // Rt => Rd; Rt2 => Rn; Dm => UInt(M:Vm)
2070 // VMOVRRS - A8.6.331
2071 // Rt => Rd; Rt2 => Rn; Sm => UInt(Vm:M); Sm1 = Sm+1
2072 static bool DisassembleVFPConv5Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
2073 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2075 assert(NumOps >= 3 && "VFPConv5Frm expects NumOps >= 3");
2077 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
2078 unsigned &OpIdx = NumOpsAdded;
2082 if (OpInfo[OpIdx].RegClass == ARM::SPRRegClassID) {
2083 unsigned Sm = decodeVFPRm(insn, true);
2084 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
2086 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
2090 MI.addOperand(MCOperand::CreateReg(
2091 getRegisterEnum(B, ARM::DPRRegClassID,
2092 decodeVFPRm(insn, false))));
2096 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2098 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2104 // VFP Load/Store Instructions.
2105 // VLDRD, VLDRS, VSTRD, VSTRS
2106 static bool DisassembleVFPLdStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2107 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2109 assert(NumOps >= 3 && "VFPLdStFrm expects NumOps >= 3");
2111 bool isSPVFP = (Opcode == ARM::VLDRS || Opcode == ARM::VSTRS);
2112 unsigned RegClassID = isSPVFP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
2114 // Extract Dd/Sd for operand 0.
2115 unsigned RegD = decodeVFPRd(insn, isSPVFP);
2117 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, RegD)));
2119 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
2120 MI.addOperand(MCOperand::CreateReg(Base));
2122 // Next comes the AM5 Opcode.
2123 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
2124 unsigned char Imm8 = insn & 0xFF;
2125 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(AddrOpcode, Imm8)));
2132 // VFP Load/Store Multiple Instructions.
2133 // We have an optional write back reg, the base, and two predicate operands.
2134 // It is then followed by a reglist of either DPR(s) or SPR(s).
2136 // VLDMD[_UPD], VLDMS[_UPD], VSTMD[_UPD], VSTMS[_UPD]
2137 static bool DisassembleVFPLdStMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2138 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2140 assert(NumOps >= 4 && "VFPLdStMulFrm expects NumOps >= 4");
2142 unsigned &OpIdx = NumOpsAdded;
2146 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
2148 // Writeback to base, if necessary.
2149 if (Opcode == ARM::VLDMDIA_UPD || Opcode == ARM::VLDMSIA_UPD ||
2150 Opcode == ARM::VLDMDDB_UPD || Opcode == ARM::VLDMSDB_UPD ||
2151 Opcode == ARM::VSTMDIA_UPD || Opcode == ARM::VSTMSIA_UPD ||
2152 Opcode == ARM::VSTMDDB_UPD || Opcode == ARM::VSTMSDB_UPD) {
2153 MI.addOperand(MCOperand::CreateReg(Base));
2157 MI.addOperand(MCOperand::CreateReg(Base));
2159 // Handling the two predicate operands before the reglist.
2160 int64_t CondVal = getCondField(insn);
2163 MI.addOperand(MCOperand::CreateImm(CondVal));
2164 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
2168 bool isSPVFP = (Opcode == ARM::VLDMSIA ||
2169 Opcode == ARM::VLDMSIA_UPD || Opcode == ARM::VLDMSDB_UPD ||
2170 Opcode == ARM::VSTMSIA ||
2171 Opcode == ARM::VSTMSIA_UPD || Opcode == ARM::VSTMSDB_UPD);
2172 unsigned RegClassID = isSPVFP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
2175 unsigned RegD = decodeVFPRd(insn, isSPVFP);
2177 // Fill the variadic part of reglist.
2178 unsigned char Imm8 = insn & 0xFF;
2179 unsigned Regs = isSPVFP ? Imm8 : Imm8/2;
2181 // Apply some sanity checks before proceeding.
2182 if (Regs == 0 || (RegD + Regs) > 32 || (!isSPVFP && Regs > 16))
2185 for (unsigned i = 0; i < Regs; ++i) {
2186 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID,
2194 // Misc. VFP Instructions.
2195 // FMSTAT (vmrs with Rt=0b1111, i.e., to apsr_nzcv and no register operand)
2196 // FCONSTD (DPR and a VFPf64Imm operand)
2197 // FCONSTS (SPR and a VFPf32Imm operand)
2198 // VMRS/VMSR (GPR operand)
2199 static bool DisassembleVFPMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2200 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2202 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
2203 unsigned &OpIdx = NumOpsAdded;
2207 if (Opcode == ARM::FMSTAT)
2210 assert(NumOps >= 2 && "VFPMiscFrm expects >=2 operands");
2212 unsigned RegEnum = 0;
2213 switch (OpInfo[0].RegClass) {
2214 case ARM::DPRRegClassID:
2215 RegEnum = getRegisterEnum(B, ARM::DPRRegClassID, decodeVFPRd(insn, false));
2217 case ARM::SPRRegClassID:
2218 RegEnum = getRegisterEnum(B, ARM::SPRRegClassID, decodeVFPRd(insn, true));
2220 case ARM::GPRRegClassID:
2221 RegEnum = getRegisterEnum(B, ARM::GPRRegClassID, decodeRd(insn));
2224 assert(0 && "Invalid reg class id");
2228 MI.addOperand(MCOperand::CreateReg(RegEnum));
2231 // Extract/decode the f64/f32 immediate.
2232 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2233 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2234 // The asm syntax specifies the floating point value, not the 8-bit literal.
2235 APInt immRaw = VFPExpandImm(slice(insn,19,16) << 4 | slice(insn, 3, 0),
2236 Opcode == ARM::FCONSTD ? 64 : 32);
2237 APFloat immFP = APFloat(immRaw, true);
2238 double imm = Opcode == ARM::FCONSTD ? immFP.convertToDouble() :
2239 immFP.convertToFloat();
2240 MI.addOperand(MCOperand::CreateFPImm(imm));
2248 // DisassembleThumbFrm() is defined in ThumbDisassemblerCore.h file.
2249 #include "ThumbDisassemblerCore.h"
2251 /////////////////////////////////////////////////////
2253 // Utility Functions For ARM Advanced SIMD //
2255 /////////////////////////////////////////////////////
2257 // The following NEON namings are based on A8.6.266 VABA, VABAL. Notice that
2258 // A8.6.303 VDUP (ARM core register)'s D/Vd pair is the N/Vn pair of VABA/VABAL.
2260 // A7.3 Register encoding
2262 // Extract/Decode NEON D/Vd:
2264 // Note that for quadword, Qd = UInt(D:Vd<3:1>) = Inst{22:15-13}, whereas for
2265 // doubleword, Dd = UInt(D:Vd). We compensate for this difference by
2266 // handling it in the getRegisterEnum() utility function.
2267 // D = Inst{22}, Vd = Inst{15-12}
2268 static unsigned decodeNEONRd(uint32_t insn) {
2269 return ((insn >> ARMII::NEON_D_BitShift) & 1) << 4
2270 | ((insn >> ARMII::NEON_RegRdShift) & ARMII::NEONRegMask);
2273 // Extract/Decode NEON N/Vn:
2275 // Note that for quadword, Qn = UInt(N:Vn<3:1>) = Inst{7:19-17}, whereas for
2276 // doubleword, Dn = UInt(N:Vn). We compensate for this difference by
2277 // handling it in the getRegisterEnum() utility function.
2278 // N = Inst{7}, Vn = Inst{19-16}
2279 static unsigned decodeNEONRn(uint32_t insn) {
2280 return ((insn >> ARMII::NEON_N_BitShift) & 1) << 4
2281 | ((insn >> ARMII::NEON_RegRnShift) & ARMII::NEONRegMask);
2284 // Extract/Decode NEON M/Vm:
2286 // Note that for quadword, Qm = UInt(M:Vm<3:1>) = Inst{5:3-1}, whereas for
2287 // doubleword, Dm = UInt(M:Vm). We compensate for this difference by
2288 // handling it in the getRegisterEnum() utility function.
2289 // M = Inst{5}, Vm = Inst{3-0}
2290 static unsigned decodeNEONRm(uint32_t insn) {
2291 return ((insn >> ARMII::NEON_M_BitShift) & 1) << 4
2292 | ((insn >> ARMII::NEON_RegRmShift) & ARMII::NEONRegMask);
2303 } // End of unnamed namespace
2305 // size field -> Inst{11-10}
2306 // index_align field -> Inst{7-4}
2308 // The Lane Index interpretation depends on the Data Size:
2309 // 8 (encoded as size = 0b00) -> Index = index_align[3:1]
2310 // 16 (encoded as size = 0b01) -> Index = index_align[3:2]
2311 // 32 (encoded as size = 0b10) -> Index = index_align[3]
2313 // Ref: A8.6.317 VLD4 (single 4-element structure to one lane).
2314 static unsigned decodeLaneIndex(uint32_t insn) {
2315 unsigned size = insn >> 10 & 3;
2316 assert((size == 0 || size == 1 || size == 2) &&
2317 "Encoding error: size should be either 0, 1, or 2");
2319 unsigned index_align = insn >> 4 & 0xF;
2320 return (index_align >> 1) >> size;
2323 // imm64 = AdvSIMDExpandImm(op, cmode, i:imm3:imm4)
2324 // op = Inst{5}, cmode = Inst{11-8}
2325 // i = Inst{24} (ARM architecture)
2326 // imm3 = Inst{18-16}, imm4 = Inst{3-0}
2327 // Ref: Table A7-15 Modified immediate values for Advanced SIMD instructions.
2328 static uint64_t decodeN1VImm(uint32_t insn, ElemSize esize) {
2329 unsigned char op = (insn >> 5) & 1;
2330 unsigned char cmode = (insn >> 8) & 0xF;
2331 unsigned char Imm8 = ((insn >> 24) & 1) << 7 |
2332 ((insn >> 16) & 7) << 4 |
2334 return (op << 12) | (cmode << 8) | Imm8;
2337 // A8.6.339 VMUL, VMULL (by scalar)
2338 // ESize16 => m = Inst{2-0} (Vm<2:0>) D0-D7
2339 // ESize32 => m = Inst{3-0} (Vm<3:0>) D0-D15
2340 static unsigned decodeRestrictedDm(uint32_t insn, ElemSize esize) {
2347 assert(0 && "Unreachable code!");
2352 // A8.6.339 VMUL, VMULL (by scalar)
2353 // ESize16 => index = Inst{5:3} (M:Vm<3>) D0-D7
2354 // ESize32 => index = Inst{5} (M) D0-D15
2355 static unsigned decodeRestrictedDmIndex(uint32_t insn, ElemSize esize) {
2358 return (((insn >> 5) & 1) << 1) | ((insn >> 3) & 1);
2360 return (insn >> 5) & 1;
2362 assert(0 && "Unreachable code!");
2367 // A8.6.296 VCVT (between floating-point and fixed-point, Advanced SIMD)
2368 // (64 - <fbits>) is encoded as imm6, i.e., Inst{21-16}.
2369 static unsigned decodeVCVTFractionBits(uint32_t insn) {
2370 return 64 - ((insn >> 16) & 0x3F);
2373 // A8.6.302 VDUP (scalar)
2374 // ESize8 => index = Inst{19-17}
2375 // ESize16 => index = Inst{19-18}
2376 // ESize32 => index = Inst{19}
2377 static unsigned decodeNVLaneDupIndex(uint32_t insn, ElemSize esize) {
2380 return (insn >> 17) & 7;
2382 return (insn >> 18) & 3;
2384 return (insn >> 19) & 1;
2386 assert(0 && "Unspecified element size!");
2391 // A8.6.328 VMOV (ARM core register to scalar)
2392 // A8.6.329 VMOV (scalar to ARM core register)
2393 // ESize8 => index = Inst{21:6-5}
2394 // ESize16 => index = Inst{21:6}
2395 // ESize32 => index = Inst{21}
2396 static unsigned decodeNVLaneOpIndex(uint32_t insn, ElemSize esize) {
2399 return ((insn >> 21) & 1) << 2 | ((insn >> 5) & 3);
2401 return ((insn >> 21) & 1) << 1 | ((insn >> 6) & 1);
2403 return ((insn >> 21) & 1);
2405 assert(0 && "Unspecified element size!");
2410 // Imm6 = Inst{21-16}, L = Inst{7}
2412 // LeftShift == true (A8.6.367 VQSHL, A8.6.387 VSLI):
2414 // '0001xxx' => esize = 8; shift_amount = imm6 - 8
2415 // '001xxxx' => esize = 16; shift_amount = imm6 - 16
2416 // '01xxxxx' => esize = 32; shift_amount = imm6 - 32
2417 // '1xxxxxx' => esize = 64; shift_amount = imm6
2419 // LeftShift == false (A8.6.376 VRSHR, A8.6.368 VQSHRN):
2421 // '0001xxx' => esize = 8; shift_amount = 16 - imm6
2422 // '001xxxx' => esize = 16; shift_amount = 32 - imm6
2423 // '01xxxxx' => esize = 32; shift_amount = 64 - imm6
2424 // '1xxxxxx' => esize = 64; shift_amount = 64 - imm6
2426 static unsigned decodeNVSAmt(uint32_t insn, bool LeftShift) {
2427 ElemSize esize = ESizeNA;
2428 unsigned L = (insn >> 7) & 1;
2429 unsigned imm6 = (insn >> 16) & 0x3F;
2433 else if (imm6 >> 4 == 1)
2435 else if (imm6 >> 5 == 1)
2438 assert(0 && "Wrong encoding of Inst{7:21-16}!");
2443 return esize == ESize64 ? imm6 : (imm6 - esize);
2445 return esize == ESize64 ? (esize - imm6) : (2*esize - imm6);
2449 // Imm4 = Inst{11-8}
2450 static unsigned decodeN3VImm(uint32_t insn) {
2451 return (insn >> 8) & 0xF;
2455 // D[d] D[d2] ... Rn [TIED_TO Rn] align [Rm]
2457 // D[d] D[d2] ... Rn [TIED_TO Rn] align [Rm] TIED_TO ... imm(idx)
2459 // Rn [TIED_TO Rn] align [Rm] D[d] D[d2] ...
2461 // Rn [TIED_TO Rn] align [Rm] D[d] D[d2] ... [imm(idx)]
2463 // Correctly set VLD*/VST*'s TIED_TO GPR, as the asm printer needs it.
2464 static bool DisassembleNLdSt0(MCInst &MI, unsigned Opcode, uint32_t insn,
2465 unsigned short NumOps, unsigned &NumOpsAdded, bool Store, bool DblSpaced,
2466 unsigned alignment, BO B) {
2468 const MCInstrDesc &MCID = ARMInsts[Opcode];
2469 const MCOperandInfo *OpInfo = MCID.OpInfo;
2471 // At least one DPR register plus addressing mode #6.
2472 assert(NumOps >= 3 && "Expect >= 3 operands");
2474 unsigned &OpIdx = NumOpsAdded;
2478 // We have homogeneous NEON registers for Load/Store.
2479 unsigned RegClass = 0;
2481 // Double-spaced registers have increments of 2.
2482 unsigned Inc = DblSpaced ? 2 : 1;
2484 unsigned Rn = decodeRn(insn);
2485 unsigned Rm = decodeRm(insn);
2486 unsigned Rd = decodeNEONRd(insn);
2488 // A7.7.1 Advanced SIMD addressing mode.
2491 // LLVM Addressing Mode #6.
2492 unsigned RmEnum = 0;
2494 RmEnum = getRegisterEnum(B, ARM::GPRRegClassID, Rm);
2497 // Consume possible WB, AddrMode6, possible increment reg, the DPR/QPR's,
2498 // then possible lane index.
2499 assert(OpIdx < NumOps && OpInfo[0].RegClass == ARM::GPRRegClassID &&
2500 "Reg operand expected");
2503 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2508 assert((OpIdx+1) < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
2509 OpInfo[OpIdx + 1].RegClass < 0 && "Addrmode #6 Operands expected");
2510 // addrmode6 := (ops GPR:$addr, i32imm)
2511 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2513 MI.addOperand(MCOperand::CreateImm(alignment)); // Alignment
2517 MI.addOperand(MCOperand::CreateReg(RmEnum));
2521 assert(OpIdx < NumOps &&
2522 (OpInfo[OpIdx].RegClass == ARM::DPRRegClassID ||
2523 OpInfo[OpIdx].RegClass == ARM::QPRRegClassID) &&
2524 "Reg operand expected");
2526 RegClass = OpInfo[OpIdx].RegClass;
2527 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2528 MI.addOperand(MCOperand::CreateReg(
2529 getRegisterEnum(B, RegClass, Rd)));
2534 // Handle possible lane index.
2535 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2536 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2537 MI.addOperand(MCOperand::CreateImm(decodeLaneIndex(insn)));
2542 // Consume the DPR/QPR's, possible WB, AddrMode6, possible incrment reg,
2543 // possible TIED_TO DPR/QPR's (ignored), then possible lane index.
2544 RegClass = OpInfo[0].RegClass;
2546 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2547 MI.addOperand(MCOperand::CreateReg(
2548 getRegisterEnum(B, RegClass, Rd)));
2554 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2559 assert((OpIdx+1) < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
2560 OpInfo[OpIdx + 1].RegClass < 0 && "Addrmode #6 Operands expected");
2561 // addrmode6 := (ops GPR:$addr, i32imm)
2562 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2564 MI.addOperand(MCOperand::CreateImm(alignment)); // Alignment
2568 MI.addOperand(MCOperand::CreateReg(RmEnum));
2572 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2573 assert(MCID.getOperandConstraint(OpIdx, MCOI::TIED_TO) != -1 &&
2574 "Tied to operand expected");
2575 MI.addOperand(MCOperand::CreateReg(0));
2579 // Handle possible lane index.
2580 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2581 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2582 MI.addOperand(MCOperand::CreateImm(decodeLaneIndex(insn)));
2587 // Accessing registers past the end of the NEON register file is not
2595 // A8.6.308, A8.6.311, A8.6.314, A8.6.317.
2596 static bool Align4OneLaneInst(unsigned elem, unsigned size,
2597 unsigned index_align, unsigned & alignment) {
2605 return slice(index_align, 0, 0) == 0;
2606 else if (size == 1) {
2607 bits = slice(index_align, 1, 0);
2608 if (bits != 0 && bits != 1)
2613 } else if (size == 2) {
2614 bits = slice(index_align, 2, 0);
2615 if (bits != 0 && bits != 3)
2625 if (slice(index_align, 0, 0) == 1)
2629 if (slice(index_align, 0, 0) == 1)
2632 } else if (size == 2) {
2633 if (slice(index_align, 1, 1) != 0)
2635 if (slice(index_align, 0, 0) == 1)
2643 if (slice(index_align, 0, 0) != 0)
2647 if (slice(index_align, 0, 0) != 0)
2651 } else if (size == 2) {
2652 if (slice(index_align, 1, 0) != 0)
2660 if (slice(index_align, 0, 0) == 1)
2664 if (slice(index_align, 0, 0) == 1)
2667 } else if (size == 2) {
2668 bits = slice(index_align, 1, 0);
2682 // If L (Inst{21}) == 0, store instructions.
2683 // Find out about double-spaced-ness of the Opcode and pass it on to
2684 // DisassembleNLdSt0().
2685 static bool DisassembleNLdSt(MCInst &MI, unsigned Opcode, uint32_t insn,
2686 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2688 const StringRef Name = ARMInsts[Opcode].Name;
2689 bool DblSpaced = false;
2690 // 0 represents standard alignment, i.e., unaligned data access.
2691 unsigned alignment = 0;
2693 unsigned elem = 0; // legal values: {1, 2, 3, 4}
2694 if (Name.startswith("VST1") || Name.startswith("VLD1"))
2697 if (Name.startswith("VST2") || Name.startswith("VLD2"))
2700 if (Name.startswith("VST3") || Name.startswith("VLD3"))
2703 if (Name.startswith("VST4") || Name.startswith("VLD4"))
2706 if (Name.find("LN") != std::string::npos) {
2707 // To one lane instructions.
2708 // See, for example, 8.6.317 VLD4 (single 4-element structure to one lane).
2710 // Utility function takes number of elements, size, and index_align.
2711 if (!Align4OneLaneInst(elem,
2712 slice(insn, 11, 10),
2717 // <size> == 16 && Inst{5} == 1 --> DblSpaced = true
2718 if (Name.endswith("16") || Name.endswith("16_UPD"))
2719 DblSpaced = slice(insn, 5, 5) == 1;
2721 // <size> == 32 && Inst{6} == 1 --> DblSpaced = true
2722 if (Name.endswith("32") || Name.endswith("32_UPD"))
2723 DblSpaced = slice(insn, 6, 6) == 1;
2724 } else if (Name.find("DUP") != std::string::npos) {
2725 // Single element (or structure) to all lanes.
2726 // Inst{9-8} encodes the number of element(s) in the structure, with:
2727 // 0b00 (VLD1DUP) (for this, a bit makes sense only for data size 16 and 32.
2729 // 0b10 (VLD3DUP) (for this, a bit must be encoded as 0)
2732 // Inst{7-6} encodes the data size, with:
2733 // 0b00 => 8, 0b01 => 16, 0b10 => 32
2735 // Inst{4} (the a bit) encodes the align action (0: standard alignment)
2736 unsigned elem = slice(insn, 9, 8) + 1;
2737 unsigned a = slice(insn, 4, 4);
2739 // 0b11 is not a valid encoding for Inst{7-6}.
2740 if (slice(insn, 7, 6) == 3)
2742 unsigned data_size = 8 << slice(insn, 7, 6);
2743 // For VLD1DUP, a bit makes sense only for data size of 16 and 32.
2744 if (a && data_size == 8)
2747 // Now we can calculate the alignment!
2749 alignment = elem * data_size;
2752 // A8.6.315 VLD3 (single 3-element structure to all lanes)
2753 // The a bit must be encoded as 0.
2758 // Multiple n-element structures with type encoded as Inst{11-8}.
2759 // See, for example, A8.6.316 VLD4 (multiple 4-element structures).
2761 // Inst{5-4} encodes alignment.
2762 unsigned align = slice(insn, 5, 4);
2767 alignment = 64; break;
2769 alignment = 128; break;
2771 alignment = 256; break;
2774 unsigned type = slice(insn, 11, 8);
2775 // Reject UNDEFINED instructions based on type and align.
2776 // Plus set DblSpaced flag where appropriate.
2782 // A8.6.307 & A8.6.391
2783 if ((type == 7 && slice(align, 1, 1) == 1) ||
2784 (type == 10 && align == 3) ||
2785 (type == 6 && slice(align, 1, 1) == 1))
2789 // n == 2 && type == 0b1001 -> DblSpaced = true
2790 // A8.6.310 & A8.6.393
2791 if ((type == 8 || type == 9) && align == 3)
2793 DblSpaced = (type == 9);
2796 // n == 3 && type == 0b0101 -> DblSpaced = true
2797 // A8.6.313 & A8.6.395
2798 if (slice(insn, 7, 6) == 3 || slice(align, 1, 1) == 1)
2800 DblSpaced = (type == 5);
2803 // n == 4 && type == 0b0001 -> DblSpaced = true
2804 // A8.6.316 & A8.6.397
2805 if (slice(insn, 7, 6) == 3)
2807 DblSpaced = (type == 1);
2811 return DisassembleNLdSt0(MI, Opcode, insn, NumOps, NumOpsAdded,
2812 slice(insn, 21, 21) == 0, DblSpaced, alignment/8, B);
2819 // Qd/Dd imm src(=Qd/Dd)
2820 static bool DisassembleN1RegModImmFrm(MCInst &MI, unsigned Opcode,
2821 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2823 const MCInstrDesc &MCID = ARMInsts[Opcode];
2824 const MCOperandInfo *OpInfo = MCID.OpInfo;
2826 assert(NumOps >= 2 &&
2827 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2828 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2829 (OpInfo[1].RegClass < 0) &&
2830 "Expect 1 reg operand followed by 1 imm operand");
2832 // Qd/Dd = Inst{22:15-12} => NEON Rd
2833 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[0].RegClass,
2834 decodeNEONRd(insn))));
2836 ElemSize esize = ESizeNA;
2839 case ARM::VMOVv16i8:
2842 case ARM::VMOVv4i16:
2843 case ARM::VMOVv8i16:
2844 case ARM::VMVNv4i16:
2845 case ARM::VMVNv8i16:
2846 case ARM::VBICiv4i16:
2847 case ARM::VBICiv8i16:
2848 case ARM::VORRiv4i16:
2849 case ARM::VORRiv8i16:
2852 case ARM::VMOVv2i32:
2853 case ARM::VMOVv4i32:
2854 case ARM::VMVNv2i32:
2855 case ARM::VMVNv4i32:
2856 case ARM::VBICiv2i32:
2857 case ARM::VBICiv4i32:
2858 case ARM::VORRiv2i32:
2859 case ARM::VORRiv4i32:
2862 case ARM::VMOVv1i64:
2863 case ARM::VMOVv2i64:
2867 assert(0 && "Unexpected opcode!");
2871 // One register and a modified immediate value.
2872 // Add the imm operand.
2873 MI.addOperand(MCOperand::CreateImm(decodeN1VImm(insn, esize)));
2877 // VBIC/VORRiv*i* variants have an extra $src = $Vd to be filled in.
2879 (OpInfo[2].RegClass == ARM::DPRRegClassID ||
2880 OpInfo[2].RegClass == ARM::QPRRegClassID)) {
2881 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[0].RegClass,
2882 decodeNEONRd(insn))));
2893 N2V_VectorConvert_Between_Float_Fixed
2895 } // End of unnamed namespace
2897 // Vector Convert [between floating-point and fixed-point]
2898 // Qd/Dd Qm/Dm [fbits]
2900 // Vector Duplicate Lane (from scalar to all elements) Instructions.
2901 // VDUPLN16d, VDUPLN16q, VDUPLN32d, VDUPLN32q, VDUPLN8d, VDUPLN8q:
2904 // Vector Move Long:
2907 // Vector Move Narrow:
2911 static bool DisassembleNVdVmOptImm(MCInst &MI, unsigned Opc, uint32_t insn,
2912 unsigned short NumOps, unsigned &NumOpsAdded, N2VFlag Flag, BO B) {
2914 const MCInstrDesc &MCID = ARMInsts[Opc];
2915 const MCOperandInfo *OpInfo = MCID.OpInfo;
2917 assert(NumOps >= 2 &&
2918 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2919 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2920 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2921 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2922 "Expect >= 2 operands and first 2 as reg operands");
2924 unsigned &OpIdx = NumOpsAdded;
2928 ElemSize esize = ESizeNA;
2929 if (Flag == N2V_VectorDupLane) {
2930 // VDUPLN has its index embedded. Its size can be inferred from the Opcode.
2931 assert(Opc >= ARM::VDUPLN16d && Opc <= ARM::VDUPLN8q &&
2932 "Unexpected Opcode");
2933 esize = (Opc == ARM::VDUPLN8d || Opc == ARM::VDUPLN8q) ? ESize8
2934 : ((Opc == ARM::VDUPLN16d || Opc == ARM::VDUPLN16q) ? ESize16
2938 // Qd/Dd = Inst{22:15-12} => NEON Rd
2939 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2940 decodeNEONRd(insn))));
2944 if (MCID.getOperandConstraint(OpIdx, MCOI::TIED_TO) != -1) {
2946 MI.addOperand(MCOperand::CreateReg(0));
2950 // Dm = Inst{5:3-0} => NEON Rm
2951 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2952 decodeNEONRm(insn))));
2955 // VZIP and others have two TIED_TO reg operands.
2957 while (OpIdx < NumOps &&
2958 (Idx = MCID.getOperandConstraint(OpIdx, MCOI::TIED_TO)) != -1) {
2959 // Add TIED_TO operand.
2960 MI.addOperand(MI.getOperand(Idx));
2964 // Add the imm operand, if required.
2965 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2966 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2968 unsigned imm = 0xFFFFFFFF;
2970 if (Flag == N2V_VectorDupLane)
2971 imm = decodeNVLaneDupIndex(insn, esize);
2972 if (Flag == N2V_VectorConvert_Between_Float_Fixed)
2973 imm = decodeVCVTFractionBits(insn);
2975 assert(imm != 0xFFFFFFFF && "Internal error");
2976 MI.addOperand(MCOperand::CreateImm(imm));
2983 static bool DisassembleN2RegFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2984 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2986 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2989 static bool DisassembleNVCVTFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2990 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2992 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2993 N2V_VectorConvert_Between_Float_Fixed, B);
2995 static bool DisassembleNVecDupLnFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2996 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2998 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2999 N2V_VectorDupLane, B);
3002 // Vector Shift [Accumulate] Instructions.
3003 // Qd/Dd [Qd/Dd (TIED_TO)] Qm/Dm ShiftAmt
3005 // Vector Shift Left Long (with maximum shift count) Instructions.
3006 // VSHLLi16, VSHLLi32, VSHLLi8: Qd Dm imm (== size)
3008 static bool DisassembleNVectorShift(MCInst &MI, unsigned Opcode, uint32_t insn,
3009 unsigned short NumOps, unsigned &NumOpsAdded, bool LeftShift, BO B) {
3011 const MCInstrDesc &MCID = ARMInsts[Opcode];
3012 const MCOperandInfo *OpInfo = MCID.OpInfo;
3014 assert(NumOps >= 3 &&
3015 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
3016 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
3017 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
3018 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
3019 "Expect >= 3 operands and first 2 as reg operands");
3021 unsigned &OpIdx = NumOpsAdded;
3025 // Qd/Dd = Inst{22:15-12} => NEON Rd
3026 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
3027 decodeNEONRd(insn))));
3030 if (MCID.getOperandConstraint(OpIdx, MCOI::TIED_TO) != -1) {
3032 MI.addOperand(MCOperand::CreateReg(0));
3036 assert((OpInfo[OpIdx].RegClass == ARM::DPRRegClassID ||
3037 OpInfo[OpIdx].RegClass == ARM::QPRRegClassID) &&
3038 "Reg operand expected");
3040 // Qm/Dm = Inst{5:3-0} => NEON Rm
3041 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
3042 decodeNEONRm(insn))));
3045 assert(OpInfo[OpIdx].RegClass < 0 && "Imm operand expected");
3047 // Add the imm operand.
3049 // VSHLL has maximum shift count as the imm, inferred from its size.
3053 Imm = decodeNVSAmt(insn, LeftShift);
3065 MI.addOperand(MCOperand::CreateImm(Imm));
3071 // Left shift instructions.
3072 static bool DisassembleN2RegVecShLFrm(MCInst &MI, unsigned Opcode,
3073 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3075 return DisassembleNVectorShift(MI, Opcode, insn, NumOps, NumOpsAdded, true,
3078 // Right shift instructions have different shift amount interpretation.
3079 static bool DisassembleN2RegVecShRFrm(MCInst &MI, unsigned Opcode,
3080 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3082 return DisassembleNVectorShift(MI, Opcode, insn, NumOps, NumOpsAdded, false,
3091 N3V_Multiply_By_Scalar
3093 } // End of unnamed namespace
3095 // NEON Three Register Instructions with Optional Immediate Operand
3097 // Vector Extract Instructions.
3098 // Qd/Dd Qn/Dn Qm/Dm imm4
3100 // Vector Shift (Register) Instructions.
3101 // Qd/Dd Qm/Dm Qn/Dn (notice the order of m, n)
3103 // Vector Multiply [Accumulate/Subtract] [Long] By Scalar Instructions.
3104 // Qd/Dd Qn/Dn RestrictedDm index
3107 static bool DisassembleNVdVnVmOptImm(MCInst &MI, unsigned Opcode, uint32_t insn,
3108 unsigned short NumOps, unsigned &NumOpsAdded, N3VFlag Flag, BO B) {
3110 const MCInstrDesc &MCID = ARMInsts[Opcode];
3111 const MCOperandInfo *OpInfo = MCID.OpInfo;
3113 // No checking for OpInfo[2] because of MOVDneon/MOVQ with only two regs.
3114 assert(NumOps >= 3 &&
3115 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
3116 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
3117 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
3118 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
3119 "Expect >= 3 operands and first 2 as reg operands");
3121 unsigned &OpIdx = NumOpsAdded;
3125 bool VdVnVm = Flag == N3V_VectorShift ? false : true;
3126 bool IsImm4 = Flag == N3V_VectorExtract ? true : false;
3127 bool IsDmRestricted = Flag == N3V_Multiply_By_Scalar ? true : false;
3128 ElemSize esize = ESizeNA;
3129 if (Flag == N3V_Multiply_By_Scalar) {
3130 unsigned size = (insn >> 20) & 3;
3131 if (size == 1) esize = ESize16;
3132 if (size == 2) esize = ESize32;
3133 assert (esize == ESize16 || esize == ESize32);
3136 // Qd/Dd = Inst{22:15-12} => NEON Rd
3137 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
3138 decodeNEONRd(insn))));
3141 // VABA, VABAL, VBSLd, VBSLq, ...
3142 if (MCID.getOperandConstraint(OpIdx, MCOI::TIED_TO) != -1) {
3144 MI.addOperand(MCOperand::CreateReg(0));
3148 // Dn = Inst{7:19-16} => NEON Rn
3150 // Dm = Inst{5:3-0} => NEON Rm
3151 MI.addOperand(MCOperand::CreateReg(
3152 getRegisterEnum(B, OpInfo[OpIdx].RegClass,
3153 VdVnVm ? decodeNEONRn(insn)
3154 : decodeNEONRm(insn))));
3157 // Dm = Inst{5:3-0} => NEON Rm
3159 // Dm is restricted to D0-D7 if size is 16, D0-D15 otherwise
3161 // Dn = Inst{7:19-16} => NEON Rn
3162 unsigned m = VdVnVm ? (IsDmRestricted ? decodeRestrictedDm(insn, esize)
3163 : decodeNEONRm(insn))
3164 : decodeNEONRn(insn);
3166 MI.addOperand(MCOperand::CreateReg(
3167 getRegisterEnum(B, OpInfo[OpIdx].RegClass, m)));
3170 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
3171 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
3172 // Add the imm operand.
3175 Imm = decodeN3VImm(insn);
3176 else if (IsDmRestricted)
3177 Imm = decodeRestrictedDmIndex(insn, esize);
3179 assert(0 && "Internal error: unreachable code!");
3183 MI.addOperand(MCOperand::CreateImm(Imm));
3190 static bool DisassembleN3RegFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3191 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3193 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
3196 static bool DisassembleN3RegVecShFrm(MCInst &MI, unsigned Opcode,
3197 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3199 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
3200 N3V_VectorShift, B);
3202 static bool DisassembleNVecExtractFrm(MCInst &MI, unsigned Opcode,
3203 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3205 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
3206 N3V_VectorExtract, B);
3208 static bool DisassembleNVecMulScalarFrm(MCInst &MI, unsigned Opcode,
3209 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3211 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
3212 N3V_Multiply_By_Scalar, B);
3215 // Vector Table Lookup
3217 // VTBL1, VTBX1: Dd [Dd(TIED_TO)] Dn Dm
3218 // VTBL2, VTBX2: Dd [Dd(TIED_TO)] Dn Dn+1 Dm
3219 // VTBL3, VTBX3: Dd [Dd(TIED_TO)] Dn Dn+1 Dn+2 Dm
3220 // VTBL4, VTBX4: Dd [Dd(TIED_TO)] Dn Dn+1 Dn+2 Dn+3 Dm
3221 static bool DisassembleNVTBLFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3222 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3224 const MCInstrDesc &MCID = ARMInsts[Opcode];
3225 const MCOperandInfo *OpInfo = MCID.OpInfo;
3226 if (!OpInfo) return false;
3228 assert(NumOps >= 3 &&
3229 OpInfo[0].RegClass == ARM::DPRRegClassID &&
3230 OpInfo[1].RegClass == ARM::DPRRegClassID &&
3231 OpInfo[2].RegClass == ARM::DPRRegClassID &&
3232 "Expect >= 3 operands and first 3 as reg operands");
3234 unsigned &OpIdx = NumOpsAdded;
3238 unsigned Rn = decodeNEONRn(insn);
3240 // {Dn} encoded as len = 0b00
3241 // {Dn Dn+1} encoded as len = 0b01
3242 // {Dn Dn+1 Dn+2 } encoded as len = 0b10
3243 // {Dn Dn+1 Dn+2 Dn+3} encoded as len = 0b11
3244 unsigned Len = slice(insn, 9, 8) + 1;
3246 // Dd (the destination vector)
3247 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
3248 decodeNEONRd(insn))));
3251 // Process tied_to operand constraint.
3253 if ((Idx = MCID.getOperandConstraint(OpIdx, MCOI::TIED_TO)) != -1) {
3254 MI.addOperand(MI.getOperand(Idx));
3258 // Do the <list> now.
3259 for (unsigned i = 0; i < Len; ++i) {
3260 assert(OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::DPRRegClassID &&
3261 "Reg operand expected");
3262 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
3267 // Dm (the index vector)
3268 assert(OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::DPRRegClassID &&
3269 "Reg operand (index vector) expected");
3270 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
3271 decodeNEONRm(insn))));
3277 // Vector Get Lane (move scalar to ARM core register) Instructions.
3278 // VGETLNi32, VGETLNs16, VGETLNs8, VGETLNu16, VGETLNu8: Rt Dn index
3279 static bool DisassembleNGetLnFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3280 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3282 const MCInstrDesc &MCID = ARMInsts[Opcode];
3283 const MCOperandInfo *OpInfo = MCID.OpInfo;
3284 if (!OpInfo) return false;
3286 assert(MCID.getNumDefs() == 1 && NumOps >= 3 &&
3287 OpInfo[0].RegClass == ARM::GPRRegClassID &&
3288 OpInfo[1].RegClass == ARM::DPRRegClassID &&
3289 OpInfo[2].RegClass < 0 &&
3290 "Expect >= 3 operands with one dst operand");
3293 Opcode == ARM::VGETLNi32 ? ESize32
3294 : ((Opcode == ARM::VGETLNs16 || Opcode == ARM::VGETLNu16) ? ESize16
3297 // Rt = Inst{15-12} => ARM Rd
3298 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3301 // Dn = Inst{7:19-16} => NEON Rn
3302 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
3303 decodeNEONRn(insn))));
3305 MI.addOperand(MCOperand::CreateImm(decodeNVLaneOpIndex(insn, esize)));
3311 // Vector Set Lane (move ARM core register to scalar) Instructions.
3312 // VSETLNi16, VSETLNi32, VSETLNi8: Dd Dd (TIED_TO) Rt index
3313 static bool DisassembleNSetLnFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3314 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3316 const MCInstrDesc &MCID = ARMInsts[Opcode];
3317 const MCOperandInfo *OpInfo = MCID.OpInfo;
3318 if (!OpInfo) return false;
3320 assert(MCID.getNumDefs() == 1 && NumOps >= 3 &&
3321 OpInfo[0].RegClass == ARM::DPRRegClassID &&
3322 OpInfo[1].RegClass == ARM::DPRRegClassID &&
3323 MCID.getOperandConstraint(1, MCOI::TIED_TO) != -1 &&
3324 OpInfo[2].RegClass == ARM::GPRRegClassID &&
3325 OpInfo[3].RegClass < 0 &&
3326 "Expect >= 3 operands with one dst operand");
3329 Opcode == ARM::VSETLNi8 ? ESize8
3330 : (Opcode == ARM::VSETLNi16 ? ESize16
3333 // Dd = Inst{7:19-16} => NEON Rn
3334 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
3335 decodeNEONRn(insn))));
3338 MI.addOperand(MCOperand::CreateReg(0));
3340 // Rt = Inst{15-12} => ARM Rd
3341 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3344 MI.addOperand(MCOperand::CreateImm(decodeNVLaneOpIndex(insn, esize)));
3350 // Vector Duplicate Instructions (from ARM core register to all elements).
3351 // VDUP8d, VDUP16d, VDUP32d, VDUP8q, VDUP16q, VDUP32q: Qd/Dd Rt
3352 static bool DisassembleNDupFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3353 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3355 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3357 assert(NumOps >= 2 &&
3358 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
3359 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
3360 OpInfo[1].RegClass == ARM::GPRRegClassID &&
3361 "Expect >= 2 operands and first 2 as reg operand");
3363 unsigned RegClass = OpInfo[0].RegClass;
3365 // Qd/Dd = Inst{7:19-16} => NEON Rn
3366 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClass,
3367 decodeNEONRn(insn))));
3369 // Rt = Inst{15-12} => ARM Rd
3370 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3377 static inline bool PreLoadOpcode(unsigned Opcode) {
3379 case ARM::PLDi12: case ARM::PLDrs:
3380 case ARM::PLDWi12: case ARM::PLDWrs:
3381 case ARM::PLIi12: case ARM::PLIrs:
3388 static bool DisassemblePreLoadFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3389 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3391 // Preload Data/Instruction requires either 2 or 3 operands.
3392 // PLDi12, PLDWi12, PLIi12: addrmode_imm12
3393 // PLDrs, PLDWrs, PLIrs: ldst_so_reg
3395 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3398 if (Opcode == ARM::PLDi12 || Opcode == ARM::PLDWi12
3399 || Opcode == ARM::PLIi12) {
3400 unsigned Imm12 = slice(insn, 11, 0);
3401 bool Negative = getUBit(insn) == 0;
3403 // A8.6.118 PLD (literal) PLDWi12 with Rn=PC is transformed to PLDi12.
3404 if (Opcode == ARM::PLDWi12 && slice(insn, 19, 16) == 0xF) {
3405 DEBUG(errs() << "Rn == '1111': PLDWi12 morphed to PLDi12\n");
3406 MI.setOpcode(ARM::PLDi12);
3409 // -0 is represented specially. All other values are as normal.
3410 int Offset = Negative ? -1 * Imm12 : Imm12;
3411 if (Imm12 == 0 && Negative)
3414 MI.addOperand(MCOperand::CreateImm(Offset));
3417 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3420 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
3422 // Inst{6-5} encodes the shift opcode.
3423 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
3424 // Inst{11-7} encodes the imm5 shift amount.
3425 unsigned ShImm = slice(insn, 11, 7);
3427 // A8.4.1. Possible rrx or shift amount of 32...
3428 getImmShiftSE(ShOp, ShImm);
3429 MI.addOperand(MCOperand::CreateImm(
3430 ARM_AM::getAM2Opc(AddrOpcode, ShImm, ShOp)));
3437 static bool DisassembleMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3438 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3440 if (Opcode == ARM::DMB || Opcode == ARM::DSB || Opcode == ARM::ISB) {
3441 // Inst{3-0} encodes the memory barrier option for the variants.
3442 unsigned opt = slice(insn, 3, 0);
3444 case ARM_MB::SY: case ARM_MB::ST:
3445 case ARM_MB::ISH: case ARM_MB::ISHST:
3446 case ARM_MB::NSH: case ARM_MB::NSHST:
3447 case ARM_MB::OSH: case ARM_MB::OSHST:
3448 MI.addOperand(MCOperand::CreateImm(opt));
3467 // SWP, SWPB: Rd Rm Rn
3468 // Delegate to DisassembleLdStExFrm()....
3469 return DisassembleLdStExFrm(MI, Opcode, insn, NumOps, NumOpsAdded, B);
3474 if (Opcode == ARM::SETEND) {
3476 MI.addOperand(MCOperand::CreateImm(slice(insn, 9, 9)));
3480 // FIXME: To enable correct asm parsing and disasm of CPS we need 3 different
3481 // opcodes which match the same real instruction. This is needed since there's
3482 // no current handling of optional arguments. Fix here when a better handling
3483 // of optional arguments is implemented.
3484 if (Opcode == ARM::CPS3p) { // M = 1
3485 // Let's reject these impossible imod values by returning false:
3488 // AsmPrinter cannot handle imod=0b00, plus (imod=0b00,M=1,iflags!=0) is an
3489 // invalid combination, so we just check for imod=0b00 here.
3490 if (slice(insn, 19, 18) == 0 || slice(insn, 19, 18) == 1)
3492 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 18))); // imod
3493 MI.addOperand(MCOperand::CreateImm(slice(insn, 8, 6))); // iflags
3494 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0))); // mode
3498 if (Opcode == ARM::CPS2p) { // mode = 0, M = 0
3499 // Let's reject these impossible imod values by returning false:
3500 // 1. (imod=0b00,M=0)
3502 if (slice(insn, 19, 18) == 0 || slice(insn, 19, 18) == 1)
3504 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 18))); // imod
3505 MI.addOperand(MCOperand::CreateImm(slice(insn, 8, 6))); // iflags
3509 if (Opcode == ARM::CPS1p) { // imod = 0, iflags = 0, M = 1
3510 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0))); // mode
3515 // DBG has its option specified in Inst{3-0}.
3516 if (Opcode == ARM::DBG) {
3517 MI.addOperand(MCOperand::CreateImm(slice(insn, 3, 0)));
3522 // BKPT takes an imm32 val equal to ZeroExtend(Inst{19-8:3-0}).
3523 if (Opcode == ARM::BKPT) {
3524 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 8) << 4 |
3525 slice(insn, 3, 0)));
3530 if (PreLoadOpcode(Opcode))
3531 return DisassemblePreLoadFrm(MI, Opcode, insn, NumOps, NumOpsAdded, B);
3533 assert(0 && "Unexpected misc instruction!");
3537 /// FuncPtrs - FuncPtrs maps ARMFormat to its corresponding DisassembleFP.
3538 /// We divide the disassembly task into different categories, with each one
3539 /// corresponding to a specific instruction encoding format. There could be
3540 /// exceptions when handling a specific format, and that is why the Opcode is
3541 /// also present in the function prototype.
3542 static const DisassembleFP FuncPtrs[] = {
3546 &DisassembleBrMiscFrm,
3548 &DisassembleDPSoRegRegFrm,
3551 &DisassembleLdMiscFrm,
3552 &DisassembleStMiscFrm,
3553 &DisassembleLdStMulFrm,
3554 &DisassembleLdStExFrm,
3555 &DisassembleArithMiscFrm,
3558 &DisassembleVFPUnaryFrm,
3559 &DisassembleVFPBinaryFrm,
3560 &DisassembleVFPConv1Frm,
3561 &DisassembleVFPConv2Frm,
3562 &DisassembleVFPConv3Frm,
3563 &DisassembleVFPConv4Frm,
3564 &DisassembleVFPConv5Frm,
3565 &DisassembleVFPLdStFrm,
3566 &DisassembleVFPLdStMulFrm,
3567 &DisassembleVFPMiscFrm,
3568 &DisassembleThumbFrm,
3569 &DisassembleMiscFrm,
3570 &DisassembleNGetLnFrm,
3571 &DisassembleNSetLnFrm,
3572 &DisassembleNDupFrm,
3574 // VLD and VST (including one lane) Instructions.
3577 // A7.4.6 One register and a modified immediate value
3578 // 1-Register Instructions with imm.
3579 // LLVM only defines VMOVv instructions.
3580 &DisassembleN1RegModImmFrm,
3582 // 2-Register Instructions with no imm.
3583 &DisassembleN2RegFrm,
3585 // 2-Register Instructions with imm (vector convert float/fixed point).
3586 &DisassembleNVCVTFrm,
3588 // 2-Register Instructions with imm (vector dup lane).
3589 &DisassembleNVecDupLnFrm,
3591 // Vector Shift Left Instructions.
3592 &DisassembleN2RegVecShLFrm,
3594 // Vector Shift Righ Instructions, which has different interpretation of the
3595 // shift amount from the imm6 field.
3596 &DisassembleN2RegVecShRFrm,
3598 // 3-Register Data-Processing Instructions.
3599 &DisassembleN3RegFrm,
3601 // Vector Shift (Register) Instructions.
3602 // D:Vd M:Vm N:Vn (notice that M:Vm is the first operand)
3603 &DisassembleN3RegVecShFrm,
3605 // Vector Extract Instructions.
3606 &DisassembleNVecExtractFrm,
3608 // Vector [Saturating Rounding Doubling] Multiply [Accumulate/Subtract] [Long]
3609 // By Scalar Instructions.
3610 &DisassembleNVecMulScalarFrm,
3612 // Vector Table Lookup uses byte indexes in a control vector to look up byte
3613 // values in a table and generate a new vector.
3614 &DisassembleNVTBLFrm,
3616 &DisassembleDPSoRegImmFrm,
3622 /// BuildIt - BuildIt performs the build step for this ARM Basic MC Builder.
3623 /// The general idea is to set the Opcode for the MCInst, followed by adding
3624 /// the appropriate MCOperands to the MCInst. ARM Basic MC Builder delegates
3625 /// to the Format-specific disassemble function for disassembly, followed by
3626 /// TryPredicateAndSBitModifier() to do PredicateOperand and OptionalDefOperand
3627 /// which follow the Dst/Src Operands.
3628 bool ARMBasicMCBuilder::BuildIt(MCInst &MI, uint32_t insn) {
3629 // Stage 1 sets the Opcode.
3630 MI.setOpcode(Opcode);
3631 // If the number of operands is zero, we're done!
3635 // Stage 2 calls the format-specific disassemble function to build the operand
3639 unsigned NumOpsAdded = 0;
3640 bool OK = (*Disasm)(MI, Opcode, insn, NumOps, NumOpsAdded, this);
3642 if (!OK || this->Err != 0) return false;
3643 if (NumOpsAdded >= NumOps)
3646 // Stage 3 deals with operands unaccounted for after stage 2 is finished.
3647 // FIXME: Should this be done selectively?
3648 return TryPredicateAndSBitModifier(MI, Opcode, insn, NumOps - NumOpsAdded);
3651 // A8.3 Conditional execution
3652 // A8.3.1 Pseudocode details of conditional execution
3653 // Condition bits '111x' indicate the instruction is always executed.
3654 static uint32_t CondCode(uint32_t CondField) {
3655 if (CondField == 0xF)
3660 /// DoPredicateOperands - DoPredicateOperands process the predicate operands
3661 /// of some Thumb instructions which come before the reglist operands. It
3662 /// returns true if the two predicate operands have been processed.
3663 bool ARMBasicMCBuilder::DoPredicateOperands(MCInst& MI, unsigned Opcode,
3664 uint32_t /* insn */, unsigned short NumOpsRemaining) {
3666 assert(NumOpsRemaining > 0 && "Invalid argument");
3668 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3669 unsigned Idx = MI.getNumOperands();
3671 // First, we check whether this instr specifies the PredicateOperand through
3672 // a pair of MCOperandInfos with isPredicate() property.
3673 if (NumOpsRemaining >= 2 &&
3674 OpInfo[Idx].isPredicate() && OpInfo[Idx+1].isPredicate() &&
3675 OpInfo[Idx].RegClass < 0 &&
3676 OpInfo[Idx+1].RegClass == ARM::CCRRegClassID)
3678 // If we are inside an IT block, get the IT condition bits maintained via
3679 // ARMBasicMCBuilder::ITState[7:0], through ARMBasicMCBuilder::GetITCond().
3682 MI.addOperand(MCOperand::CreateImm(GetITCond()));
3684 MI.addOperand(MCOperand::CreateImm(ARMCC::AL));
3685 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
3692 /// TryPredicateAndSBitModifier - TryPredicateAndSBitModifier tries to process
3693 /// the possible Predicate and SBitModifier, to build the remaining MCOperand
3695 bool ARMBasicMCBuilder::TryPredicateAndSBitModifier(MCInst& MI, unsigned Opcode,
3696 uint32_t insn, unsigned short NumOpsRemaining) {
3698 assert(NumOpsRemaining > 0 && "Invalid argument");
3700 const MCOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3701 const std::string &Name = ARMInsts[Opcode].Name;
3702 unsigned Idx = MI.getNumOperands();
3703 uint64_t TSFlags = ARMInsts[Opcode].TSFlags;
3705 // First, we check whether this instr specifies the PredicateOperand through
3706 // a pair of MCOperandInfos with isPredicate() property.
3707 if (NumOpsRemaining >= 2 &&
3708 OpInfo[Idx].isPredicate() && OpInfo[Idx+1].isPredicate() &&
3709 OpInfo[Idx].RegClass < 0 &&
3710 OpInfo[Idx+1].RegClass == ARM::CCRRegClassID)
3712 // If we are inside an IT block, get the IT condition bits maintained via
3713 // ARMBasicMCBuilder::ITState[7:0], through ARMBasicMCBuilder::GetITCond().
3716 MI.addOperand(MCOperand::CreateImm(GetITCond()));
3718 if (Name.length() > 1 && Name[0] == 't') {
3719 // Thumb conditional branch instructions have their cond field embedded,
3723 // Check for undefined encodings.
3725 if (Name == "t2Bcc") {
3726 if ((cond = slice(insn, 25, 22)) >= 14)
3728 MI.addOperand(MCOperand::CreateImm(CondCode(cond)));
3729 } else if (Name == "tBcc") {
3730 if ((cond = slice(insn, 11, 8)) == 14)
3732 MI.addOperand(MCOperand::CreateImm(CondCode(cond)));
3734 MI.addOperand(MCOperand::CreateImm(ARMCC::AL));
3736 // ARM instructions get their condition field from Inst{31-28}.
3737 // We should reject Inst{31-28} = 0b1111 as invalid encoding.
3738 if (!isNEONDomain(TSFlags) && getCondField(insn) == 0xF)
3740 MI.addOperand(MCOperand::CreateImm(CondCode(getCondField(insn))));
3743 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
3745 NumOpsRemaining -= 2;
3748 if (NumOpsRemaining == 0)
3751 // Next, if OptionalDefOperand exists, we check whether the 'S' bit is set.
3752 if (OpInfo[Idx].isOptionalDef() && OpInfo[Idx].RegClass==ARM::CCRRegClassID) {
3753 MI.addOperand(MCOperand::CreateReg(getSBit(insn) == 1 ? ARM::CPSR : 0));
3757 if (NumOpsRemaining == 0)
3763 /// RunBuildAfterHook - RunBuildAfterHook performs operations deemed necessary
3764 /// after BuildIt is finished.
3765 bool ARMBasicMCBuilder::RunBuildAfterHook(bool Status, MCInst &MI,
3768 if (!SP) return Status;
3770 if (Opcode == ARM::t2IT)
3771 Status = SP->InitIT(slice(insn, 7, 0)) ? Status : false;
3772 else if (InITBlock())
3778 /// Opcode, Format, and NumOperands make up an ARM Basic MCBuilder.
3779 ARMBasicMCBuilder::ARMBasicMCBuilder(unsigned opc, ARMFormat format,
3781 : Opcode(opc), Format(format), NumOps(num), SP(0), Err(0) {
3782 unsigned Idx = (unsigned)format;
3783 assert(Idx < (array_lengthof(FuncPtrs) - 1) && "Unknown format");
3784 Disasm = FuncPtrs[Idx];
3787 /// CreateMCBuilder - Return an ARMBasicMCBuilder that can build up the MC
3788 /// infrastructure of an MCInst given the Opcode and Format of the instr.
3789 /// Return NULL if it fails to create/return a proper builder. API clients
3790 /// are responsible for freeing up of the allocated memory. Cacheing can be
3791 /// performed by the API clients to improve performance.
3792 ARMBasicMCBuilder *llvm::CreateMCBuilder(unsigned Opcode, ARMFormat Format) {
3793 // For "Unknown format", fail by returning a NULL pointer.
3794 if ((unsigned)Format >= (array_lengthof(FuncPtrs) - 1)) {
3795 DEBUG(errs() << "Unknown format\n");
3799 return new ARMBasicMCBuilder(Opcode, Format,
3800 ARMInsts[Opcode].getNumOperands());
3803 /// tryAddingSymbolicOperand - tryAddingSymbolicOperand trys to add a symbolic
3804 /// operand in place of the immediate Value in the MCInst. The immediate
3805 /// Value has had any PC adjustment made by the caller. If the getOpInfo()
3806 /// function was set as part of the setupBuilderForSymbolicDisassembly() call
3807 /// then that function is called to get any symbolic information at the
3808 /// builder's Address for this instrution. If that returns non-zero then the
3809 /// symbolic information it returns is used to create an MCExpr and that is
3810 /// added as an operand to the MCInst. This function returns true if it adds
3811 /// an operand to the MCInst and false otherwise.
3812 bool ARMBasicMCBuilder::tryAddingSymbolicOperand(uint64_t Value,
3818 struct LLVMOpInfo1 SymbolicOp;
3819 SymbolicOp.Value = Value;
3820 if (!GetOpInfo(DisInfo, Address, 0 /* Offset */, InstSize, 1, &SymbolicOp))
3823 const MCExpr *Add = NULL;
3824 if (SymbolicOp.AddSymbol.Present) {
3825 if (SymbolicOp.AddSymbol.Name) {
3826 StringRef Name(SymbolicOp.AddSymbol.Name);
3827 MCSymbol *Sym = Ctx->GetOrCreateSymbol(Name);
3828 Add = MCSymbolRefExpr::Create(Sym, *Ctx);
3830 Add = MCConstantExpr::Create(SymbolicOp.AddSymbol.Value, *Ctx);
3834 const MCExpr *Sub = NULL;
3835 if (SymbolicOp.SubtractSymbol.Present) {
3836 if (SymbolicOp.SubtractSymbol.Name) {
3837 StringRef Name(SymbolicOp.SubtractSymbol.Name);
3838 MCSymbol *Sym = Ctx->GetOrCreateSymbol(Name);
3839 Sub = MCSymbolRefExpr::Create(Sym, *Ctx);
3841 Sub = MCConstantExpr::Create(SymbolicOp.SubtractSymbol.Value, *Ctx);
3845 const MCExpr *Off = NULL;
3846 if (SymbolicOp.Value != 0)
3847 Off = MCConstantExpr::Create(SymbolicOp.Value, *Ctx);
3853 LHS = MCBinaryExpr::CreateSub(Add, Sub, *Ctx);
3855 LHS = MCUnaryExpr::CreateMinus(Sub, *Ctx);
3857 Expr = MCBinaryExpr::CreateAdd(LHS, Off, *Ctx);
3862 Expr = MCBinaryExpr::CreateAdd(Add, Off, *Ctx);
3869 Expr = MCConstantExpr::Create(0, *Ctx);
3872 if (SymbolicOp.VariantKind == LLVMDisassembler_VariantKind_ARM_HI16)
3873 MI.addOperand(MCOperand::CreateExpr(ARMMCExpr::CreateUpper16(Expr, *Ctx)));
3874 else if (SymbolicOp.VariantKind == LLVMDisassembler_VariantKind_ARM_LO16)
3875 MI.addOperand(MCOperand::CreateExpr(ARMMCExpr::CreateLower16(Expr, *Ctx)));
3876 else if (SymbolicOp.VariantKind == LLVMDisassembler_VariantKind_None)
3877 MI.addOperand(MCOperand::CreateExpr(Expr));
3879 assert("bad SymbolicOp.VariantKind");