1 //===- ThumbDisassemblerCore.h - Thumb 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 for disassembling a Thumb instr. It is to be included by
12 // ARMDisassemblerCore.cpp because it contains the static DisassembleThumbFrm()
13 // function which acts as the dispatcher to disassemble a Thumb instruction.
15 //===----------------------------------------------------------------------===//
17 ///////////////////////////////
19 // Utility Functions //
21 ///////////////////////////////
23 // Utilities for 16-bit Thumb instructions.
25 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
27 [ tRm ] [ tRn ] [ tRd ]
40 // Extract tRt: Inst{10-8}.
41 static inline unsigned getT1tRt(uint32_t insn) {
42 return slice(insn, 10, 8);
45 // Extract tRm: Inst{8-6}.
46 static inline unsigned getT1tRm(uint32_t insn) {
47 return slice(insn, 8, 6);
50 // Extract tRn: Inst{5-3}.
51 static inline unsigned getT1tRn(uint32_t insn) {
52 return slice(insn, 5, 3);
55 // Extract tRd: Inst{2-0}.
56 static inline unsigned getT1tRd(uint32_t insn) {
57 return slice(insn, 2, 0);
60 // Extract [D:Rd]: Inst{7:2-0}.
61 static inline unsigned getT1Rd(uint32_t insn) {
62 return slice(insn, 7, 7) << 3 | slice(insn, 2, 0);
65 // Extract Rm: Inst{6-3}.
66 static inline unsigned getT1Rm(uint32_t insn) {
67 return slice(insn, 6, 3);
70 // Extract imm3: Inst{8-6}.
71 static inline unsigned getT1Imm3(uint32_t insn) {
72 return slice(insn, 8, 6);
75 // Extract imm5: Inst{10-6}.
76 static inline unsigned getT1Imm5(uint32_t insn) {
77 return slice(insn, 10, 6);
80 // Extract i:imm5: Inst{9:7-3}.
81 static inline unsigned getT1Imm6(uint32_t insn) {
82 return slice(insn, 9, 9) << 5 | slice(insn, 7, 3);
85 // Extract imm7: Inst{6-0}.
86 static inline unsigned getT1Imm7(uint32_t insn) {
87 return slice(insn, 6, 0);
90 // Extract imm8: Inst{7-0}.
91 static inline unsigned getT1Imm8(uint32_t insn) {
92 return slice(insn, 7, 0);
95 // Extract imm11: Inst{10-0}.
96 static inline unsigned getT1Imm11(uint32_t insn) {
97 return slice(insn, 10, 0);
100 // Extract cond: Inst{11-8}.
101 static inline unsigned getT1Cond(uint32_t insn) {
102 return slice(insn, 11, 8);
105 static inline bool IsGPR(unsigned RegClass) {
106 return RegClass == ARM::GPRRegClassID;
109 // Utilities for 32-bit Thumb instructions.
111 // Extract imm4: Inst{19-16}.
112 static inline unsigned getImm4(uint32_t insn) {
113 return slice(insn, 19, 16);
116 // Extract imm3: Inst{14-12}.
117 static inline unsigned getImm3(uint32_t insn) {
118 return slice(insn, 14, 12);
121 // Extract imm8: Inst{7-0}.
122 static inline unsigned getImm8(uint32_t insn) {
123 return slice(insn, 7, 0);
126 // A8.6.61 LDRB (immediate, Thumb) and friends
129 static inline int decodeImm8(uint32_t insn) {
130 int Offset = getImm8(insn);
131 return slice(insn, 9, 9) ? Offset : -Offset;
134 // Extract imm12: Inst{11-0}.
135 static inline unsigned getImm12(uint32_t insn) {
136 return slice(insn, 11, 0);
139 // A8.6.63 LDRB (literal) and friends
142 static inline int decodeImm12(uint32_t insn) {
143 int Offset = getImm12(insn);
144 return slice(insn, 23, 23) ? Offset : -Offset;
147 // Extract imm2: Inst{7-6}.
148 static inline unsigned getImm2(uint32_t insn) {
149 return slice(insn, 7, 6);
152 // For BFI, BFC, t2SBFX, and t2UBFX.
153 // Extract lsb: Inst{14-12:7-6}.
154 static inline unsigned getLsb(uint32_t insn) {
155 return getImm3(insn) << 2 | getImm2(insn);
159 // Extract msb: Inst{4-0}.
160 static inline unsigned getMsb(uint32_t insn) {
161 return slice(insn, 4, 0);
164 // For t2SBFX and t2UBFX.
165 // Extract widthminus1: Inst{4-0}.
166 static inline unsigned getWidthMinus1(uint32_t insn) {
167 return slice(insn, 4, 0);
170 // For t2ADDri12 and t2SUBri12.
171 // imm12 = i:imm3:imm8;
172 static inline unsigned getIImm3Imm8(uint32_t insn) {
173 return slice(insn, 26, 26) << 11 | getImm3(insn) << 8 | getImm8(insn);
176 // For t2MOVi16 and t2MOVTi16.
177 // imm16 = imm4:i:imm3:imm8;
178 static inline unsigned getImm16(uint32_t insn) {
179 return getImm4(insn) << 12 | slice(insn, 26, 26) << 11 |
180 getImm3(insn) << 8 | getImm8(insn);
183 // Inst{5-4} encodes the shift type.
184 static inline unsigned getShiftTypeBits(uint32_t insn) {
185 return slice(insn, 5, 4);
188 // Inst{14-12}:Inst{7-6} encodes the imm5 shift amount.
189 static inline unsigned getShiftAmtBits(uint32_t insn) {
190 return getImm3(insn) << 2 | getImm2(insn);
194 // Encoding T1 ARMv6T2, ARMv7
195 // LLVM-specific encoding for #<lsb> and #<width>
196 static inline bool getBitfieldInvMask(uint32_t insn, uint32_t &mask) {
197 uint32_t lsb = getImm3(insn) << 2 | getImm2(insn);
198 uint32_t msb = getMsb(insn);
201 DEBUG(errs() << "Encoding error: msb < lsb\n");
204 for (uint32_t i = lsb; i <= msb; ++i)
210 // A8.4 Shifts applied to a register
211 // A8.4.1 Constant shifts
212 // A8.4.3 Pseudocode details of instruction-specified shifts and rotates
214 // decodeImmShift() returns the shift amount and the the shift opcode.
215 // Note that, as of Jan-06-2010, LLVM does not support rrx shifted operands yet.
216 static inline unsigned decodeImmShift(unsigned bits2, unsigned imm5,
217 ARM_AM::ShiftOpc &ShOp) {
219 assert(imm5 < 32 && "Invalid imm5 argument");
221 default: assert(0 && "No such value");
227 return (imm5 == 0 ? 32 : imm5);
230 return (imm5 == 0 ? 32 : imm5);
232 ShOp = (imm5 == 0 ? ARM_AM::rrx : ARM_AM::ror);
233 return (imm5 == 0 ? 1 : imm5);
237 // A6.3.2 Modified immediate constants in Thumb instructions
239 // ThumbExpandImm() returns the modified immediate constant given an imm12 for
240 // Thumb data-processing instructions with modified immediate.
241 // See also A6.3.1 Data-processing (modified immediate).
242 static inline unsigned ThumbExpandImm(unsigned imm12) {
243 assert(imm12 <= 0xFFF && "Invalid imm12 argument");
245 // If the leading two bits is 0b00, the modified immediate constant is
246 // obtained by splatting the low 8 bits into the first byte, every other byte,
247 // or every byte of a 32-bit value.
249 // Otherwise, a rotate right of '1':imm12<6:0> by the amount imm12<11:7> is
252 if (slice(imm12, 11, 10) == 0) {
253 unsigned short control = slice(imm12, 9, 8);
254 unsigned imm8 = slice(imm12, 7, 0);
257 assert(0 && "No such value");
262 return imm8 << 16 | imm8;
264 return imm8 << 24 | imm8 << 8;
266 return imm8 << 24 | imm8 << 16 | imm8 << 8 | imm8;
269 // A rotate is required.
270 unsigned Val = 1 << 7 | slice(imm12, 6, 0);
271 unsigned Amt = slice(imm12, 11, 7);
272 return ARM_AM::rotr32(Val, Amt);
276 static inline int decodeImm32_B_EncodingT3(uint32_t insn) {
277 bool S = slice(insn, 26, 26);
278 bool J1 = slice(insn, 13, 13);
279 bool J2 = slice(insn, 11, 11);
280 unsigned Imm21 = slice(insn, 21, 16) << 12 | slice(insn, 10, 0) << 1;
281 if (S) Imm21 |= 1 << 20;
282 if (J2) Imm21 |= 1 << 19;
283 if (J1) Imm21 |= 1 << 18;
285 return SignExtend32<21>(Imm21);
288 static inline int decodeImm32_B_EncodingT4(uint32_t insn) {
289 unsigned S = slice(insn, 26, 26);
290 bool I1 = slice(insn, 13, 13) == S;
291 bool I2 = slice(insn, 11, 11) == S;
292 unsigned Imm25 = slice(insn, 25, 16) << 12 | slice(insn, 10, 0) << 1;
293 if (S) Imm25 |= 1 << 24;
294 if (I1) Imm25 |= 1 << 23;
295 if (I2) Imm25 |= 1 << 22;
297 return SignExtend32<25>(Imm25);
300 static inline int decodeImm32_BL(uint32_t insn) {
301 unsigned S = slice(insn, 26, 26);
302 bool I1 = slice(insn, 13, 13) == S;
303 bool I2 = slice(insn, 11, 11) == S;
304 unsigned Imm25 = slice(insn, 25, 16) << 12 | slice(insn, 10, 0) << 1;
305 if (S) Imm25 |= 1 << 24;
306 if (I1) Imm25 |= 1 << 23;
307 if (I2) Imm25 |= 1 << 22;
309 return SignExtend32<25>(Imm25);
312 static inline int decodeImm32_BLX(uint32_t insn) {
313 unsigned S = slice(insn, 26, 26);
314 bool I1 = slice(insn, 13, 13) == S;
315 bool I2 = slice(insn, 11, 11) == S;
316 unsigned Imm25 = slice(insn, 25, 16) << 12 | slice(insn, 10, 1) << 2;
317 if (S) Imm25 |= 1 << 24;
318 if (I1) Imm25 |= 1 << 23;
319 if (I2) Imm25 |= 1 << 22;
321 return SignExtend32<25>(Imm25);
324 // See, for example, A8.6.221 SXTAB16.
325 static inline unsigned decodeRotate(uint32_t insn) {
326 unsigned rotate = slice(insn, 5, 4);
330 ///////////////////////////////////////////////
332 // Thumb1 instruction disassembly functions. //
334 ///////////////////////////////////////////////
336 // See "Utilities for 16-bit Thumb instructions" for register naming convention.
338 // A6.2.1 Shift (immediate), add, subtract, move, and compare
340 // shift immediate: tRd CPSR tRn imm5
341 // add/sub register: tRd CPSR tRn tRm
342 // add/sub 3-bit immediate: tRd CPSR tRn imm3
343 // add/sub 8-bit immediate: tRt CPSR tRt(TIED_TO) imm8
344 // mov/cmp immediate: tRt [CPSR] imm8 (CPSR present for mov)
348 static bool DisassembleThumb1General(MCInst &MI, unsigned Opcode, uint32_t insn,
349 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
351 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
352 unsigned &OpIdx = NumOpsAdded;
356 assert(NumOps >= 2 && OpInfo[0].RegClass == ARM::tGPRRegClassID
357 && "Invalid arguments");
359 bool Imm3 = (Opcode == ARM::tADDi3 || Opcode == ARM::tSUBi3);
361 // Use Rt implies use imm8.
362 bool UseRt = (Opcode == ARM::tADDi8 || Opcode == ARM::tSUBi8 ||
363 Opcode == ARM::tMOVi8 || Opcode == ARM::tCMPi8);
365 // Add the destination operand.
366 MI.addOperand(MCOperand::CreateReg(
367 getRegisterEnum(B, ARM::tGPRRegClassID,
368 UseRt ? getT1tRt(insn) : getT1tRd(insn))));
371 // Check whether the next operand to be added is a CCR Register.
372 if (OpInfo[OpIdx].RegClass == ARM::CCRRegClassID) {
373 assert(OpInfo[OpIdx].isOptionalDef() && "Optional def operand expected");
374 MI.addOperand(MCOperand::CreateReg(B->InITBlock() ? 0 : ARM::CPSR));
378 // Check whether the next operand to be added is a Thumb1 Register.
379 assert(OpIdx < NumOps && "More operands expected");
380 if (OpInfo[OpIdx].RegClass == ARM::tGPRRegClassID) {
381 // For UseRt, the reg operand is tied to the first reg operand.
382 MI.addOperand(MCOperand::CreateReg(
383 getRegisterEnum(B, ARM::tGPRRegClassID,
384 UseRt ? getT1tRt(insn) : getT1tRn(insn))));
388 // Special case for tMOVSr.
392 // The next available operand is either a reg operand or an imm operand.
393 if (OpInfo[OpIdx].RegClass == ARM::tGPRRegClassID) {
394 // Three register operand instructions.
395 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::tGPRRegClassID,
398 assert(OpInfo[OpIdx].RegClass == 0 &&
399 !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()
400 && "Pure imm operand expected");
401 MI.addOperand(MCOperand::CreateImm(UseRt ? getT1Imm8(insn)
402 : (Imm3 ? getT1Imm3(insn)
403 : getT1Imm5(insn))));
410 // A6.2.2 Data-processing
412 // tCMPr, tTST, tCMN: tRd tRn
413 // tMVN, tRSB: tRd CPSR tRn
414 // Others: tRd CPSR tRd(TIED_TO) tRn
415 static bool DisassembleThumb1DP(MCInst &MI, unsigned Opcode, uint32_t insn,
416 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
418 const TargetInstrDesc &TID = ARMInsts[Opcode];
419 const TargetOperandInfo *OpInfo = TID.OpInfo;
420 unsigned &OpIdx = NumOpsAdded;
424 assert(NumOps >= 2 && OpInfo[0].RegClass == ARM::tGPRRegClassID &&
425 (OpInfo[1].RegClass == ARM::CCRRegClassID
426 || OpInfo[1].RegClass == ARM::tGPRRegClassID)
427 && "Invalid arguments");
429 // Add the destination operand.
430 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::tGPRRegClassID,
434 // Check whether the next operand to be added is a CCR Register.
435 if (OpInfo[OpIdx].RegClass == ARM::CCRRegClassID) {
436 assert(OpInfo[OpIdx].isOptionalDef() && "Optional def operand expected");
437 MI.addOperand(MCOperand::CreateReg(B->InITBlock() ? 0 : ARM::CPSR));
441 // We have either { tRd(TIED_TO), tRn } or { tRn } remaining.
442 // Process the TIED_TO operand first.
444 assert(OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::tGPRRegClassID
445 && "Thumb reg operand expected");
447 if ((Idx = TID.getOperandConstraint(OpIdx, TOI::TIED_TO)) != -1) {
448 // The reg operand is tied to the first reg operand.
449 MI.addOperand(MI.getOperand(Idx));
453 // Process possible next reg operand.
454 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::tGPRRegClassID) {
456 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::tGPRRegClassID,
464 // A6.2.3 Special data instructions and branch and exchange
466 // tADDhirr: Rd Rd(TIED_TO) Rm
468 // tMOVr, tMOVgpr2gpr, tMOVgpr2tgpr, tMOVtgpr2gpr: Rd|tRd Rm|tRn
469 // tBX_RET: 0 operand
470 // tBX_RET_vararg: Rm
472 static bool DisassembleThumb1Special(MCInst &MI, unsigned Opcode, uint32_t insn,
473 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
475 // tBX_RET has 0 operand.
479 // BX/BLX has 1 reg operand: Rm.
481 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
487 const TargetInstrDesc &TID = ARMInsts[Opcode];
488 const TargetOperandInfo *OpInfo = TID.OpInfo;
489 unsigned &OpIdx = NumOpsAdded;
493 // Add the destination operand.
494 unsigned RegClass = OpInfo[OpIdx].RegClass;
495 MI.addOperand(MCOperand::CreateReg(
496 getRegisterEnum(B, RegClass,
497 IsGPR(RegClass) ? getT1Rd(insn)
501 // We have either { Rd(TIED_TO), Rm } or { Rm|tRn } remaining.
502 // Process the TIED_TO operand first.
504 assert(OpIdx < NumOps && "More operands expected");
506 if ((Idx = TID.getOperandConstraint(OpIdx, TOI::TIED_TO)) != -1) {
507 // The reg operand is tied to the first reg operand.
508 MI.addOperand(MI.getOperand(Idx));
512 // The next reg operand is either Rm or tRn.
513 assert(OpIdx < NumOps && "More operands expected");
514 RegClass = OpInfo[OpIdx].RegClass;
515 MI.addOperand(MCOperand::CreateReg(
516 getRegisterEnum(B, RegClass,
517 IsGPR(RegClass) ? getT1Rm(insn)
524 // A8.6.59 LDR (literal)
526 // tLDRpci: tRt imm8*4
527 static bool DisassembleThumb1LdPC(MCInst &MI, unsigned Opcode, uint32_t insn,
528 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
530 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
531 if (!OpInfo) return false;
533 assert(NumOps >= 2 && OpInfo[0].RegClass == ARM::tGPRRegClassID &&
534 (OpInfo[1].RegClass == 0 &&
535 !OpInfo[1].isPredicate() &&
536 !OpInfo[1].isOptionalDef())
537 && "Invalid arguments");
539 // Add the destination operand.
540 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::tGPRRegClassID,
543 // And the (imm8 << 2) operand.
544 MI.addOperand(MCOperand::CreateImm(getT1Imm8(insn) << 2));
551 // Thumb specific addressing modes (see ARMInstrThumb.td):
553 // t_addrmode_rr := reg + reg
555 // t_addrmode_s4 := reg + reg
558 // t_addrmode_s2 := reg + reg
561 // t_addrmode_s1 := reg + reg
564 // t_addrmode_sp := sp + imm8 * 4
567 // A6.2.4 Load/store single data item
569 // Load/Store Register (reg|imm): tRd tRn imm5 tRm
570 // Load Register Signed Byte|Halfword: tRd tRn tRm
571 static bool DisassembleThumb1LdSt(unsigned opA, MCInst &MI, unsigned Opcode,
572 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
574 const TargetInstrDesc &TID = ARMInsts[Opcode];
575 const TargetOperandInfo *OpInfo = TID.OpInfo;
576 unsigned &OpIdx = NumOpsAdded;
578 // Table A6-5 16-bit Thumb Load/store instructions
579 // opA = 0b0101 for STR/LDR (register) and friends.
580 // Otherwise, we have STR/LDR (immediate) and friends.
581 bool Imm5 = (opA != 5);
584 && OpInfo[0].RegClass == ARM::tGPRRegClassID
585 && OpInfo[1].RegClass == ARM::tGPRRegClassID
586 && "Expect >= 2 operands and first two as thumb reg operands");
588 // Add the destination reg and the base reg.
589 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::tGPRRegClassID,
591 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::tGPRRegClassID,
595 // We have either { imm5, tRm } or { tRm } remaining.
596 // Process the imm5 first. Note that STR/LDR (register) should skip the imm5
597 // offset operand for t_addrmode_s[1|2|4].
599 assert(OpIdx < NumOps && "More operands expected");
601 if (OpInfo[OpIdx].RegClass == 0 && !OpInfo[OpIdx].isPredicate() &&
602 !OpInfo[OpIdx].isOptionalDef()) {
604 MI.addOperand(MCOperand::CreateImm(Imm5 ? getT1Imm5(insn) : 0));
608 // The next reg operand is tRm, the offset.
609 assert(OpIdx < NumOps && OpInfo[OpIdx].RegClass == ARM::tGPRRegClassID
610 && "Thumb reg operand expected");
611 MI.addOperand(MCOperand::CreateReg(
613 : getRegisterEnum(B, ARM::tGPRRegClassID,
620 // A6.2.4 Load/store single data item
622 // Load/Store Register SP relative: tRt ARM::SP imm8
623 static bool DisassembleThumb1LdStSP(MCInst &MI, unsigned Opcode, uint32_t insn,
624 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
626 assert((Opcode == ARM::tLDRspi || Opcode == ARM::tSTRspi)
627 && "Invalid opcode");
629 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
630 if (!OpInfo) return false;
632 assert(NumOps >= 3 &&
633 OpInfo[0].RegClass == ARM::tGPRRegClassID &&
634 OpInfo[1].RegClass == ARM::GPRRegClassID &&
635 (OpInfo[2].RegClass == 0 &&
636 !OpInfo[2].isPredicate() &&
637 !OpInfo[2].isOptionalDef())
638 && "Invalid arguments");
640 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::tGPRRegClassID,
642 MI.addOperand(MCOperand::CreateReg(ARM::SP));
643 MI.addOperand(MCOperand::CreateImm(getT1Imm8(insn)));
648 // Table A6-1 16-bit Thumb instruction encoding
651 // tADDrPCi: tRt imm8
652 static bool DisassembleThumb1AddPCi(MCInst &MI, unsigned Opcode, uint32_t insn,
653 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
655 assert(Opcode == ARM::tADDrPCi && "Invalid opcode");
657 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
658 if (!OpInfo) return false;
660 assert(NumOps >= 2 && OpInfo[0].RegClass == ARM::tGPRRegClassID &&
661 (OpInfo[1].RegClass == 0 &&
662 !OpInfo[1].isPredicate() &&
663 !OpInfo[1].isOptionalDef())
664 && "Invalid arguments");
666 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::tGPRRegClassID,
668 MI.addOperand(MCOperand::CreateImm(getT1Imm8(insn)));
673 // Table A6-1 16-bit Thumb instruction encoding
674 // A8.6.8 ADD (SP plus immediate)
676 // tADDrSPi: tRt ARM::SP imm8
677 static bool DisassembleThumb1AddSPi(MCInst &MI, unsigned Opcode, uint32_t insn,
678 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
680 assert(Opcode == ARM::tADDrSPi && "Invalid opcode");
682 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
683 if (!OpInfo) return false;
685 assert(NumOps >= 3 &&
686 OpInfo[0].RegClass == ARM::tGPRRegClassID &&
687 OpInfo[1].RegClass == ARM::GPRRegClassID &&
688 (OpInfo[2].RegClass == 0 &&
689 !OpInfo[2].isPredicate() &&
690 !OpInfo[2].isOptionalDef())
691 && "Invalid arguments");
693 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::tGPRRegClassID,
695 MI.addOperand(MCOperand::CreateReg(ARM::SP));
696 MI.addOperand(MCOperand::CreateImm(getT1Imm8(insn)));
701 // tPUSH, tPOP: Pred-Imm Pred-CCR register_list
703 // where register_list = low registers + [lr] for PUSH or
704 // low registers + [pc] for POP
706 // "low registers" is specified by Inst{7-0}
707 // lr|pc is specified by Inst{8}
708 static bool DisassembleThumb1PushPop(MCInst &MI, unsigned Opcode, uint32_t insn,
709 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
711 assert((Opcode == ARM::tPUSH || Opcode == ARM::tPOP) && "Invalid opcode");
713 unsigned &OpIdx = NumOpsAdded;
715 // Handling the two predicate operands before the reglist.
716 MI.addOperand(MCOperand::CreateImm(ARMCC::AL));
717 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
720 // Fill the variadic part of reglist.
721 unsigned RegListBits = slice(insn, 8, 8) << (Opcode == ARM::tPUSH ? 14 : 15)
723 for (unsigned i = 0; i < 16; ++i) {
724 if ((RegListBits >> i) & 1) {
725 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
734 // A6.2.5 Miscellaneous 16-bit instructions
735 // Delegate to DisassembleThumb1PushPop() for tPUSH & tPOP.
737 // tADDspi, tSUBspi: ARM::SP ARM::SP(TIED_TO) imm7
738 // t2IT: firstcond=Inst{7-4} mask=Inst{3-0}
739 // tCBNZ, tCBZ: tRd imm6*2
741 // tNOP, tSEV, tYIELD, tWFE, tWFI:
742 // no operand (except predicate pair)
743 // tSETENDBE, tSETENDLE, :
746 static bool DisassembleThumb1Misc(MCInst &MI, unsigned Opcode, uint32_t insn,
747 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
752 if (Opcode == ARM::tPUSH || Opcode == ARM::tPOP)
753 return DisassembleThumb1PushPop(MI, Opcode, insn, NumOps, NumOpsAdded, B);
755 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
757 // Predicate operands are handled elsewhere.
759 OpInfo[0].isPredicate() && OpInfo[1].isPredicate() &&
760 OpInfo[0].RegClass == 0 && OpInfo[1].RegClass == ARM::CCRRegClassID) {
764 if (Opcode == ARM::tADDspi || Opcode == ARM::tSUBspi) {
765 // Special case handling for tADDspi and tSUBspi.
766 // A8.6.8 ADD (SP plus immediate) & A8.6.215 SUB (SP minus immediate)
767 MI.addOperand(MCOperand::CreateReg(ARM::SP));
768 MI.addOperand(MCOperand::CreateReg(ARM::SP));
769 MI.addOperand(MCOperand::CreateImm(getT1Imm7(insn)));
774 if (Opcode == ARM::t2IT) {
775 // Special case handling for If-Then.
777 // Tag the (firstcond[0] bit << 4) along with mask.
780 MI.addOperand(MCOperand::CreateImm(slice(insn, 7, 4)));
782 // firstcond[0] and mask
783 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0)));
788 if (Opcode == ARM::tBKPT) {
789 MI.addOperand(MCOperand::CreateImm(getT1Imm8(insn))); // breakpoint value
794 // CPS has a singleton $opt operand that contains the following information:
795 // opt{4-0} = don't care
796 // opt{5} = 0 (false)
797 // opt{8-6} = AIF from Inst{2-0}
798 // opt{10-9} = 1:imod from Inst{4} with 0b10 as enable and 0b11 as disable
799 if (Opcode == ARM::tCPS) {
800 unsigned Option = slice(insn, 2, 0) << 6 | slice(insn, 4, 4) << 9 | 1 << 10;
801 MI.addOperand(MCOperand::CreateImm(Option));
806 assert(NumOps >= 2 && OpInfo[0].RegClass == ARM::tGPRRegClassID &&
807 (OpInfo[1].RegClass==0 || OpInfo[1].RegClass==ARM::tGPRRegClassID)
808 && "Expect >=2 operands");
810 // Add the destination operand.
811 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::tGPRRegClassID,
814 if (OpInfo[1].RegClass == ARM::tGPRRegClassID) {
815 // Two register instructions.
816 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::tGPRRegClassID,
820 assert((Opcode == ARM::tCBNZ || Opcode == ARM::tCBZ) && "Invalid opcode");
821 MI.addOperand(MCOperand::CreateImm(getT1Imm6(insn) * 2));
829 // A8.6.53 LDM / LDMIA
830 // A8.6.189 STM / STMIA
832 // tLDM_UPD/tSTM_UPD: tRt tRt AM4ModeImm Pred-Imm Pred-CCR register_list
833 // tLDM: tRt AM4ModeImm Pred-Imm Pred-CCR register_list
834 static bool DisassembleThumb1LdStMul(bool Ld, MCInst &MI, unsigned Opcode,
835 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
837 assert((Opcode == ARM::tLDM || Opcode == ARM::tLDM_UPD ||
838 Opcode == ARM::tSTM_UPD) && "Invalid opcode");
840 unsigned &OpIdx = NumOpsAdded;
842 unsigned tRt = getT1tRt(insn);
843 unsigned RegListBits = slice(insn, 7, 0);
847 // WB register, if necessary.
848 if (Opcode == ARM::tLDM_UPD || Opcode == ARM::tSTM_UPD) {
849 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
854 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
858 // A8.6.53 LDM / LDMIA / LDMFD - Encoding T1
859 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM4ModeImm(ARM_AM::ia)));
862 // Handling the two predicate operands before the reglist.
863 MI.addOperand(MCOperand::CreateImm(ARMCC::AL));
864 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
867 // Fill the variadic part of reglist.
868 for (unsigned i = 0; i < 8; ++i) {
869 if ((RegListBits >> i) & 1) {
870 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::tGPRRegClassID,
879 static bool DisassembleThumb1LdMul(MCInst &MI, unsigned Opcode, uint32_t insn,
880 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
881 return DisassembleThumb1LdStMul(true, MI, Opcode, insn, NumOps, NumOpsAdded,
885 static bool DisassembleThumb1StMul(MCInst &MI, unsigned Opcode, uint32_t insn,
886 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
887 return DisassembleThumb1LdStMul(false, MI, Opcode, insn, NumOps, NumOpsAdded,
891 // A8.6.16 B Encoding T1
892 // cond = Inst{11-8} & imm8 = Inst{7-0}
893 // imm32 = SignExtend(imm8:'0', 32)
895 // tBcc: offset Pred-Imm Pred-CCR
896 // tSVC: imm8 Pred-Imm Pred-CCR
897 // tTRAP: 0 operand (early return)
898 static bool DisassembleThumb1CondBr(MCInst &MI, unsigned Opcode, uint32_t insn,
899 unsigned short NumOps, unsigned &NumOpsAdded, BO) {
901 if (Opcode == ARM::tTRAP)
904 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
905 if (!OpInfo) return false;
907 assert(NumOps == 3 && OpInfo[0].RegClass == 0 &&
908 OpInfo[1].isPredicate() && OpInfo[2].RegClass == ARM::CCRRegClassID
909 && "Exactly 3 operands expected");
911 unsigned Imm8 = getT1Imm8(insn);
912 MI.addOperand(MCOperand::CreateImm(
913 Opcode == ARM::tBcc ? SignExtend32<9>(Imm8 << 1) + 4
916 // Predicate operands by ARMBasicMCBuilder::TryPredicateAndSBitModifier().
922 // A8.6.16 B Encoding T2
923 // imm11 = Inst{10-0}
924 // imm32 = SignExtend(imm11:'0', 32)
927 static bool DisassembleThumb1Br(MCInst &MI, unsigned Opcode, uint32_t insn,
928 unsigned short NumOps, unsigned &NumOpsAdded, BO) {
930 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
931 if (!OpInfo) return false;
933 assert(NumOps == 1 && OpInfo[0].RegClass == 0 && "1 imm operand expected");
935 unsigned Imm11 = getT1Imm11(insn);
937 // When executing a Thumb instruction, PC reads as the address of the current
938 // instruction plus 4. The assembler subtracts 4 from the difference between
939 // the branch instruction and the target address, disassembler has to add 4 to
941 MI.addOperand(MCOperand::CreateImm(SignExtend32<12>(Imm11 << 1) + 4));
949 // See A6.2 16-bit Thumb instruction encoding for instruction classes
950 // corresponding to op.
952 // Table A6-1 16-bit Thumb instruction encoding (abridged)
953 // op Instruction or instruction class
954 // ------ --------------------------------------------------------------------
955 // 00xxxx Shift (immediate), add, subtract, move, and compare on page A6-7
956 // 010000 Data-processing on page A6-8
957 // 010001 Special data instructions and branch and exchange on page A6-9
958 // 01001x Load from Literal Pool, see LDR (literal) on page A8-122
959 // 0101xx Load/store single data item on page A6-10
962 // 10100x Generate PC-relative address, see ADR on page A8-32
963 // 10101x Generate SP-relative address, see ADD (SP plus immediate) on page A8-28
964 // 1011xx Miscellaneous 16-bit instructions on page A6-11
965 // 11000x Store multiple registers, see STM / STMIA / STMEA on page A8-374
966 // 11001x Load multiple registers, see LDM / LDMIA / LDMFD on page A8-110 a
967 // 1101xx Conditional branch, and Supervisor Call on page A6-13
968 // 11100x Unconditional Branch, see B on page A8-44
970 static bool DisassembleThumb1(uint16_t op, MCInst &MI, unsigned Opcode,
971 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
973 unsigned op1 = slice(op, 5, 4);
974 unsigned op2 = slice(op, 3, 2);
975 unsigned op3 = slice(op, 1, 0);
976 unsigned opA = slice(op, 5, 2);
979 // A6.2.1 Shift (immediate), add, subtract, move, and compare
980 return DisassembleThumb1General(MI, Opcode, insn, NumOps, NumOpsAdded, B);
986 // A6.2.2 Data-processing
987 return DisassembleThumb1DP(MI, Opcode, insn, NumOps, NumOpsAdded, B);
989 // A6.2.3 Special data instructions and branch and exchange
990 return DisassembleThumb1Special(MI, Opcode, insn, NumOps, NumOpsAdded,
993 // A8.6.59 LDR (literal)
994 return DisassembleThumb1LdPC(MI, Opcode, insn, NumOps, NumOpsAdded, B);
998 // A6.2.4 Load/store single data item
999 return DisassembleThumb1LdSt(opA, MI, Opcode, insn, NumOps, NumOpsAdded,
1007 // A6.2.4 Load/store single data item
1008 return DisassembleThumb1LdSt(opA, MI, Opcode, insn, NumOps, NumOpsAdded,
1011 // A6.2.4 Load/store single data item
1012 return DisassembleThumb1LdStSP(MI, Opcode, insn, NumOps, NumOpsAdded, B);
1016 return DisassembleThumb1AddPCi(MI, Opcode, insn, NumOps, NumOpsAdded,
1019 // A8.6.8 ADD (SP plus immediate)
1020 return DisassembleThumb1AddSPi(MI, Opcode, insn, NumOps, NumOpsAdded,
1024 // A6.2.5 Miscellaneous 16-bit instructions
1025 return DisassembleThumb1Misc(MI, Opcode, insn, NumOps, NumOpsAdded, B);
1032 // A8.6.189 STM / STMIA / STMEA
1033 return DisassembleThumb1StMul(MI, Opcode, insn, NumOps, NumOpsAdded, B);
1035 // A8.6.53 LDM / LDMIA / LDMFD
1036 return DisassembleThumb1LdMul(MI, Opcode, insn, NumOps, NumOpsAdded, B);
1039 // A6.2.6 Conditional branch, and Supervisor Call
1040 return DisassembleThumb1CondBr(MI, Opcode, insn, NumOps, NumOpsAdded, B);
1042 // Unconditional Branch, see B on page A8-44
1043 return DisassembleThumb1Br(MI, Opcode, insn, NumOps, NumOpsAdded, B);
1045 assert(0 && "Unreachable code");
1050 assert(0 && "Unreachable code");
1057 ///////////////////////////////////////////////
1059 // Thumb2 instruction disassembly functions. //
1061 ///////////////////////////////////////////////
1063 ///////////////////////////////////////////////////////////
1065 // Note: the register naming follows the ARM convention! //
1067 ///////////////////////////////////////////////////////////
1069 static inline bool Thumb2SRSOpcode(unsigned Opcode) {
1073 case ARM::t2SRSDBW: case ARM::t2SRSDB:
1074 case ARM::t2SRSIAW: case ARM::t2SRSIA:
1079 static inline bool Thumb2RFEOpcode(unsigned Opcode) {
1083 case ARM::t2RFEDBW: case ARM::t2RFEDB:
1084 case ARM::t2RFEIAW: case ARM::t2RFEIA:
1089 // t2SRS[IA|DB]W/t2SRS[IA|DB]: mode_imm = Inst{4-0}
1090 static bool DisassembleThumb2SRS(MCInst &MI, unsigned Opcode, uint32_t insn,
1091 unsigned short NumOps, unsigned &NumOpsAdded) {
1092 MI.addOperand(MCOperand::CreateImm(slice(insn, 4, 0)));
1097 // t2RFE[IA|DB]W/t2RFE[IA|DB]: Rn
1098 static bool DisassembleThumb2RFE(MCInst &MI, unsigned Opcode, uint32_t insn,
1099 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1100 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1106 static bool DisassembleThumb2LdStMul(MCInst &MI, unsigned Opcode, uint32_t insn,
1107 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1109 if (Thumb2SRSOpcode(Opcode))
1110 return DisassembleThumb2SRS(MI, Opcode, insn, NumOps, NumOpsAdded);
1112 if (Thumb2RFEOpcode(Opcode))
1113 return DisassembleThumb2RFE(MI, Opcode, insn, NumOps, NumOpsAdded, B);
1115 assert((Opcode == ARM::t2LDM || Opcode == ARM::t2LDM_UPD ||
1116 Opcode == ARM::t2STM || Opcode == ARM::t2STM_UPD)
1117 && "Invalid opcode");
1118 assert(NumOps >= 5 && "Thumb2 LdStMul expects NumOps >= 5");
1120 unsigned &OpIdx = NumOpsAdded;
1124 unsigned Base = getRegisterEnum(B, ARM::GPRRegClassID, decodeRn(insn));
1126 // Writeback to base.
1127 if (Opcode == ARM::t2LDM_UPD || Opcode == ARM::t2STM_UPD) {
1128 MI.addOperand(MCOperand::CreateReg(Base));
1132 MI.addOperand(MCOperand::CreateReg(Base));
1135 ARM_AM::AMSubMode SubMode = getAMSubModeForBits(getPUBits(insn));
1136 MI.addOperand(MCOperand::CreateImm(ARM_AM::getAM4ModeImm(SubMode)));
1139 // Handling the two predicate operands before the reglist.
1140 MI.addOperand(MCOperand::CreateImm(ARMCC::AL));
1141 MI.addOperand(MCOperand::CreateReg(ARM::CPSR));
1144 // Fill the variadic part of reglist.
1145 unsigned RegListBits = insn & ((1 << 16) - 1);
1146 for (unsigned i = 0; i < 16; ++i) {
1147 if ((RegListBits >> i) & 1) {
1148 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1158 // t2LDREXD: Rd Rs Rn
1159 // t2LDREXB, t2LDREXH: Rd Rn
1160 // t2STREX: Rs Rd Rn
1161 // t2STREXD: Rm Rd Rs Rn
1162 // t2STREXB, t2STREXH: Rm Rd Rn
1163 static bool DisassembleThumb2LdStEx(MCInst &MI, unsigned Opcode, uint32_t insn,
1164 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1166 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1167 if (!OpInfo) return false;
1169 unsigned &OpIdx = NumOpsAdded;
1174 && OpInfo[0].RegClass == ARM::GPRRegClassID
1175 && OpInfo[1].RegClass == ARM::GPRRegClassID
1176 && "Expect >=2 operands and first two as reg operands");
1178 bool isStore = (ARM::t2STREX <= Opcode && Opcode <= ARM::t2STREXH);
1179 bool isSW = (Opcode == ARM::t2LDREX || Opcode == ARM::t2STREX);
1180 bool isDW = (Opcode == ARM::t2LDREXD || Opcode == ARM::t2STREXD);
1182 // Add the destination operand for store.
1184 MI.addOperand(MCOperand::CreateReg(
1185 getRegisterEnum(B, ARM::GPRRegClassID,
1186 isSW ? decodeRs(insn) : decodeRm(insn))));
1190 // Source operand for store and destination operand for load.
1191 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1195 // Thumb2 doubleword complication: with an extra source/destination operand.
1197 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1202 // Finally add the pointer operand.
1203 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1210 // LLVM, as of Jan-05-2010, does not output <Rt2>, i.e., Rs, in the asm.
1211 // Whereas the ARM Arch. Manual does not require that t2 = t+1 like in ARM ISA.
1213 // t2LDRDi8: Rd Rs Rn imm8s4 (offset mode)
1214 // t2LDRDpci: Rd Rs imm8s4 (Not decoded, prefer the generic t2LDRDi8 version)
1215 // t2STRDi8: Rd Rs Rn imm8s4 (offset mode)
1217 // Ditto for t2LDRD_PRE, t2LDRD_POST, t2STRD_PRE, t2STRD_POST, which are for
1218 // disassembly only and do not have a tied_to writeback base register operand.
1219 static bool DisassembleThumb2LdStDual(MCInst &MI, unsigned Opcode,
1220 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1222 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1223 if (!OpInfo) return false;
1226 && OpInfo[0].RegClass == ARM::GPRRegClassID
1227 && OpInfo[1].RegClass == ARM::GPRRegClassID
1228 && OpInfo[2].RegClass == ARM::GPRRegClassID
1229 && OpInfo[3].RegClass == 0
1230 && "Expect >= 4 operands and first 3 as reg operands");
1232 // Add the <Rt> <Rt2> operands.
1233 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1235 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1237 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1240 // Finally add (+/-)imm8*4, depending on the U bit.
1241 int Offset = getImm8(insn) * 4;
1242 if (getUBit(insn) == 0)
1244 MI.addOperand(MCOperand::CreateImm(Offset));
1250 // PC-based defined for Codegen, which do not get decoded by design:
1252 // t2TBB, t2TBH: Rm immDontCare immDontCare
1254 // Generic version defined for disassembly:
1256 // t2TBBgen, t2TBHgen: Rn Rm Pred-Imm Pred-CCR
1257 static bool DisassembleThumb2TB(MCInst &MI, unsigned Opcode,
1258 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1260 assert(NumOps >= 2 && "Expect >= 2 operands");
1262 // The generic version of TBB/TBH needs a base register.
1263 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1265 // Add the index register.
1266 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1273 static inline bool Thumb2ShiftOpcode(unsigned Opcode) {
1277 case ARM::t2MOVCClsl: case ARM::t2MOVCClsr:
1278 case ARM::t2MOVCCasr: case ARM::t2MOVCCror:
1279 case ARM::t2LSLri: case ARM::t2LSRri:
1280 case ARM::t2ASRri: case ARM::t2RORri:
1285 // A6.3.11 Data-processing (shifted register)
1287 // Two register operands (Rn=0b1111 no 1st operand reg): Rs Rm
1288 // Two register operands (Rs=0b1111 no dst operand reg): Rn Rm
1289 // Three register operands: Rs Rn Rm
1290 // Three register operands: (Rn=0b1111 Conditional Move) Rs Ro(TIED_TO) Rm
1292 // Constant shifts t2_so_reg is a 2-operand unit corresponding to the Thumb2
1293 // register with shift forms: (Rm, ConstantShiftSpecifier).
1294 // Constant shift specifier: Imm = (ShOp | ShAmt<<3).
1296 // There are special instructions, like t2MOVsra_flag and t2MOVsrl_flag, which
1297 // only require two register operands: Rd, Rm in ARM Reference Manual terms, and
1298 // nothing else, because the shift amount is already specified.
1299 // Similar case holds for t2MOVrx, t2ADDrr, ..., etc.
1300 static bool DisassembleThumb2DPSoReg(MCInst &MI, unsigned Opcode, uint32_t insn,
1301 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1303 const TargetInstrDesc &TID = ARMInsts[Opcode];
1304 const TargetOperandInfo *OpInfo = TID.OpInfo;
1305 unsigned &OpIdx = NumOpsAdded;
1307 // Special case handling.
1308 if (Opcode == ARM::t2BR_JT) {
1310 && OpInfo[0].RegClass == ARM::GPRRegClassID
1311 && OpInfo[1].RegClass == ARM::GPRRegClassID
1312 && OpInfo[2].RegClass == 0
1313 && OpInfo[3].RegClass == 0
1314 && "Exactlt 4 operands expect and first two as reg operands");
1315 // Only need to populate the src reg operand.
1316 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1318 MI.addOperand(MCOperand::CreateReg(0));
1319 MI.addOperand(MCOperand::CreateImm(0));
1320 MI.addOperand(MCOperand::CreateImm(0));
1328 && OpInfo[0].RegClass == ARM::GPRRegClassID
1329 && OpInfo[1].RegClass == ARM::GPRRegClassID
1330 && "Expect >= 2 operands and first two as reg operands");
1332 bool ThreeReg = (NumOps > 2 && OpInfo[2].RegClass == ARM::GPRRegClassID);
1333 bool NoDstReg = (decodeRs(insn) == 0xF);
1335 // Build the register operands, followed by the constant shift specifier.
1337 MI.addOperand(MCOperand::CreateReg(
1338 getRegisterEnum(B, ARM::GPRRegClassID,
1339 NoDstReg ? decodeRn(insn) : decodeRs(insn))));
1344 if ((Idx = TID.getOperandConstraint(OpIdx, TOI::TIED_TO)) != -1) {
1345 // Process tied_to operand constraint.
1346 MI.addOperand(MI.getOperand(Idx));
1348 } else if (!NoDstReg) {
1349 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1353 DEBUG(errs() << "Thumb encoding error: d==15 for three-reg operands.\n");
1358 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1362 if (NumOps == OpIdx)
1365 if (OpInfo[OpIdx].RegClass == 0 && !OpInfo[OpIdx].isPredicate()
1366 && !OpInfo[OpIdx].isOptionalDef()) {
1368 if (Thumb2ShiftOpcode(Opcode))
1369 MI.addOperand(MCOperand::CreateImm(getShiftAmtBits(insn)));
1371 // Build the constant shift specifier operand.
1372 unsigned bits2 = getShiftTypeBits(insn);
1373 unsigned imm5 = getShiftAmtBits(insn);
1374 ARM_AM::ShiftOpc ShOp = ARM_AM::no_shift;
1375 unsigned ShAmt = decodeImmShift(bits2, imm5, ShOp);
1377 // PKHBT/PKHTB are special in that we need the decodeImmShift() call to
1378 // decode the shift amount from raw imm5 and bits2, but we DO NOT need
1379 // to encode the ShOp, as it's in the asm string already.
1380 if (Opcode == ARM::t2PKHBT || Opcode == ARM::t2PKHTB)
1381 MI.addOperand(MCOperand::CreateImm(ShAmt));
1383 MI.addOperand(MCOperand::CreateImm(ARM_AM::getSORegOpc(ShOp, ShAmt)));
1391 // A6.3.1 Data-processing (modified immediate)
1393 // Two register operands: Rs Rn ModImm
1394 // One register operands (Rs=0b1111 no explicit dest reg): Rn ModImm
1395 // One register operands (Rn=0b1111 no explicit src reg): Rs ModImm - {t2MOVi, t2MVNi}
1397 // ModImm = ThumbExpandImm(i:imm3:imm8)
1398 static bool DisassembleThumb2DPModImm(MCInst &MI, unsigned Opcode,
1399 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1401 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1402 unsigned &OpIdx = NumOpsAdded;
1406 assert(NumOps >= 2 && OpInfo[0].RegClass == ARM::GPRRegClassID
1407 && "Expect >= 2 operands and first one as reg operand");
1409 bool TwoReg = (OpInfo[1].RegClass == ARM::GPRRegClassID);
1410 bool NoDstReg = (decodeRs(insn) == 0xF);
1412 // Build the register operands, followed by the modified immediate.
1414 MI.addOperand(MCOperand::CreateReg(
1415 getRegisterEnum(B, ARM::GPRRegClassID,
1416 NoDstReg ? decodeRn(insn) : decodeRs(insn))));
1421 DEBUG(errs() << "Thumb encoding error: d==15 for DPModImm 2-reg instr.\n");
1424 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1429 // The modified immediate operand should come next.
1430 assert(OpIdx < NumOps && OpInfo[OpIdx].RegClass == 0 &&
1431 !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()
1432 && "Pure imm operand expected");
1435 // A6.3.2 Modified immediate constants in Thumb instructions
1436 unsigned imm12 = getIImm3Imm8(insn);
1437 MI.addOperand(MCOperand::CreateImm(ThumbExpandImm(imm12)));
1443 static inline bool Thumb2SaturateOpcode(unsigned Opcode) {
1445 case ARM::t2SSATlsl: case ARM::t2SSATasr: case ARM::t2SSAT16:
1446 case ARM::t2USATlsl: case ARM::t2USATasr: case ARM::t2USAT16:
1453 static inline unsigned decodeThumb2SaturatePos(unsigned Opcode, uint32_t insn) {
1455 case ARM::t2SSATlsl:
1456 case ARM::t2SSATasr:
1457 return slice(insn, 4, 0) + 1;
1459 return slice(insn, 3, 0) + 1;
1460 case ARM::t2USATlsl:
1461 case ARM::t2USATasr:
1462 return slice(insn, 4, 0);
1464 return slice(insn, 3, 0);
1466 assert(0 && "Invalid opcode passed in");
1471 // A6.3.3 Data-processing (plain binary immediate)
1473 // o t2ADDri12, t2SUBri12: Rs Rn imm12
1474 // o t2LEApcrel (ADR): Rs imm12
1475 // o t2BFC (BFC): Rs Ro(TIED_TO) bf_inv_mask_imm
1476 // o t2BFI (BFI) (Currently not defined in LLVM as of Jan-07-2010)
1477 // o t2MOVi16: Rs imm16
1478 // o t2MOVTi16: Rs imm16
1479 // o t2SBFX (SBFX): Rs Rn lsb width
1480 // o t2UBFX (UBFX): Rs Rn lsb width
1481 // o t2BFI (BFI): Rs Rn lsb width
1483 // [Signed|Unsigned] Saturate [16]
1485 // o t2SSAT[lsl|asr], t2USAT[lsl|asr]: Rs sat_pos Rn shamt
1486 // o t2SSAT16, t2USAT16: Rs sat_pos Rn
1487 static bool DisassembleThumb2DPBinImm(MCInst &MI, unsigned Opcode,
1488 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1490 const TargetInstrDesc &TID = ARMInsts[Opcode];
1491 const TargetOperandInfo *OpInfo = TID.OpInfo;
1492 unsigned &OpIdx = NumOpsAdded;
1496 assert(NumOps >= 2 && OpInfo[0].RegClass == ARM::GPRRegClassID
1497 && "Expect >= 2 operands and first one as reg operand");
1499 bool TwoReg = (OpInfo[1].RegClass == ARM::GPRRegClassID);
1501 // Build the register operand(s), followed by the immediate(s).
1503 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1507 // t2SSAT/t2SSAT16/t2USAT/t2USAT16 has imm operand after Rd.
1508 if (Thumb2SaturateOpcode(Opcode)) {
1509 MI.addOperand(MCOperand::CreateImm(decodeThumb2SaturatePos(Opcode, insn)));
1511 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1514 if (Opcode == ARM::t2SSAT16 || Opcode == ARM::t2USAT16) {
1519 // For SSAT operand reg (Rn) has been disassembled above.
1520 // Now disassemble the shift amount.
1522 // Inst{14-12:7-6} encodes the imm5 shift amount.
1523 unsigned ShAmt = slice(insn, 14, 12) << 2 | slice(insn, 7, 6);
1525 MI.addOperand(MCOperand::CreateImm(ShAmt));
1532 assert(NumOps >= 3 && "Expect >= 3 operands");
1534 if ((Idx = TID.getOperandConstraint(OpIdx, TOI::TIED_TO)) != -1) {
1535 // Process tied_to operand constraint.
1536 MI.addOperand(MI.getOperand(Idx));
1538 // Add src reg operand.
1539 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1545 assert(OpInfo[OpIdx].RegClass == 0 && !OpInfo[OpIdx].isPredicate()
1546 && !OpInfo[OpIdx].isOptionalDef()
1547 && "Pure imm operand expected");
1549 // Pre-increment OpIdx.
1552 if (Opcode == ARM::t2ADDri12 || Opcode == ARM::t2SUBri12
1553 || Opcode == ARM::t2LEApcrel)
1554 MI.addOperand(MCOperand::CreateImm(getIImm3Imm8(insn)));
1555 else if (Opcode == ARM::t2MOVi16 || Opcode == ARM::t2MOVTi16)
1556 MI.addOperand(MCOperand::CreateImm(getImm16(insn)));
1557 else if (Opcode == ARM::t2BFC) {
1559 if (getBitfieldInvMask(insn, mask))
1560 MI.addOperand(MCOperand::CreateImm(mask));
1564 // Handle the case of: lsb width
1565 assert((Opcode == ARM::t2SBFX || Opcode == ARM::t2UBFX ||
1566 Opcode == ARM::t2BFI) && "Invalid opcode");
1567 MI.addOperand(MCOperand::CreateImm(getLsb(insn)));
1568 if (Opcode == ARM::t2BFI) {
1569 if (getMsb(insn) < getLsb(insn)) {
1570 DEBUG(errs() << "Encoding error: msb < lsb\n");
1573 MI.addOperand(MCOperand::CreateImm(getMsb(insn) - getLsb(insn) + 1));
1575 MI.addOperand(MCOperand::CreateImm(getWidthMinus1(insn) + 1));
1583 // A6.3.4 Table A6-15 Miscellaneous control instructions
1587 static inline bool t2MiscCtrlInstr(uint32_t insn) {
1588 if (slice(insn, 31, 20) == 0xf3b && slice(insn, 15, 14) == 2 &&
1589 slice(insn, 12, 12) == 0)
1595 // A6.3.4 Branches and miscellaneous control
1598 // Branches: t2B, t2Bcc -> imm operand
1600 // Branches: t2TPsoft -> no operand
1602 // A8.6.23 BL, BLX (immediate)
1603 // Branches (defined in ARMInstrThumb.td): tBLr9, tBLXi_r9 -> imm operand
1608 // Miscellaneous control: t2Int_MemBarrierV7 (and its t2DMB variants),
1609 // t2Int_SyncBarrierV7 (and its t2DSB varianst), t2ISBsy, t2CLREX
1610 // -> no operand (except pred-imm pred-ccr for CLREX, memory barrier variants)
1612 // Hint: t2NOP, t2YIELD, t2WFE, t2WFI, t2SEV
1613 // -> no operand (except pred-imm pred-ccr)
1615 // t2DBG -> imm4 = Inst{3-0}
1617 // t2MRS/t2MRSsys -> Rs
1618 // t2MSR/t2MSRsys -> Rn mask=Inst{11-8}
1619 // t2SMC -> imm4 = Inst{19-16}
1620 static bool DisassembleThumb2BrMiscCtrl(MCInst &MI, unsigned Opcode,
1621 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1626 if (t2MiscCtrlInstr(insn))
1641 // CPS has a singleton $opt operand that contains the following information:
1642 // opt{4-0} = mode from Inst{4-0}
1643 // opt{5} = changemode from Inst{8}
1644 // opt{8-6} = AIF from Inst{7-5}
1645 // opt{10-9} = imod from Inst{10-9} with 0b10 as enable and 0b11 as disable
1646 if (Opcode == ARM::t2CPS) {
1647 unsigned Option = slice(insn, 4, 0) | slice(insn, 8, 8) << 5 |
1648 slice(insn, 7, 5) << 6 | slice(insn, 10, 9) << 9;
1649 MI.addOperand(MCOperand::CreateImm(Option));
1654 // DBG has its option specified in Inst{3-0}.
1655 if (Opcode == ARM::t2DBG) {
1656 MI.addOperand(MCOperand::CreateImm(slice(insn, 3, 0)));
1661 // MRS and MRSsys take one GPR reg Rs.
1662 if (Opcode == ARM::t2MRS || Opcode == ARM::t2MRSsys) {
1663 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1668 // BXJ takes one GPR reg Rn.
1669 if (Opcode == ARM::t2BXJ) {
1670 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1675 // MSR and MSRsys take one GPR reg Rn, followed by the mask.
1676 if (Opcode == ARM::t2MSR || Opcode == ARM::t2MSRsys || Opcode == ARM::t2BXJ) {
1677 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1679 MI.addOperand(MCOperand::CreateImm(slice(insn, 11, 8)));
1684 if (Opcode == ARM::t2SMC) {
1685 MI.addOperand(MCOperand::CreateImm(slice(insn, 19, 16)));
1690 // Add the imm operand.
1695 assert(0 && "Unreachable code");
1698 Offset = decodeImm32_B_EncodingT4(insn);
1701 Offset = decodeImm32_B_EncodingT3(insn);
1704 Offset = decodeImm32_BL(insn);
1707 Offset = decodeImm32_BLX(insn);
1710 // When executing a Thumb instruction, PC reads as the address of the current
1711 // instruction plus 4. The assembler subtracts 4 from the difference between
1712 // the branch instruction and the target address, disassembler has to add 4 to
1714 MI.addOperand(MCOperand::CreateImm(Offset + 4));
1721 static inline bool Thumb2PreloadOpcode(unsigned Opcode) {
1725 case ARM::t2PLDi12: case ARM::t2PLDi8: case ARM::t2PLDpci:
1726 case ARM::t2PLDr: case ARM::t2PLDs:
1727 case ARM::t2PLDWi12: case ARM::t2PLDWi8: case ARM::t2PLDWpci:
1728 case ARM::t2PLDWr: case ARM::t2PLDWs:
1729 case ARM::t2PLIi12: case ARM::t2PLIi8: case ARM::t2PLIpci:
1730 case ARM::t2PLIr: case ARM::t2PLIs:
1735 static bool DisassembleThumb2PreLoad(MCInst &MI, unsigned Opcode, uint32_t insn,
1736 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1738 // Preload Data/Instruction requires either 2 or 3 operands.
1739 // t2PLDi12, t2PLDi8, t2PLDpci: Rn [+/-]imm12/imm8
1741 // t2PLDs: Rn Rm imm2=Inst{5-4}
1742 // Same pattern applies for t2PLDW* and t2PLI*.
1744 const TargetInstrDesc &TID = ARMInsts[Opcode];
1745 const TargetOperandInfo *OpInfo = TID.OpInfo;
1746 unsigned &OpIdx = NumOpsAdded;
1750 assert(NumOps >= 2 &&
1751 OpInfo[0].RegClass == ARM::GPRRegClassID &&
1752 "Expect >= 2 operands and first one as reg operand");
1754 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1758 if (OpInfo[OpIdx].RegClass == ARM::GPRRegClassID) {
1759 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1762 assert(OpInfo[OpIdx].RegClass == 0 && !OpInfo[OpIdx].isPredicate()
1763 && !OpInfo[OpIdx].isOptionalDef()
1764 && "Pure imm operand expected");
1766 if (Opcode == ARM::t2PLDpci || Opcode == ARM::t2PLDWpci ||
1767 Opcode == ARM::t2PLIpci) {
1768 bool Negative = slice(insn, 23, 23) == 0;
1769 unsigned Imm12 = getImm12(insn);
1770 Offset = Negative ? -1 - Imm12 : 1 * Imm12;
1771 } else if (Opcode == ARM::t2PLDi8 || Opcode == ARM::t2PLDWi8 ||
1772 Opcode == ARM::t2PLIi8) {
1773 // A8.6.117 Encoding T2: add = FALSE
1774 unsigned Imm8 = getImm8(insn);
1776 } else // The i12 forms. See, for example, A8.6.117 Encoding T1.
1777 Offset = decodeImm12(insn);
1778 MI.addOperand(MCOperand::CreateImm(Offset));
1782 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass == 0 &&
1783 !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1784 // Fills in the shift amount for t2PLDs, t2PLDWs, t2PLIs.
1785 MI.addOperand(MCOperand::CreateImm(slice(insn, 5, 4)));
1792 // A8.6.63 LDRB (literal)
1793 // A8.6.79 LDRSB (literal)
1794 // A8.6.75 LDRH (literal)
1795 // A8.6.83 LDRSH (literal)
1796 // A8.6.59 LDR (literal)
1798 // These instrs calculate an address from the PC value and an immediate offset.
1799 // Rd Rn=PC (+/-)imm12 (+ if Inst{23} == 0b1)
1800 static bool DisassembleThumb2Ldpci(MCInst &MI, unsigned Opcode,
1801 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1803 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1804 if (!OpInfo) return false;
1806 assert(NumOps >= 2 &&
1807 OpInfo[0].RegClass == ARM::GPRRegClassID &&
1808 OpInfo[1].RegClass == 0 &&
1809 "Expect >= 2 operands, first as reg, and second as imm operand");
1811 // Build the register operand, followed by the (+/-)imm12 immediate.
1813 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1816 MI.addOperand(MCOperand::CreateImm(decodeImm12(insn)));
1823 // A6.3.10 Store single data item
1824 // A6.3.9 Load byte, memory hints
1825 // A6.3.8 Load halfword, memory hints
1830 // t2LDRi12: Rd Rn (+)imm12
1831 // t2LDRi8: Rd Rn (+/-)imm8 (+ if Inst{9} == 0b1)
1832 // t2LDRs: Rd Rn Rm ConstantShiftSpecifier (see also DisassembleThumb2DPSoReg)
1833 // t2LDR_POST: Rd Rn Rn(TIED_TO) (+/-)imm8 (+ if Inst{9} == 0b1)
1834 // t2LDR_PRE: Rd Rn Rn(TIED_TO) (+/-)imm8 (+ if Inst{9} == 0b1)
1836 // t2STRi12: Rd Rn (+)imm12
1837 // t2STRi8: Rd Rn (+/-)imm8 (+ if Inst{9} == 0b1)
1838 // t2STRs: Rd Rn Rm ConstantShiftSpecifier (see also DisassembleThumb2DPSoReg)
1839 // t2STR_POST: Rn Rd Rn(TIED_TO) (+/-)imm8 (+ if Inst{9} == 0b1)
1840 // t2STR_PRE: Rn Rd Rn(TIED_TO) (+/-)imm8 (+ if Inst{9} == 0b1)
1842 // Note that for indexed modes, the Rn(TIED_TO) operand needs to be populated
1843 // correctly, as LLVM AsmPrinter depends on it. For indexed stores, the first
1844 // operand is Rn; for all the other instructions, Rd is the first operand.
1846 // Delegates to DisassembleThumb2PreLoad() for preload data/instruction.
1847 // Delegates to DisassembleThumb2Ldpci() for load * literal operations.
1848 static bool DisassembleThumb2LdSt(bool Load, MCInst &MI, unsigned Opcode,
1849 uint32_t insn, unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1851 unsigned Rn = decodeRn(insn);
1853 if (Thumb2PreloadOpcode(Opcode))
1854 return DisassembleThumb2PreLoad(MI, Opcode, insn, NumOps, NumOpsAdded, B);
1856 // See, for example, A6.3.7 Load word: Table A6-18 Load word.
1857 if (Load && Rn == 15)
1858 return DisassembleThumb2Ldpci(MI, Opcode, insn, NumOps, NumOpsAdded, B);
1860 const TargetInstrDesc &TID = ARMInsts[Opcode];
1861 const TargetOperandInfo *OpInfo = TID.OpInfo;
1862 unsigned &OpIdx = NumOpsAdded;
1866 assert(NumOps >= 3 &&
1867 OpInfo[0].RegClass == ARM::GPRRegClassID &&
1868 OpInfo[1].RegClass == ARM::GPRRegClassID &&
1869 "Expect >= 3 operands and first two as reg operands");
1871 bool ThreeReg = (OpInfo[2].RegClass == ARM::GPRRegClassID);
1872 bool TIED_TO = ThreeReg && TID.getOperandConstraint(2, TOI::TIED_TO) != -1;
1873 bool Imm12 = !ThreeReg && slice(insn, 23, 23) == 1; // ARMInstrThumb2.td
1875 // Build the register operands, followed by the immediate.
1876 unsigned R0, R1, R2 = 0;
1877 unsigned Rd = decodeRd(insn);
1880 if (!Load && TIED_TO) {
1890 Imm = decodeImm8(insn);
1892 R2 = decodeRm(insn);
1893 // See, for example, A8.6.64 LDRB (register).
1894 // And ARMAsmPrinter::printT2AddrModeSoRegOperand().
1895 // LSL is the default shift opc, and LLVM does not expect it to be encoded
1896 // as part of the immediate operand.
1897 // Imm = ARM_AM::getSORegOpc(ARM_AM::lsl, slice(insn, 5, 4));
1898 Imm = slice(insn, 5, 4);
1902 Imm = getImm12(insn);
1904 Imm = decodeImm8(insn);
1907 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1910 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1915 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1920 assert(OpInfo[OpIdx].RegClass == 0 && !OpInfo[OpIdx].isPredicate()
1921 && !OpInfo[OpIdx].isOptionalDef()
1922 && "Pure imm operand expected");
1924 MI.addOperand(MCOperand::CreateImm(Imm));
1930 // A6.3.12 Data-processing (register)
1932 // Two register operands [rotate]: Rs Rm [rotation(= (rotate:'000'))]
1933 // Three register operands only: Rs Rn Rm
1934 // Three register operands [rotate]: Rs Rn Rm [rotation(= (rotate:'000'))]
1936 // Parallel addition and subtraction 32-bit Thumb instructions: Rs Rn Rm
1938 // Miscellaneous operations: Rs [Rn] Rm
1939 static bool DisassembleThumb2DPReg(MCInst &MI, unsigned Opcode, uint32_t insn,
1940 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1942 const TargetInstrDesc &TID = ARMInsts[Opcode];
1943 const TargetOperandInfo *OpInfo = TID.OpInfo;
1944 unsigned &OpIdx = NumOpsAdded;
1948 assert(NumOps >= 2 &&
1949 OpInfo[0].RegClass == ARM::GPRRegClassID &&
1950 OpInfo[1].RegClass == ARM::GPRRegClassID &&
1951 "Expect >= 2 operands and first two as reg operands");
1953 // Build the register operands, followed by the optional rotation amount.
1955 bool ThreeReg = NumOps > 2 && OpInfo[2].RegClass == ARM::GPRRegClassID;
1957 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1962 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1967 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
1971 if (OpIdx < NumOps && OpInfo[OpIdx].RegClass == 0
1972 && !OpInfo[OpIdx].isPredicate() && !OpInfo[OpIdx].isOptionalDef()) {
1973 // Add the rotation amount immediate.
1974 MI.addOperand(MCOperand::CreateImm(decodeRotate(insn)));
1981 // A6.3.16 Multiply, multiply accumulate, and absolute difference
1983 // t2MLA, t2MLS, t2SMMLA, t2SMMLS: Rs Rn Rm Ra=Inst{15-12}
1984 // t2MUL, t2SMMUL: Rs Rn Rm
1985 // t2SMLA[BB|BT|TB|TT|WB|WT]: Rs Rn Rm Ra=Inst{15-12}
1986 // t2SMUL[BB|BT|TB|TT|WB|WT]: Rs Rn Rm
1988 // Dual halfword multiply: t2SMUAD[X], t2SMUSD[X], t2SMLAD[X], t2SMLSD[X]:
1989 // Rs Rn Rm Ra=Inst{15-12}
1991 // Unsigned Sum of Absolute Differences [and Accumulate]
1992 // Rs Rn Rm [Ra=Inst{15-12}]
1993 static bool DisassembleThumb2Mul(MCInst &MI, unsigned Opcode, uint32_t insn,
1994 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
1996 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
1998 assert(NumOps >= 3 &&
1999 OpInfo[0].RegClass == ARM::GPRRegClassID &&
2000 OpInfo[1].RegClass == ARM::GPRRegClassID &&
2001 OpInfo[2].RegClass == ARM::GPRRegClassID &&
2002 "Expect >= 3 operands and first three as reg operands");
2004 // Build the register operands.
2006 bool FourReg = NumOps > 3 && OpInfo[3].RegClass == ARM::GPRRegClassID;
2008 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2011 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2014 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2018 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2021 NumOpsAdded = FourReg ? 4 : 3;
2026 // A6.3.17 Long multiply, long multiply accumulate, and divide
2028 // t2SMULL, t2UMULL, t2SMLAL, t2UMLAL, t2UMAAL: RdLo RdHi Rn Rm
2029 // where RdLo = Inst{15-12} and RdHi = Inst{11-8}
2031 // Halfword multiple accumulate long: t2SMLAL<x><y>: RdLo RdHi Rn Rm
2032 // where RdLo = Inst{15-12} and RdHi = Inst{11-8}
2034 // Dual halfword multiple: t2SMLALD[X], t2SMLSLD[X]: RdLo RdHi Rn Rm
2035 // where RdLo = Inst{15-12} and RdHi = Inst{11-8}
2037 // Signed/Unsigned divide: t2SDIV, t2UDIV: Rs Rn Rm
2038 static bool DisassembleThumb2LongMul(MCInst &MI, unsigned Opcode, uint32_t insn,
2039 unsigned short NumOps, unsigned &NumOpsAdded, BO B) {
2041 const TargetOperandInfo *OpInfo = ARMInsts[Opcode].OpInfo;
2043 assert(NumOps >= 3 &&
2044 OpInfo[0].RegClass == ARM::GPRRegClassID &&
2045 OpInfo[1].RegClass == ARM::GPRRegClassID &&
2046 OpInfo[2].RegClass == ARM::GPRRegClassID &&
2047 "Expect >= 3 operands and first three as reg operands");
2049 bool FourReg = NumOps > 3 && OpInfo[3].RegClass == ARM::GPRRegClassID;
2051 // Build the register operands.
2054 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2057 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2060 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2063 MI.addOperand(MCOperand::CreateReg(getRegisterEnum(B, ARM::GPRRegClassID,
2074 // See A6.3 32-bit Thumb instruction encoding for instruction classes
2075 // corresponding to (op1, op2, op).
2077 // Table A6-9 32-bit Thumb instruction encoding
2078 // op1 op2 op Instruction class, see
2079 // --- ------- -- ------------------------------------------------------------
2080 // 01 00xx0xx - Load/store multiple on page A6-23
2081 // 00xx1xx - Load/store dual, load/store exclusive, table branch on page A6-24
2082 // 01xxxxx - Data-processing (shifted register) on page A6-31
2083 // 1xxxxxx - Coprocessor instructions on page A6-40
2084 // 10 x0xxxxx 0 Data-processing (modified immediate) on page A6-15
2085 // x1xxxxx 0 Data-processing (plain binary immediate) on page A6-19
2086 // - 1 Branches and miscellaneous control on page A6-20
2087 // 11 000xxx0 - Store single data item on page A6-30
2088 // 001xxx0 - Advanced SIMD element or structure load/store instructions on page A7-27
2089 // 00xx001 - Load byte, memory hints on page A6-28
2090 // 00xx011 - Load halfword, memory hints on page A6-26
2091 // 00xx101 - Load word on page A6-25
2092 // 00xx111 - UNDEFINED
2093 // 010xxxx - Data-processing (register) on page A6-33
2094 // 0110xxx - Multiply, multiply accumulate, and absolute difference on page A6-38
2095 // 0111xxx - Long multiply, long multiply accumulate, and divide on page A6-39
2096 // 1xxxxxx - Coprocessor instructions on page A6-40
2098 static bool DisassembleThumb2(uint16_t op1, uint16_t op2, uint16_t op,
2099 MCInst &MI, unsigned Opcode, uint32_t insn, unsigned short NumOps,
2100 unsigned &NumOpsAdded, BO B) {
2104 if (slice(op2, 6, 5) == 0) {
2105 if (slice(op2, 2, 2) == 0) {
2106 // Load/store multiple.
2107 return DisassembleThumb2LdStMul(MI, Opcode, insn, NumOps, NumOpsAdded,
2111 // Load/store dual, load/store exclusive, table branch, otherwise.
2112 assert(slice(op2, 2, 2) == 1 && "Encoding error");
2113 if ((ARM::t2LDREX <= Opcode && Opcode <= ARM::t2LDREXH) ||
2114 (ARM::t2STREX <= Opcode && Opcode <= ARM::t2STREXH)) {
2115 // Load/store exclusive.
2116 return DisassembleThumb2LdStEx(MI, Opcode, insn, NumOps, NumOpsAdded,
2119 if (Opcode == ARM::t2LDRDi8 ||
2120 Opcode == ARM::t2LDRD_PRE || Opcode == ARM::t2LDRD_POST ||
2121 Opcode == ARM::t2STRDi8 ||
2122 Opcode == ARM::t2STRD_PRE || Opcode == ARM::t2STRD_POST) {
2124 return DisassembleThumb2LdStDual(MI, Opcode, insn, NumOps, NumOpsAdded,
2127 if (Opcode == ARM::t2TBBgen || Opcode == ARM::t2TBHgen) {
2129 return DisassembleThumb2TB(MI, Opcode, insn, NumOps, NumOpsAdded, B);
2131 } else if (slice(op2, 6, 5) == 1) {
2132 // Data-processing (shifted register).
2133 return DisassembleThumb2DPSoReg(MI, Opcode, insn, NumOps, NumOpsAdded, B);
2136 // FIXME: A6.3.18 Coprocessor instructions
2137 // But see ThumbDisassembler::getInstruction().
2142 if (slice(op2, 5, 5) == 0) {
2143 // Data-processing (modified immediate)
2144 return DisassembleThumb2DPModImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2147 // Data-processing (plain binary immediate)
2148 return DisassembleThumb2DPBinImm(MI, Opcode, insn, NumOps, NumOpsAdded,
2152 // Branches and miscellaneous control on page A6-20.
2153 return DisassembleThumb2BrMiscCtrl(MI, Opcode, insn, NumOps, NumOpsAdded,
2159 switch (slice(op2, 6, 5)) {
2161 // Load/store instructions...
2162 if (slice(op2, 0, 0) == 0) {
2163 if (slice(op2, 4, 4) == 0) {
2164 // Store single data item on page A6-30
2165 return DisassembleThumb2LdSt(false, MI,Opcode,insn,NumOps,NumOpsAdded,
2168 // FIXME: Advanced SIMD element or structure load/store instructions.
2169 // But see ThumbDisassembler::getInstruction().
2173 // Table A6-9 32-bit Thumb instruction encoding: Load byte|halfword|word
2174 return DisassembleThumb2LdSt(true, MI,Opcode,insn,NumOps,NumOpsAdded, B);
2178 if (slice(op2, 4, 4) == 0) {
2179 // A6.3.12 Data-processing (register)
2180 return DisassembleThumb2DPReg(MI, Opcode, insn, NumOps, NumOpsAdded, B);
2181 } else if (slice(op2, 3, 3) == 0) {
2182 // A6.3.16 Multiply, multiply accumulate, and absolute difference
2183 return DisassembleThumb2Mul(MI, Opcode, insn, NumOps, NumOpsAdded, B);
2185 // A6.3.17 Long multiply, long multiply accumulate, and divide
2186 return DisassembleThumb2LongMul(MI, Opcode, insn, NumOps, NumOpsAdded,
2191 // FIXME: A6.3.18 Coprocessor instructions
2192 // But see ThumbDisassembler::getInstruction().
2199 assert(0 && "Encoding error for Thumb2 instruction!");
2206 static bool DisassembleThumbFrm(MCInst &MI, unsigned Opcode, uint32_t insn,
2207 unsigned short NumOps, unsigned &NumOpsAdded, BO Builder) {
2209 uint16_t HalfWord = slice(insn, 31, 16);
2211 if (HalfWord == 0) {
2212 // A6.2 16-bit Thumb instruction encoding
2214 uint16_t op = slice(insn, 15, 10);
2215 return DisassembleThumb1(op, MI, Opcode, insn, NumOps, NumOpsAdded,
2219 unsigned bits15_11 = slice(HalfWord, 15, 11);
2221 // A6.1 Thumb instruction set encoding
2222 if (!(bits15_11 == 0x1D || bits15_11 == 0x1E || bits15_11 == 0x1F)) {
2223 assert("Bits[15:11] first halfword of Thumb2 instruction is out of range");
2227 // A6.3 32-bit Thumb instruction encoding
2229 uint16_t op1 = slice(HalfWord, 12, 11);
2230 uint16_t op2 = slice(HalfWord, 10, 4);
2231 uint16_t op = slice(insn, 15, 15);
2233 return DisassembleThumb2(op1, op2, op, MI, Opcode, insn, NumOps, NumOpsAdded,