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 "llvm/Option/ArgList.h"
17 
18 using namespace clang::driver;
19 using namespace clang::driver::tools;
20 using namespace clang::driver::toolchains;
21 using namespace clang;
22 using namespace llvm::opt;
23 
24 void openbsd::Assembler::ConstructJob(Compilation &C, const JobAction &JA,
25                                       const InputInfo &Output,
26                                       const InputInfoList &Inputs,
27                                       const ArgList &Args,
28                                       const char *LinkingOutput) const {
29   claimNoWarnArgs(Args);
30   ArgStringList CmdArgs;
31 
32   switch (getToolChain().getArch()) {
33   case llvm::Triple::x86:
34     // When building 32-bit code on OpenBSD/amd64, we have to explicitly
35     // instruct as in the base system to assemble 32-bit code.
36     CmdArgs.push_back("--32");
37     break;
38 
39   case llvm::Triple::ppc:
40     CmdArgs.push_back("-mppc");
41     CmdArgs.push_back("-many");
42     break;
43 
44   case llvm::Triple::sparc:
45   case llvm::Triple::sparcel: {
46     CmdArgs.push_back("-32");
47     std::string CPU = getCPUName(Args, getToolChain().getTriple());
48     CmdArgs.push_back(sparc::getSparcAsmModeForCPU(CPU, getToolChain().getTriple()));
49     AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
50     break;
51   }
52 
53   case llvm::Triple::sparcv9: {
54     CmdArgs.push_back("-64");
55     std::string CPU = getCPUName(Args, getToolChain().getTriple());
56     CmdArgs.push_back(sparc::getSparcAsmModeForCPU(CPU, getToolChain().getTriple()));
57     AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
58     break;
59   }
60 
61   case llvm::Triple::mips64:
62   case llvm::Triple::mips64el: {
63     StringRef CPUName;
64     StringRef ABIName;
65     mips::getMipsCPUAndABI(Args, getToolChain().getTriple(), CPUName, ABIName);
66 
67     CmdArgs.push_back("-mabi");
68     CmdArgs.push_back(mips::getGnuCompatibleMipsABIName(ABIName).data());
69 
70     if (getToolChain().getArch() == llvm::Triple::mips64)
71       CmdArgs.push_back("-EB");
72     else
73       CmdArgs.push_back("-EL");
74 
75     AddAssemblerKPIC(getToolChain(), Args, CmdArgs);
76     break;
77   }
78 
79   default:
80     break;
81   }
82 
83   Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA, options::OPT_Xassembler);
84 
85   CmdArgs.push_back("-o");
86   CmdArgs.push_back(Output.getFilename());
87 
88   for (const auto &II : Inputs)
89     CmdArgs.push_back(II.getFilename());
90 
91   const char *Exec = Args.MakeArgString(getToolChain().GetProgramPath("as"));
92   C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
93 }
94 
95 void openbsd::Linker::ConstructJob(Compilation &C, const JobAction &JA,
96                                    const InputInfo &Output,
97                                    const InputInfoList &Inputs,
98                                    const ArgList &Args,
99                                    const char *LinkingOutput) const {
100   const Driver &D = getToolChain().getDriver();
101   ArgStringList CmdArgs;
102 
103   // Silence warning for "clang -g foo.o -o foo"
104   Args.ClaimAllArgs(options::OPT_g_Group);
105   // and "clang -emit-llvm foo.o -o foo"
106   Args.ClaimAllArgs(options::OPT_emit_llvm);
107   // and for "clang -w foo.o -o foo". Other warning options are already
108   // handled somewhere else.
109   Args.ClaimAllArgs(options::OPT_w);
110 
111   if (getToolChain().getArch() == llvm::Triple::mips64)
112     CmdArgs.push_back("-EB");
113   else if (getToolChain().getArch() == llvm::Triple::mips64el)
114     CmdArgs.push_back("-EL");
115 
116   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_shared)) {
117     CmdArgs.push_back("-e");
118     CmdArgs.push_back("__start");
119   }
120 
121   CmdArgs.push_back("--eh-frame-hdr");
122   if (Args.hasArg(options::OPT_static)) {
123     CmdArgs.push_back("-Bstatic");
124   } else {
125     if (Args.hasArg(options::OPT_rdynamic))
126       CmdArgs.push_back("-export-dynamic");
127     CmdArgs.push_back("-Bdynamic");
128     if (Args.hasArg(options::OPT_shared)) {
129       CmdArgs.push_back("-shared");
130     } else {
131       CmdArgs.push_back("-dynamic-linker");
132       CmdArgs.push_back("/usr/libexec/ld.so");
133     }
134   }
135 
136   if (Args.hasArg(options::OPT_nopie))
137     CmdArgs.push_back("-nopie");
138 
139   if (Output.isFilename()) {
140     CmdArgs.push_back("-o");
141     CmdArgs.push_back(Output.getFilename());
142   } else {
143     assert(Output.isNothing() && "Invalid output.");
144   }
145 
146   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
147     if (!Args.hasArg(options::OPT_shared)) {
148       if (Args.hasArg(options::OPT_pg))
149         CmdArgs.push_back(
150             Args.MakeArgString(getToolChain().GetFilePath("gcrt0.o")));
151       else if (Args.hasArg(options::OPT_static) &&
152                !Args.hasArg(options::OPT_nopie))
153         CmdArgs.push_back(
154             Args.MakeArgString(getToolChain().GetFilePath("rcrt0.o")));
155       else
156         CmdArgs.push_back(
157             Args.MakeArgString(getToolChain().GetFilePath("crt0.o")));
158       CmdArgs.push_back(
159           Args.MakeArgString(getToolChain().GetFilePath("crtbegin.o")));
160     } else {
161       CmdArgs.push_back(
162           Args.MakeArgString(getToolChain().GetFilePath("crtbeginS.o")));
163     }
164   }
165 
166   std::string Triple = getToolChain().getTripleString();
167   if (Triple.substr(0, 6) == "x86_64")
168     Triple.replace(0, 6, "amd64");
169   CmdArgs.push_back(
170       Args.MakeArgString("-L/usr/lib/gcc-lib/" + Triple + "/4.2.1"));
171 
172   Args.AddAllArgs(CmdArgs, {options::OPT_L, options::OPT_T_Group,
173                             options::OPT_e, options::OPT_s, options::OPT_t,
174                             options::OPT_Z_Flag, options::OPT_r});
175 
176   AddLinkerInputs(getToolChain(), Inputs, Args, CmdArgs, JA);
177 
178   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
179     if (D.CCCIsCXX()) {
180       getToolChain().AddCXXStdlibLibArgs(Args, CmdArgs);
181       if (Args.hasArg(options::OPT_pg))
182         CmdArgs.push_back("-lm_p");
183       else
184         CmdArgs.push_back("-lm");
185     }
186 
187     // FIXME: For some reason GCC passes -lgcc before adding
188     // the default system libraries. Just mimic this for now.
189     CmdArgs.push_back("-lgcc");
190 
191     if (Args.hasArg(options::OPT_pthread)) {
192       if (!Args.hasArg(options::OPT_shared) && Args.hasArg(options::OPT_pg))
193         CmdArgs.push_back("-lpthread_p");
194       else
195         CmdArgs.push_back("-lpthread");
196     }
197 
198     if (!Args.hasArg(options::OPT_shared)) {
199       if (Args.hasArg(options::OPT_pg))
200         CmdArgs.push_back("-lc_p");
201       else
202         CmdArgs.push_back("-lc");
203     }
204 
205     CmdArgs.push_back("-lgcc");
206   }
207 
208   if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
209     if (!Args.hasArg(options::OPT_shared))
210       CmdArgs.push_back(
211           Args.MakeArgString(getToolChain().GetFilePath("crtend.o")));
212     else
213       CmdArgs.push_back(
214           Args.MakeArgString(getToolChain().GetFilePath("crtendS.o")));
215   }
216 
217   const char *Exec = Args.MakeArgString(getToolChain().GetLinkerPath());
218   C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
219 }
220 
221 /// OpenBSD - OpenBSD tool chain which can call as(1) and ld(1) directly.
222 
223 OpenBSD::OpenBSD(const Driver &D, const llvm::Triple &Triple,
224                  const ArgList &Args)
225     : Generic_ELF(D, Triple, Args) {
226   getFilePaths().push_back(getDriver().Dir + "/../lib");
227   getFilePaths().push_back("/usr/lib");
228 }
229 
230 Tool *OpenBSD::buildAssembler() const {
231   return new tools::openbsd::Assembler(*this);
232 }
233 
234 Tool *OpenBSD::buildLinker() const { return new tools::openbsd::Linker(*this); }
235