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 *undefinedExplicitRelSym(const MCValue &Target,
39 PPCELFObjectWriter::PPCELFObjectWriter(bool Is64Bit, uint8_t OSABI)
40 : MCELFObjectTargetWriter(Is64Bit, OSABI,
41 Is64Bit ? ELF::EM_PPC64 : ELF::EM_PPC,
42 /*HasRelocationAddend*/ true) {}
44 PPCELFObjectWriter::~PPCELFObjectWriter() {
47 unsigned PPCELFObjectWriter::getRelocTypeInner(const MCValue &Target,
51 MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
52 MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
54 // determine the type of the relocation
57 switch ((unsigned)Fixup.getKind()) {
59 llvm_unreachable("Unimplemented");
60 case PPC::fixup_ppc_br24:
61 Type = ELF::R_PPC_REL24;
63 case PPC::fixup_ppc_brcond14:
64 Type = ELF::R_PPC_REL14;
66 case PPC::fixup_ppc_half16:
68 default: llvm_unreachable("Unsupported Modifier");
69 case MCSymbolRefExpr::VK_None:
70 Type = ELF::R_PPC_REL16;
72 case MCSymbolRefExpr::VK_PPC_LO:
73 Type = ELF::R_PPC_REL16_LO;
75 case MCSymbolRefExpr::VK_PPC_HI:
76 Type = ELF::R_PPC_REL16_HI;
78 case MCSymbolRefExpr::VK_PPC_HA:
79 Type = ELF::R_PPC_REL16_HA;
85 Type = ELF::R_PPC_REL32;
89 Type = ELF::R_PPC64_REL64;
93 switch ((unsigned)Fixup.getKind()) {
94 default: llvm_unreachable("invalid fixup kind!");
95 case PPC::fixup_ppc_br24:
96 Type = ELF::R_PPC_ADDR24;
98 case PPC::fixup_ppc_brcond14:
99 Type = ELF::R_PPC_ADDR14; // XXX: or BRNTAKEN?_
101 case PPC::fixup_ppc_half16:
103 default: llvm_unreachable("Unsupported Modifier");
104 case MCSymbolRefExpr::VK_None:
105 Type = ELF::R_PPC_ADDR16;
107 case MCSymbolRefExpr::VK_PPC_LO:
108 Type = ELF::R_PPC_ADDR16_LO;
110 case MCSymbolRefExpr::VK_PPC_HI:
111 Type = ELF::R_PPC_ADDR16_HI;
113 case MCSymbolRefExpr::VK_PPC_HA:
114 Type = ELF::R_PPC_ADDR16_HA;
116 case MCSymbolRefExpr::VK_PPC_HIGHER:
117 Type = ELF::R_PPC64_ADDR16_HIGHER;
119 case MCSymbolRefExpr::VK_PPC_HIGHERA:
120 Type = ELF::R_PPC64_ADDR16_HIGHERA;
122 case MCSymbolRefExpr::VK_PPC_HIGHEST:
123 Type = ELF::R_PPC64_ADDR16_HIGHEST;
125 case MCSymbolRefExpr::VK_PPC_HIGHESTA:
126 Type = ELF::R_PPC64_ADDR16_HIGHESTA;
128 case MCSymbolRefExpr::VK_PPC_TOC:
129 Type = ELF::R_PPC64_TOC16;
131 case MCSymbolRefExpr::VK_PPC_TOC_LO:
132 Type = ELF::R_PPC64_TOC16_LO;
134 case MCSymbolRefExpr::VK_PPC_TOC_HI:
135 Type = ELF::R_PPC64_TOC16_HI;
137 case MCSymbolRefExpr::VK_PPC_TOC_HA:
138 Type = ELF::R_PPC64_TOC16_HA;
140 case MCSymbolRefExpr::VK_PPC_TPREL:
141 Type = ELF::R_PPC_TPREL16;
143 case MCSymbolRefExpr::VK_PPC_TPREL_LO:
144 Type = ELF::R_PPC_TPREL16_LO;
146 case MCSymbolRefExpr::VK_PPC_TPREL_HI:
147 Type = ELF::R_PPC_TPREL16_HI;
149 case MCSymbolRefExpr::VK_PPC_TPREL_HA:
150 Type = ELF::R_PPC_TPREL16_HA;
152 case MCSymbolRefExpr::VK_PPC_TPREL_HIGHER:
153 Type = ELF::R_PPC64_TPREL16_HIGHER;
155 case MCSymbolRefExpr::VK_PPC_TPREL_HIGHERA:
156 Type = ELF::R_PPC64_TPREL16_HIGHERA;
158 case MCSymbolRefExpr::VK_PPC_TPREL_HIGHEST:
159 Type = ELF::R_PPC64_TPREL16_HIGHEST;
161 case MCSymbolRefExpr::VK_PPC_TPREL_HIGHESTA:
162 Type = ELF::R_PPC64_TPREL16_HIGHESTA;
164 case MCSymbolRefExpr::VK_PPC_DTPREL:
165 Type = ELF::R_PPC64_DTPREL16;
167 case MCSymbolRefExpr::VK_PPC_DTPREL_LO:
168 Type = ELF::R_PPC64_DTPREL16_LO;
170 case MCSymbolRefExpr::VK_PPC_DTPREL_HI:
171 Type = ELF::R_PPC64_DTPREL16_HI;
173 case MCSymbolRefExpr::VK_PPC_DTPREL_HA:
174 Type = ELF::R_PPC64_DTPREL16_HA;
176 case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHER:
177 Type = ELF::R_PPC64_DTPREL16_HIGHER;
179 case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHERA:
180 Type = ELF::R_PPC64_DTPREL16_HIGHERA;
182 case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHEST:
183 Type = ELF::R_PPC64_DTPREL16_HIGHEST;
185 case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHESTA:
186 Type = ELF::R_PPC64_DTPREL16_HIGHESTA;
188 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD:
189 Type = ELF::R_PPC64_GOT_TLSGD16;
191 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO:
192 Type = ELF::R_PPC64_GOT_TLSGD16_LO;
194 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HI:
195 Type = ELF::R_PPC64_GOT_TLSGD16_HI;
197 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA:
198 Type = ELF::R_PPC64_GOT_TLSGD16_HA;
200 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD:
201 Type = ELF::R_PPC64_GOT_TLSLD16;
203 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO:
204 Type = ELF::R_PPC64_GOT_TLSLD16_LO;
206 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HI:
207 Type = ELF::R_PPC64_GOT_TLSLD16_HI;
209 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA:
210 Type = ELF::R_PPC64_GOT_TLSLD16_HA;
212 case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HI:
213 Type = ELF::R_PPC64_GOT_TPREL16_HI;
215 case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA:
216 Type = ELF::R_PPC64_GOT_TPREL16_HA;
218 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HI:
219 Type = ELF::R_PPC64_GOT_DTPREL16_HI;
221 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HA:
222 Type = ELF::R_PPC64_GOT_DTPREL16_HA;
226 case PPC::fixup_ppc_half16ds:
228 default: llvm_unreachable("Unsupported Modifier");
229 case MCSymbolRefExpr::VK_None:
230 Type = ELF::R_PPC64_ADDR16_DS;
232 case MCSymbolRefExpr::VK_PPC_LO:
233 Type = ELF::R_PPC64_ADDR16_LO_DS;
235 case MCSymbolRefExpr::VK_PPC_TOC:
236 Type = ELF::R_PPC64_TOC16_DS;
238 case MCSymbolRefExpr::VK_PPC_TOC_LO:
239 Type = ELF::R_PPC64_TOC16_LO_DS;
241 case MCSymbolRefExpr::VK_PPC_TPREL:
242 Type = ELF::R_PPC64_TPREL16_DS;
244 case MCSymbolRefExpr::VK_PPC_TPREL_LO:
245 Type = ELF::R_PPC64_TPREL16_LO_DS;
247 case MCSymbolRefExpr::VK_PPC_DTPREL:
248 Type = ELF::R_PPC64_DTPREL16_DS;
250 case MCSymbolRefExpr::VK_PPC_DTPREL_LO:
251 Type = ELF::R_PPC64_DTPREL16_LO_DS;
253 case MCSymbolRefExpr::VK_PPC_GOT_TPREL:
254 Type = ELF::R_PPC64_GOT_TPREL16_DS;
256 case MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO:
257 Type = ELF::R_PPC64_GOT_TPREL16_LO_DS;
259 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL:
260 Type = ELF::R_PPC64_GOT_DTPREL16_DS;
262 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_LO:
263 Type = ELF::R_PPC64_GOT_DTPREL16_LO_DS;
267 case PPC::fixup_ppc_tlsreg:
268 Type = ELF::R_PPC64_TLS;
270 case PPC::fixup_ppc_nofixup:
272 default: llvm_unreachable("Unsupported Modifier");
273 case MCSymbolRefExpr::VK_PPC_TLSGD:
274 Type = ELF::R_PPC64_TLSGD;
276 case MCSymbolRefExpr::VK_PPC_TLSLD:
277 Type = ELF::R_PPC64_TLSLD;
283 default: llvm_unreachable("Unsupported Modifier");
284 case MCSymbolRefExpr::VK_PPC_TOCBASE:
285 Type = ELF::R_PPC64_TOC;
287 case MCSymbolRefExpr::VK_None:
288 Type = ELF::R_PPC64_ADDR64;
293 Type = ELF::R_PPC_ADDR32;
296 Type = ELF::R_PPC_ADDR16;
303 unsigned PPCELFObjectWriter::GetRelocType(const MCValue &Target,
304 const MCFixup &Fixup,
306 bool IsRelocWithSymbol,
307 int64_t Addend) const {
308 return getRelocTypeInner(Target, Fixup, IsPCRel);
311 const MCSymbol *PPCELFObjectWriter::undefinedExplicitRelSym(const MCValue &Target,
312 const MCFixup &Fixup,
313 bool IsPCRel) const {
314 assert(Target.getSymA() && "SymA cannot be 0");
315 const MCSymbol &Symbol = Target.getSymA()->getSymbol().AliasedSymbol();
317 unsigned RelocType = getRelocTypeInner(Target, Fixup, IsPCRel);
319 // The .odp creation emits a relocation against the symbol ".TOC." which
320 // create a R_PPC64_TOC relocation. However the relocation symbol name
321 // in final object creation should be NULL, since the symbol does not
322 // really exist, it is just the reference to TOC base for the current
324 bool EmitThisSym = RelocType != ELF::R_PPC64_TOC;
326 if (EmitThisSym && !Symbol.isTemporary())
331 MCObjectWriter *llvm::createPPCELFObjectWriter(raw_ostream &OS,
334 MCELFObjectTargetWriter *MOTW = new PPCELFObjectWriter(Is64Bit, OSABI);
335 return createELFObjectWriter(MOTW, OS, /*IsLittleEndian=*/false);