1 //===-- ARMMCTargetDesc.cpp - ARM Target Descriptions ---------------------===//
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 provides ARM specific target descriptions.
12 //===----------------------------------------------------------------------===//
14 #include "ARMBaseInfo.h"
15 #include "ARMMCAsmInfo.h"
16 #include "ARMMCTargetDesc.h"
17 #include "InstPrinter/ARMInstPrinter.h"
18 #include "llvm/ADT/Triple.h"
19 #include "llvm/MC/MCCodeGenInfo.h"
20 #include "llvm/MC/MCELFStreamer.h"
21 #include "llvm/MC/MCInstrAnalysis.h"
22 #include "llvm/MC/MCInstrInfo.h"
23 #include "llvm/MC/MCRegisterInfo.h"
24 #include "llvm/MC/MCStreamer.h"
25 #include "llvm/MC/MCSubtargetInfo.h"
26 #include "llvm/Support/ErrorHandling.h"
27 #include "llvm/Support/TargetRegistry.h"
31 #define GET_REGINFO_MC_DESC
32 #include "ARMGenRegisterInfo.inc"
34 static bool getMCRDeprecationInfo(MCInst &MI, const MCSubtargetInfo &STI,
36 if (STI.getFeatureBits()[llvm::ARM::HasV7Ops] &&
37 (MI.getOperand(0).isImm() && MI.getOperand(0).getImm() == 15) &&
38 (MI.getOperand(1).isImm() && MI.getOperand(1).getImm() == 0) &&
39 // Checks for the deprecated CP15ISB encoding:
40 // mcr p15, #0, rX, c7, c5, #4
41 (MI.getOperand(3).isImm() && MI.getOperand(3).getImm() == 7)) {
42 if ((MI.getOperand(5).isImm() && MI.getOperand(5).getImm() == 4)) {
43 if (MI.getOperand(4).isImm() && MI.getOperand(4).getImm() == 5) {
44 Info = "deprecated since v7, use 'isb'";
48 // Checks for the deprecated CP15DSB encoding:
49 // mcr p15, #0, rX, c7, c10, #4
50 if (MI.getOperand(4).isImm() && MI.getOperand(4).getImm() == 10) {
51 Info = "deprecated since v7, use 'dsb'";
55 // Checks for the deprecated CP15DMB encoding:
56 // mcr p15, #0, rX, c7, c10, #5
57 if (MI.getOperand(4).isImm() && MI.getOperand(4).getImm() == 10 &&
58 (MI.getOperand(5).isImm() && MI.getOperand(5).getImm() == 5)) {
59 Info = "deprecated since v7, use 'dmb'";
66 static bool getITDeprecationInfo(MCInst &MI, const MCSubtargetInfo &STI,
68 if (STI.getFeatureBits()[llvm::ARM::HasV8Ops] && MI.getOperand(1).isImm() &&
69 MI.getOperand(1).getImm() != 8) {
70 Info = "applying IT instruction to more than one subsequent instruction is "
78 static bool getARMStoreDeprecationInfo(MCInst &MI, const MCSubtargetInfo &STI,
80 assert(!STI.getFeatureBits()[llvm::ARM::ModeThumb] &&
81 "cannot predicate thumb instructions");
83 assert(MI.getNumOperands() >= 4 && "expected >= 4 arguments");
84 for (unsigned OI = 4, OE = MI.getNumOperands(); OI < OE; ++OI) {
85 assert(MI.getOperand(OI).isReg() && "expected register");
86 if (MI.getOperand(OI).getReg() == ARM::SP ||
87 MI.getOperand(OI).getReg() == ARM::PC) {
88 Info = "use of SP or PC in the list is deprecated";
95 static bool getARMLoadDeprecationInfo(MCInst &MI, const MCSubtargetInfo &STI,
97 assert(!STI.getFeatureBits()[llvm::ARM::ModeThumb] &&
98 "cannot predicate thumb instructions");
100 assert(MI.getNumOperands() >= 4 && "expected >= 4 arguments");
101 bool ListContainsPC = false, ListContainsLR = false;
102 for (unsigned OI = 4, OE = MI.getNumOperands(); OI < OE; ++OI) {
103 assert(MI.getOperand(OI).isReg() && "expected register");
104 switch (MI.getOperand(OI).getReg()) {
108 ListContainsLR = true;
111 ListContainsPC = true;
114 Info = "use of SP in the list is deprecated";
119 if (ListContainsPC && ListContainsLR) {
120 Info = "use of LR and PC simultaneously in the list is deprecated";
127 #define GET_INSTRINFO_MC_DESC
128 #include "ARMGenInstrInfo.inc"
130 #define GET_SUBTARGETINFO_MC_DESC
131 #include "ARMGenSubtargetInfo.inc"
133 std::string ARM_MC::ParseARMTriple(const Triple &TT, StringRef CPU) {
135 TT.getArch() == Triple::thumb || TT.getArch() == Triple::thumbeb;
137 bool NoCPU = CPU == "generic" || CPU.empty();
138 std::string ARMArchFeature;
139 switch (TT.getSubArch()) {
141 llvm_unreachable("invalid sub-architecture for ARM");
142 case Triple::ARMSubArch_v8:
144 // v8a: FeatureDB, FeatureFPARMv8, FeatureNEON, FeatureDSP,
145 // FeatureMP, FeatureHWDiv, FeatureHWDivARM, FeatureTrustZone,
146 // FeatureT2XtPk, FeatureCrypto, FeatureCRC
147 ARMArchFeature = "+v8,+db,+fp-armv8,+neon,+dsp,+mp,+hwdiv,+hwdiv-arm,"
148 "+trustzone,+t2xtpk,+crypto,+crc";
150 // Use CPU to figure out the exact features
151 ARMArchFeature = "+v8";
153 case Triple::ARMSubArch_v8_1a:
155 // v8.1a: FeatureDB, FeatureFPARMv8, FeatureNEON, FeatureDSP,
156 // FeatureMP, FeatureHWDiv, FeatureHWDivARM, FeatureTrustZone,
157 // FeatureT2XtPk, FeatureCrypto, FeatureCRC, FeatureV8_1a
158 ARMArchFeature = "+v8.1a,+db,+fp-armv8,+neon,+dsp,+mp,+hwdiv,+hwdiv-arm,"
159 "+trustzone,+t2xtpk,+crypto,+crc";
161 // Use CPU to figure out the exact features
162 ARMArchFeature = "+v8.1a";
164 case Triple::ARMSubArch_v7m:
167 // v7m: FeatureNoARM, FeatureDB, FeatureHWDiv, FeatureMClass
168 ARMArchFeature = "+v7,+noarm,+db,+hwdiv,+mclass";
170 // Use CPU to figure out the exact features.
171 ARMArchFeature = "+v7";
173 case Triple::ARMSubArch_v7em:
175 // v7em: FeatureNoARM, FeatureDB, FeatureHWDiv, FeatureDSP,
176 // FeatureT2XtPk, FeatureMClass
177 ARMArchFeature = "+v7,+noarm,+db,+hwdiv,+dsp,+t2xtpk,+mclass";
179 // Use CPU to figure out the exact features.
180 ARMArchFeature = "+v7";
182 case Triple::ARMSubArch_v7s:
184 // v7s: FeatureNEON, FeatureDB, FeatureDSP, FeatureHasRAS
186 ARMArchFeature = "+v7,+swift,+neon,+db,+dsp,+ras";
188 // Use CPU to figure out the exact features.
189 ARMArchFeature = "+v7";
191 case Triple::ARMSubArch_v7k:
193 // v7k: FeatureNEON, FeatureDB, FeatureDSPThumb2, FeatureHasRAS
195 ARMArchFeature = "+v7,+a7,+neon,+db,+t2dsp,+ras";
197 // Use CPU to figure out the exact features.
198 ARMArchFeature = "+v7";
200 case Triple::ARMSubArch_v7:
201 // v7 CPUs have lots of different feature sets. If no CPU is specified,
202 // then assume v7a (e.g. cortex-a8) feature set. Otherwise, return
203 // the "minimum" feature set and use CPU string to figure out the exact
206 // v7a: FeatureNEON, FeatureDB, FeatureDSP, FeatureT2XtPk
207 ARMArchFeature = "+v7,+neon,+db,+dsp,+t2xtpk";
209 // Use CPU to figure out the exact features.
210 ARMArchFeature = "+v7";
212 case Triple::ARMSubArch_v6t2:
213 ARMArchFeature = "+v6t2";
215 case Triple::ARMSubArch_v6k:
216 ARMArchFeature = "+v6k";
218 case Triple::ARMSubArch_v6m:
221 // v6m: FeatureNoARM, FeatureMClass
222 ARMArchFeature = "+v6m,+noarm,+mclass";
224 ARMArchFeature = "+v6";
226 case Triple::ARMSubArch_v6:
227 ARMArchFeature = "+v6";
229 case Triple::ARMSubArch_v5te:
230 ARMArchFeature = "+v5te";
232 case Triple::ARMSubArch_v5:
233 ARMArchFeature = "+v5t";
235 case Triple::ARMSubArch_v4t:
236 ARMArchFeature = "+v4t";
238 case Triple::NoSubArch:
243 if (ARMArchFeature.empty())
244 ARMArchFeature = "+thumb-mode";
246 ARMArchFeature += ",+thumb-mode";
250 if (ARMArchFeature.empty())
251 ARMArchFeature = "+nacl-trap";
253 ARMArchFeature += ",+nacl-trap";
256 return ARMArchFeature;
259 MCSubtargetInfo *ARM_MC::createARMMCSubtargetInfo(const Triple &TT,
260 StringRef CPU, StringRef FS) {
261 std::string ArchFS = ARM_MC::ParseARMTriple(TT, CPU);
264 ArchFS = (Twine(ArchFS) + "," + FS).str();
269 return createARMMCSubtargetInfoImpl(TT, CPU, ArchFS);
272 static MCInstrInfo *createARMMCInstrInfo() {
273 MCInstrInfo *X = new MCInstrInfo();
274 InitARMMCInstrInfo(X);
278 static MCRegisterInfo *createARMMCRegisterInfo(const Triple &Triple) {
279 MCRegisterInfo *X = new MCRegisterInfo();
280 InitARMMCRegisterInfo(X, ARM::LR, 0, 0, ARM::PC);
284 static MCAsmInfo *createARMMCAsmInfo(const MCRegisterInfo &MRI,
285 const Triple &TheTriple) {
287 if (TheTriple.isOSDarwin() || TheTriple.isOSBinFormatMachO())
288 MAI = new ARMMCAsmInfoDarwin(TheTriple);
289 else if (TheTriple.isWindowsMSVCEnvironment())
290 MAI = new ARMCOFFMCAsmInfoMicrosoft();
291 else if (TheTriple.isOSWindows())
292 MAI = new ARMCOFFMCAsmInfoGNU();
294 MAI = new ARMELFMCAsmInfo(TheTriple);
296 unsigned Reg = MRI.getDwarfRegNum(ARM::SP, true);
297 MAI->addInitialFrameState(MCCFIInstruction::createDefCfa(nullptr, Reg, 0));
302 static MCCodeGenInfo *createARMMCCodeGenInfo(const Triple &TT, Reloc::Model RM,
304 CodeGenOpt::Level OL) {
305 MCCodeGenInfo *X = new MCCodeGenInfo();
306 if (RM == Reloc::Default) {
307 // Default relocation model on Darwin is PIC, not DynamicNoPIC.
308 RM = TT.isOSDarwin() ? Reloc::PIC_ : Reloc::DynamicNoPIC;
310 X->initMCCodeGenInfo(RM, CM, OL);
314 static MCStreamer *createELFStreamer(const Triple &T, MCContext &Ctx,
315 MCAsmBackend &MAB, raw_pwrite_stream &OS,
316 MCCodeEmitter *Emitter, bool RelaxAll) {
317 return createARMELFStreamer(Ctx, MAB, OS, Emitter, false,
318 T.getArch() == Triple::thumb);
321 static MCStreamer *createARMMachOStreamer(MCContext &Ctx, MCAsmBackend &MAB,
322 raw_pwrite_stream &OS,
323 MCCodeEmitter *Emitter, bool RelaxAll,
324 bool DWARFMustBeAtTheEnd) {
325 return createMachOStreamer(Ctx, MAB, OS, Emitter, false, DWARFMustBeAtTheEnd);
328 static MCInstPrinter *createARMMCInstPrinter(const Triple &T,
329 unsigned SyntaxVariant,
330 const MCAsmInfo &MAI,
331 const MCInstrInfo &MII,
332 const MCRegisterInfo &MRI) {
333 if (SyntaxVariant == 0)
334 return new ARMInstPrinter(MAI, MII, MRI);
338 static MCRelocationInfo *createARMMCRelocationInfo(const Triple &TT,
340 if (TT.isOSBinFormatMachO())
341 return createARMMachORelocationInfo(Ctx);
342 // Default to the stock relocation info.
343 return llvm::createMCRelocationInfo(TT, Ctx);
348 class ARMMCInstrAnalysis : public MCInstrAnalysis {
350 ARMMCInstrAnalysis(const MCInstrInfo *Info) : MCInstrAnalysis(Info) {}
352 bool isUnconditionalBranch(const MCInst &Inst) const override {
353 // BCCs with the "always" predicate are unconditional branches.
354 if (Inst.getOpcode() == ARM::Bcc && Inst.getOperand(1).getImm()==ARMCC::AL)
356 return MCInstrAnalysis::isUnconditionalBranch(Inst);
359 bool isConditionalBranch(const MCInst &Inst) const override {
360 // BCCs with the "always" predicate are unconditional branches.
361 if (Inst.getOpcode() == ARM::Bcc && Inst.getOperand(1).getImm()==ARMCC::AL)
363 return MCInstrAnalysis::isConditionalBranch(Inst);
366 bool evaluateBranch(const MCInst &Inst, uint64_t Addr,
367 uint64_t Size, uint64_t &Target) const override {
368 // We only handle PCRel branches for now.
369 if (Info->get(Inst.getOpcode()).OpInfo[0].OperandType!=MCOI::OPERAND_PCREL)
372 int64_t Imm = Inst.getOperand(0).getImm();
373 // FIXME: This is not right for thumb.
374 Target = Addr+Imm+8; // In ARM mode the PC is always off by 8 bytes.
381 static MCInstrAnalysis *createARMMCInstrAnalysis(const MCInstrInfo *Info) {
382 return new ARMMCInstrAnalysis(Info);
385 // Force static initialization.
386 extern "C" void LLVMInitializeARMTargetMC() {
387 for (Target *T : {&TheARMLETarget, &TheARMBETarget, &TheThumbLETarget,
388 &TheThumbBETarget}) {
389 // Register the MC asm info.
390 RegisterMCAsmInfoFn X(*T, createARMMCAsmInfo);
392 // Register the MC codegen info.
393 TargetRegistry::RegisterMCCodeGenInfo(*T, createARMMCCodeGenInfo);
395 // Register the MC instruction info.
396 TargetRegistry::RegisterMCInstrInfo(*T, createARMMCInstrInfo);
398 // Register the MC register info.
399 TargetRegistry::RegisterMCRegInfo(*T, createARMMCRegisterInfo);
401 // Register the MC subtarget info.
402 TargetRegistry::RegisterMCSubtargetInfo(*T,
403 ARM_MC::createARMMCSubtargetInfo);
405 // Register the MC instruction analyzer.
406 TargetRegistry::RegisterMCInstrAnalysis(*T, createARMMCInstrAnalysis);
408 TargetRegistry::RegisterELFStreamer(*T, createELFStreamer);
409 TargetRegistry::RegisterCOFFStreamer(*T, createARMWinCOFFStreamer);
410 TargetRegistry::RegisterMachOStreamer(*T, createARMMachOStreamer);
412 // Register the obj target streamer.
413 TargetRegistry::RegisterObjectTargetStreamer(*T,
414 createARMObjectTargetStreamer);
416 // Register the asm streamer.
417 TargetRegistry::RegisterAsmTargetStreamer(*T, createARMTargetAsmStreamer);
419 // Register the null TargetStreamer.
420 TargetRegistry::RegisterNullTargetStreamer(*T, createARMNullTargetStreamer);
422 // Register the MCInstPrinter.
423 TargetRegistry::RegisterMCInstPrinter(*T, createARMMCInstPrinter);
425 // Register the MC relocation info.
426 TargetRegistry::RegisterMCRelocationInfo(*T, createARMMCRelocationInfo);
429 // Register the MC Code Emitter
430 for (Target *T : {&TheARMLETarget, &TheThumbLETarget})
431 TargetRegistry::RegisterMCCodeEmitter(*T, createARMLEMCCodeEmitter);
432 for (Target *T : {&TheARMBETarget, &TheThumbBETarget})
433 TargetRegistry::RegisterMCCodeEmitter(*T, createARMBEMCCodeEmitter);
435 // Register the asm backend.
436 TargetRegistry::RegisterMCAsmBackend(TheARMLETarget, createARMLEAsmBackend);
437 TargetRegistry::RegisterMCAsmBackend(TheARMBETarget, createARMBEAsmBackend);
438 TargetRegistry::RegisterMCAsmBackend(TheThumbLETarget,
439 createThumbLEAsmBackend);
440 TargetRegistry::RegisterMCAsmBackend(TheThumbBETarget,
441 createThumbBEAsmBackend);