contrib/llvm/lib/Target/AArch64/MCTargetDesc/AArch64ELFObjectWriter.cpp

   1 //===-- AArch64ELFObjectWriter.cpp - AArch64 ELF Writer -------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file handles ELF-specific object emission, converting LLVM's internal
  11 // fixups into the appropriate relocations.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "MCTargetDesc/AArch64FixupKinds.h"
  16 #include "MCTargetDesc/AArch64MCTargetDesc.h"
  17 #include "llvm/MC/MCELFObjectWriter.h"
  18 #include "llvm/MC/MCValue.h"
  19 #include "llvm/Support/ErrorHandling.h"
  20
  21 using namespace llvm;
  22
  23 namespace {
  24 class AArch64ELFObjectWriter : public MCELFObjectTargetWriter {
  25 public:
  26   AArch64ELFObjectWriter(uint8_t OSABI);
  27
  28   virtual ~AArch64ELFObjectWriter();
  29
  30 protected:
  31   virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
  32                                 bool IsPCRel, bool IsRelocWithSymbol,
  33                                 int64_t Addend) const;
  34 private:
  35 };
  36 }
  37
  38 AArch64ELFObjectWriter::AArch64ELFObjectWriter(uint8_t OSABI)
  39   : MCELFObjectTargetWriter(/*Is64Bit*/ true, OSABI, ELF::EM_AARCH64,
  40                             /*HasRelocationAddend*/ true)
  41 {}
  42
  43 AArch64ELFObjectWriter::~AArch64ELFObjectWriter()
  44 {}
  45
  46 unsigned AArch64ELFObjectWriter::GetRelocType(const MCValue &Target,
  47                                               const MCFixup &Fixup,
  48                                               bool IsPCRel,
  49                                               bool IsRelocWithSymbol,
  50                                               int64_t Addend) const {
  51   unsigned Type;
  52   if (IsPCRel) {
  53     switch ((unsigned)Fixup.getKind()) {
  54     default:
  55       llvm_unreachable("Unimplemented fixup -> relocation");
  56     case FK_Data_8:
  57       return ELF::R_AARCH64_PREL64;
  58     case FK_Data_4:
  59       return ELF::R_AARCH64_PREL32;
  60     case FK_Data_2:
  61       return ELF::R_AARCH64_PREL16;
  62     case AArch64::fixup_a64_ld_prel:
  63       Type = ELF::R_AARCH64_LD_PREL_LO19;
  64       break;
  65     case AArch64::fixup_a64_adr_prel:
  66       Type = ELF::R_AARCH64_ADR_PREL_LO21;
  67       break;
  68     case AArch64::fixup_a64_adr_prel_page:
  69       Type = ELF::R_AARCH64_ADR_PREL_PG_HI21;
  70       break;
  71     case AArch64::fixup_a64_adr_prel_got_page:
  72       Type = ELF::R_AARCH64_ADR_GOT_PAGE;
  73       break;
  74     case AArch64::fixup_a64_tstbr:
  75       Type = ELF::R_AARCH64_TSTBR14;
  76       break;
  77     case AArch64::fixup_a64_condbr:
  78       Type = ELF::R_AARCH64_CONDBR19;
  79       break;
  80     case AArch64::fixup_a64_uncondbr:
  81       Type = ELF::R_AARCH64_JUMP26;
  82       break;
  83     case AArch64::fixup_a64_call:
  84       Type = ELF::R_AARCH64_CALL26;
  85       break;
  86     case AArch64::fixup_a64_adr_gottprel_page:
  87       Type = ELF::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21;
  88       break;
  89     case AArch64::fixup_a64_ld_gottprel_prel19:
  90       Type =  ELF::R_AARCH64_TLSIE_LD_GOTTPREL_PREL19;
  91       break;
  92     case AArch64::fixup_a64_tlsdesc_adr_page:
  93       Type = ELF::R_AARCH64_TLSDESC_ADR_PAGE;
  94       break;
  95     }
  96   } else {
  97     switch ((unsigned)Fixup.getKind()) {
  98     default:
  99       llvm_unreachable("Unimplemented fixup -> relocation");
 100     case FK_Data_8:
 101       return ELF::R_AARCH64_ABS64;
 102     case FK_Data_4:
 103       return ELF::R_AARCH64_ABS32;
 104     case FK_Data_2:
 105       return ELF::R_AARCH64_ABS16;
 106     case AArch64::fixup_a64_add_lo12:
 107       Type = ELF::R_AARCH64_ADD_ABS_LO12_NC;
 108       break;
 109     case AArch64::fixup_a64_ld64_got_lo12_nc:
 110       Type = ELF::R_AARCH64_LD64_GOT_LO12_NC;
 111       break;
 112     case AArch64::fixup_a64_ldst8_lo12:
 113       Type = ELF::R_AARCH64_LDST8_ABS_LO12_NC;
 114       break;
 115     case AArch64::fixup_a64_ldst16_lo12:
 116       Type = ELF::R_AARCH64_LDST16_ABS_LO12_NC;
 117       break;
 118     case AArch64::fixup_a64_ldst32_lo12:
 119       Type = ELF::R_AARCH64_LDST32_ABS_LO12_NC;
 120       break;
 121     case AArch64::fixup_a64_ldst64_lo12:
 122       Type = ELF::R_AARCH64_LDST64_ABS_LO12_NC;
 123       break;
 124     case AArch64::fixup_a64_ldst128_lo12:
 125       Type = ELF::R_AARCH64_LDST128_ABS_LO12_NC;
 126       break;
 127     case AArch64::fixup_a64_movw_uabs_g0:
 128       Type = ELF::R_AARCH64_MOVW_UABS_G0;
 129       break;
 130     case AArch64::fixup_a64_movw_uabs_g0_nc:
 131       Type = ELF::R_AARCH64_MOVW_UABS_G0_NC;
 132       break;
 133     case AArch64::fixup_a64_movw_uabs_g1:
 134       Type = ELF::R_AARCH64_MOVW_UABS_G1;
 135       break;
 136     case AArch64::fixup_a64_movw_uabs_g1_nc:
 137       Type = ELF::R_AARCH64_MOVW_UABS_G1_NC;
 138       break;
 139     case AArch64::fixup_a64_movw_uabs_g2:
 140       Type = ELF::R_AARCH64_MOVW_UABS_G2;
 141       break;
 142     case AArch64::fixup_a64_movw_uabs_g2_nc:
 143       Type = ELF::R_AARCH64_MOVW_UABS_G2_NC;
 144       break;
 145     case AArch64::fixup_a64_movw_uabs_g3:
 146       Type = ELF::R_AARCH64_MOVW_UABS_G3;
 147       break;
 148     case AArch64::fixup_a64_movw_sabs_g0:
 149       Type = ELF::R_AARCH64_MOVW_SABS_G0;
 150       break;
 151     case AArch64::fixup_a64_movw_sabs_g1:
 152       Type = ELF::R_AARCH64_MOVW_SABS_G1;
 153       break;
 154     case AArch64::fixup_a64_movw_sabs_g2:
 155       Type = ELF::R_AARCH64_MOVW_SABS_G2;
 156       break;
 157
 158     // TLS Local-dynamic block
 159     case AArch64::fixup_a64_movw_dtprel_g2:
 160       Type = ELF::R_AARCH64_TLSLD_MOVW_DTPREL_G2;
 161       break;
 162     case AArch64::fixup_a64_movw_dtprel_g1:
 163       Type = ELF::R_AARCH64_TLSLD_MOVW_DTPREL_G1;
 164       break;
 165     case AArch64::fixup_a64_movw_dtprel_g1_nc:
 166       Type = ELF::R_AARCH64_TLSLD_MOVW_DTPREL_G1_NC;
 167       break;
 168     case AArch64::fixup_a64_movw_dtprel_g0:
 169       Type = ELF::R_AARCH64_TLSLD_MOVW_DTPREL_G0;
 170       break;
 171     case AArch64::fixup_a64_movw_dtprel_g0_nc:
 172       Type = ELF::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC;
 173       break;
 174     case AArch64::fixup_a64_add_dtprel_hi12:
 175       Type = ELF::R_AARCH64_TLSLD_ADD_DTPREL_HI12;
 176       break;
 177     case AArch64::fixup_a64_add_dtprel_lo12:
 178       Type = ELF::R_AARCH64_TLSLD_ADD_DTPREL_LO12;
 179       break;
 180     case AArch64::fixup_a64_add_dtprel_lo12_nc:
 181       Type = ELF::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC;
 182       break;
 183     case AArch64::fixup_a64_ldst8_dtprel_lo12:
 184       Type = ELF::R_AARCH64_TLSLD_LDST8_DTPREL_LO12;
 185       break;
 186     case AArch64::fixup_a64_ldst8_dtprel_lo12_nc:
 187       Type = ELF::R_AARCH64_TLSLD_LDST8_DTPREL_LO12_NC;
 188       break;
 189     case AArch64::fixup_a64_ldst16_dtprel_lo12:
 190       Type = ELF::R_AARCH64_TLSLD_LDST16_DTPREL_LO12;
 191       break;
 192     case AArch64::fixup_a64_ldst16_dtprel_lo12_nc:
 193       Type = ELF::R_AARCH64_TLSLD_LDST16_DTPREL_LO12_NC;
 194       break;
 195     case AArch64::fixup_a64_ldst32_dtprel_lo12:
 196       Type = ELF::R_AARCH64_TLSLD_LDST32_DTPREL_LO12;
 197       break;
 198     case AArch64::fixup_a64_ldst32_dtprel_lo12_nc:
 199       Type = ELF::R_AARCH64_TLSLD_LDST32_DTPREL_LO12_NC;
 200       break;
 201     case AArch64::fixup_a64_ldst64_dtprel_lo12:
 202       Type = ELF::R_AARCH64_TLSLD_LDST64_DTPREL_LO12;
 203       break;
 204     case AArch64::fixup_a64_ldst64_dtprel_lo12_nc:
 205       Type = ELF::R_AARCH64_TLSLD_LDST64_DTPREL_LO12_NC;
 206       break;
 207
 208     // TLS initial-exec block
 209     case AArch64::fixup_a64_movw_gottprel_g1:
 210       Type = ELF::R_AARCH64_TLSIE_MOVW_GOTTPREL_G1;
 211       break;
 212     case AArch64::fixup_a64_movw_gottprel_g0_nc:
 213       Type = ELF::R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC;
 214       break;
 215     case AArch64::fixup_a64_ld64_gottprel_lo12_nc:
 216       Type = ELF::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC;
 217       break;
 218
 219     // TLS local-exec block
 220     case AArch64::fixup_a64_movw_tprel_g2:
 221       Type = ELF::R_AARCH64_TLSLE_MOVW_TPREL_G2;
 222       break;
 223     case AArch64::fixup_a64_movw_tprel_g1:
 224       Type = ELF::R_AARCH64_TLSLE_MOVW_TPREL_G1;
 225       break;
 226     case AArch64::fixup_a64_movw_tprel_g1_nc:
 227       Type = ELF::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC;
 228       break;
 229     case AArch64::fixup_a64_movw_tprel_g0:
 230       Type = ELF::R_AARCH64_TLSLE_MOVW_TPREL_G0;
 231       break;
 232     case AArch64::fixup_a64_movw_tprel_g0_nc:
 233       Type = ELF::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC;
 234       break;
 235     case AArch64::fixup_a64_add_tprel_hi12:
 236       Type = ELF::R_AARCH64_TLSLE_ADD_TPREL_HI12;
 237       break;
 238     case AArch64::fixup_a64_add_tprel_lo12:
 239       Type = ELF::R_AARCH64_TLSLE_ADD_TPREL_LO12;
 240       break;
 241     case AArch64::fixup_a64_add_tprel_lo12_nc:
 242       Type = ELF::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC;
 243       break;
 244     case AArch64::fixup_a64_ldst8_tprel_lo12:
 245       Type = ELF::R_AARCH64_TLSLE_LDST8_TPREL_LO12;
 246       break;
 247     case AArch64::fixup_a64_ldst8_tprel_lo12_nc:
 248       Type = ELF::R_AARCH64_TLSLE_LDST8_TPREL_LO12_NC;
 249       break;
 250     case AArch64::fixup_a64_ldst16_tprel_lo12:
 251       Type = ELF::R_AARCH64_TLSLE_LDST16_TPREL_LO12;
 252       break;
 253     case AArch64::fixup_a64_ldst16_tprel_lo12_nc:
 254       Type = ELF::R_AARCH64_TLSLE_LDST16_TPREL_LO12_NC;
 255       break;
 256     case AArch64::fixup_a64_ldst32_tprel_lo12:
 257       Type = ELF::R_AARCH64_TLSLE_LDST32_TPREL_LO12;
 258       break;
 259     case AArch64::fixup_a64_ldst32_tprel_lo12_nc:
 260       Type = ELF::R_AARCH64_TLSLE_LDST32_TPREL_LO12_NC;
 261       break;
 262     case AArch64::fixup_a64_ldst64_tprel_lo12:
 263       Type = ELF::R_AARCH64_TLSLE_LDST64_TPREL_LO12;
 264       break;
 265     case AArch64::fixup_a64_ldst64_tprel_lo12_nc:
 266       Type = ELF::R_AARCH64_TLSLE_LDST64_TPREL_LO12_NC;
 267       break;
 268
 269     // TLS general-dynamic block
 270     case AArch64::fixup_a64_tlsdesc_adr_page:
 271       Type = ELF::R_AARCH64_TLSDESC_ADR_PAGE;
 272       break;
 273     case AArch64::fixup_a64_tlsdesc_ld64_lo12_nc:
 274       Type = ELF::R_AARCH64_TLSDESC_LD64_LO12_NC;
 275       break;
 276     case AArch64::fixup_a64_tlsdesc_add_lo12_nc:
 277       Type = ELF::R_AARCH64_TLSDESC_ADD_LO12_NC;
 278       break;
 279     case AArch64::fixup_a64_tlsdesc_call:
 280       Type = ELF::R_AARCH64_TLSDESC_CALL;
 281       break;
 282     }
 283   }
 284
 285   return Type;
 286 }
 287
 288 MCObjectWriter *llvm::createAArch64ELFObjectWriter(raw_ostream &OS,
 289                                                    uint8_t OSABI) {
 290   MCELFObjectTargetWriter *MOTW = new AArch64ELFObjectWriter(OSABI);
 291   return createELFObjectWriter(MOTW, OS,  /*IsLittleEndian=*/true);
 292 }