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().getArch() == llvm::Triple::mips64)
72       CmdArgs.push_back("-EB");
73     else
74       CmdArgs.push_back("-EL");
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 (getToolChain().getArch() == llvm::Triple::mips64)
115     CmdArgs.push_back("-EB");
116   else if (getToolChain().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))
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     if (!Args.hasArg(options::OPT_shared)) {
153       if (Args.hasArg(options::OPT_pg))
154         CmdArgs.push_back(
155             Args.MakeArgString(getToolChain().GetFilePath("gcrt0.o")));
156       else if (Args.hasArg(options::OPT_static) &&
157                !Args.hasArg(options::OPT_nopie))
158         CmdArgs.push_back(
159             Args.MakeArgString(getToolChain().GetFilePath("rcrt0.o")));
160       else
161         CmdArgs.push_back(
162             Args.MakeArgString(getToolChain().GetFilePath("crt0.o")));
163       CmdArgs.push_back(
164           Args.MakeArgString(getToolChain().GetFilePath("crtbegin.o")));
165     } else {
166       CmdArgs.push_back(
167           Args.MakeArgString(getToolChain().GetFilePath("crtbeginS.o")));
168     }
169   }
170 
171   std::string Triple = getToolChain().getTripleString();
172   if (Triple.substr(0, 6) == "x86_64")
173     Triple.replace(0, 6, "amd64");
174   CmdArgs.push_back(
175       Args.MakeArgString("-L/usr/lib/gcc-lib/" + Triple + "/4.2.1"));
176   CmdArgs.push_back(Args.MakeArgString("-L/usr/lib"));
177 
178   Args.AddAllArgs(CmdArgs, {options::OPT_L, options::OPT_T_Group,
179                             options::OPT_e, options::OPT_s, options::OPT_t,
180                             options::OPT_Z_Flag, options::OPT_r});
181 
182   bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs);
183   AddLinkerInputs(getToolChain(), Inputs, Args, CmdArgs, JA);
184 
185   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
186     if (D.CCCIsCXX()) {
187       if (getToolChain().ShouldLinkCXXStdlib(Args))
188         getToolChain().AddCXXStdlibLibArgs(Args, CmdArgs);
189       if (Args.hasArg(options::OPT_pg))
190         CmdArgs.push_back("-lm_p");
191       else
192         CmdArgs.push_back("-lm");
193     }
194     if (NeedsSanitizerDeps) {
195       CmdArgs.push_back(ToolChain.getCompilerRTArgString(Args, "builtins", false));
196       linkSanitizerRuntimeDeps(ToolChain, CmdArgs);
197     }
198     // FIXME: For some reason GCC passes -lgcc before adding
199     // the default system libraries. Just mimic this for now.
200     CmdArgs.push_back("-lgcc");
201 
202     if (Args.hasArg(options::OPT_pthread)) {
203       if (!Args.hasArg(options::OPT_shared) && Args.hasArg(options::OPT_pg))
204         CmdArgs.push_back("-lpthread_p");
205       else
206         CmdArgs.push_back("-lpthread");
207     }
208 
209     if (!Args.hasArg(options::OPT_shared)) {
210       if (Args.hasArg(options::OPT_pg))
211         CmdArgs.push_back("-lc_p");
212       else
213         CmdArgs.push_back("-lc");
214     }
215 
216     CmdArgs.push_back("-lgcc");
217   }
218 
219   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
220     if (!Args.hasArg(options::OPT_shared))
221       CmdArgs.push_back(
222           Args.MakeArgString(getToolChain().GetFilePath("crtend.o")));
223     else
224       CmdArgs.push_back(
225           Args.MakeArgString(getToolChain().GetFilePath("crtendS.o")));
226   }
227 
228   const char *Exec = Args.MakeArgString(getToolChain().GetLinkerPath());
229   C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
230 }
231 
232 SanitizerMask OpenBSD::getSupportedSanitizers() const {
233   const bool IsX86 = getTriple().getArch() == llvm::Triple::x86;
234   const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64;
235 
236   // For future use, only UBsan at the moment
237   SanitizerMask Res = ToolChain::getSupportedSanitizers();
238 
239   if (IsX86 || IsX86_64)
240     Res |= SanitizerKind::Vptr;
241 
242   return Res;
243 }
244 
245 /// OpenBSD - OpenBSD tool chain which can call as(1) and ld(1) directly.
246 
247 OpenBSD::OpenBSD(const Driver &D, const llvm::Triple &Triple,
248                  const ArgList &Args)
249     : Generic_ELF(D, Triple, Args) {
250   getFilePaths().push_back(getDriver().Dir + "/../lib");
251   getFilePaths().push_back("/usr/lib");
252 }
253 
254 Tool *OpenBSD::buildAssembler() const {
255   return new tools::openbsd::Assembler(*this);
256 }
257 
258 Tool *OpenBSD::buildLinker() const { return new tools::openbsd::Linker(*this); }
259