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/raw_ostream.h"
33 STATISTIC(MCNumEmitted, "Number of MC instructions emitted.");
34 STATISTIC(MCNumCPRelocations, "Number of constant pool relocations created.");
37 class ARMMCCodeEmitter : public MCCodeEmitter {
38 ARMMCCodeEmitter(const ARMMCCodeEmitter &) LLVM_DELETED_FUNCTION;
39 void operator=(const ARMMCCodeEmitter &) LLVM_DELETED_FUNCTION;
40 const MCInstrInfo &MCII;
41 const MCSubtargetInfo &STI;
45 ARMMCCodeEmitter(const MCInstrInfo &mcii, const MCSubtargetInfo &sti,
47 : MCII(mcii), STI(sti), CTX(ctx) {
50 ~ARMMCCodeEmitter() {}
52 bool isThumb() const {
53 // FIXME: Can tablegen auto-generate this?
54 return (STI.getFeatureBits() & ARM::ModeThumb) != 0;
56 bool isThumb2() const {
57 return isThumb() && (STI.getFeatureBits() & ARM::FeatureThumb2) != 0;
59 bool isTargetDarwin() const {
60 Triple TT(STI.getTargetTriple());
61 Triple::OSType OS = TT.getOS();
62 return OS == Triple::Darwin || OS == Triple::MacOSX || OS == Triple::IOS;
65 unsigned getMachineSoImmOpValue(unsigned SoImm) const;
67 // getBinaryCodeForInstr - TableGen'erated function for getting the
68 // binary encoding for an instruction.
69 uint64_t getBinaryCodeForInstr(const MCInst &MI,
70 SmallVectorImpl<MCFixup> &Fixups) const;
72 /// getMachineOpValue - Return binary encoding of operand. If the machine
73 /// operand requires relocation, record the relocation and return zero.
74 unsigned getMachineOpValue(const MCInst &MI,const MCOperand &MO,
75 SmallVectorImpl<MCFixup> &Fixups) const;
77 /// getHiLo16ImmOpValue - Return the encoding for the hi / low 16-bit of
78 /// the specified operand. This is used for operands with :lower16: and
79 /// :upper16: prefixes.
80 uint32_t getHiLo16ImmOpValue(const MCInst &MI, unsigned OpIdx,
81 SmallVectorImpl<MCFixup> &Fixups) const;
83 bool EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx,
84 unsigned &Reg, unsigned &Imm,
85 SmallVectorImpl<MCFixup> &Fixups) const;
87 /// getThumbBLTargetOpValue - Return encoding info for Thumb immediate
89 uint32_t getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
90 SmallVectorImpl<MCFixup> &Fixups) const;
92 /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate
93 /// BLX branch target.
94 uint32_t getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
95 SmallVectorImpl<MCFixup> &Fixups) const;
97 /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target.
98 uint32_t getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx,
99 SmallVectorImpl<MCFixup> &Fixups) const;
101 /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target.
102 uint32_t getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx,
103 SmallVectorImpl<MCFixup> &Fixups) const;
105 /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target.
106 uint32_t getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx,
107 SmallVectorImpl<MCFixup> &Fixups) const;
109 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate
111 uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
112 SmallVectorImpl<MCFixup> &Fixups) const;
114 /// getUnconditionalBranchTargetOpValue - Return encoding info for 24-bit
115 /// immediate Thumb2 direct branch target.
116 uint32_t getUnconditionalBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
117 SmallVectorImpl<MCFixup> &Fixups) const;
119 /// getARMBranchTargetOpValue - Return encoding info for 24-bit immediate
121 uint32_t getARMBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
122 SmallVectorImpl<MCFixup> &Fixups) const;
123 uint32_t getARMBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
124 SmallVectorImpl<MCFixup> &Fixups) const;
125 uint32_t getARMBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
126 SmallVectorImpl<MCFixup> &Fixups) const;
128 /// getAdrLabelOpValue - Return encoding info for 12-bit immediate
129 /// ADR label target.
130 uint32_t getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
131 SmallVectorImpl<MCFixup> &Fixups) const;
132 uint32_t getThumbAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
133 SmallVectorImpl<MCFixup> &Fixups) const;
134 uint32_t getT2AdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
135 SmallVectorImpl<MCFixup> &Fixups) const;
138 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12'
140 uint32_t getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
141 SmallVectorImpl<MCFixup> &Fixups) const;
143 /// getThumbAddrModeRegRegOpValue - Return encoding for 'reg + reg' operand.
144 uint32_t getThumbAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx,
145 SmallVectorImpl<MCFixup> &Fixups)const;
147 /// getT2AddrModeImm8s4OpValue - Return encoding info for 'reg +/- imm8<<2'
149 uint32_t getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
150 SmallVectorImpl<MCFixup> &Fixups) const;
152 /// getT2AddrModeImm0_1020s4OpValue - Return encoding info for 'reg + imm8<<2'
154 uint32_t getT2AddrModeImm0_1020s4OpValue(const MCInst &MI, unsigned OpIdx,
155 SmallVectorImpl<MCFixup> &Fixups) const;
157 /// getT2Imm8s4OpValue - Return encoding info for '+/- imm8<<2'
159 uint32_t getT2Imm8s4OpValue(const MCInst &MI, unsigned OpIdx,
160 SmallVectorImpl<MCFixup> &Fixups) const;
163 /// getLdStSORegOpValue - Return encoding info for 'reg +/- reg shop imm'
164 /// operand as needed by load/store instructions.
165 uint32_t getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
166 SmallVectorImpl<MCFixup> &Fixups) const;
168 /// getLdStmModeOpValue - Return encoding for load/store multiple mode.
169 uint32_t getLdStmModeOpValue(const MCInst &MI, unsigned OpIdx,
170 SmallVectorImpl<MCFixup> &Fixups) const {
171 ARM_AM::AMSubMode Mode = (ARM_AM::AMSubMode)MI.getOperand(OpIdx).getImm();
173 default: llvm_unreachable("Unknown addressing sub-mode!");
174 case ARM_AM::da: return 0;
175 case ARM_AM::ia: return 1;
176 case ARM_AM::db: return 2;
177 case ARM_AM::ib: return 3;
180 /// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
182 unsigned getShiftOp(ARM_AM::ShiftOpc ShOpc) const {
184 case ARM_AM::no_shift:
185 case ARM_AM::lsl: return 0;
186 case ARM_AM::lsr: return 1;
187 case ARM_AM::asr: return 2;
189 case ARM_AM::rrx: return 3;
191 llvm_unreachable("Invalid ShiftOpc!");
194 /// getAddrMode2OpValue - Return encoding for addrmode2 operands.
195 uint32_t getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
196 SmallVectorImpl<MCFixup> &Fixups) const;
198 /// getAddrMode2OffsetOpValue - Return encoding for am2offset operands.
199 uint32_t getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
200 SmallVectorImpl<MCFixup> &Fixups) const;
202 /// getPostIdxRegOpValue - Return encoding for postidx_reg operands.
203 uint32_t getPostIdxRegOpValue(const MCInst &MI, unsigned OpIdx,
204 SmallVectorImpl<MCFixup> &Fixups) const;
206 /// getAddrMode3OffsetOpValue - Return encoding for am3offset operands.
207 uint32_t getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
208 SmallVectorImpl<MCFixup> &Fixups) const;
210 /// getAddrMode3OpValue - Return encoding for addrmode3 operands.
211 uint32_t getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
212 SmallVectorImpl<MCFixup> &Fixups) const;
214 /// getAddrModeThumbSPOpValue - Return encoding info for 'reg +/- imm12'
216 uint32_t getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx,
217 SmallVectorImpl<MCFixup> &Fixups) const;
219 /// getAddrModeISOpValue - Encode the t_addrmode_is# operands.
220 uint32_t getAddrModeISOpValue(const MCInst &MI, unsigned OpIdx,
221 SmallVectorImpl<MCFixup> &Fixups) const;
223 /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands.
224 uint32_t getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx,
225 SmallVectorImpl<MCFixup> &Fixups) const;
227 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm8' operand.
228 uint32_t getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
229 SmallVectorImpl<MCFixup> &Fixups) const;
231 /// getCCOutOpValue - Return encoding of the 's' bit.
232 unsigned getCCOutOpValue(const MCInst &MI, unsigned Op,
233 SmallVectorImpl<MCFixup> &Fixups) const {
234 // The operand is either reg0 or CPSR. The 's' bit is encoded as '0' or
236 return MI.getOperand(Op).getReg() == ARM::CPSR;
239 /// getSOImmOpValue - Return an encoded 12-bit shifted-immediate value.
240 unsigned getSOImmOpValue(const MCInst &MI, unsigned Op,
241 SmallVectorImpl<MCFixup> &Fixups) const {
242 unsigned SoImm = MI.getOperand(Op).getImm();
243 int SoImmVal = ARM_AM::getSOImmVal(SoImm);
244 assert(SoImmVal != -1 && "Not a valid so_imm value!");
246 // Encode rotate_imm.
247 unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1)
248 << ARMII::SoRotImmShift;
251 Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal);
255 /// getT2SOImmOpValue - Return an encoded 12-bit shifted-immediate value.
256 unsigned getT2SOImmOpValue(const MCInst &MI, unsigned Op,
257 SmallVectorImpl<MCFixup> &Fixups) const {
258 unsigned SoImm = MI.getOperand(Op).getImm();
259 unsigned Encoded = ARM_AM::getT2SOImmVal(SoImm);
260 assert(Encoded != ~0U && "Not a Thumb2 so_imm value?");
264 unsigned getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
265 SmallVectorImpl<MCFixup> &Fixups) const;
266 unsigned getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
267 SmallVectorImpl<MCFixup> &Fixups) const;
268 unsigned getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
269 SmallVectorImpl<MCFixup> &Fixups) const;
270 unsigned getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
271 SmallVectorImpl<MCFixup> &Fixups) const;
273 /// getSORegOpValue - Return an encoded so_reg shifted register value.
274 unsigned getSORegRegOpValue(const MCInst &MI, unsigned Op,
275 SmallVectorImpl<MCFixup> &Fixups) const;
276 unsigned getSORegImmOpValue(const MCInst &MI, unsigned Op,
277 SmallVectorImpl<MCFixup> &Fixups) const;
278 unsigned getT2SORegOpValue(const MCInst &MI, unsigned Op,
279 SmallVectorImpl<MCFixup> &Fixups) const;
281 unsigned getNEONVcvtImm32OpValue(const MCInst &MI, unsigned Op,
282 SmallVectorImpl<MCFixup> &Fixups) const {
283 return 64 - MI.getOperand(Op).getImm();
286 unsigned getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
287 SmallVectorImpl<MCFixup> &Fixups) const;
289 unsigned getRegisterListOpValue(const MCInst &MI, unsigned Op,
290 SmallVectorImpl<MCFixup> &Fixups) const;
291 unsigned getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
292 SmallVectorImpl<MCFixup> &Fixups) const;
293 unsigned getAddrMode6OneLane32AddressOpValue(const MCInst &MI, unsigned Op,
294 SmallVectorImpl<MCFixup> &Fixups) const;
295 unsigned getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
296 SmallVectorImpl<MCFixup> &Fixups) const;
297 unsigned getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
298 SmallVectorImpl<MCFixup> &Fixups) const;
300 unsigned getShiftRight8Imm(const MCInst &MI, unsigned Op,
301 SmallVectorImpl<MCFixup> &Fixups) const;
302 unsigned getShiftRight16Imm(const MCInst &MI, unsigned Op,
303 SmallVectorImpl<MCFixup> &Fixups) const;
304 unsigned getShiftRight32Imm(const MCInst &MI, unsigned Op,
305 SmallVectorImpl<MCFixup> &Fixups) const;
306 unsigned getShiftRight64Imm(const MCInst &MI, unsigned Op,
307 SmallVectorImpl<MCFixup> &Fixups) const;
309 unsigned getThumbSRImmOpValue(const MCInst &MI, unsigned Op,
310 SmallVectorImpl<MCFixup> &Fixups) const;
312 unsigned NEONThumb2DataIPostEncoder(const MCInst &MI,
313 unsigned EncodedValue) const;
314 unsigned NEONThumb2LoadStorePostEncoder(const MCInst &MI,
315 unsigned EncodedValue) const;
316 unsigned NEONThumb2DupPostEncoder(const MCInst &MI,
317 unsigned EncodedValue) const;
318 unsigned NEONThumb2V8PostEncoder(const MCInst &MI,
319 unsigned EncodedValue) const;
321 unsigned VFPThumb2PostEncoder(const MCInst &MI,
322 unsigned EncodedValue) const;
324 void EmitByte(unsigned char C, raw_ostream &OS) const {
328 void EmitConstant(uint64_t Val, unsigned Size, raw_ostream &OS) const {
329 // Output the constant in little endian byte order.
330 for (unsigned i = 0; i != Size; ++i) {
331 EmitByte(Val & 255, OS);
336 void EncodeInstruction(const MCInst &MI, raw_ostream &OS,
337 SmallVectorImpl<MCFixup> &Fixups) const;
340 } // end anonymous namespace
342 MCCodeEmitter *llvm::createARMMCCodeEmitter(const MCInstrInfo &MCII,
343 const MCRegisterInfo &MRI,
344 const MCSubtargetInfo &STI,
346 return new ARMMCCodeEmitter(MCII, STI, Ctx);
349 /// NEONThumb2DataIPostEncoder - Post-process encoded NEON data-processing
350 /// instructions, and rewrite them to their Thumb2 form if we are currently in
352 unsigned ARMMCCodeEmitter::NEONThumb2DataIPostEncoder(const MCInst &MI,
353 unsigned EncodedValue) const {
355 // NEON Thumb2 data-processsing encodings are very simple: bit 24 is moved
356 // to bit 12 of the high half-word (i.e. bit 28), and bits 27-24 are
358 unsigned Bit24 = EncodedValue & 0x01000000;
359 unsigned Bit28 = Bit24 << 4;
360 EncodedValue &= 0xEFFFFFFF;
361 EncodedValue |= Bit28;
362 EncodedValue |= 0x0F000000;
368 /// NEONThumb2LoadStorePostEncoder - Post-process encoded NEON load/store
369 /// instructions, and rewrite them to their Thumb2 form if we are currently in
371 unsigned ARMMCCodeEmitter::NEONThumb2LoadStorePostEncoder(const MCInst &MI,
372 unsigned EncodedValue) const {
374 EncodedValue &= 0xF0FFFFFF;
375 EncodedValue |= 0x09000000;
381 /// NEONThumb2DupPostEncoder - Post-process encoded NEON vdup
382 /// instructions, and rewrite them to their Thumb2 form if we are currently in
384 unsigned ARMMCCodeEmitter::NEONThumb2DupPostEncoder(const MCInst &MI,
385 unsigned EncodedValue) const {
387 EncodedValue &= 0x00FFFFFF;
388 EncodedValue |= 0xEE000000;
394 /// Post-process encoded NEON v8 instructions, and rewrite them to Thumb2 form
395 /// if we are in Thumb2.
396 unsigned ARMMCCodeEmitter::NEONThumb2V8PostEncoder(const MCInst &MI,
397 unsigned EncodedValue) const {
399 EncodedValue |= 0xC000000; // Set bits 27-26
405 /// VFPThumb2PostEncoder - Post-process encoded VFP instructions and rewrite
406 /// them to their Thumb2 form if we are currently in Thumb2 mode.
407 unsigned ARMMCCodeEmitter::
408 VFPThumb2PostEncoder(const MCInst &MI, unsigned EncodedValue) const {
410 EncodedValue &= 0x0FFFFFFF;
411 EncodedValue |= 0xE0000000;
416 /// getMachineOpValue - Return binary encoding of operand. If the machine
417 /// operand requires relocation, record the relocation and return zero.
418 unsigned ARMMCCodeEmitter::
419 getMachineOpValue(const MCInst &MI, const MCOperand &MO,
420 SmallVectorImpl<MCFixup> &Fixups) const {
422 unsigned Reg = MO.getReg();
423 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg);
425 // Q registers are encoded as 2x their register number.
429 case ARM::Q0: case ARM::Q1: case ARM::Q2: case ARM::Q3:
430 case ARM::Q4: case ARM::Q5: case ARM::Q6: case ARM::Q7:
431 case ARM::Q8: case ARM::Q9: case ARM::Q10: case ARM::Q11:
432 case ARM::Q12: case ARM::Q13: case ARM::Q14: case ARM::Q15:
435 } else if (MO.isImm()) {
436 return static_cast<unsigned>(MO.getImm());
437 } else if (MO.isFPImm()) {
438 return static_cast<unsigned>(APFloat(MO.getFPImm())
439 .bitcastToAPInt().getHiBits(32).getLimitedValue());
442 llvm_unreachable("Unable to encode MCOperand!");
445 /// getAddrModeImmOpValue - Return encoding info for 'reg +/- imm' operand.
446 bool ARMMCCodeEmitter::
447 EncodeAddrModeOpValues(const MCInst &MI, unsigned OpIdx, unsigned &Reg,
448 unsigned &Imm, SmallVectorImpl<MCFixup> &Fixups) const {
449 const MCOperand &MO = MI.getOperand(OpIdx);
450 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
452 Reg = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
454 int32_t SImm = MO1.getImm();
457 // Special value for #-0
458 if (SImm == INT32_MIN) {
463 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
473 /// getBranchTargetOpValue - Helper function to get the branch target operand,
474 /// which is either an immediate or requires a fixup.
475 static uint32_t getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
477 SmallVectorImpl<MCFixup> &Fixups) {
478 const MCOperand &MO = MI.getOperand(OpIdx);
480 // If the destination is an immediate, we have nothing to do.
481 if (MO.isImm()) return MO.getImm();
482 assert(MO.isExpr() && "Unexpected branch target type!");
483 const MCExpr *Expr = MO.getExpr();
484 MCFixupKind Kind = MCFixupKind(FixupKind);
485 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
487 // All of the information is in the fixup.
491 // Thumb BL and BLX use a strange offset encoding where bits 22 and 21 are
492 // determined by negating them and XOR'ing them with bit 23.
493 static int32_t encodeThumbBLOffset(int32_t offset) {
495 uint32_t S = (offset & 0x800000) >> 23;
496 uint32_t J1 = (offset & 0x400000) >> 22;
497 uint32_t J2 = (offset & 0x200000) >> 21;
510 /// getThumbBLTargetOpValue - Return encoding info for immediate branch target.
511 uint32_t ARMMCCodeEmitter::
512 getThumbBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
513 SmallVectorImpl<MCFixup> &Fixups) const {
514 const MCOperand MO = MI.getOperand(OpIdx);
516 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bl,
518 return encodeThumbBLOffset(MO.getImm());
521 /// getThumbBLXTargetOpValue - Return encoding info for Thumb immediate
522 /// BLX branch target.
523 uint32_t ARMMCCodeEmitter::
524 getThumbBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
525 SmallVectorImpl<MCFixup> &Fixups) const {
526 const MCOperand MO = MI.getOperand(OpIdx);
528 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_blx,
530 return encodeThumbBLOffset(MO.getImm());
533 /// getThumbBRTargetOpValue - Return encoding info for Thumb branch target.
534 uint32_t ARMMCCodeEmitter::
535 getThumbBRTargetOpValue(const MCInst &MI, unsigned OpIdx,
536 SmallVectorImpl<MCFixup> &Fixups) const {
537 const MCOperand MO = MI.getOperand(OpIdx);
539 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_br,
541 return (MO.getImm() >> 1);
544 /// getThumbBCCTargetOpValue - Return encoding info for Thumb branch target.
545 uint32_t ARMMCCodeEmitter::
546 getThumbBCCTargetOpValue(const MCInst &MI, unsigned OpIdx,
547 SmallVectorImpl<MCFixup> &Fixups) const {
548 const MCOperand MO = MI.getOperand(OpIdx);
550 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_bcc,
552 return (MO.getImm() >> 1);
555 /// getThumbCBTargetOpValue - Return encoding info for Thumb branch target.
556 uint32_t ARMMCCodeEmitter::
557 getThumbCBTargetOpValue(const MCInst &MI, unsigned OpIdx,
558 SmallVectorImpl<MCFixup> &Fixups) const {
559 const MCOperand MO = MI.getOperand(OpIdx);
561 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cb, Fixups);
562 return (MO.getImm() >> 1);
565 /// Return true if this branch has a non-always predication
566 static bool HasConditionalBranch(const MCInst &MI) {
567 int NumOp = MI.getNumOperands();
569 for (int i = 0; i < NumOp-1; ++i) {
570 const MCOperand &MCOp1 = MI.getOperand(i);
571 const MCOperand &MCOp2 = MI.getOperand(i + 1);
572 if (MCOp1.isImm() && MCOp2.isReg() &&
573 (MCOp2.getReg() == 0 || MCOp2.getReg() == ARM::CPSR)) {
574 if (ARMCC::CondCodes(MCOp1.getImm()) != ARMCC::AL)
582 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch
584 uint32_t ARMMCCodeEmitter::
585 getBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
586 SmallVectorImpl<MCFixup> &Fixups) const {
587 // FIXME: This really, really shouldn't use TargetMachine. We don't want
588 // coupling between MC and TM anywhere we can help it.
591 ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_condbranch, Fixups);
592 return getARMBranchTargetOpValue(MI, OpIdx, Fixups);
595 /// getBranchTargetOpValue - Return encoding info for 24-bit immediate branch
597 uint32_t ARMMCCodeEmitter::
598 getARMBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
599 SmallVectorImpl<MCFixup> &Fixups) const {
600 const MCOperand MO = MI.getOperand(OpIdx);
602 if (HasConditionalBranch(MI))
603 return ::getBranchTargetOpValue(MI, OpIdx,
604 ARM::fixup_arm_condbranch, Fixups);
605 return ::getBranchTargetOpValue(MI, OpIdx,
606 ARM::fixup_arm_uncondbranch, Fixups);
609 return MO.getImm() >> 2;
612 uint32_t ARMMCCodeEmitter::
613 getARMBLTargetOpValue(const MCInst &MI, unsigned OpIdx,
614 SmallVectorImpl<MCFixup> &Fixups) const {
615 const MCOperand MO = MI.getOperand(OpIdx);
617 if (HasConditionalBranch(MI))
618 return ::getBranchTargetOpValue(MI, OpIdx,
619 ARM::fixup_arm_condbl, Fixups);
620 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_uncondbl, Fixups);
623 return MO.getImm() >> 2;
626 uint32_t ARMMCCodeEmitter::
627 getARMBLXTargetOpValue(const MCInst &MI, unsigned OpIdx,
628 SmallVectorImpl<MCFixup> &Fixups) const {
629 const MCOperand MO = MI.getOperand(OpIdx);
631 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_blx, Fixups);
633 return MO.getImm() >> 1;
636 /// getUnconditionalBranchTargetOpValue - Return encoding info for 24-bit
637 /// immediate branch target.
638 uint32_t ARMMCCodeEmitter::
639 getUnconditionalBranchTargetOpValue(const MCInst &MI, unsigned OpIdx,
640 SmallVectorImpl<MCFixup> &Fixups) const {
642 ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_uncondbranch, Fixups);
643 bool I = (Val & 0x800000);
644 bool J1 = (Val & 0x400000);
645 bool J2 = (Val & 0x200000);
659 /// getAdrLabelOpValue - Return encoding info for 12-bit shifted-immediate
660 /// ADR label target.
661 uint32_t ARMMCCodeEmitter::
662 getAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
663 SmallVectorImpl<MCFixup> &Fixups) const {
664 const MCOperand MO = MI.getOperand(OpIdx);
666 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_adr_pcrel_12,
668 int32_t offset = MO.getImm();
669 uint32_t Val = 0x2000;
672 if (offset == INT32_MIN) {
675 } else if (offset < 0) {
678 SoImmVal = ARM_AM::getSOImmVal(offset);
682 SoImmVal = ARM_AM::getSOImmVal(offset);
685 SoImmVal = ARM_AM::getSOImmVal(offset);
689 SoImmVal = ARM_AM::getSOImmVal(offset);
693 assert(SoImmVal != -1 && "Not a valid so_imm value!");
699 /// getT2AdrLabelOpValue - Return encoding info for 12-bit immediate ADR label
701 uint32_t ARMMCCodeEmitter::
702 getT2AdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
703 SmallVectorImpl<MCFixup> &Fixups) const {
704 const MCOperand MO = MI.getOperand(OpIdx);
706 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_t2_adr_pcrel_12,
708 int32_t Val = MO.getImm();
709 if (Val == INT32_MIN)
718 /// getThumbAdrLabelOpValue - Return encoding info for 8-bit immediate ADR label
720 uint32_t ARMMCCodeEmitter::
721 getThumbAdrLabelOpValue(const MCInst &MI, unsigned OpIdx,
722 SmallVectorImpl<MCFixup> &Fixups) const {
723 const MCOperand MO = MI.getOperand(OpIdx);
725 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_thumb_adr_pcrel_10,
730 /// getThumbAddrModeRegRegOpValue - Return encoding info for 'reg + reg'
732 uint32_t ARMMCCodeEmitter::
733 getThumbAddrModeRegRegOpValue(const MCInst &MI, unsigned OpIdx,
734 SmallVectorImpl<MCFixup> &) const {
738 const MCOperand &MO1 = MI.getOperand(OpIdx);
739 const MCOperand &MO2 = MI.getOperand(OpIdx + 1);
740 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
741 unsigned Rm = CTX.getRegisterInfo()->getEncodingValue(MO2.getReg());
742 return (Rm << 3) | Rn;
745 /// getAddrModeImm12OpValue - Return encoding info for 'reg +/- imm12' operand.
746 uint32_t ARMMCCodeEmitter::
747 getAddrModeImm12OpValue(const MCInst &MI, unsigned OpIdx,
748 SmallVectorImpl<MCFixup> &Fixups) const {
750 // {12} = (U)nsigned (add == '1', sub == '0')
754 // If The first operand isn't a register, we have a label reference.
755 const MCOperand &MO = MI.getOperand(OpIdx);
757 Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
761 const MCExpr *Expr = MO.getExpr();
762 isAdd = false ; // 'U' bit is set as part of the fixup.
766 Kind = MCFixupKind(ARM::fixup_t2_ldst_pcrel_12);
768 Kind = MCFixupKind(ARM::fixup_arm_ldst_pcrel_12);
769 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
771 ++MCNumCPRelocations;
774 int32_t Offset = MO.getImm();
775 // FIXME: Handle #-0.
783 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm12, Fixups);
785 uint32_t Binary = Imm12 & 0xfff;
786 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
789 Binary |= (Reg << 13);
793 /// getT2Imm8s4OpValue - Return encoding info for
794 /// '+/- imm8<<2' operand.
795 uint32_t ARMMCCodeEmitter::
796 getT2Imm8s4OpValue(const MCInst &MI, unsigned OpIdx,
797 SmallVectorImpl<MCFixup> &Fixups) const {
798 // FIXME: The immediate operand should have already been encoded like this
799 // before ever getting here. The encoder method should just need to combine
800 // the MI operands for the register and the offset into a single
801 // representation for the complex operand in the .td file. This isn't just
802 // style, unfortunately. As-is, we can't represent the distinct encoding
805 // {8} = (U)nsigned (add == '1', sub == '0')
807 int32_t Imm8 = MI.getOperand(OpIdx).getImm();
808 bool isAdd = Imm8 >= 0;
810 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
812 Imm8 = -(uint32_t)Imm8;
817 uint32_t Binary = Imm8 & 0xff;
818 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
824 /// getT2AddrModeImm8s4OpValue - Return encoding info for
825 /// 'reg +/- imm8<<2' operand.
826 uint32_t ARMMCCodeEmitter::
827 getT2AddrModeImm8s4OpValue(const MCInst &MI, unsigned OpIdx,
828 SmallVectorImpl<MCFixup> &Fixups) const {
830 // {8} = (U)nsigned (add == '1', sub == '0')
834 // If The first operand isn't a register, we have a label reference.
835 const MCOperand &MO = MI.getOperand(OpIdx);
837 Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
839 isAdd = false ; // 'U' bit is set as part of the fixup.
841 assert(MO.isExpr() && "Unexpected machine operand type!");
842 const MCExpr *Expr = MO.getExpr();
843 MCFixupKind Kind = MCFixupKind(ARM::fixup_t2_pcrel_10);
844 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
846 ++MCNumCPRelocations;
848 isAdd = EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups);
850 // FIXME: The immediate operand should have already been encoded like this
851 // before ever getting here. The encoder method should just need to combine
852 // the MI operands for the register and the offset into a single
853 // representation for the complex operand in the .td file. This isn't just
854 // style, unfortunately. As-is, we can't represent the distinct encoding
856 uint32_t Binary = (Imm8 >> 2) & 0xff;
857 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
860 Binary |= (Reg << 9);
864 /// getT2AddrModeImm0_1020s4OpValue - Return encoding info for
865 /// 'reg + imm8<<2' operand.
866 uint32_t ARMMCCodeEmitter::
867 getT2AddrModeImm0_1020s4OpValue(const MCInst &MI, unsigned OpIdx,
868 SmallVectorImpl<MCFixup> &Fixups) const {
871 const MCOperand &MO = MI.getOperand(OpIdx);
872 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
873 unsigned Reg = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
874 unsigned Imm8 = MO1.getImm();
875 return (Reg << 8) | Imm8;
878 // FIXME: This routine assumes that a binary
879 // expression will always result in a PCRel expression
880 // In reality, its only true if one or more subexpressions
881 // is itself a PCRel (i.e. "." in asm or some other pcrel construct)
882 // but this is good enough for now.
883 static bool EvaluateAsPCRel(const MCExpr *Expr) {
884 switch (Expr->getKind()) {
885 default: llvm_unreachable("Unexpected expression type");
886 case MCExpr::SymbolRef: return false;
887 case MCExpr::Binary: return true;
892 ARMMCCodeEmitter::getHiLo16ImmOpValue(const MCInst &MI, unsigned OpIdx,
893 SmallVectorImpl<MCFixup> &Fixups) const {
894 // {20-16} = imm{15-12}
895 // {11-0} = imm{11-0}
896 const MCOperand &MO = MI.getOperand(OpIdx);
898 // Hi / lo 16 bits already extracted during earlier passes.
899 return static_cast<unsigned>(MO.getImm());
901 // Handle :upper16: and :lower16: assembly prefixes.
902 const MCExpr *E = MO.getExpr();
904 if (E->getKind() == MCExpr::Target) {
905 const ARMMCExpr *ARM16Expr = cast<ARMMCExpr>(E);
906 E = ARM16Expr->getSubExpr();
908 switch (ARM16Expr->getKind()) {
909 default: llvm_unreachable("Unsupported ARMFixup");
910 case ARMMCExpr::VK_ARM_HI16:
911 if (!isTargetDarwin() && EvaluateAsPCRel(E))
912 Kind = MCFixupKind(isThumb2()
913 ? ARM::fixup_t2_movt_hi16_pcrel
914 : ARM::fixup_arm_movt_hi16_pcrel);
916 Kind = MCFixupKind(isThumb2()
917 ? ARM::fixup_t2_movt_hi16
918 : ARM::fixup_arm_movt_hi16);
920 case ARMMCExpr::VK_ARM_LO16:
921 if (!isTargetDarwin() && EvaluateAsPCRel(E))
922 Kind = MCFixupKind(isThumb2()
923 ? ARM::fixup_t2_movw_lo16_pcrel
924 : ARM::fixup_arm_movw_lo16_pcrel);
926 Kind = MCFixupKind(isThumb2()
927 ? ARM::fixup_t2_movw_lo16
928 : ARM::fixup_arm_movw_lo16);
931 Fixups.push_back(MCFixup::Create(0, E, Kind, MI.getLoc()));
934 // If the expression doesn't have :upper16: or :lower16: on it,
935 // it's just a plain immediate expression, and those evaluate to
936 // the lower 16 bits of the expression regardless of whether
937 // we have a movt or a movw.
938 if (!isTargetDarwin() && EvaluateAsPCRel(E))
939 Kind = MCFixupKind(isThumb2()
940 ? ARM::fixup_t2_movw_lo16_pcrel
941 : ARM::fixup_arm_movw_lo16_pcrel);
943 Kind = MCFixupKind(isThumb2()
944 ? ARM::fixup_t2_movw_lo16
945 : ARM::fixup_arm_movw_lo16);
946 Fixups.push_back(MCFixup::Create(0, E, Kind, MI.getLoc()));
950 uint32_t ARMMCCodeEmitter::
951 getLdStSORegOpValue(const MCInst &MI, unsigned OpIdx,
952 SmallVectorImpl<MCFixup> &Fixups) const {
953 const MCOperand &MO = MI.getOperand(OpIdx);
954 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
955 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
956 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
957 unsigned Rm = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
958 unsigned ShImm = ARM_AM::getAM2Offset(MO2.getImm());
959 bool isAdd = ARM_AM::getAM2Op(MO2.getImm()) == ARM_AM::add;
960 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(MO2.getImm());
961 unsigned SBits = getShiftOp(ShOp);
963 // While "lsr #32" and "asr #32" exist, they are encoded with a 0 in the shift
964 // amount. However, it would be an easy mistake to make so check here.
965 assert((ShImm & ~0x1f) == 0 && "Out of range shift amount");
974 uint32_t Binary = Rm;
976 Binary |= SBits << 5;
977 Binary |= ShImm << 7;
983 uint32_t ARMMCCodeEmitter::
984 getAddrMode2OpValue(const MCInst &MI, unsigned OpIdx,
985 SmallVectorImpl<MCFixup> &Fixups) const {
987 // {13} 1 == imm12, 0 == Rm
990 const MCOperand &MO = MI.getOperand(OpIdx);
991 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
992 uint32_t Binary = getAddrMode2OffsetOpValue(MI, OpIdx + 1, Fixups);
997 uint32_t ARMMCCodeEmitter::
998 getAddrMode2OffsetOpValue(const MCInst &MI, unsigned OpIdx,
999 SmallVectorImpl<MCFixup> &Fixups) const {
1000 // {13} 1 == imm12, 0 == Rm
1003 const MCOperand &MO = MI.getOperand(OpIdx);
1004 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1005 unsigned Imm = MO1.getImm();
1006 bool isAdd = ARM_AM::getAM2Op(Imm) == ARM_AM::add;
1007 bool isReg = MO.getReg() != 0;
1008 uint32_t Binary = ARM_AM::getAM2Offset(Imm);
1009 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm12
1011 ARM_AM::ShiftOpc ShOp = ARM_AM::getAM2ShiftOpc(Imm);
1012 Binary <<= 7; // Shift amount is bits [11:7]
1013 Binary |= getShiftOp(ShOp) << 5; // Shift type is bits [6:5]
1014 Binary |= CTX.getRegisterInfo()->getEncodingValue(MO.getReg()); // Rm is bits [3:0]
1016 return Binary | (isAdd << 12) | (isReg << 13);
1019 uint32_t ARMMCCodeEmitter::
1020 getPostIdxRegOpValue(const MCInst &MI, unsigned OpIdx,
1021 SmallVectorImpl<MCFixup> &Fixups) const {
1024 const MCOperand &MO = MI.getOperand(OpIdx);
1025 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1026 bool isAdd = MO1.getImm() != 0;
1027 return CTX.getRegisterInfo()->getEncodingValue(MO.getReg()) | (isAdd << 4);
1030 uint32_t ARMMCCodeEmitter::
1031 getAddrMode3OffsetOpValue(const MCInst &MI, unsigned OpIdx,
1032 SmallVectorImpl<MCFixup> &Fixups) const {
1033 // {9} 1 == imm8, 0 == Rm
1035 // {7-4} imm7_4/zero
1037 const MCOperand &MO = MI.getOperand(OpIdx);
1038 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1039 unsigned Imm = MO1.getImm();
1040 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
1041 bool isImm = MO.getReg() == 0;
1042 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
1043 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
1045 Imm8 = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1046 return Imm8 | (isAdd << 8) | (isImm << 9);
1049 uint32_t ARMMCCodeEmitter::
1050 getAddrMode3OpValue(const MCInst &MI, unsigned OpIdx,
1051 SmallVectorImpl<MCFixup> &Fixups) const {
1052 // {13} 1 == imm8, 0 == Rm
1055 // {7-4} imm7_4/zero
1057 const MCOperand &MO = MI.getOperand(OpIdx);
1058 const MCOperand &MO1 = MI.getOperand(OpIdx+1);
1059 const MCOperand &MO2 = MI.getOperand(OpIdx+2);
1061 // If The first operand isn't a register, we have a label reference.
1063 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
1065 assert(MO.isExpr() && "Unexpected machine operand type!");
1066 const MCExpr *Expr = MO.getExpr();
1067 MCFixupKind Kind = MCFixupKind(ARM::fixup_arm_pcrel_10_unscaled);
1068 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
1070 ++MCNumCPRelocations;
1071 return (Rn << 9) | (1 << 13);
1073 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1074 unsigned Imm = MO2.getImm();
1075 bool isAdd = ARM_AM::getAM3Op(Imm) == ARM_AM::add;
1076 bool isImm = MO1.getReg() == 0;
1077 uint32_t Imm8 = ARM_AM::getAM3Offset(Imm);
1078 // if reg +/- reg, Rm will be non-zero. Otherwise, we have reg +/- imm8
1080 Imm8 = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
1081 return (Rn << 9) | Imm8 | (isAdd << 8) | (isImm << 13);
1084 /// getAddrModeThumbSPOpValue - Encode the t_addrmode_sp operands.
1085 uint32_t ARMMCCodeEmitter::
1086 getAddrModeThumbSPOpValue(const MCInst &MI, unsigned OpIdx,
1087 SmallVectorImpl<MCFixup> &Fixups) const {
1090 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1091 assert(MI.getOperand(OpIdx).getReg() == ARM::SP &&
1092 "Unexpected base register!");
1094 // The immediate is already shifted for the implicit zeroes, so no change
1096 return MO1.getImm() & 0xff;
1099 /// getAddrModeISOpValue - Encode the t_addrmode_is# operands.
1100 uint32_t ARMMCCodeEmitter::
1101 getAddrModeISOpValue(const MCInst &MI, unsigned OpIdx,
1102 SmallVectorImpl<MCFixup> &Fixups) const {
1106 const MCOperand &MO = MI.getOperand(OpIdx);
1107 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1108 unsigned Rn = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1109 unsigned Imm5 = MO1.getImm();
1110 return ((Imm5 & 0x1f) << 3) | Rn;
1113 /// getAddrModePCOpValue - Return encoding for t_addrmode_pc operands.
1114 uint32_t ARMMCCodeEmitter::
1115 getAddrModePCOpValue(const MCInst &MI, unsigned OpIdx,
1116 SmallVectorImpl<MCFixup> &Fixups) const {
1117 const MCOperand MO = MI.getOperand(OpIdx);
1119 return ::getBranchTargetOpValue(MI, OpIdx, ARM::fixup_arm_thumb_cp, Fixups);
1120 return (MO.getImm() >> 2);
1123 /// getAddrMode5OpValue - Return encoding info for 'reg +/- imm10' operand.
1124 uint32_t ARMMCCodeEmitter::
1125 getAddrMode5OpValue(const MCInst &MI, unsigned OpIdx,
1126 SmallVectorImpl<MCFixup> &Fixups) const {
1128 // {8} = (U)nsigned (add == '1', sub == '0')
1132 // If The first operand isn't a register, we have a label reference.
1133 const MCOperand &MO = MI.getOperand(OpIdx);
1135 Reg = CTX.getRegisterInfo()->getEncodingValue(ARM::PC); // Rn is PC.
1137 isAdd = false; // 'U' bit is handled as part of the fixup.
1139 assert(MO.isExpr() && "Unexpected machine operand type!");
1140 const MCExpr *Expr = MO.getExpr();
1143 Kind = MCFixupKind(ARM::fixup_t2_pcrel_10);
1145 Kind = MCFixupKind(ARM::fixup_arm_pcrel_10);
1146 Fixups.push_back(MCFixup::Create(0, Expr, Kind, MI.getLoc()));
1148 ++MCNumCPRelocations;
1150 EncodeAddrModeOpValues(MI, OpIdx, Reg, Imm8, Fixups);
1151 isAdd = ARM_AM::getAM5Op(Imm8) == ARM_AM::add;
1154 uint32_t Binary = ARM_AM::getAM5Offset(Imm8);
1155 // Immediate is always encoded as positive. The 'U' bit controls add vs sub.
1158 Binary |= (Reg << 9);
1162 unsigned ARMMCCodeEmitter::
1163 getSORegRegOpValue(const MCInst &MI, unsigned OpIdx,
1164 SmallVectorImpl<MCFixup> &Fixups) const {
1165 // Sub-operands are [reg, reg, imm]. The first register is Rm, the reg to be
1166 // shifted. The second is Rs, the amount to shift by, and the third specifies
1167 // the type of the shift.
1175 const MCOperand &MO = MI.getOperand(OpIdx);
1176 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1177 const MCOperand &MO2 = MI.getOperand(OpIdx + 2);
1178 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
1181 unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1183 // Encode the shift opcode.
1185 unsigned Rs = MO1.getReg();
1187 // Set shift operand (bit[7:4]).
1193 default: llvm_unreachable("Unknown shift opc!");
1194 case ARM_AM::lsl: SBits = 0x1; break;
1195 case ARM_AM::lsr: SBits = 0x3; break;
1196 case ARM_AM::asr: SBits = 0x5; break;
1197 case ARM_AM::ror: SBits = 0x7; break;
1201 Binary |= SBits << 4;
1203 // Encode the shift operation Rs.
1204 // Encode Rs bit[11:8].
1205 assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
1206 return Binary | (CTX.getRegisterInfo()->getEncodingValue(Rs) << ARMII::RegRsShift);
1209 unsigned ARMMCCodeEmitter::
1210 getSORegImmOpValue(const MCInst &MI, unsigned OpIdx,
1211 SmallVectorImpl<MCFixup> &Fixups) const {
1212 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
1213 // shifted. The second is the amount to shift by.
1220 const MCOperand &MO = MI.getOperand(OpIdx);
1221 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1222 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm());
1225 unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1227 // Encode the shift opcode.
1230 // Set shift operand (bit[6:4]).
1235 // RRX - 110 and bit[11:8] clear.
1237 default: llvm_unreachable("Unknown shift opc!");
1238 case ARM_AM::lsl: SBits = 0x0; break;
1239 case ARM_AM::lsr: SBits = 0x2; break;
1240 case ARM_AM::asr: SBits = 0x4; break;
1241 case ARM_AM::ror: SBits = 0x6; break;
1247 // Encode shift_imm bit[11:7].
1248 Binary |= SBits << 4;
1249 unsigned Offset = ARM_AM::getSORegOffset(MO1.getImm());
1250 assert(Offset < 32 && "Offset must be in range 0-31!");
1251 return Binary | (Offset << 7);
1255 unsigned ARMMCCodeEmitter::
1256 getT2AddrModeSORegOpValue(const MCInst &MI, unsigned OpNum,
1257 SmallVectorImpl<MCFixup> &Fixups) const {
1258 const MCOperand &MO1 = MI.getOperand(OpNum);
1259 const MCOperand &MO2 = MI.getOperand(OpNum+1);
1260 const MCOperand &MO3 = MI.getOperand(OpNum+2);
1262 // Encoded as [Rn, Rm, imm].
1263 // FIXME: Needs fixup support.
1264 unsigned Value = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
1266 Value |= CTX.getRegisterInfo()->getEncodingValue(MO2.getReg());
1268 Value |= MO3.getImm();
1273 unsigned ARMMCCodeEmitter::
1274 getT2AddrModeImm8OpValue(const MCInst &MI, unsigned OpNum,
1275 SmallVectorImpl<MCFixup> &Fixups) const {
1276 const MCOperand &MO1 = MI.getOperand(OpNum);
1277 const MCOperand &MO2 = MI.getOperand(OpNum+1);
1279 // FIXME: Needs fixup support.
1280 unsigned Value = CTX.getRegisterInfo()->getEncodingValue(MO1.getReg());
1282 // Even though the immediate is 8 bits long, we need 9 bits in order
1283 // to represent the (inverse of the) sign bit.
1285 int32_t tmp = (int32_t)MO2.getImm();
1289 Value |= 256; // Set the ADD bit
1294 unsigned ARMMCCodeEmitter::
1295 getT2AddrModeImm8OffsetOpValue(const MCInst &MI, unsigned OpNum,
1296 SmallVectorImpl<MCFixup> &Fixups) const {
1297 const MCOperand &MO1 = MI.getOperand(OpNum);
1299 // FIXME: Needs fixup support.
1301 int32_t tmp = (int32_t)MO1.getImm();
1305 Value |= 256; // Set the ADD bit
1310 unsigned ARMMCCodeEmitter::
1311 getT2AddrModeImm12OffsetOpValue(const MCInst &MI, unsigned OpNum,
1312 SmallVectorImpl<MCFixup> &Fixups) const {
1313 const MCOperand &MO1 = MI.getOperand(OpNum);
1315 // FIXME: Needs fixup support.
1317 int32_t tmp = (int32_t)MO1.getImm();
1321 Value |= 4096; // Set the ADD bit
1322 Value |= tmp & 4095;
1326 unsigned ARMMCCodeEmitter::
1327 getT2SORegOpValue(const MCInst &MI, unsigned OpIdx,
1328 SmallVectorImpl<MCFixup> &Fixups) const {
1329 // Sub-operands are [reg, imm]. The first register is Rm, the reg to be
1330 // shifted. The second is the amount to shift by.
1337 const MCOperand &MO = MI.getOperand(OpIdx);
1338 const MCOperand &MO1 = MI.getOperand(OpIdx + 1);
1339 ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO1.getImm());
1342 unsigned Binary = CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1344 // Encode the shift opcode.
1346 // Set shift operand (bit[6:4]).
1352 default: llvm_unreachable("Unknown shift opc!");
1353 case ARM_AM::lsl: SBits = 0x0; break;
1354 case ARM_AM::lsr: SBits = 0x2; break;
1355 case ARM_AM::asr: SBits = 0x4; break;
1356 case ARM_AM::rrx: // FALLTHROUGH
1357 case ARM_AM::ror: SBits = 0x6; break;
1360 Binary |= SBits << 4;
1361 if (SOpc == ARM_AM::rrx)
1364 // Encode shift_imm bit[11:7].
1365 return Binary | ARM_AM::getSORegOffset(MO1.getImm()) << 7;
1368 unsigned ARMMCCodeEmitter::
1369 getBitfieldInvertedMaskOpValue(const MCInst &MI, unsigned Op,
1370 SmallVectorImpl<MCFixup> &Fixups) const {
1371 // 10 bits. lower 5 bits are are the lsb of the mask, high five bits are the
1373 const MCOperand &MO = MI.getOperand(Op);
1374 uint32_t v = ~MO.getImm();
1375 uint32_t lsb = countTrailingZeros(v);
1376 uint32_t msb = (32 - countLeadingZeros (v)) - 1;
1377 assert (v != 0 && lsb < 32 && msb < 32 && "Illegal bitfield mask!");
1378 return lsb | (msb << 5);
1381 unsigned ARMMCCodeEmitter::
1382 getRegisterListOpValue(const MCInst &MI, unsigned Op,
1383 SmallVectorImpl<MCFixup> &Fixups) const {
1386 // {7-0} = Number of registers
1389 // {15-0} = Bitfield of GPRs.
1390 unsigned Reg = MI.getOperand(Op).getReg();
1391 bool SPRRegs = ARMMCRegisterClasses[ARM::SPRRegClassID].contains(Reg);
1392 bool DPRRegs = ARMMCRegisterClasses[ARM::DPRRegClassID].contains(Reg);
1394 unsigned Binary = 0;
1396 if (SPRRegs || DPRRegs) {
1398 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg);
1399 unsigned NumRegs = (MI.getNumOperands() - Op) & 0xff;
1400 Binary |= (RegNo & 0x1f) << 8;
1404 Binary |= NumRegs * 2;
1406 for (unsigned I = Op, E = MI.getNumOperands(); I < E; ++I) {
1407 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(MI.getOperand(I).getReg());
1408 Binary |= 1 << RegNo;
1415 /// getAddrMode6AddressOpValue - Encode an addrmode6 register number along
1416 /// with the alignment operand.
1417 unsigned ARMMCCodeEmitter::
1418 getAddrMode6AddressOpValue(const MCInst &MI, unsigned Op,
1419 SmallVectorImpl<MCFixup> &Fixups) const {
1420 const MCOperand &Reg = MI.getOperand(Op);
1421 const MCOperand &Imm = MI.getOperand(Op + 1);
1423 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg());
1426 switch (Imm.getImm()) {
1430 case 8: Align = 0x01; break;
1431 case 16: Align = 0x02; break;
1432 case 32: Align = 0x03; break;
1435 return RegNo | (Align << 4);
1438 /// getAddrMode6OneLane32AddressOpValue - Encode an addrmode6 register number
1439 /// along with the alignment operand for use in VST1 and VLD1 with size 32.
1440 unsigned ARMMCCodeEmitter::
1441 getAddrMode6OneLane32AddressOpValue(const MCInst &MI, unsigned Op,
1442 SmallVectorImpl<MCFixup> &Fixups) const {
1443 const MCOperand &Reg = MI.getOperand(Op);
1444 const MCOperand &Imm = MI.getOperand(Op + 1);
1446 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg());
1449 switch (Imm.getImm()) {
1453 case 32: // Default '0' value for invalid alignments of 8, 16, 32 bytes.
1454 case 2: Align = 0x00; break;
1455 case 4: Align = 0x03; break;
1458 return RegNo | (Align << 4);
1462 /// getAddrMode6DupAddressOpValue - Encode an addrmode6 register number and
1463 /// alignment operand for use in VLD-dup instructions. This is the same as
1464 /// getAddrMode6AddressOpValue except for the alignment encoding, which is
1465 /// different for VLD4-dup.
1466 unsigned ARMMCCodeEmitter::
1467 getAddrMode6DupAddressOpValue(const MCInst &MI, unsigned Op,
1468 SmallVectorImpl<MCFixup> &Fixups) const {
1469 const MCOperand &Reg = MI.getOperand(Op);
1470 const MCOperand &Imm = MI.getOperand(Op + 1);
1472 unsigned RegNo = CTX.getRegisterInfo()->getEncodingValue(Reg.getReg());
1475 switch (Imm.getImm()) {
1479 case 8: Align = 0x01; break;
1480 case 16: Align = 0x03; break;
1483 return RegNo | (Align << 4);
1486 unsigned ARMMCCodeEmitter::
1487 getAddrMode6OffsetOpValue(const MCInst &MI, unsigned Op,
1488 SmallVectorImpl<MCFixup> &Fixups) const {
1489 const MCOperand &MO = MI.getOperand(Op);
1490 if (MO.getReg() == 0) return 0x0D;
1491 return CTX.getRegisterInfo()->getEncodingValue(MO.getReg());
1494 unsigned ARMMCCodeEmitter::
1495 getShiftRight8Imm(const MCInst &MI, unsigned Op,
1496 SmallVectorImpl<MCFixup> &Fixups) const {
1497 return 8 - MI.getOperand(Op).getImm();
1500 unsigned ARMMCCodeEmitter::
1501 getShiftRight16Imm(const MCInst &MI, unsigned Op,
1502 SmallVectorImpl<MCFixup> &Fixups) const {
1503 return 16 - MI.getOperand(Op).getImm();
1506 unsigned ARMMCCodeEmitter::
1507 getShiftRight32Imm(const MCInst &MI, unsigned Op,
1508 SmallVectorImpl<MCFixup> &Fixups) const {
1509 return 32 - MI.getOperand(Op).getImm();
1512 unsigned ARMMCCodeEmitter::
1513 getShiftRight64Imm(const MCInst &MI, unsigned Op,
1514 SmallVectorImpl<MCFixup> &Fixups) const {
1515 return 64 - MI.getOperand(Op).getImm();
1518 void ARMMCCodeEmitter::
1519 EncodeInstruction(const MCInst &MI, raw_ostream &OS,
1520 SmallVectorImpl<MCFixup> &Fixups) const {
1521 // Pseudo instructions don't get encoded.
1522 const MCInstrDesc &Desc = MCII.get(MI.getOpcode());
1523 uint64_t TSFlags = Desc.TSFlags;
1524 if ((TSFlags & ARMII::FormMask) == ARMII::Pseudo)
1528 if (Desc.getSize() == 2 || Desc.getSize() == 4)
1529 Size = Desc.getSize();
1531 llvm_unreachable("Unexpected instruction size!");
1533 uint32_t Binary = getBinaryCodeForInstr(MI, Fixups);
1534 // Thumb 32-bit wide instructions need to emit the high order halfword
1536 if (isThumb() && Size == 4) {
1537 EmitConstant(Binary >> 16, 2, OS);
1538 EmitConstant(Binary & 0xffff, 2, OS);
1540 EmitConstant(Binary, Size, OS);
1541 ++MCNumEmitted; // Keep track of the # of mi's emitted.
1544 #include "ARMGenMCCodeEmitter.inc"