1 //===---------------- ARMTargetParserCommon ---------------------*- 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 // Code that is common to ARMTargetParser and AArch64TargetParser. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "llvm/TargetParser/ARMTargetParserCommon.h" 14 #include "llvm/ADT/SmallVector.h" 15 #include "llvm/ADT/StringSwitch.h" 16 17 using namespace llvm; 18 19 StringRef ARM::getArchSynonym(StringRef Arch) { 20 return StringSwitch<StringRef>(Arch) 21 .Case("v5", "v5t") 22 .Case("v5e", "v5te") 23 .Case("v6j", "v6") 24 .Case("v6hl", "v6k") 25 .Cases("v6m", "v6sm", "v6s-m", "v6-m") 26 .Cases("v6z", "v6zk", "v6kz") 27 .Cases("v7", "v7a", "v7hl", "v7l", "v7-a") 28 .Case("v7r", "v7-r") 29 .Case("v7m", "v7-m") 30 .Case("v7em", "v7e-m") 31 .Cases("v8", "v8a", "v8l", "aarch64", "arm64", "v8-a") 32 .Case("v8.1a", "v8.1-a") 33 .Case("v8.2a", "v8.2-a") 34 .Case("v8.3a", "v8.3-a") 35 .Case("v8.4a", "v8.4-a") 36 .Case("v8.5a", "v8.5-a") 37 .Case("v8.6a", "v8.6-a") 38 .Case("v8.7a", "v8.7-a") 39 .Case("v8.8a", "v8.8-a") 40 .Case("v8.9a", "v8.9-a") 41 .Case("v8r", "v8-r") 42 .Cases("v9", "v9a", "v9-a") 43 .Case("v9.1a", "v9.1-a") 44 .Case("v9.2a", "v9.2-a") 45 .Case("v9.3a", "v9.3-a") 46 .Case("v9.4a", "v9.4-a") 47 .Case("v8m.base", "v8-m.base") 48 .Case("v8m.main", "v8-m.main") 49 .Case("v8.1m.main", "v8.1-m.main") 50 .Default(Arch); 51 } 52 53 StringRef ARM::getCanonicalArchName(StringRef Arch) { 54 size_t offset = StringRef::npos; 55 StringRef A = Arch; 56 StringRef Error = ""; 57 58 // Begins with "arm" / "thumb", move past it. 59 if (A.startswith("arm64_32")) 60 offset = 8; 61 else if (A.startswith("arm64e")) 62 offset = 6; 63 else if (A.startswith("arm64")) 64 offset = 5; 65 else if (A.startswith("aarch64_32")) 66 offset = 10; 67 else if (A.startswith("arm")) 68 offset = 3; 69 else if (A.startswith("thumb")) 70 offset = 5; 71 else if (A.startswith("aarch64")) { 72 offset = 7; 73 // AArch64 uses "_be", not "eb" suffix. 74 if (A.contains("eb")) 75 return Error; 76 if (A.substr(offset, 3) == "_be") 77 offset += 3; 78 } 79 80 // Ex. "armebv7", move past the "eb". 81 if (offset != StringRef::npos && A.substr(offset, 2) == "eb") 82 offset += 2; 83 // Or, if it ends with eb ("armv7eb"), chop it off. 84 else if (A.endswith("eb")) 85 A = A.substr(0, A.size() - 2); 86 // Trim the head 87 if (offset != StringRef::npos) 88 A = A.substr(offset); 89 90 // Empty string means offset reached the end, which means it's valid. 91 if (A.empty()) 92 return Arch; 93 94 // Only match non-marketing names 95 if (offset != StringRef::npos) { 96 // Must start with 'vN'. 97 if (A.size() >= 2 && (A[0] != 'v' || !std::isdigit(A[1]))) 98 return Error; 99 // Can't have an extra 'eb'. 100 if (A.contains("eb")) 101 return Error; 102 } 103 104 // Arch will either be a 'v' name (v7a) or a marketing name (xscale). 105 return A; 106 } 107 108 ARM::ISAKind ARM::parseArchISA(StringRef Arch) { 109 return StringSwitch<ISAKind>(Arch) 110 .StartsWith("aarch64", ISAKind::AARCH64) 111 .StartsWith("arm64", ISAKind::AARCH64) 112 .StartsWith("thumb", ISAKind::THUMB) 113 .StartsWith("arm", ISAKind::ARM) 114 .Default(ISAKind::INVALID); 115 } 116 117 ARM::EndianKind ARM::parseArchEndian(StringRef Arch) { 118 if (Arch.startswith("armeb") || Arch.startswith("thumbeb") || 119 Arch.startswith("aarch64_be")) 120 return EndianKind::BIG; 121 122 if (Arch.startswith("arm") || Arch.startswith("thumb")) { 123 if (Arch.endswith("eb")) 124 return EndianKind::BIG; 125 else 126 return EndianKind::LITTLE; 127 } 128 129 if (Arch.startswith("aarch64") || Arch.startswith("aarch64_32")) 130 return EndianKind::LITTLE; 131 132 return EndianKind::INVALID; 133 } 134 135 // Parse a branch protection specification, which has the form 136 // standard | none | [bti,pac-ret[+b-key,+leaf]*] 137 // Returns true on success, with individual elements of the specification 138 // returned in `PBP`. Returns false in error, with `Err` containing 139 // an erroneous part of the spec. 140 bool ARM::parseBranchProtection(StringRef Spec, ParsedBranchProtection &PBP, 141 StringRef &Err) { 142 PBP = {"none", "a_key", false}; 143 if (Spec == "none") 144 return true; // defaults are ok 145 146 if (Spec == "standard") { 147 PBP.Scope = "non-leaf"; 148 PBP.BranchTargetEnforcement = true; 149 return true; 150 } 151 152 SmallVector<StringRef, 4> Opts; 153 Spec.split(Opts, "+"); 154 for (int I = 0, E = Opts.size(); I != E; ++I) { 155 StringRef Opt = Opts[I].trim(); 156 if (Opt == "bti") { 157 PBP.BranchTargetEnforcement = true; 158 continue; 159 } 160 if (Opt == "pac-ret") { 161 PBP.Scope = "non-leaf"; 162 for (; I + 1 != E; ++I) { 163 StringRef PACOpt = Opts[I + 1].trim(); 164 if (PACOpt == "leaf") 165 PBP.Scope = "all"; 166 else if (PACOpt == "b-key") 167 PBP.Key = "b_key"; 168 else 169 break; 170 } 171 continue; 172 } 173 if (Opt == "") 174 Err = "<empty>"; 175 else 176 Err = Opt; 177 return false; 178 } 179 180 return true; 181 } 182