aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/llvm14/lib/Target/PowerPC/MCTargetDesc/PPCELFObjectWriter.cpp
blob: 1e58039582c250699f9d782e9fbde69d7e8c7d14 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
//===-- PPCELFObjectWriter.cpp - PPC ELF Writer ---------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "MCTargetDesc/PPCFixupKinds.h"
#include "MCTargetDesc/PPCMCExpr.h"
#include "MCTargetDesc/PPCMCTargetDesc.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSymbolELF.h"
#include "llvm/MC/MCValue.h"
#include "llvm/Support/ErrorHandling.h"

using namespace llvm;

namespace {
  class PPCELFObjectWriter : public MCELFObjectTargetWriter {
  public:
    PPCELFObjectWriter(bool Is64Bit, uint8_t OSABI);

  protected:
    unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
                          const MCFixup &Fixup, bool IsPCRel) const override;

    bool needsRelocateWithSymbol(const MCSymbol &Sym,
                                 unsigned Type) const override;
  };
}

PPCELFObjectWriter::PPCELFObjectWriter(bool Is64Bit, uint8_t OSABI)
  : MCELFObjectTargetWriter(Is64Bit, OSABI,
                            Is64Bit ?  ELF::EM_PPC64 : ELF::EM_PPC,
                            /*HasRelocationAddend*/ true) {}

static MCSymbolRefExpr::VariantKind getAccessVariant(const MCValue &Target,
                                                     const MCFixup &Fixup) {
  const MCExpr *Expr = Fixup.getValue();

  if (Expr->getKind() != MCExpr::Target)
    return Target.getAccessVariant();

  switch (cast<PPCMCExpr>(Expr)->getKind()) {
  case PPCMCExpr::VK_PPC_None:
    return MCSymbolRefExpr::VK_None;
  case PPCMCExpr::VK_PPC_LO:
    return MCSymbolRefExpr::VK_PPC_LO;
  case PPCMCExpr::VK_PPC_HI:
    return MCSymbolRefExpr::VK_PPC_HI;
  case PPCMCExpr::VK_PPC_HA:
    return MCSymbolRefExpr::VK_PPC_HA;
  case PPCMCExpr::VK_PPC_HIGH:
    return MCSymbolRefExpr::VK_PPC_HIGH;
  case PPCMCExpr::VK_PPC_HIGHA:
    return MCSymbolRefExpr::VK_PPC_HIGHA;
  case PPCMCExpr::VK_PPC_HIGHERA:
    return MCSymbolRefExpr::VK_PPC_HIGHERA;
  case PPCMCExpr::VK_PPC_HIGHER:
    return MCSymbolRefExpr::VK_PPC_HIGHER;
  case PPCMCExpr::VK_PPC_HIGHEST:
    return MCSymbolRefExpr::VK_PPC_HIGHEST;
  case PPCMCExpr::VK_PPC_HIGHESTA:
    return MCSymbolRefExpr::VK_PPC_HIGHESTA;
  }
  llvm_unreachable("unknown PPCMCExpr kind");
}

unsigned PPCELFObjectWriter::getRelocType(MCContext &Ctx, const MCValue &Target,
                                          const MCFixup &Fixup,
                                          bool IsPCRel) const {
  MCFixupKind Kind = Fixup.getKind();
  if (Kind >= FirstLiteralRelocationKind)
    return Kind - FirstLiteralRelocationKind;
  MCSymbolRefExpr::VariantKind Modifier = getAccessVariant(Target, Fixup);

  // determine the type of the relocation
  unsigned Type;
  if (IsPCRel) {
    switch (Fixup.getTargetKind()) {
    default:
      llvm_unreachable("Unimplemented");
    case PPC::fixup_ppc_br24:
    case PPC::fixup_ppc_br24abs:
    case PPC::fixup_ppc_br24_notoc:
      switch (Modifier) {
      default: llvm_unreachable("Unsupported Modifier");
      case MCSymbolRefExpr::VK_None:
        Type = ELF::R_PPC_REL24;
        break;
      case MCSymbolRefExpr::VK_PLT:
        Type = ELF::R_PPC_PLTREL24;
        break;
      case MCSymbolRefExpr::VK_PPC_LOCAL:
        Type = ELF::R_PPC_LOCAL24PC;
        break;
      case MCSymbolRefExpr::VK_PPC_NOTOC:
        Type = ELF::R_PPC64_REL24_NOTOC;
        break;
      }
      break;
    case PPC::fixup_ppc_brcond14:
    case PPC::fixup_ppc_brcond14abs:
      Type = ELF::R_PPC_REL14;
      break;
    case PPC::fixup_ppc_half16:
      switch (Modifier) {
      default: llvm_unreachable("Unsupported Modifier");
      case MCSymbolRefExpr::VK_None:
        Type = ELF::R_PPC_REL16;
        break;
      case MCSymbolRefExpr::VK_PPC_LO:
        Type = ELF::R_PPC_REL16_LO;
        break;
      case MCSymbolRefExpr::VK_PPC_HI:
        Type = ELF::R_PPC_REL16_HI;
        break;
      case MCSymbolRefExpr::VK_PPC_HA:
        Type = ELF::R_PPC_REL16_HA;
        break;
      }
      break;
    case PPC::fixup_ppc_half16ds:
    case PPC::fixup_ppc_half16dq:
      Target.print(errs());
      errs() << '\n';
      report_fatal_error("Invalid PC-relative half16ds relocation");
    case PPC::fixup_ppc_pcrel34:
      switch (Modifier) {
      default:
        llvm_unreachable("Unsupported Modifier for fixup_ppc_pcrel34");
      case MCSymbolRefExpr::VK_PCREL:
        Type = ELF::R_PPC64_PCREL34;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_PCREL:
        Type = ELF::R_PPC64_GOT_PCREL34;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_PCREL:
        Type = ELF::R_PPC64_GOT_TLSGD_PCREL34;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_PCREL:
        Type = ELF::R_PPC64_GOT_TLSLD_PCREL34;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_TPREL_PCREL:
        Type = ELF::R_PPC64_GOT_TPREL_PCREL34;
        break;
      }
      break;
    case FK_Data_4:
    case FK_PCRel_4:
      Type = ELF::R_PPC_REL32;
      break;
    case FK_Data_8:
    case FK_PCRel_8:
      Type = ELF::R_PPC64_REL64;
      break;
    }
  } else {
    switch (Fixup.getTargetKind()) {
      default: llvm_unreachable("invalid fixup kind!");
    case PPC::fixup_ppc_br24abs:
      Type = ELF::R_PPC_ADDR24;
      break;
    case PPC::fixup_ppc_brcond14abs:
      Type = ELF::R_PPC_ADDR14; // XXX: or BRNTAKEN?_
      break;
    case PPC::fixup_ppc_half16:
      switch (Modifier) {
      default: llvm_unreachable("Unsupported Modifier");
      case MCSymbolRefExpr::VK_None:
        Type = ELF::R_PPC_ADDR16;
        break;
      case MCSymbolRefExpr::VK_PPC_LO:
        Type = ELF::R_PPC_ADDR16_LO;
        break;
      case MCSymbolRefExpr::VK_PPC_HI:
        Type = ELF::R_PPC_ADDR16_HI;
        break;
      case MCSymbolRefExpr::VK_PPC_HA:
        Type = ELF::R_PPC_ADDR16_HA;
        break;
      case MCSymbolRefExpr::VK_PPC_HIGH:
        Type = ELF::R_PPC64_ADDR16_HIGH;
        break;
      case MCSymbolRefExpr::VK_PPC_HIGHA:
        Type = ELF::R_PPC64_ADDR16_HIGHA;
        break;
      case MCSymbolRefExpr::VK_PPC_HIGHER:
        Type = ELF::R_PPC64_ADDR16_HIGHER;
        break;
      case MCSymbolRefExpr::VK_PPC_HIGHERA:
        Type = ELF::R_PPC64_ADDR16_HIGHERA;
        break;
      case MCSymbolRefExpr::VK_PPC_HIGHEST:
        Type = ELF::R_PPC64_ADDR16_HIGHEST;
        break;
      case MCSymbolRefExpr::VK_PPC_HIGHESTA:
        Type = ELF::R_PPC64_ADDR16_HIGHESTA;
        break;
      case MCSymbolRefExpr::VK_GOT:
        Type = ELF::R_PPC_GOT16;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_LO:
        Type = ELF::R_PPC_GOT16_LO;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_HI:
        Type = ELF::R_PPC_GOT16_HI;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_HA:
        Type = ELF::R_PPC_GOT16_HA;
        break;
      case MCSymbolRefExpr::VK_PPC_TOC:
        Type = ELF::R_PPC64_TOC16;
        break;
      case MCSymbolRefExpr::VK_PPC_TOC_LO:
        Type = ELF::R_PPC64_TOC16_LO;
        break;
      case MCSymbolRefExpr::VK_PPC_TOC_HI:
        Type = ELF::R_PPC64_TOC16_HI;
        break;
      case MCSymbolRefExpr::VK_PPC_TOC_HA:
        Type = ELF::R_PPC64_TOC16_HA;
        break;
      case MCSymbolRefExpr::VK_TPREL:
        Type = ELF::R_PPC_TPREL16;
        break;
      case MCSymbolRefExpr::VK_PPC_TPREL_LO:
        Type = ELF::R_PPC_TPREL16_LO;
        break;
      case MCSymbolRefExpr::VK_PPC_TPREL_HI:
        Type = ELF::R_PPC_TPREL16_HI;
        break;
      case MCSymbolRefExpr::VK_PPC_TPREL_HA:
        Type = ELF::R_PPC_TPREL16_HA;
        break;
      case MCSymbolRefExpr::VK_PPC_TPREL_HIGH:
        Type = ELF::R_PPC64_TPREL16_HIGH;
        break;
      case MCSymbolRefExpr::VK_PPC_TPREL_HIGHA:
        Type = ELF::R_PPC64_TPREL16_HIGHA;
        break;
      case MCSymbolRefExpr::VK_PPC_TPREL_HIGHER:
        Type = ELF::R_PPC64_TPREL16_HIGHER;
        break;
      case MCSymbolRefExpr::VK_PPC_TPREL_HIGHERA:
        Type = ELF::R_PPC64_TPREL16_HIGHERA;
        break;
      case MCSymbolRefExpr::VK_PPC_TPREL_HIGHEST:
        Type = ELF::R_PPC64_TPREL16_HIGHEST;
        break;
      case MCSymbolRefExpr::VK_PPC_TPREL_HIGHESTA:
        Type = ELF::R_PPC64_TPREL16_HIGHESTA;
        break;
      case MCSymbolRefExpr::VK_DTPREL:
        Type = ELF::R_PPC64_DTPREL16;
        break;
      case MCSymbolRefExpr::VK_PPC_DTPREL_LO:
        Type = ELF::R_PPC64_DTPREL16_LO;
        break;
      case MCSymbolRefExpr::VK_PPC_DTPREL_HI:
        Type = ELF::R_PPC64_DTPREL16_HI;
        break;
      case MCSymbolRefExpr::VK_PPC_DTPREL_HA:
        Type = ELF::R_PPC64_DTPREL16_HA;
        break;
      case MCSymbolRefExpr::VK_PPC_DTPREL_HIGH:
        Type = ELF::R_PPC64_DTPREL16_HIGH;
        break;
      case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHA:
        Type = ELF::R_PPC64_DTPREL16_HIGHA;
        break;
      case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHER:
        Type = ELF::R_PPC64_DTPREL16_HIGHER;
        break;
      case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHERA:
        Type = ELF::R_PPC64_DTPREL16_HIGHERA;
        break;
      case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHEST:
        Type = ELF::R_PPC64_DTPREL16_HIGHEST;
        break;
      case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHESTA:
        Type = ELF::R_PPC64_DTPREL16_HIGHESTA;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_TLSGD:
        if (is64Bit())
          Type = ELF::R_PPC64_GOT_TLSGD16;
        else
          Type = ELF::R_PPC_GOT_TLSGD16;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO:
        Type = ELF::R_PPC64_GOT_TLSGD16_LO;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HI:
        Type = ELF::R_PPC64_GOT_TLSGD16_HI;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA:
        Type = ELF::R_PPC64_GOT_TLSGD16_HA;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_TLSLD:
        if (is64Bit())
          Type = ELF::R_PPC64_GOT_TLSLD16;
        else
          Type = ELF::R_PPC_GOT_TLSLD16;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO:
        Type = ELF::R_PPC64_GOT_TLSLD16_LO;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HI:
        Type = ELF::R_PPC64_GOT_TLSLD16_HI;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA:
        Type = ELF::R_PPC64_GOT_TLSLD16_HA;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_TPREL:
        /* We don't have R_PPC64_GOT_TPREL16, but since GOT offsets
           are always 4-aligned, we can use R_PPC64_GOT_TPREL16_DS.  */
        Type = ELF::R_PPC64_GOT_TPREL16_DS;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO:
        /* We don't have R_PPC64_GOT_TPREL16_LO, but since GOT offsets
           are always 4-aligned, we can use R_PPC64_GOT_TPREL16_LO_DS.  */
        Type = ELF::R_PPC64_GOT_TPREL16_LO_DS;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HI:
        Type = ELF::R_PPC64_GOT_TPREL16_HI;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_DTPREL:
        /* We don't have R_PPC64_GOT_DTPREL16, but since GOT offsets
           are always 4-aligned, we can use R_PPC64_GOT_DTPREL16_DS.  */
        Type = ELF::R_PPC64_GOT_DTPREL16_DS;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_LO:
        /* We don't have R_PPC64_GOT_DTPREL16_LO, but since GOT offsets
           are always 4-aligned, we can use R_PPC64_GOT_DTPREL16_LO_DS.  */
        Type = ELF::R_PPC64_GOT_DTPREL16_LO_DS;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA:
        Type = ELF::R_PPC64_GOT_TPREL16_HA;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HI:
        Type = ELF::R_PPC64_GOT_DTPREL16_HI;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HA:
        Type = ELF::R_PPC64_GOT_DTPREL16_HA;
        break;
      }
      break;
    case PPC::fixup_ppc_half16ds:
    case PPC::fixup_ppc_half16dq:
      switch (Modifier) {
      default: llvm_unreachable("Unsupported Modifier");
      case MCSymbolRefExpr::VK_None:
        Type = ELF::R_PPC64_ADDR16_DS;
        break;
      case MCSymbolRefExpr::VK_PPC_LO:
        Type = ELF::R_PPC64_ADDR16_LO_DS;
        break;
      case MCSymbolRefExpr::VK_GOT:
        Type = ELF::R_PPC64_GOT16_DS;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_LO:
        Type = ELF::R_PPC64_GOT16_LO_DS;
        break;
      case MCSymbolRefExpr::VK_PPC_TOC:
        Type = ELF::R_PPC64_TOC16_DS;
        break;
      case MCSymbolRefExpr::VK_PPC_TOC_LO:
        Type = ELF::R_PPC64_TOC16_LO_DS;
        break;
      case MCSymbolRefExpr::VK_TPREL:
        Type = ELF::R_PPC64_TPREL16_DS;
        break;
      case MCSymbolRefExpr::VK_PPC_TPREL_LO:
        Type = ELF::R_PPC64_TPREL16_LO_DS;
        break;
      case MCSymbolRefExpr::VK_DTPREL:
        Type = ELF::R_PPC64_DTPREL16_DS;
        break;
      case MCSymbolRefExpr::VK_PPC_DTPREL_LO:
        Type = ELF::R_PPC64_DTPREL16_LO_DS;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_TPREL:
        Type = ELF::R_PPC64_GOT_TPREL16_DS;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO:
        Type = ELF::R_PPC64_GOT_TPREL16_LO_DS;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_DTPREL:
        Type = ELF::R_PPC64_GOT_DTPREL16_DS;
        break;
      case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_LO:
        Type = ELF::R_PPC64_GOT_DTPREL16_LO_DS;
        break;
      }
      break;
    case PPC::fixup_ppc_nofixup:
      switch (Modifier) {
      default: llvm_unreachable("Unsupported Modifier");
      case MCSymbolRefExpr::VK_PPC_TLSGD:
        if (is64Bit())
          Type = ELF::R_PPC64_TLSGD;
        else
          Type = ELF::R_PPC_TLSGD;
        break;
      case MCSymbolRefExpr::VK_PPC_TLSLD:
        if (is64Bit())
          Type = ELF::R_PPC64_TLSLD;
        else
          Type = ELF::R_PPC_TLSLD;
        break;
      case MCSymbolRefExpr::VK_PPC_TLS:
        if (is64Bit())
          Type = ELF::R_PPC64_TLS;
        else
          Type = ELF::R_PPC_TLS;
        break;
      case MCSymbolRefExpr::VK_PPC_TLS_PCREL:
        Type = ELF::R_PPC64_TLS;
        break;
      }
      break;
    case PPC::fixup_ppc_imm34:
      switch (Modifier) {
      default:
        report_fatal_error("Unsupported Modifier for fixup_ppc_imm34.");
      case MCSymbolRefExpr::VK_DTPREL:
        Type = ELF::R_PPC64_DTPREL34;
        break;
      case MCSymbolRefExpr::VK_TPREL:
        Type = ELF::R_PPC64_TPREL34;
        break;
      }
      break;
    case FK_Data_8:
      switch (Modifier) {
      default: llvm_unreachable("Unsupported Modifier");
      case MCSymbolRefExpr::VK_PPC_TOCBASE:
        Type = ELF::R_PPC64_TOC;
        break;
      case MCSymbolRefExpr::VK_None:
        Type = ELF::R_PPC64_ADDR64;
        break;
      case MCSymbolRefExpr::VK_PPC_DTPMOD:
        Type = ELF::R_PPC64_DTPMOD64;
        break;
      case MCSymbolRefExpr::VK_TPREL:
        Type = ELF::R_PPC64_TPREL64;
        break;
      case MCSymbolRefExpr::VK_DTPREL:
        Type = ELF::R_PPC64_DTPREL64;
        break;
      }
      break;
    case FK_Data_4:
      Type = ELF::R_PPC_ADDR32;
      break;
    case FK_Data_2:
      Type = ELF::R_PPC_ADDR16;
      break;
    }
  }
  return Type;
}

bool PPCELFObjectWriter::needsRelocateWithSymbol(const MCSymbol &Sym,
                                                 unsigned Type) const {
  switch (Type) {
    default:
      return false;

    case ELF::R_PPC_REL24:
    case ELF::R_PPC64_REL24_NOTOC:
      // If the target symbol has a local entry point, we must keep the
      // target symbol to preserve that information for the linker.
      // The "other" values are stored in the last 6 bits of the second byte.
      // The traditional defines for STO values assume the full byte and thus
      // the shift to pack it.
      unsigned Other = cast<MCSymbolELF>(Sym).getOther() << 2;
      return (Other & ELF::STO_PPC64_LOCAL_MASK) != 0;
  }
}

std::unique_ptr<MCObjectTargetWriter>
llvm::createPPCELFObjectWriter(bool Is64Bit, uint8_t OSABI) {
  return std::make_unique<PPCELFObjectWriter>(Is64Bit, OSABI);
}