1 //===-- ARM/ARMMCCodeEmitter.cpp - Convert ARM code to machine code -------===//
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 implements the ARMMCCodeEmitter class.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "mccodeemitter"
15 #include "MCTargetDesc/ARMAddressingModes.h"
16 #include "MCTargetDesc/ARMBaseInfo.h"
17 #include "MCTargetDesc/ARMFixupKinds.h"
18 #include "MCTargetDesc/ARMMCExpr.h"
19 #include "MCTargetDesc/ARMMCTargetDesc.h"
20 #include "llvm/MC/MCCodeEmitter.h"
21 #include "llvm/MC/MCExpr.h"
22 #include "llvm/MC/MCInst.h"
23 #include "llvm/MC/MCInstrInfo.h"
24 #include "llvm/MC/MCRegisterInfo.h"
25 #include "llvm/MC/MCSubtargetInfo.h"
26 #include "llvm/ADT/APFloat.h"
27 #include "llvm/ADT/Statistic.h"
28 #include "llvm/Support/raw_ostream.h"
32 STATISTIC(MCNumEmitted, "Number of MC instructions emitted.");
33 STATISTIC(MCNumCPRelocations, "Number of constant pool relocations created.");
36 class ARMMCCodeEmitter : public MCCodeEmitter {
37 ARMMCCodeEmitter(const ARMMCCodeEmitter &); // DO NOT IMPLEMENT
38 void operator=(const ARMMCCodeEmitter &); // DO NOT IMPLEMENT
39 const MCInstrInfo &MCII;
40 const MCSubtargetInfo &STI;
43 ARMMCCodeEmitter(const MCInstrInfo &mcii, const MCSubtargetInfo &sti,
45 : MCII(mcii), STI(sti) {
48 ~ARMMCCodeEmitter() {}
50 bool isThumb() const {
51 // FIXME: Can tablegen auto-generate this?
52 return (STI.getFeatureBits() & ARM::ModeThumb) != 0;
54 bool isThumb2() const {
55 return isThumb() && (STI.getFeatureBits() & ARM::FeatureThumb2) != 0;
57 bool isTargetDarwin() const {
58 Triple TT(STI.getTargetTriple());
59 Triple::OSType OS = TT.getOS();
60 return OS == Triple::Darwin || OS == Triple::MacOSX || OS == Triple::IOS;
63 unsigned getMachineSoImmOpValue(unsigned SoImm) const;
65 // getBinaryCodeForInstr - TableGen'erated function for getting the
66 // binary encoding for an instruction.
67 unsigned getBinaryCodeForInstr(const MCInst &MI,
68 SmallVectorImpl<MCFixup> &Fixups) const;
70 /// getMachineOpValue - Return binary encoding of operand. If the machine
71 /// operand requires relocation, record the relocation and return zero.
72 unsigned getMachineOpValue(const MCInst &MI,const MCOperand &MO,
73 SmallVectorImpl<MCFixup> &Fixups) const;
75 /// getHiLo16ImmOpValue - Return the encoding for the hi / low 16-bit of
76 /// the specified operand. This is used for operands with :lower16: and
77 /// :upper16: prefixes.
78 uint32_t getHiLo16ImmOpValue(const MCInst &MI, unsigned OpIdx,
79 SmallVectorImpl<MCFixup> &Fixups) const;
81 bool EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx,
82 unsigned &Reg, unsigned &Imm,
83 SmallVectorImpl<MCFixup> &Fixups) const;
85 /// getThumbBLTargetOpValue - Return encoding info for Thumb immediate
87 uint32_t getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
88 SmallVectorImpl<MCFixup> &Fixups) const;
90 /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate
91 /// BLX branch target.
92 uint32_t getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
93 SmallVectorImpl<MCFixup> &Fixups) const;
95 /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target.
96 uint32_t getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx,
97 SmallVectorImpl<MCFixup> &Fixups) const;
99 /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target.
100 uint32_t getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx,
101 SmallVectorImpl<MCFixup> &Fixups) const;
103 /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target.
104 uint32_t getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx,
105 SmallVectorImpl<MCFixup> &Fixups) const;
107 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate
109 uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
110 SmallVectorImpl<MCFixup> &Fixups) const;
112 /// getUnconditionalBranchTargetOpValue - Return encoding info for 24-bit
113 /// immediate Thumb2 direct branch target.
114 uint32_t getUnconditionalBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
115 SmallVectorImpl<MCFixup> &Fixups) const;
117 /// getARMBranchTargetOpValue - Return encoding info for 24-bit immediate
119 uint32_t getARMBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
120 SmallVectorImpl<MCFixup> &Fixups) const;
121 uint32_t getARMBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
122 SmallVectorImpl<MCFixup> &Fixups) const;
124 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate
125 /// ADR label target.
126 uint32_t getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
127 SmallVectorImpl<MCFixup> &Fixups) const;
128 uint32_t getThumbAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
129 SmallVectorImpl<MCFixup> &Fixups) const;
130 uint32_t getT2AdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
131 SmallVectorImpl<MCFixup> &Fixups) const;
134 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12'
136 uint32_t getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
137 SmallVectorImpl<MCFixup> &Fixups) const;
139 /// getThumbAddrModeRegRegOpValue - Return encoding for 'reg + reg' operand.
140 uint32_t getThumbAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx,
141 SmallVectorImpl<MCFixup> &Fixups)const;
143 /// getT2AddrModeImm8s4OpValue - Return encoding info for 'reg +/- imm8<<2'
145 uint32_t getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
146 SmallVectorImpl<MCFixup> &Fixups) const;
148 /// getT2AddrModeImm0_1020s4OpValue - Return encoding info for 'reg + imm8<<2'
150 uint32_t getT2AddrModeImm0_1020s4OpValue(const MCInst &MI, unsigned OpIdx,
151 SmallVectorImpl<MCFixup> &Fixups) const;
153 /// getT2Imm8s4OpValue - Return encoding info for '+/- imm8<<2'
155 uint32_t getT2Imm8s4OpValue(const MCInst &MI, unsigned OpIdx,
156 SmallVectorImpl<MCFixup> &Fixups) const;
159 /// getLdStSORegOpValue - Return encoding info for 'reg +/- reg shop imm'
160 /// operand as needed by load/store instructions.
161 uint32_t getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
162 SmallVectorImpl<MCFixup> &Fixups) const;
164 /// getLdStmModeOpValue - Return encoding for load/store multiple mode.
165 uint32_t getLdStmModeOpValue(const MCInst &MI, unsigned OpIdx,
166 SmallVectorImpl<MCFixup> &Fixups) const {
167 ARM_AM::AMSubMode Mode = (ARM_AM::AMSubMode)MI.getOperand(OpIdx).getImm();
169 default: assert(0 && "Unknown addressing sub-mode!");
170 case ARM_AM::da: return 0;
171 case ARM_AM::ia: return 1;
172 case ARM_AM::db: return 2;
173 case ARM_AM::ib: return 3;
176 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
178 unsigned getShiftOp(ARM_AM::ShiftOpc ShOpc) const {
180 case ARM_AM::no_shift:
181 case ARM_AM::lsl: return 0;
182 case ARM_AM::lsr: return 1;
183 case ARM_AM::asr: return 2;
185 case ARM_AM::rrx: return 3;
190 /// getAddrMode2OpValue - Return encoding for addrmode2 operands.
191 uint32_t getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
192 SmallVectorImpl<MCFixup> &Fixups) const;
194 /// getAddrMode2OffsetOpValue - Return encoding for am2offset operands.
195 uint32_t getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
196 SmallVectorImpl<MCFixup> &Fixups) const;
198 /// getPostIdxRegOpValue - Return encoding for postidx_reg operands.
199 uint32_t getPostIdxRegOpValue(const MCInst &MI, unsigned OpIdx,
200 SmallVectorImpl<MCFixup> &Fixups) const;
202 /// getAddrMode3OffsetOpValue - Return encoding for am3offset operands.
203 uint32_t getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
204 SmallVectorImpl<MCFixup> &Fixups) const;
206 /// getAddrMode3OpValue - Return encoding for addrmode3 operands.
207 uint32_t getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
208 SmallVectorImpl<MCFixup> &Fixups) const;
210 /// getAddrModeThumbSPOpValue - Return encoding info for 'reg +/- imm12'
212 uint32_t getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx,
213 SmallVectorImpl<MCFixup> &Fixups) const;
215 /// getAddrModeISOpValue - Encode the t_addrmode_is# operands.
216 uint32_t getAddrModeISOpValue(const MCInst &MI, unsigned OpIdx,
217 SmallVectorImpl<MCFixup> &Fixups) const;
219 /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands.
220 uint32_t getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx,
221 SmallVectorImpl<MCFixup> &Fixups) const;
223 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm8' operand.
224 uint32_t getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
225 SmallVectorImpl<MCFixup> &Fixups) const;
227 /// getCCOutOpValue - Return encoding of the 's' bit.
228 unsigned getCCOutOpValue(const MCInst &MI, unsigned Op,
229 SmallVectorImpl<MCFixup> &Fixups) const {
230 // The operand is either reg0 or CPSR. The 's' bit is encoded as '0' or
232 return MI.getOperand(Op).getReg() == ARM::CPSR;
235 /// getSOImmOpValue - Return an encoded 12-bit shifted-immediate value.
236 unsigned getSOImmOpValue(const MCInst &MI, unsigned Op,
237 SmallVectorImpl<MCFixup> &Fixups) const {
238 unsigned SoImm = MI.getOperand(Op).getImm();
239 int SoImmVal = ARM_AM::getSOImmVal(SoImm);
240 assert(SoImmVal != -1 && "Not a valid so_imm value!");
242 // Encode rotate_imm.
243 unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1)
244 << ARMII::SoRotImmShift;
247 Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal);
251 /// getT2SOImmOpValue - Return an encoded 12-bit shifted-immediate value.
252 unsigned getT2SOImmOpValue(const MCInst &MI, unsigned Op,
253 SmallVectorImpl<MCFixup> &Fixups) const {
254 unsigned SoImm = MI.getOperand(Op).getImm();
255 unsigned Encoded = ARM_AM::getT2SOImmVal(SoImm);
256 assert(Encoded != ~0U && "Not a Thumb2 so_imm value?");
260 unsigned getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
261 SmallVectorImpl<MCFixup> &Fixups) const;
262 unsigned getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
263 SmallVectorImpl<MCFixup> &Fixups) const;
264 unsigned getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
265 SmallVectorImpl<MCFixup> &Fixups) const;
266 unsigned getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
267 SmallVectorImpl<MCFixup> &Fixups) const;
269 /// getSORegOpValue - Return an encoded so_reg shifted register value.
270 unsigned getSORegRegOpValue(const MCInst &MI, unsigned Op,
271 SmallVectorImpl<MCFixup> &Fixups) const;
272 unsigned getSORegImmOpValue(const MCInst &MI, unsigned Op,
273 SmallVectorImpl<MCFixup> &Fixups) const;
274 unsigned getT2SORegOpValue(const MCInst &MI, unsigned Op,
275 SmallVectorImpl<MCFixup> &Fixups) const;
277 unsigned getNEONVcvtImm32OpValue(const MCInst &MI, unsigned Op,
278 SmallVectorImpl<MCFixup> &Fixups) const {
279 return 64 - MI.getOperand(Op).getImm();
282 unsigned getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
283 SmallVectorImpl<MCFixup> &Fixups) const;
285 unsigned getRegisterListOpValue(const MCInst &MI, unsigned Op,
286 SmallVectorImpl<MCFixup> &Fixups) const;
287 unsigned getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
288 SmallVectorImpl<MCFixup> &Fixups) const;
289 unsigned getAddrMode6OneLane32AddressOpValue(const MCInst &MI, unsigned Op,
290 SmallVectorImpl<MCFixup> &Fixups) const;
291 unsigned getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
292 SmallVectorImpl<MCFixup> &Fixups) const;
293 unsigned getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
294 SmallVectorImpl<MCFixup> &Fixups) const;
296 unsigned getShiftRight8Imm(const MCInst &MI, unsigned Op,
297 SmallVectorImpl<MCFixup> &Fixups) const;
298 unsigned getShiftRight16Imm(const MCInst &MI, unsigned Op,
299 SmallVectorImpl<MCFixup> &Fixups) const;
300 unsigned getShiftRight32Imm(const MCInst &MI, unsigned Op,
301 SmallVectorImpl<MCFixup> &Fixups) const;
302 unsigned getShiftRight64Imm(const MCInst &MI, unsigned Op,
303 SmallVectorImpl<MCFixup> &Fixups) const;
305 unsigned getThumbSRImmOpValue(const MCInst &MI, unsigned Op,
306 SmallVectorImpl<MCFixup> &Fixups) const;
308 unsigned NEONThumb2DataIPostEncoder(const MCInst &MI,
309 unsigned EncodedValue) const;
310 unsigned NEONThumb2LoadStorePostEncoder(const MCInst &MI,
311 unsigned EncodedValue) const;
312 unsigned NEONThumb2DupPostEncoder(const MCInst &MI,
313 unsigned EncodedValue) const;
315 unsigned VFPThumb2PostEncoder(const MCInst &MI,
316 unsigned EncodedValue) const;
318 void EmitByte(unsigned char C, raw_ostream &OS) const {
322 void EmitConstant(uint64_t Val, unsigned Size, raw_ostream &OS) const {
323 // Output the constant in little endian byte order.
324 for (unsigned i = 0; i != Size; ++i) {
325 EmitByte(Val & 255, OS);
330 void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
331 SmallVectorImpl<MCFixup> &Fixups) const;
334 } // end anonymous namespace
336 MCCodeEmitter *llvm::createARMMCCodeEmitter(const MCInstrInfo &MCII,
337 const MCSubtargetInfo &STI,
339 return new ARMMCCodeEmitter(MCII, STI, Ctx);
342 /// NEONThumb2DataIPostEncoder - Post-process encoded NEON data-processing
343 /// instructions, and rewrite them to their Thumb2 form if we are currently in
345 unsigned ARMMCCodeEmitter::NEONThumb2DataIPostEncoder(const MCInst &MI,
346 unsigned EncodedValue) const {
348 // NEON Thumb2 data-processsing encodings are very simple: bit 24 is moved
349 // to bit 12 of the high half-word (i.e. bit 28), and bits 27-24 are
351 unsigned Bit24 = EncodedValue & 0x01000000;
352 unsigned Bit28 = Bit24 << 4;
353 EncodedValue &= 0xEFFFFFFF;
354 EncodedValue |= Bit28;
355 EncodedValue |= 0x0F000000;
361 /// NEONThumb2LoadStorePostEncoder - Post-process encoded NEON load/store
362 /// instructions, and rewrite them to their Thumb2 form if we are currently in
364 unsigned ARMMCCodeEmitter::NEONThumb2LoadStorePostEncoder(const MCInst &MI,
365 unsigned EncodedValue) const {
367 EncodedValue &= 0xF0FFFFFF;
368 EncodedValue |= 0x09000000;
374 /// NEONThumb2DupPostEncoder - Post-process encoded NEON vdup
375 /// instructions, and rewrite them to their Thumb2 form if we are currently in
377 unsigned ARMMCCodeEmitter::NEONThumb2DupPostEncoder(const MCInst &MI,
378 unsigned EncodedValue) const {
380 EncodedValue &= 0x00FFFFFF;
381 EncodedValue |= 0xEE000000;
387 /// VFPThumb2PostEncoder - Post-process encoded VFP instructions and rewrite
388 /// them to their Thumb2 form if we are currently in Thumb2 mode.
389 unsigned ARMMCCodeEmitter::
390 VFPThumb2PostEncoder(const MCInst &MI, unsigned EncodedValue) const {
392 EncodedValue &= 0x0FFFFFFF;
393 EncodedValue |= 0xE0000000;
398 /// getMachineOpValue - Return binary encoding of operand. If the machine
399 /// operand requires relocation, record the relocation and return zero.
400 unsigned ARMMCCodeEmitter::
401 getMachineOpValue(const MCInst &MI, const MCOperand &MO,
402 SmallVectorImpl<MCFixup> &Fixups) const {
404 unsigned Reg = MO.getReg();
405 unsigned RegNo = getARMRegisterNumbering(Reg);
407 // Q registers are encoded as 2x their register number.
411 case ARM::Q0: case ARM::Q1: case ARM::Q2: case ARM::Q3:
412 case ARM::Q4: case ARM::Q5: case ARM::Q6: case ARM::Q7:
413 case ARM::Q8: case ARM::Q9: case ARM::Q10: case ARM::Q11:
414 case ARM::Q12: case ARM::Q13: case ARM::Q14: case ARM::Q15:
417 } else if (MO.isImm()) {
418 return static_cast<unsigned>(MO.getImm());
419 } else if (MO.isFPImm()) {
420 return static_cast<unsigned>(APFloat(MO.getFPImm())
421 .bitcastToAPInt().getHiBits(32).getLimitedValue());
424 llvm_unreachable("Unable to encode MCOperand!");
428 /// getAddrModeImmOpValue - Return encoding info for 'reg +/- imm' operand.
429 bool ARMMCCodeEmitter::
430 EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx, unsigned &Reg,
431 unsigned &Imm, SmallVectorImpl<MCFixup> &Fixups) const {
432 const MCOperand &MO = MI.getOperand(OpIdx);
433 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
435 Reg = getARMRegisterNumbering(MO.getReg());
437 int32_t SImm = MO1.getImm();
440 // Special value for #-0
441 if (SImm == INT32_MIN) {
446 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
456 /// getBranchTargetOpValue - Helper function to get the branch target operand,
457 /// which is either an immediate or requires a fixup.
458 static uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
460 SmallVectorImpl<MCFixup> &Fixups) {
461 const MCOperand &MO = MI.getOperand(OpIdx);
463 // If the destination is an immediate, we have nothing to do.
464 if (MO.isImm()) return MO.getImm();
465 assert(MO.isExpr() && "Unexpected branch target type!");
466 const MCExpr *Expr = MO.getExpr();
467 MCFixupKind Kind = MCFixupKind(FixupKind);
468 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
470 // All of the information is in the fixup.
474 // Thumb BL and BLX use a strange offset encoding where bits 22 and 21 are
475 // determined by negating them and XOR'ing them with bit 23.
476 static int32_t encodeThumbBLOffset(int32_t offset) {
478 uint32_t S = (offset & 0x800000) >> 23;
479 uint32_t J1 = (offset & 0x400000) >> 22;
480 uint32_t J2 = (offset & 0x200000) >> 21;
493 /// getThumbBLTargetOpValue - Return encoding info for immediate branch target.
494 uint32_t ARMMCCodeEmitter::
495 getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
496 SmallVectorImpl<MCFixup> &Fixups) const {
497 const MCOperand MO = MI.getOperand(OpIdx);
499 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bl,
501 return encodeThumbBLOffset(MO.getImm());
504 /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate
505 /// BLX branch target.
506 uint32_t ARMMCCodeEmitter::
507 getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
508 SmallVectorImpl<MCFixup> &Fixups) const {
509 const MCOperand MO = MI.getOperand(OpIdx);
511 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_blx,
513 return encodeThumbBLOffset(MO.getImm());
516 /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target.
517 uint32_t ARMMCCodeEmitter::
518 getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx,
519 SmallVectorImpl<MCFixup> &Fixups) const {
520 const MCOperand MO = MI.getOperand(OpIdx);
522 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_br,
524 return (MO.getImm() >> 1);
527 /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target.
528 uint32_t ARMMCCodeEmitter::
529 getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx,
530 SmallVectorImpl<MCFixup> &Fixups) const {
531 const MCOperand MO = MI.getOperand(OpIdx);
533 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bcc,
535 return (MO.getImm() >> 1);
538 /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target.
539 uint32_t ARMMCCodeEmitter::
540 getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx,
541 SmallVectorImpl<MCFixup> &Fixups) const {
542 const MCOperand MO = MI.getOperand(OpIdx);
544 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cb, Fixups);
545 return (MO.getImm() >> 1);
548 /// Return true if this branch has a non-always predication
549 static bool HasConditionalBranch(const MCInst &MI) {
550 int NumOp = MI.getNumOperands();
552 for (int i = 0; i < NumOp-1; ++i) {
553 const MCOperand &MCOp1 = MI.getOperand(i);
554 const MCOperand &MCOp2 = MI.getOperand(i + 1);
555 if (MCOp1.isImm() && MCOp2.isReg() &&
556 (MCOp2.getReg() == 0 || MCOp2.getReg() == ARM::CPSR)) {
557 if (ARMCC::CondCodes(MCOp1.getImm()) != ARMCC::AL)
565 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch
567 uint32_t ARMMCCodeEmitter::
568 getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
569 SmallVectorImpl<MCFixup> &Fixups) const {
570 // FIXME: This really, really shouldn't use TargetMachine. We don't want
571 // coupling between MC and TM anywhere we can help it.
574 ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_condbranch, Fixups);
575 return getARMBranchTargetOpValue(MI, OpIdx, Fixups);
578 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch
580 uint32_t ARMMCCodeEmitter::
581 getARMBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
582 SmallVectorImpl<MCFixup> &Fixups) const {
583 const MCOperand MO = MI.getOperand(OpIdx);
585 if (HasConditionalBranch(MI))
586 return ::getBranchTargetOpValue(MI, OpIdx,
587 ARM::fixup_arm_condbranch, Fixups);
588 return ::getBranchTargetOpValue(MI, OpIdx,
589 ARM::fixup_arm_uncondbranch, Fixups);
592 return MO.getImm() >> 2;
595 uint32_t ARMMCCodeEmitter::
596 getARMBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
597 SmallVectorImpl<MCFixup> &Fixups) const {
598 const MCOperand MO = MI.getOperand(OpIdx);
600 if (HasConditionalBranch(MI))
601 return ::getBranchTargetOpValue(MI, OpIdx,
602 ARM::fixup_arm_condbranch, Fixups);
603 return ::getBranchTargetOpValue(MI, OpIdx,
604 ARM::fixup_arm_uncondbranch, Fixups);
607 return MO.getImm() >> 1;
610 /// getUnconditionalBranchTargetOpValue - Return encoding info for 24-bit
611 /// immediate branch target.
612 uint32_t ARMMCCodeEmitter::
613 getUnconditionalBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
614 SmallVectorImpl<MCFixup> &Fixups) const {
616 ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_uncondbranch, Fixups);
617 bool I = (Val & 0x800000);
618 bool J1 = (Val & 0x400000);
619 bool J2 = (Val & 0x200000);
633 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate ADR label
635 uint32_t ARMMCCodeEmitter::
636 getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
637 SmallVectorImpl<MCFixup> &Fixups) const {
638 const MCOperand MO = MI.getOperand(OpIdx);
640 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_adr_pcrel_12,
642 int32_t offset = MO.getImm();
643 uint32_t Val = 0x2000;
652 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate ADR label
654 uint32_t ARMMCCodeEmitter::
655 getT2AdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
656 SmallVectorImpl<MCFixup> &Fixups) const {
657 const MCOperand MO = MI.getOperand(OpIdx);
659 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_adr_pcrel_12,
661 int32_t Val = MO.getImm();
669 /// getAdrLabelOpValue - Return encoding info for 8-bit immediate ADR label
671 uint32_t ARMMCCodeEmitter::
672 getThumbAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
673 SmallVectorImpl<MCFixup> &Fixups) const {
674 const MCOperand MO = MI.getOperand(OpIdx);
676 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_thumb_adr_pcrel_10,
681 /// getThumbAddrModeRegRegOpValue - Return encoding info for 'reg + reg'
683 uint32_t ARMMCCodeEmitter::
684 getThumbAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx,
685 SmallVectorImpl<MCFixup> &) const {
689 const MCOperand &MO1 = MI.getOperand(OpIdx);
690 const MCOperand &MO2 = MI.getOperand(OpIdx + 1);
691 unsigned Rn = getARMRegisterNumbering(MO1.getReg());
692 unsigned Rm = getARMRegisterNumbering(MO2.getReg());
693 return (Rm << 3) | Rn;
696 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12' operand.
697 uint32_t ARMMCCodeEmitter::
698 getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
699 SmallVectorImpl<MCFixup> &Fixups) const {
701 // {12} = (U)nsigned (add == '1', sub == '0')
705 // If The first operand isn't a register, we have a label reference.
706 const MCOperand &MO = MI.getOperand(OpIdx);
708 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
710 isAdd = false ; // 'U' bit is set as part of the fixup.
713 const MCExpr *Expr = MO.getExpr();
717 Kind = MCFixupKind(ARM::fixup_t2_ldst_pcrel_12);
719 Kind = MCFixupKind(ARM::fixup_arm_ldst_pcrel_12);
720 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
722 ++MCNumCPRelocations;
725 int32_t Offset = MO.getImm();
726 // FIXME: Handle #-0.
734 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm12, Fixups);
736 uint32_t Binary = Imm12 & 0xfff;
737 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
740 Binary |= (Reg << 13);
744 /// getT2Imm8s4OpValue - Return encoding info for
745 /// '+/- imm8<<2' operand.
746 uint32_t ARMMCCodeEmitter::
747 getT2Imm8s4OpValue(const MCInst &MI, unsigned OpIdx,
748 SmallVectorImpl<MCFixup> &Fixups) const {
749 // FIXME: The immediate operand should have already been encoded like this
750 // before ever getting here. The encoder method should just need to combine
751 // the MI operands for the register and the offset into a single
752 // representation for the complex operand in the .td file. This isn't just
753 // style, unfortunately. As-is, we can't represent the distinct encoding
756 // {8} = (U)nsigned (add == '1', sub == '0')
758 int32_t Imm8 = MI.getOperand(OpIdx).getImm();
759 bool isAdd = Imm8 >= 0;
761 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
768 uint32_t Binary = Imm8 & 0xff;
769 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
775 /// getT2AddrModeImm8s4OpValue - Return encoding info for
776 /// 'reg +/- imm8<<2' operand.
777 uint32_t ARMMCCodeEmitter::
778 getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
779 SmallVectorImpl<MCFixup> &Fixups) const {
781 // {8} = (U)nsigned (add == '1', sub == '0')
785 // If The first operand isn't a register, we have a label reference.
786 const MCOperand &MO = MI.getOperand(OpIdx);
788 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
790 isAdd = false ; // 'U' bit is set as part of the fixup.
792 assert(MO.isExpr() && "Unexpected machine operand type!");
793 const MCExpr *Expr = MO.getExpr();
794 MCFixupKind Kind = MCFixupKind(ARM::fixup_t2_pcrel_10);
795 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
797 ++MCNumCPRelocations;
799 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups);
801 // FIXME: The immediate operand should have already been encoded like this
802 // before ever getting here. The encoder method should just need to combine
803 // the MI operands for the register and the offset into a single
804 // representation for the complex operand in the .td file. This isn't just
805 // style, unfortunately. As-is, we can't represent the distinct encoding
807 uint32_t Binary = (Imm8 >> 2) & 0xff;
808 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
811 Binary |= (Reg << 9);
815 /// getT2AddrModeImm0_1020s4OpValue - Return encoding info for
816 /// 'reg + imm8<<2' operand.
817 uint32_t ARMMCCodeEmitter::
818 getT2AddrModeImm0_1020s4OpValue(const MCInst &MI, unsigned OpIdx,
819 SmallVectorImpl<MCFixup> &Fixups) const {
822 const MCOperand &MO = MI.getOperand(OpIdx);
823 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
824 unsigned Reg = getARMRegisterNumbering(MO.getReg());
825 unsigned Imm8 = MO1.getImm();
826 return (Reg << 8) | Imm8;
829 // FIXME: This routine assumes that a binary
830 // expression will always result in a PCRel expression
831 // In reality, its only true if one or more subexpressions
832 // is itself a PCRel (i.e. "." in asm or some other pcrel construct)
833 // but this is good enough for now.
834 static bool EvaluateAsPCRel(const MCExpr *Expr) {
835 switch (Expr->getKind()) {
836 default: assert(0 && "Unexpected expression type");
837 case MCExpr::SymbolRef: return false;
838 case MCExpr::Binary: return true;
843 ARMMCCodeEmitter::getHiLo16ImmOpValue(const MCInst &MI, unsigned OpIdx,
844 SmallVectorImpl<MCFixup> &Fixups) const {
845 // {20-16} = imm{15-12}
846 // {11-0} = imm{11-0}
847 const MCOperand &MO = MI.getOperand(OpIdx);
849 // Hi / lo 16 bits already extracted during earlier passes.
850 return static_cast<unsigned>(MO.getImm());
852 // Handle :upper16: and :lower16: assembly prefixes.
853 const MCExpr *E = MO.getExpr();
854 if (E->getKind() == MCExpr::Target) {
855 const ARMMCExpr *ARM16Expr = cast<ARMMCExpr>(E);
856 E = ARM16Expr->getSubExpr();
859 switch (ARM16Expr->getKind()) {
860 default: assert(0 && "Unsupported ARMFixup");
861 case ARMMCExpr::VK_ARM_HI16:
862 if (!isTargetDarwin() && EvaluateAsPCRel(E))
863 Kind = MCFixupKind(isThumb2()
864 ? ARM::fixup_t2_movt_hi16_pcrel
865 : ARM::fixup_arm_movt_hi16_pcrel);
867 Kind = MCFixupKind(isThumb2()
868 ? ARM::fixup_t2_movt_hi16
869 : ARM::fixup_arm_movt_hi16);
871 case ARMMCExpr::VK_ARM_LO16:
872 if (!isTargetDarwin() && EvaluateAsPCRel(E))
873 Kind = MCFixupKind(isThumb2()
874 ? ARM::fixup_t2_movw_lo16_pcrel
875 : ARM::fixup_arm_movw_lo16_pcrel);
877 Kind = MCFixupKind(isThumb2()
878 ? ARM::fixup_t2_movw_lo16
879 : ARM::fixup_arm_movw_lo16);
882 Fixups.push_back(MCFixup::Create(0, E, Kind));
886 llvm_unreachable("Unsupported MCExpr type in MCOperand!");
890 uint32_t ARMMCCodeEmitter::
891 getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
892 SmallVectorImpl<MCFixup> &Fixups) const {
893 const MCOperand &MO = MI.getOperand(OpIdx);
894 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
895 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
896 unsigned Rn = getARMRegisterNumbering(MO.getReg());
897 unsigned Rm = getARMRegisterNumbering(MO1.getReg());
898 unsigned ShImm = ARM_AM::getAM2Offset(MO2.getImm());
899 bool isAdd = ARM_AM::getAM2Op(MO2.getImm()) == ARM_AM::add;
900 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(MO2.getImm());
901 unsigned SBits = getShiftOp(ShOp);
910 uint32_t Binary = Rm;
912 Binary |= SBits << 5;
913 Binary |= ShImm << 7;
919 uint32_t ARMMCCodeEmitter::
920 getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
921 SmallVectorImpl<MCFixup> &Fixups) const {
923 // {13} 1 == imm12, 0 == Rm
926 const MCOperand &MO = MI.getOperand(OpIdx);
927 unsigned Rn = getARMRegisterNumbering(MO.getReg());
928 uint32_t Binary = getAddrMode2OffsetOpValue(MI, OpIdx + 1, Fixups);
933 uint32_t ARMMCCodeEmitter::
934 getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
935 SmallVectorImpl<MCFixup> &Fixups) const {
936 // {13} 1 == imm12, 0 == Rm
939 const MCOperand &MO = MI.getOperand(OpIdx);
940 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
941 unsigned Imm = MO1.getImm();
942 bool isAdd = ARM_AM::getAM2Op(Imm) == ARM_AM::add;
943 bool isReg = MO.getReg() != 0;
944 uint32_t Binary = ARM_AM::getAM2Offset(Imm);
945 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm12
947 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(Imm);
948 Binary <<= 7; // Shift amount is bits [11:7]
949 Binary |= getShiftOp(ShOp) << 5; // Shift type is bits [6:5]
950 Binary |= getARMRegisterNumbering(MO.getReg()); // Rm is bits [3:0]
952 return Binary | (isAdd << 12) | (isReg << 13);
955 uint32_t ARMMCCodeEmitter::
956 getPostIdxRegOpValue(const MCInst &MI, unsigned OpIdx,
957 SmallVectorImpl<MCFixup> &Fixups) const {
960 const MCOperand &MO = MI.getOperand(OpIdx);
961 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
962 bool isAdd = MO1.getImm() != 0;
963 return getARMRegisterNumbering(MO.getReg()) | (isAdd << 4);
966 uint32_t ARMMCCodeEmitter::
967 getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
968 SmallVectorImpl<MCFixup> &Fixups) const {
969 // {9} 1 == imm8, 0 == Rm
973 const MCOperand &MO = MI.getOperand(OpIdx);
974 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
975 unsigned Imm = MO1.getImm();
976 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
977 bool isImm = MO.getReg() == 0;
978 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
979 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
981 Imm8 = getARMRegisterNumbering(MO.getReg());
982 return Imm8 | (isAdd << 8) | (isImm << 9);
985 uint32_t ARMMCCodeEmitter::
986 getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
987 SmallVectorImpl<MCFixup> &Fixups) const {
988 // {13} 1 == imm8, 0 == Rm
993 const MCOperand &MO = MI.getOperand(OpIdx);
994 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
995 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
997 // If The first operand isn't a register, we have a label reference.
999 unsigned Rn = getARMRegisterNumbering(ARM::PC); // Rn is PC.
1001 assert(MO.isExpr() && "Unexpected machine operand type!");
1002 const MCExpr *Expr = MO.getExpr();
1003 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_10_unscaled);
1004 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
1006 ++MCNumCPRelocations;
1007 return (Rn << 9) | (1 << 13);
1009 unsigned Rn = getARMRegisterNumbering(MO.getReg());
1010 unsigned Imm = MO2.getImm();
1011 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
1012 bool isImm = MO1.getReg() == 0;
1013 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
1014 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
1016 Imm8 = getARMRegisterNumbering(MO1.getReg());
1017 return (Rn << 9) | Imm8 | (isAdd << 8) | (isImm << 13);
1020 /// getAddrModeThumbSPOpValue - Encode the t_addrmode_sp operands.
1021 uint32_t ARMMCCodeEmitter::
1022 getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx,
1023 SmallVectorImpl<MCFixup> &Fixups) const {
1026 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1027 assert(MI.getOperand(OpIdx).getReg() == ARM::SP &&
1028 "Unexpected base register!");
1030 // The immediate is already shifted for the implicit zeroes, so no change
1032 return MO1.getImm() & 0xff;
1035 /// getAddrModeISOpValue - Encode the t_addrmode_is# operands.
1036 uint32_t ARMMCCodeEmitter::
1037 getAddrModeISOpValue(const MCInst &MI, unsigned OpIdx,
1038 SmallVectorImpl<MCFixup> &Fixups) const {
1042 const MCOperand &MO = MI.getOperand(OpIdx);
1043 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1044 unsigned Rn = getARMRegisterNumbering(MO.getReg());
1045 unsigned Imm5 = MO1.getImm();
1046 return ((Imm5 & 0x1f) << 3) | Rn;
1049 /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands.
1050 uint32_t ARMMCCodeEmitter::
1051 getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx,
1052 SmallVectorImpl<MCFixup> &Fixups) const {
1053 const MCOperand MO = MI.getOperand(OpIdx);
1055 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cp, Fixups);
1056 return (MO.getImm() >> 2);
1059 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm10' operand.
1060 uint32_t ARMMCCodeEmitter::
1061 getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
1062 SmallVectorImpl<MCFixup> &Fixups) const {
1064 // {8} = (U)nsigned (add == '1', sub == '0')
1068 // If The first operand isn't a register, we have a label reference.
1069 const MCOperand &MO = MI.getOperand(OpIdx);
1071 Reg = getARMRegisterNumbering(ARM::PC); // Rn is PC.
1073 isAdd = false; // 'U' bit is handled as part of the fixup.
1075 assert(MO.isExpr() && "Unexpected machine operand type!");
1076 const MCExpr *Expr = MO.getExpr();
1079 Kind = MCFixupKind(ARM::fixup_t2_pcrel_10);
1081 Kind = MCFixupKind(ARM::fixup_arm_pcrel_10);
1082 Fixups.push_back(MCFixup::Create(0, Expr, Kind));
1084 ++MCNumCPRelocations;
1086 EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups);
1087 isAdd = ARM_AM::getAM5Op(Imm8) == ARM_AM::add;
1090 uint32_t Binary = ARM_AM::getAM5Offset(Imm8);
1091 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
1094 Binary |= (Reg << 9);
1098 unsigned ARMMCCodeEmitter::
1099 getSORegRegOpValue(const MCInst &MI, unsigned OpIdx,
1100 SmallVectorImpl<MCFixup> &Fixups) const {
1101 // Sub-operands are [reg, reg, imm]. The first register is Rm, the reg to be
1102 // shifted. The second is Rs, the amount to shift by, and the third specifies
1103 // the type of the shift.
1111 const MCOperand &MO = MI.getOperand(OpIdx);
1112 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1113 const MCOperand &MO2 = MI.getOperand(OpIdx + 2);
1114 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
1117 unsigned Binary = getARMRegisterNumbering(MO.getReg());
1119 // Encode the shift opcode.
1121 unsigned Rs = MO1.getReg();
1123 // Set shift operand (bit[7:4]).
1129 default: llvm_unreachable("Unknown shift opc!");
1130 case ARM_AM::lsl: SBits = 0x1; break;
1131 case ARM_AM::lsr: SBits = 0x3; break;
1132 case ARM_AM::asr: SBits = 0x5; break;
1133 case ARM_AM::ror: SBits = 0x7; break;
1137 Binary |= SBits << 4;
1139 // Encode the shift operation Rs.
1140 // Encode Rs bit[11:8].
1141 assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
1142 return Binary | (getARMRegisterNumbering(Rs) << ARMII::RegRsShift);
1145 unsigned ARMMCCodeEmitter::
1146 getSORegImmOpValue(const MCInst &MI, unsigned OpIdx,
1147 SmallVectorImpl<MCFixup> &Fixups) const {
1148 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
1149 // shifted. The second is the amount to shift by.
1156 const MCOperand &MO = MI.getOperand(OpIdx);
1157 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1158 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm());
1161 unsigned Binary = getARMRegisterNumbering(MO.getReg());
1163 // Encode the shift opcode.
1166 // Set shift operand (bit[6:4]).
1171 // RRX - 110 and bit[11:8] clear.
1173 default: llvm_unreachable("Unknown shift opc!");
1174 case ARM_AM::lsl: SBits = 0x0; break;
1175 case ARM_AM::lsr: SBits = 0x2; break;
1176 case ARM_AM::asr: SBits = 0x4; break;
1177 case ARM_AM::ror: SBits = 0x6; break;
1183 // Encode shift_imm bit[11:7].
1184 Binary |= SBits << 4;
1185 unsigned Offset = ARM_AM::getSORegOffset(MO1.getImm());
1186 assert(Offset && "Offset must be in range 1-32!");
1187 if (Offset == 32) Offset = 0;
1188 return Binary | (Offset << 7);
1192 unsigned ARMMCCodeEmitter::
1193 getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
1194 SmallVectorImpl<MCFixup> &Fixups) const {
1195 const MCOperand &MO1 = MI.getOperand(OpNum);
1196 const MCOperand &MO2 = MI.getOperand(OpNum+1);
1197 const MCOperand &MO3 = MI.getOperand(OpNum+2);
1199 // Encoded as [Rn, Rm, imm].
1200 // FIXME: Needs fixup support.
1201 unsigned Value = getARMRegisterNumbering(MO1.getReg());
1203 Value |= getARMRegisterNumbering(MO2.getReg());
1205 Value |= MO3.getImm();
1210 unsigned ARMMCCodeEmitter::
1211 getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
1212 SmallVectorImpl<MCFixup> &Fixups) const {
1213 const MCOperand &MO1 = MI.getOperand(OpNum);
1214 const MCOperand &MO2 = MI.getOperand(OpNum+1);
1216 // FIXME: Needs fixup support.
1217 unsigned Value = getARMRegisterNumbering(MO1.getReg());
1219 // Even though the immediate is 8 bits long, we need 9 bits in order
1220 // to represent the (inverse of the) sign bit.
1222 int32_t tmp = (int32_t)MO2.getImm();
1226 Value |= 256; // Set the ADD bit
1231 unsigned ARMMCCodeEmitter::
1232 getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
1233 SmallVectorImpl<MCFixup> &Fixups) const {
1234 const MCOperand &MO1 = MI.getOperand(OpNum);
1236 // FIXME: Needs fixup support.
1238 int32_t tmp = (int32_t)MO1.getImm();
1242 Value |= 256; // Set the ADD bit
1247 unsigned ARMMCCodeEmitter::
1248 getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
1249 SmallVectorImpl<MCFixup> &Fixups) const {
1250 const MCOperand &MO1 = MI.getOperand(OpNum);
1252 // FIXME: Needs fixup support.
1254 int32_t tmp = (int32_t)MO1.getImm();
1258 Value |= 4096; // Set the ADD bit
1259 Value |= tmp & 4095;
1263 unsigned ARMMCCodeEmitter::
1264 getT2SORegOpValue(const MCInst &MI, unsigned OpIdx,
1265 SmallVectorImpl<MCFixup> &Fixups) const {
1266 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
1267 // shifted. The second is the amount to shift by.
1274 const MCOperand &MO = MI.getOperand(OpIdx);
1275 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1276 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm());
1279 unsigned Binary = getARMRegisterNumbering(MO.getReg());
1281 // Encode the shift opcode.
1283 // Set shift operand (bit[6:4]).
1289 default: llvm_unreachable("Unknown shift opc!");
1290 case ARM_AM::lsl: SBits = 0x0; break;
1291 case ARM_AM::lsr: SBits = 0x2; break;
1292 case ARM_AM::asr: SBits = 0x4; break;
1293 case ARM_AM::rrx: // FALLTHROUGH
1294 case ARM_AM::ror: SBits = 0x6; break;
1297 Binary |= SBits << 4;
1298 if (SOpc == ARM_AM::rrx)
1301 // Encode shift_imm bit[11:7].
1302 return Binary | ARM_AM::getSORegOffset(MO1.getImm()) << 7;
1305 unsigned ARMMCCodeEmitter::
1306 getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
1307 SmallVectorImpl<MCFixup> &Fixups) const {
1308 // 10 bits. lower 5 bits are are the lsb of the mask, high five bits are the
1310 const MCOperand &MO = MI.getOperand(Op);
1311 uint32_t v = ~MO.getImm();
1312 uint32_t lsb = CountTrailingZeros_32(v);
1313 uint32_t msb = (32 - CountLeadingZeros_32 (v)) - 1;
1314 assert (v != 0 && lsb < 32 && msb < 32 && "Illegal bitfield mask!");
1315 return lsb | (msb << 5);
1318 unsigned ARMMCCodeEmitter::
1319 getRegisterListOpValue(const MCInst &MI, unsigned Op,
1320 SmallVectorImpl<MCFixup> &Fixups) const {
1323 // {7-0} = Number of registers
1326 // {15-0} = Bitfield of GPRs.
1327 unsigned Reg = MI.getOperand(Op).getReg();
1328 bool SPRRegs = llvm::ARMMCRegisterClasses[ARM::SPRRegClassID].contains(Reg);
1329 bool DPRRegs = llvm::ARMMCRegisterClasses[ARM::DPRRegClassID].contains(Reg);
1331 unsigned Binary = 0;
1333 if (SPRRegs || DPRRegs) {
1335 unsigned RegNo = getARMRegisterNumbering(Reg);
1336 unsigned NumRegs = (MI.getNumOperands() - Op) & 0xff;
1337 Binary |= (RegNo & 0x1f) << 8;
1341 Binary |= NumRegs * 2;
1343 for (unsigned I = Op, E = MI.getNumOperands(); I < E; ++I) {
1344 unsigned RegNo = getARMRegisterNumbering(MI.getOperand(I).getReg());
1345 Binary |= 1 << RegNo;
1352 /// getAddrMode6AddressOpValue - Encode an addrmode6 register number along
1353 /// with the alignment operand.
1354 unsigned ARMMCCodeEmitter::
1355 getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
1356 SmallVectorImpl<MCFixup> &Fixups) const {
1357 const MCOperand &Reg = MI.getOperand(Op);
1358 const MCOperand &Imm = MI.getOperand(Op + 1);
1360 unsigned RegNo = getARMRegisterNumbering(Reg.getReg());
1363 switch (Imm.getImm()) {
1367 case 8: Align = 0x01; break;
1368 case 16: Align = 0x02; break;
1369 case 32: Align = 0x03; break;
1372 return RegNo | (Align << 4);
1375 /// getAddrMode6OneLane32AddressOpValue - Encode an addrmode6 register number
1376 /// along with the alignment operand for use in VST1 and VLD1 with size 32.
1377 unsigned ARMMCCodeEmitter::
1378 getAddrMode6OneLane32AddressOpValue(const MCInst &MI, unsigned Op,
1379 SmallVectorImpl<MCFixup> &Fixups) const {
1380 const MCOperand &Reg = MI.getOperand(Op);
1381 const MCOperand &Imm = MI.getOperand(Op + 1);
1383 unsigned RegNo = getARMRegisterNumbering(Reg.getReg());
1386 switch (Imm.getImm()) {
1390 case 32: // Default '0' value for invalid alignments of 8, 16, 32 bytes.
1391 case 2: Align = 0x00; break;
1392 case 4: Align = 0x03; break;
1395 return RegNo | (Align << 4);
1399 /// getAddrMode6DupAddressOpValue - Encode an addrmode6 register number and
1400 /// alignment operand for use in VLD-dup instructions. This is the same as
1401 /// getAddrMode6AddressOpValue except for the alignment encoding, which is
1402 /// different for VLD4-dup.
1403 unsigned ARMMCCodeEmitter::
1404 getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
1405 SmallVectorImpl<MCFixup> &Fixups) const {
1406 const MCOperand &Reg = MI.getOperand(Op);
1407 const MCOperand &Imm = MI.getOperand(Op + 1);
1409 unsigned RegNo = getARMRegisterNumbering(Reg.getReg());
1412 switch (Imm.getImm()) {
1416 case 8: Align = 0x01; break;
1417 case 16: Align = 0x03; break;
1420 return RegNo | (Align << 4);
1423 unsigned ARMMCCodeEmitter::
1424 getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
1425 SmallVectorImpl<MCFixup> &Fixups) const {
1426 const MCOperand &MO = MI.getOperand(Op);
1427 if (MO.getReg() == 0) return 0x0D;
1428 return getARMRegisterNumbering(MO.getReg());
1431 unsigned ARMMCCodeEmitter::
1432 getShiftRight8Imm(const MCInst &MI, unsigned Op,
1433 SmallVectorImpl<MCFixup> &Fixups) const {
1434 return 8 - MI.getOperand(Op).getImm();
1437 unsigned ARMMCCodeEmitter::
1438 getShiftRight16Imm(const MCInst &MI, unsigned Op,
1439 SmallVectorImpl<MCFixup> &Fixups) const {
1440 return 16 - MI.getOperand(Op).getImm();
1443 unsigned ARMMCCodeEmitter::
1444 getShiftRight32Imm(const MCInst &MI, unsigned Op,
1445 SmallVectorImpl<MCFixup> &Fixups) const {
1446 return 32 - MI.getOperand(Op).getImm();
1449 unsigned ARMMCCodeEmitter::
1450 getShiftRight64Imm(const MCInst &MI, unsigned Op,
1451 SmallVectorImpl<MCFixup> &Fixups) const {
1452 return 64 - MI.getOperand(Op).getImm();
1455 void ARMMCCodeEmitter::
1456 EncodeInstruction(const MCInst &MI, raw_ostream &OS,
1457 SmallVectorImpl<MCFixup> &Fixups) const {
1458 // Pseudo instructions don't get encoded.
1459 const MCInstrDesc &Desc = MCII.get(MI.getOpcode());
1460 uint64_t TSFlags = Desc.TSFlags;
1461 if ((TSFlags & ARMII::FormMask) == ARMII::Pseudo)
1465 if (Desc.getSize() == 2 || Desc.getSize() == 4)
1466 Size = Desc.getSize();
1468 llvm_unreachable("Unexpected instruction size!");
1470 uint32_t Binary = getBinaryCodeForInstr(MI, Fixups);
1471 // Thumb 32-bit wide instructions need to emit the high order halfword
1473 if (isThumb() && Size == 4) {
1474 EmitConstant(Binary >> 16, 2, OS);
1475 EmitConstant(Binary & 0xffff, 2, OS);
1477 EmitConstant(Binary, Size, OS);
1478 ++MCNumEmitted; // Keep track of the # of mi's emitted.
1481 #include "ARMGenMCCodeEmitter.inc"