1 //===--- PPC.cpp - PPC Helpers for Tools ------------------------*- 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 "PPC.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 #include "llvm/Support/Host.h" 17 18 using namespace clang::driver; 19 using namespace clang::driver::tools; 20 using namespace clang; 21 using namespace llvm::opt; 22 23 static std::string getPPCGenericTargetCPU(const llvm::Triple &T) { 24 // LLVM may default to generating code for the native CPU, 25 // but, like gcc, we default to a more generic option for 26 // each architecture. (except on AIX) 27 if (T.isOSAIX()) 28 return "pwr7"; 29 else if (T.getArch() == llvm::Triple::ppc64le) 30 return "ppc64le"; 31 else if (T.getArch() == llvm::Triple::ppc64) 32 return "ppc64"; 33 else 34 return "ppc"; 35 } 36 37 static std::string normalizeCPUName(StringRef CPUName, const llvm::Triple &T) { 38 // Clang/LLVM does not actually support code generation 39 // for the 405 CPU. However, there are uses of this CPU ID 40 // in projects that previously used GCC and rely on Clang 41 // accepting it. Clang has always ignored it and passed the 42 // generic CPU ID to the back end. 43 if (CPUName == "generic" || CPUName == "405") 44 return getPPCGenericTargetCPU(T); 45 46 if (CPUName == "native") { 47 std::string CPU = std::string(llvm::sys::getHostCPUName()); 48 if (!CPU.empty() && CPU != "generic") 49 return CPU; 50 else 51 return getPPCGenericTargetCPU(T); 52 } 53 54 return llvm::StringSwitch<const char *>(CPUName) 55 .Case("common", "generic") 56 .Case("440fp", "440") 57 .Case("630", "pwr3") 58 .Case("G3", "g3") 59 .Case("G4", "g4") 60 .Case("G4+", "g4+") 61 .Case("8548", "e500") 62 .Case("G5", "g5") 63 .Case("power3", "pwr3") 64 .Case("power4", "pwr4") 65 .Case("power5", "pwr5") 66 .Case("power5x", "pwr5x") 67 .Case("power6", "pwr6") 68 .Case("power6x", "pwr6x") 69 .Case("power7", "pwr7") 70 .Case("power8", "pwr8") 71 .Case("power9", "pwr9") 72 .Case("power10", "pwr10") 73 .Case("future", "future") 74 .Case("powerpc", "ppc") 75 .Case("powerpc64", "ppc64") 76 .Case("powerpc64le", "ppc64le") 77 .Default(CPUName.data()); 78 } 79 80 /// Get the (LLVM) name of the PowerPC cpu we are tuning for. 81 std::string ppc::getPPCTuneCPU(const ArgList &Args, const llvm::Triple &T) { 82 if (Arg *A = Args.getLastArg(clang::driver::options::OPT_mtune_EQ)) 83 return normalizeCPUName(A->getValue(), T); 84 return getPPCGenericTargetCPU(T); 85 } 86 87 /// Get the (LLVM) name of the PowerPC cpu we are targeting. 88 std::string ppc::getPPCTargetCPU(const ArgList &Args, const llvm::Triple &T) { 89 if (Arg *A = Args.getLastArg(clang::driver::options::OPT_mcpu_EQ)) 90 return normalizeCPUName(A->getValue(), T); 91 return getPPCGenericTargetCPU(T); 92 } 93 94 const char *ppc::getPPCAsmModeForCPU(StringRef Name) { 95 return llvm::StringSwitch<const char *>(Name) 96 .Case("pwr7", "-mpower7") 97 .Case("power7", "-mpower7") 98 .Case("pwr8", "-mpower8") 99 .Case("power8", "-mpower8") 100 .Case("ppc64le", "-mpower8") 101 .Case("pwr9", "-mpower9") 102 .Case("power9", "-mpower9") 103 .Case("pwr10", "-mpower10") 104 .Case("power10", "-mpower10") 105 .Default("-many"); 106 } 107 108 void ppc::getPPCTargetFeatures(const Driver &D, const llvm::Triple &Triple, 109 const ArgList &Args, 110 std::vector<StringRef> &Features) { 111 if (Triple.getSubArch() == llvm::Triple::PPCSubArch_spe) 112 Features.push_back("+spe"); 113 114 handleTargetFeaturesGroup(Args, Features, options::OPT_m_ppc_Features_Group); 115 116 ppc::FloatABI FloatABI = ppc::getPPCFloatABI(D, Args); 117 if (FloatABI == ppc::FloatABI::Soft) 118 Features.push_back("-hard-float"); 119 120 ppc::ReadGOTPtrMode ReadGOT = ppc::getPPCReadGOTPtrMode(D, Triple, Args); 121 if (ReadGOT == ppc::ReadGOTPtrMode::SecurePlt) 122 Features.push_back("+secure-plt"); 123 } 124 125 ppc::ReadGOTPtrMode ppc::getPPCReadGOTPtrMode(const Driver &D, const llvm::Triple &Triple, 126 const ArgList &Args) { 127 if (Args.getLastArg(options::OPT_msecure_plt)) 128 return ppc::ReadGOTPtrMode::SecurePlt; 129 if ((Triple.isOSFreeBSD() && Triple.getOSMajorVersion() >= 13) || 130 Triple.isOSNetBSD() || Triple.isOSOpenBSD() || Triple.isMusl()) 131 return ppc::ReadGOTPtrMode::SecurePlt; 132 else 133 return ppc::ReadGOTPtrMode::Bss; 134 } 135 136 ppc::FloatABI ppc::getPPCFloatABI(const Driver &D, const ArgList &Args) { 137 ppc::FloatABI ABI = ppc::FloatABI::Invalid; 138 if (Arg *A = 139 Args.getLastArg(options::OPT_msoft_float, options::OPT_mhard_float, 140 options::OPT_mfloat_abi_EQ)) { 141 if (A->getOption().matches(options::OPT_msoft_float)) 142 ABI = ppc::FloatABI::Soft; 143 else if (A->getOption().matches(options::OPT_mhard_float)) 144 ABI = ppc::FloatABI::Hard; 145 else { 146 ABI = llvm::StringSwitch<ppc::FloatABI>(A->getValue()) 147 .Case("soft", ppc::FloatABI::Soft) 148 .Case("hard", ppc::FloatABI::Hard) 149 .Default(ppc::FloatABI::Invalid); 150 if (ABI == ppc::FloatABI::Invalid && !StringRef(A->getValue()).empty()) { 151 D.Diag(clang::diag::err_drv_invalid_mfloat_abi) << A->getAsString(Args); 152 ABI = ppc::FloatABI::Hard; 153 } 154 } 155 } 156 157 // If unspecified, choose the default based on the platform. 158 if (ABI == ppc::FloatABI::Invalid) { 159 ABI = ppc::FloatABI::Hard; 160 } 161 162 return ABI; 163 } 164 165 bool ppc::hasPPCAbiArg(const ArgList &Args, const char *Value) { 166 Arg *A = Args.getLastArg(options::OPT_mabi_EQ); 167 return A && (A->getValue() == StringRef(Value)); 168 } 169