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_HI:
232 Type = ELF::R_PPC64_GOT_TPREL16_HI;
234 case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA:
235 Type = ELF::R_PPC64_GOT_TPREL16_HA;
237 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HI:
238 Type = ELF::R_PPC64_GOT_DTPREL16_HI;
240 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HA:
241 Type = ELF::R_PPC64_GOT_DTPREL16_HA;
245 case PPC::fixup_ppc_half16ds:
247 default: llvm_unreachable("Unsupported Modifier");
248 case MCSymbolRefExpr::VK_None:
249 Type = ELF::R_PPC64_ADDR16_DS;
251 case MCSymbolRefExpr::VK_PPC_LO:
252 Type = ELF::R_PPC64_ADDR16_LO_DS;
254 case MCSymbolRefExpr::VK_GOT:
255 Type = ELF::R_PPC64_GOT16_DS;
257 case MCSymbolRefExpr::VK_PPC_GOT_LO:
258 Type = ELF::R_PPC64_GOT16_LO_DS;
260 case MCSymbolRefExpr::VK_PPC_TOC:
261 Type = ELF::R_PPC64_TOC16_DS;
263 case MCSymbolRefExpr::VK_PPC_TOC_LO:
264 Type = ELF::R_PPC64_TOC16_LO_DS;
266 case MCSymbolRefExpr::VK_PPC_TPREL:
267 Type = ELF::R_PPC64_TPREL16_DS;
269 case MCSymbolRefExpr::VK_PPC_TPREL_LO:
270 Type = ELF::R_PPC64_TPREL16_LO_DS;
272 case MCSymbolRefExpr::VK_PPC_DTPREL:
273 Type = ELF::R_PPC64_DTPREL16_DS;
275 case MCSymbolRefExpr::VK_PPC_DTPREL_LO:
276 Type = ELF::R_PPC64_DTPREL16_LO_DS;
278 case MCSymbolRefExpr::VK_PPC_GOT_TPREL:
279 Type = ELF::R_PPC64_GOT_TPREL16_DS;
281 case MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO:
282 Type = ELF::R_PPC64_GOT_TPREL16_LO_DS;
284 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL:
285 Type = ELF::R_PPC64_GOT_DTPREL16_DS;
287 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_LO:
288 Type = ELF::R_PPC64_GOT_DTPREL16_LO_DS;
292 case PPC::fixup_ppc_tlsreg:
293 Type = ELF::R_PPC64_TLS;
295 case PPC::fixup_ppc_nofixup:
297 default: llvm_unreachable("Unsupported Modifier");
298 case MCSymbolRefExpr::VK_PPC_TLSGD:
299 Type = ELF::R_PPC64_TLSGD;
301 case MCSymbolRefExpr::VK_PPC_TLSLD:
302 Type = ELF::R_PPC64_TLSLD;
308 default: llvm_unreachable("Unsupported Modifier");
309 case MCSymbolRefExpr::VK_PPC_TOCBASE:
310 Type = ELF::R_PPC64_TOC;
312 case MCSymbolRefExpr::VK_None:
313 Type = ELF::R_PPC64_ADDR64;
318 Type = ELF::R_PPC_ADDR32;
321 Type = ELF::R_PPC_ADDR16;
328 unsigned PPCELFObjectWriter::GetRelocType(const MCValue &Target,
329 const MCFixup &Fixup,
331 bool IsRelocWithSymbol,
332 int64_t Addend) const {
333 return getRelocTypeInner(Target, Fixup, IsPCRel);
336 const MCSymbol *PPCELFObjectWriter::ExplicitRelSym(const MCAssembler &Asm,
337 const MCValue &Target,
339 const MCFixup &Fixup,
340 bool IsPCRel) const {
341 assert(Target.getSymA() && "SymA cannot be 0");
342 MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
343 MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
347 // GOT references always need a relocation, even if the
348 // target symbol is local.
349 case MCSymbolRefExpr::VK_GOT:
350 case MCSymbolRefExpr::VK_PPC_GOT_LO:
351 case MCSymbolRefExpr::VK_PPC_GOT_HI:
352 case MCSymbolRefExpr::VK_PPC_GOT_HA:
361 return &Target.getSymA()->getSymbol().AliasedSymbol();
365 const MCSymbol *PPCELFObjectWriter::undefinedExplicitRelSym(const MCValue &Target,
366 const MCFixup &Fixup,
367 bool IsPCRel) const {
368 assert(Target.getSymA() && "SymA cannot be 0");
369 const MCSymbol &Symbol = Target.getSymA()->getSymbol().AliasedSymbol();
371 unsigned RelocType = getRelocTypeInner(Target, Fixup, IsPCRel);
373 // The .odp creation emits a relocation against the symbol ".TOC." which
374 // create a R_PPC64_TOC relocation. However the relocation symbol name
375 // in final object creation should be NULL, since the symbol does not
376 // really exist, it is just the reference to TOC base for the current
378 bool EmitThisSym = RelocType != ELF::R_PPC64_TOC;
380 if (EmitThisSym && !Symbol.isTemporary())
385 MCObjectWriter *llvm::createPPCELFObjectWriter(raw_ostream &OS,
388 MCELFObjectTargetWriter *MOTW = new PPCELFObjectWriter(Is64Bit, OSABI);
389 return createELFObjectWriter(MOTW, OS, /*IsLittleEndian=*/false);