1 //===--- Mips.cpp - Tools Implementations -----------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "Mips.h" 10 #include "ToolChains/CommonArgs.h" 11 #include "clang/Driver/Driver.h" 12 #include "clang/Driver/DriverDiagnostic.h" 13 #include "clang/Driver/Options.h" 14 #include "llvm/ADT/StringSwitch.h" 15 #include "llvm/Option/ArgList.h" 16 17 using namespace clang::driver; 18 using namespace clang::driver::tools; 19 using namespace clang; 20 using namespace llvm::opt; 21 22 // Get CPU and ABI names. They are not independent 23 // so we have to calculate them together. 24 void mips::getMipsCPUAndABI(const ArgList &Args, const llvm::Triple &Triple, 25 StringRef &CPUName, StringRef &ABIName) { 26 const char *DefMips32CPU = "mips32r2"; 27 const char *DefMips64CPU = "mips64r2"; 28 29 // MIPS32r6 is the default for mips(el)?-img-linux-gnu and MIPS64r6 is the 30 // default for mips64(el)?-img-linux-gnu. 31 if (Triple.getVendor() == llvm::Triple::ImaginationTechnologies && 32 Triple.isGNUEnvironment()) { 33 DefMips32CPU = "mips32r6"; 34 DefMips64CPU = "mips64r6"; 35 } 36 37 if (Triple.getSubArch() == llvm::Triple::MipsSubArch_r6) { 38 DefMips32CPU = "mips32r6"; 39 DefMips64CPU = "mips64r6"; 40 } 41 42 // MIPS64r6 is the default for Android MIPS64 (mips64el-linux-android). 43 if (Triple.isAndroid()) { 44 DefMips32CPU = "mips32"; 45 DefMips64CPU = "mips64r6"; 46 } 47 48 // MIPS3 is the default for mips64*-unknown-openbsd. 49 if (Triple.isOSOpenBSD()) 50 DefMips64CPU = "mips3"; 51 52 // MIPS2 is the default for mips(el)?-unknown-freebsd. 53 // MIPS3 is the default for mips64(el)?-unknown-freebsd. 54 if (Triple.isOSFreeBSD()) { 55 DefMips32CPU = "mips2"; 56 DefMips64CPU = "mips3"; 57 } 58 59 if (Arg *A = Args.getLastArg(clang::driver::options::OPT_march_EQ, 60 options::OPT_mcpu_EQ)) 61 CPUName = A->getValue(); 62 63 if (Arg *A = Args.getLastArg(options::OPT_mabi_EQ)) { 64 ABIName = A->getValue(); 65 // Convert a GNU style Mips ABI name to the name 66 // accepted by LLVM Mips backend. 67 ABIName = llvm::StringSwitch<llvm::StringRef>(ABIName) 68 .Case("32", "o32") 69 .Case("64", "n64") 70 .Default(ABIName); 71 } 72 73 // Setup default CPU and ABI names. 74 if (CPUName.empty() && ABIName.empty()) { 75 switch (Triple.getArch()) { 76 default: 77 llvm_unreachable("Unexpected triple arch name"); 78 case llvm::Triple::mips: 79 case llvm::Triple::mipsel: 80 CPUName = DefMips32CPU; 81 break; 82 case llvm::Triple::mips64: 83 case llvm::Triple::mips64el: 84 CPUName = DefMips64CPU; 85 break; 86 } 87 } 88 89 if (ABIName.empty() && (Triple.getEnvironment() == llvm::Triple::GNUABIN32)) 90 ABIName = "n32"; 91 92 if (ABIName.empty() && 93 (Triple.getVendor() == llvm::Triple::MipsTechnologies || 94 Triple.getVendor() == llvm::Triple::ImaginationTechnologies)) { 95 ABIName = llvm::StringSwitch<const char *>(CPUName) 96 .Case("mips1", "o32") 97 .Case("mips2", "o32") 98 .Case("mips3", "n64") 99 .Case("mips4", "n64") 100 .Case("mips5", "n64") 101 .Case("mips32", "o32") 102 .Case("mips32r2", "o32") 103 .Case("mips32r3", "o32") 104 .Case("mips32r5", "o32") 105 .Case("mips32r6", "o32") 106 .Case("mips64", "n64") 107 .Case("mips64r2", "n64") 108 .Case("mips64r3", "n64") 109 .Case("mips64r5", "n64") 110 .Case("mips64r6", "n64") 111 .Case("octeon", "n64") 112 .Case("p5600", "o32") 113 .Default(""); 114 } 115 116 if (ABIName.empty()) { 117 // Deduce ABI name from the target triple. 118 ABIName = Triple.isMIPS32() ? "o32" : "n64"; 119 } 120 121 if (CPUName.empty()) { 122 // Deduce CPU name from ABI name. 123 CPUName = llvm::StringSwitch<const char *>(ABIName) 124 .Case("o32", DefMips32CPU) 125 .Cases("n32", "n64", DefMips64CPU) 126 .Default(""); 127 } 128 129 // FIXME: Warn on inconsistent use of -march and -mabi. 130 } 131 132 std::string mips::getMipsABILibSuffix(const ArgList &Args, 133 const llvm::Triple &Triple) { 134 StringRef CPUName, ABIName; 135 tools::mips::getMipsCPUAndABI(Args, Triple, CPUName, ABIName); 136 return llvm::StringSwitch<std::string>(ABIName) 137 .Case("o32", "") 138 .Case("n32", "32") 139 .Case("n64", "64"); 140 } 141 142 // Convert ABI name to the GNU tools acceptable variant. 143 StringRef mips::getGnuCompatibleMipsABIName(StringRef ABI) { 144 return llvm::StringSwitch<llvm::StringRef>(ABI) 145 .Case("o32", "32") 146 .Case("n64", "64") 147 .Default(ABI); 148 } 149 150 // Select the MIPS float ABI as determined by -msoft-float, -mhard-float, 151 // and -mfloat-abi=. 152 mips::FloatABI mips::getMipsFloatABI(const Driver &D, const ArgList &Args, 153 const llvm::Triple &Triple) { 154 mips::FloatABI ABI = mips::FloatABI::Invalid; 155 if (Arg *A = 156 Args.getLastArg(options::OPT_msoft_float, options::OPT_mhard_float, 157 options::OPT_mfloat_abi_EQ)) { 158 if (A->getOption().matches(options::OPT_msoft_float)) 159 ABI = mips::FloatABI::Soft; 160 else if (A->getOption().matches(options::OPT_mhard_float)) 161 ABI = mips::FloatABI::Hard; 162 else { 163 ABI = llvm::StringSwitch<mips::FloatABI>(A->getValue()) 164 .Case("soft", mips::FloatABI::Soft) 165 .Case("hard", mips::FloatABI::Hard) 166 .Default(mips::FloatABI::Invalid); 167 if (ABI == mips::FloatABI::Invalid && !StringRef(A->getValue()).empty()) { 168 D.Diag(clang::diag::err_drv_invalid_mfloat_abi) << A->getAsString(Args); 169 ABI = mips::FloatABI::Hard; 170 } 171 } 172 } 173 174 // If unspecified, choose the default based on the platform. 175 if (ABI == mips::FloatABI::Invalid) { 176 if (Triple.isOSFreeBSD()) { 177 // For FreeBSD, assume "soft" on all flavors of MIPS. 178 ABI = mips::FloatABI::Soft; 179 } else { 180 // Assume "hard", because it's a default value used by gcc. 181 // When we start to recognize specific target MIPS processors, 182 // we will be able to select the default more correctly. 183 ABI = mips::FloatABI::Hard; 184 } 185 } 186 187 assert(ABI != mips::FloatABI::Invalid && "must select an ABI"); 188 return ABI; 189 } 190 191 void mips::getMIPSTargetFeatures(const Driver &D, const llvm::Triple &Triple, 192 const ArgList &Args, 193 std::vector<StringRef> &Features) { 194 StringRef CPUName; 195 StringRef ABIName; 196 getMipsCPUAndABI(Args, Triple, CPUName, ABIName); 197 ABIName = getGnuCompatibleMipsABIName(ABIName); 198 199 // Historically, PIC code for MIPS was associated with -mabicalls, a.k.a 200 // SVR4 abicalls. Static code does not use SVR4 calling sequences. An ABI 201 // extension was developed by Richard Sandiford & Code Sourcery to support 202 // static code calling PIC code (CPIC). For O32 and N32 this means we have 203 // several combinations of PIC/static and abicalls. Pure static, static 204 // with the CPIC extension, and pure PIC code. 205 206 // At final link time, O32 and N32 with CPIC will have another section 207 // added to the binary which contains the stub functions to perform 208 // any fixups required for PIC code. 209 210 // For N64, the situation is more regular: code can either be static 211 // (non-abicalls) or PIC (abicalls). GCC has traditionally picked PIC code 212 // code for N64. Since Clang has already built the relocation model portion 213 // of the commandline, we pick add +noabicalls feature in the N64 static 214 // case. 215 216 // The is another case to be accounted for: -msym32, which enforces that all 217 // symbols have 32 bits in size. In this case, N64 can in theory use CPIC 218 // but it is unsupported. 219 220 // The combinations for N64 are: 221 // a) Static without abicalls and 64bit symbols. 222 // b) Static with abicalls and 32bit symbols. 223 // c) PIC with abicalls and 64bit symbols. 224 225 // For case (a) we need to add +noabicalls for N64. 226 227 bool IsN64 = ABIName == "64"; 228 bool IsPIC = false; 229 bool NonPIC = false; 230 231 Arg *LastPICArg = Args.getLastArg(options::OPT_fPIC, options::OPT_fno_PIC, 232 options::OPT_fpic, options::OPT_fno_pic, 233 options::OPT_fPIE, options::OPT_fno_PIE, 234 options::OPT_fpie, options::OPT_fno_pie); 235 if (LastPICArg) { 236 Option O = LastPICArg->getOption(); 237 NonPIC = 238 (O.matches(options::OPT_fno_PIC) || O.matches(options::OPT_fno_pic) || 239 O.matches(options::OPT_fno_PIE) || O.matches(options::OPT_fno_pie)); 240 IsPIC = 241 (O.matches(options::OPT_fPIC) || O.matches(options::OPT_fpic) || 242 O.matches(options::OPT_fPIE) || O.matches(options::OPT_fpie)); 243 } 244 245 bool UseAbiCalls = false; 246 247 Arg *ABICallsArg = 248 Args.getLastArg(options::OPT_mabicalls, options::OPT_mno_abicalls); 249 UseAbiCalls = 250 !ABICallsArg || ABICallsArg->getOption().matches(options::OPT_mabicalls); 251 252 if (IsN64 && NonPIC && (!ABICallsArg || UseAbiCalls)) { 253 D.Diag(diag::warn_drv_unsupported_pic_with_mabicalls) 254 << LastPICArg->getAsString(Args) << (!ABICallsArg ? 0 : 1); 255 } 256 257 if (ABICallsArg && !UseAbiCalls && IsPIC) { 258 D.Diag(diag::err_drv_unsupported_noabicalls_pic); 259 } 260 261 if (!UseAbiCalls) 262 Features.push_back("+noabicalls"); 263 else 264 Features.push_back("-noabicalls"); 265 266 if (Arg *A = Args.getLastArg(options::OPT_mlong_calls, 267 options::OPT_mno_long_calls)) { 268 if (A->getOption().matches(options::OPT_mno_long_calls)) 269 Features.push_back("-long-calls"); 270 else if (!UseAbiCalls) 271 Features.push_back("+long-calls"); 272 else 273 D.Diag(diag::warn_drv_unsupported_longcalls) << (ABICallsArg ? 0 : 1); 274 } 275 276 if (Arg *A = Args.getLastArg(options::OPT_mxgot, options::OPT_mno_xgot)) { 277 if (A->getOption().matches(options::OPT_mxgot)) 278 Features.push_back("+xgot"); 279 else 280 Features.push_back("-xgot"); 281 } 282 283 mips::FloatABI FloatABI = mips::getMipsFloatABI(D, Args, Triple); 284 if (FloatABI == mips::FloatABI::Soft) { 285 // FIXME: Note, this is a hack. We need to pass the selected float 286 // mode to the MipsTargetInfoBase to define appropriate macros there. 287 // Now it is the only method. 288 Features.push_back("+soft-float"); 289 } 290 291 if (Arg *A = Args.getLastArg(options::OPT_mnan_EQ)) { 292 StringRef Val = StringRef(A->getValue()); 293 if (Val == "2008") { 294 if (mips::getIEEE754Standard(CPUName) & mips::Std2008) 295 Features.push_back("+nan2008"); 296 else { 297 Features.push_back("-nan2008"); 298 D.Diag(diag::warn_target_unsupported_nan2008) << CPUName; 299 } 300 } else if (Val == "legacy") { 301 if (mips::getIEEE754Standard(CPUName) & mips::Legacy) 302 Features.push_back("-nan2008"); 303 else { 304 Features.push_back("+nan2008"); 305 D.Diag(diag::warn_target_unsupported_nanlegacy) << CPUName; 306 } 307 } else 308 D.Diag(diag::err_drv_unsupported_option_argument) 309 << A->getOption().getName() << Val; 310 } 311 312 if (Arg *A = Args.getLastArg(options::OPT_mabs_EQ)) { 313 StringRef Val = StringRef(A->getValue()); 314 if (Val == "2008") { 315 if (mips::getIEEE754Standard(CPUName) & mips::Std2008) { 316 Features.push_back("+abs2008"); 317 } else { 318 Features.push_back("-abs2008"); 319 D.Diag(diag::warn_target_unsupported_abs2008) << CPUName; 320 } 321 } else if (Val == "legacy") { 322 if (mips::getIEEE754Standard(CPUName) & mips::Legacy) { 323 Features.push_back("-abs2008"); 324 } else { 325 Features.push_back("+abs2008"); 326 D.Diag(diag::warn_target_unsupported_abslegacy) << CPUName; 327 } 328 } else { 329 D.Diag(diag::err_drv_unsupported_option_argument) 330 << A->getOption().getName() << Val; 331 } 332 } 333 334 AddTargetFeature(Args, Features, options::OPT_msingle_float, 335 options::OPT_mdouble_float, "single-float"); 336 AddTargetFeature(Args, Features, options::OPT_mips16, options::OPT_mno_mips16, 337 "mips16"); 338 AddTargetFeature(Args, Features, options::OPT_mmicromips, 339 options::OPT_mno_micromips, "micromips"); 340 AddTargetFeature(Args, Features, options::OPT_mdsp, options::OPT_mno_dsp, 341 "dsp"); 342 AddTargetFeature(Args, Features, options::OPT_mdspr2, options::OPT_mno_dspr2, 343 "dspr2"); 344 AddTargetFeature(Args, Features, options::OPT_mmsa, options::OPT_mno_msa, 345 "msa"); 346 347 // Add the last -mfp32/-mfpxx/-mfp64, if none are given and the ABI is O32 348 // pass -mfpxx, or if none are given and fp64a is default, pass fp64 and 349 // nooddspreg. 350 if (Arg *A = Args.getLastArg(options::OPT_mfp32, options::OPT_mfpxx, 351 options::OPT_mfp64)) { 352 if (A->getOption().matches(options::OPT_mfp32)) 353 Features.push_back("-fp64"); 354 else if (A->getOption().matches(options::OPT_mfpxx)) { 355 Features.push_back("+fpxx"); 356 Features.push_back("+nooddspreg"); 357 } else 358 Features.push_back("+fp64"); 359 } else if (mips::shouldUseFPXX(Args, Triple, CPUName, ABIName, FloatABI)) { 360 Features.push_back("+fpxx"); 361 Features.push_back("+nooddspreg"); 362 } else if (mips::isFP64ADefault(Triple, CPUName)) { 363 Features.push_back("+fp64"); 364 Features.push_back("+nooddspreg"); 365 } 366 367 AddTargetFeature(Args, Features, options::OPT_mno_odd_spreg, 368 options::OPT_modd_spreg, "nooddspreg"); 369 AddTargetFeature(Args, Features, options::OPT_mno_madd4, options::OPT_mmadd4, 370 "nomadd4"); 371 AddTargetFeature(Args, Features, options::OPT_mmt, options::OPT_mno_mt, "mt"); 372 AddTargetFeature(Args, Features, options::OPT_mcrc, options::OPT_mno_crc, 373 "crc"); 374 AddTargetFeature(Args, Features, options::OPT_mvirt, options::OPT_mno_virt, 375 "virt"); 376 AddTargetFeature(Args, Features, options::OPT_mginv, options::OPT_mno_ginv, 377 "ginv"); 378 379 if (Arg *A = Args.getLastArg(options::OPT_mindirect_jump_EQ)) { 380 StringRef Val = StringRef(A->getValue()); 381 if (Val == "hazard") { 382 Arg *B = 383 Args.getLastArg(options::OPT_mmicromips, options::OPT_mno_micromips); 384 Arg *C = Args.getLastArg(options::OPT_mips16, options::OPT_mno_mips16); 385 386 if (B && B->getOption().matches(options::OPT_mmicromips)) 387 D.Diag(diag::err_drv_unsupported_indirect_jump_opt) 388 << "hazard" << "micromips"; 389 else if (C && C->getOption().matches(options::OPT_mips16)) 390 D.Diag(diag::err_drv_unsupported_indirect_jump_opt) 391 << "hazard" << "mips16"; 392 else if (mips::supportsIndirectJumpHazardBarrier(CPUName)) 393 Features.push_back("+use-indirect-jump-hazard"); 394 else 395 D.Diag(diag::err_drv_unsupported_indirect_jump_opt) 396 << "hazard" << CPUName; 397 } else 398 D.Diag(diag::err_drv_unknown_indirect_jump_opt) << Val; 399 } 400 } 401 402 mips::IEEE754Standard mips::getIEEE754Standard(StringRef &CPU) { 403 // Strictly speaking, mips32r2 and mips64r2 do not conform to the 404 // IEEE754-2008 standard. Support for this standard was first introduced 405 // in Release 3. However, other compilers have traditionally allowed it 406 // for Release 2 so we should do the same. 407 return (IEEE754Standard)llvm::StringSwitch<int>(CPU) 408 .Case("mips1", Legacy) 409 .Case("mips2", Legacy) 410 .Case("mips3", Legacy) 411 .Case("mips4", Legacy) 412 .Case("mips5", Legacy) 413 .Case("mips32", Legacy) 414 .Case("mips32r2", Legacy | Std2008) 415 .Case("mips32r3", Legacy | Std2008) 416 .Case("mips32r5", Legacy | Std2008) 417 .Case("mips32r6", Std2008) 418 .Case("mips64", Legacy) 419 .Case("mips64r2", Legacy | Std2008) 420 .Case("mips64r3", Legacy | Std2008) 421 .Case("mips64r5", Legacy | Std2008) 422 .Case("mips64r6", Std2008) 423 .Default(Std2008); 424 } 425 426 bool mips::hasCompactBranches(StringRef &CPU) { 427 // mips32r6 and mips64r6 have compact branches. 428 return llvm::StringSwitch<bool>(CPU) 429 .Case("mips32r6", true) 430 .Case("mips64r6", true) 431 .Default(false); 432 } 433 434 bool mips::hasMipsAbiArg(const ArgList &Args, const char *Value) { 435 Arg *A = Args.getLastArg(options::OPT_mabi_EQ); 436 return A && (A->getValue() == StringRef(Value)); 437 } 438 439 bool mips::isUCLibc(const ArgList &Args) { 440 Arg *A = Args.getLastArg(options::OPT_m_libc_Group); 441 return A && A->getOption().matches(options::OPT_muclibc); 442 } 443 444 bool mips::isNaN2008(const ArgList &Args, const llvm::Triple &Triple) { 445 if (Arg *NaNArg = Args.getLastArg(options::OPT_mnan_EQ)) 446 return llvm::StringSwitch<bool>(NaNArg->getValue()) 447 .Case("2008", true) 448 .Case("legacy", false) 449 .Default(false); 450 451 // NaN2008 is the default for MIPS32r6/MIPS64r6. 452 return llvm::StringSwitch<bool>(getCPUName(Args, Triple)) 453 .Cases("mips32r6", "mips64r6", true) 454 .Default(false); 455 } 456 457 bool mips::isFP64ADefault(const llvm::Triple &Triple, StringRef CPUName) { 458 if (!Triple.isAndroid()) 459 return false; 460 461 // Android MIPS32R6 defaults to FP64A. 462 return llvm::StringSwitch<bool>(CPUName) 463 .Case("mips32r6", true) 464 .Default(false); 465 } 466 467 bool mips::isFPXXDefault(const llvm::Triple &Triple, StringRef CPUName, 468 StringRef ABIName, mips::FloatABI FloatABI) { 469 if (Triple.getVendor() != llvm::Triple::ImaginationTechnologies && 470 Triple.getVendor() != llvm::Triple::MipsTechnologies && 471 !Triple.isAndroid()) 472 return false; 473 474 if (ABIName != "32") 475 return false; 476 477 // FPXX shouldn't be used if either -msoft-float or -mfloat-abi=soft is 478 // present. 479 if (FloatABI == mips::FloatABI::Soft) 480 return false; 481 482 return llvm::StringSwitch<bool>(CPUName) 483 .Cases("mips2", "mips3", "mips4", "mips5", true) 484 .Cases("mips32", "mips32r2", "mips32r3", "mips32r5", true) 485 .Cases("mips64", "mips64r2", "mips64r3", "mips64r5", true) 486 .Default(false); 487 } 488 489 bool mips::shouldUseFPXX(const ArgList &Args, const llvm::Triple &Triple, 490 StringRef CPUName, StringRef ABIName, 491 mips::FloatABI FloatABI) { 492 bool UseFPXX = isFPXXDefault(Triple, CPUName, ABIName, FloatABI); 493 494 // FPXX shouldn't be used if -msingle-float is present. 495 if (Arg *A = Args.getLastArg(options::OPT_msingle_float, 496 options::OPT_mdouble_float)) 497 if (A->getOption().matches(options::OPT_msingle_float)) 498 UseFPXX = false; 499 500 return UseFPXX; 501 } 502 503 bool mips::supportsIndirectJumpHazardBarrier(StringRef &CPU) { 504 // Supporting the hazard barrier method of dealing with indirect 505 // jumps requires MIPSR2 support. 506 return llvm::StringSwitch<bool>(CPU) 507 .Case("mips32r2", true) 508 .Case("mips32r3", true) 509 .Case("mips32r5", true) 510 .Case("mips32r6", true) 511 .Case("mips64r2", true) 512 .Case("mips64r3", true) 513 .Case("mips64r5", true) 514 .Case("mips64r6", true) 515 .Case("octeon", true) 516 .Case("p5600", true) 517 .Default(false); 518 } 519