1 //===--- OpenBSD.cpp - OpenBSD 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 "OpenBSD.h"
10 #include "Arch/Mips.h"
11 #include "Arch/Sparc.h"
12 #include "CommonArgs.h"
13 #include "clang/Driver/Compilation.h"
14 #include "clang/Driver/Options.h"
15 #include "clang/Driver/SanitizerArgs.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
ConstructJob(Compilation & C,const JobAction & JA,const InputInfo & Output,const InputInfoList & Inputs,const ArgList & Args,const char * LinkingOutput) const24 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().getTriple().isLittleEndian())
71 CmdArgs.push_back("-EL");
72 else
73 CmdArgs.push_back("-EB");
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
ConstructJob(Compilation & C,const JobAction & JA,const InputInfo & Output,const InputInfoList & Inputs,const ArgList & Args,const char * LinkingOutput) const95 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 toolchains::OpenBSD &ToolChain =
101 static_cast<const toolchains::OpenBSD &>(getToolChain());
102 const Driver &D = getToolChain().getDriver();
103 ArgStringList CmdArgs;
104
105 // Silence warning for "clang -g foo.o -o foo"
106 Args.ClaimAllArgs(options::OPT_g_Group);
107 // and "clang -emit-llvm foo.o -o foo"
108 Args.ClaimAllArgs(options::OPT_emit_llvm);
109 // and for "clang -w foo.o -o foo". Other warning options are already
110 // handled somewhere else.
111 Args.ClaimAllArgs(options::OPT_w);
112
113 if (ToolChain.getArch() == llvm::Triple::mips64)
114 CmdArgs.push_back("-EB");
115 else if (ToolChain.getArch() == llvm::Triple::mips64el)
116 CmdArgs.push_back("-EL");
117
118 if (!Args.hasArg(options::OPT_nostdlib, options::OPT_shared)) {
119 CmdArgs.push_back("-e");
120 CmdArgs.push_back("__start");
121 }
122
123 CmdArgs.push_back("--eh-frame-hdr");
124 if (Args.hasArg(options::OPT_static)) {
125 CmdArgs.push_back("-Bstatic");
126 } else {
127 if (Args.hasArg(options::OPT_rdynamic))
128 CmdArgs.push_back("-export-dynamic");
129 CmdArgs.push_back("-Bdynamic");
130 if (Args.hasArg(options::OPT_shared)) {
131 CmdArgs.push_back("-shared");
132 } else {
133 CmdArgs.push_back("-dynamic-linker");
134 CmdArgs.push_back("/usr/libexec/ld.so");
135 }
136 }
137
138 if (Args.hasArg(options::OPT_pie))
139 CmdArgs.push_back("-pie");
140 if (Args.hasArg(options::OPT_nopie) || Args.hasArg(options::OPT_pg))
141 CmdArgs.push_back("-nopie");
142
143 if (Output.isFilename()) {
144 CmdArgs.push_back("-o");
145 CmdArgs.push_back(Output.getFilename());
146 } else {
147 assert(Output.isNothing() && "Invalid output.");
148 }
149
150 if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
151 const char *crt0 = nullptr;
152 const char *crtbegin = nullptr;
153 if (!Args.hasArg(options::OPT_shared)) {
154 if (Args.hasArg(options::OPT_pg))
155 crt0 = "gcrt0.o";
156 else if (Args.hasArg(options::OPT_static) &&
157 !Args.hasArg(options::OPT_nopie))
158 crt0 = "rcrt0.o";
159 else
160 crt0 = "crt0.o";
161 crtbegin = "crtbegin.o";
162 } else {
163 crtbegin = "crtbeginS.o";
164 }
165
166 if (crt0)
167 CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crt0)));
168 CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtbegin)));
169 }
170
171 Args.AddAllArgs(CmdArgs, options::OPT_L);
172 ToolChain.AddFilePathLibArgs(Args, CmdArgs);
173 Args.AddAllArgs(CmdArgs, {options::OPT_T_Group, options::OPT_e,
174 options::OPT_s, options::OPT_t,
175 options::OPT_Z_Flag, options::OPT_r});
176
177 bool NeedsSanitizerDeps = addSanitizerRuntimes(ToolChain, Args, CmdArgs);
178 bool NeedsXRayDeps = addXRayRuntime(ToolChain, Args, CmdArgs);
179 AddLinkerInputs(ToolChain, Inputs, Args, CmdArgs, JA);
180
181 if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nodefaultlibs)) {
182 if (D.CCCIsCXX()) {
183 if (ToolChain.ShouldLinkCXXStdlib(Args))
184 ToolChain.AddCXXStdlibLibArgs(Args, CmdArgs);
185 if (Args.hasArg(options::OPT_pg))
186 CmdArgs.push_back("-lm_p");
187 else
188 CmdArgs.push_back("-lm");
189 }
190 if (NeedsSanitizerDeps) {
191 CmdArgs.push_back(ToolChain.getCompilerRTArgString(Args, "builtins"));
192 linkSanitizerRuntimeDeps(ToolChain, CmdArgs);
193 }
194 if (NeedsXRayDeps) {
195 CmdArgs.push_back(ToolChain.getCompilerRTArgString(Args, "builtins"));
196 linkXRayRuntimeDeps(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("-lcompiler_rt");
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("-lcompiler_rt");
217 }
218
219 if (!Args.hasArg(options::OPT_nostdlib, options::OPT_nostartfiles)) {
220 const char *crtend = nullptr;
221 if (!Args.hasArg(options::OPT_shared))
222 crtend = "crtend.o";
223 else
224 crtend = "crtendS.o";
225
226 CmdArgs.push_back(Args.MakeArgString(ToolChain.GetFilePath(crtend)));
227 }
228
229 const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
230 C.addCommand(llvm::make_unique<Command>(JA, *this, Exec, CmdArgs, Inputs));
231 }
232
getSupportedSanitizers() const233 SanitizerMask OpenBSD::getSupportedSanitizers() const {
234 const bool IsX86 = getTriple().getArch() == llvm::Triple::x86;
235 const bool IsX86_64 = getTriple().getArch() == llvm::Triple::x86_64;
236
237 // For future use, only UBsan at the moment
238 SanitizerMask Res = ToolChain::getSupportedSanitizers();
239
240 if (IsX86 || IsX86_64) {
241 Res |= SanitizerKind::Vptr;
242 Res |= SanitizerKind::Fuzzer;
243 Res |= SanitizerKind::FuzzerNoLink;
244 }
245
246 return Res;
247 }
248
249 /// OpenBSD - OpenBSD tool chain which can call as(1) and ld(1) directly.
250
OpenBSD(const Driver & D,const llvm::Triple & Triple,const ArgList & Args)251 OpenBSD::OpenBSD(const Driver &D, const llvm::Triple &Triple,
252 const ArgList &Args)
253 : Generic_ELF(D, Triple, Args) {
254 getFilePaths().push_back(getDriver().SysRoot + "/usr/lib");
255 }
256
AddCXXStdlibLibArgs(const ArgList & Args,ArgStringList & CmdArgs) const257 void OpenBSD::AddCXXStdlibLibArgs(const ArgList &Args,
258 ArgStringList &CmdArgs) const {
259 bool Profiling = Args.hasArg(options::OPT_pg);
260
261 CmdArgs.push_back(Profiling ? "-lc++_p" : "-lc++");
262 CmdArgs.push_back(Profiling ? "-lc++abi_p" : "-lc++abi");
263 }
264
buildAssembler() const265 Tool *OpenBSD::buildAssembler() const {
266 return new tools::openbsd::Assembler(*this);
267 }
268
buildLinker() const269 Tool *OpenBSD::buildLinker() const { return new tools::openbsd::Linker(*this); }
270