X86MCTargetDesc.cpp revision 263508 
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#define GET_REGINFO_MC_DESC
31#include "X86GenRegisterInfo.inc"
32
33#define GET_INSTRINFO_MC_DESC
34#include "X86GenInstrInfo.inc"
35
36#define GET_SUBTARGETINFO_MC_DESC
37#include "X86GenSubtargetInfo.inc"
38
39#if _MSC_VER
40#include <intrin.h>
41#endif
42
43using namespace llvm;
44
45
46std::string X86_MC::ParseX86Triple(StringRef TT) {
47  Triple TheTriple(TT);
48  std::string FS;
49  if (TheTriple.getArch() == Triple::x86_64)
50    FS = "+64bit-mode";
51  else
52    FS = "-64bit-mode";
53  return FS;
54}
55
56/// GetCpuIDAndInfo - Execute the specified cpuid and return the 4 values in the
57/// specified arguments.  If we can't run cpuid on the host, return true.
58bool X86_MC::GetCpuIDAndInfo(unsigned value, unsigned *rEAX,
59                             unsigned *rEBX, unsigned *rECX, unsigned *rEDX) {
60#if defined(__x86_64__) || defined(_M_AMD64) || defined (_M_X64)
61  #if defined(__GNUC__)
62    // gcc doesn't know cpuid would clobber ebx/rbx. Preseve it manually.
63    asm ("movq\t%%rbx, %%rsi\n\t"
64         "cpuid\n\t"
65         "xchgq\t%%rbx, %%rsi\n\t"
66         : "=a" (*rEAX),
67           "=S" (*rEBX),
68           "=c" (*rECX),
69           "=d" (*rEDX)
70         :  "a" (value));
71    return false;
72  #elif defined(_MSC_VER)
73    int registers[4];
74    __cpuid(registers, value);
75    *rEAX = registers[0];
76    *rEBX = registers[1];
77    *rECX = registers[2];
78    *rEDX = registers[3];
79    return false;
80  #else
81    return true;
82  #endif
83#elif defined(i386) || defined(__i386__) || defined(__x86__) || defined(_M_IX86)
84  #if defined(__GNUC__)
85    asm ("movl\t%%ebx, %%esi\n\t"
86         "cpuid\n\t"
87         "xchgl\t%%ebx, %%esi\n\t"
88         : "=a" (*rEAX),
89           "=S" (*rEBX),
90           "=c" (*rECX),
91           "=d" (*rEDX)
92         :  "a" (value));
93    return false;
94  #elif defined(_MSC_VER)
95    __asm {
96      mov   eax,value
97      cpuid
98      mov   esi,rEAX
99      mov   dword ptr [esi],eax
100      mov   esi,rEBX
101      mov   dword ptr [esi],ebx
102      mov   esi,rECX
103      mov   dword ptr [esi],ecx
104      mov   esi,rEDX
105      mov   dword ptr [esi],edx
106    }
107    return false;
108  #else
109    return true;
110  #endif
111#else
112  return true;
113#endif
114}
115
116/// GetCpuIDAndInfoEx - Execute the specified cpuid with subleaf and return the
117/// 4 values in the specified arguments.  If we can't run cpuid on the host,
118/// return true.
119bool X86_MC::GetCpuIDAndInfoEx(unsigned value, unsigned subleaf, unsigned *rEAX,
120                               unsigned *rEBX, unsigned *rECX, unsigned *rEDX) {
121#if defined(__x86_64__) || defined(_M_AMD64) || defined (_M_X64)
122  #if defined(__GNUC__)
123    // gcc desn't know cpuid would clobber ebx/rbx. Preseve it manually.
124    asm ("movq\t%%rbx, %%rsi\n\t"
125         "cpuid\n\t"
126         "xchgq\t%%rbx, %%rsi\n\t"
127         : "=a" (*rEAX),
128           "=S" (*rEBX),
129           "=c" (*rECX),
130           "=d" (*rEDX)
131         :  "a" (value),
132            "c" (subleaf));
133    return false;
134  #elif defined(_MSC_VER)
135    // __cpuidex was added in MSVC++ 9.0 SP1
136    #if (_MSC_VER > 1500) || (_MSC_VER == 1500 && _MSC_FULL_VER >= 150030729)
137      int registers[4];
138      __cpuidex(registers, value, subleaf);
139      *rEAX = registers[0];
140      *rEBX = registers[1];
141      *rECX = registers[2];
142      *rEDX = registers[3];
143      return false;
144    #else
145      return true;
146    #endif
147  #else
148    return true;
149  #endif
150#elif defined(i386) || defined(__i386__) || defined(__x86__) || defined(_M_IX86)
151  #if defined(__GNUC__)
152    asm ("movl\t%%ebx, %%esi\n\t"
153         "cpuid\n\t"
154         "xchgl\t%%ebx, %%esi\n\t"
155         : "=a" (*rEAX),
156           "=S" (*rEBX),
157           "=c" (*rECX),
158           "=d" (*rEDX)
159         :  "a" (value),
160            "c" (subleaf));
161    return false;
162  #elif defined(_MSC_VER)
163    __asm {
164      mov   eax,value
165      mov   ecx,subleaf
166      cpuid
167      mov   esi,rEAX
168      mov   dword ptr [esi],eax
169      mov   esi,rEBX
170      mov   dword ptr [esi],ebx
171      mov   esi,rECX
172      mov   dword ptr [esi],ecx
173      mov   esi,rEDX
174      mov   dword ptr [esi],edx
175    }
176    return false;
177  #else
178    return true;
179  #endif
180#else
181  return true;
182#endif
183}
184
185void X86_MC::DetectFamilyModel(unsigned EAX, unsigned &Family,
186                               unsigned &Model) {
187  Family = (EAX >> 8) & 0xf; // Bits 8 - 11
188  Model  = (EAX >> 4) & 0xf; // Bits 4 - 7
189  if (Family == 6 || Family == 0xf) {
190    if (Family == 0xf)
191      // Examine extended family ID if family ID is F.
192      Family += (EAX >> 20) & 0xff;    // Bits 20 - 27
193    // Examine extended model ID if family ID is 6 or F.
194    Model += ((EAX >> 16) & 0xf) << 4; // Bits 16 - 19
195  }
196}
197
198unsigned X86_MC::getDwarfRegFlavour(StringRef TT, bool isEH) {
199  Triple TheTriple(TT);
200  if (TheTriple.getArch() == Triple::x86_64)
201    return DWARFFlavour::X86_64;
202
203  if (TheTriple.isOSDarwin())
204    return isEH ? DWARFFlavour::X86_32_DarwinEH : DWARFFlavour::X86_32_Generic;
205  if (TheTriple.getOS() == Triple::MinGW32 ||
206      TheTriple.getOS() == Triple::Cygwin)
207    // Unsupported by now, just quick fallback
208    return DWARFFlavour::X86_32_Generic;
209  return DWARFFlavour::X86_32_Generic;
210}
211
212void X86_MC::InitLLVM2SEHRegisterMapping(MCRegisterInfo *MRI) {
213  // FIXME: TableGen these.
214  for (unsigned Reg = X86::NoRegister+1; Reg < X86::NUM_TARGET_REGS; ++Reg) {
215    unsigned SEH = MRI->getEncodingValue(Reg);
216    MRI->mapLLVMRegToSEHReg(Reg, SEH);
217  }
218}
219
220MCSubtargetInfo *X86_MC::createX86MCSubtargetInfo(StringRef TT, StringRef CPU,
221                                                  StringRef FS) {
222  std::string ArchFS = X86_MC::ParseX86Triple(TT);
223  if (!FS.empty()) {
224    if (!ArchFS.empty())
225      ArchFS = ArchFS + "," + FS.str();
226    else
227      ArchFS = FS;
228  }
229
230  std::string CPUName = CPU;
231  if (CPUName.empty()) {
232#if defined(i386) || defined(__i386__) || defined(__x86__) || defined(_M_IX86)\
233    || defined(__x86_64__) || defined(_M_AMD64) || defined (_M_X64)
234    CPUName = sys::getHostCPUName();
235#else
236    CPUName = "generic";
237#endif
238  }
239
240  MCSubtargetInfo *X = new MCSubtargetInfo();
241  InitX86MCSubtargetInfo(X, TT, CPUName, ArchFS);
242  return X;
243}
244
245static MCInstrInfo *createX86MCInstrInfo() {
246  MCInstrInfo *X = new MCInstrInfo();
247  InitX86MCInstrInfo(X);
248  return X;
249}
250
251static MCRegisterInfo *createX86MCRegisterInfo(StringRef TT) {
252  Triple TheTriple(TT);
253  unsigned RA = (TheTriple.getArch() == Triple::x86_64)
254    ? X86::RIP     // Should have dwarf #16.
255    : X86::EIP;    // Should have dwarf #8.
256
257  MCRegisterInfo *X = new MCRegisterInfo();
258  InitX86MCRegisterInfo(X, RA,
259                        X86_MC::getDwarfRegFlavour(TT, false),
260                        X86_MC::getDwarfRegFlavour(TT, true),
261                        RA);
262  X86_MC::InitLLVM2SEHRegisterMapping(X);
263  return X;
264}
265
266static MCAsmInfo *createX86MCAsmInfo(const MCRegisterInfo &MRI, StringRef TT) {
267  Triple TheTriple(TT);
268  bool is64Bit = TheTriple.getArch() == Triple::x86_64;
269
270  MCAsmInfo *MAI;
271  if (TheTriple.isOSDarwin() || TheTriple.getEnvironment() == Triple::MachO) {
272    if (is64Bit)
273      MAI = new X86_64MCAsmInfoDarwin(TheTriple);
274    else
275      MAI = new X86MCAsmInfoDarwin(TheTriple);
276  } else if (TheTriple.getEnvironment() == Triple::ELF) {
277    // Force the use of an ELF container.
278    MAI = new X86ELFMCAsmInfo(TheTriple);
279  } else if (TheTriple.getOS() == Triple::Win32) {
280    MAI = new X86MCAsmInfoMicrosoft(TheTriple);
281  } else if (TheTriple.getOS() == Triple::MinGW32 || TheTriple.getOS() == Triple::Cygwin) {
282    MAI = new X86MCAsmInfoGNUCOFF(TheTriple);
283  } else {
284    // The default is ELF.
285    MAI = new X86ELFMCAsmInfo(TheTriple);
286  }
287
288  // Initialize initial frame state.
289  // Calculate amount of bytes used for return address storing
290  int stackGrowth = is64Bit ? -8 : -4;
291
292  // Initial state of the frame pointer is esp+stackGrowth.
293  unsigned StackPtr = is64Bit ? X86::RSP : X86::ESP;
294  MCCFIInstruction Inst = MCCFIInstruction::createDefCfa(
295      0, MRI.getDwarfRegNum(StackPtr, true), -stackGrowth);
296  MAI->addInitialFrameState(Inst);
297
298  // Add return address to move list
299  unsigned InstPtr = is64Bit ? X86::RIP : X86::EIP;
300  MCCFIInstruction Inst2 = MCCFIInstruction::createOffset(
301      0, MRI.getDwarfRegNum(InstPtr, true), stackGrowth);
302  MAI->addInitialFrameState(Inst2);
303
304  return MAI;
305}
306
307static MCCodeGenInfo *createX86MCCodeGenInfo(StringRef TT, Reloc::Model RM,
308                                             CodeModel::Model CM,
309                                             CodeGenOpt::Level OL) {
310  MCCodeGenInfo *X = new MCCodeGenInfo();
311
312  Triple T(TT);
313  bool is64Bit = T.getArch() == Triple::x86_64;
314
315  if (RM == Reloc::Default) {
316    // Darwin defaults to PIC in 64 bit mode and dynamic-no-pic in 32 bit mode.
317    // Win64 requires rip-rel addressing, thus we force it to PIC. Otherwise we
318    // use static relocation model by default.
319    if (T.isOSDarwin()) {
320      if (is64Bit)
321        RM = Reloc::PIC_;
322      else
323        RM = Reloc::DynamicNoPIC;
324    } else if (T.isOSWindows() && is64Bit)
325      RM = Reloc::PIC_;
326    else
327      RM = Reloc::Static;
328  }
329
330  // ELF and X86-64 don't have a distinct DynamicNoPIC model.  DynamicNoPIC
331  // is defined as a model for code which may be used in static or dynamic
332  // executables but not necessarily a shared library. On X86-32 we just
333  // compile in -static mode, in x86-64 we use PIC.
334  if (RM == Reloc::DynamicNoPIC) {
335    if (is64Bit)
336      RM = Reloc::PIC_;
337    else if (!T.isOSDarwin())
338      RM = Reloc::Static;
339  }
340
341  // If we are on Darwin, disallow static relocation model in X86-64 mode, since
342  // the Mach-O file format doesn't support it.
343  if (RM == Reloc::Static && T.isOSDarwin() && is64Bit)
344    RM = Reloc::PIC_;
345
346  // For static codegen, if we're not already set, use Small codegen.
347  if (CM == CodeModel::Default)
348    CM = CodeModel::Small;
349  else if (CM == CodeModel::JITDefault)
350    // 64-bit JIT places everything in the same buffer except external funcs.
351    CM = is64Bit ? CodeModel::Large : CodeModel::Small;
352
353  X->InitMCCodeGenInfo(RM, CM, OL);
354  return X;
355}
356
357static MCStreamer *createMCStreamer(const Target &T, StringRef TT,
358                                    MCContext &Ctx, MCAsmBackend &MAB,
359                                    raw_ostream &_OS,
360                                    MCCodeEmitter *_Emitter,
361                                    bool RelaxAll,
362                                    bool NoExecStack) {
363  Triple TheTriple(TT);
364
365  if (TheTriple.isOSDarwin() || TheTriple.getEnvironment() == Triple::MachO)
366    return createMachOStreamer(Ctx, MAB, _OS, _Emitter, RelaxAll);
367
368  if (TheTriple.isOSWindows() && TheTriple.getEnvironment() != Triple::ELF)
369    return createWinCOFFStreamer(Ctx, MAB, *_Emitter, _OS, RelaxAll);
370
371  return createELFStreamer(Ctx, 0, MAB, _OS, _Emitter, RelaxAll, NoExecStack);
372}
373
374static MCInstPrinter *createX86MCInstPrinter(const Target &T,
375                                             unsigned SyntaxVariant,
376                                             const MCAsmInfo &MAI,
377                                             const MCInstrInfo &MII,
378                                             const MCRegisterInfo &MRI,
379                                             const MCSubtargetInfo &STI) {
380  if (SyntaxVariant == 0)
381    return new X86ATTInstPrinter(MAI, MII, MRI);
382  if (SyntaxVariant == 1)
383    return new X86IntelInstPrinter(MAI, MII, MRI);
384  return 0;
385}
386
387static MCRelocationInfo *createX86MCRelocationInfo(StringRef TT,
388                                                   MCContext &Ctx) {
389  Triple TheTriple(TT);
390  if (TheTriple.isEnvironmentMachO() && TheTriple.getArch() == Triple::x86_64)
391    return createX86_64MachORelocationInfo(Ctx);
392  else if (TheTriple.isOSBinFormatELF())
393    return createX86_64ELFRelocationInfo(Ctx);
394  // Default to the stock relocation info.
395  return llvm::createMCRelocationInfo(TT, Ctx);
396}
397
398static MCInstrAnalysis *createX86MCInstrAnalysis(const MCInstrInfo *Info) {
399  return new MCInstrAnalysis(Info);
400}
401
402// Force static initialization.
403extern "C" void LLVMInitializeX86TargetMC() {
404  // Register the MC asm info.
405  RegisterMCAsmInfoFn A(TheX86_32Target, createX86MCAsmInfo);
406  RegisterMCAsmInfoFn B(TheX86_64Target, createX86MCAsmInfo);
407
408  // Register the MC codegen info.
409  RegisterMCCodeGenInfoFn C(TheX86_32Target, createX86MCCodeGenInfo);
410  RegisterMCCodeGenInfoFn D(TheX86_64Target, createX86MCCodeGenInfo);
411
412  // Register the MC instruction info.
413  TargetRegistry::RegisterMCInstrInfo(TheX86_32Target, createX86MCInstrInfo);
414  TargetRegistry::RegisterMCInstrInfo(TheX86_64Target, createX86MCInstrInfo);
415
416  // Register the MC register info.
417  TargetRegistry::RegisterMCRegInfo(TheX86_32Target, createX86MCRegisterInfo);
418  TargetRegistry::RegisterMCRegInfo(TheX86_64Target, createX86MCRegisterInfo);
419
420  // Register the MC subtarget info.
421  TargetRegistry::RegisterMCSubtargetInfo(TheX86_32Target,
422                                          X86_MC::createX86MCSubtargetInfo);
423  TargetRegistry::RegisterMCSubtargetInfo(TheX86_64Target,
424                                          X86_MC::createX86MCSubtargetInfo);
425
426  // Register the MC instruction analyzer.
427  TargetRegistry::RegisterMCInstrAnalysis(TheX86_32Target,
428                                          createX86MCInstrAnalysis);
429  TargetRegistry::RegisterMCInstrAnalysis(TheX86_64Target,
430                                          createX86MCInstrAnalysis);
431
432  // Register the code emitter.
433  TargetRegistry::RegisterMCCodeEmitter(TheX86_32Target,
434                                        createX86MCCodeEmitter);
435  TargetRegistry::RegisterMCCodeEmitter(TheX86_64Target,
436                                        createX86MCCodeEmitter);
437
438  // Register the asm backend.
439  TargetRegistry::RegisterMCAsmBackend(TheX86_32Target,
440                                       createX86_32AsmBackend);
441  TargetRegistry::RegisterMCAsmBackend(TheX86_64Target,
442                                       createX86_64AsmBackend);
443
444  // Register the object streamer.
445  TargetRegistry::RegisterMCObjectStreamer(TheX86_32Target,
446                                           createMCStreamer);
447  TargetRegistry::RegisterMCObjectStreamer(TheX86_64Target,
448                                           createMCStreamer);
449
450  // Register the MCInstPrinter.
451  TargetRegistry::RegisterMCInstPrinter(TheX86_32Target,
452                                        createX86MCInstPrinter);
453  TargetRegistry::RegisterMCInstPrinter(TheX86_64Target,
454                                        createX86MCInstPrinter);
455
456  // Register the MC relocation info.
457  TargetRegistry::RegisterMCRelocationInfo(TheX86_32Target,
458                                           createX86MCRelocationInfo);
459  TargetRegistry::RegisterMCRelocationInfo(TheX86_64Target,
460                                           createX86MCRelocationInfo);
461}
462