1 //===--- OpenBSD.cpp - OpenBSD ToolChain 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 "OpenBSD.h" 10 #include "Arch/ARM.h" 11 #include "Arch/Mips.h" 12 #include "Arch/Sparc.h" 13 #include "CommonArgs.h" 14 #include "clang/Config/config.h" 15 #include "clang/Driver/Compilation.h" 16 #include "clang/Driver/Options.h" 17 #include "clang/Driver/SanitizerArgs.h" 18 #include "llvm/Option/ArgList.h" 19 #include "llvm/Support/Path.h" 20 #include "llvm/Support/VirtualFileSystem.h" 21 22 using namespace clang::driver; 23 using namespace clang::driver::tools; 24 using namespace clang::driver::toolchains; 25 using namespace clang; 26 using namespace llvm::opt; 27 28 void openbsd::Assembler::ConstructJob(Compilation &C, const JobAction &JA, 29 const InputInfo &Output, 30 const InputInfoList &Inputs, 31 const ArgList &Args, 32 const char *LinkingOutput) const { 33 const toolchains::OpenBSD &ToolChain = 34 static_cast<const toolchains::OpenBSD &>(getToolChain()); 35 const Driver &D = ToolChain.getDriver(); 36 const llvm::Triple &Triple = ToolChain.getTriple(); 37 38 claimNoWarnArgs(Args); 39 ArgStringList CmdArgs; 40 41 switch (ToolChain.getArch()) { 42 case llvm::Triple::x86: 43 // When building 32-bit code on OpenBSD/amd64, we have to explicitly 44 // instruct as in the base system to assemble 32-bit code. 45 CmdArgs.push_back("--32"); 46 break; 47 48 case llvm::Triple::arm: 49 case llvm::Triple::armeb: { 50 StringRef MArch, MCPU; 51 arm::getARMArchCPUFromArgs(Args, MArch, MCPU, /*FromAs*/ true); 52 std::string Arch = arm::getARMTargetCPU(MCPU, MArch, Triple); 53 CmdArgs.push_back(Args.MakeArgString("-mcpu=" + Arch)); 54 break; 55 } 56 57 case llvm::Triple::ppc: 58 CmdArgs.push_back("-mppc"); 59 CmdArgs.push_back("-many"); 60 break; 61 62 case llvm::Triple::sparcv9: { 63 CmdArgs.push_back("-64"); 64 std::string CPU = getCPUName(D, Args, Triple); 65 CmdArgs.push_back(sparc::getSparcAsmModeForCPU(CPU, Triple)); 66 AddAssemblerKPIC(ToolChain, Args, CmdArgs); 67 break; 68 } 69 70 case llvm::Triple::mips64: 71 case llvm::Triple::mips64el: { 72 StringRef CPUName; 73 StringRef ABIName; 74 mips::getMipsCPUAndABI(Args, Triple, CPUName, ABIName); 75 76 CmdArgs.push_back("-march"); 77 CmdArgs.push_back(CPUName.data()); 78 79 CmdArgs.push_back("-mabi"); 80 CmdArgs.push_back(mips::getGnuCompatibleMipsABIName(ABIName).data()); 81 82 if (Triple.isLittleEndian()) 83 CmdArgs.push_back("-EL"); 84 else 85 CmdArgs.push_back("-EB"); 86 87 AddAssemblerKPIC(ToolChain, Args, CmdArgs); 88 break; 89 } 90 91 default: 92 break; 93 } 94 95 Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler); 96 97 CmdArgs.push_back("-o"); 98 CmdArgs.push_back(Output.getFilename()); 99 100 for (const auto &II : Inputs) 101 CmdArgs.push_back(II.getFilename()); 102 103 const char *Exec = Args.MakeArgString(ToolChain.GetProgramPath("as")); 104 C.addCommand(std::make_unique<Command>(JA, *this, 105 ResponseFileSupport::AtFileCurCP(), 106 Exec, CmdArgs, Inputs, Output)); 107 } 108 109 void openbsd::Linker::ConstructJob(Compilation &C, const JobAction &JA, 110 const InputInfo &Output, 111 const InputInfoList &Inputs, 112 const ArgList &Args, 113 const char *LinkingOutput) const { 114 const toolchains::OpenBSD &ToolChain = 115 static_cast<const toolchains::OpenBSD &>(getToolChain()); 116 const Driver &D = ToolChain.getDriver(); 117 const llvm::Triple::ArchType Arch = ToolChain.getArch(); 118 ArgStringList CmdArgs; 119 bool Static = Args.hasArg(options::OPT_static); 120 bool Shared = Args.hasArg(options::OPT_shared); 121 bool Profiling = Args.hasArg(options::OPT_pg); 122 bool Pie = Args.hasArg(options::OPT_pie); 123 bool Nopie = Args.hasArg(options::OPT_nopie); 124 125 // Silence warning for "clang -g foo.o -o foo" 126 Args.ClaimAllArgs(options::OPT_g_Group); 127 // and "clang -emit-llvm foo.o -o foo" 128 Args.ClaimAllArgs(options::OPT_emit_llvm); 129 // and for "clang -w foo.o -o foo". Other warning options are already 130 // handled somewhere else. 131 Args.ClaimAllArgs(options::OPT_w); 132 133 if (!D.SysRoot.empty()) 134 CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot)); 135 136 if (Arch == llvm::Triple::mips64) 137 CmdArgs.push_back("-EB"); 138 else if (Arch == llvm::Triple::mips64el) 139 CmdArgs.push_back("-EL"); 140 141 if (!Args.hasArg(options::OPT_nostdlib) && !Shared) { 142 CmdArgs.push_back("-e"); 143 CmdArgs.push_back("__start"); 144 } 145 146 CmdArgs.push_back("--eh-frame-hdr"); 147 if (Static) { 148 CmdArgs.push_back("-Bstatic"); 149 } else { 150 if (Args.hasArg(options::OPT_rdynamic)) 151 CmdArgs.push_back("-export-dynamic"); 152 CmdArgs.push_back("-Bdynamic"); 153 if (Shared) { 154 CmdArgs.push_back("-shared"); 155 } else if (!Args.hasArg(options::OPT_r)) { 156 CmdArgs.push_back("-dynamic-linker"); 157 CmdArgs.push_back("/usr/libexec/ld.so"); 158 } 159 } 160 161 if (Pie) 162 CmdArgs.push_back("-pie"); 163 if (Nopie || Profiling) 164 CmdArgs.push_back("-nopie"); 165 166 if (Arch == llvm::Triple::riscv64) 167 CmdArgs.push_back("-X"); 168 169 if (Output.isFilename()) { 170 CmdArgs.push_back("-o"); 171 CmdArgs.push_back(Output.getFilename()); 172 } else { 173 assert(Output.isNothing() && "Invalid output."); 174 } 175 176 if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles, 177 options::OPT_r)) { 178 const char *crt0 = nullptr; 179 const char *crtbegin = nullptr; 180 if (!Shared) { 181 if (Profiling) 182 crt0 = "gcrt0.o"; 183 else if (Static && !Nopie) 184 crt0 = "rcrt0.o"; 185 else 186 crt0 = "crt0.o"; 187 crtbegin = "crtbegin.o"; 188 } else { 189 crtbegin = "crtbeginS.o"; 190 } 191 192 if (crt0) 193 CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crt0))); 194 CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin))); 195 } 196 197 Args.AddAllArgs(CmdArgs, options::OPT_L); 198 ToolChain.AddFilePathLibArgs(Args, CmdArgs); 199 Args.AddAllArgs(CmdArgs, 200 {options::OPT_T_Group, options::OPT_s, options::OPT_t, 201 options::OPT_Z_Flag, options::OPT_r}); 202 203 bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs); 204 bool NeedsXRayDeps = addXRayRuntime(ToolChain, Args, CmdArgs); 205 AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA); 206 207 if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs, 208 options::OPT_r)) { 209 // Use the static OpenMP runtime with -static-openmp 210 bool StaticOpenMP = Args.hasArg(options::OPT_static_openmp) && !Static; 211 addOpenMPRuntime(CmdArgs, ToolChain, Args, StaticOpenMP); 212 213 if (D.CCCIsCXX()) { 214 if (ToolChain.ShouldLinkCXXStdlib(Args)) 215 ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs); 216 if (Profiling) 217 CmdArgs.push_back("-lm_p"); 218 else 219 CmdArgs.push_back("-lm"); 220 } 221 if (NeedsSanitizerDeps) { 222 CmdArgs.push_back(ToolChain.getCompilerRTArgString(Args, "builtins")); 223 linkSanitizerRuntimeDeps(ToolChain, CmdArgs); 224 } 225 if (NeedsXRayDeps) { 226 CmdArgs.push_back(ToolChain.getCompilerRTArgString(Args, "builtins")); 227 linkXRayRuntimeDeps(ToolChain, CmdArgs); 228 } 229 // FIXME: For some reason GCC passes -lgcc before adding 230 // the default system libraries. Just mimic this for now. 231 CmdArgs.push_back("-lcompiler_rt"); 232 233 if (Args.hasArg(options::OPT_pthread)) { 234 if (!Shared && Profiling) 235 CmdArgs.push_back("-lpthread_p"); 236 else 237 CmdArgs.push_back("-lpthread"); 238 } 239 240 if (!Shared) { 241 if (Profiling) 242 CmdArgs.push_back("-lc_p"); 243 else 244 CmdArgs.push_back("-lc"); 245 } 246 247 CmdArgs.push_back("-lcompiler_rt"); 248 } 249 250 if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles, 251 options::OPT_r)) { 252 const char *crtend = nullptr; 253 if (!Shared) 254 crtend = "crtend.o"; 255 else 256 crtend = "crtendS.o"; 257 258 CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend))); 259 } 260 261 ToolChain.addProfileRTLibs(Args, CmdArgs); 262 263 const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath()); 264 C.addCommand(std::make_unique<Command>(JA, *this, 265 ResponseFileSupport::AtFileCurCP(), 266 Exec, CmdArgs, Inputs, Output)); 267 } 268 269 SanitizerMask OpenBSD::getSupportedSanitizers() const { 270 const bool IsX86 = getTriple().getArch() == llvm::Triple::x86; 271 const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64; 272 273 // For future use, only UBsan at the moment 274 SanitizerMask Res = ToolChain::getSupportedSanitizers(); 275 276 if (IsX86 || IsX86_64) { 277 Res |= SanitizerKind::Vptr; 278 Res |= SanitizerKind::Fuzzer; 279 Res |= SanitizerKind::FuzzerNoLink; 280 } 281 282 return Res; 283 } 284 285 /// OpenBSD - OpenBSD tool chain which can call as(1) and ld(1) directly. 286 287 OpenBSD::OpenBSD(const Driver &D, const llvm::Triple &Triple, 288 const ArgList &Args) 289 : Generic_ELF(D, Triple, Args) { 290 getFilePaths().push_back(concat(getDriver().SysRoot, "/usr/lib")); 291 } 292 293 void OpenBSD::AddClangSystemIncludeArgs( 294 const llvm::opt::ArgList &DriverArgs, 295 llvm::opt::ArgStringList &CC1Args) const { 296 const Driver &D = getDriver(); 297 298 if (DriverArgs.hasArg(clang::driver::options::OPT_nostdinc)) 299 return; 300 301 if (!DriverArgs.hasArg(options::OPT_nobuiltininc)) { 302 SmallString<128> Dir(D.ResourceDir); 303 llvm::sys::path::append(Dir, "include"); 304 addSystemInclude(DriverArgs, CC1Args, Dir.str()); 305 } 306 307 if (DriverArgs.hasArg(options::OPT_nostdlibinc)) 308 return; 309 310 // Check for configure-time C include directories. 311 StringRef CIncludeDirs(C_INCLUDE_DIRS); 312 if (CIncludeDirs != "") { 313 SmallVector<StringRef, 5> dirs; 314 CIncludeDirs.split(dirs, ":"); 315 for (StringRef dir : dirs) { 316 StringRef Prefix = 317 llvm::sys::path::is_absolute(dir) ? StringRef(D.SysRoot) : ""; 318 addExternCSystemInclude(DriverArgs, CC1Args, Prefix + dir); 319 } 320 return; 321 } 322 323 addExternCSystemInclude(DriverArgs, CC1Args, 324 concat(D.SysRoot, "/usr/include")); 325 } 326 327 void OpenBSD::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs, 328 llvm::opt::ArgStringList &CC1Args) const { 329 addSystemInclude(DriverArgs, CC1Args, 330 concat(getDriver().SysRoot, "/usr/include/c++/v1")); 331 } 332 333 void OpenBSD::AddCXXStdlibLibArgs(const ArgList &Args, 334 ArgStringList &CmdArgs) const { 335 bool Profiling = Args.hasArg(options::OPT_pg); 336 337 CmdArgs.push_back(Profiling ? "-lc++_p" : "-lc++"); 338 if (Args.hasArg(options::OPT_fexperimental_library)) 339 CmdArgs.push_back("-lc++experimental"); 340 CmdArgs.push_back(Profiling ? "-lc++abi_p" : "-lc++abi"); 341 CmdArgs.push_back(Profiling ? "-lpthread_p" : "-lpthread"); 342 } 343 344 std::string OpenBSD::getCompilerRT(const ArgList &Args, StringRef Component, 345 FileType Type) const { 346 if (Component == "builtins") { 347 SmallString<128> Path(getDriver().SysRoot); 348 llvm::sys::path::append(Path, "/usr/lib/libcompiler_rt.a"); 349 return std::string(Path.str()); 350 } 351 SmallString<128> P(getDriver().ResourceDir); 352 std::string CRTBasename = 353 buildCompilerRTBasename(Args, Component, Type, /*AddArch=*/false); 354 llvm::sys::path::append(P, "lib", CRTBasename); 355 // Checks if this is the base system case which uses a different location. 356 if (getVFS().exists(P)) 357 return std::string(P.str()); 358 return ToolChain::getCompilerRT(Args, Component, Type); 359 } 360 361 Tool *OpenBSD::buildAssembler() const { 362 return new tools::openbsd::Assembler(*this); 363 } 364 365 Tool *OpenBSD::buildLinker() const { return new tools::openbsd::Linker(*this); } 366 367 bool OpenBSD::HasNativeLLVMSupport() const { return true; } 368 369 ToolChain::UnwindTableLevel 370 OpenBSD::getDefaultUnwindTableLevel(const ArgList &Args) const { 371 switch (getArch()) { 372 case llvm::Triple::arm: 373 return UnwindTableLevel::None; 374 default: 375 return UnwindTableLevel::Asynchronous; 376 } 377 } 378