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);
684 bool RtOut = (Opcode == ARM::MRC || Opcode == ARM::MRC2);
689 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
693 MI.addOperand(MCOperand::CreateImm(GetCoprocessor(insn)));
697 // Unindex if P:W = 0b00 --> _OPTION variant
698 unsigned PW = getPBit(insn) << 1 | getWBit(insn);
700 MI.addOperand(MCOperand::CreateImm(decodeRd(insn)));
702 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
707 MI.addOperand(MCOperand::CreateReg(0));
708 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
709 const TargetInstrDesc &TID = ARMInsts[Opcode];
711 (TID.TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift;
712 unsigned Offset = ARM_AM::getAM2Opc(AddrOpcode, slice(insn, 7, 0) << 2,
713 ARM_AM::no_shift, IndexMode);
714 MI.addOperand(MCOperand::CreateImm(Offset));
717 MI.addOperand(MCOperand::CreateImm(slice(insn, 7, 0)));
721 MI.addOperand(MCOperand::CreateImm(OneCopOpc ? GetCopOpc(insn)
722 : GetCopOpc1(insn, NoGPR)));
726 MI.addOperand(NoGPR ? MCOperand::CreateImm(decodeRd(insn))
727 : MCOperand::CreateReg(
728 getRegisterEnum(B, ARM::GPRRegClassID,
733 MI.addOperand(OneCopOpc ? MCOperand::CreateReg(
734 getRegisterEnum(B, ARM::GPRRegClassID,
736 : MCOperand::CreateImm(decodeRn(insn)));
738 MI.addOperand(MCOperand::CreateImm(decodeRm(insn)));
743 MI.addOperand(MCOperand::CreateImm(GetCopOpc2(insn)));
751 // Branch Instructions.
752 // BL: SignExtend(Imm24:'00', 32)
753 // Bcc, BL_pred: SignExtend(Imm24:'00', 32) Pred0 Pred1
754 // SMC: ZeroExtend(imm4, 32)
755 // SVC: ZeroExtend(Imm24, 32)
757 // Various coprocessor instructions are assigned BrFrm arbitrarily.
758 // Delegates to DisassembleCoprocessor() helper function.
761 // MSR/MSRsys: Rm mask=Inst{19-16}
763 // MSRi/MSRsysi: so_imm
764 // SRSW/SRS: ldstm_mode:$amode mode_imm
765 // RFEW/RFE: ldstm_mode:$amode Rn
766 static bool DisassembleBrFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
767 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
769 if (CoprocessorOpcode(Opcode))
770 return DisassembleCoprocessor(MI, Opcode, insn, NumOps, NumOpsAdded, B);
772 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
773 if (!OpInfo) return false;
775 // MRS and MRSsys take one GPR reg Rd.
776 if (Opcode == ARM::MRS || Opcode == ARM::MRSsys) {
777 assert(NumOps >= 1 && OpInfo[0].RegClass == ARM::GPRRegClassID &&
778 "Reg operand expected");
779 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
784 // BXJ takes one GPR reg Rm.
785 if (Opcode == ARM::BXJ) {
786 assert(NumOps >= 1 && OpInfo[0].RegClass == ARM::GPRRegClassID &&
787 "Reg operand expected");
788 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
793 // MSR take a mask, followed by one GPR reg Rm. The mask contains the R Bit in
794 // bit 4, and the special register fields in bits 3-0.
795 if (Opcode == ARM::MSR) {
796 assert(NumOps >= 1 && OpInfo[1].RegClass == ARM::GPRRegClassID &&
797 "Reg operand expected");
798 MI.addOperand(MCOperand::CreateImm(slice(insn, 22, 22) << 4 /* R Bit */ |
799 slice(insn, 19, 16) /* Special Reg */ ));
800 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
805 // MSRi take a mask, followed by one so_imm operand. The mask contains the
806 // R Bit in bit 4, and the special register fields in bits 3-0.
807 if (Opcode == ARM::MSRi) {
808 MI.addOperand(MCOperand::CreateImm(slice(insn, 22, 22) << 4 /* R Bit */ |
809 slice(insn, 19, 16) /* Special Reg */ ));
810 // SOImm is 4-bit rotate amount in bits 11-8 with 8-bit imm in bits 7-0.
811 // A5.2.4 Rotate amount is twice the numeric value of Inst{11-8}.
812 // See also ARMAddressingModes.h: getSOImmValImm() and getSOImmValRot().
813 unsigned Rot = (insn >> ARMII::SoRotImmShift) & 0xF;
814 unsigned Imm = insn & 0xFF;
815 MI.addOperand(MCOperand::CreateImm(ARM_AM::rotr32(Imm, 2*Rot)));
819 if (Opcode == ARM::SRSW || Opcode == ARM::SRS ||
820 Opcode == ARM::RFEW || Opcode == ARM::RFE) {
821 ARM_AM::AMSubMode SubMode = getAMSubModeForBits(getPUBits(insn));
822 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM4ModeImm(SubMode)));
824 if (Opcode == ARM::SRSW || Opcode == ARM::SRS)
825 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0)));
827 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
833 assert((Opcode == ARM::Bcc || Opcode == ARM::BL || Opcode == ARM::BL_pred
834 || Opcode == ARM::SMC || Opcode == ARM::SVC) &&
835 "Unexpected Opcode");
837 assert(NumOps >= 1 && OpInfo[0].RegClass < 0 && "Imm operand expected");
840 if (Opcode == ARM::SMC) {
841 // ZeroExtend(imm4, 32) where imm24 = Inst{3-0}.
842 Imm32 = slice(insn, 3, 0);
843 } else if (Opcode == ARM::SVC) {
844 // ZeroExtend(imm24, 32) where imm24 = Inst{23-0}.
845 Imm32 = slice(insn, 23, 0);
847 // SignExtend(imm24:'00', 32) where imm24 = Inst{23-0}.
848 unsigned Imm26 = slice(insn, 23, 0) << 2;
849 //Imm32 = signextend<signed int, 26>(Imm26);
850 Imm32 = SignExtend32<26>(Imm26);
853 MI.addOperand(MCOperand::CreateImm(Imm32));
859 // Misc. Branch Instructions.
862 static bool DisassembleBrMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
863 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
865 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
866 if (!OpInfo) return false;
868 unsigned &OpIdx = NumOpsAdded;
872 // BX_RET and MOVPCLR have only two predicate operands; do an early return.
873 if (Opcode == ARM::BX_RET || Opcode == ARM::MOVPCLR)
876 // BLX and BX take one GPR reg.
877 if (Opcode == ARM::BLX || Opcode == ARM::BLX_pred ||
879 assert(NumOps >= 1 && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
880 "Reg operand expected");
881 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
887 // BLXi takes imm32 (the PC offset).
888 if (Opcode == ARM::BLXi) {
889 assert(NumOps >= 1 && OpInfo[0].RegClass < 0 && "Imm operand expected");
890 // SignExtend(imm24:H:'0', 32) where imm24 = Inst{23-0} and H = Inst{24}.
891 unsigned Imm26 = slice(insn, 23, 0) << 2 | slice(insn, 24, 24) << 1;
892 int Imm32 = SignExtend32<26>(Imm26);
893 MI.addOperand(MCOperand::CreateImm(Imm32));
901 static inline bool getBFCInvMask(uint32_t insn, uint32_t &mask) {
902 uint32_t lsb = slice(insn, 11, 7);
903 uint32_t msb = slice(insn, 20, 16);
906 DEBUG(errs() << "Encoding error: msb < lsb\n");
910 for (uint32_t i = lsb; i <= msb; ++i)
916 // A major complication is the fact that some of the saturating add/subtract
917 // operations have Rd Rm Rn, instead of the "normal" Rd Rn Rm.
918 // They are QADD, QDADD, QDSUB, and QSUB.
919 static bool DisassembleDPFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
920 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
922 const TargetInstrDesc &TID = ARMInsts[Opcode];
923 unsigned short NumDefs = TID.getNumDefs();
924 bool isUnary = isUnaryDP(TID.TSFlags);
925 const TargetOperandInfo *OpInfo = TID.OpInfo;
926 unsigned &OpIdx = NumOpsAdded;
930 // Disassemble register def if there is one.
931 if (NumDefs && (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID)) {
932 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
937 // Now disassemble the src operands.
941 // Special-case handling of BFC/BFI/SBFX/UBFX.
942 if (Opcode == ARM::BFC || Opcode == ARM::BFI) {
943 MI.addOperand(MCOperand::CreateReg(0));
944 if (Opcode == ARM::BFI) {
945 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
950 if (!getBFCInvMask(insn, mask))
953 MI.addOperand(MCOperand::CreateImm(mask));
957 if (Opcode == ARM::SBFX || Opcode == ARM::UBFX) {
958 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
960 MI.addOperand(MCOperand::CreateImm(slice(insn, 11, 7)));
961 MI.addOperand(MCOperand::CreateImm(slice(insn, 20, 16) + 1));
966 bool RmRn = (Opcode == ARM::QADD || Opcode == ARM::QDADD ||
967 Opcode == ARM::QDSUB || Opcode == ARM::QSUB);
969 // BinaryDP has an Rn operand.
971 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
972 "Reg operand expected");
973 MI.addOperand(MCOperand::CreateReg(
974 getRegisterEnum(B, ARM::GPRRegClassID,
975 RmRn ? decodeRm(insn) : decodeRn(insn))));
979 // If this is a two-address operand, skip it, e.g., MOVCCr operand 1.
980 if (isUnary && (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)) {
981 MI.addOperand(MCOperand::CreateReg(0));
985 // Now disassemble operand 2.
989 if (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) {
990 // We have a reg/reg form.
991 // Assert disabled because saturating operations, e.g., A8.6.127 QASX, are
992 // routed here as well.
993 // assert(getIBit(insn) == 0 && "I_Bit != '0' reg/reg form");
994 MI.addOperand(MCOperand::CreateReg(
995 getRegisterEnum(B, ARM::GPRRegClassID,
996 RmRn? decodeRn(insn) : decodeRm(insn))));
998 } else if (Opcode == ARM::MOVi16 || Opcode == ARM::MOVTi16) {
999 // We have an imm16 = imm4:imm12 (imm4=Inst{19:16}, imm12 = Inst{11:0}).
1000 assert(getIBit(insn) == 1 && "I_Bit != '1' reg/imm form");
1001 unsigned Imm16 = slice(insn, 19, 16) << 12 | slice(insn, 11, 0);
1002 MI.addOperand(MCOperand::CreateImm(Imm16));
1005 // We have a reg/imm form.
1006 // SOImm is 4-bit rotate amount in bits 11-8 with 8-bit imm in bits 7-0.
1007 // A5.2.4 Rotate amount is twice the numeric value of Inst{11-8}.
1008 // See also ARMAddressingModes.h: getSOImmValImm() and getSOImmValRot().
1009 assert(getIBit(insn) == 1 && "I_Bit != '1' reg/imm form");
1010 unsigned Rot = (insn >> ARMII::SoRotImmShift) & 0xF;
1011 unsigned Imm = insn & 0xFF;
1012 MI.addOperand(MCOperand::CreateImm(ARM_AM::rotr32(Imm, 2*Rot)));
1019 static bool DisassembleDPSoRegFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1020 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1022 const TargetInstrDesc &TID = ARMInsts[Opcode];
1023 unsigned short NumDefs = TID.getNumDefs();
1024 bool isUnary = isUnaryDP(TID.TSFlags);
1025 const TargetOperandInfo *OpInfo = TID.OpInfo;
1026 unsigned &OpIdx = NumOpsAdded;
1030 // Disassemble register def if there is one.
1031 if (NumDefs && (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID)) {
1032 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1037 // Disassemble the src operands.
1038 if (OpIdx >= NumOps)
1041 // BinaryDP has an Rn operand.
1043 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1044 "Reg operand expected");
1045 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1050 // If this is a two-address operand, skip it, e.g., MOVCCs operand 1.
1051 if (isUnary && (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)) {
1052 MI.addOperand(MCOperand::CreateReg(0));
1056 // Disassemble operand 2, which consists of three components.
1057 if (OpIdx + 2 >= NumOps)
1060 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
1061 (OpInfo[OpIdx+1].RegClass == ARM::GPRRegClassID) &&
1062 (OpInfo[OpIdx+2].RegClass < 0) &&
1063 "Expect 3 reg operands");
1065 // Register-controlled shifts have Inst{7} = 0 and Inst{4} = 1.
1066 unsigned Rs = slice(insn, 4, 4);
1068 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1071 // Register-controlled shifts: [Rm, Rs, shift].
1072 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1074 // Inst{6-5} encodes the shift opcode.
1075 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1076 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(ShOp, 0)));
1078 // Constant shifts: [Rm, reg0, shift_imm].
1079 MI.addOperand(MCOperand::CreateReg(0)); // NoRegister
1080 // Inst{6-5} encodes the shift opcode.
1081 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1082 // Inst{11-7} encodes the imm5 shift amount.
1083 unsigned ShImm = slice(insn, 11, 7);
1085 // A8.4.1. Possible rrx or shift amount of 32...
1086 getImmShiftSE(ShOp, ShImm);
1087 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(ShOp, ShImm)));
1094 static bool DisassembleLdStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1095 unsigned short NumOps, unsigned &NumOpsAdded, bool isStore, BO B) {
1097 const TargetInstrDesc &TID = ARMInsts[Opcode];
1098 bool isPrePost = isPrePostLdSt(TID.TSFlags);
1099 const TargetOperandInfo *OpInfo = TID.OpInfo;
1100 if (!OpInfo) return false;
1102 unsigned &OpIdx = NumOpsAdded;
1106 assert(((!isStore && TID.getNumDefs() > 0) ||
1107 (isStore && (TID.getNumDefs() == 0 || isPrePost)))
1108 && "Invalid arguments");
1110 // Operand 0 of a pre- and post-indexed store is the address base writeback.
1111 if (isPrePost && isStore) {
1112 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1113 "Reg operand expected");
1114 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1119 // Disassemble the dst/src operand.
1120 if (OpIdx >= NumOps)
1123 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1124 "Reg operand expected");
1125 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1129 // After dst of a pre- and post-indexed load is the address base writeback.
1130 if (isPrePost && !isStore) {
1131 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1132 "Reg operand expected");
1133 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1138 // Disassemble the base operand.
1139 if (OpIdx >= NumOps)
1142 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1143 "Reg operand expected");
1144 assert((!isPrePost || (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1))
1145 && "Index mode or tied_to operand expected");
1146 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1150 // For reg/reg form, base reg is followed by +/- reg shop imm.
1151 // For immediate form, it is followed by +/- imm12.
1152 // See also ARMAddressingModes.h (Addressing Mode #2).
1153 if (OpIdx + 1 >= NumOps)
1156 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1157 unsigned IndexMode =
1158 (TID.TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift;
1159 if (getIBit(insn) == 0) {
1160 // For pre- and post-indexed case, add a reg0 operand (Addressing Mode #2).
1161 // Otherwise, skip the reg operand since for addrmode_imm12, Rn has already
1164 MI.addOperand(MCOperand::CreateReg(0));
1168 unsigned Imm12 = slice(insn, 11, 0);
1169 if (Opcode == ARM::LDRBi12 || Opcode == ARM::LDRi12 ||
1170 Opcode == ARM::STRBi12 || Opcode == ARM::STRi12) {
1171 // Disassemble the 12-bit immediate offset, which is the second operand in
1172 // $addrmode_imm12 => (ops GPR:$base, i32imm:$offsimm).
1173 int Offset = AddrOpcode == ARM_AM::add ? 1 * Imm12 : -1 * Imm12;
1174 MI.addOperand(MCOperand::CreateImm(Offset));
1176 // Disassemble the 12-bit immediate offset, which is the second operand in
1177 // $am2offset => (ops GPR, i32imm).
1178 unsigned Offset = ARM_AM::getAM2Opc(AddrOpcode, Imm12, ARM_AM::no_shift,
1180 MI.addOperand(MCOperand::CreateImm(Offset));
1184 // The opcode ARM::LDRT actually corresponds to both Encoding A1 and A2 of
1185 // A8.6.86 LDRT. So if Inst{4} != 0 while Inst{25} (getIBit(insn)) == 1,
1186 // we should reject this insn as invalid.
1189 if ((Opcode == ARM::LDRT || Opcode == ARM::LDRBT) && (slice(insn,4,4) == 1))
1192 // Disassemble the offset reg (Rm), shift type, and immediate shift length.
1193 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1195 // Inst{6-5} encodes the shift opcode.
1196 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
1197 // Inst{11-7} encodes the imm5 shift amount.
1198 unsigned ShImm = slice(insn, 11, 7);
1200 // A8.4.1. Possible rrx or shift amount of 32...
1201 getImmShiftSE(ShOp, ShImm);
1202 MI.addOperand(MCOperand::CreateImm(
1203 ARM_AM::getAM2Opc(AddrOpcode, ShImm, ShOp, IndexMode)));
1210 static bool DisassembleLdFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1211 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1212 return DisassembleLdStFrm(MI, Opcode, insn, NumOps, NumOpsAdded, false, B);
1215 static bool DisassembleStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1216 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1217 return DisassembleLdStFrm(MI, Opcode, insn, NumOps, NumOpsAdded, true, B);
1220 static bool HasDualReg(unsigned Opcode) {
1224 case ARM::LDRD: case ARM::LDRD_PRE: case ARM::LDRD_POST:
1225 case ARM::STRD: case ARM::STRD_PRE: case ARM::STRD_POST:
1230 static bool DisassembleLdStMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1231 unsigned short NumOps, unsigned &NumOpsAdded, bool isStore, BO B) {
1233 const TargetInstrDesc &TID = ARMInsts[Opcode];
1234 bool isPrePost = isPrePostLdSt(TID.TSFlags);
1235 const TargetOperandInfo *OpInfo = TID.OpInfo;
1236 if (!OpInfo) return false;
1238 unsigned &OpIdx = NumOpsAdded;
1242 assert(((!isStore && TID.getNumDefs() > 0) ||
1243 (isStore && (TID.getNumDefs() == 0 || isPrePost)))
1244 && "Invalid arguments");
1246 // Operand 0 of a pre- and post-indexed store is the address base writeback.
1247 if (isPrePost && isStore) {
1248 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1249 "Reg operand expected");
1250 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1255 // Disassemble the dst/src operand.
1256 if (OpIdx >= NumOps)
1259 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1260 "Reg operand expected");
1261 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1265 // Fill in LDRD and STRD's second operand Rt operand.
1266 if (HasDualReg(Opcode)) {
1267 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1268 decodeRd(insn) + 1)));
1272 // After dst of a pre- and post-indexed load is the address base writeback.
1273 if (isPrePost && !isStore) {
1274 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1275 "Reg operand expected");
1276 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1281 // Disassemble the base operand.
1282 if (OpIdx >= NumOps)
1285 assert(OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
1286 "Reg operand expected");
1287 assert((!isPrePost || (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1))
1288 && "Offset mode or tied_to operand expected");
1289 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1293 // For reg/reg form, base reg is followed by +/- reg.
1294 // For immediate form, it is followed by +/- imm8.
1295 // See also ARMAddressingModes.h (Addressing Mode #3).
1296 if (OpIdx + 1 >= NumOps)
1299 assert((OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) &&
1300 (OpInfo[OpIdx+1].RegClass < 0) &&
1301 "Expect 1 reg operand followed by 1 imm operand");
1303 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1304 unsigned IndexMode =
1305 (TID.TSFlags & ARMII::IndexModeMask) >> ARMII::IndexModeShift;
1306 if (getAM3IBit(insn) == 1) {
1307 MI.addOperand(MCOperand::CreateReg(0));
1309 // Disassemble the 8-bit immediate offset.
1310 unsigned Imm4H = (insn >> ARMII::ImmHiShift) & 0xF;
1311 unsigned Imm4L = insn & 0xF;
1312 unsigned Offset = ARM_AM::getAM3Opc(AddrOpcode, (Imm4H << 4) | Imm4L,
1314 MI.addOperand(MCOperand::CreateImm(Offset));
1316 // Disassemble the offset reg (Rm).
1317 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1319 unsigned Offset = ARM_AM::getAM3Opc(AddrOpcode, 0, IndexMode);
1320 MI.addOperand(MCOperand::CreateImm(Offset));
1327 static bool DisassembleLdMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1328 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1329 return DisassembleLdStMiscFrm(MI, Opcode, insn, NumOps, NumOpsAdded, false,
1333 static bool DisassembleStMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1334 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1335 return DisassembleLdStMiscFrm(MI, Opcode, insn, NumOps, NumOpsAdded, true, B);
1338 // The algorithm for disassembly of LdStMulFrm is different from others because
1339 // it explicitly populates the two predicate operands after the base register.
1340 // After that, we need to populate the reglist with each affected register
1341 // encoded as an MCOperand.
1342 static bool DisassembleLdStMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1343 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1345 assert(NumOps >= 4 && "LdStMulFrm expects NumOps >= 4");
1348 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1350 // Writeback to base, if necessary.
1351 if (Opcode == ARM::LDMIA_UPD || Opcode == ARM::STMIA_UPD ||
1352 Opcode == ARM::LDMDA_UPD || Opcode == ARM::STMDA_UPD ||
1353 Opcode == ARM::LDMDB_UPD || Opcode == ARM::STMDB_UPD ||
1354 Opcode == ARM::LDMIB_UPD || Opcode == ARM::STMIB_UPD) {
1355 MI.addOperand(MCOperand::CreateReg(Base));
1359 // Add the base register operand.
1360 MI.addOperand(MCOperand::CreateReg(Base));
1362 // Handling the two predicate operands before the reglist.
1363 int64_t CondVal = getCondField(insn);
1366 MI.addOperand(MCOperand::CreateImm(CondVal));
1367 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
1371 // Fill the variadic part of reglist.
1372 unsigned RegListBits = insn & ((1 << 16) - 1);
1373 for (unsigned i = 0; i < 16; ++i) {
1374 if ((RegListBits >> i) & 1) {
1375 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1384 // LDREX, LDREXB, LDREXH: Rd Rn
1385 // LDREXD: Rd Rd+1 Rn
1386 // STREX, STREXB, STREXH: Rd Rm Rn
1387 // STREXD: Rd Rm Rm+1 Rn
1389 // SWP, SWPB: Rd Rm Rn
1390 static bool DisassembleLdStExFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1391 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1393 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1394 if (!OpInfo) return false;
1396 unsigned &OpIdx = NumOpsAdded;
1401 && OpInfo[0].RegClass == ARM::GPRRegClassID
1402 && OpInfo[1].RegClass == ARM::GPRRegClassID
1403 && "Expect 2 reg operands");
1405 bool isStore = slice(insn, 20, 20) == 0;
1406 bool isDW = (Opcode == ARM::LDREXD || Opcode == ARM::STREXD);
1408 // Add the destination operand.
1409 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1413 // Store register Exclusive needs a source operand.
1415 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1420 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1421 decodeRm(insn)+1)));
1425 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1426 decodeRd(insn)+1)));
1430 // Finally add the pointer operand.
1431 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1438 // Misc. Arithmetic Instructions.
1440 // PKHBT, PKHTB: Rd Rn Rm , LSL/ASR #imm5
1441 // RBIT, REV, REV16, REVSH: Rd Rm
1442 static bool DisassembleArithMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1443 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1445 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1446 unsigned &OpIdx = NumOpsAdded;
1451 && OpInfo[0].RegClass == ARM::GPRRegClassID
1452 && OpInfo[1].RegClass == ARM::GPRRegClassID
1453 && "Expect 2 reg operands");
1455 bool ThreeReg = NumOps > 2 && OpInfo[2].RegClass == ARM::GPRRegClassID;
1457 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1462 assert(NumOps >= 4 && "Expect >= 4 operands");
1463 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1468 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1472 // If there is still an operand info left which is an immediate operand, add
1473 // an additional imm5 LSL/ASR operand.
1474 if (ThreeReg && OpInfo[OpIdx].RegClass < 0
1475 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1476 // Extract the 5-bit immediate field Inst{11-7}.
1477 unsigned ShiftAmt = (insn >> ARMII::ShiftShift) & 0x1F;
1478 ARM_AM::ShiftOpc Opc = ARM_AM::no_shift;
1479 if (Opcode == ARM::PKHBT)
1481 else if (Opcode == ARM::PKHBT)
1483 getImmShiftSE(Opc, ShiftAmt);
1484 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(Opc, ShiftAmt)));
1491 /// DisassembleSatFrm - Disassemble saturate instructions:
1492 /// SSAT, SSAT16, USAT, and USAT16.
1493 static bool DisassembleSatFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1494 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1496 const TargetInstrDesc &TID = ARMInsts[Opcode];
1497 NumOpsAdded = TID.getNumOperands() - 2; // ignore predicate operands
1499 // Disassemble register def.
1500 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1503 unsigned Pos = slice(insn, 20, 16);
1504 if (Opcode == ARM::SSAT || Opcode == ARM::SSAT16)
1506 MI.addOperand(MCOperand::CreateImm(Pos));
1508 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1511 if (NumOpsAdded == 4) {
1512 ARM_AM::ShiftOpc Opc = (slice(insn, 6, 6) != 0 ? ARM_AM::asr : ARM_AM::lsl);
1513 // Inst{11-7} encodes the imm5 shift amount.
1514 unsigned ShAmt = slice(insn, 11, 7);
1516 // A8.6.183. Possible ASR shift amount of 32...
1517 if (Opc == ARM_AM::asr)
1520 Opc = ARM_AM::no_shift;
1522 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(Opc, ShAmt)));
1527 // Extend instructions.
1528 // SXT* and UXT*: Rd [Rn] Rm [rot_imm].
1529 // The 2nd operand register is Rn and the 3rd operand regsiter is Rm for the
1530 // three register operand form. Otherwise, Rn=0b1111 and only Rm is used.
1531 static bool DisassembleExtFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1532 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1534 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1535 unsigned &OpIdx = NumOpsAdded;
1540 && OpInfo[0].RegClass == ARM::GPRRegClassID
1541 && OpInfo[1].RegClass == ARM::GPRRegClassID
1542 && "Expect 2 reg operands");
1544 bool ThreeReg = NumOps > 2 && OpInfo[2].RegClass == ARM::GPRRegClassID;
1546 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1551 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1556 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1560 // If there is still an operand info left which is an immediate operand, add
1561 // an additional rotate immediate operand.
1562 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
1563 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1564 // Extract the 2-bit rotate field Inst{11-10}.
1565 unsigned rot = (insn >> ARMII::ExtRotImmShift) & 3;
1566 // Rotation by 8, 16, or 24 bits.
1567 MI.addOperand(MCOperand::CreateImm(rot << 3));
1574 /////////////////////////////////////
1576 // Utility Functions For VFP //
1578 /////////////////////////////////////
1580 // Extract/Decode Dd/Sd:
1582 // SP => d = UInt(Vd:D)
1583 // DP => d = UInt(D:Vd)
1584 static unsigned decodeVFPRd(uint32_t insn, bool isSPVFP) {
1585 return isSPVFP ? (decodeRd(insn) << 1 | getDBit(insn))
1586 : (decodeRd(insn) | getDBit(insn) << 4);
1589 // Extract/Decode Dn/Sn:
1591 // SP => n = UInt(Vn:N)
1592 // DP => n = UInt(N:Vn)
1593 static unsigned decodeVFPRn(uint32_t insn, bool isSPVFP) {
1594 return isSPVFP ? (decodeRn(insn) << 1 | getNBit(insn))
1595 : (decodeRn(insn) | getNBit(insn) << 4);
1598 // Extract/Decode Dm/Sm:
1600 // SP => m = UInt(Vm:M)
1601 // DP => m = UInt(M:Vm)
1602 static unsigned decodeVFPRm(uint32_t insn, bool isSPVFP) {
1603 return isSPVFP ? (decodeRm(insn) << 1 | getMBit(insn))
1604 : (decodeRm(insn) | getMBit(insn) << 4);
1608 static APInt VFPExpandImm(unsigned char byte, unsigned N) {
1609 assert(N == 32 || N == 64);
1612 unsigned bit6 = slice(byte, 6, 6);
1614 Result = slice(byte, 7, 7) << 31 | slice(byte, 5, 0) << 19;
1616 Result |= 0x1f << 25;
1618 Result |= 0x1 << 30;
1620 Result = (uint64_t)slice(byte, 7, 7) << 63 |
1621 (uint64_t)slice(byte, 5, 0) << 48;
1623 Result |= 0xffULL << 54;
1625 Result |= 0x1ULL << 62;
1627 return APInt(N, Result);
1630 // VFP Unary Format Instructions:
1632 // VCMP[E]ZD, VCMP[E]ZS: compares one floating-point register with zero
1633 // VCVTDS, VCVTSD: converts between double-precision and single-precision
1634 // The rest of the instructions have homogeneous [VFP]Rd and [VFP]Rm registers.
1635 static bool DisassembleVFPUnaryFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1636 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1638 assert(NumOps >= 1 && "VFPUnaryFrm expects NumOps >= 1");
1640 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1641 unsigned &OpIdx = NumOpsAdded;
1645 unsigned RegClass = OpInfo[OpIdx].RegClass;
1646 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1647 "Reg operand expected");
1648 bool isSP = (RegClass == ARM::SPRRegClassID);
1650 MI.addOperand(MCOperand::CreateReg(
1651 getRegisterEnum(B, RegClass, decodeVFPRd(insn, isSP))));
1654 // Early return for compare with zero instructions.
1655 if (Opcode == ARM::VCMPEZD || Opcode == ARM::VCMPEZS
1656 || Opcode == ARM::VCMPZD || Opcode == ARM::VCMPZS)
1659 RegClass = OpInfo[OpIdx].RegClass;
1660 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1661 "Reg operand expected");
1662 isSP = (RegClass == ARM::SPRRegClassID);
1664 MI.addOperand(MCOperand::CreateReg(
1665 getRegisterEnum(B, RegClass, decodeVFPRm(insn, isSP))));
1671 // All the instructions have homogeneous [VFP]Rd, [VFP]Rn, and [VFP]Rm regs.
1672 // Some of them have operand constraints which tie the first operand in the
1673 // InOperandList to that of the dst. As far as asm printing is concerned, this
1674 // tied_to operand is simply skipped.
1675 static bool DisassembleVFPBinaryFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1676 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1678 assert(NumOps >= 3 && "VFPBinaryFrm expects NumOps >= 3");
1680 const TargetInstrDesc &TID = ARMInsts[Opcode];
1681 const TargetOperandInfo *OpInfo = TID.OpInfo;
1682 unsigned &OpIdx = NumOpsAdded;
1686 unsigned RegClass = OpInfo[OpIdx].RegClass;
1687 assert((RegClass == ARM::SPRRegClassID || RegClass == ARM::DPRRegClassID) &&
1688 "Reg operand expected");
1689 bool isSP = (RegClass == ARM::SPRRegClassID);
1691 MI.addOperand(MCOperand::CreateReg(
1692 getRegisterEnum(B, RegClass, decodeVFPRd(insn, isSP))));
1695 // Skip tied_to operand constraint.
1696 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
1697 assert(NumOps >= 4 && "Expect >=4 operands");
1698 MI.addOperand(MCOperand::CreateReg(0));
1702 MI.addOperand(MCOperand::CreateReg(
1703 getRegisterEnum(B, RegClass, decodeVFPRn(insn, isSP))));
1706 MI.addOperand(MCOperand::CreateReg(
1707 getRegisterEnum(B, RegClass, decodeVFPRm(insn, isSP))));
1713 // A8.6.295 vcvt (floating-point <-> integer)
1714 // Int to FP: VSITOD, VSITOS, VUITOD, VUITOS
1715 // FP to Int: VTOSI[Z|R]D, VTOSI[Z|R]S, VTOUI[Z|R]D, VTOUI[Z|R]S
1717 // A8.6.297 vcvt (floating-point and fixed-point)
1718 // Dd|Sd Dd|Sd(TIED_TO) #fbits(= 16|32 - UInt(imm4:i))
1719 static bool DisassembleVFPConv1Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1720 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1722 assert(NumOps >= 2 && "VFPConv1Frm expects NumOps >= 2");
1724 const TargetInstrDesc &TID = ARMInsts[Opcode];
1725 const TargetOperandInfo *OpInfo = TID.OpInfo;
1726 if (!OpInfo) return false;
1728 bool SP = slice(insn, 8, 8) == 0; // A8.6.295 & A8.6.297
1729 bool fixed_point = slice(insn, 17, 17) == 1; // A8.6.297
1730 unsigned RegClassID = SP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1734 assert(NumOps >= 3 && "Expect >= 3 operands");
1735 int size = slice(insn, 7, 7) == 0 ? 16 : 32;
1736 int fbits = size - (slice(insn,3,0) << 1 | slice(insn,5,5));
1737 MI.addOperand(MCOperand::CreateReg(
1738 getRegisterEnum(B, RegClassID,
1739 decodeVFPRd(insn, SP))));
1741 assert(TID.getOperandConstraint(1, TOI::TIED_TO) != -1 &&
1742 "Tied to operand expected");
1743 MI.addOperand(MI.getOperand(0));
1745 assert(OpInfo[2].RegClass < 0 && !OpInfo[2].isPredicate() &&
1746 !OpInfo[2].isOptionalDef() && "Imm operand expected");
1747 MI.addOperand(MCOperand::CreateImm(fbits));
1752 // The Rd (destination) and Rm (source) bits have different interpretations
1753 // depending on their single-precisonness.
1755 if (slice(insn, 18, 18) == 1) { // to_integer operation
1756 d = decodeVFPRd(insn, true /* Is Single Precision */);
1757 MI.addOperand(MCOperand::CreateReg(
1758 getRegisterEnum(B, ARM::SPRRegClassID, d)));
1759 m = decodeVFPRm(insn, SP);
1760 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, m)));
1762 d = decodeVFPRd(insn, SP);
1763 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, d)));
1764 m = decodeVFPRm(insn, true /* Is Single Precision */);
1765 MI.addOperand(MCOperand::CreateReg(
1766 getRegisterEnum(B, ARM::SPRRegClassID, m)));
1774 // VMOVRS - A8.6.330
1775 // Rt => Rd; Sn => UInt(Vn:N)
1776 static bool DisassembleVFPConv2Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1777 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1779 assert(NumOps >= 2 && "VFPConv2Frm expects NumOps >= 2");
1781 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1783 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1784 decodeVFPRn(insn, true))));
1789 // VMOVRRD - A8.6.332
1790 // Rt => Rd; Rt2 => Rn; Dm => UInt(M:Vm)
1792 // VMOVRRS - A8.6.331
1793 // Rt => Rd; Rt2 => Rn; Sm => UInt(Vm:M); Sm1 = Sm+1
1794 static bool DisassembleVFPConv3Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1795 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1797 assert(NumOps >= 3 && "VFPConv3Frm expects NumOps >= 3");
1799 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1800 unsigned &OpIdx = NumOpsAdded;
1802 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1804 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1808 if (OpInfo[OpIdx].RegClass == ARM::SPRRegClassID) {
1809 unsigned Sm = decodeVFPRm(insn, true);
1810 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1812 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1816 MI.addOperand(MCOperand::CreateReg(
1817 getRegisterEnum(B, ARM::DPRRegClassID,
1818 decodeVFPRm(insn, false))));
1824 // VMOVSR - A8.6.330
1825 // Rt => Rd; Sn => UInt(Vn:N)
1826 static bool DisassembleVFPConv4Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1827 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1829 assert(NumOps >= 2 && "VFPConv4Frm expects NumOps >= 2");
1831 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1832 decodeVFPRn(insn, true))));
1833 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1839 // VMOVDRR - A8.6.332
1840 // Rt => Rd; Rt2 => Rn; Dm => UInt(M:Vm)
1842 // VMOVRRS - A8.6.331
1843 // Rt => Rd; Rt2 => Rn; Sm => UInt(Vm:M); Sm1 = Sm+1
1844 static bool DisassembleVFPConv5Frm(MCInst &MI, unsigned Opcode, uint32_t insn,
1845 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1847 assert(NumOps >= 3 && "VFPConv5Frm expects NumOps >= 3");
1849 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1850 unsigned &OpIdx = NumOpsAdded;
1854 if (OpInfo[OpIdx].RegClass == ARM::SPRRegClassID) {
1855 unsigned Sm = decodeVFPRm(insn, true);
1856 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1858 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::SPRRegClassID,
1862 MI.addOperand(MCOperand::CreateReg(
1863 getRegisterEnum(B, ARM::DPRRegClassID,
1864 decodeVFPRm(insn, false))));
1868 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1870 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1876 // VFP Load/Store Instructions.
1877 // VLDRD, VLDRS, VSTRD, VSTRS
1878 static bool DisassembleVFPLdStFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1879 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1881 assert(NumOps >= 3 && "VFPLdStFrm expects NumOps >= 3");
1883 bool isSPVFP = (Opcode == ARM::VLDRS || Opcode == ARM::VSTRS);
1884 unsigned RegClassID = isSPVFP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1886 // Extract Dd/Sd for operand 0.
1887 unsigned RegD = decodeVFPRd(insn, isSPVFP);
1889 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID, RegD)));
1891 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1892 MI.addOperand(MCOperand::CreateReg(Base));
1894 // Next comes the AM5 Opcode.
1895 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
1896 unsigned char Imm8 = insn & 0xFF;
1897 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM5Opc(AddrOpcode, Imm8)));
1904 // VFP Load/Store Multiple Instructions.
1905 // We have an optional write back reg, the base, and two predicate operands.
1906 // It is then followed by a reglist of either DPR(s) or SPR(s).
1908 // VLDMD[_UPD], VLDMS[_UPD], VSTMD[_UPD], VSTMS[_UPD]
1909 static bool DisassembleVFPLdStMulFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1910 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1912 assert(NumOps >= 4 && "VFPLdStMulFrm expects NumOps >= 4");
1914 unsigned &OpIdx = NumOpsAdded;
1918 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1920 // Writeback to base, if necessary.
1921 if (Opcode == ARM::VLDMDIA_UPD || Opcode == ARM::VLDMSIA_UPD ||
1922 Opcode == ARM::VLDMDDB_UPD || Opcode == ARM::VLDMSDB_UPD ||
1923 Opcode == ARM::VSTMDIA_UPD || Opcode == ARM::VSTMSIA_UPD ||
1924 Opcode == ARM::VSTMDDB_UPD || Opcode == ARM::VSTMSDB_UPD) {
1925 MI.addOperand(MCOperand::CreateReg(Base));
1929 MI.addOperand(MCOperand::CreateReg(Base));
1931 // Handling the two predicate operands before the reglist.
1932 int64_t CondVal = getCondField(insn);
1935 MI.addOperand(MCOperand::CreateImm(CondVal));
1936 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
1940 bool isSPVFP = (Opcode == ARM::VLDMSIA ||
1941 Opcode == ARM::VLDMSIA_UPD || Opcode == ARM::VLDMSDB_UPD ||
1942 Opcode == ARM::VSTMSIA ||
1943 Opcode == ARM::VSTMSIA_UPD || Opcode == ARM::VSTMSDB_UPD);
1944 unsigned RegClassID = isSPVFP ? ARM::SPRRegClassID : ARM::DPRRegClassID;
1947 unsigned RegD = decodeVFPRd(insn, isSPVFP);
1949 // Fill the variadic part of reglist.
1950 unsigned char Imm8 = insn & 0xFF;
1951 unsigned Regs = isSPVFP ? Imm8 : Imm8/2;
1953 // Apply some sanity checks before proceeding.
1954 if (Regs == 0 || (RegD + Regs) > 32 || (!isSPVFP && Regs > 16))
1957 for (unsigned i = 0; i < Regs; ++i) {
1958 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClassID,
1966 // Misc. VFP Instructions.
1967 // FMSTAT (vmrs with Rt=0b1111, i.e., to apsr_nzcv and no register operand)
1968 // FCONSTD (DPR and a VFPf64Imm operand)
1969 // FCONSTS (SPR and a VFPf32Imm operand)
1970 // VMRS/VMSR (GPR operand)
1971 static bool DisassembleVFPMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
1972 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1974 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1975 unsigned &OpIdx = NumOpsAdded;
1979 if (Opcode == ARM::FMSTAT)
1982 assert(NumOps >= 2 && "VFPMiscFrm expects >=2 operands");
1984 unsigned RegEnum = 0;
1985 switch (OpInfo[0].RegClass) {
1986 case ARM::DPRRegClassID:
1987 RegEnum = getRegisterEnum(B, ARM::DPRRegClassID, decodeVFPRd(insn, false));
1989 case ARM::SPRRegClassID:
1990 RegEnum = getRegisterEnum(B, ARM::SPRRegClassID, decodeVFPRd(insn, true));
1992 case ARM::GPRRegClassID:
1993 RegEnum = getRegisterEnum(B, ARM::GPRRegClassID, decodeRd(insn));
1996 assert(0 && "Invalid reg class id");
2000 MI.addOperand(MCOperand::CreateReg(RegEnum));
2003 // Extract/decode the f64/f32 immediate.
2004 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2005 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2006 // The asm syntax specifies the floating point value, not the 8-bit literal.
2007 APInt immRaw = VFPExpandImm(slice(insn,19,16) << 4 | slice(insn, 3, 0),
2008 Opcode == ARM::FCONSTD ? 64 : 32);
2009 APFloat immFP = APFloat(immRaw, true);
2010 double imm = Opcode == ARM::FCONSTD ? immFP.convertToDouble() :
2011 immFP.convertToFloat();
2012 MI.addOperand(MCOperand::CreateFPImm(imm));
2020 // DisassembleThumbFrm() is defined in ThumbDisassemblerCore.h file.
2021 #include "ThumbDisassemblerCore.h"
2023 /////////////////////////////////////////////////////
2025 // Utility Functions For ARM Advanced SIMD //
2027 /////////////////////////////////////////////////////
2029 // The following NEON namings are based on A8.6.266 VABA, VABAL. Notice that
2030 // A8.6.303 VDUP (ARM core register)'s D/Vd pair is the N/Vn pair of VABA/VABAL.
2032 // A7.3 Register encoding
2034 // Extract/Decode NEON D/Vd:
2036 // Note that for quadword, Qd = UInt(D:Vd<3:1>) = Inst{22:15-13}, whereas for
2037 // doubleword, Dd = UInt(D:Vd). We compensate for this difference by
2038 // handling it in the getRegisterEnum() utility function.
2039 // D = Inst{22}, Vd = Inst{15-12}
2040 static unsigned decodeNEONRd(uint32_t insn) {
2041 return ((insn >> ARMII::NEON_D_BitShift) & 1) << 4
2042 | ((insn >> ARMII::NEON_RegRdShift) & ARMII::NEONRegMask);
2045 // Extract/Decode NEON N/Vn:
2047 // Note that for quadword, Qn = UInt(N:Vn<3:1>) = Inst{7:19-17}, whereas for
2048 // doubleword, Dn = UInt(N:Vn). We compensate for this difference by
2049 // handling it in the getRegisterEnum() utility function.
2050 // N = Inst{7}, Vn = Inst{19-16}
2051 static unsigned decodeNEONRn(uint32_t insn) {
2052 return ((insn >> ARMII::NEON_N_BitShift) & 1) << 4
2053 | ((insn >> ARMII::NEON_RegRnShift) & ARMII::NEONRegMask);
2056 // Extract/Decode NEON M/Vm:
2058 // Note that for quadword, Qm = UInt(M:Vm<3:1>) = Inst{5:3-1}, whereas for
2059 // doubleword, Dm = UInt(M:Vm). We compensate for this difference by
2060 // handling it in the getRegisterEnum() utility function.
2061 // M = Inst{5}, Vm = Inst{3-0}
2062 static unsigned decodeNEONRm(uint32_t insn) {
2063 return ((insn >> ARMII::NEON_M_BitShift) & 1) << 4
2064 | ((insn >> ARMII::NEON_RegRmShift) & ARMII::NEONRegMask);
2075 } // End of unnamed namespace
2077 // size field -> Inst{11-10}
2078 // index_align field -> Inst{7-4}
2080 // The Lane Index interpretation depends on the Data Size:
2081 // 8 (encoded as size = 0b00) -> Index = index_align[3:1]
2082 // 16 (encoded as size = 0b01) -> Index = index_align[3:2]
2083 // 32 (encoded as size = 0b10) -> Index = index_align[3]
2085 // Ref: A8.6.317 VLD4 (single 4-element structure to one lane).
2086 static unsigned decodeLaneIndex(uint32_t insn) {
2087 unsigned size = insn >> 10 & 3;
2088 assert((size == 0 || size == 1 || size == 2) &&
2089 "Encoding error: size should be either 0, 1, or 2");
2091 unsigned index_align = insn >> 4 & 0xF;
2092 return (index_align >> 1) >> size;
2095 // imm64 = AdvSIMDExpandImm(op, cmode, i:imm3:imm4)
2096 // op = Inst{5}, cmode = Inst{11-8}
2097 // i = Inst{24} (ARM architecture)
2098 // imm3 = Inst{18-16}, imm4 = Inst{3-0}
2099 // Ref: Table A7-15 Modified immediate values for Advanced SIMD instructions.
2100 static uint64_t decodeN1VImm(uint32_t insn, ElemSize esize) {
2101 unsigned char op = (insn >> 5) & 1;
2102 unsigned char cmode = (insn >> 8) & 0xF;
2103 unsigned char Imm8 = ((insn >> 24) & 1) << 7 |
2104 ((insn >> 16) & 7) << 4 |
2106 return (op << 12) | (cmode << 8) | Imm8;
2109 // A8.6.339 VMUL, VMULL (by scalar)
2110 // ESize16 => m = Inst{2-0} (Vm<2:0>) D0-D7
2111 // ESize32 => m = Inst{3-0} (Vm<3:0>) D0-D15
2112 static unsigned decodeRestrictedDm(uint32_t insn, ElemSize esize) {
2119 assert(0 && "Unreachable code!");
2124 // A8.6.339 VMUL, VMULL (by scalar)
2125 // ESize16 => index = Inst{5:3} (M:Vm<3>) D0-D7
2126 // ESize32 => index = Inst{5} (M) D0-D15
2127 static unsigned decodeRestrictedDmIndex(uint32_t insn, ElemSize esize) {
2130 return (((insn >> 5) & 1) << 1) | ((insn >> 3) & 1);
2132 return (insn >> 5) & 1;
2134 assert(0 && "Unreachable code!");
2139 // A8.6.296 VCVT (between floating-point and fixed-point, Advanced SIMD)
2140 // (64 - <fbits>) is encoded as imm6, i.e., Inst{21-16}.
2141 static unsigned decodeVCVTFractionBits(uint32_t insn) {
2142 return 64 - ((insn >> 16) & 0x3F);
2145 // A8.6.302 VDUP (scalar)
2146 // ESize8 => index = Inst{19-17}
2147 // ESize16 => index = Inst{19-18}
2148 // ESize32 => index = Inst{19}
2149 static unsigned decodeNVLaneDupIndex(uint32_t insn, ElemSize esize) {
2152 return (insn >> 17) & 7;
2154 return (insn >> 18) & 3;
2156 return (insn >> 19) & 1;
2158 assert(0 && "Unspecified element size!");
2163 // A8.6.328 VMOV (ARM core register to scalar)
2164 // A8.6.329 VMOV (scalar to ARM core register)
2165 // ESize8 => index = Inst{21:6-5}
2166 // ESize16 => index = Inst{21:6}
2167 // ESize32 => index = Inst{21}
2168 static unsigned decodeNVLaneOpIndex(uint32_t insn, ElemSize esize) {
2171 return ((insn >> 21) & 1) << 2 | ((insn >> 5) & 3);
2173 return ((insn >> 21) & 1) << 1 | ((insn >> 6) & 1);
2175 return ((insn >> 21) & 1);
2177 assert(0 && "Unspecified element size!");
2182 // Imm6 = Inst{21-16}, L = Inst{7}
2184 // LeftShift == true (A8.6.367 VQSHL, A8.6.387 VSLI):
2186 // '0001xxx' => esize = 8; shift_amount = imm6 - 8
2187 // '001xxxx' => esize = 16; shift_amount = imm6 - 16
2188 // '01xxxxx' => esize = 32; shift_amount = imm6 - 32
2189 // '1xxxxxx' => esize = 64; shift_amount = imm6
2191 // LeftShift == false (A8.6.376 VRSHR, A8.6.368 VQSHRN):
2193 // '0001xxx' => esize = 8; shift_amount = 16 - imm6
2194 // '001xxxx' => esize = 16; shift_amount = 32 - imm6
2195 // '01xxxxx' => esize = 32; shift_amount = 64 - imm6
2196 // '1xxxxxx' => esize = 64; shift_amount = 64 - imm6
2198 static unsigned decodeNVSAmt(uint32_t insn, bool LeftShift) {
2199 ElemSize esize = ESizeNA;
2200 unsigned L = (insn >> 7) & 1;
2201 unsigned imm6 = (insn >> 16) & 0x3F;
2205 else if (imm6 >> 4 == 1)
2207 else if (imm6 >> 5 == 1)
2210 assert(0 && "Wrong encoding of Inst{7:21-16}!");
2215 return esize == ESize64 ? imm6 : (imm6 - esize);
2217 return esize == ESize64 ? (esize - imm6) : (2*esize - imm6);
2221 // Imm4 = Inst{11-8}
2222 static unsigned decodeN3VImm(uint32_t insn) {
2223 return (insn >> 8) & 0xF;
2227 // D[d] D[d2] ... Rn [TIED_TO Rn] align [Rm]
2229 // D[d] D[d2] ... Rn [TIED_TO Rn] align [Rm] TIED_TO ... imm(idx)
2231 // Rn [TIED_TO Rn] align [Rm] D[d] D[d2] ...
2233 // Rn [TIED_TO Rn] align [Rm] D[d] D[d2] ... [imm(idx)]
2235 // Correctly set VLD*/VST*'s TIED_TO GPR, as the asm printer needs it.
2236 static bool DisassembleNLdSt0(MCInst &MI, unsigned Opcode, uint32_t insn,
2237 unsigned short NumOps, unsigned &NumOpsAdded, bool Store, bool DblSpaced,
2238 unsigned alignment, BO B) {
2240 const TargetInstrDesc &TID = ARMInsts[Opcode];
2241 const TargetOperandInfo *OpInfo = TID.OpInfo;
2243 // At least one DPR register plus addressing mode #6.
2244 assert(NumOps >= 3 && "Expect >= 3 operands");
2246 unsigned &OpIdx = NumOpsAdded;
2250 // We have homogeneous NEON registers for Load/Store.
2251 unsigned RegClass = 0;
2253 // Double-spaced registers have increments of 2.
2254 unsigned Inc = DblSpaced ? 2 : 1;
2256 unsigned Rn = decodeRn(insn);
2257 unsigned Rm = decodeRm(insn);
2258 unsigned Rd = decodeNEONRd(insn);
2260 // A7.7.1 Advanced SIMD addressing mode.
2263 // LLVM Addressing Mode #6.
2264 unsigned RmEnum = 0;
2266 RmEnum = getRegisterEnum(B, ARM::GPRRegClassID, Rm);
2269 // Consume possible WB, AddrMode6, possible increment reg, the DPR/QPR's,
2270 // then possible lane index.
2271 assert(OpIdx < NumOps && OpInfo[0].RegClass == ARM::GPRRegClassID &&
2272 "Reg operand expected");
2275 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2280 assert((OpIdx+1) < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
2281 OpInfo[OpIdx + 1].RegClass < 0 && "Addrmode #6 Operands expected");
2282 // addrmode6 := (ops GPR:$addr, i32imm)
2283 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2285 MI.addOperand(MCOperand::CreateImm(alignment)); // Alignment
2289 MI.addOperand(MCOperand::CreateReg(RmEnum));
2293 assert(OpIdx < NumOps &&
2294 (OpInfo[OpIdx].RegClass == ARM::DPRRegClassID ||
2295 OpInfo[OpIdx].RegClass == ARM::QPRRegClassID) &&
2296 "Reg operand expected");
2298 RegClass = OpInfo[OpIdx].RegClass;
2299 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2300 MI.addOperand(MCOperand::CreateReg(
2301 getRegisterEnum(B, RegClass, Rd)));
2306 // Handle possible lane index.
2307 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2308 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2309 MI.addOperand(MCOperand::CreateImm(decodeLaneIndex(insn)));
2314 // Consume the DPR/QPR's, possible WB, AddrMode6, possible incrment reg,
2315 // possible TIED_TO DPR/QPR's (ignored), then possible lane index.
2316 RegClass = OpInfo[0].RegClass;
2318 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2319 MI.addOperand(MCOperand::CreateReg(
2320 getRegisterEnum(B, RegClass, Rd)));
2326 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2331 assert((OpIdx+1) < NumOps && OpInfo[OpIdx].RegClass == ARM::GPRRegClassID &&
2332 OpInfo[OpIdx + 1].RegClass < 0 && "Addrmode #6 Operands expected");
2333 // addrmode6 := (ops GPR:$addr, i32imm)
2334 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2336 MI.addOperand(MCOperand::CreateImm(alignment)); // Alignment
2340 MI.addOperand(MCOperand::CreateReg(RmEnum));
2344 while (OpIdx < NumOps && (unsigned)OpInfo[OpIdx].RegClass == RegClass) {
2345 assert(TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1 &&
2346 "Tied to operand expected");
2347 MI.addOperand(MCOperand::CreateReg(0));
2351 // Handle possible lane index.
2352 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2353 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2354 MI.addOperand(MCOperand::CreateImm(decodeLaneIndex(insn)));
2359 // Accessing registers past the end of the NEON register file is not
2367 // A8.6.308, A8.6.311, A8.6.314, A8.6.317.
2368 static bool Align4OneLaneInst(unsigned elem, unsigned size,
2369 unsigned index_align, unsigned & alignment) {
2377 return slice(index_align, 0, 0) == 0;
2378 else if (size == 1) {
2379 bits = slice(index_align, 1, 0);
2380 if (bits != 0 && bits != 1)
2385 } else if (size == 2) {
2386 bits = slice(index_align, 2, 0);
2387 if (bits != 0 && bits != 3)
2397 if (slice(index_align, 0, 0) == 1)
2401 if (slice(index_align, 0, 0) == 1)
2404 } else if (size == 2) {
2405 if (slice(index_align, 1, 1) != 0)
2407 if (slice(index_align, 0, 0) == 1)
2415 if (slice(index_align, 0, 0) != 0)
2419 if (slice(index_align, 0, 0) != 0)
2423 } else if (size == 2) {
2424 if (slice(index_align, 1, 0) != 0)
2432 if (slice(index_align, 0, 0) == 1)
2436 if (slice(index_align, 0, 0) == 1)
2439 } else if (size == 2) {
2440 bits = slice(index_align, 1, 0);
2454 // If L (Inst{21}) == 0, store instructions.
2455 // Find out about double-spaced-ness of the Opcode and pass it on to
2456 // DisassembleNLdSt0().
2457 static bool DisassembleNLdSt(MCInst &MI, unsigned Opcode, uint32_t insn,
2458 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2460 const StringRef Name = ARMInsts[Opcode].Name;
2461 bool DblSpaced = false;
2462 // 0 represents standard alignment, i.e., unaligned data access.
2463 unsigned alignment = 0;
2465 if (Name.find("LN") != std::string::npos) {
2466 // To one lane instructions.
2467 // See, for example, 8.6.317 VLD4 (single 4-element structure to one lane).
2469 unsigned elem = 0; // legal values: {1, 2, 3, 4}
2470 if (Name.startswith("VST1") || Name.startswith("VLD1"))
2473 if (Name.startswith("VST2") || Name.startswith("VLD2"))
2476 if (Name.startswith("VST3") || Name.startswith("VLD3"))
2479 if (Name.startswith("VST4") || Name.startswith("VLD4"))
2482 // Utility function takes number of elements, size, and index_align.
2483 if (!Align4OneLaneInst(elem,
2484 slice(insn, 11, 10),
2489 // <size> == 16 && Inst{5} == 1 --> DblSpaced = true
2490 if (Name.endswith("16") || Name.endswith("16_UPD"))
2491 DblSpaced = slice(insn, 5, 5) == 1;
2493 // <size> == 32 && Inst{6} == 1 --> DblSpaced = true
2494 if (Name.endswith("32") || Name.endswith("32_UPD"))
2495 DblSpaced = slice(insn, 6, 6) == 1;
2497 // Multiple n-element structures with type encoded as Inst{11-8}.
2498 // See, for example, A8.6.316 VLD4 (multiple 4-element structures).
2500 // Inst{5-4} encodes alignment.
2501 switch (slice(insn, 5, 4)) {
2505 alignment = 64; break;
2507 alignment = 128; break;
2509 alignment = 256; break;
2512 // n == 2 && type == 0b1001 -> DblSpaced = true
2513 if (Name.startswith("VST2") || Name.startswith("VLD2"))
2514 DblSpaced = slice(insn, 11, 8) == 9;
2516 // n == 3 && type == 0b0101 -> DblSpaced = true
2517 if (Name.startswith("VST3") || Name.startswith("VLD3")) {
2518 // A8.6.313 & A8.6.395
2519 if (slice(insn, 7, 6) == 3 && slice(insn, 5, 5) == 1)
2522 DblSpaced = slice(insn, 11, 8) == 5;
2525 // n == 4 && type == 0b0001 -> DblSpaced = true
2526 if (Name.startswith("VST4") || Name.startswith("VLD4"))
2527 DblSpaced = slice(insn, 11, 8) == 1;
2529 return DisassembleNLdSt0(MI, Opcode, insn, NumOps, NumOpsAdded,
2530 slice(insn, 21, 21) == 0, DblSpaced, alignment/8, B);
2537 // Qd/Dd imm src(=Qd/Dd)
2538 static bool DisassembleN1RegModImmFrm(MCInst &MI, unsigned Opcode,
2539 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2541 const TargetInstrDesc &TID = ARMInsts[Opcode];
2542 const TargetOperandInfo *OpInfo = TID.OpInfo;
2544 assert(NumOps >= 2 &&
2545 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2546 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2547 (OpInfo[1].RegClass < 0) &&
2548 "Expect 1 reg operand followed by 1 imm operand");
2550 // Qd/Dd = Inst{22:15-12} => NEON Rd
2551 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[0].RegClass,
2552 decodeNEONRd(insn))));
2554 ElemSize esize = ESizeNA;
2557 case ARM::VMOVv16i8:
2560 case ARM::VMOVv4i16:
2561 case ARM::VMOVv8i16:
2562 case ARM::VMVNv4i16:
2563 case ARM::VMVNv8i16:
2564 case ARM::VBICiv4i16:
2565 case ARM::VBICiv8i16:
2566 case ARM::VORRiv4i16:
2567 case ARM::VORRiv8i16:
2570 case ARM::VMOVv2i32:
2571 case ARM::VMOVv4i32:
2572 case ARM::VMVNv2i32:
2573 case ARM::VMVNv4i32:
2574 case ARM::VBICiv2i32:
2575 case ARM::VBICiv4i32:
2576 case ARM::VORRiv2i32:
2577 case ARM::VORRiv4i32:
2580 case ARM::VMOVv1i64:
2581 case ARM::VMOVv2i64:
2585 assert(0 && "Unexpected opcode!");
2589 // One register and a modified immediate value.
2590 // Add the imm operand.
2591 MI.addOperand(MCOperand::CreateImm(decodeN1VImm(insn, esize)));
2595 // VBIC/VORRiv*i* variants have an extra $src = $Vd to be filled in.
2597 (OpInfo[2].RegClass == ARM::DPRRegClassID ||
2598 OpInfo[2].RegClass == ARM::QPRRegClassID)) {
2599 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[0].RegClass,
2600 decodeNEONRd(insn))));
2611 N2V_VectorConvert_Between_Float_Fixed
2613 } // End of unnamed namespace
2615 // Vector Convert [between floating-point and fixed-point]
2616 // Qd/Dd Qm/Dm [fbits]
2618 // Vector Duplicate Lane (from scalar to all elements) Instructions.
2619 // VDUPLN16d, VDUPLN16q, VDUPLN32d, VDUPLN32q, VDUPLN8d, VDUPLN8q:
2622 // Vector Move Long:
2625 // Vector Move Narrow:
2629 static bool DisassembleNVdVmOptImm(MCInst &MI, unsigned Opc, uint32_t insn,
2630 unsigned short NumOps, unsigned &NumOpsAdded, N2VFlag Flag, BO B) {
2632 const TargetInstrDesc &TID = ARMInsts[Opc];
2633 const TargetOperandInfo *OpInfo = TID.OpInfo;
2635 assert(NumOps >= 2 &&
2636 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2637 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2638 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2639 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2640 "Expect >= 2 operands and first 2 as reg operands");
2642 unsigned &OpIdx = NumOpsAdded;
2646 ElemSize esize = ESizeNA;
2647 if (Flag == N2V_VectorDupLane) {
2648 // VDUPLN has its index embedded. Its size can be inferred from the Opcode.
2649 assert(Opc >= ARM::VDUPLN16d && Opc <= ARM::VDUPLN8q &&
2650 "Unexpected Opcode");
2651 esize = (Opc == ARM::VDUPLN8d || Opc == ARM::VDUPLN8q) ? ESize8
2652 : ((Opc == ARM::VDUPLN16d || Opc == ARM::VDUPLN16q) ? ESize16
2656 // Qd/Dd = Inst{22:15-12} => NEON Rd
2657 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2658 decodeNEONRd(insn))));
2662 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2664 MI.addOperand(MCOperand::CreateReg(0));
2668 // Dm = Inst{5:3-0} => NEON Rm
2669 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2670 decodeNEONRm(insn))));
2673 // VZIP and others have two TIED_TO reg operands.
2675 while (OpIdx < NumOps &&
2676 (Idx = TID.getOperandConstraint(OpIdx, TOI::TIED_TO)) != -1) {
2677 // Add TIED_TO operand.
2678 MI.addOperand(MI.getOperand(Idx));
2682 // Add the imm operand, if required.
2683 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2684 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2686 unsigned imm = 0xFFFFFFFF;
2688 if (Flag == N2V_VectorDupLane)
2689 imm = decodeNVLaneDupIndex(insn, esize);
2690 if (Flag == N2V_VectorConvert_Between_Float_Fixed)
2691 imm = decodeVCVTFractionBits(insn);
2693 assert(imm != 0xFFFFFFFF && "Internal error");
2694 MI.addOperand(MCOperand::CreateImm(imm));
2701 static bool DisassembleN2RegFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2702 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2704 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2707 static bool DisassembleNVCVTFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2708 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2710 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2711 N2V_VectorConvert_Between_Float_Fixed, B);
2713 static bool DisassembleNVecDupLnFrm(MCInst &MI, unsigned Opc, uint32_t insn,
2714 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2716 return DisassembleNVdVmOptImm(MI, Opc, insn, NumOps, NumOpsAdded,
2717 N2V_VectorDupLane, B);
2720 // Vector Shift [Accumulate] Instructions.
2721 // Qd/Dd [Qd/Dd (TIED_TO)] Qm/Dm ShiftAmt
2723 // Vector Shift Left Long (with maximum shift count) Instructions.
2724 // VSHLLi16, VSHLLi32, VSHLLi8: Qd Dm imm (== size)
2726 static bool DisassembleNVectorShift(MCInst &MI, unsigned Opcode, uint32_t insn,
2727 unsigned short NumOps, unsigned &NumOpsAdded, bool LeftShift, BO B) {
2729 const TargetInstrDesc &TID = ARMInsts[Opcode];
2730 const TargetOperandInfo *OpInfo = TID.OpInfo;
2732 assert(NumOps >= 3 &&
2733 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2734 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2735 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2736 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2737 "Expect >= 3 operands and first 2 as reg operands");
2739 unsigned &OpIdx = NumOpsAdded;
2743 // Qd/Dd = Inst{22:15-12} => NEON Rd
2744 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2745 decodeNEONRd(insn))));
2748 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2750 MI.addOperand(MCOperand::CreateReg(0));
2754 assert((OpInfo[OpIdx].RegClass == ARM::DPRRegClassID ||
2755 OpInfo[OpIdx].RegClass == ARM::QPRRegClassID) &&
2756 "Reg operand expected");
2758 // Qm/Dm = Inst{5:3-0} => NEON Rm
2759 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2760 decodeNEONRm(insn))));
2763 assert(OpInfo[OpIdx].RegClass < 0 && "Imm operand expected");
2765 // Add the imm operand.
2767 // VSHLL has maximum shift count as the imm, inferred from its size.
2771 Imm = decodeNVSAmt(insn, LeftShift);
2783 MI.addOperand(MCOperand::CreateImm(Imm));
2789 // Left shift instructions.
2790 static bool DisassembleN2RegVecShLFrm(MCInst &MI, unsigned Opcode,
2791 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2793 return DisassembleNVectorShift(MI, Opcode, insn, NumOps, NumOpsAdded, true,
2796 // Right shift instructions have different shift amount interpretation.
2797 static bool DisassembleN2RegVecShRFrm(MCInst &MI, unsigned Opcode,
2798 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2800 return DisassembleNVectorShift(MI, Opcode, insn, NumOps, NumOpsAdded, false,
2809 N3V_Multiply_By_Scalar
2811 } // End of unnamed namespace
2813 // NEON Three Register Instructions with Optional Immediate Operand
2815 // Vector Extract Instructions.
2816 // Qd/Dd Qn/Dn Qm/Dm imm4
2818 // Vector Shift (Register) Instructions.
2819 // Qd/Dd Qm/Dm Qn/Dn (notice the order of m, n)
2821 // Vector Multiply [Accumulate/Subtract] [Long] By Scalar Instructions.
2822 // Qd/Dd Qn/Dn RestrictedDm index
2825 static bool DisassembleNVdVnVmOptImm(MCInst &MI, unsigned Opcode, uint32_t insn,
2826 unsigned short NumOps, unsigned &NumOpsAdded, N3VFlag Flag, BO B) {
2828 const TargetInstrDesc &TID = ARMInsts[Opcode];
2829 const TargetOperandInfo *OpInfo = TID.OpInfo;
2831 // No checking for OpInfo[2] because of MOVDneon/MOVQ with only two regs.
2832 assert(NumOps >= 3 &&
2833 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
2834 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
2835 (OpInfo[1].RegClass == ARM::DPRRegClassID ||
2836 OpInfo[1].RegClass == ARM::QPRRegClassID) &&
2837 "Expect >= 3 operands and first 2 as reg operands");
2839 unsigned &OpIdx = NumOpsAdded;
2843 bool VdVnVm = Flag == N3V_VectorShift ? false : true;
2844 bool IsImm4 = Flag == N3V_VectorExtract ? true : false;
2845 bool IsDmRestricted = Flag == N3V_Multiply_By_Scalar ? true : false;
2846 ElemSize esize = ESizeNA;
2847 if (Flag == N3V_Multiply_By_Scalar) {
2848 unsigned size = (insn >> 20) & 3;
2849 if (size == 1) esize = ESize16;
2850 if (size == 2) esize = ESize32;
2851 assert (esize == ESize16 || esize == ESize32);
2854 // Qd/Dd = Inst{22:15-12} => NEON Rd
2855 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2856 decodeNEONRd(insn))));
2859 // VABA, VABAL, VBSLd, VBSLq, ...
2860 if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1) {
2862 MI.addOperand(MCOperand::CreateReg(0));
2866 // Dn = Inst{7:19-16} => NEON Rn
2868 // Dm = Inst{5:3-0} => NEON Rm
2869 MI.addOperand(MCOperand::CreateReg(
2870 getRegisterEnum(B, OpInfo[OpIdx].RegClass,
2871 VdVnVm ? decodeNEONRn(insn)
2872 : decodeNEONRm(insn))));
2875 // Special case handling for VMOVDneon and VMOVQ because they are marked as
2877 if (Opcode == ARM::VMOVDneon || Opcode == ARM::VMOVQ)
2880 // Dm = Inst{5:3-0} => NEON Rm
2882 // Dm is restricted to D0-D7 if size is 16, D0-D15 otherwise
2884 // Dn = Inst{7:19-16} => NEON Rn
2885 unsigned m = VdVnVm ? (IsDmRestricted ? decodeRestrictedDm(insn, esize)
2886 : decodeNEONRm(insn))
2887 : decodeNEONRn(insn);
2889 MI.addOperand(MCOperand::CreateReg(
2890 getRegisterEnum(B, OpInfo[OpIdx].RegClass, m)));
2893 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass < 0
2894 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
2895 // Add the imm operand.
2898 Imm = decodeN3VImm(insn);
2899 else if (IsDmRestricted)
2900 Imm = decodeRestrictedDmIndex(insn, esize);
2902 assert(0 && "Internal error: unreachable code!");
2906 MI.addOperand(MCOperand::CreateImm(Imm));
2913 static bool DisassembleN3RegFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2914 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2916 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2919 static bool DisassembleN3RegVecShFrm(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_VectorShift, B);
2925 static bool DisassembleNVecExtractFrm(MCInst &MI, unsigned Opcode,
2926 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2928 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2929 N3V_VectorExtract, B);
2931 static bool DisassembleNVecMulScalarFrm(MCInst &MI, unsigned Opcode,
2932 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2934 return DisassembleNVdVnVmOptImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2935 N3V_Multiply_By_Scalar, B);
2938 // Vector Table Lookup
2940 // VTBL1, VTBX1: Dd [Dd(TIED_TO)] Dn Dm
2941 // VTBL2, VTBX2: Dd [Dd(TIED_TO)] Dn Dn+1 Dm
2942 // VTBL3, VTBX3: Dd [Dd(TIED_TO)] Dn Dn+1 Dn+2 Dm
2943 // VTBL4, VTBX4: Dd [Dd(TIED_TO)] Dn Dn+1 Dn+2 Dn+3 Dm
2944 static bool DisassembleNVTBLFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2945 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2947 const TargetInstrDesc &TID = ARMInsts[Opcode];
2948 const TargetOperandInfo *OpInfo = TID.OpInfo;
2949 if (!OpInfo) return false;
2951 assert(NumOps >= 3 &&
2952 OpInfo[0].RegClass == ARM::DPRRegClassID &&
2953 OpInfo[1].RegClass == ARM::DPRRegClassID &&
2954 OpInfo[2].RegClass == ARM::DPRRegClassID &&
2955 "Expect >= 3 operands and first 3 as reg operands");
2957 unsigned &OpIdx = NumOpsAdded;
2961 unsigned Rn = decodeNEONRn(insn);
2963 // {Dn} encoded as len = 0b00
2964 // {Dn Dn+1} encoded as len = 0b01
2965 // {Dn Dn+1 Dn+2 } encoded as len = 0b10
2966 // {Dn Dn+1 Dn+2 Dn+3} encoded as len = 0b11
2967 unsigned Len = slice(insn, 9, 8) + 1;
2969 // Dd (the destination vector)
2970 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2971 decodeNEONRd(insn))));
2974 // Process tied_to operand constraint.
2976 if ((Idx = TID.getOperandConstraint(OpIdx, TOI::TIED_TO)) != -1) {
2977 MI.addOperand(MI.getOperand(Idx));
2981 // Do the <list> now.
2982 for (unsigned i = 0; i < Len; ++i) {
2983 assert(OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::DPRRegClassID &&
2984 "Reg operand expected");
2985 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2990 // Dm (the index vector)
2991 assert(OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::DPRRegClassID &&
2992 "Reg operand (index vector) expected");
2993 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
2994 decodeNEONRm(insn))));
3000 // Vector Get Lane (move scalar to ARM core register) Instructions.
3001 // VGETLNi32, VGETLNs16, VGETLNs8, VGETLNu16, VGETLNu8: Rt Dn index
3002 static bool DisassembleNGetLnFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3003 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3005 const TargetInstrDesc &TID = ARMInsts[Opcode];
3006 const TargetOperandInfo *OpInfo = TID.OpInfo;
3007 if (!OpInfo) return false;
3009 assert(TID.getNumDefs() == 1 && NumOps >= 3 &&
3010 OpInfo[0].RegClass == ARM::GPRRegClassID &&
3011 OpInfo[1].RegClass == ARM::DPRRegClassID &&
3012 OpInfo[2].RegClass < 0 &&
3013 "Expect >= 3 operands with one dst operand");
3016 Opcode == ARM::VGETLNi32 ? ESize32
3017 : ((Opcode == ARM::VGETLNs16 || Opcode == ARM::VGETLNu16) ? ESize16
3020 // Rt = Inst{15-12} => ARM Rd
3021 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3024 // Dn = Inst{7:19-16} => NEON Rn
3025 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
3026 decodeNEONRn(insn))));
3028 MI.addOperand(MCOperand::CreateImm(decodeNVLaneOpIndex(insn, esize)));
3034 // Vector Set Lane (move ARM core register to scalar) Instructions.
3035 // VSETLNi16, VSETLNi32, VSETLNi8: Dd Dd (TIED_TO) Rt index
3036 static bool DisassembleNSetLnFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3037 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3039 const TargetInstrDesc &TID = ARMInsts[Opcode];
3040 const TargetOperandInfo *OpInfo = TID.OpInfo;
3041 if (!OpInfo) return false;
3043 assert(TID.getNumDefs() == 1 && NumOps >= 3 &&
3044 OpInfo[0].RegClass == ARM::DPRRegClassID &&
3045 OpInfo[1].RegClass == ARM::DPRRegClassID &&
3046 TID.getOperandConstraint(1, TOI::TIED_TO) != -1 &&
3047 OpInfo[2].RegClass == ARM::GPRRegClassID &&
3048 OpInfo[3].RegClass < 0 &&
3049 "Expect >= 3 operands with one dst operand");
3052 Opcode == ARM::VSETLNi8 ? ESize8
3053 : (Opcode == ARM::VSETLNi16 ? ESize16
3056 // Dd = Inst{7:19-16} => NEON Rn
3057 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::DPRRegClassID,
3058 decodeNEONRn(insn))));
3061 MI.addOperand(MCOperand::CreateReg(0));
3063 // Rt = Inst{15-12} => ARM Rd
3064 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3067 MI.addOperand(MCOperand::CreateImm(decodeNVLaneOpIndex(insn, esize)));
3073 // Vector Duplicate Instructions (from ARM core register to all elements).
3074 // VDUP8d, VDUP16d, VDUP32d, VDUP8q, VDUP16q, VDUP32q: Qd/Dd Rt
3075 static bool DisassembleNDupFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3076 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3078 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3080 assert(NumOps >= 2 &&
3081 (OpInfo[0].RegClass == ARM::DPRRegClassID ||
3082 OpInfo[0].RegClass == ARM::QPRRegClassID) &&
3083 OpInfo[1].RegClass == ARM::GPRRegClassID &&
3084 "Expect >= 2 operands and first 2 as reg operand");
3086 unsigned RegClass = OpInfo[0].RegClass;
3088 // Qd/Dd = Inst{7:19-16} => NEON Rn
3089 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, RegClass,
3090 decodeNEONRn(insn))));
3092 // Rt = Inst{15-12} => ARM Rd
3093 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3103 static inline bool MemBarrierInstr(uint32_t insn) {
3104 unsigned op7_4 = slice(insn, 7, 4);
3105 if (slice(insn, 31, 8) == 0xf57ff0 && (op7_4 >= 4 && op7_4 <= 6))
3111 static inline bool PreLoadOpcode(unsigned Opcode) {
3113 case ARM::PLDi12: case ARM::PLDrs:
3114 case ARM::PLDWi12: case ARM::PLDWrs:
3115 case ARM::PLIi12: case ARM::PLIrs:
3122 static bool DisassemblePreLoadFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3123 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3125 // Preload Data/Instruction requires either 2 or 3 operands.
3126 // PLDi12, PLDWi12, PLIi12: addrmode_imm12
3127 // PLDrs, PLDWrs, PLIrs: ldst_so_reg
3129 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3132 if (Opcode == ARM::PLDi12 || Opcode == ARM::PLDWi12
3133 || Opcode == ARM::PLIi12) {
3134 unsigned Imm12 = slice(insn, 11, 0);
3135 bool Negative = getUBit(insn) == 0;
3137 // A8.6.118 PLD (literal) PLDWi12 with Rn=PC is transformed to PLDi12.
3138 if (Opcode == ARM::PLDWi12 && slice(insn, 19, 16) == 0xF) {
3139 DEBUG(errs() << "Rn == '1111': PLDWi12 morphed to PLDi12\n");
3140 MI.setOpcode(ARM::PLDi12);
3143 // -0 is represented specially. All other values are as normal.
3144 int Offset = Negative ? -1 * Imm12 : Imm12;
3145 if (Imm12 == 0 && Negative)
3148 MI.addOperand(MCOperand::CreateImm(Offset));
3151 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
3154 ARM_AM::AddrOpc AddrOpcode = getUBit(insn) ? ARM_AM::add : ARM_AM::sub;
3156 // Inst{6-5} encodes the shift opcode.
3157 ARM_AM::ShiftOpc ShOp = getShiftOpcForBits(slice(insn, 6, 5));
3158 // Inst{11-7} encodes the imm5 shift amount.
3159 unsigned ShImm = slice(insn, 11, 7);
3161 // A8.4.1. Possible rrx or shift amount of 32...
3162 getImmShiftSE(ShOp, ShImm);
3163 MI.addOperand(MCOperand::CreateImm(
3164 ARM_AM::getAM2Opc(AddrOpcode, ShImm, ShOp)));
3171 static bool DisassembleMiscFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
3172 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
3174 if (MemBarrierInstr(insn)) {
3175 // DMBsy, DSBsy, and ISBsy instructions have zero operand and are taken care
3176 // of within the generic ARMBasicMCBuilder::BuildIt() method.
3178 // Inst{3-0} encodes the memory barrier option for the variants.
3179 MI.addOperand(MCOperand::CreateImm(slice(insn, 3, 0)));
3195 // SWP, SWPB: Rd Rm Rn
3196 // Delegate to DisassembleLdStExFrm()....
3197 return DisassembleLdStExFrm(MI, Opcode, insn, NumOps, NumOpsAdded, B);
3202 if (Opcode == ARM::SETEND) {
3204 MI.addOperand(MCOperand::CreateImm(slice(insn, 9, 9)));
3208 // FIXME: To enable correct asm parsing and disasm of CPS we need 3 different
3209 // opcodes which match the same real instruction. This is needed since there's
3210 // no current handling of optional arguments. Fix here when a better handling
3211 // of optional arguments is implemented.
3212 if (Opcode == ARM::CPS3p) { // M = 1
3213 // Let's reject these impossible imod values by returning false:
3216 // AsmPrinter cannot handle imod=0b00, plus (imod=0b00,M=1,iflags!=0) is an
3217 // invalid combination, so we just check for imod=0b00 here.
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
3222 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0))); // mode
3226 if (Opcode == ARM::CPS2p) { // mode = 0, M = 0
3227 // Let's reject these impossible imod values by returning false:
3228 // 1. (imod=0b00,M=0)
3230 if (slice(insn, 19, 18) == 0 || slice(insn, 19, 18) == 1)
3232 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 18))); // imod
3233 MI.addOperand(MCOperand::CreateImm(slice(insn, 8, 6))); // iflags
3237 if (Opcode == ARM::CPS1p) { // imod = 0, iflags = 0, M = 1
3238 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0))); // mode
3243 // DBG has its option specified in Inst{3-0}.
3244 if (Opcode == ARM::DBG) {
3245 MI.addOperand(MCOperand::CreateImm(slice(insn, 3, 0)));
3250 // BKPT takes an imm32 val equal to ZeroExtend(Inst{19-8:3-0}).
3251 if (Opcode == ARM::BKPT) {
3252 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 8) << 4 |
3253 slice(insn, 3, 0)));
3258 if (PreLoadOpcode(Opcode))
3259 return DisassemblePreLoadFrm(MI, Opcode, insn, NumOps, NumOpsAdded, B);
3261 assert(0 && "Unexpected misc instruction!");
3265 /// FuncPtrs - FuncPtrs maps ARMFormat to its corresponding DisassembleFP.
3266 /// We divide the disassembly task into different categories, with each one
3267 /// corresponding to a specific instruction encoding format. There could be
3268 /// exceptions when handling a specific format, and that is why the Opcode is
3269 /// also present in the function prototype.
3270 static const DisassembleFP FuncPtrs[] = {
3274 &DisassembleBrMiscFrm,
3276 &DisassembleDPSoRegFrm,
3279 &DisassembleLdMiscFrm,
3280 &DisassembleStMiscFrm,
3281 &DisassembleLdStMulFrm,
3282 &DisassembleLdStExFrm,
3283 &DisassembleArithMiscFrm,
3286 &DisassembleVFPUnaryFrm,
3287 &DisassembleVFPBinaryFrm,
3288 &DisassembleVFPConv1Frm,
3289 &DisassembleVFPConv2Frm,
3290 &DisassembleVFPConv3Frm,
3291 &DisassembleVFPConv4Frm,
3292 &DisassembleVFPConv5Frm,
3293 &DisassembleVFPLdStFrm,
3294 &DisassembleVFPLdStMulFrm,
3295 &DisassembleVFPMiscFrm,
3296 &DisassembleThumbFrm,
3297 &DisassembleMiscFrm,
3298 &DisassembleNGetLnFrm,
3299 &DisassembleNSetLnFrm,
3300 &DisassembleNDupFrm,
3302 // VLD and VST (including one lane) Instructions.
3305 // A7.4.6 One register and a modified immediate value
3306 // 1-Register Instructions with imm.
3307 // LLVM only defines VMOVv instructions.
3308 &DisassembleN1RegModImmFrm,
3310 // 2-Register Instructions with no imm.
3311 &DisassembleN2RegFrm,
3313 // 2-Register Instructions with imm (vector convert float/fixed point).
3314 &DisassembleNVCVTFrm,
3316 // 2-Register Instructions with imm (vector dup lane).
3317 &DisassembleNVecDupLnFrm,
3319 // Vector Shift Left Instructions.
3320 &DisassembleN2RegVecShLFrm,
3322 // Vector Shift Righ Instructions, which has different interpretation of the
3323 // shift amount from the imm6 field.
3324 &DisassembleN2RegVecShRFrm,
3326 // 3-Register Data-Processing Instructions.
3327 &DisassembleN3RegFrm,
3329 // Vector Shift (Register) Instructions.
3330 // D:Vd M:Vm N:Vn (notice that M:Vm is the first operand)
3331 &DisassembleN3RegVecShFrm,
3333 // Vector Extract Instructions.
3334 &DisassembleNVecExtractFrm,
3336 // Vector [Saturating Rounding Doubling] Multiply [Accumulate/Subtract] [Long]
3337 // By Scalar Instructions.
3338 &DisassembleNVecMulScalarFrm,
3340 // Vector Table Lookup uses byte indexes in a control vector to look up byte
3341 // values in a table and generate a new vector.
3342 &DisassembleNVTBLFrm,
3347 /// BuildIt - BuildIt performs the build step for this ARM Basic MC Builder.
3348 /// The general idea is to set the Opcode for the MCInst, followed by adding
3349 /// the appropriate MCOperands to the MCInst. ARM Basic MC Builder delegates
3350 /// to the Format-specific disassemble function for disassembly, followed by
3351 /// TryPredicateAndSBitModifier() to do PredicateOperand and OptionalDefOperand
3352 /// which follow the Dst/Src Operands.
3353 bool ARMBasicMCBuilder::BuildIt(MCInst &MI, uint32_t insn) {
3354 // Stage 1 sets the Opcode.
3355 MI.setOpcode(Opcode);
3356 // If the number of operands is zero, we're done!
3360 // Stage 2 calls the format-specific disassemble function to build the operand
3364 unsigned NumOpsAdded = 0;
3365 bool OK = (*Disasm)(MI, Opcode, insn, NumOps, NumOpsAdded, this);
3367 if (!OK || this->Err != 0) return false;
3368 if (NumOpsAdded >= NumOps)
3371 // Stage 3 deals with operands unaccounted for after stage 2 is finished.
3372 // FIXME: Should this be done selectively?
3373 return TryPredicateAndSBitModifier(MI, Opcode, insn, NumOps - NumOpsAdded);
3376 // A8.3 Conditional execution
3377 // A8.3.1 Pseudocode details of conditional execution
3378 // Condition bits '111x' indicate the instruction is always executed.
3379 static uint32_t CondCode(uint32_t CondField) {
3380 if (CondField == 0xF)
3385 /// DoPredicateOperands - DoPredicateOperands process the predicate operands
3386 /// of some Thumb instructions which come before the reglist operands. It
3387 /// returns true if the two predicate operands have been processed.
3388 bool ARMBasicMCBuilder::DoPredicateOperands(MCInst& MI, unsigned Opcode,
3389 uint32_t /* insn */, unsigned short NumOpsRemaining) {
3391 assert(NumOpsRemaining > 0 && "Invalid argument");
3393 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3394 unsigned Idx = MI.getNumOperands();
3396 // First, we check whether this instr specifies the PredicateOperand through
3397 // a pair of TargetOperandInfos with isPredicate() property.
3398 if (NumOpsRemaining >= 2 &&
3399 OpInfo[Idx].isPredicate() && OpInfo[Idx+1].isPredicate() &&
3400 OpInfo[Idx].RegClass < 0 &&
3401 OpInfo[Idx+1].RegClass == ARM::CCRRegClassID)
3403 // If we are inside an IT block, get the IT condition bits maintained via
3404 // ARMBasicMCBuilder::ITState[7:0], through ARMBasicMCBuilder::GetITCond().
3407 MI.addOperand(MCOperand::CreateImm(GetITCond()));
3409 MI.addOperand(MCOperand::CreateImm(ARMCC::AL));
3410 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
3417 /// TryPredicateAndSBitModifier - TryPredicateAndSBitModifier tries to process
3418 /// the possible Predicate and SBitModifier, to build the remaining MCOperand
3420 bool ARMBasicMCBuilder::TryPredicateAndSBitModifier(MCInst& MI, unsigned Opcode,
3421 uint32_t insn, unsigned short NumOpsRemaining) {
3423 assert(NumOpsRemaining > 0 && "Invalid argument");
3425 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
3426 const std::string &Name = ARMInsts[Opcode].Name;
3427 unsigned Idx = MI.getNumOperands();
3428 uint64_t TSFlags = ARMInsts[Opcode].TSFlags;
3430 // First, we check whether this instr specifies the PredicateOperand through
3431 // a pair of TargetOperandInfos with isPredicate() property.
3432 if (NumOpsRemaining >= 2 &&
3433 OpInfo[Idx].isPredicate() && OpInfo[Idx+1].isPredicate() &&
3434 OpInfo[Idx].RegClass < 0 &&
3435 OpInfo[Idx+1].RegClass == ARM::CCRRegClassID)
3437 // If we are inside an IT block, get the IT condition bits maintained via
3438 // ARMBasicMCBuilder::ITState[7:0], through ARMBasicMCBuilder::GetITCond().
3441 MI.addOperand(MCOperand::CreateImm(GetITCond()));
3443 if (Name.length() > 1 && Name[0] == 't') {
3444 // Thumb conditional branch instructions have their cond field embedded,
3448 if (Name == "t2Bcc")
3449 MI.addOperand(MCOperand::CreateImm(CondCode(slice(insn, 25, 22))));
3450 else if (Name == "tBcc")
3451 MI.addOperand(MCOperand::CreateImm(CondCode(slice(insn, 11, 8))));
3453 MI.addOperand(MCOperand::CreateImm(ARMCC::AL));
3455 // ARM instructions get their condition field from Inst{31-28}.
3456 // We should reject Inst{31-28} = 0b1111 as invalid encoding.
3457 if (!isNEONDomain(TSFlags) && getCondField(insn) == 0xF)
3459 MI.addOperand(MCOperand::CreateImm(CondCode(getCondField(insn))));
3462 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
3464 NumOpsRemaining -= 2;
3467 if (NumOpsRemaining == 0)
3470 // Next, if OptionalDefOperand exists, we check whether the 'S' bit is set.
3471 if (OpInfo[Idx].isOptionalDef() && OpInfo[Idx].RegClass==ARM::CCRRegClassID) {
3472 MI.addOperand(MCOperand::CreateReg(getSBit(insn) == 1 ? ARM::CPSR : 0));
3476 if (NumOpsRemaining == 0)
3482 /// RunBuildAfterHook - RunBuildAfterHook performs operations deemed necessary
3483 /// after BuildIt is finished.
3484 bool ARMBasicMCBuilder::RunBuildAfterHook(bool Status, MCInst &MI,
3487 if (!SP) return Status;
3489 if (Opcode == ARM::t2IT)
3490 Status = SP->InitIT(slice(insn, 7, 0)) ? Status : false;
3491 else if (InITBlock())
3497 /// Opcode, Format, and NumOperands make up an ARM Basic MCBuilder.
3498 ARMBasicMCBuilder::ARMBasicMCBuilder(unsigned opc, ARMFormat format,
3500 : Opcode(opc), Format(format), NumOps(num), SP(0), Err(0) {
3501 unsigned Idx = (unsigned)format;
3502 assert(Idx < (array_lengthof(FuncPtrs) - 1) && "Unknown format");
3503 Disasm = FuncPtrs[Idx];
3506 /// CreateMCBuilder - Return an ARMBasicMCBuilder that can build up the MC
3507 /// infrastructure of an MCInst given the Opcode and Format of the instr.
3508 /// Return NULL if it fails to create/return a proper builder. API clients
3509 /// are responsible for freeing up of the allocated memory. Cacheing can be
3510 /// performed by the API clients to improve performance.
3511 ARMBasicMCBuilder *llvm::CreateMCBuilder(unsigned Opcode, ARMFormat Format) {
3512 // For "Unknown format", fail by returning a NULL pointer.
3513 if ((unsigned)Format >= (array_lengthof(FuncPtrs) - 1)) {
3514 DEBUG(errs() << "Unknown format\n");
3518 return new ARMBasicMCBuilder(Opcode, Format,
3519 ARMInsts[Opcode].getNumOperands());