1 //===-- MipsELFObjectWriter.cpp - Mips ELF Writer -------------------------===//
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 #include "MCTargetDesc/MipsFixupKinds.h"
11 #include "MCTargetDesc/MipsMCTargetDesc.h"
12 #include "llvm/ADT/STLExtras.h"
13 #include "llvm/BinaryFormat/ELF.h"
14 #include "llvm/MC/MCELFObjectWriter.h"
15 #include "llvm/MC/MCFixup.h"
16 #include "llvm/MC/MCObjectWriter.h"
17 #include "llvm/MC/MCSymbolELF.h"
18 #include "llvm/Support/Casting.h"
19 #include "llvm/Support/Compiler.h"
20 #include "llvm/Support/Debug.h"
21 #include "llvm/Support/ErrorHandling.h"
22 #include "llvm/Support/MathExtras.h"
23 #include "llvm/Support/raw_ostream.h"
31 #define DEBUG_TYPE "mips-elf-object-writer"
37 /// Holds additional information needed by the relocation ordering algorithm.
38 struct MipsRelocationEntry {
39 const ELFRelocationEntry R; ///< The relocation.
40 bool Matched = false; ///< Is this relocation part of a match.
42 MipsRelocationEntry(const ELFRelocationEntry &R) : R(R) {}
44 void print(raw_ostream &Out) const {
46 Out << ", Matched=" << Matched;
51 raw_ostream &operator<<(raw_ostream &OS, const MipsRelocationEntry &RHS) {
57 class MipsELFObjectWriter : public MCELFObjectTargetWriter {
59 MipsELFObjectWriter(uint8_t OSABI, bool HasRelocationAddend, bool Is64,
62 ~MipsELFObjectWriter() override = default;
64 unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
65 const MCFixup &Fixup, bool IsPCRel) const override;
66 bool needsRelocateWithSymbol(const MCSymbol &Sym,
67 unsigned Type) const override;
68 void sortRelocs(const MCAssembler &Asm,
69 std::vector<ELFRelocationEntry> &Relocs) override;
72 /// The possible results of the Predicate function used by find_best.
73 enum FindBestPredicateResult {
74 FindBest_NoMatch = 0, ///< The current element is not a match.
75 FindBest_Match, ///< The current element is a match but better ones are
77 FindBest_PerfectMatch, ///< The current element is an unbeatable match.
80 } // end anonymous namespace
82 /// Copy elements in the range [First, Last) to d1 when the predicate is true or
83 /// d2 when the predicate is false. This is essentially both std::copy_if and
84 /// std::remove_copy_if combined into a single pass.
85 template <class InputIt, class OutputIt1, class OutputIt2, class UnaryPredicate>
86 static std::pair<OutputIt1, OutputIt2> copy_if_else(InputIt First, InputIt Last,
87 OutputIt1 d1, OutputIt2 d2,
88 UnaryPredicate Predicate) {
89 for (InputIt I = First; I != Last; ++I) {
99 return std::make_pair(d1, d2);
102 /// Find the best match in the range [First, Last).
104 /// An element matches when Predicate(X) returns FindBest_Match or
105 /// FindBest_PerfectMatch. A value of FindBest_PerfectMatch also terminates
106 /// the search. BetterThan(A, B) is a comparator that returns true when A is a
107 /// better match than B. The return value is the position of the best match.
109 /// This is similar to std::find_if but finds the best of multiple possible
111 template <class InputIt, class UnaryPredicate, class Comparator>
112 static InputIt find_best(InputIt First, InputIt Last, UnaryPredicate Predicate,
113 Comparator BetterThan) {
116 for (InputIt I = First; I != Last; ++I) {
117 unsigned Matched = Predicate(*I);
118 if (Matched != FindBest_NoMatch) {
119 DEBUG(dbgs() << std::distance(First, I) << " is a match (";
120 I->print(dbgs()); dbgs() << ")\n");
121 if (Best == Last || BetterThan(*I, *Best)) {
122 DEBUG(dbgs() << ".. and it beats the last one\n");
126 if (Matched == FindBest_PerfectMatch) {
127 DEBUG(dbgs() << ".. and it is unbeatable\n");
135 /// Determine the low relocation that matches the given relocation.
136 /// If the relocation does not need a low relocation then the return value
137 /// is ELF::R_MIPS_NONE.
139 /// The relocations that need a matching low part are
140 /// R_(MIPS|MICROMIPS|MIPS16)_HI16 for all symbols and
141 /// R_(MIPS|MICROMIPS|MIPS16)_GOT16 for local symbols only.
142 static unsigned getMatchingLoType(const ELFRelocationEntry &Reloc) {
143 unsigned Type = Reloc.Type;
144 if (Type == ELF::R_MIPS_HI16)
145 return ELF::R_MIPS_LO16;
146 if (Type == ELF::R_MICROMIPS_HI16)
147 return ELF::R_MICROMIPS_LO16;
148 if (Type == ELF::R_MIPS16_HI16)
149 return ELF::R_MIPS16_LO16;
151 if (Reloc.OriginalSymbol->getBinding() != ELF::STB_LOCAL)
152 return ELF::R_MIPS_NONE;
154 if (Type == ELF::R_MIPS_GOT16)
155 return ELF::R_MIPS_LO16;
156 if (Type == ELF::R_MICROMIPS_GOT16)
157 return ELF::R_MICROMIPS_LO16;
158 if (Type == ELF::R_MIPS16_GOT16)
159 return ELF::R_MIPS16_LO16;
161 return ELF::R_MIPS_NONE;
164 /// Determine whether a relocation (X) matches the one given in R.
166 /// A relocation matches if:
167 /// - It's type matches that of a corresponding low part. This is provided in
168 /// MatchingType for efficiency.
169 /// - It's based on the same symbol.
170 /// - It's offset of greater or equal to that of the one given in R.
171 /// It should be noted that this rule assumes the programmer does not use
172 /// offsets that exceed the alignment of the symbol. The carry-bit will be
173 /// incorrect if this is not true.
175 /// A matching relocation is unbeatable if:
176 /// - It is not already involved in a match.
177 /// - It's offset is exactly that of the one given in R.
178 static FindBestPredicateResult isMatchingReloc(const MipsRelocationEntry &X,
179 const ELFRelocationEntry &R,
180 unsigned MatchingType) {
181 if (X.R.Type == MatchingType && X.R.OriginalSymbol == R.OriginalSymbol) {
183 X.R.OriginalAddend == R.OriginalAddend)
184 return FindBest_PerfectMatch;
185 else if (X.R.OriginalAddend >= R.OriginalAddend)
186 return FindBest_Match;
188 return FindBest_NoMatch;
191 /// Determine whether Candidate or PreviousBest is the better match.
192 /// The return value is true if Candidate is the better match.
194 /// A matching relocation is a better match if:
195 /// - It has a smaller addend.
196 /// - It is not already involved in a match.
197 static bool compareMatchingRelocs(const MipsRelocationEntry &Candidate,
198 const MipsRelocationEntry &PreviousBest) {
199 if (Candidate.R.OriginalAddend != PreviousBest.R.OriginalAddend)
200 return Candidate.R.OriginalAddend < PreviousBest.R.OriginalAddend;
201 return PreviousBest.Matched && !Candidate.Matched;
205 /// Print all the relocations.
206 template <class Container>
207 static void dumpRelocs(const char *Prefix, const Container &Relocs) {
208 for (const auto &R : Relocs)
209 dbgs() << Prefix << R << "\n";
213 MipsELFObjectWriter::MipsELFObjectWriter(uint8_t OSABI,
214 bool HasRelocationAddend, bool Is64,
216 : MCELFObjectTargetWriter(Is64, OSABI, ELF::EM_MIPS, HasRelocationAddend) {}
218 unsigned MipsELFObjectWriter::getRelocType(MCContext &Ctx,
219 const MCValue &Target,
220 const MCFixup &Fixup,
221 bool IsPCRel) const {
222 // Determine the type of the relocation.
223 unsigned Kind = (unsigned)Fixup.getKind();
226 case Mips::fixup_Mips_NONE:
227 return ELF::R_MIPS_NONE;
229 report_fatal_error("MIPS does not support one byte relocations");
230 case Mips::fixup_Mips_16:
232 return IsPCRel ? ELF::R_MIPS_PC16 : ELF::R_MIPS_16;
233 case Mips::fixup_Mips_32:
235 return IsPCRel ? ELF::R_MIPS_PC32 : ELF::R_MIPS_32;
240 case Mips::fixup_Mips_Branch_PCRel:
241 case Mips::fixup_Mips_PC16:
242 return ELF::R_MIPS_PC16;
243 case Mips::fixup_MICROMIPS_PC7_S1:
244 return ELF::R_MICROMIPS_PC7_S1;
245 case Mips::fixup_MICROMIPS_PC10_S1:
246 return ELF::R_MICROMIPS_PC10_S1;
247 case Mips::fixup_MICROMIPS_PC16_S1:
248 return ELF::R_MICROMIPS_PC16_S1;
249 case Mips::fixup_MICROMIPS_PC26_S1:
250 return ELF::R_MICROMIPS_PC26_S1;
251 case Mips::fixup_MICROMIPS_PC19_S2:
252 return ELF::R_MICROMIPS_PC19_S2;
253 case Mips::fixup_MICROMIPS_PC18_S3:
254 return ELF::R_MICROMIPS_PC18_S3;
255 case Mips::fixup_MICROMIPS_PC21_S1:
256 return ELF::R_MICROMIPS_PC21_S1;
257 case Mips::fixup_MIPS_PC19_S2:
258 return ELF::R_MIPS_PC19_S2;
259 case Mips::fixup_MIPS_PC18_S3:
260 return ELF::R_MIPS_PC18_S3;
261 case Mips::fixup_MIPS_PC21_S2:
262 return ELF::R_MIPS_PC21_S2;
263 case Mips::fixup_MIPS_PC26_S2:
264 return ELF::R_MIPS_PC26_S2;
265 case Mips::fixup_MIPS_PCHI16:
266 return ELF::R_MIPS_PCHI16;
267 case Mips::fixup_MIPS_PCLO16:
268 return ELF::R_MIPS_PCLO16;
271 llvm_unreachable("invalid PC-relative fixup kind!");
275 case Mips::fixup_Mips_64:
277 return ELF::R_MIPS_64;
279 return ELF::R_MIPS_TLS_DTPREL32;
281 return ELF::R_MIPS_TLS_DTPREL64;
283 return ELF::R_MIPS_TLS_TPREL32;
285 return ELF::R_MIPS_TLS_TPREL64;
288 unsigned Type = (unsigned)ELF::R_MIPS_NONE;
289 Type = setRType((unsigned)ELF::R_MIPS_GPREL32, Type);
290 Type = setRType2((unsigned)ELF::R_MIPS_64, Type);
291 Type = setRType3((unsigned)ELF::R_MIPS_NONE, Type);
294 return ELF::R_MIPS_GPREL32;
295 case Mips::fixup_Mips_GPREL16:
296 return ELF::R_MIPS_GPREL16;
297 case Mips::fixup_Mips_26:
298 return ELF::R_MIPS_26;
299 case Mips::fixup_Mips_CALL16:
300 return ELF::R_MIPS_CALL16;
301 case Mips::fixup_Mips_GOT:
302 return ELF::R_MIPS_GOT16;
303 case Mips::fixup_Mips_HI16:
304 return ELF::R_MIPS_HI16;
305 case Mips::fixup_Mips_LO16:
306 return ELF::R_MIPS_LO16;
307 case Mips::fixup_Mips_TLSGD:
308 return ELF::R_MIPS_TLS_GD;
309 case Mips::fixup_Mips_GOTTPREL:
310 return ELF::R_MIPS_TLS_GOTTPREL;
311 case Mips::fixup_Mips_TPREL_HI:
312 return ELF::R_MIPS_TLS_TPREL_HI16;
313 case Mips::fixup_Mips_TPREL_LO:
314 return ELF::R_MIPS_TLS_TPREL_LO16;
315 case Mips::fixup_Mips_TLSLDM:
316 return ELF::R_MIPS_TLS_LDM;
317 case Mips::fixup_Mips_DTPREL_HI:
318 return ELF::R_MIPS_TLS_DTPREL_HI16;
319 case Mips::fixup_Mips_DTPREL_LO:
320 return ELF::R_MIPS_TLS_DTPREL_LO16;
321 case Mips::fixup_Mips_GOT_PAGE:
322 return ELF::R_MIPS_GOT_PAGE;
323 case Mips::fixup_Mips_GOT_OFST:
324 return ELF::R_MIPS_GOT_OFST;
325 case Mips::fixup_Mips_GOT_DISP:
326 return ELF::R_MIPS_GOT_DISP;
327 case Mips::fixup_Mips_GPOFF_HI: {
328 unsigned Type = (unsigned)ELF::R_MIPS_NONE;
329 Type = setRType((unsigned)ELF::R_MIPS_GPREL16, Type);
330 Type = setRType2((unsigned)ELF::R_MIPS_SUB, Type);
331 Type = setRType3((unsigned)ELF::R_MIPS_HI16, Type);
334 case Mips::fixup_Mips_GPOFF_LO: {
335 unsigned Type = (unsigned)ELF::R_MIPS_NONE;
336 Type = setRType((unsigned)ELF::R_MIPS_GPREL16, Type);
337 Type = setRType2((unsigned)ELF::R_MIPS_SUB, Type);
338 Type = setRType3((unsigned)ELF::R_MIPS_LO16, Type);
341 case Mips::fixup_Mips_HIGHER:
342 return ELF::R_MIPS_HIGHER;
343 case Mips::fixup_Mips_HIGHEST:
344 return ELF::R_MIPS_HIGHEST;
345 case Mips::fixup_Mips_SUB:
346 return ELF::R_MIPS_SUB;
347 case Mips::fixup_Mips_GOT_HI16:
348 return ELF::R_MIPS_GOT_HI16;
349 case Mips::fixup_Mips_GOT_LO16:
350 return ELF::R_MIPS_GOT_LO16;
351 case Mips::fixup_Mips_CALL_HI16:
352 return ELF::R_MIPS_CALL_HI16;
353 case Mips::fixup_Mips_CALL_LO16:
354 return ELF::R_MIPS_CALL_LO16;
355 case Mips::fixup_MICROMIPS_26_S1:
356 return ELF::R_MICROMIPS_26_S1;
357 case Mips::fixup_MICROMIPS_HI16:
358 return ELF::R_MICROMIPS_HI16;
359 case Mips::fixup_MICROMIPS_LO16:
360 return ELF::R_MICROMIPS_LO16;
361 case Mips::fixup_MICROMIPS_GOT16:
362 return ELF::R_MICROMIPS_GOT16;
363 case Mips::fixup_MICROMIPS_CALL16:
364 return ELF::R_MICROMIPS_CALL16;
365 case Mips::fixup_MICROMIPS_GOT_DISP:
366 return ELF::R_MICROMIPS_GOT_DISP;
367 case Mips::fixup_MICROMIPS_GOT_PAGE:
368 return ELF::R_MICROMIPS_GOT_PAGE;
369 case Mips::fixup_MICROMIPS_GOT_OFST:
370 return ELF::R_MICROMIPS_GOT_OFST;
371 case Mips::fixup_MICROMIPS_TLS_GD:
372 return ELF::R_MICROMIPS_TLS_GD;
373 case Mips::fixup_MICROMIPS_TLS_LDM:
374 return ELF::R_MICROMIPS_TLS_LDM;
375 case Mips::fixup_MICROMIPS_TLS_DTPREL_HI16:
376 return ELF::R_MICROMIPS_TLS_DTPREL_HI16;
377 case Mips::fixup_MICROMIPS_TLS_DTPREL_LO16:
378 return ELF::R_MICROMIPS_TLS_DTPREL_LO16;
379 case Mips::fixup_MICROMIPS_GOTTPREL:
380 return ELF::R_MICROMIPS_TLS_GOTTPREL;
381 case Mips::fixup_MICROMIPS_TLS_TPREL_HI16:
382 return ELF::R_MICROMIPS_TLS_TPREL_HI16;
383 case Mips::fixup_MICROMIPS_TLS_TPREL_LO16:
384 return ELF::R_MICROMIPS_TLS_TPREL_LO16;
385 case Mips::fixup_MICROMIPS_SUB:
386 return ELF::R_MICROMIPS_SUB;
389 llvm_unreachable("invalid fixup kind!");
392 /// Sort relocation table entries by offset except where another order is
393 /// required by the MIPS ABI.
395 /// MIPS has a few relocations that have an AHL component in the expression used
396 /// to evaluate them. This AHL component is an addend with the same number of
397 /// bits as a symbol value but not all of our ABI's are able to supply a
398 /// sufficiently sized addend in a single relocation.
400 /// The O32 ABI for example, uses REL relocations which store the addend in the
401 /// section data. All the relocations with AHL components affect 16-bit fields
402 /// so the addend for a single relocation is limited to 16-bit. This ABI
403 /// resolves the limitation by linking relocations (e.g. R_MIPS_HI16 and
404 /// R_MIPS_LO16) and distributing the addend between the linked relocations. The
405 /// ABI mandates that such relocations must be next to each other in a
406 /// particular order (e.g. R_MIPS_HI16 must be immediately followed by a
407 /// matching R_MIPS_LO16) but the rule is less strict in practice.
409 /// The de facto standard is lenient in the following ways:
410 /// - 'Immediately following' does not refer to the next relocation entry but
411 /// the next matching relocation.
412 /// - There may be multiple high parts relocations for one low part relocation.
413 /// - There may be multiple low part relocations for one high part relocation.
414 /// - The AHL addend in each part does not have to be exactly equal as long as
415 /// the difference does not affect the carry bit from bit 15 into 16. This is
416 /// to allow, for example, the use of %lo(foo) and %lo(foo+4) when loading
417 /// both halves of a long long.
419 /// See getMatchingLoType() for a description of which high part relocations
420 /// match which low part relocations. One particular thing to note is that
421 /// R_MIPS_GOT16 and similar only have AHL addends if they refer to local
424 /// It should also be noted that this function is not affected by whether
425 /// the symbol was kept or rewritten into a section-relative equivalent. We
426 /// always match using the expressions from the source.
427 void MipsELFObjectWriter::sortRelocs(const MCAssembler &Asm,
428 std::vector<ELFRelocationEntry> &Relocs) {
429 // We do not need to sort the relocation table for RELA relocations which
430 // N32/N64 uses as the relocation addend contains the value we require,
431 // rather than it being split across a pair of relocations.
432 if (hasRelocationAddend())
435 if (Relocs.size() < 2)
438 // Sort relocations by the address they are applied to.
439 std::sort(Relocs.begin(), Relocs.end(),
440 [](const ELFRelocationEntry &A, const ELFRelocationEntry &B) {
441 return A.Offset < B.Offset;
444 std::list<MipsRelocationEntry> Sorted;
445 std::list<ELFRelocationEntry> Remainder;
447 DEBUG(dumpRelocs("R: ", Relocs));
449 // Separate the movable relocations (AHL relocations using the high bits) from
450 // the immobile relocations (everything else). This does not preserve high/low
451 // matches that already existed in the input.
452 copy_if_else(Relocs.begin(), Relocs.end(), std::back_inserter(Remainder),
453 std::back_inserter(Sorted), [](const ELFRelocationEntry &Reloc) {
454 return getMatchingLoType(Reloc) != ELF::R_MIPS_NONE;
457 for (auto &R : Remainder) {
458 DEBUG(dbgs() << "Matching: " << R << "\n");
460 unsigned MatchingType = getMatchingLoType(R);
461 assert(MatchingType != ELF::R_MIPS_NONE &&
462 "Wrong list for reloc that doesn't need a match");
464 // Find the best matching relocation for the current high part.
465 // See isMatchingReloc for a description of a matching relocation and
466 // compareMatchingRelocs for a description of what 'best' means.
467 auto InsertionPoint =
468 find_best(Sorted.begin(), Sorted.end(),
469 [&R, &MatchingType](const MipsRelocationEntry &X) {
470 return isMatchingReloc(X, R, MatchingType);
472 compareMatchingRelocs);
474 // If we matched then insert the high part in front of the match and mark
475 // both relocations as being involved in a match. We only mark the high
476 // part for cosmetic reasons in the debug output.
478 // If we failed to find a match then the high part is orphaned. This is not
479 // permitted since the relocation cannot be evaluated without knowing the
480 // carry-in. We can sometimes handle this using a matching low part that is
481 // already used in a match but we already cover that case in
482 // isMatchingReloc and compareMatchingRelocs. For the remaining cases we
483 // should insert the high part at the end of the list. This will cause the
484 // linker to fail but the alternative is to cause the linker to bind the
485 // high part to a semi-matching low part and silently calculate the wrong
486 // value. Unfortunately we have no means to warn the user that we did this
487 // so leave it up to the linker to complain about it.
488 if (InsertionPoint != Sorted.end())
489 InsertionPoint->Matched = true;
490 Sorted.insert(InsertionPoint, R)->Matched = true;
493 DEBUG(dumpRelocs("S: ", Sorted));
495 assert(Relocs.size() == Sorted.size() && "Some relocs were not consumed");
497 // Overwrite the original vector with the sorted elements. The caller expects
498 // them in reverse order.
500 for (const auto &R : reverse(Sorted))
501 Relocs[CopyTo++] = R.R;
504 bool MipsELFObjectWriter::needsRelocateWithSymbol(const MCSymbol &Sym,
505 unsigned Type) const {
506 // If it's a compound relocation for N64 then we need the relocation if any
507 // sub-relocation needs it.
508 if (!isUInt<8>(Type))
509 return needsRelocateWithSymbol(Sym, Type & 0xff) ||
510 needsRelocateWithSymbol(Sym, (Type >> 8) & 0xff) ||
511 needsRelocateWithSymbol(Sym, (Type >> 16) & 0xff);
515 errs() << Type << "\n";
516 llvm_unreachable("Unexpected relocation");
519 // This relocation doesn't affect the section data.
520 case ELF::R_MIPS_NONE:
523 // On REL ABI's (e.g. O32), these relocations form pairs. The pairing is done
524 // by the static linker by matching the symbol and offset.
525 // We only see one relocation at a time but it's still safe to relocate with
526 // the section so long as both relocations make the same decision.
528 // Some older linkers may require the symbol for particular cases. Such cases
529 // are not supported yet but can be added as required.
530 case ELF::R_MIPS_GOT16:
531 case ELF::R_MIPS16_GOT16:
532 case ELF::R_MICROMIPS_GOT16:
533 case ELF::R_MIPS_HIGHER:
534 case ELF::R_MIPS_HIGHEST:
535 case ELF::R_MIPS_HI16:
536 case ELF::R_MIPS16_HI16:
537 case ELF::R_MICROMIPS_HI16:
538 case ELF::R_MIPS_LO16:
539 case ELF::R_MIPS16_LO16:
540 case ELF::R_MICROMIPS_LO16:
541 // FIXME: It should be safe to return false for the STO_MIPS_MICROMIPS but
542 // we neglect to handle the adjustment to the LSB of the addend that
543 // it causes in applyFixup() and similar.
544 if (cast<MCSymbolELF>(Sym).getOther() & ELF::STO_MIPS_MICROMIPS)
548 case ELF::R_MIPS_GOT_PAGE:
549 case ELF::R_MICROMIPS_GOT_PAGE:
550 case ELF::R_MIPS_GOT_OFST:
551 case ELF::R_MICROMIPS_GOT_OFST:
554 case ELF::R_MIPS_GPREL32:
555 if (cast<MCSymbolELF>(Sym).getOther() & ELF::STO_MIPS_MICROMIPS)
560 case ELF::R_MIPS_GPREL16:
561 case ELF::R_MIPS_PC16:
562 case ELF::R_MIPS_SUB:
565 // FIXME: Many of these relocations should probably return false but this
566 // hasn't been confirmed to be safe yet.
567 case ELF::R_MIPS_REL32:
568 case ELF::R_MIPS_LITERAL:
569 case ELF::R_MIPS_CALL16:
570 case ELF::R_MIPS_SHIFT5:
571 case ELF::R_MIPS_SHIFT6:
572 case ELF::R_MIPS_GOT_DISP:
573 case ELF::R_MIPS_GOT_HI16:
574 case ELF::R_MIPS_GOT_LO16:
575 case ELF::R_MIPS_INSERT_A:
576 case ELF::R_MIPS_INSERT_B:
577 case ELF::R_MIPS_DELETE:
578 case ELF::R_MIPS_CALL_HI16:
579 case ELF::R_MIPS_CALL_LO16:
580 case ELF::R_MIPS_SCN_DISP:
581 case ELF::R_MIPS_REL16:
582 case ELF::R_MIPS_ADD_IMMEDIATE:
583 case ELF::R_MIPS_PJUMP:
584 case ELF::R_MIPS_RELGOT:
585 case ELF::R_MIPS_JALR:
586 case ELF::R_MIPS_TLS_DTPMOD32:
587 case ELF::R_MIPS_TLS_DTPREL32:
588 case ELF::R_MIPS_TLS_DTPMOD64:
589 case ELF::R_MIPS_TLS_DTPREL64:
590 case ELF::R_MIPS_TLS_GD:
591 case ELF::R_MIPS_TLS_LDM:
592 case ELF::R_MIPS_TLS_DTPREL_HI16:
593 case ELF::R_MIPS_TLS_DTPREL_LO16:
594 case ELF::R_MIPS_TLS_GOTTPREL:
595 case ELF::R_MIPS_TLS_TPREL32:
596 case ELF::R_MIPS_TLS_TPREL64:
597 case ELF::R_MIPS_TLS_TPREL_HI16:
598 case ELF::R_MIPS_TLS_TPREL_LO16:
599 case ELF::R_MIPS_GLOB_DAT:
600 case ELF::R_MIPS_PC21_S2:
601 case ELF::R_MIPS_PC26_S2:
602 case ELF::R_MIPS_PC18_S3:
603 case ELF::R_MIPS_PC19_S2:
604 case ELF::R_MIPS_PCHI16:
605 case ELF::R_MIPS_PCLO16:
606 case ELF::R_MIPS_COPY:
607 case ELF::R_MIPS_JUMP_SLOT:
608 case ELF::R_MIPS_NUM:
609 case ELF::R_MIPS_PC32:
611 case ELF::R_MICROMIPS_26_S1:
612 case ELF::R_MICROMIPS_GPREL16:
613 case ELF::R_MICROMIPS_LITERAL:
614 case ELF::R_MICROMIPS_PC7_S1:
615 case ELF::R_MICROMIPS_PC10_S1:
616 case ELF::R_MICROMIPS_PC16_S1:
617 case ELF::R_MICROMIPS_CALL16:
618 case ELF::R_MICROMIPS_GOT_DISP:
619 case ELF::R_MICROMIPS_GOT_HI16:
620 case ELF::R_MICROMIPS_GOT_LO16:
621 case ELF::R_MICROMIPS_SUB:
622 case ELF::R_MICROMIPS_HIGHER:
623 case ELF::R_MICROMIPS_HIGHEST:
624 case ELF::R_MICROMIPS_CALL_HI16:
625 case ELF::R_MICROMIPS_CALL_LO16:
626 case ELF::R_MICROMIPS_SCN_DISP:
627 case ELF::R_MICROMIPS_JALR:
628 case ELF::R_MICROMIPS_HI0_LO16:
629 case ELF::R_MICROMIPS_TLS_GD:
630 case ELF::R_MICROMIPS_TLS_LDM:
631 case ELF::R_MICROMIPS_TLS_DTPREL_HI16:
632 case ELF::R_MICROMIPS_TLS_DTPREL_LO16:
633 case ELF::R_MICROMIPS_TLS_GOTTPREL:
634 case ELF::R_MICROMIPS_TLS_TPREL_HI16:
635 case ELF::R_MICROMIPS_TLS_TPREL_LO16:
636 case ELF::R_MICROMIPS_GPREL7_S2:
637 case ELF::R_MICROMIPS_PC23_S2:
638 case ELF::R_MICROMIPS_PC21_S1:
639 case ELF::R_MICROMIPS_PC26_S1:
640 case ELF::R_MICROMIPS_PC18_S3:
641 case ELF::R_MICROMIPS_PC19_S2:
644 // FIXME: Many of these should probably return false but MIPS16 isn't
645 // supported by the integrated assembler.
646 case ELF::R_MIPS16_26:
647 case ELF::R_MIPS16_GPREL:
648 case ELF::R_MIPS16_CALL16:
649 case ELF::R_MIPS16_TLS_GD:
650 case ELF::R_MIPS16_TLS_LDM:
651 case ELF::R_MIPS16_TLS_DTPREL_HI16:
652 case ELF::R_MIPS16_TLS_DTPREL_LO16:
653 case ELF::R_MIPS16_TLS_GOTTPREL:
654 case ELF::R_MIPS16_TLS_TPREL_HI16:
655 case ELF::R_MIPS16_TLS_TPREL_LO16:
656 llvm_unreachable("Unsupported MIPS16 relocation");
661 std::unique_ptr<MCObjectWriter>
662 llvm::createMipsELFObjectWriter(raw_pwrite_stream &OS, const Triple &TT,
664 uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(TT.getOS());
665 bool IsN64 = TT.isArch64Bit() && !IsN32;
666 bool HasRelocationAddend = TT.isArch64Bit();
667 auto MOTW = llvm::make_unique<MipsELFObjectWriter>(
668 OSABI, HasRelocationAddend, IsN64, TT.isLittleEndian());
669 return createELFObjectWriter(std::move(MOTW), OS, TT.isLittleEndian());