1 //===--- OpenBSD.cpp - OpenBSD 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 "OpenBSD.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/Options.h"
16 #include "clang/Driver/SanitizerArgs.h"
17 #include "llvm/Option/ArgList.h"
18 
19 using namespace clang::driver;
20 using namespace clang::driver::tools;
21 using namespace clang::driver::toolchains;
22 using namespace clang;
23 using namespace llvm::opt;
24 
25 void openbsd::Assembler::ConstructJob(Compilation &C, const JobAction &JA,
26                                       const InputInfo &Output,
27                                       const InputInfoList &Inputs,
28                                       const ArgList &Args,
29                                       const char *LinkingOutput) const {
30   claimNoWarnArgs(Args);
31   ArgStringList CmdArgs;
32 
33   switch (getToolChain().getArch()) {
34   case llvm::Triple::x86:
35     // When building 32-bit code on OpenBSD/amd64, we have to explicitly
36     // instruct as in the base system to assemble 32-bit code.
37     CmdArgs.push_back("--32");
38     break;
39 
40   case llvm::Triple::ppc:
41     CmdArgs.push_back("-mppc");
42     CmdArgs.push_back("-many");
43     break;
44 
45   case llvm::Triple::sparc:
46   case llvm::Triple::sparcel: {
47     CmdArgs.push_back("-32");
48     std::string CPU = getCPUName(Args, getToolChain().getTriple());
49     CmdArgs.push_back(sparc::getSparcAsmModeForCPU(CPU, getToolChain().getTriple()));
50     AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
51     break;
52   }
53 
54   case llvm::Triple::sparcv9: {
55     CmdArgs.push_back("-64");
56     std::string CPU = getCPUName(Args, getToolChain().getTriple());
57     CmdArgs.push_back(sparc::getSparcAsmModeForCPU(CPU, getToolChain().getTriple()));
58     AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
59     break;
60   }
61 
62   case llvm::Triple::mips64:
63   case llvm::Triple::mips64el: {
64     StringRef CPUName;
65     StringRef ABIName;
66     mips::getMipsCPUAndABI(Args, getToolChain().getTriple(), CPUName, ABIName);
67 
68     CmdArgs.push_back("-mabi");
69     CmdArgs.push_back(mips::getGnuCompatibleMipsABIName(ABIName).data());
70 
71     if (getToolChain().getTriple().isLittleEndian())
72       CmdArgs.push_back("-EL");
73     else
74       CmdArgs.push_back("-EB");
75 
76     AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
77     break;
78   }
79 
80   default:
81     break;
82   }
83 
84   Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
85 
86   CmdArgs.push_back("-o");
87   CmdArgs.push_back(Output.getFilename());
88 
89   for (const auto &II : Inputs)
90     CmdArgs.push_back(II.getFilename());
91 
92   const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath("as"));
93   C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
94 }
95 
96 void openbsd::Linker::ConstructJob(Compilation &C, const JobAction &JA,
97                                    const InputInfo &Output,
98                                    const InputInfoList &Inputs,
99                                    const ArgList &Args,
100                                    const char *LinkingOutput) const {
101   const toolchains::OpenBSD &ToolChain =
102       static_cast<const toolchains::OpenBSD &>(getToolChain());
103   const Driver &D = getToolChain().getDriver();
104   ArgStringList CmdArgs;
105 
106   // Silence warning for "clang -g foo.o -o foo"
107   Args.ClaimAllArgs(options::OPT_g_Group);
108   // and "clang -emit-llvm foo.o -o foo"
109   Args.ClaimAllArgs(options::OPT_emit_llvm);
110   // and for "clang -w foo.o -o foo". Other warning options are already
111   // handled somewhere else.
112   Args.ClaimAllArgs(options::OPT_w);
113 
114   if (ToolChain.getArch() == llvm::Triple::mips64)
115     CmdArgs.push_back("-EB");
116   else if (ToolChain.getArch() == llvm::Triple::mips64el)
117     CmdArgs.push_back("-EL");
118 
119   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_shared)) {
120     CmdArgs.push_back("-e");
121     CmdArgs.push_back("__start");
122   }
123 
124   CmdArgs.push_back("--eh-frame-hdr");
125   if (Args.hasArg(options::OPT_static)) {
126     CmdArgs.push_back("-Bstatic");
127   } else {
128     if (Args.hasArg(options::OPT_rdynamic))
129       CmdArgs.push_back("-export-dynamic");
130     CmdArgs.push_back("-Bdynamic");
131     if (Args.hasArg(options::OPT_shared)) {
132       CmdArgs.push_back("-shared");
133     } else {
134       CmdArgs.push_back("-dynamic-linker");
135       CmdArgs.push_back("/usr/libexec/ld.so");
136     }
137   }
138 
139   if (Args.hasArg(options::OPT_pie))
140     CmdArgs.push_back("-pie");
141   if (Args.hasArg(options::OPT_nopie) || Args.hasArg(options::OPT_pg))
142     CmdArgs.push_back("-nopie");
143 
144   if (Output.isFilename()) {
145     CmdArgs.push_back("-o");
146     CmdArgs.push_back(Output.getFilename());
147   } else {
148     assert(Output.isNothing() && "Invalid output.");
149   }
150 
151   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
152     const char *crt0 = nullptr;
153     const char *crtbegin = nullptr;
154     if (!Args.hasArg(options::OPT_shared)) {
155       if (Args.hasArg(options::OPT_pg))
156         crt0 = "gcrt0.o";
157       else if (Args.hasArg(options::OPT_static) &&
158                !Args.hasArg(options::OPT_nopie))
159         crt0 = "rcrt0.o";
160       else
161         crt0 = "crt0.o";
162       crtbegin = "crtbegin.o";
163     } else {
164       crtbegin = "crtbeginS.o";
165     }
166 
167     if (crt0)
168       CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crt0)));
169     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
170   }
171 
172   Args.AddAllArgs(CmdArgs, options::OPT_L);
173   ToolChain.AddFilePathLibArgs(Args, CmdArgs);
174   Args.AddAllArgs(CmdArgs, {options::OPT_T_Group, options::OPT_e,
175                             options::OPT_s, options::OPT_t,
176                             options::OPT_Z_Flag, options::OPT_r});
177 
178   bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs);
179   bool NeedsXRayDeps = addXRayRuntime(ToolChain, Args, CmdArgs);
180   AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
181 
182   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
183     if (D.CCCIsCXX()) {
184       if (ToolChain.ShouldLinkCXXStdlib(Args))
185         ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
186       if (Args.hasArg(options::OPT_pg))
187         CmdArgs.push_back("-lm_p");
188       else
189         CmdArgs.push_back("-lm");
190     }
191     if (NeedsSanitizerDeps) {
192       CmdArgs.push_back(ToolChain.getCompilerRTArgString(Args, "builtins", false));
193       linkSanitizerRuntimeDeps(ToolChain, CmdArgs);
194     }
195     if (NeedsXRayDeps) {
196       CmdArgs.push_back(ToolChain.getCompilerRTArgString(Args, "builtins", false));
197       linkXRayRuntimeDeps(ToolChain, CmdArgs);
198     }
199     // FIXME: For some reason GCC passes -lgcc before adding
200     // the default system libraries. Just mimic this for now.
201     CmdArgs.push_back("-lcompiler_rt");
202 
203     if (Args.hasArg(options::OPT_pthread)) {
204       if (!Args.hasArg(options::OPT_shared) && Args.hasArg(options::OPT_pg))
205         CmdArgs.push_back("-lpthread_p");
206       else
207         CmdArgs.push_back("-lpthread");
208     }
209 
210     if (!Args.hasArg(options::OPT_shared)) {
211       if (Args.hasArg(options::OPT_pg))
212         CmdArgs.push_back("-lc_p");
213       else
214         CmdArgs.push_back("-lc");
215     }
216 
217     CmdArgs.push_back("-lcompiler_rt");
218   }
219 
220   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
221     const char *crtend = nullptr;
222     if (!Args.hasArg(options::OPT_shared))
223       crtend = "crtend.o";
224     else
225       crtend = "crtendS.o";
226 
227     CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend)));
228   }
229 
230   const char *Exec = Args.MakeArgString(
231       !NeedsSanitizerDeps ? ToolChain.GetLinkerPath()
232                           : ToolChain.GetProgramPath("ld.lld"));
233   C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
234 }
235 
236 SanitizerMask OpenBSD::getSupportedSanitizers() const {
237   const bool IsX86 = getTriple().getArch() == llvm::Triple::x86;
238   const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64;
239 
240   // For future use, only UBsan at the moment
241   SanitizerMask Res = ToolChain::getSupportedSanitizers();
242 
243   if (IsX86 || IsX86_64) {
244     Res |= SanitizerKind::Vptr;
245     Res |= SanitizerKind::Fuzzer;
246     Res |= SanitizerKind::FuzzerNoLink;
247   }
248 
249   return Res;
250 }
251 
252 /// OpenBSD - OpenBSD tool chain which can call as(1) and ld(1) directly.
253 
254 OpenBSD::OpenBSD(const Driver &D, const llvm::Triple &Triple,
255                  const ArgList &Args)
256     : Generic_ELF(D, Triple, Args) {
257   getFilePaths().push_back(getDriver().SysRoot + "/usr/lib");
258 }
259 
260 void OpenBSD::AddCXXStdlibLibArgs(const ArgList &Args,
261                                   ArgStringList &CmdArgs) const {
262   bool Profiling = Args.hasArg(options::OPT_pg);
263 
264   CmdArgs.push_back(Profiling ? "-lc++_p" : "-lc++");
265   CmdArgs.push_back(Profiling ? "-lc++abi_p" : "-lc++abi");
266 }
267 
268 Tool *OpenBSD::buildAssembler() const {
269   return new tools::openbsd::Assembler(*this);
270 }
271 
272 Tool *OpenBSD::buildLinker() const { return new tools::openbsd::Linker(*this); }
273