1 //===-- MipsTargetStreamer.cpp - Mips Target Streamer Methods -------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file provides Mips specific target streamer methods.
12 //===----------------------------------------------------------------------===//
14 #include "InstPrinter/MipsInstPrinter.h"
15 #include "MipsMCTargetDesc.h"
16 #include "MipsTargetObjectFile.h"
17 #include "MipsTargetStreamer.h"
18 #include "llvm/MC/MCContext.h"
19 #include "llvm/MC/MCELF.h"
20 #include "llvm/MC/MCSectionELF.h"
21 #include "llvm/MC/MCSubtargetInfo.h"
22 #include "llvm/MC/MCSymbol.h"
23 #include "llvm/Support/CommandLine.h"
24 #include "llvm/Support/ELF.h"
25 #include "llvm/Support/ErrorHandling.h"
26 #include "llvm/Support/FormattedStream.h"
30 // Pin vtable to this file.
31 void MipsTargetStreamer::anchor() {}
33 MipsTargetStreamer::MipsTargetStreamer(MCStreamer &S) : MCTargetStreamer(S) {}
35 MipsTargetAsmStreamer::MipsTargetAsmStreamer(MCStreamer &S,
36 formatted_raw_ostream &OS)
37 : MipsTargetStreamer(S), OS(OS) {}
39 void MipsTargetAsmStreamer::emitDirectiveSetMicroMips() {
40 OS << "\t.set\tmicromips\n";
43 void MipsTargetAsmStreamer::emitDirectiveSetNoMicroMips() {
44 OS << "\t.set\tnomicromips\n";
47 void MipsTargetAsmStreamer::emitDirectiveSetMips16() {
48 OS << "\t.set\tmips16\n";
51 void MipsTargetAsmStreamer::emitDirectiveSetNoMips16() {
52 OS << "\t.set\tnomips16\n";
55 void MipsTargetAsmStreamer::emitDirectiveSetReorder() {
56 OS << "\t.set\treorder\n";
59 void MipsTargetAsmStreamer::emitDirectiveSetNoReorder() {
60 OS << "\t.set\tnoreorder\n";
63 void MipsTargetAsmStreamer::emitDirectiveSetMacro() {
64 OS << "\t.set\tmacro\n";
67 void MipsTargetAsmStreamer::emitDirectiveSetNoMacro() {
68 OS << "\t.set\tnomacro\n";
71 void MipsTargetAsmStreamer::emitDirectiveSetAt() {
75 void MipsTargetAsmStreamer::emitDirectiveSetNoAt() {
76 OS << "\t.set\tnoat\n";
79 void MipsTargetAsmStreamer::emitDirectiveEnd(StringRef Name) {
80 OS << "\t.end\t" << Name << '\n';
83 void MipsTargetAsmStreamer::emitDirectiveEnt(const MCSymbol &Symbol) {
84 OS << "\t.ent\t" << Symbol.getName() << '\n';
87 void MipsTargetAsmStreamer::emitDirectiveAbiCalls() { OS << "\t.abicalls\n"; }
89 void MipsTargetAsmStreamer::emitDirectiveNaN2008() { OS << "\t.nan\t2008\n"; }
91 void MipsTargetAsmStreamer::emitDirectiveNaNLegacy() {
92 OS << "\t.nan\tlegacy\n";
95 void MipsTargetAsmStreamer::emitDirectiveOptionPic0() {
96 OS << "\t.option\tpic0\n";
99 void MipsTargetAsmStreamer::emitDirectiveOptionPic2() {
100 OS << "\t.option\tpic2\n";
103 void MipsTargetAsmStreamer::emitFrame(unsigned StackReg, unsigned StackSize,
104 unsigned ReturnReg) {
106 << StringRef(MipsInstPrinter::getRegisterName(StackReg)).lower() << ","
108 << StringRef(MipsInstPrinter::getRegisterName(ReturnReg)).lower() << '\n';
111 void MipsTargetAsmStreamer::emitDirectiveSetMips32R2() {
112 OS << "\t.set\tmips32r2\n";
115 void MipsTargetAsmStreamer::emitDirectiveSetMips64() {
116 OS << "\t.set\tmips64\n";
119 void MipsTargetAsmStreamer::emitDirectiveSetMips64R2() {
120 OS << "\t.set\tmips64r2\n";
123 void MipsTargetAsmStreamer::emitDirectiveSetDsp() {
124 OS << "\t.set\tdsp\n";
126 // Print a 32 bit hex number with all numbers.
127 static void printHex32(unsigned Value, raw_ostream &OS) {
129 for (int i = 7; i >= 0; i--)
130 OS.write_hex((Value & (0xF << (i*4))) >> (i*4));
133 void MipsTargetAsmStreamer::emitMask(unsigned CPUBitmask,
134 int CPUTopSavedRegOff) {
136 printHex32(CPUBitmask, OS);
137 OS << ',' << CPUTopSavedRegOff << '\n';
140 void MipsTargetAsmStreamer::emitFMask(unsigned FPUBitmask,
141 int FPUTopSavedRegOff) {
143 printHex32(FPUBitmask, OS);
144 OS << "," << FPUTopSavedRegOff << '\n';
147 void MipsTargetAsmStreamer::emitDirectiveCpload(unsigned RegNo) {
149 << StringRef(MipsInstPrinter::getRegisterName(RegNo)).lower() << "\n";
152 // This part is for ELF object output.
153 MipsTargetELFStreamer::MipsTargetELFStreamer(MCStreamer &S,
154 const MCSubtargetInfo &STI)
155 : MipsTargetStreamer(S), MicroMipsEnabled(false), STI(STI) {
156 MCAssembler &MCA = getStreamer().getAssembler();
157 uint64_t Features = STI.getFeatureBits();
158 Triple T(STI.getTargetTriple());
159 Pic = (MCA.getContext().getObjectFileInfo()->getRelocM() == Reloc::PIC_)
163 // Update e_header flags
167 if (Features & Mips::FeatureMips64r2)
168 EFlags |= ELF::EF_MIPS_ARCH_64R2;
169 else if (Features & Mips::FeatureMips64)
170 EFlags |= ELF::EF_MIPS_ARCH_64;
171 else if (Features & Mips::FeatureMips4)
172 EFlags |= ELF::EF_MIPS_ARCH_4;
173 else if (Features & Mips::FeatureMips32r2)
174 EFlags |= ELF::EF_MIPS_ARCH_32R2;
175 else if (Features & Mips::FeatureMips32)
176 EFlags |= ELF::EF_MIPS_ARCH_32;
178 if (T.isArch64Bit()) {
179 if (Features & Mips::FeatureN32)
180 EFlags |= ELF::EF_MIPS_ABI2;
181 else if (Features & Mips::FeatureO32) {
182 EFlags |= ELF::EF_MIPS_ABI_O32;
183 EFlags |= ELF::EF_MIPS_32BITMODE; /* Compatibility Mode */
185 // No need to set any bit for N64 which is the default ABI at the moment
186 // for 64-bit Mips architectures.
188 if (Features & Mips::FeatureMips64r2 || Features & Mips::FeatureMips64)
189 EFlags |= ELF::EF_MIPS_32BITMODE;
192 EFlags |= ELF::EF_MIPS_ABI_O32;
196 if (Features & Mips::FeatureNaN2008)
197 EFlags |= ELF::EF_MIPS_NAN2008;
199 MCA.setELFHeaderEFlags(EFlags);
202 void MipsTargetELFStreamer::emitLabel(MCSymbol *Symbol) {
203 if (!isMicroMipsEnabled())
205 MCSymbolData &Data = getStreamer().getOrCreateSymbolData(Symbol);
206 uint8_t Type = MCELF::GetType(Data);
207 if (Type != ELF::STT_FUNC)
210 // The "other" values are stored in the last 6 bits of the second byte
211 // The traditional defines for STO values assume the full byte and thus
212 // the shift to pack it.
213 MCELF::setOther(Data, ELF::STO_MIPS_MICROMIPS >> 2);
216 void MipsTargetELFStreamer::finish() {
217 MCAssembler &MCA = getStreamer().getAssembler();
218 MCContext &Context = MCA.getContext();
219 MCStreamer &OS = getStreamer();
220 Triple T(STI.getTargetTriple());
221 uint64_t Features = STI.getFeatureBits();
223 if (T.isArch64Bit() && (Features & Mips::FeatureN64)) {
224 const MCSectionELF *Sec = Context.getELFSection(
225 ".MIPS.options", ELF::SHT_MIPS_OPTIONS,
226 ELF::SHF_ALLOC | ELF::SHF_MIPS_NOSTRIP, SectionKind::getMetadata());
227 OS.SwitchSection(Sec);
229 OS.EmitIntValue(1, 1); // kind
230 OS.EmitIntValue(40, 1); // size
231 OS.EmitIntValue(0, 2); // section
232 OS.EmitIntValue(0, 4); // info
233 OS.EmitIntValue(0, 4); // ri_gprmask
234 OS.EmitIntValue(0, 4); // pad
235 OS.EmitIntValue(0, 4); // ri_cpr[0]mask
236 OS.EmitIntValue(0, 4); // ri_cpr[1]mask
237 OS.EmitIntValue(0, 4); // ri_cpr[2]mask
238 OS.EmitIntValue(0, 4); // ri_cpr[3]mask
239 OS.EmitIntValue(0, 8); // ri_gp_value
241 const MCSectionELF *Sec =
242 Context.getELFSection(".reginfo", ELF::SHT_MIPS_REGINFO, ELF::SHF_ALLOC,
243 SectionKind::getMetadata());
244 OS.SwitchSection(Sec);
246 OS.EmitIntValue(0, 4); // ri_gprmask
247 OS.EmitIntValue(0, 4); // ri_cpr[0]mask
248 OS.EmitIntValue(0, 4); // ri_cpr[1]mask
249 OS.EmitIntValue(0, 4); // ri_cpr[2]mask
250 OS.EmitIntValue(0, 4); // ri_cpr[3]mask
251 OS.EmitIntValue(0, 4); // ri_gp_value
255 void MipsTargetELFStreamer::emitAssignment(MCSymbol *Symbol,
256 const MCExpr *Value) {
257 // If on rhs is micromips symbol then mark Symbol as microMips.
258 if (Value->getKind() != MCExpr::SymbolRef)
260 const MCSymbol &RhsSym =
261 static_cast<const MCSymbolRefExpr *>(Value)->getSymbol();
262 MCSymbolData &Data = getStreamer().getOrCreateSymbolData(&RhsSym);
263 uint8_t Type = MCELF::GetType(Data);
264 if ((Type != ELF::STT_FUNC)
265 || !(MCELF::getOther(Data) & (ELF::STO_MIPS_MICROMIPS >> 2)))
268 MCSymbolData &SymbolData = getStreamer().getOrCreateSymbolData(Symbol);
269 // The "other" values are stored in the last 6 bits of the second byte.
270 // The traditional defines for STO values assume the full byte and thus
271 // the shift to pack it.
272 MCELF::setOther(SymbolData, ELF::STO_MIPS_MICROMIPS >> 2);
275 MCELFStreamer &MipsTargetELFStreamer::getStreamer() {
276 return static_cast<MCELFStreamer &>(Streamer);
279 void MipsTargetELFStreamer::emitDirectiveSetMicroMips() {
280 MicroMipsEnabled = true;
282 MCAssembler &MCA = getStreamer().getAssembler();
283 unsigned Flags = MCA.getELFHeaderEFlags();
284 Flags |= ELF::EF_MIPS_MICROMIPS;
285 MCA.setELFHeaderEFlags(Flags);
288 void MipsTargetELFStreamer::emitDirectiveSetNoMicroMips() {
289 MicroMipsEnabled = false;
292 void MipsTargetELFStreamer::emitDirectiveSetMips16() {
293 MCAssembler &MCA = getStreamer().getAssembler();
294 unsigned Flags = MCA.getELFHeaderEFlags();
295 Flags |= ELF::EF_MIPS_ARCH_ASE_M16;
296 MCA.setELFHeaderEFlags(Flags);
299 void MipsTargetELFStreamer::emitDirectiveSetNoMips16() {
303 void MipsTargetELFStreamer::emitDirectiveSetReorder() {
307 void MipsTargetELFStreamer::emitDirectiveSetNoReorder() {
308 MCAssembler &MCA = getStreamer().getAssembler();
309 unsigned Flags = MCA.getELFHeaderEFlags();
310 Flags |= ELF::EF_MIPS_NOREORDER;
311 MCA.setELFHeaderEFlags(Flags);
314 void MipsTargetELFStreamer::emitDirectiveSetMacro() {
318 void MipsTargetELFStreamer::emitDirectiveSetNoMacro() {
322 void MipsTargetELFStreamer::emitDirectiveSetAt() {
326 void MipsTargetELFStreamer::emitDirectiveSetNoAt() {
330 void MipsTargetELFStreamer::emitDirectiveEnd(StringRef Name) {
334 void MipsTargetELFStreamer::emitDirectiveEnt(const MCSymbol &Symbol) {
338 void MipsTargetELFStreamer::emitDirectiveAbiCalls() {
339 MCAssembler &MCA = getStreamer().getAssembler();
340 unsigned Flags = MCA.getELFHeaderEFlags();
341 Flags |= ELF::EF_MIPS_CPIC | ELF::EF_MIPS_PIC;
342 MCA.setELFHeaderEFlags(Flags);
345 void MipsTargetELFStreamer::emitDirectiveNaN2008() {
346 MCAssembler &MCA = getStreamer().getAssembler();
347 unsigned Flags = MCA.getELFHeaderEFlags();
348 Flags |= ELF::EF_MIPS_NAN2008;
349 MCA.setELFHeaderEFlags(Flags);
352 void MipsTargetELFStreamer::emitDirectiveNaNLegacy() {
353 MCAssembler &MCA = getStreamer().getAssembler();
354 unsigned Flags = MCA.getELFHeaderEFlags();
355 Flags &= ~ELF::EF_MIPS_NAN2008;
356 MCA.setELFHeaderEFlags(Flags);
359 void MipsTargetELFStreamer::emitDirectiveOptionPic0() {
360 MCAssembler &MCA = getStreamer().getAssembler();
361 unsigned Flags = MCA.getELFHeaderEFlags();
362 // This option overrides other PIC options like -KPIC.
364 Flags &= ~ELF::EF_MIPS_PIC;
365 MCA.setELFHeaderEFlags(Flags);
368 void MipsTargetELFStreamer::emitDirectiveOptionPic2() {
369 MCAssembler &MCA = getStreamer().getAssembler();
370 unsigned Flags = MCA.getELFHeaderEFlags();
372 // NOTE: We are following the GAS behaviour here which means the directive
373 // 'pic2' also sets the CPIC bit in the ELF header. This is different from
374 // what is stated in the SYSV ABI which consider the bits EF_MIPS_PIC and
375 // EF_MIPS_CPIC to be mutually exclusive.
376 Flags |= ELF::EF_MIPS_PIC | ELF::EF_MIPS_CPIC;
377 MCA.setELFHeaderEFlags(Flags);
380 void MipsTargetELFStreamer::emitFrame(unsigned StackReg, unsigned StackSize,
381 unsigned ReturnReg) {
385 void MipsTargetELFStreamer::emitMask(unsigned CPUBitmask,
386 int CPUTopSavedRegOff) {
390 void MipsTargetELFStreamer::emitFMask(unsigned FPUBitmask,
391 int FPUTopSavedRegOff) {
395 void MipsTargetELFStreamer::emitDirectiveSetMips32R2() {
396 // No action required for ELF output.
399 void MipsTargetELFStreamer::emitDirectiveSetMips64() {
400 // No action required for ELF output.
403 void MipsTargetELFStreamer::emitDirectiveSetMips64R2() {
404 // No action required for ELF output.
407 void MipsTargetELFStreamer::emitDirectiveSetDsp() {
408 // No action required for ELF output.
411 void MipsTargetELFStreamer::emitDirectiveCpload(unsigned RegNo) {
413 // This directive expands to:
414 // lui $gp, %hi(_gp_disp)
415 // addui $gp, $gp, %lo(_gp_disp)
416 // addu $gp, $gp, $reg
417 // when support for position independent code is enabled.
418 if (!Pic || (isN32() || isN64()))
421 // There's a GNU extension controlled by -mno-shared that allows
422 // locally-binding symbols to be accessed using absolute addresses.
423 // This is currently not supported. When supported -mno-shared makes
424 // .cpload expand to:
425 // lui $gp, %hi(__gnu_local_gp)
426 // addiu $gp, $gp, %lo(__gnu_local_gp)
428 StringRef SymName("_gp_disp");
429 MCAssembler &MCA = getStreamer().getAssembler();
430 MCSymbol *GP_Disp = MCA.getContext().GetOrCreateSymbol(SymName);
431 MCA.getOrCreateSymbolData(*GP_Disp);
434 TmpInst.setOpcode(Mips::LUi);
435 TmpInst.addOperand(MCOperand::CreateReg(Mips::GP));
436 const MCSymbolRefExpr *HiSym = MCSymbolRefExpr::Create(
437 "_gp_disp", MCSymbolRefExpr::VK_Mips_ABS_HI, MCA.getContext());
438 TmpInst.addOperand(MCOperand::CreateExpr(HiSym));
439 getStreamer().EmitInstruction(TmpInst, STI);
443 TmpInst.setOpcode(Mips::ADDiu);
444 TmpInst.addOperand(MCOperand::CreateReg(Mips::GP));
445 TmpInst.addOperand(MCOperand::CreateReg(Mips::GP));
446 const MCSymbolRefExpr *LoSym = MCSymbolRefExpr::Create(
447 "_gp_disp", MCSymbolRefExpr::VK_Mips_ABS_LO, MCA.getContext());
448 TmpInst.addOperand(MCOperand::CreateExpr(LoSym));
449 getStreamer().EmitInstruction(TmpInst, STI);
453 TmpInst.setOpcode(Mips::ADDu);
454 TmpInst.addOperand(MCOperand::CreateReg(Mips::GP));
455 TmpInst.addOperand(MCOperand::CreateReg(Mips::GP));
456 TmpInst.addOperand(MCOperand::CreateReg(RegNo));
457 getStreamer().EmitInstruction(TmpInst, STI);