1//===-- MipsELFObjectWriter.cpp - Mips ELF Writer -------------------------===//
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#include "MCTargetDesc/MipsFixupKinds.h"
10#include "MCTargetDesc/MipsMCAsmInfo.h"
11#include "MCTargetDesc/MipsMCTargetDesc.h"
12#include "llvm/ADT/STLExtras.h"
13#include "llvm/BinaryFormat/ELF.h"
14#include "llvm/MC/MCContext.h"
15#include "llvm/MC/MCELFObjectWriter.h"
16#include "llvm/MC/MCFixup.h"
17#include "llvm/MC/MCObjectWriter.h"
18#include "llvm/MC/MCSymbolELF.h"
19#include "llvm/MC/MCValue.h"
20#include "llvm/Support/Casting.h"
21#include "llvm/Support/Compiler.h"
22#include "llvm/Support/Debug.h"
23#include "llvm/Support/ErrorHandling.h"
24#include "llvm/Support/MathExtras.h"
25#include "llvm/Support/raw_ostream.h"
26#include <cassert>
27#include <cstdint>
28#include <iterator>
29#include <list>
30#include <utility>
31
32#define DEBUG_TYPE "mips-elf-object-writer"
33
34using namespace llvm;
35
36namespace {
37
38/// Holds additional information needed by the relocation ordering algorithm.
39struct MipsRelocationEntry {
40 const ELFRelocationEntry R; ///< The relocation.
41 bool Matched = false; ///< Is this relocation part of a match.
42
43 MipsRelocationEntry(const ELFRelocationEntry &R) : R(R) {}
44};
45
46class MipsELFObjectWriter : public MCELFObjectTargetWriter {
47public:
48 MipsELFObjectWriter(uint8_t OSABI, bool HasRelocationAddend, bool Is64);
49
50 ~MipsELFObjectWriter() override = default;
51
52 unsigned getRelocType(const MCFixup &, const MCValue &,
53 bool IsPCRel) const override;
54 bool needsRelocateWithSymbol(const MCValue &, unsigned Type) const override;
55 void sortRelocs(std::vector<ELFRelocationEntry> &Relocs) override;
56};
57
58/// The possible results of the Predicate function used by find_best.
59enum FindBestPredicateResult {
60 FindBest_NoMatch = 0, ///< The current element is not a match.
61 FindBest_Match, ///< The current element is a match but better ones are
62 /// possible.
63 FindBest_PerfectMatch, ///< The current element is an unbeatable match.
64};
65
66} // end anonymous namespace
67
68/// Copy elements in the range [First, Last) to d1 when the predicate is true or
69/// d2 when the predicate is false. This is essentially both std::copy_if and
70/// std::remove_copy_if combined into a single pass.
71template <class InputIt, class OutputIt1, class OutputIt2, class UnaryPredicate>
72static std::pair<OutputIt1, OutputIt2> copy_if_else(InputIt First, InputIt Last,
73 OutputIt1 d1, OutputIt2 d2,
74 UnaryPredicate Predicate) {
75 for (InputIt I = First; I != Last; ++I) {
76 if (Predicate(*I)) {
77 *d1 = *I;
78 d1++;
79 } else {
80 *d2 = *I;
81 d2++;
82 }
83 }
84
85 return std::make_pair(d1, d2);
86}
87
88/// Find the best match in the range [First, Last).
89///
90/// An element matches when Predicate(X) returns FindBest_Match or
91/// FindBest_PerfectMatch. A value of FindBest_PerfectMatch also terminates
92/// the search. BetterThan(A, B) is a comparator that returns true when A is a
93/// better match than B. The return value is the position of the best match.
94///
95/// This is similar to std::find_if but finds the best of multiple possible
96/// matches.
97template <class InputIt, class UnaryPredicate, class Comparator>
98static InputIt find_best(InputIt First, InputIt Last, UnaryPredicate Predicate,
99 Comparator BetterThan) {
100 InputIt Best = Last;
101
102 for (InputIt I = First; I != Last; ++I) {
103 unsigned Matched = Predicate(*I);
104 if (Matched != FindBest_NoMatch) {
105 if (Best == Last || BetterThan(*I, *Best))
106 Best = I;
107 }
108 if (Matched == FindBest_PerfectMatch)
109 break;
110 }
111
112 return Best;
113}
114
115/// Determine the low relocation that matches the given relocation.
116/// If the relocation does not need a low relocation then the return value
117/// is ELF::R_MIPS_NONE.
118///
119/// The relocations that need a matching low part are
120/// R_(MIPS|MICROMIPS|MIPS16)_HI16 for all symbols and
121/// R_(MIPS|MICROMIPS|MIPS16)_GOT16 for local symbols only.
122static unsigned getMatchingLoType(const ELFRelocationEntry &Reloc) {
123 unsigned Type = Reloc.Type;
124 if (Type == ELF::R_MIPS_HI16)
125 return ELF::R_MIPS_LO16;
126 if (Type == ELF::R_MICROMIPS_HI16)
127 return ELF::R_MICROMIPS_LO16;
128 if (Type == ELF::R_MIPS16_HI16)
129 return ELF::R_MIPS16_LO16;
130
131 if (Reloc.Symbol && Reloc.Symbol->getBinding() != ELF::STB_LOCAL)
132 return ELF::R_MIPS_NONE;
133
134 if (Type == ELF::R_MIPS_GOT16)
135 return ELF::R_MIPS_LO16;
136 if (Type == ELF::R_MICROMIPS_GOT16)
137 return ELF::R_MICROMIPS_LO16;
138 if (Type == ELF::R_MIPS16_GOT16)
139 return ELF::R_MIPS16_LO16;
140
141 return ELF::R_MIPS_NONE;
142}
143
144// Determine whether a relocation X is a low-part and matches the high-part R
145// perfectly by symbol and addend.
146static bool isMatchingReloc(unsigned MatchingType, const ELFRelocationEntry &R,
147 const ELFRelocationEntry &X) {
148 return X.Type == MatchingType && X.Symbol == R.Symbol && X.Addend == R.Addend;
149}
150
151MipsELFObjectWriter::MipsELFObjectWriter(uint8_t OSABI,
152 bool HasRelocationAddend, bool Is64)
153 : MCELFObjectTargetWriter(Is64, OSABI, ELF::EM_MIPS, HasRelocationAddend) {}
154
155unsigned MipsELFObjectWriter::getRelocType(const MCFixup &Fixup,
156 const MCValue &Target,
157 bool IsPCRel) const {
158 // Determine the type of the relocation.
159 unsigned Kind = Fixup.getTargetKind();
160 switch (Target.getSpecifier()) {
161 case Mips::S_DTPREL:
162 case Mips::S_DTPREL_HI:
163 case Mips::S_DTPREL_LO:
164 case Mips::S_TLSLDM:
165 case Mips::S_TLSGD:
166 case Mips::S_GOTTPREL:
167 case Mips::S_TPREL_HI:
168 case Mips::S_TPREL_LO:
169 if (auto *SA = Target.getAddSym())
170 cast<MCSymbolELF>(Val: SA)->setType(ELF::STT_TLS);
171 break;
172 default:
173 break;
174 }
175
176 switch (Kind) {
177 case FK_NONE:
178 return ELF::R_MIPS_NONE;
179 case FK_Data_1:
180 reportError(L: Fixup.getLoc(), Msg: "MIPS does not support one byte relocations");
181 return ELF::R_MIPS_NONE;
182 case Mips::fixup_Mips_16:
183 case FK_Data_2:
184 return IsPCRel ? ELF::R_MIPS_PC16 : ELF::R_MIPS_16;
185 case Mips::fixup_Mips_32:
186 case FK_Data_4:
187 return IsPCRel ? ELF::R_MIPS_PC32 : ELF::R_MIPS_32;
188 case Mips::fixup_Mips_64:
189 case FK_Data_8:
190 return IsPCRel
191 ? setRTypes(Value1: ELF::R_MIPS_PC32, Value2: ELF::R_MIPS_64, Value3: ELF::R_MIPS_NONE)
192 : (unsigned)ELF::R_MIPS_64;
193 }
194
195 if (IsPCRel) {
196 switch (Kind) {
197 case Mips::fixup_Mips_Branch_PCRel:
198 case Mips::fixup_Mips_PC16:
199 return ELF::R_MIPS_PC16;
200 case Mips::fixup_MICROMIPS_PC7_S1:
201 return ELF::R_MICROMIPS_PC7_S1;
202 case Mips::fixup_MICROMIPS_PC10_S1:
203 return ELF::R_MICROMIPS_PC10_S1;
204 case Mips::fixup_MICROMIPS_PC16_S1:
205 return ELF::R_MICROMIPS_PC16_S1;
206 case Mips::fixup_MICROMIPS_PC26_S1:
207 return ELF::R_MICROMIPS_PC26_S1;
208 case Mips::fixup_MICROMIPS_PC19_S2:
209 return ELF::R_MICROMIPS_PC19_S2;
210 case Mips::fixup_MICROMIPS_PC18_S3:
211 return ELF::R_MICROMIPS_PC18_S3;
212 case Mips::fixup_MICROMIPS_PC21_S1:
213 return ELF::R_MICROMIPS_PC21_S1;
214 case Mips::fixup_MIPS_PC19_S2:
215 return ELF::R_MIPS_PC19_S2;
216 case Mips::fixup_MIPS_PC18_S3:
217 return ELF::R_MIPS_PC18_S3;
218 case Mips::fixup_MIPS_PC21_S2:
219 return ELF::R_MIPS_PC21_S2;
220 case Mips::fixup_MIPS_PC26_S2:
221 return ELF::R_MIPS_PC26_S2;
222 case Mips::fixup_MIPS_PCHI16:
223 return ELF::R_MIPS_PCHI16;
224 case Mips::fixup_MIPS_PCLO16:
225 return ELF::R_MIPS_PCLO16;
226 }
227
228 llvm_unreachable("invalid PC-relative fixup kind!");
229 }
230
231 switch (Kind) {
232 case Mips::fixup_Mips_DTPREL32:
233 return ELF::R_MIPS_TLS_DTPREL32;
234 case Mips::fixup_Mips_DTPREL64:
235 return ELF::R_MIPS_TLS_DTPREL64;
236 case Mips::fixup_Mips_TPREL32:
237 return ELF::R_MIPS_TLS_TPREL32;
238 case Mips::fixup_Mips_TPREL64:
239 return ELF::R_MIPS_TLS_TPREL64;
240 case Mips::fixup_Mips_GPREL32:
241 return setRTypes(Value1: ELF::R_MIPS_GPREL32,
242 Value2: is64Bit() ? ELF::R_MIPS_64 : ELF::R_MIPS_NONE,
243 Value3: ELF::R_MIPS_NONE);
244 case Mips::fixup_Mips_GPREL16:
245 return ELF::R_MIPS_GPREL16;
246 case Mips::fixup_Mips_26:
247 return ELF::R_MIPS_26;
248 case Mips::fixup_Mips_CALL16:
249 return ELF::R_MIPS_CALL16;
250 case Mips::fixup_Mips_GOT:
251 return ELF::R_MIPS_GOT16;
252 case Mips::fixup_Mips_HI16:
253 return ELF::R_MIPS_HI16;
254 case Mips::fixup_Mips_LO16:
255 return ELF::R_MIPS_LO16;
256 case Mips::fixup_Mips_TLSGD:
257 return ELF::R_MIPS_TLS_GD;
258 case Mips::fixup_Mips_GOTTPREL:
259 return ELF::R_MIPS_TLS_GOTTPREL;
260 case Mips::fixup_Mips_TPREL_HI:
261 return ELF::R_MIPS_TLS_TPREL_HI16;
262 case Mips::fixup_Mips_TPREL_LO:
263 return ELF::R_MIPS_TLS_TPREL_LO16;
264 case Mips::fixup_Mips_TLSLDM:
265 return ELF::R_MIPS_TLS_LDM;
266 case Mips::fixup_Mips_DTPREL_HI:
267 return ELF::R_MIPS_TLS_DTPREL_HI16;
268 case Mips::fixup_Mips_DTPREL_LO:
269 return ELF::R_MIPS_TLS_DTPREL_LO16;
270 case Mips::fixup_Mips_GOT_PAGE:
271 return ELF::R_MIPS_GOT_PAGE;
272 case Mips::fixup_Mips_GOT_OFST:
273 return ELF::R_MIPS_GOT_OFST;
274 case Mips::fixup_Mips_GOT_DISP:
275 return ELF::R_MIPS_GOT_DISP;
276 case Mips::fixup_Mips_GPOFF_HI:
277 return setRTypes(Value1: ELF::R_MIPS_GPREL16, Value2: ELF::R_MIPS_SUB, Value3: ELF::R_MIPS_HI16);
278 case Mips::fixup_MICROMIPS_GPOFF_HI:
279 return setRTypes(Value1: ELF::R_MICROMIPS_GPREL16, Value2: ELF::R_MICROMIPS_SUB,
280 Value3: ELF::R_MICROMIPS_HI16);
281 case Mips::fixup_Mips_GPOFF_LO:
282 return setRTypes(Value1: ELF::R_MIPS_GPREL16, Value2: ELF::R_MIPS_SUB, Value3: ELF::R_MIPS_LO16);
283 case Mips::fixup_MICROMIPS_GPOFF_LO:
284 return setRTypes(Value1: ELF::R_MICROMIPS_GPREL16, Value2: ELF::R_MICROMIPS_SUB,
285 Value3: ELF::R_MICROMIPS_LO16);
286 case Mips::fixup_Mips_HIGHER:
287 return ELF::R_MIPS_HIGHER;
288 case Mips::fixup_Mips_HIGHEST:
289 return ELF::R_MIPS_HIGHEST;
290 case Mips::fixup_Mips_SUB:
291 return ELF::R_MIPS_SUB;
292 case Mips::fixup_Mips_GOT_HI16:
293 return ELF::R_MIPS_GOT_HI16;
294 case Mips::fixup_Mips_GOT_LO16:
295 return ELF::R_MIPS_GOT_LO16;
296 case Mips::fixup_Mips_CALL_HI16:
297 return ELF::R_MIPS_CALL_HI16;
298 case Mips::fixup_Mips_CALL_LO16:
299 return ELF::R_MIPS_CALL_LO16;
300 case Mips::fixup_MICROMIPS_26_S1:
301 return ELF::R_MICROMIPS_26_S1;
302 case Mips::fixup_MICROMIPS_HI16:
303 return ELF::R_MICROMIPS_HI16;
304 case Mips::fixup_MICROMIPS_LO16:
305 return ELF::R_MICROMIPS_LO16;
306 case Mips::fixup_MICROMIPS_GOT16:
307 return ELF::R_MICROMIPS_GOT16;
308 case Mips::fixup_MICROMIPS_CALL16:
309 return ELF::R_MICROMIPS_CALL16;
310 case Mips::fixup_MICROMIPS_GOT_DISP:
311 return ELF::R_MICROMIPS_GOT_DISP;
312 case Mips::fixup_MICROMIPS_GOT_PAGE:
313 return ELF::R_MICROMIPS_GOT_PAGE;
314 case Mips::fixup_MICROMIPS_GOT_OFST:
315 return ELF::R_MICROMIPS_GOT_OFST;
316 case Mips::fixup_MICROMIPS_TLS_GD:
317 return ELF::R_MICROMIPS_TLS_GD;
318 case Mips::fixup_MICROMIPS_TLS_LDM:
319 return ELF::R_MICROMIPS_TLS_LDM;
320 case Mips::fixup_MICROMIPS_TLS_DTPREL_HI16:
321 return ELF::R_MICROMIPS_TLS_DTPREL_HI16;
322 case Mips::fixup_MICROMIPS_TLS_DTPREL_LO16:
323 return ELF::R_MICROMIPS_TLS_DTPREL_LO16;
324 case Mips::fixup_MICROMIPS_GOTTPREL:
325 return ELF::R_MICROMIPS_TLS_GOTTPREL;
326 case Mips::fixup_MICROMIPS_TLS_TPREL_HI16:
327 return ELF::R_MICROMIPS_TLS_TPREL_HI16;
328 case Mips::fixup_MICROMIPS_TLS_TPREL_LO16:
329 return ELF::R_MICROMIPS_TLS_TPREL_LO16;
330 case Mips::fixup_MICROMIPS_SUB:
331 return ELF::R_MICROMIPS_SUB;
332 case Mips::fixup_MICROMIPS_HIGHER:
333 return ELF::R_MICROMIPS_HIGHER;
334 case Mips::fixup_MICROMIPS_HIGHEST:
335 return ELF::R_MICROMIPS_HIGHEST;
336 case Mips::fixup_Mips_JALR:
337 return ELF::R_MIPS_JALR;
338 case Mips::fixup_MICROMIPS_JALR:
339 return ELF::R_MICROMIPS_JALR;
340 }
341
342 reportError(L: Fixup.getLoc(), Msg: "unsupported relocation type");
343 return ELF::R_MIPS_NONE;
344}
345
346/// Sort relocation table entries by offset except where another order is
347/// required by the MIPS ABI.
348///
349/// MIPS has a few relocations that have an AHL component in the expression used
350/// to evaluate them. This AHL component is an addend with the same number of
351/// bits as a symbol value but not all of our ABI's are able to supply a
352/// sufficiently sized addend in a single relocation.
353///
354/// The O32 ABI for example, uses REL relocations which store the addend in the
355/// section data. All the relocations with AHL components affect 16-bit fields
356/// so the addend for a single relocation is limited to 16-bit. This ABI
357/// resolves the limitation by linking relocations (e.g. R_MIPS_HI16 and
358/// R_MIPS_LO16) and distributing the addend between the linked relocations. The
359/// ABI mandates that such relocations must be next to each other in a
360/// particular order (e.g. R_MIPS_HI16 must be immediately followed by a
361/// matching R_MIPS_LO16) but the rule is less strict in practice.
362///
363/// The de facto standard is lenient in the following ways:
364/// - 'Immediately following' does not refer to the next relocation entry but
365/// the next matching relocation.
366/// - There may be multiple high parts relocations for one low part relocation.
367/// - There may be multiple low part relocations for one high part relocation.
368/// - The AHL addend in each part does not have to be exactly equal as long as
369/// the difference does not affect the carry bit from bit 15 into 16. This is
370/// to allow, for example, the use of %lo(foo) and %lo(foo+4) when loading
371/// both halves of a long long.
372///
373/// See getMatchingLoType() for a description of which high part relocations
374/// match which low part relocations. One particular thing to note is that
375/// R_MIPS_GOT16 and similar only have AHL addends if they refer to local
376/// symbols.
377///
378/// It should also be noted that this function is not affected by whether
379/// the symbol was kept or rewritten into a section-relative equivalent. We
380/// always match using the expressions from the source.
381void MipsELFObjectWriter::sortRelocs(std::vector<ELFRelocationEntry> &Relocs) {
382 // We do not need to sort the relocation table for RELA relocations which
383 // N32/N64 uses as the relocation addend contains the value we require,
384 // rather than it being split across a pair of relocations.
385 if (hasRelocationAddend())
386 return;
387
388 // Sort relocations by the address they are applied to.
389 llvm::sort(C&: Relocs,
390 Comp: [](const ELFRelocationEntry &A, const ELFRelocationEntry &B) {
391 return A.Offset < B.Offset;
392 });
393
394 // Place relocations in a list for reorder convenience. Hi16 contains the
395 // iterators of high-part relocations.
396 std::list<MipsRelocationEntry> Sorted;
397 SmallVector<std::list<MipsRelocationEntry>::iterator, 0> Hi16;
398 for (auto &R : Relocs) {
399 Sorted.push_back(x: R);
400 if (getMatchingLoType(Reloc: R) != ELF::R_MIPS_NONE)
401 Hi16.push_back(Elt: std::prev(x: Sorted.end()));
402 }
403
404 for (auto I : Hi16) {
405 auto &R = I->R;
406 unsigned MatchingType = getMatchingLoType(Reloc: R);
407 // If the next relocation is a perfect match, continue;
408 if (std::next(x: I) != Sorted.end() &&
409 isMatchingReloc(MatchingType, R, X: std::next(x: I)->R))
410 continue;
411 // Otherwise, find the best matching low-part relocation with the following
412 // criteria. It must have the same symbol and its addend is no lower than
413 // that of the current high-part.
414 //
415 // (1) %lo with a smaller offset is preferred.
416 // (2) %lo with the same offset that is unmatched is preferred.
417 // (3) later %lo is preferred.
418 auto Best = Sorted.end();
419 for (auto J = Sorted.begin(); J != Sorted.end(); ++J) {
420 auto &R1 = J->R;
421 if (R1.Type == MatchingType && R.Symbol == R1.Symbol &&
422 R.Addend <= R1.Addend &&
423 (Best == Sorted.end() || R1.Addend < Best->R.Addend ||
424 (!Best->Matched && R1.Addend == Best->R.Addend)))
425 Best = J;
426 }
427 if (Best != Sorted.end() && R.Addend == Best->R.Addend)
428 Best->Matched = true;
429
430 // Move the high-part before the low-part, or if not found, the end of the
431 // list. The unmatched high-part will lead to a linker warning/error.
432 Sorted.splice(position: Best, x&: Sorted, i: I);
433 }
434
435 assert(Relocs.size() == Sorted.size() && "Some relocs were not consumed");
436
437 // Overwrite the original vector with the sorted elements.
438 unsigned CopyTo = 0;
439 for (const auto &R : Sorted)
440 Relocs[CopyTo++] = R.R;
441}
442
443bool MipsELFObjectWriter::needsRelocateWithSymbol(const MCValue &V,
444 unsigned Type) const {
445 // If it's a compound relocation for N64 then we need the relocation if any
446 // sub-relocation needs it.
447 if (!isUInt<8>(x: Type))
448 return needsRelocateWithSymbol(V, Type: Type & 0xff) ||
449 needsRelocateWithSymbol(V, Type: (Type >> 8) & 0xff) ||
450 needsRelocateWithSymbol(V, Type: (Type >> 16) & 0xff);
451
452 switch (Type) {
453 default:
454 errs() << Type << "\n";
455 llvm_unreachable("Unexpected relocation");
456 return true;
457
458 // This relocation doesn't affect the section data.
459 case ELF::R_MIPS_NONE:
460 return false;
461
462 // On REL ABI's (e.g. O32), these relocations form pairs. The pairing is done
463 // by the static linker by matching the symbol and offset.
464 // We only see one relocation at a time but it's still safe to relocate with
465 // the section so long as both relocations make the same decision.
466 //
467 // Some older linkers may require the symbol for particular cases. Such cases
468 // are not supported yet but can be added as required.
469 case ELF::R_MIPS_GOT16:
470 case ELF::R_MIPS16_GOT16:
471 case ELF::R_MICROMIPS_GOT16:
472 case ELF::R_MIPS_HIGHER:
473 case ELF::R_MIPS_HIGHEST:
474 case ELF::R_MIPS_HI16:
475 case ELF::R_MIPS16_HI16:
476 case ELF::R_MICROMIPS_HI16:
477 case ELF::R_MIPS_LO16:
478 case ELF::R_MIPS16_LO16:
479 case ELF::R_MICROMIPS_LO16:
480 // FIXME: It should be safe to return false for the STO_MIPS_MICROMIPS but
481 // we neglect to handle the adjustment to the LSB of the addend that
482 // it causes in applyFixup() and similar.
483 if (cast<MCSymbolELF>(Val: V.getAddSym())->getOther() & ELF::STO_MIPS_MICROMIPS)
484 return true;
485 return false;
486
487 case ELF::R_MIPS_GOT_PAGE:
488 case ELF::R_MICROMIPS_GOT_PAGE:
489 case ELF::R_MIPS_GOT_OFST:
490 case ELF::R_MICROMIPS_GOT_OFST:
491 case ELF::R_MIPS_16:
492 case ELF::R_MIPS_32:
493 case ELF::R_MIPS_GPREL32:
494 if (cast<MCSymbolELF>(Val: V.getAddSym())->getOther() & ELF::STO_MIPS_MICROMIPS)
495 return true;
496 [[fallthrough]];
497 case ELF::R_MIPS_26:
498 case ELF::R_MIPS_64:
499 case ELF::R_MIPS_GPREL16:
500 case ELF::R_MIPS_PC16:
501 case ELF::R_MIPS_SUB:
502 return false;
503
504 // FIXME: Many of these relocations should probably return false but this
505 // hasn't been confirmed to be safe yet.
506 case ELF::R_MIPS_REL32:
507 case ELF::R_MIPS_LITERAL:
508 case ELF::R_MIPS_CALL16:
509 case ELF::R_MIPS_SHIFT5:
510 case ELF::R_MIPS_SHIFT6:
511 case ELF::R_MIPS_GOT_DISP:
512 case ELF::R_MIPS_GOT_HI16:
513 case ELF::R_MIPS_GOT_LO16:
514 case ELF::R_MIPS_INSERT_A:
515 case ELF::R_MIPS_INSERT_B:
516 case ELF::R_MIPS_DELETE:
517 case ELF::R_MIPS_CALL_HI16:
518 case ELF::R_MIPS_CALL_LO16:
519 case ELF::R_MIPS_SCN_DISP:
520 case ELF::R_MIPS_REL16:
521 case ELF::R_MIPS_ADD_IMMEDIATE:
522 case ELF::R_MIPS_PJUMP:
523 case ELF::R_MIPS_RELGOT:
524 case ELF::R_MIPS_JALR:
525 case ELF::R_MIPS_TLS_DTPMOD32:
526 case ELF::R_MIPS_TLS_DTPREL32:
527 case ELF::R_MIPS_TLS_DTPMOD64:
528 case ELF::R_MIPS_TLS_DTPREL64:
529 case ELF::R_MIPS_TLS_GD:
530 case ELF::R_MIPS_TLS_LDM:
531 case ELF::R_MIPS_TLS_DTPREL_HI16:
532 case ELF::R_MIPS_TLS_DTPREL_LO16:
533 case ELF::R_MIPS_TLS_GOTTPREL:
534 case ELF::R_MIPS_TLS_TPREL32:
535 case ELF::R_MIPS_TLS_TPREL64:
536 case ELF::R_MIPS_TLS_TPREL_HI16:
537 case ELF::R_MIPS_TLS_TPREL_LO16:
538 case ELF::R_MIPS_GLOB_DAT:
539 case ELF::R_MIPS_PC21_S2:
540 case ELF::R_MIPS_PC26_S2:
541 case ELF::R_MIPS_PC18_S3:
542 case ELF::R_MIPS_PC19_S2:
543 case ELF::R_MIPS_PCHI16:
544 case ELF::R_MIPS_PCLO16:
545 case ELF::R_MIPS_COPY:
546 case ELF::R_MIPS_JUMP_SLOT:
547 case ELF::R_MIPS_NUM:
548 case ELF::R_MIPS_PC32:
549 case ELF::R_MIPS_EH:
550 case ELF::R_MICROMIPS_26_S1:
551 case ELF::R_MICROMIPS_GPREL16:
552 case ELF::R_MICROMIPS_LITERAL:
553 case ELF::R_MICROMIPS_PC7_S1:
554 case ELF::R_MICROMIPS_PC10_S1:
555 case ELF::R_MICROMIPS_PC16_S1:
556 case ELF::R_MICROMIPS_CALL16:
557 case ELF::R_MICROMIPS_GOT_DISP:
558 case ELF::R_MICROMIPS_GOT_HI16:
559 case ELF::R_MICROMIPS_GOT_LO16:
560 case ELF::R_MICROMIPS_SUB:
561 case ELF::R_MICROMIPS_HIGHER:
562 case ELF::R_MICROMIPS_HIGHEST:
563 case ELF::R_MICROMIPS_CALL_HI16:
564 case ELF::R_MICROMIPS_CALL_LO16:
565 case ELF::R_MICROMIPS_SCN_DISP:
566 case ELF::R_MICROMIPS_JALR:
567 case ELF::R_MICROMIPS_HI0_LO16:
568 case ELF::R_MICROMIPS_TLS_GD:
569 case ELF::R_MICROMIPS_TLS_LDM:
570 case ELF::R_MICROMIPS_TLS_DTPREL_HI16:
571 case ELF::R_MICROMIPS_TLS_DTPREL_LO16:
572 case ELF::R_MICROMIPS_TLS_GOTTPREL:
573 case ELF::R_MICROMIPS_TLS_TPREL_HI16:
574 case ELF::R_MICROMIPS_TLS_TPREL_LO16:
575 case ELF::R_MICROMIPS_GPREL7_S2:
576 case ELF::R_MICROMIPS_PC23_S2:
577 case ELF::R_MICROMIPS_PC21_S1:
578 case ELF::R_MICROMIPS_PC26_S1:
579 case ELF::R_MICROMIPS_PC18_S3:
580 case ELF::R_MICROMIPS_PC19_S2:
581 return true;
582
583 // FIXME: Many of these should probably return false but MIPS16 isn't
584 // supported by the integrated assembler.
585 case ELF::R_MIPS16_26:
586 case ELF::R_MIPS16_GPREL:
587 case ELF::R_MIPS16_CALL16:
588 case ELF::R_MIPS16_TLS_GD:
589 case ELF::R_MIPS16_TLS_LDM:
590 case ELF::R_MIPS16_TLS_DTPREL_HI16:
591 case ELF::R_MIPS16_TLS_DTPREL_LO16:
592 case ELF::R_MIPS16_TLS_GOTTPREL:
593 case ELF::R_MIPS16_TLS_TPREL_HI16:
594 case ELF::R_MIPS16_TLS_TPREL_LO16:
595 llvm_unreachable("Unsupported MIPS16 relocation");
596 return true;
597 }
598}
599
600std::unique_ptr<MCObjectTargetWriter>
601llvm::createMipsELFObjectWriter(const Triple &TT, bool IsN32) {
602 uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(OSType: TT.getOS());
603 bool IsN64 = TT.isArch64Bit() && !IsN32;
604 bool HasRelocationAddend = TT.isArch64Bit();
605 return std::make_unique<MipsELFObjectWriter>(args&: OSABI, args&: HasRelocationAddend,
606 args&: IsN64);
607}
608