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,
36 virtual void adjustFixupOffset(const MCFixup &Fixup, uint64_t &RelocOffset);
38 virtual void sortRelocs(const MCAssembler &Asm,
39 std::vector<ELFRelocationEntry> &Relocs);
42 class PPCELFRelocationEntry : public ELFRelocationEntry {
44 PPCELFRelocationEntry(const ELFRelocationEntry &RE);
45 bool operator<(const PPCELFRelocationEntry &RE) const {
46 return (RE.r_offset < r_offset ||
47 (RE.r_offset == r_offset && RE.Type > Type));
52 PPCELFRelocationEntry::PPCELFRelocationEntry(const ELFRelocationEntry &RE)
53 : ELFRelocationEntry(RE.r_offset, RE.Index, RE.Type, RE.Symbol,
54 RE.r_addend, *RE.Fixup) {}
56 PPCELFObjectWriter::PPCELFObjectWriter(bool Is64Bit, uint8_t OSABI)
57 : MCELFObjectTargetWriter(Is64Bit, OSABI,
58 Is64Bit ? ELF::EM_PPC64 : ELF::EM_PPC,
59 /*HasRelocationAddend*/ true) {}
61 PPCELFObjectWriter::~PPCELFObjectWriter() {
64 unsigned PPCELFObjectWriter::getRelocTypeInner(const MCValue &Target,
68 MCSymbolRefExpr::VariantKind Modifier = Target.isAbsolute() ?
69 MCSymbolRefExpr::VK_None : Target.getSymA()->getKind();
71 // determine the type of the relocation
74 switch ((unsigned)Fixup.getKind()) {
76 llvm_unreachable("Unimplemented");
77 case PPC::fixup_ppc_br24:
78 Type = ELF::R_PPC_REL24;
80 case PPC::fixup_ppc_brcond14:
81 Type = ELF::R_PPC_REL14;
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_ha16:
103 default: llvm_unreachable("Unsupported Modifier");
104 case MCSymbolRefExpr::VK_PPC_TPREL16_HA:
105 Type = ELF::R_PPC_TPREL16_HA;
107 case MCSymbolRefExpr::VK_PPC_DTPREL16_HA:
108 Type = ELF::R_PPC64_DTPREL16_HA;
110 case MCSymbolRefExpr::VK_PPC_GAS_HA16:
111 case MCSymbolRefExpr::VK_PPC_DARWIN_HA16:
112 Type = ELF::R_PPC_ADDR16_HA;
114 case MCSymbolRefExpr::VK_PPC_TOC16_HA:
115 Type = ELF::R_PPC64_TOC16_HA;
117 case MCSymbolRefExpr::VK_PPC_GOT_TPREL16_HA:
118 Type = ELF::R_PPC64_GOT_TPREL16_HA;
120 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD16_HA:
121 Type = ELF::R_PPC64_GOT_TLSGD16_HA;
123 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD16_HA:
124 Type = ELF::R_PPC64_GOT_TLSLD16_HA;
128 case PPC::fixup_ppc_lo16:
130 default: llvm_unreachable("Unsupported Modifier");
131 case MCSymbolRefExpr::VK_PPC_TPREL16_LO:
132 Type = ELF::R_PPC_TPREL16_LO;
134 case MCSymbolRefExpr::VK_PPC_DTPREL16_LO:
135 Type = ELF::R_PPC64_DTPREL16_LO;
137 case MCSymbolRefExpr::VK_None:
138 Type = ELF::R_PPC_ADDR16;
140 case MCSymbolRefExpr::VK_PPC_GAS_LO16:
141 case MCSymbolRefExpr::VK_PPC_DARWIN_LO16:
142 Type = ELF::R_PPC_ADDR16_LO;
144 case MCSymbolRefExpr::VK_PPC_TOC_ENTRY:
145 Type = ELF::R_PPC64_TOC16;
147 case MCSymbolRefExpr::VK_PPC_TOC16_LO:
148 Type = ELF::R_PPC64_TOC16_LO;
150 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD16_LO:
151 Type = ELF::R_PPC64_GOT_TLSGD16_LO;
153 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD16_LO:
154 Type = ELF::R_PPC64_GOT_TLSLD16_LO;
158 case PPC::fixup_ppc_lo16_ds:
160 default: llvm_unreachable("Unsupported Modifier");
161 case MCSymbolRefExpr::VK_None:
162 Type = ELF::R_PPC64_ADDR16_DS;
164 case MCSymbolRefExpr::VK_PPC_GAS_LO16:
165 case MCSymbolRefExpr::VK_PPC_DARWIN_LO16:
166 Type = ELF::R_PPC64_ADDR16_LO_DS;
168 case MCSymbolRefExpr::VK_PPC_TOC_ENTRY:
169 Type = ELF::R_PPC64_TOC16_DS;
171 case MCSymbolRefExpr::VK_PPC_TOC16_LO:
172 Type = ELF::R_PPC64_TOC16_LO_DS;
174 case MCSymbolRefExpr::VK_PPC_GOT_TPREL16_LO:
175 Type = ELF::R_PPC64_GOT_TPREL16_LO_DS;
179 case PPC::fixup_ppc_tlsreg:
180 Type = ELF::R_PPC64_TLS;
182 case PPC::fixup_ppc_nofixup:
184 default: llvm_unreachable("Unsupported Modifier");
185 case MCSymbolRefExpr::VK_PPC_TLSGD:
186 Type = ELF::R_PPC64_TLSGD;
188 case MCSymbolRefExpr::VK_PPC_TLSLD:
189 Type = ELF::R_PPC64_TLSLD;
195 default: llvm_unreachable("Unsupported Modifier");
196 case MCSymbolRefExpr::VK_PPC_TOC:
197 Type = ELF::R_PPC64_TOC;
199 case MCSymbolRefExpr::VK_None:
200 Type = ELF::R_PPC64_ADDR64;
205 Type = ELF::R_PPC_ADDR32;
208 Type = ELF::R_PPC_ADDR16;
215 unsigned PPCELFObjectWriter::GetRelocType(const MCValue &Target,
216 const MCFixup &Fixup,
218 bool IsRelocWithSymbol,
219 int64_t Addend) const {
220 return getRelocTypeInner(Target, Fixup, IsPCRel);
223 const MCSymbol *PPCELFObjectWriter::undefinedExplicitRelSym(const MCValue &Target,
224 const MCFixup &Fixup,
225 bool IsPCRel) const {
226 assert(Target.getSymA() && "SymA cannot be 0");
227 const MCSymbol &Symbol = Target.getSymA()->getSymbol().AliasedSymbol();
229 unsigned RelocType = getRelocTypeInner(Target, Fixup, IsPCRel);
231 // The .odp creation emits a relocation against the symbol ".TOC." which
232 // create a R_PPC64_TOC relocation. However the relocation symbol name
233 // in final object creation should be NULL, since the symbol does not
234 // really exist, it is just the reference to TOC base for the current
236 bool EmitThisSym = RelocType != ELF::R_PPC64_TOC;
238 if (EmitThisSym && !Symbol.isTemporary())
243 void PPCELFObjectWriter::
244 adjustFixupOffset(const MCFixup &Fixup, uint64_t &RelocOffset) {
245 switch ((unsigned)Fixup.getKind()) {
246 case PPC::fixup_ppc_ha16:
247 case PPC::fixup_ppc_lo16:
248 case PPC::fixup_ppc_lo16_ds:
256 // The standard sorter only sorts on the r_offset field, but PowerPC can
257 // have multiple relocations at the same offset. Sort secondarily on the
258 // relocation type to avoid nondeterminism.
259 void PPCELFObjectWriter::sortRelocs(const MCAssembler &Asm,
260 std::vector<ELFRelocationEntry> &Relocs) {
262 // Copy to a temporary vector of relocation entries having a different
264 std::vector<PPCELFRelocationEntry> TmpRelocs;
266 for (std::vector<ELFRelocationEntry>::iterator R = Relocs.begin();
267 R != Relocs.end(); ++R) {
268 TmpRelocs.push_back(PPCELFRelocationEntry(*R));
271 // Sort in place by ascending r_offset and descending r_type.
272 array_pod_sort(TmpRelocs.begin(), TmpRelocs.end());
274 // Copy back to the original vector.
276 for (std::vector<PPCELFRelocationEntry>::iterator R = TmpRelocs.begin();
277 R != TmpRelocs.end(); ++R, ++I) {
278 Relocs[I] = ELFRelocationEntry(R->r_offset, R->Index, R->Type,
279 R->Symbol, R->r_addend, *R->Fixup);
284 MCObjectWriter *llvm::createPPCELFObjectWriter(raw_ostream &OS,
287 MCELFObjectTargetWriter *MOTW = new PPCELFObjectWriter(Is64Bit, OSABI);
288 return createELFObjectWriter(MOTW, OS, /*IsLittleEndian=*/false);