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 "MCTargetDesc/PPCMCExpr.h"
13 #include "llvm/ADT/STLExtras.h"
14 #include "llvm/MC/MCELFObjectWriter.h"
15 #include "llvm/MC/MCExpr.h"
16 #include "llvm/MC/MCSymbolELF.h"
17 #include "llvm/MC/MCValue.h"
18 #include "llvm/Support/ErrorHandling.h"
23 class PPCELFObjectWriter : public MCELFObjectTargetWriter {
25 PPCELFObjectWriter(bool Is64Bit, uint8_t OSABI);
28 unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
29 bool IsPCRel) const override;
31 bool needsRelocateWithSymbol(const MCSymbol &Sym,
32 unsigned Type) const override;
36 PPCELFObjectWriter::PPCELFObjectWriter(bool Is64Bit, uint8_t OSABI)
37 : MCELFObjectTargetWriter(Is64Bit, OSABI,
38 Is64Bit ? ELF::EM_PPC64 : ELF::EM_PPC,
39 /*HasRelocationAddend*/ true) {}
41 static MCSymbolRefExpr::VariantKind getAccessVariant(const MCValue &Target,
42 const MCFixup &Fixup) {
43 const MCExpr *Expr = Fixup.getValue();
45 if (Expr->getKind() != MCExpr::Target)
46 return Target.getAccessVariant();
48 switch (cast<PPCMCExpr>(Expr)->getKind()) {
49 case PPCMCExpr::VK_PPC_None:
50 return MCSymbolRefExpr::VK_None;
51 case PPCMCExpr::VK_PPC_LO:
52 return MCSymbolRefExpr::VK_PPC_LO;
53 case PPCMCExpr::VK_PPC_HI:
54 return MCSymbolRefExpr::VK_PPC_HI;
55 case PPCMCExpr::VK_PPC_HA:
56 return MCSymbolRefExpr::VK_PPC_HA;
57 case PPCMCExpr::VK_PPC_HIGHERA:
58 return MCSymbolRefExpr::VK_PPC_HIGHERA;
59 case PPCMCExpr::VK_PPC_HIGHER:
60 return MCSymbolRefExpr::VK_PPC_HIGHER;
61 case PPCMCExpr::VK_PPC_HIGHEST:
62 return MCSymbolRefExpr::VK_PPC_HIGHEST;
63 case PPCMCExpr::VK_PPC_HIGHESTA:
64 return MCSymbolRefExpr::VK_PPC_HIGHESTA;
66 llvm_unreachable("unknown PPCMCExpr kind");
69 unsigned PPCELFObjectWriter::GetRelocType(const MCValue &Target,
72 MCSymbolRefExpr::VariantKind Modifier = getAccessVariant(Target, Fixup);
74 // determine the type of the relocation
77 switch ((unsigned)Fixup.getKind()) {
79 llvm_unreachable("Unimplemented");
80 case PPC::fixup_ppc_br24:
81 case PPC::fixup_ppc_br24abs:
83 default: llvm_unreachable("Unsupported Modifier");
84 case MCSymbolRefExpr::VK_None:
85 Type = ELF::R_PPC_REL24;
87 case MCSymbolRefExpr::VK_PLT:
88 Type = ELF::R_PPC_PLTREL24;
90 case MCSymbolRefExpr::VK_PPC_LOCAL:
91 Type = ELF::R_PPC_LOCAL24PC;
95 case PPC::fixup_ppc_brcond14:
96 case PPC::fixup_ppc_brcond14abs:
97 Type = ELF::R_PPC_REL14;
99 case PPC::fixup_ppc_half16:
101 default: llvm_unreachable("Unsupported Modifier");
102 case MCSymbolRefExpr::VK_None:
103 Type = ELF::R_PPC_REL16;
105 case MCSymbolRefExpr::VK_PPC_LO:
106 Type = ELF::R_PPC_REL16_LO;
108 case MCSymbolRefExpr::VK_PPC_HI:
109 Type = ELF::R_PPC_REL16_HI;
111 case MCSymbolRefExpr::VK_PPC_HA:
112 Type = ELF::R_PPC_REL16_HA;
116 case PPC::fixup_ppc_half16ds: {
117 raw_ostream &OS = *(new raw_fd_ostream(2, false));
120 report_fatal_error("Invalid PC-relative half16ds relocation");
125 Type = ELF::R_PPC_REL32;
129 Type = ELF::R_PPC64_REL64;
133 switch ((unsigned)Fixup.getKind()) {
134 default: llvm_unreachable("invalid fixup kind!");
135 case PPC::fixup_ppc_br24abs:
136 Type = ELF::R_PPC_ADDR24;
138 case PPC::fixup_ppc_brcond14abs:
139 Type = ELF::R_PPC_ADDR14; // XXX: or BRNTAKEN?_
141 case PPC::fixup_ppc_half16:
143 default: llvm_unreachable("Unsupported Modifier");
144 case MCSymbolRefExpr::VK_None:
145 Type = ELF::R_PPC_ADDR16;
147 case MCSymbolRefExpr::VK_PPC_LO:
148 Type = ELF::R_PPC_ADDR16_LO;
150 case MCSymbolRefExpr::VK_PPC_HI:
151 Type = ELF::R_PPC_ADDR16_HI;
153 case MCSymbolRefExpr::VK_PPC_HA:
154 Type = ELF::R_PPC_ADDR16_HA;
156 case MCSymbolRefExpr::VK_PPC_HIGHER:
157 Type = ELF::R_PPC64_ADDR16_HIGHER;
159 case MCSymbolRefExpr::VK_PPC_HIGHERA:
160 Type = ELF::R_PPC64_ADDR16_HIGHERA;
162 case MCSymbolRefExpr::VK_PPC_HIGHEST:
163 Type = ELF::R_PPC64_ADDR16_HIGHEST;
165 case MCSymbolRefExpr::VK_PPC_HIGHESTA:
166 Type = ELF::R_PPC64_ADDR16_HIGHESTA;
168 case MCSymbolRefExpr::VK_GOT:
169 Type = ELF::R_PPC_GOT16;
171 case MCSymbolRefExpr::VK_PPC_GOT_LO:
172 Type = ELF::R_PPC_GOT16_LO;
174 case MCSymbolRefExpr::VK_PPC_GOT_HI:
175 Type = ELF::R_PPC_GOT16_HI;
177 case MCSymbolRefExpr::VK_PPC_GOT_HA:
178 Type = ELF::R_PPC_GOT16_HA;
180 case MCSymbolRefExpr::VK_PPC_TOC:
181 Type = ELF::R_PPC64_TOC16;
183 case MCSymbolRefExpr::VK_PPC_TOC_LO:
184 Type = ELF::R_PPC64_TOC16_LO;
186 case MCSymbolRefExpr::VK_PPC_TOC_HI:
187 Type = ELF::R_PPC64_TOC16_HI;
189 case MCSymbolRefExpr::VK_PPC_TOC_HA:
190 Type = ELF::R_PPC64_TOC16_HA;
192 case MCSymbolRefExpr::VK_PPC_TPREL:
193 Type = ELF::R_PPC_TPREL16;
195 case MCSymbolRefExpr::VK_PPC_TPREL_LO:
196 Type = ELF::R_PPC_TPREL16_LO;
198 case MCSymbolRefExpr::VK_PPC_TPREL_HI:
199 Type = ELF::R_PPC_TPREL16_HI;
201 case MCSymbolRefExpr::VK_PPC_TPREL_HA:
202 Type = ELF::R_PPC_TPREL16_HA;
204 case MCSymbolRefExpr::VK_PPC_TPREL_HIGHER:
205 Type = ELF::R_PPC64_TPREL16_HIGHER;
207 case MCSymbolRefExpr::VK_PPC_TPREL_HIGHERA:
208 Type = ELF::R_PPC64_TPREL16_HIGHERA;
210 case MCSymbolRefExpr::VK_PPC_TPREL_HIGHEST:
211 Type = ELF::R_PPC64_TPREL16_HIGHEST;
213 case MCSymbolRefExpr::VK_PPC_TPREL_HIGHESTA:
214 Type = ELF::R_PPC64_TPREL16_HIGHESTA;
216 case MCSymbolRefExpr::VK_PPC_DTPREL:
217 Type = ELF::R_PPC64_DTPREL16;
219 case MCSymbolRefExpr::VK_PPC_DTPREL_LO:
220 Type = ELF::R_PPC64_DTPREL16_LO;
222 case MCSymbolRefExpr::VK_PPC_DTPREL_HI:
223 Type = ELF::R_PPC64_DTPREL16_HI;
225 case MCSymbolRefExpr::VK_PPC_DTPREL_HA:
226 Type = ELF::R_PPC64_DTPREL16_HA;
228 case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHER:
229 Type = ELF::R_PPC64_DTPREL16_HIGHER;
231 case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHERA:
232 Type = ELF::R_PPC64_DTPREL16_HIGHERA;
234 case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHEST:
235 Type = ELF::R_PPC64_DTPREL16_HIGHEST;
237 case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHESTA:
238 Type = ELF::R_PPC64_DTPREL16_HIGHESTA;
240 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD:
242 Type = ELF::R_PPC64_GOT_TLSGD16;
244 Type = ELF::R_PPC_GOT_TLSGD16;
246 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO:
247 Type = ELF::R_PPC64_GOT_TLSGD16_LO;
249 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HI:
250 Type = ELF::R_PPC64_GOT_TLSGD16_HI;
252 case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA:
253 Type = ELF::R_PPC64_GOT_TLSGD16_HA;
255 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD:
257 Type = ELF::R_PPC64_GOT_TLSLD16;
259 Type = ELF::R_PPC_GOT_TLSLD16;
261 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO:
262 Type = ELF::R_PPC64_GOT_TLSLD16_LO;
264 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HI:
265 Type = ELF::R_PPC64_GOT_TLSLD16_HI;
267 case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA:
268 Type = ELF::R_PPC64_GOT_TLSLD16_HA;
270 case MCSymbolRefExpr::VK_PPC_GOT_TPREL:
271 /* We don't have R_PPC64_GOT_TPREL16, but since GOT offsets
272 are always 4-aligned, we can use R_PPC64_GOT_TPREL16_DS. */
273 Type = ELF::R_PPC64_GOT_TPREL16_DS;
275 case MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO:
276 /* We don't have R_PPC64_GOT_TPREL16_LO, but since GOT offsets
277 are always 4-aligned, we can use R_PPC64_GOT_TPREL16_LO_DS. */
278 Type = ELF::R_PPC64_GOT_TPREL16_LO_DS;
280 case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HI:
281 Type = ELF::R_PPC64_GOT_TPREL16_HI;
283 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL:
284 /* We don't have R_PPC64_GOT_DTPREL16, but since GOT offsets
285 are always 4-aligned, we can use R_PPC64_GOT_DTPREL16_DS. */
286 Type = ELF::R_PPC64_GOT_DTPREL16_DS;
288 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_LO:
289 /* We don't have R_PPC64_GOT_DTPREL16_LO, but since GOT offsets
290 are always 4-aligned, we can use R_PPC64_GOT_DTPREL16_LO_DS. */
291 Type = ELF::R_PPC64_GOT_DTPREL16_LO_DS;
293 case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA:
294 Type = ELF::R_PPC64_GOT_TPREL16_HA;
296 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HI:
297 Type = ELF::R_PPC64_GOT_DTPREL16_HI;
299 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HA:
300 Type = ELF::R_PPC64_GOT_DTPREL16_HA;
304 case PPC::fixup_ppc_half16ds:
306 default: llvm_unreachable("Unsupported Modifier");
307 case MCSymbolRefExpr::VK_None:
308 Type = ELF::R_PPC64_ADDR16_DS;
310 case MCSymbolRefExpr::VK_PPC_LO:
311 Type = ELF::R_PPC64_ADDR16_LO_DS;
313 case MCSymbolRefExpr::VK_GOT:
314 Type = ELF::R_PPC64_GOT16_DS;
316 case MCSymbolRefExpr::VK_PPC_GOT_LO:
317 Type = ELF::R_PPC64_GOT16_LO_DS;
319 case MCSymbolRefExpr::VK_PPC_TOC:
320 Type = ELF::R_PPC64_TOC16_DS;
322 case MCSymbolRefExpr::VK_PPC_TOC_LO:
323 Type = ELF::R_PPC64_TOC16_LO_DS;
325 case MCSymbolRefExpr::VK_PPC_TPREL:
326 Type = ELF::R_PPC64_TPREL16_DS;
328 case MCSymbolRefExpr::VK_PPC_TPREL_LO:
329 Type = ELF::R_PPC64_TPREL16_LO_DS;
331 case MCSymbolRefExpr::VK_PPC_DTPREL:
332 Type = ELF::R_PPC64_DTPREL16_DS;
334 case MCSymbolRefExpr::VK_PPC_DTPREL_LO:
335 Type = ELF::R_PPC64_DTPREL16_LO_DS;
337 case MCSymbolRefExpr::VK_PPC_GOT_TPREL:
338 Type = ELF::R_PPC64_GOT_TPREL16_DS;
340 case MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO:
341 Type = ELF::R_PPC64_GOT_TPREL16_LO_DS;
343 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL:
344 Type = ELF::R_PPC64_GOT_DTPREL16_DS;
346 case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_LO:
347 Type = ELF::R_PPC64_GOT_DTPREL16_LO_DS;
351 case PPC::fixup_ppc_nofixup:
353 default: llvm_unreachable("Unsupported Modifier");
354 case MCSymbolRefExpr::VK_PPC_TLSGD:
356 Type = ELF::R_PPC64_TLSGD;
358 Type = ELF::R_PPC_TLSGD;
360 case MCSymbolRefExpr::VK_PPC_TLSLD:
362 Type = ELF::R_PPC64_TLSLD;
364 Type = ELF::R_PPC_TLSLD;
366 case MCSymbolRefExpr::VK_PPC_TLS:
368 Type = ELF::R_PPC64_TLS;
370 Type = ELF::R_PPC_TLS;
376 default: llvm_unreachable("Unsupported Modifier");
377 case MCSymbolRefExpr::VK_PPC_TOCBASE:
378 Type = ELF::R_PPC64_TOC;
380 case MCSymbolRefExpr::VK_None:
381 Type = ELF::R_PPC64_ADDR64;
383 case MCSymbolRefExpr::VK_PPC_DTPMOD:
384 Type = ELF::R_PPC64_DTPMOD64;
386 case MCSymbolRefExpr::VK_PPC_TPREL:
387 Type = ELF::R_PPC64_TPREL64;
389 case MCSymbolRefExpr::VK_PPC_DTPREL:
390 Type = ELF::R_PPC64_DTPREL64;
395 Type = ELF::R_PPC_ADDR32;
398 Type = ELF::R_PPC_ADDR16;
405 bool PPCELFObjectWriter::needsRelocateWithSymbol(const MCSymbol &Sym,
406 unsigned Type) const {
411 case ELF::R_PPC_REL24:
412 // If the target symbol has a local entry point, we must keep the
413 // target symbol to preserve that information for the linker.
414 // The "other" values are stored in the last 6 bits of the second byte.
415 // The traditional defines for STO values assume the full byte and thus
416 // the shift to pack it.
417 unsigned Other = cast<MCSymbolELF>(Sym).getOther() << 2;
418 return (Other & ELF::STO_PPC64_LOCAL_MASK) != 0;
422 MCObjectWriter *llvm::createPPCELFObjectWriter(raw_pwrite_stream &OS,
426 MCELFObjectTargetWriter *MOTW = new PPCELFObjectWriter(Is64Bit, OSABI);
427 return createELFObjectWriter(MOTW, OS, IsLittleEndian);