1 //===-- PPCELFObjectWriter.cpp - PPC 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/PPCMCTargetDesc.h"
11 #include "MCTargetDesc/PPCFixupKinds.h"
12 #include "llvm/ADT/STLExtras.h"
13 #include "llvm/MC/MCELFObjectWriter.h"
14 #include "llvm/MC/MCExpr.h"
15 #include "llvm/MC/MCValue.h"
16 #include "llvm/Support/ErrorHandling.h"
21 class PPCELFObjectWriter : public MCELFObjectTargetWriter {
23 PPCELFObjectWriter(bool Is64Bit, uint8_t OSABI);
25 virtual ~PPCELFObjectWriter();
27 virtual unsigned getRelocTypeInner(const MCValue &Target,
30 virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
31 bool IsPCRel, bool IsRelocWithSymbol,
32 int64_t Addend) const;
33 virtual const MCSymbol *ExplicitRelSym(const MCAssembler &Asm,
34 const MCValue &Target,
38 virtual const MCSymbol *undefinedExplicitRelSym(const MCValue &Target,
44 PPCELFObjectWriter::PPCELFObjectWriter(bool Is64Bit, uint8_t OSABI)
45 : MCELFObjectTargetWriter(Is64Bit, OSABI,
46 Is64Bit ? ELF::EM_PPC64 : ELF::EM_PPC,
47 /*HasRelocationAddend*/ true) {}
49 PPCELFObjectWriter::~PPCELFObjectWriter() {
52 unsigned PPCELFObjectWriter::getRelocTypeInner(const MCValue &Target,
56 MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
57 MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
59 // determine the type of the relocation
62 switch ((unsigned)Fixup.getKind()) {
64 llvm_unreachable("Unimplemented");
65 case PPC::fixup_ppc_br24:
66 case PPC::fixup_ppc_br24abs:
67 Type = ELF::R_PPC_REL24;
69 case PPC::fixup_ppc_brcond14:
70 case PPC::fixup_ppc_brcond14abs:
71 Type = ELF::R_PPC_REL14;
73 case PPC::fixup_ppc_half16:
75 default: llvm_unreachable("Unsupported Modifier");
76 case MCSymbolRefExpr::VK_None:
77 Type = ELF::R_PPC_REL16;
79 case MCSymbolRefExpr::VK_PPC_LO:
80 Type = ELF::R_PPC_REL16_LO;
82 case MCSymbolRefExpr::VK_PPC_HI:
83 Type = ELF::R_PPC_REL16_HI;
85 case MCSymbolRefExpr::VK_PPC_HA:
86 Type = ELF::R_PPC_REL16_HA;
92 Type = ELF::R_PPC_REL32;
96 Type = ELF::R_PPC64_REL64;
100 switch ((unsigned)Fixup.getKind()) {
101 default: llvm_unreachable("invalid fixup kind!");
102 case PPC::fixup_ppc_br24abs:
103 Type = ELF::R_PPC_ADDR24;
105 case PPC::fixup_ppc_brcond14abs:
106 Type = ELF::R_PPC_ADDR14; // XXX: or BRNTAKEN?_
108 case PPC::fixup_ppc_half16:
110 default: llvm_unreachable("Unsupported Modifier");
111 case MCSymbolRefExpr::VK_None:
112 Type = ELF::R_PPC_ADDR16;
114 case MCSymbolRefExpr::VK_PPC_LO:
115 Type = ELF::R_PPC_ADDR16_LO;
117 case MCSymbolRefExpr::VK_PPC_HI:
118 Type = ELF::R_PPC_ADDR16_HI;
120 case MCSymbolRefExpr::VK_PPC_HA:
121 Type = ELF::R_PPC_ADDR16_HA;
123 case MCSymbolRefExpr::VK_PPC_HIGHER:
124 Type = ELF::R_PPC64_ADDR16_HIGHER;
126 case MCSymbolRefExpr::VK_PPC_HIGHERA:
127 Type = ELF::R_PPC64_ADDR16_HIGHERA;
129 case MCSymbolRefExpr::VK_PPC_HIGHEST:
130 Type = ELF::R_PPC64_ADDR16_HIGHEST;
132 case MCSymbolRefExpr::VK_PPC_HIGHESTA:
133 Type = ELF::R_PPC64_ADDR16_HIGHESTA;
135 case MCSymbolRefExpr::VK_GOT:
136 Type = ELF::R_PPC_GOT16;
138 case MCSymbolRefExpr::VK_PPC_GOT_LO:
139 Type = ELF::R_PPC_GOT16_LO;
141 case MCSymbolRefExpr::VK_PPC_GOT_HI:
142 Type = ELF::R_PPC_GOT16_HI;
144 case MCSymbolRefExpr::VK_PPC_GOT_HA:
145 Type = ELF::R_PPC_GOT16_HA;
147 case MCSymbolRefExpr::VK_PPC_TOC:
148 Type = ELF::R_PPC64_TOC16;
150 case MCSymbolRefExpr::VK_PPC_TOC_LO:
151 Type = ELF::R_PPC64_TOC16_LO;
153 case MCSymbolRefExpr::VK_PPC_TOC_HI:
154 Type = ELF::R_PPC64_TOC16_HI;
156 case MCSymbolRefExpr::VK_PPC_TOC_HA:
157 Type = ELF::R_PPC64_TOC16_HA;
159 case MCSymbolRefExpr::VK_PPC_TPREL:
160 Type = ELF::R_PPC_TPREL16;
162 case MCSymbolRefExpr::VK_PPC_TPREL_LO:
163 Type = ELF::R_PPC_TPREL16_LO;
165 case MCSymbolRefExpr::VK_PPC_TPREL_HI:
166 Type = ELF::R_PPC_TPREL16_HI;
168 case MCSymbolRefExpr::VK_PPC_TPREL_HA:
169 Type = ELF::R_PPC_TPREL16_HA;
171 case MCSymbolRefExpr::VK_PPC_TPREL_HIGHER:
172 Type = ELF::R_PPC64_TPREL16_HIGHER;
174 case MCSymbolRefExpr::VK_PPC_TPREL_HIGHERA:
175 Type = ELF::R_PPC64_TPREL16_HIGHERA;
177 case MCSymbolRefExpr::VK_PPC_TPREL_HIGHEST:
178 Type = ELF::R_PPC64_TPREL16_HIGHEST;
180 case MCSymbolRefExpr::VK_PPC_TPREL_HIGHESTA:
181 Type = ELF::R_PPC64_TPREL16_HIGHESTA;
183 case MCSymbolRefExpr::VK_PPC_DTPREL:
184 Type = ELF::R_PPC64_DTPREL16;
186 case MCSymbolRefExpr::VK_PPC_DTPREL_LO:
187 Type = ELF::R_PPC64_DTPREL16_LO;
189 case MCSymbolRefExpr::VK_PPC_DTPREL_HI:
190 Type = ELF::R_PPC64_DTPREL16_HI;
192 case MCSymbolRefExpr::VK_PPC_DTPREL_HA:
193 Type = ELF::R_PPC64_DTPREL16_HA;
195 case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHER:
196 Type = ELF::R_PPC64_DTPREL16_HIGHER;
198 case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHERA:
199 Type = ELF::R_PPC64_DTPREL16_HIGHERA;
201 case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHEST:
202 Type = ELF::R_PPC64_DTPREL16_HIGHEST;
204 case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHESTA:
205 Type = ELF::R_PPC64_DTPREL16_HIGHESTA;
207 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD:
208 Type = ELF::R_PPC64_GOT_TLSGD16;
210 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO:
211 Type = ELF::R_PPC64_GOT_TLSGD16_LO;
213 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HI:
214 Type = ELF::R_PPC64_GOT_TLSGD16_HI;
216 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA:
217 Type = ELF::R_PPC64_GOT_TLSGD16_HA;
219 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD:
220 Type = ELF::R_PPC64_GOT_TLSLD16;
222 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO:
223 Type = ELF::R_PPC64_GOT_TLSLD16_LO;
225 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HI:
226 Type = ELF::R_PPC64_GOT_TLSLD16_HI;
228 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA:
229 Type = ELF::R_PPC64_GOT_TLSLD16_HA;
231 case MCSymbolRefExpr::VK_PPC_GOT_TPREL:
232 /* We don't have R_PPC64_GOT_TPREL16, but since GOT offsets
233 are always 4-aligned, we can use R_PPC64_GOT_TPREL16_DS. */
234 Type = ELF::R_PPC64_GOT_TPREL16_DS;
236 case MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO:
237 /* We don't have R_PPC64_GOT_TPREL16_LO, but since GOT offsets
238 are always 4-aligned, we can use R_PPC64_GOT_TPREL16_LO_DS. */
239 Type = ELF::R_PPC64_GOT_TPREL16_LO_DS;
241 case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HI:
242 Type = ELF::R_PPC64_GOT_TPREL16_HI;
244 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL:
245 /* We don't have R_PPC64_GOT_DTPREL16, but since GOT offsets
246 are always 4-aligned, we can use R_PPC64_GOT_DTPREL16_DS. */
247 Type = ELF::R_PPC64_GOT_DTPREL16_DS;
249 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_LO:
250 /* We don't have R_PPC64_GOT_DTPREL16_LO, but since GOT offsets
251 are always 4-aligned, we can use R_PPC64_GOT_DTPREL16_LO_DS. */
252 Type = ELF::R_PPC64_GOT_DTPREL16_LO_DS;
254 case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA:
255 Type = ELF::R_PPC64_GOT_TPREL16_HA;
257 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HI:
258 Type = ELF::R_PPC64_GOT_DTPREL16_HI;
260 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HA:
261 Type = ELF::R_PPC64_GOT_DTPREL16_HA;
265 case PPC::fixup_ppc_half16ds:
267 default: llvm_unreachable("Unsupported Modifier");
268 case MCSymbolRefExpr::VK_None:
269 Type = ELF::R_PPC64_ADDR16_DS;
271 case MCSymbolRefExpr::VK_PPC_LO:
272 Type = ELF::R_PPC64_ADDR16_LO_DS;
274 case MCSymbolRefExpr::VK_GOT:
275 Type = ELF::R_PPC64_GOT16_DS;
277 case MCSymbolRefExpr::VK_PPC_GOT_LO:
278 Type = ELF::R_PPC64_GOT16_LO_DS;
280 case MCSymbolRefExpr::VK_PPC_TOC:
281 Type = ELF::R_PPC64_TOC16_DS;
283 case MCSymbolRefExpr::VK_PPC_TOC_LO:
284 Type = ELF::R_PPC64_TOC16_LO_DS;
286 case MCSymbolRefExpr::VK_PPC_TPREL:
287 Type = ELF::R_PPC64_TPREL16_DS;
289 case MCSymbolRefExpr::VK_PPC_TPREL_LO:
290 Type = ELF::R_PPC64_TPREL16_LO_DS;
292 case MCSymbolRefExpr::VK_PPC_DTPREL:
293 Type = ELF::R_PPC64_DTPREL16_DS;
295 case MCSymbolRefExpr::VK_PPC_DTPREL_LO:
296 Type = ELF::R_PPC64_DTPREL16_LO_DS;
298 case MCSymbolRefExpr::VK_PPC_GOT_TPREL:
299 Type = ELF::R_PPC64_GOT_TPREL16_DS;
301 case MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO:
302 Type = ELF::R_PPC64_GOT_TPREL16_LO_DS;
304 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL:
305 Type = ELF::R_PPC64_GOT_DTPREL16_DS;
307 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_LO:
308 Type = ELF::R_PPC64_GOT_DTPREL16_LO_DS;
312 case PPC::fixup_ppc_nofixup:
314 default: llvm_unreachable("Unsupported Modifier");
315 case MCSymbolRefExpr::VK_TLSGD:
316 Type = ELF::R_PPC64_TLSGD;
318 case MCSymbolRefExpr::VK_TLSLD:
319 Type = ELF::R_PPC64_TLSLD;
321 case MCSymbolRefExpr::VK_PPC_TLS:
322 Type = ELF::R_PPC64_TLS;
328 default: llvm_unreachable("Unsupported Modifier");
329 case MCSymbolRefExpr::VK_PPC_TOCBASE:
330 Type = ELF::R_PPC64_TOC;
332 case MCSymbolRefExpr::VK_None:
333 Type = ELF::R_PPC64_ADDR64;
335 case MCSymbolRefExpr::VK_PPC_DTPMOD:
336 Type = ELF::R_PPC64_DTPMOD64;
338 case MCSymbolRefExpr::VK_PPC_TPREL:
339 Type = ELF::R_PPC64_TPREL64;
341 case MCSymbolRefExpr::VK_PPC_DTPREL:
342 Type = ELF::R_PPC64_DTPREL64;
347 Type = ELF::R_PPC_ADDR32;
350 Type = ELF::R_PPC_ADDR16;
357 unsigned PPCELFObjectWriter::GetRelocType(const MCValue &Target,
358 const MCFixup &Fixup,
360 bool IsRelocWithSymbol,
361 int64_t Addend) const {
362 return getRelocTypeInner(Target, Fixup, IsPCRel);
365 const MCSymbol *PPCELFObjectWriter::ExplicitRelSym(const MCAssembler &Asm,
366 const MCValue &Target,
368 const MCFixup &Fixup,
369 bool IsPCRel) const {
370 assert(Target.getSymA() && "SymA cannot be 0");
371 MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
372 MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
376 // GOT references always need a relocation, even if the
377 // target symbol is local.
378 case MCSymbolRefExpr::VK_GOT:
379 case MCSymbolRefExpr::VK_PPC_GOT_LO:
380 case MCSymbolRefExpr::VK_PPC_GOT_HI:
381 case MCSymbolRefExpr::VK_PPC_GOT_HA:
390 return &Target.getSymA()->getSymbol().AliasedSymbol();
394 const MCSymbol *PPCELFObjectWriter::undefinedExplicitRelSym(const MCValue &Target,
395 const MCFixup &Fixup,
396 bool IsPCRel) const {
397 assert(Target.getSymA() && "SymA cannot be 0");
398 const MCSymbol &Symbol = Target.getSymA()->getSymbol().AliasedSymbol();
400 unsigned RelocType = getRelocTypeInner(Target, Fixup, IsPCRel);
402 // The .odp creation emits a relocation against the symbol ".TOC." which
403 // create a R_PPC64_TOC relocation. However the relocation symbol name
404 // in final object creation should be NULL, since the symbol does not
405 // really exist, it is just the reference to TOC base for the current
407 bool EmitThisSym = RelocType != ELF::R_PPC64_TOC;
409 if (EmitThisSym && !Symbol.isTemporary())
414 MCObjectWriter *llvm::createPPCELFObjectWriter(raw_ostream &OS,
417 MCELFObjectTargetWriter *MOTW = new PPCELFObjectWriter(Is64Bit, OSABI);
418 return createELFObjectWriter(MOTW, OS, /*IsLittleEndian=*/false);