1 //===--- NetBSD.cpp - NetBSD 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 "NetBSD.h"
10 #include "Arch/ARM.h"
11 #include "Arch/Mips.h"
12 #include "Arch/Sparc.h"
13 #include "CommonArgs.h"
14 #include "clang/Driver/Compilation.h"
15 #include "clang/Driver/Driver.h"
16 #include "clang/Driver/Options.h"
17 #include "clang/Driver/SanitizerArgs.h"
18 #include "llvm/Option/ArgList.h"
19 
20 using namespace clang::driver;
21 using namespace clang::driver::tools;
22 using namespace clang::driver::toolchains;
23 using namespace clang;
24 using namespace llvm::opt;
25 
26 void netbsd::Assembler::ConstructJob(Compilation &C, const JobAction &JA,
27                                      const InputInfo &Output,
28                                      const InputInfoList &Inputs,
29                                      const ArgList &Args,
30                                      const char *LinkingOutput) const {
31   claimNoWarnArgs(Args);
32   ArgStringList CmdArgs;
33 
34   // GNU as needs different flags for creating the correct output format
35   // on architectures with different ABIs or optional feature sets.
36   switch (getToolChain().getArch()) {
37   case llvm::Triple::x86:
38     CmdArgs.push_back("--32");
39     break;
40   case llvm::Triple::arm:
41   case llvm::Triple::armeb:
42   case llvm::Triple::thumb:
43   case llvm::Triple::thumbeb: {
44     StringRef MArch, MCPU;
45     arm::getARMArchCPUFromArgs(Args, MArch, MCPU, /*FromAs*/ true);
46     std::string Arch =
47         arm::getARMTargetCPU(MCPU, MArch, getToolChain().getTriple());
48     CmdArgs.push_back(Args.MakeArgString("-mcpu=" + Arch));
49     break;
50   }
51 
52   case llvm::Triple::mips:
53   case llvm::Triple::mipsel:
54   case llvm::Triple::mips64:
55   case llvm::Triple::mips64el: {
56     StringRef CPUName;
57     StringRef ABIName;
58     mips::getMipsCPUAndABI(Args, getToolChain().getTriple(), CPUName, ABIName);
59 
60     CmdArgs.push_back("-march");
61     CmdArgs.push_back(CPUName.data());
62 
63     CmdArgs.push_back("-mabi");
64     CmdArgs.push_back(mips::getGnuCompatibleMipsABIName(ABIName).data());
65 
66     if (getToolChain().getTriple().isLittleEndian())
67       CmdArgs.push_back("-EL");
68     else
69       CmdArgs.push_back("-EB");
70 
71     AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
72     break;
73   }
74 
75   case llvm::Triple::sparc:
76   case llvm::Triple::sparcel: {
77     CmdArgs.push_back("-32");
78     std::string CPU = getCPUName(Args, getToolChain().getTriple());
79     CmdArgs.push_back(sparc::getSparcAsmModeForCPU(CPU, getToolChain().getTriple()));
80     AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
81     break;
82   }
83 
84   case llvm::Triple::sparcv9: {
85     CmdArgs.push_back("-64");
86     std::string CPU = getCPUName(Args, getToolChain().getTriple());
87     CmdArgs.push_back(sparc::getSparcAsmModeForCPU(CPU, getToolChain().getTriple()));
88     AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
89     break;
90   }
91 
92   default:
93     break;
94   }
95 
96   Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
97 
98   CmdArgs.push_back("-o");
99   CmdArgs.push_back(Output.getFilename());
100 
101   for (const auto &II : Inputs)
102     CmdArgs.push_back(II.getFilename());
103 
104   const char *Exec = Args.MakeArgString((getToolChain().GetProgramPath("as")));
105   C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
106 }
107 
108 void netbsd::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::NetBSD &ToolChain =
114     static_cast<const toolchains::NetBSD &>(getToolChain());
115   const Driver &D = ToolChain.getDriver();
116   ArgStringList CmdArgs;
117 
118   if (!D.SysRoot.empty())
119     CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
120 
121   CmdArgs.push_back("--eh-frame-hdr");
122   if (Args.hasArg(options::OPT_static)) {
123     CmdArgs.push_back("-Bstatic");
124     if (Args.hasArg(options::OPT_pie)) {
125       Args.AddAllArgs(CmdArgs, options::OPT_pie);
126       CmdArgs.push_back("--no-dynamic-linker");
127     }
128   } else {
129     if (Args.hasArg(options::OPT_rdynamic))
130       CmdArgs.push_back("-export-dynamic");
131     if (Args.hasArg(options::OPT_shared)) {
132       CmdArgs.push_back("-Bshareable");
133     } else {
134       Args.AddAllArgs(CmdArgs, options::OPT_pie);
135       CmdArgs.push_back("-dynamic-linker");
136       CmdArgs.push_back("/libexec/ld.elf_so");
137     }
138   }
139 
140   // Many NetBSD architectures support more than one ABI.
141   // Determine the correct emulation for ld.
142   switch (ToolChain.getArch()) {
143   case llvm::Triple::x86:
144     CmdArgs.push_back("-m");
145     CmdArgs.push_back("elf_i386");
146     break;
147   case llvm::Triple::arm:
148   case llvm::Triple::thumb:
149     CmdArgs.push_back("-m");
150     switch (ToolChain.getTriple().getEnvironment()) {
151     case llvm::Triple::EABI:
152     case llvm::Triple::GNUEABI:
153       CmdArgs.push_back("armelf_nbsd_eabi");
154       break;
155     case llvm::Triple::EABIHF:
156     case llvm::Triple::GNUEABIHF:
157       CmdArgs.push_back("armelf_nbsd_eabihf");
158       break;
159     default:
160       CmdArgs.push_back("armelf_nbsd");
161       break;
162     }
163     break;
164   case llvm::Triple::armeb:
165   case llvm::Triple::thumbeb:
166     arm::appendBE8LinkFlag(Args, CmdArgs, ToolChain.getEffectiveTriple());
167     CmdArgs.push_back("-m");
168     switch (ToolChain.getTriple().getEnvironment()) {
169     case llvm::Triple::EABI:
170     case llvm::Triple::GNUEABI:
171       CmdArgs.push_back("armelfb_nbsd_eabi");
172       break;
173     case llvm::Triple::EABIHF:
174     case llvm::Triple::GNUEABIHF:
175       CmdArgs.push_back("armelfb_nbsd_eabihf");
176       break;
177     default:
178       CmdArgs.push_back("armelfb_nbsd");
179       break;
180     }
181     break;
182   case llvm::Triple::mips64:
183   case llvm::Triple::mips64el:
184     if (mips::hasMipsAbiArg(Args, "32")) {
185       CmdArgs.push_back("-m");
186       if (ToolChain.getArch() == llvm::Triple::mips64)
187         CmdArgs.push_back("elf32btsmip");
188       else
189         CmdArgs.push_back("elf32ltsmip");
190     } else if (mips::hasMipsAbiArg(Args, "64")) {
191       CmdArgs.push_back("-m");
192       if (ToolChain.getArch() == llvm::Triple::mips64)
193         CmdArgs.push_back("elf64btsmip");
194       else
195         CmdArgs.push_back("elf64ltsmip");
196     }
197     break;
198   case llvm::Triple::ppc:
199     CmdArgs.push_back("-m");
200     CmdArgs.push_back("elf32ppc_nbsd");
201     break;
202 
203   case llvm::Triple::ppc64:
204   case llvm::Triple::ppc64le:
205     CmdArgs.push_back("-m");
206     CmdArgs.push_back("elf64ppc");
207     break;
208 
209   case llvm::Triple::sparc:
210     CmdArgs.push_back("-m");
211     CmdArgs.push_back("elf32_sparc");
212     break;
213 
214   case llvm::Triple::sparcv9:
215     CmdArgs.push_back("-m");
216     CmdArgs.push_back("elf64_sparc");
217     break;
218 
219   default:
220     break;
221   }
222 
223   if (Output.isFilename()) {
224     CmdArgs.push_back("-o");
225     CmdArgs.push_back(Output.getFilename());
226   } else {
227     assert(Output.isNothing() && "Invalid output.");
228   }
229 
230   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
231     if (!Args.hasArg(options::OPT_shared)) {
232       CmdArgs.push_back(
233           Args.MakeArgString(ToolChain.GetFilePath("crt0.o")));
234     }
235     CmdArgs.push_back(
236         Args.MakeArgString(ToolChain.GetFilePath("crti.o")));
237     if (Args.hasArg(options::OPT_shared) || Args.hasArg(options::OPT_pie)) {
238       CmdArgs.push_back(
239           Args.MakeArgString(ToolChain.GetFilePath("crtbeginS.o")));
240     } else {
241       CmdArgs.push_back(
242           Args.MakeArgString(ToolChain.GetFilePath("crtbegin.o")));
243     }
244   }
245 
246   Args.AddAllArgs(CmdArgs, options::OPT_L);
247   Args.AddAllArgs(CmdArgs, options::OPT_T_Group);
248   Args.AddAllArgs(CmdArgs, options::OPT_e);
249   Args.AddAllArgs(CmdArgs, options::OPT_s);
250   Args.AddAllArgs(CmdArgs, options::OPT_t);
251   Args.AddAllArgs(CmdArgs, options::OPT_Z_Flag);
252   Args.AddAllArgs(CmdArgs, options::OPT_r);
253 
254   bool NeedsSanitizerDeps = addSanitizerRuntimes(getToolChain(), Args, CmdArgs);
255   bool NeedsXRayDeps = addXRayRuntime(ToolChain, Args, CmdArgs);
256   AddLinkerInputs(getToolChain(), Inputs, Args, CmdArgs, JA);
257 
258   const SanitizerArgs &SanArgs = ToolChain.getSanitizerArgs();
259   if (SanArgs.needsSharedRt()) {
260     CmdArgs.push_back("-rpath");
261     CmdArgs.push_back(Args.MakeArgString(
262         ToolChain.getCompilerRTPath().c_str()));
263   }
264 
265   unsigned Major, Minor, Micro;
266   ToolChain.getTriple().getOSVersion(Major, Minor, Micro);
267   bool useLibgcc = true;
268   if (Major >= 7 || Major == 0) {
269     switch (ToolChain.getArch()) {
270     case llvm::Triple::aarch64:
271     case llvm::Triple::aarch64_be:
272     case llvm::Triple::arm:
273     case llvm::Triple::armeb:
274     case llvm::Triple::thumb:
275     case llvm::Triple::thumbeb:
276     case llvm::Triple::ppc:
277     case llvm::Triple::ppc64:
278     case llvm::Triple::ppc64le:
279     case llvm::Triple::sparc:
280     case llvm::Triple::sparcv9:
281     case llvm::Triple::x86:
282     case llvm::Triple::x86_64:
283       useLibgcc = false;
284       break;
285     default:
286       break;
287     }
288   }
289 
290   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
291     addOpenMPRuntime(CmdArgs, getToolChain(), Args);
292     if (D.CCCIsCXX()) {
293       if (ToolChain.ShouldLinkCXXStdlib(Args))
294         ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
295       CmdArgs.push_back("-lm");
296     }
297     if (NeedsSanitizerDeps)
298       linkSanitizerRuntimeDeps(getToolChain(), CmdArgs);
299     if (NeedsXRayDeps)
300       linkXRayRuntimeDeps(ToolChain, CmdArgs);
301     if (Args.hasArg(options::OPT_pthread))
302       CmdArgs.push_back("-lpthread");
303     CmdArgs.push_back("-lc");
304 
305     if (useLibgcc) {
306       if (Args.hasArg(options::OPT_static)) {
307         // libgcc_eh depends on libc, so resolve as much as possible,
308         // pull in any new requirements from libc and then get the rest
309         // of libgcc.
310         CmdArgs.push_back("-lgcc_eh");
311         CmdArgs.push_back("-lc");
312         CmdArgs.push_back("-lgcc");
313       } else {
314         CmdArgs.push_back("-lgcc");
315         CmdArgs.push_back("--as-needed");
316         CmdArgs.push_back("-lgcc_s");
317         CmdArgs.push_back("--no-as-needed");
318       }
319     }
320   }
321 
322   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
323     if (Args.hasArg(options::OPT_shared) || Args.hasArg(options::OPT_pie))
324       CmdArgs.push_back(
325           Args.MakeArgString(ToolChain.GetFilePath("crtendS.o")));
326     else
327       CmdArgs.push_back(
328           Args.MakeArgString(ToolChain.GetFilePath("crtend.o")));
329     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtn.o")));
330   }
331 
332   ToolChain.addProfileRTLibs(Args, CmdArgs);
333 
334   const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
335   C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
336 }
337 
338 /// NetBSD - NetBSD tool chain which can call as(1) and ld(1) directly.
339 
340 NetBSD::NetBSD(const Driver &D, const llvm::Triple &Triple, const ArgList &Args)
341     : Generic_ELF(D, Triple, Args) {
342   if (!Args.hasArg(options::OPT_nostdlib)) {
343     // When targeting a 32-bit platform, try the special directory used on
344     // 64-bit hosts, and only fall back to the main library directory if that
345     // doesn't work.
346     // FIXME: It'd be nicer to test if this directory exists, but I'm not sure
347     // what all logic is needed to emulate the '=' prefix here.
348     switch (Triple.getArch()) {
349     case llvm::Triple::x86:
350       getFilePaths().push_back("=/usr/lib/i386");
351       break;
352     case llvm::Triple::arm:
353     case llvm::Triple::armeb:
354     case llvm::Triple::thumb:
355     case llvm::Triple::thumbeb:
356       switch (Triple.getEnvironment()) {
357       case llvm::Triple::EABI:
358       case llvm::Triple::GNUEABI:
359         getFilePaths().push_back("=/usr/lib/eabi");
360         break;
361       case llvm::Triple::EABIHF:
362       case llvm::Triple::GNUEABIHF:
363         getFilePaths().push_back("=/usr/lib/eabihf");
364         break;
365       default:
366         getFilePaths().push_back("=/usr/lib/oabi");
367         break;
368       }
369       break;
370     case llvm::Triple::mips64:
371     case llvm::Triple::mips64el:
372       if (tools::mips::hasMipsAbiArg(Args, "o32"))
373         getFilePaths().push_back("=/usr/lib/o32");
374       else if (tools::mips::hasMipsAbiArg(Args, "64"))
375         getFilePaths().push_back("=/usr/lib/64");
376       break;
377     case llvm::Triple::ppc:
378       getFilePaths().push_back("=/usr/lib/powerpc");
379       break;
380     case llvm::Triple::sparc:
381       getFilePaths().push_back("=/usr/lib/sparc");
382       break;
383     default:
384       break;
385     }
386 
387     getFilePaths().push_back("=/usr/lib");
388   }
389 }
390 
391 Tool *NetBSD::buildAssembler() const {
392   return new tools::netbsd::Assembler(*this);
393 }
394 
395 Tool *NetBSD::buildLinker() const { return new tools::netbsd::Linker(*this); }
396 
397 ToolChain::CXXStdlibType NetBSD::GetDefaultCXXStdlibType() const {
398   unsigned Major, Minor, Micro;
399   getTriple().getOSVersion(Major, Minor, Micro);
400   if (Major >= 7 || Major == 0) {
401     switch (getArch()) {
402     case llvm::Triple::aarch64:
403     case llvm::Triple::aarch64_be:
404     case llvm::Triple::arm:
405     case llvm::Triple::armeb:
406     case llvm::Triple::thumb:
407     case llvm::Triple::thumbeb:
408     case llvm::Triple::ppc:
409     case llvm::Triple::ppc64:
410     case llvm::Triple::ppc64le:
411     case llvm::Triple::sparc:
412     case llvm::Triple::sparcv9:
413     case llvm::Triple::x86:
414     case llvm::Triple::x86_64:
415       return ToolChain::CST_Libcxx;
416     default:
417       break;
418     }
419   }
420   return ToolChain::CST_Libstdcxx;
421 }
422 
423 void NetBSD::addLibCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
424                                    llvm::opt::ArgStringList &CC1Args) const {
425   addSystemInclude(DriverArgs, CC1Args,
426                    getDriver().SysRoot + "/usr/include/c++/");
427 }
428 
429 void NetBSD::addLibStdCxxIncludePaths(const llvm::opt::ArgList &DriverArgs,
430                                       llvm::opt::ArgStringList &CC1Args) const {
431   addLibStdCXXIncludePaths(getDriver().SysRoot, "/usr/include/g++", "", "", "",
432                            "", DriverArgs, CC1Args);
433 }
434 
435 llvm::ExceptionHandling NetBSD::GetExceptionModel(const ArgList &Args) const {
436   // NetBSD uses Dwarf exceptions on ARM.
437   llvm::Triple::ArchType TArch = getTriple().getArch();
438   if (TArch == llvm::Triple::arm || TArch == llvm::Triple::armeb ||
439       TArch == llvm::Triple::thumb || TArch == llvm::Triple::thumbeb)
440     return llvm::ExceptionHandling::DwarfCFI;
441   return llvm::ExceptionHandling::None;
442 }
443 
444 SanitizerMask NetBSD::getSupportedSanitizers() const {
445   const bool IsX86 = getTriple().getArch() == llvm::Triple::x86;
446   const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64;
447   SanitizerMask Res = ToolChain::getSupportedSanitizers();
448   if (IsX86 || IsX86_64) {
449     Res |= SanitizerKind::Address;
450     Res |= SanitizerKind::Function;
451     Res |= SanitizerKind::Leak;
452     Res |= SanitizerKind::SafeStack;
453     Res |= SanitizerKind::Scudo;
454     Res |= SanitizerKind::Vptr;
455   }
456   if (IsX86_64) {
457     Res |= SanitizerKind::DataFlow;
458     Res |= SanitizerKind::Efficiency;
459     Res |= SanitizerKind::Fuzzer;
460     Res |= SanitizerKind::FuzzerNoLink;
461     Res |= SanitizerKind::HWAddress;
462     Res |= SanitizerKind::KernelAddress;
463     Res |= SanitizerKind::KernelHWAddress;
464     Res |= SanitizerKind::KernelMemory;
465     Res |= SanitizerKind::Memory;
466     Res |= SanitizerKind::Thread;
467   }
468   return Res;
469 }
470 
471 void NetBSD::addClangTargetOptions(const ArgList &,
472                                    ArgStringList &CC1Args,
473                                    Action::OffloadKind) const {
474   const SanitizerArgs &SanArgs = getSanitizerArgs();
475   if (SanArgs.hasAnySanitizer())
476     CC1Args.push_back("-D_REENTRANT");
477 }
478