1 //===-- MipsTargetStreamer.cpp - Mips Target Streamer Methods -------------===//
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 // This file provides Mips specific target streamer methods.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "MipsTargetStreamer.h"
14 #include "InstPrinter/MipsInstPrinter.h"
15 #include "MCTargetDesc/MipsABIInfo.h"
16 #include "MipsELFStreamer.h"
17 #include "MipsMCExpr.h"
18 #include "MipsMCTargetDesc.h"
19 #include "MipsTargetObjectFile.h"
20 #include "llvm/BinaryFormat/ELF.h"
21 #include "llvm/MC/MCContext.h"
22 #include "llvm/MC/MCSectionELF.h"
23 #include "llvm/MC/MCSubtargetInfo.h"
24 #include "llvm/MC/MCSymbolELF.h"
25 #include "llvm/Support/CommandLine.h"
26 #include "llvm/Support/ErrorHandling.h"
27 #include "llvm/Support/FormattedStream.h"
28 
29 using namespace llvm;
30 
31 namespace {
32 static cl::opt<bool> RoundSectionSizes(
33     "mips-round-section-sizes", cl::init(false),
34     cl::desc("Round section sizes up to the section alignment"), cl::Hidden);
35 } // end anonymous namespace
36 
37 MipsTargetStreamer::MipsTargetStreamer(MCStreamer &S)
38     : MCTargetStreamer(S), ModuleDirectiveAllowed(true) {
39   GPRInfoSet = FPRInfoSet = FrameInfoSet = false;
40 }
41 void MipsTargetStreamer::emitDirectiveSetMicroMips() {}
42 void MipsTargetStreamer::emitDirectiveSetNoMicroMips() {}
43 void MipsTargetStreamer::setUsesMicroMips() {}
44 void MipsTargetStreamer::emitDirectiveSetMips16() {}
45 void MipsTargetStreamer::emitDirectiveSetNoMips16() { forbidModuleDirective(); }
46 void MipsTargetStreamer::emitDirectiveSetReorder() { forbidModuleDirective(); }
47 void MipsTargetStreamer::emitDirectiveSetNoReorder() {}
48 void MipsTargetStreamer::emitDirectiveSetMacro() { forbidModuleDirective(); }
49 void MipsTargetStreamer::emitDirectiveSetNoMacro() { forbidModuleDirective(); }
50 void MipsTargetStreamer::emitDirectiveSetMsa() { forbidModuleDirective(); }
51 void MipsTargetStreamer::emitDirectiveSetNoMsa() { forbidModuleDirective(); }
52 void MipsTargetStreamer::emitDirectiveSetMt() {}
53 void MipsTargetStreamer::emitDirectiveSetNoMt() { forbidModuleDirective(); }
54 void MipsTargetStreamer::emitDirectiveSetCRC() {}
55 void MipsTargetStreamer::emitDirectiveSetNoCRC() {}
56 void MipsTargetStreamer::emitDirectiveSetVirt() {}
57 void MipsTargetStreamer::emitDirectiveSetNoVirt() {}
58 void MipsTargetStreamer::emitDirectiveSetGINV() {}
59 void MipsTargetStreamer::emitDirectiveSetNoGINV() {}
60 void MipsTargetStreamer::emitDirectiveSetAt() { forbidModuleDirective(); }
61 void MipsTargetStreamer::emitDirectiveSetAtWithArg(unsigned RegNo) {
62   forbidModuleDirective();
63 }
64 void MipsTargetStreamer::emitDirectiveSetNoAt() { forbidModuleDirective(); }
65 void MipsTargetStreamer::emitDirectiveEnd(StringRef Name) {}
66 void MipsTargetStreamer::emitDirectiveEnt(const MCSymbol &Symbol) {}
67 void MipsTargetStreamer::emitDirectiveAbiCalls() {}
68 void MipsTargetStreamer::emitDirectiveNaN2008() {}
69 void MipsTargetStreamer::emitDirectiveNaNLegacy() {}
70 void MipsTargetStreamer::emitDirectiveOptionPic0() {}
71 void MipsTargetStreamer::emitDirectiveOptionPic2() {}
72 void MipsTargetStreamer::emitDirectiveInsn() { forbidModuleDirective(); }
73 void MipsTargetStreamer::emitFrame(unsigned StackReg, unsigned StackSize,
74                                    unsigned ReturnReg) {}
75 void MipsTargetStreamer::emitMask(unsigned CPUBitmask, int CPUTopSavedRegOff) {}
76 void MipsTargetStreamer::emitFMask(unsigned FPUBitmask, int FPUTopSavedRegOff) {
77 }
78 void MipsTargetStreamer::emitDirectiveSetArch(StringRef Arch) {
79   forbidModuleDirective();
80 }
81 void MipsTargetStreamer::emitDirectiveSetMips0() { forbidModuleDirective(); }
82 void MipsTargetStreamer::emitDirectiveSetMips1() { forbidModuleDirective(); }
83 void MipsTargetStreamer::emitDirectiveSetMips2() { forbidModuleDirective(); }
84 void MipsTargetStreamer::emitDirectiveSetMips3() { forbidModuleDirective(); }
85 void MipsTargetStreamer::emitDirectiveSetMips4() { forbidModuleDirective(); }
86 void MipsTargetStreamer::emitDirectiveSetMips5() { forbidModuleDirective(); }
87 void MipsTargetStreamer::emitDirectiveSetMips32() { forbidModuleDirective(); }
88 void MipsTargetStreamer::emitDirectiveSetMips32R2() { forbidModuleDirective(); }
89 void MipsTargetStreamer::emitDirectiveSetMips32R3() { forbidModuleDirective(); }
90 void MipsTargetStreamer::emitDirectiveSetMips32R5() { forbidModuleDirective(); }
91 void MipsTargetStreamer::emitDirectiveSetMips32R6() { forbidModuleDirective(); }
92 void MipsTargetStreamer::emitDirectiveSetMips64() { forbidModuleDirective(); }
93 void MipsTargetStreamer::emitDirectiveSetMips64R2() { forbidModuleDirective(); }
94 void MipsTargetStreamer::emitDirectiveSetMips64R3() { forbidModuleDirective(); }
95 void MipsTargetStreamer::emitDirectiveSetMips64R5() { forbidModuleDirective(); }
96 void MipsTargetStreamer::emitDirectiveSetMips64R6() { forbidModuleDirective(); }
97 void MipsTargetStreamer::emitDirectiveSetPop() { forbidModuleDirective(); }
98 void MipsTargetStreamer::emitDirectiveSetPush() { forbidModuleDirective(); }
99 void MipsTargetStreamer::emitDirectiveSetSoftFloat() {
100   forbidModuleDirective();
101 }
102 void MipsTargetStreamer::emitDirectiveSetHardFloat() {
103   forbidModuleDirective();
104 }
105 void MipsTargetStreamer::emitDirectiveSetDsp() { forbidModuleDirective(); }
106 void MipsTargetStreamer::emitDirectiveSetDspr2() { forbidModuleDirective(); }
107 void MipsTargetStreamer::emitDirectiveSetNoDsp() { forbidModuleDirective(); }
108 void MipsTargetStreamer::emitDirectiveCpLoad(unsigned RegNo) {}
109 bool MipsTargetStreamer::emitDirectiveCpRestore(
110     int Offset, function_ref<unsigned()> GetATReg, SMLoc IDLoc,
111     const MCSubtargetInfo *STI) {
112   forbidModuleDirective();
113   return true;
114 }
115 void MipsTargetStreamer::emitDirectiveCpsetup(unsigned RegNo, int RegOrOffset,
116                                               const MCSymbol &Sym, bool IsReg) {
117 }
118 void MipsTargetStreamer::emitDirectiveCpreturn(unsigned SaveLocation,
119                                                bool SaveLocationIsRegister) {}
120 
121 void MipsTargetStreamer::emitDirectiveModuleFP() {}
122 
123 void MipsTargetStreamer::emitDirectiveModuleOddSPReg() {
124   if (!ABIFlagsSection.OddSPReg && !ABIFlagsSection.Is32BitABI)
125     report_fatal_error("+nooddspreg is only valid for O32");
126 }
127 void MipsTargetStreamer::emitDirectiveModuleSoftFloat() {}
128 void MipsTargetStreamer::emitDirectiveModuleHardFloat() {}
129 void MipsTargetStreamer::emitDirectiveModuleMT() {}
130 void MipsTargetStreamer::emitDirectiveModuleCRC() {}
131 void MipsTargetStreamer::emitDirectiveModuleNoCRC() {}
132 void MipsTargetStreamer::emitDirectiveModuleVirt() {}
133 void MipsTargetStreamer::emitDirectiveModuleNoVirt() {}
134 void MipsTargetStreamer::emitDirectiveModuleGINV() {}
135 void MipsTargetStreamer::emitDirectiveModuleNoGINV() {}
136 void MipsTargetStreamer::emitDirectiveSetFp(
137     MipsABIFlagsSection::FpABIKind Value) {
138   forbidModuleDirective();
139 }
140 void MipsTargetStreamer::emitDirectiveSetOddSPReg() { forbidModuleDirective(); }
141 void MipsTargetStreamer::emitDirectiveSetNoOddSPReg() {
142   forbidModuleDirective();
143 }
144 
145 void MipsTargetStreamer::emitR(unsigned Opcode, unsigned Reg0, SMLoc IDLoc,
146                                const MCSubtargetInfo *STI) {
147   MCInst TmpInst;
148   TmpInst.setOpcode(Opcode);
149   TmpInst.addOperand(MCOperand::createReg(Reg0));
150   TmpInst.setLoc(IDLoc);
151   getStreamer().EmitInstruction(TmpInst, *STI);
152 }
153 
154 void MipsTargetStreamer::emitRX(unsigned Opcode, unsigned Reg0, MCOperand Op1,
155                                 SMLoc IDLoc, const MCSubtargetInfo *STI) {
156   MCInst TmpInst;
157   TmpInst.setOpcode(Opcode);
158   TmpInst.addOperand(MCOperand::createReg(Reg0));
159   TmpInst.addOperand(Op1);
160   TmpInst.setLoc(IDLoc);
161   getStreamer().EmitInstruction(TmpInst, *STI);
162 }
163 
164 void MipsTargetStreamer::emitRI(unsigned Opcode, unsigned Reg0, int32_t Imm,
165                                 SMLoc IDLoc, const MCSubtargetInfo *STI) {
166   emitRX(Opcode, Reg0, MCOperand::createImm(Imm), IDLoc, STI);
167 }
168 
169 void MipsTargetStreamer::emitRR(unsigned Opcode, unsigned Reg0, unsigned Reg1,
170                                 SMLoc IDLoc, const MCSubtargetInfo *STI) {
171   emitRX(Opcode, Reg0, MCOperand::createReg(Reg1), IDLoc, STI);
172 }
173 
174 void MipsTargetStreamer::emitII(unsigned Opcode, int16_t Imm1, int16_t Imm2,
175                                 SMLoc IDLoc, const MCSubtargetInfo *STI) {
176   MCInst TmpInst;
177   TmpInst.setOpcode(Opcode);
178   TmpInst.addOperand(MCOperand::createImm(Imm1));
179   TmpInst.addOperand(MCOperand::createImm(Imm2));
180   TmpInst.setLoc(IDLoc);
181   getStreamer().EmitInstruction(TmpInst, *STI);
182 }
183 
184 void MipsTargetStreamer::emitRRX(unsigned Opcode, unsigned Reg0, unsigned Reg1,
185                                  MCOperand Op2, SMLoc IDLoc,
186                                  const MCSubtargetInfo *STI) {
187   MCInst TmpInst;
188   TmpInst.setOpcode(Opcode);
189   TmpInst.addOperand(MCOperand::createReg(Reg0));
190   TmpInst.addOperand(MCOperand::createReg(Reg1));
191   TmpInst.addOperand(Op2);
192   TmpInst.setLoc(IDLoc);
193   getStreamer().EmitInstruction(TmpInst, *STI);
194 }
195 
196 void MipsTargetStreamer::emitRRR(unsigned Opcode, unsigned Reg0, unsigned Reg1,
197                                  unsigned Reg2, SMLoc IDLoc,
198                                  const MCSubtargetInfo *STI) {
199   emitRRX(Opcode, Reg0, Reg1, MCOperand::createReg(Reg2), IDLoc, STI);
200 }
201 
202 void MipsTargetStreamer::emitRRI(unsigned Opcode, unsigned Reg0, unsigned Reg1,
203                                  int16_t Imm, SMLoc IDLoc,
204                                  const MCSubtargetInfo *STI) {
205   emitRRX(Opcode, Reg0, Reg1, MCOperand::createImm(Imm), IDLoc, STI);
206 }
207 
208 void MipsTargetStreamer::emitRRIII(unsigned Opcode, unsigned Reg0,
209                                    unsigned Reg1, int16_t Imm0, int16_t Imm1,
210                                    int16_t Imm2, SMLoc IDLoc,
211                                    const MCSubtargetInfo *STI) {
212   MCInst TmpInst;
213   TmpInst.setOpcode(Opcode);
214   TmpInst.addOperand(MCOperand::createReg(Reg0));
215   TmpInst.addOperand(MCOperand::createReg(Reg1));
216   TmpInst.addOperand(MCOperand::createImm(Imm0));
217   TmpInst.addOperand(MCOperand::createImm(Imm1));
218   TmpInst.addOperand(MCOperand::createImm(Imm2));
219   TmpInst.setLoc(IDLoc);
220   getStreamer().EmitInstruction(TmpInst, *STI);
221 }
222 
223 void MipsTargetStreamer::emitAddu(unsigned DstReg, unsigned SrcReg,
224                                   unsigned TrgReg, bool Is64Bit,
225                                   const MCSubtargetInfo *STI) {
226   emitRRR(Is64Bit ? Mips::DADDu : Mips::ADDu, DstReg, SrcReg, TrgReg, SMLoc(),
227           STI);
228 }
229 
230 void MipsTargetStreamer::emitDSLL(unsigned DstReg, unsigned SrcReg,
231                                   int16_t ShiftAmount, SMLoc IDLoc,
232                                   const MCSubtargetInfo *STI) {
233   if (ShiftAmount >= 32) {
234     emitRRI(Mips::DSLL32, DstReg, SrcReg, ShiftAmount - 32, IDLoc, STI);
235     return;
236   }
237 
238   emitRRI(Mips::DSLL, DstReg, SrcReg, ShiftAmount, IDLoc, STI);
239 }
240 
241 void MipsTargetStreamer::emitEmptyDelaySlot(bool hasShortDelaySlot, SMLoc IDLoc,
242                                             const MCSubtargetInfo *STI) {
243   if (hasShortDelaySlot)
244     emitRR(Mips::MOVE16_MM, Mips::ZERO, Mips::ZERO, IDLoc, STI);
245   else
246     emitRRI(Mips::SLL, Mips::ZERO, Mips::ZERO, 0, IDLoc, STI);
247 }
248 
249 void MipsTargetStreamer::emitNop(SMLoc IDLoc, const MCSubtargetInfo *STI) {
250   const FeatureBitset &Features = STI->getFeatureBits();
251   if (Features[Mips::FeatureMicroMips])
252     emitRR(Mips::MOVE16_MM, Mips::ZERO, Mips::ZERO, IDLoc, STI);
253   else
254     emitRRI(Mips::SLL, Mips::ZERO, Mips::ZERO, 0, IDLoc, STI);
255 }
256 
257 /// Emit the $gp restore operation for .cprestore.
258 void MipsTargetStreamer::emitGPRestore(int Offset, SMLoc IDLoc,
259                                        const MCSubtargetInfo *STI) {
260   emitLoadWithImmOffset(Mips::LW, Mips::GP, Mips::SP, Offset, Mips::GP, IDLoc,
261                         STI);
262 }
263 
264 /// Emit a store instruction with an immediate offset.
265 void MipsTargetStreamer::emitStoreWithImmOffset(
266     unsigned Opcode, unsigned SrcReg, unsigned BaseReg, int64_t Offset,
267     function_ref<unsigned()> GetATReg, SMLoc IDLoc,
268     const MCSubtargetInfo *STI) {
269   if (isInt<16>(Offset)) {
270     emitRRI(Opcode, SrcReg, BaseReg, Offset, IDLoc, STI);
271     return;
272   }
273 
274   // sw $8, offset($8) => lui $at, %hi(offset)
275   //                      add $at, $at, $8
276   //                      sw $8, %lo(offset)($at)
277 
278   unsigned ATReg = GetATReg();
279   if (!ATReg)
280     return;
281 
282   unsigned LoOffset = Offset & 0x0000ffff;
283   unsigned HiOffset = (Offset & 0xffff0000) >> 16;
284 
285   // If msb of LoOffset is 1(negative number) we must increment HiOffset
286   // to account for the sign-extension of the low part.
287   if (LoOffset & 0x8000)
288     HiOffset++;
289 
290   // Generate the base address in ATReg.
291   emitRI(Mips::LUi, ATReg, HiOffset, IDLoc, STI);
292   if (BaseReg != Mips::ZERO)
293     emitRRR(Mips::ADDu, ATReg, ATReg, BaseReg, IDLoc, STI);
294   // Emit the store with the adjusted base and offset.
295   emitRRI(Opcode, SrcReg, ATReg, LoOffset, IDLoc, STI);
296 }
297 
298 /// Emit a store instruction with an symbol offset. Symbols are assumed to be
299 /// out of range for a simm16 will be expanded to appropriate instructions.
300 void MipsTargetStreamer::emitStoreWithSymOffset(
301     unsigned Opcode, unsigned SrcReg, unsigned BaseReg, MCOperand &HiOperand,
302     MCOperand &LoOperand, unsigned ATReg, SMLoc IDLoc,
303     const MCSubtargetInfo *STI) {
304   // sw $8, sym => lui $at, %hi(sym)
305   //               sw $8, %lo(sym)($at)
306 
307   // Generate the base address in ATReg.
308   emitRX(Mips::LUi, ATReg, HiOperand, IDLoc, STI);
309   if (BaseReg != Mips::ZERO)
310     emitRRR(Mips::ADDu, ATReg, ATReg, BaseReg, IDLoc, STI);
311   // Emit the store with the adjusted base and offset.
312   emitRRX(Opcode, SrcReg, ATReg, LoOperand, IDLoc, STI);
313 }
314 
315 /// Emit a load instruction with an immediate offset. DstReg and TmpReg are
316 /// permitted to be the same register iff DstReg is distinct from BaseReg and
317 /// DstReg is a GPR. It is the callers responsibility to identify such cases
318 /// and pass the appropriate register in TmpReg.
319 void MipsTargetStreamer::emitLoadWithImmOffset(unsigned Opcode, unsigned DstReg,
320                                                unsigned BaseReg, int64_t Offset,
321                                                unsigned TmpReg, SMLoc IDLoc,
322                                                const MCSubtargetInfo *STI) {
323   if (isInt<16>(Offset)) {
324     emitRRI(Opcode, DstReg, BaseReg, Offset, IDLoc, STI);
325     return;
326   }
327 
328   // 1) lw $8, offset($9) => lui $8, %hi(offset)
329   //                         add $8, $8, $9
330   //                         lw $8, %lo(offset)($9)
331   // 2) lw $8, offset($8) => lui $at, %hi(offset)
332   //                         add $at, $at, $8
333   //                         lw $8, %lo(offset)($at)
334 
335   unsigned LoOffset = Offset & 0x0000ffff;
336   unsigned HiOffset = (Offset & 0xffff0000) >> 16;
337 
338   // If msb of LoOffset is 1(negative number) we must increment HiOffset
339   // to account for the sign-extension of the low part.
340   if (LoOffset & 0x8000)
341     HiOffset++;
342 
343   // Generate the base address in TmpReg.
344   emitRI(Mips::LUi, TmpReg, HiOffset, IDLoc, STI);
345   if (BaseReg != Mips::ZERO)
346     emitRRR(Mips::ADDu, TmpReg, TmpReg, BaseReg, IDLoc, STI);
347   // Emit the load with the adjusted base and offset.
348   emitRRI(Opcode, DstReg, TmpReg, LoOffset, IDLoc, STI);
349 }
350 
351 /// Emit a load instruction with an symbol offset. Symbols are assumed to be
352 /// out of range for a simm16 will be expanded to appropriate instructions.
353 /// DstReg and TmpReg are permitted to be the same register iff DstReg is a
354 /// GPR. It is the callers responsibility to identify such cases and pass the
355 /// appropriate register in TmpReg.
356 void MipsTargetStreamer::emitLoadWithSymOffset(unsigned Opcode, unsigned DstReg,
357                                                unsigned BaseReg,
358                                                MCOperand &HiOperand,
359                                                MCOperand &LoOperand,
360                                                unsigned TmpReg, SMLoc IDLoc,
361                                                const MCSubtargetInfo *STI) {
362   // 1) lw $8, sym        => lui $8, %hi(sym)
363   //                         lw $8, %lo(sym)($8)
364   // 2) ldc1 $f0, sym     => lui $at, %hi(sym)
365   //                         ldc1 $f0, %lo(sym)($at)
366 
367   // Generate the base address in TmpReg.
368   emitRX(Mips::LUi, TmpReg, HiOperand, IDLoc, STI);
369   if (BaseReg != Mips::ZERO)
370     emitRRR(Mips::ADDu, TmpReg, TmpReg, BaseReg, IDLoc, STI);
371   // Emit the load with the adjusted base and offset.
372   emitRRX(Opcode, DstReg, TmpReg, LoOperand, IDLoc, STI);
373 }
374 
375 MipsTargetAsmStreamer::MipsTargetAsmStreamer(MCStreamer &S,
376                                              formatted_raw_ostream &OS)
377     : MipsTargetStreamer(S), OS(OS) {}
378 
379 void MipsTargetAsmStreamer::emitDirectiveSetMicroMips() {
380   OS << "\t.set\tmicromips\n";
381   forbidModuleDirective();
382 }
383 
384 void MipsTargetAsmStreamer::emitDirectiveSetNoMicroMips() {
385   OS << "\t.set\tnomicromips\n";
386   forbidModuleDirective();
387 }
388 
389 void MipsTargetAsmStreamer::emitDirectiveSetMips16() {
390   OS << "\t.set\tmips16\n";
391   forbidModuleDirective();
392 }
393 
394 void MipsTargetAsmStreamer::emitDirectiveSetNoMips16() {
395   OS << "\t.set\tnomips16\n";
396   MipsTargetStreamer::emitDirectiveSetNoMips16();
397 }
398 
399 void MipsTargetAsmStreamer::emitDirectiveSetReorder() {
400   OS << "\t.set\treorder\n";
401   MipsTargetStreamer::emitDirectiveSetReorder();
402 }
403 
404 void MipsTargetAsmStreamer::emitDirectiveSetNoReorder() {
405   OS << "\t.set\tnoreorder\n";
406   forbidModuleDirective();
407 }
408 
409 void MipsTargetAsmStreamer::emitDirectiveSetMacro() {
410   OS << "\t.set\tmacro\n";
411   MipsTargetStreamer::emitDirectiveSetMacro();
412 }
413 
414 void MipsTargetAsmStreamer::emitDirectiveSetNoMacro() {
415   OS << "\t.set\tnomacro\n";
416   MipsTargetStreamer::emitDirectiveSetNoMacro();
417 }
418 
419 void MipsTargetAsmStreamer::emitDirectiveSetMsa() {
420   OS << "\t.set\tmsa\n";
421   MipsTargetStreamer::emitDirectiveSetMsa();
422 }
423 
424 void MipsTargetAsmStreamer::emitDirectiveSetNoMsa() {
425   OS << "\t.set\tnomsa\n";
426   MipsTargetStreamer::emitDirectiveSetNoMsa();
427 }
428 
429 void MipsTargetAsmStreamer::emitDirectiveSetMt() {
430   OS << "\t.set\tmt\n";
431   MipsTargetStreamer::emitDirectiveSetMt();
432 }
433 
434 void MipsTargetAsmStreamer::emitDirectiveSetNoMt() {
435   OS << "\t.set\tnomt\n";
436   MipsTargetStreamer::emitDirectiveSetNoMt();
437 }
438 
439 void MipsTargetAsmStreamer::emitDirectiveSetCRC() {
440   OS << "\t.set\tcrc\n";
441   MipsTargetStreamer::emitDirectiveSetCRC();
442 }
443 
444 void MipsTargetAsmStreamer::emitDirectiveSetNoCRC() {
445   OS << "\t.set\tnocrc\n";
446   MipsTargetStreamer::emitDirectiveSetNoCRC();
447 }
448 
449 void MipsTargetAsmStreamer::emitDirectiveSetVirt() {
450   OS << "\t.set\tvirt\n";
451   MipsTargetStreamer::emitDirectiveSetVirt();
452 }
453 
454 void MipsTargetAsmStreamer::emitDirectiveSetNoVirt() {
455   OS << "\t.set\tnovirt\n";
456   MipsTargetStreamer::emitDirectiveSetNoVirt();
457 }
458 
459 void MipsTargetAsmStreamer::emitDirectiveSetGINV() {
460   OS << "\t.set\tginv\n";
461   MipsTargetStreamer::emitDirectiveSetGINV();
462 }
463 
464 void MipsTargetAsmStreamer::emitDirectiveSetNoGINV() {
465   OS << "\t.set\tnoginv\n";
466   MipsTargetStreamer::emitDirectiveSetNoGINV();
467 }
468 
469 void MipsTargetAsmStreamer::emitDirectiveSetAt() {
470   OS << "\t.set\tat\n";
471   MipsTargetStreamer::emitDirectiveSetAt();
472 }
473 
474 void MipsTargetAsmStreamer::emitDirectiveSetAtWithArg(unsigned RegNo) {
475   OS << "\t.set\tat=$" << Twine(RegNo) << "\n";
476   MipsTargetStreamer::emitDirectiveSetAtWithArg(RegNo);
477 }
478 
479 void MipsTargetAsmStreamer::emitDirectiveSetNoAt() {
480   OS << "\t.set\tnoat\n";
481   MipsTargetStreamer::emitDirectiveSetNoAt();
482 }
483 
484 void MipsTargetAsmStreamer::emitDirectiveEnd(StringRef Name) {
485   OS << "\t.end\t" << Name << '\n';
486 }
487 
488 void MipsTargetAsmStreamer::emitDirectiveEnt(const MCSymbol &Symbol) {
489   OS << "\t.ent\t" << Symbol.getName() << '\n';
490 }
491 
492 void MipsTargetAsmStreamer::emitDirectiveAbiCalls() { OS << "\t.abicalls\n"; }
493 
494 void MipsTargetAsmStreamer::emitDirectiveNaN2008() { OS << "\t.nan\t2008\n"; }
495 
496 void MipsTargetAsmStreamer::emitDirectiveNaNLegacy() {
497   OS << "\t.nan\tlegacy\n";
498 }
499 
500 void MipsTargetAsmStreamer::emitDirectiveOptionPic0() {
501   OS << "\t.option\tpic0\n";
502 }
503 
504 void MipsTargetAsmStreamer::emitDirectiveOptionPic2() {
505   OS << "\t.option\tpic2\n";
506 }
507 
508 void MipsTargetAsmStreamer::emitDirectiveInsn() {
509   MipsTargetStreamer::emitDirectiveInsn();
510   OS << "\t.insn\n";
511 }
512 
513 void MipsTargetAsmStreamer::emitFrame(unsigned StackReg, unsigned StackSize,
514                                       unsigned ReturnReg) {
515   OS << "\t.frame\t$"
516      << StringRef(MipsInstPrinter::getRegisterName(StackReg)).lower() << ","
517      << StackSize << ",$"
518      << StringRef(MipsInstPrinter::getRegisterName(ReturnReg)).lower() << '\n';
519 }
520 
521 void MipsTargetAsmStreamer::emitDirectiveSetArch(StringRef Arch) {
522   OS << "\t.set arch=" << Arch << "\n";
523   MipsTargetStreamer::emitDirectiveSetArch(Arch);
524 }
525 
526 void MipsTargetAsmStreamer::emitDirectiveSetMips0() {
527   OS << "\t.set\tmips0\n";
528   MipsTargetStreamer::emitDirectiveSetMips0();
529 }
530 
531 void MipsTargetAsmStreamer::emitDirectiveSetMips1() {
532   OS << "\t.set\tmips1\n";
533   MipsTargetStreamer::emitDirectiveSetMips1();
534 }
535 
536 void MipsTargetAsmStreamer::emitDirectiveSetMips2() {
537   OS << "\t.set\tmips2\n";
538   MipsTargetStreamer::emitDirectiveSetMips2();
539 }
540 
541 void MipsTargetAsmStreamer::emitDirectiveSetMips3() {
542   OS << "\t.set\tmips3\n";
543   MipsTargetStreamer::emitDirectiveSetMips3();
544 }
545 
546 void MipsTargetAsmStreamer::emitDirectiveSetMips4() {
547   OS << "\t.set\tmips4\n";
548   MipsTargetStreamer::emitDirectiveSetMips4();
549 }
550 
551 void MipsTargetAsmStreamer::emitDirectiveSetMips5() {
552   OS << "\t.set\tmips5\n";
553   MipsTargetStreamer::emitDirectiveSetMips5();
554 }
555 
556 void MipsTargetAsmStreamer::emitDirectiveSetMips32() {
557   OS << "\t.set\tmips32\n";
558   MipsTargetStreamer::emitDirectiveSetMips32();
559 }
560 
561 void MipsTargetAsmStreamer::emitDirectiveSetMips32R2() {
562   OS << "\t.set\tmips32r2\n";
563   MipsTargetStreamer::emitDirectiveSetMips32R2();
564 }
565 
566 void MipsTargetAsmStreamer::emitDirectiveSetMips32R3() {
567   OS << "\t.set\tmips32r3\n";
568   MipsTargetStreamer::emitDirectiveSetMips32R3();
569 }
570 
571 void MipsTargetAsmStreamer::emitDirectiveSetMips32R5() {
572   OS << "\t.set\tmips32r5\n";
573   MipsTargetStreamer::emitDirectiveSetMips32R5();
574 }
575 
576 void MipsTargetAsmStreamer::emitDirectiveSetMips32R6() {
577   OS << "\t.set\tmips32r6\n";
578   MipsTargetStreamer::emitDirectiveSetMips32R6();
579 }
580 
581 void MipsTargetAsmStreamer::emitDirectiveSetMips64() {
582   OS << "\t.set\tmips64\n";
583   MipsTargetStreamer::emitDirectiveSetMips64();
584 }
585 
586 void MipsTargetAsmStreamer::emitDirectiveSetMips64R2() {
587   OS << "\t.set\tmips64r2\n";
588   MipsTargetStreamer::emitDirectiveSetMips64R2();
589 }
590 
591 void MipsTargetAsmStreamer::emitDirectiveSetMips64R3() {
592   OS << "\t.set\tmips64r3\n";
593   MipsTargetStreamer::emitDirectiveSetMips64R3();
594 }
595 
596 void MipsTargetAsmStreamer::emitDirectiveSetMips64R5() {
597   OS << "\t.set\tmips64r5\n";
598   MipsTargetStreamer::emitDirectiveSetMips64R5();
599 }
600 
601 void MipsTargetAsmStreamer::emitDirectiveSetMips64R6() {
602   OS << "\t.set\tmips64r6\n";
603   MipsTargetStreamer::emitDirectiveSetMips64R6();
604 }
605 
606 void MipsTargetAsmStreamer::emitDirectiveSetDsp() {
607   OS << "\t.set\tdsp\n";
608   MipsTargetStreamer::emitDirectiveSetDsp();
609 }
610 
611 void MipsTargetAsmStreamer::emitDirectiveSetDspr2() {
612   OS << "\t.set\tdspr2\n";
613   MipsTargetStreamer::emitDirectiveSetDspr2();
614 }
615 
616 void MipsTargetAsmStreamer::emitDirectiveSetNoDsp() {
617   OS << "\t.set\tnodsp\n";
618   MipsTargetStreamer::emitDirectiveSetNoDsp();
619 }
620 
621 void MipsTargetAsmStreamer::emitDirectiveSetPop() {
622   OS << "\t.set\tpop\n";
623   MipsTargetStreamer::emitDirectiveSetPop();
624 }
625 
626 void MipsTargetAsmStreamer::emitDirectiveSetPush() {
627  OS << "\t.set\tpush\n";
628  MipsTargetStreamer::emitDirectiveSetPush();
629 }
630 
631 void MipsTargetAsmStreamer::emitDirectiveSetSoftFloat() {
632   OS << "\t.set\tsoftfloat\n";
633   MipsTargetStreamer::emitDirectiveSetSoftFloat();
634 }
635 
636 void MipsTargetAsmStreamer::emitDirectiveSetHardFloat() {
637   OS << "\t.set\thardfloat\n";
638   MipsTargetStreamer::emitDirectiveSetHardFloat();
639 }
640 
641 // Print a 32 bit hex number with all numbers.
642 static void printHex32(unsigned Value, raw_ostream &OS) {
643   OS << "0x";
644   for (int i = 7; i >= 0; i--)
645     OS.write_hex((Value & (0xF << (i * 4))) >> (i * 4));
646 }
647 
648 void MipsTargetAsmStreamer::emitMask(unsigned CPUBitmask,
649                                      int CPUTopSavedRegOff) {
650   OS << "\t.mask \t";
651   printHex32(CPUBitmask, OS);
652   OS << ',' << CPUTopSavedRegOff << '\n';
653 }
654 
655 void MipsTargetAsmStreamer::emitFMask(unsigned FPUBitmask,
656                                       int FPUTopSavedRegOff) {
657   OS << "\t.fmask\t";
658   printHex32(FPUBitmask, OS);
659   OS << "," << FPUTopSavedRegOff << '\n';
660 }
661 
662 void MipsTargetAsmStreamer::emitDirectiveCpLoad(unsigned RegNo) {
663   OS << "\t.cpload\t$"
664      << StringRef(MipsInstPrinter::getRegisterName(RegNo)).lower() << "\n";
665   forbidModuleDirective();
666 }
667 
668 bool MipsTargetAsmStreamer::emitDirectiveCpRestore(
669     int Offset, function_ref<unsigned()> GetATReg, SMLoc IDLoc,
670     const MCSubtargetInfo *STI) {
671   MipsTargetStreamer::emitDirectiveCpRestore(Offset, GetATReg, IDLoc, STI);
672   OS << "\t.cprestore\t" << Offset << "\n";
673   return true;
674 }
675 
676 void MipsTargetAsmStreamer::emitDirectiveCpsetup(unsigned RegNo,
677                                                  int RegOrOffset,
678                                                  const MCSymbol &Sym,
679                                                  bool IsReg) {
680   OS << "\t.cpsetup\t$"
681      << StringRef(MipsInstPrinter::getRegisterName(RegNo)).lower() << ", ";
682 
683   if (IsReg)
684     OS << "$"
685        << StringRef(MipsInstPrinter::getRegisterName(RegOrOffset)).lower();
686   else
687     OS << RegOrOffset;
688 
689   OS << ", ";
690 
691   OS << Sym.getName();
692   forbidModuleDirective();
693 }
694 
695 void MipsTargetAsmStreamer::emitDirectiveCpreturn(unsigned SaveLocation,
696                                                   bool SaveLocationIsRegister) {
697   OS << "\t.cpreturn";
698   forbidModuleDirective();
699 }
700 
701 void MipsTargetAsmStreamer::emitDirectiveModuleFP() {
702   MipsABIFlagsSection::FpABIKind FpABI = ABIFlagsSection.getFpABI();
703   if (FpABI == MipsABIFlagsSection::FpABIKind::SOFT)
704     OS << "\t.module\tsoftfloat\n";
705   else
706     OS << "\t.module\tfp=" << ABIFlagsSection.getFpABIString(FpABI) << "\n";
707 }
708 
709 void MipsTargetAsmStreamer::emitDirectiveSetFp(
710     MipsABIFlagsSection::FpABIKind Value) {
711   MipsTargetStreamer::emitDirectiveSetFp(Value);
712 
713   OS << "\t.set\tfp=";
714   OS << ABIFlagsSection.getFpABIString(Value) << "\n";
715 }
716 
717 void MipsTargetAsmStreamer::emitDirectiveModuleOddSPReg() {
718   MipsTargetStreamer::emitDirectiveModuleOddSPReg();
719 
720   OS << "\t.module\t" << (ABIFlagsSection.OddSPReg ? "" : "no") << "oddspreg\n";
721 }
722 
723 void MipsTargetAsmStreamer::emitDirectiveSetOddSPReg() {
724   MipsTargetStreamer::emitDirectiveSetOddSPReg();
725   OS << "\t.set\toddspreg\n";
726 }
727 
728 void MipsTargetAsmStreamer::emitDirectiveSetNoOddSPReg() {
729   MipsTargetStreamer::emitDirectiveSetNoOddSPReg();
730   OS << "\t.set\tnooddspreg\n";
731 }
732 
733 void MipsTargetAsmStreamer::emitDirectiveModuleSoftFloat() {
734   OS << "\t.module\tsoftfloat\n";
735 }
736 
737 void MipsTargetAsmStreamer::emitDirectiveModuleHardFloat() {
738   OS << "\t.module\thardfloat\n";
739 }
740 
741 void MipsTargetAsmStreamer::emitDirectiveModuleMT() {
742   OS << "\t.module\tmt\n";
743 }
744 
745 void MipsTargetAsmStreamer::emitDirectiveModuleCRC() {
746   OS << "\t.module\tcrc\n";
747 }
748 
749 void MipsTargetAsmStreamer::emitDirectiveModuleNoCRC() {
750   OS << "\t.module\tnocrc\n";
751 }
752 
753 void MipsTargetAsmStreamer::emitDirectiveModuleVirt() {
754   OS << "\t.module\tvirt\n";
755 }
756 
757 void MipsTargetAsmStreamer::emitDirectiveModuleNoVirt() {
758   OS << "\t.module\tnovirt\n";
759 }
760 
761 void MipsTargetAsmStreamer::emitDirectiveModuleGINV() {
762   OS << "\t.module\tginv\n";
763 }
764 
765 void MipsTargetAsmStreamer::emitDirectiveModuleNoGINV() {
766   OS << "\t.module\tnoginv\n";
767 }
768 
769 // This part is for ELF object output.
770 MipsTargetELFStreamer::MipsTargetELFStreamer(MCStreamer &S,
771                                              const MCSubtargetInfo &STI)
772     : MipsTargetStreamer(S), MicroMipsEnabled(false), STI(STI) {
773   MCAssembler &MCA = getStreamer().getAssembler();
774 
775   // It's possible that MCObjectFileInfo isn't fully initialized at this point
776   // due to an initialization order problem where LLVMTargetMachine creates the
777   // target streamer before TargetLoweringObjectFile calls
778   // InitializeMCObjectFileInfo. There doesn't seem to be a single place that
779   // covers all cases so this statement covers most cases and direct object
780   // emission must call setPic() once MCObjectFileInfo has been initialized. The
781   // cases we don't handle here are covered by MipsAsmPrinter.
782   Pic = MCA.getContext().getObjectFileInfo()->isPositionIndependent();
783 
784   const FeatureBitset &Features = STI.getFeatureBits();
785 
786   // Set the header flags that we can in the constructor.
787   // FIXME: This is a fairly terrible hack. We set the rest
788   // of these in the destructor. The problem here is two-fold:
789   //
790   // a: Some of the eflags can be set/reset by directives.
791   // b: There aren't any usage paths that initialize the ABI
792   //    pointer until after we initialize either an assembler
793   //    or the target machine.
794   // We can fix this by making the target streamer construct
795   // the ABI, but this is fraught with wide ranging dependency
796   // issues as well.
797   unsigned EFlags = MCA.getELFHeaderEFlags();
798 
799   // FIXME: Fix a dependency issue by instantiating the ABI object to some
800   // default based off the triple. The triple doesn't describe the target
801   // fully, but any external user of the API that uses the MCTargetStreamer
802   // would otherwise crash on assertion failure.
803 
804   ABI = MipsABIInfo(
805       STI.getTargetTriple().getArch() == Triple::ArchType::mipsel ||
806               STI.getTargetTriple().getArch() == Triple::ArchType::mips
807           ? MipsABIInfo::O32()
808           : MipsABIInfo::N64());
809 
810   // Architecture
811   if (Features[Mips::FeatureMips64r6])
812     EFlags |= ELF::EF_MIPS_ARCH_64R6;
813   else if (Features[Mips::FeatureMips64r2] ||
814            Features[Mips::FeatureMips64r3] ||
815            Features[Mips::FeatureMips64r5])
816     EFlags |= ELF::EF_MIPS_ARCH_64R2;
817   else if (Features[Mips::FeatureMips64])
818     EFlags |= ELF::EF_MIPS_ARCH_64;
819   else if (Features[Mips::FeatureMips5])
820     EFlags |= ELF::EF_MIPS_ARCH_5;
821   else if (Features[Mips::FeatureMips4])
822     EFlags |= ELF::EF_MIPS_ARCH_4;
823   else if (Features[Mips::FeatureMips3])
824     EFlags |= ELF::EF_MIPS_ARCH_3;
825   else if (Features[Mips::FeatureMips32r6])
826     EFlags |= ELF::EF_MIPS_ARCH_32R6;
827   else if (Features[Mips::FeatureMips32r2] ||
828            Features[Mips::FeatureMips32r3] ||
829            Features[Mips::FeatureMips32r5])
830     EFlags |= ELF::EF_MIPS_ARCH_32R2;
831   else if (Features[Mips::FeatureMips32])
832     EFlags |= ELF::EF_MIPS_ARCH_32;
833   else if (Features[Mips::FeatureMips2])
834     EFlags |= ELF::EF_MIPS_ARCH_2;
835   else
836     EFlags |= ELF::EF_MIPS_ARCH_1;
837 
838   // Machine
839   if (Features[Mips::FeatureCnMips])
840     EFlags |= ELF::EF_MIPS_MACH_OCTEON;
841 
842   // Other options.
843   if (Features[Mips::FeatureNaN2008])
844     EFlags |= ELF::EF_MIPS_NAN2008;
845 
846   MCA.setELFHeaderEFlags(EFlags);
847 }
848 
849 void MipsTargetELFStreamer::emitLabel(MCSymbol *S) {
850   auto *Symbol = cast<MCSymbolELF>(S);
851   getStreamer().getAssembler().registerSymbol(*Symbol);
852   uint8_t Type = Symbol->getType();
853   if (Type != ELF::STT_FUNC)
854     return;
855 
856   if (isMicroMipsEnabled())
857     Symbol->setOther(ELF::STO_MIPS_MICROMIPS);
858 }
859 
860 void MipsTargetELFStreamer::finish() {
861   MCAssembler &MCA = getStreamer().getAssembler();
862   const MCObjectFileInfo &OFI = *MCA.getContext().getObjectFileInfo();
863 
864   // .bss, .text and .data are always at least 16-byte aligned.
865   MCSection &TextSection = *OFI.getTextSection();
866   MCA.registerSection(TextSection);
867   MCSection &DataSection = *OFI.getDataSection();
868   MCA.registerSection(DataSection);
869   MCSection &BSSSection = *OFI.getBSSSection();
870   MCA.registerSection(BSSSection);
871 
872   TextSection.setAlignment(std::max(16u, TextSection.getAlignment()));
873   DataSection.setAlignment(std::max(16u, DataSection.getAlignment()));
874   BSSSection.setAlignment(std::max(16u, BSSSection.getAlignment()));
875 
876   if (RoundSectionSizes) {
877     // Make sections sizes a multiple of the alignment. This is useful for
878     // verifying the output of IAS against the output of other assemblers but
879     // it's not necessary to produce a correct object and increases section
880     // size.
881     MCStreamer &OS = getStreamer();
882     for (MCSection &S : MCA) {
883       MCSectionELF &Section = static_cast<MCSectionELF &>(S);
884 
885       unsigned Alignment = Section.getAlignment();
886       if (Alignment) {
887         OS.SwitchSection(&Section);
888         if (Section.UseCodeAlign())
889           OS.EmitCodeAlignment(Alignment, Alignment);
890         else
891           OS.EmitValueToAlignment(Alignment, 0, 1, Alignment);
892       }
893     }
894   }
895 
896   const FeatureBitset &Features = STI.getFeatureBits();
897 
898   // Update e_header flags. See the FIXME and comment above in
899   // the constructor for a full rundown on this.
900   unsigned EFlags = MCA.getELFHeaderEFlags();
901 
902   // ABI
903   // N64 does not require any ABI bits.
904   if (getABI().IsO32())
905     EFlags |= ELF::EF_MIPS_ABI_O32;
906   else if (getABI().IsN32())
907     EFlags |= ELF::EF_MIPS_ABI2;
908 
909   if (Features[Mips::FeatureGP64Bit]) {
910     if (getABI().IsO32())
911       EFlags |= ELF::EF_MIPS_32BITMODE; /* Compatibility Mode */
912   } else if (Features[Mips::FeatureMips64r2] || Features[Mips::FeatureMips64])
913     EFlags |= ELF::EF_MIPS_32BITMODE;
914 
915   // -mplt is not implemented but we should act as if it was
916   // given.
917   if (!Features[Mips::FeatureNoABICalls])
918     EFlags |= ELF::EF_MIPS_CPIC;
919 
920   if (Pic)
921     EFlags |= ELF::EF_MIPS_PIC | ELF::EF_MIPS_CPIC;
922 
923   MCA.setELFHeaderEFlags(EFlags);
924 
925   // Emit all the option records.
926   // At the moment we are only emitting .Mips.options (ODK_REGINFO) and
927   // .reginfo.
928   MipsELFStreamer &MEF = static_cast<MipsELFStreamer &>(Streamer);
929   MEF.EmitMipsOptionRecords();
930 
931   emitMipsAbiFlags();
932 }
933 
934 void MipsTargetELFStreamer::emitAssignment(MCSymbol *S, const MCExpr *Value) {
935   auto *Symbol = cast<MCSymbolELF>(S);
936   // If on rhs is micromips symbol then mark Symbol as microMips.
937   if (Value->getKind() != MCExpr::SymbolRef)
938     return;
939   const auto &RhsSym = cast<MCSymbolELF>(
940       static_cast<const MCSymbolRefExpr *>(Value)->getSymbol());
941 
942   if (!(RhsSym.getOther() & ELF::STO_MIPS_MICROMIPS))
943     return;
944 
945   Symbol->setOther(ELF::STO_MIPS_MICROMIPS);
946 }
947 
948 MCELFStreamer &MipsTargetELFStreamer::getStreamer() {
949   return static_cast<MCELFStreamer &>(Streamer);
950 }
951 
952 void MipsTargetELFStreamer::emitDirectiveSetMicroMips() {
953   MicroMipsEnabled = true;
954   forbidModuleDirective();
955 }
956 
957 void MipsTargetELFStreamer::emitDirectiveSetNoMicroMips() {
958   MicroMipsEnabled = false;
959   forbidModuleDirective();
960 }
961 
962 void MipsTargetELFStreamer::setUsesMicroMips() {
963   MCAssembler &MCA = getStreamer().getAssembler();
964   unsigned Flags = MCA.getELFHeaderEFlags();
965   Flags |= ELF::EF_MIPS_MICROMIPS;
966   MCA.setELFHeaderEFlags(Flags);
967 }
968 
969 void MipsTargetELFStreamer::emitDirectiveSetMips16() {
970   MCAssembler &MCA = getStreamer().getAssembler();
971   unsigned Flags = MCA.getELFHeaderEFlags();
972   Flags |= ELF::EF_MIPS_ARCH_ASE_M16;
973   MCA.setELFHeaderEFlags(Flags);
974   forbidModuleDirective();
975 }
976 
977 void MipsTargetELFStreamer::emitDirectiveSetNoReorder() {
978   MCAssembler &MCA = getStreamer().getAssembler();
979   unsigned Flags = MCA.getELFHeaderEFlags();
980   Flags |= ELF::EF_MIPS_NOREORDER;
981   MCA.setELFHeaderEFlags(Flags);
982   forbidModuleDirective();
983 }
984 
985 void MipsTargetELFStreamer::emitDirectiveEnd(StringRef Name) {
986   MCAssembler &MCA = getStreamer().getAssembler();
987   MCContext &Context = MCA.getContext();
988   MCStreamer &OS = getStreamer();
989 
990   MCSectionELF *Sec = Context.getELFSection(".pdr", ELF::SHT_PROGBITS, 0);
991 
992   MCSymbol *Sym = Context.getOrCreateSymbol(Name);
993   const MCSymbolRefExpr *ExprRef =
994       MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, Context);
995 
996   MCA.registerSection(*Sec);
997   Sec->setAlignment(4);
998 
999   OS.PushSection();
1000 
1001   OS.SwitchSection(Sec);
1002 
1003   OS.EmitValueImpl(ExprRef, 4);
1004 
1005   OS.EmitIntValue(GPRInfoSet ? GPRBitMask : 0, 4); // reg_mask
1006   OS.EmitIntValue(GPRInfoSet ? GPROffset : 0, 4);  // reg_offset
1007 
1008   OS.EmitIntValue(FPRInfoSet ? FPRBitMask : 0, 4); // fpreg_mask
1009   OS.EmitIntValue(FPRInfoSet ? FPROffset : 0, 4);  // fpreg_offset
1010 
1011   OS.EmitIntValue(FrameInfoSet ? FrameOffset : 0, 4); // frame_offset
1012   OS.EmitIntValue(FrameInfoSet ? FrameReg : 0, 4);    // frame_reg
1013   OS.EmitIntValue(FrameInfoSet ? ReturnReg : 0, 4);   // return_reg
1014 
1015   // The .end directive marks the end of a procedure. Invalidate
1016   // the information gathered up until this point.
1017   GPRInfoSet = FPRInfoSet = FrameInfoSet = false;
1018 
1019   OS.PopSection();
1020 
1021   // .end also implicitly sets the size.
1022   MCSymbol *CurPCSym = Context.createTempSymbol();
1023   OS.EmitLabel(CurPCSym);
1024   const MCExpr *Size = MCBinaryExpr::createSub(
1025       MCSymbolRefExpr::create(CurPCSym, MCSymbolRefExpr::VK_None, Context),
1026       ExprRef, Context);
1027 
1028   // The ELFObjectWriter can determine the absolute size as it has access to
1029   // the layout information of the assembly file, so a size expression rather
1030   // than an absolute value is ok here.
1031   static_cast<MCSymbolELF *>(Sym)->setSize(Size);
1032 }
1033 
1034 void MipsTargetELFStreamer::emitDirectiveEnt(const MCSymbol &Symbol) {
1035   GPRInfoSet = FPRInfoSet = FrameInfoSet = false;
1036 
1037   // .ent also acts like an implicit '.type symbol, STT_FUNC'
1038   static_cast<const MCSymbolELF &>(Symbol).setType(ELF::STT_FUNC);
1039 }
1040 
1041 void MipsTargetELFStreamer::emitDirectiveAbiCalls() {
1042   MCAssembler &MCA = getStreamer().getAssembler();
1043   unsigned Flags = MCA.getELFHeaderEFlags();
1044   Flags |= ELF::EF_MIPS_CPIC | ELF::EF_MIPS_PIC;
1045   MCA.setELFHeaderEFlags(Flags);
1046 }
1047 
1048 void MipsTargetELFStreamer::emitDirectiveNaN2008() {
1049   MCAssembler &MCA = getStreamer().getAssembler();
1050   unsigned Flags = MCA.getELFHeaderEFlags();
1051   Flags |= ELF::EF_MIPS_NAN2008;
1052   MCA.setELFHeaderEFlags(Flags);
1053 }
1054 
1055 void MipsTargetELFStreamer::emitDirectiveNaNLegacy() {
1056   MCAssembler &MCA = getStreamer().getAssembler();
1057   unsigned Flags = MCA.getELFHeaderEFlags();
1058   Flags &= ~ELF::EF_MIPS_NAN2008;
1059   MCA.setELFHeaderEFlags(Flags);
1060 }
1061 
1062 void MipsTargetELFStreamer::emitDirectiveOptionPic0() {
1063   MCAssembler &MCA = getStreamer().getAssembler();
1064   unsigned Flags = MCA.getELFHeaderEFlags();
1065   // This option overrides other PIC options like -KPIC.
1066   Pic = false;
1067   Flags &= ~ELF::EF_MIPS_PIC;
1068   MCA.setELFHeaderEFlags(Flags);
1069 }
1070 
1071 void MipsTargetELFStreamer::emitDirectiveOptionPic2() {
1072   MCAssembler &MCA = getStreamer().getAssembler();
1073   unsigned Flags = MCA.getELFHeaderEFlags();
1074   Pic = true;
1075   // NOTE: We are following the GAS behaviour here which means the directive
1076   // 'pic2' also sets the CPIC bit in the ELF header. This is different from
1077   // what is stated in the SYSV ABI which consider the bits EF_MIPS_PIC and
1078   // EF_MIPS_CPIC to be mutually exclusive.
1079   Flags |= ELF::EF_MIPS_PIC | ELF::EF_MIPS_CPIC;
1080   MCA.setELFHeaderEFlags(Flags);
1081 }
1082 
1083 void MipsTargetELFStreamer::emitDirectiveInsn() {
1084   MipsTargetStreamer::emitDirectiveInsn();
1085   MipsELFStreamer &MEF = static_cast<MipsELFStreamer &>(Streamer);
1086   MEF.createPendingLabelRelocs();
1087 }
1088 
1089 void MipsTargetELFStreamer::emitFrame(unsigned StackReg, unsigned StackSize,
1090                                       unsigned ReturnReg_) {
1091   MCContext &Context = getStreamer().getAssembler().getContext();
1092   const MCRegisterInfo *RegInfo = Context.getRegisterInfo();
1093 
1094   FrameInfoSet = true;
1095   FrameReg = RegInfo->getEncodingValue(StackReg);
1096   FrameOffset = StackSize;
1097   ReturnReg = RegInfo->getEncodingValue(ReturnReg_);
1098 }
1099 
1100 void MipsTargetELFStreamer::emitMask(unsigned CPUBitmask,
1101                                      int CPUTopSavedRegOff) {
1102   GPRInfoSet = true;
1103   GPRBitMask = CPUBitmask;
1104   GPROffset = CPUTopSavedRegOff;
1105 }
1106 
1107 void MipsTargetELFStreamer::emitFMask(unsigned FPUBitmask,
1108                                       int FPUTopSavedRegOff) {
1109   FPRInfoSet = true;
1110   FPRBitMask = FPUBitmask;
1111   FPROffset = FPUTopSavedRegOff;
1112 }
1113 
1114 void MipsTargetELFStreamer::emitDirectiveCpLoad(unsigned RegNo) {
1115   // .cpload $reg
1116   // This directive expands to:
1117   // lui   $gp, %hi(_gp_disp)
1118   // addui $gp, $gp, %lo(_gp_disp)
1119   // addu  $gp, $gp, $reg
1120   // when support for position independent code is enabled.
1121   if (!Pic || (getABI().IsN32() || getABI().IsN64()))
1122     return;
1123 
1124   // There's a GNU extension controlled by -mno-shared that allows
1125   // locally-binding symbols to be accessed using absolute addresses.
1126   // This is currently not supported. When supported -mno-shared makes
1127   // .cpload expand to:
1128   //   lui     $gp, %hi(__gnu_local_gp)
1129   //   addiu   $gp, $gp, %lo(__gnu_local_gp)
1130 
1131   StringRef SymName("_gp_disp");
1132   MCAssembler &MCA = getStreamer().getAssembler();
1133   MCSymbol *GP_Disp = MCA.getContext().getOrCreateSymbol(SymName);
1134   MCA.registerSymbol(*GP_Disp);
1135 
1136   MCInst TmpInst;
1137   TmpInst.setOpcode(Mips::LUi);
1138   TmpInst.addOperand(MCOperand::createReg(Mips::GP));
1139   const MCExpr *HiSym = MipsMCExpr::create(
1140       MipsMCExpr::MEK_HI,
1141       MCSymbolRefExpr::create("_gp_disp", MCSymbolRefExpr::VK_None,
1142                               MCA.getContext()),
1143       MCA.getContext());
1144   TmpInst.addOperand(MCOperand::createExpr(HiSym));
1145   getStreamer().EmitInstruction(TmpInst, STI);
1146 
1147   TmpInst.clear();
1148 
1149   TmpInst.setOpcode(Mips::ADDiu);
1150   TmpInst.addOperand(MCOperand::createReg(Mips::GP));
1151   TmpInst.addOperand(MCOperand::createReg(Mips::GP));
1152   const MCExpr *LoSym = MipsMCExpr::create(
1153       MipsMCExpr::MEK_LO,
1154       MCSymbolRefExpr::create("_gp_disp", MCSymbolRefExpr::VK_None,
1155                               MCA.getContext()),
1156       MCA.getContext());
1157   TmpInst.addOperand(MCOperand::createExpr(LoSym));
1158   getStreamer().EmitInstruction(TmpInst, STI);
1159 
1160   TmpInst.clear();
1161 
1162   TmpInst.setOpcode(Mips::ADDu);
1163   TmpInst.addOperand(MCOperand::createReg(Mips::GP));
1164   TmpInst.addOperand(MCOperand::createReg(Mips::GP));
1165   TmpInst.addOperand(MCOperand::createReg(RegNo));
1166   getStreamer().EmitInstruction(TmpInst, STI);
1167 
1168   forbidModuleDirective();
1169 }
1170 
1171 bool MipsTargetELFStreamer::emitDirectiveCpRestore(
1172     int Offset, function_ref<unsigned()> GetATReg, SMLoc IDLoc,
1173     const MCSubtargetInfo *STI) {
1174   MipsTargetStreamer::emitDirectiveCpRestore(Offset, GetATReg, IDLoc, STI);
1175   // .cprestore offset
1176   // When PIC mode is enabled and the O32 ABI is used, this directive expands
1177   // to:
1178   //    sw $gp, offset($sp)
1179   // and adds a corresponding LW after every JAL.
1180 
1181   // Note that .cprestore is ignored if used with the N32 and N64 ABIs or if it
1182   // is used in non-PIC mode.
1183   if (!Pic || (getABI().IsN32() || getABI().IsN64()))
1184     return true;
1185 
1186   // Store the $gp on the stack.
1187   emitStoreWithImmOffset(Mips::SW, Mips::GP, Mips::SP, Offset, GetATReg, IDLoc,
1188                          STI);
1189   return true;
1190 }
1191 
1192 void MipsTargetELFStreamer::emitDirectiveCpsetup(unsigned RegNo,
1193                                                  int RegOrOffset,
1194                                                  const MCSymbol &Sym,
1195                                                  bool IsReg) {
1196   // Only N32 and N64 emit anything for .cpsetup iff PIC is set.
1197   if (!Pic || !(getABI().IsN32() || getABI().IsN64()))
1198     return;
1199 
1200   forbidModuleDirective();
1201 
1202   MCAssembler &MCA = getStreamer().getAssembler();
1203   MCInst Inst;
1204 
1205   // Either store the old $gp in a register or on the stack
1206   if (IsReg) {
1207     // move $save, $gpreg
1208     emitRRR(Mips::OR64, RegOrOffset, Mips::GP, Mips::ZERO, SMLoc(), &STI);
1209   } else {
1210     // sd $gpreg, offset($sp)
1211     emitRRI(Mips::SD, Mips::GP, Mips::SP, RegOrOffset, SMLoc(), &STI);
1212   }
1213 
1214   if (getABI().IsN32()) {
1215     MCSymbol *GPSym = MCA.getContext().getOrCreateSymbol("__gnu_local_gp");
1216     const MipsMCExpr *HiExpr = MipsMCExpr::create(
1217         MipsMCExpr::MEK_HI, MCSymbolRefExpr::create(GPSym, MCA.getContext()),
1218         MCA.getContext());
1219     const MipsMCExpr *LoExpr = MipsMCExpr::create(
1220         MipsMCExpr::MEK_LO, MCSymbolRefExpr::create(GPSym, MCA.getContext()),
1221         MCA.getContext());
1222 
1223     // lui $gp, %hi(__gnu_local_gp)
1224     emitRX(Mips::LUi, Mips::GP, MCOperand::createExpr(HiExpr), SMLoc(), &STI);
1225 
1226     // addiu  $gp, $gp, %lo(__gnu_local_gp)
1227     emitRRX(Mips::ADDiu, Mips::GP, Mips::GP, MCOperand::createExpr(LoExpr),
1228             SMLoc(), &STI);
1229 
1230     return;
1231   }
1232 
1233   const MipsMCExpr *HiExpr = MipsMCExpr::createGpOff(
1234       MipsMCExpr::MEK_HI, MCSymbolRefExpr::create(&Sym, MCA.getContext()),
1235       MCA.getContext());
1236   const MipsMCExpr *LoExpr = MipsMCExpr::createGpOff(
1237       MipsMCExpr::MEK_LO, MCSymbolRefExpr::create(&Sym, MCA.getContext()),
1238       MCA.getContext());
1239 
1240   // lui $gp, %hi(%neg(%gp_rel(funcSym)))
1241   emitRX(Mips::LUi, Mips::GP, MCOperand::createExpr(HiExpr), SMLoc(), &STI);
1242 
1243   // addiu  $gp, $gp, %lo(%neg(%gp_rel(funcSym)))
1244   emitRRX(Mips::ADDiu, Mips::GP, Mips::GP, MCOperand::createExpr(LoExpr),
1245           SMLoc(), &STI);
1246 
1247   // daddu  $gp, $gp, $funcreg
1248   emitRRR(Mips::DADDu, Mips::GP, Mips::GP, RegNo, SMLoc(), &STI);
1249 }
1250 
1251 void MipsTargetELFStreamer::emitDirectiveCpreturn(unsigned SaveLocation,
1252                                                   bool SaveLocationIsRegister) {
1253   // Only N32 and N64 emit anything for .cpreturn iff PIC is set.
1254   if (!Pic || !(getABI().IsN32() || getABI().IsN64()))
1255     return;
1256 
1257   MCInst Inst;
1258   // Either restore the old $gp from a register or on the stack
1259   if (SaveLocationIsRegister) {
1260     Inst.setOpcode(Mips::OR);
1261     Inst.addOperand(MCOperand::createReg(Mips::GP));
1262     Inst.addOperand(MCOperand::createReg(SaveLocation));
1263     Inst.addOperand(MCOperand::createReg(Mips::ZERO));
1264   } else {
1265     Inst.setOpcode(Mips::LD);
1266     Inst.addOperand(MCOperand::createReg(Mips::GP));
1267     Inst.addOperand(MCOperand::createReg(Mips::SP));
1268     Inst.addOperand(MCOperand::createImm(SaveLocation));
1269   }
1270   getStreamer().EmitInstruction(Inst, STI);
1271 
1272   forbidModuleDirective();
1273 }
1274 
1275 void MipsTargetELFStreamer::emitMipsAbiFlags() {
1276   MCAssembler &MCA = getStreamer().getAssembler();
1277   MCContext &Context = MCA.getContext();
1278   MCStreamer &OS = getStreamer();
1279   MCSectionELF *Sec = Context.getELFSection(
1280       ".MIPS.abiflags", ELF::SHT_MIPS_ABIFLAGS, ELF::SHF_ALLOC, 24, "");
1281   MCA.registerSection(*Sec);
1282   Sec->setAlignment(8);
1283   OS.SwitchSection(Sec);
1284 
1285   OS << ABIFlagsSection;
1286 }
1287