1 //===--- FreeBSD.cpp - FreeBSD ToolChain Implementations --------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "FreeBSD.h"
11 #include "Arch/ARM.h"
12 #include "Arch/Mips.h"
13 #include "Arch/Sparc.h"
14 #include "CommonArgs.h"
15 #include "clang/Basic/VirtualFileSystem.h"
16 #include "clang/Driver/Compilation.h"
17 #include "clang/Driver/Options.h"
18 #include "clang/Driver/SanitizerArgs.h"
19 #include "llvm/Option/ArgList.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 freebsd::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   claimNoWarnArgs(Args);
33   ArgStringList CmdArgs;
34 
35   // When building 32-bit code on FreeBSD/amd64, we have to explicitly
36   // instruct as in the base system to assemble 32-bit code.
37   switch (getToolChain().getArch()) {
38   default:
39     break;
40   case llvm::Triple::x86:
41     CmdArgs.push_back("--32");
42     break;
43   case llvm::Triple::ppc:
44     CmdArgs.push_back("-a32");
45     break;
46   case llvm::Triple::mips:
47   case llvm::Triple::mipsel:
48   case llvm::Triple::mips64:
49   case llvm::Triple::mips64el: {
50     StringRef CPUName;
51     StringRef ABIName;
52     mips::getMipsCPUAndABI(Args, getToolChain().getTriple(), CPUName, ABIName);
53 
54     CmdArgs.push_back("-march");
55     CmdArgs.push_back(CPUName.data());
56 
57     CmdArgs.push_back("-mabi");
58     CmdArgs.push_back(mips::getGnuCompatibleMipsABIName(ABIName).data());
59 
60     if (getToolChain().getArch() == llvm::Triple::mips ||
61         getToolChain().getArch() == llvm::Triple::mips64)
62       CmdArgs.push_back("-EB");
63     else
64       CmdArgs.push_back("-EL");
65 
66     if (Arg *A = Args.getLastArg(options::OPT_G)) {
67       StringRef v = A->getValue();
68       CmdArgs.push_back(Args.MakeArgString("-G" + v));
69       A->claim();
70     }
71 
72     AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
73     break;
74   }
75   case llvm::Triple::arm:
76   case llvm::Triple::armeb:
77   case llvm::Triple::thumb:
78   case llvm::Triple::thumbeb: {
79     arm::FloatABI ABI = arm::getARMFloatABI(getToolChain(), Args);
80 
81     if (ABI == arm::FloatABI::Hard)
82       CmdArgs.push_back("-mfpu=vfp");
83     else
84       CmdArgs.push_back("-mfpu=softvfp");
85 
86     switch (getToolChain().getTriple().getEnvironment()) {
87     case llvm::Triple::GNUEABIHF:
88     case llvm::Triple::GNUEABI:
89     case llvm::Triple::EABI:
90       CmdArgs.push_back("-meabi=5");
91       break;
92 
93     default:
94       CmdArgs.push_back("-matpcs");
95     }
96     break;
97   }
98   case llvm::Triple::sparc:
99   case llvm::Triple::sparcel:
100   case llvm::Triple::sparcv9: {
101     std::string CPU = getCPUName(Args, getToolChain().getTriple());
102     CmdArgs.push_back(sparc::getSparcAsmModeForCPU(CPU, getToolChain().getTriple()));
103     AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
104     break;
105   }
106   }
107 
108   Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
109 
110   CmdArgs.push_back("-o");
111   CmdArgs.push_back(Output.getFilename());
112 
113   for (const auto &II : Inputs)
114     CmdArgs.push_back(II.getFilename());
115 
116   const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath("as"));
117   C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
118 }
119 
120 void freebsd::Linker::ConstructJob(Compilation &C, const JobAction &JA,
121                                    const InputInfo &Output,
122                                    const InputInfoList &Inputs,
123                                    const ArgList &Args,
124                                    const char *LinkingOutput) const {
125   const toolchains::FreeBSD &ToolChain =
126       static_cast<const toolchains::FreeBSD &>(getToolChain());
127   const Driver &D = ToolChain.getDriver();
128   const llvm::Triple::ArchType Arch = ToolChain.getArch();
129   const bool IsPIE =
130       !Args.hasArg(options::OPT_shared) &&
131       (Args.hasArg(options::OPT_pie) || ToolChain.isPIEDefault());
132   ArgStringList CmdArgs;
133 
134   // Silence warning for "clang -g foo.o -o foo"
135   Args.ClaimAllArgs(options::OPT_g_Group);
136   // and "clang -emit-llvm foo.o -o foo"
137   Args.ClaimAllArgs(options::OPT_emit_llvm);
138   // and for "clang -w foo.o -o foo". Other warning options are already
139   // handled somewhere else.
140   Args.ClaimAllArgs(options::OPT_w);
141 
142   if (!D.SysRoot.empty())
143     CmdArgs.push_back(Args.MakeArgString("--sysroot=" + D.SysRoot));
144 
145   if (IsPIE)
146     CmdArgs.push_back("-pie");
147 
148   CmdArgs.push_back("--eh-frame-hdr");
149   if (Args.hasArg(options::OPT_static)) {
150     CmdArgs.push_back("-Bstatic");
151   } else {
152     if (Args.hasArg(options::OPT_rdynamic))
153       CmdArgs.push_back("-export-dynamic");
154     if (Args.hasArg(options::OPT_shared)) {
155       CmdArgs.push_back("-Bshareable");
156     } else {
157       CmdArgs.push_back("-dynamic-linker");
158       CmdArgs.push_back("/libexec/ld-elf.so.1");
159     }
160     if (ToolChain.getTriple().getOSMajorVersion() >= 9) {
161       if (Arch == llvm::Triple::arm || Arch == llvm::Triple::sparc ||
162           Arch == llvm::Triple::x86 || Arch == llvm::Triple::x86_64) {
163         CmdArgs.push_back("--hash-style=both");
164       }
165     }
166     CmdArgs.push_back("--enable-new-dtags");
167   }
168 
169   // When building 32-bit code on FreeBSD/amd64, we have to explicitly
170   // instruct ld in the base system to link 32-bit code.
171   if (Arch == llvm::Triple::x86) {
172     CmdArgs.push_back("-m");
173     CmdArgs.push_back("elf_i386_fbsd");
174   }
175 
176   if (Arch == llvm::Triple::ppc) {
177     CmdArgs.push_back("-m");
178     CmdArgs.push_back("elf32ppc_fbsd");
179   }
180 
181   if (Arg *A = Args.getLastArg(options::OPT_G)) {
182     if (ToolChain.getArch() == llvm::Triple::mips ||
183       ToolChain.getArch() == llvm::Triple::mipsel ||
184       ToolChain.getArch() == llvm::Triple::mips64 ||
185       ToolChain.getArch() == llvm::Triple::mips64el) {
186       StringRef v = A->getValue();
187       CmdArgs.push_back(Args.MakeArgString("-G" + v));
188       A->claim();
189     }
190   }
191 
192   if (Output.isFilename()) {
193     CmdArgs.push_back("-o");
194     CmdArgs.push_back(Output.getFilename());
195   } else {
196     assert(Output.isNothing() && "Invalid output.");
197   }
198 
199   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
200     const char *crt1 = nullptr;
201     if (!Args.hasArg(options::OPT_shared)) {
202       if (Args.hasArg(options::OPT_pg))
203         crt1 = "gcrt1.o";
204       else if (IsPIE)
205         crt1 = "Scrt1.o";
206       else
207         crt1 = "crt1.o";
208     }
209     if (crt1)
210       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crt1)));
211 
212     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crti.o")));
213 
214     const char *crtbegin = nullptr;
215     if (Args.hasArg(options::OPT_static))
216       crtbegin = "crtbeginT.o";
217     else if (Args.hasArg(options::OPT_shared) || IsPIE)
218       crtbegin = "crtbeginS.o";
219     else
220       crtbegin = "crtbegin.o";
221 
222     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
223   }
224 
225   Args.AddAllArgs(CmdArgs, options::OPT_L);
226   ToolChain.AddFilePathLibArgs(Args, CmdArgs);
227   Args.AddAllArgs(CmdArgs, options::OPT_T_Group);
228   Args.AddAllArgs(CmdArgs, options::OPT_e);
229   Args.AddAllArgs(CmdArgs, options::OPT_s);
230   Args.AddAllArgs(CmdArgs, options::OPT_t);
231   Args.AddAllArgs(CmdArgs, options::OPT_Z_Flag);
232   Args.AddAllArgs(CmdArgs, options::OPT_r);
233 
234   if (D.isUsingLTO())
235     AddGoldPlugin(ToolChain, Args, CmdArgs, D.getLTOMode() == LTOK_Thin, D);
236 
237   bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs);
238   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
239 
240   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
241     addOpenMPRuntime(CmdArgs, ToolChain, Args);
242     if (D.CCCIsCXX()) {
243       if (ToolChain.ShouldLinkCXXStdlib(Args))
244         ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
245       if (Args.hasArg(options::OPT_pg))
246         CmdArgs.push_back("-lm_p");
247       else
248         CmdArgs.push_back("-lm");
249     }
250     if (NeedsSanitizerDeps)
251       linkSanitizerRuntimeDeps(ToolChain, CmdArgs);
252     // FIXME: For some reason GCC passes -lgcc and -lgcc_s before adding
253     // the default system libraries. Just mimic this for now.
254     if (Args.hasArg(options::OPT_pg))
255       CmdArgs.push_back("-lgcc_p");
256     else
257       CmdArgs.push_back("-lgcc");
258     if (Args.hasArg(options::OPT_static)) {
259       CmdArgs.push_back("-lgcc_eh");
260     } else if (Args.hasArg(options::OPT_pg)) {
261       CmdArgs.push_back("-lgcc_eh_p");
262     } else {
263       CmdArgs.push_back("--as-needed");
264       CmdArgs.push_back("-lgcc_s");
265       CmdArgs.push_back("--no-as-needed");
266     }
267 
268     if (Args.hasArg(options::OPT_pthread)) {
269       if (Args.hasArg(options::OPT_pg))
270         CmdArgs.push_back("-lpthread_p");
271       else
272         CmdArgs.push_back("-lpthread");
273     }
274 
275     if (Args.hasArg(options::OPT_pg)) {
276       if (Args.hasArg(options::OPT_shared))
277         CmdArgs.push_back("-lc");
278       else
279         CmdArgs.push_back("-lc_p");
280       CmdArgs.push_back("-lgcc_p");
281     } else {
282       CmdArgs.push_back("-lc");
283       CmdArgs.push_back("-lgcc");
284     }
285 
286     if (Args.hasArg(options::OPT_static)) {
287       CmdArgs.push_back("-lgcc_eh");
288     } else if (Args.hasArg(options::OPT_pg)) {
289       CmdArgs.push_back("-lgcc_eh_p");
290     } else {
291       CmdArgs.push_back("--as-needed");
292       CmdArgs.push_back("-lgcc_s");
293       CmdArgs.push_back("--no-as-needed");
294     }
295   }
296 
297   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
298     if (Args.hasArg(options::OPT_shared) || IsPIE)
299       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtendS.o")));
300     else
301       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtend.o")));
302     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath("crtn.o")));
303   }
304 
305   ToolChain.addProfileRTLibs(Args, CmdArgs);
306 
307   const char *Exec = Args.MakeArgString(getToolChain().GetLinkerPath());
308   C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
309 }
310 
311 /// FreeBSD - FreeBSD tool chain which can call as(1) and ld(1) directly.
312 
313 FreeBSD::FreeBSD(const Driver &D, const llvm::Triple &Triple,
314                  const ArgList &Args)
315     : Generic_ELF(D, Triple, Args) {
316 
317   // When targeting 32-bit platforms, look for '/usr/lib32/crt1.o' and fall
318   // back to '/usr/lib' if it doesn't exist.
319   if ((Triple.getArch() == llvm::Triple::x86 ||
320        Triple.getArch() == llvm::Triple::ppc) &&
321       D.getVFS().exists(getDriver().SysRoot + "/usr/lib32/crt1.o"))
322     getFilePaths().push_back(getDriver().SysRoot + "/usr/lib32");
323   else
324     getFilePaths().push_back(getDriver().SysRoot + "/usr/lib");
325 }
326 
327 ToolChain::CXXStdlibType FreeBSD::GetDefaultCXXStdlibType() const {
328   if (getTriple().getOSMajorVersion() >= 10)
329     return ToolChain::CST_Libcxx;
330   return ToolChain::CST_Libstdcxx;
331 }
332 
333 void FreeBSD::addLibStdCxxIncludePaths(
334     const llvm::opt::ArgList &DriverArgs,
335     llvm::opt::ArgStringList &CC1Args) const {
336   addLibStdCXXIncludePaths(getDriver().SysRoot, "/usr/include/c++/4.2", "", "",
337                            "", "", DriverArgs, CC1Args);
338 }
339 
340 void FreeBSD::AddCXXStdlibLibArgs(const ArgList &Args,
341                                   ArgStringList &CmdArgs) const {
342   CXXStdlibType Type = GetCXXStdlibType(Args);
343   bool Profiling = Args.hasArg(options::OPT_pg);
344 
345   switch (Type) {
346   case ToolChain::CST_Libcxx:
347     CmdArgs.push_back(Profiling ? "-lc++_p" : "-lc++");
348     break;
349 
350   case ToolChain::CST_Libstdcxx:
351     CmdArgs.push_back(Profiling ? "-lstdc++_p" : "-lstdc++");
352     break;
353   }
354 }
355 
356 Tool *FreeBSD::buildAssembler() const {
357   return new tools::freebsd::Assembler(*this);
358 }
359 
360 Tool *FreeBSD::buildLinker() const { return new tools::freebsd::Linker(*this); }
361 
362 llvm::ExceptionHandling FreeBSD::GetExceptionModel(const ArgList &Args) const {
363   // FreeBSD uses SjLj exceptions on ARM oabi.
364   switch (getTriple().getEnvironment()) {
365   case llvm::Triple::GNUEABIHF:
366   case llvm::Triple::GNUEABI:
367   case llvm::Triple::EABI:
368     return llvm::ExceptionHandling::None;
369   default:
370     if (getTriple().getArch() == llvm::Triple::arm ||
371         getTriple().getArch() == llvm::Triple::thumb)
372       return llvm::ExceptionHandling::SjLj;
373     return llvm::ExceptionHandling::None;
374   }
375 }
376 
377 bool FreeBSD::HasNativeLLVMSupport() const { return true; }
378 
379 bool FreeBSD::isPIEDefault() const { return getSanitizerArgs().requiresPIE(); }
380 
381 SanitizerMask FreeBSD::getSupportedSanitizers() const {
382   const bool IsX86 = getTriple().getArch() == llvm::Triple::x86;
383   const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64;
384   const bool IsMIPS64 = getTriple().getArch() == llvm::Triple::mips64 ||
385                         getTriple().getArch() == llvm::Triple::mips64el;
386   SanitizerMask Res = ToolChain::getSupportedSanitizers();
387   Res |= SanitizerKind::Address;
388   Res |= SanitizerKind::Vptr;
389   if (IsX86_64 || IsMIPS64) {
390     Res |= SanitizerKind::Leak;
391     Res |= SanitizerKind::Thread;
392   }
393   if (IsX86 || IsX86_64) {
394     Res |= SanitizerKind::SafeStack;
395   }
396   return Res;
397 }
398