1 //===-- X86MCTargetDesc.cpp - X86 Target Descriptions ---------------------===//
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 // This file provides X86 specific target descriptions.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "X86MCTargetDesc.h"
15 #include "InstPrinter/X86ATTInstPrinter.h"
16 #include "InstPrinter/X86IntelInstPrinter.h"
17 #include "X86MCAsmInfo.h"
18 #include "llvm/ADT/Triple.h"
19 #include "llvm/MC/MCCodeGenInfo.h"
20 #include "llvm/MC/MCInstrAnalysis.h"
21 #include "llvm/MC/MCInstrInfo.h"
22 #include "llvm/MC/MCRegisterInfo.h"
23 #include "llvm/MC/MCStreamer.h"
24 #include "llvm/MC/MCSubtargetInfo.h"
25 #include "llvm/MC/MachineLocation.h"
26 #include "llvm/Support/ErrorHandling.h"
27 #include "llvm/Support/Host.h"
28 #include "llvm/Support/TargetRegistry.h"
29
30 #if _MSC_VER
31 #include <intrin.h>
32 #endif
33
34 using namespace llvm;
35
36 #define GET_REGINFO_MC_DESC
37 #include "X86GenRegisterInfo.inc"
38
39 #define GET_INSTRINFO_MC_DESC
40 #include "X86GenInstrInfo.inc"
41
42 #define GET_SUBTARGETINFO_MC_DESC
43 #include "X86GenSubtargetInfo.inc"
44
ParseX86Triple(StringRef TT)45 std::string X86_MC::ParseX86Triple(StringRef TT) {
46 Triple TheTriple(TT);
47 std::string FS;
48 if (TheTriple.getArch() == Triple::x86_64)
49 FS = "+64bit-mode,-32bit-mode,-16bit-mode";
50 else if (TheTriple.getEnvironment() != Triple::CODE16)
51 FS = "-64bit-mode,+32bit-mode,-16bit-mode";
52 else
53 FS = "-64bit-mode,-32bit-mode,+16bit-mode";
54
55 return FS;
56 }
57
getDwarfRegFlavour(Triple TT,bool isEH)58 unsigned X86_MC::getDwarfRegFlavour(Triple TT, bool isEH) {
59 if (TT.getArch() == Triple::x86_64)
60 return DWARFFlavour::X86_64;
61
62 if (TT.isOSDarwin())
63 return isEH ? DWARFFlavour::X86_32_DarwinEH : DWARFFlavour::X86_32_Generic;
64 if (TT.isOSCygMing())
65 // Unsupported by now, just quick fallback
66 return DWARFFlavour::X86_32_Generic;
67 return DWARFFlavour::X86_32_Generic;
68 }
69
InitLLVM2SEHRegisterMapping(MCRegisterInfo * MRI)70 void X86_MC::InitLLVM2SEHRegisterMapping(MCRegisterInfo *MRI) {
71 // FIXME: TableGen these.
72 for (unsigned Reg = X86::NoRegister+1; Reg < X86::NUM_TARGET_REGS; ++Reg) {
73 unsigned SEH = MRI->getEncodingValue(Reg);
74 MRI->mapLLVMRegToSEHReg(Reg, SEH);
75 }
76 }
77
createX86MCSubtargetInfo(StringRef TT,StringRef CPU,StringRef FS)78 MCSubtargetInfo *X86_MC::createX86MCSubtargetInfo(StringRef TT, StringRef CPU,
79 StringRef FS) {
80 std::string ArchFS = X86_MC::ParseX86Triple(TT);
81 if (!FS.empty()) {
82 if (!ArchFS.empty())
83 ArchFS = (Twine(ArchFS) + "," + FS).str();
84 else
85 ArchFS = FS;
86 }
87
88 std::string CPUName = CPU;
89 if (CPUName.empty())
90 CPUName = "generic";
91
92 MCSubtargetInfo *X = new MCSubtargetInfo();
93 InitX86MCSubtargetInfo(X, TT, CPUName, ArchFS);
94 return X;
95 }
96
createX86MCInstrInfo()97 static MCInstrInfo *createX86MCInstrInfo() {
98 MCInstrInfo *X = new MCInstrInfo();
99 InitX86MCInstrInfo(X);
100 return X;
101 }
102
createX86MCRegisterInfo(StringRef TT)103 static MCRegisterInfo *createX86MCRegisterInfo(StringRef TT) {
104 Triple TheTriple(TT);
105 unsigned RA = (TheTriple.getArch() == Triple::x86_64)
106 ? X86::RIP // Should have dwarf #16.
107 : X86::EIP; // Should have dwarf #8.
108
109 MCRegisterInfo *X = new MCRegisterInfo();
110 InitX86MCRegisterInfo(X, RA,
111 X86_MC::getDwarfRegFlavour(TheTriple, false),
112 X86_MC::getDwarfRegFlavour(TheTriple, true),
113 RA);
114 X86_MC::InitLLVM2SEHRegisterMapping(X);
115 return X;
116 }
117
createX86MCAsmInfo(const MCRegisterInfo & MRI,StringRef TT)118 static MCAsmInfo *createX86MCAsmInfo(const MCRegisterInfo &MRI, StringRef TT) {
119 Triple TheTriple(TT);
120 bool is64Bit = TheTriple.getArch() == Triple::x86_64;
121
122 MCAsmInfo *MAI;
123 if (TheTriple.isOSBinFormatMachO()) {
124 if (is64Bit)
125 MAI = new X86_64MCAsmInfoDarwin(TheTriple);
126 else
127 MAI = new X86MCAsmInfoDarwin(TheTriple);
128 } else if (TheTriple.isOSBinFormatELF()) {
129 // Force the use of an ELF container.
130 MAI = new X86ELFMCAsmInfo(TheTriple);
131 } else if (TheTriple.isWindowsMSVCEnvironment()) {
132 MAI = new X86MCAsmInfoMicrosoft(TheTriple);
133 } else if (TheTriple.isOSCygMing() ||
134 TheTriple.isWindowsItaniumEnvironment()) {
135 MAI = new X86MCAsmInfoGNUCOFF(TheTriple);
136 } else {
137 // The default is ELF.
138 MAI = new X86ELFMCAsmInfo(TheTriple);
139 }
140
141 // Initialize initial frame state.
142 // Calculate amount of bytes used for return address storing
143 int stackGrowth = is64Bit ? -8 : -4;
144
145 // Initial state of the frame pointer is esp+stackGrowth.
146 unsigned StackPtr = is64Bit ? X86::RSP : X86::ESP;
147 MCCFIInstruction Inst = MCCFIInstruction::createDefCfa(
148 nullptr, MRI.getDwarfRegNum(StackPtr, true), -stackGrowth);
149 MAI->addInitialFrameState(Inst);
150
151 // Add return address to move list
152 unsigned InstPtr = is64Bit ? X86::RIP : X86::EIP;
153 MCCFIInstruction Inst2 = MCCFIInstruction::createOffset(
154 nullptr, MRI.getDwarfRegNum(InstPtr, true), stackGrowth);
155 MAI->addInitialFrameState(Inst2);
156
157 return MAI;
158 }
159
createX86MCCodeGenInfo(StringRef TT,Reloc::Model RM,CodeModel::Model CM,CodeGenOpt::Level OL)160 static MCCodeGenInfo *createX86MCCodeGenInfo(StringRef TT, Reloc::Model RM,
161 CodeModel::Model CM,
162 CodeGenOpt::Level OL) {
163 MCCodeGenInfo *X = new MCCodeGenInfo();
164
165 Triple T(TT);
166 bool is64Bit = T.getArch() == Triple::x86_64;
167
168 if (RM == Reloc::Default) {
169 // Darwin defaults to PIC in 64 bit mode and dynamic-no-pic in 32 bit mode.
170 // Win64 requires rip-rel addressing, thus we force it to PIC. Otherwise we
171 // use static relocation model by default.
172 if (T.isOSDarwin()) {
173 if (is64Bit)
174 RM = Reloc::PIC_;
175 else
176 RM = Reloc::DynamicNoPIC;
177 } else if (T.isOSWindows() && is64Bit)
178 RM = Reloc::PIC_;
179 else
180 RM = Reloc::Static;
181 }
182
183 // ELF and X86-64 don't have a distinct DynamicNoPIC model. DynamicNoPIC
184 // is defined as a model for code which may be used in static or dynamic
185 // executables but not necessarily a shared library. On X86-32 we just
186 // compile in -static mode, in x86-64 we use PIC.
187 if (RM == Reloc::DynamicNoPIC) {
188 if (is64Bit)
189 RM = Reloc::PIC_;
190 else if (!T.isOSDarwin())
191 RM = Reloc::Static;
192 }
193
194 // If we are on Darwin, disallow static relocation model in X86-64 mode, since
195 // the Mach-O file format doesn't support it.
196 if (RM == Reloc::Static && T.isOSDarwin() && is64Bit)
197 RM = Reloc::PIC_;
198
199 // For static codegen, if we're not already set, use Small codegen.
200 if (CM == CodeModel::Default)
201 CM = CodeModel::Small;
202 else if (CM == CodeModel::JITDefault)
203 // 64-bit JIT places everything in the same buffer except external funcs.
204 CM = is64Bit ? CodeModel::Large : CodeModel::Small;
205
206 X->InitMCCodeGenInfo(RM, CM, OL);
207 return X;
208 }
209
createX86MCInstPrinter(const Triple & T,unsigned SyntaxVariant,const MCAsmInfo & MAI,const MCInstrInfo & MII,const MCRegisterInfo & MRI)210 static MCInstPrinter *createX86MCInstPrinter(const Triple &T,
211 unsigned SyntaxVariant,
212 const MCAsmInfo &MAI,
213 const MCInstrInfo &MII,
214 const MCRegisterInfo &MRI) {
215 if (SyntaxVariant == 0)
216 return new X86ATTInstPrinter(MAI, MII, MRI);
217 if (SyntaxVariant == 1)
218 return new X86IntelInstPrinter(MAI, MII, MRI);
219 return nullptr;
220 }
221
createX86MCRelocationInfo(StringRef TT,MCContext & Ctx)222 static MCRelocationInfo *createX86MCRelocationInfo(StringRef TT,
223 MCContext &Ctx) {
224 Triple TheTriple(TT);
225 if (TheTriple.isOSBinFormatMachO() && TheTriple.getArch() == Triple::x86_64)
226 return createX86_64MachORelocationInfo(Ctx);
227 else if (TheTriple.isOSBinFormatELF())
228 return createX86_64ELFRelocationInfo(Ctx);
229 // Default to the stock relocation info.
230 return llvm::createMCRelocationInfo(TT, Ctx);
231 }
232
createX86MCInstrAnalysis(const MCInstrInfo * Info)233 static MCInstrAnalysis *createX86MCInstrAnalysis(const MCInstrInfo *Info) {
234 return new MCInstrAnalysis(Info);
235 }
236
237 // Force static initialization.
LLVMInitializeX86TargetMC()238 extern "C" void LLVMInitializeX86TargetMC() {
239 for (Target *T : {&TheX86_32Target, &TheX86_64Target}) {
240 // Register the MC asm info.
241 RegisterMCAsmInfoFn X(*T, createX86MCAsmInfo);
242
243 // Register the MC codegen info.
244 RegisterMCCodeGenInfoFn Y(*T, createX86MCCodeGenInfo);
245
246 // Register the MC instruction info.
247 TargetRegistry::RegisterMCInstrInfo(*T, createX86MCInstrInfo);
248
249 // Register the MC register info.
250 TargetRegistry::RegisterMCRegInfo(*T, createX86MCRegisterInfo);
251
252 // Register the MC subtarget info.
253 TargetRegistry::RegisterMCSubtargetInfo(*T,
254 X86_MC::createX86MCSubtargetInfo);
255
256 // Register the MC instruction analyzer.
257 TargetRegistry::RegisterMCInstrAnalysis(*T, createX86MCInstrAnalysis);
258
259 // Register the code emitter.
260 TargetRegistry::RegisterMCCodeEmitter(*T, createX86MCCodeEmitter);
261
262 // Register the object streamer.
263 TargetRegistry::RegisterCOFFStreamer(*T, createX86WinCOFFStreamer);
264
265 // Register the MCInstPrinter.
266 TargetRegistry::RegisterMCInstPrinter(*T, createX86MCInstPrinter);
267
268 // Register the MC relocation info.
269 TargetRegistry::RegisterMCRelocationInfo(*T, createX86MCRelocationInfo);
270 }
271
272 // Register the asm backend.
273 TargetRegistry::RegisterMCAsmBackend(TheX86_32Target,
274 createX86_32AsmBackend);
275 TargetRegistry::RegisterMCAsmBackend(TheX86_64Target,
276 createX86_64AsmBackend);
277 }
278