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