1 //===- ARMDisassemblerCore.cpp - ARM disassembler helpers -------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file is part of the ARM Disassembler.
11 // It contains code to represent the core concepts of Builder and DisassembleFP
12 // to solve the problem of disassembling an ARM instr.
14 //===----------------------------------------------------------------------===//
16 #define DEBUG_TYPE "arm-disassembler"
18 #include "ARMDisassemblerCore.h"
19 #include "ARMAddressingModes.h"
20 #include "llvm/Support/Debug.h"
21 #include "llvm/Support/raw_ostream.h"
23 //#define DEBUG(X) do { X; } while (0)
25 /// ARMGenInstrInfo.inc - ARMGenInstrInfo.inc contains the static const
26 /// TargetInstrDesc ARMInsts[] definition and the TargetOperandInfo[]'s
27 /// describing the operand info for each ARMInsts[i].
29 /// Together with an instruction's encoding format, we can take advantage of the
30 /// NumOperands and the OpInfo fields of the target instruction description in
31 /// the quest to build out the MCOperand list for an MCInst.
33 /// The general guideline is that with a known format, the number of dst and src
34 /// operands are well-known. The dst is built first, followed by the src
35 /// operand(s). The operands not yet used at this point are for the Implicit
36 /// Uses and Defs by this instr. For the Uses part, the pred:$p operand is
37 /// defined with two components:
39 /// def pred { // Operand PredicateOperand
40 /// ValueType Type = OtherVT;
41 /// string PrintMethod = "printPredicateOperand";
42 /// string AsmOperandLowerMethod = ?;
43 /// dag MIOperandInfo = (ops i32imm, CCR);
44 /// AsmOperandClass ParserMatchClass = ImmAsmOperand;
45 /// dag DefaultOps = (ops (i32 14), (i32 zero_reg));
48 /// which is manifested by the TargetOperandInfo[] of:
50 /// { 0, 0|(1<<TOI::Predicate), 0 },
51 /// { ARM::CCRRegClassID, 0|(1<<TOI::Predicate), 0 }
53 /// So the first predicate MCOperand corresponds to the immediate part of the
54 /// ARM condition field (Inst{31-28}), and the second predicate MCOperand
55 /// corresponds to a register kind of ARM::CPSR.
57 /// For the Defs part, in the simple case of only cc_out:$s, we have:
59 /// def cc_out { // Operand OptionalDefOperand
60 /// ValueType Type = OtherVT;
61 /// string PrintMethod = "printSBitModifierOperand";
62 /// string AsmOperandLowerMethod = ?;
63 /// dag MIOperandInfo = (ops CCR);
64 /// AsmOperandClass ParserMatchClass = ImmAsmOperand;
65 /// dag DefaultOps = (ops (i32 zero_reg));
68 /// which is manifested by the one TargetOperandInfo of:
70 /// { ARM::CCRRegClassID, 0|(1<<TOI::OptionalDef), 0 }
72 /// And this maps to one MCOperand with the regsiter kind of ARM::CPSR.
73 #include "ARMGenInstrInfo.inc"
77 const char *ARMUtils::OpcodeName(unsigned Opcode) {
78 return ARMInsts[Opcode].Name;
81 // Return the register enum Based on RegClass and the raw register number.
84 getRegisterEnum(BO B, unsigned RegClassID, unsigned RawRegister) {
85 if (RegClassID == ARM::rGPRRegClassID) {
86 // Check for The register numbers 13 and 15 that are not permitted for many
87 // Thumb register specifiers.
88 if (RawRegister == 13 || RawRegister == 15) {
92 // For this purpose, we can treat rGPR as if it were GPR.
93 RegClassID = ARM::GPRRegClassID;
96 // See also decodeNEONRd(), decodeNEONRn(), decodeNEONRm().
98 RegClassID == ARM::QPRRegClassID ? RawRegister >> 1 : RawRegister;
104 switch (RegClassID) {
105 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R0;
106 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
107 case ARM::DPR_VFP2RegClassID:
109 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
110 case ARM::QPR_VFP2RegClassID:
112 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S0;
116 switch (RegClassID) {
117 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R1;
118 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
119 case ARM::DPR_VFP2RegClassID:
121 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
122 case ARM::QPR_VFP2RegClassID:
124 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S1;
128 switch (RegClassID) {
129 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R2;
130 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
131 case ARM::DPR_VFP2RegClassID:
133 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
134 case ARM::QPR_VFP2RegClassID:
136 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S2;
140 switch (RegClassID) {
141 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R3;
142 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
143 case ARM::DPR_VFP2RegClassID:
145 case ARM::QPRRegClassID: case ARM::QPR_8RegClassID:
146 case ARM::QPR_VFP2RegClassID:
148 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S3;
152 switch (RegClassID) {
153 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R4;
154 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
155 case ARM::DPR_VFP2RegClassID:
157 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q4;
158 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S4;
162 switch (RegClassID) {
163 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R5;
164 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
165 case ARM::DPR_VFP2RegClassID:
167 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q5;
168 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S5;
172 switch (RegClassID) {
173 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R6;
174 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
175 case ARM::DPR_VFP2RegClassID:
177 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q6;
178 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S6;
182 switch (RegClassID) {
183 case ARM::GPRRegClassID: case ARM::tGPRRegClassID: return ARM::R7;
184 case ARM::DPRRegClassID: case ARM::DPR_8RegClassID:
185 case ARM::DPR_VFP2RegClassID:
187 case ARM::QPRRegClassID: case ARM::QPR_VFP2RegClassID: return ARM::Q7;
188 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S7;
192 switch (RegClassID) {
193 case ARM::GPRRegClassID: return ARM::R8;
194 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D8;
195 case ARM::QPRRegClassID: return ARM::Q8;
196 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S8;
200 switch (RegClassID) {
201 case ARM::GPRRegClassID: return ARM::R9;
202 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D9;
203 case ARM::QPRRegClassID: return ARM::Q9;
204 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S9;
208 switch (RegClassID) {
209 case ARM::GPRRegClassID: return ARM::R10;
210 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D10;
211 case ARM::QPRRegClassID: return ARM::Q10;
212 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S10;
216 switch (RegClassID) {
217 case ARM::GPRRegClassID: return ARM::R11;
218 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D11;
219 case ARM::QPRRegClassID: return ARM::Q11;
220 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S11;
224 switch (RegClassID) {
225 case ARM::GPRRegClassID: return ARM::R12;
226 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D12;
227 case ARM::QPRRegClassID: return ARM::Q12;
228 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S12;
232 switch (RegClassID) {
233 case ARM::GPRRegClassID: return ARM::SP;
234 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D13;
235 case ARM::QPRRegClassID: return ARM::Q13;
236 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S13;
240 switch (RegClassID) {
241 case ARM::GPRRegClassID: return ARM::LR;
242 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D14;
243 case ARM::QPRRegClassID: return ARM::Q14;
244 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S14;
248 switch (RegClassID) {
249 case ARM::GPRRegClassID: return ARM::PC;
250 case ARM::DPRRegClassID: case ARM::DPR_VFP2RegClassID: return ARM::D15;
251 case ARM::QPRRegClassID: return ARM::Q15;
252 case ARM::SPRRegClassID: case ARM::SPR_8RegClassID: return ARM::S15;
256 switch (RegClassID) {
257 case ARM::DPRRegClassID: return ARM::D16;
258 case ARM::SPRRegClassID: return ARM::S16;
262 switch (RegClassID) {
263 case ARM::DPRRegClassID: return ARM::D17;
264 case ARM::SPRRegClassID: return ARM::S17;
268 switch (RegClassID) {
269 case ARM::DPRRegClassID: return ARM::D18;
270 case ARM::SPRRegClassID: return ARM::S18;
274 switch (RegClassID) {
275 case ARM::DPRRegClassID: return ARM::D19;
276 case ARM::SPRRegClassID: return ARM::S19;
280 switch (RegClassID) {
281 case ARM::DPRRegClassID: return ARM::D20;
282 case ARM::SPRRegClassID: return ARM::S20;
286 switch (RegClassID) {
287 case ARM::DPRRegClassID: return ARM::D21;
288 case ARM::SPRRegClassID: return ARM::S21;
292 switch (RegClassID) {
293 case ARM::DPRRegClassID: return ARM::D22;
294 case ARM::SPRRegClassID: return ARM::S22;
298 switch (RegClassID) {
299 case ARM::DPRRegClassID: return ARM::D23;
300 case ARM::SPRRegClassID: return ARM::S23;
304 switch (RegClassID) {
305 case ARM::DPRRegClassID: return ARM::D24;
306 case ARM::SPRRegClassID: return ARM::S24;
310 switch (RegClassID) {
311 case ARM::DPRRegClassID: return ARM::D25;
312 case ARM::SPRRegClassID: return ARM::S25;
316 switch (RegClassID) {
317 case ARM::DPRRegClassID: return ARM::D26;
318 case ARM::SPRRegClassID: return ARM::S26;
322 switch (RegClassID) {
323 case ARM::DPRRegClassID: return ARM::D27;
324 case ARM::SPRRegClassID: return ARM::S27;
328 switch (RegClassID) {
329 case ARM::DPRRegClassID: return ARM::D28;
330 case ARM::SPRRegClassID: return ARM::S28;
334 switch (RegClassID) {
335 case ARM::DPRRegClassID: return ARM::D29;
336 case ARM::SPRRegClassID: return ARM::S29;
340 switch (RegClassID) {
341 case ARM::DPRRegClassID: return ARM::D30;
342 case ARM::SPRRegClassID: return ARM::S30;
346 switch (RegClassID) {
347 case ARM::DPRRegClassID: return ARM::D31;
348 case ARM::SPRRegClassID: return ARM::S31;
352 DEBUG(errs() << "Invalid (RegClassID, RawRegister) combination\n");
353 // Encoding error. Mark the builder with error code != 0.
358 ///////////////////////////////
360 // Utility Functions //
362 ///////////////////////////////
364 // Extract/Decode Rd: Inst{15-12}.
365 static inline unsigned decodeRd(uint32_t insn) {
366 return (insn >> ARMII::RegRdShift) & ARMII::GPRRegMask;
369 // Extract/Decode Rn: Inst{19-16}.
370 static inline unsigned decodeRn(uint32_t insn) {
371 return (insn >> ARMII::RegRnShift) & ARMII::GPRRegMask;
374 // Extract/Decode Rm: Inst{3-0}.
375 static inline unsigned decodeRm(uint32_t insn) {
376 return (insn & ARMII::GPRRegMask);
379 // Extract/Decode Rs: Inst{11-8}.
380 static inline unsigned decodeRs(uint32_t insn) {
381 return (insn >> ARMII::RegRsShift) & ARMII::GPRRegMask;
384 static inline unsigned getCondField(uint32_t insn) {
385 return (insn >> ARMII::CondShift);
388 static inline unsigned getIBit(uint32_t insn) {
389 return (insn >> ARMII::I_BitShift) & 1;
392 static inline unsigned getAM3IBit(uint32_t insn) {
393 return (insn >> ARMII::AM3_I_BitShift) & 1;
396 static inline unsigned getPBit(uint32_t insn) {
397 return (insn >> ARMII::P_BitShift) & 1;
400 static inline unsigned getUBit(uint32_t insn) {
401 return (insn >> ARMII::U_BitShift) & 1;
404 static inline unsigned getPUBits(uint32_t insn) {
405 return (insn >> ARMII::U_BitShift) & 3;
408 static inline unsigned getSBit(uint32_t insn) {
409 return (insn >> ARMII::S_BitShift) & 1;
412 static inline unsigned getWBit(uint32_t insn) {
413 return (insn >> ARMII::W_BitShift) & 1;
416 static inline unsigned getDBit(uint32_t insn) {
417 return (insn >> ARMII::D_BitShift) & 1;
420 static inline unsigned getNBit(uint32_t insn) {
421 return (insn >> ARMII::N_BitShift) & 1;
424 static inline unsigned getMBit(uint32_t insn) {
425 return (insn >> ARMII::M_BitShift) & 1;
428 // See A8.4 Shifts applied to a register.
429 // A8.4.2 Register controlled shifts.
431 // getShiftOpcForBits - getShiftOpcForBits translates from the ARM encoding bits
432 // into llvm enums for shift opcode. The API clients should pass in the value
433 // encoded with two bits, so the assert stays to signal a wrong API usage.
435 // A8-12: DecodeRegShift()
436 static inline ARM_AM::ShiftOpc getShiftOpcForBits(unsigned bits) {
438 default: assert(0 && "No such value"); return ARM_AM::no_shift;
439 case 0: return ARM_AM::lsl;
440 case 1: return ARM_AM::lsr;
441 case 2: return ARM_AM::asr;
442 case 3: return ARM_AM::ror;
446 // See A8.4 Shifts applied to a register.
447 // A8.4.1 Constant shifts.
449 // getImmShiftSE - getImmShiftSE translates from the raw ShiftOpc and raw Imm5
450 // encodings into the intended ShiftOpc and shift amount.
452 // A8-11: DecodeImmShift()
453 static inline void getImmShiftSE(ARM_AM::ShiftOpc &ShOp, unsigned &ShImm) {
457 case ARM_AM::no_shift:
461 ShOp = ARM_AM::no_shift;
473 // getAMSubModeForBits - getAMSubModeForBits translates from the ARM encoding
474 // bits Inst{24-23} (P(24) and U(23)) into llvm enums for AMSubMode. The API
475 // clients should pass in the value encoded with two bits, so the assert stays
476 // to signal a wrong API usage.
477 static inline ARM_AM::AMSubMode getAMSubModeForBits(unsigned bits) {
479 default: assert(0 && "No such value"); return ARM_AM::bad_am_submode;
480 case 1: return ARM_AM::ia; // P=0 U=1
481 case 3: return ARM_AM::ib; // P=1 U=1
482 case 0: return ARM_AM::da; // P=0 U=0
483 case 2: return ARM_AM::db; // P=1 U=0
487 ////////////////////////////////////////////
489 // Disassemble function definitions //
491 ////////////////////////////////////////////
493 /// There is a separate Disassemble*Frm function entry for disassembly of an ARM
494 /// instr into a list of MCOperands in the appropriate order, with possible dst,
495 /// followed by possible src(s).
497 /// The processing of the predicate, and the 'S' modifier bit, if MI modifies
498 /// the CPSR, is factored into ARMBasicMCBuilder's method named
499 /// TryPredicateAndSBitModifier.
501 static bool DisassemblePseudo(MCInst &MI, unsigned Opcode, uint32_t insn,
502 unsigned short NumOps, unsigned &NumOpsAdded, BO) {
504 assert(0 && "Unexpected pseudo instruction!");
509 // if d == 15 || n == 15 || m == 15 || a == 15 then UNPREDICTABLE;
512 // if d == 15 || n == 15 || m == 15 then UNPREDICTABLE;
515 // if dLo == 15 || dHi == 15 || n == 15 || m == 15 then UNPREDICTABLE;
516 // if dHi == dLo then UNPREDICTABLE;
517 static bool BadRegsMulFrm(unsigned Opcode, uint32_t insn) {
518 unsigned R19_16 = slice(insn, 19, 16);
519 unsigned R15_12 = slice(insn, 15, 12);
520 unsigned R11_8 = slice(insn, 11, 8);
521 unsigned R3_0 = slice(insn, 3, 0);
524 // Did we miss an opcode?
525 assert(0 && "Unexpected opcode!");
527 case ARM::MLA: case ARM::MLS: case ARM::SMLABB: case ARM::SMLABT:
528 case ARM::SMLATB: case ARM::SMLATT: case ARM::SMLAWB: case ARM::SMLAWT:
529 case ARM::SMMLA: case ARM::SMMLS: case ARM::SMLSD: case ARM::SMLSDX:
530 if (R19_16 == 15 || R15_12 == 15 || R11_8 == 15 || R3_0 == 15)
533 case ARM::MUL: case ARM::SMMUL: case ARM::SMULBB: case ARM::SMULBT:
534 case ARM::SMULTB: case ARM::SMULTT: case ARM::SMULWB: case ARM::SMULWT:
535 if (R19_16 == 15 || R11_8 == 15 || R3_0 == 15)
538 case ARM::SMLAL: case ARM::SMULL: case ARM::UMAAL: case ARM::UMLAL:
539 case ARM::UMULL: case ARM::SMLALBB: case ARM::SMLALBT: case ARM::SMLALTB:
540 case ARM::SMLALTT: case ARM::SMLSLD:
541 if (R19_16 == 15 || R15_12 == 15 || R11_8 == 15 || R3_0 == 15)
543 if (R19_16 == R15_12)
549 // Multiply Instructions.
550 // MLA, MLS, SMLABB, SMLABT, SMLATB, SMLATT, SMLAWB, SMLAWT, SMMLA, SMMLS,
552 // Rd{19-16} Rn{3-0} Rm{11-8} Ra{15-12}
554 // MUL, SMMUL, SMULBB, SMULBT, SMULTB, SMULTT, SMULWB, SMULWT:
555 // Rd{19-16} Rn{3-0} Rm{11-8}
557 // SMLAL, SMULL, UMAAL, UMLAL, UMULL, SMLALBB, SMLALBT, SMLALTB, SMLALTT,
559 // RdLo{15-12} RdHi{19-16} Rn{3-0} Rm{11-8}
561 // The mapping of the multiply registers to the "regular" ARM registers, where
562 // there are convenience decoder functions, is:
568 static bool DisassembleMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
569 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
571 const TargetInstrDesc &TID = ARMInsts[Opcode];
572 unsigned short NumDefs = TID.getNumDefs();
573 const TargetOperandInfo *OpInfo = TID.OpInfo;
574 unsigned &OpIdx = NumOpsAdded;
578 assert(NumDefs > 0 && "NumDefs should be greater than 0 for MulFrm");
580 && OpInfo[0].RegClass == ARM::GPRRegClassID
581 && OpInfo[1].RegClass == ARM::GPRRegClassID
582 && OpInfo[2].RegClass == ARM::GPRRegClassID
583 && "Expect three register operands");
585 // Sanity check for the register encodings.
586 if (BadRegsMulFrm(Opcode, insn))
589 // Instructions with two destination registers have RdLo{15-12} first.
591 assert(NumOps >= 4 && OpInfo[3].RegClass == ARM::GPRRegClassID &&
592 "Expect 4th register operand");
593 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
598 // The destination register: RdHi{19-16} or Rd{19-16}.
599 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
602 // The two src regsiters: Rn{3-0}, then Rm{11-8}.
603 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
605 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
609 // Many multiply instructions (e.g., MLA) have three src registers.
610 // The third register operand is Ra{15-12}.
611 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) {
612 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
620 // Helper routines for disassembly of coprocessor instructions.
622 static bool LdStCopOpcode(unsigned Opcode) {
623 if ((Opcode >= ARM::LDC2L_OFFSET && Opcode <= ARM::LDC_PRE) ||
624 (Opcode >= ARM::STC2L_OFFSET && Opcode <= ARM::STC_PRE))
628 static bool CoprocessorOpcode(unsigned Opcode) {
629 if (LdStCopOpcode(Opcode))
635 case ARM::CDP: case ARM::CDP2:
636 case ARM::MCR: case ARM::MCR2: case ARM::MRC: case ARM::MRC2:
637 case ARM::MCRR: case ARM::MCRR2: case ARM::MRRC: case ARM::MRRC2:
641 static inline unsigned GetCoprocessor(uint32_t insn) {
642 return slice(insn, 11, 8);
644 static inline unsigned GetCopOpc1(uint32_t insn, bool CDP) {
645 return CDP ? slice(insn, 23, 20) : slice(insn, 23, 21);
647 static inline unsigned GetCopOpc2(uint32_t insn) {
648 return slice(insn, 7, 5);
650 static inline unsigned GetCopOpc(uint32_t insn) {
651 return slice(insn, 7, 4);
653 // Most of the operands are in immediate forms, except Rd and Rn, which are ARM
656 // CDP, CDP2: cop opc1 CRd CRn CRm opc2
658 // MCR, MCR2, MRC, MRC2: cop opc1 Rd CRn CRm opc2
660 // MCRR, MCRR2, MRRC, MRRc2: cop opc Rd Rn CRm
662 // LDC_OFFSET, LDC_PRE, LDC_POST: cop CRd Rn R0 [+/-]imm8:00
664 // STC_OFFSET, STC_PRE, STC_POST: cop CRd Rn R0 [+/-]imm8:00
668 // LDC_OPTION: cop CRd Rn imm8
670 // STC_OPTION: cop CRd Rn imm8
673 static bool DisassembleCoprocessor(MCInst &MI, unsigned Opcode, uint32_t insn,
674 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
676 assert(NumOps >= 4 && "Num of operands >= 4 for coprocessor instr");
678 unsigned &OpIdx = NumOpsAdded;
679 bool OneCopOpc = (Opcode == ARM::MCRR || Opcode == ARM::MCRR2 ||
680 Opcode == ARM::MRRC || Opcode == ARM::MRRC2);
681 // CDP/CDP2 has no GPR operand; the opc1 operand is also wider (Inst{23-20}).
682 bool NoGPR = (Opcode == ARM::CDP || Opcode == ARM::CDP2);
683 bool LdStCop = LdStCopOpcode(Opcode);
687 MI.addOperand(MCOperand::CreateImm(GetCoprocessor(insn)));
690 // Unindex if P:W = 0b00 --> _OPTION variant
691 unsigned PW = getPBit(insn) << 1 | getWBit(insn);
693 MI.addOperand(MCOperand::CreateImm(decodeRd(insn)));
695 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
699 MI.addOperand(MCOperand::CreateReg(0));
700 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
701 const TargetInstrDesc &TID = ARMInsts[Opcode];
703 (TID.TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift;
704 unsigned Offset = ARM_AM::getAM2Opc(AddrOpcode, slice(insn, 7, 0) << 2,
705 ARM_AM::no_shift, IndexMode);
706 MI.addOperand(MCOperand::CreateImm(Offset));
709 MI.addOperand(MCOperand::CreateImm(slice(insn, 7, 0)));
713 MI.addOperand(MCOperand::CreateImm(OneCopOpc ? GetCopOpc(insn)
714 : GetCopOpc1(insn, NoGPR)));
716 MI.addOperand(NoGPR ? MCOperand::CreateImm(decodeRd(insn))
717 : MCOperand::CreateReg(
718 getRegisterEnum(B, ARM::GPRRegClassID,
721 MI.addOperand(OneCopOpc ? MCOperand::CreateReg(
722 getRegisterEnum(B, ARM::GPRRegClassID,
724 : MCOperand::CreateImm(decodeRn(insn)));
726 MI.addOperand(MCOperand::CreateImm(decodeRm(insn)));
731 MI.addOperand(MCOperand::CreateImm(GetCopOpc2(insn)));
739 // Branch Instructions.
740 // BL: SignExtend(Imm24:'00', 32)
741 // Bcc, BL_pred: SignExtend(Imm24:'00', 32) Pred0 Pred1
742 // SMC: ZeroExtend(imm4, 32)
743 // SVC: ZeroExtend(Imm24, 32)
745 // Various coprocessor instructions are assigned BrFrm arbitrarily.
746 // Delegates to DisassembleCoprocessor() helper function.
749 // MSR/MSRsys: Rm mask=Inst{19-16}
751 // MSRi/MSRsysi: so_imm
752 // SRSW/SRS: ldstm_mode:$amode mode_imm
753 // RFEW/RFE: ldstm_mode:$amode Rn
754 static bool DisassembleBrFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
755 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
757 if (CoprocessorOpcode(Opcode))
758 return DisassembleCoprocessor(MI, Opcode, insn, NumOps, NumOpsAdded, B);
760 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
761 if (!OpInfo) return false;
763 // MRS and MRSsys take one GPR reg Rd.
764 if (Opcode == ARM::MRS || Opcode == ARM::MRSsys) {
765 assert(NumOps >= 1 && OpInfo[0].RegClass == ARM::GPRRegClassID &&
766 "Reg operand expected");
767 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
772 // BXJ takes one GPR reg Rm.
773 if (Opcode == ARM::BXJ) {
774 assert(NumOps >= 1 && OpInfo[0].RegClass == ARM::GPRRegClassID &&
775 "Reg operand expected");
776 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
781 // MSR take a mask, followed by one GPR reg Rm. The mask contains the R Bit in
782 // bit 4, and the special register fields in bits 3-0.
783 if (Opcode == ARM::MSR) {
784 assert(NumOps >= 1 && OpInfo[1].RegClass == ARM::GPRRegClassID &&
785 "Reg operand expected");
786 MI.addOperand(MCOperand::CreateImm(slice(insn, 22, 22) << 4 /* R Bit */ |
787 slice(insn, 19, 16) /* Special Reg */ ));
788 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
793 // MSRi take a mask, followed by one so_imm operand. The mask contains the
794 // R Bit in bit 4, and the special register fields in bits 3-0.
795 if (Opcode == ARM::MSRi) {
796 MI.addOperand(MCOperand::CreateImm(slice(insn, 22, 22) << 4 /* R Bit */ |
797 slice(insn, 19, 16) /* Special Reg */ ));
798 // SOImm is 4-bit rotate amount in bits 11-8 with 8-bit imm in bits 7-0.
799 // A5.2.4 Rotate amount is twice the numeric value of Inst{11-8}.
800 // See also ARMAddressingModes.h: getSOImmValImm() and getSOImmValRot().
801 unsigned Rot = (insn >> ARMII::SoRotImmShift) & 0xF;
802 unsigned Imm = insn & 0xFF;
803 MI.addOperand(MCOperand::CreateImm(ARM_AM::rotr32(Imm, 2*Rot)));
807 if (Opcode == ARM::SRSW || Opcode == ARM::SRS ||
808 Opcode == ARM::RFEW || Opcode == ARM::RFE) {
809 ARM_AM::AMSubMode SubMode = getAMSubModeForBits(getPUBits(insn));
810 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM4ModeImm(SubMode)));
812 if (Opcode == ARM::SRSW || Opcode == ARM::SRS)
813 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0)));
815 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
821 assert((Opcode == ARM::Bcc || Opcode == ARM::BL || Opcode == ARM::BL_pred
822 || Opcode == ARM::SMC || Opcode == ARM::SVC) &&
823 "Unexpected Opcode");
825 assert(NumOps >= 1 && OpInfo[0].RegClass < 0 && "Imm operand expected");
828 if (Opcode == ARM::SMC) {
829 // ZeroExtend(imm4, 32) where imm24 = Inst{3-0}.
830 Imm32 = slice(insn, 3, 0);
831 } else if (Opcode == ARM::SVC) {
832 // ZeroExtend(imm24, 32) where imm24 = Inst{23-0}.
833 Imm32 = slice(insn, 23, 0);
835 // SignExtend(imm24:'00', 32) where imm24 = Inst{23-0}.
836 unsigned Imm26 = slice(insn, 23, 0) << 2;
837 //Imm32 = signextend<signed int, 26>(Imm26);
838 Imm32 = SignExtend32<26>(Imm26);
841 MI.addOperand(MCOperand::CreateImm(Imm32));
847 // Misc. Branch Instructions.
850 static bool DisassembleBrMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
851 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
853 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
854 if (!OpInfo) return false;
856 unsigned &OpIdx = NumOpsAdded;
860 // BX_RET and MOVPCLR have only two predicate operands; do an early return.
861 if (Opcode == ARM::BX_RET || Opcode == ARM::MOVPCLR)
864 // BLX and BX take one GPR reg.
865 if (Opcode == ARM::BLX || Opcode == ARM::BLX_pred ||
867 assert(NumOps >= 1 && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
868 "Reg operand expected");
869 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
875 // BLXi takes imm32 (the PC offset).
876 if (Opcode == ARM::BLXi) {
877 assert(NumOps >= 1 && OpInfo[0].RegClass < 0 && "Imm operand expected");
878 // SignExtend(imm24:H:'0', 32) where imm24 = Inst{23-0} and H = Inst{24}.
879 unsigned Imm26 = slice(insn, 23, 0) << 2 | slice(insn, 24, 24) << 1;
880 int Imm32 = SignExtend32<26>(Imm26);
881 MI.addOperand(MCOperand::CreateImm(Imm32));
889 static inline bool getBFCInvMask(uint32_t insn, uint32_t &mask) {
890 uint32_t lsb = slice(insn, 11, 7);
891 uint32_t msb = slice(insn, 20, 16);
894 DEBUG(errs() << "Encoding error: msb < lsb\n");
898 for (uint32_t i = lsb; i <= msb; ++i)
904 // A major complication is the fact that some of the saturating add/subtract
905 // operations have Rd Rm Rn, instead of the "normal" Rd Rn Rm.
906 // They are QADD, QDADD, QDSUB, and QSUB.
907 static bool DisassembleDPFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
908 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
910 const TargetInstrDesc &TID = ARMInsts[Opcode];
911 unsigned short NumDefs = TID.getNumDefs();
912 bool isUnary = isUnaryDP(TID.TSFlags);
913 const TargetOperandInfo *OpInfo = TID.OpInfo;
914 unsigned &OpIdx = NumOpsAdded;
918 // Disassemble register def if there is one.
919 if (NumDefs && (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID)) {
920 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
925 // Now disassemble the src operands.
929 // Special-case handling of BFC/BFI/SBFX/UBFX.
930 if (Opcode == ARM::BFC || Opcode == ARM::BFI) {
931 MI.addOperand(MCOperand::CreateReg(0));
932 if (Opcode == ARM::BFI) {
933 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
938 if (!getBFCInvMask(insn, mask))
941 MI.addOperand(MCOperand::CreateImm(mask));
945 if (Opcode == ARM::SBFX || Opcode == ARM::UBFX) {
946 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
948 MI.addOperand(MCOperand::CreateImm(slice(insn, 11, 7)));
949 MI.addOperand(MCOperand::CreateImm(slice(insn, 20, 16) + 1));
954 bool RmRn = (Opcode == ARM::QADD || Opcode == ARM::QDADD ||
955 Opcode == ARM::QDSUB || Opcode == ARM::QSUB);
957 // BinaryDP has an Rn operand.
959 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
960 "Reg operand expected");
961 MI.addOperand(MCOperand::CreateReg(
962 getRegisterEnum(B, ARM::GPRRegClassID,
963 RmRn ? decodeRm(insn) : decodeRn(insn))));
967 // If this is a two-address operand, skip it, e.g., MOVCCr operand 1.
968 if (isUnary && (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)) {
969 MI.addOperand(MCOperand::CreateReg(0));
973 // Now disassemble operand 2.
977 if (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) {
978 // We have a reg/reg form.
979 // Assert disabled because saturating operations, e.g., A8.6.127 QASX, are
980 // routed here as well.
981 // assert(getIBit(insn) == 0 && "I_Bit != '0' reg/reg form");
982 MI.addOperand(MCOperand::CreateReg(
983 getRegisterEnum(B, ARM::GPRRegClassID,
984 RmRn? decodeRn(insn) : decodeRm(insn))));
986 } else if (Opcode == ARM::MOVi16 || Opcode == ARM::MOVTi16) {
987 // We have an imm16 = imm4:imm12 (imm4=Inst{19:16}, imm12 = Inst{11:0}).
988 assert(getIBit(insn) == 1 && "I_Bit != '1' reg/imm form");
989 unsigned Imm16 = slice(insn, 19, 16) << 12 | slice(insn, 11, 0);
990 MI.addOperand(MCOperand::CreateImm(Imm16));
993 // We have a reg/imm form.
994 // SOImm is 4-bit rotate amount in bits 11-8 with 8-bit imm in bits 7-0.
995 // A5.2.4 Rotate amount is twice the numeric value of Inst{11-8}.
996 // See also ARMAddressingModes.h: getSOImmValImm() and getSOImmValRot().
997 assert(getIBit(insn) == 1 && "I_Bit != '1' reg/imm form");
998 unsigned Rot = (insn >> ARMII::SoRotImmShift) & 0xF;
999 unsigned Imm = insn & 0xFF;
1000 MI.addOperand(MCOperand::CreateImm(ARM_AM::rotr32(Imm, 2*Rot)));
1007 static bool DisassembleDPSoRegFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1008 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1010 const TargetInstrDesc &TID = ARMInsts[Opcode];
1011 unsigned short NumDefs = TID.getNumDefs();
1012 bool isUnary = isUnaryDP(TID.TSFlags);
1013 const TargetOperandInfo *OpInfo = TID.OpInfo;
1014 unsigned &OpIdx = NumOpsAdded;
1018 // Disassemble register def if there is one.
1019 if (NumDefs && (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID)) {
1020 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1025 // Disassemble the src operands.
1026 if (OpIdx >= NumOps)
1029 // BinaryDP has an Rn operand.
1031 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1032 "Reg operand expected");
1033 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1038 // If this is a two-address operand, skip it, e.g., MOVCCs operand 1.
1039 if (isUnary && (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)) {
1040 MI.addOperand(MCOperand::CreateReg(0));
1044 // Disassemble operand 2, which consists of three components.
1045 if (OpIdx + 2 >= NumOps)
1048 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
1049 (OpInfo[OpIdx+1].RegClass == ARM::GPRRegClassID) &&
1050 (OpInfo[OpIdx+2].RegClass < 0) &&
1051 "Expect 3 reg operands");
1053 // Register-controlled shifts have Inst{7} = 0 and Inst{4} = 1.
1054 unsigned Rs = slice(insn, 4, 4);
1056 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1059 // Register-controlled shifts: [Rm, Rs, shift].
1060 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1062 // Inst{6-5} encodes the shift opcode.
1063 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1064 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(ShOp, 0)));
1066 // Constant shifts: [Rm, reg0, shift_imm].
1067 MI.addOperand(MCOperand::CreateReg(0)); // NoRegister
1068 // Inst{6-5} encodes the shift opcode.
1069 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1070 // Inst{11-7} encodes the imm5 shift amount.
1071 unsigned ShImm = slice(insn, 11, 7);
1073 // A8.4.1. Possible rrx or shift amount of 32...
1074 getImmShiftSE(ShOp, ShImm);
1075 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(ShOp, ShImm)));
1082 static bool DisassembleLdStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1083 unsigned short NumOps, unsigned &NumOpsAdded, bool isStore, BO B) {
1085 const TargetInstrDesc &TID = ARMInsts[Opcode];
1086 bool isPrePost = isPrePostLdSt(TID.TSFlags);
1087 const TargetOperandInfo *OpInfo = TID.OpInfo;
1088 if (!OpInfo) return false;
1090 unsigned &OpIdx = NumOpsAdded;
1094 assert(((!isStore && TID.getNumDefs() > 0) ||
1095 (isStore && (TID.getNumDefs() == 0 || isPrePost)))
1096 && "Invalid arguments");
1098 // Operand 0 of a pre- and post-indexed store is the address base writeback.
1099 if (isPrePost && isStore) {
1100 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1101 "Reg operand expected");
1102 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1107 // Disassemble the dst/src operand.
1108 if (OpIdx >= NumOps)
1111 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1112 "Reg operand expected");
1113 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1117 // After dst of a pre- and post-indexed load is the address base writeback.
1118 if (isPrePost && !isStore) {
1119 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1120 "Reg operand expected");
1121 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1126 // Disassemble the base operand.
1127 if (OpIdx >= NumOps)
1130 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1131 "Reg operand expected");
1132 assert((!isPrePost || (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1))
1133 && "Index mode or tied_to operand expected");
1134 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1138 // For reg/reg form, base reg is followed by +/- reg shop imm.
1139 // For immediate form, it is followed by +/- imm12.
1140 // See also ARMAddressingModes.h (Addressing Mode #2).
1141 if (OpIdx + 1 >= NumOps)
1144 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1145 unsigned IndexMode =
1146 (TID.TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift;
1147 if (getIBit(insn) == 0) {
1148 // For pre- and post-indexed case, add a reg0 operand (Addressing Mode #2).
1149 // Otherwise, skip the reg operand since for addrmode_imm12, Rn has already
1152 MI.addOperand(MCOperand::CreateReg(0));
1156 unsigned Imm12 = slice(insn, 11, 0);
1157 if (Opcode == ARM::LDRBi12 || Opcode == ARM::LDRi12 ||
1158 Opcode == ARM::STRBi12 || Opcode == ARM::STRi12) {
1159 // Disassemble the 12-bit immediate offset, which is the second operand in
1160 // $addrmode_imm12 => (ops GPR:$base, i32imm:$offsimm).
1161 int Offset = AddrOpcode == ARM_AM::add ? 1 * Imm12 : -1 * Imm12;
1162 MI.addOperand(MCOperand::CreateImm(Offset));
1164 // Disassemble the 12-bit immediate offset, which is the second operand in
1165 // $am2offset => (ops GPR, i32imm).
1166 unsigned Offset = ARM_AM::getAM2Opc(AddrOpcode, Imm12, ARM_AM::no_shift,
1168 MI.addOperand(MCOperand::CreateImm(Offset));
1172 // The opcode ARM::LDRT actually corresponds to both Encoding A1 and A2 of
1173 // A8.6.86 LDRT. So if Inst{4} != 0 while Inst{25} (getIBit(insn)) == 1,
1174 // we should reject this insn as invalid.
1177 if ((Opcode == ARM::LDRT || Opcode == ARM::LDRBT) && (slice(insn,4,4) == 1))
1180 // Disassemble the offset reg (Rm), shift type, and immediate shift length.
1181 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1183 // Inst{6-5} encodes the shift opcode.
1184 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1185 // Inst{11-7} encodes the imm5 shift amount.
1186 unsigned ShImm = slice(insn, 11, 7);
1188 // A8.4.1. Possible rrx or shift amount of 32...
1189 getImmShiftSE(ShOp, ShImm);
1190 MI.addOperand(MCOperand::CreateImm(
1191 ARM_AM::getAM2Opc(AddrOpcode, ShImm, ShOp, IndexMode)));
1198 static bool DisassembleLdFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1199 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1200 return DisassembleLdStFrm(MI, Opcode, insn, NumOps, NumOpsAdded, false, B);
1203 static bool DisassembleStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1204 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1205 return DisassembleLdStFrm(MI, Opcode, insn, NumOps, NumOpsAdded, true, B);
1208 static bool HasDualReg(unsigned Opcode) {
1212 case ARM::LDRD: case ARM::LDRD_PRE: case ARM::LDRD_POST:
1213 case ARM::STRD: case ARM::STRD_PRE: case ARM::STRD_POST:
1218 static bool DisassembleLdStMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1219 unsigned short NumOps, unsigned &NumOpsAdded, bool isStore, BO B) {
1221 const TargetInstrDesc &TID = ARMInsts[Opcode];
1222 bool isPrePost = isPrePostLdSt(TID.TSFlags);
1223 const TargetOperandInfo *OpInfo = TID.OpInfo;
1224 if (!OpInfo) return false;
1226 unsigned &OpIdx = NumOpsAdded;
1230 assert(((!isStore && TID.getNumDefs() > 0) ||
1231 (isStore && (TID.getNumDefs() == 0 || isPrePost)))
1232 && "Invalid arguments");
1234 // Operand 0 of a pre- and post-indexed store is the address base writeback.
1235 if (isPrePost && isStore) {
1236 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1237 "Reg operand expected");
1238 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1243 // Disassemble the dst/src operand.
1244 if (OpIdx >= NumOps)
1247 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1248 "Reg operand expected");
1249 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1253 // Fill in LDRD and STRD's second operand Rt operand.
1254 if (HasDualReg(Opcode)) {
1255 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1256 decodeRd(insn) + 1)));
1260 // After dst of a pre- and post-indexed load is the address base writeback.
1261 if (isPrePost && !isStore) {
1262 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1263 "Reg operand expected");
1264 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1269 // Disassemble the base operand.
1270 if (OpIdx >= NumOps)
1273 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1274 "Reg operand expected");
1275 assert((!isPrePost || (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1))
1276 && "Offset mode or tied_to operand expected");
1277 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1281 // For reg/reg form, base reg is followed by +/- reg.
1282 // For immediate form, it is followed by +/- imm8.
1283 // See also ARMAddressingModes.h (Addressing Mode #3).
1284 if (OpIdx + 1 >= NumOps)
1287 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
1288 (OpInfo[OpIdx+1].RegClass < 0) &&
1289 "Expect 1 reg operand followed by 1 imm operand");
1291 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1292 unsigned IndexMode =
1293 (TID.TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift;
1294 if (getAM3IBit(insn) == 1) {
1295 MI.addOperand(MCOperand::CreateReg(0));
1297 // Disassemble the 8-bit immediate offset.
1298 unsigned Imm4H = (insn >> ARMII::ImmHiShift) & 0xF;
1299 unsigned Imm4L = insn & 0xF;
1300 unsigned Offset = ARM_AM::getAM3Opc(AddrOpcode, (Imm4H << 4) | Imm4L,
1302 MI.addOperand(MCOperand::CreateImm(Offset));
1304 // Disassemble the offset reg (Rm).
1305 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1307 unsigned Offset = ARM_AM::getAM3Opc(AddrOpcode, 0, IndexMode);
1308 MI.addOperand(MCOperand::CreateImm(Offset));
1315 static bool DisassembleLdMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1316 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1317 return DisassembleLdStMiscFrm(MI, Opcode, insn, NumOps, NumOpsAdded, false,
1321 static bool DisassembleStMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1322 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1323 return DisassembleLdStMiscFrm(MI, Opcode, insn, NumOps, NumOpsAdded, true, B);
1326 // The algorithm for disassembly of LdStMulFrm is different from others because
1327 // it explicitly populates the two predicate operands after the base register.
1328 // After that, we need to populate the reglist with each affected register
1329 // encoded as an MCOperand.
1330 static bool DisassembleLdStMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1331 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1333 assert(NumOps >= 4 && "LdStMulFrm expects NumOps >= 4");
1336 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1338 // Writeback to base, if necessary.
1339 if (Opcode == ARM::LDMIA_UPD || Opcode == ARM::STMIA_UPD ||
1340 Opcode == ARM::LDMDA_UPD || Opcode == ARM::STMDA_UPD ||
1341 Opcode == ARM::LDMDB_UPD || Opcode == ARM::STMDB_UPD ||
1342 Opcode == ARM::LDMIB_UPD || Opcode == ARM::STMIB_UPD) {
1343 MI.addOperand(MCOperand::CreateReg(Base));
1347 // Add the base register operand.
1348 MI.addOperand(MCOperand::CreateReg(Base));
1350 // Handling the two predicate operands before the reglist.
1351 int64_t CondVal = getCondField(insn);
1354 MI.addOperand(MCOperand::CreateImm(CondVal));
1355 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
1359 // Fill the variadic part of reglist.
1360 unsigned RegListBits = insn & ((1 << 16) - 1);
1361 for (unsigned i = 0; i < 16; ++i) {
1362 if ((RegListBits >> i) & 1) {
1363 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1372 // LDREX, LDREXB, LDREXH: Rd Rn
1373 // LDREXD: Rd Rd+1 Rn
1374 // STREX, STREXB, STREXH: Rd Rm Rn
1375 // STREXD: Rd Rm Rm+1 Rn
1377 // SWP, SWPB: Rd Rm Rn
1378 static bool DisassembleLdStExFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1379 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1381 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1382 if (!OpInfo) return false;
1384 unsigned &OpIdx = NumOpsAdded;
1389 && OpInfo[0].RegClass == ARM::GPRRegClassID
1390 && OpInfo[1].RegClass == ARM::GPRRegClassID
1391 && "Expect 2 reg operands");
1393 bool isStore = slice(insn, 20, 20) == 0;
1394 bool isDW = (Opcode == ARM::LDREXD || Opcode == ARM::STREXD);
1396 // Add the destination operand.
1397 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1401 // Store register Exclusive needs a source operand.
1403 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1408 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1409 decodeRm(insn)+1)));
1413 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1414 decodeRd(insn)+1)));
1418 // Finally add the pointer operand.
1419 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1426 // Misc. Arithmetic Instructions.
1428 // PKHBT, PKHTB: Rd Rn Rm , LSL/ASR #imm5
1429 // RBIT, REV, REV16, REVSH: Rd Rm
1430 static bool DisassembleArithMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1431 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1433 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1434 unsigned &OpIdx = NumOpsAdded;
1439 && OpInfo[0].RegClass == ARM::GPRRegClassID
1440 && OpInfo[1].RegClass == ARM::GPRRegClassID
1441 && "Expect 2 reg operands");
1443 bool ThreeReg = NumOps > 2 && OpInfo[2].RegClass == ARM::GPRRegClassID;
1445 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1450 assert(NumOps >= 4 && "Expect >= 4 operands");
1451 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1456 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1460 // If there is still an operand info left which is an immediate operand, add
1461 // an additional imm5 LSL/ASR operand.
1462 if (ThreeReg && OpInfo[OpIdx].RegClass < 0
1463 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1464 // Extract the 5-bit immediate field Inst{11-7}.
1465 unsigned ShiftAmt = (insn >> ARMII::ShiftShift) & 0x1F;
1466 ARM_AM::ShiftOpc Opc = ARM_AM::no_shift;
1467 if (Opcode == ARM::PKHBT)
1469 else if (Opcode == ARM::PKHBT)
1471 getImmShiftSE(Opc, ShiftAmt);
1472 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(Opc, ShiftAmt)));
1479 /// DisassembleSatFrm - Disassemble saturate instructions:
1480 /// SSAT, SSAT16, USAT, and USAT16.
1481 static bool DisassembleSatFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1482 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1484 const TargetInstrDesc &TID = ARMInsts[Opcode];
1485 NumOpsAdded = TID.getNumOperands() - 2; // ignore predicate operands
1487 // Disassemble register def.
1488 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1491 unsigned Pos = slice(insn, 20, 16);
1492 if (Opcode == ARM::SSAT || Opcode == ARM::SSAT16)
1494 MI.addOperand(MCOperand::CreateImm(Pos));
1496 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1499 if (NumOpsAdded == 4) {
1500 ARM_AM::ShiftOpc Opc = (slice(insn, 6, 6) != 0 ? ARM_AM::asr : ARM_AM::lsl);
1501 // Inst{11-7} encodes the imm5 shift amount.
1502 unsigned ShAmt = slice(insn, 11, 7);
1504 // A8.6.183. Possible ASR shift amount of 32...
1505 if (Opc == ARM_AM::asr)
1508 Opc = ARM_AM::no_shift;
1510 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(Opc, ShAmt)));
1515 // Extend instructions.
1516 // SXT* and UXT*: Rd [Rn] Rm [rot_imm].
1517 // The 2nd operand register is Rn and the 3rd operand regsiter is Rm for the
1518 // three register operand form. Otherwise, Rn=0b1111 and only Rm is used.
1519 static bool DisassembleExtFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1520 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1522 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1523 unsigned &OpIdx = NumOpsAdded;
1528 && OpInfo[0].RegClass == ARM::GPRRegClassID
1529 && OpInfo[1].RegClass == ARM::GPRRegClassID
1530 && "Expect 2 reg operands");
1532 bool ThreeReg = NumOps > 2 && OpInfo[2].RegClass == ARM::GPRRegClassID;
1534 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1539 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1544 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1548 // If there is still an operand info left which is an immediate operand, add
1549 // an additional rotate immediate operand.
1550 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
1551 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1552 // Extract the 2-bit rotate field Inst{11-10}.
1553 unsigned rot = (insn >> ARMII::ExtRotImmShift) & 3;
1554 // Rotation by 8, 16, or 24 bits.
1555 MI.addOperand(MCOperand::CreateImm(rot << 3));
1562 /////////////////////////////////////
1564 // Utility Functions For VFP //
1566 /////////////////////////////////////
1568 // Extract/Decode Dd/Sd:
1570 // SP => d = UInt(Vd:D)
1571 // DP => d = UInt(D:Vd)
1572 static unsigned decodeVFPRd(uint32_t insn, bool isSPVFP) {
1573 return isSPVFP ? (decodeRd(insn) << 1 | getDBit(insn))
1574 : (decodeRd(insn) | getDBit(insn) << 4);
1577 // Extract/Decode Dn/Sn:
1579 // SP => n = UInt(Vn:N)
1580 // DP => n = UInt(N:Vn)
1581 static unsigned decodeVFPRn(uint32_t insn, bool isSPVFP) {
1582 return isSPVFP ? (decodeRn(insn) << 1 | getNBit(insn))
1583 : (decodeRn(insn) | getNBit(insn) << 4);
1586 // Extract/Decode Dm/Sm:
1588 // SP => m = UInt(Vm:M)
1589 // DP => m = UInt(M:Vm)
1590 static unsigned decodeVFPRm(uint32_t insn, bool isSPVFP) {
1591 return isSPVFP ? (decodeRm(insn) << 1 | getMBit(insn))
1592 : (decodeRm(insn) | getMBit(insn) << 4);
1596 static APInt VFPExpandImm(unsigned char byte, unsigned N) {
1597 assert(N == 32 || N == 64);
1600 unsigned bit6 = slice(byte, 6, 6);
1602 Result = slice(byte, 7, 7) << 31 | slice(byte, 5, 0) << 19;
1604 Result |= 0x1f << 25;
1606 Result |= 0x1 << 30;
1608 Result = (uint64_t)slice(byte, 7, 7) << 63 |
1609 (uint64_t)slice(byte, 5, 0) << 48;
1611 Result |= 0xffULL << 54;
1613 Result |= 0x1ULL << 62;
1615 return APInt(N, Result);
1618 // VFP Unary Format Instructions:
1620 // VCMP[E]ZD, VCMP[E]ZS: compares one floating-point register with zero
1621 // VCVTDS, VCVTSD: converts between double-precision and single-precision
1622 // The rest of the instructions have homogeneous [VFP]Rd and [VFP]Rm registers.
1623 static bool DisassembleVFPUnaryFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1624 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1626 assert(NumOps >= 1 && "VFPUnaryFrm expects NumOps >= 1");
1628 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1629 unsigned &OpIdx = NumOpsAdded;
1633 unsigned RegClass = OpInfo[OpIdx].RegClass;
1634 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1635 "Reg operand expected");
1636 bool isSP = (RegClass == ARM::SPRRegClassID);
1638 MI.addOperand(MCOperand::CreateReg(
1639 getRegisterEnum(B, RegClass, decodeVFPRd(insn, isSP))));
1642 // Early return for compare with zero instructions.
1643 if (Opcode == ARM::VCMPEZD || Opcode == ARM::VCMPEZS
1644 || Opcode == ARM::VCMPZD || Opcode == ARM::VCMPZS)
1647 RegClass = OpInfo[OpIdx].RegClass;
1648 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1649 "Reg operand expected");
1650 isSP = (RegClass == ARM::SPRRegClassID);
1652 MI.addOperand(MCOperand::CreateReg(
1653 getRegisterEnum(B, RegClass, decodeVFPRm(insn, isSP))));
1659 // All the instructions have homogeneous [VFP]Rd, [VFP]Rn, and [VFP]Rm regs.
1660 // Some of them have operand constraints which tie the first operand in the
1661 // InOperandList to that of the dst. As far as asm printing is concerned, this
1662 // tied_to operand is simply skipped.
1663 static bool DisassembleVFPBinaryFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1664 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1666 assert(NumOps >= 3 && "VFPBinaryFrm expects NumOps >= 3");
1668 const TargetInstrDesc &TID = ARMInsts[Opcode];
1669 const TargetOperandInfo *OpInfo = TID.OpInfo;
1670 unsigned &OpIdx = NumOpsAdded;
1674 unsigned RegClass = OpInfo[OpIdx].RegClass;
1675 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1676 "Reg operand expected");
1677 bool isSP = (RegClass == ARM::SPRRegClassID);
1679 MI.addOperand(MCOperand::CreateReg(
1680 getRegisterEnum(B, RegClass, decodeVFPRd(insn, isSP))));
1683 // Skip tied_to operand constraint.
1684 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
1685 assert(NumOps >= 4 && "Expect >=4 operands");
1686 MI.addOperand(MCOperand::CreateReg(0));
1690 MI.addOperand(MCOperand::CreateReg(
1691 getRegisterEnum(B, RegClass, decodeVFPRn(insn, isSP))));
1694 MI.addOperand(MCOperand::CreateReg(
1695 getRegisterEnum(B, RegClass, decodeVFPRm(insn, isSP))));
1701 // A8.6.295 vcvt (floating-point <-> integer)
1702 // Int to FP: VSITOD, VSITOS, VUITOD, VUITOS
1703 // FP to Int: VTOSI[Z|R]D, VTOSI[Z|R]S, VTOUI[Z|R]D, VTOUI[Z|R]S
1705 // A8.6.297 vcvt (floating-point and fixed-point)
1706 // Dd|Sd Dd|Sd(TIED_TO) #fbits(= 16|32 - UInt(imm4:i))
1707 static bool DisassembleVFPConv1Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1708 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1710 assert(NumOps >= 2 && "VFPConv1Frm expects NumOps >= 2");
1712 const TargetInstrDesc &TID = ARMInsts[Opcode];
1713 const TargetOperandInfo *OpInfo = TID.OpInfo;
1714 if (!OpInfo) return false;
1716 bool SP = slice(insn, 8, 8) == 0; // A8.6.295 & A8.6.297
1717 bool fixed_point = slice(insn, 17, 17) == 1; // A8.6.297
1718 unsigned RegClassID = SP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1722 assert(NumOps >= 3 && "Expect >= 3 operands");
1723 int size = slice(insn, 7, 7) == 0 ? 16 : 32;
1724 int fbits = size - (slice(insn,3,0) << 1 | slice(insn,5,5));
1725 MI.addOperand(MCOperand::CreateReg(
1726 getRegisterEnum(B, RegClassID,
1727 decodeVFPRd(insn, SP))));
1729 assert(TID.getOperandConstraint(1, TOI::TIED_TO) != -1 &&
1730 "Tied to operand expected");
1731 MI.addOperand(MI.getOperand(0));
1733 assert(OpInfo[2].RegClass < 0 && !OpInfo[2].isPredicate() &&
1734 !OpInfo[2].isOptionalDef() && "Imm operand expected");
1735 MI.addOperand(MCOperand::CreateImm(fbits));
1740 // The Rd (destination) and Rm (source) bits have different interpretations
1741 // depending on their single-precisonness.
1743 if (slice(insn, 18, 18) == 1) { // to_integer operation
1744 d = decodeVFPRd(insn, true /* Is Single Precision */);
1745 MI.addOperand(MCOperand::CreateReg(
1746 getRegisterEnum(B, ARM::SPRRegClassID, d)));
1747 m = decodeVFPRm(insn, SP);
1748 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, m)));
1750 d = decodeVFPRd(insn, SP);
1751 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, d)));
1752 m = decodeVFPRm(insn, true /* Is Single Precision */);
1753 MI.addOperand(MCOperand::CreateReg(
1754 getRegisterEnum(B, ARM::SPRRegClassID, m)));
1762 // VMOVRS - A8.6.330
1763 // Rt => Rd; Sn => UInt(Vn:N)
1764 static bool DisassembleVFPConv2Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1765 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1767 assert(NumOps >= 2 && "VFPConv2Frm expects NumOps >= 2");
1769 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1771 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1772 decodeVFPRn(insn, true))));
1777 // VMOVRRD - A8.6.332
1778 // Rt => Rd; Rt2 => Rn; Dm => UInt(M:Vm)
1780 // VMOVRRS - A8.6.331
1781 // Rt => Rd; Rt2 => Rn; Sm => UInt(Vm:M); Sm1 = Sm+1
1782 static bool DisassembleVFPConv3Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1783 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1785 assert(NumOps >= 3 && "VFPConv3Frm expects NumOps >= 3");
1787 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1788 unsigned &OpIdx = NumOpsAdded;
1790 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1792 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1796 if (OpInfo[OpIdx].RegClass == ARM::SPRRegClassID) {
1797 unsigned Sm = decodeVFPRm(insn, true);
1798 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1800 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1804 MI.addOperand(MCOperand::CreateReg(
1805 getRegisterEnum(B, ARM::DPRRegClassID,
1806 decodeVFPRm(insn, false))));
1812 // VMOVSR - A8.6.330
1813 // Rt => Rd; Sn => UInt(Vn:N)
1814 static bool DisassembleVFPConv4Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1815 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1817 assert(NumOps >= 2 && "VFPConv4Frm expects NumOps >= 2");
1819 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1820 decodeVFPRn(insn, true))));
1821 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1827 // VMOVDRR - A8.6.332
1828 // Rt => Rd; Rt2 => Rn; Dm => UInt(M:Vm)
1830 // VMOVRRS - A8.6.331
1831 // Rt => Rd; Rt2 => Rn; Sm => UInt(Vm:M); Sm1 = Sm+1
1832 static bool DisassembleVFPConv5Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1833 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1835 assert(NumOps >= 3 && "VFPConv5Frm expects NumOps >= 3");
1837 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1838 unsigned &OpIdx = NumOpsAdded;
1842 if (OpInfo[OpIdx].RegClass == ARM::SPRRegClassID) {
1843 unsigned Sm = decodeVFPRm(insn, true);
1844 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1846 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1850 MI.addOperand(MCOperand::CreateReg(
1851 getRegisterEnum(B, ARM::DPRRegClassID,
1852 decodeVFPRm(insn, false))));
1856 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1858 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1864 // VFP Load/Store Instructions.
1865 // VLDRD, VLDRS, VSTRD, VSTRS
1866 static bool DisassembleVFPLdStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1867 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1869 assert(NumOps >= 3 && "VFPLdStFrm expects NumOps >= 3");
1871 bool isSPVFP = (Opcode == ARM::VLDRS || Opcode == ARM::VSTRS);
1872 unsigned RegClassID = isSPVFP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1874 // Extract Dd/Sd for operand 0.
1875 unsigned RegD = decodeVFPRd(insn, isSPVFP);
1877 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, RegD)));
1879 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1880 MI.addOperand(MCOperand::CreateReg(Base));
1882 // Next comes the AM5 Opcode.
1883 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1884 unsigned char Imm8 = insn & 0xFF;
1885 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(AddrOpcode, Imm8)));
1892 // VFP Load/Store Multiple Instructions.
1893 // We have an optional write back reg, the base, and two predicate operands.
1894 // It is then followed by a reglist of either DPR(s) or SPR(s).
1896 // VLDMD[_UPD], VLDMS[_UPD], VSTMD[_UPD], VSTMS[_UPD]
1897 static bool DisassembleVFPLdStMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1898 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1900 assert(NumOps >= 4 && "VFPLdStMulFrm expects NumOps >= 4");
1902 unsigned &OpIdx = NumOpsAdded;
1906 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1908 // Writeback to base, if necessary.
1909 if (Opcode == ARM::VLDMDIA_UPD || Opcode == ARM::VLDMSIA_UPD ||
1910 Opcode == ARM::VLDMDDB_UPD || Opcode == ARM::VLDMSDB_UPD ||
1911 Opcode == ARM::VSTMDIA_UPD || Opcode == ARM::VSTMSIA_UPD ||
1912 Opcode == ARM::VSTMDDB_UPD || Opcode == ARM::VSTMSDB_UPD) {
1913 MI.addOperand(MCOperand::CreateReg(Base));
1917 MI.addOperand(MCOperand::CreateReg(Base));
1919 // Handling the two predicate operands before the reglist.
1920 int64_t CondVal = getCondField(insn);
1923 MI.addOperand(MCOperand::CreateImm(CondVal));
1924 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
1928 bool isSPVFP = (Opcode == ARM::VLDMSIA ||
1929 Opcode == ARM::VLDMSIA_UPD || Opcode == ARM::VLDMSDB_UPD ||
1930 Opcode == ARM::VSTMSIA ||
1931 Opcode == ARM::VSTMSIA_UPD || Opcode == ARM::VSTMSDB_UPD);
1932 unsigned RegClassID = isSPVFP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1935 unsigned RegD = decodeVFPRd(insn, isSPVFP);
1937 // Fill the variadic part of reglist.
1938 unsigned char Imm8 = insn & 0xFF;
1939 unsigned Regs = isSPVFP ? Imm8 : Imm8/2;
1941 // Apply some sanity checks before proceeding.
1942 if (Regs == 0 || (RegD + Regs) > 32 || (!isSPVFP && Regs > 16))
1945 for (unsigned i = 0; i < Regs; ++i) {
1946 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID,
1954 // Misc. VFP Instructions.
1955 // FMSTAT (vmrs with Rt=0b1111, i.e., to apsr_nzcv and no register operand)
1956 // FCONSTD (DPR and a VFPf64Imm operand)
1957 // FCONSTS (SPR and a VFPf32Imm operand)
1958 // VMRS/VMSR (GPR operand)
1959 static bool DisassembleVFPMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1960 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1962 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1963 unsigned &OpIdx = NumOpsAdded;
1967 if (Opcode == ARM::FMSTAT)
1970 assert(NumOps >= 2 && "VFPMiscFrm expects >=2 operands");
1972 unsigned RegEnum = 0;
1973 switch (OpInfo[0].RegClass) {
1974 case ARM::DPRRegClassID:
1975 RegEnum = getRegisterEnum(B, ARM::DPRRegClassID, decodeVFPRd(insn, false));
1977 case ARM::SPRRegClassID:
1978 RegEnum = getRegisterEnum(B, ARM::SPRRegClassID, decodeVFPRd(insn, true));
1980 case ARM::GPRRegClassID:
1981 RegEnum = getRegisterEnum(B, ARM::GPRRegClassID, decodeRd(insn));
1984 assert(0 && "Invalid reg class id");
1988 MI.addOperand(MCOperand::CreateReg(RegEnum));
1991 // Extract/decode the f64/f32 immediate.
1992 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
1993 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1994 // The asm syntax specifies the floating point value, not the 8-bit literal.
1995 APInt immRaw = VFPExpandImm(slice(insn,19,16) << 4 | slice(insn, 3, 0),
1996 Opcode == ARM::FCONSTD ? 64 : 32);
1997 APFloat immFP = APFloat(immRaw, true);
1998 double imm = Opcode == ARM::FCONSTD ? immFP.convertToDouble() :
1999 immFP.convertToFloat();
2000 MI.addOperand(MCOperand::CreateFPImm(imm));
2008 // DisassembleThumbFrm() is defined in ThumbDisassemblerCore.h file.
2009 #include "ThumbDisassemblerCore.h"
2011 /////////////////////////////////////////////////////
2013 // Utility Functions For ARM Advanced SIMD //
2015 /////////////////////////////////////////////////////
2017 // The following NEON namings are based on A8.6.266 VABA, VABAL. Notice that
2018 // A8.6.303 VDUP (ARM core register)'s D/Vd pair is the N/Vn pair of VABA/VABAL.
2020 // A7.3 Register encoding
2022 // Extract/Decode NEON D/Vd:
2024 // Note that for quadword, Qd = UInt(D:Vd<3:1>) = Inst{22:15-13}, whereas for
2025 // doubleword, Dd = UInt(D:Vd). We compensate for this difference by
2026 // handling it in the getRegisterEnum() utility function.
2027 // D = Inst{22}, Vd = Inst{15-12}
2028 static unsigned decodeNEONRd(uint32_t insn) {
2029 return ((insn >> ARMII::NEON_D_BitShift) & 1) << 4
2030 | ((insn >> ARMII::NEON_RegRdShift) & ARMII::NEONRegMask);
2033 // Extract/Decode NEON N/Vn:
2035 // Note that for quadword, Qn = UInt(N:Vn<3:1>) = Inst{7:19-17}, whereas for
2036 // doubleword, Dn = UInt(N:Vn). We compensate for this difference by
2037 // handling it in the getRegisterEnum() utility function.
2038 // N = Inst{7}, Vn = Inst{19-16}
2039 static unsigned decodeNEONRn(uint32_t insn) {
2040 return ((insn >> ARMII::NEON_N_BitShift) & 1) << 4
2041 | ((insn >> ARMII::NEON_RegRnShift) & ARMII::NEONRegMask);
2044 // Extract/Decode NEON M/Vm:
2046 // Note that for quadword, Qm = UInt(M:Vm<3:1>) = Inst{5:3-1}, whereas for
2047 // doubleword, Dm = UInt(M:Vm). We compensate for this difference by
2048 // handling it in the getRegisterEnum() utility function.
2049 // M = Inst{5}, Vm = Inst{3-0}
2050 static unsigned decodeNEONRm(uint32_t insn) {
2051 return ((insn >> ARMII::NEON_M_BitShift) & 1) << 4
2052 | ((insn >> ARMII::NEON_RegRmShift) & ARMII::NEONRegMask);
2063 } // End of unnamed namespace
2065 // size field -> Inst{11-10}
2066 // index_align field -> Inst{7-4}
2068 // The Lane Index interpretation depends on the Data Size:
2069 // 8 (encoded as size = 0b00) -> Index = index_align[3:1]
2070 // 16 (encoded as size = 0b01) -> Index = index_align[3:2]
2071 // 32 (encoded as size = 0b10) -> Index = index_align[3]
2073 // Ref: A8.6.317 VLD4 (single 4-element structure to one lane).
2074 static unsigned decodeLaneIndex(uint32_t insn) {
2075 unsigned size = insn >> 10 & 3;
2076 assert((size == 0 || size == 1 || size == 2) &&
2077 "Encoding error: size should be either 0, 1, or 2");
2079 unsigned index_align = insn >> 4 & 0xF;
2080 return (index_align >> 1) >> size;
2083 // imm64 = AdvSIMDExpandImm(op, cmode, i:imm3:imm4)
2084 // op = Inst{5}, cmode = Inst{11-8}
2085 // i = Inst{24} (ARM architecture)
2086 // imm3 = Inst{18-16}, imm4 = Inst{3-0}
2087 // Ref: Table A7-15 Modified immediate values for Advanced SIMD instructions.
2088 static uint64_t decodeN1VImm(uint32_t insn, ElemSize esize) {
2089 unsigned char op = (insn >> 5) & 1;
2090 unsigned char cmode = (insn >> 8) & 0xF;
2091 unsigned char Imm8 = ((insn >> 24) & 1) << 7 |
2092 ((insn >> 16) & 7) << 4 |
2094 return (op << 12) | (cmode << 8) | Imm8;
2097 // A8.6.339 VMUL, VMULL (by scalar)
2098 // ESize16 => m = Inst{2-0} (Vm<2:0>) D0-D7
2099 // ESize32 => m = Inst{3-0} (Vm<3:0>) D0-D15
2100 static unsigned decodeRestrictedDm(uint32_t insn, ElemSize esize) {
2107 assert(0 && "Unreachable code!");
2112 // A8.6.339 VMUL, VMULL (by scalar)
2113 // ESize16 => index = Inst{5:3} (M:Vm<3>) D0-D7
2114 // ESize32 => index = Inst{5} (M) D0-D15
2115 static unsigned decodeRestrictedDmIndex(uint32_t insn, ElemSize esize) {
2118 return (((insn >> 5) & 1) << 1) | ((insn >> 3) & 1);
2120 return (insn >> 5) & 1;
2122 assert(0 && "Unreachable code!");
2127 // A8.6.296 VCVT (between floating-point and fixed-point, Advanced SIMD)
2128 // (64 - <fbits>) is encoded as imm6, i.e., Inst{21-16}.
2129 static unsigned decodeVCVTFractionBits(uint32_t insn) {
2130 return 64 - ((insn >> 16) & 0x3F);
2133 // A8.6.302 VDUP (scalar)
2134 // ESize8 => index = Inst{19-17}
2135 // ESize16 => index = Inst{19-18}
2136 // ESize32 => index = Inst{19}
2137 static unsigned decodeNVLaneDupIndex(uint32_t insn, ElemSize esize) {
2140 return (insn >> 17) & 7;
2142 return (insn >> 18) & 3;
2144 return (insn >> 19) & 1;
2146 assert(0 && "Unspecified element size!");
2151 // A8.6.328 VMOV (ARM core register to scalar)
2152 // A8.6.329 VMOV (scalar to ARM core register)
2153 // ESize8 => index = Inst{21:6-5}
2154 // ESize16 => index = Inst{21:6}
2155 // ESize32 => index = Inst{21}
2156 static unsigned decodeNVLaneOpIndex(uint32_t insn, ElemSize esize) {
2159 return ((insn >> 21) & 1) << 2 | ((insn >> 5) & 3);
2161 return ((insn >> 21) & 1) << 1 | ((insn >> 6) & 1);
2163 return ((insn >> 21) & 1);
2165 assert(0 && "Unspecified element size!");
2170 // Imm6 = Inst{21-16}, L = Inst{7}
2172 // LeftShift == true (A8.6.367 VQSHL, A8.6.387 VSLI):
2174 // '0001xxx' => esize = 8; shift_amount = imm6 - 8
2175 // '001xxxx' => esize = 16; shift_amount = imm6 - 16
2176 // '01xxxxx' => esize = 32; shift_amount = imm6 - 32
2177 // '1xxxxxx' => esize = 64; shift_amount = imm6
2179 // LeftShift == false (A8.6.376 VRSHR, A8.6.368 VQSHRN):
2181 // '0001xxx' => esize = 8; shift_amount = 16 - imm6
2182 // '001xxxx' => esize = 16; shift_amount = 32 - imm6
2183 // '01xxxxx' => esize = 32; shift_amount = 64 - imm6
2184 // '1xxxxxx' => esize = 64; shift_amount = 64 - imm6
2186 static unsigned decodeNVSAmt(uint32_t insn, bool LeftShift) {
2187 ElemSize esize = ESizeNA;
2188 unsigned L = (insn >> 7) & 1;
2189 unsigned imm6 = (insn >> 16) & 0x3F;
2193 else if (imm6 >> 4 == 1)
2195 else if (imm6 >> 5 == 1)
2198 assert(0 && "Wrong encoding of Inst{7:21-16}!");
2203 return esize == ESize64 ? imm6 : (imm6 - esize);
2205 return esize == ESize64 ? (esize - imm6) : (2*esize - imm6);
2209 // Imm4 = Inst{11-8}
2210 static unsigned decodeN3VImm(uint32_t insn) {
2211 return (insn >> 8) & 0xF;
2215 // D[d] D[d2] ... Rn [TIED_TO Rn] align [Rm]
2217 // D[d] D[d2] ... Rn [TIED_TO Rn] align [Rm] TIED_TO ... imm(idx)
2219 // Rn [TIED_TO Rn] align [Rm] D[d] D[d2] ...
2221 // Rn [TIED_TO Rn] align [Rm] D[d] D[d2] ... [imm(idx)]
2223 // Correctly set VLD*/VST*'s TIED_TO GPR, as the asm printer needs it.
2224 static bool DisassembleNLdSt0(MCInst &MI, unsigned Opcode, uint32_t insn,
2225 unsigned short NumOps, unsigned &NumOpsAdded, bool Store, bool DblSpaced,
2226 unsigned alignment, BO B) {
2228 const TargetInstrDesc &TID = ARMInsts[Opcode];
2229 const TargetOperandInfo *OpInfo = TID.OpInfo;
2231 // At least one DPR register plus addressing mode #6.
2232 assert(NumOps >= 3 && "Expect >= 3 operands");
2234 unsigned &OpIdx = NumOpsAdded;
2238 // We have homogeneous NEON registers for Load/Store.
2239 unsigned RegClass = 0;
2241 // Double-spaced registers have increments of 2.
2242 unsigned Inc = DblSpaced ? 2 : 1;
2244 unsigned Rn = decodeRn(insn);
2245 unsigned Rm = decodeRm(insn);
2246 unsigned Rd = decodeNEONRd(insn);
2248 // A7.7.1 Advanced SIMD addressing mode.
2251 // LLVM Addressing Mode #6.
2252 unsigned RmEnum = 0;
2254 RmEnum = getRegisterEnum(B, ARM::GPRRegClassID, Rm);
2257 // Consume possible WB, AddrMode6, possible increment reg, the DPR/QPR's,
2258 // then possible lane index.
2259 assert(OpIdx < NumOps && OpInfo[0].RegClass == ARM::GPRRegClassID &&
2260 "Reg operand expected");
2263 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2268 assert((OpIdx+1) < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
2269 OpInfo[OpIdx + 1].RegClass < 0 && "Addrmode #6 Operands expected");
2270 // addrmode6 := (ops GPR:$addr, i32imm)
2271 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2273 MI.addOperand(MCOperand::CreateImm(alignment)); // Alignment
2277 MI.addOperand(MCOperand::CreateReg(RmEnum));
2281 assert(OpIdx < NumOps &&
2282 (OpInfo[OpIdx].RegClass == ARM::DPRRegClassID ||
2283 OpInfo[OpIdx].RegClass == ARM::QPRRegClassID) &&
2284 "Reg operand expected");
2286 RegClass = OpInfo[OpIdx].RegClass;
2287 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2288 MI.addOperand(MCOperand::CreateReg(
2289 getRegisterEnum(B, RegClass, Rd)));
2294 // Handle possible lane index.
2295 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2296 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2297 MI.addOperand(MCOperand::CreateImm(decodeLaneIndex(insn)));
2302 // Consume the DPR/QPR's, possible WB, AddrMode6, possible incrment reg,
2303 // possible TIED_TO DPR/QPR's (ignored), then possible lane index.
2304 RegClass = OpInfo[0].RegClass;
2306 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2307 MI.addOperand(MCOperand::CreateReg(
2308 getRegisterEnum(B, RegClass, Rd)));
2314 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2319 assert((OpIdx+1) < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
2320 OpInfo[OpIdx + 1].RegClass < 0 && "Addrmode #6 Operands expected");
2321 // addrmode6 := (ops GPR:$addr, i32imm)
2322 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2324 MI.addOperand(MCOperand::CreateImm(alignment)); // Alignment
2328 MI.addOperand(MCOperand::CreateReg(RmEnum));
2332 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2333 assert(TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1 &&
2334 "Tied to operand expected");
2335 MI.addOperand(MCOperand::CreateReg(0));
2339 // Handle possible lane index.
2340 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2341 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2342 MI.addOperand(MCOperand::CreateImm(decodeLaneIndex(insn)));
2347 // Accessing registers past the end of the NEON register file is not
2355 // A8.6.308, A8.6.311, A8.6.314, A8.6.317.
2356 static bool Align4OneLaneInst(unsigned elem, unsigned size,
2357 unsigned index_align, unsigned & alignment) {
2365 return slice(index_align, 0, 0) == 0;
2366 else if (size == 1) {
2367 bits = slice(index_align, 1, 0);
2368 if (bits != 0 && bits != 1)
2373 } else if (size == 2) {
2374 bits = slice(index_align, 2, 0);
2375 if (bits != 0 && bits != 3)
2385 if (slice(index_align, 0, 0) == 1)
2389 if (slice(index_align, 0, 0) == 1)
2392 } else if (size == 2) {
2393 if (slice(index_align, 1, 1) != 0)
2395 if (slice(index_align, 0, 0) == 1)
2403 if (slice(index_align, 0, 0) != 0)
2407 if (slice(index_align, 0, 0) != 0)
2411 } else if (size == 2) {
2412 if (slice(index_align, 1, 0) != 0)
2420 if (slice(index_align, 0, 0) == 1)
2424 if (slice(index_align, 0, 0) == 1)
2427 } else if (size == 2) {
2428 bits = slice(index_align, 1, 0);
2442 // If L (Inst{21}) == 0, store instructions.
2443 // Find out about double-spaced-ness of the Opcode and pass it on to
2444 // DisassembleNLdSt0().
2445 static bool DisassembleNLdSt(MCInst &MI, unsigned Opcode, uint32_t insn,
2446 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2448 const StringRef Name = ARMInsts[Opcode].Name;
2449 bool DblSpaced = false;
2450 // 0 represents standard alignment, i.e., unaligned data access.
2451 unsigned alignment = 0;
2453 if (Name.find("LN") != std::string::npos) {
2454 // To one lane instructions.
2455 // See, for example, 8.6.317 VLD4 (single 4-element structure to one lane).
2457 unsigned elem = 0; // legal values: {1, 2, 3, 4}
2458 if (Name.startswith("VST1") || Name.startswith("VLD1"))
2461 if (Name.startswith("VST2") || Name.startswith("VLD2"))
2464 if (Name.startswith("VST3") || Name.startswith("VLD3"))
2467 if (Name.startswith("VST4") || Name.startswith("VLD4"))
2470 // Utility function takes number of elements, size, and index_align.
2471 if (!Align4OneLaneInst(elem,
2472 slice(insn, 11, 10),
2477 // <size> == 16 && Inst{5} == 1 --> DblSpaced = true
2478 if (Name.endswith("16") || Name.endswith("16_UPD"))
2479 DblSpaced = slice(insn, 5, 5) == 1;
2481 // <size> == 32 && Inst{6} == 1 --> DblSpaced = true
2482 if (Name.endswith("32") || Name.endswith("32_UPD"))
2483 DblSpaced = slice(insn, 6, 6) == 1;
2485 // Multiple n-element structures with type encoded as Inst{11-8}.
2486 // See, for example, A8.6.316 VLD4 (multiple 4-element structures).
2488 // Inst{5-4} encodes alignment.
2489 switch (slice(insn, 5, 4)) {
2493 alignment = 64; break;
2495 alignment = 128; break;
2497 alignment = 256; break;
2500 // n == 2 && type == 0b1001 -> DblSpaced = true
2501 if (Name.startswith("VST2") || Name.startswith("VLD2"))
2502 DblSpaced = slice(insn, 11, 8) == 9;
2504 // n == 3 && type == 0b0101 -> DblSpaced = true
2505 if (Name.startswith("VST3") || Name.startswith("VLD3")) {
2506 // A8.6.313 & A8.6.395
2507 if (slice(insn, 7, 6) == 3 && slice(insn, 5, 5) == 1)
2510 DblSpaced = slice(insn, 11, 8) == 5;
2513 // n == 4 && type == 0b0001 -> DblSpaced = true
2514 if (Name.startswith("VST4") || Name.startswith("VLD4"))
2515 DblSpaced = slice(insn, 11, 8) == 1;
2517 return DisassembleNLdSt0(MI, Opcode, insn, NumOps, NumOpsAdded,
2518 slice(insn, 21, 21) == 0, DblSpaced, alignment/8, B);
2525 // Qd/Dd imm src(=Qd/Dd)
2526 static bool DisassembleN1RegModImmFrm(MCInst &MI, unsigned Opcode,
2527 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2529 const TargetInstrDesc &TID = ARMInsts[Opcode];
2530 const TargetOperandInfo *OpInfo = TID.OpInfo;
2532 assert(NumOps >= 2 &&
2533 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2534 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2535 (OpInfo[1].RegClass < 0) &&
2536 "Expect 1 reg operand followed by 1 imm operand");
2538 // Qd/Dd = Inst{22:15-12} => NEON Rd
2539 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[0].RegClass,
2540 decodeNEONRd(insn))));
2542 ElemSize esize = ESizeNA;
2545 case ARM::VMOVv16i8:
2548 case ARM::VMOVv4i16:
2549 case ARM::VMOVv8i16:
2550 case ARM::VMVNv4i16:
2551 case ARM::VMVNv8i16:
2552 case ARM::VBICiv4i16:
2553 case ARM::VBICiv8i16:
2554 case ARM::VORRiv4i16:
2555 case ARM::VORRiv8i16:
2558 case ARM::VMOVv2i32:
2559 case ARM::VMOVv4i32:
2560 case ARM::VMVNv2i32:
2561 case ARM::VMVNv4i32:
2562 case ARM::VBICiv2i32:
2563 case ARM::VBICiv4i32:
2564 case ARM::VORRiv2i32:
2565 case ARM::VORRiv4i32:
2568 case ARM::VMOVv1i64:
2569 case ARM::VMOVv2i64:
2573 assert(0 && "Unexpected opcode!");
2577 // One register and a modified immediate value.
2578 // Add the imm operand.
2579 MI.addOperand(MCOperand::CreateImm(decodeN1VImm(insn, esize)));
2583 // VBIC/VORRiv*i* variants have an extra $src = $Vd to be filled in.
2585 (OpInfo[2].RegClass == ARM::DPRRegClassID ||
2586 OpInfo[2].RegClass == ARM::QPRRegClassID)) {
2587 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[0].RegClass,
2588 decodeNEONRd(insn))));
2599 N2V_VectorConvert_Between_Float_Fixed
2601 } // End of unnamed namespace
2603 // Vector Convert [between floating-point and fixed-point]
2604 // Qd/Dd Qm/Dm [fbits]
2606 // Vector Duplicate Lane (from scalar to all elements) Instructions.
2607 // VDUPLN16d, VDUPLN16q, VDUPLN32d, VDUPLN32q, VDUPLN8d, VDUPLN8q:
2610 // Vector Move Long:
2613 // Vector Move Narrow:
2617 static bool DisassembleNVdVmOptImm(MCInst &MI, unsigned Opc, uint32_t insn,
2618 unsigned short NumOps, unsigned &NumOpsAdded, N2VFlag Flag, BO B) {
2620 const TargetInstrDesc &TID = ARMInsts[Opc];
2621 const TargetOperandInfo *OpInfo = TID.OpInfo;
2623 assert(NumOps >= 2 &&
2624 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2625 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2626 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2627 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2628 "Expect >= 2 operands and first 2 as reg operands");
2630 unsigned &OpIdx = NumOpsAdded;
2634 ElemSize esize = ESizeNA;
2635 if (Flag == N2V_VectorDupLane) {
2636 // VDUPLN has its index embedded. Its size can be inferred from the Opcode.
2637 assert(Opc >= ARM::VDUPLN16d && Opc <= ARM::VDUPLN8q &&
2638 "Unexpected Opcode");
2639 esize = (Opc == ARM::VDUPLN8d || Opc == ARM::VDUPLN8q) ? ESize8
2640 : ((Opc == ARM::VDUPLN16d || Opc == ARM::VDUPLN16q) ? ESize16
2644 // Qd/Dd = Inst{22:15-12} => NEON Rd
2645 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2646 decodeNEONRd(insn))));
2650 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2652 MI.addOperand(MCOperand::CreateReg(0));
2656 // Dm = Inst{5:3-0} => NEON Rm
2657 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2658 decodeNEONRm(insn))));
2661 // VZIP and others have two TIED_TO reg operands.
2663 while (OpIdx < NumOps &&
2664 (Idx = TID.getOperandConstraint(OpIdx, TOI::TIED_TO)) != -1) {
2665 // Add TIED_TO operand.
2666 MI.addOperand(MI.getOperand(Idx));
2670 // Add the imm operand, if required.
2671 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2672 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2674 unsigned imm = 0xFFFFFFFF;
2676 if (Flag == N2V_VectorDupLane)
2677 imm = decodeNVLaneDupIndex(insn, esize);
2678 if (Flag == N2V_VectorConvert_Between_Float_Fixed)
2679 imm = decodeVCVTFractionBits(insn);
2681 assert(imm != 0xFFFFFFFF && "Internal error");
2682 MI.addOperand(MCOperand::CreateImm(imm));
2689 static bool DisassembleN2RegFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2690 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2692 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2695 static bool DisassembleNVCVTFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2696 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2698 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2699 N2V_VectorConvert_Between_Float_Fixed, B);
2701 static bool DisassembleNVecDupLnFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2702 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2704 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2705 N2V_VectorDupLane, B);
2708 // Vector Shift [Accumulate] Instructions.
2709 // Qd/Dd [Qd/Dd (TIED_TO)] Qm/Dm ShiftAmt
2711 // Vector Shift Left Long (with maximum shift count) Instructions.
2712 // VSHLLi16, VSHLLi32, VSHLLi8: Qd Dm imm (== size)
2714 static bool DisassembleNVectorShift(MCInst &MI, unsigned Opcode, uint32_t insn,
2715 unsigned short NumOps, unsigned &NumOpsAdded, bool LeftShift, BO B) {
2717 const TargetInstrDesc &TID = ARMInsts[Opcode];
2718 const TargetOperandInfo *OpInfo = TID.OpInfo;
2720 assert(NumOps >= 3 &&
2721 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2722 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2723 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2724 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2725 "Expect >= 3 operands and first 2 as reg operands");
2727 unsigned &OpIdx = NumOpsAdded;
2731 // Qd/Dd = Inst{22:15-12} => NEON Rd
2732 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2733 decodeNEONRd(insn))));
2736 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2738 MI.addOperand(MCOperand::CreateReg(0));
2742 assert((OpInfo[OpIdx].RegClass == ARM::DPRRegClassID ||
2743 OpInfo[OpIdx].RegClass == ARM::QPRRegClassID) &&
2744 "Reg operand expected");
2746 // Qm/Dm = Inst{5:3-0} => NEON Rm
2747 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2748 decodeNEONRm(insn))));
2751 assert(OpInfo[OpIdx].RegClass < 0 && "Imm operand expected");
2753 // Add the imm operand.
2755 // VSHLL has maximum shift count as the imm, inferred from its size.
2759 Imm = decodeNVSAmt(insn, LeftShift);
2771 MI.addOperand(MCOperand::CreateImm(Imm));
2777 // Left shift instructions.
2778 static bool DisassembleN2RegVecShLFrm(MCInst &MI, unsigned Opcode,
2779 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2781 return DisassembleNVectorShift(MI, Opcode, insn, NumOps, NumOpsAdded, true,
2784 // Right shift instructions have different shift amount interpretation.
2785 static bool DisassembleN2RegVecShRFrm(MCInst &MI, unsigned Opcode,
2786 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2788 return DisassembleNVectorShift(MI, Opcode, insn, NumOps, NumOpsAdded, false,
2797 N3V_Multiply_By_Scalar
2799 } // End of unnamed namespace
2801 // NEON Three Register Instructions with Optional Immediate Operand
2803 // Vector Extract Instructions.
2804 // Qd/Dd Qn/Dn Qm/Dm imm4
2806 // Vector Shift (Register) Instructions.
2807 // Qd/Dd Qm/Dm Qn/Dn (notice the order of m, n)
2809 // Vector Multiply [Accumulate/Subtract] [Long] By Scalar Instructions.
2810 // Qd/Dd Qn/Dn RestrictedDm index
2813 static bool DisassembleNVdVnVmOptImm(MCInst &MI, unsigned Opcode, uint32_t insn,
2814 unsigned short NumOps, unsigned &NumOpsAdded, N3VFlag Flag, BO B) {
2816 const TargetInstrDesc &TID = ARMInsts[Opcode];
2817 const TargetOperandInfo *OpInfo = TID.OpInfo;
2819 // No checking for OpInfo[2] because of MOVDneon/MOVQ with only two regs.
2820 assert(NumOps >= 3 &&
2821 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2822 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2823 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2824 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2825 "Expect >= 3 operands and first 2 as reg operands");
2827 unsigned &OpIdx = NumOpsAdded;
2831 bool VdVnVm = Flag == N3V_VectorShift ? false : true;
2832 bool IsImm4 = Flag == N3V_VectorExtract ? true : false;
2833 bool IsDmRestricted = Flag == N3V_Multiply_By_Scalar ? true : false;
2834 ElemSize esize = ESizeNA;
2835 if (Flag == N3V_Multiply_By_Scalar) {
2836 unsigned size = (insn >> 20) & 3;
2837 if (size == 1) esize = ESize16;
2838 if (size == 2) esize = ESize32;
2839 assert (esize == ESize16 || esize == ESize32);
2842 // Qd/Dd = Inst{22:15-12} => NEON Rd
2843 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2844 decodeNEONRd(insn))));
2847 // VABA, VABAL, VBSLd, VBSLq, ...
2848 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2850 MI.addOperand(MCOperand::CreateReg(0));
2854 // Dn = Inst{7:19-16} => NEON Rn
2856 // Dm = Inst{5:3-0} => NEON Rm
2857 MI.addOperand(MCOperand::CreateReg(
2858 getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2859 VdVnVm ? decodeNEONRn(insn)
2860 : decodeNEONRm(insn))));
2863 // Special case handling for VMOVDneon and VMOVQ because they are marked as
2865 if (Opcode == ARM::VMOVDneon || Opcode == ARM::VMOVQ)
2868 // Dm = Inst{5:3-0} => NEON Rm
2870 // Dm is restricted to D0-D7 if size is 16, D0-D15 otherwise
2872 // Dn = Inst{7:19-16} => NEON Rn
2873 unsigned m = VdVnVm ? (IsDmRestricted ? decodeRestrictedDm(insn, esize)
2874 : decodeNEONRm(insn))
2875 : decodeNEONRn(insn);
2877 MI.addOperand(MCOperand::CreateReg(
2878 getRegisterEnum(B, OpInfo[OpIdx].RegClass, m)));
2881 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2882 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2883 // Add the imm operand.
2886 Imm = decodeN3VImm(insn);
2887 else if (IsDmRestricted)
2888 Imm = decodeRestrictedDmIndex(insn, esize);
2890 assert(0 && "Internal error: unreachable code!");
2894 MI.addOperand(MCOperand::CreateImm(Imm));
2901 static bool DisassembleN3RegFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2902 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2904 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2907 static bool DisassembleN3RegVecShFrm(MCInst &MI, unsigned Opcode,
2908 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2910 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2911 N3V_VectorShift, B);
2913 static bool DisassembleNVecExtractFrm(MCInst &MI, unsigned Opcode,
2914 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2916 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2917 N3V_VectorExtract, B);
2919 static bool DisassembleNVecMulScalarFrm(MCInst &MI, unsigned Opcode,
2920 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2922 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2923 N3V_Multiply_By_Scalar, B);
2926 // Vector Table Lookup
2928 // VTBL1, VTBX1: Dd [Dd(TIED_TO)] Dn Dm
2929 // VTBL2, VTBX2: Dd [Dd(TIED_TO)] Dn Dn+1 Dm
2930 // VTBL3, VTBX3: Dd [Dd(TIED_TO)] Dn Dn+1 Dn+2 Dm
2931 // VTBL4, VTBX4: Dd [Dd(TIED_TO)] Dn Dn+1 Dn+2 Dn+3 Dm
2932 static bool DisassembleNVTBLFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2933 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2935 const TargetInstrDesc &TID = ARMInsts[Opcode];
2936 const TargetOperandInfo *OpInfo = TID.OpInfo;
2937 if (!OpInfo) return false;
2939 assert(NumOps >= 3 &&
2940 OpInfo[0].RegClass == ARM::DPRRegClassID &&
2941 OpInfo[1].RegClass == ARM::DPRRegClassID &&
2942 OpInfo[2].RegClass == ARM::DPRRegClassID &&
2943 "Expect >= 3 operands and first 3 as reg operands");
2945 unsigned &OpIdx = NumOpsAdded;
2949 unsigned Rn = decodeNEONRn(insn);
2951 // {Dn} encoded as len = 0b00
2952 // {Dn Dn+1} encoded as len = 0b01
2953 // {Dn Dn+1 Dn+2 } encoded as len = 0b10
2954 // {Dn Dn+1 Dn+2 Dn+3} encoded as len = 0b11
2955 unsigned Len = slice(insn, 9, 8) + 1;
2957 // Dd (the destination vector)
2958 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2959 decodeNEONRd(insn))));
2962 // Process tied_to operand constraint.
2964 if ((Idx = TID.getOperandConstraint(OpIdx, TOI::TIED_TO)) != -1) {
2965 MI.addOperand(MI.getOperand(Idx));
2969 // Do the <list> now.
2970 for (unsigned i = 0; i < Len; ++i) {
2971 assert(OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::DPRRegClassID &&
2972 "Reg operand expected");
2973 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2978 // Dm (the index vector)
2979 assert(OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::DPRRegClassID &&
2980 "Reg operand (index vector) expected");
2981 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2982 decodeNEONRm(insn))));
2988 // Vector Get Lane (move scalar to ARM core register) Instructions.
2989 // VGETLNi32, VGETLNs16, VGETLNs8, VGETLNu16, VGETLNu8: Rt Dn index
2990 static bool DisassembleNGetLnFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2991 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2993 const TargetInstrDesc &TID = ARMInsts[Opcode];
2994 const TargetOperandInfo *OpInfo = TID.OpInfo;
2995 if (!OpInfo) return false;
2997 assert(TID.getNumDefs() == 1 && NumOps >= 3 &&
2998 OpInfo[0].RegClass == ARM::GPRRegClassID &&
2999 OpInfo[1].RegClass == ARM::DPRRegClassID &&
3000 OpInfo[2].RegClass < 0 &&
3001 "Expect >= 3 operands with one dst operand");
3004 Opcode == ARM::VGETLNi32 ? ESize32
3005 : ((Opcode == ARM::VGETLNs16 || Opcode == ARM::VGETLNu16) ? ESize16
3008 // Rt = Inst{15-12} => ARM Rd
3009 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3012 // Dn = Inst{7:19-16} => NEON Rn
3013 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
3014 decodeNEONRn(insn))));
3016 MI.addOperand(MCOperand::CreateImm(decodeNVLaneOpIndex(insn, esize)));
3022 // Vector Set Lane (move ARM core register to scalar) Instructions.
3023 // VSETLNi16, VSETLNi32, VSETLNi8: Dd Dd (TIED_TO) Rt index
3024 static bool DisassembleNSetLnFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3025 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3027 const TargetInstrDesc &TID = ARMInsts[Opcode];
3028 const TargetOperandInfo *OpInfo = TID.OpInfo;
3029 if (!OpInfo) return false;
3031 assert(TID.getNumDefs() == 1 && NumOps >= 3 &&
3032 OpInfo[0].RegClass == ARM::DPRRegClassID &&
3033 OpInfo[1].RegClass == ARM::DPRRegClassID &&
3034 TID.getOperandConstraint(1, TOI::TIED_TO) != -1 &&
3035 OpInfo[2].RegClass == ARM::GPRRegClassID &&
3036 OpInfo[3].RegClass < 0 &&
3037 "Expect >= 3 operands with one dst operand");
3040 Opcode == ARM::VSETLNi8 ? ESize8
3041 : (Opcode == ARM::VSETLNi16 ? ESize16
3044 // Dd = Inst{7:19-16} => NEON Rn
3045 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
3046 decodeNEONRn(insn))));
3049 MI.addOperand(MCOperand::CreateReg(0));
3051 // Rt = Inst{15-12} => ARM Rd
3052 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3055 MI.addOperand(MCOperand::CreateImm(decodeNVLaneOpIndex(insn, esize)));
3061 // Vector Duplicate Instructions (from ARM core register to all elements).
3062 // VDUP8d, VDUP16d, VDUP32d, VDUP8q, VDUP16q, VDUP32q: Qd/Dd Rt
3063 static bool DisassembleNDupFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3064 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3066 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3068 assert(NumOps >= 2 &&
3069 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
3070 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
3071 OpInfo[1].RegClass == ARM::GPRRegClassID &&
3072 "Expect >= 2 operands and first 2 as reg operand");
3074 unsigned RegClass = OpInfo[0].RegClass;
3076 // Qd/Dd = Inst{7:19-16} => NEON Rn
3077 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClass,
3078 decodeNEONRn(insn))));
3080 // Rt = Inst{15-12} => ARM Rd
3081 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3091 static inline bool MemBarrierInstr(uint32_t insn) {
3092 unsigned op7_4 = slice(insn, 7, 4);
3093 if (slice(insn, 31, 8) == 0xf57ff0 && (op7_4 >= 4 && op7_4 <= 6))
3099 static inline bool PreLoadOpcode(unsigned Opcode) {
3101 case ARM::PLDi12: case ARM::PLDrs:
3102 case ARM::PLDWi12: case ARM::PLDWrs:
3103 case ARM::PLIi12: case ARM::PLIrs:
3110 static bool DisassemblePreLoadFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3111 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3113 // Preload Data/Instruction requires either 2 or 3 operands.
3114 // PLDi12, PLDWi12, PLIi12: addrmode_imm12
3115 // PLDrs, PLDWrs, PLIrs: ldst_so_reg
3117 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3120 if (Opcode == ARM::PLDi12 || Opcode == ARM::PLDWi12
3121 || Opcode == ARM::PLIi12) {
3122 unsigned Imm12 = slice(insn, 11, 0);
3123 bool Negative = getUBit(insn) == 0;
3125 // A8.6.118 PLD (literal) PLDWi12 with Rn=PC is transformed to PLDi12.
3126 if (Opcode == ARM::PLDWi12 && slice(insn, 19, 16) == 0xF) {
3127 DEBUG(errs() << "Rn == '1111': PLDWi12 morphed to PLDi12\n");
3128 MI.setOpcode(ARM::PLDi12);
3131 // -0 is represented specially. All other values are as normal.
3132 int Offset = Negative ? -1 * Imm12 : Imm12;
3133 if (Imm12 == 0 && Negative)
3136 MI.addOperand(MCOperand::CreateImm(Offset));
3139 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3142 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
3144 // Inst{6-5} encodes the shift opcode.
3145 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
3146 // Inst{11-7} encodes the imm5 shift amount.
3147 unsigned ShImm = slice(insn, 11, 7);
3149 // A8.4.1. Possible rrx or shift amount of 32...
3150 getImmShiftSE(ShOp, ShImm);
3151 MI.addOperand(MCOperand::CreateImm(
3152 ARM_AM::getAM2Opc(AddrOpcode, ShImm, ShOp)));
3159 static bool DisassembleMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3160 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3162 if (MemBarrierInstr(insn)) {
3163 // DMBsy, DSBsy, and ISBsy instructions have zero operand and are taken care
3164 // of within the generic ARMBasicMCBuilder::BuildIt() method.
3166 // Inst{3-0} encodes the memory barrier option for the variants.
3167 MI.addOperand(MCOperand::CreateImm(slice(insn, 3, 0)));
3183 // SWP, SWPB: Rd Rm Rn
3184 // Delegate to DisassembleLdStExFrm()....
3185 return DisassembleLdStExFrm(MI, Opcode, insn, NumOps, NumOpsAdded, B);
3190 if (Opcode == ARM::SETEND) {
3192 MI.addOperand(MCOperand::CreateImm(slice(insn, 9, 9)));
3196 // FIXME: To enable correct asm parsing and disasm of CPS we need 3 different
3197 // opcodes which match the same real instruction. This is needed since there's
3198 // no current handling of optional arguments. Fix here when a better handling
3199 // of optional arguments is implemented.
3200 if (Opcode == ARM::CPS3p) { // M = 1
3201 // Let's reject these impossible imod values by returning false:
3204 // AsmPrinter cannot handle imod=0b00, plus (imod=0b00,M=1,iflags!=0) is an
3205 // invalid combination, so we just check for imod=0b00 here.
3206 if (slice(insn, 19, 18) == 0 || slice(insn, 19, 18) == 1)
3208 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 18))); // imod
3209 MI.addOperand(MCOperand::CreateImm(slice(insn, 8, 6))); // iflags
3210 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0))); // mode
3214 if (Opcode == ARM::CPS2p) { // mode = 0, M = 0
3215 // Let's reject these impossible imod values by returning false:
3216 // 1. (imod=0b00,M=0)
3218 if (slice(insn, 19, 18) == 0 || slice(insn, 19, 18) == 1)
3220 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 18))); // imod
3221 MI.addOperand(MCOperand::CreateImm(slice(insn, 8, 6))); // iflags
3225 if (Opcode == ARM::CPS1p) { // imod = 0, iflags = 0, M = 1
3226 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0))); // mode
3231 // DBG has its option specified in Inst{3-0}.
3232 if (Opcode == ARM::DBG) {
3233 MI.addOperand(MCOperand::CreateImm(slice(insn, 3, 0)));
3238 // BKPT takes an imm32 val equal to ZeroExtend(Inst{19-8:3-0}).
3239 if (Opcode == ARM::BKPT) {
3240 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 8) << 4 |
3241 slice(insn, 3, 0)));
3246 if (PreLoadOpcode(Opcode))
3247 return DisassemblePreLoadFrm(MI, Opcode, insn, NumOps, NumOpsAdded, B);
3249 assert(0 && "Unexpected misc instruction!");
3253 /// FuncPtrs - FuncPtrs maps ARMFormat to its corresponding DisassembleFP.
3254 /// We divide the disassembly task into different categories, with each one
3255 /// corresponding to a specific instruction encoding format. There could be
3256 /// exceptions when handling a specific format, and that is why the Opcode is
3257 /// also present in the function prototype.
3258 static const DisassembleFP FuncPtrs[] = {
3262 &DisassembleBrMiscFrm,
3264 &DisassembleDPSoRegFrm,
3267 &DisassembleLdMiscFrm,
3268 &DisassembleStMiscFrm,
3269 &DisassembleLdStMulFrm,
3270 &DisassembleLdStExFrm,
3271 &DisassembleArithMiscFrm,
3274 &DisassembleVFPUnaryFrm,
3275 &DisassembleVFPBinaryFrm,
3276 &DisassembleVFPConv1Frm,
3277 &DisassembleVFPConv2Frm,
3278 &DisassembleVFPConv3Frm,
3279 &DisassembleVFPConv4Frm,
3280 &DisassembleVFPConv5Frm,
3281 &DisassembleVFPLdStFrm,
3282 &DisassembleVFPLdStMulFrm,
3283 &DisassembleVFPMiscFrm,
3284 &DisassembleThumbFrm,
3285 &DisassembleMiscFrm,
3286 &DisassembleNGetLnFrm,
3287 &DisassembleNSetLnFrm,
3288 &DisassembleNDupFrm,
3290 // VLD and VST (including one lane) Instructions.
3293 // A7.4.6 One register and a modified immediate value
3294 // 1-Register Instructions with imm.
3295 // LLVM only defines VMOVv instructions.
3296 &DisassembleN1RegModImmFrm,
3298 // 2-Register Instructions with no imm.
3299 &DisassembleN2RegFrm,
3301 // 2-Register Instructions with imm (vector convert float/fixed point).
3302 &DisassembleNVCVTFrm,
3304 // 2-Register Instructions with imm (vector dup lane).
3305 &DisassembleNVecDupLnFrm,
3307 // Vector Shift Left Instructions.
3308 &DisassembleN2RegVecShLFrm,
3310 // Vector Shift Righ Instructions, which has different interpretation of the
3311 // shift amount from the imm6 field.
3312 &DisassembleN2RegVecShRFrm,
3314 // 3-Register Data-Processing Instructions.
3315 &DisassembleN3RegFrm,
3317 // Vector Shift (Register) Instructions.
3318 // D:Vd M:Vm N:Vn (notice that M:Vm is the first operand)
3319 &DisassembleN3RegVecShFrm,
3321 // Vector Extract Instructions.
3322 &DisassembleNVecExtractFrm,
3324 // Vector [Saturating Rounding Doubling] Multiply [Accumulate/Subtract] [Long]
3325 // By Scalar Instructions.
3326 &DisassembleNVecMulScalarFrm,
3328 // Vector Table Lookup uses byte indexes in a control vector to look up byte
3329 // values in a table and generate a new vector.
3330 &DisassembleNVTBLFrm,
3335 /// BuildIt - BuildIt performs the build step for this ARM Basic MC Builder.
3336 /// The general idea is to set the Opcode for the MCInst, followed by adding
3337 /// the appropriate MCOperands to the MCInst. ARM Basic MC Builder delegates
3338 /// to the Format-specific disassemble function for disassembly, followed by
3339 /// TryPredicateAndSBitModifier() to do PredicateOperand and OptionalDefOperand
3340 /// which follow the Dst/Src Operands.
3341 bool ARMBasicMCBuilder::BuildIt(MCInst &MI, uint32_t insn) {
3342 // Stage 1 sets the Opcode.
3343 MI.setOpcode(Opcode);
3344 // If the number of operands is zero, we're done!
3348 // Stage 2 calls the format-specific disassemble function to build the operand
3352 unsigned NumOpsAdded = 0;
3353 bool OK = (*Disasm)(MI, Opcode, insn, NumOps, NumOpsAdded, this);
3355 if (!OK || this->Err != 0) return false;
3356 if (NumOpsAdded >= NumOps)
3359 // Stage 3 deals with operands unaccounted for after stage 2 is finished.
3360 // FIXME: Should this be done selectively?
3361 return TryPredicateAndSBitModifier(MI, Opcode, insn, NumOps - NumOpsAdded);
3364 // A8.3 Conditional execution
3365 // A8.3.1 Pseudocode details of conditional execution
3366 // Condition bits '111x' indicate the instruction is always executed.
3367 static uint32_t CondCode(uint32_t CondField) {
3368 if (CondField == 0xF)
3373 /// DoPredicateOperands - DoPredicateOperands process the predicate operands
3374 /// of some Thumb instructions which come before the reglist operands. It
3375 /// returns true if the two predicate operands have been processed.
3376 bool ARMBasicMCBuilder::DoPredicateOperands(MCInst& MI, unsigned Opcode,
3377 uint32_t /* insn */, unsigned short NumOpsRemaining) {
3379 assert(NumOpsRemaining > 0 && "Invalid argument");
3381 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3382 unsigned Idx = MI.getNumOperands();
3384 // First, we check whether this instr specifies the PredicateOperand through
3385 // a pair of TargetOperandInfos with isPredicate() property.
3386 if (NumOpsRemaining >= 2 &&
3387 OpInfo[Idx].isPredicate() && OpInfo[Idx+1].isPredicate() &&
3388 OpInfo[Idx].RegClass < 0 &&
3389 OpInfo[Idx+1].RegClass == ARM::CCRRegClassID)
3391 // If we are inside an IT block, get the IT condition bits maintained via
3392 // ARMBasicMCBuilder::ITState[7:0], through ARMBasicMCBuilder::GetITCond().
3395 MI.addOperand(MCOperand::CreateImm(GetITCond()));
3397 MI.addOperand(MCOperand::CreateImm(ARMCC::AL));
3398 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
3405 /// TryPredicateAndSBitModifier - TryPredicateAndSBitModifier tries to process
3406 /// the possible Predicate and SBitModifier, to build the remaining MCOperand
3408 bool ARMBasicMCBuilder::TryPredicateAndSBitModifier(MCInst& MI, unsigned Opcode,
3409 uint32_t insn, unsigned short NumOpsRemaining) {
3411 assert(NumOpsRemaining > 0 && "Invalid argument");
3413 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3414 const std::string &Name = ARMInsts[Opcode].Name;
3415 unsigned Idx = MI.getNumOperands();
3416 uint64_t TSFlags = ARMInsts[Opcode].TSFlags;
3418 // First, we check whether this instr specifies the PredicateOperand through
3419 // a pair of TargetOperandInfos with isPredicate() property.
3420 if (NumOpsRemaining >= 2 &&
3421 OpInfo[Idx].isPredicate() && OpInfo[Idx+1].isPredicate() &&
3422 OpInfo[Idx].RegClass < 0 &&
3423 OpInfo[Idx+1].RegClass == ARM::CCRRegClassID)
3425 // If we are inside an IT block, get the IT condition bits maintained via
3426 // ARMBasicMCBuilder::ITState[7:0], through ARMBasicMCBuilder::GetITCond().
3429 MI.addOperand(MCOperand::CreateImm(GetITCond()));
3431 if (Name.length() > 1 && Name[0] == 't') {
3432 // Thumb conditional branch instructions have their cond field embedded,
3436 if (Name == "t2Bcc")
3437 MI.addOperand(MCOperand::CreateImm(CondCode(slice(insn, 25, 22))));
3438 else if (Name == "tBcc")
3439 MI.addOperand(MCOperand::CreateImm(CondCode(slice(insn, 11, 8))));
3441 MI.addOperand(MCOperand::CreateImm(ARMCC::AL));
3443 // ARM instructions get their condition field from Inst{31-28}.
3444 // We should reject Inst{31-28} = 0b1111 as invalid encoding.
3445 if (!isNEONDomain(TSFlags) && getCondField(insn) == 0xF)
3447 MI.addOperand(MCOperand::CreateImm(CondCode(getCondField(insn))));
3450 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
3452 NumOpsRemaining -= 2;
3455 if (NumOpsRemaining == 0)
3458 // Next, if OptionalDefOperand exists, we check whether the 'S' bit is set.
3459 if (OpInfo[Idx].isOptionalDef() && OpInfo[Idx].RegClass==ARM::CCRRegClassID) {
3460 MI.addOperand(MCOperand::CreateReg(getSBit(insn) == 1 ? ARM::CPSR : 0));
3464 if (NumOpsRemaining == 0)
3470 /// RunBuildAfterHook - RunBuildAfterHook performs operations deemed necessary
3471 /// after BuildIt is finished.
3472 bool ARMBasicMCBuilder::RunBuildAfterHook(bool Status, MCInst &MI,
3475 if (!SP) return Status;
3477 if (Opcode == ARM::t2IT)
3478 Status = SP->InitIT(slice(insn, 7, 0)) ? Status : false;
3479 else if (InITBlock())
3485 /// Opcode, Format, and NumOperands make up an ARM Basic MCBuilder.
3486 ARMBasicMCBuilder::ARMBasicMCBuilder(unsigned opc, ARMFormat format,
3488 : Opcode(opc), Format(format), NumOps(num), SP(0), Err(0) {
3489 unsigned Idx = (unsigned)format;
3490 assert(Idx < (array_lengthof(FuncPtrs) - 1) && "Unknown format");
3491 Disasm = FuncPtrs[Idx];
3494 /// CreateMCBuilder - Return an ARMBasicMCBuilder that can build up the MC
3495 /// infrastructure of an MCInst given the Opcode and Format of the instr.
3496 /// Return NULL if it fails to create/return a proper builder. API clients
3497 /// are responsible for freeing up of the allocated memory. Cacheing can be
3498 /// performed by the API clients to improve performance.
3499 ARMBasicMCBuilder *llvm::CreateMCBuilder(unsigned Opcode, ARMFormat Format) {
3500 // For "Unknown format", fail by returning a NULL pointer.
3501 if ((unsigned)Format >= (array_lengthof(FuncPtrs) - 1)) {
3502 DEBUG(errs() << "Unknown format\n");
3506 return new ARMBasicMCBuilder(Opcode, Format,
3507 ARMInsts[Opcode].getNumOperands());