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/ARMMCTargetDesc.h"
16 #include "MCTargetDesc/ARMAddressingModes.h"
17 #include "MCTargetDesc/ARMBaseInfo.h"
18 #include "MCTargetDesc/ARMFixupKinds.h"
19 #include "MCTargetDesc/ARMMCExpr.h"
20 #include "llvm/ADT/APFloat.h"
21 #include "llvm/ADT/Statistic.h"
22 #include "llvm/MC/MCCodeEmitter.h"
23 #include "llvm/MC/MCContext.h"
24 #include "llvm/MC/MCExpr.h"
25 #include "llvm/MC/MCInst.h"
26 #include "llvm/MC/MCInstrInfo.h"
27 #include "llvm/MC/MCRegisterInfo.h"
28 #include "llvm/MC/MCSubtargetInfo.h"
29 #include "llvm/Support/ErrorHandling.h"
30 #include "llvm/Support/raw_ostream.h"
34 STATISTIC(MCNumEmitted, "Number of MC instructions emitted.");
35 STATISTIC(MCNumCPRelocations, "Number of constant pool relocations created.");
38 class ARMMCCodeEmitter : public MCCodeEmitter {
39 ARMMCCodeEmitter(const ARMMCCodeEmitter &) LLVM_DELETED_FUNCTION;
40 void operator=(const ARMMCCodeEmitter &) LLVM_DELETED_FUNCTION;
41 const MCInstrInfo &MCII;
45 ARMMCCodeEmitter(const MCInstrInfo &mcii, MCContext &ctx)
46 : MCII(mcii), CTX(ctx) {
49 ~ARMMCCodeEmitter() {}
51 bool isThumb(const MCSubtargetInfo &STI) const {
52 return (STI.getFeatureBits() & ARM::ModeThumb) != 0;
54 bool isThumb2(const MCSubtargetInfo &STI) const {
55 return isThumb(STI) && (STI.getFeatureBits() & ARM::FeatureThumb2) != 0;
57 bool isTargetMachO(const MCSubtargetInfo &STI) const {
58 Triple TT(STI.getTargetTriple());
59 return TT.isOSBinFormatMachO();
62 unsigned getMachineSoImmOpValue(unsigned SoImm) const;
64 // getBinaryCodeForInstr - TableGen'erated function for getting the
65 // binary encoding for an instruction.
66 uint64_t getBinaryCodeForInstr(const MCInst &MI,
67 SmallVectorImpl<MCFixup> &Fixups,
68 const MCSubtargetInfo &STI) 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,
74 const MCSubtargetInfo &STI) const;
76 /// getHiLo16ImmOpValue - Return the encoding for the hi / low 16-bit of
77 /// the specified operand. This is used for operands with :lower16: and
78 /// :upper16: prefixes.
79 uint32_t getHiLo16ImmOpValue(const MCInst &MI, unsigned OpIdx,
80 SmallVectorImpl<MCFixup> &Fixups,
81 const MCSubtargetInfo &STI) const;
83 bool EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx,
84 unsigned &Reg, unsigned &Imm,
85 SmallVectorImpl<MCFixup> &Fixups,
86 const MCSubtargetInfo &STI) const;
88 /// getThumbBLTargetOpValue - Return encoding info for Thumb immediate
90 uint32_t getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
91 SmallVectorImpl<MCFixup> &Fixups,
92 const MCSubtargetInfo &STI) const;
94 /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate
95 /// BLX branch target.
96 uint32_t getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
97 SmallVectorImpl<MCFixup> &Fixups,
98 const MCSubtargetInfo &STI) const;
100 /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target.
101 uint32_t getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx,
102 SmallVectorImpl<MCFixup> &Fixups,
103 const MCSubtargetInfo &STI) const;
105 /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target.
106 uint32_t getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx,
107 SmallVectorImpl<MCFixup> &Fixups,
108 const MCSubtargetInfo &STI) const;
110 /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target.
111 uint32_t getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx,
112 SmallVectorImpl<MCFixup> &Fixups,
113 const MCSubtargetInfo &STI) const;
115 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate
117 uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
118 SmallVectorImpl<MCFixup> &Fixups,
119 const MCSubtargetInfo &STI) const;
121 /// getUnconditionalBranchTargetOpValue - Return encoding info for 24-bit
122 /// immediate Thumb2 direct branch target.
123 uint32_t getUnconditionalBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
124 SmallVectorImpl<MCFixup> &Fixups,
125 const MCSubtargetInfo &STI) const;
127 /// getARMBranchTargetOpValue - Return encoding info for 24-bit immediate
129 uint32_t getARMBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
130 SmallVectorImpl<MCFixup> &Fixups,
131 const MCSubtargetInfo &STI) const;
132 uint32_t getARMBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
133 SmallVectorImpl<MCFixup> &Fixups,
134 const MCSubtargetInfo &STI) const;
135 uint32_t getARMBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
136 SmallVectorImpl<MCFixup> &Fixups,
137 const MCSubtargetInfo &STI) const;
139 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate
140 /// ADR label target.
141 uint32_t getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
142 SmallVectorImpl<MCFixup> &Fixups,
143 const MCSubtargetInfo &STI) const;
144 uint32_t getThumbAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
145 SmallVectorImpl<MCFixup> &Fixups,
146 const MCSubtargetInfo &STI) const;
147 uint32_t getT2AdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
148 SmallVectorImpl<MCFixup> &Fixups,
149 const MCSubtargetInfo &STI) const;
152 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12'
154 uint32_t getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
155 SmallVectorImpl<MCFixup> &Fixups,
156 const MCSubtargetInfo &STI) const;
158 /// getThumbAddrModeRegRegOpValue - Return encoding for 'reg + reg' operand.
159 uint32_t getThumbAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx,
160 SmallVectorImpl<MCFixup> &Fixups,
161 const MCSubtargetInfo &STI) const;
163 /// getT2AddrModeImm8s4OpValue - Return encoding info for 'reg +/- imm8<<2'
165 uint32_t getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
166 SmallVectorImpl<MCFixup> &Fixups,
167 const MCSubtargetInfo &STI) const;
169 /// getT2AddrModeImm0_1020s4OpValue - Return encoding info for 'reg + imm8<<2'
171 uint32_t getT2AddrModeImm0_1020s4OpValue(const MCInst &MI, unsigned OpIdx,
172 SmallVectorImpl<MCFixup> &Fixups,
173 const MCSubtargetInfo &STI) const;
175 /// getT2Imm8s4OpValue - Return encoding info for '+/- imm8<<2'
177 uint32_t getT2Imm8s4OpValue(const MCInst &MI, unsigned OpIdx,
178 SmallVectorImpl<MCFixup> &Fixups,
179 const MCSubtargetInfo &STI) const;
182 /// getLdStSORegOpValue - Return encoding info for 'reg +/- reg shop imm'
183 /// operand as needed by load/store instructions.
184 uint32_t getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
185 SmallVectorImpl<MCFixup> &Fixups,
186 const MCSubtargetInfo &STI) const;
188 /// getLdStmModeOpValue - Return encoding for load/store multiple mode.
189 uint32_t getLdStmModeOpValue(const MCInst &MI, unsigned OpIdx,
190 SmallVectorImpl<MCFixup> &Fixups,
191 const MCSubtargetInfo &STI) const {
192 ARM_AM::AMSubMode Mode = (ARM_AM::AMSubMode)MI.getOperand(OpIdx).getImm();
194 default: llvm_unreachable("Unknown addressing sub-mode!");
195 case ARM_AM::da: return 0;
196 case ARM_AM::ia: return 1;
197 case ARM_AM::db: return 2;
198 case ARM_AM::ib: return 3;
201 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
203 unsigned getShiftOp(ARM_AM::ShiftOpc ShOpc) const {
205 case ARM_AM::no_shift:
206 case ARM_AM::lsl: return 0;
207 case ARM_AM::lsr: return 1;
208 case ARM_AM::asr: return 2;
210 case ARM_AM::rrx: return 3;
212 llvm_unreachable("Invalid ShiftOpc!");
215 /// getAddrMode2OpValue - Return encoding for addrmode2 operands.
216 uint32_t getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
217 SmallVectorImpl<MCFixup> &Fixups,
218 const MCSubtargetInfo &STI) const;
220 /// getAddrMode2OffsetOpValue - Return encoding for am2offset operands.
221 uint32_t getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
222 SmallVectorImpl<MCFixup> &Fixups,
223 const MCSubtargetInfo &STI) const;
225 /// getPostIdxRegOpValue - Return encoding for postidx_reg operands.
226 uint32_t getPostIdxRegOpValue(const MCInst &MI, unsigned OpIdx,
227 SmallVectorImpl<MCFixup> &Fixups,
228 const MCSubtargetInfo &STI) const;
230 /// getAddrMode3OffsetOpValue - Return encoding for am3offset operands.
231 uint32_t getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
232 SmallVectorImpl<MCFixup> &Fixups,
233 const MCSubtargetInfo &STI) const;
235 /// getAddrMode3OpValue - Return encoding for addrmode3 operands.
236 uint32_t getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
237 SmallVectorImpl<MCFixup> &Fixups,
238 const MCSubtargetInfo &STI) const;
240 /// getAddrModeThumbSPOpValue - Return encoding info for 'reg +/- imm12'
242 uint32_t getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx,
243 SmallVectorImpl<MCFixup> &Fixups,
244 const MCSubtargetInfo &STI) const;
246 /// getAddrModeISOpValue - Encode the t_addrmode_is# operands.
247 uint32_t getAddrModeISOpValue(const MCInst &MI, unsigned OpIdx,
248 SmallVectorImpl<MCFixup> &Fixups,
249 const MCSubtargetInfo &STI) const;
251 /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands.
252 uint32_t getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx,
253 SmallVectorImpl<MCFixup> &Fixups,
254 const MCSubtargetInfo &STI) const;
256 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm8' operand.
257 uint32_t getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
258 SmallVectorImpl<MCFixup> &Fixups,
259 const MCSubtargetInfo &STI) const;
261 /// getCCOutOpValue - Return encoding of the 's' bit.
262 unsigned getCCOutOpValue(const MCInst &MI, unsigned Op,
263 SmallVectorImpl<MCFixup> &Fixups,
264 const MCSubtargetInfo &STI) const {
265 // The operand is either reg0 or CPSR. The 's' bit is encoded as '0' or
267 return MI.getOperand(Op).getReg() == ARM::CPSR;
270 /// getSOImmOpValue - Return an encoded 12-bit shifted-immediate value.
271 unsigned getSOImmOpValue(const MCInst &MI, unsigned Op,
272 SmallVectorImpl<MCFixup> &Fixups,
273 const MCSubtargetInfo &STI) const {
274 unsigned SoImm = MI.getOperand(Op).getImm();
275 int SoImmVal = ARM_AM::getSOImmVal(SoImm);
276 assert(SoImmVal != -1 && "Not a valid so_imm value!");
278 // Encode rotate_imm.
279 unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1)
280 << ARMII::SoRotImmShift;
283 Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal);
287 /// getT2SOImmOpValue - Return an encoded 12-bit shifted-immediate value.
288 unsigned getT2SOImmOpValue(const MCInst &MI, unsigned Op,
289 SmallVectorImpl<MCFixup> &Fixups,
290 const MCSubtargetInfo &STI) const {
291 unsigned SoImm = MI.getOperand(Op).getImm();
292 unsigned Encoded = ARM_AM::getT2SOImmVal(SoImm);
293 assert(Encoded != ~0U && "Not a Thumb2 so_imm value?");
297 unsigned getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
298 SmallVectorImpl<MCFixup> &Fixups,
299 const MCSubtargetInfo &STI) const;
300 unsigned getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
301 SmallVectorImpl<MCFixup> &Fixups,
302 const MCSubtargetInfo &STI) const;
303 unsigned getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
304 SmallVectorImpl<MCFixup> &Fixups,
305 const MCSubtargetInfo &STI) const;
306 unsigned getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
307 SmallVectorImpl<MCFixup> &Fixups,
308 const MCSubtargetInfo &STI) const;
310 /// getSORegOpValue - Return an encoded so_reg shifted register value.
311 unsigned getSORegRegOpValue(const MCInst &MI, unsigned Op,
312 SmallVectorImpl<MCFixup> &Fixups,
313 const MCSubtargetInfo &STI) const;
314 unsigned getSORegImmOpValue(const MCInst &MI, unsigned Op,
315 SmallVectorImpl<MCFixup> &Fixups,
316 const MCSubtargetInfo &STI) const;
317 unsigned getT2SORegOpValue(const MCInst &MI, unsigned Op,
318 SmallVectorImpl<MCFixup> &Fixups,
319 const MCSubtargetInfo &STI) const;
321 unsigned getNEONVcvtImm32OpValue(const MCInst &MI, unsigned Op,
322 SmallVectorImpl<MCFixup> &Fixups,
323 const MCSubtargetInfo &STI) const {
324 return 64 - MI.getOperand(Op).getImm();
327 unsigned getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
328 SmallVectorImpl<MCFixup> &Fixups,
329 const MCSubtargetInfo &STI) const;
331 unsigned getRegisterListOpValue(const MCInst &MI, unsigned Op,
332 SmallVectorImpl<MCFixup> &Fixups,
333 const MCSubtargetInfo &STI) const;
334 unsigned getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
335 SmallVectorImpl<MCFixup> &Fixups,
336 const MCSubtargetInfo &STI) const;
337 unsigned getAddrMode6OneLane32AddressOpValue(const MCInst &MI, unsigned Op,
338 SmallVectorImpl<MCFixup> &Fixups,
339 const MCSubtargetInfo &STI) const;
340 unsigned getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
341 SmallVectorImpl<MCFixup> &Fixups,
342 const MCSubtargetInfo &STI) const;
343 unsigned getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
344 SmallVectorImpl<MCFixup> &Fixups,
345 const MCSubtargetInfo &STI) const;
347 unsigned getShiftRight8Imm(const MCInst &MI, unsigned Op,
348 SmallVectorImpl<MCFixup> &Fixups,
349 const MCSubtargetInfo &STI) const;
350 unsigned getShiftRight16Imm(const MCInst &MI, unsigned Op,
351 SmallVectorImpl<MCFixup> &Fixups,
352 const MCSubtargetInfo &STI) const;
353 unsigned getShiftRight32Imm(const MCInst &MI, unsigned Op,
354 SmallVectorImpl<MCFixup> &Fixups,
355 const MCSubtargetInfo &STI) const;
356 unsigned getShiftRight64Imm(const MCInst &MI, unsigned Op,
357 SmallVectorImpl<MCFixup> &Fixups,
358 const MCSubtargetInfo &STI) const;
360 unsigned getThumbSRImmOpValue(const MCInst &MI, unsigned Op,
361 SmallVectorImpl<MCFixup> &Fixups,
362 const MCSubtargetInfo &STI) const;
364 unsigned NEONThumb2DataIPostEncoder(const MCInst &MI,
365 unsigned EncodedValue,
366 const MCSubtargetInfo &STI) const;
367 unsigned NEONThumb2LoadStorePostEncoder(const MCInst &MI,
368 unsigned EncodedValue,
369 const MCSubtargetInfo &STI) const;
370 unsigned NEONThumb2DupPostEncoder(const MCInst &MI,
371 unsigned EncodedValue,
372 const MCSubtargetInfo &STI) const;
373 unsigned NEONThumb2V8PostEncoder(const MCInst &MI,
374 unsigned EncodedValue,
375 const MCSubtargetInfo &STI) const;
377 unsigned VFPThumb2PostEncoder(const MCInst &MI,
378 unsigned EncodedValue,
379 const MCSubtargetInfo &STI) const;
381 void EmitByte(unsigned char C, raw_ostream &OS) const {
385 void EmitConstant(uint64_t Val, unsigned Size, raw_ostream &OS) const {
386 // Output the constant in little endian byte order.
387 for (unsigned i = 0; i != Size; ++i) {
388 EmitByte(Val & 255, OS);
393 void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
394 SmallVectorImpl<MCFixup> &Fixups,
395 const MCSubtargetInfo &STI) const;
398 } // end anonymous namespace
400 MCCodeEmitter *llvm::createARMMCCodeEmitter(const MCInstrInfo &MCII,
401 const MCRegisterInfo &MRI,
402 const MCSubtargetInfo &STI,
404 return new ARMMCCodeEmitter(MCII, Ctx);
407 /// NEONThumb2DataIPostEncoder - Post-process encoded NEON data-processing
408 /// instructions, and rewrite them to their Thumb2 form if we are currently in
410 unsigned ARMMCCodeEmitter::NEONThumb2DataIPostEncoder(const MCInst &MI,
411 unsigned EncodedValue,
412 const MCSubtargetInfo &STI) const {
414 // NEON Thumb2 data-processsing encodings are very simple: bit 24 is moved
415 // to bit 12 of the high half-word (i.e. bit 28), and bits 27-24 are
417 unsigned Bit24 = EncodedValue & 0x01000000;
418 unsigned Bit28 = Bit24 << 4;
419 EncodedValue &= 0xEFFFFFFF;
420 EncodedValue |= Bit28;
421 EncodedValue |= 0x0F000000;
427 /// NEONThumb2LoadStorePostEncoder - Post-process encoded NEON load/store
428 /// instructions, and rewrite them to their Thumb2 form if we are currently in
430 unsigned ARMMCCodeEmitter::NEONThumb2LoadStorePostEncoder(const MCInst &MI,
431 unsigned EncodedValue,
432 const MCSubtargetInfo &STI) const {
434 EncodedValue &= 0xF0FFFFFF;
435 EncodedValue |= 0x09000000;
441 /// NEONThumb2DupPostEncoder - Post-process encoded NEON vdup
442 /// instructions, and rewrite them to their Thumb2 form if we are currently in
444 unsigned ARMMCCodeEmitter::NEONThumb2DupPostEncoder(const MCInst &MI,
445 unsigned EncodedValue,
446 const MCSubtargetInfo &STI) const {
448 EncodedValue &= 0x00FFFFFF;
449 EncodedValue |= 0xEE000000;
455 /// Post-process encoded NEON v8 instructions, and rewrite them to Thumb2 form
456 /// if we are in Thumb2.
457 unsigned ARMMCCodeEmitter::NEONThumb2V8PostEncoder(const MCInst &MI,
458 unsigned EncodedValue,
459 const MCSubtargetInfo &STI) const {
461 EncodedValue |= 0xC000000; // Set bits 27-26
467 /// VFPThumb2PostEncoder - Post-process encoded VFP instructions and rewrite
468 /// them to their Thumb2 form if we are currently in Thumb2 mode.
469 unsigned ARMMCCodeEmitter::
470 VFPThumb2PostEncoder(const MCInst &MI, unsigned EncodedValue,
471 const MCSubtargetInfo &STI) const {
473 EncodedValue &= 0x0FFFFFFF;
474 EncodedValue |= 0xE0000000;
479 /// getMachineOpValue - Return binary encoding of operand. If the machine
480 /// operand requires relocation, record the relocation and return zero.
481 unsigned ARMMCCodeEmitter::
482 getMachineOpValue(const MCInst &MI, const MCOperand &MO,
483 SmallVectorImpl<MCFixup> &Fixups,
484 const MCSubtargetInfo &STI) const {
486 unsigned Reg = MO.getReg();
487 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg);
489 // Q registers are encoded as 2x their register number.
493 case ARM::Q0: case ARM::Q1: case ARM::Q2: case ARM::Q3:
494 case ARM::Q4: case ARM::Q5: case ARM::Q6: case ARM::Q7:
495 case ARM::Q8: case ARM::Q9: case ARM::Q10: case ARM::Q11:
496 case ARM::Q12: case ARM::Q13: case ARM::Q14: case ARM::Q15:
499 } else if (MO.isImm()) {
500 return static_cast<unsigned>(MO.getImm());
501 } else if (MO.isFPImm()) {
502 return static_cast<unsigned>(APFloat(MO.getFPImm())
503 .bitcastToAPInt().getHiBits(32).getLimitedValue());
506 llvm_unreachable("Unable to encode MCOperand!");
509 /// getAddrModeImmOpValue - Return encoding info for 'reg +/- imm' operand.
510 bool ARMMCCodeEmitter::
511 EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx, unsigned &Reg,
512 unsigned &Imm, SmallVectorImpl<MCFixup> &Fixups,
513 const MCSubtargetInfo &STI) const {
514 const MCOperand &MO = MI.getOperand(OpIdx);
515 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
517 Reg = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
519 int32_t SImm = MO1.getImm();
522 // Special value for #-0
523 if (SImm == INT32_MIN) {
528 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
538 /// getBranchTargetOpValue - Helper function to get the branch target operand,
539 /// which is either an immediate or requires a fixup.
540 static uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
542 SmallVectorImpl<MCFixup> &Fixups,
543 const MCSubtargetInfo &STI) {
544 const MCOperand &MO = MI.getOperand(OpIdx);
546 // If the destination is an immediate, we have nothing to do.
547 if (MO.isImm()) return MO.getImm();
548 assert(MO.isExpr() && "Unexpected branch target type!");
549 const MCExpr *Expr = MO.getExpr();
550 MCFixupKind Kind = MCFixupKind(FixupKind);
551 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
553 // All of the information is in the fixup.
557 // Thumb BL and BLX use a strange offset encoding where bits 22 and 21 are
558 // determined by negating them and XOR'ing them with bit 23.
559 static int32_t encodeThumbBLOffset(int32_t offset) {
561 uint32_t S = (offset & 0x800000) >> 23;
562 uint32_t J1 = (offset & 0x400000) >> 22;
563 uint32_t J2 = (offset & 0x200000) >> 21;
576 /// getThumbBLTargetOpValue - Return encoding info for immediate branch target.
577 uint32_t ARMMCCodeEmitter::
578 getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
579 SmallVectorImpl<MCFixup> &Fixups,
580 const MCSubtargetInfo &STI) const {
581 const MCOperand MO = MI.getOperand(OpIdx);
583 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bl,
585 return encodeThumbBLOffset(MO.getImm());
588 /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate
589 /// BLX branch target.
590 uint32_t ARMMCCodeEmitter::
591 getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
592 SmallVectorImpl<MCFixup> &Fixups,
593 const MCSubtargetInfo &STI) const {
594 const MCOperand MO = MI.getOperand(OpIdx);
596 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_blx,
598 return encodeThumbBLOffset(MO.getImm());
601 /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target.
602 uint32_t ARMMCCodeEmitter::
603 getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx,
604 SmallVectorImpl<MCFixup> &Fixups,
605 const MCSubtargetInfo &STI) const {
606 const MCOperand MO = MI.getOperand(OpIdx);
608 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_br,
610 return (MO.getImm() >> 1);
613 /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target.
614 uint32_t ARMMCCodeEmitter::
615 getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx,
616 SmallVectorImpl<MCFixup> &Fixups,
617 const MCSubtargetInfo &STI) const {
618 const MCOperand MO = MI.getOperand(OpIdx);
620 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bcc,
622 return (MO.getImm() >> 1);
625 /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target.
626 uint32_t ARMMCCodeEmitter::
627 getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx,
628 SmallVectorImpl<MCFixup> &Fixups,
629 const MCSubtargetInfo &STI) const {
630 const MCOperand MO = MI.getOperand(OpIdx);
632 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cb, Fixups, STI);
633 return (MO.getImm() >> 1);
636 /// Return true if this branch has a non-always predication
637 static bool HasConditionalBranch(const MCInst &MI) {
638 int NumOp = MI.getNumOperands();
640 for (int i = 0; i < NumOp-1; ++i) {
641 const MCOperand &MCOp1 = MI.getOperand(i);
642 const MCOperand &MCOp2 = MI.getOperand(i + 1);
643 if (MCOp1.isImm() && MCOp2.isReg() &&
644 (MCOp2.getReg() == 0 || MCOp2.getReg() == ARM::CPSR)) {
645 if (ARMCC::CondCodes(MCOp1.getImm()) != ARMCC::AL)
653 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch
655 uint32_t ARMMCCodeEmitter::
656 getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
657 SmallVectorImpl<MCFixup> &Fixups,
658 const MCSubtargetInfo &STI) const {
659 // FIXME: This really, really shouldn't use TargetMachine. We don't want
660 // coupling between MC and TM anywhere we can help it.
663 ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_condbranch, Fixups, STI);
664 return getARMBranchTargetOpValue(MI, OpIdx, Fixups, STI);
667 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch
669 uint32_t ARMMCCodeEmitter::
670 getARMBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
671 SmallVectorImpl<MCFixup> &Fixups,
672 const MCSubtargetInfo &STI) const {
673 const MCOperand MO = MI.getOperand(OpIdx);
675 if (HasConditionalBranch(MI))
676 return ::getBranchTargetOpValue(MI, OpIdx,
677 ARM::fixup_arm_condbranch, Fixups, STI);
678 return ::getBranchTargetOpValue(MI, OpIdx,
679 ARM::fixup_arm_uncondbranch, Fixups, STI);
682 return MO.getImm() >> 2;
685 uint32_t ARMMCCodeEmitter::
686 getARMBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
687 SmallVectorImpl<MCFixup> &Fixups,
688 const MCSubtargetInfo &STI) const {
689 const MCOperand MO = MI.getOperand(OpIdx);
691 if (HasConditionalBranch(MI))
692 return ::getBranchTargetOpValue(MI, OpIdx,
693 ARM::fixup_arm_condbl, Fixups, STI);
694 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_uncondbl, Fixups, STI);
697 return MO.getImm() >> 2;
700 uint32_t ARMMCCodeEmitter::
701 getARMBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
702 SmallVectorImpl<MCFixup> &Fixups,
703 const MCSubtargetInfo &STI) const {
704 const MCOperand MO = MI.getOperand(OpIdx);
706 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_blx, Fixups, STI);
708 return MO.getImm() >> 1;
711 /// getUnconditionalBranchTargetOpValue - Return encoding info for 24-bit
712 /// immediate branch target.
713 uint32_t ARMMCCodeEmitter::
714 getUnconditionalBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
715 SmallVectorImpl<MCFixup> &Fixups,
716 const MCSubtargetInfo &STI) const {
718 const MCOperand MO = MI.getOperand(OpIdx);
721 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_uncondbranch, Fixups, STI);
723 Val = MO.getImm() >> 1;
725 bool I = (Val & 0x800000);
726 bool J1 = (Val & 0x400000);
727 bool J2 = (Val & 0x200000);
741 /// getAdrLabelOpValue - Return encoding info for 12-bit shifted-immediate
742 /// ADR label target.
743 uint32_t ARMMCCodeEmitter::
744 getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
745 SmallVectorImpl<MCFixup> &Fixups,
746 const MCSubtargetInfo &STI) const {
747 const MCOperand MO = MI.getOperand(OpIdx);
749 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_adr_pcrel_12,
751 int64_t offset = MO.getImm();
752 uint32_t Val = 0x2000;
755 if (offset == INT32_MIN) {
758 } else if (offset < 0) {
761 SoImmVal = ARM_AM::getSOImmVal(offset);
765 SoImmVal = ARM_AM::getSOImmVal(offset);
768 SoImmVal = ARM_AM::getSOImmVal(offset);
772 SoImmVal = ARM_AM::getSOImmVal(offset);
776 assert(SoImmVal != -1 && "Not a valid so_imm value!");
782 /// getT2AdrLabelOpValue - Return encoding info for 12-bit immediate ADR label
784 uint32_t ARMMCCodeEmitter::
785 getT2AdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
786 SmallVectorImpl<MCFixup> &Fixups,
787 const MCSubtargetInfo &STI) const {
788 const MCOperand MO = MI.getOperand(OpIdx);
790 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_adr_pcrel_12,
792 int32_t Val = MO.getImm();
793 if (Val == INT32_MIN)
802 /// getThumbAdrLabelOpValue - Return encoding info for 8-bit immediate ADR label
804 uint32_t ARMMCCodeEmitter::
805 getThumbAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
806 SmallVectorImpl<MCFixup> &Fixups,
807 const MCSubtargetInfo &STI) const {
808 const MCOperand MO = MI.getOperand(OpIdx);
810 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_thumb_adr_pcrel_10,
815 /// getThumbAddrModeRegRegOpValue - Return encoding info for 'reg + reg'
817 uint32_t ARMMCCodeEmitter::
818 getThumbAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx,
819 SmallVectorImpl<MCFixup> &,
820 const MCSubtargetInfo &STI) const {
824 const MCOperand &MO1 = MI.getOperand(OpIdx);
825 const MCOperand &MO2 = MI.getOperand(OpIdx + 1);
826 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
827 unsigned Rm = CTX.getRegisterInfo()->getEncodingValue(MO2.getReg());
828 return (Rm << 3) | Rn;
831 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12' operand.
832 uint32_t ARMMCCodeEmitter::
833 getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
834 SmallVectorImpl<MCFixup> &Fixups,
835 const MCSubtargetInfo &STI) const {
837 // {12} = (U)nsigned (add == '1', sub == '0')
841 // If The first operand isn't a register, we have a label reference.
842 const MCOperand &MO = MI.getOperand(OpIdx);
844 Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
848 const MCExpr *Expr = MO.getExpr();
849 isAdd = false ; // 'U' bit is set as part of the fixup.
853 Kind = MCFixupKind(ARM::fixup_t2_ldst_pcrel_12);
855 Kind = MCFixupKind(ARM::fixup_arm_ldst_pcrel_12);
856 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
858 ++MCNumCPRelocations;
861 int32_t Offset = MO.getImm();
862 if (Offset == INT32_MIN) {
865 } else if (Offset < 0) {
872 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm12, Fixups, STI);
874 uint32_t Binary = Imm12 & 0xfff;
875 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
878 Binary |= (Reg << 13);
882 /// getT2Imm8s4OpValue - Return encoding info for
883 /// '+/- imm8<<2' operand.
884 uint32_t ARMMCCodeEmitter::
885 getT2Imm8s4OpValue(const MCInst &MI, unsigned OpIdx,
886 SmallVectorImpl<MCFixup> &Fixups,
887 const MCSubtargetInfo &STI) const {
888 // FIXME: The immediate operand should have already been encoded like this
889 // before ever getting here. The encoder method should just need to combine
890 // the MI operands for the register and the offset into a single
891 // representation for the complex operand in the .td file. This isn't just
892 // style, unfortunately. As-is, we can't represent the distinct encoding
895 // {8} = (U)nsigned (add == '1', sub == '0')
897 int32_t Imm8 = MI.getOperand(OpIdx).getImm();
898 bool isAdd = Imm8 >= 0;
900 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
902 Imm8 = -(uint32_t)Imm8;
907 uint32_t Binary = Imm8 & 0xff;
908 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
914 /// getT2AddrModeImm8s4OpValue - Return encoding info for
915 /// 'reg +/- imm8<<2' operand.
916 uint32_t ARMMCCodeEmitter::
917 getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
918 SmallVectorImpl<MCFixup> &Fixups,
919 const MCSubtargetInfo &STI) const {
921 // {8} = (U)nsigned (add == '1', sub == '0')
925 // If The first operand isn't a register, we have a label reference.
926 const MCOperand &MO = MI.getOperand(OpIdx);
928 Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
930 isAdd = false ; // 'U' bit is set as part of the fixup.
932 assert(MO.isExpr() && "Unexpected machine operand type!");
933 const MCExpr *Expr = MO.getExpr();
934 MCFixupKind Kind = MCFixupKind(ARM::fixup_t2_pcrel_10);
935 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
937 ++MCNumCPRelocations;
939 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups, STI);
941 // FIXME: The immediate operand should have already been encoded like this
942 // before ever getting here. The encoder method should just need to combine
943 // the MI operands for the register and the offset into a single
944 // representation for the complex operand in the .td file. This isn't just
945 // style, unfortunately. As-is, we can't represent the distinct encoding
947 uint32_t Binary = (Imm8 >> 2) & 0xff;
948 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
951 Binary |= (Reg << 9);
955 /// getT2AddrModeImm0_1020s4OpValue - Return encoding info for
956 /// 'reg + imm8<<2' operand.
957 uint32_t ARMMCCodeEmitter::
958 getT2AddrModeImm0_1020s4OpValue(const MCInst &MI, unsigned OpIdx,
959 SmallVectorImpl<MCFixup> &Fixups,
960 const MCSubtargetInfo &STI) const {
963 const MCOperand &MO = MI.getOperand(OpIdx);
964 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
965 unsigned Reg = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
966 unsigned Imm8 = MO1.getImm();
967 return (Reg << 8) | Imm8;
970 // FIXME: This routine assumes that a binary
971 // expression will always result in a PCRel expression
972 // In reality, its only true if one or more subexpressions
973 // is itself a PCRel (i.e. "." in asm or some other pcrel construct)
974 // but this is good enough for now.
975 static bool EvaluateAsPCRel(const MCExpr *Expr) {
976 switch (Expr->getKind()) {
977 default: llvm_unreachable("Unexpected expression type");
978 case MCExpr::SymbolRef: return false;
979 case MCExpr::Binary: return true;
984 ARMMCCodeEmitter::getHiLo16ImmOpValue(const MCInst &MI, unsigned OpIdx,
985 SmallVectorImpl<MCFixup> &Fixups,
986 const MCSubtargetInfo &STI) const {
987 // {20-16} = imm{15-12}
988 // {11-0} = imm{11-0}
989 const MCOperand &MO = MI.getOperand(OpIdx);
991 // Hi / lo 16 bits already extracted during earlier passes.
992 return static_cast<unsigned>(MO.getImm());
994 // Handle :upper16: and :lower16: assembly prefixes.
995 const MCExpr *E = MO.getExpr();
997 if (E->getKind() == MCExpr::Target) {
998 const ARMMCExpr *ARM16Expr = cast<ARMMCExpr>(E);
999 E = ARM16Expr->getSubExpr();
1001 if (const MCConstantExpr *MCE = dyn_cast<MCConstantExpr>(E)) {
1002 const int64_t Value = MCE->getValue();
1003 if (Value > UINT32_MAX)
1004 report_fatal_error("constant value truncated (limited to 32-bit)");
1006 switch (ARM16Expr->getKind()) {
1007 case ARMMCExpr::VK_ARM_HI16:
1008 return (int32_t(Value) & 0xffff0000) >> 16;
1009 case ARMMCExpr::VK_ARM_LO16:
1010 return (int32_t(Value) & 0x0000ffff);
1011 default: llvm_unreachable("Unsupported ARMFixup");
1015 switch (ARM16Expr->getKind()) {
1016 default: llvm_unreachable("Unsupported ARMFixup");
1017 case ARMMCExpr::VK_ARM_HI16:
1018 if (!isTargetMachO(STI) && EvaluateAsPCRel(E))
1019 Kind = MCFixupKind(isThumb2(STI)
1020 ? ARM::fixup_t2_movt_hi16_pcrel
1021 : ARM::fixup_arm_movt_hi16_pcrel);
1023 Kind = MCFixupKind(isThumb2(STI)
1024 ? ARM::fixup_t2_movt_hi16
1025 : ARM::fixup_arm_movt_hi16);
1027 case ARMMCExpr::VK_ARM_LO16:
1028 if (!isTargetMachO(STI) && EvaluateAsPCRel(E))
1029 Kind = MCFixupKind(isThumb2(STI)
1030 ? ARM::fixup_t2_movw_lo16_pcrel
1031 : ARM::fixup_arm_movw_lo16_pcrel);
1033 Kind = MCFixupKind(isThumb2(STI)
1034 ? ARM::fixup_t2_movw_lo16
1035 : ARM::fixup_arm_movw_lo16);
1038 Fixups.push_back(MCFixup::Create(0, E, Kind, MI.getLoc()));
1041 // If the expression doesn't have :upper16: or :lower16: on it,
1042 // it's just a plain immediate expression, and those evaluate to
1043 // the lower 16 bits of the expression regardless of whether
1044 // we have a movt or a movw.
1045 if (!isTargetMachO(STI) && EvaluateAsPCRel(E))
1046 Kind = MCFixupKind(isThumb2(STI)
1047 ? ARM::fixup_t2_movw_lo16_pcrel
1048 : ARM::fixup_arm_movw_lo16_pcrel);
1050 Kind = MCFixupKind(isThumb2(STI)
1051 ? ARM::fixup_t2_movw_lo16
1052 : ARM::fixup_arm_movw_lo16);
1053 Fixups.push_back(MCFixup::Create(0, E, Kind, MI.getLoc()));
1057 uint32_t ARMMCCodeEmitter::
1058 getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
1059 SmallVectorImpl<MCFixup> &Fixups,
1060 const MCSubtargetInfo &STI) const {
1061 const MCOperand &MO = MI.getOperand(OpIdx);
1062 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1063 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
1064 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1065 unsigned Rm = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
1066 unsigned ShImm = ARM_AM::getAM2Offset(MO2.getImm());
1067 bool isAdd = ARM_AM::getAM2Op(MO2.getImm()) == ARM_AM::add;
1068 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(MO2.getImm());
1069 unsigned SBits = getShiftOp(ShOp);
1071 // While "lsr #32" and "asr #32" exist, they are encoded with a 0 in the shift
1072 // amount. However, it would be an easy mistake to make so check here.
1073 assert((ShImm & ~0x1f) == 0 && "Out of range shift amount");
1082 uint32_t Binary = Rm;
1084 Binary |= SBits << 5;
1085 Binary |= ShImm << 7;
1091 uint32_t ARMMCCodeEmitter::
1092 getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
1093 SmallVectorImpl<MCFixup> &Fixups,
1094 const MCSubtargetInfo &STI) const {
1096 // {13} 1 == imm12, 0 == Rm
1099 const MCOperand &MO = MI.getOperand(OpIdx);
1100 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1101 uint32_t Binary = getAddrMode2OffsetOpValue(MI, OpIdx + 1, Fixups, STI);
1106 uint32_t ARMMCCodeEmitter::
1107 getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
1108 SmallVectorImpl<MCFixup> &Fixups,
1109 const MCSubtargetInfo &STI) const {
1110 // {13} 1 == imm12, 0 == Rm
1113 const MCOperand &MO = MI.getOperand(OpIdx);
1114 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1115 unsigned Imm = MO1.getImm();
1116 bool isAdd = ARM_AM::getAM2Op(Imm) == ARM_AM::add;
1117 bool isReg = MO.getReg() != 0;
1118 uint32_t Binary = ARM_AM::getAM2Offset(Imm);
1119 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm12
1121 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(Imm);
1122 Binary <<= 7; // Shift amount is bits [11:7]
1123 Binary |= getShiftOp(ShOp) << 5; // Shift type is bits [6:5]
1124 Binary |= CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); // Rm is bits [3:0]
1126 return Binary | (isAdd << 12) | (isReg << 13);
1129 uint32_t ARMMCCodeEmitter::
1130 getPostIdxRegOpValue(const MCInst &MI, unsigned OpIdx,
1131 SmallVectorImpl<MCFixup> &Fixups,
1132 const MCSubtargetInfo &STI) const {
1135 const MCOperand &MO = MI.getOperand(OpIdx);
1136 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1137 bool isAdd = MO1.getImm() != 0;
1138 return CTX.getRegisterInfo()->getEncodingValue(MO.getReg()) | (isAdd << 4);
1141 uint32_t ARMMCCodeEmitter::
1142 getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
1143 SmallVectorImpl<MCFixup> &Fixups,
1144 const MCSubtargetInfo &STI) const {
1145 // {9} 1 == imm8, 0 == Rm
1147 // {7-4} imm7_4/zero
1149 const MCOperand &MO = MI.getOperand(OpIdx);
1150 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1151 unsigned Imm = MO1.getImm();
1152 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
1153 bool isImm = MO.getReg() == 0;
1154 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
1155 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
1157 Imm8 = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1158 return Imm8 | (isAdd << 8) | (isImm << 9);
1161 uint32_t ARMMCCodeEmitter::
1162 getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
1163 SmallVectorImpl<MCFixup> &Fixups,
1164 const MCSubtargetInfo &STI) const {
1165 // {13} 1 == imm8, 0 == Rm
1168 // {7-4} imm7_4/zero
1170 const MCOperand &MO = MI.getOperand(OpIdx);
1171 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1172 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
1174 // If The first operand isn't a register, we have a label reference.
1176 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
1178 assert(MO.isExpr() && "Unexpected machine operand type!");
1179 const MCExpr *Expr = MO.getExpr();
1180 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_10_unscaled);
1181 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
1183 ++MCNumCPRelocations;
1184 return (Rn << 9) | (1 << 13);
1186 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1187 unsigned Imm = MO2.getImm();
1188 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
1189 bool isImm = MO1.getReg() == 0;
1190 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
1191 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
1193 Imm8 = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
1194 return (Rn << 9) | Imm8 | (isAdd << 8) | (isImm << 13);
1197 /// getAddrModeThumbSPOpValue - Encode the t_addrmode_sp operands.
1198 uint32_t ARMMCCodeEmitter::
1199 getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx,
1200 SmallVectorImpl<MCFixup> &Fixups,
1201 const MCSubtargetInfo &STI) const {
1204 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1205 assert(MI.getOperand(OpIdx).getReg() == ARM::SP &&
1206 "Unexpected base register!");
1208 // The immediate is already shifted for the implicit zeroes, so no change
1210 return MO1.getImm() & 0xff;
1213 /// getAddrModeISOpValue - Encode the t_addrmode_is# operands.
1214 uint32_t ARMMCCodeEmitter::
1215 getAddrModeISOpValue(const MCInst &MI, unsigned OpIdx,
1216 SmallVectorImpl<MCFixup> &Fixups,
1217 const MCSubtargetInfo &STI) const {
1221 const MCOperand &MO = MI.getOperand(OpIdx);
1222 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1223 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1224 unsigned Imm5 = MO1.getImm();
1225 return ((Imm5 & 0x1f) << 3) | Rn;
1228 /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands.
1229 uint32_t ARMMCCodeEmitter::
1230 getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx,
1231 SmallVectorImpl<MCFixup> &Fixups,
1232 const MCSubtargetInfo &STI) const {
1233 const MCOperand MO = MI.getOperand(OpIdx);
1235 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cp, Fixups, STI);
1236 return (MO.getImm() >> 2);
1239 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm10' operand.
1240 uint32_t ARMMCCodeEmitter::
1241 getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
1242 SmallVectorImpl<MCFixup> &Fixups,
1243 const MCSubtargetInfo &STI) const {
1245 // {8} = (U)nsigned (add == '1', sub == '0')
1249 // If The first operand isn't a register, we have a label reference.
1250 const MCOperand &MO = MI.getOperand(OpIdx);
1252 Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
1254 isAdd = false; // 'U' bit is handled as part of the fixup.
1256 assert(MO.isExpr() && "Unexpected machine operand type!");
1257 const MCExpr *Expr = MO.getExpr();
1260 Kind = MCFixupKind(ARM::fixup_t2_pcrel_10);
1262 Kind = MCFixupKind(ARM::fixup_arm_pcrel_10);
1263 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
1265 ++MCNumCPRelocations;
1267 EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups, STI);
1268 isAdd = ARM_AM::getAM5Op(Imm8) == ARM_AM::add;
1271 uint32_t Binary = ARM_AM::getAM5Offset(Imm8);
1272 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
1275 Binary |= (Reg << 9);
1279 unsigned ARMMCCodeEmitter::
1280 getSORegRegOpValue(const MCInst &MI, unsigned OpIdx,
1281 SmallVectorImpl<MCFixup> &Fixups,
1282 const MCSubtargetInfo &STI) const {
1283 // Sub-operands are [reg, reg, imm]. The first register is Rm, the reg to be
1284 // shifted. The second is Rs, the amount to shift by, and the third specifies
1285 // the type of the shift.
1293 const MCOperand &MO = MI.getOperand(OpIdx);
1294 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1295 const MCOperand &MO2 = MI.getOperand(OpIdx + 2);
1296 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
1299 unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1301 // Encode the shift opcode.
1303 unsigned Rs = MO1.getReg();
1305 // Set shift operand (bit[7:4]).
1311 default: llvm_unreachable("Unknown shift opc!");
1312 case ARM_AM::lsl: SBits = 0x1; break;
1313 case ARM_AM::lsr: SBits = 0x3; break;
1314 case ARM_AM::asr: SBits = 0x5; break;
1315 case ARM_AM::ror: SBits = 0x7; break;
1319 Binary |= SBits << 4;
1321 // Encode the shift operation Rs.
1322 // Encode Rs bit[11:8].
1323 assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
1324 return Binary | (CTX.getRegisterInfo()->getEncodingValue(Rs) << ARMII::RegRsShift);
1327 unsigned ARMMCCodeEmitter::
1328 getSORegImmOpValue(const MCInst &MI, unsigned OpIdx,
1329 SmallVectorImpl<MCFixup> &Fixups,
1330 const MCSubtargetInfo &STI) const {
1331 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
1332 // shifted. The second is the amount to shift by.
1339 const MCOperand &MO = MI.getOperand(OpIdx);
1340 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1341 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm());
1344 unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1346 // Encode the shift opcode.
1349 // Set shift operand (bit[6:4]).
1354 // RRX - 110 and bit[11:8] clear.
1356 default: llvm_unreachable("Unknown shift opc!");
1357 case ARM_AM::lsl: SBits = 0x0; break;
1358 case ARM_AM::lsr: SBits = 0x2; break;
1359 case ARM_AM::asr: SBits = 0x4; break;
1360 case ARM_AM::ror: SBits = 0x6; break;
1366 // Encode shift_imm bit[11:7].
1367 Binary |= SBits << 4;
1368 unsigned Offset = ARM_AM::getSORegOffset(MO1.getImm());
1369 assert(Offset < 32 && "Offset must be in range 0-31!");
1370 return Binary | (Offset << 7);
1374 unsigned ARMMCCodeEmitter::
1375 getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
1376 SmallVectorImpl<MCFixup> &Fixups,
1377 const MCSubtargetInfo &STI) const {
1378 const MCOperand &MO1 = MI.getOperand(OpNum);
1379 const MCOperand &MO2 = MI.getOperand(OpNum+1);
1380 const MCOperand &MO3 = MI.getOperand(OpNum+2);
1382 // Encoded as [Rn, Rm, imm].
1383 // FIXME: Needs fixup support.
1384 unsigned Value = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
1386 Value |= CTX.getRegisterInfo()->getEncodingValue(MO2.getReg());
1388 Value |= MO3.getImm();
1393 unsigned ARMMCCodeEmitter::
1394 getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
1395 SmallVectorImpl<MCFixup> &Fixups,
1396 const MCSubtargetInfo &STI) const {
1397 const MCOperand &MO1 = MI.getOperand(OpNum);
1398 const MCOperand &MO2 = MI.getOperand(OpNum+1);
1400 // FIXME: Needs fixup support.
1401 unsigned Value = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
1403 // Even though the immediate is 8 bits long, we need 9 bits in order
1404 // to represent the (inverse of the) sign bit.
1406 int32_t tmp = (int32_t)MO2.getImm();
1410 Value |= 256; // Set the ADD bit
1415 unsigned ARMMCCodeEmitter::
1416 getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
1417 SmallVectorImpl<MCFixup> &Fixups,
1418 const MCSubtargetInfo &STI) const {
1419 const MCOperand &MO1 = MI.getOperand(OpNum);
1421 // FIXME: Needs fixup support.
1423 int32_t tmp = (int32_t)MO1.getImm();
1427 Value |= 256; // Set the ADD bit
1432 unsigned ARMMCCodeEmitter::
1433 getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
1434 SmallVectorImpl<MCFixup> &Fixups,
1435 const MCSubtargetInfo &STI) const {
1436 const MCOperand &MO1 = MI.getOperand(OpNum);
1438 // FIXME: Needs fixup support.
1440 int32_t tmp = (int32_t)MO1.getImm();
1444 Value |= 4096; // Set the ADD bit
1445 Value |= tmp & 4095;
1449 unsigned ARMMCCodeEmitter::
1450 getT2SORegOpValue(const MCInst &MI, unsigned OpIdx,
1451 SmallVectorImpl<MCFixup> &Fixups,
1452 const MCSubtargetInfo &STI) const {
1453 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
1454 // shifted. The second is the amount to shift by.
1461 const MCOperand &MO = MI.getOperand(OpIdx);
1462 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1463 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm());
1466 unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1468 // Encode the shift opcode.
1470 // Set shift operand (bit[6:4]).
1476 default: llvm_unreachable("Unknown shift opc!");
1477 case ARM_AM::lsl: SBits = 0x0; break;
1478 case ARM_AM::lsr: SBits = 0x2; break;
1479 case ARM_AM::asr: SBits = 0x4; break;
1480 case ARM_AM::rrx: // FALLTHROUGH
1481 case ARM_AM::ror: SBits = 0x6; break;
1484 Binary |= SBits << 4;
1485 if (SOpc == ARM_AM::rrx)
1488 // Encode shift_imm bit[11:7].
1489 return Binary | ARM_AM::getSORegOffset(MO1.getImm()) << 7;
1492 unsigned ARMMCCodeEmitter::
1493 getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
1494 SmallVectorImpl<MCFixup> &Fixups,
1495 const MCSubtargetInfo &STI) const {
1496 // 10 bits. lower 5 bits are are the lsb of the mask, high five bits are the
1498 const MCOperand &MO = MI.getOperand(Op);
1499 uint32_t v = ~MO.getImm();
1500 uint32_t lsb = countTrailingZeros(v);
1501 uint32_t msb = (32 - countLeadingZeros (v)) - 1;
1502 assert (v != 0 && lsb < 32 && msb < 32 && "Illegal bitfield mask!");
1503 return lsb | (msb << 5);
1506 unsigned ARMMCCodeEmitter::
1507 getRegisterListOpValue(const MCInst &MI, unsigned Op,
1508 SmallVectorImpl<MCFixup> &Fixups,
1509 const MCSubtargetInfo &STI) const {
1512 // {7-0} = Number of registers
1515 // {15-0} = Bitfield of GPRs.
1516 unsigned Reg = MI.getOperand(Op).getReg();
1517 bool SPRRegs = ARMMCRegisterClasses[ARM::SPRRegClassID].contains(Reg);
1518 bool DPRRegs = ARMMCRegisterClasses[ARM::DPRRegClassID].contains(Reg);
1520 unsigned Binary = 0;
1522 if (SPRRegs || DPRRegs) {
1524 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg);
1525 unsigned NumRegs = (MI.getNumOperands() - Op) & 0xff;
1526 Binary |= (RegNo & 0x1f) << 8;
1530 Binary |= NumRegs * 2;
1532 for (unsigned I = Op, E = MI.getNumOperands(); I < E; ++I) {
1533 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(MI.getOperand(I).getReg());
1534 Binary |= 1 << RegNo;
1541 /// getAddrMode6AddressOpValue - Encode an addrmode6 register number along
1542 /// with the alignment operand.
1543 unsigned ARMMCCodeEmitter::
1544 getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
1545 SmallVectorImpl<MCFixup> &Fixups,
1546 const MCSubtargetInfo &STI) const {
1547 const MCOperand &Reg = MI.getOperand(Op);
1548 const MCOperand &Imm = MI.getOperand(Op + 1);
1550 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg());
1553 switch (Imm.getImm()) {
1557 case 8: Align = 0x01; break;
1558 case 16: Align = 0x02; break;
1559 case 32: Align = 0x03; break;
1562 return RegNo | (Align << 4);
1565 /// getAddrMode6OneLane32AddressOpValue - Encode an addrmode6 register number
1566 /// along with the alignment operand for use in VST1 and VLD1 with size 32.
1567 unsigned ARMMCCodeEmitter::
1568 getAddrMode6OneLane32AddressOpValue(const MCInst &MI, unsigned Op,
1569 SmallVectorImpl<MCFixup> &Fixups,
1570 const MCSubtargetInfo &STI) const {
1571 const MCOperand &Reg = MI.getOperand(Op);
1572 const MCOperand &Imm = MI.getOperand(Op + 1);
1574 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg());
1577 switch (Imm.getImm()) {
1581 case 32: // Default '0' value for invalid alignments of 8, 16, 32 bytes.
1582 case 2: Align = 0x00; break;
1583 case 4: Align = 0x03; break;
1586 return RegNo | (Align << 4);
1590 /// getAddrMode6DupAddressOpValue - Encode an addrmode6 register number and
1591 /// alignment operand for use in VLD-dup instructions. This is the same as
1592 /// getAddrMode6AddressOpValue except for the alignment encoding, which is
1593 /// different for VLD4-dup.
1594 unsigned ARMMCCodeEmitter::
1595 getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
1596 SmallVectorImpl<MCFixup> &Fixups,
1597 const MCSubtargetInfo &STI) const {
1598 const MCOperand &Reg = MI.getOperand(Op);
1599 const MCOperand &Imm = MI.getOperand(Op + 1);
1601 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg());
1604 switch (Imm.getImm()) {
1608 case 8: Align = 0x01; break;
1609 case 16: Align = 0x03; break;
1612 return RegNo | (Align << 4);
1615 unsigned ARMMCCodeEmitter::
1616 getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
1617 SmallVectorImpl<MCFixup> &Fixups,
1618 const MCSubtargetInfo &STI) const {
1619 const MCOperand &MO = MI.getOperand(Op);
1620 if (MO.getReg() == 0) return 0x0D;
1621 return CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1624 unsigned ARMMCCodeEmitter::
1625 getShiftRight8Imm(const MCInst &MI, unsigned Op,
1626 SmallVectorImpl<MCFixup> &Fixups,
1627 const MCSubtargetInfo &STI) const {
1628 return 8 - MI.getOperand(Op).getImm();
1631 unsigned ARMMCCodeEmitter::
1632 getShiftRight16Imm(const MCInst &MI, unsigned Op,
1633 SmallVectorImpl<MCFixup> &Fixups,
1634 const MCSubtargetInfo &STI) const {
1635 return 16 - MI.getOperand(Op).getImm();
1638 unsigned ARMMCCodeEmitter::
1639 getShiftRight32Imm(const MCInst &MI, unsigned Op,
1640 SmallVectorImpl<MCFixup> &Fixups,
1641 const MCSubtargetInfo &STI) const {
1642 return 32 - MI.getOperand(Op).getImm();
1645 unsigned ARMMCCodeEmitter::
1646 getShiftRight64Imm(const MCInst &MI, unsigned Op,
1647 SmallVectorImpl<MCFixup> &Fixups,
1648 const MCSubtargetInfo &STI) const {
1649 return 64 - MI.getOperand(Op).getImm();
1652 void ARMMCCodeEmitter::
1653 EncodeInstruction(const MCInst &MI, raw_ostream &OS,
1654 SmallVectorImpl<MCFixup> &Fixups,
1655 const MCSubtargetInfo &STI) const {
1656 // Pseudo instructions don't get encoded.
1657 const MCInstrDesc &Desc = MCII.get(MI.getOpcode());
1658 uint64_t TSFlags = Desc.TSFlags;
1659 if ((TSFlags & ARMII::FormMask) == ARMII::Pseudo)
1663 if (Desc.getSize() == 2 || Desc.getSize() == 4)
1664 Size = Desc.getSize();
1666 llvm_unreachable("Unexpected instruction size!");
1668 uint32_t Binary = getBinaryCodeForInstr(MI, Fixups, STI);
1669 // Thumb 32-bit wide instructions need to emit the high order halfword
1671 if (isThumb(STI) && Size == 4) {
1672 EmitConstant(Binary >> 16, 2, OS);
1673 EmitConstant(Binary & 0xffff, 2, OS);
1675 EmitConstant(Binary, Size, OS);
1676 ++MCNumEmitted; // Keep track of the # of mi's emitted.
1679 #include "ARMGenMCCodeEmitter.inc"